Color cathode ray tube with decenterable magnetic body

Details Color cathode ray tube with decenterable magnetic body Color cathode ray tube with decenterable magnetic body

1996-10-18

1998-05-26

Dombroske, George W.

Electric lamp and discharge devices

Cathode ray tube

Beam deflecting means

313440, H01J 2974

Patent

active

057571201

ABSTRACT:
A color cathode ray tube device is provided in which the generation of the trapezoidal distortion of a rectangular raster is controlled and an off-axis misconvergence is corrected to obtain high image quality in the peripheral portion of a screen. An annular ferrite core is provided adjacently to the electron gun side end face of a ferrite core of a deflection yoke so as to b decentered radially within the predetermined range around the central axis of the deflection yoke in the tube axial direction. An asymmetric magnetic field is formed on the electron gun side of the deflection yoke by the annular ferrite core which has been decentered. Thus, the off-axis misconvergence can be corrected while controlling the generation of the trapezoidal distortion.

REFERENCES:
patent: 4782264 (1988-11-01), Yamazaki et al.
patent: 4933596 (1990-06-01), Yoshii et al.
patent: 4943753 (1990-07-01), Hevesi
patent: 5475282 (1995-12-01), Liao
patent: 5486736 (1996-01-01), Lee et al.

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