JPH0375962B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The vehicle lamp lens of the present invention will be explained in accordance with the following items.

A. Field of industrial application B. Outline of the invention C. Prior art [Figure 6] D. Problems to be solved by the invention [Figure 7] E. Means for solving the problems F. Example a. Lens for vehicle lamps [ 1 to 4] b. Rear signal light for automobile [FIG. 5] G. Effects of the invention (A. Field of industrial application) The present invention relates to a novel lens for a vehicle lamp. Specifically, a lens for a vehicle lamp in which a number of protrusions having a triangular cross-sectional shape are formed on one surface of the lens, one surface of the protrusions is a reflective surface, and the other surface is a transmissive surface. It is an object of the present invention to provide a novel lens for a vehicle lamp, which has a reflective surface having good durability and good light distribution performance.

(B. Summary of the Invention) The lens for a vehicle lamp of the present invention has a number of protrusions having a triangular cross section formed on one surface of the lens, one surface of the protrusions serves as a reflective surface, and the other surface serves as a reflective surface. A lens for a vehicle lamp whose surface is a transparent surface, and a transparent protective film is formed only on the reflective surface of the protrusion, and the reflective surface is protected by the transparent protective film. Therefore, the durability is good, and since no transparent protective film is formed on the parts other than the reflective surface, the light distribution performance is good without reducing the transmittance or disturbing the light control direction.

(C Prior Art) [Fig. 6] Some lenses for vehicle lamps have a large number of protrusions formed on the lens surface, and some of the protrusions serve as reflective surfaces.

FIG. 6 shows an example of such a lens for a vehicle lamp.

A is a lens for a vehicle lamp, and a large number of annular protrusions b, b, . . . are formed concentrically on the front surface of the lens. These protrusions b, b, ... have a triangular cross-sectional shape, and one of the two surfaces forming the protrusions b, b, ... is a reflective surface, The other surfaces d, d, . . . are transparent surfaces.
Incidentally, the reflective surfaces c, c, . . . are formed, for example, by vacuum evaporation of aluminum.

A large number of condensing lens elements e, e, . . . each having a substantially semicircular cross-sectional shape are formed concentrically on the back surface of the lens a. These condensing lens elements e, e,
... are protrusions b, b, ... formed on the front surface of lens a.
It is formed at a position corresponding to

Therefore, from the rear surface of this lens a, the optical axis x-x
Light f parallel to (axis perpendicular to the reference plane of lens a),
When f,... are incident, the lights f, f,... are focused by the condensing lens elements e, e,... onto the inner surfaces of the reflective surfaces c, c,... of the protrusions b, b,..., The light is reflected by the reflective surfaces c, c, . . . , passes through the transmitting surfaces d, d, . Then, the light is reflected by the outer surfaces of the reflecting surfaces c, c, . . . and irradiated forward.

(D Problem to be Solved by the Invention) [Fig. 7] However, the reflective surfaces c, c, ... of the lens 1 for a vehicle lamp described above react with moisture and air in the lamp in which this lens 1 is used. However, there is a problem in that the reflective film deteriorates during long-term use, reducing reflection efficiency and impairing the light distribution function.

Therefore, it is conceivable to cover the front surface of the lens a with a transparent protective film g. In this way, the reflective surfaces c, c, . . . are isolated from moisture and air within the lamp, so that deterioration in the performance of the reflective surfaces c, c, . . . is almost suppressed.

However, the transparent protective film g has transparent surfaces d, d,
..., the transmittance at the transmission surfaces d, d, ... decreases, and the amount of light transmitted through the entire lens a decreases.

In addition, if the surface to which the paint is applied is uneven, as in this lens a for a vehicle lamp, the adjacent protrusions b,
A paint reservoir h is formed deep in the recess formed between the reflective surface c and the transmitting surface d of b, and the thickness of the transparent protective film g changes at this portion h, causing a lens effect. In addition, the light deviates from the planned optical path in this portion h, and therefore the planned light distribution performance cannot be achieved. Further, since the shape and film thickness of such a paint reservoir h are non-uniform and cannot be calculated in advance, it is difficult to design a lens keeping in mind the occurrence of such a portion h.

(E. Means for Solving the Problems) In order to solve the above-mentioned problems, the vehicle lamp lens of the present invention has a large number of protrusions each having a triangular cross-sectional shape formed on one surface of the lens. A lens for a vehicle lamp in which one surface of the protrusion is a reflective surface and the other surface is a transmissive surface, wherein a transparent protective film is formed only on the portion of the protrusion that is the reflective surface. It is something.

Therefore, in the vehicle lamp lens of the present invention,
Since the reflective surface of the protrusion is covered with a transparent protective film, this reflective surface does not come into contact with the moisture or air in the lamp during use, which may deteriorate the reflective surface and reduce light distribution performance. Never. Further, since the transparent protective film is formed only on the part where the reflective surface is formed and not on other parts, the transparent protective film does not interfere with the transmission efficiency or control function of the parts other than the reflective surface.

(F. Example) The details of the vehicle lamp lens of the present invention will be described below with reference to illustrated examples.

