JPH0621882B2 - Optical fiber side leak light treatment device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to an apparatus suitable for roughening a surface of an optical fiber, particularly a side surface of an optical fiber tape, so that light is uniformly leaked.

[Conventional technology]

Conventionally, technology has been developed to illuminate equipment that is installed in a narrow, dark place such as an instrument panel.
A combination of an acrylic resin plate and a small lighting lamp has been mainly used, but this lighting device has large illumination spots and the display on the display surface of the instrument panel is difficult to read, and the heat of the light source lamp causes the temperature on the display surface to change. There was a difficulty that it was easy to rise.

As an illumination device without such a difficulty, there is a method of using a flexible light emitting tape which is a side face of an optical fiber tape and is connected to a light source at the end face of the optical fiber tape to emit light from the light leaking part to serve as a light source. Practical application Sho 60-100497
No. 60-100498.

[Problems to be solved by the invention]

The light emitting tape having good flexibility as described above is generally produced by a device as shown in FIG. That is, the cushion (25) is placed on the plate (26) in the figure, and the optical fiber tape (24) and the emery paper (23) are placed.
Place the stamper (2
By pressing 1), the side surface of the optical fiber tape is scratched and light leakage is treated.

As shown in FIG. 3, when the light source (33) is coupled to one end of the side light leak tape (31) obtained by such a method and the brightness of the light leaked from the side light leak part (32) is measured. As shown in FIG. 3 (B), there is a tendency that the brightness of the light leak part near the light source is high and the brightness of the light leak part far from the light source is gradually lowered. Also, as shown in FIG. 4 (A), both ends of the optical fiber tape (31) are connected to the light sources (33) and (34), and the brightness of the light emitted from the light leaking part (32) is measured. Four
As shown in Fig. (B), the phenomenon that the brightness of the light leak part near both light sources is high and the brightness of the central part is low is recognized. It turns out that

[Means for solving problems]

Therefore, the inventors of the present invention are currently investigating for the purpose of developing an optical fiber side surface leakage processing device capable of obtaining a light emitting tape which is less likely to cause the above-mentioned inconvenience, and the shape of the cushion (25) shown in FIG. The present invention has been completed by finding that the object can be achieved by specifying

The gist of the present invention is that a hot stamper (21),
It consists of emery paper (23), cushion material (25), cushion mounting plate (26), and is inclined from one end to the other end as cushion material as shown in FIGS. 1 (A) to (D). There is provided an optical fiber side surface light leakage processing device characterized by using a structure having a structure or a structure having an inclined structure from both ends thereof toward a central portion thereof.

The present invention will be described in more detail with reference to the drawings. In Fig. 4
(A) and (B) is an example of a cushion material having an inclined structure from both ends toward the center, (A) is a step structure, (B) is an example of an elliptical shape Is. Both ends of a light emitting fiber tape (11), which has been subjected to side light leakage treatment by using FIG.
FIG. 1 (E) shows the result of measuring the luminance of the light leaked from the light leak processing section (12) after being coupled to (14). It is inferior that the light leakage portion of the emitted light fiber tape has extremely high brightness.
The depth of the scratches in this light leakage processing part is shallow at both light leakage processing ends,
This effect is obtained because the depth is deeper toward the center.

Next, as a cushion material, as shown in FIG. 1 (C) or (D),
A case where the optical fiber tape is processed by using the inclined structure from one end to the other end will be described. In the figure, (C) shows a structure in which the cushion material increases or decreases stepwise from one end to the other end, and (D) shows a structure in which the cushion material increases or decreases linearly from one end to the other end. is there. One end of a light emitting fiber (11) made of a cushion material having such a structure is coupled to a light source (13), and the brightness of light leaked from the light leak processing section (12) is distributed along the length direction. The measured results are shown in Fig. 1 (F). It can be seen that the brightness of the light emitted from the light leakage portion is relatively uniform.

The brightness of the light emitted from the light leakage processing part of the light emitting tape obtained by subjecting the optical fiber to the side light leakage processing using the device of the present invention should be substantially the same across the entire light leakage processing part. When used as the light source of the instrument panel, it can be used as a good light source without emission spots.

[Brief description of drawings]

FIGS. 1 (A) to 1 (D) are views showing the cross-sectional shape of the cushion material used in the present invention. In the same figure, (E) and (F) are the light leakage parts of the light emitting tape obtained by the device of the present invention. FIG. 2 is a diagram in which the luminance of the light emitted from the device is measured, FIG. 2 is a diagram showing the outline of the optical fiber leak processing device, and FIGS. 3 and 4 are the leaks of the emitted optical fiber tape obtained by the conventional method. It is the figure which measured the brightness | luminance of the light radiated | emitted from the process part.

Front page continuation (72) Inventor Kiyo Ichimura 3816 Noborito, Tama-ku, Kawasaki, Kanagawa Prefecture, Tokyo Research Laboratory, Mitsubishi Rayon Co., Ltd. In-house (72) Inventor Shigeru Inai 2-3-19 Kyobashi, Chuo-ku, Tokyo Inside Mitsubishi Rayon Co., Ltd.

Claims (1)

[Claims] 1. An optical fiber roughening device comprising a hot stamper, an emery paper, a cushion material and a cushion material mounting plate, wherein the cushion material is inclined from one end to the other end or from both ends to the central part. An optical fiber side surface light leakage treatment device characterized by using a cushioning material having a structure.