JP2002093203A - Light source device, light source system and lighting device - Google Patents

Abstract

(57) [Problem] To provide a light source device that suppresses the shortening of the life of a lamp and efficiently outputs light having a predetermined polarization angle by a relatively simple method without increasing the size. A light emitting tube (1) is housed in a middle tube (2), the inside of the tube is kept at a vacuum, and the middle tube (2) is housed in a reflector (3). A reflection polarizing plate 5 for transmitting light having a predetermined polarization angle and reflecting light having another polarization angle is provided on a front glass 32 of the reflection mirror 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light source device, a light source system, and a lighting device using a high-pressure discharge lamp as a light source.

[0002]

2. Description of the Related Art In recent years, high-pressure discharge lamps having high brightness and high efficiency have been used as light sources for liquid crystal projectors and the like. This type of liquid crystal projector controls each color component by dividing light from a light source into three colors of RGB and then irradiating only light having a certain polarization angle to a liquid crystal panel through a polarizing plate. That is, since only light having a predetermined polarization angle that passes through the arrangement of liquid crystal molecules is recognized as its color, the light is controlled by changing the arrangement of the liquid crystal molecules.

[0003] However, in such a method, only light having a predetermined polarization angle of light emitted from the high-pressure discharge lamp can be used, so that light of other polarizations is discarded, resulting in poor efficiency. .

[0004] For this reason, Japanese Patent Application Laid-Open No. 10-172326 discloses that, out of the light emitted from a light source, only light having a predetermined polarization angle is transmitted, and light having other polarization angles is reflected. There is described a light source efficiency improving method and a high efficiency lamp device (conventional example 1) in which a reflector arranged so as to redirect light to the light source increases the temperature of the light source, thereby increasing the efficiency of the light source.

[0005]

However, when the high-efficiency lamp device described in the prior art 1 is used, the efficiency of the lamp can be increased by increasing the lamp temperature. However, the light emission of the lamp is transmitted to the arc tube and the reflecting mirror. Since the light is incident many times, the arc tube and the reflector become extremely hot.

As described above, when the temperature of the lamp is increased,
At the time of lighting, particularly at the time of horizontal lighting or in a spherical light source often raised in the description, the upper part of the lamp is locally heated, and devitrification due to an undesired reaction between the filling material and the arc tube material in the vicinity of that part is caused. There was a problem that blackening was caused by a rise in the temperature of the lamp electrode, and bursting occurred in severe cases.

[0007] Also, since the temperature of the reflecting mirror is considerably high,
It is necessary to increase the heat resistance of the reflective polarizing plate, or to increase the distance between the reflective polarizing plate and the reflecting mirror to suppress the temperature of the reflective polarizing plate from becoming high.

For this reason, there have been problems such as an expensive reflective polarizing plate or an increase in the size of the light source device.

According to the present invention, in order to eliminate such disadvantages, the temperature of the arc tube does not unnecessarily rise, the lamp is prevented from having a short life, and a light source device that can be miniaturized by using an inexpensive reflective polarizing plate. , A light source system and a lighting device.

[0010]

According to a first aspect of the present invention, there is provided a light source device comprising: a high-pressure discharge lamp luminous tube in which a discharge medium is sealed in a light-transmitting container; And a reflecting mirror having a light emitting opening and accommodating the middle tube;
A reflective polarizing plate provided in the light projecting aperture and transmitting light of a predetermined polarization angle and reflecting light of another polarization angle.

In the present invention and each of the following inventions, definitions and technical meanings of terms are as follows unless otherwise specified.

The high-pressure discharge lamp arc tube can be applied to all high-pressure discharge lamp arc tubes such as a high-pressure mercury lamp and a metal halide lamp. Accordingly, the material of the arc tube and the discharge medium to be enclosed can be appropriately selected according to the type of the high-pressure discharge lamp. In addition, other than a general high-pressure discharge lamp having electrodes,
Those that emit light by electromagnetic waves such as microwaves without electrodes are allowed.

