Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
October 27, 2009
Patent Application Number
11809861
Date Filed
June 1, 2007
Patent Primary Examiner
Patent abstract
There is provided a projection lens for a projector which utilizes a reflection type display device, comprising a movable aperture 70 which is movable as a movable lens components moves, wherein an opening 75 in the movable aperture 70 is formed into a circular shape which is centered at the center of an optical axis 69 of the projection lens and has a swollen portion 73 on part of the opening 75 in such a manner as to project from a circumferential portion in a direction of the center of a beam of stray light into the interior of the opening 75.
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