Picture projecting device

Details Picture projecting device Picture projecting device

1992-12-14

1994-02-15

Cuchlinski, Jr., William A.

Optics: image projectors

Polarizer or interference filter

G03B 2100

Patent

active

052871304

ABSTRACT:
The present invention offers a picture projecting device which projects a clear picture even in a bright environment by cutting out the influence of outer light, regardless of the kind of projector used.
On the surface of a screen 20 inside an airplane, a first polarizing film 22 is put on. Further, a second polarizing film 32 is put on the input portion of outer incident light such as window glasses 9 or cover 8 of the room light. The second polarizing film 32 has the same polarizing trait as that of the first polarizing film 22, but they are placed so that the plane of polarization of the second polarizing film 32 differs from that of the first polarizing film 22 by 90.degree.. The outer incident light H passing through the second polarizing film 32 enters the screen 20 as a polarized transmission light h1. The light will be reduced completely by the first polarizing film 22 placed on the screen and will not reflect.

REFERENCES:
patent: 3350982 (1967-11-01), Marks
patent: 4928123 (1990-05-01), Takafuji
patent: 5148309 (1992-09-01), Yamada et al.

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