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. 29, 1997
Filed:
Jun. 29, 1995
Shozo Yamano, Tokyo, JP;
Nikon Corp., Tokyo, JP;
Abstract
An automatic focus adjustment device is provided for focusing on a moving object with precision. The automatic focus adjustment device includes a photographic lens driver assembly to vary the forwarding amount of the phototaking lens assembly. A focus detection assembly detects the defocus amount of the subject image plane. An image plane velocity computation assembly computes the moving velocity of the subject image plane based on the defocus amount. A lens drive control assembly controls the photographic lens driver assembly based on the moving velocity of the subject image plane and the defocus amount. An adaptive controller reduces an instruction amount corresponding to the defocus amount for controlling focus adjustment when the detected defocus amount and the computed moving velocity have opposite arithmetic signs.