| 摘要 |
PURPOSE:To obtain a convex curved surface in a short period of time by forming a part larger in diameter in a fiber to the end part of an optical fiber and cutting the large-diameter part. CONSTITUTION:The end part of the optical fiber 11 is formed by heating and loading to the part 12 larger in diameter than the fiber 11. The large-diameter part 12 and the optical fiber 11 are respectively held and are cut by exerting tension between the same. The cutting is executed at the boundary between the fiber 11 and the large-diameter part 12 and the cut face of the fiber of this time is the convex curved surface 14. The max. stress face at the cutting start point is inclined theta with the face perpendicular to the axis by the effect of the part 12 formed to the diameter larger than the diameter of the fiber 11 and, therefore, the initial crank progresses at the angle theta. The theta approaches zero on progression of the rapture process and is decreased nearly zero in the second half of the rupture process. The rupture is finally completed at theta=0 and, therefore, the convex spherical face 14 is obtd. |
