JPS62229701A - Lamp apparatus 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 that uses a light emitting element such as a light emitting diode (hereinafter abbreviated as LBD) as a light source, and particularly has an excellent diffusion effect and can provide uniform illumination. This is how it was done.

[Conventional technology]

In recent years, with the development of semiconductor technology, the development of high-brightness LEDs has slowed, and they have become available at low prices.
Consideration is now being given to using it instead of a light bulb as a light source for vehicle width lights, especially brake lights and tail lights.
As an example, the one shown in FIG. 4 is known. That is,
This vehicle lamp includes a printed circuit board 2 on the surface of which a large number of LEDs 1 are arranged at predetermined intervals, and a large number of lens cuts 3 arranged on the surface of the printed circuit board 2 and on the inner surface of the IJD 1. It is constructed with a correspondingly formed lens 4. The lens cut 3 refracts and reflects the light 7 of the LED 1 that has entered the cut 3 forward, and has a projection extending from a substantially paraboloid of revolution to a concave portion 5 at the light end for housing the LED 1. The peripheral wall 5a and bottom surface 5b of the recessed portion 5 constitute an incident surface of the light 7. The lens cut 3 is closely opposed to the printed circuit board 2,
By making most of the light 7 emitted from the IJD 1 enter the cut 3, light loss is reduced. Note that 8 is a conductive pattern and 9 is a wire bonding.

[Problem that the invention seeks to solve]

However, in such conventional vehicle lamps, so-called sink marks are likely to occur on the surface of the lens 40 and in the portion corresponding to the lens cut 3 during lens molding. Therefore, lens 4
There was a problem in that the amount of light emitted in front of the lamp was small, making it impossible to obtain a sufficient illumination effect.

[Failure to solve the problem]

The vehicle width lamp according to the present invention was made to solve the above-mentioned problems, and includes an inner lens arranged behind an outer lens having a large number of diffusion lenses formed on the inner surface,
A plurality of refracting and reflecting parts are formed on the back surface of the inner lens, corresponding to each light emitting element, to refract and reflect the light emitted from the light emitting element and entering the lens forward, and a plurality of convex curved parts are formed on the front surface of the inner lens. are formed corresponding to each of the light emitting elements.

[Effect]

In the present invention, since the convex curved surface part and the refraction/reflection part are provided on the surface layer of the inner lens, it is possible to efficiently condense the υ light through these parts and guide it forward. Additionally, the outer lens is a diffusion lens that effectively diffuses light, making uniform illumination possible.

〔Example〕

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

FIG. 1 is a sectional view of a mounting part showing an embodiment of an axle lamp according to the present invention, and FIG. 2 is a plan view of a main part of an inner lens.

In these figures, in this embodiment, a lamp body 13 is composed of an outer lens 11 and a pack cover 12.
An inner lens 14 and a substrate 1 such as a printed circuit board are installed inside the
5, and a plurality of LEDs 1 are arranged on the surface of the substrate 15 at predetermined intervals.

The outer lens 11 is attached to the pack cover 12 so as to cover the front opening of the pack cover 12, and the inner surface thereof is densely formed with a diffusion lens 1B consisting of a large number of convex lenses.

The inner lens 14 is disposed between the outer lens 11 and the substrate 15, and a number of refractive/reflective parts 17 are formed protruding from the back surface of the inner lens 14, corresponding to each of the LEDs 1, respectively. This refractive/reflective portion 17 is formed in a shape exactly the same as the conventional lens cut 3 shown in FIG. 4, so a description thereof will be omitted. On the other hand, a plurality of convex curved portions (convex lenses) 18 are provided on the surface of the inner lens 140 for each of the LEDs 1. In other words, they are formed in a protruding manner corresponding to each refractive/reflective portion 17, respectively.

