JPH03646Y2 - - Google Patents

Description

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

A. Industrial field of application B. Overview of the invention C. Background technology and its problems [Figures 8 and 9] D. Means for solving the problem E. Examples [Figures 1 to 5] F. Modifications [Figures 1 to 5] 6 and 7] G. Effects of the invention (A. Field of industrial application) The present invention relates to a novel lens for vehicle lamps. Specifically, this is a new vehicle lighting device that prevents so-called false lighting, where the lamp appears to be on even though it is not, and also allows the light from the light source to be emitted more efficiently. The aim is to provide lenses.

(B Summary of the invention) The lens for a vehicle lamp of the present invention has a large number of concentric protrusions with triangular cross-sections formed on the front surface, and the apex angle θ at which the two slopes of the protrusions intersect is approximately constant.
A reflective surface is formed on one of the two slopes closer to the center, and the angle φ that the reflective surface makes with the lens surface gradually increases toward the periphery, so that θ≈φ near the center of the lens. Accordingly, most of the light reflected by the reflective surface near the center is incident on the reflective surfaces closer to the periphery, so that the light from the light source is efficiently emitted.

C. Background art and its problems [Figures 8 and 9] False lighting is a big problem for vehicle lights. That is, when strong external light, such as sunlight, enters the lamp, is reflected by the internal reflective surface, and is irradiated to the outside, it looks as if the lamp is lit, and the lamp appears to be a signal light. In such a case, it would appear as though a false signal was being issued to outsiders, resulting in a significant hindrance to traffic safety.

Therefore, in order to prevent such false lighting, a vehicle lamp a as shown in FIG. 7 can be considered.

b is the lamp body, which is box-shaped with an opening at the front, and a reflecting mirror c is installed inside the lamp body;
Further, the front opening is covered by an outer lens d. e is a light bulb supported by reflector c.

f is an inner lens disposed within the lamp body b between the reflecting mirror c and the outer lens d.

On the front surface of the inner lens f, a large number of protrusions g, g, . . . each having a substantially triangular cross-sectional shape are arranged concentrically. Of the two surfaces of the protrusions g, g, . . . , the surface h, h, . . . which is closer to the center is a reflective surface.

Therefore, the light emitted from the bulb e is reflected by the reflector c
The light is reflected by the light beam and enters the rear surface of the inner lens f. Then, those lights are reflected by the reflective surfaces h, h, ... formed on the protrusions g, g, ... and are reflected by the protrusions g, g, ... adjacent to the outside of the protrusions g, g, ... It faces toward the surfaces h, h, ..., is further reflected by the reflecting surfaces h, h, ... and heads toward the outer lens d,
The light passes through the outer lens d and is emitted to the outside.

For example, if there is intense sunlight E from a low position at sunrise or sunset, the light E enters through the outer lens d and is sequentially reflected by the reflective surfaces h, h, ... on the inner lens f. Some light enters the reflecting mirror c, but in the process of entering, the angle of the light shifts slightly, so even if it is reflected by the reflecting mirror c, it does not emerge from the inner lens f. Even if there is light emitted from the lens f, it will be largely deviated from the center and will be diffused, so it is possible to prevent false lighting that would be a nuisance to traffic.

By the way, in the vehicle lamp a described above, if the angles of the reflective surfaces h, h, ... formed on the inner lens f with respect to the surface of the inner lens f are all the same, as shown in FIG. There is a problem in that some of the light reflected by the reflective surface _h1 located closer to the reflective surface h1 does not enter the reflective surface _h2 of the protrusion g adjacent to the outside, resulting in poor utilization efficiency of the luminous flux.

(Means for Solving Problem D) The lens for a vehicle lamp of the present invention has a number of concentric protrusions with triangular cross-sections formed on the front surface, and the apex angle θ where the two slopes of the protrusions intersect is approximately constant. and above 2
A reflective surface is formed on the slope near the center of the two slopes, and the angle φ that the reflective surface makes with the lens surface gradually increases toward the periphery, so that θ≒φ near the center of the lens. It is.

Therefore, according to the vehicle lamp lens of the present invention, the reflective surfaces located closer to the periphery are in a state of being more upright with respect to the lens surface than the reflective surfaces located closer to the center. Almost all of the light reflected by the reflective surface enters the reflective surface on the peripheral side and is reflected forward, so that the light from the light source can be efficiently emitted.

