| 摘要 |
PURPOSE:To uniform a projection light spot, to attain stabilization to disturbing light, and to improve stability to the distance variation of a projection and a photodetection system by providing a slanting wall which the internal diameter increases outward gradually and setting the tilt angle of the slanting wall smaller than the aperture angle of an optical fiber. CONSTITUTION:An optical fiber insertion hole 6 into which an end part of the optical fiber 1 is inserted is formed in a head 3 coupled with the optical fiber 1 from one end of the head to its intermediate part, an optical guide hole 8 which has the slanting wall 7 increasing in its internal diameter gradually is formed from the intermediate part of the head 3 to its other end coaxially with the optical fiber insertion hole 6, and the tilt angle of the optical guide hole 8 is set smaller than the aperture angle of the optical fiber, thereby obtained the uniform projection light spot when the optical fiber is applied to the projection system. When the optical fiber is applied to the photodetection system, on the other hand, disturbing light can be removed and when the optical fiber is applied to the projection system, the stability to the distance variation can be improved. |
