EP0509901B1 - Dispositif de blindage d'un stator de moteur pour anode tournante de tube à rayons X - Google Patents

Dispositif de blindage d'un stator de moteur pour anode tournante de tube à rayons X Download PDF

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Publication number
EP0509901B1
EP0509901B1 EP92401039A EP92401039A EP0509901B1 EP 0509901 B1 EP0509901 B1 EP 0509901B1 EP 92401039 A EP92401039 A EP 92401039A EP 92401039 A EP92401039 A EP 92401039A EP 0509901 B1 EP0509901 B1 EP 0509901B1
Authority
EP
European Patent Office
Prior art keywords
stator
tube
rotor
ray tube
shaped insulating
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
Application number
EP92401039A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0509901A1 (fr
Inventor
Christine Cabinet Ballot-Schmit Guerin
Jacques Cabinet Ballot-Schmit Le Guen
Bernard Cabinet Ballot-Schmit Pouzergues
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.)
General Electric CGR SA
Original Assignee
General Electric CGR SA
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 General Electric CGR SA filed Critical General Electric CGR SA
Publication of EP0509901A1 publication Critical patent/EP0509901A1/fr
Application granted granted Critical
Publication of EP0509901B1 publication Critical patent/EP0509901B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H01J35/16—Vessels; Containers; Shields associated therewith
    • 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
    • H01J2235/00—X-ray tubes
    • H01J2235/16—Vessels
    • H01J2235/165—Shielding arrangements
    • H01J2235/168—Shielding arrangements against charged particles

Definitions

  • the invention relates to X-ray tubes with a rotating anode and more particularly a device for shielding the stator of the motor for driving the rotating anode.
  • X-ray tubes for medical diagnosis for example, are generally constituted (FIG. 1) like a diode, that is to say with a cathode 11 and an anode 12 or anti-cathode, these two electrodes being enclosed in a envelope 14 vacuum tight and which allows for electrical isolation between these two electrodes.
  • the cathode 11 produces an electron beam 13 and the anode 12 receives these electrons over a small surface which constitutes a focal point from which the X-rays are emitted.
  • a small proportion of the energy expended in producing the electron beam 13 is transformed into X-rays, the rest of this energy being transformed into heat. Also, also taking into account the large instantaneous powers involved, manufacturers have long produced X-ray tubes with a rotating anode where the anode is rotated to distribute the flux. thermal on a crown called focal crown, with a much larger area than the focal point, the interest being all the greater as the speed of rotation is high (generally between 3,000 and 12,000 revolutions per minute).
  • the rotary anode of the conventional type has the general shape of a disc having an axis of symmetry 16 around which it is rotated by means of an electric motor 17; the electric motor has a stator 18 located outside the envelope 14 and a rotor 19 mounted in the envelope 14 of the X-ray tube and arranged along the axis of symmetry 16, the rotor being mechanically secured to the anode 12 via a support shaft 20.
  • the X-ray tube heats up and it is necessary to cool it by placing it in an enclosure, called a sheath, in which circulates a coolant and insulating fluid which can be cooled by an appropriate device .
  • This sheath made of metal internally lined with a layer of lead, also serves to protect the external environment against X-rays emitted by the focal point of the X-ray tube in all directions.
  • the combination of the sheath and the tube then forms what is called an X-ray unit.
  • the X-ray tube unlike so-called passive components such as resistors, coils and capacitors, etc., which behave according to established laws, is a component of the active or reactive type which generates random disturbances against which you have to protect yourself.
  • the x-ray tubes which are used in medical diagnostic radiology are vacuum tubes operating at very high voltages up to 150 kilovolts. These high voltages cause very high electric fields in the vacuum, which are intensified by the presence of impurities or micro-aggregates on the surface of the electrodes which it is difficult to remove during the manufacture of the tube despite all the care taken. surface treatments.
  • This phenomenon occurs occasionally throughout the life of the tube and it is the means by which the X-ray tube is cleaned of impurities which can move randomly during the life of the tube.
  • the only elements which are not protected are the supply conductors of the cathode and the anode as well as those of the stator. It is known to protect the supply conductors of the cathode and the anode by using coaxial cables of a special type which include an external shielding grounded to the metal casing of the sheath.
  • the object of the present invention is therefore to produce shielding screens for the stator which do not have the disadvantages noted above.
  • the invention relates to an X-ray tube with a rotating anode comprising a shielding device for the stator of the tube drive motor, said tube being held in a metal sheath by an insulating support in the form of a cup also serving as a support for the stator.
  • said device consists of a conductive layer deposited on the part insulating the stator from the rotor on its outer wall so as to produce an electrostatic screen between the anode and the stator on the one hand, and between the rotor and the stator on the other part, said conductive layer having a circular discontinuity at mid-height of the stator.
  • the X-ray tube with a rotating anode comprising a shielding device for the stator of the tube drive motor, according to the invention, consists of a layer of insulating material placed on the magnetic circuit, the winding and the power cable, and by a metal film which is disposed on this insulating material grounded and having an electrical discontinuity on the rotor side.
  • An X-ray tube 24 (FIG. 2), of the type described in the preamble in relation to FIG. 1, is disposed in a closed metal enclosure or sheath 21 filled with an insulating and cooling fluid 22.
  • the X-ray tube 24 is held in position in this sheath by an insulating flange 23, integral with the sheath 21, which encloses the envelope 14 of the tube and by an insulating support 25 integral with the sheath 21, on which rests one end 26 of a rotor 27 situated inside the envelope 24.
  • the insulating support 25 in the form of a cup, also serves as a support for a stator 18 placed inside the cup, this stator comprising a magnetic circuit 29 and a coil 30.
  • An insulating part 31 or tulip is interposed between the stator 28 and the rotor 27, outside the casing 14, and is fixed to the insulating support or cut 25.
  • the supply conductors of the various elements of the cathode 11 come from the generator 15 via connections which are plugged into receptacles 32 and 33 passing through the wall of the sheath 21.
  • the supply conductor of the anode comes from said generator 15 via a connector which is plugged into a receptacle 34 passing through the wall of the sheath 21.
  • the sheath 21 is conventionally equipped with a window 35 for the exit of the X-ray beam.
  • the outer wall of the tulip 31 is coated with a conductive layer 36 on an area between the points A and A ', this conductive layer having a circular discontinuity 37 which is carried out at mid-height of the magnetic circuit 29.
  • the purpose of this discontinuity is to prevent currents from being induced in the conductive layer instead of the rotor.
  • the distance AA ' is such that the layer 36 creates an electrostatic screen between the anode and the stator and between the rotor and the stator.
  • the edges of the cup 25 are extended to completely envelop the stator and the internal wall of the cup is coated with a conductive layer 38 over an area between the points B and B 'which surrounds all the stator.
  • these layers are grounded to the sheath 21 by means of low impedance such as by soldering ground conductors to the layers or flexible bronze contacts. beryllium referenced 39, 40, 41 and 42.
  • the winding 30 is supplied by conductors in a cable 43 which passes through the section 25 through a hole 44 and the sheath through a sealed passage 45.
  • section 25 has holes 46 for the circulation of the fluid 22.
  • the electrostatic screen is produced by a metallic film which is applied to the coil 30, the cable 43 as well as to the magnetic circuit 29 and the active wires which it encloses in its grooves.
  • the conductive parts 29, 30 and 43 will be previously isolated by a varnish or an insulating material so as to avoid short circuits between the winding conductors and the sheets of the magnetic circuit.
  • the material of the metallic layer or film can be silver copper, or any other material that is a good electrical conductor and its thickness can be from a few microns to a few tenths of a millimeter.

