Method of manufacturing a color display tube shadow mask

Details Method of manufacturing a color display tube shadow mask Method of manufacturing a color display tube shadow mask

1979-05-04

1980-09-16

Lazarus, Richard B.

Metal working

Barrier layer or semiconductor device making

Barrier layer device making

29 2516, H01J 914, H01J 902

Patent

active

042221595

ABSTRACT:
A method of manufacturing a color display tube of the refocusing type in which supports of insulation material are secured against an apertured metal plate. The supports are provided with a conductor at least on the side remote from the plate, so that the plate constitutes a first set of lens electrodes and the conductors constitute a second set of lens electrodes. The two sets of lens electrodes form a quadrupole lens in each aperture in the metal plate when a voltage difference is applied between the first set and the second set. The defocusing direction of the quadrupole lens is parallel to the phosphor strips of the display screen.

REFERENCES:
patent: 3586900 (1971-06-01), Seki et al.
patent: 4059781 (1977-11-01), Alphen et al.

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