The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 03, 2009
Filed:
Sep. 04, 2008
Norikazu Okada, Kashihara, JP;
Norikazu Okada, Kashihara, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
An optical encoder of the invention has an OR circuitto which light reception signals A+, B+ are inputted, an OR circuitto which light reception signals A−, B− are inputted, and an AND circuitto which an output signal C of the OR circuitand an output signal D of the OR circuitare 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 circuitof the signal processing circuit. Thus, the signal processing circuitdoes 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.