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:
Nov. 02, 2010
Filed:
Jun. 02, 2009
Yoshiyuki Yamada, Toyokawa, JP;
Yuji Murase, Gamagori, JP;
Mitsuo Yamamoto, Gamagori, JP;
Yukihiro Higuchi, Gamagori, JP;
Norimasa Satake, Aichi-ken, JP;
Yoshiyuki Yamada, Toyokawa, JP;
Yuji Murase, Gamagori, JP;
Mitsuo Yamamoto, Gamagori, JP;
Yukihiro Higuchi, Gamagori, JP;
Norimasa Satake, Aichi-ken, JP;
Nidek Co., Ltd., Gamagori-shi, JP;
Abstract
An ophthalmic photographing apparatus comprising a photographing optical system for obtaining a regional image of an examinee's eye, comprising a light source, a focusing optical element movable in an optical-axis direction by a driving mechanism, and a photodetector, and a control unit controlling driving of the mechanism and obtain the image based on a signal from the photodetector, wherein the control unit further moves the optical element in predetermined steps/continuously to obtain the image at each position, calculates frequency distribution of luminance of each of the images to detect a change characteristic of luminance values having frequencies equal or exceeding a threshold value in the frequency distribution with respect to the optical element position, and detects a focus position of the optical element based on the change characteristics to move the optical element to a position corresponding to the detected focus position.