Fluoroescent display panel having indirectly-heated cathode

Details Fluoroescent display panel having indirectly-heated cathode Fluoroescent display panel having indirectly-heated cathode

1985-12-13

1988-11-29

Moore, David K.

Electric lamp and discharge devices

With luminescent solid or liquid material

Vacuum-type tube

313491, 313340, H01J 124, H01J 6106

Patent

active

047884720

ABSTRACT:
A fluoroescent display panel has at least one indirectly heated cathode which is easy to manufacture, at a low cost. The cathode produces a uniformly lit display across the entire read out. An indirectly heated cathode comprises a metal sleeve having a layer of electron emissive material. A heating wire passes through the metal sleeve. The metal sleeve and the heating wire are electrically isolated from each other by an insulative layer on the heating wire, except at one portion where the metal sleeve and the heating wire are mechanically and electrically connected to each other.

REFERENCES:
patent: 4100449 (1978-07-01), Gange
patent: 4123687 (1978-10-01), Poirier et al.
patent: 4468589 (1984-08-01), Hikida

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