Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Koji Kawaguchi0
Date of Patent
January 6, 2009
Patent Application Number
11148338
Date Filed
June 9, 2005
Patent Primary Examiner
Patent 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.
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