X-ray tube having focusing cup with non-emitting coating

Details X-ray tube having focusing cup with non-emitting coating X-ray tube having focusing cup with non-emitting coating

1977-01-27

1979-08-21

Rolinec, Rudolph V.

Electric lamp and discharge devices

With radioactive material

313 60, H01J 3500

Patent

active

RE0300829

ABSTRACT:
An x-ray tube is described including a focusing cup electrode coated with a high work function material, such as platinum or gold, to prevent the field emission of electrons from such cup. The method of applying the non-emitting coating is preferably sputtering or ion plating, but may also be electroplating followed by vacuum fusion in the case of gold or other low melting point metals.

REFERENCES:
patent: 2671867 (1954-03-01), Atlee

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