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US 2006/0132723 A1Published application
Optical system and rear projector
AssigneeNittoh Kogaku K.K.
InventorAkira Yamagishi
Life of this patent
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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.
Claims10
An optical system that projects projection light from an image generating device, onto a screen, the optical system comprising:
- 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.
Dependencies are inferred from the claim text.