JPH07220691A - Incandescent lamp and lighting system and vehicle headlight using this - Google Patents

Abstract

PURPOSE:To efficiently use an infrared ray reflecting film by making an outside diameter of a cylinder part connected to a spherical part smaller than a width of a press-fitting sealing part, and restraining oxidation of metallic foil arranged in the press-fitting sealing part to the minimum. CONSTITUTION:A tungsten halogen lamp 1 is composed of a light emitting tube bulb 2 inside which halogen gas is sealed and a base 3 having a collar. Here, the light emitting tube bulb 2 is formed of quartz glass, and a base end is press-fitted and sealed, and is formed as a one-sided sealing structure. In the light emitting tube bulb 2, a spherical part 4 is formed in a tip part, and a cylinder part 5 is integrally formed on the side of the base end by continuing to this spherical part 4, and a sealing part 6 is integrally formed in the cylinder part 5. Here, an outside diameter R of the cylinder part 5 is made smaller than a width W of the sealing part 6, and a maximum diameter of the spherical part 4 is constituted larger than this width W. Thereby, a heat conducting quantity to the press-fitting sealing part 6 from the spherical part 4 is reduced, and oxidation of Mo foil 10a and 10b sealed in the press-fitting sealing part 6 can be restrained to the minimum.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an incandescent lamp containing one or two filaments inside, an illuminating device using the same, and a vehicle headlamp.

[0002]

2. Description of the Related Art For example, a recent vehicle headlamp uses a highly efficient halogen bulb as a light source. The halogen bulb is attached to a reflector, and the light emitted from this bulb is forwarded by the reflector. It is designed to reflect on and illuminate the front. The halogen light bulb contains a traveling beam filament and a passing beam filament, and while the vehicle is normally traveling, the traveling beam filament is lit to illuminate a distant place brightly and an oncoming vehicle. When passing each other, the filament for the passing beam is switched on and turned on, and the light distribution characteristic of the front irradiation is directed to the lower left (in the case of Japan) to reduce glare to oncoming vehicles.

By the way, generally, an incandescent light bulb including a halogen light bulb is a light source which utilizes the light emission due to the incandescence of a filament, so that it has a large amount of heat radiation and tends to have a lower lamp efficiency than a discharge lamp. Reduce the heat dissipation of such an incandescent light bulb,
In order to improve the lamp efficiency, recently, on the outer surface of the bulb,
Research has been conducted on forming a film that reflects infrared rays and transmits visible light, that is, an infrared reflecting film.

If an infrared reflecting film is formed on the outer surface of the bulb, the infrared reflecting film reflects the infrared rays emitted from the filament, and the reflected infrared rays are returned to the filament to reheat the filament. Since the incandescence is promoted, the power supplied from the outside can be saved and the luminous efficiency is improved. Also, because the amount of heat wasted wasted is reduced,
There is also an advantage that the heat effect on the equipment can be reduced.

[0005]

However, in the conventional incandescent light bulb, since the cylindrical portion is thick, the heat radiation from the filament in the spherical portion easily leaks to the crushable sealing portion through the cylindrical portion, and the crushable sealing portion. The metal foil sealed on the sheet is easily oxidized. Moreover, the area of the spherical surface in the spherical portion is limited, and the infrared reflecting film cannot be effectively used.

The present invention has been made in consideration of such circumstances, and by making the outer diameter of the cylindrical portion smaller than the width of the pressure-bonding sealing portion, the heat transfer from the spherical portion to the crushing sealing portion is reduced. And, while minimizing the oxidation of the metal foil arranged in the crushing sealing portion, the spherical surface of the spherical portion can be widened to efficiently use the infrared reflective film, and an illumination device using the same. It is intended to provide a vehicle headlight.

[0007]

The present invention has a spherical portion having a spherical shape or a shape similar to this, a cylindrical portion connected to the spherical portion, and a collapsible sealing portion connected to the cylindrical portion. In an incandescent light bulb in which a filament is housed in at least the spherical portion and an infrared visible light transmitting film composed of a high refractive index layer and a low refractive index layer is formed on the spherical portion surface, the outer diameter of the cylindrical portion is crushed and sealed. It is an incandescent light bulb characterized by being smaller than the width of the stop.

In the present invention, as an aspect of the incandescent light bulb, for example, as in "Claim 2" of the claims, the passing beam filament is accommodated in the spherical portion and the traveling beam filament is accommodated in the cylindrical portion. Examples thereof include an incandescent light bulb which is housed and used as a light source for a vehicle headlight, an incandescent light bulb in which a traveling beam filament is contained in a spherical portion, or an incandescent light bulb in which a passing beam filament is contained in a spherical portion.

