Mask system for radiograph light box

Details Mask system for radiograph light box Mask system for radiograph light box

1987-09-24

1988-10-04

Husar, Stephen F.

Illumination

Photographic lighting

Including specific light modifier

40361, 355 7, 355126, 362281, G03B 1502

Patent

active

047759186

ABSTRACT:
A masking system for masking the viewing area of a radiograph light box comprises a pair of spaced, endless belts disposed in substantially perpendicular relationship. Each of the belts has spaced opaque regions and spaced transparent regions connecting the opaque regions. The belts are supported on rollers and are movable to selectively position portions of the opaque regions into alignment with the edge regions of the image support.

REFERENCES:
patent: 708770 (1902-09-01), Johnson
patent: 1813689 (1931-07-01), Weisker
patent: 1988654 (1935-01-01), Haag
patent: 4325630 (1982-04-01), Kimura et al.
patent: 4510708 (1985-04-01), Pokrinchak
Japanese Patent Abstract; No. 60-242447, published 12/2/1985.

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