Photoelectric encoder having multiple light-receiving elements

Details Photoelectric encoder having multiple light-receiving elements Photoelectric encoder having multiple light-receiving elements

2007-02-15

2008-11-04

Luu, Thanh X (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S231140, C356S616000

Reexamination Certificate

active

07446306

ABSTRACT:
In a photoelectric encoder (incremental encoder and absolute encoder) having a detector that is displaceable relative to a scale having a predetermined pattern (incremental pattern and pseudorandom pattern) formed thereon, the detection range, to be simultaneously detected, of the pattern is divided in at least the detection direction, and a plurality of light-receiving systems are provided to detect each of the respective detection areas, whereby measurement of a wide detection range is enabled by using a small-sized and simple optical system and light-receiving system.

REFERENCES:
patent: 6486467 (2002-11-01), Speckbacher et al.
patent: 6649925 (2003-11-01), Talmi
patent: 6742275 (2004-06-01), Mayer et al.
patent: 6844542 (2005-01-01), Kirschbaum et al.
patent: 2002/0021450 (2002-02-01), Aoki
patent: 2004/0173737 (2004-09-01), Shimomura et al.
patent: 2005/0087681 (2005-04-01), Chin et al.
patent: 2006/0202112 (2006-09-01), Mizutani

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