CRT With internal thermionic valve for high voltage control

Details CRT With internal thermionic valve for high voltage control CRT With internal thermionic valve for high voltage control

1981-03-30

1984-05-22

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315409, 358 73, 313479, H01J 2980

Patent

active

044503873

ABSTRACT:
The magnitude of a DC high voltage supplied to an internal element of a CRT is varied by a thermionic valve that is located within the envelope of the CRT and that forms a voltage divider with an external load resistor. Only a small scale signal referenced near ground is needed to produce a several thousand volt change in the high voltage supplied to the internal CRT element. The variable high voltage may control a variable deflection factor, variable spot size, or in the case of a beam penetration CRT, either variable persistence or variable trace color. In a particular beam penetration color CRT having a split anode the thermionic valve comprises a tetrode flood gun coupled by an electron mirror to a plate region in the neck of the CRT.

REFERENCES:
patent: 2454204 (1948-11-01), Raymond
patent: 3015749 (1962-01-01), Francken
patent: 4223252 (1980-09-01), Doran

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