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EP0360906B1 - X-ray image intensifier - Google Patents

X-ray image intensifier Download PDF

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Publication number
EP0360906B1
EP0360906B1 EP88116129A EP88116129A EP0360906B1 EP 0360906 B1 EP0360906 B1 EP 0360906B1 EP 88116129 A EP88116129 A EP 88116129A EP 88116129 A EP88116129 A EP 88116129A EP 0360906 B1 EP0360906 B1 EP 0360906B1
Authority
EP
European Patent Office
Prior art keywords
image intensifier
ray image
electrodes
wall part
cylindrical wall
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 - Lifetime
Application number
EP88116129A
Other languages
German (de)
French (fr)
Other versions
EP0360906A1 (en
Inventor
Richard Frank
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 DE3889454T priority Critical patent/DE3889454D1/en
Priority to EP88116129A priority patent/EP0360906B1/en
Priority to US07/405,218 priority patent/US4960987A/en
Priority to JP1989110828U priority patent/JP2584520Y2/en
Publication of EP0360906A1 publication Critical patent/EP0360906A1/en
Application granted granted Critical
Publication of EP0360906B1 publication Critical patent/EP0360906B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • H01J29/86—Vessels; Containers; Vacuum locks
    • H01J29/88—Vessels; Containers; Vacuum locks provided with coatings on the walls thereof; Selection of materials for the coatings
    • 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
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/88—Coatings
    • H01J2229/885—Coatings having particular electrical insulation properties

Definitions

  • the invention relates to an image intensifier with a vacuum vessel with an entrance fluorescent screen located on one end face and with an electrode system for focusing electrons on an exit fluorescent screen arranged on the other end face, a cylindrical wall part of the vacuum vessel between the entrance fluorescent screen and the exit fluorescent screen having different diameters, and wherein the Electrodes are each applied as a coating on the inside of the wall part in the area of the different diameter.
  • 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 with a photocathode located on one end face 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 end face.
  • 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 luminescent screen onto a corresponding point on the Home screen.
  • Electrodes are attached to the inner wall of the vacuum vessel as cylindrical rings, each with a holder.
  • the manufacture of the electrode system is very complex since each electrode has to be manufactured individually.
  • a holder must be provided for each electrode in order to hold it in the vacuum vessel.
  • the assembly time is increased because the electrodes have to be adjusted.
  • an image intensifier is known with a glass vacuum vessel with an entrance fluorescent screen located on one end face and with an electrode system for focusing electrons on an exit fluorescent screen arranged on the other end face.
  • a cylindrical wall part of the vacuum vessel which is made of glass and is arranged between the entrance fluorescent screen and the exit fluorescent screen, has different diameters.
  • the electrodes are each applied as a coating on the inside of the wall part in the area of the different diameters.
  • the object of the invention is to design an image intensifier of the type mentioned at the outset, in particular as an X-ray image intensifier, in such a way that the production outlay for the electrode system and thus the production costs are reduced.
  • the image intensifier is designed as an X-ray image intensifier, that the cylindrical wall part of the X-ray image intensifier is formed from a one-piece sheet metal part, that the shape of the cylindrical wall part is adapted to the electrodes and, for this purpose, has different lengths adapted to the required electrode diameters Has diameter and that the inside of the sheet metal part has an insulation layer on which the electrodes are applied.
  • the cylindrical wall part of the X-ray image intensifier is formed from a one-piece sheet metal part, that on the inside of the sheet metal part an insulation layer is applied and that the Electruden are applied to this.
  • the electrode system is thus combined to form an overall electrode, as a result of which the production costs and the assembly outlay are low.
  • the surface of the electrodes is reduced, which has an advantageous effect on the stability of the high vacuum in the vacuum vessel. Because the holders for the electrodes are omitted, the construction volume of the vacuum vessel can be reduced.
  • FIG. 1 shows an X-ray diagnostic device with a high-voltage generator 1 which feeds an X-ray tube 2, in the beam path of which there is a patient 3 who generates a radiation image on the fluorescent screen 4 of an X-ray image intensifier 5.
  • the electrons emerging from the input fluorescent screen 4 are focused by the electrodes of an electron optics 6 onto the output fluorescent screen 7 of the X-ray image intensifier 5.
  • Voltage sources 8 to 10 supply the X-ray image intensifier 5 with the required acceleration and deflection voltages.
  • the X-ray image intensifier 5 and the television chain can be used to display the X-ray silhouette generated when the patient 3 is illuminated as an image on the screen of the monitor 13.
  • FIG. 2 shows a first exemplary embodiment of an X-ray image intensifier 5a according to the invention in a sectional, basic illustration.
  • the elements designated in FIG. 1 are provided with the same reference symbols in FIG.
  • the cylindrical wall of the X-ray image intensifier 5a is formed by an electrode carrier 14 which is formed from sheet metal. It is connected to the entrance fluorescent screen 4 and is fused into the glass wall 16 with a fastening edge 15.
  • An insulation layer 17 is applied to the inside of the electrode carrier 14. The thickness of the insulation layer depends on the required operating voltage of the electrodes and the resulting dielectric strength.
  • the insulation layer 17 can consist, for example, of a lacquer, ceramic, glass or advantageously a metal oxide, such as aluminum oxide or aluminum-titanium oxide, which is applied by a spraying method, such as plasma spraying or by brushing.
  • the figure shows that an electrically conductive coating is applied to areas of the electrode carrier 14, so that the electrodes 18 and 19 are formed.
  • the conductive covering can be applied to the corresponding areas the insulation layer 17 of the X-ray image intensifier 5a by brushing or by a spraying method, such as plasma spraying, for example. It is also possible to remove the coating on the entire inner surface of the electrode carrier 14, that is to say on the insulation layer 17, in order to subsequently remove it at regions between adjacent electrodes 18 and 19 by mechanical removal, for example grinding.
  • a conductor 20 is led for each electrode 18, 19, through the electrode carrier 14, to the electrically conductive covering and connected to it.
  • voltage sources (not shown) can be connected to the conductor 20.
  • the exemplary embodiment according to FIG. 2 shows an image intensifier 5a with two electrodes 18, 19. It is of course also possible to provide further electrodes and to design the electrode carrier accordingly.
  • the electrode carrier does not have to be stepped, as shown in FIG. 2, it can also be conical. It is essential that the electrodes are formed by an electrically conductive coating which is applied to a one-piece electrode carrier.

