Radiant energy – With charged particle beam deflection or focussing – With target means
Patent
1976-11-10
1978-08-08
Church, Craig E.
Radiant energy
With charged particle beam deflection or focussing
With target means
250468, 250471, G03B 4116
Patent
active
041059204
ABSTRACT:
In a spot film device, the inner and main carriages for a film cassette are positioned with reversible servo motors. An x-ray grid is mounted on the bottom of the main carriage and a cross grid is mounted on tracks beneath the carriage such that the cross grid may be used or not used for fluoroscopy and both grids may be used for radiography. Field defining masks are also mounted for translating selectively with the carriage. Individual reversible servo motor drives are used to advance and retract the masks and cross grid. Means are provided for absorbing shock or negating drive system momentum when the masks or grid are stopped abruptly. Reduced power is applied to the mask and grid drive motors when the masks and grid reach their stops for holding them against their stops. A motor driven palpator cone, having unique driving and locking means is provided. Means are provided for loading and unloading cassettes from either the front or rear of the spot film device.
REFERENCES:
patent: 3514596 (1970-05-01), Naylor
patent: 3521061 (1970-07-01), Slagle
patent: 3848134 (1974-11-01), Gieschen
patent: 3862426 (1975-01-01), Thomas
patent: 3989950 (1976-11-01), Hunt
Gray Floyd L.
Konle Robert L.
Pury Thomas
Sivertsen Marvin L.
Stehr Richard E.
Church Craig E.
General Electric Company
Hohenfeldt Ralph G.
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