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:
May. 27, 2003
Filed:
Jan. 31, 2001
Hiroshi Nomura, Saitama, JP;
Nobuaki Aoki, Tokyo, JP;
Yoshihiro Yamazaki, Saitama, JP;
Satoru Nakamura, Tokyo, JP;
Pentax Corporation, Tokyo, JP;
Abstract
A zoom lens includes a cam barrel having bottomed cam grooves formed on an inner peripheral surface thereof, a lens frame guided in an optical axis direction, cam followers, and resilient supports which are resiliently deformable radially. Each bottomed cam groove includes a zoom section, and an accommodation section. Each bottomed cam groove is formed so that a depth of the accommodation section is greater than the zoom section. The resilient bias of each resilient support causes the cam followers to be biased against the bottomed cam grooves wherein the follower pins are fitted in the bottomed cam grooves so that no play occurs when the bottomed cam grooves are in the zoom section. Each resilient support is free from being elastically deformed so that the cam followers are inserted in the bottomed cam grooves with a predetermined amount of play when the bottomed cam grooves are positioned in the accommodation section.