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:
Aug. 23, 2011
Filed:
Apr. 29, 2009
Nobuyoshi Kishida, Musashino, JP;
Tomoyuki Iwanaga, Yokohama, JP;
Hideyuki Ohban, Kawaguchi, JP;
Shinya Tanaka, Tokyo, JP;
Nobuyoshi Kishida, Musashino, JP;
Tomoyuki Iwanaga, Yokohama, JP;
Hideyuki Ohban, Kawaguchi, JP;
Shinya Tanaka, Tokyo, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A fundus camera includes a fundus photographing optical system including an image-recording image sensor for photographing a fundus image via a focusing lens, a focus target having a plurality of regions for forming light fluxes passing through a plurality of different areas on pupil of a subject's eye, and a focus drive unit for driving the focusing lens based on positions of a plurality of images of the focus target in an image captured by the image-recording image sensor and on contrast of the images.