JPS61158607A - 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] [Field of Industrial Application] The present invention relates to a lighting device suitable for use in a vehicle lamp, etc., and particularly to a lighting device that uses a large number of light emitting diodes as a light source. This is to improve the quality of the product.

[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 a replacement for light bulbs as a light source for vehicle lighting, especially brake lights and taillights. As an example, the one shown in FIG. 6 is known. Namely, numeral 1 is a front lens formed by integrally and densely forming a diffuser lens consisting of many small convex lenses on the inner surface, and numeral 3 is a front lens having a large number of light emitting diodes 4 disposed inside the front lens and arranged at a predetermined interval on the thorny surface. Printed circuit boards arranged at 5a and sb
1 is a conductive foil, 6 is a lead wire, and 7 is a diode defining member disposed on the surface of the printed circuit board 3 to define each light emitting diode 4, and this diode defining member 7 is located at the insertion position of each light emitting diode 4. It has a large number of diode accommodating parts 8 made of, for example, Taber holes, which partition the diodes 4, and the walls thereof form reflective surfaces 9, thereby making effective use of the light. Improves lighting effects.

[Problem that the invention seeks to solve]

By the way, in such a conventional lighting TC device, the light from the light emitting diode 4 is reflected by the reflective surface 9, the point light source is used as a surface light source, and the light is further diffused by the diffusing lens 2. However, when the front lens 1 is viewed directly from the front, When this happens, the surface T1 of the diode defining member T is visible through the front lens 1 due to the refraction of light.Therefore, when the light is turned on, the entire surface of the front lens 1 is not irradiated with light, causing a problem in terms of uniform illumination. .

[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 that is approximately the same size as each diode housing portion formed in the diode defining member and is arranged in correspondence with the housing portion. C [Function] According to the present invention, a large number of diffusing lenses smaller than the condensing lens are densely formed on the inner surface of the front lens. The light from the υ light-emitting diode is guided forward as a parallel beam by the condensing lens arranged corresponding to the diode housing, and this is diffused by the diffusion lens of the front lens, so that the entire surface of the front lens is illuminated. It can be illuminated, and when viewed from any direction, the front lens will not be exposed to light and the interior will not be visible.

〔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 of the present invention applied to an automobile taillight, Fig. 2 is a perspective view of a lens body and a diode forming member, and Fig. #lc3 is a perspective view of a front lens. It is. In these figures, reference numeral 10 denotes a tail light attached to the rear side end of the automobile. The substrate 1 includes a substrate 14 on which a large number of light emitting diodes 4 are mounted, a diode defining member 20, and a lens body 30.
A light emitting diode 4 is made of aluminum, its entire surface is covered with an insulating film 15, and a large number of light emitting diodes 4 are arranged in an m×n matrix on the insulating film 15 at predetermined intervals. 4 are connected in series in each column (or row) by conductive foil and leads fJi (none of which are shown) K, and are connected in parallel to the power supply. A large number of fins 16 are integrally protruded from the back surface of the substrate 14, and a resistor for lighting the diode (
04? effectively dissipates the heat generated (not shown) and minimizes the negative effects of heat generation. In addition, such a structure is considered effective since it is necessary to take various measures for heat dissipation in a cauldron lamp incorporating hundreds of light emitting diodes 4. In order to enhance the heat dissipation effect, ventilation holes 11 are formed at appropriate locations in the bank cover 12.

The diode defining member 20 is formed into a plate shape from an opaque synthetic resin, and has a large number of diode accommodating portions 21 corresponding to each light emitting diode 4.
Each diode accommodating portion 21 fixed to the surface of the diode through the insulating film 15 is formed of a substantially tapered hole penetrating the front and back surfaces of the diode defining member 20, the wall surface of which is a reflective surface 22. The opening end diameter on the front side is set larger than the opening end diameter on the back side. Further, as shown in FIG. 2, adjacent opening ends on the front side are in contact with each other. The light emitting diodes 4 are arranged in each diode storage section 21 so that adjacent light emitting diodes 4 are separated from each other. Note that the wall surface of the diode storage section 21 can be formed as a reflective surface without any special treatment because the diode defining member 2G itself is made of a synthetic resin material with excellent light reflecting properties and has nine colors, for example, white. 22 is formed.

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 20. The lens body 30 has holes corresponding to the respective diode housing portions 21 on the surface of the lens body 30. A large number of condensing lenses 31 are integrally formed in a dense manner. In the condensing lens 31, the front end of the diode accommodating portion 210 is inscribed, in other words, each side of the bottom has a diameter approximately equal to the diameter of the front opening end.

The lens 31 is composed of a hemispherical spherical lens having an approximately equal rectangular outline shape, and the light emitting diode 4 is arranged at the focal position it of this lens 31 (or at its near circumference).