Landscapes

  • X-Ray Techniques (AREA)
EP92401039A 1991-04-17 1992-04-14 Dispositif de blindage d'un stator de moteur pour anode tournante de tube à rayons X Expired - Lifetime EP0509901B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9104734 1991-04-17
FR9104734A FR2675630B1 (fr) 1991-04-17 1991-04-17 Dispositif de blindage d'un stator de moteur pour anode tournante de tube a rayons x.

Publications (2)

Publication Number Publication Date
EP0509901A1 EP0509901A1 (fr) 1992-10-21
EP0509901B1 true EP0509901B1 (fr) 1997-03-05

Family

ID=9411956

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92401039A Expired - Lifetime EP0509901B1 (fr) 1991-04-17 1992-04-14 Dispositif de blindage d'un stator de moteur pour anode tournante de tube à rayons X

Country Status (5)

Country Link
US (1) US5206892A (ja)
EP (1) EP0509901B1 (ja)
JP (1) JP3266310B2 (ja)
DE (1) DE69217694T2 (ja)
FR (1) FR2675630B1 (ja)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6373921B1 (en) 1999-12-27 2002-04-16 General Electric Company X-ray unit including electromagnetic shield
JP6021338B2 (ja) * 2012-01-17 2016-11-09 キヤノン株式会社 放射線発生装置及びそれを用いた放射線撮影装置
JP7089396B2 (ja) * 2018-04-12 2022-06-22 浜松ホトニクス株式会社 Ｘ線発生装置

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0491519A1 (en) * 1990-12-18 1992-06-24 General Electric Company X-ray tube transient noise suppression system

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2703373A (en) * 1949-06-21 1955-03-01 Gen Electric X-ray tube
US2890358A (en) * 1956-02-01 1959-06-09 Gen Electric X-ray tube
US4225787A (en) * 1977-11-02 1980-09-30 The Machlett Laboratories, Inc. X-ray tube control system
US4161655A (en) * 1977-11-28 1979-07-17 General Electric Company Multi-cell detector using printed circuit board
IT8247873A0 (it) * 1981-03-03 1982-02-26 Machlett Lab Inc Perfezionamento nei tubi generatori di raggi x con schermo statorico
JPS60163355A (ja) * 1984-02-03 1985-08-26 Toshiba Corp Ｘ線管装置
FR2637732B1 (fr) * 1988-10-07 1995-11-17 Gen Electric Cgr Perfectionnements aux dispositifs de refroidissement de tubes a rayons x
FR2646982B1 (fr) * 1989-05-10 1992-02-07 Gen Electric Cgr Dispositif de securite pour ensemble radiogene
JPH02303098A (ja) * 1989-05-17 1990-12-17 Oike Ind Co Ltd 電磁波シールド用フイルム

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0491519A1 (en) * 1990-12-18 1992-06-24 General Electric Company X-ray tube transient noise suppression system

Also Published As

Publication number Publication date
DE69217694T2 (de) 1997-07-03
JP3266310B2 (ja) 2002-03-18
EP0509901A1 (fr) 1992-10-21
US5206892A (en) 1993-04-27
FR2675630A1 (fr) 1992-10-23
JPH05135720A (ja) 1993-06-01
DE69217694D1 (de) 1997-04-10
FR2675630B1 (fr) 1993-07-16

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