Projector

Details Projector Projector

1994-05-19

1995-12-19

Shafer, Ricky D.

Optical: systems and elements

Mirror

Plural mirrors or reflecting surfaces

359861, 353 37, 353 78, 353 99, G02B 510, G03B 2128

Patent

active

054773946

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 projector 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), McLeod et al.
patent: 2860557 (1958-11-01), Moore et al.
patent: 3674334 (1972-07-01), Abeoffner
patent: 4765733 (1988-08-01), Negishi
patent: 4971436 (1990-11-01), Aoki et al.
Patent Abstracts of Japan vol. 14, No. 405 (P-1100) 31 Aug. 1990 & JP-A-02 157 734 (Hosiden Electron) 18 Jun. 1990.
Patent Abstracts of Japan vol. 17, No. 375 (E-1397) 14 Jul. 1993 & JP-A-05 062 877 (Yasuko Shinohara) 12 Mar. 1993.

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