X-ray or gamma ray systems or devices – Photographic detector support – Sheet film cassette
Patent
1983-08-10
1986-05-13
Schilling, Richard L.
X-ray or gamma ray systems or devices
Photographic detector support
Sheet film cassette
378185, 2504821, G03B 4204
Patent
active
045891257
ABSTRACT:
A cassette for X-ray film has a cover and a bottom which can be moved apart to open the cassette and insert a sheet of X-ray film and can be moved together to close the cassette and define a light-tight compartment for the film. A magnetic foil is secured to the bottom of the cassette and an intensifying screen overlies the magnetic foil. The cover carries a resilient border which, in turn, carries a synthetic resin foil. A magnetic sheet is secured to the synthetic resin foil and a second synthetic resin foil is secured to the side of the magnetic sheet remote from the first synthetic resin foil. A second intensifying screen is attached to the second synthetic resin foil. When a sheet of film is accommodated in the cassette and the latter is closed, the intensifying screens are located on opposite sides of the film. The magnetic sheet and magnetic foil are attracted to one another thereby urging the intensifying screens into uniform contact with the film. The synthetic resin foils have the same or approximately the same coefficient of thermal expansion as the intensifying screens. This enables the synthetic resin foils to expand and contract in the same manner as the intensifying screens when the cassette is subjected to temperature fluctuations. The magnetic sheet sandwiched between the synthetic resin foils is elastically deformable so that it can follow the expansions and contractions of the synthetic resin foils. Accordingly, warpage of the magnetic sheet is prevented thereby permitting a uniform pressure to be exerted on the film.
REFERENCES:
patent: 3704369 (1972-11-01), Paidosh
patent: 4418420 (1983-11-01), Bauer et al.
patent: 4438164 (1984-03-01), Pfeifer et al.
Agfa-Gevaert Aktiengesellschaft
Kontler Peter K.
Schilling Richard L.
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