Networks for limiting x-radiation from cathode ray tubes

Details Networks for limiting x-radiation from cathode ray tubes Networks for limiting x-radiation from cathode ray tubes

H - Electricity

04

N

350/109

H04N 5/44 (2006.01) H02H 3/02 (2006.01) H02H 3/38 (2006.01) H04N 5/63 (2006.01)

Patent

CA 1086420

ABSTRACT Operation of a cathode ray tube above the Isodose line is prevented by generating voltages that are propor- tional to both the EHT supplied to the cathode ray tube and the beam current of the cathode ray tube. These voltages are applied to a sensing device, such as a neon tube, which generates a trigger pulse when the voltage across it exceeds some predetermined magnitude. The sensing device is selected so that the trigger pulse is generated always below the Isodose line. The trigger pulse is used to inhibit operation of the cathode ray tube as by interrupting the supply of EHT to the cathode ray tube.

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