EP0016485B1 - Anodenscheibe für eine Drehanoden-Röntgenröhre - Google Patents

Anodenscheibe für eine Drehanoden-Röntgenröhre Download PDF

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Publication number
EP0016485B1
EP0016485B1 EP80200166A EP80200166A EP0016485B1 EP 0016485 B1 EP0016485 B1 EP 0016485B1 EP 80200166 A EP80200166 A EP 80200166A EP 80200166 A EP80200166 A EP 80200166A EP 0016485 B1 EP0016485 B1 EP 0016485B1
Authority
EP
European Patent Office
Prior art keywords
ring
pyrographite
axis
anode
anode disc
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
Application number
EP80200166A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0016485A1 (de
Inventor
Horst Dr. Hübner
Bernhard Dr.-Ing. Lersmacher
Hans Dr. Lydtin
Rof Wilden
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.)
Philips Intellectual Property and Standards GmbH
Koninklijke Philips NV
Original Assignee
Philips Patentverwaltung GmbH
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics NV
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 Philips Patentverwaltung GmbH, Philips Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Philips Patentverwaltung GmbH
Publication of EP0016485A1 publication Critical patent/EP0016485A1/de
Application granted granted Critical
Publication of EP0016485B1 publication Critical patent/EP0016485B1/de
Expired 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
    • H01J35/108—Substrates for and bonding of emissive target, e.g. composite structures

