Linearity corrected deflection circuit

Details Linearity corrected deflection circuit Linearity corrected deflection circuit

1985-11-25

1987-01-06

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

H01J 2956

Patent

active

046349383

ABSTRACT:
A linearity correction circuit for correcting asymmetrical linearity errors of the line deflection current includes a resonant capacitor coupled to a first inductor for forming a resonant circuit having a resonant frequency greater than or equal to the deflection retrace frequency. A controllable switch coupled to the resonant circuit and to the deflection trace capacitor becomes conductive at the beginning of retrace to generate an oscillatory current pulse in the resonant circuit that removes a predetermined amount of charge from the trace capacitor during retrace. A second, relatively large valued inductor is coupled to the line deflection winding and is responsive to the deflection retrace pulse voltage for supplying during the trace interval a linearity correction current to the trace capacitor via the resonant capacitor.

REFERENCES:
patent: 3428853 (1969-02-01), Akatsu
patent: 4281275 (1981-07-01), Chapman et al.
patent: 4468593 (1984-08-01), Haferl
patent: 4516058 (1985-05-01), Haferl
Manual: "Solid State Color Television - The RCA CTC-40 Chassis", pp. 75-86, copyright 1968.

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