Oblique projection optical apparatus

Details Oblique projection optical apparatus Oblique projection optical apparatus

1997-10-03

1999-09-07

Dowling, William

Optics: image projectors

Distortion compensation

For projection axis inclined to screen

353 69, G03B 2114

Patent

active

059475765

ABSTRACT:
A projection optical apparatus has a projection optical system for projecting from a primary image an enlarged or reduced secondary image. A line connecting a center of an aperture diaphragm of the projection optical system to a center of an enlargement-side image plane forms a predetermined angle with respect to a normal to the enlargement-side image plane. The enlargement-side image plane and a reduction-side image plane are approximately parallel to each other. The projection optical system provides, on its enlargement side, curvature of field that is convex toward the projection optical system.

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patent: 5730517 (1998-03-01), Berglund
patent: 5820240 (1998-10-01), Ohzawa

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