JPS58214107A - Optical radiator - Google Patents

Abstract

PURPOSE:To diffuse effectively the light transmitted within a columnar photoconductor, by forming a conical part to the photoconductor to diffuse the light and then discharging the light after converting it into various types of illumination beams. CONSTITUTION:A light radiator 1 consists of a columnar photoconductor part 1a and a tapered and trapezoidal conical photoconductor part 1b. Then the focused sunbeam travels while reflected by the wall surface and is discharged through an end face B with a considerable degree of diffusion while it is reflected by the wall surface of the part 1b. In the case of the input focused light L2, the discharged light has a raindbow striped pattern and is not suited to the ordinary illumination. This discharged light, however, can be used effectively for decorative purpose. If parallel beams L1 are delivered to the face A, the light having nearly the same property as that of the delivered beams is discharged through the face B of the conductor 1.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention effectively diffuses light transmitted through a light guide cable (including optical fiber) or the like, or
The present invention relates to a light radiator that converts light into light suitable for general illumination, decorative illumination, special illumination used in laser microscopes, etc., and emits the light from the optical conductor cable.

Recently, we have entered an era of energy conservation, and research and development on the effective use of solar energy is being actively conducted in various fields. Without converting it into other forms of energy such as thermal energy or electrical energy, the light energy is bundled and introduced into a light conductor cable, transmitted through the light guide cable to any desired location, and at that location. Various proposals have already been made regarding the use of light guide cables to emit light for illumination.

Therefore, when trying to use solar energy for lighting as described above, the light propagating inside the light guide cable is directional, so it is necessary to cut the end of the light guide cable. When light is emitted from the cut point, the radiation angle is usually about 46 degrees, which is quite narrow. In this case, it is not possible to provide satisfactory illumination by simply cutting off the entire end of the optical conductor cable and emitting light from the cut point. Therefore, the present applicant has proposed various optical lanators that can effectively diffuse the light propagated within the optical conductor cable and uniformly illuminate a wide area. The present invention was also made as part of this, and in particular,
The present invention provides an optical radiator made of a cylindrical light guide, in which a conical portion is provided in the light transmission direction of the light guide, and thereby,
The light propagating through the light guide is effectively diffused or converted into light suitable for general illumination, decorative illumination, special illumination used in laser microscopes, etc. 17 and emitted from the light guide. It is something.

FIG. 1 is a diagram showing the most common case in which light propagated through a light guide is emitted from the light guide.
2 is a light guide, and as shown in the figure, when a parallel light beam L1 is introduced from one end surface A of the light guide 1, the parallel light beam L□ is emitted from the other end surface B of the light guide 1; The scattered light does not spread, so it is suitable for remote lighting such as spot lighting, but is not suitable for general lighting. Furthermore, when the focused light L2 is introduced into such a cylindrical light guide as shown in FIG. However, if the length of the light guide 1 is made long enough for practical use, a striped pattern will appear in the emitted light, making it unsuitable for general illumination. Note that if the light propagating through the conductor is a laser beam, striped patterns will occur even in very thin optical conductor cables such as optical fibers, which can be a problem when used in laser microscopes, etc. Ta.

The present invention was made in view of the above-mentioned circumstances, and
Each embodiment of the present invention will be described below with reference to the drawings. Throughout the drawings, parts having the same function (C has the same reference number).

FIG. 3 is a diagram for explaining one embodiment of the optical radiator according to the present invention. In this embodiment, the optical radiator 1 includes a cylindrical light guide section and a cylindrical light guide section following the cylindrical light guide section. It consists of a tapered truncated cone-shaped light guide part [b], and the focused sunlight introduced from the end A of the cylindrical part is reflected by the wall surfaces of the cylindrical part and the conical part, and the light guide part 1 and is emitted from the end B of the conical part 1b, but as the light travels while being reflected by the wall surface of the conical part 1b, the light N
- When A becomes large and is emitted from the conical end surface B, it is emitted with a considerable spread angle. However, if the light introduced into the light guide is a focused light as shown in figure (a), it will produce a rainbow striped pattern in the emitted light, which is not suitable for general illumination, but on the contrary, it is suitable for decoration. Its utility value as light is high.

If you want to use such a light guide for general illumination, you can introduce parallel light into the end surface A of the light guide 1, as shown in figure (b). For example, from the end surface B of the light guide 1, light of substantially the same quality as the introduced light is emitted.

FIG. 4 is a diagram for explaining another embodiment of the present invention,
In the case of FIG. ”, these light guides 1
The optical radiator 1 is configured by connecting the conical parts of 11° and 11 to each other, and in this way, the striped pattern that occurs while the light propagates inside the light guide 1' “
The light is canceled out while propagating inside the light radiator, and light without stripes is emitted from the light radiator. In addition, FIG. 4(a) shows an example in which the optical radiator 1 is constructed by connecting the optical guides 1' and 1'', and FIG. 4(b) shows an example in which the optical radiator 1 is constructed by using optical conductors made by the university. Give an example.

FIG. 5 is a diagram for explaining still another embodiment of the present invention, and the embodiment shown in FIG. A tapered conical portion 11o is provided in the light guide 1'', and as in the embodiment shown in FIG. A' is made larger and the emission angle is made larger. In FIG. Example, (b) shows an optical radiator constructed with a single optical guide 1
Here is an example.

As is clear from the above explanation, according to the present invention, darkness c.
By using this structure, it is possible to effectively diffuse the light propagating through the metal within the conductor and to emit the light having desired properties.

[Brief explanation of the drawing]

FIGS. 1 and 2 are diagrams for explaining how light propagated within a light guide is emitted from the light guide,
FIGS. 3 to 5 are diagrams for explaining embodiments of the optical radiator according to the present invention. 1... Optical radiator (light guide), 1', 11... Light guide, 1a, 1',, 1w, ..., Column-shaped part, 1b, 1
゛5.1゛5.11c...Conical part. Figure 1! Figure 2 Figure 3 Figure 4 Figure 5

Claims (3)

[Claims] (1) A light radiator comprising a light guide having a cylindrical portion and a permanently tapered truncated conical portion in the cylindrical portion. (2) from a light guide having a cylindrical portion, a tapered conical portion continuing from the cylindrical portion, a tapered conical portion continuing from the conical portion, and a cylindrical portion continuing from the conical portion; An optical radiator characterized by (3) A cylindrical part, a tapered conical part continuing from the cylindrical part, a tapered conical part continuing from the conical part, a cylindrical part continuing from the conical part, and the cylindrical part. 1. A light radiator comprising a light guide having a tapered truncated cone following a radiator.