Quadrupole convergence circuit

Details Quadrupole convergence circuit Quadrupole convergence circuit

1977-05-31

1978-06-27

Wilbur, Maynard R.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315 13C, H01J 2970, H01J 2976

Patent

active

040977846

ABSTRACT:
In a color cathode ray tube deflection apparatus having a deflection yoke with horizontal, vertical and quadrupole windings and affixed to a color cathode ray tube, a quadrupole convergence circuit includes a quadrupole winding coupled to a source of substantially parabolic-shaped horizontal and vertical frequency signals and coupled by a signal clamping circuit which is, in turn, shunted by an impedance varying in proportion and an opposite direction to variations in the impedance of the clamping circuit as determined by the value of the substantially parabolic-shaped vertical frequency signal whereby convergence at the corners of a cathode ray tube is enhanced.

REFERENCES:
patent: 3821591 (1974-06-01), Lister
patent: 3930185 (1975-12-01), Barkow et al.
patent: 4028586 (1977-06-01), Mengle

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