SQUARE WAVE ROTARY PULSE TRANSDUCER

摘要

An electro-optical pulse generator. A disc having alternate transparent and opaque areas at its periphery is rotated between a light emitting diode (LED) and a photo-transistor to generate pulses. In order to avoid generation of spurious pulses in the event of slight rotation due to vibration or the like causing shifting across the opaque-to-transparent tripping point, gray (semi-transparent) areas are interposed on this disc between the transparent and opaque areas. These gray areas will not cause tripping and, thus, lengthen the angular distance between the high (transparent) tripping point and the low (opaque) tripping point to prevent unwanted pulses.