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. 26, 2012
Filed:
Apr. 28, 2010
Katsumi Karasawa, Utsunomiya, JP;
Katsumi Karasawa, Utsunomiya, JP;
Canon Kabushiki Kaisha, , JP;
Abstract
An automatic focusing apparatus includes: plural focus detection units detecting focus states in plural areas independently; a unit measuring detection time of the focus detection units; a unit calculating a maximum focus detection time; a unit calculating defocus amounts based on outputs from the focus detection units; a unit driving a focus lens based on the defocus amounts; and a unit calculating an object predicted position. When the focus detection time exceeds the maximum focus detection time, all detections by the focus detection units are completed, defocus amounts corresponding to the respective plural areas are calculated based on the focus states in the areas detected by the focus detection units, and the focus lens is driven according to an output of the focus detection unit corresponding to a focus target position where a difference between the focus target position and the object predicted position is within an allowable range.