Switchable constant current sink

Details Switchable constant current sink Switchable constant current sink

1974-05-08

1976-09-28

Wilbur, Maynard R.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315367, H01J 2970, H01J 2976

Patent

active

039834530

ABSTRACT:
A constant current sink for a cathode ray tube (CRT) display system is disclosed. The display system includes X and Y deflection coil current drive systems including parallel coupled constant current sinks that establish the deflection-determining current levels that flow through the X and Y deflection coils. Each constant current sink draws a fixed current level, and one or more are selectively switched ON, i.e., caused to draw a fixed current level through the deflection coil load from a first power supply, or OFF, i.e., caused to draw the fixed current level from a second power supply, to establish the desired electron beam position on the CRT. Means are provided for correcting for the pin-cushion, i.e., non-linear, effects associated with a flat CRT face.

REFERENCES:
patent: 3431457 (1969-03-01), Hinkein et al.
patent: 3435278 (1969-03-01), Carlock et al.
patent: 3582705 (1971-06-01), Waller

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