Optical encoder with integrated monitor

Details Optical encoder with integrated monitor Optical encoder with integrated monitor

2005-02-25

2011-11-29

Lauture, Joseph (Department: 2819)

Coded data generation or conversion

Digital pattern reading type converter

Optical

C341S011000

Reexamination Certificate

active

08068040

ABSTRACT:
A sensor head for sensing light modulated by a moveable member, such as a code wheel or code strip, in an optical encoder. The sensor head has at least one monitor optical sensor and a primary optical sensor positioned to receive light modulated by a modulation track on the moveable member. The monitor optical sensor provides a monitor signal that is compared in a signal comparator to the output from the primary optical sensor to detect light at the primary sensor.

REFERENCES:
patent: 4920259 (1990-04-01), Epstein
patent: 4956796 (1990-09-01), Rogers et al.
patent: 5017776 (1991-05-01), Loewen
patent: 6992757 (2006-01-01), Holcomb et al.
patent: 2004/0036017 (2004-02-01), Ito

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