The discharge medium may be any one which emits light by energizing the energy. For example, mercury, metal halide and rare gas can be used.

As the translucent container, a translucent ceramic made of alumina or the like may be used in addition to quartz glass. The arc tube may have a sealing portion in which an electrode is sealed. For example, in addition to a so-called double-sealed type in which a sealing portion exists on both sides of a light emitting portion, a so-called sealing portion is provided only on one side. One-sided sealing type can be adopted.

The middle tube is preferably formed entirely of a translucent material, but is not limited to this. The vacuum state means a degree of vacuum of 0.1 Pa or less, preferably 0.01 Pa or less. Also, in order to keep the degree of vacuum of the middle tube preferably during the life of the arc tube, it is also allowed to enclose a getter inside the middle tube.

Further, by covering the inner surface or the outer surface of the middle tube with an infrared reflection film or the like, it is possible to prevent the light from the luminous tube from being incident on the luminous tube again and increasing the temperature of the luminous tube unnecessarily. it can

The reflecting mirror has a function of projecting light generated from the high-pressure discharge lamp with a desired light distribution. Shapes for this purpose include shapes such as a spheroidal shape and a rotating secondary radiation curve shape, which are a light projection opening and a reflecting surface. Also,
It is also possible to increase the reflection efficiency of the reflector and increase the light utilization rate by, for example, depositing a thin multilayer reflective film on the inner surface of the reflector that houses the lamp of the reflector. In addition, a protective glass may be fixed to the light emitting opening to prevent the fragments of the lamp from being scattered in the event of damage to the lamp.

The reflective polarizing plate is provided at the light projecting opening of the reflecting mirror. When the front glass is attached to the light emitting opening, it may be attached to the outer surface or the inner surface of the front glass. The reflective polarizer transmits light of a predetermined polarization angle,
It has the function of reflecting light of other polarization angles, and allows dielectric films coated on the surface of a light-transmitting substrate such as glass, reflective polarizing films of multilayer birefringent polymer, etc. I do.

According to the first aspect of the present invention, since the inside of the middle tube is held in a vacuum and the arc tube is housed inside, the temperature of the arc tube can be suppressed from being transmitted to the reflective polarizing plate. The temperature of the reflecting mirror provided with the plate and the light projecting opening of the reflecting mirror can be reduced. Thus, an inexpensive reflective polarizing plate can be used, and an increase in the cost of the optical device can be suppressed. Further, even if the distance between the reflective polarizing plate and the arc tube is reduced, an increase in the temperature of the reflective polarizing plate can be suppressed, so that the light source device can be downsized.

Further, since the light emitted and reflected from the arc tube does not return directly to the arc tube, the temperature of the arc tube can be prevented from rising more than necessary, and the temperature of the arc tube becomes high. This can suppress the shortening of the service life.

According to a second aspect of the present invention, there is provided a light source system comprising: the light source device according to the first aspect; and light control means capable of controlling light transmitted through the reflective polarizing plate of the light source device.

As an example of well-known light suppressing means, a light suppressing means using a liquid crystal panel is known. Since light with a predetermined polarization angle is output from the light source device,
If only the deflection angle that can be controlled by the liquid crystal panel is transmitted through the light source device, a light source system that can improve the light use efficiency of the liquid crystal panel can be provided.

In addition, by using the light obtained from the light source device as at least another polarizing plate as the light suppressing means, the light can be controlled and a light source system with high light use efficiency can be provided.

According to the second aspect of the present invention, it is possible to provide a light source system having the effects of the first aspect and also to provide a light source system capable of improving light use efficiency. In addition, it is possible to perform full dimming of a high-pressure discharge lamp, which has conventionally been difficult to dimm, with a simple method, and to perform dimming control without changing the light color during dimming. ing.

According to a third aspect of the present invention, there is provided a lighting device comprising: a lighting device main body; and the light source system according to the second aspect housed in the lighting device main body.

