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. 13, 2016
Filed:
Aug. 12, 2013
Canon Kabushiki Kaisha, Tokyo, JP;
Ryo Sasaki, Utsunomiya, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A position detector configured to detect a position of an object to be detected. The position detector has an optical system configured to detect a mark on the object to be detected that includes a lens that has a positive refractive power, and a reflection member configured to reflect a light flux that passes through the lens in a convergent state or a divergent state. The reflection member is configured from at least one material of a material that exhibits a refractive index of less than 1.0 and an extinction coefficient of greater than 0.0, and a material that exhibits a refractive index of greater than 1.0 and an extinction coefficient of greater than 0.5.