JPH07114811A - Signal lighting fixture for vehicle - Google Patents

Abstract

PURPOSE:To produce a stereoscopic feeling, and improve product value by arranging a solid-shaped light distribution control lens on the light source side, and arranging a Fresnel lens having a single focal distance in the radiating direction. CONSTITUTION:Light emitted from a light source 2 is reflected by a reflecting mirror 3, and proceeds in the radiating direction as parallel beams of light, and passes through a light distribution control lens 4. At this time, the parallel beams of light are diffused by a fisheye lens cut 4a applied to the lens 4, and a light distribution characteristic as a signal lighting fixture 1 for a vehicle is set. The parallel beams of light properly diffused after passing through the lens 4 pass through a Fresnel lens 5, and refraction as a convex lens is performed, and they are converged as a whole. Here, since diffusion by the cut 4a is performed, the light distribution characteristic as the lighting fixture 1 is fulfilled without converging a focus. Thereby, when the lighting fixture 1 is viewed from the radiating direction side, the lens 4 is magnified, and is observed and viewed as a virtual image by seeing through of the lens 5. Then, since a recess and projection arranged on the lens 4 are magnified, a stereoscopic feeling is further emphasized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicular lamp, and more particularly to a structure of a signal lamp such as a tail lamp.

[0002]

2. Description of the Related Art FIG. 8 shows an example of the structure of a conventional vehicular signal lamp 90 of this type. First, the vehicular signal lamp 90 has a rotary light source such as an incandescent lamp as a focal point. A reflecting mirror 92 for the object surface is provided, the light from the light source 91 is converged as parallel rays in the irradiation direction, and a lens 93 having a fisheye lens cut 93a is arranged in the optical path of the parallel rays. The fisheye lens cut 93a gives appropriate diffusion to the parallel light rays to obtain light distribution characteristics.

[0003]

However, in the above-described conventional vehicular signal lamp 90, since the lens 93 located closest to the viewer side diffuses light to obtain the light distribution characteristic, the lighting is performed. At times, the surface of the lens 93 becomes bright, the display becomes poor in stereoscopic effect, and the degree of freedom in design is restricted. Further, even in the non-lighted state, the fish-eye lens cut 93a causes the lens 93 to lose the see-through property, resulting in a flat impression of the vehicle signal lamp 90 as a whole, and a solution to these problems becomes a problem. Was there.

[0004]

The present invention is, as a specific means for solving the above-mentioned conventional problems, a reflecting mirror that reflects light from a light source in the irradiation direction as substantially parallel rays, and a reflecting mirror of the reflecting mirror. In a vehicular signal lamp including a lens provided to generate a light distribution characteristic in a reflected light beam, the lens is a three-dimensional light distribution control lens provided on the light source side and a single focus provided on the irradiation direction side. It is an object of the present invention to solve the problem by providing a vehicular signal lamp including a Fresnel lens having a distance.

[0005]

EXAMPLES The present invention will now be described in detail based on the examples shown in the drawings. 1 and 2 shows a first embodiment of a vehicular signal lamp according to the present invention. The vehicular signal lamp 1 includes a light source 2 such as an incandescent light bulb.
And a reflecting mirror 3 of a paraboloid of revolution having the light source 2 as a focal point, which is to generate parallel rays in the irradiation direction, which is the same as in the conventional example.

Here, in the present invention, two lenses, a light distribution control lens 4 and a Fresnel lens 5, are provided in the optical path of the parallel light beam, and the light distribution control lens 4 is closer to the light source 2. Position, that is, provided on the inner surface of the vehicular signal lamp 1, and the Fresnel lens 5 is provided at a position on the irradiation direction side, that is, the outer surface so as to allow direct viewing from the outside.

At this time, the light distribution control lens 4 is formed into an appropriate three-dimensional shape such as a conical concave surface having a flat bottom or a pyramidal concave surface having a flat bottom, and the entire surface is provided with, for example, a fisheye lens cut 4a. It is supposed that the parallel rays from the reflecting mirror 3 are appropriately diffused. The light distribution control lens 4 may be formed as a flat surface when the vehicle signal lamp 1 does not require such a three-dimensional effect.

