Reflection type overhead projector

Details Reflection type overhead projector Reflection type overhead projector

1991-07-19

1993-04-27

Cuchlinski, Jr., William A.

Optics: image projectors

Reflector

353 31, 353122, 359 70, 359 63, G02F 113

Patent

active

052066738

ABSTRACT:
A mirror Fresnel lens (12) is disposed on a base (11), on which a liquid crystal display (18) is mounted. The liquid crystal display (18) is provided with a polarization plate (24) only in the mirror Fresnel lens (12) side. Light from a light source (15) passes through the liquid crystal display (18), is reflected by the mirror Fresnel lens (12), again passes through the liquid crystal display (18), is converged by a projection lens 16 and reflected by the mirror (17) and eventually arrives at a screen (20). A separated polarization plate (25) is provided in a manner to overlap with the projection lens 16. The separated polarization plate (25) is paired with the polarization plate (24).

REFERENCES:
patent: 4406530 (1983-09-01), Hasegawa et al.
patent: 4818074 (1989-04-01), Yokoi et al.
patent: 4921343 (1990-05-01), Ushiro et al.
patent: 4928123 (1990-05-01), Takafuji
patent: 4943156 (1990-07-01), Vanderwelf
patent: 4953971 (1990-09-01), Highfill
patent: 4969730 (1990-11-01), VanderBrandt
patent: 4995718 (1991-02-01), Jachimowicz et al.

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