Apparatus and method for spot-knocking television picture tube e

Details Apparatus and method for spot-knocking television picture tube e Apparatus and method for spot-knocking television picture tube e

1980-10-15

1982-04-27

McQuade, John

316 27, H01J 900

Patent

active

043267629

ABSTRACT:
Apparatus and method is disclosed for spot-knocking a cathode ray picture tube by beneficial arcing between selected electrodes of an electron gun sealed in the evacuated envelope of the tube. The invention is particularly useful in spot-knocking certain cathode ray picture tubes having a resistive arc-suppression means and static elimination system. The picture tube has an inherent capacitance that can store energy in an amount capable of inducing destructive arcing during spot-knocking. In one embodiment of the invention, a bipolar potential is applied across the electrodes to be spot-knocked, resulting in the amount of energy in the induced arcing, for a given applied potential, being very much less than would be the case if a unipolar potential were applied. Other embodiments include resistive means and spark gap means for discharging the voltage between lead-in pins before a destructive arc can occur therebetween.

REFERENCES:
patent: 2171224 (1939-08-01), Rose
patent: 2285551 (1942-06-01), Zworykin
patent: 3267321 (1966-08-01), Gessford, Sr.
patent: 3736038 (1973-05-01), Nakanishi et al.
patent: 3995194 (1976-11-01), Blacker, Jr. et al.
patent: 4038616 (1977-07-01), Ball
patent: 4101803 (1978-07-01), Retsky et al.
patent: 4124263 (1978-11-01), Neuber et al.
"Flashover in Picture Tubes and Methods of Protection", A. Ciuciura, The Radio and Electronic Engineer, Mar. 1969.

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