EP0144014B1 - Tube à rayons X - Google Patents

Tube à rayons X Download PDF

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Publication number
EP0144014B1
EP0144014B1 EP84113641A EP84113641A EP0144014B1 EP 0144014 B1 EP0144014 B1 EP 0144014B1 EP 84113641 A EP84113641 A EP 84113641A EP 84113641 A EP84113641 A EP 84113641A EP 0144014 B1 EP0144014 B1 EP 0144014B1
Authority
EP
European Patent Office
Prior art keywords
cathode
ray tube
cathode head
stainless steel
head
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
EP84113641A
Other languages
German (de)
English (en)
Other versions
EP0144014A1 (fr
Inventor
Klaus Dr. Haberrecker
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 EP0144014A1 publication Critical patent/EP0144014A1/fr
Application granted granted Critical
Publication of EP0144014B1 publication Critical patent/EP0144014B1/fr
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
    • H01J35/14—Arrangements for concentrating, focusing, or directing the cathode ray
    • H01J35/147—Spot size control
    • 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
    • H01J35/06—Cathodes
    • H01J35/066—Details of electron optical components, e.g. cathode cups

Definitions

  • the invention relates to an x-ray tube according to the preamble of claim 1.
  • x-ray tubes are known, for example, from US Pat. No. 3,433,955.
  • the cathode opposite the anode in X-ray tubes contains an electron source, which usually consists of a hot cathode (filament).
  • the electron beam emanating from this source is directed onto the focal spot of the anode by means of a focusing device (Wehnelt cylinder).
  • the hot cathode usually consists of a wire that is wound in the manner of a coil spring and is referred to as a coil.
  • the hot cathode is usually located in a recess (cathode die) of a metal part (cathode head) which has the same potential as it itself.
  • the electron beam is held together and shaped in the desired manner.
  • an elongated focal spot which originates from an incandescent filament which is arranged in a groove-like depression in the cathode head.
  • the cathode head should consist of nickel or a similar material.
  • the cathode head can consist of steel, nickel, molybdenum or other heat-resistant materials such as ceramics or aluminum
  • the object of the invention is to improve the focusing, in particular in the case of small focal spots, in an X-ray tube according to the preamble of claim 1 and to increase the focus stability. According to the invention, this object is achieved by the measures specified in the characterizing part of claim 1.
  • ferromagnetic material the Curie point of which is above 700 ° C.
  • stainless steel can be used as the material of the aforementioned type, it is then better possible to connect the parts of the cathode by welding or soldering. As a result, the heat-conducting contact of the parts of the cathode with one another is significantly improved, so that the heat is better distributed compared to known cathodes and no overheating occurs.
  • Remanit 4006 has proven to be favorable.
  • the former is specified in DIN 17 440, edition 12.72 as material no. 1.4006 or short name X 10 Cr 13, which is a steel that contains 0.08 to 0.12% carbon and 12 to 14% chromium.
  • Remanit 4016 is described in the aforementioned DIN edition under the number 1.4016 and under the short name X 8 Cr 17 as steel, which has a content of more than 0.1% carbon and 15.5 to 17.5% chromium.
  • the use of the aforementioned materials is also particularly suitable because a favorable transition to the Vacon 10, a so-called melting alloy, which is often used for melting with glass and ceramics, the main components of which, in addition to iron, are 28% nickel and 18% cobalt.
  • the thermal expansion behavior of the steels mentioned fits better to that of the alloy than is the case with nickel.
  • the X-ray tube denoted by 1 in FIG. 1 contains the cathode 3 and the anode 4 at the two opposite ends of its bulb 2.
  • the cathode 3 is fastened via an attachment 5.
  • the cathode head 6 is attached to the extension 5 via an intermediate member 7.
  • the heating coil 8 (FIG. 2) is located in a recess in the cathode head 6.
  • An electron beam 9 emanates from it and strikes the focal spot 10 of the anode plate 11 and triggers X-rays 12 there.
  • the anode 11 is set in rotation about the axis 13 by means of a rotor 12 during operation in a known manner by means of a stator (not shown in the figure).
  • the operating voltage of the X-ray tube is between the nozzle 15 and one of the lines 16 and 17 created.
  • the heating voltage of the hot cathode 8 is applied between the lines 16 and 17.
  • the connection 18 at part 7 also gives the cathode head 6 cathode voltage, so that the electrons of the beam 9 emanating from the hot cathode 8 are focused on the anode 11 in the desired manner.
  • the cathode head 6 is welded to the intermediate member 7 at its points of use 6.1 and this is soldered to the shoulder 5 at its points of contact 7.1. These heat-conducting connections significantly reduce the temperature of the focusing head, so that the operating temperature is significantly below the Curie temperature.