(Embodiment E) [Figs. 1 to 5] Details of the vehicle lamp lens of the present invention will be explained according to the illustrated embodiment.

In the figure, numeral 1 is an automobile signal lamp using the lens for a vehicle lamp according to the present invention.

Reference numeral 2 denotes a lamp body made of synthetic resin, which has a substantially box-like shape with an open front, and a reflecting mirror 3 is provided inside the lamp body. The reflecting mirror 3 has a reflecting surface 3a forming a part of a paraboloid of revolution.

Reference numeral 4 denotes a light bulb, and its filament 4a is placed at the focal point of the reflecting surface 3a of the reflecting mirror 3. Therefore, the light 5 emitted from the filament 4a of the light bulb 4 and reflected by the reflecting surface 3a of the reflecting mirror 3 becomes a light beam parallel to the axis xx of the reflecting mirror 3.

Reference numeral 6 denotes an outer lens attached to the lamp body 2 so as to cover the front opening thereof, and necessary lens elements are formed on the inner surface of the outer lens.

Reference numeral 7 denotes an inner lens made of transparent synthetic resin, and is disposed within the lamp body 2 between the reflecting mirror 3 and the outer lens 6.

The inner lens 7 has a circular mounting hole 8 formed in its center.

A large number of concentric protrusions 9, 9, . . . each having a triangular cross-sectional shape are formed on the front surface of the inner lens 7. Of the two surfaces 9a, 9a, ... and 9b, 9b, ... of these protrusions 9, 9, ..., the surfaces 9a, 9a, ... facing the center side are made to be reflective surfaces provided with a reflective film, The outward facing surfaces 9b, 9b, . . . are transparent surfaces.

The protrusions 9, 9, . . . are composed of two slopes 9a, 9a, . . . and 9b, 9b, .
The angle θ of the apex angle formed by and is substantially constant for all the protrusions 9, 9, . . . In addition, the reflective surfaces 9a, 9
The angle (hereinafter referred to as the "inclination angle of the reflective surface") made by a, ... with respect to the surface of the inner lens 7 is small at the center and increases toward the periphery. The angle θ and the angle φ are made to be approximately equal. Therefore, the reflective surfaces 9a, 9a, . . . are in a state where those closer to the periphery are more upright than those closer to the center.

The rear surface of the inner lens 7 has a front protrusion 9,
A large number of protruding condensing lens elements 10, 10, . . . each having a semicircular cross-sectional shape are formed concentrically at locations corresponding to 9, .

Reference numeral 11 denotes a retroreflective reflector attached to an attachment hole 8 formed in the center of the inner lens 7.

In the automobile signal light 1 as described above, the light bulb 4
The light beams 5, 5, . Then, the light enters the rear surface of the inner lens 7 and is condensed by the condenser lenses 10, 10, . …
heading to

The above-mentioned lights 5, 5, . . . are reflected by the reflecting surfaces 9a, 9.
a,... is reflected by the inner surface of the protrusions 9, 9,... and passes through the other surface of the protrusions 9, 9,..., that is, the transparent surface 9b, 9b,... and is one step outside of the protrusions 9, 9,... is directed towards the reflective surfaces 9a, 9a, . . . of the protrusions 9, 9, . The light is emitted from the outer lens 6 under the control of the lens element.

In addition, for example, strong external light E from a low position, such as sunlight at sunrise and sunset, can be absorbed by the outer lens 6.
When transmitted, it is refracted by the lens element formed on it, so even if it is reflected by the reflective surfaces 9a, 9a, . . . formed on the inner lens 7 and enters the interior, most of it is reflected by the reflecting mirror The light will not be reflected by the reflective surface 3a and become parallel to the optical axis x-x, thus preventing false lighting.

In the case of the inner lens 7, the angle θ of the apex angle of the protrusions 9, 9, . . . is constant, and the reflective surface 9
Since the inclination angle φ of a, 9a, ... increases toward the periphery, the ray 1 shown by the dotted line in FIG.
As shown in 2, if the inclination angles φ of all the reflecting surfaces were the same, even if the light would not enter the outer reflecting surface 9a and proceed as it is, it would definitely enter the outer reflecting surface 9a. The light is reflected there, passes through the outer lens 6, and is emitted forward.

