JPH1125715A - Signal lights for vehicles - Google Patents

Abstract

(57) [Problem] In a conventional vehicle signal lamp of this type, the shape of an outer lens having a fish-eye lens cut is recognized at the time of lighting, so that the outer shape becomes flat and the degree of freedom in design is improved. The problem is that the degree of attention cannot be increased. According to the present invention, a reflecting mirror reflects light from a light source as substantially parallel light, an inner lens is in an optical path from the reflecting mirror, at least a part of which is a convex lens portion and a concave lens. The vehicle signal lamp 1 is configured as a Fresnel hologram 6 configured as a part 41b, a flat plate part 41c, or a lens group 41 in which these are mixed, and a part of the outer lens 5 is configured as a Fresnel hologram 6 having a substantially focal point on the light source 2.
As a result, the function is satisfied by the reflecting mirror 3 and the inner lens 4, and the Fresnel hologram 6 and the inner lens 4 generate an optical image G1 at any position in the depth direction, thereby turning on the vehicle signal light 1. Give the sign of time a three-dimensional effect and solve the problem.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal lamp, such as a tail lamp, for notifying the situation of a vehicle to the outside. , To further improve the notification effect.

[0002]

2. Description of the Related Art FIG. 5 shows an example of the configuration of a conventional vehicular signal lamp 90. A light source 91 such as an incandescent light bulb, an inner lens 92 which is a colorless Fresnel lens, and a red An outer lens 93 is formed by combining a plurality of convex lenses 93a having a relatively short focal length, which are formed in a signal lamp color and are called a fisheye lens, etc., in a planar manner. If necessary, the outer lens 93 may be covered with a cover lens or the like in order to match the vehicle body design.

[0003] The inner lens 92 is positioned at the focal point of the light source 91 and makes the light from the light source 91 incident on the outer lens 93 as substantially parallel rays. The outer lens 93 gives an appropriate divergence angle to the parallel rays, and the divergence angle allows the lighting of the vehicular signal lamp 90 to be confirmed from a wide range, that is, forms a light distribution characteristic and radiates light to the outside. Is what you do.

When the light source 91 is turned on in the vehicular signal lamp 90 having the above-described configuration, it looks as if each of the convex lenses 93a emits light. Even if the individual size, focal length, and the like of the convex lens 93a are changed within a range that satisfies the above-described light distribution characteristics, such a change occurs in the appearance. Absent.

[0005]

However, in the vehicle signal lamp 90 having the above-mentioned conventional structure, when the lighting is not performed, such as in the daytime, the design feature can be obtained by the cover lens and the like. However, when the lamp is lit at night or the like, as described above, the outer lens 93 can be recognized only in the shape of the flat plate, and it is difficult to express individuality such as a vehicle type compared to the daytime. The problem is that it is mediocre in terms of attention and low in attention.

[0006]

The present invention, as a specific means for solving the above-mentioned conventional problems, comprises a light source, a reflecting mirror, an inner lens, and an outer lens, and the reflecting mirror is provided from the light source. Is reflected in the irradiation direction as substantially parallel light, the inner lens is in the optical path from the reflecting mirror, at least a portion of which is a convex lens portion, a concave lens portion, a flat plate portion, or a lens group in which they are mixed. And at least a part of the outer lens,
By providing a signal light for a vehicle, which is configured as a hologram optical element having a lens function of enlarging the inner lens and having a substantially focal point on the light source, it gives a three-dimensional effect to the sign at the time of lighting. To solve the problem.

[0007]

Next, the present invention will be described in detail based on an embodiment shown in the drawings. FIG. 1 shows a signal light 1 for a vehicle according to the present invention (hereinafter abbreviated as a signal light 1) in a main part, and a reference numeral 2 in the figure denotes a light source such as an incandescent light bulb. What is indicated by 3 is a reflecting mirror,
Reference numeral 4 denotes an inner lens, and reference numeral 5 denotes an outer lens.

At this time, the reflecting mirror 3 is formed as a paraboloid of revolution having a focus on the light source 2, and reflects the light from the light source 2 as substantially parallel light in the irradiation direction. Then, the inner lens 4 is placed in the parallel light from the reflecting mirror 3. At this time, the inner lens 4 is preferably provided with a lens group 41 according to the present invention, which will be described in detail below, at a central portion, and a fisheye lens 42 similar to the conventional example is provided at other portions. .

