Color picture tube apparatus

Details Color picture tube apparatus Color picture tube apparatus

1987-10-27

1989-04-04

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

H01J 2956

Patent

active

048189197

ABSTRACT:
A color picture tube apparatus comprises a color picture tube including an envelope having a phosphor screen excited by a plurality of electron beams, and deflection means generating horizontal deflection field and barrel type vertical deflection field for the beams, including non-linear magnetic field correction means generating an additional pin-cushion type magnetic field in the vertical field to have preferably convergence characteristics such that vertical direction coma errors can be appropriately corrected throughout every portion of the vertical axis on the screen, whereby high-definition color images can be obtained thereon.

REFERENCES:
patent: 4547707 (1985-10-01), Yabase
patent: 4588930 (1986-05-01), Kobayashi et al.
patent: 4642528 (1987-02-01), Kobayashi et al.
patent: 4704564 (1987-11-01), Ito et al.

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