EP0032385B1 - Dispositif cathodique pour tube à rayons X - Google Patents

Dispositif cathodique pour tube à rayons X Download PDF

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Publication number
EP0032385B1
EP0032385B1 EP81100096A EP81100096A EP0032385B1 EP 0032385 B1 EP0032385 B1 EP 0032385B1 EP 81100096 A EP81100096 A EP 81100096A EP 81100096 A EP81100096 A EP 81100096A EP 0032385 B1 EP0032385 B1 EP 0032385B1
Authority
EP
European Patent Office
Prior art keywords
cathode
ray tube
arrangement
heating coil
longitudinal direction
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
EP81100096A
Other languages
German (de)
English (en)
Other versions
EP0032385A1 (fr
Inventor
Kurt Dr.-Ing. Franke
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
Priority to AT81100096T priority Critical patent/ATE3797T1/de
Publication of EP0032385A1 publication Critical patent/EP0032385A1/fr
Application granted granted Critical
Publication of EP0032385B1 publication Critical patent/EP0032385B1/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
    • H01J35/04—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 a cathode arrangement for an X-ray tube with a cathode pot for electron focusing, which has a groove-like depression for the heating coil.
  • a cathode arrangement of this type is known in which two heating coils located in the groove-like recess of the cathode pot are surrounded by metallic screens.
  • the diaphragm sides can be applied separately to independently adjustable voltages. These voltages set the size of the focal spot on the anode of the X-ray tube. The potential at the diaphragms determines this size.
  • the influence on the expansion of the focal spot via the potentials on the diaphragms is, however, limited. In practice, it is only possible to determine the sharpness of the focal spot in this way.
  • the invention has for its object to provide a cathode arrangement of the type mentioned, which makes it possible to influence the extent of the focal spot.
  • the cathode pot is divided approximately perpendicular to the longitudinal direction of the heating coil into several, mutually insulated parts to which separate control potentials can be supplied.
  • a different grid potential can be fed to several parts of the cathode pot.
  • the extent of the rectangular focal spot can be influenced both in length and in width by means of these grid potentials.
  • Fig. 1 denotes the glass bulb of an X-ray tube 2.
  • a cathode arrangement 3 is provided at one end and an anode arrangement 4 at the opposite end.
  • the cathode arrangement 3 has a cathode pot 6 on its housing 5.
  • the heating coil 7 is located in a groove-like recess 8 of the cathode pot 6, which is used for focusing.
  • the heating coil 7 is opposite the anode 9, which is designed as a rotating anode.
  • To operate the heating coil 7, a heating voltage is applied to the heating coil 7 via lines 10 and 11.
  • the high voltage is fed to the X-ray tube via a line 12 and a connecting piece 13 located at the anode-side end of the X-ray tube 2, which accelerates the electrons emerging from the heating coil 7 in accordance with line 17.
  • the cathode pot 6 is divided perpendicularly to the longitudinal direction of the heating coil 7 into several, namely into three parts 14, 15, 16 which are insulated from one another.
  • the parts 14, 15, 16 of the cathode pot 6 can be supplied with separate control potentials. This makes it possible to influence the dimensions of the focus both in the longitudinal and in the transverse direction via these control potentials.
  • the part 15 is supplied with the control potential Ug1.
  • the tax potential Ug2 lies on parts 14 and 16.
  • the cathode pot 6 is divided perpendicularly to the longitudinal direction of the heating coil 7 into three parts 14, 15, 16, the thickness of which is approximately the same in this longitudinal direction.

Landscapes

  • X-Ray Techniques (AREA)
  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)

Claims (2)

1. Dispositif cathodique pour un tube à rayons X, comportant un pot cathodique pour la focalisation des électrons, présentant une dépression en forme de gorge pour le filament de chauffage, caractérisé par le fait que le pot cathodique (6) est subdivisé, à peu près perpendiculairement à la direction longitudinale du filament de chauffage (7) en plusieurs parties (14, 15, 16) isolées entre elles et auxquelles sont susceptibles d'être appliquées des tensions de commande séparées (Ugl, Ug2).
2. Dispositif cathodique selon la revendication 1, caractérisé, par le fait que le pot cathodique (6) est constitué par trois parties (14, 15, 16) dont les épaisseurs sont sensiblement identiques dans la direction longitudinale du filament de chauffage (7).
EP81100096A 1980-01-14 1981-01-08 Dispositif cathodique pour tube à rayons X Expired EP0032385B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81100096T ATE3797T1 (de) 1980-01-14 1981-01-08 Kathodenanordnung fuer eine roentgenroehre.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19803001141 DE3001141A1 (de) 1980-01-14 1980-01-14 Kathodenanordnung fuer eine roentgenroehre
DE3001141 1980-01-14

