EP0369529A1 - Tube à rayons x - Google Patents

Tube à rayons x Download PDF

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Publication number
EP0369529A1
EP0369529A1 EP89202836A EP89202836A EP0369529A1 EP 0369529 A1 EP0369529 A1 EP 0369529A1 EP 89202836 A EP89202836 A EP 89202836A EP 89202836 A EP89202836 A EP 89202836A EP 0369529 A1 EP0369529 A1 EP 0369529A1
Authority
EP
European Patent Office
Prior art keywords
cathode
ray tube
exit window
anode
radiation exit
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.)
Withdrawn
Application number
EP89202836A
Other languages
German (de)
English (en)
Inventor
Rolf Behling
Wolfgang Köster
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 EP0369529A1 publication Critical patent/EP0369529A1/fr
Withdrawn legal-status Critical Current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 an X-ray tube with an anode and a cathode, which are located in an evacuated metal piston provided with a radiation exit window and, in operation, carry positive or negative high voltage with respect to the latter.
  • Such an X-ray tube is known from DE-PS 24 55 974.
  • Fig. 1 shows a rotating anode X-ray tube of this type in a partially broken representation.
  • the X-ray tube comprises an evacuated tube piston 1 made of metal, hereinafter referred to as a metal piston, in which a disk-shaped rotating anode 2 and a cathode 3 are located.
  • the anode 2 and the cathode 3 are mounted in the metal piston in a manner not shown in more detail or fastened thereon. This storage takes place in each case via an insulator, not shown.
  • the anode or cathode has a positive or negative high-voltage potential with respect to the metal piston 1 which is at earth potential.
  • Such radiation exit windows are relatively thin and preferably consist of beryllium, which weakens the X-rays only slightly. This window heats up relatively strongly during operation of the X-ray tube.
  • This object is achieved in that the cathode is provided, at least in its region adjacent to the radiation exit window, with a bead which extends in the axial direction to shield the radiation exit window from the electrons emitted by the cathode.
  • the bead provided according to the invention in the region of the cathode which faces the radiation exit window produces an electrical field distribution in the operating state which influences the paths of the electrons emitted from the cathode in such a way that they can practically no longer reach the radiation exit window.
  • the bead also reduces the proportion of the electrons emitted from the cathode, which hit the tube piston directly - or after one or more reflections, in particular at the anode - so that the current flowing through the tube piston in the operating state is a change with a high internal generator resistance of the cathode voltage is reduced.
  • FIG. 2 shows the cathode of a so-called double focus X-ray tube, ie an X-ray tube which has two heating filaments lying next to one another, the longitudinal direction of which is approximately perpendicular to the radiation exit window 4 runs.
  • the two heating filaments (not shown in more detail) are located in mutually inclined dies (recesses) that are inclined towards one another.
  • the two dies, of which only the rear die 31 is visible in the drawing, are separated from one another by a central web 32 which, in the cross-sectional illustration, also covers the filament located at the lowest part 33 of the die 31.
  • the bead 34 extends in the axial direction and covers an arc of approx. 90 °°, has a thickness of 3 mm and a maximum height of 4 mm (Fig. 2 is not to scale).
  • the filament or the die must be designed in such a way that the electrons hit the intended area of the anode during the predetermined deflection by the bead 34.
  • the bead 34 practically prevents electrons emitted from the cathode from hitting the window directly. Only electrons reflected at the anode 2 still reach the radiation exit window. The reduction in the number (and in part also in the energy) of the electrons hitting the radiation exit window also reduces its heating. In addition, the bead means that fewer electrons can get onto the metal bulb of the X-ray tube. This leads to a reduction in the unwanted current through the metal flask of the x-ray tube.

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  • X-Ray Techniques (AREA)
EP89202836A 1988-11-14 1989-11-08 Tube à rayons x Withdrawn EP0369529A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3838539A DE3838539A1 (de) 1988-11-14 1988-11-14 Roentgenroehre
DE3838539 1988-11-14

Publications (1)

Publication Number Publication Date
EP0369529A1 true EP0369529A1 (fr) 1990-05-23

Family

ID=6367130

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89202836A Withdrawn EP0369529A1 (fr) 1988-11-14 1989-11-08 Tube à rayons x

Country Status (4)

Country Link
US (1) US5008917A (fr)
EP (1) EP0369529A1 (fr)
JP (1) JPH02223143A (fr)
DE (1) DE3838539A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5511104A (en) * 1994-03-11 1996-04-23 Siemens Aktiengesellschaft X-ray tube

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05119625A (ja) * 1991-10-28 1993-05-18 Minolta Camera Co Ltd 磁気ブラシ現像装置
JP4786285B2 (ja) * 2005-10-07 2011-10-05 浜松ホトニクス株式会社 Ｘ線管
DE102011003943A1 (de) * 2011-02-10 2012-08-16 Siemens Aktiengesellschaft Kathode und Röntgenröhre mit einer derartigen Kathode

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2107597A (en) * 1932-06-27 1938-02-08 Philips Nv High voltage discharge tube
US3549931A (en) * 1968-12-04 1970-12-22 Torr Lab Inc X-ray transmissive window assembly
US4309637A (en) * 1979-11-13 1982-01-05 Emi Limited Rotating anode X-ray tube

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2926270A (en) * 1957-12-30 1960-02-23 Gen Electric Rotating anode x-ray tube
US3250916A (en) * 1963-06-14 1966-05-10 Machlett Lab Inc Stereo x-ray device
DE2455974C3 (de) * 1974-11-27 1979-08-09 Philips Patentverwaltung Gmbh, 2000 Hamburg Drehanodenröntgenröhre
US4698835A (en) * 1984-05-31 1987-10-06 Kabushiki Kaisha Toshiba X-ray tube apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2107597A (en) * 1932-06-27 1938-02-08 Philips Nv High voltage discharge tube
US3549931A (en) * 1968-12-04 1970-12-22 Torr Lab Inc X-ray transmissive window assembly
US4309637A (en) * 1979-11-13 1982-01-05 Emi Limited Rotating anode X-ray tube

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5511104A (en) * 1994-03-11 1996-04-23 Siemens Aktiengesellschaft X-ray tube

Also Published As

Publication number Publication date
US5008917A (en) 1991-04-16
JPH02223143A (ja) 1990-09-05
DE3838539A1 (de) 1990-05-17

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Effective date: 19901121

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