Photodetector array arrangement for optical encoders

Details Photodetector array arrangement for optical encoders Photodetector array arrangement for optical encoders

2006-10-24

2006-10-24

Pyo, Kevin (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S231180, C341S009000

Reexamination Certificate

active

07126108

ABSTRACT:
An optical encoder utilizes a photodetector array having at least two photodetectors with different surface areas that generate different amounts of photocurrent when they are simultaneously lit by an LED. Because the photodetectors generate different amounts of photocurrent when simultaneously lit, the photodetectors produce unambiguous results that can be used to index a coding element such as a codewheel. Another optical encoder utilizes one index photodetector that is aligned with an index track and another index photodetector that is aligned with a position track of a coding element to index the coding element.

REFERENCES:
patent: 4451731 (1984-05-01), Leonard
patent: 4691101 (1987-09-01), Leonard
patent: 5241172 (1993-08-01), Lugaresi
patent: 6797940 (2004-09-01), Steegmueller et al.

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