JP3379530B2 - Halogen bulb and halogen bulb with reflector using the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a halogen bulb and a halogen bulb with a reflector using the same.

[0002]

2. Description of the Related Art Generally, halogen light bulbs are used for store lighting, residential lighting, and the like.

Conventionally, such a halogen bulb has a low voltage type (mainly a rated voltage of 12V type) and a high voltage type (Japan: a rated voltage of 100V or 110V type, USA: a rated voltage of 120V type, and Europe: a rated voltage. 230V
Or 240V type), and further, there are a single-ended die having a sealing portion only at one end and a double-ended die having both ends sealed.

Among such conventional halogen bulbs, the halogen bulb of single-ended type has a filament and two internal lead wires holding the filament in an arc tube having a sealing portion at one end. Has been. Further, a mother gas mainly containing xenon gas, krypton gas, argon gas or the like is enclosed in the arc tube.

A base is fixed to the sealing portion with an adhesive.

The internal lead wire is connected to the external lead wire via the metal foil sealed in the sealing portion. This external lead wire is connected to the base.

Among such single-ended halogen bulbs,
In particular, in a high-voltage type halogen bulb, it is known that the enclosure pressure of the base gas at normal temperature (25 ° C.) is set to a low pressure, for example, 0.2 MPa or less, in order to suppress damage to the arc tube.

[0008]

However, in such a conventional high-voltage type halogen bulb, the filament is broken at the end of its life, an arc discharge is induced between the broken filaments, and this arc discharge causes an internal lead. The wire moves between the wires and reaches the vicinity of the sealing part, and the thermal shock at that time (specifically, the thermal shock due to the arc discharge and the thermal shock due to the heat of the overheated internal lead wire) causes cracks in the sealing part. There is a problem that it occurs.

Further, in the conventional high voltage type halogen bulb, there is also a problem that tungsten, which is a material of the filament, evaporates, the filament is easily broken, and the life is shortened.

The present invention has been made in order to solve such a problem, and it is possible to prevent the occurrence of cracks in the sealing portion of the arc tube and to provide a long-life halogen bulb and a halogen bulb using the same. The halogen bulb with a reflector is provided.

[0011]

A halogen bulb according to claim 1 of the present invention has a filament provided in an arc tube having a sealing portion at its end, and at least one of xenon gas and krypton gas. Is a halogen bulb containing a base gas mainly containing V, a rated voltage of the halogen bulb is V (V), a filling pressure of the base gas at room temperature is P (MPa), the xenon gas and the krypton gas. When the composition ratios of X and Y are respectively Xe% and Kr%, V ≧ 100 (V) and P ≧ 0.7 + 0.1
X (Kr% / (Kr% + Xe%)) (however, Kr% +
Xe% = 100 (%), 0 ≦ Kr% ≦ 100, and 0 ≦ Xe% ≦ 100).

A halogen lamp with a reflecting mirror according to claim 4 of the present invention is provided with the halogen lamp according to any one of claims 1 to 3 inside and a front glass attached to the front surface. It has a configuration including a reflecting mirror.

With these configurations, it is possible to prevent the arc discharge induced between the broken filaments from migrating to the sealing portion, so that cracking of the sealing portion due to thermal shock is prevented. In addition, since it is possible to suppress the evaporation of tungsten in the filament, it is possible to prevent the filament from breaking.

In the present invention, all "%" representing the composition ratio of the gas represent "volume%".

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the first embodiment of the present invention is a single-ended halogen lamp having a rated voltage of 110 V (rated power of 65 W) and has a total length of 44 mm and a maximum outer diameter of 1 mm.
It is equipped with a 4 mm quartz glass arc tube 1.

The arc tube 1 has a closed portion 2, an ellipsoidal light emitting portion 3, a cylindrical tubular portion 4, and a sealing portion 5 which are successively arranged.

A base 6 is fixed to the end of the arc tube 1 on the side of the sealing portion 5 with an adhesive 7.

At least one of xenon gas and krypton gas is mainly contained in the arc tube 1, and nitrogen gas and a trace amount of methylene bromide (CH ₂ B) are contained therein.
A mother gas to which a halogen compound composed of r ₂ ) is added is enclosed. The amount of the halogen compound added is 5 ppm to 1500 ppm with respect to the whole base gas.

