Projection optical apparatus comprising automatic adjustment uni

Details Projection optical apparatus comprising automatic adjustment uni Projection optical apparatus comprising automatic adjustment uni

1994-10-24

1996-07-16

Will, Thomas B.

Optics: image projectors

Lens support

Lens position adjustable

353 69, G03B 2153

Patent

active

055371680

ABSTRACT:
In a projection type display apparatus for illuminating a projection original image with light from a projection light source, and projecting light transmitted through the illuminated original image using a projection lens, light reflected by a projection surface is extracted from a position at an original image side of the projection lens or in the projection lens, and the extracted light is received by a focus detection unit.

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