JPH09245972A - High magnetic field lighting device, high magnetic field lighting fixture, and high magnetic field lighting system - Google Patents

Abstract

(57) An object of the present invention is to provide a high magnetic field lighting device capable of stably lighting a lamp even in a high magnetic field and free from stress due to the influence of a magnetic field. A fluorescent lamp 1 as a light source is arranged in a magnetic field of 30 G or more formed by a magnetic generation source X.
The lighting device 2 including the power supply device 2b and the ballast 2a,
The voltage applied to the fluorescent lamp 1 is alternated at 400 Hz or higher. By alternating the applied voltage at 400 Hz or more, even if the arc tries to vibrate due to the Lorentz force due to the interaction with the magnetic field, the arc cannot follow the change in the direction of the Lorentz force, and as a result, the arc becomes stationary. To be kept. As a result, the fluorescent lamp 1 can be stably turned on even in a magnetic field of 30 G or more.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting device used in a magnetic field having a relatively high magnetic field strength.

[0002]

2. Description of the Related Art Generally, a magnetic field in the natural world has a magnetic flux density of 0.1 mT (1 G) or less, but in a laboratory or a factory, there is an environment where a magnetic field having a magnetic flux density of 30 G or more acts. For example, in researching nuclear fusion, it is necessary to confine high-temperature plasma to satisfy critical plasma conditions and Lawson conditions, and there is a magnetic confinement method as a method for confining high-temperature plasma. In order to realize such a magnetic confinement method, it is necessary to form a strong magnetic field using a superconducting coil, so that the magnetic flux density should be 30 G or more even in a space where humans can enter due to leakage flux. A high magnetic field environment will be created.

Even in the environment where a strong magnetic field acts as described above, lighting is required to confirm the surrounding conditions in a space where a person can enter, and lighting using an electric light source is generally performed. That is, it is required to stably turn on the electric light source even in a high magnetic field environment. by the way,
Japanese Patent Application Laid-Open No. 56-97906 discloses that an electric light source is turned on in a magnetic field stronger than a magnetic field existing in nature.
As described in JP-A-56-97964, a magnet is provided along a discharge path of a low-pressure discharge lamp that is lit by applying an alternating voltage of a relatively low frequency such as a commercial power supply frequency. It is known to place. The magnet described in the above publication forms a static magnetic field in the direction intersecting the discharge path. In the publication, the dark part having a high ionization degree is fixed to suppress the flicker, and the starting characteristics in a low temperature environment The effect such as improving is described. Such an effect of improving the characteristics of a fluorescent lamp by a static magnetic field is described in “Wada Seiji et al .: Magnetic field application effect to fluorescent lamps and its applicability, National Convention of Lighting Society (1985), pp2.
15 ”.

Further, in order to prevent the central portion of the arc formed horizontally in the high pressure discharge lamp from being bent by the buoyancy due to the convection inside the discharge lamp, the magnetic field is applied so that the Lorentz force acts in the direction to cancel the buoyancy. The structure which formed the is described. This magnetic field is formed by Helmholtz coils, and the high-pressure discharge lamp is arranged between the Helmholtz coils. Further, the current passed through the Helm-Whitz coil is alternated in synchronization with the polarity of the voltage applied to the high pressure discharge lamp. In this configuration, the Lorentz force generated by the magnetic field balances the direction and magnitude of the buoyancy inside the high-pressure discharge lamp with the change in the direction and strength of the magnetic field so that the Lorentz force is balanced with the buoyancy generated inside the high-pressure discharge lamp. I will let you. Then, if you suppress the bending of the arc,
It is possible to suppress an increase in the lamp voltage and prevent damage to the tube wall due to local overheating.

[0005]

As described above, in the former configuration in which a static magnetic field is applied to a low-pressure discharge lamp that is lit by applying an alternating voltage in a direction intersecting the discharge path, the arc is used. Can be stabilized and flicker can be reduced. Further, in the latter configuration, it is possible to prevent the arc from bending by applying an alternating magnetic field synchronized with the alternating waveform of the lighting voltage to the high pressure discharge lamp.

However, these configurations are intended to improve the lighting state of the lamp by positively utilizing the magnetic field, and in the high magnetic field environment such as in the laboratory or factory as described above, the strength and direction of the magnetic field. Since it is difficult to adapt the lamp to the lamp, there are problems that the lighting state of the lamp becomes unstable and the life of the lamp and the lighting device is affected. In particular, when the discharge lamp is lit by a commercial power source, the direction and magnitude of the Lorentz force acting on the arc change with time due to the interaction between the magnetic field and the arc, so the movement of the arc causes flickering or arc bending. This causes an increase in the lamp voltage and a local overheating of the tube wall. If the lamp voltage rises, the stress on the lighting device that supplies power to the lamp increases and the lighting device is easily damaged. Further, even in the case of an incandescent light bulb, the Lorentz force acts on the filament to vibrate the filament, and stress is applied to the filament, resulting in a problem that the life is shortened.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a high magnetic field lighting device capable of stably lighting a lamp even in a high magnetic field and free from stress due to the influence of a magnetic field. In addition, it provides a high magnetic field lighting fixture that is not easily affected by the magnetic field even though the lamp and the lighting device are provided in one fixture main body, and also stably lights a plurality of lamps arranged in a high magnetic field. An object of the present invention is to provide a high magnetic field illumination system that performs centralized control so as to enable the above.

[0008]

Claims 1 and 2
A second aspect of the present invention relates to a high magnetic field illumination device, and the invention of claim 1 is an illumination device in which a light source is arranged in a magnetic field of 30 G or more, wherein a discharge lamp as a light source and a voltage applied to the discharge lamp are 400 Hz. It is characterized in that it is provided with a lighting device that alternates as described above.

Generally, when an alternating voltage is applied to the discharge lamp, the arc tends to vibrate due to the Lorentz force due to the interaction with the magnetic field. The arc can no longer follow, and as a result, the arc is kept stationary. That is, the discharge lamp can be stably turned on even in a magnetic field of 30 G or more. Although it depends on the type of the discharge lamp, by lighting the discharge lamp under this condition, it was possible to light the lamp even at 2000 G or more without causing flicker.

According to the invention of claim 2, in the invention of claim 1, the lighting device applies a voltage of 20 kHz to the discharge lamp.
The above feature is characterized by alternation. In this configuration, 3
Not only can the arc be stopped in a magnetic field of 0 G or more to stably turn on the discharge lamp, but noise is reduced because the alternating frequency is higher than the audible frequency. Further, if the frequency becomes high, a small inductor can be used, so that it can be made smaller and lighter, and moreover, the ions disappear when the polarity of the voltage applied to the discharge lamp is reversed. Since the voltage is applied before and there is no re-ignition, the power consumption is reduced.

According to a third aspect of the invention, in the second aspect of the invention, the discharge lamp is a low-pressure discharge lamp, and the lighting device is capable of adjusting the power supplied to the discharge lamp. Generally, when a discharge lamp is used in a magnetic field, the arc is deformed by the Lorentz force due to the interaction between the arc and the magnetic field, the arc length is extended, and the lamp voltage is increased.
If the configuration of claim 3 is adopted, it is possible to reduce the power supplied to the discharge lamp in a state where the lamp voltage rises, and it is possible to suppress the rise of the lamp voltage. In other words, if the lamp voltage rises while the lamp current is kept constant, the input power will increase and the stress on the lighting device will increase.However, the dimmable control can suppress the lamp voltage rise. , It is possible to reduce the stress of the lighting device and prevent the breakdown and the damage.

According to the invention of claim 4, in the invention of claim 2, the discharge lamp is a low-pressure discharge lamp for high frequency lighting. This configuration is a preferred embodiment of the invention of claim 2, in which the voltage applied to the discharge lamp is 20 k.
When alternation is performed at a frequency of Hz or higher, the power loss is reduced by using a discharge lamp for high frequency lighting.

According to a fifth aspect of the present invention, in the first aspect of the present invention, the discharge lamp is a high pressure discharge lamp, and in the lighting device, the frequency at which the voltage applied to the discharge lamp is alternating is set to be equal to or lower than the acoustic resonance frequency. It is characterized by Generally, in a high-pressure discharge lamp, an acoustic resonance phenomenon occurs when the frequency at which the applied voltage alternates becomes high.Therefore, by setting the alternating frequency of the applied voltage below the acoustic resonance frequency according to the specifications of the high-pressure discharge lamp, the acoustic resonance It is possible to suppress the occurrence of the phenomenon. As a result, it is possible to prevent flickering of the light output and breakage of the arc tube.

According to a sixth aspect of the invention, in the third aspect of the invention, the lighting device is a separately excited control type high frequency lighting device, which is a separately excited control type high frequency lighting device. . With this configuration, since it is a separately excited control type, dimming control by applying an external signal becomes possible.

According to a seventh aspect of the present invention, there is provided a lighting device in which a light source is arranged in a magnetic field of 30 G or more, and a discharge lamp as a light source and an upper limit to which an output when the discharge lamp is arranged in a magnetic field is allowed. And a lighting device in which the output to the discharge lamp is set so as to be less than or equal to the value. In general, the lamp power of a discharge lamp rises in a magnetic field, so if the rated output is set in a normal environment, it will be overloaded in the magnetic field. Therefore, if the output to the discharge lamp is set so that the output when the discharge lamp is placed in the magnetic field is below the allowable upper limit value, the lamp voltage will not become excessive and the discharge lamp will be destroyed. Can be prevented. Further, the fact that the lamp voltage in the magnetic field becomes equal to or lower than the allowable upper limit value gives power smaller than the rated power in the normal environment.

According to an eighth aspect of the present invention, there is provided an illuminating device in which a light source is arranged in a magnetic field of 30 G or more, which comprises a discharge lamp as a light source and a lighting device which makes a voltage applied to the discharge lamp a direct current. Is characterized by. In this configuration, if the magnetic field in the space in which the discharge lamp is placed is a steady magnetic field whose direction and magnitude do not change, the direction and magnitude of the Lorentz force acting on the arc do not change, so the arc vibrates. Flickering does not occur, and it is possible to turn on stably.

According to a ninth aspect of the invention, in the eighth aspect of the invention, the lighting device inverts the polarity of the voltage applied to the discharge lamp at a predetermined cycle, and the above-mentioned cycle causes a change in the light output due to the polarity inversion as flicker. The feature is that it is set so long as not to be perceived. Generally, there is known a phenomenon called catalysis in which mercury or the like in the discharge lamp becomes unevenly distributed when the discharge lamp is lit by direct current, resulting in uneven light output. In addition, in the case of direct current lighting, the consumption of the electrodes is unevenly distributed, which may shorten the life of the discharge lamp. Therefore, in the invention of claim 9, when the discharge lamp is lit by direct current, the polarity is inverted at every predetermined time, so that the occurrence of catalysis can be suppressed. Here, the cycle of reversing the polarity is determined by the specifications (particularly the shape) of the discharge lamp and the ambient temperature, and is generally set in the range of 1 minute or more and 1 hour or less. For example, if it is set to 10 minutes, the polarity will be inverted every 5 minutes, and if it is at this level, it will not be perceived as flicker, so there will be no discomfort. Further, if the polarity is reversed in about 1 hour, catalysis does not proceed sufficiently and the uneven consumption of the electrodes is small, so that the adverse effect of direct current lighting is reduced.

