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:
Feb. 18, 2014
Filed:
Nov. 04, 2009
Yoshitaka Hashimoto, Yokohama, JP;
Akihiko Nagano, Ichihara, JP;
Yoshitaka Hashimoto, Yokohama, JP;
Akihiko Nagano, Ichihara, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A focus detection apparatus includes: an image sensor that has a first pixel group which receives a luminous flux passing a first pupil area of an imaging optical system, and a second pixel group which receives a luminous flux passing a second pupil area different from the first pupil area; a storage unit that stores first and second distribution functions corresponding to the first and second pupil areas, respectively; a calculation unit that generates a first image signal by performing calculations on a first subject image, obtained from the first pixel group, using the second distribution function, and generates a second image signal by performing calculations on a second subject image, obtained from the second pixel group, using the first distribution function; and a focus state detection unit that detects a focus state of the imaging optical system based on the first and the second image signals.