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:
Sep. 19, 2017
Filed:
Apr. 30, 2015
Canon Kabushiki Kaisha, Tokyo, JP;
Chihiro Nagura, Yokohama, JP;
CANON KABUSHIKI KAISHA, Tokyo, JP;
Abstract
The encoder includes a scale and a sensor relatively movable in a first direction. The sensor includes first and second readers reading a first pattern. The encoder acquires a first position in a first direction by using an output signal from the first reader and acquires a second position in the first direction by using an output signal from the second reader. The encoder acquires a period of the first pattern by using the first and second positions, and acquires first and second shift amounts between the scale and the first and second readers in a second direction orthogonal to the first direction. The encoder produces position information by using the first and second positions, the period and the first and second shift amounts.