EP0330912A1 - Röntgenröhre mit Drehanode - Google Patents

Röntgenröhre mit Drehanode Download PDF

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Publication number
EP0330912A1
EP0330912A1 EP89102592A EP89102592A EP0330912A1 EP 0330912 A1 EP0330912 A1 EP 0330912A1 EP 89102592 A EP89102592 A EP 89102592A EP 89102592 A EP89102592 A EP 89102592A EP 0330912 A1 EP0330912 A1 EP 0330912A1
Authority
EP
European Patent Office
Prior art keywords
anode plate
ray tube
anode
vacuum housing
tube according
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.)
Withdrawn
Application number
EP89102592A
Other languages
German (de)
English (en)
French (fr)
Inventor
Arthur Dipl.-Ing. Gall
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP0330912A1 publication Critical patent/EP0330912A1/de
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • H01J35/08—Anodes; Anti cathodes
    • H01J35/10—Rotary anodes; Arrangements for rotating anodes; Cooling rotary anodes
    • H01J35/101—Arrangements for rotating anodes, e.g. supporting means, means for greasing, means for sealing the axle or means for shielding or protecting the driving
    • H01J35/1017—Bearings for rotating anodes
    • H01J35/1024—Rolling bearings
    • 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
    • H01J35/08—Anodes; Anti cathodes
    • H01J35/10—Rotary anodes; Arrangements for rotating anodes; Cooling rotary anodes
    • H01J35/105—Cooling of rotating anodes, e.g. heat emitting layers or structures

Definitions

  • the invention relates to an X-ray tube with a cathode accommodated in a vacuum housing and a rotating anode, which has an anode plate, a body made of heat-conducting material associated therewith and a drive shaft which is provided with bearings which are supported on the vacuum housing.
  • X-ray tubes of this type are used, in particular, where the X-ray tubes are required to withstand high thermal loads.
  • Such an X-ray tube is described in DE-PS 3 004 706, in which the rotating anode of the X-ray tube consists of an anode plate, on the underside of which a body made of graphite for heat radiation is attached.
  • the moment of inertia of the anode increases undesirably due to the additional weight of the body, so that time is lost especially when starting or when switching from one speed to another, so that such an X-ray tube does not close is available at all times.
  • the invention has for its object to provide an X-ray tube of the type mentioned, which rejects only a small moment of inertia with high heat storage capacity and heat radiation.
  • the object is achieved in that the anode plate and the body are arranged separately in the vacuum housing, and that the body with its side facing the anode plate is held at a short distance from the underside of the anode plate via bearings mounted on the drive shaft. It is achieved that the moment of inertia is very small is because only the anode plate has to be accelerated to actually drive the X-ray tube.
  • the X-ray tube of this type has a high heat storage capacity since, due to the small distance from the anode plate to the body, at least at higher temperatures, the heat of the anode plate is transferred to the body, which stores and radiates the heat.
  • the body can run freely, that is, by rotating the anode, the body is slowly carried along until it has almost the speed of rotation of the anode plate, so that very close contact of the body with the anode plate can be achieved.
  • the heat transfer from the anode plate to the body can be increased if the facing surfaces of the anode plate and the body are provided with at least one heat transfer plate.
  • the area for heat dissipation of the anode plate on the body is increased so that a greater heat emission can take place if the anode plate and / or the body is provided with at least one concentric ring which engages in a corresponding, concentric recess of the body or the anode plate .
  • a rotation of the body can be prevented if holding means are provided which lock the body in relation to the vacuum housing. It has proven to be advantageous if drive means are provided which rotate the body against the direction of rotation of the anode plate.
  • FIG. 1 shows a known X-ray tube 1 with a vacuum housing 2, for example consisting of glass.
  • a vacuum housing 2 for example consisting of glass.
  • the vacuum housing 2 there is a cathode 3 and an anode 4, which has an anode plate 5 and a body 6 fastened to it, which is made of a material that is capable of storing and radiating heat, for example graphite.
  • the anode 4 is connected via a drive shaft 7 to the rotor 8 of the X-ray tube 1, which is rotatably fastened to the vacuum housing 2 via bearings (not shown).
  • the stator 9 surrounds the vacuum housing 2 of the X-ray tube 1.
  • the cathode 3 has a heating coil 10 as a hot cathode, which is connected to the voltage supply via leads 11 and 12. Electron beams 13 emerge from the heating coil 10, which impinge on the focal spot path of the anode plate 5 and generate an X-ray beam 14.
  • FIG. 2 shows an embodiment of an anode 4 according to the invention.
  • the anode plate 5 of the anode 4 is connected to the drive shaft 7.
  • the body 6 On the drive shaft 7, the body 6 is held by ball bearings 15 and 16, which is located with its flat surface near the underside of the anode plate 5, so that a small gap 17 is formed between the anode plate 5 and the body 6.
  • the anode 4 starts up, only the rotor 8, the drive shaft 7 and the anode plate 5 have to be moved while the body 6 remains at rest due to the ball bearings 15 and 16.
  • the anode plate 5 When the anode plate 5 is loaded, it emits the heat to the body 6 through the gap 17 by heat radiation.
  • the body 6 stores the heat in a known manner and radiates it to the outside.
  • the body 6 and / or the anode plate 5 can each be provided with a heat transfer plate 18 and 19, between which the gap 17 is located.
  • the body 6 can run freely on the drive shaft 7 via the ball bearings 15 and 16. However, as shown in FIG. 2, it can also be fixed in its position by holding means.
  • Two magnets 20 and 21 can be used as holding means, of which the magnet 20 is embedded in the body 6 and the outer magnet 21 is fastened to the vacuum housing 2.
  • the body 6 is held by the attraction of the magnets 20 and 21.
  • the body 6 can also be set in motion by drive means, which are not shown in this case. The movement can be effected in the same direction as that of the anode plate 5 or in the opposite direction.
  • FIG. 3 shows two further embodiments of the anode 4 according to the invention.
  • the side of the body 6 facing the anode plate 5 is provided with concentric rings 22, which are connected to the body 6 with good thermal conductivity and engage in corresponding, concentrically arranged depressions 23 in the anode plate 5.
  • the rings 22 are also at a distance in the size of the gap 17 from the side walls of the recesses 23. This results in an enlarged radiation area of the anode plate 5, so that the heat transfer from the anode plate 5 to the body 6 is facilitated.
  • the heat transfer can also be facilitated if, according to the illustration shown in FIG. 3 on the right of the center line 27, concentric rings 24 are attached to the anode plate 5 and are connected to it with good thermal conductivity. These rings 24 engage in corresponding concentric depressions 25 and are at a distance from the side walls of the depressions 25 which corresponds to the size of the gap 17. Furthermore, the body 6, as shown in FIG. 3, can be provided with a collar 26 which surrounds the lower part of the anode plate 5. This also increases the usable area for heat transfer, so that the heat of the anode plate 5 can be transferred to the body 6 more easily.
  • X-ray tubes 1 are obtained whose anodes have only a low moment of inertia, which is determined only by the anode plate 5, the drive shaft 7 and the rotor 8. With respect to the heat storage capacity and heat radiation capability, however, such an x-ray tube 1 has almost the values that an x-ray tube with an anode 4 would have, in which the body 6 is firmly attached to the anode plate 5. This gives an X-ray tube 1 with a low moment of inertia and high heat storage and heat radiation capability.

