JP2003157703A - Bulb-type fluorescent lamp - Google Patents

Abstract

(57) [Summary] [Problem] To further increase the adaptability of a lamp appliance by further miniaturizing a lamp shape, and to guarantee a life of 6000 hours or more.
A bulb-type fluorescent lamp having a high lamp efficiency of 66 lm / W or more and further reducing power consumption is obtained. SOLUTION: In the bulb-type fluorescent lamp, (i) the outer diameter of the outer bulb 24 is 60 mm to 70 mm and the outer diameter of the bottom is 5 mm.
0 mm to 58 mm, total length 73 mm to 85 mm, (ii)
The outer diameter of the resin case 25 is 50 mm to 58 mm, (iii)
The total length of the bulb-type fluorescent lamp is 148 mm or less, and the fluorescent arc tube 1 has a distance between the electrodes of 450 mm to 540 m.
m and the inner diameter of the tube are in the range of 8.0 mm to 10.0 mm, and the lamp is operated in a region having a lamp current value of 220 mA or less.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-ballasted fluorescent lamp.

[0002]

2. Description of the Related Art In the era of energy saving, development and deployment of highly efficient fluorescent bulbs that replace low efficiency general bulbs have been actively promoted in the lighting field.

As conventional light bulb type fluorescent lamps, three kinds of general light bulbs 40 W, 60 W and 100 W corresponding to luminous flux have been developed and developed. In this case, the power consumption of each product type is about 10 W, 14 W, and 25 W, which is about a quarter of the value of a general light bulb, and it can be seen that a high energy saving effect is obtained. Initially, the development of low wattage products equivalent to general light bulbs of 40 W and 60 W was promoted, and recently, the luminous flux of 15 W
A high wattage product is being developed to replace the 20 lm general light bulb 100W. In the development of these varieties, in order to promote the replacement of small-sized general light bulbs, it is required that the so-called light-bulb equipment adaptation rate is high so that the general light-bulb equipment can be lit as it is, and for this reason, downsizing of the lamp shape is particularly promoted. Came.

The conventional light bulb type fluorescent lamp is shown in FIGS. 9 and 1.
As shown in FIG. 0, the fluorescent light emitting tubes 28 and 29, the electronic lighting circuit sections 30 and 31, the outer tube bulbs 32 and 33, the resin cases 34 and 35, and the bases 36 and 37 are assembled. Here, comparing the lamp shapes of the general electric bulb and the conventional electric bulb type fluorescent lamp, the outer diameter of the eggplant-shaped outer bulb of the general electric bulb is 60 mm and the total length of the lamp is 110 m.
For the original low wattage type, the outer tube valve 32 as shown in FIG.
mm and the total length Lo of the lamp is around 130 mm, which is considerably small, and therefore, the high adaptability of the light bulb fixture is as high as about 70%.

[0005]

The general electric bulb 100W, which is one of the main products, is one of the main products for promoting the energy saving by popularizing the electric bulb type fluorescent lamp which replaces the general electric bulb in the future.
High-watt bulb fluorescent lamps that replace
There is a demand for further miniaturization (around 5W) to increase the adaptability of the bulb equipment.

However, as for the high wattage type which replaces the general electric bulb 100W, the outer tube valve 33 has a tubular shape as shown in FIG. 10, the outer diameter Do is 70 mm, and the total lamp length Lo is about 150 mm, which is still small. It is insufficient, and the adaptation rate of the light bulb fixture is at a low level of about 40%.

