JPS61158606A - Lighting apparatus - 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 lighting device suitable for use in vehicle lights, etc.]
This is particularly intended to improve the lighting effect in a lighting device that uses a large number of light emitting diodes as a light source.

[Conventional technology]

In recent years, with the development of semiconductor technology, high-brightness light-emitting diodes have been developed, and as they have become available at low prices, they are being considered as an alternative to light bulbs as a light source for vehicle lighting, especially brake lights and taillights. As an example, the one shown in FIG. 7 is known. Namely, 1 is a front lens formed by integrally and densely forming a diffuser lens consisting of many small convex lenses on the inner surface, 3 is a front lens disposed inside the front lens, and has a large number of light emitting diodes 4 arranged at predetermined intervals on the surface. A printed circuit board arranged with −.

5m, 5b is conductive foil, 6 is a lead wire such as gold wire.

T is a diode defining member disposed on the surface of the printed circuit board 30 and defining each light emitting diode 4; It has a large number of partitioned diode storage sections B, for example, made of tapered holes, and the wall surface thereof forms a reflective surface 9, thereby improving the lighting effect by effectively utilizing light.

[Problem that the invention seeks to solve]

By the way, in such a conventional lighting device, the light from the light emitting diode 4 is reflected by the reflective surface 9, and the point light source is turned into a surface light source and further diffused by the diffuser lens 2. Due to the refraction of light, the surface T& of the diode-defining member T is visible through the front lens 1,
Therefore, when the light is turned on, the entire surface of the front lens 1 is not irradiated with light, causing a problem in that uniform illumination is not achieved.

[Means for solving problems]

The lighting device according to the present invention has been made in view of the above-mentioned points, and includes a condenser lens of approximately the same size as each dionide housing formed in the diode defining member on the surface of the defining member. The diode accommodating portion is arranged to correspond to the diode accommodating portion, substantially rectangular diffusion lenses corresponding to the condensing lenses are densely formed on the inner surface of the front lens, and a light diffusing agent is mixed in the diode accommodating portion. It is filled with translucent resin.

[Effect]

In the present invention, the light from the light emitting diode chip is made into a uniform surface emission at the exit surface using a light-transmitting resin containing a light diffusing agent, and is further converted into a front lens by a condensing lens disposed on the surface of the diode defining member. By effectively making the light incident on a substantially rectangular lens, many uniform parallel light rays can be created and emitted. As a result, the entire surface of the front lens appears shiny when viewed from the front, and the surface of the diode-defining member is not visible through the front lens.

〔Example〕

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

Fig. 1 is a cross-sectional view of essential parts showing an embodiment in which the present invention is applied to one lamp of an automobile, Fig. 2 is a perspective view of a lens body and a diode defining member, and Fig. 3 is a perspective view of a front lens. It is.

In these figures, 1G is a tail light attached to the rear end of the automobile, and this tail light 10 includes a puncture cover 12 and a front lens 13, which are integrally combined to form a light body 11. Inside thereof, there is a substrate 14 on which a large number of light emitting diodes 4 are mounted, and a diode defining member 20.
and a lens body 30 are provided.

The substrate 14 is formed by extruding aluminum, and its entire surface is covered with an insulating film 15.
5, a large number of light emitting diodes 4 are arranged at predetermined intervals m
They are arranged in a ×n matrix. The light emitting diode 4 is covered with 5 m of conductive foil.

5b and lead wires 6 (see FIG. 4), each column (or row) is connected in series and connected in parallel to the power supply. A large number of fins 1 are provided on the back surface of the substrate 14.
6 is integrally provided in a protruding manner, thereby effectively dissipating the heat generated by the diode lighting resistor (not shown) and minimizing the adverse effects caused by the heat. Such a configuration is particularly effective in large-sized lamps incorporating hundreds of light-emitting diodes 4, in which it is necessary to take appropriate heat dissipation measures. Further, in order to enhance the heat dissipation effect, ventilation holes 17 are formed at appropriate locations on the back cover 12.

The diode defining member 20 is formed of an opaque synthetic resin into a plate shape, and has a large number of diode accommodating portions 21 corresponding to each light emitting diode 4.
40 surface through the insulating film 15. Each of the diode accommodating portions 21 has a wall surface that forms a reflective surface, and is formed of a tapered hole passing through the front and back surfaces of the diode defining member 200. The opening diameter on the front side is set larger than the opening diameter on the back side. Further, the front surface side opening ends of each diode housing section 210 are in contact with each other as shown in FIG. The light emitting diodes 4 are arranged in each diode housing 21 so that adjacent ones are separated from each other.

Each of the diode storage parts 21 is filled with a translucent resin 24 mixed with a light diffusing agent, thereby molding the light emitting diodes 4. Note that the wall surface of the diode storage section 21 can form a reflective surface without any special treatment by making the diode defining member 2G itself from synthetic resin of nine colors 2, for example, white, which has excellent light reflecting properties. are doing.

The lens body 30 is made of a transparent synthetic resin such as acrylic resin, and is disposed on the surface of the diode defining member 200. The lens body 30 has holes corresponding to the respective diode housing portions 21 on the surface thereof. A large number of condensing lenses 31 are integrally formed closely together. The condensing lens 31 is constituted by a substantially hemispherical spherical lens having a diameter that is the same as the diameter of the opening on the surface side of the diode housing portion 21 .