The Fresnel lens 5 is formed as a convex lens, and therefore the Fresnel lens 5
Will be provided with a concentric Fresnel cut 5a.
At this time, the position of the focal point F of the Fresnel lens 5 can be freely set, but if it is made to coincide with the position of the light source 2, another action and effect can be obtained. This point will be described later. .

Next, the operation and effect of the vehicular signal lamp 1 of the present invention having the above-mentioned structure will be described. FIG. 3 shows the operation of the vehicular signal lamp 1. The light emitted from the light source 2 is reflected by the reflecting mirror 3 and travels in the irradiation direction as parallel rays, and first passes through the light distribution control lens 4. Become.

During transmission of this light distribution control lens 4,
The parallel rays are appropriately diffused by the fisheye lens cut 4a provided on the light distribution control lens 4, and the light distribution characteristics of the vehicular signal lamp 1 are set. In the vehicle signal lamp 1 of the present invention, the Fresnel lens 5 to be described later after passing through the light distribution control lens 4.
Since the refraction is caused by, the reflecting mirror 3 and the fish-eye lens cut 4a are supposed to converge and diffuse in consideration of that point.

The parallel rays, which have been appropriately diffused after passing through the light distribution control lens 4, pass through the Fresnel lens 5 and are refracted as a convex lens to be converged as a whole. By this time, fisheye lens cut 4
Since the light is diffused by a, the light is not clearly focused, and the light distribution characteristics of the vehicular signal lamp 1 are satisfied.

At this time, when the vehicular signal lamp 1 is viewed from the irradiation direction side, the Fresnel lens 5 has a characteristic of a convex lens.
The light distribution control lens 4 is magnified and viewed as indicated by a virtual image G in the figure. Therefore, the unevenness or the like provided in the light distribution control lens 4 for generating a stereoscopic effect is enlarged, and the stereoscopic effect is further enhanced.

Here, the operation and effect in the case where the focal point F of the Fresnel lens 5 is substantially aligned with the position of the light source 2 will be described. All the light transmitted through the light distribution control lens 4 is reflected. Naturally, the direct light D from the light source 2 is also included instead of the parallel light rays reflected by the mirror 3. However, since this direct light D is divergent light with the light source 2 as the center, it is normally distributed. It is disabled without participating in the formation of the optical properties.

Therefore, by making the focal point F of the Fresnel lens 5 substantially coincide with the light source 2, the direct light D is converged into parallel rays, and the light distribution control lens 4 appropriately diffuses it in advance. Since it is performed, the direct light D can also be used to form the light distribution characteristic, and therefore, the reflected light from the reflecting mirror 3 is added to further increase the light amount of the vehicular signal lamp 1. It is possible to increase.

FIG. 4 shows a second embodiment of the present invention, in which the Fresnel lens 5 was used as the outer shell of the vehicular signal lamp 1 in the previous embodiment. It may be covered with the outer lens 6 that does not exert any action. In this case, the shape of the outer lens 6 is made to conform to the design of the vehicle body, and the appearance when not lit can be improved.

Also, by covering the Fresnel lens 5 with the outer lens 6, it is possible to prevent dust from adhering to the Fresnel lens 5. Therefore, the concentric Fresnel cuts 5a to be applied to the Fresnel lens 5 can be formed on either the front or back surface. However, since it is good, it becomes possible to make a selection in consideration of the appearance of the light distribution control lens 4 at the time of lighting, and the degree of freedom is increased.

FIG. 5 shows a third embodiment of the present invention. In this embodiment, an outer lens 6 is provided as in the previous embodiment, and the Fresnel lens 5 has concentric Fresnel cuts 5a on both sides. It is supposed to be given. By doing so, the Fresnel lens 5 becomes equivalent to a biconvex convex lens, and thus can be formed as a lens having a shorter focus.