[0007] Therefore, prior to the development of such a high wattage bulb type fluorescent lamp, the present inventor first examines the shapes and dimensions of various general light bulb appliances to determine the lamp shape surface for increasing the adaptability of the lamp to the bulb appliances. I examined the necessary conditions. As a result, (i) the outer bulb has an eggplant shape similar to that of a general electric bulb as shown in FIG.
(Ii) At the same time, it has been found that it is a necessary condition to reduce the outer diameter of the resin case. As a result, it is possible to prevent the shoulder portion of the resin case of the conventional high wattage type from hitting the light bulb device reflector, and increase the adaptability of the light bulb device. On the other hand, regarding the total length of the lamp, even if the total length is relatively long, it can be applied as long as it is an open-type light bulb device, but it is necessary to maintain the appearance preference when the lamp is attached to the device, and at least the conventional high wattage type It can be said that it is desirable that the size is less than or equal to the size. In conclusion, (i) the outer diameter Do of the eggplant-shaped outer bulb 32 is 70 mm and the bottom outer diameter Di is 58 m as the upper limit of the lamp size of each high-watt fluorescent lamp.
m and total length Li is 85 mm, (ii) resin case outer diameter Dc is 58 mm, and (iii) lamp total length Lo is 148.
It has been found that if the mm is realized, the bulb fitting rate of the lamp can be increased to about 70%, which is equivalent to that of the low wattage type.

The lower limit of the lamp size is specified under the condition that a predetermined rated value can be obtained with respect to various characteristics of the lamp including the life as described later.

Next, as a preliminary development, the inventor of the present invention made a prototype of a compact high-watt fluorescent lamp of the above-mentioned lamp size, and measured various lamp characteristics including the life thereof. As a result, the first problem in the development of high wattage products with such a power consumption of around 25 W is that the lamp has a short life, and the main factors that bring about this are: (i) excessive fluorescent arc tube. Luminous flux deterioration during lamp life due to temperature rise is large. (Ii) Next, the temperature of the electronic parts of the electronic lighting circuit section and the PC resin board mounted in the narrow resin case rises excessively, causing circuit malfunction. It turned out that there are two. In particular, the above factor (ii)
In this case, the capacitor parts are often defective, and the lamp reaches the end of its life in a relatively short time. In order to popularize a high-wattage, small-sized compact fluorescent lamp replacing the general electric bulb 100W in the future, it is necessary to guarantee a life of 6000 hours or more, which is the same as the conventional lamp.

Furthermore, in order to further promote energy saving for global environment protection, the power consumption is 25
There has been a demand for a high-efficiency, high-wattage bulb-type fluorescent lamp with a reduction of around W. As a numerical target, the general light bulb 100
In order to obtain a lamp luminous flux of 1520 lm equivalent to W, it is desired that the lamp power consumption is 23 W or less compared to the conventional value of 25 W and the lamp luminous efficiency is 66 lm / W or more.

The present invention provides a highly efficient, high-wattage fluorescent lamp of a high efficiency, which has a higher lamp adaptability by further downsizing the lamp shape, guarantees a lamp life of 6000 hours or more, and has further reduced power consumption. The purpose is to provide a lamp.

[0012]

According to a first aspect of the present invention, there is provided a bulb-shaped fluorescent lamp in which a plurality of U-shaped glass tubes are bridge-joined and a pair of electrodes are provided inside both ends of the fluorescent light-emitting tube, and an electron. A light bulb shaped fluorescent lamp comprising a lighting circuit portion, an outer bulb, a resin case and a base, wherein the light bulb shaped fluorescent lamp has (i) an outer diameter of 60 in the outer bulb.
mm-70 mm, the bottom outer diameter is 50 mm-58 mm and the total length is 73 mm-85 mm, (ii) in the resin case, the outer diameter is 50 mm-58 mm, (iii) the bulb total length of the bulb-shaped fluorescent lamp is 148 mm or less, The fluorescent arc tube has a distance between electrodes of 450 mm to 540 mm and a tube inner diameter of 8.0 mm to 10.0 mm.
It has a configuration in which it is operated in a region where the lamp current value is 220 mA or less.

As a result, the shape of the lamp is further reduced, and the applicability of the light bulb fixture is increased to 70% or more.
The life of 00 hours or more and the high lamp efficiency of 66 lm / W or more are realized, and the lamp power consumption is further reduced.

