Cathode ray tube device having insulator coating

Details Cathode ray tube device having insulator coating Cathode ray tube device having insulator coating

1992-06-03

1994-03-08

O'Shea, Sandra L.

Electric lamp and discharge devices

Cathode ray tube

Envelope

220 23A, 313377, H01J 2988

Patent

active

052930963

ABSTRACT:
A CRT having a glass faceplate for forming an image display surface and a metal funnel connected to a peripheral part of the faceplate and forming a side wall. The glass faceplate has a phosphor screen coated on the inside surface and a metal film covering the phosphor screen. A high voltage of 25 KV is applied to the metal film, while the metal funnel is grounded. An insulating layer covers adjacent inside areas of the funnel and faceplate, thereby increasing the distance between the metal film and exposed surfaces of the funnel and preventing creeping discharges.

REFERENCES:
patent: 2132783 (1938-10-01), Goldmark
patent: 2222197 (1940-11-01), Engels
patent: 2682963 (1954-07-01), Faulkner
patent: 2691457 (1954-10-01), Longacre
patent: 2767342 (1956-10-01), Anthony
patent: 4990825 (1991-02-01), Tsukui et al.
Telefunken Manual: "Die Fernseh-Bildrohre", Franzis-Verlag Munchen, (1959), pp. 6 to 19; 33 to 34; 63 to 64 in connection with the diagram of the fabricration process.

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