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. 07, 2017
Filed:
Apr. 17, 2015
Applicant:
Canon Kabushiki Kaisha, Tokyo, JP;
Inventor:
Ko Ishizuka, Saitama, JP;
Assignee:
CANON KABUSHIKI KAISHA, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01D 5/347 (2006.01); G01D 5/244 (2006.01); G01D 5/245 (2006.01); G01D 5/249 (2006.01);
U.S. Cl.
CPC ...
G01D 5/34776 (2013.01); G01D 5/2455 (2013.01); G01D 5/2492 (2013.01); G01D 5/2495 (2013.01); G01D 5/24466 (2013.01); G01D 5/24471 (2013.01); G01D 5/24495 (2013.01); G01D 5/34715 (2013.01); G01D 5/34746 (2013.01); G01D 5/34792 (2013.01);
Abstract
There is provided an absolute encoder advantageous in accuracy of an output thereof against a defect in a scale thereof. In the absolute encoder, a detector detects a part of an array of marks of the scale, and outputs a data sequence corresponding to the part. A processor stores information indicating a correspondence between each of a plurality of code sequences and an absolute coordinate of motion of the scale, and outputs information of the absolute coordinate based on the data sequence and the information. The processor detects an error of the data sequence, and performs rewriting of the information based on the detected error.