According to a second aspect of the present invention, in the light bulb shaped fluorescent lamp according to the first aspect, the distance between the electrode of the fluorescent light emitting tube and the PC resin substrate of the electronic lighting circuit section is 25 mm to 4 mm.
It has a structure in the range of 0 mm.

As a result, in particular, an excessive rise in temperature of the electronic components of the electronic lighting circuit section and the PC resin substrate is suppressed, circuit malfunctions, etc. are prevented, and a life of 6000 hours or more is guaranteed.

According to a third aspect of the present invention, in the light bulb type fluorescent lamp according to the first aspect, as a buffer gas for the fluorescent arc tube, a (Ne + Ar) mixed gas having a Ne composition ratio of 75% or less is mainly sealed. Have

As a result, it is possible to obtain the effect that the lamp efficiency is further enhanced even if the inner diameter of the tube is the same.

According to a fourth aspect of the present invention, in the light bulb shaped fluorescent lamp according to the first aspect, the fluorescent light emitting tube has a structure in which four U-shaped glass tubes are integrated.

As a result, it is possible to obtain an effect that the lamp shape can be further downsized and the lamp efficiency can be easily improved.

According to a fifth aspect of the present invention, in the light bulb type fluorescent lamp according to the first aspect, the lamp current value is 210 m.
It has a configuration to be operated in the area of A or less.

As a result, it is possible to obtain an effect that the lamp efficiency is further enhanced and the lamp power consumption is further reduced.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIG.
~ It demonstrates using FIG.

FIG. 1 and FIG. 2 show an arc tube development view of a light bulb type fluorescent lamp and a configuration diagram of a completed lamp product, respectively, which is an embodiment of the present invention. In the envelope 2 of the fluorescent light emitting tube 1 of FIG. 1, four U-shaped glass tubes 3, 4, 5 and 6 are joined by so-called bridge joints 7, 8 and 9 so as to form a series of discharge paths. It consists of things. A pair of tungsten coil electrodes 12 and 13 is held by lead wires 14 and 15 at the respective tube ends 10 and 11 of the U-shaped glass tubes 3 and 6 which are the ends of the discharge path. U-shaped glass tube 3,
Phosphors 16 are applied to the main parts of the inner surfaces of 4, 5, and 6, and in this case, the phosphors 16 are three types of rare earth phosphors of red, green, and blue emission, Y ₂ O, respectively. ₃ :
Eu, LaPO _4: Ce, Tb and BaMg ₂ Al ₆ O
₂₇ : A mixture of Eu and Mn was used.

Inside the envelope 2 of the fluorescent arc tube 1, two main amalgams 17, 18 and four auxiliary amalgams 1 are provided.
9, 20, 21, and 22 are arranged, and a rare gas such as argon and neon is further filled as a buffer gas.
In this case, the main amalgams 17 and 18 are Bi-Pb.
-Sn-Hg grains (total amount 110 mg, Hg ratio 1.5%)
As the auxiliary amalgams 19, 20, 21, and 22, stainless steel mesh plated with In was used.

On the other hand, as a finished product of the bulb-type fluorescent lamp, as shown in FIG. 2, the fluorescent lighting tube 1 is used to assemble the electronic lighting circuit section 23, the outer tube bulb 24, the resin case 25 and the base 26. It consists of The electronic lighting circuit section 23 is composed of a PC resin board 27 on which electronic components are mounted. Here, as the upper limit of the lamp size, (i) the outer diameter Do of the outer tube valve 24 is 70
mm, bottom outer diameter Di is 58 mm, and total length Li is 85 m
m, (ii) the outer diameter Dc of the resin case 25 is 58 mm,
(Iii) The total lamp length Lo is set to 148 mm, which is the above-mentioned bulb device adaptation rate of 7 which is the object of the present invention.
This corresponds to the upper limit of the smaller lamp size for achieving 0%. Further, as the electronic lighting circuit unit 23, one having a basic configuration of a series inverter system is used, and its circuit conversion efficiency (ratio of output power to circuit input power) is 91%.

