Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
August 12, 2008
Patent Application Number
11253224
Date Filed
October 18, 2005
Patent Primary Examiner
Patent abstract
A projection optical system for projecting, while enlarging, an image formed on an image formation surface onto an image projection surface from an oblique direction relative thereto has at least three optically powered reflective surfaces and a refractive lens surface having a non-rotation-symmetric free-form curved surface and disposed between the first and second reflective surfaces as counted from the image formation surface side.
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