Patent ID: 6236036
Filing Date: 2001-05-22
Classification: G01V

Abstract:
A multi-optical-path photoswitch comprising:a plurality of light emitting devices for emitting a light by each of said light emitting devices;light-emission control means for generating a light-emission-timing signal for determining predetermined light emission timing;light-emitting-device driving circuits for sequentially driving said plural light emitting devices in response to said light-emission-timing signals supplied from said light-emission control means;a plurality of light receiving devices, each receiving said light emitted from said respective light emitting device;light-receipt control means for generating a light-receipt signal incoming from said plural light receiving devices in synchronization with the light-emission-timing signals;voltage detection means for detecting an operating voltage at either one of an input side or an output side of each of said light-emitting-device driving circuits; andabnormal state detection mearis for detecting abnormal operations of said plural light emitting devices in accordance with said operating voltages detected by said voltage detection means.