In developing the intended high-wattage bulb type fluorescent lamp, the present inventor first investigated fluorescent luminous tubes having various configurations based on the prior art in order to specify the fluorescent luminous tube to be used. As a result, in the fluorescent arc tube 1 composed of four U-shaped glass tubes, (i) it is relatively easy to downsize the lamp shape, and (ii) the discharge path between both electrodes is long, and the luminous efficiency of the lamp is accordingly increased. It was decided that it is suitable because it is expected to increase and the power consumption can be reduced.

The inventor of the present invention relates to a high-wattage bulb-type fluorescent lamp using the fluorescent arc tube 1 consisting of four U-shaped glass tubes shown in FIG. 1 in order to increase the adaptability of the bulb fixture. Even with the miniaturization of the shape, we started to study to guarantee a life of 6000 hours or more. in this case,
As described above, the problems of shortening the lamp life in the miniaturization of the lamp shape are mainly (i) an increase in luminous flux deterioration due to an excessive temperature rise of the fluorescent arc tube, and (ii) an electronic component of an electronic lighting circuit unit and a PC. Since it is caused by the circuit malfunction due to the excessive temperature rise of the resin substrate, the study for suppressing the temperature rise was conducted. As a result, the following was found.

(A) The main parameters that regulate the temperature of the fluorescent arc tube, the electronic components of the electronic lighting circuit section, and the PC resin substrate are the fluorescent arc tube 1 provided inside the outer bulb 24.
The amount of heat radiation of. The fluorescent light emitting tube of a normal light bulb type fluorescent lamp consumes about 90% of the power consumption of the lamp, and about 75% of the power consumption of the fluorescent light emitting tube is dissipated as heat. Therefore, the heat radiation amount of the fluorescent light emitting tube basically depends on the lamp power consumption, and it can be said that the increase of the heat radiation amount is unavoidable in a high wattage product of around 25 W. Also,
As will be described later, the temperature of the electronic lighting circuit portion is greatly influenced by the heat radiation amount of the pair of electrode end portions which are close to the circuit and have a high power consumption rate.

(B) The secondary parameter that regulates the temperatures of the electronic component and the PC resin substrate is so-called circuit loss, which is the power consumption of the electronic lighting circuit unit itself.
In this case, the circuit loss basically depends on the lamp current rather than the lamp power consumption, and it can be said that the reduction of the lamp current reduces the circuit loss and lowers the temperatures of the electronic component and the PC resin substrate. However, recently, the circuit loss of the electronic lighting circuit section is gradually reduced due to (i) progress of improved design of electronic circuit, (ii) reduction of loss of electronic parts, etc., and the minimum limit of less than 10% of lamp power consumption. Has been suppressed to the range of. Therefore, it can be said that it is difficult to further reduce the circuit loss.

From the above, the fluorescent light emitting tube, the electronic component and the P
As a basic method for suppressing the excessive temperature rise of the C resin substrate, it has been clarified that the heat radiation amount of the fluorescent light emitting tube is mainly suppressed.

With respect to the high-wattage bulb-type fluorescent lamp using the fluorescent light emitting tube 1 of FIG. 1, in order to suppress the heat radiation amount of the fluorescent light emitting tube 1, first, the power consumption itself of the fluorescent light emitting tube 1 may be reduced. This means that the luminous efficiency of the fluorescent light emitting tube 1, that is, the lamp itself is improved, and is exactly equivalent to the further reduction of the lamp power consumption for energy saving which is another object of the present invention. ing.

The high-wattage bulb-type fluorescent lamp having a luminous flux of 1520 lm, which is an object of the present invention, has a smaller lamp shape as described above, and therefore the fluorescent arc tube 1 to be used has an inner diameter of about 10.5 mm of that of the conventional lamp. It gets thinner. in this case,
The present inventor has speculated that the main parameter that affects the luminous efficiency of such a lamp is the lamp current. That is, in the region where the tube inner diameter is thin and the lamp current density is high, the luminous flux of the fluorescent light emitting tube 1 has a remarkable saturation characteristic with respect to the increase of the lamp current, so that it can be said that the lamp efficiency decreases as the lamp current increases. Therefore, first, an experiment for defining a lamp current region that achieves a lamp efficiency of 66 lm / W or more, which is an object of the present invention, and then, for clarifying a relevant range of various parameters of the fluorescent light emitting tube 1 to which the lamp efficiency is related. went.

