JP2955166B2 - Signal lights for vehicles - Google Patents

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 signal lamp such as a tail lamp.

[0002]

2. Description of the Related Art FIG. 8 shows an example of the configuration of a conventional vehicle signal lamp 90 of this type. First, the vehicle signal lamp 90 is provided with a rotating light source having a light source 91 such as an incandescent lamp as a focal point. An object surface reflecting mirror 92 is provided, the light from the light source 91 is converged in the irradiation direction as parallel rays, and a lens 93 having a fisheye lens cut 93a is disposed in the optical path of the parallel rays. The light distribution characteristics are obtained by appropriately diffusing the above-mentioned parallel rays by the fish-eye lens cut 93a.

[0003]

However, in the above-described conventional signal light 90 for a vehicle, the light is diffused by the lens 93 closest to the viewer side to obtain the light distribution characteristic. At times, the surface of the lens 93 shines, and the display is poor in three-dimensional appearance, which causes a problem that the degree of freedom in design is restricted. Further, even in the non-lighting state, the fisheye lens cut 93a causes the lens 93 to lose transparency, and the impression of the vehicle signal light 90 as a whole becomes flat, and solving these points is an issue. I was

[0004]

According to the present invention, as a specific means for solving the above-mentioned conventional problems, a reflecting mirror for reflecting light from a light source as substantially parallel rays in an irradiation direction, and a reflecting mirror for the reflecting mirror are provided. In a vehicular signal lamp comprising a lens provided for generating light distribution characteristics in a reflected light beam, the lens is provided on a light source side and has a three-dimensional light distribution control lens and a single focus provided on an irradiation direction side. An object of the present invention is to solve the problem by providing a signal light for a vehicle, comprising a Fresnel lens having a distance.

[0005]

Next, the present invention will be described in detail based on an embodiment shown in the drawings. 1 and 2 show a first embodiment of a vehicle signal lamp according to the present invention. The vehicle signal lamp 1 includes a light source 2 such as an incandescent lamp.
And a reflecting mirror 3 having a paraboloid of revolution having the light source 2 as a focal point, thereby generating a parallel light beam in the irradiation direction, 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 located closer to the light source 2. , That is, on the inner surface of the vehicular signal lamp 1, and the Fresnel lens 5 is provided on a position on the irradiation direction side, that is, on the outer surface so as to allow direct external viewing.

At this time, the light distribution control lens 4 has an appropriate three-dimensional shape such as a conical concave surface having a flat bottom or a pyramid concave surface having a flat bottom, and the entire surface is subjected to, for example, a fish-eye lens cut 4a. Appropriate diffusion is given to the parallel light rays from the reflecting mirror 3. The light distribution control lens 4 may be formed as a flat lens when the three-dimensional appearance is not required for the appearance of the vehicle signal light 1.

The Fresnel lens 5 is formed as a convex lens.
Is subjected to a concentric Fresnel cut 5a.
At this time, the position of the focal point F of the Fresnel lens 5 is free, but if the position is the same as the position of the light source 2, another operation and effect can be obtained, and this point will be described later. .

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

At the time of transmission through the light distribution control lens 4,
The above-mentioned parallel rays are appropriately diffused by the fisheye lens cut 4a applied to the light distribution control lens 4, and the light distribution characteristics as the vehicle signal light 1 are set. In the vehicle signal lamp 1 of the present invention, a Fresnel lens 5 described later after passing through the light distribution control lens 4 is used.
Therefore, the reflection mirror 3 and the fisheye lens cut 4a are converged and diffused in consideration of this point.

The parallel light beam which has been appropriately diffused after passing through the light distribution control lens 4 passes through the Fresnel lens 5 and is refracted as a convex lens. At this time the fisheye lens cut 4
Since the light is diffused by a, the light is not focused clearly and the light distribution characteristics of the vehicle signal light 1 are satisfied.

At this time, when the vehicle signal lamp 1 is viewed from the irradiation direction side, the Fresnel lens 5 has the characteristic of a convex lens.
And the light distribution control lens 4 is magnified and viewed as shown by a virtual image G in the figure. Accordingly, the unevenness and the like provided for generating a three-dimensional effect on the light distribution control lens 4 are enlarged, and the three-dimensional effect is further emphasized.

Here, the operation and effect when the focal point F of the Fresnel lens 5 is substantially coincident with the position of the light source 2 will be described. All the light transmitted through the light distribution control lens 4 is reflected. The direct light D from the light source 2 is naturally included instead of the parallel light reflected by the mirror 3. However, since the direct light D is divergent light centered on the light source 2, it is normally distributed. Ineffective without being involved in forming 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 a parallel light beam, and the light distribution control lens 4 appropriately diffuses the light in advance. This direct light D can also be used to form a light distribution characteristic, and is thus added to the reflected light from the reflecting mirror 3 to further increase the light amount of the vehicle signal light 1. It is possible to increase.