Definitions

  • the invention relates to an anode disk for a rotating anode X-ray tube with a support body which can be connected to a shaft and is connected to a ring made of pyrographite which is arranged concentrically to its axis of rotation and whose surfaces of greater thermal conductivity run at least approximately perpendicular to the focal spot path connected to it.
  • Such an anode disk is known from DE-OS 2440988.
  • the graphite carrier body of the anode disk is provided with a groove into which the pyrographite ring is inserted.
  • This pyrographite ring dissipates the heat generated in the focal spot on the outer edge of the pyrographite ring better than would be the case if the anode body consisted exclusively of (electro) graphite.
  • the heat generated in the focal spot path is dissipated inwards towards the axis of the carrier body, because the planes of greater thermal and electrical conductivity perpendicular to the growth direction of the pyrographite are perpendicular to the axis of the graphite body of the rotating anode.
  • the bearings of the shaft to which the anode disk is connected inside an X-ray tube can be thermally overloaded.
  • the object of the present invention is to design an X-ray tube of the type mentioned at the outset such that, on the one hand, the heat generated in the focal spot can be dissipated well, and on the other hand, in the operating state of an X-ray tube containing the anode disk mounted on a shaft, the bearings of the shaft are not thermally overloaded.
  • this object is achieved in that the areas of greater thermal and electrical conductivity run parallel to the axis of rotation of the carrier body.
  • rapid removal of the heat from the focal spot path is always ensured, the heat flow in the direction of at least one of the outer surfaces of the anode disk - and not only towards the axis of rotation as in DE-OS 24 40 988 - so that the heat is good on the one hand is dissipated and on the other hand the bearings are not thermally overloaded.
  • Such a pyrographite is used with particular advantage, which is obtained by deposition from the gas phase at low pyrolysis gas pressures (p - 1.33 to 13.3 mbar) and high deposition temperatures (-2000 ° C.) - cf. e.g. B. «Philips Technical Review 1977/78. No. 8, page 205 ff or “Chemie-Ingenieur-Technik”, Volume 39, H 14 (1967), pages 833-842.
  • the graphite described in DE-OS 24 40 988 is a recrystallized - i.e. thermally aftertreated - form.
  • the areas of greater thermal conductivity thus run parallel to the axis of rotation, i. H. they either enclose the axis of rotation concentrically or they lie in planes that run at least approximately radially. If the pyrographite ring is placed in a groove in the latter case, the heat generated in the focal spot path flows through three sides of the ring into the carrier body, and the bearings are protected because this heat can then be optimally stored and radiated in the carrier body. If instead the pyrographite ring is only attached to the carrier body with its inner edge, then two sides of the ring are free to radiate heat generated in the focal track.
  • the focal spot path can also be arranged on the outer circumferential surface of the pyrographite ring if the areas of greater thermal conductivity run radially. However, this presupposes that the metal of the focal spot track holds the pyrographite ring - which in this case must consist of sector-like sections - which can cause difficulties.
  • the heat is dissipated from the focal spot on the one hand to the side of the anode disk facing away from the focal spot path, and on the other hand in the direction of the axis of rotation of the anode disk.
  • the heat transport in the direction of the axis of rotation of the anode plate which could possibly lead to thermal overloading of the bearings, can be reduced according to a development of the invention in that the levels of greater thermal conductivity of the sector-like sections run at least approximately to the axis of rotation and that between the inner edge of the ring and the carrier body, a further ring is provided, the thermal conductivity of which is substantially smaller in the radial direction than that of the ring.
  • the ring made of pyrographite is designated by 1.
  • the pyrographite ring has its best thermal conductivity in the radial direction and in the axial direction.
  • Such a ring can practically not be produced in one piece. Therefore, as indicated by dashed lines, it consists of a large number of segments 10, the adjoining side surfaces of which run approximately radially and whose inner and outer surfaces have a curvature concentric to the axis 3 of the anode disk.
  • These segments can be produced by sawing and / or grinding from pyrographite bodies, the growth direction of which runs perpendicular to the side surfaces of the segments 10 indicated by dashed lines.
  • the upper end face of the ring 1 made of pyrographite, which faces the cathode when the anode disk is installed in an X-ray tube, is provided with a layer 4 made of a material which has a high atomic number and a high temperature resistance, preferably with a layer made of tungsten or Tungsten alloy.
  • This layer can either be applied by deposition from the gas phase onto the beveled end face of the pyrographite ring - it is then relatively thin - or by soldering on a thicker layer with the aid of zirconium such as z. B. described in DE-PS 21 15 896.
  • a further ring 5 is provided in the interior of the ring 1, which serves as a heat barrier and has a significantly lower thermal conductivity - at least in the direction of the axis 3.
  • the ring 5 can also be made of pyrographite for this purpose, but then the surface must be its greater conductivity run concentrically to axis 3.
  • Such a ring can be obtained by depositing a carbon-containing gas on a suitably shaped mandrel, with a direction of growth parallel to the diameter of the ring 5.
  • the pyrographite ring 1 is enclosed on its outer edge by a further one or more millimeter thick pyrographite ring 6, the surface of which has greater thermal conductivity also runs concentrically to the axis 3 of the anode disk.
  • the rings 5 and 6 can be carried out simultaneously and directly by depositing a carbon-containing gas on the pyrographite ring 1.
  • the end faces of the ring 1 are also covered with a layer of pyrographite. These layers on the end faces of the ring hinder heat dissipation and must therefore be ground down.
  • the outer ring 6 is provided with bores 7 which are uniformly distributed on its circumference and through which holes the outer surface of the pyrographite ring 1 can radiate heat.
  • the outer diameter of the pyrographite ring 4 can be 80 to 300 mm, preferably 120 mm, its thickness 10 to 40 mm, preferably 20 mm, and its height 10 to 40 mm, preferably 20 mm.
  • the heat generated in the focal spot track 4 is transported through the pyrographite ring to its lower end face, where it can be radiated, and to its outer surface, where it is also radiated.
  • the thermal conductivity and the thermal capacity of the carrier body 8, which connects the ring 1 to a shaft (not shown in FIG. 1) through the bore 9 in the carrier body only have to meet low requirements if its electrical conductivity is sufficient .
  • the carrier body can therefore consist of normal, porous or microporous glass-like carbons, foam-like carbons, with carbide-forming and non-carbide-forming metals, impregnated foam carbons, fiber-reinforced boron nitride or also from a light metal such as titanium.
  • the carrier body 8 is connected to the inner surface of the inner ring 5 by suitable measures, such as clamping, screwing, soldering or welding.
  • suitable measures such as clamping, screwing, soldering or welding.
  • the soldering can be done in a known manner by using e.g. B. a zircon solder.
  • suitable measures such as. B. the use of a carrier body in the form of a spoke wheel or two carrier bodies of equal size offset in the axial direction, it is possible to keep the anode disk stable even with large disk diameters.
  • a pyrographite ring can also be used, which is formed in one piece and whose surfaces of better thermal conductivity surround the axis 3 concentrically.
  • the outer rings 5 and 6 can be omitted.
  • Such a ring could be made by depositing a carbon-containing gas on a cylindrical mandrel. However, the heat from the focal spot path would only be transported downwards, but not to the outside.
  • the carrier body 8 is provided with a groove 11 which is approximately rectangular in cross section and in which a pyrographite ring 1 is arranged. As indicated by the arrows 2, the surfaces of the better conductivity run in the direction of the ring and in the axial direction.
  • the pyrographite layers thus form 3 hollow cylindrical surfaces concentric to the disc axis.
  • the focal spot web 4 can be applied to the beveled end face of the pyrographite ring in the manner described in connection with FIG. 1.
  • the connection between the pyrographite ring 1 and the carrier body 8 can be done by the techniques described above.
  • a ring consisting of many segments can be used and these segments can either be arranged in such a way that their levels of greater conductivity run in the radial direction or in turn enclose the axis 3 concentrically.
  • a heat barrier is required between the carrier body and the inner edge of the pyrographite ring 1 in order to prevent the heat from flowing out inwardly from the pyrographite body.

