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:
Sep. 15, 1992
Filed:
Feb. 06, 1991
Applicant:
Inventors:
Assignee:
Asahi Kogaku Kogyo Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03B / ;
U.S. Cl.
CPC ...
3541951 ;
Abstract
A motor-driven zoom lens barrel including a zoom motor, a powered zooming mechanism which varies the focal length of a taking lens in accordance with the rotation of the zoom motor in the forward and reverse directions, a zoom operation ring which can be rotated, a rotational direction control circuit for rotating the zoom motor in the forward and reverse directions in accordance with the rotation of the zoom operation ring in the forward and reverse directions from a neutral position thereof, and a speed control circuit for controlling the rotational speed of the zoom motor in accordance with the angular displacement of the zoom operation ring from the neutral position.