The lens body 30 (7) is provided on the inner surface of the front lens 13.
) A large number of diffusion lenses 40 corresponding to each condenser lens 31 are integrally formed in a dense manner. Diffusion lens 4
0 is constituted by a substantially square convex or concave lens in which the condenser lens 31 is inscribed, in other words, each side of the bottom is approximately equal to the diameter of the condenser lens 31. However, in this embodiment, the convex lens is Indicates when used.

In a taillight having such a configuration, the light emitted from each light emitting diode 4 is transmitted through a translucent resin 24 as shown in FIG.
The transmitted light A1 is diffused every time it hits the light diffusing agent mixed in the transparent resin 24, and therefore passes through the transparent resin 24 and exits from the surface thereof.
comes out in all directions. A part of this transmitted light A is transmitted to the lens body 30 corresponding to the light emitting diode 4.
a condensing lens 31 and a diffusing lens 4 in the front lens 13
0 and exits to the outside, but this emitted light becomes a parallel ray A that is substantially perpendicular to the surface of the front lens 13 due to the action of both lenses 31 and 40, and heads forward.

Here, each light emitting diode 4 itself is extremely small and is only a point light source, but the light diffused in all directions by the light diffusing agent and transmitted through the condensing lens 31 illuminates the entire surface of the diffusing lens 40 corresponding to the lens 31. Therefore, a surface light source is formed, and since light is emitted from the entire surface of the front lens 13, almost uniform illumination can be obtained and the illumination effect is improved. Further, since the diffusing lens 4G has a sufficient size and covers the corresponding condensing lens 31, the surface of the diode defining member 200 is visible due to the refraction of light even when the front lens 13 is viewed directly from the front. Never.

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

In this embodiment, a light emitting diode 4 is arranged on a conductive foil wired on an insulating film 15 via a terminal seat 50 made of aluminum or the like and formed in a substantially dish shape, and the inclined peripheral wall of this terminal seat 50 By using the inner surface as a reflective surface and reflecting the backward light emitted from the light emitting diode 4 forward, the light is effectively used. Diffusion engraving translucent resin 2
4 were packed and stacked in this order.

Note that the other configurations are the same as in the above embodiment.

It is clear that the same effects as in the above embodiment can be obtained also in such a configuration.

FIG. 6 is a sectional view of a main part showing still another embodiment of the present invention. In this embodiment, a condensing lens 31 having a larger diameter than the front end diameter of the diode housing 210 is provided, and the surface 20a''IiI of the diode defining member 20 is covered with a core lens 31. This embodiment is completely the same as the embodiment shown in FIG.

Although there is a possibility that the surface 201 of the diode defining member 20 is visible from the boundary part of the adjacent diffusion lens 4G, according to the structure of this embodiment, the light is condensed by the condenser lens 31 and then diffused by the diffusion lens 40. Therefore, the surface 20a portion is not visually recognized.

Although the above embodiments have all been described with respect to the case where the board 14 is made of aluminum, the present invention is not limited to this in any way, and it is understood that a general rigid printed circuit board may be used. Of course.

〔Effect of the invention〕

As explained above, in the lighting device according to the present invention, a condenser lens of approximately the same size as the diode housing part of the diode defining member is disposed corresponding to each diode housing part, and a condenser lens of approximately the same size as the diode housing part is disposed in correspondence with each diode housing part of the diode defining member. Correspondingly, substantially rectangular diffusion lenses are densely formed on the inner surface of the front lens, and the diode housing is filled with a light-transmitting resin mixed with a light-diffusing agent. It is possible to diffuse the transmitted light in all directions, thus turning a point light source into a surface light source, illuminating the entire surface of the front lens with almost uniform brightness,
Improve the lighting effect. Further, when the front lens is viewed directly from the front, the surface of the diode defining member is not visible through the front lens due to the refraction of light, and the quality of the lighting device can be improved.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part showing an embodiment of the present invention applied to a tail light of an automobile, FIG. 2 is a perspective view of a lens body and a diode defining member, and FIG. 3 is a perspective view of a front lens. FIG. 4 is a diagram for explaining the present invention in detail, FIG. 5 is a sectional view of a main part showing another embodiment of the invention, and FIG. 6 is a sectional view of a main part showing still another embodiment of the invention. FIG. 7 is a sectional view of a main part showing a conventional example of a lighting device. 4.φ...Light emitting diode, 12@...Pack cover, No. 13..Front lens, 14..Board, 20.
...Diode defining member, 21...Diode storage part, 24...Translucent resin, 30...Lens body, 31...Fist condensing lens, 40...Meeting/diffusion lens.

Claims (1)

[Claims] A large number of light emitting diodes are placed on a substrate at predetermined intervals.
A diode defining member having a large number of diode accommodating portions arranged in a matrix of ×n and surrounding each of the light emitting diodes and having a wall surface serving as a reflective surface is disposed, and at least each of the light emitting diodes is provided on the surface of the diode defining member. A large number of condensing lenses having approximately the same size as the diode housing portion and corresponding to the housing portion are disposed, and a plurality of condensing lenses each having a substantially square shape are arranged on the inner surface of a front lens disposed in front of the diode defining member. A lighting device characterized in that a large number of diffusion lenses corresponding to condensing lenses are densely formed, and each of the diode storage parts is filled with a translucent resin mixed with a light diffusion agent.