The illuminating device may be any device that utilizes the light distribution of light having a predetermined polarization angle in a state where the high-pressure discharge lamp and the reflecting mirror are combined, and that utilizes the dimming of the high-pressure discharge lamp. , General lighting devices, projector devices, spotlight devices, automobile headlight devices, and the like.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a light source device according to the present invention will be described with reference to FIG. FIG. 1 is a cross-sectional view of the light source device of the present embodiment.

The arc tube 1 uses a ceramic metal halide lamp, and the rated lamp power is 35 W. The light emitting portion 11 of the arc tube 1 has 3 mg of mercury as a discharge medium,
Sodium iodide 0.1mg, thallium iodide 0.2m
g and other rare gases and 27k
Pa is enclosed. In addition, a pair of electrodes 12
Are sealed by the sealing portion 13. The electrode 12 is made of a refractory metal such as tungsten, and the electrode 12 is connected in series with an external lead wire 15 made of niobium. The external lead 15 and the sealing portion 13 are hermetically sealed.

The middle tube 2 is made of semi-cylindrical quartz glass. The external lead 15 of the arc tube 1 is
2 is connected in series to the molybdenum foil 23 for sealing the middle tube, and after being hermetically sealed with the middle tube sealing portion 21, an exhaust pipe (not shown) attached to the chip portion 22 of the middle tube 2. , The inside of the inner tube 2 is evacuated to a vacuum and the chip is turned off. The molybdenum foil 23 for sealing the middle tube is composed of a middle tube lead wire 24.
Are electrically connected to the base 4.

The reflecting mirror 3 includes a reflecting part 31 and a front glass part 3.
It consists of two. The reflecting portion 31 has a reflecting material (not shown) made of an aluminum vapor-deposited film having a property of reflecting light from the arc tube deposited on the inner surface. The front glass 3
Reference numeral 2 denotes a reflector 31 and a front glass portion 32 which are joined by sealing so that fragments are not scattered in the event that the arc tube 1 is damaged, and the reflector 3 is integrated.

The reflecting portion 31 of the reflecting mirror 3 facing the front glass 32 has an opening, and the middle tube 2 is inserted and connected to the base 4. A pair of electrodes 12 sealed in the arc tube 1
Are respectively connected to the base 4 via the external lead wire 15, the molybdenum foil 23 for sealing the middle tube, the support 22, and the middle tube lead wire 24.
Is electrically connected to

On the front glass 32, a reflective polarizing plate 5 is attached. During the lighting of the arc tube, the temperature of the outer surface of the front glass 32 was measured to be 80 ° C. Therefore, the reflective polarizing plate 5 can be directly applied.

The operation of the first embodiment will be described.
In the light source device of the present embodiment, since the periphery of the arc tube 1 is kept in a vacuum by the middle tube 2, the space between the light emitting section 11 and the middle tube 2 is insulated during the lighting of the arc tube 1. For this reason,
The temperature of the front glass 32 can be reduced, and the reflective polarizing plate 5 can be attached to the front glass 32. This suppresses an increase in the size of the light source device.

In the light source device configured as described above, only the light having a predetermined polarization angle is emitted to the outside of the reflective polarizing plate 5 from the light emitting tube 1. Light having other deflection angles is reflected by the reflective polarizing plate 5 after passing through the front glass 4 and further reflected mainly by the reflecting portion 31 of the reflecting mirror to change its polarization angle again to the reflective polarizing plate 5. Heading. Although there is a loss of light at the middle tube 2, the reflection portion 31, the reflection polarizing plate 5, etc., in this way, most of the light finally passes through the reflection polarizing plate 5 and only a certain polarization angle is changed. The light is provided outside the light source device.

According to experiments, the light source device configured as described above had a light use efficiency of 75%. In addition, all light from the light source device has only a predetermined polarization angle component. This was able to increase the efficiency by 25% compared to the conventional light source device in which the light utilization factor was 50% when the polarization plane was placed at a position distant from the lamp.

