US3719846A - X-ray tube - Google Patents
X-ray tube Download PDFInfo
- Publication number
- US3719846A US3719846A US00104968A US3719846DA US3719846A US 3719846 A US3719846 A US 3719846A US 00104968 A US00104968 A US 00104968A US 3719846D A US3719846D A US 3719846DA US 3719846 A US3719846 A US 3719846A
- Authority
- US
- United States
- Prior art keywords
- envelopes
- cathode
- anode
- pair
- electron beam
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J35/00—X-ray tubes
- H01J35/24—Tubes wherein the point of impact of the cathode ray on the anode or anticathode is movable relative to the surface thereof
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J35/00—X-ray tubes
- H01J35/02—Details
- H01J35/04—Electrodes ; Mutual position thereof; Constructional adaptations therefor
Definitions
- ABSTRACT The invention relates to an X-ray tube in which the anode and the cathode are accommodated in two parallel adjacent evvelopes which are interconnected by a tubular member through which the electron beam passes. At high voltage (300 kV and higher) the direction of the electron beam and the direction of the maximum of the X-rays are inclined at an obtuse angle to one another. Thus the electrons impinge on the target nearly at grazing incidence.
- the two envelopes are relatively movable, causing substantially a deformation of the couplingmember only which is capable of deformation owing to the use of an appropriate construction and/or a suitable material.
- the invention relates to an X-ray tube, in particular a tube for voltages of 300 kV and higher the anode and cathode of which are accommodated in one of two parallel adjacent envelopes, the electron beam'passing from the cathode to the anode through a tube coupling the envelopes.
- an X-ray tube is known.
- the particular advantage of this construction consists in that it enables the high voltage cables for the anode and the cathode to be brought in from the same side with consequent ease in handling the tube.
- the Figure shows a casing l of an X-ray apparatus which contains two grounded envelopes 2 and 3 for the anode 4 and the cathode 5 which are mounted on insulators 6 and 7 respectively which are secured in a vacuumtight manner to the envelopes 2 and 3 respectively and have cavities 8 and 9 respectively for the respective high-voltage plugs.
- the envelopes 2 and 3 advantageously each consist of a hollow cylinder one end of which is closed by means of a hollow hemispherical member and into the other end of which the respective insulator has been inserted.
- the two envelopes are interconnected by a coupling tube 10, through which the electron beam passes from the cathode space into the anode space.
- the electron beam 11 and the direction 12 of the maximum of the X-rays make an obtuse angle of, for example, 145 or considering the angle between the imaginary continuation of the electron beam and the maximum an acute angle of 35.
- the target 13 in the anode 4 may not be inclined at an angle of more than 45a to the electron beam, since otherwise the X-rays in the direction of the maximum will be absorbed by the target.
- the angle must be even smaller, because the X- rays about the maximum are also to be utilized. If, for example, an X-ray cone which has a vertical angle of 40 and in the axis of the maximum is to permit full utilization of the X-rays, the angle should be only 35 20 15. With so small an angle even the smallest tolerances, which are substantially unavoidable in manufacture, will cause a comparatively large shift of the focal spot.
- the invention permits a considerable cancellation of this shift.
- the X-ray tube is designed so that in order to displace the focal spot on the target 13 the envelopes 2 and 3 are capable of relative movement in which substantially only the coupling tube 10 is deformed.
- the adjustment made possible by this construction is effected after the assembly of the envelopes, i.e., after the insulators 6 and 7 for the anode 4 and the cathode 5 have been mounted in the envelopes 2 and 3 respectively and after the two halves of the coupling tube 10 have been welded or soldered to one another.
- the cathode envelope only is moved whilst the anode envelope is fixed so as to prevent a change in its position relative to the X-ray exit window.
- the anode envelope may be secured, for example, by bolts, not shown, which draw a flange 15 of an anode insulator 6 against a mounting plate 17 which is welded to the casing l and has openings for receiving the anode and cathode envelopes, until a flange l8 welded to the envelope 2 is firmly pressed against the mounting plate 17 throughout its entire surface area.
