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:
Apr. 24, 2001
Filed:
Feb. 16, 2000
Syunji Nishimura, Saitama, JP;
Fuji Photo Optical Co., Ltd., Saitama, JP;
Abstract
In a zoom lens barrel, a driving barrel is rotated when magnification is changed. Upon this rotation, a moving barrel having a front lens group and a shutter block is moved in an optical axis direction. A straight guide barrel for preventing the moving barrel from rotating is rotatably supported in the driving barrel. Further, a cam barrel is rotatably supported in the straight guide barrel. The rotation of the driving barrel is transmitted to rotate the cam barrel. A rear-lens-group holder contained in the cam barrel is moved in the optical axis direction owing to workings of the cam barrel and the straight guide barrel. The shutter block is provided with a projection for changing a maximum aperture size of the shutter blades. An inner surface of the cam barrel is provided with a cam groove obliquely formed in a rotational direction around the optical axis. The cam groove engages with the projection when the shutter block enters the cam barrel, and regulates the maximum aperture size of the shutter blades.