System for stabilizing cathode emissions with an in-line gun cat

Details System for stabilizing cathode emissions with an in-line gun cat System for stabilizing cathode emissions with an in-line gun cat

1985-11-21

1987-11-10

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

358168, H01J 2952

Patent

active

047059923

ABSTRACT:
A system for stabilizing the cathode emissions of an in-line gun cathode ray tube includes subsystems functionally identical to one another linked to each of the cathodes of an in-line gun cathode ray tube. During the time that the CRT beam is retracing vertically, each subsystem imposes a fixed, predetermined voltage on a cathode in the cathode ray tube, samples the current flowing to the cathode, compares the sampled current to a predetermined, desired reference current for the cathode, develops a differential signal representing the difference, if any, between the sampled current and the reference current, and then drives the current flowing to the cathode from its actual value to its predetermined, reference value so as to maintain a predetermined, desired ratio of the currents flowing to each of the cathodes.

REFERENCES:
patent: 4461983 (1984-07-01), Lees
patent: 4506292 (1985-03-01), Newton et al.
patent: 4514664 (1985-04-01), Kasagi et al.
patent: 4525653 (1985-06-01), Smith

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