EP0301301A1 - Tube à rayons X à anode tournante - Google Patents

Tube à rayons X à anode tournante Download PDF

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Publication number
EP0301301A1
EP0301301A1 EP88111062A EP88111062A EP0301301A1 EP 0301301 A1 EP0301301 A1 EP 0301301A1 EP 88111062 A EP88111062 A EP 88111062A EP 88111062 A EP88111062 A EP 88111062A EP 0301301 A1 EP0301301 A1 EP 0301301A1
Authority
EP
European Patent Office
Prior art keywords
anode
contact piece
ray tube
vacuum housing
drive shaft
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.)
Ceased
Application number
EP88111062A
Other languages
German (de)
English (en)
Inventor
Hans Ebersberger
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 EP0301301A1 publication Critical patent/EP0301301A1/fr
Ceased 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
    • H01J35/103—Magnetic 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
    • H01J35/101—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
    • H01J2235/00—X-ray tubes
    • H01J2235/10—Drive means for anode (target) substrate
    • H01J2235/1006—Supports or shafts for target or substrate

Definitions

  • the invention relates to a rotating anode X-ray tube with a cathode accommodated in a vacuum housing and rotating anode with a drive shaft which is provided with bearings which are supported on the vacuum housing and with an anode contact which can be actuated by a magnet.
  • Such an X-ray tube with a magnetically mounted anode shaft is known, for example, from US Pat. No. 4,167,671.
  • the shafts of rotating anodes of X-ray tubes generally have mechanical bearings which, for example to compensate for thermal expansion, have a certain amount of play, which have no bearings.
  • the shafts of magnetically mounted rotating anodes are also assigned mechanical bearings. They are dimensioned so that they do not contribute to the bearing of the drive shaft with effective magnetic bearing of the drive shaft and serve to catch the rotating system when the magnetic holder is omitted, ie when the anode "crashes", but that means that when switched off and especially when transporting the rotating anode X-ray tube, the bearings have a sometimes considerable play, so that the rotating anode cannot be locked securely, but rather can swing around within the vacuum housing.
  • European patent application 0 154 699 describes a rotating anode X-ray tube with magnetic bearing, in which the safety bearings are fixedly connected to the housing and rings are arranged on the shaft, which are connected to the bearing race when the rotating anode falls.
  • the mechanical bearing has play, so that the rotating anode can strike when the magnetic bearing is switched off.
  • the invention has for its object to provide a rotating anode X-ray tube of the type mentioned, in which the sliding surface of the anode contact is outside the vacuum and in which the shaft can still be locked for the transport state.
  • the anode contact has a contact piece connected to the armature of the magnet, that the contact piece is tightly connected to the vacuum housing by a bellows, and that the contact piece has a guide outside the vacuum housing.
  • the contact piece is slidably guided outside the vacuum, so that the sliding surface of the contact piece can also be subsequently lubricated.
  • the contact piece can also be driven mechanically from the outside by an electromagnet.
  • the object is further achieved in that a locking device is provided which presses the contact piece firmly against the drive shaft in the transport state. As a result, the shaft is pressed against the bearings by the contact piece, so that the play of the bearings is eliminated.
  • a secure centric locking is achieved when a part of the bearing which abuts the drive shaft and faces the contact piece has an inclined surface which can be brought into engagement with the contact piece connected to the armature of the magnet.
  • the force acting on the contact piece by the air pressure is eliminated if a spring connected to the vacuum housing is supported on the collar.
  • a particularly simple locking device is achieved if it has a screw which acts radially to the drive shaft and is connected to the vacuum housing and which acts on the contact piece. It has proven to be advantageous if an inwardly directed nose, to which the locking device is attached, is attached to the tube attached to the vacuum housing.
  • the contact pressure of the contact switch can be kept low if the drive shaft or the contact piece is provided with a resilient contact pin.
  • FIG. 1 shows a rotating anode X-ray tube 1, the piston of which consists of a metal pot 2, the open side of which is melted in a vacuum-tight manner with a seam 3 on a glass part 4.
  • the metal pot 2 and the glass part 4 form a vacuum housing.
  • a cathode 5 and an anode arrangement 6 in a known manner.
  • This consists of an anode plate 7 with a drive shaft 8, which is mounted in a tubular, in the glass part 4 glazed nozzle 10, which delimits the vacuum housing downwards.
  • a rotor 11 is also attached to the drive shaft 8 and, together with a stator (not shown) attached to the outside of the glass part 4, drives the anode system 6.
  • a magnet arrangement for supporting the anode arrangement 6 is provided for operation, which is known per se and, since it does not belong to the actual X-ray tube 1, has been omitted from the present illustration for the sake of clarity.
  • Additional mechanical bearings, the ball bearings 12 and 13, are attached in the socket 10 as a catch bearing for the magnetically mounted anode arrangement 6.
  • the drive shaft 8 has a ring 14 and 15 on each side of the bearing 12 at the upper end and a ring 16 on the lower bearing 13, each of which has bevels 17 to 19 facing the bearings 12, 13, each having a bevel 20 to 22 the inner races 23 and 24 of the bearings 12 and 13 face each other and have a distance of, for example, 0.25 mm to them in the operating state.
  • the anode arrangement 6 is set in rotation in a manner known per se, between the lines 25 and 26 a heating voltage for the cathode 5 and also between the line 25 and the connecting piece 10 an acceleration voltage is also applied, so that the excitation is then initiated
  • Cathode coil 27 exits an electron beam 28 which strikes the focal spot 29 of the anode plate 7 and generates X-rays there, which exit in a bundle 30 from a window 31 of the X-ray tube 1.
  • FIG. 2 shows an anode contact for the X-ray tube 1 shown in FIG. 1.
  • An, for example, cylindrical contact piece 32 is guided through an opening in the socket 10 of the X-ray tube 1 and has a nose 33 with which the contact piece 32 is connected to the socket 10 by a bellows 34 is hermetically connected.
  • the contact piece 32 is connected to the armature 35 of a magnet 36 outside the vacuum.
  • the contact piece 32 is connected to an angular and cylindrical collar 37, the outer surface of which extends parallel to the outer surface of the contact piece and is slidably mounted within a cylindrical tube 38 with a sliding surface 39.
  • the contact piece is moved so far into the socket 10 that, as can be seen in FIG. 3, it touches a contact pin 42 which is attached centrally to the end of the drive shaft 8 and is preloaded by a spring 41 and thus closes the anode contact, so that the drive shaft 8 is connected to one pole of the high-voltage source, not shown, for operation. If the high voltage is switched off again, the magnet 36 is switched off at the same time, so that the contact piece 32 lifts off the contact pin 42 due to the pressure of the spring 40, so that the voltage supply is interrupted.
  • the guidance of the contact piece 32 can be accomplished easily and safely, since the sliding surface 39 can be lubricated from the outside at all times and contamination of the vacuum is excluded.
  • the end face of the contact piece 32 protruding into the socket 10 of the X-ray tube 1 has bevels 43 which can be brought into engagement with the end faces of the ring 16, which are also conically tapered.
  • the ring 16 projects beyond the end face of the drive shaft 8.
  • the contact piece 32 can be moved in the direction of the drive shaft by means of a screw 45 fastened to an inwardly directed nose 44 which is attached to the tube 38 and which acts on the collar 37 8 adjust against the force of the spring 40.
  • This arrangement of the anode contact ensures that on the one hand the sliding surface 39 of the anode contact is outside the vacuum and can therefore be lubricated. Furthermore, a transport lock for the anode shaft 8 is obtained at the same time, so that damage during transport due to the back and forth beating of the anode arrangement 6 is prevented.

