Electric lamp and discharge devices: systems – Cathode ray tube circuits – Pulse storing
Patent
1992-08-10
1995-01-17
Pascal, Robert J.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Pulse storing
335214, 335301, 335304, 335211, 313430, H01J 2906
Patent
active
053828755
ABSTRACT:
A stray magnetic field suppression system for use in a CRT image display suppresses a stray magnetic field that emanates from the horizontal deflection coil of a beam-deflecting yoke which is energized by sawtooth waveform pulses from a horizontal oscillator. The system comprises two series-connected magnetic coil assemblies in conjunction with a capacitor and activated by the sawtooth waveform pulses. The capacitor serves to integrate the pulses, enabling the suppression system to form an effective field for suppressing a stray magnetic field when the magnetic coil assemblies are interposed in the path of the stray magnetic field on opposite sides of the yoke.
REFERENCES:
patent: 4153858 (1979-05-01), Schylander
patent: 4709220 (1987-11-01), Sakane et al.
patent: 4864192 (1989-09-01), Buchwald et al.
patent: 4950955 (1990-08-01), Hoover et al.
patent: 5073744 (1991-12-01), Buhler
patent: 5198729 (1993-03-01), Powell
"Test-Methods for Visual Display Units: Vixual Ergonomics and Emission Characteristics" MPR 1990:8 1990-1991, Boras, Sweden Copy consists of selected excerpts concerning magnetic fields.
DeWaal Christopher S.
Grocki Wayne D.
Pascal Robert J.
Ratliff Reginald A.
Zenith Electronics Corporation
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