JPH04107208U - Vehicle lighting - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a lighting lamp for a vehicle that can provide high-intensity illumination by increasing the efficiency of light incidence into an optical fiber. [Structure] A light source is placed at the first focal point of a spheroidal reflecting body, and a light incident end face of an optical fiber is placed at a second focal point of the reflecting body, and the light source light incident on the light incident end face is directed to a predetermined direction. In a vehicle illumination lamp that emits light from a light emitting end face of an optical fiber oriented in a direction for illumination, a pair of ellipsoidal reflectors 13A and _13B are arranged such that the reflector bodies 12 are arranged facing each other with the first focal point f1 coincident. A light source 10 is provided at the first focal point f ₁ common to the reflecting mirrors 13A and 13B.
and the second focal point f ₂ of each reflecting mirror.
A central through hole 14 is formed in each of the opposing reflecting mirrors.
The light incident end faces 21A and 21B of the optical fibers 20A and 20B are arranged through the optical fibers 20A and 20B.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention makes the light from the optical fiber enter the light input end of the optical fiber. The present invention relates to a vehicle illumination lamp that emits light from an output end and distributes the light.

0002

[Conventional technology]

As a prior art of this type, there is Japanese Patent Application No. 2-185310. this is a car As shown in Figure 5, this is a technology related to headlamps for 2, a light source 3 is provided at the first focal point of the optical fiber, and a light incident end face 4a is located at the second focal point. A bar bundle 4 is arranged, and the optical fiber bundle 4 is branched in the middle to emit light from each optical fiber. It has a structure in which a lens 5 for light distribution control is provided in front of the emission end surfaces 4b, 4b, . . . .

0003

[Problem that the idea aims to solve]

However, in the prior art described above, light other than the light reflected by the reflecting mirror 2 is effectively transmitted through the optical filter. Since the light is not guided to the light incident end face 4a of the fiber bundle 4, the light incidence efficiency is poor and there is insufficient light. There was a problem that illuminance could not be obtained. The present invention was devised in view of the problems of the prior art, and its purpose is to To provide a lighting lamp for a vehicle that can provide high-intensity illumination by increasing the efficiency of light incident on the vehicle. It is in.

0004

[Means to solve the problem]

In order to achieve the above object, the vehicle lighting lamp according to the present invention has a spheroidal shape. A light source is placed at the first focal point of the body-shaped reflecting body, and the second focal point of the reflecting body is placed at the second focal point of the body-shaped reflecting body. The light input end face of the optical fiber is placed at For vehicle lighting lamps that emit light from the light output end face of an optical fiber facing the direction. and the reflecting mirror bodies are ellipsoidal reflecting mirrors arranged oppositely with their first focal points coincident. A light source is arranged at a common first focus of the reflecting mirror, and a light source is disposed at a common first focus of the reflecting mirror. At the second focal point of each reflecting mirror, there is a central through hole formed in each of the opposing reflecting mirrors. The light incident end face of the optical fiber is arranged through the optical fiber.

[0005] Further, in claim 2, the light source is a line light source, and the longitudinal direction of the light source is reflected. It is arranged perpendicular to the optical axis of the mirror.

[0006]

[Effect]

The light source light is reflected by the reflecting mirrors facing each other with the light source in between, and each second The light enters the light incident end face of the optical fiber located at the focal point. In the second aspect of the present invention, direct light of high luminous intensity is incident on the light incident end face from the line light source.

[0007]

【Example】

Next, embodiments of the present invention will be described based on the drawings. Figures 1 and 2 show an example in which the present invention is applied to an automobile headlamp. Figure 1 is a perspective view showing the overall configuration of the headlamp, and Figure 2 is an enlarged longitudinal section around the light source. It is a diagram.

[0008] In these figures, numeral 10 is an incandescent bulb that is a light source, and the opening of a pair of bowls is It is disposed within a reflecting mirror body 12 that has an integrated shape with its sides joined together. reflective body 12 is a pair of ellipsoidal reflectors 13A and 13B with their mirror surfaces facing each other. The reflectors 13A and 13B have a central through hole at the rear top. 14 is formed, and the optical fiber bundles 20A and 20B enter the central through hole 14. The emitting end portions 21, 21 are inserted. The optical fiber bundles 20A, 20B include a large number of optical fiber bundles 20A, 20B. Optical fibers 22 (22a to 2 2g) is focused and integrated by the base 24 on the light incident end side. , at the light input end, one optical fiber bundle is connected to each optical fiber from the middle at the light output end. -22 (22a to 22g), and each optical fiber is arranged in a predetermined direction. A base 25 is also attached to the light emitting end 23 of the bar 22. And each light comes out A lens 28 for light distribution control is arranged in front of the emitting end portion 23. Note that the cap 24 A flange 24a is formed on the flange 24a, and the base 24 is inserted into the center through hole 1 of the reflector. 4, and insert the light incident end 21 of the optical fiber into the center using the cap-shaped fastener 24b. It is fixed in the central through hole 14.

[0009] The pair of reflectors 13A and 13B constituting the reflecting mirror body 12 have the same shape such that the relationship between the first focal length F ₁ and the second focal length F ₂ is F ₂ =2F ₁ . They are integrated so that they face each other so that the first focal points f ₁ coincide. That is, the reflectors 13A and 13B have a common first focal point _f1 . A bulb insertion hole 15 is formed in the portion of the reflector body 12 where the reflectors 13A and 13B meet, and the bulb 10 is inserted therein. The filament 11 of the bulb 10 is located at the first focus f ₁ of the reflectors 13A, 13B, and the light emitted from the filament 11 is reflected by the reflectors 13A, 13B as shown by the arrow in FIG. The light is focused on ₂ . The end faces 21A, 21B of the light incident ends 21, 21 of the optical fiber bundles 20A, 20B are located at the respective _second focal points f2, and the reflected light from the reflectors 13A, 13B is reflected from these light incident end faces. The light enters 21A and 21B, respectively.

