Photointerruptor for use in light-transmission type rotary encoder

摘要

A photointerruptor for use in a light transmission type rotary encoder comprising a photointerruptor main body having a plurality pair of light emitting and light receiving optical fibers resin-molded therein, each pair of the optical fibers being disposed such that their end faces are opposed on both sides of each code pattern formed circumferentially on a pulse scale, the light emitting optical fibers joined by way of an optical branching device into a light input end and the light receiving optical fibers being extended in parallel with each other through the photointerruptor and, an adaptor integrally formed to the photointerruptor main body and through which the light input end of the light emitting optical fibers and the light emitting ends of the light receiving optical fibers are extended and arranged such that they are collectively connected with core wires of a multi-cored transmission optical fiber cable by way of a light connector respectively.