Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1975-02-26
1976-09-28
Farley, Richard A.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
H01J 2956
Patent
active
039834506
ABSTRACT:
A television receiver includes conventional circuitry for detecting the information components of a received television signal. A cathode ray tube viewing screen is scanned by horizontal and vertical scanning circuitry. Low level pincushion correction circuitry imposes a bow-tie signal upon the vertical scan signal forming a composite signal. A series connected vertical yoke has a first terminal coupled to a vertical deflection amplifier and a second terminal connected to ground. The composite signal applied produces vertical scan and pincushion correction currents in the yoke. A tank circuit, resonant at the horizontal scan frequency, is interposed between the vertical yoke windings and a pair of shunting capacitors are connected in parallel with each of the yoke windings and the tank circuit to reduce yoke impedance to the pincushion correction components of the composite signal.
REFERENCES:
patent: 3894268 (1975-07-01), Reh et al.
patent: 3934173 (1976-01-01), Korver
Active Corrections of EW & NS Cushions in 110.degree. Colour TV, P. Guigou, Onde Elec., vol. 51, Fasc. 3, pp. 204-208, Mar. 71.
Blum T. M.
Ekstrand Roy
Farley Richard A.
Zenith Radio Corporation
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