Shadow-mask color picture tube

Details Shadow-mask color picture tube Shadow-mask color picture tube

1989-07-05

1991-08-06

Yusko, Donald J.

Electric lamp and discharge devices

Cathode ray tube

Beam deflecting means

313430, 313431, H01J 2970, H01J 2976

Patent

active

050380745

ABSTRACT:
A shadow-mask color picture tube has an auxiliary deflecting device located between the deflection yoke and shadow mask. In a picture tube with in-line electron guns, the auxiliary deflection device includes a pair of deflection coils, for example, for deflecting the electron beams in the horizontal direction. In a picture tube with delta electron guns, the auxiliary deflection device includes two pairs of deflection coils, for example, for deflecting the electron beams in both the horizontal and vertical directions. The auxiliary deflection devices deflect the electron beams by an amount that closely aligns them with the doming direction of the shadow mask, thereby reducing landing error and improving color purity.

REFERENCES:
patent: 3873877 (1975-03-01), Machida
patent: 4331903 (1982-05-01), Takenaka et al.
"A New High-Performance Color Picture Tube: The Mask-Focusing Color Tube"; Hiromi Kanai et al., Jan. 1976, pp. 45-49, and FIGS. 1-2.

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