(F. Modification) [Figs. 6 and 7] Figs. 5 and 6 show a modification of the vehicle lamp lens of the present invention.

Reference numeral 13 denotes an inner lens according to the present invention, which corresponds to the inner lens 7 in the above embodiment.

The inner lens 13 is made of transparent synthetic resin, has a circular mounting hole 14 formed in its center, and has a mortar-like shape with a concave center when viewed from the front, that is, a circular mounting hole 14 is formed in the center. It is formed to have an inclination that is displaced forward as it approaches the peripheral edge.

On the front surface of the inner lens 13, a large number of protrusions 15, 15, . . . each having a triangular cross-sectional shape are formed concentrically. And these protrusions 15, 15,...
The two surfaces 15a, 15a, ... and 15b, 15
The surfaces 15a, 15a, facing toward the center among b,...
The surfaces 15b, 15b, . . . facing outward are the reflective surfaces provided with a reflective film, and the surfaces 15b, 15b, . . . are the transparent surfaces.

The apex angle θ of the protrusions 15, 15, . . . is substantially constant, and the reflecting surfaces 15a, 15a,
The inclination angle φ of ... increases toward the periphery, and the apex angle θ at the center
and the inclination angle φ of the reflecting surface are substantially the same.

By making the protrusion forming surface of the inner lens 13 into a substantially mortar shape as described above, the reflective surface 15
a, 15a, . . . those located on the outside are located closer to the front than those located on the inside, and a situation arises in which the light reflected by the inner reflective surface 15a does not enter the outer reflective surface. This can be more reliably avoided, and the light from the light source can be emitted without waste.

Further, a reflective surface 15 is provided on the inner lens 13.
a, 15a,... by vacuum evaporation, as shown in FIG.
Since all of the surfaces to be the reflective surfaces 15a, 15a, . . . 5, 15, .

(G. Effect of the invention) As is clear from the above description, the lens for a vehicle lamp of the present invention has a large number of concentric protrusions having a triangular cross section formed on the front surface, and the protrusions are Assuming that the apex angle θ where the two slopes intersect is approximately constant, the angle φ that the inner slope of the two slopes makes with the lens surface gradually changes toward the periphery. θ≒φ near the center and θ＜φ at the periphery.
It is characterized by having a reflective surface formed on the inner slope.

Therefore, according to the vehicle lamp lens of the present invention, the reflective surfaces located closer to the periphery are in a state of being more upright with respect to the lens surface than the reflective surfaces located closer to the center. Almost all of the light reflected by the reflective surface enters the reflective surface on the peripheral side and is reflected forward, so that the light from the light source can be efficiently emitted.

[Brief explanation of drawings]

Figures 1 to 5 show an example of the application of the vehicle lamp lens of the present invention to an automobile signal light. Figure 1 is a longitudinal sectional view, Figure 2 is a front view of the lens, and Figure 3 is a front view of the lens. A rear view of the lens, FIG. 4 is an enlarged cross-sectional view of the main part showing the operation, FIG. Fig. 6 is a longitudinal sectional view, Fig. 7 is an enlarged sectional view of main parts showing the operation, Figs. 8 and 9 are comparative examples, Fig. 8 is a longitudinal sectional view, and Fig. 9 is a problem. FIG. 2 is an enlarged sectional view of a main part to show points. Explanation of symbols, 1... Vehicle light, 7... Lens for vehicle light, 9... Projection, 9a, 9b... Two slopes, 9a... Reflective surface, 13... Lens for vehicle light, 15... Projections, 15a, 15b...two slopes, 15a...reflective surface.

Claims (1)

[Claims for Utility Model Registration] Consisting of a number of protrusions with triangular cross-sections formed concentrically on the front surface, with the angle θ of the apex where the two slopes forming the protrusions intersect being approximately constant. Of the two slopes mentioned above, the angle φ that the inner slope makes with the lens surface is gradually increased toward the periphery, so that θ≒φ near the center and θ<φ at the periphery. A vehicle lighting lens characterized by having a reflective surface formed on the inner slope.