According to a tenth aspect of the present invention, there is provided an illuminating device in which the light source is arranged in a magnetic field of 30 G or more, and an incandescent lamp is provided as the light source. According to this configuration, the incandescent light bulb is used in the magnetic field, and when the incandescent light bulb is turned on by the commercial power source, it is possible to stably turn on the light even if the magnetic flux density is 200 G or more.

An eleventh aspect of the present invention is an illuminating device in which a light source is arranged in a magnetic field of 30 G or more, and is provided with an incandescent light bulb having a seismic strengthened filament as a light source. Generally, an incandescent light bulb can be stably lit even when the magnetic flux density is 200 G or more, but when lit with a commercial power source, the Lorentz force due to the interaction between the current flowing in the filament and the magnetic field is at the frequency of the commercial power source. Since it vibrates, when the magnetic field strength increases, the filament may be deteriorated by the vibration. On the other hand, in the invention of claim 11, since the vibration-proof filament is used, the vibration of the filament is suppressed, and the filament can be stably lit even when the magnetic field strength becomes considerably large.

A twelfth aspect of the present invention is an illuminating device in which a light source is arranged in a magnetic field of 30 G or more, and includes an incandescent light bulb as a light source and a lighting device for alternating an applied voltage to the incandescent light bulb at 400 Hz or more. It is characterized by being provided. In this configuration, like the arc of the discharge lamp, the Lorentz force acting on the filament alternates at 400 Hz or more, so that the filament cannot follow, and as a result, the filament becomes stationary at a fixed position. That is, vibration does not occur in the filament and deterioration is prevented. In addition,
Since the filament has a natural frequency determined by the material and shape, it is necessary to set the alternating frequency of the lamp voltage so that the vibration frequency of the Lorentz force does not match the natural frequency.

A thirteenth aspect of the present invention is an illuminating device in which a light source is arranged in a magnetic field of 30 G or more, and comprises an incandescent light bulb as a light source and a lighting device for applying a DC voltage to the incandescent light bulb. Is characterized by. In this configuration, if the magnetic field does not change the direction and strength by turning on the incandescent lamp with direct current, the direction and strength of the Lorentz force acting on the filament do not change, so the plastic deformation does not occur in the filament. Within the range, even if the magnetic field strength becomes considerably large, the filament can be stably lit without deterioration.

According to a fourteenth aspect of the present invention, there is provided a lighting device in which a light source is arranged in a magnetic field of 30 G or more, and a lighting device having a control unit for controlling output to the lamp according to an external signal, and the lighting device. And a power detection unit that gives an external signal to the control unit according to a change in the lamp power due to the action of the magnetic field. According to this configuration, the power detection unit generates an external signal according to the change in the lamp power due to the action of the magnetic field, and the output to the lamp is controlled by inputting the external signal to the control unit. It is possible to suppress the change in the lamp power due to. In other words, if the control is performed so as to suppress the increase in lamp power due to the influence of the magnetic field, the decrease in the lamp life due to the increase in lamp power, and
It is possible to reduce stress on the lighting device due to an increase in power supplied to the lamp.

According to a fifteenth aspect of the present invention, in the fourteenth aspect of the present invention, the power detector detects the output power to the lamp,
The control unit controls the output so that the output power detected by the power detection unit is kept substantially constant. With this configuration, since the output power to the lamp is kept substantially constant, the lamp power is not increased by the action of the magnetic field, and the stress on the lamp due to the influence of the magnetic field is prevented. That is, the life of the lamp is reduced.

According to a sixteenth aspect of the present invention, in the fourteenth aspect of the present invention, the power detection section detects the input power, and the control section controls the output so that the input power detected by the power detection section is kept substantially constant. Is characterized by. With this configuration, since the input power to the lighting device is kept substantially constant, an increase in the input power to the lighting device due to the action of the magnetic field is suppressed, and stress on the lighting device is prevented. In other words, deterioration or destruction of the lighting device is prevented, and moreover, if the input power to the lighting device is not increased, the output power to the lamp is not increased, so that the stress on the lamp is reduced.

According to a seventeenth aspect of the present invention, there is provided a lighting device in which a light source is arranged in a magnetic field of 30 G or more, and a lighting device having a control unit for controlling output to the lamp according to an external signal, and at least the lamp. A magnetic sensor that detects the ambient magnetic field of the device, and an external signal generator that gives an external signal to the controller when the magnetic field strength detected by the magnetic sensor becomes larger than the normal environment so that the output power is equal to or lower than the output power in the normal environment. It is characterized by

According to this structure, at least the ambient magnetic field of the lamp is detected by using the magnetic sensor, and the electric power according to the ambient magnetic field is supplied to the lamp. Here, the output power to the lamp when the lamp is present in the magnetic field is set to be equal to or lower than the output power in the normal environment, so the lamp power of the lamp placed in the magnetic field should be equal to the normal environment or As a result, the increase in lamp power in the magnetic field can be suppressed. That is, the stress on the lamp is reduced and the stress on the lighting device is also reduced.

The invention of claim 18 is an illuminating device in which a discharge lamp as a light source is arranged in a magnetic field of 30 G or more, and the detected value of at least one of the input and the output of the discharge lamp is compared with a reference level. And a lighting device whose output is controlled in a direction to reduce the output power to the discharge lamp when the abnormality detecting unit detects the abnormality of the discharge lamp. And

In this structure, the input or output of the discharge lamp is compared with the reference level, and when an abnormality in the discharge lamp is detected, the output power is controlled so as to reduce the output power to the discharge lamp. For example, at the end of life. By detecting the Emiles state (half-wave discharge state) that occurs in 1) and reducing the output, it is possible to prevent the lighting device from being destroyed by an excessive current in the Emiles state. In particular, since the lamp power increases in a magnetic field more than in a normal environment, it is essential to have a function of preventing damage to the lighting device by providing a protection function against abnormalities. Here, to reduce the output power to the discharge lamp means to reduce the output power to the extent that the discharge lamp or the lighting device is not destroyed, and to stop the output to the discharge lamp or intermittently to the discharge lamp. Including the power supply, especially when the power is supplied intermittently, it is possible to provide a function of notifying an abnormality by blinking the discharge lamp.

According to a nineteenth aspect of the present invention, in the eighteenth aspect of the present invention, at least the magnetic sensor for detecting the magnetic field around the discharge lamp and the increase in the lamp voltage from the normal environment based on the magnetic field intensity detected by the magnetic sensor are used. And a reference level setting unit that sets a reference level so as to cancel each other. In this configuration, at least the magnetic field around the discharge lamp is detected by the magnetic sensor, and the reference level is set so as to cancel out the increase in the lamp voltage due to the effect of the magnetic field. However, the relative difference with the reference level hardly changes, and the level difference between the lamp voltage and the reference level occurs only when an abnormality occurs, so that it can be detected as an abnormality. That is, it is possible to easily distinguish whether the increase in the lamp voltage is normal due to the influence of the magnetic field or abnormal due to the end of the lamp life.

According to a twentieth aspect of the present invention, in the eighteenth aspect of the present invention, the lighting device includes a control section for controlling output according to an external signal, and the abnormality detecting means has a detection value before reaching a reference level higher than that in a normal environment. It is characterized in that an external signal for making the output power equal to or lower than the output power in a normal environment is given to the control unit when the output power becomes large. With this configuration, an abnormality of the discharge lamp such as at the end of the life of the discharge lamp can be detected as an abnormality by the detected value of the input or output of the discharge lamp reaching the reference level. Further, since the detected value reflects the influence of the ambient magnetic field of the discharge lamp when the discharge lamp is normally lit, the ambient magnetic field is estimated from the detected value and output control is performed according to the ambient magnetic field. Of. Here, if the detected value becomes larger than the normal environment, it means that the ambient magnetic field becomes large.Therefore, when the detected value rises, the output power is set to be the same as or smaller than the normal environment. The stress can be reduced. Further, if the stress of the discharge lamp is reduced, the stress of the lighting device is also reduced.

According to a twenty-first aspect of the present invention, there is provided a lighting device including a lighting device arranged in a magnetic field of 30 G or more, wherein the lighting device is provided with a magnetic shield.
In this configuration, since the lighting device is magnetically shielded, there is almost no influence of the magnetic field on the lighting device, and abnormal operation of the lighting device can be prevented. Claim 22
The present invention is characterized by including at least one electromagnetic component around which a coil is wound, a lighting device arranged in a magnetic field of 30 G or more, and the electromagnetic component being magnetically shielded.

In this structure, since the magnetic shield is applied to the electromagnetic parts which are particularly susceptible to the magnetic field in the lighting device, abnormal operation due to the effect of the magnetic field is prevented.
The invention of claim 23 relates to a lighting fixture for high magnetic field, comprising 30G
A lighting fixture arranged in the above magnetic field, characterized in that the lamp and the lighting device are mounted on one fixture main body, and a part of the fixture main body constitutes at least a magnetic shield of the lighting device.

In this structure, since the lamp and the lighting device are provided in the main body of the fixture, the lighting device is also placed in the magnetic field by disposing the lamp in the magnetic field. Since the magnetic shield is provided by a part of the above, the influence of the magnetic field on the lighting device is reduced and abnormal operation does not occur. The invention according to claim 24 relates to a high magnetic field illumination system, wherein a plurality of lamps arranged in a magnetic field of 30 G or more, a plurality of lighting devices for supplying power to the respective lamps, and a magnetic field detection for detecting an ambient magnetic field of each lamp. Means and a management device for centrally controlling the output from the lighting device to each lamp so as to reduce the influence of the ambient magnetic field detected by the magnetic field detection means.

With this configuration, a plurality of lamps arranged in the magnetic field can be centrally managed by the management device, and the management device controls the output from the lighting device to the lamp so as to reduce the influence of the ambient magnetic field of each lamp. Since it controls, the ambient magnetic field of each lamp is detected by the magnetic field detection means, and the management device controls the lighting device based on the detected magnetic field, so that even if a large number of lamps are arranged in the magnetic field,
The output to each lamp can be controlled appropriately.

[0035]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In general, the components for performing electric illumination are a lamp serving as a light source, a lighting device for controlling power supply to the lamp, and a device for controlling distribution of light emitted from the lamp. In the main body, the lighting device is powered by a commercial power source or a battery. In a general electric lighting device, a discharge lamp and an incandescent lamp are mainly used as a lamp. The discharge lamp includes a low-pressure discharge lamp such as a fluorescent lamp and a high-pressure discharge lamp (HID lamp) such as a mercury lamp, a sodium lamp, and a metal halide lamp.

By the way, in the discharge lamp, since the light output is obtained by forming an arc, the influence of the magnetic field on the arc becomes a problem. That is, when the arc is generated in the magnetic field, the Lorentz force acts on the arc due to the interaction between the magnetic field and the arc, and the arc is deformed. If the arc is deformed, the lamp voltage rises, the lamp power increases, the lamp overheats, and the lamp may be damaged. Further, since the arc is deformed, the arc approaches the tube wall, so that the ions are easily extinguished, and the lighting maintaining voltage for maintaining the arc rises, so that the arc easily extinguishes. Furthermore, when the discharge lamp is lit with a commercial power source, the polarity of the voltage applied to the discharge lamp alternates at a relatively low frequency, so re-ignition is repeated during the operation of the lamp. As the voltage rises, the re-ignition voltage also rises, so that power consumption increases and flicker easily occurs. In addition, if the lamp current is maintained when the lamp voltage rises, the lamp power will increase,
The input power to the lighting device increases, resulting in increased stress on the lighting device, and in some cases, the lighting device may be damaged.