- the cathode envelope 3 is best adjusted with the high voltage switched on so that the location of the focal spot on the target 13 may be checked through the X- ray exit window; the means of adjustment are not shown in detail.
- a correction may simply be effected by slightly rotating the cathode envelope 3 about its axis.
- the required adjustment may be performed by tilting the cathode envelope (with respect to its central axis).
- three bolts may be used which are mutually displaced at angles of and press against the envelope 3 in radial directions at the level indicated by the arrow 20 and may be tightened by means of screwthread formed in the casing 1.
- the cathode envelope together with the cathode may be tilted to the left or to the right, enabling the electron beam and hence the focal spot to be shifted upwardly or downwardly respectively.
- a flange l9 welded to the envelope 3 bolts which are screwed against the mounting plate 17 so that the flange 19 bears on the mounting plate 17 at several points and the adjusted relative positions of the two envelopes are maintained.
- the deformation of the coupling tube 10 alone due to the adjustment is obtainable by the use of a suitable material, by the choice of the wall thickness or by appropriate shaping.
- the coupling tube 10 may be a concertina or bellows.
- the said properties are obtained in that the coupling tube 10 comprises two halves 10a and 1012 which are welded to the envelopes 2 and 3, respectively, and are flanged over at the ends facing one another and are joined to one another by butt welding.
- the use of the invention is not restricted to tubes of metal-ceramic construction but it may also be used for X-ray tubes of known metal-glass construction in an appropriate insulating medium.
- An X-ray tube including a base, an X-ray exit window, an anode and a cathode comprising a pair of envelopes open at one end and having side walls adjacent and substantially parallel to each other, one of said envelopes being positioned around said anode and the other of said envelopes being positioned around said cathode, a deformable sleeve interconnecting adjacent portions of said side walls of said pair of envelopes and forming a continuum of space from said one of said envelopes to the said other of said envelopes whereby an electron beam can pass therethrough from said cathode to said anode, a target disposed within said anode and having at least one flat surface positioned with respect to the angle of incidence of said electron beam at less a respective one of said pair of insulators, whereby said electron beam can be directed to a spot on said flat surface which directs substantially all of said X-rays out of said X-ray exit window upon said insulator supporting said cathode being tilted and said deform
Landscapes
- X-Ray Techniques (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2008782 | 1970-02-25 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3719846A true US3719846A (en) | 1973-03-06 |
Family
ID=5763331
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00104968A Expired - Lifetime US3719846A (en) | 1970-02-25 | 1971-01-08 | X-ray tube |
Country Status (4)
Country | Link |
---|---|
US (1) | US3719846A (fr) |
JP (1) | JPS5121555B1 (fr) |
FR (1) | FR2078899A5 (fr) |
GB (1) | GB1302826A (fr) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4126803A (en) * | 1974-10-11 | 1978-11-21 | Licentia Patent-Verwaltungs-G.M.B.H. | X-ray tube and apparatus including an X-ray tube |
EP0009946A1 (fr) * | 1978-10-02 | 1980-04-16 | Pfizer Inc. | Tube à rayons X |
WO1992003837A1 (fr) * | 1990-08-24 | 1992-03-05 | Michael Danos | Tube a rayons x |
US5206895A (en) * | 1990-08-24 | 1993-04-27 | Michael Danos | X-ray tube |