The term "main body" as used herein means 40% or more. Therefore, at least one of the xenon gas and the krypton gas is 40% of the total amount of the base gas.
% Or more is included.

As described above, by adding the nitrogen gas as the base gas, it is possible to suppress the occurrence of arc discharge between both ends of the filament 8 which will be described later at the time of lighting. The amount of nitrogen gas added is 5% to 2 with respect to the whole base gas.
It is preferably 0%. If the amount of nitrogen gas added is less than 5% with respect to the entire base gas, the occurrence of arc discharge cannot be suppressed. On the other hand, if the amount of nitrogen gas added exceeds 20% of the total amount of the base gas, the temperature of the filament 8 is lowered and the luminous efficiency is lowered.

On the outer surface of the arc tube 1 excluding the sealing portion 5, an infrared reflection film 9 composed of a multilayer interference film of tantalum oxide (Ta ₂ O ₅ ) and silicon oxide (SiO ₂ ) is formed.

A filament 8 made of tungsten is provided in the light emitting section 3. This filament 8
Are connected at their opposite ends to internal lead wires 11 made of tungsten held by a quartz cylindrical stem 10.

The internal lead wire 11 is connected to an external lead wire 13 made of molybdenum through a molybdenum foil 12 sealed in the sealing portion 5. The external lead wires 13 are connected to the metal fittings 6a and 6b of the base 6, respectively.

Between the external lead wire 13 and the metal fitting 6a of the base 6, when the filament 8 is broken during lighting, the current supply to the filament 8 is cut off and the arc induced between the broken filaments 8 is cut off. It is preferable to provide a protective current fuse (not shown) for preventing discharge from continuing and cracking in the sealing portion 5.

Next, in such a halogen bulb,
Base gas (composition ratio is xenon gas: nitrogen gas = 8)
Filling pressure P of methylene bromide of 8:12 and 200 ppm at room temperature (25 ° C.) (hereinafter, simply referred to as filling pressure P)
Of 50 lamps (Lamp A to Lamp S in Table 1) were variously changed from 0.1 MPa to 1.5 MPa, and each of the halogen bulbs was horizontally lit to give a drop impact. After the filament was broken, the rate of occurrence of cracks in the sealing portion 5 and the rate of breakage of the arc tube 1 were examined, and the results shown in Table 1 were obtained.

In the judgment column in Table 1, the sealing portion 5
A lamp with a crack occurrence rate of 0% is “◯”, a crack occurrence rate in the sealing portion 5 and a breakage rate of the arc tube 1 are 0%.
The lamps of No. 2 and No. 3 were designated as “⊚” and the other lamps were designated as “×” (the same applies to Tables 2 and 3).

The "damage of the arc tube" means a state where the arc tube 1 breaks and leaks.

Further, in Table 1, Examples 1 to 15 are not equipped with a protective current fuse. Example 16
˜Example 18 and the conventional example are provided with a protective current fuse.

[0030]

[Table 1]

As is apparent from Table 1, in the lamps G, H, and I, although the arc tube 1 was slightly damaged, the crack occurrence rate in the sealing portion 5 was 0%. It was In addition, lamp J, lamp K, lamp L,
Lamp M, lamp N, lamp O, lamp P, lamp Q,
In the lamp R, the occurrence rate of cracks in the sealing portion 5 was 0%, and the damage rate of the arc tube 1 was 0%.

Therefore, by setting the filling pressure P to 0.7 MPa or more, it is possible to prevent the occurrence of cracks in the sealing portion 5. Also, especially the filling pressure P is 1.0 MPa.
With the above, it is possible to prevent the occurrence of cracks in the sealing portion 5 and also to prevent the arc tube 1 from being damaged. Further, even when the sealing pressure P is 0.7 MPa or more and less than 1.0 MPa, the provision of the protective current fuse can prevent the occurrence of cracks in the sealing portion 5 and also damage the arc tube 1. Can be prevented.

