In-line type electron gun for color picture tube

Details In-line type electron gun for color picture tube In-line type electron gun for color picture tube

1988-01-21

1989-04-25

Wieder, Kenneth

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313447, H01J 2958

Patent

active

048251216

ABSTRACT:
In an electron gun for a color picture tube having three cathodes which are arrayed orthogonally to the axial direction of the tube and at equal intervals on a straight line, and a first grid and a second grid which are successively arrayed and each of which has apertures aligned with electron beam paths corresponding to the three cathodes; the improvement comprising the fact that the surface of at least one of the first grid and the second grid opposing to the other includes aperture-vicinity flats which correspond to the respective apertures, and annular margins which are protruded toward the other opposing grid around the aperture-vicinity flats, and that the annular margin corresponding to the central aperture is retracted from a plane which forms the two annular margins corresponding to the outer apertures, while the aperture-vicinity flats corresponding to the three apertures are so formed as to be substantially coplanar.

REFERENCES:
patent: 4063128 (1977-12-01), Hughes
patent: 4366414 (1982-12-01), Hatayama et al.

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