JPH01204093A - Lighting fixture for vehicle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a vehicle lamp suitable for use as a tail light, a stop light, etc. The present invention relates to a vehicle lamp in which a Fresnel lens is formed on the inner lens.

[Conventional technology]

2. Description of the Related Art Conventionally, automobiles have been equipped with various types of lighting such as headlights, taillights, stop lights, and direction indicator lights, and their configurations vary depending on the type of vehicle.

Among these, lamps shown in FIGS. 6 to 8 are particularly known as lamps having a double lens structure in which the front opening of the lamp body is covered with an inner lens and an outer lens. this is,
The light source 2 is housed in the center of the interior of the lamp body 1, which is formed into a box shape that is long in the left and right direction and has an open front.
The front opening of the outer lens 3 and the inner lens 4
On the back surface of the outer lens 3, a diffuser lens 5 consisting of many small convex lenses is formed in close contact with each other, and on the back surface of the inner lens 4, the light from the light source 2 is converted into parallel rays approximately parallel to the optical axis. A Fresnel lens 6 is formed which leads the lens to the outer lens 3. This Fresnel lens 6 has a substantially triangular cross-sectional shape as shown in FIG. It is composed of a large number of sawtooth-shaped steps 7 that protrude concentrically around the optical axis, and the inclination angle θ of the slope 7a of each step T is smaller as it is closer to the optical axis center.
It is set to gradually increase in size as the distance increases. Note that the step 7 forms a complete annular projection at the center, but the inner lens 4 forms a complete annular projection at the outside.
It has an arc shape because it is cut by the top, bottom, left and right ends of.

[Problem to be solved by the invention]

By the way, in a vehicle lamp having such a configuration, direct light 10 from the light source 2 enters each step T of the Fresnel lens 6 and is optically controlled, but as the distance from the optical axis center increases, the step itself There was a problem in that the piles of lights were in the way and reduced the amount of light entering each step 7.

That is, as shown in FIG. 8, the slope 7a of each step 7
is not entirely illuminated by the direct light 10 from the light source 2, but the light is blocked by the inner step provided adjacent to the inner side of the step, so the slope portion 71 shown by diagonal lines is shaded by the light. And, moreover, this shadow part A
This is because the inclination angle θ of the slope 7a is larger at the outer step T, so the width increases as it goes outward. Therefore, this shadow is directly projected onto the outer lens 5, deteriorating the quality of the lamp and the illumination effect.

Therefore, the present invention solves the above-mentioned conventional problems, has a simple structure, and effectively guides the light from the light source to the shadow area of each step. It is an object of the present invention to provide a vehicular lamp that can reduce and prevent the occurrence of concentric shadows.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a lamp body that houses a light source and whose inner surface forms a reflective surface that reflects light from the light source forward, an outer lens that covers the front opening of the lamp body, and an inner lens. The inner lens has a Fresnel lens having a substantially triangular cross-sectional shape and consisting of a number of steps protruding concentrically around the optical axis, with the slope of each step adjacent to the inside of the step. The part of the inner step that is shaded by direct light from the light source is a lens part that controls the light reflected from the reflecting surface.

[Effect]

The lens section provided on the inner side of the slope of each step constitutes a reflected light control section that controls light from the reflecting surface, and cancels shadows caused by other steps provided adjacent to the inner side.

〔Example〕

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

FIG. 1 is an enlarged sectional view of a main part showing a first embodiment of a vehicle lamp according to the present invention, and FIG. 2 is a sectional view of the same lamp. In addition,
Components that are the same as those in FIGS. 6 to 8 are designated by the same reference numerals, and their explanations will be omitted. In these figures, the inner wall surface of the lamp body 1 forms a parabolic reflection surface 11 of revolution. Therefore, among the nine lights emitted from the light source 2, the reflected light 10a that is reflected by the paraboloid of revolution reflection surface 11 becomes a parallel ray that is substantially parallel to the optical axis and is directed forward to the Fresnel lens 6 of the inner lens 4. irradiate.

Slope 7 of each step 7 constituting the Fresnel lens 6
The part of a that is shaded by the direct light 10 from the light source 2 due to another step provided adjacent to the inside of the step reflects the reflected light 10a from the paraboloid of revolution reflection surface 11. It constitutes the lens section 14 to be controlled. This lens portion 14 has a rough surface by being textured, and diffusely reflects the reflected light 10a.

Reference numeral 15 denotes a lens mounting portion having a U-shaped cross section and having an annular groove 16 integrally provided in the front opening of the lamp body 1. The side wall tip 3a of the outer lens 3 is inserted into the annular groove 16. It is fixed with adhesive 17. On the other hand, the peripheral edge of the inner lens 4 is fixed to the front opening of the lamp body 1 by ultrasonic welding or the like.