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  • X-Ray Techniques (AREA)
EP88111062A 1987-07-22 1988-07-11 Tube à rayons X à anode tournante Ceased EP0301301A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8710059U 1987-07-22
DE8710059U DE8710059U1 (de) 1987-07-22 1987-07-22 Drehanoden-Röntgenröhre

Publications (1)

Publication Number Publication Date
EP0301301A1 true EP0301301A1 (fr) 1989-02-01

Family

ID=6810335

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88111062A Ceased EP0301301A1 (fr) 1987-07-22 1988-07-11 Tube à rayons X à anode tournante

Country Status (3)

Country Link
US (1) US4891832A (fr)
EP (1) EP0301301A1 (fr)
DE (1) DE8710059U1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4416316C1 (de) * 1994-05-09 1995-06-08 Siemens Ag Röntgenröhre
DE102012208513A1 (de) 2012-05-22 2013-11-28 Siemens Aktiengesellschaft Röntgenröhre

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5216308A (en) * 1989-05-25 1993-06-01 Avcon-Advanced Controls Technology, Inc. Magnetic bearing structure providing radial, axial and moment load bearing support for a rotatable shaft
US5315197A (en) * 1992-04-30 1994-05-24 Avcon - Advance Controls Technology, Inc. Electromagnetic thrust bearing using passive and active magnets, for coupling a rotatable member to a stationary member
US5514924A (en) * 1992-04-30 1996-05-07 AVCON--Advanced Control Technology, Inc. Magnetic bearing providing radial and axial load support for a shaft
US6198803B1 (en) 1999-08-20 2001-03-06 General Electric Company Bearing assembly including rotating element and magnetic bearings
NL1022430C2 (nl) * 2003-01-19 2005-12-14 Edigit B V Het plaatsen, fixeren, bevestigen en vervoeren van een digitale reader van röntgenbeelden ten behoeve van ambulant gebruik.
US8385505B2 (en) * 2009-06-19 2013-02-26 Varian Medical Systems, Inc. X-ray tube bearing assembly

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1094465A (fr) * 1953-11-20 1955-05-20 Acec Joints rotatifs pour des vides poussés
DE2716079B1 (de) * 1977-04-12 1978-08-10 Kernforschungsanlage Juelich Drehanodenroentgenroehre
EP0071456A1 (fr) * 1981-07-30 1983-02-09 Kabushiki Kaisha Toshiba Tube à rayon X avec anode rotative
EP0154699A1 (fr) * 1984-02-28 1985-09-18 Siemens Aktiengesellschaft Tube à rayons X à anode tournante

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60164013A (ja) * 1984-02-03 1985-08-27 Toshiba Corp 磁気軸受

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1094465A (fr) * 1953-11-20 1955-05-20 Acec Joints rotatifs pour des vides poussés
DE2716079B1 (de) * 1977-04-12 1978-08-10 Kernforschungsanlage Juelich Drehanodenroentgenroehre
EP0071456A1 (fr) * 1981-07-30 1983-02-09 Kabushiki Kaisha Toshiba Tube à rayon X avec anode rotative
EP0154699A1 (fr) * 1984-02-28 1985-09-18 Siemens Aktiengesellschaft Tube à rayons X à anode tournante

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4416316C1 (de) * 1994-05-09 1995-06-08 Siemens Ag Röntgenröhre
DE102012208513A1 (de) 2012-05-22 2013-11-28 Siemens Aktiengesellschaft Röntgenröhre

Also Published As

Publication number Publication date
US4891832A (en) 1990-01-02
DE8710059U1 (de) 1988-11-17

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