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. 05, 2000
Filed:
Sep. 27, 1999
Futoshi Hirai, Kawasaki, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A zoom lens barrel includes a fixed tube provided at a camera body, a first rotary tube arranged to move in an optical axis direction relative to the fixed tube and rotate around the optical axis, the first rotary tube having a helical groove formed on an inner surface thereof, a first rectilinear member disposed inside the first rotary tube and arranged to rectilinearly move in the optical axis direction integrally with the first rotary tube, a second rotary tube disposed inside the first rotary tube and arranged to rotate at the same amount of rotation as that of the first rotary tube, and a second rectilinear member disposed inside the second rotary tube, having a projecting part engaging the helical groove and prevented by the first rectilinear member from rotating around the optical axis, wherein the second rectilinear member moves in the optical axis direction according to a locus of the helical groove, thereby causing the second rotary tube to move in the optical axis direction.