Photoelectric encoder

Details Photoelectric encoder Photoelectric encoder

2005-06-14

2005-06-14

Luu, Thanh X. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S23700G

Reexamination Certificate

active

06906311

ABSTRACT:
A photoelectric encoder includes an optical receipt chip on which the light acceptance surfaces of a plurality of photodiodes are disposed two-dimensionally. Four optical signals different in phase from one another (i.e., light signals with phase “A,” phase “B,” phase “AA,” and phase “BB”) are guided to fall onto the light acceptance surfaces. The shape of each light acceptance surface is a regular hexagon.

REFERENCES:
patent: 3937964 (1976-02-01), Muehllehner
patent: 4471387 (1984-09-01), Nadler
patent: 5956087 (1999-09-01), Takayama et al.
patent: 2004/0149919 (2004-08-01), Lechner et al.
patent: A 7-151565 (1995-06-01), None
patent: WO 01/31292 (2001-05-01), None

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