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US 5,077,777 AGranted
Microfocus X-ray tube
AssigneeMicro Focus Imaging Corp.
InventorRichard H. Daly
Life of this patent
Estimating the term…
Abstract
A microfocus X-ray tube having an improved cathode assembly including a filament mounting disk for adjustably mounting a flat ribbon filament or a round wire filament such that the filament extends through an aperture in a focal plane disk which provides a uniform focusing field to the filament as well as a uniform heat sink surface.
Claims5
An X-ray tube comprising an evacuated envelope having terminal connectors extending into said envelope,
- a cathode assembly provided in said envelope, a filament for said cathode assembly for generating an electron beam, said filament formed of a length of flat ribbon, said length of flat ribbon being formed to have a folded tip in a central portion thereof, lengths of said ribbon extending on either side of tip and portions thereof being affixed to selected terminal connectors,
- a focal plane disk having a flat surface forming a focal plane assembly, said disk having a central aperture for receiving said tip of said filament,
- means connecting an electrical potential to said disk,
- an anode assembly provided in said envelope and facing said cathode assembly,
- target means positioned on said anode assembly to receive said electron beam and generate an X-ray beam in response thereto, said target means positioned to radiate said X-ray beam to form a selected field of radiation, said tip of said ribbon filament extending through said aperture to a position wherein the end of the tip is in the range of 0.003 to 0.005 inches past said focal plane towards said anode.
2 more elements
Dependencies are inferred from the claim text.