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:
Feb. 04, 1997
Filed:
Jan. 25, 1995
Akira Ogasawara, Kanagawa-ken, JP;
Nikon Corporation, Tokyo, JP;
Abstract
An automatic focus adjustment device and method is used after focussing a shooting lens so as to maintain both stability and focussing precision. Shooting lens defocus amounts are calculated based on focus state detection signals repeatedly output from an electric charge type photosensitive device that receives light rays from a subject. Focus adjustment is accomplished until the shooting lens is in the predetermined focussing state based on these defocus amounts. After the shooting lens has reached the predetermined focussing state, the calculated defocus amounts are statistically processed. The determination to resume focus adjustment of the shooting lens is made based on this processing.