Sturdy oxide cathode for cathode ray tube

Details Sturdy oxide cathode for cathode ray tube Sturdy oxide cathode for cathode ray tube

1988-10-07

1990-03-27

Wieder, Kenneth

Electric lamp and discharge devices

With support and/or spacing structure for electrode and/or...

For indirectly heated cathode

313337, 445 51, H01J 126, H01J 904

Patent

active

049123629

ABSTRACT:
In thermoemissive cathodes for cathode ray tubes, in particular filament heated barium-calcium-strontium oxide cathodes, to give sturdiness to the filament and its alumina sheath in the presence of vibrations which might damage this sheath, it has been the practice to use an insulated reinforcing strip, soldered to the cathode tube, which restricts the movement of the filament during vibration. This method entails high manufacturing costs for mediocre results. The invention proposes to use a cathode, comprising a tube made of refractory metal closed by a refractory plug. The tube is filled with an alumina powder which is sintered before covering the plug with a standard emitting capsule of active nickel coated with metal oxides. The sintered alumina powder provides high cohesion between the filament and the inner wall of the tube. Excellent resistance to vibrations is obtained.

REFERENCES:
patent: 3005926 (1961-10-01), Horner et al.
patent: 3495121 (1970-02-01), Katz
patent: 3821589 (1974-06-01), Katz et al.
patent: 4611145 (1986-09-01), Kamuf et al.

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