On the other hand, in the incandescent light bulb, since the light output is obtained by incandescently heating the filament by energizing the filament, the influence of the magnetic field on the filament becomes a problem. That is, the Lorentz force acts on the filament due to the interaction between the current flowing through the filament and the magnetic field. Here, even if the filament is deformed a little due to Lorentz force, the light emission center only moves slightly, and there is almost no effect on the lamp voltage or light output. Since the direction of the filament changes with the passage of time, the filament is subjected to forced vibration due to the Lorentz force. When subjected to such forced vibration, the filament vibrates and receives mechanical stress, and the filament is likely to break, shortening the life of the incandescent light bulb.

As described above, since the phenomenon caused by the influence of the magnetic field is different between the discharge lamp and the incandescent lamp, each case will be described below. (Embodiment 1) In this embodiment, a case where a fluorescent lamp 1a as a low pressure discharge lamp is used will be described. As shown in FIG. 1, the fluorescent lamp 1a is arranged in the magnetic field formed by the magnetic source X, and the lighting device 2 is composed of a so-called copper-iron type ballast 2a such as a choke coil and a power supply device 2b. It is located in a place that is not affected by the magnetic field. The power supply device 2b is configured to output an alternating voltage and have an output frequency of 400 Hz or higher. Also,
The ballast 2a is configured according to the output frequency of the power supply device 2b.

According to this structure, the Lorentz force, which is an interaction with the magnetic field, acts on the arc formed when the fluorescent lamp 1a is lit, so that the arc tends to vibrate.
As described above, the applied voltage to the fluorescent lamp 1a is 400 Hz.
By making the alternation as described above (hereinafter, the alternating frequency of the voltage applied to the lamp is referred to as the lighting frequency), the arc cannot vibrate following the change of the Lorentz force, resulting in the arc vibration. Can be suppressed. Here, as described above, since the lighting state of the fluorescent lamp 1a is affected by the Lorentz force acting on the arc, the influence on the lighting state differs depending on the arrangement of the fluorescent lamp 1a with respect to the direction of the magnetic field. , Fluorescent lamp 1 so that the lighting state is most strongly affected by the magnetic field
The fluorescent lamp 1a is set so as to be stably turned on even when a is arranged. The lighting frequency is 40
If the fluorescent lamp 1a is lit by applying an alternating voltage of 0 Hz or more, the vibration of the arc is suppressed as described above, the rise of the lighting maintaining voltage is suppressed and the flicker is reduced, and moreover, during lighting. It is difficult to disappear because it does not repeat re-ignition.

In order to prevent noise from the lighting device 2, the output frequency of the power supply device 2b is preferably set higher than the audible frequency, more preferably 20 kHz or higher. Thus, when the lighting frequency is set to 20 kHz or higher, it is desirable to use the fluorescent lamp 1a for high frequency lighting in terms of efficiency. That is, the fluorescent lamp 1a for high-frequency lighting is designed to have high efficiency in high-frequency lighting, and when the lighting frequency is 20 kHz or higher, this type of fluorescent lamp 1a.
The efficiency is further increased by using a.

The lighting device 2 can be composed of the power supply device 2b having an output frequency of about 400 Hz and the copper-iron type ballast 2a if the lighting frequency is about 400 Hz. Is 20 kHz or more, a power source device 2b that outputs a DC voltage (including a pulsating current voltage obtained by rectifying an AC voltage) is used, and the ballast 2
An electronic (inverter) type is used as a.

Also in this example, when the magnetic field strength acting on the fluorescent lamp 1a is increased, the Lorentz force is increased, so that the amplitude of the arc becomes conspicuous, and when the arc is deformed, the lamp voltage is increased. Become. In addition, the fluorescent lamp 1a is arranged so that the arc becomes horizontal.
In case of arranging, the buoyancy acts on the arc and the central part bends upward. Although the arc is deformed by the magnitude of the magnetic field and the buoyancy acting on the arc as described above, by adopting this embodiment, the fluorescent lamp 1a can be used even in a magnetic field in which the magnetic flux density is 1000 G or more.
Can be turned on stably.

The operating characteristics when the lighting conditions of the fluorescent lamp 1a are changed are shown below. However, in the following description, as in the configuration example shown in FIG. 1, the lighting device 2 is arranged in a place where there is no influence of the magnetic field, and the luminous flux is measured by an illuminometer arranged opposite to the fluorescent lamp 1a to determine the lamp voltage. The lamp current is measured in a place where there is no magnetic field. Further, the lamp power is obtained as the product of the lamp voltage and the lamp current.

FIG. 2 shows a 36 W twin fluorescent lamp (product number:
FPL36X) is lit at 50 Hz (ballast is copper-iron type, power is supplied from a commercial power source without using a power supply device),
(A) shows the relationship between the magnetic flux density and the lamp power ratio and the luminous flux ratio (the solid line shows the lamp power ratio and the broken line shows the luminous flux ratio. The same applies to the following figures), and the same figure (b) shows the magnetic flux density and the lamp voltage. It shows the relationship with the ratio. Under this condition, no arc was observed up to 422G, flicker occurred at 555G, and disappeared at 713G. Also, although it started at 544G, it did not start at 788G. FIG.
According to (a), it is understood that the lamp power ratio and the luminous flux ratio start to decrease when the magnetic flux density exceeds 400G. Further, according to FIG. 2B, it is understood that the lamp voltage increases by about 30% at about 350G. Therefore, in the case of lighting at 50 Hz, the usage limit is about 400G.

FIG. 3 shows the relationship between the magnetic flux density, the input power ratio, and the luminous flux ratio when the fluorescent lamp is turned on at 40 kHz. Here, the input power ratio relates to the input power of the lighting device 2, but is substantially equal to the lamp power ratio. As is apparent from FIG. 3, the lamp power increases with an increase in the magnetic flux density.
It can be said that it can be used even at 00G or more.

Further, as the fluorescent lamp 1a, a rapid start type straight tube type (product number: FLR40SW / M-
X.36) and lit at 400Hz,
There was no abnormality in the arc up to 1327G, and disappearance occurred at 2430G. However, although the luminous flux increased up to 728G, the luminous flux decreased at 1327G. Fluorescent lamp 1a for high frequency lighting (product number: FHF3
2EX-N) was used and the lamp was turned on at 40 kHz, no abnormality was found in the arc up to 1817G. Further, even with 1817G, the increase in lamp power was about 40%.

From the above measurement results, if an alternating voltage of 400 Hz or more is applied to the fluorescent lamp 1a, the fluorescent lamp 1
It has been confirmed that regardless of the type of a, it can be stably lit in a magnetic field of 1000 G or more, and the lighting characteristics in the magnetic field are improved as compared with the case of lighting with a commercial power source (50 Hz). (Embodiment 2) This embodiment is a high pressure discharge lamp (HID
(A lamp) is arranged in a magnetic field, and the configuration is such that the fluorescent lamp 1a in the first embodiment is replaced with an HID lamp. The power supply device 2b has an output frequency of 400H.
An output voltage that alternates at z or higher is used. Even with this configuration, a tendency similar to that of the fluorescent lamp 1b is obtained,
As compared with the case of lighting at a low frequency (for example, 50 Hz), fading and flicker in a magnetic field are reduced. However, as will be described later, the magnetic flux density is 1 in the fluorescent lamp 1a.
It was possible to steadily light up even in a magnetic field of 000G or more, whereas with an ordinary HID lamp, 200G
The degree of use (some specifications can be used even in a magnetic field with a higher magnetic flux density) is the limit of use. Further, the fluorescent lamp 1b could be turned on at a frequency of 20 kHz or higher, but the HID lamp could operate at several kHz to hundreds of tens of kHz.
It is known that an acoustic resonance phenomenon occurs in the frequency range of Hz, and if this phenomenon occurs, it may disappear and the arc tube may explode, so the output frequency of the lighting device 2 is the frequency at which the acoustic resonance phenomenon occurs. It is set lower than (acoustic resonance frequency).

The operating characteristics when the lighting conditions of the HID lamp are changed are shown below. Also, like the fluorescent lamp 1a,
The lighting device 2 is arranged in a place where there is no influence of the magnetic field, and the luminous flux is measured by an illuminometer arranged opposite to the HID lamp.
The lamp voltage and lamp current are measured in a place where there is no magnetic field. Further, the lamp power is obtained as the product of the lamp voltage and the lamp current. The fluorescent lamp 1a can be used even if the lamp voltage rises by about 50%.
In the ID lamp, if the lamp voltage rises by about 20%, the usage limit will be reached.

FIG. 4 shows a case where a 360 W high-pressure sodium lamp (product number: NH360L) is arranged so that an arc is formed in a vertical direction and is lit at 50 Hz (a ballast is a copper-iron type, a commercial power source is used without using a power supply device). Power supply)
(A) shows the relationship between the magnetic flux density, the lamp power ratio, and the luminous flux ratio, and (b) shows the relationship between the magnetic flux density and the lamp voltage ratio. Under this condition, no abnormal arc was observed up to 20G, and flicker occurred at 34.4G.
It disappeared at 64.4G. According to FIG. 4A, it can be seen that the lamp power ratio greatly decreases when the magnetic flux density exceeds 120 G, and the luminous flux ratio greatly decreases when the magnetic flux density exceeds 40 G. Further, according to FIG. 4 (b), it can be seen that the lamp voltage greatly rises above 120G. Therefore,
For lighting at 50 Hz, the usage limit is around 40G.

FIG. 5 shows a case where the lamp is arranged so that an arc is formed in a horizontal direction and is lit at 50 Hz. Under this condition, some flicker occurs at 24.4G and disappears at 166.7G.
Also, I could not start at 315.6G. The lamp power ratio, the luminous flux ratio, and the lamp voltage show the same tendency as when the arc is formed in the vertical direction. 6 shows a case where a 400W metal halide lamp (product number: M400L / BU-5C) is arranged so that an arc is formed in the vertical direction, and FIG. 7 shows a case where the lamp is arranged so that an arc is formed in the horizontal direction. And the lighting frequency is set to 50 Hz. In both cases, no abnormality was found in the arc up to 35.6 G, and it disappeared at 122.2 G in the vertical arrangement and at 174.4 G in the horizontal arrangement. That is, according to FIG. 6 and FIG. 7, the metal halide lamp is connected to the commercial power source (50H).
For lighting in z), the upper limit of usage is about 70G.

A compact and high color rendering metal halide lamp of 150 W (product number: HQI-TS150W / NDL) is 50H.
When the light was turned on at z, the result as shown in FIG. 8 was obtained. In this case, there is no abnormal arc up to 31.1G.
It disappeared at 02.2G. According to FIG. 8, it can be seen that the upper limit of use of this lamp is about 70G. FIG. 9 shows the operating characteristics when a 250 W short arc metal halide lamp (metal halide lamp with a short electrode distance) is lit at 120 Hz. The lighting waveform was an alternating rectangular wave. Here, a DC power supply is used for the power supply device 2b and an electronic ballast is used for the ballast 2a. In this case, there is no abnormal arc up to 143.3G, and 160G
Then, the arc started to shake. Also, 566.7G
Then it disappeared. As is clear from FIG. 9, 380
It can be seen that up to about G can be used. It is considered that this is because the lighting frequency is set higher than that of the commercial power source and the arc is shorter than that of other metal halide lamps.