Publications (2)

Publication Number Publication Date
EP0032385A1 EP0032385A1 (fr) 1981-07-22
EP0032385B1 true EP0032385B1 (fr) 1983-06-15

Family

ID=6092021

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81100096A Expired EP0032385B1 (fr) 1980-01-14 1981-01-08 Dispositif cathodique pour tube à rayons X

Country Status (4)

Country Link
US (1) US4373144A (fr)
EP (1) EP0032385B1 (fr)
AT (1) ATE3797T1 (fr)
DE (2) DE3001141A1 (fr)

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IL70210A (en) * 1982-11-23 1987-10-20 Elscint Ltd X-ray tube with adjustable focal spot
US4689809A (en) * 1982-11-23 1987-08-25 Elscint, Inc. X-ray tube having an adjustable focal spot
FR2538948B3 (fr) * 1982-12-30 1985-10-18 Thomson Csf Tube a rayons x a balayage
US4685118A (en) * 1983-11-10 1987-08-04 Picker International, Inc. X-ray tube electron beam switching and biasing method and apparatus
FR2572215A1 (fr) * 1984-10-19 1986-04-25 Thomson Cgr Dispositif radiologique a asservissement de position de foyer suivant un axe d'asservissement donne
US4764947A (en) * 1985-12-04 1988-08-16 The Machlett Laboratories, Incorporated Cathode focusing arrangement
NL8603264A (nl) * 1986-12-23 1988-07-18 Philips Nv Roentgenbuis met een ringvormig focus.
US5007074A (en) * 1989-07-25 1991-04-09 Picker International, Inc. X-ray tube anode focusing by low voltage bias
IL91119A0 (en) * 1989-07-26 1990-03-19 Elscint Ltd Arrangement for controlling focal spot position in x-ray tubes
FR2650703B1 (fr) * 1989-08-07 1991-10-11 Gen Electric Cgr Cathode de tube a rayons x et tube ainsi obtenu
DE4100297A1 (de) * 1991-01-08 1992-07-09 Philips Patentverwaltung Roentgenroehre
FR2675629B1 (fr) * 1991-04-17 1997-05-16 Gen Electric Cgr Cathode pour tube a rayons x et tube ainsi obtenu.
FR2687504B1 (fr) * 1992-02-13 1994-04-08 General Electric Cgr Perfectionnements aux tubes a rayons x.
DE19510048C2 (de) * 1995-03-20 1998-05-14 Siemens Ag Röntgenröhre
DE19914739C1 (de) * 1999-03-31 2000-08-03 Siemens Ag Kathode mit direkt geheitzem Flächenemitter
US6438207B1 (en) 1999-09-14 2002-08-20 Varian Medical Systems, Inc. X-ray tube having improved focal spot control
US7257194B2 (en) * 2004-02-09 2007-08-14 Varian Medical Systems Technologies, Inc. Cathode head with focal spot control
DE102009009159A1 (de) * 2009-02-16 2010-10-14 Siemens Aktiengesellschaft Fokuskopf einer Röntgenröhre und zugehöriges Betriebsverfahren
US9524845B2 (en) 2012-01-18 2016-12-20 Varian Medical Systems, Inc. X-ray tube cathode with magnetic electron beam steering
US8831178B2 (en) 2012-07-03 2014-09-09 General Electric Company Apparatus and method of manufacturing a thermally stable cathode in an X-ray tube

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2249365A1 (de) * 1972-10-09 1974-04-25 Siemens Ag Roentgenroehre

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2068287A (en) * 1933-10-14 1937-01-19 Gabor Denes Electric lamp
US2110604A (en) * 1935-08-24 1938-03-08 Westinghouse Electric & Mfg Co Double focus X-ray tube
US2215426A (en) * 1939-04-07 1940-09-17 Machlett Lab Inc X-ray tube
US3646379A (en) * 1970-05-18 1972-02-29 Machlett Lab Inc X-ray tube having controllable focal spot size
US3649861A (en) * 1970-09-09 1972-03-14 Picker Corp Double focus x-ray tube
US4266133A (en) * 1979-11-08 1981-05-05 Siemens Corporation Multiple focus X-ray generator

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2249365A1 (de) * 1972-10-09 1974-04-25 Siemens Ag Roentgenroehre

Also Published As

Publication number Publication date
ATE3797T1 (de) 1983-06-15
DE3160422D1 (en) 1983-07-21
EP0032385A1 (fr) 1981-07-22
US4373144A (en) 1983-02-08
DE3001141A1 (de) 1981-07-16

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