On the other hand, in the lamp C, the lamp D, the lamp E, and the lamp F, cracks are generated in the sealing portion 5, or the cracks in the sealing portion 5 are the starting points, and the arc tube 1 (specifically, the sealing is performed). Some of the stoppers 5) were damaged. In particular,
In some of the lamps E and F, the arc tube 1 (specifically, the light emitting portion) was damaged regardless of the crack in the sealing portion 5. Further, in the lamps A and B, although the arc tube 1 was not damaged, cracks were generated in the sealing portion 5. Further, in the lamp S (conventional example), cracks occurred in the sealing portion, although the protective current fuse was provided.

For example, in the case of the arc tube 1 used in the halogen bulb according to the embodiment of the present invention, the filling pressure P is 5.
At 0 MPa or more, the arc tube 1 cannot withstand the magnitude of the pressure and cracks occur. However, the upper limit value of the enclosed pressure P varies depending on the material, thickness, and the like of the arc tube 1.

Here, the inventor has made the enclosed pressure P into five regions, that is, the region A (the enclosed pressure P is 0.1 MPa or more and 0.2 MPa or more).
MPa) or less, region B (filling pressure P exceeds 0.2 MPa and 0.4 MPa or less), region C (filling pressure P is 0.4 MPa)
Over 0.7 MPa and less than 0.7 MPa), region D (encapsulation pressure P is 0.7
When the arc discharge phenomenon in the arc tube in each region was observed using a video camera and an oscilloscope, the following were found: I understood.

In the region A, it was found that the arc discharge induced between the broken filaments 8 was transferred to the sealing portion 5 and then was extinguished and stopped as it is (hereinafter referred to as arc discharge transfer mode).

It was found that the arc discharge transfer mode occurs in the region B as in the region A, but the arc discharge transfer mode in the region B is different from the arc discharge transfer mode in the region A and the arc discharge is generated in the sealing portion. It lasted slightly longer at around 5.

It has been found that in the region C, the following two arc discharge phenomena occur while the arc discharge transfer mode continues. One is that the arc discharge induced between the broken filaments 8 did not move to the sealing part 5 and remained in the light emitting part 3 (hereinafter, referred to as arc discharge stagnant mode). It is considered that this is because the arc breakdown does not move to the sealing portion 5 because the discharge breakdown energy between the internal lead wires 11 increases due to the increase of the filling pressure P. The other is that the arc discharge induced between the broken filaments 8 was immediately extinguished (hereinafter referred to as arc discharge extinguishing mode). It is considered that this is because the discharge sustaining voltage of the induced arc discharge becomes higher than the rated voltage of the lamp due to the increase of the filling pressure P.

In the region D, it was found that the arc discharge transition mode disappeared, the arc discharge stagnant mode also decreased, and the arc discharge extinguishing mode became dominant.

In the region E, it was found that the arc discharge stagnant mode disappeared and only the arc discharge extinguished mode remained.

From the above, it is considered that the cracks in the sealing portion 5 are caused by the arc discharge transfer mode. That is, the thermal shock of the arc discharge induced and transferred to the sealing portion 5, and the overheated internal lead wire 1
It is considered that cracks have occurred in the sealing portion 5 due to the thermal shock of the heat of 1.

Further, it is considered that the breakage of the arc tube 1 caused by the crack generated in the sealing portion 5 as the starting point is caused by the prolonged duration of the arc discharge in the arc discharge transfer mode.

Further, it is considered that the breakage of the arc tube 1 unrelated to the cracks in the sealing portion 5 is caused by the arc discharge stagnant mode. That is, triggered,
It is considered that the light emitting unit 3 is damaged by the thermal shock of the stagnant arc discharge. However, lamp E and lamp F
As for the breakage of the arc tube 1, there is also a case where the sealing part 5 is broken due to a crack of the sealing part 5 as a starting point.

Therefore, the filling pressure P of the mother gas at room temperature is
It is considered that the reason why the crack generation in the sealing portion 5 disappeared when the pressure was set to 0.7 MPa or more was that the arc discharge transfer mode disappeared.

Further, the filling pressure P of the mother gas at room temperature is 1.
It is considered that the reason why the damage to the light emitting section 3 did not occur when the pressure was set to 0 MPa or more was that the arc discharge transfer mode and the arc discharge stagnant mode disappeared.

