Apparatus for deflecting electron beams and color cathode ray tu

Details Apparatus for deflecting electron beams and color cathode ray tu Apparatus for deflecting electron beams and color cathode ray tu

1992-11-13

1993-11-09

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315371, 31536828, H01J 2970, H01J 2976

Patent

active

052606279

ABSTRACT:
A deflecting apparatus includes a saturable reactor, and this saturable reactor is constituted by a first saturation control coil and a second saturation control coil for generating a magnetic field having an opposite polarity to that of the first saturation control coil. The first saturation control coil is connected to a resistor to form a first deflection current system, and the second saturation control coil is connected in series with a pair of diodes that are connected to have opposite polarities, thereby forming a second deflection current system connected in parallel with the first deflection current system. The first and second saturation control coils are magnetically coupled to first and second impedance control coils respectively connected to horizontal deflection coils. Thus, a horizontal deflection current is controlled by the first and second impedance control coils in accordance with the vertical deflection current flowing through the first and second saturation control coils, thereby adjusting the horizontal deflection magnetic field in accordance with vertical deflection of the electron beams. As a result, a cross convergence error between the pair of side beams can be corrected simultaneously. This correction can be performed even when the deviation amounts of the cross convergence error differ among the intermediate and upper and lower end portions of the screen.

REFERENCES:
patent: 3944884 (1976-03-01), Wilocki
patent: 4547707 (1985-10-01), Yabase
patent: 4704564 (1987-11-01), Ito et al.
patent: 4818919 (1989-04-01), Kobayashi et al.

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