Cathode assembly incorporating a black layer formed from particl

Details Cathode assembly incorporating a black layer formed from particl Cathode assembly incorporating a black layer formed from particl

1994-03-17

1996-08-06

O'Shea, Sandra L.

Electric lamp and discharge devices

Cathode ray tube

Ray generating or control

313270, 313337, 4271263, 427 77, H01J 2902

Patent

active

055436820

ABSTRACT:
A black coating having a uniform thickness is formed, on the inner surface of the cathode sleeve, as a sintered layer obtained by mixing tungsten having an average particle diameter in a range of 0.5 .mu.m (inclusive) to 2 .mu.m (inclusive) with alumina having an average particle diameter in a range of 0.1 .mu.m (inclusive) to 1 .mu.m (exclusive) at a weight ratio of the tungsten to the alumina in a range of (90:10) to (65:35).

REFERENCES:
patent: 3823453 (1974-07-01), Van Stratum et al.
patent: 4009409 (1977-02-01), Buescher et al.

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