In addition to the above HID lamps, 100W metal halide lamps (product number: M100L / BU), 10
0W ballastless mercury lamp (Part number: BH200-220
V-100W-C), 100W transparent mercury lamp (product number:
For H100), the operating states at 50 Hz and 400 Hz were confirmed. As a result, at 50 Hz, 64G, 0G, and 0G were able to light without any abnormality, and the arc swelled at 82G, 64G, and 64G.
The electrode spot became unstable. It also disappeared at 273G, 229G, and 229G, respectively. On the other hand, when lighting at 400 Hz, 8
No abnormality up to 2G, 192G, 82G, 192G, 2
The arc bends and shakes at 73G and 192G, and disappears at 796G, 2093G, and 487G, respectively.

From the above results, at least 5 in the magnetic field.
It is more stable to light at 400 Hz than to light at 0 Hz, and the upper limit of usage is about 70 G at 50 Hz, whereas the upper limit of usage is about 200 G for most HID lamps at 400 Hz. There is. In particular, it was confirmed that the ballastless mercury lamp can be used up to about 300G.

(Embodiment 3) As described above, since there is a problem that the arc fluctuates when the discharge lamp is lit by the commercial power source, a power source device 2b of the lighting device 2 that outputs a DC voltage is used. be able to. If a DC voltage is applied to the discharge lamp, the arc will not move with time even if it is deformed unless the direction of the magnetic field changes, so flickering and extinguishing may occur even if it is lit in the magnetic field. Absent.

However, when the discharge lamp is turned on by direct current, mercury or the like in the discharge lamp is unevenly distributed, and the light output is unevenly distributed. Such a phenomenon is called catalysis and must be avoided. Further, when the discharge lamp is lit by direct current, electrons are emitted from only one electrode, so that only the electrode that emits electrons is consumed and the life is shortened. In order to avoid this problem, it is possible to use a discharge lamp for direct current lighting, but since it is a special product, it is expensive, difficult to obtain, and inconvenient for maintenance.

Therefore, in order to avoid catalysis and shorten the service life, it is desirable to invert the polarity at some time while using a normal discharge lamp. That is, by reversing the polarity every 1 minute to 1 hour, the problem of direct current lighting can be avoided and a normal discharge lamp for alternating current lighting can be used. If the cycle of reversing the polarity of the lamp voltage is set to 1 minute or less, the fluctuation of the light output at the time of reversing the polarity of the lamp voltage is easily perceived, and if it is 1 hour or more, catalysis progresses, which is inconvenient. How much time is set from 1 minute to 1 hour is determined by the shape of the discharge lamp, the progressing rate of catalysis, the ambient temperature, and the like.

In the first to third embodiments, a stationary magnetic field in which the direction and magnitude of the magnetic field are constant is assumed, but the first and second embodiments are assumed.
The configuration can employ the above-described configuration even if the magnetic field has a direction and a magnitude that change with time, as long as the change in the magnetic field is not synchronized with the output voltage of the lighting device 2. . For example, by using each of the above examples in a magnetic field whose direction and size change over time, such as the magnetic field formed by a superconducting coil used in nuclear fusion research, the lamp can be stabilized. Can be turned on. However, since the upper limit of usable magnetic flux density differs depending on the type and specifications of the lamp, it is necessary to select the type and specifications of the lamp according to the magnetic flux density at the location.

(Embodiment 4) This embodiment is an example in which an incandescent light bulb is arranged in a magnetic field, and as shown in FIG. 10, an incandescent light bulb 1b is provided in a space where a magnetic field is formed by a magnetic source X.
Is arranged. The lighting device 2 is a commercial power source, a transformer for stepping down or boosting a commercial power source voltage, or an electronic transformer (including an inverter or a chopper circuit) for converting frequency or voltage, and is placed in a place not affected by a magnetic field. Will be placed. The lighting device 2 outputs an alternating voltage. Here, the lighting device 2 is arranged in a place where it is not affected by the magnetic field in order to prevent the operations of the components forming the lighting device 2 from being affected by the magnetic field. In particular, when the lighting device 2 includes an electromagnetic device such as a transformer, the lighting device 2 is likely to be affected by the magnetic field, and therefore the lighting device 2 needs to be arranged in a place where the magnetic field is not affected.

As described above, when an alternating voltage is applied to the incandescent lamp 1b, the magnitude and direction of the Lorentz force acting on the filament changes with time, but since the filament is less likely to be deformed than an arc, a relatively large Lorentz force is applied. Vibration does not occur even if applied. In other words, in the incandescent light bulb 1b, even if the lighting device 2 is not used, the vibration of the filament has almost no effect on the service life up to about 400 G, and the seismic resistant light bulb in which the filament is seismically strengthened up to about 1000 G. It has been confirmed that it can be used. Further, in an environment where the magnetic field does not change, even if a DC voltage is applied to light the filament, the filament is only biased and no particular problem occurs. Moreover, if the lighting device 2 that outputs an alternating voltage of 400 Hz or higher is used, the filament becomes more difficult to follow changes in the Lorentz force, and further, the vibration of the filament can be prevented even in a magnetic field having a large magnetic field strength. Also,
Since the filament has a sufficiently large mass as compared with the arc, if the lighting frequency is the same, the filament can be used without vibration even in a magnetic field having a higher magnetic flux density than the discharge lamp. However, since the filament has a natural frequency determined by the material and shape, it is necessary to prevent the lighting frequency from matching the natural frequency.
Furthermore, when a DC voltage is applied to the incandescent lamp 1b,
Although the filament is deformed depending on the direction and magnitude of the magnetic field, it may be used as long as it does not cause plastic deformation. That is, the incandescent light bulb 1b can also be operated by direct current.

The operation characteristics when the lighting conditions of the incandescent light bulb 1b are changed are shown below. However, in the following description, as in the configuration example shown in FIG. 10, the lighting device 2 is arranged at a place where there is no influence of the magnetic field, and the luminous flux is measured by an illuminometer facing the incandescent light bulb 1b and the lamp voltage is measured. The lamp current is measured in a place where there is no magnetic field. Further, the lamp power is obtained as the product of the lamp voltage and the lamp current.

FIG. 11 shows the relationship between the magnetic flux density and the lamp power ratio and luminous flux ratio when a 500 W mini halogen bulb (product number: JD110V) is lit at 50 Hz. Under this condition, no abnormality was found in the filament up to 204G, and slight vibration occurred in the filament at 253G. Further, at 533 G or higher, the vibration of the filament became large. Almost no change was observed in the lamp power ratio and the luminous flux ratio (within ± 3%). That is, 450G
It was usable to a degree.

FIG. 12 shows a 200 W clear light bulb (product number: L
110V 200W) shows the relationship between the magnetic flux density and the lamp power ratio and luminous flux ratio when the lamp is lit at 50 Hz,
Also in this case, it can be seen that there is almost no change in the lamp power or luminous flux up to 650G. However, the filament is 330
It was found that there was no vibration up to G, some vibration occurred at 403 G, and the vibration of the filament increased at 742 G or more. In 1767G, the filament was twisted. That is, it could be used up to about 700G.

On the other hand, when the clear bulb used in the same manner as in FIG. 12 was lit at 400 Hz (using an inverter), the filament was slightly vibrated at 1015G. That is, the effect of improving the vibration of the filament was confirmed at a lighting frequency of 400 Hz or higher. Moreover, in the case of the seismic resistant bulb (part number: RC110V-200W / C) in which the filament is earthquake-proofed, the filament was slightly vibrated at 1831G at 50 Hz, while it was lit at 400 Hz to 2000.
It was confirmed that vibrations did not occur in the filamenta even when G or more.

From these measurement results, it was confirmed that the incandescent light bulb 1b can be used without problems up to about 400 G even if it is turned on by a commercial power source. Also, when using the incandescent light bulb 1b, it was confirmed that the filament is less likely to vibrate when it is lit at 400 Hz or more than it is lit at 50 Hz. By the way, regarding the lighting device, there are an indirect effect due to the magnetic field acting on the lamp and a direct effect due to the effect of the magnetic field on the components constituting the lighting device.
That is, when the load of the lighting device is a discharge lamp,
When the magnetic field acts on the discharge lamp and the arc is deformed, the output voltage from the lighting device to the discharge lamp increases due to the rise in the lamp voltage, and the input power to the lighting device also increases accordingly. Thus, lighting the discharge lamp in the magnetic field has an indirect effect on the lighting device. On the other hand, in the lighting device, using a copper-iron type ballast,
Even an electronic ballast uses a transformer or choke coil, or has a low rated voltage (for example,
In some cases, a step-down transformer is used to turn on a 24V) incandescent light bulb. In this way, when using an electromagnetic component in which a coil is wound around an iron core in a lighting device,
By arranging the electromagnetic component in the magnetic field, the internal magnetic flux may be biased or the magnetic flux density may be changed. That is, a direct influence is exerted on the electromagnetic components that make up the lighting device. Hereinafter, an embodiment for avoiding the indirect influence and the direct influence of the magnetic field on the lighting device will be described.

(Embodiment 5) This embodiment has a configuration for reducing or eliminating the indirect influence of the magnetic field on the lighting device, and illustrates the case where the load of the lighting device is a discharge lamp. The feature of this embodiment is that the lighting device is configured so that the output power can be adjusted. This type of lighting device is known as a dimming lighting device, and is configured so that the light output of the discharge lamp can be adjusted by adjusting the power supplied to the discharge lamp. Here, as in Embodiment 1, a low-voltage discharge lamp such as a fluorescent lamp is used as the discharge lamp, and an inverter type lighting device is used as the lighting device. The lighting frequency of the discharge lamp is set to 20 kHz or higher. Therefore, the electric power supplied to the discharge lamp is adjusted by changing the on-duty and the switching frequency of the switching element that constitutes the lighting device. In other words, a separately excited control type high frequency lighting device that switches switching elements by a control signal from the control unit is configured, and the output of the lighting device is controlled by giving an external signal for instructing dimming to the control unit. .

Therefore, when the lighting device is adjusted so that the electric power supplied to the discharge lamp is reduced when the magnetic field is generated from the magnetic source than when the magnetic field is not generated,
It is possible to suppress an increase in supplied power due to the influence of the magnetic field. Here, since the light output of the discharge lamp increases due to the increase in the power supplied to the discharge lamp in the magnetic field, there is a tendency to reduce the power supplied to the discharge lamp when lighting the discharge lamp in the magnetic field as described above. By adjusting the output power of the lighting device, the stress of the lighting device can be reduced without significantly reducing the light output. In other words, by adjusting the output power of the lighting device in the direction of decreasing it, the increase tendency of the power supply to the discharge lamp is offset, and the change of the light output can be suppressed. Further, since the separately excited inverter is used as the lighting device, the on-duty and the switching frequency of the switching element can be easily adjusted.

In the present embodiment, the output power of the lighting device can be adjusted so that the fluctuation of the light output of the discharge lamp can be reduced even if the magnetic field changes. Rated light output in a normal environment where no special magnetic field is generated, when it is sufficient to obtain a predetermined light output in a magnetic field (that is, when the light output may be small in the absence of a magnetic field). The lighting device may be configured to supply the discharge lamp with electric power smaller than the electric power.
That is, the output power of the lighting device is set smaller than the rated output. If set in this way, the output power of the lighting device will increase when the discharge lamp is turned on in the magnetic field, but if the output power in the magnetic field does not exceed the upper limit, Overloading can be prevented. The configuration of the present embodiment can be applied not only to the low pressure discharge lamp but also to the high pressure discharge lamp.

