Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1979-12-19
1981-10-06
Hubler, Malcolm F.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
H01J 2970
Patent
active
042938023
ABSTRACT:
An electromagnetic deflection yoke for a cathode ray tube (CRT) stroke display system is operated above its resonant frequency to allow faster writing speeds and the use of a single pair of XY deflection yokes for both position and write deflection. Operation above resonant frequency is accomplished by the inclusion of a second-order feedback network tuned to the frequency characteristics of the deflection yoke and associated shunt capacitance. Differing from prior art systems, the current applied as a feedback signal to an input of the yoke driver amplifier in a closed loop system is directly proportional to actual, instantaneous inductive component of the yoke current and to this component only.
REFERENCES:
patent: 2479081 (1949-08-01), Poch
patent: 2545346 (1951-03-01), Edelsohn
patent: 3501583 (1970-03-01), Schwartz
patent: 3508109 (1970-04-01), Congdon
patent: 3515933 (1970-06-01), Myers
patent: 3529206 (1970-09-01), Rodal
patent: 3745477 (1973-07-01), Freeborn
patent: 3757155 (1973-09-01), Waehner
"Optimum Utilization of Magnetic Deflection Yokes" by Hugh Connell Masterman, Submitted in Partial Fulfillment of the Requirements for the Degrees of Bachelor of Science and Master of Science at the Massachusetts Institute of Technology, Jun. 1971.
Hubler Malcolm F.
International Business Machines - Corporation
Lefeve Douglas H.
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