Random color switch for beam penetration CRT

Details Random color switch for beam penetration CRT Random color switch for beam penetration CRT

1981-05-01

1982-10-26

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

358 73, H01J 2980

Patent

active

043564356

ABSTRACT:
A color switch for a beam penetration CRT includes a return path through a pair of reverse biased diodes to recapture a substantial amount of the energy associated with changing the voltage on the anode of the CRT for a write period in a non-baseline color. A driver circuit, which includes the low voltage power supply, is connected through a switch to one end of the primary winding of a transformer. The primary winding is also connected through one of two diodes to each half of the low voltage power supply for the driver. By opening the switch at the end of a color write period in a non-baseline color, the rapid decrease in the current through the primary winding of the transformer to restore DC balance of the magnetizing current in the transformer core forms a reverse voltage which is returned to the low voltage power supply through the diodes. The baseline color is selected to be in an intermediate range so that the anode voltage level can be swung in either direction so that a random non-baseline color can be selected for a color write period.

REFERENCES:
patent: 3492416 (1970-01-01), Weber
patent: 3863097 (1975-01-01), Labudda
patent: 3887838 (1975-06-01), Thurston
patent: 3906333 (1975-09-01), Kalmanash
patent: 3914617 (1975-10-01), Corbel
patent: 4092566 (1978-05-01), Chambers et al.
patent: 4104564 (1978-08-01), Cohen et al.
patent: 4151444 (1979-04-01), Jenness
patent: 4281272 (1981-07-01), Spilsbury

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