In the present invention, the illuminating device is constructed by incorporating an incandescent lamp having a traveling beam filament accommodated in a spherical portion into a reflector. Further, a vehicle headlight is provided by incorporating an incandescent light bulb into a reflector, which is characterized in that a filament for a passing beam is housed in a spherical portion and a filament for a traveling beam is housed in the cylindrical portion and is used as a light source for a vehicle headlight. Is configured. In the present invention, the spherical portion having a spherical shape or a shape similar thereto includes, in addition to a spherical portion, for example, an ellipse, an aggregate of a plurality of curved surfaces, and the like.

In the present invention, it is desirable that the boundary between the spherical portion and the cylindrical portion is curved. Thereby, when the incandescent light bulb is used, stress on the boundary can be relieved. In the present invention, the shape of the cylindrical portion may be, for example, a drum shape as shown in FIG. 6 in addition to the cylindrical body.

In the present invention, the infrared visible light transmitting film can be formed by, for example, dipping, vacuum deposition, ion plating, sputtering, CVD. The infrared visible light transmitting film may be formed on either the outer surface or the inner surface of the spherical portion. Examples of the material of the high refractive index layer constituting the infrared visible light transmitting film include titanium oxide (TiO ₂ ), tantalum oxide (Ta ₂ O ₅ ), zirconium oxide (ZrO ₂ ), and zinc sulfide (ZnS). Can be mentioned. The material of the low refractive index layer is silicon oxide (silica = SiO ₂ ), magnesium fluoride (MgF)
₂ ). The infrared visible light transmitting film formed by alternately laminating a plurality of high refractive index layers and low refractive index layers as described above has a function of transmitting visible light while reflecting infrared light by a multilayer buffering function.

[0012]

According to the present invention, by making the outer diameter of the cylindrical portion smaller than the width of the crush sealing portion, the heat transfer from the spherical portion to the crush sealing portion is reduced, and the cylindrical portion is arranged in the crush sealing portion. It is possible to minimize the oxidation of the formed metal foil and widen the spherical surface of the spherical portion to efficiently use the infrared reflecting film. Also, since the boundary between the spherical part and the cylindrical part is joined with a gentle curve, when using a halogen bulb,
It is possible to reduce the stress on the boundary portion.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. (Embodiment 1) Please refer to FIG. 1 and FIG. Here, FIG. 1 shows a halogen bulb used as a light source of a lighting device, and FIG.
Shows an explanatory view of an infrared visible light transmitting film which is one configuration of the halogen bulb. The halogen bulb 1 is composed of an arc tube bulb 2 in which a halogen gas is enclosed and a flanged cap 3. Here, the arc tube bulb 2 is made of quartz glass and has a one-end sealing structure in which the base end is crushed and sealed. A spherical portion 4 is formed at the tip of the arc tube bulb 2, and a cylindrical portion 5 is integrally formed continuously with the spherical portion 4 toward the proximal end, and the cylindrical portion 5 has a sealing portion. 6 is integrally formed. The outer diameter R of the cylindrical portion 5 is smaller than the width W of the sealing portion 6, and the maximum diameter of the spherical portion 4 is larger than the width W. The boundary between the spherical portion 4 and the cylindrical portion 5 is joined in a gently curved state.

The outer surface of the arc tube bulb 2 (or the inner surface is acceptable)
A visible light transmitting / infrared reflecting film 7 is formed on. The infrared reflective film 7 is made of, for example, titanium oxide (TiO ₂ ), tantalum oxide (Ta ₂ O ₅ ), zirconium oxide (ZrO ₂ ).
₂ ), a high refractive index layer 21 made of zinc sulfide (ZnS), etc.
And a low refractive index layer 22 made of silicon oxide (silica = SiO ₂ ) or magnesium fluoride (MgF ₂ ) are alternately formed as a multilayer film of, for example, 9 to 17 layers in total. The infrared reflective film 5 as described above has a function of transmitting visible light while reflecting infrared rays by a multilayer interference effect.

At the approximate center of the spherical portion 4 of the arc tube bulb 2, a traveling beam filament 8 made of tungsten is provided.
Are arranged. An internal lead wire 9a is connected to one end of the traveling beam filament 8 and an internal lead wire 9b is connected to the other end. Here, one inner lead wire 9a is a metal (Mo) foil sealed in the sealing portion 6.
The Mo foil 10a is connected to a leg terminal 11a extending outside the sealing portion 6. The other inner lead wire 9b is a metal (Mo) foil 10b sealed in the sealing portion 6.
The Mo foil 10b is connected to the leg terminal 11b extending outside the sealing portion 6.

