Encoder in which single light source projects dual beams onto gr

Details Encoder in which single light source projects dual beams onto gr Encoder in which single light source projects dual beams onto gr

1991-04-08

1992-05-12

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25023114, G01D 534

Patent

active

051130718

ABSTRACT:
An encoder includes a semiconductor laser capable of emitting two coherent light beams from two end faces thereof, respectively. The end faces of the semiconductor laser are arranged such that the coherent light beams intersect each other. The two coherent light beams emitted from the end faces of the semiconductor laser are incident on a scale having a plurality of gratings. The two coherent light beams are diffracted by the gratings, resulting in two diffracted light beams. The two diffracted light beams interfere with each other, and the intensity of the resultant interference light beam is detected by a detector. In response to this detection, the detector produces a signal corresponding to the intensity change which is proportional to the relative moving distance between the detector and the scale.

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