In this case, the convex curved surface part 18 and the refractive reflection part 17 are formed so that their optical axes coincide with each other, and the LBD is placed on the optical axis.
1 is located. Further, in this embodiment, the diameter D1 of the convex curved surface portion 18 and the opening diameter Ds of the recessed portion 5 formed at the tip of the refractive/reflective portion 17 are set approximately equal, and the diameter D8 of the bottom surface 5b of the recessed portion 5 is Said D1. I set it to a small value, but
However, the present invention is not limited to this, and as shown in FIG. In the example, the bottom surface 5bt of the concave portion 5 is formed in a convex shape, but it may be a flat surface.

Each of the LEDs 1 is made of a semiconductor chip, and is made of transparent paulownia resin 2.
By shifting the mold with 0, outside air is protected.

In the axle lamp having such a configuration, each LED
The light emitted from
and enters the refractive/reflective section 17 corresponding to the LED 1. Of these, the light incident from the circumference i5a is refracted forward by the circumferential wall 5a, and is further totally reflected by the inner surface of the refraction/reflection portion 17 to head forward.

Then, it passes through the inner lens 14, and the outer lens 1
1, it is diffused by the diffusing lens 1B. On the other hand, the light that has entered the refractive/reflective portion 17 from the bottom surface 5b is refracted forward by the bottom surface 5b, is condensed by passing through the convex curved surface portion 18, and when passing through the outer lens 14,
The light is diffused by the diffusion lens 16. Therefore, the entire surface of the outer lens 11 can be illuminated more brightly and uniformly, and the illumination effect can be improved.

That is, in this embodiment, since the light that is once refracted and reflected forward by the refractive/reflective portion 17 and the convex curved surface portion 1B and then condensed is diffused in all directions by the diffusing lens 16, the portion corresponding to LIdD 1 The light does not brighten locally, but illuminates the entire surface with almost uniform brightness.

Further, by providing the convex curved surface portion 18, it is possible to prevent the occurrence of sink marks during lens molding, thereby increasing the degree of freedom in the shape, size, etc. of the refractive/reflective portion 17. Therefore, it is possible to form the refractive/reflective portion 17 with a large light condensing degree, increasing the amount of light directed forward and improving the illumination effect.

In addition, in the above embodiment, the diffusion lens 1 of the outer lens 11
Although the lens 6 is made of a convex lens, the same effect can be obtained even if a small concave lens is used.

〔Effect of the invention〕

As explained above, the vehicle lamp according to the present invention refracts and reflects the light emitted from the light emitting element forward by the refractive reflection part and the convex curved part provided in the inner lens, and diffuses it by the diffusion lens of the outer lens. I configured it so that
Almost the entire surface of the outer lens can be illuminated with uniform brightness, and the illumination effect can be improved. Furthermore, the convex curved surface portion allows the condensing power of the thinner lens to be set to be large, so that light can be condensed efficiently and light loss can be reduced.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a main part showing one embodiment of a vehicle lamp according to the present invention, FIG. 2 is a plan view of a main part of an inner lens, and FIG. 3 is a sectional view of a main part showing another embodiment of an inner lens. Figure, 4th
The figure is a sectional view of a main part of an example of a conventional lamp. 1...LEDl 2-...-Printed circuit board, 3#.
・・・Lens cut, 5・@0・Concave portion, 11・・・・
Outer lens, 12...Pack cover, 13--
- Lamp body, 14... Inner lens, 15...
Substrate, 16... Diffusion lens, 17... Refraction/reflection section, 18... Convex curved surface section.

Claims (1)

[Claims] an outer lens having a plurality of diffusion lenses formed on its inner surface and covering the front opening of the pack cover; a substrate having a plurality of light emitting elements disposed on its surface at predetermined intervals and located behind the outer lens; An inner lens is provided between the substrate and the outer lens, and on the back surface of the inner lens there are a plurality of refractive and reflective elements that refract and reflect light emitted from the light emitting element and incident into the lens forward. A portion is formed corresponding to each of the light emitting elements, and a plurality of convex curved portions are formed on the surface corresponding to each of the light emitting elements to condense light transmitted through the lens. Vehicle lighting.