JPH02152102A - Lighting fixture for vehicle - Google Patents

Abstract

PURPOSE:To prevent a local temperature rise within a lighting fixture by providing a lens cut part for diffusing or totally reflecting external light on the upper part of a projector lens within a portion other than the light transmission range of the projector lens of front lenses. CONSTITUTION:A bulb 3 is positioned at the rear opening part of a housing 1 and a spherical reflector 4 with the position of the bulb 3 as the first focal point of an ellipse is provided around the aforesaid bulb 3. Also, a resin inner cover 9 is fitted on the external surface of the housing 1 around the projector lens 8. The cover 9 is fitted with an aluminum shade ring 10 surrounding the projector lens 8 and this ring 10 shades external light incident to the lens 8 such as sunlight. In addition, the housing 1 is provided with a transparent front lens 11 continuous to a body 2, ranging from the upper part of the projector lens 8 to the front position thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a vehicle lamp, and particularly to a vehicle lamp using a projector lens.

Vehicle lamps using conventional technology projector lenses have a sharp cut line like a projector to prevent dazzling oncoming vehicles due to upward leakage light that occurs even when the headlights are directed downward. (distinction between light and dark) to eliminate light leaking upward.

Specifically, the bulb is used as a light source, and light is projected onto a projector lens provided in front of the bulb using a concave mirror flap placed around the bulb, and the cut line is projected from the front lens provided in front of the projector lens. (This type of technology includes, for example, Japanese Patent Application Laid-Open No. 58103701, Japanese Patent Laid-open No. 58-20980).
(as shown in Publication No. 1).

Problems to be Solved by the Invention Since the front lens is transparent because it is necessary to transmit light from the projector lens due to its nature,
On the other hand, a problem arises in that the functional parts provided inside are visible from the outside, impairing the quality of the exterior appearance.

Additionally, since the projector lens is an optically convex lens, it is possible that localized temperature increases may occur when sunlight is concentrated, so countermeasures such as forming the housing with heat-resistant resin or metal are recommended. There is also the problem that this becomes necessary and leads to high costs.

On the other hand, as a heat countermeasure, it is possible to adopt the technology of providing radiation fins on the housing as shown in Japanese Utility Model Application Publication No. 62-131303, but this requires a gap between the housing and the vehicle body, which requires a large amount of space. There is a problem.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a vehicular lamp that can improve the appearance quality and prevent a local temperature rise inside the lamp due to sunlight converged by a projector lens.

Means for Solving the Problems In a vehicle lamp in which a projector lens is arranged in front of a bulb and a front lens that covers the projector lens is arranged, a portion of the front lens outside the light transmission range of the projector lens is provided. Diffusing external light to at least a portion located above the projector lens,
Alternatively, a lens cut portion for total reflection is provided.

Effect: For example, when sunlight shines into a curved lens from above, the light passes through the front lens through the lens cut section provided on the front lens, and then is diffused or totally reflected, causing the sunlight to Avoid convergence internally. Furthermore, since the lens cut portion is provided at least on the upper part of the front lens, which is easily visible from the outside, it becomes difficult to see the inside.

Example Embodiments of the present invention will be described below with reference to the drawings.

In Figs. 1 to 4, 1 indicates a metal housing;
It is attached to an opening formed in the vehicle body 2, and the lower half protrudes more forward than the upper half.

A valve 3 is disposed in the rear opening of the housing 1, and the position of the valve 3 is placed at the first ellipse around the valve 3.
A focused spherical glue flaper 4 is provided.

This reflector 4 has a mirror surface formed on its inner circumferential surface by vapor deposition or the like, and its front edge is provided with resin mounting parts 5 at four locations on the top, bottom, left and right, where a support frame 7 is attached with screws 6. installed.

A projector lens 8, which is a plano-convex lens, is attached to the front part of the support frame 7 by a fixture (not shown).

On the other hand, a resin inch cover 9 is attached to the inner surface of the surface housing 1 around the projector lens 8, and an aluminum light shielding ring 10 that surrounds the projector lens 8 is attached to this inner cover 9. .

The light shielding ring 10 blocks light, such as sunlight, that enters the projector lens 8 from the outside.

A transparent front lens 11 connected to the vehicle body 2 is attached to the housing l from above the projector lens 8 to the front position.

The lower edge of the front lens 11 is attached to the lower edge of the housing I, and the joint between the two is covered by a clip 12a. The upper edge of the housing 1 is overlapped with the upper edge of the housing 1, and a sealing material 12b at the end of the panel of the vehicle body 2 is closely attached.

Above front lens! The upper part of 1 extends forward along the outer surface of the vehicle body 2, and there is a lens cut part! 3
is formed.

That is, the lens cut portion 13 only needs to be formed at least above the light transmission range A of the projector lens 8, and in this embodiment, the lens cut portion 13 is formed above the boundary of the light transmission range A in the case of high beam. It is being

As shown in FIG.
(approximately JI11) is formed continuously by convex arcuate portions 15, and incident sunlight is refracted and diffused in the large arcuate portions 14. On the other hand, since the radius of the small arcuate portion 15 is extremely small, the amount of light rays condensed is extremely small, and this lens cut portion I3
will diffuse the incident light beam as a whole.

