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:
Nov. 08, 2016
Filed:
Jan. 11, 2013
Hoya Corporation, Tokyo, JP;
Takamitsu Sasaki, Saitama, JP;
HOYA CORPORATION, Tokyo, JP;
Abstract
A zoom lens barrel includes front and rear lens group support frames, a first spring member provided to bias the front lens group support frame and a diaphragm in directions away from each other, and a second spring member provided to bias the diaphragm and the rear lens group support frame in directions away from each other. Spring loads of the first and second spring members are determined such that, when the front and rear lens group support frames approach each other during zooming, one and the other of the first and second spring members are compressed and not compressed, and the other of the first and second spring members is compressed after the one of the first and second spring members is fully compressed.