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:
Jun. 24, 2014
Filed:
Jan. 18, 2011
Takashi Fukuhara, Tokyo, JP;
Takashi Fukuhara, Tokyo, JP;
Canon Kabushiki Kaisha, , JP;
Abstract
A displacement measuring apparatuswhich measures a displacement amount of a moving objectincludes a light source that irradiates the moving objectusing luminous flux emitted from a light emitting area, a photo diode arraythat includes a plurality of light receiving areas in a movement direction of the moving objectand that forms an image of the luminous flux reflected on a plurality of indentationsof the moving objectto receive light, and a measurement unit that measures the displacement amount of the moving objectbased on a movement amount of a light emitting area imagethat is formed on the photo diode arrayby forming the image of the luminous flux.