FIG. 2 shows a second embodiment of the light source device of the present invention.
This will be described with reference to FIG. FIG. 1 is a cross-sectional view of the light source device of the present embodiment. The same parts as those in FIG. 1 are denoted by the same reference numerals.

The arc tube 10 uses a single-sealed metal halide lamp, and the rated lamp power is 150 W.
The light emitting portion 11 of the arc tube 1 has mercury 26 as a discharge medium.
mg, 1.56 mg of scandium iodide, 0.48 mg of thallium iodide, and a predetermined rare gas. In addition, a pair of electrodes 12
Are sealed by the sealing portion 13. The electrode 12 is made of an alloy of a refractory metal such as tungsten and rhenium. The electrode 12 is connected in series with the molybdenum foil 14 and the external lead 15. The sealing portion 13 is made of the molybdenum foil 14
Part is hermetically sealed.

The middle tube 2 is made of a semi-cylindrical quartz glass. After the external lead wire 15 of the arc tube 1 is connected to the molybdenum foil 23 for sealing the middle tube and is hermetically sealed with the middle tube sealing portion 21, the exhaust gas attached to the chip portion 22 of the middle tube 2 is exhausted. The inside of the middle tube 2 is evacuated from a tube (not shown) to be chipped off. The molybdenum foil 23 for sealing the middle tube is connected to the middle tube lead wire 24 and is electrically connected to the base 4.

The reflecting mirror 3 includes a reflecting part 31 and a front glass part 3.
It consists of two. The reflector 31 has a reflective material (not shown) having a property of reflecting light from the arc tube deposited on the inner surface thereof. Further, the front glass 32 has a lens function to make the light emission of the arc tube 1 a more desired light distribution. The reflection part 31 and the front glass part 32 are joined by sealing, and the reflection mirror 3 is integrated.

The interior of the reflecting mirror 3 is sealed with nitrogen at a pressure of 52 kPa at room temperature to seal the reflecting mirror 3.

The base 4 is attached to the reflecting portion 31 of the reflecting mirror 3 facing the front glass 32. The base 4 is electrically connected to the base 4 via a pair of electrodes 12 sealed in the arc tube 1, a molybdenum foil 14 of the arc tube, an external lead 15, a molybdenum foil 23 for sealing a middle tube, and a middle tube lead 24. Connected.

Also in the second embodiment, in the light source device configured as described above, only a predetermined polarized light of the light emitted from the arc tube 1 is irradiated to the outside of the reflective polarizing plate 5. After passing through the front glass 4, the light having other deflection angles is reflected by the reflective polarizing plate 5, and is further reflected mainly by the reflecting portion 31 of the reflecting mirror to change its polarization angle again to the reflective polarizing plate 5. Heading. Although there is a loss of light in the middle tube 2, the reflection portion 31, the reflection polarizing plate 5, etc., in this way, most light finally passes through the reflection polarizing plate 5 and has only one certain polarization angle. Light is provided outside the lamp.

In the light source device configured as described above, the light utilization efficiency can be improved by 20% as compared with the case where the polarizing plate is arranged at a position away from the lamp as in the conventional light source device.

Next, an embodiment of the light source system of the present invention will be described with reference to FIG. FIG. 3 is a block diagram of a light source system using the light source device of the first embodiment as the light source device 6. The same parts as those in FIG. 1 are denoted by the same reference numerals.

In the figure, the light source device 6 houses the ceramic metal halide lamp (not shown) shown in the first embodiment inside the middle tube 2. The reflection polarizing plate 5 is provided on the outer surface of the front glass 32 of the reflection mirror 3.

The light source device 6 is housed in the light source system main body 7, and a rotatable polarizing device 71 is installed on the opening side of the reflecting mirror 3. This polarization device 71 can be rotated by a polarization control device 72.

