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:
Jan. 16, 1990
Filed:
Dec. 31, 1987
Ichiro Ohnuki, Tokyo, JP;
Shinichi Matsuyama, Tokyo, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An automatic focusing device for driving a lens to the in-focus position by a motor, by driving the motor at a high speed when the lens is distanced from the in-focus position by a large amount, or at a low speed when the lens is distance from the in-focus position by a small amount. Even when the lens is distanced from the in-focus position by a large amount, the high-speed drive is not conducted if the motor has to be switched to the low speed in the course of acceleration to the high speed, in order to prevent strong shock to the user, encountered in case of such sudden change to the low speed drive.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile