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. 03, 2017
Filed:
Aug. 30, 2013
Canon Kabushiki Kaisha, Tokyo, JP;
Chihiro Nagura, Yokohama, JP;
CANON KABUSHIKI KAISHA, Tokyo, JP;
Abstract
A scale () has a plurality of patterns so as to spatially modulate an energy distribution, and the scale includes a first pattern having a first modulation period in a moving direction, and a second pattern having a second modulation period different from the first modulation period in the moving direction, a relative phase between the first pattern and the second pattern changes in accordance with a direction perpendicular to the moving direction, each of the first pattern and the second pattern is configured by including a reflective portion () that reflects light and a non-reflective portion () that does not reflect the light, and a width of the reflective portion () in the moving direction at a first position is different from the width at a second position different from the first position along the direction perpendicular to the moving direction.