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:
Jul. 24, 2012
Filed:
Aug. 03, 2010
Koji Uchida, Utsunomiya, JP;
Satoshi Aikawa, Yokohama, JP;
Yasuhiro Dobashi, Matsudo, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A fundus camera includes an illumination optical system that projects a ring-shaped illumination light on a pupil of a subject's eye, an imaging optical system that forms a fundus image of the illumination light on an imaging plane, and an index projection unit that projects an operation distance index on a cornea of the subject's eye. An imaging unit captures a reflection image from the fundus and a reflection image of the operation distance index, a driving unit moves the operation distance index in an optical axis direction, an index shape recognition unit recognizes an index shape projected on the cornea according to a movement of a light emitting surface of the index projection unit by the driving unit, and a detection unit detects operation distances of the illumination optical system and the imaging optical system with respect to the subject's eye.