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  • Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)

Description

Die Erfindung betrifft einen Bildverstärker mit einem Vakuumgefäß mit einem an einer Stirnseite befindlichen Eingangsleuchtschirm und mit einem Elektrodensystem zum Fokussieren von Elektronen auf einen auf der anderen Stirnseite angeordneten Ausgangsleuchtschirm, wobei ein zylindrisches Wandteil des Vakuumgefäßes zwischen dem Eingangsleuchtschirm und dem Ausgangsleuchtschirm unterschiedliche Durchmesser aufweist und wobei die Elektroden jeweils als Belag auf der Innenseite des Wandteiles im Bereich des unterschiedlichen Durchmessers aufgebracht sind.The invention relates to an image intensifier with a vacuum vessel with an entrance fluorescent screen located on one end face and with an electrode system for focusing electrons on an exit fluorescent screen arranged on the other end face, a cylindrical wall part of the vacuum vessel between the entrance fluorescent screen and the exit fluorescent screen having different diameters, and wherein the Electrodes are each applied as a coating on the inside of the wall part in the area of the different diameter.

Röntgenbildverstärker werden in der Röntgendiagnostik eingesetzt, um ein beim Durchleuchten eines Patienten mit Röntgenstrahlen erzeugtes Röntgenschattenbild in ein sichtbares Bild zu wandeln. Am Ausgang des Röntgenbildverstärkers ist eine Fernsehaufnahmeröhre angeschlossen, deren Ausgangssignale über eine Fernsehkette einem Monitor zugeführt werden. Der Untersuchungsbereich wird als Bild auf dem Monitor dargestellt.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. At the output of the X-ray image intensifier, 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.

