Electron tube comprising a semiconductor cathode
AssigneeKoninklijke Philips Electronics N.V.
InventorsFrederik C. Gehring, Ron Kroon, Tom Van Zutphen
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Abstract
An electron tube provided with a semiconductor cathode for emitting electrons, which semiconductor cathode is arranged on a support, a source being arranged in the vicinity of the cathode, in particular, so as to face the free (Si) surface of the cathode, which source is capable of evolving, at the increased temperatures occurring during evacuation of the tube in the manufacturing process, a reducing agent such as F2 or HF, which passivates the free (Si) surface of the cathode.
Claims19
An electron tube having an evacuated space, and comprising a support and a semiconductor cathode for emitting electrons arranged on the support in said space,
- wherein the electron tube further comprises means, responsive to increased temperatures, for evolving a reducing agent, said means for evolving comprising a source arranged in the vicinity of the cathode.
An electron tube comprising a support and a semiconductor cathode for emitting electrons arranged on the support,
- wherein the electron tube further comprises a source of reducing agent arranged in the vicinity of the cathode, said source evolving a reducing agent at increased temperatures, said reducing agent being a member selected from the group consisting of fluorine and hydrogen fluoride.
Dependencies are inferred from the claim text.