EP1146542A1 (fr) * | 2000-04-11 | 2001-10-17 | General Electric Company | Apparei et procédé pour augmenter la puissance d'un tube à rayons X par charge thermique de la cible |
US6421422B1 (en) | 1999-08-25 | 2002-07-16 | General Electric Company | Apparatus and method for increasing X-ray tube power per target thermal load |
US20130322601A1 (en) * | 2012-06-03 | 2013-12-05 | Satpal Singh | Low focal height x-ray generator suitable for inspection of objects close to ground |
US11103207B1 (en) | 2017-12-28 | 2021-08-31 | Radiation Monitorng Devices, Inc. | Double-pulsed X-ray source and applications |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11365791B1 (en) | 2020-12-04 | 2022-06-21 | Schaeffler Technologies AG & Co. KG | Ball nut drive assembly |
-
1971
- 1971-01-08 US US00104968A patent/US3719846A/en not_active Expired - Lifetime
- 1971-02-22 JP JP46008073A patent/JPS5121555B1/ja active Pending
- 1971-02-22 FR FR7105939A patent/FR2078899A5/fr not_active Expired
- 1971-04-19 GB GB2229871A patent/GB1302826A/en not_active Expired
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4126803A (en) * | 1974-10-11 | 1978-11-21 | Licentia Patent-Verwaltungs-G.M.B.H. | X-ray tube and apparatus including an X-ray tube |
EP0009946A1 (fr) * | 1978-10-02 | 1980-04-16 | Pfizer Inc. | Tube à rayons X |
WO1992003837A1 (fr) * | 1990-08-24 | 1992-03-05 | Michael Danos | Tube a rayons x |
US5128977A (en) * | 1990-08-24 | 1992-07-07 | Michael Danos | X-ray tube |
US5206895A (en) * | 1990-08-24 | 1993-04-27 | Michael Danos | X-ray tube |
US6421422B1 (en) | 1999-08-25 | 2002-07-16 | General Electric Company | Apparatus and method for increasing X-ray tube power per target thermal load |
EP1146542A1 (fr) * | 2000-04-11 | 2001-10-17 | General Electric Company | Apparei et procédé pour augmenter la puissance d'un tube à rayons X par charge thermique de la cible |
US20130322601A1 (en) * | 2012-06-03 | 2013-12-05 | Satpal Singh | Low focal height x-ray generator suitable for inspection of objects close to ground |
US11103207B1 (en) | 2017-12-28 | 2021-08-31 | Radiation Monitorng Devices, Inc. | Double-pulsed X-ray source and applications |
Also Published As
Publication number | Publication date |
---|---|
JPS5121555B1 (fr) | 1976-07-03 |
FR2078899A5 (fr) | 1971-11-05 |
GB1302826A (fr) | 1973-01-10 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
KR102584667B1 (ko) | 컴팩트한 이온화 선 생성 소스, 복수의 소스들을 포함하는 어셈블리 및 그 소스를 제조하는 방법 | |
US1211092A (en) | X-ray tube. | |
EP0168641A2 (fr) | Tube à rayons X | |
US3780334A (en) | Vacuum tube for generating a wide beam of fast electrons | |
US3719846A (en) | X-ray tube | |
CN110504147B (zh) | 一种用于空间x射线通信基于能量负载信号的x射线源 | |
JP2934707B2 (ja) | 走査電子顕微鏡 | |
US3735190A (en) | Color cathode ray tube | |
US2935636A (en) | Electron gun structure | |
US4798957A (en) | Electron beam apparatus comprising an anode which is included in the cathode/Wehnelt unit | |
KR102584668B1 (ko) | 이온화 선을 생성하기 위한 컴팩트한 소스 | |
US1717309A (en) | X-ray tube | |
US3391295A (en) | Electron system for convergence of electrons from photocathode having curvature in asingle plane | |
US3683194A (en) | Electron optics for a minifying image tube | |
US3579010A (en) | Elongated aperture electron gun structure for flat cathode-ray tube | |
JPH043384Y2 (fr) | ||
US3303345A (en) | Image amplifier with magnification grid | |
GB1417452A (en) | Image tube employing high field electron emission suppression | |
US3714487A (en) | X-ray tube having external means to align electrodes | |
US4161671A (en) | X-ray tube | |
US3443104A (en) | Image intensifier tube with shading compensation | |
US3124710A (en) | X-ray tubes | |
US4173727A (en) | Electron image device | |
US2931903A (en) | Acceleration and application of high intensity electron beams for radiation processing | |
US3107311A (en) | X-ray tube with focusing means at the cathode |