The operation of the light source system will be described. Since the light emitted from the light source device 6 is only light having a predetermined deflection angle, the light emitted from the light source system main body 7 is controlled by the angle of the polarizing device 71. Therefore, the amount of light emitted from the light source system main body 7 is controlled by changing the angle of the polarization device 71 by the polarization control device 72.

By using this light source system, the dimming of a high-pressure discharge lamp, which has conventionally been difficult to dimm, can be performed by a relatively simple method. In addition, since the dimming control of light is not based on the conventional lamp input power, dimming can be performed without changing the light color. Further, since the light source device 6 can be made relatively small, this light source system also becomes small.

Since light control can be performed without changing the light color, this light source system is preferably applied to store lighting, spotlights in studios, and the like.

A fourth embodiment of the present invention will be described with reference to FIG. In the present embodiment, the light source device 6 of the first embodiment is used.
The liquid crystal projector 8 is formed by using. That is, the liquid crystal projector 8 includes the arc tube 1 connected to the high pressure discharge lamp lighting device BT and the liquid crystal driving unit 52.
Liquid crystal display panel 83 driven by the light source device 6 and the light passing through the liquid crystal display panel 83 to irradiate the light from the light source device 6
, A mirror 86 and a lens 87, lighting means BT, light source device 6, liquid crystal driving means 8
2. The screen 8 accommodates the liquid crystal display panel 83 and the optical system 85 and transmits the light transmitted through the liquid crystal display panel 83 to the screen 8.
4 is an example of a liquid crystal projector 8 including a housing 89 in which an opening 88 for projecting light into the light source 4 is formed.

In the liquid crystal projector according to the present embodiment, the light emitted from the light source device 6 irradiates only light having a predetermined deflection angle, and its efficiency is improved. Light utilization efficiency can be further improved.

Therefore, a liquid crystal projector having a bright screen can be provided by a relatively simple method without increasing the size.

[0053]

According to the first aspect of the present invention, an inexpensive reflective polarizing plate can be used, and an increase in the cost of the optical device can be suppressed. Further, even if the distance between the reflective polarizing plate and the arc tube is reduced, an increase in the temperature of the reflective polarizing plate can be suppressed, so that the light source device can be downsized.

Further, since the light emitted and reflected from the arc tube does not return directly to the arc tube, it is possible to prevent the temperature of the arc tube from unnecessarily rising, and the temperature of the arc tube becomes high. This can suppress the shortening of the service life.

According to the invention of claim 2, in addition to the effect of claim 1, a light source system capable of further improving the light use efficiency can be provided. In addition, the dimming of a high-pressure discharge lamp, which has been difficult to dimming in the past, can be fully dimmed in a wide range by a simple method, and the dimming does not change with the dimming. The light control effect is achieved.

According to the third aspect of the invention, it is possible to provide a lighting device having the effect of the second aspect.

[Brief description of the drawings]

FIG. 1 is a sectional view of a light source device according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a light source device according to a second embodiment of the present invention.

FIG. 3 is a block diagram of a light source system according to a third embodiment of the present invention.

FIG. 4 is a block diagram of a liquid crystal projector according to a fourth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Arc tube 2 ... Middle tube 3 ... Reflector 4 ... Base 5 ... Reflective polarizing plate

Claims (3)

[Claims] 1. A high pressure discharge lamp luminous tube having a discharge medium sealed in a translucent container; a middle tube containing the luminous tube and sealing the inside thereof in a vacuum; A light source, comprising: a reflecting mirror for accommodating a tube; and a reflecting polarizing plate provided in the light projecting aperture and transmitting light of a predetermined polarization angle and reflecting light of another polarization angle. apparatus. 2. A light source system comprising: the light source device according to claim 1; and light control means capable of controlling light transmitted through the reflective polarizing plate of the light source device. 3. A lighting device comprising: a lighting device main body; and the light source system according to claim 2 housed in the lighting device main body.