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. 12, 1996
Filed:
Oct. 23, 1995
Akira Ogasawara, Kawasaki, JP;
Nikon Corporation, Tokyo, JP;
Abstract
An auto-focusing device for stably driving a photographing lens to track a moving object comprises a charge accumulation type photo-electric conversion device for accumulating charges at a predetermined time interval to produce a focus detection signal, a defocus amount calculation device for calculating a defocus amount of the photographing lens based on the focus detection signal, a drive distance calculation device for calculating a direction and a distance of the lens drive for driving the photographing lens to track the moving object based on at least the defocus amount, a drive device for driving the photographing lens in accordance with the calculated direction and distance of the lens drive, and a control device for supplying the direction and distance of the lens drive calculated by the drive distance calculation device to the drive device after the end of the next charge accumulation by the photo-electric conversion device to drive the photographing lens so that the photographing lens tracks the moving object.