Electric lamp and discharge devices: systems – With cathode or cathode heater supply circuit – Automatic cut-out or voltage regulator in the cathode or...
Patent
1990-05-09
1992-07-14
LaRoche, Eugene R.
Electric lamp and discharge devices: systems
With cathode or cathode heater supply circuit
Automatic cut-out or voltage regulator in the cathode or...
315 94, 315106, 315291, H01J 2998
Patent
active
051306069
ABSTRACT:
A CRT display system is described wherein a measure of the beam current generated within the CRT is derived and the voltage across the cathode heater modified as a function of this measure. In this way the optimum voltage across the heater coils is maintained, thus preventing "cathode stripping" at times of peak beam currents, and optimizing the CRT's working lifetime.
REFERENCES:
patent: 4149110 (1979-04-01), Dallos et al.
patent: 4247801 (1981-01-01), Dallos et al.
IBM TDB, vol. 9, No. 29, Feb. 89, pp. 3896-3898.
Clitheroe Adrian M.
Eagle David J.
Morrish Andrew J.
Williams Julian D.
Cockburn Joscelyn G.
International Business Machines - Corporation
LaRoche Eugene R.
Neyzari Ali
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