According to the structure of the above embodiment, when sunlight enters the front lens 11 from above, this beam of light passes through the lens cut portion 13 and proceeds toward the projector lens 8. Due mainly to the function of the arcuate portion 14 as a concave lens, the transmitted light becomes mutually diffused light rays.

Therefore, these diffused light beams are transmitted to the projector lens 8.
Even if the light is incident on the projector lens 8, it will not be focused when exiting from the projector lens 8, and no special arrangement of heat-resistant resin, metal, or the like is required to avoid a local temperature rise in the inch cover 9 or the like.

Furthermore, in this embodiment, a light shielding ring is provided around the projector lens 8! 0 especially this light blocking ring 10
Since the upper edge portion of the projector lens 8 blocks the light incident on the projector lens 8 from above, it is possible to more reliably avoid a localized temperature rise. Further, since the shape and size of the light shielding ring IO are limited due to the relationship with the light transmission range A, the combined use with the lens cut portion is more effective.

Furthermore, since the lens cut portion 13 is formed at the top of the front lens 11 where it is most visible, the arc-shaped portion of the front lens II! 4 and the arcuate portion I5 can prevent the functional parts inside from being visible from the outside, thus improving the appearance quality.

Next, FIG. 5 is an enlarged sectional view of the lens cut portion 16 of a second embodiment of the present invention.

The lens cut portion 16 of this embodiment is similar to the previous embodiment in that it is provided above the boundary of the light transmission range A of the projector lens 8, but this lens cut 61 (+6 is The surface is formed into a saw-tooth shape, and when sunlight enters, this incident light is transmitted to the front lens 11.
Each cut surface 16a is formed so that the angle is greater than or equal to the critical angle of the resin or glass forming the cut surface.

Therefore, in this embodiment, sunlight is transmitted to the lens cut portion 1.
6, the incident light is totally reflected on each cut surface 16a formed in a sawtooth shape and is emitted to the outside, so that it does not reach the projector lens S, thus causing the local temperature rise mentioned above. Never.

Next, FIG. 6 is an enlarged sectional view of the lens cut portion 17 of a third embodiment of the present invention.

The lens cut portion 17 of this embodiment is formed with a plurality of large concave arcuate portions 18 on its back surface.
In the general portion 18a of this arcuate portion I8, the incident light beam is refracted and diffused as in the first embodiment, while each arcuate portion 1
In the vicinity of the junction 18b of 8, the incident sunlight is totally reflected as explained in the second embodiment, and in either case, the incident rays are focused by the projector lens 8, causing a local temperature rise. It is possible to reliably prevent such situations from occurring.

As described in detail, according to the invention described in claim 1, even if sunlight that has passed through the upper part of the front lens enters the projector lens, the lens cut portion of the front lens can be cut off. The passing light beam is diffused, so it does not converge when it passes through the projector lens, so there is no local temperature rise inside the lamp due to the focused light beam, and each part is made of heat-resistant resin or metal. This eliminates the need for measures such as
I can do it.

Furthermore, since the lens cut portion is provided at least on the upper part of the front lens, which is most visible from the outside, internal functional components are not visible from the outside, and therefore, the quality of the appearance can be improved.

On the other hand, according to the invention described in claim 2, even if sunlight enters the upper part of the front lens, this bundle of light rays is totally reflected at the lens cut part and returns again to the direction from which the sunlight entered. Therefore, the sunlight does not enter the projector lens, and therefore there is no need to take measures to prevent a local temperature rise due to sunlight being focused by the projector lens, and costs can be reduced. It should be noted that, similar to the invention described in claim I, the lens cut portion makes it impossible to see the inside from the upper part of the front lens, which is most visible to the public, so that the appearance quality can be improved.

[Brief explanation of the drawing]

Fig. 1 is an overall side explanatory view of Embodiment 2 of this invention;
The figure is a top view of the same, Figure 3 is a sectional view of the main part of Figure 2, Figure 4 is an enlarged view of the main part of Figure 3, and Figure 5 is a sectional view corresponding to Figure 4 of the second embodiment. , FIG. 6 is a sectional view corresponding to FIG. 4 of the third embodiment. 3... Pulp, 8... Projector lens, ■1.
...Front lens, +3.16.17...Lens cut part, A...Light transmission range. 13(it) Fig. 1 3 ・Bulb 8 Projector lens 11 ・Front lens +3... Lens cut part A... Light transmission range Fig. 4 Fig. 5 Fig. 6

Claims (2)

[Claims] (1) A projector lens is placed in front of the bulb,
In a vehicle lamp in which a front lens that covers a projector lens is arranged, a lens cut that diffuses external light to a portion of the front lens outside the light transmission range of the projector lens and located at least above the projector lens. A vehicle lamp characterized in that a vehicle lamp is provided with a section. (2) In a vehicle lamp in which a projector lens is arranged in front of the bulb and a front lens that covers the projector lens is arranged, a portion of the front lens outside the light transmission range of the projector lens and at least above the projector lens. A vehicular lamp characterized in that a lens cut portion for totally reflecting external light is provided at a portion located at .