| 摘要 |
PURPOSE:To obtain a distinct transmission image, and to prevent an optical fiber from being broken, by using a plastic compound multi-optical fiber of a specific structure. CONSTITUTION:The titled endoscope is provided with a photodetecting use multi-optical fiber 1 for leading an image of an object to be observed 8 to a light receiving part, for instance, a still camera 4, and a light sending use optical fiber for leading a light beam from a light source 3 to the object 8 to be observed. In this case, as for the light receiving use multi-optical fiber 1, an island part of a core-sheath structure having a roughly circular cross section and an optical transmission property of 5-200mu diameter is within a range of 50-10,000 pieces in the sea part, and also, positions of the island parts placed on both the end faces of the multi-optical fiber have a relation of 1-to-1, the total area of the cross section of the core part in the cross section of the sea part occupies >=50%, and at least one piece of a plastic multi-optical fiber whose cross section outside peripheral shape is roughly rectangular is used. In such a way, a distinct image is obtained, and the optical fiber is not broken.
|
