Cathode ray tube arc-over protection

Details Cathode ray tube arc-over protection Cathode ray tube arc-over protection

1978-09-26

1980-06-10

Moore, David K.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Combined cathode ray tube and circuit element structure

313477R, 313479, H01J 2316

Patent

active

042074932

ABSTRACT:
The high voltage terminal of the ultor capacitance of a cathode ray tube is coupled to an electron gun structure. The ultor return terminal which typically comprises an outer conductive coating of the cathode ray tube envelope is coupled to the ground return base pin of the cathode ray tube. The ground termination for electrical components and the chassis is also coupled to the ground return base pin. During arc-over, the cathode ray tube ultor capacitance discharges through the ground return base pin. Arc-over current oscillations flow in the chassis and electrical component circuitry by means of stray capacitive coupling to the ultor return terminal. A resistor is coupled to the chassis and to the ultor return terminal for damping arc-over current oscillation in the chassis and in the component circuitry.

REFERENCES:
patent: 3551821 (1970-12-01), Griffey
patent: 3909655 (1975-09-01), Grimmett et al.
patent: 4047225 (1977-09-01), Pittenger
patent: 4101803 (1978-07-01), Retsky et al.
Kleisma, A. C. "Protection Against Flashover in Color TV" Phillips _Application Information Sep. 1967, pp. 3-10.

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