Next, as a halogen bulb, a base gas (composition ratio: krypton gas: nitrogen gas = 88: 12,
And 200 ppm of methylene bromide), the encapsulation pressure P of which at room temperature was variously changed from 0.1 MPa to 1.4 MPa, 50 pieces each were produced, and the same as when the base gas mainly containing xenon gas was used. When the occurrence rate of cracks in the sealing portion 5 and the breakage rate of the arc tube 1 were examined under the conditions, the results shown in Table 2 were obtained.

In Table 2, Examples 19 to 32 do not have a protective current fuse. Example 3
A protective current fuse is provided in each of Examples 3 to 35.

[0048]

[Table 2]

As is clear from Table 2, in the lamps a, b, and c, although the arc tube 1 was slightly damaged, the occurrence rate of cracks in the sealing portion 5 was 0%. It was In addition, lamp d, lamp e, lamp f,
For lamp g, lamp h, lamp i, and lamp j,
The occurrence rate of cracks in the sealing portion 5 was 0%, and the damage rate of the arc tube 1 was 0%.

Therefore, by setting the filling pressure P of the base gas mainly composed of krypton gas at room temperature to 0.8 MPa or more, the occurrence of cracks in the sealing portion 5 can be prevented. Further, by setting the filling pressure P of the base gas mainly composed of krypton gas at room temperature to 1.1 MPa or more, it is possible to prevent the occurrence of cracks in the sealing portion 5 and damage the arc tube 1. Can also be prevented. Furthermore, the enclosed pressure P is 0.8 MPa or more and 1.1 MP
Even if it is less than a, the provision of the protective current fuse can prevent the occurrence of cracks in the sealing portion 5 and also prevent the arc tube 1 from being damaged.

On the other hand, in the lamp V, the lamp W, the lamp X, the lamp Y, and the lamp Z, a crack is generated in the sealing portion 5, or the crack of the sealing portion 5 serves as a starting point and the arc tube 1 (specifically, In some cases, the sealing part 5) was damaged. In particular, in some lamps Y and Z, the arc tube 1 (specifically, the light emitting portion) was damaged regardless of the crack in the sealing portion 5. Further, in the lamp T and the lamp U, although the arc tube 1 was not damaged, cracks were generated in the sealing portion 5.

Further, as a halogen bulb, the filling pressure P of the base gas (composition ratio: xenon gas: krypton gas: nitrogen gas = 44: 44: 12, and 200 ppm of methylene bromide) at room temperature from 0.1 MPa to 1 MPa. .4MP
Fifty pieces with various changes up to a were produced, and the incidence of cracks in the sealing portion 5 and the fracture rate of the arc tube 1 were examined under the same conditions as in the case of using a base gas mainly composed of xenon gas. However, the results shown in Table 3 were obtained.

In Table 3, Examples 36 to 49 do not have a protective current fuse. Example 5
0 to Example 52 are provided with a protective current fuse.

[0054]

[Table 3]

As is clear from Table 3, in the lamps r, s, and t, although the arc tube 1 was slightly damaged, the crack occurrence rate in the sealing portion 5 was 0%. It was In addition, lamp u, lamp v, lamp w,
In each of the lamp x, the lamp y, the lamp z, and the lamp aa, the crack occurrence rate in the sealing portion 5 was 0%, and the breakage rate of the arc tube 1 was 0%.

Therefore, by setting the filling pressure P of the base gas mainly composed of xenon gas and krypton gas at room temperature to, for example, 0.8 MPa or more, it is possible to prevent the occurrence of cracks in the sealing portion 5. Further, by setting the filling pressure P of the base gas mainly composed of xenon gas and krypton gas at room temperature to be 1.1 MPa or more, it is possible to prevent the occurrence of cracks in the sealing portion 5 and to emit light. It is possible to prevent breakage of the pipe 1. Furthermore, the enclosed pressure P is 0.8 MPa or more and 1.1 MPa.
Even if it is less than 1, the provision of the protective current fuse makes it possible to prevent the occurrence of cracks in the sealing portion 5 and also prevent damage to the arc tube 1.

On the other hand, in the lamp m, the lamp n, the lamp o, the lamp p, and the lamp q, a crack is generated in the sealing portion 5, or the crack of the sealing portion 5 serves as a starting point and the arc tube 1 (specifically, In some cases, the sealing part 5) was damaged. In particular, in some of the lamps p and q, the arc tube 1 (specifically, the light emitting portion) was damaged regardless of the cracks in the sealing portion 5. In the lamps k and l, the arc tube 1 was not damaged, but cracks were generated in the sealing portion 5.