(Embodiment 6) In Embodiment 5, a dimmable lighting device is used to adjust the output power of the lighting device so that the lighting device is not stressed by the influence of the surrounding magnetic field. However, the output power of the lighting device cannot be adjusted according to the influence of the magnetic field unless the light is adjusted in conjunction with the input power to the magnetic source, for example. In other words, it can be applied when installing a discharge lamp or a lighting device together with a magnetic field source, but when installing a discharge lamp or a lighting device in a place where a magnetic field source is already installed, or when installing a discharge lamp together with a magnetic field source. If it is difficult to predict the characteristics of the magnetic field generation source even when installed, it is difficult to apply the configuration of the fifth embodiment as it is.

In this embodiment, the magnetic field strength of the ambient magnetic field is detected by directly or indirectly measuring the lamp voltage by utilizing the characteristic that the lamp voltage rises according to the magnetic field strength in the magnetic field. A configuration for controlling the output of the lighting device according to the magnetic field strength is adopted. That is, FIG.
3, a voltage detection unit 3a that detects the voltage across the discharge lamp 1c (lamp voltage) and a current detection unit 3b that detects the supply current (lamp current) to the discharge lamp 1c are provided, and a power detection unit is provided. At 4, the product of the lamp voltage and the lamp current obtained by the voltage detection unit 3a and the current detection unit 3b is obtained as the lamp power, and an external signal (control signal) is sent to the control unit 2c of the lighting device 2 including the separately excited control type inverter circuit. Optical signal). The controller 2c controls the output based on the external signal from the power detector 4,
The lamp power calculated by the power detection unit 4 is controlled so as to be kept substantially constant. Here, the power supply device is a DC power supply unit DC that smoothes the output voltage of the rectifier RE and a rectifier RE that is a diode bridge that full-wave rectifies the commercial power supply AC.
Consists of The DC power supply unit DC is composed of a smoothing capacitor or a chopper circuit (active filter circuit), and the output voltage of the rectifier RE is stepped up or stepped down as necessary.

As described above, the influence of the magnetic field on the discharge lamp 1c is detected by the lamp power, and the output of the lighting device 2 is controlled so that the lamp power is kept substantially constant. And the lighting device 2 is hardly stressed due to the influence of the magnetic field. Further, if the magnetic field strength changes, it is reflected in the output of the power detection unit 4, so that the output of the lighting device 2 is automatically adjusted according to the change of the magnetic field strength, and the direction and the size change. It can be easily used even in such a magnetic field. Here, since the discharge lamp 1c is turned on, the lighting frequency is 20 as in the fifth embodiment.
It is desirable to set it to kHz or higher. Although an HID lamp can be used as the discharge lamp 1c, it is preferable to use the fluorescent lamp because the fluorescent lamp is less affected by the magnetic field and the dimming control is easy in an environment where the magnetic field strength is large.

(Seventh Embodiment) In the sixth embodiment, the influence of the magnetic field is detected by the lamp power and the output power of the lighting device 2 is controlled to be substantially constant. However, in the present embodiment, the lighting device 2 is controlled. The sixth embodiment is different from the sixth embodiment in that the input power is controlled to be kept substantially constant. That is, FIG.
As shown in FIG. 4, the lighting device 2 includes a power supply device including a rectifier RE that rectifies the commercial power supply AC and a DC power supply unit DC that smoothes the output of the rectifier RE, and a lighting device, as in the sixth embodiment. The lighting device 2 is provided with the device 2.
Is provided with a control unit 2c that controls output by an external signal.
Here, the input power is equivalent to the input power to the lighting device 2, and the output voltage of the DC power supply unit DC is almost constant,
A resistor Rs for current detection is inserted between the DC power supply unit DC and the lighting device 2, and the power detection unit 4 detects the input current to the lighting device 2 based on the voltage across the resistor Rs and the DC power supply unit DC. If the product of the output voltage and the input current is calculated, the power corresponding to the input power to the lighting device 2 can be calculated. In this way, the lighting device 2 uses the signal corresponding to the input power obtained by the power detection unit 4 as an external signal.
The control unit 2c controls the output so that the input power supplied from the power detection unit 4 is kept substantially constant. That is, if the output of the lighting device 2 is controlled, the power supplied to the discharge lamp 1c changes, and as a result, the current flowing into the lighting device 2 also changes, so that the input power to the lighting device 2 is kept substantially constant. In this case, the input power of the lighting device 2 does not become excessive, and the lighting device 2 increases with the increase of the lamp power when the discharge lamp 1c is arranged in the magnetic field.
The increase in the stress of is suppressed. Other configurations and operations are the same as those of the sixth embodiment.

(Embodiment 8) In this embodiment, as shown in FIG. 15, a magnetic sensor 5 for detecting the magnetic field around the discharge lamp 1c is provided, and the output of the lighting device 2 is changed according to the output of the magnetic sensor 5. The control structure is adopted. That is, in the sixth and seventh embodiments, the lamp power of the discharge lamp 1c is directly or indirectly obtained and the magnetic field strength is indirectly detected by the lamp power. However, in the present embodiment, the magnetic sensor 5 is used to detect the magnetic field. The intensity is detected directly. A Hall element or a Hall IC is used as the magnetic sensor 5. Here, as the lighting device 2, a device that outputs a high frequency of 20 kHz or more and can control the output by inputting an external signal (dimming signal) to the control unit 2c is used.

As described above, since the output power of the lighting device 2 increases as the magnetic field strength around the discharge lamp 1 increases, the output power of the lighting device 2 increases as the magnetic field strength detected by the magnetic sensor 5 increases. It is necessary to adjust in the direction to suppress. That is, it is necessary to keep the output power of the lighting device 2 constant regardless of the magnetic field strength, or to control the output power of the lighting device 2 to decrease as the magnetic field strength increases.

Therefore, the signal converter 6 is provided with a table in which the output value of the magnetic sensor 5 and the output power (light control amount) of the lighting device 2 are associated with each other, and the output of the magnetic sensor 5 is input to the signal converter 6. By doing so, a dimming signal corresponding to the magnetic field strength is generated, and the lighting device 2 is controlled by this dimming signal. The output power of the lighting device 2 can be adjusted either continuously or stepwise. In the case of continuous control, the lighting device 2 capable of continuous dimming is used to perform stepwise control. In the case of controlling to, the lighting device 2 capable of stepwise dimming is used. The setting values of the table provided in the signal conversion unit 6 are experimentally set in advance, and are set according to the configuration of the lighting device as in the above-described embodiments. Here, the configuration in which the output power of the lighting device 2 is adjusted in order to reduce the stress on the lighting device 2 may be adopted when the incandescent lamp 1b is lighted, not limited to the discharge lamp 1c.

(Ninth Embodiment) In the eighth embodiment, the signal conversion unit 6 generates a dimming signal based on the magnetic field intensity detected by the magnetic sensor 5 so that the output power of the lighting device 2 is continuously or multistaged. Although adjusted, in the present embodiment, when the magnetic field strength detected by the magnetic sensor 5 reaches a predetermined value, the output power of the lighting device 2 is switched to be reduced.

That is, as shown in FIG. 16, the impedance of the current limiting element inserted in the power supply path from the lighting device 2 to the discharge lamp 1c is switched in two stages.
Here, two inductors L ₁ and L ₂ are connected in series, and one inductor L ₂ is connected in parallel with a switch element SW. Further, the output of the magnetic sensor 5 is input to the comparison unit 7 and compared with a preset threshold value. here,
When the output of the magnetic sensor 5 exceeds the threshold value, it is determined that the magnetic field strength has exceeded a predetermined value, and the switch element SW is turned off. In this way, as the magnetic field strength increases, the impedance of the current limiting element increases, so that the power supplied to the discharge lamp 1c can be reduced. In this configuration, the inductors L ₁ and L ₂ and the switch element SW function as the control unit 2c of the lighting device 2, and the comparison unit 7 outputs the dimming signal. The inductances of the inductors L ₁ and L ₂ are experimentally determined by the specifications of the discharge lamp 1c and the lighting device 2.

(Embodiment 10) As described above, when the discharge lamp is arranged in the magnetic field, the lamp voltage is higher than that in the case where the magnetic field is not present. Therefore, in order to protect the lighting device, it is conceivable to adjust the input power or the output power of the lighting device as in the fifth to ninth embodiments, but if it deviates from the adjustment range, the lighting device is overloaded and destroyed. Sometimes. For example, when the discharge lamp is used as the load of the lighting device, at the end of its life, a half-wave discharge (emily) occurs due to the consumption of the electrodes, so that the load on the lighting device becomes abnormally large.

Therefore, in the present embodiment, as shown in FIG. 17, an abnormality detection circuit 8 for stopping the output of the lighting circuit 2 based on the lamp voltage (which may be the lamp power) detected by the voltage detection section 3a is provided. There is. In the abnormality detection circuit 8, when the lamp voltage detected by the voltage detection unit 3a exceeds a preset reference level, the output of the lighting device 2 is stopped and the lighting device 2 is protected. With this configuration, the lighting device 2 is protected against an abnormal rise in the lamp voltage at the end of the life of the discharge lamp 1c. That is, the abnormality detection circuit 8 outputs an abnormality signal when detecting an abnormality, and stops the output of the lighting device 2 by this abnormality signal.

As a structure for protecting the lighting device 2, the lighting device 2 is stopped, the output power is reduced to such an extent that the lighting device 2 is not destroyed, and an output is intermittently generated from the lighting device 2 when an abnormality is detected. By doing so, it is possible to employ a configuration in which the discharge lamp 1c is intermittently lit at a cycle at which it can be visually recognized. Here, the configuration for controlling the output of the lighting device 2 by the abnormality signal may be provided separately from the control unit 2c or may be used also as the control unit 2c. Also,
In the example of FIG. 17, the abnormality is detected based on the output of the lighting device 2, but the abnormality may be detected based on the input to the lighting device 2.

By the way, when the lighting device 2 is protected against the end of life operation of the discharge lamp 1c as described above,
Even if the discharge lamp 1c is normal, the abnormality detection circuit 8 may operate due to an increase in the lamp voltage when the lamp is turned on in the magnetic field. Therefore, in the present embodiment, the magnetic sensor 5 is provided, the magnetic sensor 5 for detecting the magnetic field strength of the magnetic field formed around the discharge lamp 1c is provided, and the increase in the lamp voltage according to the magnetic field strength is detected by the abnormality detection circuit. By adding to the threshold value of 8, the abnormality detection circuit 8 does not respond to the rise of the lamp voltage due to the influence of the magnetic field. In short, the threshold value of the abnormality detection circuit 8 is changed according to the magnetic field strength detected by the magnetic sensor 5.

With the above configuration, even if the discharge lamp 1c is arranged in an environment where the magnetic field strength is different, the threshold value of the abnormality detection circuit 8 is automatically corrected, and malfunction does not occur without manually adjusting the threshold value of the abnormality detection circuit 8. Can be prevented. (Embodiment 11) In Embodiment 10, the end of life of the discharge lamp 1c is detected by detecting the rise of the lamp voltage. However, as described above, when the discharge lamp 1c is arranged in the magnetic field, the lamp voltage is changed. Since it rises, it is also possible to detect the magnetic field strength around the discharge lamp 1c when the discharge lamp 1c is arranged in the magnetic field.
That is, if the lamp voltage of the discharge lamp 1c rises, it can be considered that the magnetic field strength becomes larger than in the normal environment. Therefore, if the lamp voltage is in a range lower than the lamp voltage indicating an abnormality such as a half-wave discharge state, It can be used to detect the magnetic field strength.

