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. 27, 2013
Filed:
Jan. 20, 2011
Seiji Iida, Yokohama, JP;
Seiji Iida, Yokohama, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
For a lens barrel that restricts the rectilinear of a lens group using a restricting portion such as a rectilinear key, the light-shielding property for external light, the degree of freedom of design relating to the arrangement of the interlocking section for a cam ring, as well as a change in the relative distance between a front group and a rear group are increased. A lens barrel has a first group (front group)and a second group (rear group)that are movable in the optical axis direction. The first group cam ringis cam-engaged with and held by the holding member (the first group barrel) of the first group, and the second group cam ringis cam-engaged with and held by the holding member (the second group barrel) of the second group. The moving cam ringguides the first group cam ringand the second group cam ring, and the fixed tubeis cam-engaged with the moving cam ringto thereby rotatably support it. The front group and the rear group are cam-engaged with and held by different cam rings. The front group and the rear group are held and guided by the moving cam ring