(a Lens for Vehicle Light) [FIGS. 1 to 4] Reference numeral 1 in the figure is a lens for vehicle light, and a circular mounting hole 2 is formed in the center thereof.

A large number of concentric protrusions 3, 3, . . . each having a triangular cross-sectional shape are formed on the front surface of the lens 1.
And the two surfaces 3a of these protrusions 3, 3,...
Among 3a, 3b, 3b, . . . , the surfaces 3a, 3a, . There is.

The reflective surfaces 3a, 3a, . . . are formed, for example, by applying a vacuum-deposited film of aluminum.

4, 4, ... are transparent protective films, and protrusions 3, 3,
It is formed only on the reflective surfaces 3a, 3a, . The transparent protective films 4, 4, . . . are formed by, for example, applying a transparent synthetic resin paint onto the reflective surfaces 3a, 3a, . In addition, the transparent material is used as the reflective surface 3a, 3
The transparent protective films 4, 4, . . . can also be formed by vacuum deposition on a, . In these cases, the air gun, evaporation source, and lens 1 may be arranged in a positional relationship such that the transmitting surfaces 3b, 3b, .

On the rear surface of the inner lens 1, there is a protrusion 3 on the front surface.
A large number of protruding condensing lens elements 5, 5, . . . each having a semicircular cross-sectional shape are formed concentrically at locations corresponding to 3, .

A retroreflector 6 is attached to an attachment hole 2 formed in the center of the lens 1.

(b Automobile Rear Signal Light) [Fig. 5] Next, an example of a vehicle lamp in which the vehicle lamp lens 1 according to the present invention described above is used will be described. 7
is a rear signal light for an automobile in which the lens 1 described above is used.

A lamp body 8 is open at the front and closed at the rear, and a socket 9 is detachably attached to the center of the rear part, and a light bulb 10 is detachably supported in the socket 9.

A reflecting mirror 11 is disposed within the lamp body 8 and has a reflecting surface 11a shaped like a paraboloid of revolution. The light bulb 10 is inserted into the inside of the reflecting mirror 11 through an insertion hole formed at the center of the rear part of the reflecting mirror 11, and the filament 10a thereof is positioned at approximately the focal point of the reflecting surface 11a.

The lens 1 is attached to the lamp body 8 so as to cover the front opening thereof.

Reference numeral 12 denotes an outer lens attached to the lamp body 8 so as to cover the front surface of the lens 1.

In the automobile rear signal light 7 as described above, light is emitted from the filament 10a of the light bulb 10 and reflected from the reflector 1.
Light 13, 13,... reflected by the reflective surface 11a of 1
becomes a light beam parallel to the optical axis xx of the reflecting mirror 11.
Then, the light enters the rear surface of the lens 1 and is condensed by the condenser lens elements 5, 5, .
Head towards a, 3a,...

The light 13, 13, ... is reflected by the reflecting surface 3a,
It is reflected by the inner surface of 3a,... and the protrusions 3, 3,...
The light passes through the other surface, that is, the transparent surface 3b, 3b, ... and is directed toward the reflective surface 3a, 3a, ... of the protrusion 3, 3, ... which is one outer side of the protrusion 3, 3, .... , are reflected by the outer surfaces of the reflective surfaces 3a, 3a, . .

(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 protrusions having a triangular cross-sectional shape formed on one surface of the lens,
A lens for a vehicle lamp, in which one surface of the protrusion is a reflective surface and the other surface is a transparent surface,
The present invention is characterized in that a transparent protective film is formed only on a portion of the protrusion that serves as a reflective surface.

Therefore, in the vehicle lamp lens of the present invention,
Since the reflective surface of the protrusion is covered with a transparent protective film, this reflective surface does not come into contact with the moisture or air in the lamp during use, which may deteriorate the reflective surface and reduce light distribution performance. Never. Further, since the transparent protective film is formed only on the part where the reflective surface is formed and not on other parts, the transparent protective film does not interfere with the transmission efficiency or control function of the parts other than the reflective surface.

Therefore, in the vehicle lamp lens of the present invention, the durability of the reflective surface is good, and the light distribution performance is also good.

[Brief explanation of drawings]

1 to 4 show an example of the implementation of the lens for a vehicle lamp according to the present invention. FIG. 1 is a front view, FIG. 2 is a vertical sectional view, FIG. 3 is a rear view, and FIG. 4 is a main part. FIG. 5 is a vertical cross-sectional view showing an example of a vehicle light using the vehicle light lens of the present invention, FIG. 6 is a vertical cross-sectional view showing an example of a conventional vehicle light lens, and FIG. It is an enlarged sectional view showing a problem. Explanation of symbols, 1... Lens for vehicle lamp, 3...
Projection, 3a... Reflective surface, 3b... Transmissive surface, 4...
Transparent protective film.

Claims (1)

[Claims] 1. A number of protrusions having a triangular cross-sectional shape are formed on one surface of the lens, one surface of the protrusions is used as a reflective surface, and the other surface is used as a transmitting surface. 1. A lens for a vehicle light, characterized in that a transparent protective film is formed only on a portion of the protrusion that is a reflective surface.