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:
Apr. 02, 2019
Filed:
Sep. 07, 2017
Canon Kabushiki Kaisha, Tokyo, JP;
Hiroaki Kurisu, Tokyo, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A focus adjustment apparatus includes a signal generating unit configured to generate signals of two images respectively corresponding to a pair of light fluxes passing through different pupil regions of a focusing lens, a two-image displacement amount calculation unit configured to calculate a displacement amount of the two images with respect to each other based on a phase difference of the signals of the two images, a steepness calculating unit configured to calculate a steepness of change in a correlation change amount of the two images, a steepness normalization unit that normalizes the steepness, and an evaluating unit configured to evaluate reliability of the displacement amount of the two images based on the normalized steepness.