Method of manufacturing a color display tube and color display t

Details Method of manufacturing a color display tube and color display t Method of manufacturing a color display tube and color display t

1978-04-19

1979-08-14

Lazarus, Richard B.

Metal working

Barrier layer or semiconductor device making

Barrier layer device making

29 2518, H01J 902

Patent

active

041640594

ABSTRACT:
A focusing shadow mask incorporating an electrostatic lens at each mask aperture is produced by creating an electrode comprising a set of parallel conductors on one surface of an insulator sheet and a second electrode on the other surface. The second electrode has apertures defined either by a second set of parallel conductors that are perpendicular to the first set or by a conductive grid that includes conductors parallel to the first set and other conductors perpendicular to the first set. Additional metal can be built up on either electrode to strengthen the combined structure. After formation of both electrodes, the areas of the insulating material are selectively etched away to form apertures for beams to pass through.

REFERENCES:
patent: 3186883 (1965-06-01), Frantzen
patent: 3586900 (1971-06-01), Seki et al.
patent: 3680184 (1972-08-01), Greene
patent: 3688359 (1972-09-01), Oikawa et al.
patent: 3787106 (1974-01-01), Schermerhorn
patent: 3799816 (1974-03-01), Schneble, Jr. et al.
patent: 3999263 (1976-12-01), Marshall et al.

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