JPH028335Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an illumination or display device that uses a light emitting diode as a light source and is suitable for use in tail lights, turn signal lights, indicator lamps, etc.

[Conventional technology]

In recent years, with the development of semiconductor technology, high brightness light emitting diodes (hereinafter referred to as LEDs) have been developed and are now available at low cost.
Because it can emit light in a variety of colors, including yellow, it has come to be widely used as a light source for automobile taillights, brake lights, and indicator lamps for electrical equipment. The LED is
They are usually made as PN junction diodes of intermetallic compound semiconductors such as gallium phosphide (GaP), gallium aluminum phosphide (GaAlP), and gallium arsenide phosphide (GaASP), and when a forward current is passed through the PN junction, a certain It emits light of a wavelength, and as shown in FIG. 4, it is constructed by covering a semiconductor pellet 1 with a highly transparent epoxy resin 2 and molding the resin 2 into a dome shape. In this case, the epoxy resin 2 functions as an envelope that isolates the semiconductor pellet 1 from the atmosphere and mechanically protects it, and
(n is the refractive index), it functions as an optical lens that matches the refractive index with the semiconductor pellet 1 and improves the directionality of light. In addition, 3 in the figure is a bonding wire, 4A, 4B are lead wires,
5 is a stem.

[The problem that the idea attempts to solve]

By the way, as shown in Figure 5, LEDs have strong directional light output (strong brightness when viewed from the front, but hard to see from the side) and weak LEDs (low brightness, but can be seen from both the front and side). There are two types (one that can be seen), so you need to choose one depending on the purpose of use. However, there is too little freedom of choice when choosing between the two, and it is difficult to choose between the two, and it is difficult to choose between the two. There are cases where a device with high brightness and visible from both sides is required.

The present invention was developed in view of these circumstances, and its purpose is to provide an illumination or display device that can optically control light emission output and obtain desired directivity. .

[Means for Solving the Problems] In order to achieve the above object, the lighting or display device according to the present invention controls the light from the light emitting diode to the portion of the front lens corresponding to the light emitting diode, and adjusts its directivity. It is equipped with two light control sections that change the light.

[Effect]

In the present invention, the light control section diffuses or condenses the light of the light emitting diode and changes the original directivity of the light emitting diode.

〔Example〕

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

FIG. 1 is a sectional view showing an embodiment of a lighting or display device according to the present invention. The LED itself is composed of a semiconductor pellet (not shown), a transparent resin 2, a lead wire 4, etc., just like the conventional structure shown in FIG. The tip of the transparent resin 2 is formed into a dome shape and diffuses the direct light a that comes out from the semiconductor pellet and is directed toward the tip.

17 is the front lens placed in front of the LED,
On the back side, there are first, second, and two light control units 20,
21 is formed corresponding to the LED 17.
These light control parts 20 and 21 are for changing the directivity of the light that the LED itself has, and the first light control part 20 is composed of an elliptical concave curved surface (concave part), The light control section 21 is the first light control section 2
It consists of a hemispherical protrusion protruding from the center of the 0.

Note that 30 is a light shielding film that covers the non-illuminated portion of the surface of the front lens 17.

In such a configuration, out of the light a emitted from the LED, the light directed diagonally forward is transmitted to the first light control unit 2.
The light diffused by 0 and directed forward is condensed by the second light control section 21. As a result, as an effect of the second light control unit 21, the brightness is extremely strong when viewed from the front, but it is difficult to see from the side, and the direction of the light emission output is further flattened from the equal light output curve shown in FIG. This makes it possible to illuminate the area further ahead in a spot-like manner. Therefore, the second light control section 2 of the front lens 17
The area corresponding to 1 is illuminated significantly brighter than the surrounding area.

FIG. 2 is a sectional view showing another embodiment of the present invention. In this embodiment, a first light control section 20 made of an elliptical concave curved surface is provided on the back surface of the front lens 17,
A second light control section 22 consisting of a hemispherical protrusion is provided on the surface. In such a configuration,
Since the second light control unit 22 diffuses the light from the LED in the horizontal direction, it is possible to obtain directivity that is difficult to see from the front and easy to see from the side.

In FIG. 3, a second light control section 26 consisting of a hemispherical concave portion is provided at the center of the first light control section 20 on the back surface of the front lens 17, contrary to the embodiment shown in FIG. In this case, since the second light control section 26 diffuses the light in the horizontal direction like the second light control section 22 in FIG. 2, it has directivity that is difficult to see from the front and easy to see from the side.

[Effect of idea]

As explained above, the illumination or display device according to the present invention is constructed by providing two light control sections for changing the direction of light on the front lens placed in front of the light emitting diode, so that the lighting or display device according to the present invention The directivity of the light emitting output can be changed freely, and the directivity suitable for the purpose of use can be obtained. Therefore, the illumination or display effect can be further improved.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of one embodiment of the illumination or display device according to the present invention, Fig. 2 is a sectional view showing another embodiment of the invention, and Fig. 3 is a sectional view showing still another embodiment of the invention. 4 is a side view of a conventional light emitting diode, and FIG. 5 is a diagram showing an equal luminous output curve of the conventional light emitting diode. 1... Semiconductor pellet, 2... Transparent resin, 4...
...Lead wire, 20...First light control section, 17...
Front lens, 21, 22, 26... second light control section.

Claims (1)

[Scope of utility model registration request] A device for illuminating a front lens using a light emitting diode as a light source, characterized in that two light control units are provided in portions of the front lens corresponding to the light emitting diode to control light from the light emitting diode and change its directivity. lighting or display devices.