US3836805A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotating anode x-ray tube
Assignee: Philips North America LLC
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Filing: 1973-05-21
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Granted: 1974-09-17
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Expires: 1993-05-21
Abstract
Abstract A rotating anode x-ray tube employing a generally cylindrical anode which is axially moveable relative to the cathode so that the focal spot traverses a spiral path as the anode rotates and moves axially. The axial displacement of the anode can be controlled by the temperature of the focal spot, i.e. by measuring the light emitted from the focal spot area.
Inventors
- 👤 P Kok
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:00
CPC Classifications
H; H01; H01J; H01J35/00; H01J35/24; H01J35/28; H01J35/02; H01J35/04; H01J35/08; H01J35/10
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
100 words
An x-ray tube comprising an evacuated envelope, a generally cylindrical anode rotatable about a given axis within said envelope and moveable longitudinally therealong, a cathode for producing an electron beam which impinges on the surface of said anode forming a focal spot thereon where x-ray are generated which emerge from said envelope through an x-ray permeable window therein, means for rotating said anode and means for moving said anode longitudinally along said axis in response to the temperature at the focal spot to thereby present a fresh surface of the anode to the electron beam for producing the focal spot.
Claim 2
Dependent Claim
100 words
An x-ray tube comprising an evacuated envelope, a generally cylindrical anode rotatable about a given axis within said envelope and moveable longitudinally therealong, a cathode for producing an electron beam which impinges on the surface of said anode forming a focal spot thereon where x-ray are generated which emerge from said envelope through an x-ray permeable window therein, means for rotating said anode and means for moving said anode longitudinally along said axis in response to the temperature at the focal spot to thereby present a fresh surface of the anode to the electron beam for producing the focal spot.
Claim 3
Dependent Claim
25 words
An x-ray tube as claimed in claim 1 in which the focal spot moves in a spiral path in response to movement of the anode.
Claim 4
Dependent Claim
24 words
An x-ray tube as claimed in claim 1 in which the anode is cup-shaped and the cathode faces the outer surface of the cup.
Claim 5
Dependent Claim
24 words
An x-ray tube as claimed in claim 3 in which the anode is connected to a rotor which rotates about an axially moveable slide.
Claim 6
Dependent Claim
30 words
An x-ray tube as claimed in claim 4 in which the slide is moved by an axial drive mechanism which is actuated by means responsive to the focal spot temperature.
Claim 7
Dependent Claim
34 words
An x-ray tube as claimed in claim 5 in which the means responsive to the focal spot temperature is a member responsive to light emitted from the focal spot area inside the cup-shaped anode.
Claim 8
Dependent Claim
38 words
An x-ray tube as claimed in claim 5 in which the slide is coupled to the axial drive mechanism through a rack and pinion, the pinion being fixed by positioned and the rack being mounted on said slide.
Claim 9
Dependent Claim
19 words
An x-ray tube as claimed in claim 7 in which the rotor is journalled for rotation about the slide.
Claim 10
Dependent Claim
22 words
An x-ray tube as claimed in claim 8 in which the slide and rotor are mounted on said shaft by bearing means.
Claim 11
Dependent Claim
26 words
An x-ray tube as claimed in claim 9, in which said envelope includes an uninterrupted metal shield around the anode providing better safety from anode explosions.
References Cited (Backward Citations)
US2926270A
Cited
US3398307A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-16 | 1978-03-18 | 1978-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-16 | 1982-03-18 | 1982-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-16 | 1986-03-18 | 1986-09-17 | $7700.00 | Window Closed / Lapsed |