Specifically, first, the lamp efficiency and life characteristics were measured when the inner diameter Le which mainly affects the lamp current was changed while keeping the inter-electrode distance Le of the fluorescent light emitting tube 1 constant.

In this measurement, a typical lamp capable of satisfying a light bulb appliance adaptation rate of 70% or more, which is the object of the present invention, has a lamp size smaller than the above upper limit as a typical lamp (i) eggplant-shaped outer bulb. The outer diameter Do of 24 is 65 mm,
Bottom outer diameter Di 54 mm and total length Li 79 mm,
(Ii) The outer diameter Dc of the resin case 25 is 54 mm, (ii
i) The total lamp length Lo was set to 143 mm, while the inter-electrode distance Le of the fluorescent light emitting tube 1 was set to 490 mm, which is a value adapted to the lamp size. As a rare gas of the buffer gas, standard Ar gas was filled at 3 Torr. As a result of this measurement, the following was found.

(A) As shown in FIG. 3, as the inner diameter of the fluorescent arc tube 1 becomes smaller, the lamp current (indicated by the broken line in FIG. 3) decreases almost monotonically, and in addition, the lamp efficiency (indicated by the solid line in FIG. 3). (Indicated by), and therefore the lamp luminous flux value 1520
Lamp power consumption is reduced when lm is obtained. Here, in order to obtain the lamp efficiency of 66 lm / W or more, which is the object of the present invention, the inner diameter of the lamp tube is in the range of 10.0 mm or less, which corresponds to the region of 220 mA or less in the lamp current. In this region, a lamp having a lamp luminous flux of about 1520 lm can be obtained even if the lamp power consumption is 23 W or less, which is lower than the conventional value of about 25 W. Further, it is more preferable that the lamp current is 210 mA or less. At this time, for example, the lamp power consumption is 22 W and the lamp efficiency is 68 lm /
It becomes W, and a lamp having a target luminous flux of 1520 lm is obtained.

(B) FIG. 4 shows the luminous flux maintenance rate at a lamp life of 6000 hours with the tube inner diameter changed in FIG. 3 (luminous flux at 6000 hour lighting / luminous flux at 100 hour lighting × 100%).
Indicates. A light bulb type fluorescent lamp has a luminous flux maintenance factor of 60% and is defined as having an end of life.
To guarantee 000 hours, the inner diameter of the lamp tube is 8.0 mm
It is necessary to set within the above range. This is because when the tube inner diameter is less than 8.0 mm, the tube wall load of the fluorescent light emitting tube 1 is increased, the tube wall temperature is excessively increased, and the luminous flux deterioration of the phosphor 16 is increased.

Next, a study was conducted to define the range of the inter-electrode distance Le of the fluorescent light emitting tube 1. In this case, the distance L between the electrodes
As for the upper limit value of e, the outer diameter bulb 24 (outer diameter Do is 70 mm, bottom outer diameter Di is 58 mm, and total length Li is 8) of the fluorescent light emitting tube 1 having the upper limit value of 10.0 mm is the upper limit value of the lamp size.
It corresponds to the longest value that can be installed inside (5 mm), and it was found from the result of the study by the present inventor that this upper limit value can be defined as 540 mm.

On the other hand, in order to define the lower limit value of the inter-electrode distance Le, the lower limit value of the inner diameter of the tube is 8.0 mm and the upper limit value is 1.
Lamps having different Le values for 0.0 mm were manufactured as prototypes and the lamp characteristics including the life were measured. As the buffer gas, the same standard Ar gas as above was used at 3 Torr.
Enclosed.