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  • X-Ray Techniques (AREA)
EP89102592A 1988-03-02 1989-02-15 Röntgenröhre mit Drehanode Withdrawn EP0330912A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8802804U DE8802804U1 (de) 1988-03-02 1988-03-02 Röntgenröhre mit Drehanode
DE8802804U 1988-03-02

Publications (1)

Publication Number Publication Date
EP0330912A1 true EP0330912A1 (de) 1989-09-06

Family

ID=6821362

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89102592A Withdrawn EP0330912A1 (de) 1988-03-02 1989-02-15 Röntgenröhre mit Drehanode

Country Status (3)

Country Link
EP (1) EP0330912A1 (zh)
JP (1) JPH0231054U (zh)
DE (1) DE8802804U1 (zh)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2675627A1 (fr) * 1991-04-17 1992-10-23 Gen Electric Cgr Ensemble anodique a grille pour tube a rayons x et tube ainsi obtenu.
DE102012208513A1 (de) 2012-05-22 2013-11-28 Siemens Aktiengesellschaft Röntgenröhre

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8802804U1 (de) * 1988-03-02 1988-04-21 Siemens AG, 1000 Berlin und 8000 München Röntgenröhre mit Drehanode

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3790836A (en) * 1972-10-02 1974-02-05 M Braun Cooling means for electrodes
DE3004706B1 (de) * 1980-02-08 1981-06-11 Siemens AG, 1000 Berlin und 8000 München Drehanoden-Roentgenroehre
EP0184623A2 (en) * 1984-09-24 1986-06-18 The B.F. GOODRICH Company Heat dissipation means for X-ray generating tubes
JPS61250947A (ja) * 1985-04-27 1986-11-08 Shimadzu Corp 強制冷却型回転陽極ｘ線管
DE8802804U1 (de) * 1988-03-02 1988-04-21 Siemens AG, 1000 Berlin und 8000 München Röntgenröhre mit Drehanode

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3790836A (en) * 1972-10-02 1974-02-05 M Braun Cooling means for electrodes
DE3004706B1 (de) * 1980-02-08 1981-06-11 Siemens AG, 1000 Berlin und 8000 München Drehanoden-Roentgenroehre
EP0184623A2 (en) * 1984-09-24 1986-06-18 The B.F. GOODRICH Company Heat dissipation means for X-ray generating tubes
JPS61250947A (ja) * 1985-04-27 1986-11-08 Shimadzu Corp 強制冷却型回転陽極ｘ線管
DE8802804U1 (de) * 1988-03-02 1988-04-21 Siemens AG, 1000 Berlin und 8000 München Röntgenröhre mit Drehanode

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Band 11, Nr. 99 (E-493)[2546], 27. März 1987, Seite 94 E 493; & JP-A-61 250 947 (SHIMADZU CORP.) 08-11-1986 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2675627A1 (fr) * 1991-04-17 1992-10-23 Gen Electric Cgr Ensemble anodique a grille pour tube a rayons x et tube ainsi obtenu.
DE102012208513A1 (de) 2012-05-22 2013-11-28 Siemens Aktiengesellschaft Röntgenröhre

Also Published As

Publication number Publication date
DE8802804U1 (de) 1988-04-21
JPH0231054U (zh) 1990-02-27

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