JPS5882204A - Light diffusing device - Google Patents

Abstract

PURPOSE:To diffuse effectively the light from an optional position of a light carrier or select desired wavelength components to radiate them, by arranging a light diffusing layer forming a concave lens on the surface of the light carrier. CONSTITUTION:A concave lens-shaped light diffusing layer 3 consisting of an epoxy resin or the like which has a refractive index different from that of a light carrier 2 is formed on the surface of the light carrier 2. The light propagated in the light carrier 2 is diffused effectively through the light diffusing layer 3 and is radiated. The light diffusing layer 3 is formed with multilayered films 3a and 3b having different refractive indexes n1 and n2. In case that visible rays are made incident from a light source 1, infrared rays are reflected by the diffusing layer 3a, and ultraviolet rays are intercepted by the diffusing layer 3b, and only visible rays are taken out.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a light diffusing device that effectively diffuses and emits light propagated within a light carrier outside the light carrier. ,acrylic resin,
So-called plastic optical fibers made of a polycarbonate resin layer, or thin tubes, flat plates, etc. made of these materials are known as light carriers, and are used to transmit light transmitted through the above-mentioned light carriers. When used as illumination light, 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 light diffusing device that can effectively diffuse and emit light from a light carrier in the above-mentioned cases.

FIG. 1 is a configuration diagram for explaining an embodiment of a light diffusion device according to the present invention, in which 1 is a light source, 2 is a light carrier,
The light source 1 can be, for example, a normal light bulb, a warning light, a laser beam, an LED, or the light output end of a light guide fiber, but in the present invention, any desired source can be used. Is possible. The surface of the light carrier 2 has a refractive index n of the light carrier. A light diffusing layer 3 having a different refractive index, for example an epoxy resin layer, is provided, and its refractive index n□ is nl /n with respect to the refractive index nQ of the light carrier.
o = approximately 0.87 to 1.3. Therefore, the light propagated within the light carrier 2 is emitted to the outside of the light carrier 2 through the light diffusing layer 3, but at this time, the light diffusing layer is formed into a concave lens shape as shown in the figure. By doing so, you can diffuse and emit light more effectively. In that case, by appropriately selecting the refractive index of the light diffuser 3, it is possible to select and emit light of any desired wavelength. Figure 2 shows another embodiment of the present invention. This is a configuration diagram for explaining the structure.As shown in the figure, the light diffusion layer is multilayered (in the case of the illustrated example, 3a
, 3b), and the optical refractive index of each layer is nl, n2
The wavelength of the light emitted from the light diffusion layer 3 is selected by making the wavelengths different from each other. For example, when visible light is incident from the light source 1, the wavelength of the light emitted from the light diffusion layer 3a is
Reflects the heat ray R at 3b, and emits ultraviolet light at 3b! ■ Light that has been blocked can be taken out. Note that when the light diffusing section is disposed only on one side of the light carrier, a reflective surface layer 4 is provided on the side of the light carrier where the light diffusing section is not disposed, as shown in the figure.
It is easy to understand that if the light rays from the light source 1 are parallel rays, a reflective surface layer 4' may be provided on the end surface of the light carrier 20. , is a diagram for explaining an example of forming the concave lens-shaped light diffusing section shown in FIG.
For example, an appropriate amount of resin 3a having a refractive index of lnl is applied on the resin 3a and cured, and then an appropriate amount of resin 3b having a refractive index of n2 is applied thereon and cured. If separated, 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 on the surface of the light carrier 20. Incidentally, in order to form the concave lens-shaped diffusion section shown in FIG. 1, an appropriate amount of one type of resin may be placed in the opposite direction of the masking film, and the resin may be cured.

As is clear from the above description, according to the present invention, light can be effectively diffused and emitted from any desired position on a light carrier, and furthermore, only light components of a desired wavelength can be selected. can be released by

[Brief explanation of the drawing]

FIGS. 1 and 2 are block diagrams for explaining an example of a light diffusion device according to the present invention, and FIG. 3 is a diagram for explaining an example of a method for forming a light spreading section. 1... Light source, 2... Light carrier, 3.3a, 3b...
Light diffuser, 4.4'... Reflective surface layer, 5... Masking film O Figure l Figure 2 Figure 3

Claims (2)

[Claims] (1) Consisting of 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, the light diffusing layer forming a concave lens. A light diffusion device characterized by: (2) The light diffusing layer is composed of a plurality of layers, and each layer has a different refractive index.
The light diffusion device according to item 1).