| 摘要 |
PURPOSE: To surely protect the core end of the light transmission tube from the external environment, to prevent the thermal influence by direct irradiation of the core of a light transmission tube with light by particularly mounting this window member at the end of a light incident side and to easily execute the attachment and detachment of a window member to and from the light transmission tube and the fixation thereof to the tube as well as the release thereof. CONSTITUTION: This window member is attachably and detachably mounted at the end of the light transmission tube formed by packing the solid core having a refractive index higher than the refractive index of the clad of a tubular clad into this clad so as to cover the end face of the core. The window member described above includes a first tubular body 1 which is inserted onto the clad and is mounted with a light transmissive window body 2 closing the aperture at the front end, a second tubular body 5 which is inserted onto the clad, a means which couple both these tubular bodies 1, 5 to each other and an O-ring 9 which is interposed between the two tubular bodies 1 and 5 and of which the inner peripheral surface comes into tight contact with the clad by plastic deformation in a radial direction when both tubular bodies 1, 5 are coupled. |
