EP0445324A1 - Intensificateur d'images de rayons x avec système d'électrodes - Google Patents

Intensificateur d'images de rayons x avec système d'électrodes Download PDF

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Publication number
EP0445324A1
EP0445324A1 EP90104289A EP90104289A EP0445324A1 EP 0445324 A1 EP0445324 A1 EP 0445324A1 EP 90104289 A EP90104289 A EP 90104289A EP 90104289 A EP90104289 A EP 90104289A EP 0445324 A1 EP0445324 A1 EP 0445324A1
Authority
EP
European Patent Office
Prior art keywords
electrode
ray image
image intensifier
holder
insulating body
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Withdrawn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
EP90104289A
Other languages
German (de)
English (en)
Inventor
Reiner Dipl.-Ing.(Fh) Heumann
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 EP90104289A priority Critical patent/EP0445324A1/fr
Priority to US07/649,975 priority patent/US5091639A/en
Priority to JP1991019784U priority patent/JPH0499351U/ja
Publication of EP0445324A1 publication Critical patent/EP0445324A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J31/00—Cathode ray tubes; Electron beam tubes
    • H01J31/08—Cathode ray tubes; Electron beam tubes having a screen on or from which an image or pattern is formed, picked up, converted, or stored
    • H01J31/50—Image-conversion or image-amplification tubes, i.e. having optical, X-ray, or analogous input, and optical output
    • H01J31/501—Image-conversion or image-amplification tubes, i.e. having optical, X-ray, or analogous input, and optical output with an electrostatic electron optic system
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/82—Mounting, supporting, spacing, or insulating electron-optical or ion-optical arrangements

