JPH042002A - Head lamp for car - Google Patents

Abstract

PURPOSE:To convert ultraviolet rays generated by a discharge bulb into harm less beams by enclosing the discharge bulb fully with a cylindrical globe, having a blocked tip, which is provided on the inside and/or outside with a fluorescent film emitting light with ultraviolet irradiation. CONSTITUTION:A discharge bulb 10 is fitted in a hole 3, and a front lens 6 is installed at the front opening of a lamp body 4 to embody a consolidated structure as a head lamp. The discharge bulb 10 is formed from a discharge lamp 12 and lead supports 22, 24, and a globe 30 enclosing these lamp 12 and supports 22, 24 entirely is fixed to an insulative base 20. The inner surface of this globe 30 is coated with a fluorescent film 32 which emits fluorescence with ultraviolet irradiation. This film 32 emits fluorescence as a visible beam when irradiated with the ultraviolet rays generated by the discharge lamp 12.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a headlamp for an automobile, and more particularly to a headlamp for an automobile that uses a discharge bulb as a light source.

[Prior art and problems to be solved by the invention] In the recent automotive lamp industry, lamps with good luminous efficiency and color rendering properties,
Moreover, discharge bulbs are attracting attention because of their long lifespan. However, for example, a metal halide bulb, which is a type of discharge bulb, generates a large amount of ultraviolet light as well as visible light when emitting light due to the sealing gas (mercury, iodide, Xe gas) in the discharge space. It has been pointed out that the ultraviolet rays generated from the discharge bulb cause skin cancer and destroy the resin members that make up the lamp. As described above, since the light emitted from the discharge bulb contains ultraviolet rays that are harmful to the human body, there is a problem in that exposure to the irradiation over a long period of time is not good for health, and the resin members around the discharge bulb also deteriorate quickly.

The present invention has been made in view of the problems of the prior art,
The purpose is to provide an automobile headlamp that can convert ultraviolet rays generated from a discharge bulb, which is a light source, into harmless light.

[Means to solve the problem]

In order to achieve the above object, in the automobile headlamp according to claim (1), a discharge bulb as a light source is provided in front of the reflector in the lamp body, and a front lens is assembled in the front opening of the lamp body. In the automobile headlamp fitted with the discharge bulb, the discharge bulb is placed inside or/and
The glove is completely covered with a tubular glove with a closed end and a fluorescent film that emits light when exposed to ultraviolet rays on the outside.

Further, in the automobile headlamp according to claim (2), a discharge bulb as a light source is provided in front of the reflector in the lamp body, and a front lens is assembled to the front opening of the lamp body. In,
An inner lens having a fluorescent film formed on the inside and/or outside that emits light by ultraviolet rays is disposed in front of the discharge bulb.

Further, in the automobile headlamp according to claim (3), a discharge bulb as a light source is provided in front of the reflector in the lamp body, and a front lens is assembled to the front opening of the lamp body. In,
A fluorescent film that emits light by ultraviolet rays is formed on the back side of the front lens.

Further, in the automobile headlamp according to claim (4), a discharge bulb as a light source is provided in front of the reflector in the lamp body, and a front lens is assembled to the front opening of the lamp body. In,
A fluorescent film that emits light by ultraviolet rays is formed on the surface of the reflector.

[Effect]

In claim (1), the light emitted from the discharge bulb passes through a globe that completely covers the discharge bulb, and the ultraviolet light generated along with the light emission from the discharge bulb is converted into visible light by energy conversion in a fluorescent film formed on the globe. It becomes fluorescent.

In claim (2), the light emitted from the discharge bulb is reflected by a reflector or transmitted through the front lens and emitted in front of the lamp as direct light, but the ultraviolet rays generated along with the light emission from the discharge bulb are formed inside the front lens. The energy is converted into visible light (fluorescent light) in the fluorescent film.

In claim (3), the light emitted from the discharge bulb passes through the inner lens and is guided forward, but the ultraviolet rays generated along with the light emitted from the discharge bulb are converted into energy in the fluorescent film formed on the inner lens and become visible light. It becomes a fluorescent light.

In claim (4), most of the light emitted from the discharge bulb is reflected by the reflector and guided forward, but the ultraviolet light emitted along with the light emission from the discharge bulb is converted into energy in a fluorescent film formed on the surface of the reflector. It becomes fluorescent light, which is visible light.

