Photosensitive diode circuit used by optical rotary encoder

Published:2011/5/2 6:05:00 Author:Nicole | Keyword: photosensitive diode, optical rotary encoder | From:SeekIC

The light which is emitted by tungsten bulb reaches photosensitive tube by lens, cylindrical lens and chromium plating optical coded disc slit. The coded disc is scribed as cyclical binary code, if it is n bits binary code, then it needs n photosensitive tubes arrangement in a straight line behind the light slit. 16 bits requires light slit with 20μm width, 15 bits requires light slit with 40μm width, it has good reliability. When it has light, the ammeter showns 0.1μA; when it has no light, it showns 6~10μA. 3DG6D*2 is composite pipe, it has larger amplification factor, it also is the emitter output. Schmitt trigger is composed of two 3DK2, its function is plastic. When it has light, the output is lower than 0.5V, when it has light, the output can reach +6V.



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