Optical rotary encoder device

摘要: An encoder device having a rotating plate (6) provided with plurality of light transmission areas (61) and shielding (62), first optical fiber cable (7, 8) for guiding from emitting element (33a, 33b) at one side the rotation so as to illuminate areas, second third cables (9, 10), other plate, receiving transmitted through area via predetermined slit (4a), being obtain reception signals phase difference therebetween. The can have signal processing circuit which generates rotational position in an absolute mode when incorporating incremental type mechanism section.