FIG. 4 shows a second embodiment of the present invention. In the previous embodiment, the Fresnel lens 5 was used as the outer shell of the signal light 1 for a vehicle. The outer lens 6 having no effect may be covered, and in this case, the appearance of the non-lighting can be improved by making the shape of the outer lens 6 conform to the design of the vehicle body.

Further, by covering the Fresnel lens 5 with the outer lens 6, it is possible to prevent dust and the like from adhering to the Fresnel lens 5, so that the concentric Fresnel cut 5a applied to the Fresnel lens 5 can be either on the front or the back. However, the selection can be made in consideration of, for example, 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 a concentric Fresnel cut 5a is provided on both sides of the Fresnel lens 5. It is supposed to be applied. By doing so, the Fresnel lens 5 becomes equivalent to a biconvex convex lens, and thus can be formed as a short focal length lens.

FIG. 6 shows a fourth embodiment of the present invention. In this embodiment, two Fresnel lenses 5 are used, and the concentric Fresnel cut 5a is opposed to each Fresnel lens 5. It is to be applied to the surface on the side where By doing so, the two Fresnel lenses 5 are equivalent to a combination of plano-convex lenses whose convex surfaces face each other, and it is possible to reduce spherical aberration and the like, so that the virtual image G ( 3) can be viewed clearly and without distortion such as curvature of the image plane. 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 functions as a cylindrical lens that enlarges in only one direction (vertical direction).

Therefore, the light distribution control lens 7 has a three-dimensional shape only in the direction in which the magnification is performed (vertical direction). For example, the light distribution control lens 7 has a shape in which the cross-sectional shape in the vertical direction is constant as shown in the figure. I have. In particular, linear Fresnel cut 8
If the maximum effect when a is not desired, the light distribution control lens 4 of the first embodiment (see FIG. 1) may be used. Although not shown, the linear Fresnel cut 8a may be in the vertical direction. 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 three-dimensional light distribution control lens in which a lens is provided on the light source side and a Fresnel lens having a single focal length provided on the irradiation direction side are provided. As a vehicular signal light, a Fresnel lens, which is substantially a convex lens and has high transparency, is arranged on the irradiation direction side, and the light distribution control lens formed into a three-dimensional shape by seeing through the Fresnel lens is viewed, In addition, when this observation is performed, the magnification by the Fresnel lens is given, and when lit, a three-dimensional effect such as depth, which has not been obtained conventionally, is produced, which is an extremely excellent effect on improvement of the merchantability. To play.

Further, by setting the position of the focal point of the Fresnel lens substantially at the position of the light source, the direct light from the light source, which has conventionally been invalid in forming the light distribution characteristic, is converted into substantially parallel light. Converges on the range of the illumination angle, thereby increasing the amount of light of the vehicular signal lamp.

[Brief description of the drawings]

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

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

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

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

FIG. 5 is a sectional view showing a main part of a third embodiment of the vehicular signal light according to the present invention.

FIG. 6 is a cross-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 vehicle signal lamp according to the present invention.

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Signal light for vehicles 2 ... Light source 3 ... Reflector 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 the light source F …… Focus of Fresnel lens G …… Virtual image

Continuation of the front page (56) References JP-A-5-120902 (JP, A) JP-A-1-241701 (JP, A) JP-A-6-243703 (JP, A) , U) Actually open sho 59-26805 (JP, U) Actually open sho 63-39808 (JP, U) Actually open sho 62-104309 (JP, U) Actually open sho 62-104310 (JP, U) 5-31004 (JP, U) Japanese Utility Model 3-131011 (JP, U) Japanese Utility Model Publication No. 33-13681 (JP, Y1) (58) Fields investigated (Int. Cl. ⁶ , DB name) F21Q 1/00 G02B 3/08

Claims (3)

(57) [Claims] 1. A vehicular signal lamp comprising: a reflecting mirror for reflecting light from a light source as substantially parallel rays in an irradiation direction; and a lens provided for generating light distribution characteristics in the reflected light of the reflecting mirror. A signal lamp for a vehicle, wherein the lens comprises a light distribution control lens having a three-dimensional shape provided on a light source side and a Fresnel lens having a single focal length provided on an irradiation direction side. 2. The Fresnel lens has a concentric circular Fresnel cut in which a focal point converges at one point or a linear Fresnel cut in which a focal point converges linearly, and the light distribution control lens has a shape corresponding to the cut of the Fresnel lens. 2. The vehicle signal light 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.