Reflection type projector

Details Reflection type projector Reflection type projector

1995-04-19

1996-07-09

Dowling, William C.

Optics: image projectors

Episcope

Reflector between lamp and screen

353 88, 353DIG3, G03B 2100

Patent

active

055349552

ABSTRACT:
A reflection prevention film coats a backside of a stage glass by a vacuum evaporation and coating, etc. A light from a metal halide lamp is not reflected on the back of the stage glass by the reflection preventing film, and is transmitted through the stage glass and is reflected on a surface of the stage glass and a transparent manuscript. The light reflected on the surface of the stage glass and the transparent manuscript enters a projection lens unit and appears as a spot light on a screen, but because the light is not reflected on the backside of the stage glass, so that the amount of the light, which causes the spot light, can be reduced. As a result, the spot light on the screen is inconspicuous.

REFERENCES:
patent: 3619048 (1971-11-01), Engert
patent: 3837739 (1974-09-01), Altman
patent: 4979813 (1990-12-01), Koga et al.
patent: 5325137 (1994-06-01), Konno et al.

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