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. 11, 2019
Filed:
Jun. 08, 2017
Canon Kabushiki Kaisha, Tokyo, JP;
Kengo Takeuchi, Kawasaki, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
The focus detection apparatus includes circuitry which function as a producer configured to acquire paired phase difference image signals that are produced through photoelectric conversion of an object image formed by an optical system including a focus lens and that have therebetween a phase difference corresponding to a focus state of the object image, and configured to produce focus detection information using the phase difference acquired from the paired phase difference image signals, and an acquirer configured to acquire a feature value relating to a correlation value between the paired phase difference image signals. The producer is configured to acquire the phase difference depending on a result of comparison between the feature values acquired before and after driving of the focus lens.