| 摘要 |
PURPOSE:To form a spherical surface of good quality having an optional radius of curvature in a very short time by fusing a projected part of a sleeve, which is projected to an aperture part and to which a fiber is inserted, by heating. CONSTITUTION:A sleeve 21 is fitted to a sleeve guide 12, and its front end part is projected a length (h) to an aperture part 11. The front end part of a fiber 22 coincides with that of the sleeve 21, and a coating 23 coating the fiber 22 is in a fiber guide 13. A heat shielding plate 30 is provided which covers a part other than the aperture part 11 of a ferrule to prevent this part from being heated by a microtorch 35. The sleeve 21 and the fiber 22 consist of materials having the same melting point practically such as a quartz; and when they are heated by the microtorch 35, they are fused and a spherical surface 29 is formed by the surface tension after fusion. The length (h) by which front end parts of the sleeve 21 and the fiber 22 are projected from the aperture part is changed to set the radius of curvature of the spherical surface 29 to an optional value. |