The flanged cap 3 is attached to the one end sealing portion of the valve 2. Mouthpiece base 3 is cylindrical base body 15
A flange 16 is provided on the end and two leg terminals are provided at the end.
11a and 11b are provided, and the cylindrical base body 15 is covered on the crushing seal portion 6 of the valve 2 and is joined by an adhesive (not shown).

According to the halogen bulb of the first embodiment, since the diameter R of the cylindrical portion 5 is smaller than the width W of the crushing sealing portion 6, the crushing sealing is performed from the spherical portion 4 as compared with the conventional case. The heat conduction to the portion 6 can be reduced, and the oxidation of the Mo foils 10a and 10b sealed to the crushing sealing portion 6 can be minimized. Further, for the same reason, the spherical surface of the spherical portion 4 can be widened and the infrared reflection film 7 can be used efficiently. Furthermore, since the boundary between the spherical portion 4 and the cylindrical portion 5 is joined in a gently curved state, it is possible to reduce stress on the boundary when the halogen bulb is used.

(Embodiment 2) Referring to FIG. FIG. 3 is a side view of a halogen bulb for a vehicle headlight. The same members as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted. Reference numeral 31 in FIG. 3 indicates a filament for a low beam which is arranged substantially at the center of the spherical portion 3 of the arc tube bulb 2. In the vicinity of this filament 31, a light shielding plate 39
Are arranged. The light-shielding plate 39 is for blocking or dimming the right-top light (in the case of Japan) in the light distribution of the front irradiation when used as a vehicle headlight. Further, the traveling beam filament 8 is arranged in the cylindrical portion 4 from the base end rather than the passing beam filament 31. An internal lead wire 32a is connected to one end of the low beam filament 31 and an internal lead wire 32b is connected to the other end. Here, one inner lead wire 32a is connected to the Mo foil 33a sealed in the sealing portion 6, and the Mo foil 33a is sealed in the sealing portion 6.
It is connected to a leg terminal 34a extending outward. The other inner lead wire 32b is Mo foil 33 sealed in the sealing portion 6.
The Mo foil 33b is connected to the leg terminal 34b extending outside the sealing portion 6.

An internal lead wire 32c connected to the internal lead wire 32a is connected to one end of the traveling beam filament 8 and an internal lead wire 32d is connected to the other end.
The internal lead wire 32d is M sealed in the sealing portion 6.
The Mo foil 33c is connected to the o foil 33c, and the Mo foil 33c is connected to the leg terminal 34c extending outside the sealing portion 6.

According to the halogen bulb of the second embodiment, since the diameter R of the cylindrical portion 5 is smaller than the width W of the crushing sealing portion 6, the crushing sealing is performed from the spherical portion 4 as compared with the conventional case. The heat conduction to the portion 6 can be reduced, and the oxidation of the Mo foils 33a, 33b, 33c sealed to the crushing sealing portion 6 can be minimized. Further, for the same reason, the spherical surface of the spherical portion 4 can be widened and the infrared reflection film 7 can be used efficiently. Furthermore, since the boundary between the spherical portion 4 and the cylindrical portion 5 is joined in a gently curved state, it is possible to reduce stress on the boundary when the halogen bulb is used.

(Embodiment 3) Referring to FIG. 4 is shown in FIG.
The side view of the illuminating device which used the halogen bulb of FIG. However, the same members as those of the first embodiment are designated by the same reference numerals, and the description thereof will be omitted, and only the main parts will be described. The number 41 in the figure is
It is a reflector as a reflector. The reflecting mirror 41 includes a reflecting mirror main body 42 that forms a rotating paraboloid. This reflector body
42 is formed of aluminum, but glass or the like may be used. The mirror diameter is 3 at the front opening of the reflector main body 42.
A light projecting port 43 having a size of 5 to 60 mm is formed, and a lamp mounting cylinder portion 44 is formed on the back surface. Here, the lamp mounting tube portion 44 has a cylindrical shape or a rectangular tube shape, and the halogen bulb 1
The crushable sealing part 6 is inserted from the front side. A reflecting surface is formed on the paraboloid of revolution of the reflecting mirror body 42, and an infrared absorbing film and a dichroic film (not shown) are sequentially laminated on the reflecting surface. The crushing seal portion 6 of the halogen bulb is bonded to the lamp mounting cylinder portion 44 of the reflecting mirror 41 with an adhesive 45.
A rear end opening of the lamp mounting cylinder portion 44 is closed by a closing plate 46.

