Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1985-12-24
1987-02-24
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
H01J 2956
Patent
active
046459847
ABSTRACT:
A high voltage generator develops an ultor voltage to accelerate an electron beam of a picture tube. The high voltage generator draws a resupply current in accordance with beam current loading by the picture tube. The deflection circuitry generates line and field deflection currents in respective line and field deflection windings to enable the electron beam to scan a raster. A diode modulator, including a differential amplifier input stage and an emitter-follower output stage, modulates the amplitude of the line deflection current to provide side pincushion correction. The voltage at a high voltage resupply current terminal of the high voltage generator is coupled in a nonlinear manner to the differential amplifier for nonlinearly modulating the amplitude of the line deflection current in accordance with beam current loading.
REFERENCES:
patent: 4309640 (1982-01-01), Gordon
patent: 4469992 (1984-09-01), Favreau et al.
Thorn 9000 Series Colour Television Service Manual, Nov. 1975, p. 19.
Luz David W.
Sutherland, II Hugh F.
Blum Theodore M.
Laks Joseph J.
Rasmussen Paul J.
RCA Corporation
Whitacre Eugene M.
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