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:
Dec. 03, 2013
Filed:
Nov. 22, 2011
Applicants:
Tetsuya Nishio, Kawasaki, JP;
Rentaro Imai, Yokohama, JP;
Inventors:
Tetsuya Nishio, Kawasaki, JP;
Rentaro Imai, Yokohama, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03B 9/08 (2006.01);
U.S. Cl.
CPC ...
Abstract
When a blade drive spring has been overcharged when a second cam gear has caused a drive lever to move to a position beyond a position of attraction of an armature by a yoke, a blade lever does not contact the drive lever even if the blade lever has been driven in a direction of opening an aperture by a first blade and a second blade with an urging force of a blade return spring. When the second cam gear has moved to the attraction position form the overcharged position, the blade lever contacts the drive lever before the yoke starts attracting the armature by the attractive force.