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:
Jan. 06, 2009
Filed:
Jun. 09, 2005
Applicant:
Koji Kawaguchi, Saitama, JP;
Inventor:
Koji Kawaguchi, Saitama, JP;
Assignee:
Tamron Co., Ltd., Saitama-shi, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G03B 9/04 (2006.01);
U.S. Cl.
CPC ...
Abstract
A light-amount adjusting apparatus includes two aperture diaphragms that move in such a direction that the two aperture diaphragms come close or get away with respect to an optical axis of an incident light to adjust a size of an aperture opening. At least one of the two aperture diaphragms includes an optical filter having a predetermined light transmittance characteristic. The optical filter freely advances and retreats in a direction of the aperture opening in conjunction with a movement of the aperture diaphragm.