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. 31, 2007
Filed:
Sep. 02, 2002
Masakazu Koyanagi, Chiba, JP;
Masakazu Koyanagi, Chiba, JP;
Sony Corporation, Tokyo, JP;
Abstract
An image pickup apparatus for electronically photographing a still image using a photo-voltaic transducer device. The focusing position of a focusing lens is detected from the contrast of the photographed image as AF supplementary light is illuminated on the object. The focusing lens then is moved to its focusing position and the contrast of the photographed image, in both the state where the AF supplementary light is illuminated and the contrast in the state where the AF supplementary light is not illuminated, is calculated. The contrast ratio between the contrast values of the two states is estimated and the focusing position is corrected based on this ratio.