〔Example〕

Next, embodiments of the present invention will be described based on the drawings.

FIG. 1 shows a vertical cross-sectional view of an automobile headlamp according to a first embodiment of the present invention, in which reference numeral 2 is supported within the lamp body 4 so as to be tiltable with respect to the lamp body 4 by an aiming mechanism (not shown). In this reflector, a parabolic light reflecting surface 2a formed by vapor-depositing aluminum is formed on the front side of the reflector. A bulb insertion hole 3 is formed at the rear top of the reflector 2, a discharge bulb 10 is inserted into the bulb insertion hole 3, and a front lens 6 is assembled into the front opening of the lamp body 4. It is integrated as a headlamp. Reference numeral 5 denotes a seal groove formed at the periphery of the front opening of the lamp body, and a seal leg 6a of the front lens 6 is engaged in this seal groove 5 via a sealant.

The discharge bulb 10 mainly includes a discharge lamp 12 which is a light emitting part, and lead supports 22 and 24 which protrude from an insulating base 20 and support the discharge lamp 12.
A globe 30 is attached to the insulating base 20 and completely covers the discharge lamp 12 and the lead supports 22,24.

The discharge lamp 12 has an ellipsoid-shaped sealed glass bulb 13 formed by pinching both ends of a quartz glass tube to form a discharge space.
It has a structure in which pinch parts 14, 14 are formed at both ends of the glass bulb 13, and a starting rare gas, mercury, and metal halide are sealed inside the glass bulb 13. Further, a discharge electrode 15.15 made of tungsten is arranged opposite to each other in the discharge space, and the discharge electrode 15.15 is arranged in the pinch portion 14. , 14, and a lead wire 18° 18 connected to the molybdenum foil 16 extends from the end of the pinch portion 14. Leads 4118.18 are insert-molded in the insulating base 20 and are a pair of long and short lead supports 22 and 24 that protrude from the front of the base.
a, 19b, and the discharge lamp 12 is connected to the lead support 22.24 via the lead wire 18.18.
The structure is supported at both ends. Note that the reference numeral 17 is an insulating cylinder made of ceramic for preventing discharge, which is fitted into the lead support 22 .

The globe 30 is a cylindrical glass body having a closed spherical tip and an open rear end. The glove 30 is fixed to the insulating base 20 by a means, so that the inside of the glove 30 is sealed. The means for fixing the glove 30 to the insulating base 20 include surrounding the outer peripheral surface of the glove with a metal band insert-molded on the base 20, or caulking a metal plate insert-molded on the insulating base into a recess on the glove side. Various fixing means can be considered, such as fixing the glove or fixing the glove using an inorganic adhesive.
It is fixed at 0.

A recess 3a is formed in the front peripheral edge of the bulb insertion hole 3 of the reflector 2, and the I! This facilitates fitting to the edge base 20 and caulking and fixing the metal plate 23. For details of the glove fixing means, please refer to the application
-12780, along with various specific examples.

The inner peripheral surface of the globe 30 is coated with a fluorescent film 32 that generates fluorescent light when exposed to ultraviolet rays, and this fluorescent film 32 emits visible light when exposed to the ultraviolet rays generated from the discharge lamp 12. Generates fluorescence. That is, the fluorescent film 3
At step 2, the energy of the ultraviolet rays is converted into visible light, or fluorescent light, and only the visible light is emitted outside the globe 30. As a result, only a small amount of ultraviolet rays are emitted from the headlamp. Of course, the visible light emitted by the discharge lamp 12 passes through the fluorescent film 32 and the front lens 6 and is distributed forward, so there is little loss in light distribution. In order to form the fluorescent film 32, fine particles of the fluorescent substance are dispersed in an inorganic binder, and this is applied to the inner peripheral surface of the glove by an appropriate method such as dipping or spraying.

Reference numeral 21 denotes a bulb socket integrally formed on the insulating base 20, and reference numeral 25 denotes a focusing ring integrally formed on the socket 21, which can be adjusted by an appropriate means such as a clip or a socket fixture (socket fixture 26 in the figure). By pressing this focusing ring 25 against the inner flange portion 3C of the bulb insertion hole 3, the discharge bulb 10 is inserted and fixed in the bulb insertion hole 3. Reference numeral 28 denotes a rubber cover that closes the rear opening 4a of the lamp body 4.

