JP3152072B2 - Vehicle lighting - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicular lamp, and more particularly to a vehicular lamp using a rod-shaped light source.

[0002]

2. Description of the Related Art Hitherto, as a light source used for a vehicle lamp, a bulb type light source such as a halogen lamp or an incandescent lamp, or a light emitting diode has been used.

[0003] Halogen lamps are mainly used for lamps with a high light quantity such as headlamps, incandescent lamps are mainly used for rear combination lamps and the like, and light emitting diodes are mainly used for high mount stop lamps and the like.

[0004] In the case of an automobile, this high-mount stop lamp is independent of the rear combination lamp and located at a high position, for example, a trunk lid,
It is arranged at a relatively high portion, such as a rear spoiler, a tonneau board, a molded ceiling, and the like, and has a relatively elongated light emitting surface due to its installation space.

[0005] Accordingly, incandescent lamps have disadvantages such as the installation space and the inability to obtain uniform surface light emission. Therefore, as a light source for a high-mount stop lamp, a large number of light sources are fixedly arranged on a predetermined substrate. It is customary to use a costly light emitting diode which requires a unique and complicated assembly process.

In order to satisfy the conditions of a vehicular lamp such as a rear combination lamp and the conditions of a high-mount stop lamp, the applicant of the present application has a method of emitting light of a uniform light amount while being cheaper than a light emitting diode. We have newly developed a vehicular lamp that uses a rod-shaped light source to obtain a surface.

FIGS. 8A and 8B show a lamp body T of a vehicular lamp using such a rod-shaped light source 1.
The jigs 2 and 2 are held in contact with the jigs 2 and 2
2 is fixed to the housing 4 by screws 3, 3,..., And is held between the projecting portion 4a of the housing 4 and the jigs 2, 2.

The housing 4 holds the reflector 5 in close contact. The reflector 5 is formed with holes 5a, 5a through which protrusions 4b, 4b,... Protruding from the housing 4 are inserted, and an opening 5b through which the light source 1 and the jigs 2, 2 are inserted. The reflector 5 is held by the housing 4 by inserting the projections 4b, 4b,.

[0009]

By the way, in the vehicular lamp configured as described above, the jigs 2 and 2 for holding the light source 1 and the screws 3 are used.
Not only does the cost of parts and assembly increase, but also the problem that it is difficult to obtain a uniform light emitting surface due to the presence of the jigs 2 and 2 and the opening 5a has arisen.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a vehicle lamp capable of reducing the number of parts, reducing the assembly cost, and obtaining uniform surface light emission. The purpose is to do.

[0011]

According to one aspect of the present invention, there is provided a rod-shaped light source, a housing having an abutting surface that abuts a part of the light source, and the abutting surface. The gist of the invention is to provide a transparent body having a groove for sandwiching the light source, and a reflective film coated on the surface of the transparent body excluding the groove.

[0012]

In such a configuration, the rod-shaped light source is sandwiched between the contact surface of the housing and the groove of the transparent body, and the light beam emitted from the light source passes through the groove of the transparent body and is reflected by the reflection film. .

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

In FIGS. 1A to 2, reference numeral 10 denotes a lamp body of a vehicular lamp, a rod-shaped light source 11, a housing 12 having an abutting surface 12 a which abuts a part of the light source 11, and a contact surface A transparent body 13 having a groove 13a sandwiching the light source 11 with the transparent body 12a, and a surface 1 of the transparent body 13 excluding the groove 13a.
3b.

The housing 12 has a parabolic wall 12.
b, and a projection 12c protruding from the wall 12b toward the focal point of the wall 12b. The contact surface 12a is the protrusion 1
An arc is formed at the tip of 2c. The protrusion 12
The protrusion amount of c is set such that the light source 11 is located at the focal point of the paraboloid when the light source 11 is brought into contact.

The shape of the wall 12b is not particularly limited as long as its front surface is parabolic. The contact surface 12a is provided over substantially the entire width in the length direction of the light source 11, but may be provided scattered in the length direction of the light source 11. Furthermore, although the abutment surface 12a is disclosed as being formed in an arc shape so as to be along the outer wall surface of the light source 11, for example, as disclosed in the related art, a part thereof is linearly formed in the longitudinal direction of the light source 11. The shape is not particularly limited as long as the condition of the amount of protrusion is satisfied, such as a planar shape that comes into contact with the shape.

When a fluorescent tube or the like that does not emit heat is used for the light source 11, the transparent body 13 is formed from a material such as PMMA to be colorless or colored (for example, red) transparent.
When an incandescent tube or the like that generates heat is used, it is formed from a heat-resistant resin material to be colorless or colored and transparent. The transparent body 13 includes a wall 13c having a parabolic shape, and the groove 1
3a is formed in a tunnel shape from the center of the wall portion 13c toward the focal point side of the wall portion 13b, thereby forming a groove 13d facing the light source 11 and the projection 12c.

The groove 13a is formed over the entire width of the light source 11. The parabolic surface is a parabolic surface in the fore-edge direction because the light source 11 has a rod shape, but the longitudinal direction is shown in FIG.
As shown in FIG. Furthermore, when it is not necessary to convert the light beam emitted from the light source 11 into a parallel light beam, the walls 12b and 13c do not need to be particularly parabolic as long as they can be in close contact with each other.