FIG. 6 shows a fourth embodiment of the present invention. In this embodiment, two Fresnel lenses 5 are used, and the concentric Fresnel cuts 5a face each Fresnel lens 5. It is supposed to be applied to the surface on the side to be done. By doing so, the two Fresnel lenses 5 are equivalent to a combination of plano-convex lenses having convex surfaces facing each other, and it becomes possible to reduce spherical aberration and the like, so that the virtual image G of the light distribution control lens 4 ( (See FIG. 3) can be viewed clearly without distortion such as curvature of field. In this case, since the concentric Fresnel cut 5a is not exposed to the outside, the outer lens 6 is not always necessary.

FIG. 7 shows a fifth embodiment of the present invention. In this embodiment, the Fresnel lens 8 is provided with a linear Fresnel cut 8a in the horizontal direction. The lens 8 is supposed to function as a cylindrical lens that expands only in one direction (vertical direction).

Therefore, the light distribution control lens 7 has a three-dimensional shape only in the direction in which the enlargement is performed (vertical direction), and has a constant cross-sectional shape in the vertical direction as shown in the figure. There is. In addition, especially linear Fresnel cut 8
The light distribution control lens 4 of the first embodiment (see FIG. 1) may be used when the maximum effect of a is not desired. Although not shown, the linear Fresnel cut 8a may be vertical, and in this case, the light distribution control lens 7 may be changed in shape accordingly.

[0021]

As described above, according to the present invention, a lens is provided on the light source side and has a three-dimensional distribution control lens, and a Fresnel lens provided on the irradiation direction side and having a single focal length. As a vehicle signal lamp that has a substantially transparent Fresnel lens is a convex lens is arranged on the irradiation direction side, the three-dimensional light distribution control lens is viewed through the Fresnel lens, Moreover, when this viewing is performed, the magnification by the Fresnel lens is given, and at the time of lighting, a three-dimensional effect such as depth that could not be obtained in the past is produced, and an extremely excellent effect of improving the commercial property is obtained. It plays.

Further, by making the position of the focal point of the Fresnel lens substantially the position of the light source, the direct light from the light source, which was conventionally ineffective in forming the light distribution characteristic, is also converted into a substantially parallel light beam. The irradiation angle range is converged to the above range, and thereby, the effect that the increase in the light amount of the vehicular signal lamp can be expected can be obtained.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first embodiment of a vehicular signal lamp according to the present invention in a partially exploded state.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is an explanatory diagram showing an operation of the same first embodiment.

FIG. 4 is a sectional view showing a main part of a second embodiment of the vehicular signal lamp according to the present invention.

FIG. 5 is a sectional view showing an essential part of a third embodiment of the vehicular signal lamp according to the present invention.

FIG. 6 is a sectional view showing a main part of a fourth embodiment of the vehicular signal lamp according to the present invention.

FIG. 7 is a perspective view showing a fifth embodiment of the vehicular signal lamp according to the present invention.

FIG. 8 is a sectional view showing a conventional example.

[Explanation of symbols]

 1 ... Vehicle signal lamp 2 ... Light source 3 ... Reflecting mirror 4,7 ... Light distribution control lens 4a ... Fish-eye lens cut 5,8 ... Fresnel lens 5a ... Concentric Fresnel cut 8a ... Linear Fresnel cut 6 …… Outer lens D …… Direct light from light source F …… Fresnel lens focus G …… Virtual image

Claims (3)

[Claims] 1. A vehicular signal lamp comprising a reflecting mirror that reflects light from a light source as substantially parallel rays in an irradiation direction, and a lens provided to generate a light distribution characteristic in the reflected rays of the reflecting mirror. The signal lamp for a vehicle, wherein the lens is composed of a light distribution control lens provided on the light source side and having a three-dimensional shape, and a Fresnel lens provided on the irradiation direction side and having a single focal length. 2. The Fresnel lens has a concentric Fresnel cut in which the focal point converges to one point or a linear Fresnel cut in which the focal point converges linearly, and the light distribution control lens has a shape corresponding to the cut of the Fresnel lens. The vehicular signal lamp according to claim 1, wherein 3. The vehicular signal lamp according to claim 1, wherein the position of the focal point of the Fresnel lens substantially coincides with the position of the light source.