Ein bekannter Röntgenbildverstärker ist in dem Buch "Das Röntgenfernsehen" von A. Gebauer et al, erschienen 1974 im Georg Thieme Verlag, Stuttgart, auf den Seiten 54 bis 56 beschrieben. Der Röntgenbildverstärker besitzt ein Vakuumgefäß mit einem an einer Stirnseite befindlichen Eingangsleuchtschirm mit Photokathode und ein Elektrodensystem zum Beschleunigen und Fokussieren der beim Auftreffen von Röntgenstrahlung auf dem Eingangsleuchtschirm erzeugten Elektronen auf einen auf der anderen Stirnseite angeordneten Ausgangsleuchtschirm des Röntgenbildverstärkers. Das Elektrodensystem besitzt mehrere zylinder- oder ringförmige Elektroden mit unterschiedlichen Durchmessern, an die unterschiedliche Spannungen gelegt sind zum Fokussieren der an einem Punkt des Eingangsleuchtschirms erzeugten Elektronen auf einen entsprechenden Punkt des Ausgangsleuchtschirms. Diese Elektroden sind als zylinderförmige Ringe mit jeweils einer Halterung an der Innenwand des Vakuumgefäßes befestigt. Die Herstellung des Elektrodensystems ist sehr aufwendig, da jede Elektrode einzeln hergestellt werden muß. Für jede Elektrode muß eine Halterung vorgesehen sein, um diese im Vakuumgefäß zu haltern. Die Montagezeit ist erhöht, weil die Elektroden justiert werden müssen.A known x-ray image intensifier is described in the book "Das Röntgenfernsehen" by A. Gebauer et al, published in 1974 by Georg Thieme Verlag, Stuttgart, on pages 54 to 56. The X-ray image intensifier has a vacuum vessel with an input fluorescent screen with a photocathode located on one end face 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 end face. 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 luminescent screen onto a corresponding point on the Home screen. These electrodes are attached to the inner wall of the vacuum vessel as cylindrical rings, each with a holder. The manufacture of the electrode system is very complex since each electrode has to be manufactured individually. A holder must be provided for each electrode in order to hold it in the vacuum vessel. The assembly time is increased because the electrodes have to be adjusted.

Aus der US-A-3,688,146 ist ein Bildverstärker mit einem aus Glas bestehenden Vakuumgefäß mit einem an einer Stirnseite befindlichen Eingangsleuchtschirm und mit einem Elektrodensystem zum Fokussieren von Elektronen auf einen auf der anderen Stirnseite angeordneten Ausgangsleuchtschirm bekannt. Ein zwischen dem Eingangsleuchtschirm und dem Ausgangsleuchtschirm angeordnetes, aus Glas bestehendes zylindrisches Wandteil des Vakuumgefäßes weist unterschiedliche Durchmesser auf. Die Elektroden sind jeweils als Belag auf der Innenseite des Wandteiles im Bereich der unterschiedlichen Durchmesser aufgebracht.From US-A-3,688,146 an image intensifier is known with a glass vacuum vessel with an entrance fluorescent screen located on one end face and with an electrode system for focusing electrons on an exit fluorescent screen arranged on the other end face. A cylindrical wall part of the vacuum vessel, which is made of glass and is arranged between the entrance fluorescent screen and the exit fluorescent screen, has different diameters. The electrodes are each applied as a coating on the inside of the wall part in the area of the different diameters.

Aufgabe der Erfindung ist es, einen Bildverstärker der eingangs genannten Art insbes. als Röntgenbildverstärker so auszuführen, daß der Herstellungsaufwand für das Elektrodensystem und damit die Kosten zur Herstellung reduziert sind.The object of the invention is to design an image intensifier of the type mentioned at the outset, in particular as an X-ray image intensifier, in such a way that the production outlay for the electrode system and thus the production costs are reduced.

Die Aufgabe wird erfindungsgemäß dadurch gelöst, daß der Bildverstärker als Röntgenbildverstärker ausgeführt ist, daß der zylindrische Wandteil des Röntgenbildverstärkers von einem einstückigen Blechteil gebildet wird, daß der zylindrische Wandteil in seiner Form den Elektroden angepaßt ist und hierzu über seine Länge unterschiedliche, den erforderlichen Elektrodendurchmessern angepaßte Durchmesser aufweist und daß die Innenseite des Blechteiles eine Isolationsschicht aufweist, auf der die Elektroden aufgebracht sind.The object is achieved in that the image intensifier is designed as an X-ray image intensifier, that the cylindrical wall part of the X-ray image intensifier is formed from a one-piece sheet metal part, that the shape of the cylindrical wall part is adapted to the electrodes and, for this purpose, has different lengths adapted to the required electrode diameters Has diameter and that the inside of the sheet metal part has an insulation layer on which the electrodes are applied.

