Color cathode ray tube.

摘要

In a color cathode ray tube, an electron gun assembly (7) of an in-line type is received in a neck (4) of a vacuum envelope and vertical and horizontal magnetic coils 9 are arranged on an outer surface of the funnel 2 of the vacuum envelope. The vertical magnetic coil 9 produces a vertical magnetic field which has an asymmetrical magnetic field distribution with respect to a horizontal axis within a deflection plane. The asymmetrical magnetic field distribution is determined as a function of a screen position on which electron beams de- fleeted from the horizontal axis on the screen are landed. The electron beams are subjected to negative astigmatism by the vertical deflection magnetic field.