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:
Oct. 02, 2012
Filed:
Mar. 03, 2010
Mitsuya Sato, Yokohama, JP;
Mitsuya Sato, Yokohama, JP;
Canon Kabushiki Kaisha, , JP;
Abstract
A position detector includes a first planar encoder including a first encoder head unit mounted on a test object that is a movable member, and a first grating unit mounted on a fixed member, the first planar encoder being configured to detect a position of the test object in two directions by measuring a position of the first grating unit using the first encoder head unit, and a second planar encoder including a second encoder head unit mounted on the fixed member, and a second grating unit mounted on the movable member, the second planar encoder being used to generate data for calibrating the position of the first grating unit measured by the first encoder head unit.