FIG. 2 is a longitudinal cross-sectional view of a main part of a headlamp according to a second embodiment of the present invention. In the embodiment described above, the glove 30
Although the globe 30A is fixedly held on the insulating base 20, as shown in FIG. 2, the globe 30A may be fixedly held on the valve insertion hole 3. That is, an inner flange 3C is provided around the front end side of the valve insertion hole 3, and this inner flange 3C is provided at the open end of the globe 30A.
An outer flange 31 that can be engaged with C is formed.

Then, insert the glove pressing fixing ring 3 into the valve insertion hole 3.
3 is inserted, and the globe 30A is fixed at the same time as the discharge bulb 10 is inserted and fixed. In addition, a light-shielding coating 33 called a black coat is formed on the outer peripheral surface of the tip of the glove 30A to prevent the emission of direct light, and the inner peripheral surface of the glove is coated with a fluorescent film 32 that generates fluorescence when exposed to ultraviolet rays. . Others are listed in 1 above.
The structure is the same as that of the embodiment, and the explanation thereof will be omitted by giving the same reference numerals.

In this embodiment, the globe 30A is engaged with the bulb insertion hole 3, and the globe 30A is inserted into the discharge bulb 10 at the same time.
Since it has a simple structure for fixing A, there is no need to provide special globe fixing means such as a metal plate 23 to the insulating base 20 as in the first embodiment, and furthermore, it is easy to assemble the headlamp. It also has excellent workability such as attachment and disassembly.

Further, in the first embodiment, in order to smoothly insert the glove 30 and to fix the glove 30 by caulking, a recess 3a is formed on the peripheral edge of the bulb insertion hole 3 of the reflector 2.
is formed, and the effective reflection area of the reflector 2 is correspondingly smaller. However, in this embodiment, the globe 30
Since A is engaged with the valve insertion hole 3 and held fixed,
The effective reflection surface of the reflector is formed up to a position where it comes into contact with the outer peripheral surface of the glove, and there is an advantage that the effective reflection area of the reflector is large.

Further, in the embodiment shown in FIGS. 1 and 2, the fluorescent film 32 is formed on the inside of the glove, but the fluorescent film may be formed on the outside of the glove, or on both the inside and outside. It may have a similar structure.

FIG. 3 shows a longitudinal sectional view of a headlamp according to a third embodiment of the present invention. In this embodiment, instead of the globe 30 shown in the first embodiment, an inner lens 34 coated with a fluorescent film 32 is arranged in front of the discharge bulb IO in the lamp body 4. ing. The inner lens 34 has an inner lens protrusion 34a engaged with a notch 5b formed in the inner wall 5a of the seal groove 5, is fixed to the inner wall 5a with adhesive, and is spaced apart from the back side of the front lens 6. The rest of the structure is the same as that of the first embodiment described above, and the explanation thereof will be omitted by giving the same reference numerals.

Most of the emitted light including ultraviolet rays from the discharge lamp 12 is reflected by the light reflecting surface 2a of the reflector 2 and becomes parallel light and heads forward, and some of the emitted light goes directly forward, but all of these lights It passes through the inner lens 34 and heads towards the front lens 6.

When the ultraviolet rays generated along with the emission of light from the discharge lamp 12 pass through the inner lens, their energy is converted into visible light (fluorescent light) in the fluorescent film 32 formed on the inner lens 34, so that the only light that passes through the inner lens is visible light. As a result, only a small amount of ultraviolet light is emitted from the Radolamp.

Further, in this embodiment, since the globe 30 is not provided, there is no need to form the recess 3a in the reflector 2 as in the first embodiment, and therefore the effective reflection area of the reflector 2 does not become small.

Note that in the third embodiment described above, the fluorescent film 32 was formed on the inside (back side) of the inner lens 34;
The fluorescent film 32 may be formed on the outside (front side) or both inside and outside (front and back) sides of the inner lens 34.

FIG. 4 shows a longitudinal sectional view of a headlamp according to a fourth embodiment of the present invention, in which the inner lens (see FIG. 3) on which the fluorescent film is formed is replaced with the inner lens (see FIG. 3). The back side) is coated with a fluorescent film 32 that generates fluorescence when exposed to ultraviolet light. Others are listed in the 3rd section above.
The structure is the same as that of the embodiment, and the explanation thereof will be omitted by giving the same reference numerals.

