Electric lamp and discharge devices – Cathode ray tube – Shadow mask – support or shield
Patent
1985-10-25
1987-04-07
DeMeo, Palmer C.
Electric lamp and discharge devices
Cathode ray tube
Shadow mask, support or shield
313407, 313408, 427 68, 445 68, H01J 2907, H01J 2910, H01J 9227
Patent
active
046563890
ABSTRACT:
A novel color selection electrode assembly is utilized in screening a pattern of phosphor areas upon the faceplate of a color cathode ray tube. The faceplate, which is formed of a material having a predetermined temperature coefficient of expansion, has registration affording means. The aforesaid assembly comprises an auxiliary mount formed of a material having a temperature coefficient of expansion greater than that of the faceplate and has a central opening of such span as to enable the mount to surround the periphery of the faceplate. Index bosses, cooperable with the faceplate registration affording means, are detachably secured to the mount. A planar metal foil having a predetermined pattern of apertures and formed of a material having a temperature coefficient of expansion not greater than that of the mount is secured to the mount. The index bosses cooperate with the registration affording means on the envelope to permit repeated precise registrations between the foil and the faceplate to facilitate mating of the electrode assembly of the faceplate. Finally, the invention contemplates a method of utilizing the electrode assembly for screening a phosphor pattern as well as methods of making a color cathode ray tube having such an electrode assembly.
REFERENCES:
patent: 3873874 (1975-03-01), Shinal
patent: 3894321 (1975-07-01), Moore
patent: 4547696 (1985-10-01), Strauss
Clarke, Jr. Ralph E.
DeMeo Palmer C.
O'Connor Cornelius J.
Wieder K.
Zenith Electronics Corporation
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