JP2005085558A - Collected led light source device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a collected LED light source in which the optical axes of LEDs are arranged and fixed so as to cross at one point rather than are arrayed in parallel and which is used as a light source of an optical equipment. <P>SOLUTION: A conductor having a superior electric and thermal conductivity is used as a substrate and one pole of LEDs is fixed to this and the other pole is enveloped by an insulating material and is made to pass through a hole penetrated in the supporting substrate. This substrate works as a heat radiating plate for the LEDs. Furthermore, the LEDs having not a large divergence angle are used and the optical axes of individual LEDs are collected at one point, thereby this condensing point can be made as a false secondary point-like light source. Thus, this becomes to have a configuration that can be processed by the conventional optical technology, and a prompt transition to practical use can be made. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  It belongs to optical equipment and lighting equipment.

  Conventionally, LEDs have been used for display as small lamps of a neon lamp or lower. However, in recent years, LEDs having high luminous intensity have been developed as display and light sources to satisfy the three primary colors of light. At present, it is simply arranged on the substrate and has a sufficient luminous intensity as a surface light source, but even if the luminous flux divergence angle of each LED is narrow, it is impossible to condense in that case, and it is required as a light source for an optical system Some point sources are far away.

In optics, a point light source is obtained as an ideal, but in practice, a certain size is required as a light source depending on the application. However, there is a limit to this, and in a finite optical system, a light source corresponding to the optical path length is required.
FIG. 3 shows a conventional system in which individual optical axes of LEDs having a diffusion angle of ± 10 degrees are arranged in parallel. The broken line indicates the state where the light flux emitted by each LED spreads in the irradiation space. It is not a parallel light beam at ± 10 degrees, but it is close to the scattered light to be processed by the optical system. I can't.

  When arranging the LEDs on the substrate, it is reasonable to arrange the LEDs for the purpose of arranging them more closely and to arrange the optical axes of the LEDs in parallel. It is not effective in the system. The substrate to be arranged may be a flat surface or a spherical surface. However, if the optical axis of each LED is directed to an arbitrary point, and an LED having a small divergence angle is used as the LED, the set point of the optical axis is secondary. It can be a point light source.

  An illumination system using an LED has an advantage that it generates less heat and consumes less power than an illumination system using an ordinary lamp, and has already been used for surface illumination, optical characters, etc. in some industries. Even in the optical industry, low power consumption and brightness are desirable, but surface illumination is far from the uniformity of the illuminated surface required by optics and is not in a usable range. Here, by using the method according to the present invention, it becomes a range that can be processed by the conventional optical technology, and the practical application is established.

An LED is basically a two-pole electric element, which consumes electric power to emit light, partly emits light and partly heats, deteriorating the element itself. If it is a small amount, it can be naturally cooled, but if more than 100 elements are arranged densely, the amount of heat generation increases.
A material with good electrical and thermal conductivity is used as the LED placement board, the support board is one pole, the LED is fixed with the optical axis determined by this, the other pole is covered with an insulating material, and the LED is passed through the hole in the support board Drive. By doing so, the deterioration of the element due to heat generation is prevented and the purpose of light collection is also achieved.

  FIG. 1 shows an example in which LEDs having a diffusion angle of ± 10 degrees are arranged in a spherical surface. Although the figure is reduced for the sake of understanding, the luminous flux from the LED can be made almost condensing.

FIG. 2 shows an example in which the LEDs used in Example 1 are arranged on a flat substrate. Although the light condensing state is slightly inferior to that in Example 1, the light condensing state is better than that in the parallel arrangement as shown in FIG.

  The development of LEDs that are 100 times brighter than conventional ones has progressed, and if an assembly is constructed, it will be in a range that can be used as a light source for low-illuminance optical devices and will be fully usable in the very near future. it is conceivable that.

The situation where LED was arrange | positioned on the spherical surface of Example 1 is shown. The situation where LED was arrange | positioned on the plane of Example 2 is shown. The example which has arrange | positioned LED in parallel is shown.

Claims (2)

  A collective LED light source device in which LEDs (light emitting diodes) are arranged and fixed so that the optical axes of the LEDs intersect at one point rather than in parallel when used as a light source of an optical device. The heat generated by the LED connected to the fixed substrate by using a good conductor of electricity and heat as the LED support substrate, fixing one electrode of the LED to the support substrate, and enclosing the other electrode with an insulator and passing through a hole formed in the substrate. LED light source device that has the effect of absorbing and radiating light.

Images