Further, the filament 11, which is a light emitting part, is vertically long and arranged so that the longitudinal direction of the filament is perpendicular to the optical axis L of the reflectors 13A, 13B. is also incident. That is, FIG. 3 is a diagram showing the luminous intensity distribution around the linear light source H, and shows the surface of a rotating body whose axis is the extending direction Y of the light source H, where d(θ)=d ₀ √si nθ (where d is the light intensity distribution of the light source H). The distance from the center (d ₀ indicates the reference luminous intensity at θ = 0) is the uniform luminous intensity, and for a line light source, the inclination angle θ with respect to the axis Y is π/2 The luminous intensity in the vicinity area A (around the center in the longitudinal direction of the light source) is the highest, and as the inclination angle θ approaches O 2 or π, the luminous intensity decreases. Therefore, in this embodiment, the filament 11 and the light incident end surfaces 21A, 21B are arranged orthogonally to each other so that the direct light having the maximum luminous intensity can enter the light incident end surfaces 21A, 21B.

[0011] Further, the light source light incident on the incident end surfaces 21A and 21B is transmitted to the branched optical fiber 2. The light is emitted from each light emitting end 23 of 2a to 22g, and is flattened by a collimator lens 28a. The light is then distributed forward through the diffusion/output direction control lens 28b. It has become so. Note that the reference numeral 18 is arranged in front of the light incident end surfaces 21A and 21B. A heat ray absorption (or heat ray reflection) filter directed toward the light incident end surfaces 21A and 21B. By absorbing (or reflecting) heat from such light, it is possible to absorb heat from the concentrated light. It is designed to protect optical fibers.

0012 Furthermore, the light emitting end portions 23 of each of the optical fibers 22a to 22g are respectively placed in the base 25. It is molded and held in a predetermined shape by a retainer member 26. and optical fiber The light emitted from each of the light emitting end faces 23a to 23g having a predetermined shape of the fiber is distributed A predetermined divided light distribution pattern is created by passing through the control lens 28 (28a, 28b). This results in the formation of a zone. These divided light distribution patterns are then combined to produce light. The light distribution pattern for the main beam in fiber bundle 20A is different from that in optical fiber bundle 20B. On each side, sub-beam light distribution patterns are formed.

In the above embodiment, the focal length is set to F ₂ =2F ₁ , but with this setting, the light incident end surface of the optical fiber is flush with the light reflecting surface of the reflector, and the light incident efficiency is increased. is the maximum. Further, in the above embodiment, the reflectors 13A and 13B have the same shape, but as shown in _{FIG .} The pair of reflectors do not need to have the same shape as long as the light incident end faces 21A and 21B of the optical fibers are arranged at .

[0014] In addition, in the above embodiment, the light source was explained as an incandescent bulb, but a metal halide bulb was used as the light source. Discharge bulbs, such as double-head bulbs, and other types of bulbs with line light sources. You can.

[0015]

[Effect of the idea]

As is clear from the above explanation, according to the vehicle lighting lamp according to the present invention, the light source can be The light source light reflected by the reflecting mirrors that are sandwiched and facing each other is distributed to the respective second focal points. Since the light is focused and incident on the light input end face of the placed optical fiber, the light source light becomes one light beam. The light incidence efficiency is improved compared to the case where the light is focused and incident on the incident end face. Also light incident Since the efficiency of light incidence on the end face is improved, high-intensity illumination can be obtained, making visibility easier. Improves sex.

[0016] In claim 2, since the direct light of high luminous intensity from the line light source is incident on the light incident end face, the incident Efficiency is further improved and even higher intensity illumination is obtained.

[Brief explanation of drawings]

[Fig. 1] Overall schematic diagram of an automobile headlamp, which is the first embodiment of the present invention.

[Figure 2] Enlarged cross-sectional view around the light source

[Figure 3] Diagram showing the luminous intensity distribution of a line light source

[Fig. 4] Enlarged cross-sectional view of main parts of another embodiment of the present invention

[Figure 5] Schematic diagram of prior art

[Explanation of symbols]

10 Incandescent bulb as a light source 11 Filament 12 Reflector 13A, 13B Reflector (reflector) 14 Central through hole 20A, 20B Optical fiber bundle 21 Light incidence end of optical fiber 21A, 21B Light incidence end face 22 (22a to 22g) of optical fiber Optical fiber 23 Light output end portions 23a to 23g of optical fiber Light output end face f of optical fiber ₁ First focal point f ₂ Second focal point L Optical axis of reflector

Claims (2)

[Scope of utility model registration request] 1. A light source is disposed at a first focal point of a spheroidal reflecting body, and a light incident end face of an optical fiber is disposed at a second focal point of the reflecting body, and the light source light incident on the light incident end face is In a vehicle illumination lamp that emits light from a light emitting end face of an optical fiber oriented in a predetermined direction for illumination, the reflecting mirror body is composed of a pair of ellipsoidal reflecting mirrors arranged facing each other with their first focal points coincident, A light source is disposed at a common first focal point of the reflecting mirrors, and a light source is provided at a second focal point of each reflecting mirror through a central through hole formed in each of the opposing reflecting mirrors. A vehicle lighting lamp characterized by having an end face arranged. 2. The light source is a line light source, and
2. The vehicle illumination lamp according to claim 1, wherein the light source is disposed with its longitudinal direction perpendicular to the optical axis of the reflecting mirror.