Definitions

  • the invention relates to an X-ray image intensifier with an electrode system for focusing the electrons generated when X-rays strike an input fluorescent screen onto an output fluorescent screen.
  • X-ray image intensifiers are used in X-ray diagnostics in order to convert an X-ray silhouette generated when X-rays are X-rayed to a patient into a visible image.
  • a television recording tube is connected, the output signals of which are fed to a monitor via a television chain.
  • the examination area is displayed as an image on the monitor.
  • the X-ray image intensifier has a vacuum vessel with an input fluorescent screen on one end face with a photocathode and an electrode system for accelerating and focusing the electrons generated when X-rays strike the input fluorescent screen onto an output fluorescent screen of the X-ray image intensifier arranged on the other face side.
  • the electrode system has a plurality of cylindrical or ring-shaped electrodes with different diameters to which different voltages are applied in order to focus the electrons generated at a point on the input fluorescent screen onto a corresponding point on the output fluorescent screen. These electrodes are attached as cylindrical rings, each with a holder, to the inner wall of the vacuum vessel.
  • each electrode there must therefore be at least one holder for each electrode, which is connected to the inner wall of the vacuum vessel.
  • Such an electrode system is very complex to manufacture, since a special holder is required for each electrode.
  • the assembly time is increased because the electrodes have to be adjusted.
  • the object of the invention is therefore to design an X-ray image intensifier of the type mentioned at the outset in such a way that its production is less complex and the assembly time required is reduced.
  • an X-ray image intensifier with an electrode system for focusing the electrons generated when an X-ray beam strikes an input fluorescent screen onto an output fluorescent screen, the electrode system having an annular electrode which is held by an annular holder such that between the electrode and the holder there is a clamp connection, solved.
  • the advantage of the invention is that there is no need for mounting elements of the electrode, one end of which has to be attached to the cylindrical wall part of the X-ray image intensifier and the other end of which has to be attached to the electrode, for example by soldering.
  • This holder could be damaged by vibration, with the result that the electrode detaches from the holder or the electrode is misaligned.
  • the attachment of the electrode according to the invention by clamping an insulating body on a holder requires only a small amount of time, no separate holder elements have to be produced. The risk of misalignment or damage to the electrode holder is reduced.
  • annular holder is electrically conductive, at least one insulating body is particularly advantageously clamped between the annular holder and the electrode.
  • the electrode has a recess into which the insulating body engages and the electrode is held in a snap connection by the holder by spring force.
  • the insulating body is thus held in the recess, so that an exact positioning of the electrode is possible.
  • the assembly of the electrode is particularly simple since it is stored on the holder due to residues and is therefore positioned at the same time. The risk of the electrode loosening or the electrode being misaligned when the X-ray image intensifier is shaken is further reduced.
  • the holder is designed as a second annular electrode, since a holder for the second electrode, which is connected to the inner wall of the vacuum vessel, can be dispensed with. Since the additional holder can be dispensed with and there are therefore fewer parts in the vacuum vessel, the stability of the high vacuum is increased.
  • each area of the electrode has a groove for receiving the insulating body, which is formed by ceramic balls.
  • the electrode can be positioned particularly precisely with little manufacturing and assembly effort. There is no need to adjust the electrode.
  • FIG. 1 shows a section of an X-ray image intensifier with the parts essential for the invention.
  • the almost cylindrical jacket of the X-ray image intensifier is identified by reference number 1.
  • a first electrode 2, a second electrode 3 and a third electrode 4 are located within this jacket 1.
  • a holder for the first electrode 2 is identified by reference number 5.
  • the exit fluorescent screen would follow from the holder 5 to the left and the input fluorescent screen of the X-ray image intensifier to the right.
  • the first electrode 2 has a region 6 which is connected to a region 8 of the second electrode 3 via an insulating body 7.
  • the regions 6 and 8 are cylindrical in shape, a groove 9 advantageously being provided in the region 6 of the first electrode 2 and a groove 10 in the region 8 of the second electrode 3, which are located opposite one another.
  • the insulating body 7 which is designed, for example, as a shaped ceramic body.
  • the shaped ceramic body can be formed, for example, by ceramic balls, a ceramic ring or by ceramic ring segments.
  • the area 11 of the first electrode 2 can be shrunk onto the holder 5. Then the insulating body 7 is arranged in the groove 9. After the area 8 of the second electrode 3 has been heated and has thus widened, it is pushed over the area 6 of the first electrode 2 and the insulating body 7. After cooling, the area 8 is shrunk onto the area 6 and the insulating body 7.
  • the spacing of the areas 6 and 8 from one another is predetermined by the insulating body 7 and is dimensioned such that no voltage flashover between the electrodes 2, 3 and in particular the areas 6, 8 can occur during operation of the X-ray image intensifier.
  • the same method is used to attach the third electrode 4 to the second electrode 3.
  • a quick and easy-to-assemble electrode system of an X-ray image intensifier is thus obtained, in which it is possible to dispense with holders for the electrodes which are connected to the jacket 1 of the X-ray image intensifier. Due to the cylindrical regions 6 and 8, the electrodes are held so stably that vibration of the X-ray image intensifier does not lead to any misalignment of the electrodes. It is not necessary to adjust the electrodes, since the grooves 9, 10 and the insulating body 7 made of a ceramic molded body position the electrodes 2, 3, 4 in an optimal arrangement.
  • contact pins 12, 13, 14 can be provided, one end of which is guided in a vacuum-tight manner with the respective electrode 2, 3, 4 and the other end of which is guided through the jacket 1 of the X-ray image intensifier.
  • the electrodes are shrunk onto one another via an insulating body. Additional mounting elements can thus be dispensed with.
  • the invention also includes only a single electrode which is shrunk onto a holder.
  • FIG. 2 shows a section of a cylindrical wall part 15 of an X-ray image intensifier, which has a groove 17 for holding an electrode 16.
  • This groove 17 can be formed in the surface 18 extending transversely along the inner surface 18 of the cylindrical wall part 15 and to the longitudinal axis 19 of the cylindrical wall part 15. However, it is also possible to provide recesses in the surface 18 which are spaced apart from one another.
  • the electrode 16 has in its outer surface 20, i.e. the surface facing the cylindrical wall part 15, resilient tabs 22, which are formed by slots 23 in the surface of the electrode 16. In the assembled state of the electrode, a bead 21 of the resilient tabs 22 engages in the groove 17.
  • the electrode 16 is inserted, for example, from the left into the cylindrical wall part 15, the tabs 22 being pressed inwards in a springy manner by the bead 21.
  • the bead 21 snaps into the groove 17, so that the electrode 16 is positioned and held in the cylindrical wall part 15.
  • This mounting and positioning of the electrode is only to be understood as an example.
  • the bulge 21 of the electrode 16 can also be designed as a groove if the surface 18 has a bulge.
  • This mounting of the electrode 16 is suitable if the cylindrical wall part 15 is not electrically conductive.
  • an insulating body is to be provided between the cylindrical wall part 15 and the tab 22. This insulating body can then engage, for example, in the groove 17 of the cylindrical wall part 15 and in a recess in the tab 22, so that it is kept clamped in the positioned state of the electrode 16.

