JPH0391391A - Color deflection yoke device - Google Patents

Abstract

PURPOSE:To ensure the correction by compensating a correction magnetic field with a balance correction coil when misconvergence is corrected by a correction current for left right unbalance correction. CONSTITUTION:In the case of driving a deflection yoke, a horizontal deflection current of sawtooth waveform is fed from a horizontal deflection coil 1 to a correction device. In this case, a diode 4 is conductive at the start point of the blanking period, a transient phenomenon of a current flowing to correction coils 2, 3 is utilized to generate a left/right unbalance correction current and it is fed to the correction coils 2, 3. Since the correction currents are unbalance to left and right coils, mis-convergence Xn over the left and right of the screen is corrected.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a color deflection yoke device equipped with means for correcting ξ convergence XH in the horizontal direction on the X-axis of the screen of a color cathode ray tube.

[Conventional technology]

In recent years, cathode ray tube screens (hereinafter referred to as television screens) in color television receivers and color display devices have become increasingly popular.
There is a trend toward higher definition and larger size, and with this, the beam drive becomes wide-angle deflection, and in order to improve focus characteristics, there is a tendency to make the magnetic field distribution of the horizontal deflection coil more linear. However, if the magnetic field distribution of the horizontal deflection coil is made linear, color misalignment between blue B and red R on the , the need to perform this correction is desired.

In addition, when designing the color deflection yoke in order to achieve high definition screens, the convergence trilemma was changed to misconvergence X8. In some cases, the aggregated misconvergence xll must be corrected.

In order to correct this misconvergence
In a cathode ray tube in which 6 and a red R electron gun GR are arranged in-line from left to right when viewed from the screen side, correction magnetic fields that cross the blue B beam and the red R beam are generated in upside-down directions. A four-pole correction coil wired in such a way as to Few color deflection yoke devices equipped with circuits have been put into practical use.

[Problem to be solved by the invention]

Claims (1)

[Claims] A convergence correction coil is connected to the horizontal deflection coil and receives a parabolic correction current to generate a convergence correction magnetic field that alternately crosses the blue beam and red beam in the vertical direction. A diode that is connected in parallel to the coil and turns on when the horizontal deflection pulse becomes a forward voltage to create a parabolic correction current, and a forward half-wave rectified current of the horizontal deflection current by this diode. The collar has a balance correction coil that generates a balance correction magnetic field based on the received signal, and adds this balance correction magnetic field to the convergence correction magnetic field in the first half of the scanning period on the left side of the screen of the cathode ray tube, and corrects the left-right imbalance of the convergence correction magnetic field. Deflection yoke device.