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. 13, 2015
Filed:
Oct. 15, 2013
Canon Kabushiki Kaisha, Tokyo, JP;
Akihiko Nagano, Ichihara, JP;
CANON KABUSHIKI KAISHA, Tokyo, JP;
Abstract
A focus detection apparatus comprises: an image sensor configured to receive a plurality of beams having passed through different exit pupil regions of an imaging optical system and output a pair of image signals corresponding to the different exit pupil regions; a calculation unit configured to obtain, from the pair of image signals, a spatial frequency at which a phase difference between a pair of images is minimized, and obtain an image shift amount between the pair of image signals from the spatial frequency; and a focus control unit configured to perform focus control by a phase difference detection method based on the image shift amount obtained by the calculation unit.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile