Phase-shift photoelectric encoder

Details Phase-shift photoelectric encoder Phase-shift photoelectric encoder

2005-10-18

2005-10-18

Porta, David (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S214100, C341S011000

Reexamination Certificate

active

06956200

ABSTRACT:
A scale generates a periodic light-intensity distribution pattern having a pitch upon irradiation by emission light from a light source. Light-detecting element groups are shifted relative to the scale to generate phase signals having fixed phase differences. Light-detecting elements are adjacently positioned to have the same phase to form each light-detecting element group. Area centers of gravity on a phase axis of the light-detecting element groups having a fixed phase difference are made coincident with each other.

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patent: 5981942 (1999-11-01), Ieki
patent: 6410911 (2002-06-01), Omi
patent: 6610975 (2003-08-01), Ito et al.
patent: 6794637 (2004-09-01), Holzapfel et al.
patent: 2002/0018220 (2002-02-01), Aoki
patent: 8-201117 (1996-08-01), None
patent: 2002-236033 (2002-08-01), None

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