Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Akira Yamagishi0
Date of Patent
November 11, 2008
0Patent Application Number
112990420
Date Filed
December 9, 2005
0Patent Primary Examiner
Patent abstract
An optical system that projects projection light from an image generating device, onto a screen is provided. The optical system comprises: a lens system on which the projection light from the image generating device is incident; and an aspherical mirror with negative power as a whole that is disposed on an optical path between the lens system and the screen, wherein a curvature of the aspherical mirror in the radial direction changes positive to negative on a way from a center to a periphery thereof.
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