As a result, as shown in FIGS. 5 and 6, respectively, (i) the lamp current increases as the inter-electrode distance Le becomes shorter regardless of the inner diameter of the tube, and (ii) accordingly, the lamp efficiency (solid line in FIG. 6). It was found that the luminous flux maintenance factor (shown by a broken line in FIG. 6) at a lifetime of 6000 hours both decreases. The distance Le between the electrodes is 450
In the range of mm or less, the lamp efficiency 66 which is the object of the present invention.
It is not possible to obtain lm / W and a life of 6000 hours.

Summarizing the above results, as the first means for suppressing the heat radiation amount of the fluorescent light emitting tube for realizing the high-wattage bulb fluorescent lamp aimed at by the present invention, (i) the electrode of the fluorescent light emitting tube It has been clarified that the distance Le may be set to 450 mm to 540 mm, the tube inner diameter may be set to 8.0 mm to 10.0 mm, and (ii) the lamp current is set to 220 mA or less.

Further, a lamp in which a mixed gas (Ne 50% + Ar 50%) was enclosed as a buffer gas in place of the standard Ar gas was prototyped, and changes in the lamp characteristics depending on the type of buffer gas were investigated. As a result, as shown in FIG.
In a lamp in which a mixed gas of 50% + Ar50%) is filled at 3 Torr, the lamp current (shown by the broken line in FIG. 7) is lower than that in the case where Ar gas is filled in the same tube inner diameter, and the lamp efficiency (in the solid line in FIG. 7). (Shown) was found to be higher. For example, the upper limit of the inner diameter of the pipe is 10.0 mm
In, a lamp current of about 210 mA and a lamp efficiency of about 68 lm / W were obtained. On the other hand, with respect to the lamp life characteristic, although the lamp current decreased with the same tube inner diameter, a life characteristic showing a luminous flux maintenance factor almost similar to that of the lamp in which Ar gas was sealed in FIG. 4 was obtained. However, in a lamp in which the Ne mixing ratio is increased to 75% or more, the electron emitting material filled in the tungsten coil electrodes 12 and 13 is heavily worn during the life, and the life of 6000 hours cannot be guaranteed.

From the above, in the high-watt electric bulb type fluorescent lamp newly aimed at by the present invention, (Ne +
It has been clarified that the use of Ar) mixed gas is an effective means for further improving the lamp efficiency even if the tube inner diameter is the same.

In the above, as described above, the upper limit value of the inner diameter of the fluorescent light emitting tube 1 is 10.0 mm and the distance between the electrodes Le.
The outer diameter Do of the outer pipe valve 24 is 70 mm and the bottom outer diameter Di is 58 mm.
And the total length Li corresponds to 85 mm. Here, considering the lower limit of the dimension of the outer tube valve 24,
This corresponds to the combination of the tube inner diameter of the fluorescent light emitting tube 1 and the inter-electrode distance Le of the values of 9.3 mm and 450 mm, respectively. From this, the lower limit values of the outer tube bulb 24 are the outer diameter Do of 60 mm and the bottom outer part, respectively. It was found that the diameter Di corresponds to 50 mm and the total length Li corresponds to 73 mm. Summarizing the above, the dimensions of the lamp shape are (i) the outer tube bulb 24 has an outer diameter Do of 60 mm to 70 m.
m, bottom outer diameter Di is 50 mm to 58 mm, and total length Li
Is 73 mm to 85 mm, (ii) the outer diameter Dc of the resin case 25 is 50 mm to 58 mm, and (iii) the total lamp length Lo.
Is in the range of 148 mm or less. On the other hand, the dimensions of the fluorescent arc tube 1 are such that the inter-electrode distance Le is 450 mm to 540 m.
m and the inner diameter of the tube are in the range of 8.0 mm to 10.0 mm.

