Protection-type display device

Details Protection-type display device Protection-type display device

1996-10-18

1998-09-08

Dowling, William

Optics: image projectors

Cabinet encloses projector and one side of screen

353 38, 359457, G03B 2114

Patent

active

058035672

ABSTRACT:
A projection-type display device includes an image projector and a screen, in which image projector is for projecting image light rays and the screen is disposed on a side to which the image light rays are projected from the image projector. The screen is formed of a Fresnel lens sheet with one side thereof facing the image projector and a lenticular sheet disposed on the other side of the Fresnel lens sheet for transmitting the image light rays that are formed into a picture on the screen. The Fresnel lens sheet has a fixed focal length in a region from the center of the Fresnel lens sheet to a prescribed distance and focal lengths gradually decreasing toward the outer periphery of the Fresnel lens sheet in a region exceeding the prescribed distance.

REFERENCES:
patent: 4725134 (1988-02-01), Ogino
patent: 4773731 (1988-09-01), Goldenberg et al.
patent: 4961642 (1990-10-01), Ogiuo
patent: 5184224 (1993-02-01), Mitani et al.
patent: 5208620 (1993-05-01), Mitsutake et al.
patent: 5485308 (1996-01-01), Hirata et al.
patent: 5513036 (1996-04-01), Watanabe et al.
patent: 5581407 (1996-12-01), Mitani et al.

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