Thus, according to the vehicle lamp having such a configuration,
The reflected light 10a that hits the paraboloid of revolution reflection surface 11 and is reflected illuminates the portion of each step 7 that is in the shadow with respect to the direct light 10 from the light source 2, that is, the lens portion 14, so the shadow is effectively canceled. Therefore, a lamp with good visibility can be constructed. In this case, if the lens part 14 is not provided in the shadow part of each step 7, the part will be doubly irradiated by the direct light 10 from the light source 2 and the reflected light 10a from the paraboloid of revolution reflection surface 11. There is a large difference in brightness between the areas illuminated by only the reflected light 10a, and the shadow cannot be canceled.
By diffusely reflecting 0a, the brightness increases and the difference in illumination from the double irradiation area decreases, making it possible to effectively cancel shadows.

FIG. 3 is a sectional view of a main part showing a second embodiment of the present invention. In this embodiment, the part of the slope 7a of each step T that is shaded by the direct light 10 is removed by the back surface 184 of the inner lens 4, and a lens portion 19 extending from a concave lens is formed on the bottom surface. be. Even in such a configuration, the lens portion 19 reflects the reflected light 1 from the paraboloid of revolution reflection surface 11.
0a, it is possible to prevent the occurrence of shadows due to direct light 10.

FIG. 4 is a sectional view of a main part showing a third embodiment of the present invention.

In this embodiment, the inner surface of the lamp body 1 is made of a reflecting surface 20 consisting of a simple slope inclined at an appropriate angle with respect to the optical axis, so that the light from the light source is reflected forward.
The rest of the structure is the same as that of the second embodiment shown in FIG. In this case, the reflected light 10a does not become a parallel ray parallel to the optical axis, but the maximum height of the step 7 is approximately several mm, and the amount of reflected light IQa that enters the lens portion 19 is not significantly cut. Therefore, shadows caused by the direct light 10 can be effectively canceled out.

FIG. 5 is a sectional view of a main part showing a fourth embodiment of the present invention.

In this embodiment, the inner surface of the lamp body 1 is formed into a concave curved surface 21 with an appropriate curvature, and this curved surface 21
A plurality of, for example, four annular reflecting surfaces 22m, 22b, 22c, 2
2d concentrically protruding from the optical axis. The annular reflecting surfaces 22a to 22d are each formed of a part of the same paraboloid of revolution with the light source 2 as the focal point. Therefore, among the light emitted from the light source 2, the annular reflecting surface 22a~
The reflected light 10a that has been reflected by hitting 22dK turns into parallel light rays parallel to the optical axis, is directed forward, and illuminates the lens portion 19. The inner surface 21 of the lamp body 1 does not have a function as a reflective surface. Therefore, the slope 7a of each step 7 is irradiated only with the direct light 10, and the light amount is balanced with the reflected light 10a that irradiates the lens portion 19.

Note that the other configurations are the same as the second embodiment shown in FIG.

〔Effect of the invention〕

As described above, according to the vehicle lamp according to the present invention, in the lamp in which the inner surface of the lamp body is a reflective surface and the inner lens is provided with a Fresnel lens, direct light from the light source is reflected by the slope of each step of the Fresnel lens. On the other hand, the part that becomes a shadow is a lens part, and the lens part is illuminated by the reflected light that comes out from the light source and is reflected by the reflecting surface, so that the shadow caused by direct light can be canceled or made less noticeable. To improve the lighting effect without damaging the appearance of the lamp when it is lit. Furthermore, since the lens portion controls reflected light through its lens action, uniform illumination of the entire surface of the lens is possible.

[Brief explanation of the drawing]

FIG. 1 is an enlarged cross-sectional view of a main part showing a first embodiment of a vehicle lamp according to the present invention, FIG. 2 is a cross-sectional view of the same lamp, and FIG. 3 is a cross-sectional view of a main part showing a second embodiment of the present invention. Figure 4 is a cross-sectional view of a main part showing a third embodiment of the present invention, Figure 5 is a cross-sectional view of a main part showing a fourth embodiment of the present invention, and Figure 6 is a cross-sectional view of a conventional lamp. FIG. 7 is a front view, and FIG. 8 is a rounded diagram illustrating the occurrence of shadows due to the Fresnel lens. 1... Lamp body, 2... Light source, 3... Outer lens, 4... Inner lens, 6...
Fresnel lens, 7...step, Ta---...slope, 7b...O vertical plane, 10...direct light, 1
0a... Reflected light, 11... Paraboloid of revolution reflection surface, 14.19... Lens section, 22a-22d...
...Annular reflective surface. Patent applicant: Koito Manufacturing Co., Ltd.

Claims (1)

[Claims] It includes a lamp body that houses a light source and whose inner surface forms a reflective surface that reflects light from the light source forward, and an outer lens and an inner lens that cover the front opening of the lamp body, and the inner lens has a cross-sectional shape. It has a Fresnel lens that is approximately triangular in shape and consists of a number of steps protruding concentrically around the optical axis, and the slope of each step allows direct light from the light source to be absorbed by the inner step adjacent to the inside of the step. A vehicular lamp characterized in that a portion that would eventually become a shadow is a lens portion that controls reflected light from the reflecting surface.