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, 2011
Filed:
Dec. 14, 2009
Applicants:
Tatsuo Sekimoto, Kanagawa, JP;
Atsuya Ishii, Kanagawa, JP;
Ryuhei Azuma, Kanagawa, JP;
Kunioki Takahashi, Chiba, JP;
Inventors:
Tatsuo Sekimoto, Kanagawa, JP;
Atsuya Ishii, Kanagawa, JP;
Ryuhei Azuma, Kanagawa, JP;
Kunioki Takahashi, Chiba, JP;
Assignee:
Sony Corporation, , JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G03B 9/02 (2006.01);
U.S. Cl.
CPC ...
Abstract
A light quantity adjuster includes: a blade member forming an aperture; a stepping motor that moves the blade member to open/close the aperture; and a control section that controls driving of the stepping motor, and increases a rotational speed of the stepping motor after a resistance acting on the stepping motor changes from static friction to dynamical friction in case of closing the aperture.