Optical encoder and electronic equipment having the same

Details Optical encoder and electronic equipment having the same Optical encoder and electronic equipment having the same

2008-09-04

2009-11-03

Lee, John R (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S231160, C250S231180

Reexamination Certificate

active

07612327

ABSTRACT:
An optical encoder of the invention has an OR circuit21to which light reception signals A+, B+ are inputted, an OR circuit22to which light reception signals A−, B− are inputted, and an AND circuit23to which an output signal C of the OR circuit21and an output signal D of the OR circuit22are inputted. In this optical encoder, a light reception signal A− shifted in phase by 180° from the light reception signal A+, and a light reception signal B− shifted in phase by 180° from the light reception signal B+, are inputted to the OR circuit22of the signal processing circuit15. Thus, the signal processing circuit15does not need NOT circuits for inverting the light reception signal A+ and B+. This optical encoder can avoid occurrence of phase differences due to gate delay among signals and detect the mover with signals of excellent duty and periodic precisions.

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