Optical encoder

Details Optical encoder Optical encoder

2007-05-15

2007-05-15

Epps, Georgia (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C341S013000

Reexamination Certificate

active

10783592

ABSTRACT:
In an optical encoder, a plurality of light sources is controlled on and off so as to use light rays to irradiate an optical grating of a scale from a plurality of different directions. The light rays are received by a plurality of photoreceptor elements. Operations are performed using signals output from the photoreceptor elements. Accordingly, the relative position between the photoreceptor elements and the scale is detected precisely.

REFERENCES:
patent: 5750983 (1998-05-01), Swanson
patent: 6093928 (2000-07-01), Ohtomo et al.
patent: 6410910 (2002-06-01), Feichtinger
patent: 2002/0000514 (2002-01-01), Haas et al.
patent: 2002/0014581 (2002-02-01), Yamamoto et al.
patent: 2003/0218125 (2003-11-01), Igaki et al.

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