JPS5880604A - Illuminating device - Google Patents

Abstract

PURPOSE:To draw out light of optional wavelengths, for example, heat rays and rays for illuminating separately, from optional desired places of an optical transmission body by diffusing the desired wavelength distribution of the light propagating in the optical transmission body and releasing the same to the outside of the optical transmission body. CONSTITUTION:A light diffusing layer of a refractive index differing from the refractive index n deg. of an optical transmission body 2, for example, an epoxy resin layer 11, is coated on the surface of said optical transmision body. The refractive index n1 thereof is selected at about 0.87 to 1.3 n1 to n0 with respect to the refractive index n0 of the optical transmission body. Therfore, the light transmitted in the body 2 is released to the outside of the body 2 through the layer 11 and if the refractive index of the light diffusing body 11 is properly selected, the light of optional desired wavelengths is released selectively.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an illumination device that diffuses and emits a desired wavelength component of light propagated within a light carrier to the outside of the light carrier.

Silica glass fiber; < -, or so-called plastic optical fiber such as acrylic resin or polycarbonate resin,
Also, thin tubes, flat plates, etc. made of these materials are known as light carriers for light, particularly light in the visible region. When using the light transmitted through the light carrier as described above as an illumination body, it is necessary to diffuse and emit the light from the light carrier to the outside of the light carrier. The present invention relates to a lighting device that can selectively extract light of any desired wavelength from any location on a light carrier in the above-mentioned cases.

FIG. 1 is a schematic configuration diagram for explaining the operating principle of the present invention. In the figure, 1 is a light source, 2 is a light carrier, and the light source 1 is, for example, a normal light bulb, a fluorescent lamp, a laser, etc. light, LED,
Alternatively, various types such as the light output end of a light guide fiber can be considered, but any desired one can be used. A light diffusing layer, for example, an epoxy resin layer 11, having a refractive index different from the refractive index no of the light carrier 2 is coated on the surface of the light carrier 2, and its refractive index n1 is equal to the refractive index n of the light carrier.

n1/n6=about 0.87 to 1.3. Therefore, the light that has been transmitted within the light carrier 2 is emitted to the outside of the light carrier 2 through the light diffusion layer 11. At this time, by appropriately selecting the refractive index of the light diffuser 11, it is possible to Light of a desired wavelength can be selected and emitted.

FIG. 2 is a schematic configuration diagram for explaining an embodiment of the present invention. In the figure, reference numerals 11 to 13 are light diffusion sections, and 1] is a light diffusion section.

When the light diffusion layer is one layer, 12 indicates the case of two layers, and 13 indicates the case of three layers. By making the optical refractive indexes n1, n2, and ke of each layer different, the light emitted from each light diffusion section can be adjusted. For example, the light diffusion section 11 extracts the light necessary for illumination, the light diffusion section 12 extracts the light reflected from the heat ray R, and the light diffusion section 13 extracts the light that blocks the ultraviolet 1111V. It is something. In addition, when the light diffusion section is arranged only on one side of the light carrier,
゛□As shown in the figure, a reflective surface layer 3 may be provided on the side where the light diffusing section of the tip light carrier is not provided, and the light source 1
It is easy to understand that when the light rays from the light carrier 1 are parallel rays, it is sufficient to provide the reflective surface layer 4 on the end surface of the light carrier 1.

FIG. 3 is a schematic configuration diagram for explaining another embodiment of the present invention. In this embodiment, the light diffusing section is shaped like a lens, and the light diffusing section 14 is shaped like a convex lens to emit light. The light diffusing section 15 is shaped like a concave lens to disperse the emitted light.

This is what I did. In addition, when forming a convex lens, if the resin is dropped onto the light carrier, depending on the viscosity of the resin, the surface tension, the degree of contact with the base material (light carrier), etc.
It is possible to make a convex lens with a predetermined shape. When forming a concave lens, as shown in FIG. An appropriate amount of resin 6 is applied and cured. Next, an appropriate amount of resin 7 having a refractive index of n2 is applied on top of the resin 6 and cured. After that, when the masking film 5 is removed, the surface of the light carrier 2 is coated. , a concave lens whose curvature is determined by the surface tension of the resin, the inner diameter of the masking film, etc. can be formed.

As is clear from the above description, according to the present invention, light of any desired wavelength can be extracted from any desired location of the light carrier, for example, by separating heat rays and illumination lights, This selective separation makes it possible to use materials that are optically useful but unstable in terms of heat resistance and thermal stability in the illumination area, which has the advantage of increasing the degree of freedom in material design. There is 0

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram for explaining the operation of the present invention,
FIGS. 2 and 3 are schematic configuration diagrams for explaining the present invention in detail, respectively, and FIG. 4 is a diagram for explaining how to make the concave lens 15 shown in FIG. 3. 1. Light source, 2... Light carrier, 3.4... Reflective surface layer,
5 Masking film, 6.7...ItML 11~
15...Light diffusion section. Figure 1 Figure 2 Figure 3 Figure 4

Claims (3)

[Claims] (1) An illumination device comprising a light carrier and a light diffusing layer disposed on the surface of the light carrier and having a refractive index different from that of the light carrier. (2) The light diffusing layer is composed of a plurality of layers, and each layer has a different refractive index.
The lighting device according to item 1). (3) The lighting device according to claim 1 or 2, characterized in that the light diffusion layer has a lens shape.