Film presence indicator

Details Film presence indicator Film presence indicator

1995-12-04

1997-07-29

Porta, David P.

X-ray or gamma ray systems or devices

Photographic detector support

Sheet film cassette

378165, 378187, G03B 1726

Patent

active

056527802

ABSTRACT:
An apparatus for indicating the presence or absence of a sheet within a cassette. The apparatus includes a plate and a mask stationarily mounted on a first side of the plate. An indicating element is movably mounted in overlapping orientation to the mask for one-dimensional movement between a first position wherein the indicating element and the mask define a first pattern indicative of the absence of the sheet, and a second position wherein the indicating element and the mask define a second pattern indicative of the presence of the sheet. A spring biases the indicating element in the first position, and a movable member moves the indicating element to define the second pattern when the sheet is positioned within the cassette. Alternatively, the indicating element is stationarily mounted and the mask is movably mounted for one-dimensional movement.

REFERENCES:
patent: 3784835 (1974-01-01), Schmidt
patent: 4248172 (1981-02-01), Krobel et al.
patent: 4394772 (1983-07-01), Okamoto et al.
patent: 4444484 (1984-04-01), Best et al.
patent: 4582018 (1986-04-01), Fleck et al.
patent: 4744100 (1988-05-01), Bauer et al.
patent: 4807271 (1989-02-01), Covington et al.
patent: 5388140 (1995-02-01), Robertson
patent: 5448615 (1995-09-01), Robertson

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