Therefore, in the present embodiment, as shown in FIG. 18, the dimming signal is given to the control section 2c of the lighting device 2 by the output of the abnormality detection circuit 8. The abnormality detection circuit 8 stops the operation of the lighting device 2 (or reduces the output or performs the intermittent operation) when the reference level for the lamp voltage in the abnormal state of the discharge lamp 1c reaches the same level as in the tenth embodiment. Control unit 2c until reaching the reference level
To provide a dimming signal to. in short,
When the lamp voltage becomes higher than the normal environment until the lamp voltage reaches the reference level, the output of the lighting device 2 is controlled in accordance with the output of the abnormality detection circuit 8.
By adopting this configuration, the abnormality detection circuit 8 also has a function of making the output power of the lighting device 2 equal to or lower than the output power in the normal environment. Other configurations are similar to those of the tenth embodiment.

(Twelfth Embodiment) The present embodiment is intended to suppress or eliminate the direct influence of the magnetic field on the lighting device 2. As described above, the lighting device 2 includes a choke coil, a transformer and the like. The electromagnetic parts of
If these electromagnetic components are arranged in a magnetic field, the magnetic field will affect the operation. The lighting device 2 needs to be arranged in the magnetic field mainly in the following two cases. That is, when the output frequency of the lighting device 2 increases, the loss in the line connecting the lighting device 2 and the discharge lamp 1c may increase and radiation to the outside may occur. There are a case where the lamp 1c and the lighting device 2 are arranged at a short distance, and a case where the discharge lamp 1c and the lighting device 2 are incorporated into one device body as a lighting device.

When the lighting device 2 is arranged in a magnetic field, if a copper-iron type ballast is used, the magnetic flux in the ballast may be biased or the magnetic field strength may change. Become. Such a phenomenon occurs even if the direction of the applied magnetic field is changed by changing the direction of the ballast.
Further, even an electronic ballast has a transformer and a choke coil as circuit components, so that the magnetic characteristics change and the operation is affected.

Here, in order to confirm the influence of the magnetic field on the lighting device 2, an operation example when the lamp is arranged outside the magnetic field and only the lighting device 2 is arranged inside the magnetic field will be shown. Figure 36 is 36W
The operation characteristics when the twin fluorescent lamp (product number: FPL36) of No. 2 is turned on by the lighting device 2 including a copper-iron type ballast, and FIG. Relationship (solid line is lamp power ratio, broken line is luminous flux ratio),
FIG. 6B shows the relationship between the magnetic flux density and the lamp voltage ratio. Under this condition, it was possible to illuminate up to 1478G without any abnormality, but at 1500G, the lamp disappeared. In addition, the lamp power ratio, luminous flux ratio, and lamp voltage ratio are 15
It changed rapidly around 00G.

FIG. 20 shows the fluorescent lamp with a lighting frequency of 40.
The relationship between the magnetic flux density and the input power ratio (solid line) and the luminous flux ratio (broken line) when the lighting device 2 using an electronic ballast of kHz is used for lighting is shown. Under this condition, it was lit up to 1478G without any abnormality, but disappeared at 1667G. The input power ratio and the luminous flux ratio are 1500
It changed rapidly near G.

As described above, in the fluorescent lamp, when the lighting device 2 is arranged in the magnetic field, it is understood that the fluorescent lamp is affected by the magnetic field regardless of whether it is a copper-iron type or an electronic type. Here, in FIGS. 19 and 20, since the lamp is arranged outside the magnetic field, it can be seen that the lighting device 2 itself is affected by the magnetic field. In other words, the same tendency can be seen with HID lamps instead of fluorescent lamps.

In the case of an incandescent light bulb, a ballast is not necessary, but a copper-iron type transformer or an electronic type transformer may be used for voltage conversion. Fig. 21 shows copper-iron type, Fig. 22
Shows the relationship between the magnetic flux density and the output power ratio for the electronic type. Thus, it can be seen that the output power increases as the magnetic field strength increases. Therefore, when the lighting device 2 is arranged in the magnetic field, it is necessary to prevent the lighting device 2 from being affected by the magnetic field. That is, as shown in FIG. 23, the magnetic shield 9 formed of a magnetic material such as stainless steel is used to surround the lighting device 2 so that the lighting device 2 is not affected by the magnetic field.
For example, as shown in FIG. 24, if the lighting device 2 is housed in a case 11 composed of a base plate 11 a and a cover plate 11 b formed of a magnetic material such as steel plate or stainless steel, the influence of the magnetic field on the lighting device 2 is reduced. Can be suppressed. That is, the case 11 functions as a magnetic shield.

Further, in the lighting device 2, the magnetic field is influenced by the electromagnetic component including the coil such as the transformer or the choke coil, and therefore, it is mounted on the circuit board 12 made of the printed wiring board as shown in FIG. Electromagnetic parts 1
Only 3 may be stored in the case 11 made of a magnetic material. By connecting the case 11 to the ground pattern of the circuit board 12 here, the case 11 can also function as an electromagnetic shield. That is, when the lighting device 2 outputs a high frequency, a high frequency is radiated from the electromagnetic component 13. Therefore, by using the case 11 as an electromagnetic shield, the high frequency radiation can be reduced.

(Embodiment 13) This embodiment is a lighting fixture in which a fluorescent lamp 1a and a lighting device 2 are provided in a fixture body 10 as shown in FIG. It is arranged in a form surrounded by parts. That is, the fixture body 10 includes the socket 14 that holds the fluorescent lamp 1a, and the reflection plate 15 that distributes the light from the fluorescent lamp 1a downward. The upper part of the reflector 15 in the fixture body 10 forms a closed space, and the lighting device 2 is housed in this closed space.
Here, the fixture body 10 including the reflection plate 15 is formed of a magnetic material such as a steel plate or stainless steel, and as a result, the lighting device 2 is surrounded by the magnetic material. That is, a part of the fixture body 10 functions as a magnetic shield that surrounds the lighting device 2.

(Embodiment 14) In this embodiment, as shown in FIG. 27, in addition to the configuration of embodiment 13 shown in FIG. 26, a shield body 16 for accommodating the instrument body 10 is provided. The shield body 16 is made of a magnetic material such as a steel plate or stainless steel, and is formed in a box shape having an open upper surface. Further, an opening window 17 for taking out light from the fluorescent lamp 1a is formed on the lower wall of the shield body 16.

Since the instrument body 10 is housed in the shield body 16 functioning as a magnetic shield, the influence of the ambient magnetic field from the ambient magnetic flux on the fluorescent lamp 1a is reduced, and not only the lighting device 2 but also the fluorescent light is emitted. The influence of the magnetic field on the lamp 1a is also suppressed. That is, according to this configuration, even in a strong magnetic field that cannot be lit without the shield body 16,
It is possible to stably turn on the fluorescent lamp 1a. Here, it goes without saying that a lamp other than the fluorescent lamp 1a can be used, and the use of the shield 16 raises the upper limit of usable magnetic field strength.

(Fifteenth Embodiment) In each of the above-mentioned embodiments,
A configuration in which the lamp is placed in a magnetic field and the lighting device is separately placed in a place not affected by the magnetic field, a configuration in which the lamp and the lighting device are placed in the magnetic field, and The configuration and the by the way,
When performing indoor lighting, a plurality of lamps are often arranged, and it is usual that the magnetic field strength is different depending on the arrangement location of each lamp and the lighting device 2. In addition, it may be appropriate for a lighting design to arrange a plurality of types of lamps in a room. For example, an incandescent light bulb can be used in a place with a high magnetic field strength, but it has lower efficiency and lower color rendering than a discharge lamp.
Since the high-pressure discharge lamp has high efficiency, it is easily affected by the magnetic field, so that it is desirable to install it in a place where the magnetic field strength is small.
As described above, if the number of lamps and lighting devices 2 arranged at different magnetic field strengths increases, it takes a lot of time and effort to make individual adjustments. Therefore, in this embodiment, as shown in FIG. 28, a management device 19 using a computer is introduced,
A large number of lamps 1 and lighting devices 2 are managed by the management device 19.
An example of centralized control of is shown.

That is, the magnetic sensor 5 for detecting the ambient magnetic field is arranged adjacent to each lamp 1, and the output of the magnetic sensor 5 is input to the management device 19. In addition, the management device 1
Reference numeral 9 adjusts the output power of the lighting device 2 by outputting a dimming signal to the control unit 2c of the lighting device 2. Here, the output of the magnetic sensor 5 may be taken into the management device 19 using an interface such as the RS232C standard, and the lighting device 2 may be controlled using the interface such as the GPIB standard.

When controlling a large number of lamps 1, the output of the magnetic sensor 5 provided adjacent to each lamp 1 and the output of the dimming signal to the lighting device 2 are sequentially performed for each lamp 1. .. Such control can be easily realized by providing the management device 19 with a multiplexer. Here, A of FIG. 28 shows a group of the lamp 1, the lighting device 2, and the magnetic sensor 5. Further, not only the magnetic sensor 5 is provided adjacent to the lamp 1, but the magnetic sensor 5'is also provided adjacent to the lighting device 2 so that the influence of the magnetic field on the lighting device 2 can be taken into consideration. If the illuminance sensor 18 that detects the light output of the lamp 1 is provided, the brightness can be maintained in an appropriate state by monitoring the light output of the lamp 1. In other words, the illuminance sensor 18 is provided to verify whether or not a desired light output is obtained according to the relationship between the ambient magnetic field strength and the dimming signal, and the management device 19 detects that the illuminance is abnormal and the lamp. Take appropriate measures such as turning off 1. The illuminance sensor 18 does not necessarily have to be provided in association with each lamp 1, but if it is necessary to detect an abnormality for each lamp 1, it is desirable to provide it for each lamp 1.

Further, the lighting device 1 does not necessarily have to light only one lamp 1, and a plurality of lamps 1 may be lighted by one lighting device 1. However,
In this case, the lamp 1 connected to one lighting device 2 is required to have a positional relationship such that the magnetic field strengths of the ambient magnetic fields are substantially equal. By the way, when controlling the input power and the output power of the lighting device 2 according to the surrounding magnetic field using the magnetic sensors 5 and 5 ′, the magnetic sensors 5 and 5 ′ may be arranged for each lamp 1. The number of magnetic sensors 5 and 5'is large, resulting in high cost. Therefore, in the lamp 1 arranged at a location where the magnetic field strength is substantially equal, the magnetic sensor 5,
It is possible to share the 5 '.