Landscapes

  • X-Ray Techniques (AREA)
EP80200166A 1979-03-15 1980-02-27 Anodenscheibe für eine Drehanoden-Röntgenröhre Expired EP0016485B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2910138 1979-03-15
DE19792910138 DE2910138A1 (de) 1979-03-15 1979-03-15 Anodenscheibe fuer eine drehanoden- roentgenroehre

Publications (2)

Publication Number Publication Date
EP0016485A1 EP0016485A1 (de) 1980-10-01
EP0016485B1 true EP0016485B1 (de) 1983-02-16

Family

ID=6065437

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80200166A Expired EP0016485B1 (de) 1979-03-15 1980-02-27 Anodenscheibe für eine Drehanoden-Röntgenröhre

Country Status (5)

Country Link
US (1) US4344012A (ja)
EP (1) EP0016485B1 (ja)
JP (2) JPS55124935A (ja)
DE (2) DE2910138A1 (ja)
ES (1) ES489488A1 (ja)

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2928993C2 (de) * 1979-07-18 1982-12-09 Philips Patentverwaltung Gmbh, 2000 Hamburg Verfahren zur Herstellung einer Röntgenröhren-Drehanode
DE3040719A1 (de) * 1980-10-29 1982-05-19 Philips Patentverwaltung Gmbh, 2000 Hamburg Roentgenroehren-drehanode
DE3041249A1 (de) * 1980-11-03 1982-06-09 Philips Patentverwaltung Gmbh, 2000 Hamburg Koerper, der wenigstens teilweise aus pyrolytischem graphit besteht, insbesondere anodenscheibe fuer eine drehanoden-roentgenroehre und verfahren zu seiner herstellung
US4417175A (en) * 1981-05-15 1983-11-22 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Ion sputter textured graphite electrode plates
FR2593638B1 (fr) * 1986-01-30 1988-03-18 Lorraine Carbone Support pour anticathode tournante de tubes a rayons x
FR2625035B1 (fr) * 1987-12-22 1993-02-12 Thomson Cgr Anode tournante en materiau composite pour tube a rayons x
FR2644289B1 (fr) * 1989-03-07 1991-06-21 Mecanique Magnetique Sa Tube a rayons x a anode tournante suspendue par paliers magnetiques actifs et refroidie par circulation de fluide
US5444327A (en) * 1993-06-30 1995-08-22 Varian Associates, Inc. Anisotropic pyrolytic graphite heater
US7561669B2 (en) * 2004-06-03 2009-07-14 General Electric Company Method and system for thermal control in X-ray imaging tubes
DE102005062074A1 (de) * 2005-07-25 2007-02-01 Schunk Kohlenstofftechnik Gmbh Kühlkörper sowie Verfahren zur Herstellung eines Kühlkörpers
DE102006010232A1 (de) * 2006-03-02 2007-09-06 Schunk Kohlenstofftechnik Gmbh Verfahren zur Herstellung eines Kühlkörpers sowie Kühlkörper
US8553844B2 (en) * 2007-08-16 2013-10-08 Koninklijke Philips N.V. Hybrid design of an anode disk structure for high prower X-ray tube configurations of the rotary-anode type
DE102009007871B4 (de) * 2009-02-06 2012-04-26 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Röntgentarget, Röntgenröhre und Verfahren zur Erzeugung von Röntgenstrahlung
US9449782B2 (en) * 2012-08-22 2016-09-20 General Electric Company X-ray tube target having enhanced thermal performance and method of making same
US9504438B2 (en) * 2012-10-12 2016-11-29 Koninklijke Philips N.V. Radiographic imaging apparatus and method
CN106575592B (zh) * 2014-08-12 2020-10-16 皇家飞利浦有限公司 旋转阳极以及用于生产旋转阳极的方法
AT17122U1 (de) * 2020-02-10 2021-06-15 Plansee Se Röntgendrehanode
US11633168B2 (en) * 2021-04-02 2023-04-25 AIX Scan, Inc. Fast 3D radiography with multiple pulsed X-ray sources by deflecting tube electron beam using electro-magnetic field

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1764042B1 (de) * 1968-03-26 1971-05-27 Koch & Sterzel Kg Roentgenroehren drehanode mit anodenkoerper aus graphit
AT315305B (de) * 1971-03-16 1974-05-27 Siemens Ag Drehanode für Röntgenröhren
DE2152049A1 (de) * 1971-10-19 1973-04-26 Siemens Ag Drehanoden-roentgenroehre
FR2235478B1 (ja) * 1973-06-29 1977-02-18 Radiologie Cie Gle
FR2242775A1 (en) * 1973-08-31 1975-03-28 Radiologie Cie Gle Rotary anode for X-ray tubes - using pseudo-monocrystalline graphite for better heat conduction
JPS511737U (ja) * 1974-06-19 1976-01-08
US4037127A (en) * 1975-12-05 1977-07-19 Tokyo Shibaura Electric Co., Ltd. X-ray tube
DE2618235C3 (de) * 1976-04-26 1983-01-13 Siemens AG, 1000 Berlin und 8000 München Röntgenröhren-Drehanode
US4227112A (en) * 1978-11-20 1980-10-07 The Machlett Laboratories, Inc. Gradated target for X-ray tubes

Also Published As

Publication number Publication date
DE3061956D1 (en) 1983-03-24
JPS55124935A (en) 1980-09-26
ES489488A1 (es) 1980-09-16
DE2910138A1 (de) 1980-09-25
JPS6162347U (ja) 1986-04-26
EP0016485A1 (de) 1980-10-01
US4344012A (en) 1982-08-10

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