Absolute position encoder having a second incremental track...

Details Absolute position encoder having a second incremental track... Absolute position encoder having a second incremental track...

2008-06-18

2010-02-16

Luu, Thanh X (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S231130, C341S011000, C356S617000

Reexamination Certificate

active

07663093

ABSTRACT:
A scale has a first incremental track with first incremental patterns including first light and dark patterns formed at equal intervals in first periods, an absolute track with absolute patterns representing absolute positions, and a second incremental track with second incremental patterns including second light and dark patterns formed at equal intervals in second periods longer than the first periods. A light source emits a measurement light to the scale. A photodetector receives the measurement light reflected at or transmitted through the scale. A signal processing circuit processes the received light signal of the photodetector to detect an absolute position of the scale.

REFERENCES:
patent: 4914437 (1990-04-01), Kibrick et al.
patent: 5003171 (1991-03-01), Paley
patent: 2005/0236560 (2005-10-01), Ch'ng et al.
patent: 2008/0111061 (2008-05-01), Wong et al.
patent: 07-286861 (1995-10-01), None

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