Title: Switchable constant current sink

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.

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Inventors: Benrud, Vernal M. (Minneapolis, MN, US)

Application Number: 467971
Filing Date: 1974-05-08
Publication_date: 1976-09-28
Assignee: Sperry Rand Corporation (New York, NY)
Primary Class(es): 315/399 315/367
Other Classes:
US Patent Ref:

3431457	Mar, 1969	Hinkein et al.	315/367.
3435278	Mar, 1969	Carlock et al.	315/367.
3582705	Jun, 1971	Waller	315/367.

Other Refs:
Primary Examiner: Wilbur, Maynard R.
Assistant Examiner: Blum, T. M.
Attorney: Grace; Kenneth T., Nikolai; Thomas J., Truex; Marshall M.