Vorteil der Erfindung ist, daß der zylindrische Wandteil des Röntgenbildverstärkers aus einem einstückigen Blechteil gebildet ist, daß auf der Innenseite des Blechteils eine Isolationsschicht aufgebracht ist und daß auf dieser die Elektruden aufgebracht sind. Damit ist das Elektrodensystem zu einer Gesamtelektrode zusammengefaßt, wodurch die Herstellungskosten und der Montageaufwand gering sind. Dadurch, daß die Elektroden als Belag auf der Innenseite des Wandteiles des Röntgengenbildverstärkers zwischen den Leuchtschirmen aufgebracht sind, ist die Herstellung des Elektrodensystems wesentlich vereinfacht, eine Justierung und die Halterungen der Elektroden im Vakuumgefäß können entfallen, so daß der Montageaufwand und die Herstellungskosten ebenfalls reduziert sind. Zudem ist die Oberfläche der Elektroden reduziert, was sich vorteilhaft auf die Stabilität des Hochvakuums im Vakuumgefäß auswirkt. Dadurch, daß die Halterungen der Elektroden entfallen, kann das Bauvolumen des Vakuumgefäßes reduziert werden.Advantage of the invention is that the cylindrical wall part of the X-ray image intensifier is formed from a one-piece sheet metal part, that on the inside of the sheet metal part an insulation layer is applied and that the Electruden are applied to this. The electrode system is thus combined to form an overall electrode, as a result of which the production costs and the assembly outlay are low. The fact that the electrodes are applied as a coating on the inside of the wall part of the X-ray image intensifier between the fluorescent screens, the manufacture of the electrode system is significantly simplified, adjustment and the holders of the electrodes in the vacuum vessel can be omitted, so that the assembly effort and the manufacturing costs are also reduced . In addition, the surface of the electrodes is reduced, which has an advantageous effect on the stability of the high vacuum in the vacuum vessel. Because the holders for the electrodes are omitted, the construction volume of the vacuum vessel can be reduced.

Weitere Vorteile und Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung von Ausführungsbeispielen anhand der Zeichnungen in Verbindung mit den Unteransprüchen. Dabei zeigt:

FIG 1
die prinzipielle Darstellung einer Röntgendiagnostikeinrichtung mit einem Röntgenbildverstärker nach dem Stand der Technik und
FIG 2
ein Ausführungsbeispiel eines Röntgenbildverstärkers nach der Erfindung.
Further advantages and details of the invention emerge from the following description of exemplary embodiments with reference to the drawings in conjunction with the subclaims. It shows:
FIG. 1
the basic representation of an X-ray diagnostic device with an X-ray image intensifier according to the prior art and
FIG 2
an embodiment of an X-ray image intensifier according to the invention.

In der FIG 1 ist eine Röntgendiagnostikeinrichtung mit einem Hochspannungsgenerator 1 dargestellt, der eine Röntgenröhre 2 speist, in deren Strahlengang sich ein Patient 3 befindet, der auf dem Eingangsleuchtschirm 4 eines Röntgenbildverstärkers 5 ein Strahlenbild erzeugt. Die aus dem Eingangsleuchtschirm 4 austretenden Elektronen werden durch die Elektroden einer Elektronenoptik 6 auf den Ausgangsleuchtschirm 7 des Röntgenbildverstärkers 5 fokussiert. Spannungsquellen 8 bis 10 versorgen den Röntgenbildverstärker 5 mit den erforderlichen Beschleunigungs- und Ablenkspannungen. An dem Ausgang des Röntgenbildverstärkers 5 ist eine übliche Fernsehkette mit einer Bildaufnahmeeinrichtung 11 mit einer Signalverarbeitungseinheit 12 und einem Monitor 13 angeschlossen. Durch den Röntgenbildverstärker 5 und die Fernsehkette ist das beim Durchleuchten des Patienten 3 erzeugte Röntgenschattenbild als Bild auf dem Bildschirm des Monitors 13 darstellbar.1 shows an X-ray diagnostic device with a high-voltage generator 1 which feeds an X-ray tube 2, in the beam path of which there is a patient 3 who generates a radiation image on the fluorescent screen 4 of an X-ray image intensifier 5. The electrons emerging from the input fluorescent screen 4 are focused by the electrodes of an electron optics 6 onto the output fluorescent screen 7 of the X-ray image intensifier 5. Voltage sources 8 to 10 supply the X-ray image intensifier 5 with the required acceleration and deflection voltages. At the output of the X-ray image intensifier 5 there is a conventional television chain with an image recording device 11 with a signal processing unit 12 and a monitor 13 connected. The X-ray image intensifier 5 and the television chain can be used to display the X-ray silhouette generated when the patient 3 is illuminated as an image on the screen of the monitor 13.