In the above, the reduction of the power consumption itself was examined in order to suppress the heat radiation amount of the fluorescent light emitting tube 1 which regulates the temperatures of the electronic parts of the fluorescent light emitting tube 1 and the electronic lighting circuit section 23 and the PC resin substrate 27. . On the other hand, in the bulb-type fluorescent lamp having the configuration shown in FIG. 2 as described above, the heat radiation amount of the pair of electrode portions of the fluorescent light emitting tube 1 is determined by the electronic lighting circuit portion 2.
3 promotes the temperature rise of the electronic components and the PC resin substrate 27, which also contributes to the short life of the lamp.

Here, the present inventor has examined specific means for suppressing the temperature rise of the electronic component and the PC resin substrate 27 due to the heat radiation amount of the electrode portion. In this case, the maximum temperature of the PC resin substrate 27 when the lamp was lit was specified to be 130 ° C. or less and examined as a specific standard value in the lamp development regarding the temperature of the electronic component and the PC resin substrate 27.
If this standard value is satisfied, the life of the electronic circuit intended by the present invention can be guaranteed to be 6000 hours or more.
Further, in the present experiment, as a typical lamp meeting the object of the present invention based on the above results, the lamp dimensions are (i) the outer tube valve 24 has an outer diameter Do of 65 mm, a bottom outer diameter Di of 54 mm and a total length Li of 79 mm, (Ii) The outer diameter Dc of the resin case 25 is 54 mm, and (iii) the total lamp length Lo is 143.
mm, on the other hand, the size of the fluorescent arc tube 1 is the distance between electrodes Le49.
Those set to 0 mm and a tube inner diameter of 9.1 mm were used. The lamp was operated at a lamp current of 210 mA and exhibited a lamp efficiency of 68 lm / W with a power consumption of 22 W.

As a result of this examination, one of the main parameters that influence the temperature of the PC resin substrate 27 is as follows:
A pair of tungsten coil electrodes 12, 1 of the fluorescent light emitting tube 1.
3 was found to be the distance Lp between the PC resin substrate 27.

FIG. 8 shows the maximum temperature Tm of the PC resin substrate 27.
And the distance Lp. The maximum temperature Tm was measured at room temperature of 25 ° C. by turning on the lamp in an open type appliance for a general electric bulb 100W. From FIG. 8, the maximum temperature Tm of the PC resin substrate 27 decreases at a rate of about 0.8 to 1.2 ° C./mm as the distance Lp increases. It is understood that Lp needs to be at least 25 mm or more. Such a large change in the maximum temperature Tm depending on the distance Lp is
(I) The power consumption of the electrodes 12 and 13 is about 2.5 W, which corresponds to about 12% of the total lamp power consumption of 22 W, and (ii)
The electrodes 12 and 13 in which such electric power is locally consumed are PCs.
It can be said that it is close to the resin substrate 27. It is desirable that the distance Lp be longer than 25 mm so as to have a margin in order to guarantee a life of 6000 hours under severe actual use conditions. On the other hand, if the distance Lp is set too long, it is preferable. There are restrictions in terms of obtaining the desired smaller lamp size. According to the examination result of the present inventor, the distance L
It was defined that p should be in the range of 25 mm to 40 mm. That is, within this range, the maximum temperature of the PC resin substrate 27 can be maintained at the standard value of 130 ° C. or less, and a smaller lamp size can be realized.

The tungsten coil electrodes 12 and 13
To increase the distance Lp between the PC resin substrate 27 and
Distance Lp between the tube end of the fluorescent light emitting tube 1 and the PC resin substrate 127
Either (1) or (ii) the tube end of the fluorescent light emitting tube 1 and the distance Lp2 between the tungsten coil electrodes 12 and 13 or both may be adjusted. However, in actual lamp design, it is more preferable to adjust both distances Lp1 and Lp2.

On the basis of the above results, as a typical lamp which finally fulfills the purpose of the present invention, in addition to the above lamp size and fluorescent light emitting tube size, a lamp prototyped with a distance Lp set to 32 mm is a fluorescent lamp. It was confirmed that both the tube 1 and the electronic lighting circuit section 23 normally operate with a life of 6000 hours or more.

