Cylindrical cathode with segmented electron emissive surface and method of manufacture
AssigneeVarian Associates, Inc.
InventorRobert N. Tornoe
Life of this patent
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Abstract
A new method of fabricating a cylindrical segmented cathode by bending a photoetched bar-band to form a cylindrically-shaped cage and slipping it over a cylindrical electron emissive surface which will tightly fit inside the cage when the cathode is raised to its normal temperature. The bars of the band provide nonemissive segments of the cathode surface.
Claims13
A method of fabricating a cylindrical cathode with a segmented external surface with electron emitting and nonemitting areas, said method comprising the steps of:
- fabricating an inner structure having a cylindrically-shaped thermionic electron emitting surface and an apertured cylindrical shell which can slideably contain said electron emitting surface, and
- sliding said shell over said electron emitting surface.
A cylindrical segmented cathode comprising a support member having a circular outer surface, a coating of electron emissive material entirely around said outer surface, an apertured slideably fitted cylindrical shell of nonemissive material, and said shell being positioned around and electricaly connected to said emissive material.
Dependencies are inferred from the claim text.