Die FIG 2 zeigt ein erstes Ausführungsbeispiel eines erfindungsgemäßen Röntgenbildverstärkers 5a in einer geschnittenen, prinzipiellen Darstellung. Die in der FIG 1 bezeichneten Elemente sind in der FIG 2 mit gleichen Bezugszeichen versehen. Die zylindrische Wand des Röntgenbildverstärkers 5a ist von einem Elektrodenträger 14 gebildet, der aus Blech geformt ist. Er steht mit dem Eingangsleuchtschirm 4 in Verbindung und ist mit einem Befestigungsrand 15 in die Glaswand 16 eingeschmolzen. Auf der Innenseite des Elektrodenträgers 14 ist eine Isolationsschicht 17 aufgebracht. Die Isolationsschichtstärke richtet sich nach der jeweils geforderten Betriebsspannung der Elektroden und der dadurch notwendigen Durchschlagsfestigkeit. Die Isolationsschicht 17 kann beispielsweise aus einem Lack, Keramik, Glas oder vorteilhaft aus einem Metalloxid, wie Aluminiumoxid oder Aluminium-Titanoxid, bestehen, das durch ein Spritzverfahren, wie beispielsweise Plasmaspritzen oder durch Streichen aufgetragen wird.2 shows a first exemplary embodiment of an X-ray image intensifier 5a according to the invention in a sectional, basic illustration. The elements designated in FIG. 1 are provided with the same reference symbols in FIG. The cylindrical wall of the X-ray image intensifier 5a is formed by an electrode carrier 14 which is formed from sheet metal. It is connected to the entrance fluorescent screen 4 and is fused into the glass wall 16 with a fastening edge 15. An insulation layer 17 is applied to the inside of the electrode carrier 14. The thickness of the insulation layer depends on the required operating voltage of the electrodes and the resulting dielectric strength. The insulation layer 17 can consist, for example, of a lacquer, ceramic, glass or advantageously a metal oxide, such as aluminum oxide or aluminum-titanium oxide, which is applied by a spraying method, such as plasma spraying or by brushing.

Die Figur zeigt, daß ein elektrisch leitender Belag auf Bereiche des Elektrodenträgers 14, aufgetragen ist, so daß die Elektroden 18, und 19, gebildet sind. Hierzu kann der leitende Belag auf die entsprechenden Bereiche der Isolationsschicht 17 des Röntgenbildverstärkers 5a durch Streichen oder durch ein Spritzverfahren, wie z.B. Plasmaspritzen, aufgetragen sein. Es ist auch möglich, den Belag auf die gesamte Innenfläche des Elektrodenträgers 14, also auf die Isolationsschicht 17, um ihn anschließend an Bereichen zwischen benachbarten Elektroden 18, und 19, durch mechanisches Abtragen, z.B. Schleifen, zu entfernen.The figure shows that an electrically conductive coating is applied to areas of the electrode carrier 14, so that the electrodes 18 and 19 are formed. For this purpose, the conductive covering can be applied to the corresponding areas the insulation layer 17 of the X-ray image intensifier 5a by brushing or by a spraying method, such as plasma spraying, for example. It is also possible to remove the coating on the entire inner surface of the electrode carrier 14, that is to say on the insulation layer 17, in order to subsequently remove it at regions between adjacent electrodes 18 and 19 by mechanical removal, for example grinding.