For the sake of simplicity, it is assumed that there is only one magnetic generation source X as shown in FIG. 29 and the magnetic field around the magnetic generation source X is concentrically distributed. In this case, the magnetic field has a one-to-one correspondence with the distance from the magnetic source X, for example, 1000 depending on the distance from the magnetic source X.
Circular magnetic flux density lines Y of G, 600G, and 200G are obtained. Therefore, along the line Y of the equal magnetic flux density, the lamp 1
When the (luminaire) is arranged, it can be considered that the influence of the magnetic field on the lamp 1 is equal regardless of where the lamp 1 is arranged on each of the equal magnetic flux density lines Y. That is,
When a plurality of luminaires Y are arranged in each area divided by the magnetic flux density, the influence of the magnetic field on the plurality of lamps 1 in the same area becomes equal. Further, even if the magnetic field intensity generated from the magnetic generation source X changes, it is considered that the relative ratio between the equal magnetic flux density lines Y is maintained, so if the distribution of the magnetic flux density is obtained, the magnetic flux at one location It is possible to estimate the magnetic flux density at other locations simply by knowing the density. Actually, the equal magnetic flux density line Y is often not circular, but if the distribution of the magnetic flux density in the interior is measured and the points where the magnetic flux densities are equal are connected to obtain the equal magnetic flux density line Y. , This technical idea can be applied.

As described above, when a plurality of lamps are provided, it is possible to perform centralized management by controlling the management device 19, and the lamps 1 are divided into regions having the same magnetic flux density. By selecting and arranging the types and controlling the lamps 1 collectively for each area, the control becomes easy and the illumination can be performed at a low cost with relatively few constituent elements.

In this embodiment, the example in which the lamp 1 is arranged on the equal magnetic flux density line Y has been described, but only the lamp is arranged on the equal magnetic flux density line, or the lamp 1 and the lighting device 2 are arranged on the equal magnetic flux density line. The same technical idea can be applied even when it is arranged on Y.

[0100]

According to the first aspect of the invention, since the voltage applied to the discharge lamp is alternated at 400 Hz or higher, the arc cannot follow the change in the direction of the Lorentz force due to the interaction with the magnetic field, and as a result, the arc is generated. To be kept stationary. As a result, there is an advantage that the discharge lamp can be stably turned on even in a magnetic field of 30 G or more.

According to the second aspect of the present invention, since the voltage applied to the discharge lamp is alternated at 20 kHz or higher, the arc can be stopped in a magnetic field of 30 G or higher to stably turn on the discharge lamp. That is, there is an effect that noise is reduced when the alternating frequency is higher than the audible frequency. Further, if the frequency becomes higher, a small inductor or the like can be used, so there is an advantage that the size and weight can be reduced. Moreover, when the polarity of the voltage applied to the discharge lamp is reversed, A voltage is applied before the ions disappear, and there is an advantage that power consumption is reduced because re-ignition is not performed. According to the invention of claim 3, since the discharge lamp is a low-pressure discharge lamp and the electric power supplied to the discharge lamp can be adjusted, the discharge lamp is turned on in a magnetic field so that the lamp voltage is higher than in a normal environment. In this state, the power supplied to the discharge lamp can be reduced, and the rise in lamp voltage can be suppressed. As a result, there is an advantage that the rise of the lamp voltage can be suppressed by adjusting the electric power supplied to the discharge lamp, and the stress of the lighting device can be reduced to prevent the breakdown or damage.

According to the invention of claim 4, since the discharge lamp is a low-voltage discharge lamp for high-frequency lighting, when the applied voltage to the discharge lamp is alternating at 20 kHz or more, the discharge lamp also used for high-frequency lighting is used. This has the advantage of reducing power loss. According to the invention of claim 5, the discharge lamp is a high pressure discharge lamp, and the frequency for alternating the voltage applied to the discharge lamp is set to be equal to or lower than the acoustic resonance frequency. Therefore, the alternating frequency of the applied voltage is set to the specifications of the high pressure discharge lamp. The occurrence of the acoustic resonance phenomenon can be suppressed by setting the acoustic resonance frequency to be equal to or lower than that. As a result, there is an advantage that it is possible to prevent flickering in the light output and breakage of the arc tube.

According to the sixth aspect of the invention, since it is a separately excited control type high frequency lighting device, there is an advantage that dimming control by applying an external signal becomes possible. That is, the control of the output power becomes easier than that of the self-excited control type. According to the invention of claim 7, the output to the discharge lamp is set so that the output when the discharge lamp is arranged in the magnetic field is equal to or less than the allowable upper limit value. Therefore, the discharge lamp is arranged in the magnetic field. Therefore, even if the lamp voltage rises, the lamp voltage does not become excessive and there is an advantage that the discharge lamp can be prevented from being destroyed. Further, the fact that the lamp voltage in the magnetic field becomes equal to or lower than the allowable upper limit value can give electric power smaller than the rated electric power in the normal environment.

According to the eighth aspect of the present invention, since the voltage applied to the discharge lamp is direct current, if the magnetic field in the space where the discharge lamp is arranged is a stationary magnetic field whose direction and magnitude do not change, it acts on the arc. Since the direction and magnitude of the Lorentz force do not change, and flicker due to vibration of the arc does not occur, there is an effect that stable lighting can be achieved.

According to the ninth aspect of the invention, when the discharge lamp is lit by direct current, the polarity of the voltage applied to the discharge lamp is reversed at a predetermined cycle, and the cycle is perceived as a flicker due to a change in light output due to the polarity reversal. Since it is set to a length that does not occur, there is an advantage that the occurrence of catalysis can be suppressed. The cycle of polarity reversal is determined by the specifications (particularly the shape) of the discharge lamp and the ambient temperature, and is generally set within the range of 1 minute or more and 1 hour or less. For example, if it is set to 10 minutes, the polarity will be reversed every 5 minutes, and if it is this level, it will not be perceived as flicker, so there will be no discomfort, and the polarity will be reversed in about 1 hour. In this case, catalysis does not proceed sufficiently and the electrode wear is less biased, which has the advantage of reducing the adverse effects of direct current lighting.

According to the tenth aspect of the present invention, since the incandescent lamp is arranged in the magnetic field, it is possible to stably turn on the incandescent lamp even when the magnetic flux density is 200 G or more when the incandescent lamp is turned on by the commercial power source. There are advantages. According to the invention of claim 11, since the light source is an incandescent light bulb whose seismic resistance is enhanced, vibration of the filament due to lighting of the alternating voltage is suppressed, and stable lighting is possible even when the magnetic field strength becomes considerably large. It has the advantage of being possible.

According to the twelfth aspect of the present invention, the voltage applied to the incandescent lamp is alternated at 400 Hz or higher. Therefore, the filament can follow the Lorentz force acting on the filament at 400 Hz or higher, similarly to the arc of the discharge lamp. It disappears and as a result the filament remains stationary in place. That is, there is an advantage that the filament does not vibrate and deterioration is prevented.

According to the thirteenth aspect of the present invention, since the voltage applied to the incandescent lamp is DC, the direction and strength of the Lorentz force acting on the filament are changed if the magnetic field is a stationary magnetic field that does not change the direction and strength. However, if the filament is not plastically deformed, the filament can be stably lit without deterioration even if the magnetic field strength is considerably increased.

According to a fourteenth aspect of the present invention, there is provided a lighting device having a control unit for controlling output according to an external signal, and power detection for giving an external signal to the control unit according to a change in lamp power due to an action of a magnetic field on the lamp. Since it has a section, there is an advantage that a change in lamp power due to the influence of a magnetic field can be suppressed. In other words, by controlling so as to suppress the increase in the lamp power due to the influence of the magnetic field, it is possible to reduce the life of the lamp due to the increase in the lamp power and reduce the stress on the lighting device due to the increase in the power supplied to the lamp. The advantage is that

In the fifteenth aspect of the present invention, the power detector detects the output power to the lamp, and the controller controls the output so that the output power detected by the power detector is kept substantially constant. Since the output power to the lamp is kept almost constant, there is an advantage that the lamp power is not increased by the action of the magnetic field and the stress on the lamp due to the influence of the magnetic field is prevented, and as a result, the shortening of the lamp life is suppressed. Has the effect.

According to the sixteenth aspect of the present invention, the power detector detects the input power, and the controller controls the output so that the input power detected by the power detector is kept substantially constant. Since the input power is kept almost constant, there is an advantage that the increase in the input power to the lighting device due to the action of the magnetic field is suppressed and the stress to the lighting device is prevented, and as a result, the deterioration or destruction of the lighting device is prevented. There is an advantage that the stress on the lamp can be reduced because it is prevented and the output power to the lamp is not increased unless the input power to the lighting device is increased.

According to a seventeenth aspect of the present invention, a lighting device having a control unit for controlling output according to an external signal, a magnetic sensor for detecting at least a magnetic field around the lamp, and a magnetic field intensity detected by the magnetic sensor are higher than those in a normal environment. When it becomes larger, it is provided with an external signal generation unit that gives an external signal to the control unit that makes the output power less than the output power in a normal environment, and detects at least the ambient magnetic field of the lamp using a magnetic sensor,
While supplying power to the lamp according to the ambient magnetic field, the output power to the lamp when the lamp is in the magnetic field,
Since it is below the output power in the normal environment, the lamp power of the lamp placed in the magnetic field will be equal to or smaller than the normal environment, resulting in an increase in the lamp power in the magnetic field. There is an advantage that can suppress. That is, the stress on the lamp is reduced and the stress on the lighting device is also reduced.

According to the eighteenth aspect of the present invention, an abnormality detecting means for detecting an abnormality of the discharge lamp by comparing at least one of the input value and the output value of the discharge lamp with a reference level, and the abnormality detecting means detects the abnormality of the discharge lamp. It is provided with a lighting device whose output is controlled to reduce the output power to the discharge lamp when an abnormality is detected. For example, an Emiles state (half-wave discharge state) that occurs at the end of life.
If this is detected and the output is reduced, there is an advantage that it is possible to prevent the lighting device from being damaged by an excessive current in the emily state.

According to the nineteenth aspect of the present invention, the magnetic sensor for detecting at least the magnetic field around the discharge lamp and the reference level are set so as to cancel the increase in the lamp voltage from the normal environment based on the magnetic field intensity detected by the magnetic sensor. If the discharge lamp is normal, the relative difference with the reference level hardly changes even if the discharge lamp is normal, and the level between the lamp voltage and the reference level is set only when there is an abnormality. There is an advantage that a difference occurs and it is possible to detect as an abnormality. That is, it is possible to easily distinguish whether the increase in the lamp voltage is normal due to the influence of the magnetic field or abnormal such as the end of the life of the lamp.

According to the twentieth aspect of the invention, the lighting device includes a control unit for controlling output according to an external signal, and the abnormality detecting means outputs the output power to the normal environment when the detected value before reaching the reference level becomes larger than the normal environment. The external signal that is less than or equal to the output power of the discharge lamp is given to the control unit, and when the discharge lamp is abnormal at the end of the discharge lamp life, the detected value of the input or output of the discharge lamp reaches the reference level. There is an effect that it can be detected as an abnormality.
Further, since the detected value reflects the influence of the ambient magnetic field of the discharge lamp when the discharge lamp is normally lit, the ambient magnetic field is estimated from the detected value and output control is performed according to the ambient magnetic field. be able to. Here, if the detected value becomes larger than the normal environment, it means that the ambient magnetic field becomes large.Therefore, when the detected value rises, the output power is set to be the same as or smaller than the normal environment. There is an advantage that stress can be reduced. Further, if the stress of the discharge lamp is reduced, the stress of the lighting device is also reduced.

The invention of claim 21 is an illuminating device equipped with a lighting device arranged in a magnetic field of 30 G or more, and since the lighting device is magnetically shielded, the influence of the magnetic field on the lighting device is reduced. There is almost no advantage that it is possible to prevent abnormal operation of the lighting device. According to a twenty-second aspect of the present invention, there is provided a lighting device that includes at least one electromagnetic component around which a coil is wound and that is arranged in a magnetic field of 30 G or more, and the electromagnetic component is magnetically shielded. However, since the magnetic shield is applied to the electromagnetic components that are particularly susceptible to the magnetic field, there is an advantage that abnormal operation due to the magnetic field is prevented.

