JPH0538483Y2 - - Google Patents

Description

[Detailed Description of the Invention] The vehicle lamp of the present invention will be explained according to the following items.

A. Field of industrial application B. Overview of the invention C. Prior art D. Problem that the invention attempts to solve E. Means for solving the problem F. Example a. Overview [Figure 1] b. Inner lens [Figures 1 to 1] [Figure 4] c Reflection prism [Figure 2, Figure 3 A, B] d Fisheye lens step [Figure 4] e Outer lens [Figure 1] f Formation of the reflective surface of the reflection prism [Figure 5] G Design Effects (A. Field of Industrial Application) The present invention relates to a new vehicle lamp, in particular a lamp with a structure that prevents false lighting caused by sunlight, etc., and it facilitates the manufacture of the lamp and also improves the lens surface during lighting. The aim is to make the brightness of the light uniform.

(B. Summary of the invention) The vehicle lamp of the present invention prevents false lighting by forming reflective prisms concentrically around the periphery of the lens surface, and also makes it easier to apply a reflective film to the reflective surface. Furthermore, by forming a diffusion lens element on the lens surface near the light source, it is attempted to make the brightness of the lens uniform.

(C Prior Art) Generally speaking, when a vehicle light is irradiated with intense sunlight from the front of the vehicle light, the sunlight enters the interior through a lens, and is further reflected by the reflective surface of the light, resulting in light emitting light. A ray of light parallel to the axis passes through the lens. For this reason, when sunlight that passes through the lens reaches the eyes of a driver, etc., it causes the vehicle lamp to appear as if it were actually turned on, that is, to cause false lighting.
This makes it difficult to identify the vehicle lamp.

Therefore, in order to prevent false lighting caused by sunlight or the like, there is a method disclosed in, for example, Japanese Utility Model Application No. 58-179705.

That is, in the lamp described in the above-mentioned publication, a reflective prism element extending horizontally is formed continuously in the vertical direction on the lens surface.

(Problem to be solved by the D idea) However, in the conventional lighting device as described above, the reflective prism element was formed to extend in the horizontal direction, so the reflective prism element had a substantially uniform reflective film. I was unable to do so.

That is, when applying a reflective film to a reflective prism element, vapor deposition is performed by placing a vapor deposition source facing the reflecting prism forming surface of the lens, but even if the vapor deposition source is placed at a position appropriately spaced from the lens on the central axis of the lens However, since the distance to the evaporation source is different between both ends and the center of the horizontally extending reflective surface of the reflective prism element, the film thickness is thicker at the part closest to the evaporation source, and thicker at the part farthest from the evaporation source. The film thickness becomes thinner. Therefore, it has not been possible to make the reflective film uniform over the entire horizontally extending reflective surface of the reflective prism element.

(E. Means for Solving the Problems) In order to solve the above-mentioned problems, the vehicle lamp of the present invention has reflective prisms formed concentrically around the periphery of the lens surface, and the center axis of the lens of the reflective prisms. A vapor-deposited film is applied to the reflective surface facing toward.

Therefore, according to the vehicle lamp of the present invention, if the vapor deposition source is placed at a position appropriately spaced from the lens on the central axis of the lens, a uniform reflective film can be applied over the entire reflective surface of one reflective prism. be able to.

In addition, the vehicle lamp of the present invention solves the problem of forming reflective prism elements concentrically, that is, a ring-shaped pattern appears on the lens surface, by forming a diffusing lens element on the lens surface near the light source. The problem can be solved by

(F Example) Below, the details of the vehicle lamp of the present invention will be explained according to Example 1, which is illustrated.

(a Overview) [FIG. 1] Reference numeral 2 in the figure is a reflecting mirror having a reflecting surface formed of a paraboloid of revolution, and a light bulb 3 for a light source is disposed at the focal point of the reflecting mirror 2.

Reference numeral 4 denotes an inner lens arranged to cover the front opening of the reflecting mirror 2, and an outer lens 5 is further arranged in front of the inner lens 4.

(b Inner lens) [Figures 1 to 4] On the front surface of the inner lens 4, near the light source, in other words, near the light source 4a, there are formed fisheye lens steps 6, 6, . . . that are approximately semicircular. In addition, reflecting prisms 7, 7, . . . are formed concentrically on the peripheral portion 4b of the front surface, and a semi-cylindrical shape is formed on the back surface of the lens at the portion where the reflecting prisms 7, 7, . The lens elements 8, 8, . . . are formed concentrically.

Further, reflective surfaces 9, 9, . . . are formed by vacuum deposition on the surfaces of the reflecting prisms 7, 7, .

(c Reflection Prism) [FIGS. 2 and 3A, B] The reflection prisms 7, 7, . . . formed concentrically on the peripheral portion 4b of the front surface of the inner lens 4 function as follows.