Next, the life time of the lamp B and the lamp G shown in Table 1 was examined.

The measurement of the life time was repeated with one cycle consisting of lighting for 2.5 hours and extinguishing for 0.5 hours.

As a result, the life time of the lamp G is 32
It was 50 hours. On the other hand, lamp B has a lifetime of 1
It was 850 hours. It is considered that this is because, in the case of the lamp G, the filling pressure P is higher than that of the lamp B, so that the evaporation of the tungsten of the filament 8 can be suppressed.

As described above, the filament 8 is provided in the arc tube 1 having the sealing portion 5 at the end, and the base gas mainly containing at least one of xenon gas and krypton gas is enclosed. , Rated voltage V
(V), the filling pressure of the mother gas at room temperature is P (MPa), and the composition ratio of xenon gas and krypton gas is X, respectively.
When e% and Kr%, V ≧ 100 (V) and P
≧ 0.7 + 0.1 × (Kr% / (Kr% + Xe%))
(However, Kr% + Xe% = 100 (%) and 0 ≦
By satisfying the relational expression of Kr% ≦ 100 and 0 ≦ Xe% ≦ 100, it is possible to prevent the occurrence of cracks in the sealing portion 5 and improve the life time.

The lower limit of the filling pressure P of the base gas differs between the case where xenon gas is mainly used (0.7 MPa) and the case where krypton gas is mainly used (0.8 MPa). Since the atomic radius is smaller than that of xenon gas, the mean free path of krypton gas is longer than that of xenon gas.As a result, when only krypton gas is sealed, when only xenon gas is sealed. It is considered that this is because the probability of ionization due to electrons is higher than that of, and arc discharge is more likely to occur.

In particular, P ≧ 1.0 + 0.1 × (Kr%
/ (Kr% + Xe%)) (Kr% + Xe% = 1
00 and 0 ≦ Kr% ≦ 100 and 0 ≦ Xe% ≦
By satisfying the relational expression 100), it is possible to prevent the arc tube 1 from being damaged.

Furthermore, in a halogen bulb equipped with a protective current fuse, the rated voltage of the halogen bulb is V
(V), the filling pressure of the mother gas at room temperature is P (MPa), and the composition ratio of xenon gas and krypton gas is X, respectively.
When e% and Kr%, V ≧ 100 (V) and P
≧ 0.7 + 0.1 × (Kr% / (Kr% + Xe%))
(However, Kr% + Xe% = 100 (%) and 0 ≦
By satisfying the relational expression of Kr% ≦ 100 and 0 ≦ Xe% ≦ 100, a protection current fuse having a larger wire diameter can be used as compared with a conventional halogen light bulb (for example, the lamp S). , Protective current fuses and caps 6
The connection work with the metal fitting 6a and the connection work between the protection current fuse and the external lead wire 13 can be facilitated, and breakage of the protection current fuse can be prevented.
Hereinafter, the reason why the protection current fuse having a large wire diameter can be used will be described.

First, the wire diameter of the protective current fuse is changed variously.
Fuse blowing time T _hAdjust (msec)
As a result, the results shown in Table 4 were obtained.

Next, in Lamp A, Lamp G, Lamp H, and Lamp I, the minimum duration T _min (msec) of the arc discharge induced between the broken filaments was examined. Results were obtained.

[0067]

[Table 4]

[0068]

[Table 5]

If the relational expression (T _min −T _h )> 0 is satisfied, it is possible to prevent the arc tube 1 from being damaged, that is, the protective current fuse is blown before the arc tube 1 is damaged. Means to do.

Therefore, as is apparent from Tables 4 and 5, when the lamp G, that is, the filling pressure P is 0.7 MPa, it is possible to use a protective current fuse having a wire diameter of 0.24 mm or less. . Also, the lamp H,
That is, when the filling pressure P is 0.8 MPa, the wire diameter is 0.28.
It can be seen that protective current fuses up to mm can be used. Furthermore, it is understood that when the lamp I, that is, the filling pressure P is 0.9 MPa, a protective current fuse having a wire diameter of 0.30 mm or less can be used.

