US4651336A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotating-anode X-ray tube
Assignee: Thales SA
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Filing: 1984-04-27
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Granted: 1987-03-17
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Expires: 2004-04-27
Abstract
Abstract In an X-ray tube comprising a rotating anode mounted on magnetic bearings, the flow of anode current within the tube takes place without any contact by means of a stationarily fixed hollow anode in which is placed a cathode coupled rotationally to the rotating anode. The hollow anode is associated with heating means and the cathode is heated by thermal radiation within the hollow anode.
Inventors
- 👤 Jacques Le Guen
- 👤 Andre Plessis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:09
CPC Classifications
H; H01; H01J; H01J35/00; H01J35/02; H01J35/04; H01J35/08; H01J35/10; H01J35/101; H01J35/1017; H01J35/103
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
108 words
A rotating-anode x-ray tube comprising a rotating anode mounted on magnetic bearings and at least one device for passing the anode current of the X-ray tube between a positive pole of a high-voltage supply and the rotating anode, wherein said device comprises a stationarily fixed hollow anode within which a cathode is rotationally mounted and mechanically fixidly coupled to said rotating anode, the hollow anode being surrounded by a heating filament for heating said anode, said hollow anode being adapted to be connected to a positive pole of the high-voltage supply, and the chathode being electrically connected to the rotating anode so as to pass the anode current.
Claim 2
Dependent Claim
108 words
A rotating-anode x-ray tube comprising a rotating anode mounted on magnetic bearings and at least one device for passing the anode current of the X-ray tube between a positive pole of a high-voltage supply and the rotating anode, wherein said device comprises a stationarily fixed hollow anode within which a cathode is rotationally mounted and mechanically fixidly coupled to said rotating anode, the hollow anode being surrounded by a heating filament for heating said anode, said hollow anode being adapted to be connected to a positive pole of the high-voltage supply, and the chathode being electrically connected to the rotating anode so as to pass the anode current.
Claim 3
Dependent Claim
17 words
An x-ray tube according to claim 1, wherein the heating filament is surrounded by a thermal reflector.
Claim 4
Dependent Claim
47 words
An x-ray tube according to claim 1, wherein the heating means further comprise a low-voltage generator which cooperates with the heating filament and the hollow anode in order to produce between said filament and said anode a potential difference which permits electron bombardment of said hollow anode.
Claim 5
Dependent Claim
27 words
An x-ray tube according to claim 1, wherein the hollow anode constitutes a practically closed chamber which performs the function of a furnace for heating the cathode.
Claim 6
Dependent Claim
14 words
An x-ray tube according to claim 1, wherein the cathode is of hollow construction.
Claim 7
Dependent Claim
42 words
An x-ray tube according to claim 1, wherein the hollow anode and the cathode have shapes so designed as to ensure that the internal and external surfaces respectively of said anode and cathode are located at a constant distance from each other.
Claim 8
Dependent Claim
20 words
An x-ray tube according to claim 1, wherein the hollow anode and the cathode have the shape of a sphere.
Claim 9
Dependent Claim
18 words
An x-ray tube according to claim 1, wherein the hollow anode and the cathode have a cylindrical shape.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-03-16 | 1990-09-15 | 1991-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-16 | 1994-09-15 | 1995-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-16 | 1998-09-15 | 1999-03-17 | $7700.00 | Window Closed / Lapsed |