Absolute encoder utilizing light of different wavelengths to...

Details Absolute encoder utilizing light of different wavelengths to... Absolute encoder utilizing light of different wavelengths to...

2006-02-16

2008-12-16

Le, Que T. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S231160

Reexamination Certificate

active

07465917

ABSTRACT:
An encoder having a code scale, an illumination system, and a plurality of photodetectors is disclosed. The code scale has a plurality of tracks that are illuminated by the illumination system. Each photodetector receives light from a corresponding one of the tracks and generates a signal indicative of a quantity of light received from that track. Each photodetector is limited to detecting light in a band of wavelengths corresponding to that track. Each track generates light in a band of wavelengths corresponding to that track, and the band of wavelengths corresponding to one of the tracks is different from the band of wavelengths corresponding to the tracks that are next to that track. The tracks can include alternating reflective and absorptive stripes, alternating transmissive and reflective stripes, or alternating luminescent and absorptive stripes.

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patent: 6194709 (2001-02-01), Briggs et al.
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patent: 2005/0230608 (2005-10-01), Okada
patent: 2005/0236560 (2005-10-01), Ch'ng et al.

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