US4413355A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary anode type X-ray tube
Assignee: Hitachi Ltd
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Filing: 1981-02-12
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Granted: 1983-11-01
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Expires: 2001-02-12
Abstract
Abstract A rotary anode type X-ray tube has an enclosure, a target rotatably supported within the enclosure and serving as a source of X-ray generation, a cylindrical rotor connected to the target, for rotating the target by the action of rotating magnetic field produced by a winding provided around the enclosure, a rotary shaft on the central axis of the rotor for rotation of the target, and a stationary cylindrical housing concentric with the rotor interposed between the rotor and the rotary shaft, for supporting the rotary shaft through rolling bearings. In this type of X-ray tube, means is interposed between the rotor and the rotary shaft, for reducing the difference of temperature between the stationary cylindrical housing and the rotor.
Inventors
- 👤 Toshio Matsumoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:52
CPC Classifications
H; H01; H01J; H01J35/00; H01J35/02; H01J35/04; H01J35/08; H01J35/10; H01J35/101; H01J35/1017; H01J35/1024; H01J2235/00; H01J2235/16; H01J2235/165; H01J2235/167
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
160 words
A rotary anode type X-ray tube having an enclosure, a target rotatably supported within the enclosure and serving as a source of X-ray generation, a cylindrical rotor connected to the target, for rotating the target by the action of rotating magnetic field produced by a winding provided around the enclosure, a rotary shaft on the central axis of the rotor for rotation of the target, and a stationary cylindrical housing concentric with the rotor interposed between the rotor and rotary shaft, for supporting the rotary shaft through rolling bearing means having inner and outer races, said X-ray tube having means interposed between said rotor and said rotary shaft for reducing the difference of temperature between the inner and outer races of said rolling bearing means to 50° C. or less comprising blackening surface treatment films formed on the opposed surfaces of said shaft mounting said inner race and the inner surface of said stationary cylindrical housing supporting said outer race.
Claim 2
Dependent Claim
160 words
A rotary anode type X-ray tube having an enclosure, a target rotatably supported within the enclosure and serving as a source of X-ray generation, a cylindrical rotor connected to the target, for rotating the target by the action of rotating magnetic field produced by a winding provided around the enclosure, a rotary shaft on the central axis of the rotor for rotation of the target, and a stationary cylindrical housing concentric with the rotor interposed between the rotor and rotary shaft, for supporting the rotary shaft through rolling bearing means having inner and outer races, said X-ray tube having means interposed between said rotor and said rotary shaft for reducing the difference of temperature between the inner and outer races of said rolling bearing means to 50° C. or less comprising blackening surface treatment films formed on the opposed surfaces of said shaft mounting said inner race and the inner surface of said stationary cylindrical housing supporting said outer race.
Claim 3
Dependent Claim
39 words
An X-ray tube as recited in claim 1, wherein said reducing means further includes in combination blackening surface treatment films respectively formed on an inner peripheral surface of said rotor and an outer peripheral surface of said stationary housing.
Claim 4
Dependent Claim
97 words
An X-ray tube as recited in claim 1, wherein said rotary shaft has a reduced diameter surface less than the inner diameter of said bearing for a substantial portion of its length to form a shoulder for seating one of said bearings, said rolling bearings supported by opposite ends of said sleeve mounted on said rotary shaft, and wherein said reducing means includes in combination blackening surface treatment films respectively formed on an inner peripheral surface of said stationary housing, inner and outer peripheral surfaces of said sleeve, and the reduced diameter surface of said rotary shaft.
Claim 5
Dependent Claim
24 words
An X-ray tube as recited in claim 1 2 or 3, wherein said blackening surface treatment film comprises a plating film of blackened chromium.
Claim 6
Dependent Claim
21 words
An X-ray tube as recited in claim 4, wherein the plating film has a thickness of from 1 to 5 microns.
Claim 7
Dependent Claim
27 words
An X-ray tube as recited in claim 2 or 3 which further comprises a blackening surface treatment film formed on an outer peripheral surface of said rotor.
Claim 8
Independent Claim
66 words
The method of maintaining temperature differential between the races of rolling bearings used to support the rotary shaft of the anode in a rotary anode X-ray tube to be substantially below 100° C. comprising the step of coated opposed surfaces of the rotor and the concentric stationary support for the outer race of said bearings with a film having heat radiation efficiency of 50% or greater.
Claim 9
Independent Claim
66 words
The method of maintaining temperature differential between the races of rolling bearings used to support the rotary shaft of the anode in a rotary anode X-ray tube to be substantially below 100° C. comprising the step of coated opposed surfaces of the rotor and the concentric stationary support for the outer race of said bearings with a film having heat radiation efficiency of 50% or greater.
Claim 10
Dependent Claim
51 words
The method according to claim 7 wherein said film on the inner surface of said rotor has a heat radiation efficiency of 65% and said film opposed thereto on the center surface of said stationary support has a heat radiation efficiency of 80% to make said temperature differential approximately 15° C.
References Cited (Backward Citations)
US2081789A
Cited
US4097759A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-10-31 | 1987-05-02 | 1987-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-31 | 1991-05-02 | 1991-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-31 | 1995-05-02 | 1995-11-01 | $7700.00 | Window Closed / Lapsed |