Rear projection optical system

Details Rear projection optical system Rear projection optical system

2006-04-04

2006-04-04

Dowling, William C. (Department: 2851)

Optics: image projectors

Cabinet encloses projector and one side of screen

Reflector between lamp and screen

C353S099000

Reexamination Certificate

active

07021770

ABSTRACT:
An oblique projection optical system for leading rays of light from a display surface on which an image is displayed to a projection surface in such a way that the ray of light from the center of the display surface is obliquely incident on the projection surface in order to project a magnified image of the image displayed on the display surface onto the projection surface includes a plurality of reflecting surfaces having a power. At least two of the reflecting surfaces have a free-form curved surface, and, of all the reflecting surfaces, the one closest to the projection surface has a negative power and at least one of the other has a positive power. Alternatively, in a rear projection optical system having a projection optical system for projecting an image displayed on a panel display surface onto a screen surface, the projection optical system includes at least four curved-surface reflecting mirrors.

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