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:
Dec. 15, 1992
Filed:
May. 22, 1991
Victor Company of Japan, Ltd., Yokohama, JP;
Abstract
A drive apparatus for driving an optical system of a camera in directions along an optical axis of the optical system through an electric motor. The drive apparatus is equipped with a manual ring provided in a housing of the optical system so as to be manually rotatable about the optical axis of the optical system. The manual ring is fixedly secured to a rotatable plate having a plurality of tooth portions. Also included in the drive apparatus is a rotation detector arranged to be associated with the plurality of tooth portions of the rotatable plate so as to detect the rotation of the manual ring to output a detection signal indicative of the rotation information of the manual ring. A control section is responsive to the detection signal from the rotation detector so as to output a control signal to the electric motor so that the optical system is driven at a speed corresponding to the frequency of the detection signal therefrom. This arrangement allows high-accurate position control of the optical system of the camera at a speed proportional to the rotational speed of the manual ring.