That is, when the light source bulb 3 lights up, the reflected light a, which is made into parallel light by the paraboloid of revolution reflector 2, becomes a third parallel light beam.
As shown in Figures A and B, it passes through the inner lens 4, is reflected by the reflective surface 9a of the reflective prism 7a, passes through the transparent surface 10a of the reflective prism 7a, and then passes through the reflective surface 9b of the reflective prism 7b located at the lower stage. The light is reflected by the light, passes through the outer lens 5, and is emitted to the front of the lamp, thereby alerting the driver of the vehicle behind. Further, when intense sunlight b ₁ is irradiated from the front of the vehicle lamp 1 toward the inner lens 4 at sunrise and sunset, the sunlight b ₁ is sequentially reflected by the reflective surfaces 9b and 9a, and the broken line The light enters the vehicle lamp 1 along the route shown in FIG. However, this incident light b ₁ is reflected by the paraboloid of revolution reflector 2 inside the lamp 1, passes through the inner lens 4, and enters the lamp 1; Most of the reflected light does not become parallel to the optical axis and is scattered within the lamp 1, so that it does not become a light beam directed toward the driver of the following vehicle. Similarly, sunlight b ₂ that enters from slightly obliquely above is reflected sequentially from the reflecting surfaces 9b and 9a and enters the lamp 1 as shown by the dashed line. Even if reflected by the parabolic reflector 2, most of the light is not parallel to the optical axis and is confused within the lamp 1, so that false lighting will not occur. Also, even if there is sunlight b ₃ ,
In the upper part of the inner lens 4, as shown in FIG. 3A, the light is not reflected by the reflecting surface 9a or 9b and directly enters the lamp 1, but in this case as well, it is scattered within the lamp 1. Moreover, in the lower part of the inner lens 4, as shown in FIG. 3B, there is no reflective surface 9.
Since the light beam is reflected by the beam a and directed upward, it does not reach the eyes of the driver of the following vehicle.

Note that since FIGS. 3A and 3B are longitudinal cross-sectional views of the inner lens 4, the reflection prism 7b on which the light ray a is reflected for the second time is located above or below the reflection prism 7a on which the light ray a is reflected for the first time. However, in reality, the reflection prism 7b where the second reflection is performed is located outside the reflection prism 7a where the first reflection is performed.

(d Fisheye Lens Step) "FIG. 4" The fisheye lens steps 6, 6, . . . formed in the light source vicinity portion 4a of the inner lens 3 function as follows.

In other words, when the light source bulb 3 is turned on, a ray of light c that is directly or indirectly (reflected light by the reflector 2) incident on the portion 4a of the inner lens 4 near the light source passes through the fisheye lens steps 6, 6, ... and is diffused in all directions as it is emitted forward.

The light rays c diffused by the fisheye lens steps 6, 6, . . . ) as well as the peripheral part 5b of the outer lens 5 (the reflective prism 7 of the inner lens 4,
7, the part corresponding to the peripheral part 4b where... is formed)
It will also be incident on the

(e) Outer Lens [Fig. 1] The outer lens 5 has a diffusion lens step 11, 12 on its back surface, i.e., the surface on the inner lens 4 side.
The light beam passing through the reflecting prisms 7, 7, ... of the inner lens 4 and the fisheye lens steps 6, 6, ... is incident on the light beam and is diffused and emitted forward of the lamp 1.

(f. Formation of reflective surfaces of reflective prisms) [Figure 5] Vapor-deposited films are applied and formed on the reflective surfaces 9, 9, ... of the reflective prisms 7, 7, ... of the inner lens 4 in the following manner. .

That is, the vapor deposition source 1 is placed at a position appropriately spaced from the inner lens 4 above the central axis of the inner lens 4.
2 and directing the vapor deposition source 12 toward the reflective prisms 7, 7, . . . of the inner lens 4, the reflective surfaces 9, .
9. The vapor deposited film will be attached to...

At this time, since each of the reflecting surfaces 9, 9, ... is formed in a concentric circle, each part of the reflecting surface 9 has the same distance from the evaporation source 12, so that the film thickness is uniform throughout. This results in the formation of a vapor-deposited film.

(G. Effect of the invention) As is clear from the above description, the vehicle lamp of the present invention includes a reflecting mirror, a light source disposed within the reflecting mirror, and a lens that covers the front opening of the reflecting mirror. , a diffusing lens element is formed on the front or back surface of the lens near the light source, and a reflecting prism is formed concentrically on the front or back surface of the peripheral area of the lens, and the central axis of the lens of the reflecting prism is formed on the front or back surface of the lens. It is characterized by having a reflective film applied by vapor deposition on the reflective surface facing towards.

Therefore, according to the vehicle lamp of the present invention, since the reflective prism is formed on the lens surface, it is possible to prevent so-called false lighting, and since the reflective prism is formed concentrically, the vapor deposition source is placed at the center of the lens. If placed at an appropriate distance from the lens on the axis, the deposition film can be easily applied to the reflective surface of the reflective prism, and the thickness of the deposited film can be made uniform over the entire reflective surface of the reflective prism. In addition, since a diffusing lens element was formed near the light source on the lens surface, concentric reflecting prisms were formed, which created a ring-shaped pattern when the lamp was viewed from the front. This makes it possible to obtain a substantially uniform brightness state on the lens surface.

[Brief explanation of the drawing]

The drawings show an example of the implementation of the vehicle lamp of the present invention, in which Fig. 1 is a longitudinal sectional view, Fig. 2 is a perspective view of the inner lens, and Fig. 3A is an enlarged view taken along line a-a of Fig. 2. Cross-sectional view, Figure 3B is taken along b-b in Figure 2.
FIG. 4 is an enlarged sectional view taken along the line - in FIG. 2, and FIG. 5 is an explanatory diagram showing the direction in which the reflective surface of the reflective prism is formed. Explanation of symbols, 1... Vehicle lamp, 2... Reflector, 3... Light source, 4... Lens, 4a... Portion near the light source of the lens, 4b... Periphery of the lens, -
... Central axis of the lens, 6 ... Diffusion lens element, 7
...Reflection prism, 9...Reflection surface.

Claims (1)

[Claims for Utility Model Registration] A reflector, a light source disposed within the reflector, and a lens covering the front opening of the reflector, and a diffuser lens element provided on the front or back surface of the lens near the light source. In addition, a reflective prism is formed concentrically on the front or back surface of the peripheral part of the lens, and a reflective film is applied by vapor deposition to the reflective surface of the reflective prism facing toward the central axis of the lens. Vehicle lighting equipment featuring: