Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1998-08-07
2000-09-12
Ham, Seungsook
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
3153821, 315403, 315408, G09G 104, H01J 2970
Patent
active
061182338
ABSTRACT:
A video imaging apparatus includes a source of a periodic dynamic focus voltage blanking signal. A dynamic focus voltage amplifier includes a switch responsive to the dynamic focus voltage blanking signal for applying a dynamic focus voltage to a focus electrode, when the switch is at a first state, and for disabling the application of the dynamic focus voltage, when the switch is at a second state to provide for automatic kine bias measurement. A second switch responsive to the focus voltage blanking signal is coupled to the amplifier for applying a current to a stage of the amplifier, when the dynamic focus voltage is disabled. The applied current adjusts the focus voltage, to a level closer to that established immediately after the dynamic focus voltage is enabled for reducing a transient condition.
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Craig Randy Wayne
George John Barrett
Ham Seungsook
Henig Sammy S.
Laks Joseph J.
Patti John
Thomson Licensing S.A.
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