Electric lamp and discharge devices – Cathode ray tube – Shadow mask – support or shield
Patent
1989-10-16
1991-09-24
Wieder, Kenneth
Electric lamp and discharge devices
Cathode ray tube
Shadow mask, support or shield
313402, H01J 2907
Patent
active
RE0336980
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 target surrounded by a peripheral sealing area adapted to mate with a funnel. A separate metal faceplate frame is secured to the inner surface of the faceplate between the sealing area and the target. The separate metal frame according to the invention supports a welded-on tension foil shadow mask a predetermined distance from the inner surface of the faceplate. The separate faceplate-mounted metal frame may have according to the invention a plurality of slurry-passing structures contiguous to the inner surface of the faceplate for passing any surplusage of slurry during the radial-flow slurry-deposition process used in screening the faceplate. Various configurative embodiments of the faceplate-mounted metal frame according to the invention are also disclosed.
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"The CBS Colortron: a Color Picture Tube of Advanced Design," Fyler et al., Proc. of the IRE, Jan. 1954, pp. 326-334.
"A High-Brightness Shadow-Mask Color CRT for Cockpit Displays", Robinder et al., SID 83 Digest, 12/1983, pp. 72 & 73.
Wieder Kenneth
Zenith Electronics Corporation
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