In this embodiment, the emitted light including ultraviolet light from the discharge lamp 12 passes through the front lens 6 and is distributed to the front of the pump, but the ultraviolet light is converted into visible light by the fluorescent film 32 formed on the front lens 6. Since it is converted into some fluorescent light, the amount of ultraviolet light emitted by headlamps is minimal.

FIG. 5 shows a longitudinal sectional view of a headlamp according to a fifth embodiment of the present invention. In this embodiment, the surface of the light reflecting surface 2a of the reflector 2, which is made of vapor-deposited aluminum, is coated with a fluorescent film 32 that generates fluorescent light when exposed to ultraviolet rays. Therefore, most of the light emitted from the discharge lamp 12 containing ultraviolet light is reflected by the reflector 2 and becomes parallel light toward the front lens 6, but the ultraviolet light is visible light on the fluorescent film 32 on the surface of the light reflecting surface 28. Since it is converted into fluorescent light, the amount of ultraviolet rays emitted by headlamps is minimal.

Furthermore, in the first to third embodiments shown in FIGS. 1 to 3 described above, a separate member on which the fluorescent film 32 is formed (globe 30.3OA in the first and second embodiments, glove 30.3OA in the third embodiment, In the example, it was necessary to place the inner lens 34) inside the lamp,
4. shown in FIGS. 4 and 5 above. In the fifth embodiment, the front lens 6 is essential as a component of the headlamp.
Since the fluorescent film 32 is formed on the reflector 2 and the reflector 2, there is an advantage that ultraviolet rays can be blocked without increasing the number of parts as in the first to third embodiments.

〔Effect of the invention〕

As is clear from the above description, according to the automobile headlamp according to the present invention, ultraviolet rays generated simultaneously with light emission in the discharge bulb are absorbed by the fluorescent film formed on the globe (in claim (2), the inner lens The formed fluorescent film (in claim (3), the fluorescent film formed on the back side of the front lens; in claim (4), the fluorescent film formed on the surface of the reflector) emits visible light. Since it is converted into fluorescent light, the amount of ultraviolet rays emitted from headlamps is reduced, eliminating various problems caused by ultraviolet rays emitted from headlamps.

In particular, since the amount of ultraviolet light transmitted through the front lens is reduced, it becomes possible to use a front lens made of synthetic resin, which could not be used in the past due to deterioration due to ultraviolet light.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view of an automobile headlamp according to a first embodiment of the present invention, FIG. 2 is a vertical cross-sectional view of main parts of a headlamp according to a second embodiment of the present invention, and FIG. FIG. 4 is a longitudinal sectional view of a headlamp which is a third embodiment of the invention, FIG. 5 is a longitudinal sectional view of a headlamp which is a fourth embodiment of the invention, and FIG. 5 is a longitudinal sectional view of a headlamp which is a fourth embodiment of the invention. FIG. 2 is a vertical cross-sectional view of a headlamp. 2...Reflector-54...Lamp body, 6...
Front lens, 10...discharge bulb, 12...discharge lamp, 30.3OA...globe, 32...
Fluorescent film, 34... Inner lens. Figure Patent Applicant Koito Seisakusho Co., Ltd. Representative Patent Attorney Hideto Yagi 4 Kura

Claims (4)

[Claims] (1) In an automobile headlamp in which a discharge bulb serving as a light source is provided in front of a reflector in the lamp body, and a front lens is assembled to the front opening of the lamp body, the discharge bulb is located inside or/and outside. A headlamp for an automobile, characterized in that it is completely covered by a tube-shaped globe with a closed end formed with a fluorescent film that emits light by ultraviolet rays. (2) In an automobile headlamp in which a discharge bulb as a light source is provided in front of a reflector in the lamp body, and a front lens is assembled in the front opening of the lamp body, light is emitted by ultraviolet rays inside and/or outside. A headlamp for an automobile, characterized in that an inner lens on which a fluorescent film is formed is arranged in front of the discharge bulb. (3) In an automobile headlamp in which a discharge bulb as a light source is provided in front of a reflector in the lamp body and a front lens is assembled to the front opening of the lamp body, the back side of the front lens emits light by ultraviolet rays. An automobile headlamp characterized by having a fluorescent film formed thereon. (4) In an automobile headlamp in which a discharge bulb serving as a light source is provided in front of a reflector in the lamp body, and a front lens is assembled to the front opening of the lamp body, the surface of the reflector is equipped with a fluorescent light emitted by ultraviolet rays. An automobile headlamp characterized by having a light film formed thereon.