Cathode ray tube with improved cathode structure

Details Cathode ray tube with improved cathode structure Cathode ray tube with improved cathode structure

1996-12-09

1999-09-28

Sember, Thomas M.

Electric lamp and discharge devices

Cathode ray tube

Ray generating or control

313346R, 313340, 313341, 313344, H01J 2946, H01J 114, H01J 1906, H01J 1908

Patent

active

059593989

ABSTRACT:
A cathode ray tube is provided with an electron gun which comprises a cathode structure which contains an electron-emitting material at an end portion and in which a heating element of bifilarly wound wire is accommodated. Except in the vicinity of the ends of the wire, said wire is provided with an electrically insulating layer (46) whose radius decreases, near the transition between the covered wire and the uncovered ends, by at least 15%, preferably at least 30%. Preferably, the layer (46) having the reduced radius continues for at least 100 .mu.m in the direction of the transition (54). The distance between the transition (54) and the electric connection (61) is smaller than 250 .mu.m, preferably smaller than 150 .mu.m. As a result, the number of uncovered turns between the electric connection (61) and the transition (54) is reduced to below five.

REFERENCES:
patent: 5729082 (1998-03-01), Snijkers
"Quick-Vision CTV Picture Tube A66-410X", by L.J.G. Beriere and A.J. van Ijzxeren (Philips Product Note, 1973).

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