On the other hand, in the lamp A, the wire diameter is 0.12 mm.
It can be seen that only the protective current fuse can be used up to the following.

With the above-described structure, it is possible to use a protective current fuse having a large wire diameter.

In the above embodiment, the case where the base gas is made of at least one of xenon gas and krypton gas and nitrogen gas has been described. However, argon gas or the like is added to the base gas. However, the same effect as above can be obtained.

In the above embodiment, the rated voltage 11
The case of a halogen bulb having a rated power of 65 W at 0 V has been described, but the present invention is not limited to this, and a rated power of 5 V at a rated voltage of 100 V is used.
0W or 90W halogen bulb or rated voltage 110
Even in the case of a halogen bulb of V, 120V, 220V, 230V, 240V or the like, the same effect as above can be obtained.

Next, as shown in FIG. 2, a lamp with a reflecting mirror according to a second embodiment of the present invention has a spheroidal reflecting mirror 14 having a front opening diameter of 70 mm, and this reflecting mirror. 1
Rated voltage 110V (rated power 65
It has a single-ended halogen light bulb 15 of W) and a front glass 16 attached to the front surface of the reflecting mirror 14.

Reference numeral 17 indicates a base.

The single-ended halogen light bulb 15 is the same as the one-ended halogen light bulb with the rated voltage of 110 V (rated power of 65 W) according to the first embodiment of the present invention shown in FIG. Have a configuration.

The single-ended halogen bulb 15 is fixed to the base 17 with an adhesive (not shown).

The front glass 16 is fixed to the reflecting mirror 14 by a metal fitting 16a.

According to the structure of the lamp with a reflector according to the second embodiment of the present invention as described above, it is possible to prevent the occurrence of cracks in the sealing portion and improve the life time. You can

[0081]

As described above, according to the present invention, it is possible to prevent the occurrence of cracks in the sealing portion and to provide a halogen bulb having a long life and a lamp with a reflector using the halogen bulb. Is.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view of a halogen bulb according to a first embodiment of the present invention.

FIG. 2 is a partially cutaway front view of a reflector-equipped lamp according to a second embodiment of the present invention.

[Explanation of symbols]

1 arc tube 2 blockage 3 light emitting part 4 tube 5 Sealing part 6,17 mouthpiece 6a, 6b metal fittings 7 adhesive 8 filament 9 Infrared reflective film 10 stems 11 internal lead wire 12 Molybdenum foil 13 External lead wire 14 Reflector 15 single-ended halogen bulb 16 Front glass 16a metal fittings

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Takeshi Fujikawa Inventor Takeshi Fujikawa 1-1, Sachimachi, Takatsuki-shi, Osaka, Matsushita Electronics Industrial Co., Ltd. (56) Reference JP 10-241639 (JP, A) JP JP 11-67160 (JP, A) JP-A-7-254394 (JP, A) Actual development Sho 55-133669 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) H01R 1/50 H01R 1/66

Claims (4)

(57) [Claims] 1. A halogen light bulb in which a filament is provided in an arc tube having a sealing portion at an end thereof, and a host gas mainly containing at least one of xenon gas and krypton gas is enclosed. When the rated voltage of the halogen bulb is V (V), the filling pressure of the base gas at room temperature is P (MPa), and the composition ratios of the xenon gas and the krypton gas are Xe% and Kr%, respectively, V ≧ 100 (V) and P ≧ 0.7 + 0.1 ×
(Kr% / (Kr% + Xe%)) (However, Kr% + X
e% = 100 (%) and 0 ≦ Kr% ≦ 100 and 0 ≦ Xe% ≦ 100). 2. P ≧ 1.0 + 0.1 × (Kr% / (Kr
% + Xe%)) (however, Kr% + Xe% = 100
(%) And 0 ≦ Kr% ≦ 100 and 0 ≦ Xe%
The halogen light bulb according to claim 1, wherein the relational expression ≦ 100) is satisfied. 3. The protective current fuse for cutting off the current supply to the filament when the filament is broken during lighting, according to claim 1 or claim 2. Halogen bulb. 4. A halogen with a reflector, wherein the halogen bulb according to any one of claims 1 to 3 is provided inside, and a reflector having a front glass attached to a front surface thereof is provided. light bulb.