Photoelectric encoder

Details Photoelectric encoder Photoelectric encoder

2007-06-26

2009-06-30

Lee, John R (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S23700G

Reexamination Certificate

active

07554078

ABSTRACT:
A photoelectric encoder using a lens array for dividing an image of a scale pattern into a plurality of regions to be detected and focusing them onto an array of light receiving elements, comprises, between the scale pattern and the lens array, a light-shielding array for reducing the effect of external disturbance light. The light-shielding array may be formed as a thin film pattern on a lens array side of a transparent cover glass which provides internal protection.

REFERENCES:
patent: 7186969 (2007-03-01), Shimomura et al.
patent: 7265338 (2007-09-01), Kiriyama et al.
patent: 7307789 (2007-12-01), Mizutani
patent: 2003/0002162 (2003-01-01), Hira
patent: 2004/0173737 (2004-09-01), Shimomura et al.
patent: 2006/0056034 (2006-03-01), Tsuruma
patent: 2006/0139758 (2006-06-01), Segawa et al.
patent: 2006/0202112 (2006-09-01), Mizutani
patent: 2007/0018084 (2007-01-01), Shimomura et al.
patent: 2007/0187583 (2007-08-01), Yaku et al.
patent: 2008/0121788 (2008-05-01), Kawada
patent: A 57-8502 (1982-01-01), None

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