Landscapes

  • Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)
EP90104289A 1990-03-06 1990-03-06 Intensificateur d'images de rayons x avec système d'électrodes Withdrawn EP0445324A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP90104289A EP0445324A1 (fr) 1990-03-06 1990-03-06 Intensificateur d'images de rayons x avec système d'électrodes
US07/649,975 US5091639A (en) 1990-03-06 1991-02-04 Mount for an electrode system in an x-ray image intensifier
JP1991019784U JPH0499351U (fr) 1990-03-06 1991-03-05

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP90104289A EP0445324A1 (fr) 1990-03-06 1990-03-06 Intensificateur d'images de rayons x avec système d'électrodes

Publications (1)

Publication Number Publication Date
EP0445324A1 true EP0445324A1 (fr) 1991-09-11

Family

ID=8203724

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90104289A Withdrawn EP0445324A1 (fr) 1990-03-06 1990-03-06 Intensificateur d'images de rayons x avec système d'électrodes

Country Status (3)

Country Link
US (1) US5091639A (fr)
EP (1) EP0445324A1 (fr)
JP (1) JPH0499351U (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5642395A (en) * 1995-08-07 1997-06-24 Oec Medical Systems, Inc. Imaging chain with miniaturized C-arm assembly for mobile X-ray imaging system

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3835314A (en) * 1973-03-05 1974-09-10 Machlett Lab Inc Intensifier radiographic imaging system
US4585935A (en) * 1984-02-10 1986-04-29 Rca Corporation Electron discharge device having a substantially spherical electrostatic field lens

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2523406A (en) * 1949-06-25 1950-09-26 Remington Rand Inc Insulated anode for cathode-ray tubes
DE2213493C3 (de) * 1972-03-20 1980-02-28 Siemens Ag, 1000 Berlin Und 8000 Muenchen Elektronische Bildverstärkerröhre, bei der ein elektrisch leitendes TeU mit einer elektrisch isolierenden Schicht versehen ist, und Verfahren zur Herstellung dieser Schicht
US3809889A (en) * 1972-12-29 1974-05-07 Gen Electric Image intensifier compensated for earth{40 s magnetic field
US4140900A (en) * 1976-11-12 1979-02-20 Diagnostic Information, Inc. Panel type x-ray image intensifier tube and radiographic camera system
US4315184A (en) * 1980-01-22 1982-02-09 Westinghouse Electric Corp. Image tube
US4554479A (en) * 1983-12-08 1985-11-19 Rca Corporation Cathode-ray tube having a low power cathode assembly
NL8602629A (nl) * 1986-10-21 1988-05-16 Philips Nv Roentgenbeeldversterkerbuis met een scheidingslaag tussen de luminescentielaag en de photocathode.
GB8707170D0 (en) * 1987-03-25 1987-04-29 Philips Nv Electron beam device
FR2629267B1 (fr) * 1988-03-22 1996-01-26 Thomson Csf Dispositif de conversion chromatique d'une image obtenue en rayonnement electromagnetique et procede de fabrication correspondant
DE3889454D1 (de) * 1988-09-29 1994-06-09 Siemens Ag Röntgenbildverstärker.

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3835314A (en) * 1973-03-05 1974-09-10 Machlett Lab Inc Intensifier radiographic imaging system
US4585935A (en) * 1984-02-10 1986-04-29 Rca Corporation Electron discharge device having a substantially spherical electrostatic field lens

Also Published As

Publication number Publication date
US5091639A (en) 1992-02-25
JPH0499351U (fr) 1992-08-27

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