Backside disc flush for light valve projector

Details Backside disc flush for light valve projector Backside disc flush for light valve projector

1986-06-24

1988-02-09

Moore, David K.

Electric lamp and discharge devices

Cathode ray tube

Screen

350361, 358 62, 358233, H01J 2912

Patent

active

047243554

ABSTRACT:
A flushing system is provided for a light valve of the Schlieren dark field type. A small amount of filtered fluid is injected into the space between the rotating disc and the output window of the light valve. This is done by injecting the fluid through the center disc bearing, thereby providing a uniform radial flow outwardly from the center and flushing out any particles in the space and preventing any particles in the surrounding fluid from moving into the raster area. By properly regulating the flow of the center flush fluid, the disc can be floated off the support during rotation. This reduces wear generated particles which contribute to substrate buildup and subsequent loss of light throughput. In addition, erratic disc motion caused by a stick and slip frictional effect is reduced.

REFERENCES:
patent: 3874786 (1975-04-01), Towlson

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