Radiant energy – With charged particle beam deflection or focussing – With target means
Patent
1975-11-24
1976-07-06
Church, Craig E.
Radiant energy
With charged particle beam deflection or focussing
With target means
250409, H05G 130
Patent
active
039683729
ABSTRACT:
An X-ray tube protective circuit wherein the selected exposure time and X-ray tube power are compared prior to operation to determine whether or not a condition exists which would exceed the anode rating of the tube and thereafter prevents operation while permitting an X-ray exposure for a safe condition. The subject invention is directed to a means for reducing the number of switch decks normally required in connection with a plurality of resistive voltage divider networks utilized to simulate the tube rating charts for the X-ray tube(s) utilized and comprises a plurality of resistive networks simulating rating chart curves mounted on a plug-in printed circuit board and coupled to a common time select switch deck by means of an isolating diode network. A current source is connected to a circuit node of the selected resistor network through the time selector switch and diode network which in combination with a reference voltage applied to one end of the selected resistor network, develops a signal at the opposite end thereof which corresponds to the allowable kV .times. mA for the time selected which is applied to one input of a comparator whose other input is coupled to a signal corresponding to the desired kV .times. mA and whose output is fed to the control circuitry which is adapted to enable or inhibit X-ray tube operation.
REFERENCES:
patent: 3838285 (1974-09-01), Siedband
CGR Medical Corporation
Church Craig E.
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