The reflection film 14 is coated only on the portion excluding the groove 13a, that is, on the paraboloid on the surface 13b side of the wall 13c so as to maintain the transparent state of the groove 13a.

In such a configuration, as shown in FIG. 1A, a rod-shaped light source 11 is connected to a contact surface 1 of a housing 12.
The light source 11 is fixed simply by coupling the housing 12 and the transparent body 13 so as to be sandwiched between the 2a and the groove 13a of the transparent body 13. In addition, the connection between the housing 12 and the transparent body 13 includes bonding by an adhesive and the like in addition to the cold caulking in the above-described conventional technology.

The light beam P emitted from the light source 11 is shown in FIG.
As shown in (B), the light passes through the groove 13a of the transparent body 13 and is reflected by the reflection film 14 to become a parallel light flux.

At this time, as shown in FIG. 1 (C), the light beam P has a rod-shaped light source 11 over the entire width of the lamp body 10, so that illumination light of uniform surface emission can be obtained.

Further, the lamp body 1 assembled as described above.
0 denotes the rear cover 15 and the lens 16 as shown in FIG.
And is used as a vehicle lamp 18 such as a high-mount stop lamp.

On the other hand, as shown in FIG.
A vehicle lamp 28 having a lamp body 20 integrally formed with a cover portion 25 corresponding to the above-described rear cover 15. As shown in FIG. 5, the housing 32 is extruded to form the housing 32 into the rear cover 15 and the lens 16. The technical scope of the lamp body applied as the vehicle lamp, such as the vehicle lamp 38 having the lamp body 30 in which the corresponding cover part 32a and lens part 32b are integrally formed in a tubular shape from a transparent material, is limited to the above-described example. Not something. Further, a cylindrical prism 32c may be formed on the lens portion 32b. 4 and 5, the same components as those in the above embodiment are denoted by the same reference numerals, and description thereof will be omitted.

On the other hand, as shown in FIG.
Is formed on the inner surface of a semicircular groove 42b extending in the longitudinal direction of the light source 11 and the groove 43 of the transparent body 43 is formed.
The lamp body a may be a semicircular arc shape extending in the longitudinal direction of the light source 11.

At this time, as shown in FIG. 7, a prism 43b may be formed in the groove 43a. In addition, this prism 4
The range of formation of the groove 3b in the groove 43a is set so that a light beam directly traveling from the light source 11 to the reflective film 14 is transmitted as it is, and a light beam not traveling from the light source 11 to the reflective film 14 is scattered.

[0027]

As described above, in the vehicular lamp according to the present invention, the light source is sandwiched between the rod-shaped light source, the housing having the contact surface that contacts a part of the light source, and the contact surface. By having a transparent body having a groove to be formed and a reflective film coated on the surface excluding the groove of the transparent body, it is possible to reduce the number of parts and reduce the assembly cost, and
Uniform surface light emission can be obtained.

[Brief description of the drawings]

FIG. 1 shows a vehicular lamp of the present invention, wherein (A) is a longitudinal sectional view of a lamp body before a reflector is mounted on a housing,
(B) is a longitudinal sectional view of a lamp body with a reflector mounted on a housing, and (C) is a front view of the lamp body with a reflector mounted on a housing.

FIG. 2 is a perspective view of a lamp body in which a reflector is mounted on a housing.

FIG. 3 is a vertical sectional view of the vehicle lamp.

FIG. 4 is a longitudinal sectional view of a vehicle lamp according to a second embodiment of the present invention.

FIG. 5 is a longitudinal sectional view of a vehicle lamp according to a third embodiment of the present invention.

FIG. 6 is a longitudinal sectional view showing a fourth embodiment of the vehicular lamp according to the present invention, in which a reflector is mounted on a housing.

FIG. 7 is a longitudinal sectional view showing a fifth embodiment of a vehicle lamp according to the present invention, in which a reflector is mounted on a housing.

8A and 8B show a conventional vehicle lamp, in which FIG. 8A is a longitudinal sectional view of a lamp body with a reflector mounted on a housing, and FIG. 8B is a front view of the lamp body with a reflector mounted on a housing.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Lamp main body 11 ... Light source 12 ... Housing 12a ... Contact surface 13 ... Transparent body 13a ... Groove part 13b ... Surface 14 ... Reflective coating 18 ... Vehicle lamp

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F21S 8/10 G02B 5/26 F21M 3/08 F21M 3/28 F21V 19/00 B60Q 1/44 B60Q 9 / 00

Claims (3)

(57) [Claims] 1. A light source comprising: a rod-shaped light source; a housing having a contact surface in contact with a part of the light source; and a transparent body having a groove for holding the light source between the contact surface. Vehicle lighting device. 2. The vehicular lamp according to claim 1, wherein a reflection coating is provided on a surface of the transparent body excluding the groove. 3. The vehicular lamp according to claim 1, wherein the housing and the transparent body have parabolic surfaces that are in close contact with each other when the light source is sandwiched.