Radiant energy – Invisible radiation responsive nonelectric signalling – Photographic type
Patent
1975-04-24
1977-07-05
Smith, Alfred E.
Radiant energy
Invisible radiation responsive nonelectric signalling
Photographic type
250491, G11B 100
Patent
active
040342255
ABSTRACT:
A film drive mechanism is disclosed for use with a radiographic apparatus which provides continuous radiographs or x-rays of a selected portion of a subject lying in a horizontal position by simultaneously rotating an x-ray source and an x-ray film holder including an x-ray film about the subject. An x-ray film cassette is mounted in the film holder and while the film holder rotates about the subject, the film cassette is moved past an x-ray slit. The film holder includes a novel drive mechanism for moving the cylindrical film cassette, in which an x-ray film is placed, at the proper rate of speed to provide the desired x-ray during rotation of the source and film holder. This is accomplished by utilizing a sloped cam having a configuration determined by the desired focal trough to vary the relative rotation of the shaft of a motor driving the film and the housing of the motor.
REFERENCES:
patent: 2281931 (1942-05-01), Frank
patent: 3536913 (1970-10-01), Huchel
patent: 3792334 (1974-02-01), Rouge
patent: 3832546 (1974-08-01), Morsell et al.
Fleck Horst G.
Hudson Donald C.
Morris Charles R.
Senghaas Karl A.
Anderson B. C.
Pennwalt Corporation, S.S. White Dental Products Division
Smith Alfred E.
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