Ein Leiter 20 ist für jede Elektrode 18, 19, durch den Elektrodenträger 14, zu dem elektrisch leitenden Belag geführt und mit diesem verbunden. Zur Spannungsversorgung der Elektroden 18, und 19, sind an den Leiter 20 nicht gezeigte Spannungsquellen anschließbar.A conductor 20 is led for each electrode 18, 19, through the electrode carrier 14, to the electrically conductive covering and connected to it. To supply the electrodes 18 and 19 with voltage, voltage sources (not shown) can be connected to the conductor 20.

Das Ausführungsbeipsiel nach der FIG 2 zeigt einen Bildverstärker 5a, mit zwei Elektroden 18, 19. Es ist selbstverständlich auch möglich, weitere Elektroden vorzusehen und den Elektrodenträger entsprechend auszubilden. Hierzu muß der Elektrodenträger nicht, wie in der FIG 2 gezeigt, stufig ausgebildet sein, er kann auch konisch sein. Wesentlich ist, daß die Elektroden von einem elektrisch leitenden Belag gebildet sind, der auf einen einstückigen Elektrodenträger aufgebracht ist.The exemplary embodiment according to FIG. 2 shows an image intensifier 5a with two electrodes 18, 19. It is of course also possible to provide further electrodes and to design the electrode carrier accordingly. For this purpose, the electrode carrier does not have to be stepped, as shown in FIG. 2, it can also be conical. It is essential that the electrodes are formed by an electrically conductive coating which is applied to a one-piece electrode carrier.

Claims (3)

  1. Image intensifier (5a) having a vacuum container with an input luminescent screen (4) located on an end face and having an electrode system (18, 19) for focusing electrons on to an output luminescent screen (7) arranged on the other end face, a cylindrical wall part of the vacuum container having varying diameters between the input luminescent screen (4) and the output luminescent screen (7), and the electrodes being applied in each case as a coating to the inside of the wall part in the region of the varying diameters, characterised in that the image intensifier (5a) is designed as an X-ray image intensifier, in that the cylindrical wall part of the X-ray image intensifier (5a) is formed from a one-piece sheet metal part, in that the shape of the cylindrical wall part is adapted to the electrodes and has over its length, for this purpose, varying diameters adapted to the required electrode diameters, and in that the inside of the sheet metal part has an insulating layer (17) to which the electrodes (18, 19) are applied
  2. Image intensifier according to claim 1, characterised in that the insulating layer (17) is formed from aluminium oxide.
  3. X-ray image intensifier according to claim 1, characterised in that the insulating layer (17) consists of aluminium titanium oxide.
EP88116129A 1988-09-29 1988-09-29 X-ray image intensifier Expired - Lifetime EP0360906B1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE3889454T DE3889454D1 (en) 1988-09-29 1988-09-29 X-ray image intensifier.
EP88116129A EP0360906B1 (en) 1988-09-29 1988-09-29 X-ray image intensifier
US07/405,218 US4960987A (en) 1988-09-29 1989-09-11 X-ray image intensifier with conductive-coat electrodes on insulated metal sidewalls
JP1989110828U JP2584520Y2 (en) 1988-09-29 1989-09-20 X-ray image intensity

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP88116129A EP0360906B1 (en) 1988-09-29 1988-09-29 X-ray image intensifier

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EP0360906A1 EP0360906A1 (en) 1990-04-04
EP0360906B1 true EP0360906B1 (en) 1994-05-04

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DE (1) DE3889454D1 (en)

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JP3492777B2 (en) * 1993-10-29 2004-02-03 株式会社東芝 Radiation image intensifier tube and method of manufacturing the same
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DE19641625A1 (en) * 1996-10-09 1998-04-16 Siemens Ag X-ray image intensifier with vessel for accommodating electrodes
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US4960987A (en) 1990-10-02
DE3889454D1 (en) 1994-06-09
JP2584520Y2 (en) 1998-11-05
EP0360906A1 (en) 1990-04-04
JPH0249057U (en) 1990-04-05

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