US4068127A
Expired / Lapsed
US
⏱️ 0.0 years remaining
X-ray generating apparatus comprising means for rotating the filament
Assignee: United States Department of Health and Human Services
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Filing: 1976-07-08
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Granted: 1978-01-10
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Expires: 1996-07-08
Abstract
Abstract An X-ray apparatus provides rotationally symmetric, Gaussian-like focal spot distributions. The apparatus may be constituted by an X-ray tube having a glass envelope, a cathode in the form of a filament for providing thermionically emitted electrons and an anode. The anode is of conical shape and can be rotated. The cathode is arranged to be rotated about an axis perpendicular to the plane of the filament and passing through its central point. The apparatus may be constituted by a conventional X-ray tube which is rotatable about an axis coaxial with the central ray of the X-ray field which emerges from the tube. The apparatus may be constituted by a conventional X-ray tube, which is stationary, in combination with a mechanism which effects rotation of the X-ray image receptor and the object being to be examined about an axis coaxial with the central ray of the X-ray field.
Inventors
- 👤 David J. Goodenough
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:54
CPC Classifications
H; H01; H01J; H01J35/00; H01J35/02; H01J35/04; H01J35/08; H01J35/10; H01J35/06; H01J35/064
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
83 words
An X-ray apparatus comprising an envelope, an anode, a cathode and means for providing a rotationally symmetric, Gaussian-like focal spot distribution, wherein said cathode is a filament having a central point and being positioned in a given plane, wherein said means for providing a rotationally symmetric, Gaussian-like focal spot distribution comprises means for rotating said filament in said given plane about said central point, and wherein said means for rotating effects an integral number of revolutions of said filament during an exposure interval.
Claim 2
Dependent Claim
83 words
An X-ray apparatus comprising an envelope, an anode, a cathode and means for providing a rotationally symmetric, Gaussian-like focal spot distribution, wherein said cathode is a filament having a central point and being positioned in a given plane, wherein said means for providing a rotationally symmetric, Gaussian-like focal spot distribution comprises means for rotating said filament in said given plane about said central point, and wherein said means for rotating effects an integral number of revolutions of said filament during an exposure interval.
Claim 3
Dependent Claim
27 words
An X-ray apparatus according to claim 1, wherein said means for rotating effects at least ten revolutions of said filament in said plane during an exposure interval.
Claim 4
Dependent Claim
25 words
An X-ray apparatus according to claim 1, wherein said means for rotating effects at least one complete revolution of said filament during an exposure interval.
Claim 5
Dependent Claim
22 words
An X-ray apparatus according to claim 1, wherein said filament is carried on a stem, said stem being rotatable within said envelope.
Claim 6
Dependent Claim
29 words
An X-ray apparatus according to claim 4, wherein said means for rotating include magnet means fixed to said stem and induction coil means fixedly positioned adjacent said magnet means.
Claim 7
Dependent Claim
80 words
An X-ray apparatus comprising an envelope, an anode, a cathode and means for providing a rotationally symmetric, Gaussian-like focal spot distribution, wherein said cathode is a filament having a central point and being positioned in a given plane, wherein said means for providing a rotationally symmetric, Gaussian-like focal spot distribution comprises means for rotating said filament in said given plane about said central point, and wherein said filament is carried on a stem, said stem being rotatable within said envelope.
Claim 8
Dependent Claim
80 words
An X-ray apparatus comprising an envelope, an anode, a cathode and means for providing a rotationally symmetric, Gaussian-like focal spot distribution, wherein said cathode is a filament having a central point and being positioned in a given plane, wherein said means for providing a rotationally symmetric, Gaussian-like focal spot distribution comprises means for rotating said filament in said given plane about said central point, and wherein said filament is carried on a stem, said stem being rotatable within said envelope.
Claim 9
Dependent Claim
29 words
An X-ray apparatus according to claim 6, wherein said means for rotating include magnet means fixed to said stem and induction coil means fixedly positioned adjacent said magnet means.
Claim 10
Dependent Claim
27 words
An X-ray apparatus according to claim 6, wherein said means for rotating effects at least ten revolutions of said filament in said plane during an exposure interval.
Claim 11
Dependent Claim
25 words
An X-ray apparatus according to claim 6, wherein said means for rotating effects at least one complete revolution of said filament during an exposure interval.
Claim 12
Dependent Claim
25 words
An X-ray apparatus according to claim 6, wherein said means for rotating effects an integral number of revolutions of said filament during an exposure interval.
Claim 13
Dependent Claim
80 words
An X-ray apparatus comprising: an envelope; an anode positioned within said envelope; a cathode positioned within said envelope, said cathode being a filament having two ends to which filament current supplying connections are made and a central point midway between said ends, and being positioned in a given plane; and means for providing a rotationally symmetric, Gaussian-like focal spot distribution, said means including means for rotating said filament, relative to said envelope, in said given plane about said central point.
Claim 14
Dependent Claim
80 words
An X-ray apparatus comprising: an envelope; an anode positioned within said envelope; a cathode positioned within said envelope, said cathode being a filament having two ends to which filament current supplying connections are made and a central point midway between said ends, and being positioned in a given plane; and means for providing a rotationally symmetric, Gaussian-like focal spot distribution, said means including means for rotating said filament, relative to said envelope, in said given plane about said central point.
Claim 15
Dependent Claim
27 words
An X-ray apparatus according to claim 11, wherein said means for rotating effects at least ten revolutions of said filament in said plane during an exposure interval.
Claim 16
Dependent Claim
25 words
An X-ray apparatus according to claim 11, wherein said means for rotating effects at least one complete revolution of said filament during an exposure interval.
Claim 17
Dependent Claim
25 words
An X-ray apparatus according to claim 11, wherein said means for rotating effects an integral number of revolutions of said filament during an exposure interval.
Claim 18
Dependent Claim
29 words
An X-ray apparatus according to claim 11, wherein said means for providing a rotationally symmetric Gaussian-like distribution includes at least one focusing coil positioned in proximity to said filament.
Claim 19
Dependent Claim
22 words
An X-ray apparatus according to claim 11, wherein said filament is carried on a stem, said stem being rotatable within said envelope.
Claim 20
Dependent Claim
29 words
An X-ray apparatus according to claim 16, wherein said means for rotating include magnet means fixed to said stem and induction coil means fixedly positioned adjacent said magnet means.
Claim 21
Dependent Claim
41 words
An X-ray apparatus according to claim 11, wherein said means for providing a rotationally symmetric, Gaussian-like focal spot distribution includes a mask connected to a point of reference potential and provided with an aperture positioned with said aperture adjacent said filament.
Claim 22
Dependent Claim
27 words
An X-ray apparatus according to claim 18, wherein said means for providing a rotationally symmetric Gaussian-like distribution includes at least one focusing coil positioned about said aperture.
References Cited (Backward Citations)
US2493606A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-01-09 | 1981-07-11 | 1982-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-09 | 1985-07-11 | 1986-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-09 | 1989-07-11 | 1990-01-10 | $7700.00 | Window Closed / Lapsed |