Electric lamp and discharge devices – Cathode ray tube – Shadow mask – support or shield
Patent
1987-12-23
1989-02-14
DeMeo, Palmer C.
Electric lamp and discharge devices
Cathode ray tube
Shadow mask, support or shield
313408, 313482, H01J 2907
Patent
active
048048810
ABSTRACT:
An improved front assembly for a color cathode ray tube having a tension foil shadow mask is disclosed. The faceplate of the tube has on its inner surface a centrally disposed phosphor screen surrounded by a peripheral sealing area adapted to mate with a funnel. The assembly includes a shadow mask support structure for securing a shadow mask in tension on the structure and for spacing the shadow mask from the screen. The support structure is comprised of an assembly including a plurality of elongated members that substantially surround the centrally disposed phosphor screen and meet at corner areas of the screen. The elongated members having open ends. The support structure also includes corner connector members having reduced end or plug portions projecting into the open ends of adjacent ones of the elongated members at the corner areas of the screen. The plug portions are sized and shaped to provide a snug fit with the open ends of the adjacent elongated members and are secured and sealed thereto. The aforesaid snug fit provides a fixturing for the corner connectors and the elongated members to facilitate the securing and sealing processes of the assembly. The corner connector members, except for the plug portions, are sized and shaped to form a continuation of the cross-sectional configuration of the elongated members.
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"The CBS Colortron: A Color Picture Tube of Advanced Design", Fyler et al. Proc. of the IRE, Jan. 1954 Dec. class R 583.6.
"A High Brightness Shadow Mask Color CRT for Cockpit Display", Robinder, et al. Society for Information Display, 1983.
DeMeo Palmer C.
Zenith Electronics Corporation
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