Projector

Details Projector Projector

1995-04-17

1996-02-27

Dowling, William C.

Optics: image projectors

Reflector

Plural

353 78, 359858, G03B 2128

Patent

active

054953065

ABSTRACT:
A projector has a shortened optical path from a light valve to a screen and a reduction in the depth size of its system and requires less space to mount. Rays of light emitted from a light valve of the projects are refracted by a converging lens and reflected by a plane mirror to converge at the primary focal point of an elliptical mirror, and then travel toward the secondary focal point whereat the focal point of a parabolic mirror also exists and a projection lens is disposed. The light rays pass through the projection lens, are reflected by the parabolic mirror and then are brought to a parallel beam of light that is further collected by a Fresnel lens to finally form an image on a lenticular lens-screen.

REFERENCES:
patent: 2165078 (1939-07-01), Toulon
patent: 2819649 (1958-01-01), McLoed et al.
patent: 2860557 (1958-11-01), Moore et al.
patent: 3674334 (1972-07-01), Offner
patent: 4765733 (1988-08-01), Negishi
patent: 4971436 (1990-11-01), Aoki et al.
patent: 5379080 (1995-01-01), Onozuka

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