At this time, the first function of the lens group 41 is to provide appropriate diffusion to the parallel light incident from the reflecting mirror 3 as in the case of the fisheye lens 42 provided in the other portions, for example, a tail lamp or the like. The light distribution characteristics of the signal lamp 1 are formed. Therefore, the lens group 41
Is formed so as to be suitable for the formation of the light distribution characteristics described above, and is also formed so as to be suitable for a second function by the outer lens 5 described later.

As described above, the light source 2, the reflecting mirror 3, and the lens group 4
As described above, the configuration and operation of the inner lens 4 having the light source 2, the reflecting mirror 3, and the inner lens 4 are basically the same as those of the conventional signal lamp. In addition, an outer lens 5 is provided.

At this time, the outer lens 5 is provided with a hologram optical element having a lens function, for example, a Fresnel hologram 6 at least in part.
In the present invention, the position of the focal point of the Fresnel hologram 6 substantially coincides with the position of the light source 2. Further, in the present invention, the outer lens 5 itself is a transparent one.

Here, when the Fresnel hologram 6 is provided on the outer lens 5, a fine ruggedness is provided by embossing a film-like member having interference fringes recorded on a photosensitive material or a transparent resin film. May be formed separately from the Fresnel hologram 6 formed of a film-like member having the shape and the outer lens 5 formed in a transparent shape by a mold or the like, and the two may be integrated by bonding or the like.

In recent years, resin molding technology has advanced remarkably and advanced molding is possible. Therefore, a metal mold for forming the outer lens 5 is provided with fine irregularities corresponding to the Fresnel hologram 6 to form an outer lens. The lens 5 may be formed integrally during injection molding when forming the lens 5.

Next, the operation and effect of the above configuration will be described. If it is assumed that the inner lens 4 does not exist, the Fresnel hologram 6 provided on the surface of the outer lens 5 has the focal point coincident with the light source 2 as described above. Is incident as parallel light, and does not form an optical image near the signal lamp 1.

However, in reality, as shown in FIG. 2, between the light source 2 and the Fresnel hologram 6, for example, there is a lens group 41 each having a convex lens portion 41a. f converges once and fake light source M
Then, while diverging, the Fresnel hologram 6
Will be incident on.

As a result, a light image G1 is generated at a position different from the position where the inner lens 4 exists by the first-order diffracted light without impairing the light amount of the pseudo light source M. At this time, the light image Gn of the Fresnel hologram 6 due to higher-order diffracted light such as secondary and tertiary light also has low brightness but is generated at the same time.

At this time, the state in which the inner lens 4 is shining in a planar shape by the parallel light from the reflecting mirror 3 is enlarged by the Fresnel hologram 6 and appears to advance slightly, but the inner lens 4 is originally installed. Because it is viewed at a position that does not differ so much from the position that was done,
The viewer can see the inner lens 4, the light image G1, and the light image Gn at the same time, and a three-dimensional effect can be obtained on the light emitting surface of the signal lamp 1.

Here, the preferred conditions for obtaining the above-described three-dimensional effect will be described. The focal point f of the convex lens portion 41a forming the lens group 41 is
, That is, between the light source 2 and the Fresnel hologram 6 (or the outer lens 5).

This is because if the focal length is outside the range, the light image of the pseudo light source M appears as a real image on the front side of the Fresnel hologram 6 and the three-dimensional effect is impaired. However, when another effect due to the real image appearing on the near side is expected, the focal point f is not limited to this, and the focal point f can be set outside the focal length of the Fresnel hologram 6.

As is clear from the above description, the position where the light image G1 is generated is determined by the focal point f of the convex lens portion 41a (or the concave lens portion 41b which will be described later), that is, the position where the pseudo light source M is generated. It will be. Therefore, by combining lenses having different focal lengths in the lens group 41, a three-dimensional effect can be generated between the optical images G1.

FIG. 3 shows another embodiment of the present invention. In the previous embodiment, the lens group 41 includes the convex lens portion 4.
1a, but the present invention is not limited to this, and the concave lens portion 4
1b may be freely formed, and furthermore, though not shown, it may be freely formed by mixing the convex lens portion 41a and the concave lens portion 41b.

Here, when the concave lens portion 41b is formed, the position of the focal point f (pseudo light source M) is generated on the outer lens 5 side in the convex lens portion 41a, but is generated on the light source 2 side in the concave lens portion 41b. Becomes Therefore, when the signal lamp 1 having the same appearance is formed with the same distance L from the Fresnel hologram 6 to the focal point f, the distance between the Fresnel hologram 6 and the inner lens 4 when the convex lens portion 41a is adopted is (L + f). On the other hand, (L-f) is obtained in the concave lens portion 41b, and the signal lamp 1 can be made thinner.