As described above, by setting the dimensions of the lamp and the fluorescent arc tube and the operating lamp current value within a reasonable range according to the present invention, the lamp shape is further miniaturized, and the life of 6000 hours or more and 66 lm are achieved. A high-watt fluorescent lamp having a high lamp efficiency of / W or more can be obtained.

[0051]

As described above, according to the present invention, the shape of the lamp is further miniaturized to improve the adaptability of the light bulb fixture, and the life is extended to 6000 hours or more and the high lamp efficiency is 66 lm / W or more. It is possible to provide a high-wattage bulb-type fluorescent lamp having the above-mentioned characteristics and further reducing power consumption.

[Brief description of drawings]

FIG. 1 is a development view of a fluorescent light emitting tube of a light bulb type fluorescent lamp according to an embodiment of the present invention.

FIG. 2 is a partially cutaway front view of a bulb-type fluorescent lamp according to an embodiment of the present invention.

FIG. 3 is a diagram showing the relationship between the inner diameter of a fluorescent light emitting tube and various lamp characteristics.

FIG. 4 is a diagram showing the relationship between the inner diameter of the fluorescent light emitting tube and the luminous flux maintenance factor of the lamp.

FIG. 5 is a diagram showing the relationship between the tube inner diameter and the lamp current when the distance between the electrodes of the fluorescent arc tube is used as a parameter.

FIG. 6 is a diagram showing a relationship between a tube inner diameter and a lamp luminous flux maintenance rate when a distance between electrodes of a fluorescent light emitting tube is used as a parameter.

FIG. 7 is a diagram showing changes in lamp characteristics due to a (Ne + Ar) buffer gas in a fluorescent arc tube.

FIG. 8 is a diagram showing changes in the maximum temperature of the PC resin substrate with respect to the distance Lp between the electrode and the PC resin substrate.

FIG. 9 is a partially cutaway front view of a conventional bulb-type fluorescent lamp provided with an eggplant-shaped outer bulb.

FIG. 10 is a partially cutaway front view of a conventional bulb-type fluorescent lamp having a tubular outer bulb.

[Explanation of symbols]

1 Fluorescent tube 12, 13 electrodes 23 Electronic lighting circuit section 24 Outer pipe valve 25 resin case 27 PC resin board

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hiroki Nakagawa             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. F-term (reference) 5C039 HH02 HH03 HH04 HH05                 5C043 AA12 AA20 CC09 CD06 CD10                       DD03 EA03 EC01

Claims (5)

[Claims] 1. A plurality of U-shaped glass tubes are bridge-joined,
And a fluorescent bulb having a pair of electrodes inside both end portions, an electronic lighting circuit section, an outer bulb, a resin case and a base, wherein the bulb-shaped fluorescent lamp comprises: For pipe valves, the outer diameter is 60 mm
70 mm, bottom outer diameter 50 mm to 58 mm and total length 73 mm to 85 mm, (ii) In the resin case,
The outer diameter is 50 mm to 58 mm, (iii) the lamp length of the light bulb shaped fluorescent lamp is 148 mm or less, and the fluorescent arc tube has an electrode distance of 450 mm to 540 mm and a tube inner diameter of 8.0 mm to 10.0 mm. A fluorescent lamp having a lamp current value of 220 mA or less. 2. The bulb-type fluorescent lamp according to claim 1, wherein the electrode of the fluorescent light emitting tube and the PC of the electronic lighting circuit unit.
A bulb-type fluorescent lamp characterized in that the distance from the resin substrate is in the range of 25 mm to 40 mm. 3. The compact fluorescent lamp according to claim 1, wherein a Ne composition ratio of 75 is used as a buffer gas for the fluorescent arc tube.
% Or less (Ne + Ar) mixed gas as a main component, and a compact bulb-type fluorescent lamp. 4. The light bulb type fluorescent lamp according to claim 1, wherein the fluorescent light emitting tube is formed by integrating four U-shaped glass tubes. 5. The compact fluorescent lamp according to claim 1, wherein the compact fluorescent lamp is operated in a region where the lamp current value is 210 mA or less.