| 摘要 |
PURPOSE:To easily form an image fiber having an excellent contrast, by forming a recessed part by digging the clad of optical fibers exposed at one end face and removing the clad after the recessed part is filled with an opaque material. CONSTITUTION:A recessed part 7 of prescribed dimensions is formed by etching the clad 4, 4,... of optical fibers 2, 2,... exposed at one end face 5 of an image fiber 5 and the recessed part 7 is filled up with an opaque material 8. A synthetic resin, such as epoxy resin, etc., mixed with carbon powder, and other, whose light transmittance is low even if the thickness is thin and adhesiveness to glass is excellent, is used as the opaque material 8. Therefore, the opaque material filling the recessed part on the incident side prevents the incidence of light to the clad and the opaque material filling the recessed part on the emissive side prevents the emission of a clad mode. Thus the clad mode is eliminated and an optical image having an excellent contrast can be transmitted.
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