FIG. 4 shows still another embodiment of the present invention. In the previous embodiment, the lens group 41 is composed of only the convex lens portion 41a and the concave lens portion 41b, each having only a focal point. However, in this embodiment, the convex lens portion 41a having a focal point (or the concave lens portion 41b)
The lens group 41 is composed of, for example, a flat plate portion 41c having a uniform thickness on the entire surface and having no focal point.

By doing so, the pseudo light source M does not occur in the portion formed as the flat plate portion 41c.
Therefore, the light image G1 by the pseudo light source M does not occur. This means that the presence or absence of the light image G1 can be controlled by the configuration of the lens group 41 provided on the inner lens 4.

Therefore, for example, when the lens group 41 has a vertical and horizontal matrix arrangement, if the convex lens portion 41a or the concave lens portion 41b is arranged in a character shape, a figure shape, or the like, and the other portion is formed by the flat plate portion 41c, In the lighting state of the signal lamp 1, characters and graphics arranged on the surface of the lens group 41 are indicated by the light image G1.

[0026]

As described above, according to the present invention, a light source, a reflecting mirror, an inner lens, and an outer lens are provided. The reflecting mirror reflects light from the light source as substantially parallel light in the irradiation direction. The inner lens is in the optical path from the reflecting mirror, at least a part of which is a convex lens portion,
It is configured as a concave lens portion, a flat plate portion, or a lens group in which they are mixed, and at least a part of the outer lens is configured as a hologram optical element having a lens function of substantially focusing on the light source and enlarging the inner lens. In addition to satisfying the function as a vehicle signal lamp by the reflecting mirror and the inner lens, the inner lens is arranged in the front-rear direction by the hologram optical element and the inner lens provided on the outer lens. Thus, a light image is generated at a different position, thereby giving a three-dimensional effect to the sign at the time of lighting of the vehicular signal light, thereby achieving an extremely excellent effect of improving the design and the degree of attention.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an essential part of an embodiment of a vehicular signal lamp according to the present invention.

FIG. 2 is an operation explanatory view shown in a cross-sectional direction along the line AA in FIG. 1;

FIG. 3 is a cross-sectional view showing another embodiment of the present invention.

FIG. 4 is a sectional view showing still another embodiment of the present invention.

FIG. 5 is a perspective view showing a main part of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Signal light for vehicles 2 ... Light source 3 ... Mirror 4 ... Inner lens 41 ... Lens group 41a ... Convex lens part 41b ... Concave lens part 41c ... Plate part 42 ... Fisheye lens 5 ... Outer lens 6 Fresnel hologram M Simulated light source G1 Light image by first-order diffraction

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kenichiro Takada 1-1-1, Showa-cho, Kariya, Aichi Prefecture Inside Denso Corporation (72) Inventor Haruo Teraoka 5-33-8 Shiba, Minato-ku, Tokyo Mitsubishi Motors Industries (72) Inventor Toshiyuki Kondo 2-9-13 Nakameguro, Meguro-ku, Tokyo Stanley Electric Co., Ltd.

Claims (5)

[Claims] 1. A light source, a reflecting mirror, an inner lens, and an outer lens, wherein the reflecting mirror reflects light from the light source as substantially parallel light in an irradiation direction, and the inner lens is disposed in an optical path from the reflecting mirror. At least a part thereof is configured as a convex lens portion, a concave lens portion, a flat plate portion, or a lens group in which they are mixed, and at least a portion of the outer lens has a substantially focal point on the light source and has the inner lens. A signal light for a vehicle, wherein the signal light is configured as a hologram optical element having a function of expanding a lens. 2. The focus position of each of the lens groups of the inner lens is located within the focal length of the hologram optical element of the outer lens.
The vehicle signal light according to the above. 3. The hologram optical element according to claim 1, wherein the hologram optical element is a Fresnel hologram.
The vehicle signal light according to the above. 4. The vehicle signal according to claim 1, wherein the Fresnel hologram has a film shape, and is integrated with the outer lens by sticking. Lights. 5. The vehicle according to claim 1, wherein said Fresnel hologram is formed integrally by said outer lens forming means when said outer lens is formed. Signal lights.