Patent US4464778A successfully refreshed from Google Patents.
US4464778A
Expired / Lapsed
US
⏱️ 0.0 years remaining
X-ray examination means
Assignee: Siemens AG
•
Filing: 1982-09-16
•
Granted: 1984-08-07
•
Expires: 2002-09-16
Abstract
Abstract An exemplary embodiment comprises an X-ray tube having at least two selectively engageable different focal points, a primary radiation diaphragm adjusted relative to the X-ray tube, and comprising an image layer. When changing the focal point, an adjustment of the primary radiation diaphragm occurs in prior X-ray tubes, the adjustment resulting in a displacement of the illuminated beam field on the image layer. The present disclosure provides that the diaphragm plates of the primary radiation diaphragm are synchronously displaced in the same direction and by approximately the same amount by which the focal point is displaced when switching from the one to the other focal point. An inventive X-ray examination system is particularly suited for employment in X-ray diagnostics.
Inventors
- 👤 Norbert Goldmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:32
CPC Classifications
H; H01; H01J; H01J35/00; H01J35/24; H01J35/26; A; A61; A61B; A61B6/00; A61B6/06; A61B6/40; A61B6/4021; G; G21; G21K; G21K1/00; G21K1/02; H05; H05G; H05G1/00; H05G1/02; H05G1/08; H05G1/26; H05G1/30; H05G1/52; H01J2235/00; H01J2235/08; H01J2235/086
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
97 words
X-ray examination means comprising an X-ray tube with at least two different, selectively engageable focal points (20, 31), comprising a primary radiation diaphragm having diaphragm plates for defining an X-ray beam produced by the X-ray tube, and comprising an image layer, characterized in shifting means for synchronously shifting the diaphragm plates (11, 12, 13, 14, 15, 35, 36, 37, 38, 39, 40, 41) of the primary radiation diaphragm (10, 33) in the same direction and by approximately the same amount by which the focal point is displaced when switching from the one to the other focal point.
Claim 2
Dependent Claim
97 words
X-ray examination means comprising an X-ray tube with at least two different, selectively engageable focal points (20, 31), comprising a primary radiation diaphragm having diaphragm plates for defining an X-ray beam produced by the X-ray tube, and comprising an image layer, characterized in shifting means for synchronously shifting the diaphragm plates (11, 12, 13, 14, 15, 35, 36, 37, 38, 39, 40, 41) of the primary radiation diaphragm (10, 33) in the same direction and by approximately the same amount by which the focal point is displaced when switching from the one to the other focal point.
Claim 3
Dependent Claim
79 words
X-ray examination means according to claim 1, characterized in that the shifting of the diaphragm plates by said shifting means is kept smaller than the focal point displacement effected by the change of focal point, being kept smaller approximately by the ratio of the spacing of the focal point from the diaphragm plates (11 through 15, 35 through 41) of the primary radiation diaphragm (10, 33) relative to the spacing of said diaphragm plates from the image layer (17).
Claim 4
Dependent Claim
39 words
X-ray examination means according to claim 1, with a mount (21) for the primary radiation diaphragm secured with the X-ray tube, characterized in that the shifting means shifts the entire primary radiation diaphragm (10) relative to said mount (21).
Claim 5
Dependent Claim
51 words
X-ray examination means according to claim 1, with a housing (34) for the primary radiation diaphragm (33) having a diaphragm plate carrier (44) carrying the diaphragm plates, characterized in that the diaphragm plate carrier (44) is displaced in the housing (34) of the primary radiation diaphragm (33) by said shifting means.
Claim 6
Dependent Claim
23 words
X-ray examination means according to claim 1 characterized in that said shifting means has stops for limiting the shifting of said diaphragm plates.
Claim 7
Dependent Claim
21 words
X-ray examination means according to claim 1, characterized in that said shifting means comprises a solenoid for shifting said diaphragm plates.
Claim 8
Dependent Claim
27 words
X-ray examination means according to claim 1, characterized in that the shifting means comprises an eccentric (49) which is rotatable to effect shifting of the diaphragm plates.
Claim 9
Dependent Claim
16 words
X-ray examination means according to claim 7, characterized in that the eccentric (49) is electromotively turned.
Claim 10
Dependent Claim
45 words
X-ray examination means according to claim 4, with said shifting means comprising motor drive means mounted in said housing and coupled with said diaphragm plate carrier for positively driving the diaphragm plates as a unit between respective positions corresponding to activation of respective focal points.
Claim 11
Dependent Claim
46 words
X-ray examination means according to claim 1, with adjustable stop means having a position of adjustment defining end positions of the diaphragm plates such that the defined X-ray beam covers substantially the same area of the image layer with each of the respective focal points active.
References Cited (Backward Citations)
US2497755A
Cited
US2942126A
Cited
DE2002634A1
Cited
US3733487A
Cited
US3857039A
Cited
US3934140A
Cited
US4097748A
Cited
US4145616A
Cited
DE2728998A1
Cited
DE2932042A1
Cited
US4329590A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-08-07 | 1988-02-06 | 1988-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-07 | 1992-02-06 | 1992-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-07 | 1996-02-06 | 1996-08-07 | $7700.00 | Window Closed / Lapsed |