On the inner surface of the front lens 13, a large number of diffusing lenses 40, which are concave lenses smaller than the condensing lens 31, are densely formed.This diffusing lens 40 also has a substantially rectangular outline shape. In the taillight having such a configuration, most of the light emitted from each light emitting diode 4 passes through the lens body 30 and the front lens 13. In this case, since the diode 4 is placed at the focal point of the condensing lens 31, the direct light AI directed forward is refracted when it passes through the condensing lens 31 corresponding to the diode, and reaches the surface of the front lens 13. Parallel rays A2 and Nashi, which are almost orthogonal to
It functions as a so-called surface light source, and then the diffuser lens 4
When the reflected light A3 diffused by 0 and reflected by the reflective surface 22 passes through the lens body 30 and the front lens 13, it is focused by the condensing lens 31 onto the diffusing lens 40, similarly to the direct light AI.

Here, each light emitting diode 4 is itself extremely small;
Although it is a point light source, it is refracted by the lens 31 and becomes a parallel ray A! Since it is directed forward, it can be regarded as a surface light source with a wide area.Moreover, the parallel light ray AI is refracted and diffused by the diffusing lens 40 at a refraction angle according to the refractive index of the lens 40, so the surface lens 130 Illuminates the entire surface with almost uniform brightness, improving lighting effects. Furthermore, even when the front lens 13 is viewed not only from the front but also from an oblique direction, the surface of the diode defining member 20 and the inside of the diode housing 21 are not visible because the condensing lens 31 and the diffusing lens 40 shine. .

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

In this embodiment, a terminal seat 5 made of aluminum or the like is formed into a substantially dish shape on a conductive foil sa wired on an insulating film 15.
A light emitting diode 4 is arranged through the terminal seat 50.
By using the inner surface of the inclined peripheral wall as a reflecting surface 51 and reflecting the backward light A4 of the light emitted from the light emitting diode 4 forward, the light is effectively used, and each diode storage section 21 Each light emitting diode 4 is molded by filling a transparent resin 52 inside, and the surface portion of the resin 52 corresponding to each diode storage portion 21 is shaped into a dome shape (
The condenser lens 55 is formed by molding it into a spherical shape. Note that the other configurations are completely the same as in the above embodiment.

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

FIG. 5 is a perspective view of a main part of a diode defining member showing still another embodiment of the present invention. In this embodiment, the diode storage portions 21 are formed into a pyramid shape in accordance with the arrangement pitch of the condenser lenses, and the surface width between adjacent diode storage portions 21 is made small. It will be easily understood that with such a configuration, an effect can be expected in which the surface of the diode defining member 20 is less visible.

Incidentally, in the above embodiments, the case where the board 14 is made of aluminum has been described, but the present invention is not limited to this in any way, and a general rigid printed circuit board may be used. Of course.

Further, in the above embodiment, a concave lens is used as the diffusion lens 40 of the front lens 13, but a convex lens may be used.

〔Effect of the invention〕

As explained above, in the lighting device according to the present invention, a condenser lens having approximately the same size as the diode housing part is disposed corresponding to each diode housing part of the diode defining member, and a condenser lens is disposed in the diode housing part. The light emitting diode that is to be emitted from the light emitting diode is placed at or near the focal point of the condensing lens, and a large number of diffusing lenses smaller than the condensing lens are densely formed on the inner surface of the front lens. When the light passes through the front lens, it can be diffused, thus making it easier to see from an oblique direction.

In addition, the condensing lens arranged corresponding to the diode storage part directs the light from the light emitting diode forward as parallel rays, and can turn a point light source into a surface light source, which covers the entire surface of the front lens. illuminates with almost uniform brightness to improve lighting effects. Furthermore, when looking directly at the front lens, the diffusing lens and the condensing lens shine, and the surface of the diode defining member and the inside of the diode housing are not visible, thereby improving the quality of the illumination device.

[Brief explanation of drawings]

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. Figure s4 is a cross-sectional view of a main part showing another embodiment of the present invention, Figure 5 is a perspective view of a main part showing still another embodiment of the present invention, and Figure 6 is a cross-section of a main part showing a conventional example of a lighting device. Illustrated. 4...Light emitting diode, 12...Reference pack cover, 13...Front lens, 14.Front lens, 20.
. . . Diode defining member, 21 . . . 6. Diode housing portion, 30 . . . Lens body, 31 . . . Condensing lens, 40 . . . Diffusion lens. Figure 1 Figure 5

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 parts arranged in a xn matrix and surrounding each light emitting diode is disposed, and each of the diode accommodating parts has a plurality of diode accommodating parts having approximately the same size as the accommodating part. A condensing lens is disposed, and each of the light emitting diodes is positioned at or near the focal point of the condensing lens, and a front lens is disposed in front of the condensing lens, and a front lens is disposed in front of the condensing lens. A lighting device characterized by forming a large number of small diffusion lenses closely packed together.