(Embodiment 4) Referring to FIG. FIG. 5 is a side view of a vehicle headlamp using the halogen bulb of FIG.
The same members as those in FIGS. 1 and 3 are designated by the same reference numerals and the description thereof will be omitted.

The halogen bulb 1 is housed in a reflector 51 as shown in FIG. Here, the reflector 51 is composed of a reflector 53 having a reflecting surface 52 and a front lens 54 attached to a front opening portion of the reflector 53, and a mounting hole 55 is provided at the top of the rear surface of the reflector 53. Has been formed. The halogen bulb 1 is inserted into the mounting hole 55, and the halogen bulb 1 is fixed to the periphery of the mounting hole 55 by fixing the flange 16 provided on the flanged cap 3 to
The reflector 53 is positioned and attached at a predetermined position.

The operation of the embodiment having such a structure will be described. The headlamp assembled as shown in FIG.
When the (common) leg terminal 34a and the other leg terminals 34b, 34c are connected to a DC 12V power source, a potential difference is applied between the common inner lead wire 32a and the other inner lead wires, so that the traveling beam filament 8 is applied. An electric current flows, so that the traveling beam filament 8 emits light. This light is emitted to the surroundings and emitted from the spherical portion 4 and the cylindrical portion 5 of the bulb 2 to the outside. When this light passes through the infrared reflection film 7 formed on the outer surfaces of the spherical portion 4 and the cylindrical portion 5, visible light is transmitted and infrared rays are reflected.

The visible light that has passed through is reflected by the reflector 53.
The light is reflected by the front surface of the reflector 52 and directed forward, and the front lens 54 attached to the front opening of the reflector 53 controls the light distribution to illuminate the front. In this case, the traveling beam is such that a strong beam reaches far away. The infrared light reflected by the infrared reflection film 7 is returned to the inside of the bulb 2, and the returned infrared light heats the traveling beam filament 8.
In this case, since the traveling beam filament 8 is housed in the cylindrical portion 5 of the bulb 2, the infrared rays mainly reflected by the infrared reflection film 7 formed on the cylindrical portion 5 are returned to the traveling beam filament 8. Therefore, the traveling beam filament 8 is given not only the electric energy supplied from the power source but also the thermal energy due to the infrared rays reflected by the infrared reflecting film 7, so that the temperature rise is promoted and the incandescence is improved. In this case, if the emission intensity is set to the same level as when the infrared reflection film is not provided, the power energy supplied from the power source can be reduced by the amount of the heat energy reflected by the infrared reflection film 7. Power consumption can be saved.

On the other hand, the common leg terminal 34a and the other leg terminal 34
When b and 34c are connected to a DC 12V power source, a potential difference is given between the common internal lead wire 32a and other internal lead wires, and in this case, the low beam filament 31 is energized, and thus, the low beam filament 31 lights up. This light is emitted to the surroundings. However, since the light shielding plate 32 is provided in the vicinity of the passing beam filament 31, the light traveling toward the light shielding plate 32 is blocked.

The light thus radiated to the outside is radiated to the outside from the spherical portion 4 and the cylindrical portion 5 of the bulb 2.
When this light passes through the infrared reflection film 7 formed on the outer surfaces of the spherical portion 4 and the cylindrical portion 5, visible light is transmitted and infrared rays are reflected.

The visible light that has passed through is reflected by the reflector 53.
The light is reflected by 52 and goes forward, and the front lens 54 controls the light distribution to illuminate the front. In this case, the light shielding plate 32
Due to the action of, part of the light traveling forward is cut off, and the light traveling in the upper right direction is blocked or dimmed to reduce glare to the oncoming vehicle. Further, in this case, since the relatively close road surface is illuminated, the brightness may be lower than that in the case of the traveling beam. Therefore, normally, the brightness of the beam filament 31 is different from that of the traveling beam filament 7. The rated power is reduced. For example, according to the standard, in the case of a 4H type halogen bulb, a traveling beam filament is 60 W and a difference beam filament is 5 V for a power supply voltage of 12 V.
It is set to 5W.

The infrared light reflected by the infrared reflecting film 7 is returned to the inside of the bulb 2. In this case, since the low beam filament 31 is disposed in the bulb 2 in the spherical portion 4 at substantially the center point thereof, infrared rays are reflected on the entire spherical surface and are focused at the center. Effectively return to 31. That is, as compared with the infrared rays returned to the traveling beam filament 8 arranged in the cylindrical portion 4, the infrared rays returned to the low beam filament 31 housed in the spherical portion 4 are condensed, so that the feedback rate is high and therefore the reflection is high. The rate at which the low beam filament 31 is heated by infrared rays increases.

