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. 28, 2009
Filed:
Oct. 07, 2005
Naoto Nakahara, Saitama, JP;
Naoto Nakahara, Saitama, JP;
Hoya Corporation, Tokyo, JP;
Abstract
A focus detection method, for detecting a focus state of an object image in accordance with a contrast of the object image which is formed in a focus detection area, includes capturing the object images while moving a focusing lens group of a photographing lens stepwise within a predetermined range of movement thereof; determining contrast values of the plurality of object images in the focus detection area; and setting a position of the focusing lens group as an in-focus position when a contrast value, attained when the focusing lens group is positioned at one of the closest focus position and the infinite-focus position or at a position within a predetermined range of steps from the one of the closest focus position and the infinite-focus position toward the other of the closest focus position and the infinite-focus position, is at a maximum contrast value.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile