Optical position detector

摘要

An optical position detector having an excellent detection characteristic at long measurement distance is achieved by a structure including an input optical fiber, output optical fibers, a slab light guide which is disposed on a substrate and has a branched light guide, a first cylindrical lens which converts an optical path of light emerging from the slab light guide and which condenses the light on a surface to be detected, and a second cylindrical lens which converts an optical path of light reflected from the surface to be detected and which guides the light to the slab light guide.