Low mass, indirectly heated, fast warm-up heater-cathode assembl

Details Low mass, indirectly heated, fast warm-up heater-cathode assembl Low mass, indirectly heated, fast warm-up heater-cathode assembl

1978-04-17

1979-04-17

Smith, Alfred E.

Electric lamp and discharge devices

Electrode and shield structures

Indirectly heated cathodes

313346R, H01J 124

Patent

active

041503180

ABSTRACT:
A substrate of substantially pure, hexagonal crystal, .alpha. alumina (sapphire) has a central hub and three radiating spokes. One surface of the substrate has a metallized cathode base thereon and the opposite surface is provided with a metallized heater. Electrical connection to the cathode base and heater are provided via the spokes, which are also appropriately metallized. A suitable electron emissive material is applied to the cathode base.

REFERENCES:
patent: 3881124 (1975-04-01), Buescher et al.
patent: 3947715 (1976-03-01), Puhak
patent: 3958146 (1976-05-01), Buescher et al.
patent: 4009409 (1977-02-01), Buescher et al.

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