According to a twenty-third aspect of the present invention, there is provided a lighting fixture arranged in a magnetic field of 30 G or more, wherein the lamp and the lighting device are mounted on one fixture main body, and a part of the fixture main body is at least a magnetic field of the lighting device. Since the lamp constitutes the shield and the lamp and the lighting device are provided in the main body of the fixture, the lighting device is also arranged in the magnetic field when the lamp is arranged in the magnetic field. Since the magnetic shield is provided by a part of the main body, there is an advantage that the influence of the magnetic field on the lighting device is reduced and abnormal operation does not occur.

According to a twenty-fourth aspect of the present invention, a plurality of lamps arranged in a magnetic field of 30 G or more, a plurality of lighting devices for supplying power to the respective lamps, a magnetic field detecting means for detecting an ambient magnetic field of each lamp, and a magnetic field. The management device centrally controls the output from the lighting device to each lamp so as to reduce the influence of the ambient magnetic field detected by the detection means. In this configuration, a plurality of lamps arranged in the magnetic field are managed by the management device. It is possible to perform centralized control by means of the control device, and the control device controls the output from the lighting device to the lamp so as to reduce the influence of the magnetic field around each lamp. Since the management device controls the lighting device based on the detected magnetic field, it is possible to properly control the output to each lamp even when many lamps are arranged in the magnetic field. There is an advantage that kill.

[Brief description of drawings]

FIG. 1 is a block diagram showing a first embodiment.

FIG. 2 is an operation explanatory diagram of a comparative example with respect to the first embodiment.

FIG. 3 is an operation explanatory diagram of the first embodiment.

FIG. 4 is an operation explanatory diagram of a comparative example with respect to the second embodiment.

FIG. 5 is an operation explanatory diagram of a comparative example with respect to the second embodiment.

FIG. 6 is an operation explanatory diagram of a comparative example with respect to the second embodiment.

FIG. 7 is an operation explanatory diagram of a comparative example with respect to the second embodiment.

FIG. 8 is an operation explanatory diagram of a comparative example with respect to the second embodiment.

FIG. 9 is an operation explanatory diagram of a comparative example with respect to the second embodiment.

FIG. 10 is a block diagram of a fourth embodiment.

FIG. 11 is an operation explanatory diagram of the fourth embodiment.

FIG. 12 is an operation explanatory diagram of the fourth embodiment.

FIG. 13 is a block diagram of a sixth embodiment.

FIG. 14 is a block diagram of a seventh embodiment.

FIG. 15 is a block diagram of an eighth embodiment.

FIG. 16 is a block diagram of Embodiment 9.

FIG. 17 is a block diagram of Embodiment 10.

FIG. 18 is a block diagram of an eleventh embodiment.

FIG. 19 is an operation explanatory diagram showing the measurement result of the influence of the magnetic field on the lighting device.

FIG. 20 is an operation explanatory view showing the measurement result of the influence of the magnetic field on the lighting device.

FIG. 21 is an operation explanatory view showing the measurement result of the influence of the magnetic field on the lighting device.

FIG. 22 is an operation explanatory view showing the measurement result of the influence of the magnetic field on the lighting device.

FIG. 23 is a block diagram showing an twelfth embodiment.

FIG. 24 shows Embodiment 12, (a) is a plan view,
(B) is a front view, (c) is a side view.

FIG. 25 is a sectional view showing another example of the twelfth embodiment.

FIG. 26 shows Embodiment 13, (a) is a bottom view,
(B) is a front view, (c) is a side view.

FIG. 27 shows a fourteenth embodiment, (a) is a bottom view,
(B) is a front view, (c) is a side view.

FIG. 28 is a block diagram showing a fifteenth embodiment.

FIG. 29 is a diagram showing an arrangement example of lamps in the fifteenth embodiment.

[Explanation of symbols]

 1 Lamp 1a Fluorescent Lamp 1b Incandescent Light Bulb 1c Discharge Lamp 2 Lighting Device 2a Ballast 2b Power Supply Device 2c Control Section 3a Voltage Detection Section 3b Current Detection Section 4 Power Detection Section 5 Magnetic Sensor 5'Magnetic Sensor 6 Signal Conversion Section 7 Comparison Section 8 Abnormality detection circuit 9 Magnetic shield 10 Instrument main body 11 Case 11a Base plate 11b Cover plate 12 Circuit board 13 Electromagnetic component 14 Socket 15 Reflector 16 Shield 17 Open window 18 Illumination sensor 19 Management device

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masataka Nishi Nishi 1 80-1, Mukaiyama, Naka-machi, Naka-gun, Naka-gun, Ibaraki Japan Inside the Naka Institute of the Japan Atomic Energy Research Institute (72) Inventor, Yoshida Murano 4-8 Shibaura, Minato-ku, Tokyo No. 33 Kandenko Co., Ltd. (72) Inventor Kazuo Funabashi 4-833 Shibaura, Minato-ku, Tokyo Kandenko Co., Ltd. (72) Kenichi Okada 4-83-3 Shibaura, Minato-ku, Tokyo Co., Ltd. KANDENKO (72) Inventor Akio Okude 1048, Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Works Co., Ltd. (72) Inventor, Seimei Uchihashi 1048, Kadoma, Kadoma, Osaka Matsushita Electric Works Co., Ltd. (72) Invention Person Takashi Asanuma 1048, Kadoma, Kadoma-shi, Osaka Prefecture Matsushita Electric Works Co., Ltd.

Claims (24)

[Claims] 1. A lighting device in which a light source is arranged in a magnetic field of 30 G or more, comprising a discharge lamp as a light source and a lighting device for alternating an applied voltage to the discharge lamp at 400 Hz or more. High magnetic field lighting device. 2. The lighting device applies a voltage of 2 to the discharge lamp.
The high magnetic field lighting device according to claim 1, wherein the lighting device is alternated at 0 kHz or higher. 3. The discharge lamp is a low pressure discharge lamp,
The lighting device for a high magnetic field according to claim 2, wherein the lighting device is capable of adjusting a power supplied to the discharge lamp. 4. The high magnetic field lighting device according to claim 2, wherein the discharge lamp is a low-pressure discharge lamp for high frequency lighting. 5. The discharge lamp is a high pressure discharge lamp,
2. The high magnetic field lighting device according to claim 1, wherein the lighting device has a frequency at which the voltage applied to the discharge lamp alternates set to an acoustic resonance frequency or lower. 6. The high magnetic field lighting device according to claim 3, wherein the lighting device is a separately excited control type high frequency lighting device. 7. A lighting device in which a light source is arranged in a magnetic field of 30 G or more, and a discharge lamp as a light source and an output when the discharge lamp is arranged in a magnetic field are equal to or lower than an allowable upper limit value. A lighting device for high magnetic field, comprising: a lighting device in which an output to a discharge lamp is set. 8. A lighting device in which a light source is arranged in a magnetic field of 30 G or more, the discharge device serving as a light source, and a lighting device having a DC voltage applied to the discharge lamp. Lighting device for magnetic field. 9. The lighting device inverts the polarity of the voltage applied to the discharge lamp at a predetermined cycle, and sets the cycle so long that the change in the light output due to the polarity reversal is not perceived as flicker. The illumination device for high magnetic field according to claim 8. 10. An illumination device in which a light source is arranged in a magnetic field of 30 G or more, and an incandescent light bulb is provided as a light source. 11. A lighting device for a high magnetic field, which is a lighting device in which a light source is arranged in a magnetic field of 30 G or more, and which comprises an incandescent lamp whose filament is earthquake-proofed as a light source. 12. A lighting device in which a light source is arranged in a magnetic field of 30 G or more, comprising an incandescent lamp as a light source, and a lighting device for alternating an applied voltage to the incandescent lamp at 400 Hz or more. High magnetic field lighting device. 13. A lighting device in which a light source is arranged in a magnetic field of 30 G or more, the lighting device including an incandescent lamp as a light source and a lighting device for applying a DC voltage to the incandescent lamp. Lighting device for magnetic field. 14. A lighting device in which a light source is arranged in a magnetic field of 30 G or more, the lighting device including a control unit for controlling an output to a lamp according to an external signal, and a lighting device based on an action of the magnetic field to the lamp. An illumination device for a high magnetic field, comprising: a power detection unit that gives an external signal to the control unit according to a change in lamp power. 15. The power detection section detects the output power to the lamp, and the control section controls the output so that the output power detected by the power detection section is kept substantially constant. Lighting device for high magnetic field. 16. The high magnetic field according to claim 14, wherein the power detector detects the input power, and the controller controls the output so that the input power detected by the power detector is kept substantially constant. Lighting equipment. 17. A lighting device in which a light source is arranged in a magnetic field of 30 G or more, and a lighting device including a control unit for controlling an output to the lamp according to an external signal, and at least a magnetic field around the lamp is detected. And a magnetic signal sensor for detecting a magnetic field intensity detected by the magnetic sensor, and an external signal generator for providing an external signal to the controller when the magnetic field strength detected by the magnetic sensor becomes larger than the normal environment. Lighting device for high magnetic field. 18. A lighting device in which a discharge lamp as a light source is arranged in a magnetic field of 30 G or more, and a discharge lamp of the discharge lamp is compared by comparing a detected value of at least one of an input and an output of the discharge lamp with a reference level. For a high magnetic field, comprising: an abnormality detecting unit that detects an abnormality; and a lighting device whose output is controlled in a direction to reduce output power to the discharge lamp when the abnormality detecting unit detects an abnormality in the discharge lamp. Lighting equipment. 19. A magnetic sensor that detects at least a magnetic field around a discharge lamp, and a reference level setting that sets a reference level so as to cancel out an increase in the lamp voltage from a normal environment based on the magnetic field strength detected by the magnetic sensor. The illumination device for a high magnetic field according to claim 18, further comprising: 20. The lighting device includes a control unit for controlling output according to an external signal, and the abnormality detection means sets the output power to be equal to or lower than the output power in the normal environment when the detected value before reaching the reference level becomes larger than the normal environment. 19. The high magnetic field lighting device according to claim 18, wherein an external signal to be applied is given to the control unit. 21. A lighting device provided with a lighting device arranged in a magnetic field of 30 G or more, wherein the lighting device is provided with a magnetic shield, and the lighting device for high magnetic field is provided. 22. A high magnetic field characterized by comprising at least one electromagnetic component wound with a coil and a lighting device disposed in a magnetic field of 30 G or more, wherein the electromagnetic component is magnetically shielded. Lighting equipment. 23. A lighting fixture arranged in a magnetic field of 30 G or more, wherein the lamp and the lighting device are mounted on one lighting device main body, and a part of the lighting device main body constitutes at least a magnetic shield of the lighting device. Lighting equipment for high magnetic field. 24. A plurality of lamps arranged in a magnetic field of 30 G or more, and a plurality of lighting devices for supplying power to the respective lamps.
It is characterized by comprising magnetic field detection means for detecting the ambient magnetic field of each lamp, and a management device for centrally controlling the output from the lighting device to each lamp so as to reduce the influence of the ambient magnetic field detected by the magnetic field detection means. High magnetic field lighting system.