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. 18, 1989
Filed:
Feb. 04, 1988
Keiji Enomoto, Tokyo, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A variable focus lens barrel in which a variable power drive frame has a plurality of cam grooves which each receive a cam pin provided on each of movable frames to which a lens group is each fixed, the variable power drive frame being driven by a motor to perform variable power drive, wherein a balanced groove is formed at each of both ends of a variable power drive range of each of the cam grooves formed in the variable power drive frame such that the balanced groove extends circumferentially of the variable power drive frame over a predetermined angular range from each end, and wherein each of the movable frames does not move in the direction of the optical axis in a rotational area of the variable power drive frame in which each of cam pins slides in the corresponding balanced groove.