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. 29, 1995
Filed:
Aug. 02, 1994
Kouichi Ueda, Kanagawa, JP;
Masamichi Toyama, Tokyo, JP;
Hirofumi Suda, Kanagawa, JP;
Naoya Kaneda, Kanagawa, JP;
Youichi Iwasaki, Kanagawa, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A focus detecting system for effecting automatic focusing by detecting the in-focus position of a focusing lens and driving the focusing lens to this position. This system has a signal processing means supplied with a video signal from image pick-up means to output a signal related to the in-focus state, a detection means for detecting the position of a focusing lens for forming an image in the image pick-up means, when the signal output from the signal processing means is processed, and a calculating means for calculating the presupposed in-focus position of the focusing lens from at least two groups of items of data on the signal outputted from the signal processing means and on the position of the focusing lens supplied from the detection means. Each time the deviation of the present position of the focusing lens from the presupposed in-focus position is calculated, the focusing lens is driven to move to an extent smaller than the deviation, thus being focused.