Projection optical unit, projection-type image displaying...

Details Projection optical unit, projection-type image displaying... Projection optical unit, projection-type image displaying...

2010-07-19

2010-12-28

Pyo, Kevin (Department: 2878)

Optics: image projectors

Distortion compensation

For projection axis inclined to screen

C353S069000, C353S077000, C353S101000, C359S649000, C359S449000, C359S813000, C359S823000

Reexamination Certificate

active

07857462

ABSTRACT:
A projection optical unit for a projection display apparatus, which displays an image upon a projection surface, obliquely, includes a front lens group disposed in a direction from an image display element to a projection surface, a rear lens group, and a reflection mirror formed so that a curvature of a portion for reflecting a light beam incident upon a lower end portion of the projection surface is larger than a curvature of a portion for reflecting a light beam incident upon an upper end of the projection surface. An optical axis of the front lens group and the rear lens group is more inclined with respect to a direction of the portion of the reflection mirror for reflecting the light beam incident upon the lower end portion of the projection surface than a normal line direction of the image display element.

REFERENCES:
patent: 2008/0100927 (2008-05-01), Hisada et al.
patent: 2009/0115975 (2009-05-01), Ogura
patent: 5-134213 (1993-05-01), None
patent: 2000-162544 (2000-06-01), None
patent: 2004-157560 (2004-06-01), None

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