Landscapes

  • X-Ray Techniques (AREA)
  • Radiation-Therapy Devices (AREA)

Claims (6)

1. Tube à rayons X comportant une tête de cathode qui contient une source d'électrons, est réalisée en un matériau ferromagnétique et est montée en vis-à-vis de l'anode au moyen d'un support sur l'ampoule du tube, caractérisé par le fait que le point de Curie du matériau ferromagnétique est supérieur à 700 °C et que la tête de cathode est reliée à son support au moyen d'une liaison métallique thermoconductrice directe.
2. Tube à rayon X suivant la revendication 1, caractérisé par le fait que la liaison métallique thermoconductrice directe est une soudure ou une brasure.
3. Tube à rayons X suivant la revendication 1, caractérisé par le fait que le matériau de la tête de cathode est un acier allié ferromagnétique.
4. Tube à rayons X suivant la revendication 3, caractérisé par le fait que le matériau de la tête de cathode est un acier allié portant la désignation «Remanit 4006» ou «4016», dont les constituants principaux sont, en dehors du fer, 0,08 à 0,12% de carbone et 12 à 17,5% de chrome.
5. Tube à rayons X suivant la revendication 3, caractérisé par le fait que parmi les autres parties métalliques de la cathode, au moins l'embout portant la tête de cathode est également réalisé en un acier allié ferromagnétique.
6. Tube à rayons X suivant la revendication 4, caractérisé par le fait que toutes les parties métalliques de la cathode sont constituées par du Remanit 4006 ou 4016.
EP84113641A 1983-11-25 1984-11-12 Tube à rayons X Expired EP0144014B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19833342688 DE3342688A1 (de) 1983-11-25 1983-11-25 Roentgenroehre
DE3342688 1983-11-25

Publications (2)

Publication Number Publication Date
EP0144014A1 EP0144014A1 (fr) 1985-06-12
EP0144014B1 true EP0144014B1 (fr) 1988-06-01

Family

ID=6215273

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84113641A Expired EP0144014B1 (fr) 1983-11-25 1984-11-12 Tube à rayons X

Country Status (4)

Country Link
US (1) US4631744A (fr)
EP (1) EP0144014B1 (fr)
JP (1) JPS60107566U (fr)
DE (2) DE3342688A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3542127A1 (de) * 1985-11-28 1987-06-04 Siemens Ag Roentgenstrahler
BE1007372A3 (nl) * 1993-07-28 1995-05-30 Philips Electronics Nv Rontgenbuis met verbeterde warmteoverdracht.
GB9716657D0 (en) 1997-08-07 1997-10-15 Zeneca Ltd Chemical compounds
US6215852B1 (en) * 1998-12-10 2001-04-10 General Electric Company Thermal energy storage and transfer assembly
US7257194B2 (en) * 2004-02-09 2007-08-14 Varian Medical Systems Technologies, Inc. Cathode head with focal spot control
US7661445B2 (en) * 2005-12-19 2010-02-16 Varian Medical Systems, Inc. Shielded cathode assembly
US9524845B2 (en) 2012-01-18 2016-12-20 Varian Medical Systems, Inc. X-ray tube cathode with magnetic electron beam steering

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2686884A (en) * 1950-05-01 1954-08-17 Dunlec Corp Space charge controlled X-ray tube
US2839698A (en) * 1955-07-01 1958-06-17 Gen Electric Electron shielding in X-ray tubes
US3433955A (en) * 1966-09-26 1969-03-18 Picker Corp X-ray generator with emission control arrangement within the focusing cup
US3875028A (en) * 1972-08-30 1975-04-01 Picker Corp Method of manufacture of x-ray tube having focusing cup with non emitting coating
US3962583A (en) * 1974-12-30 1976-06-08 The Machlett Laboratories, Incorporated X-ray tube focusing means
US4184097A (en) * 1977-02-25 1980-01-15 Magnaflux Corporation Internally shielded X-ray tube
DE2717054A1 (de) * 1977-04-18 1978-10-26 Philips Patentverwaltung Fernfokus-roentgenroehre

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
Brockhaus Enzyklopädie, 17. Aufl. (1950), Bd. 11, S. 802 "Magnetwerkstoffe" *
Römpps Chemie-Lexikon, 7. Auflage (1972), S. 278-279 u. S. 1096 *

Also Published As

Publication number Publication date
DE3471816D1 (en) 1988-07-07
JPS60107566U (ja) 1985-07-22
EP0144014A1 (fr) 1985-06-12
DE3342688A1 (de) 1985-06-05
US4631744A (en) 1986-12-23

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