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:
Feb. 23, 2016
Filed:
Sep. 10, 2013
Canon Kabushiki Kaisha, Tokyo, JP;
Ko Ishizuka, Saitama, JP;
Makiko Ogasawara, Utsunomiya, JP;
CANON KABUSHIKI KAISHA, Tokyo, JP;
Abstract
A two-dimensional absolute encoder includes a scale having marks arranged thereon along first and second directions different from each other, a detector configured to perform first detection that detects rows of a first number of marks arranged in the first direction and second detection that detects rows of a second number of marks arranged in the second direction, and a processor configured to determine absolute positions of the scale in the first and second directions based on outputs from the detector. Each of the marks has one of different characteristic values each corresponding to a combination of a quantized first code for indicating a position in the first direction and a quantized second code for indicating a position in the second direction, the number of the different characteristic values being smaller than the number of the combinations.