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:
Aug. 17, 1999
Filed:
Dec. 10, 1997
Applicant:
Inventors:
Haruhisa Yamamoto, Fujisawa, JP;
Norio Nakai, Kawaguchi, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03B / ;
U.S. Cl.
CPC ...
396 85 ; 396131 ; 396508 ;
Abstract
A lens barrel includes an optical lens having an optical axis, an operation ring substantially cylindrical and operable about the optical axis to move the optical lens along the optical axis thereof, and a slidable contact member slidably in contact with the inner circumferential surface of the operation ring, the slidable contact member providing a specific load against the inner circumferential surface thereof. The operational torque of the operation force is changed when the slidable contact member moves in the optical axis direction by changing its contact area with the inner circumferential surface of the operation ring.