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. 04, 2000
Filed:
Feb. 01, 1999
Yoshiharu Shiokama, Chiba-ken, JP;
Nikon Corporation, Tokyo, JP;
Abstract
An autofocus system and photographic lens to convert a residual defocus amount which is corrected on the camera body side into an appropriate residual drive amount on the photographic lens side. The autofocus system includes, on the camera body side, a focus detection device to detect a defocus amount of a photographic lens, a lens movement information acquisition device to acquire lens movement information, a within-camera correction device to determine a residual defocus amount, correcting the lens movement after focus detection based on relational information representing a relationship between the defocus amount and the lens drive amount and movement information, and an information transmission device to transmit the residual defocus amount to the lens side. The autofocus system also includes, on the lens side, a within-lens conversion device to convert the residual defocus amount into a residual drive amount using the coefficient information used by the within-camera correction device, and a lens drive device to drive the lens according to the residual drive amount.