Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1990-04-03
1991-06-11
Issing, Gregory C.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
G01S 116
Patent
active
050235257
ABSTRACT:
A deflection circuit for providing magnetic deflection of a cathode ray tube including resonant retrace, including circuitry to minimize the variations in intensity of the image at the beginning of the deflection period after the end of the retrace period, which variation may be caused by parasitic resonances excited by slow turn on of the flyback deflection clamping diode. The circuit enables the flyback clamping diode to begin conduction prior to the end of the retrace period so that the deflection clamping diode is substantially fully conducting and the voltage across the magnetic deflection coil is substantially constant at the end of the retrace period. Thus, a uniform transition is made from retrace to linear deflection and screen intensity variations are avoided.
REFERENCES:
patent: 4612481 (1986-09-01), Storberg
Component Specification for Semiconductor Diodes, Part No. BY448, BY458, pp. 101-107.
Issing Gregory C.
Matzuk Stephen G.
MegaScan Technology, Inc.
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