In this case as well, since the passing beam filament 31 is supplied with the heat energy by the infrared rays reflected by the infrared reflecting film 7 in addition to the power energy supplied from the power source, the temperature rise is promoted and the incandescent light is generated. improves. Also in this case, if the emission intensity is set to the same level as when the infrared reflection film is not provided, the infrared reflection film 5
The power energy supplied from the power source can be reduced by the amount of the heat energy reflected by the power source, and thus the power consumption can be saved.

Moreover, in general, the vehicle has more opportunities to travel with the passing beam than to travel with the traveling beam. Therefore, if the passing beam filament 31 is housed in the spherical portion 4, the energy efficiency with respect to the frequently used passing beam filament 31 can be increased. Compared with, the electric energy of the entire lamp can be significantly reduced and the efficiency can be improved.

In the above embodiment, the case of the halogen bulb is described, but the present invention is not limited to this, and any bulb having at least one filament in the spherical portion can be implemented.

Further, in the above embodiment, the case where the cylindrical portion of the halogen light bulb has a cylindrical shape has been described, but the present invention is not limited to this. For example, as shown in FIG. 6, a shape gently curved from both end sides to the central portion, The case where the so-called drum-shaped cylindrical portion 61 is included may be used.

[0034]

As described above, according to the present invention,
By making the outer diameter of the cylindrical part smaller than the width of the crimp seal part, the heat transfer from the spherical part to the crush seal part is reduced, and the oxidation of the metal foil placed in the crush seal part is minimized. It is possible to provide an incandescent light bulb that can suppress and widen the spherical surface of the spherical portion to efficiently use the infrared reflection film, an illumination device using the same, and a vehicle headlight.

[Brief description of drawings]

FIG. 1 is a side view of a halogen light bulb according to a first embodiment of the present invention.

FIG. 2 is an explanatory view of an infrared visible light transmitting film which is one configuration of the halogen bulb according to the embodiment.

FIG. 3 is a side view of a halogen light bulb for a vehicle headlight according to a second embodiment of the present invention.

FIG. 4 is a side view of a lighting device using a halogen bulb according to a third embodiment of the present invention.

FIG. 5 is a side view of a vehicle headlamp using a halogen light bulb according to a fourth embodiment of the present invention.

FIG. 6 is a side view of a halogen light bulb having a drum-shaped cylindrical body according to the present invention.

[Explanation of symbols]

1 ... Halogen bulb, 2 ... Arc tube bulb, 3
... Ball with cap, 4 ... Spherical part, 5 ... Cylindrical part,
6 ... Crushing sealing part, 7 ... Infrared reflecting film, 8
... Running beam filaments, 9a, 9b, 32a, 32
b, 32c ... internal lead wire, 10a, 10b, 33a, 33b, 33
c ... Mo foil, 11a, 11b, 34a, 34b, 34c ... Leg terminals, 21 ... High refractive index layer, 22 ... Low refractive index layer,
31 ... filament for passing beam, 39 ...
41 ... Reflector, 42 ... Reflector body, 43 ...
Light emitting port, 44 ... Lamp mounting cylinder, 45 ... Adhesive, 46 ... Closure plate, 51 ... Reflector, 52 ... Reflecting surface, 53 ... Reflector,
54 ... Front lens, 55 ... Mounting port.

Claims (6)

[Claims] 1. A spherical portion having a spherical shape or a shape similar thereto, a cylindrical portion connected to the spherical portion, and a crushing sealing portion connected to the cylindrical portion, and at least a filament is provided in the spherical portion. An incandescent lamp that accommodates and forms an infrared visible light transmitting film composed of a high refractive index layer and a low refractive index layer on the spherical surface, wherein the outer diameter of the cylindrical portion is smaller than the width of the crush sealing portion. An incandescent light bulb characterized by. 2. The incandescent lamp according to claim 1, wherein a filament for a low beam is accommodated in the spherical portion and a filament for a traveling beam is accommodated in the cylindrical portion to be used as a light source for a vehicle headlight. 3. The incandescent lamp according to claim 1, wherein the inner wall surface of the connecting portion of the spherical portion and the cylindrical portion is a curved surface. 4. The incandescent lamp according to claim 1, wherein the cylindrical portion has a drum shape. 5. An illumination device comprising the incandescent lamp according to claim 1 incorporated in a reflector. 6. A vehicle headlight comprising the incandescent lamp according to claim 2 incorporated in a reflector.