EP0165851B1 - Vakuumkolben für Strahlungsbildverstärker und Verfahren zu seiner Herstellung - Google Patents

Vakuumkolben für Strahlungsbildverstärker und Verfahren zu seiner Herstellung Download PDF

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Publication number
EP0165851B1
EP0165851B1 EP85401037A EP85401037A EP0165851B1 EP 0165851 B1 EP0165851 B1 EP 0165851B1 EP 85401037 A EP85401037 A EP 85401037A EP 85401037 A EP85401037 A EP 85401037A EP 0165851 B1 EP0165851 B1 EP 0165851B1
Authority
EP
European Patent Office
Prior art keywords
skirt
alloy
annulus
window
aluminum
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
EP85401037A
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English (en)
French (fr)
Other versions
EP0165851A1 (de
Inventor
Gilbert Colomb
Jean-Pierre Creusot
Henri Rougeot
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.)
Thales SA
Original Assignee
Thomson CSF SA
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 Thomson CSF SA filed Critical Thomson CSF SA
Publication of EP0165851A1 publication Critical patent/EP0165851A1/de
Application granted granted Critical
Publication of EP0165851B1 publication Critical patent/EP0165851B1/de
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/24—Manufacture or joining of vessels, leading-in conductors or bases
    • H01J9/26—Sealing together parts of vessels
    • H01J9/263—Sealing together parts of vessels specially adapted for cathode-ray tubes

Definitions

  • the present invention relates to the structure of the vacuum envelope of radiation image intensifier tubes such as radiological image intensifier tubes, or similar electronic tubes.
  • the present invention also relates to a method of manufacturing these envelopes.
  • the vacuum envelopes of image intensifier tubes are constituted by a central body of revolution, by an inlet window intended for the passage of the radiation to be amplified, said window being connected to one end of the central body and by a transparent exit window connected to the other end of the central body.
  • Vacuum envelopes have thus been proposed comprising a concave entry window made of titanium or steel.
  • this type of window can remain sufficiently thin, therefore not very absorbent or diffusing for the radiation to be transmitted, and nevertheless sufficiently mechanically resistant to withstand pressure differences, it is necessary, due to the concave shape of the window, to lengthen the tube in order to incorporate the convex entry screen into it for the needs of electronic optics.
  • the sealing between the window and the central body can be carried out by thermocompression welding.
  • the convex window made of aluminum or aluminum alloy comprises an annular peripheral flange and the assembly between the window and the body requires either that the body comprises an annular flange perpendicular to the axis of the tube or the use of an L-shaped or S-shaped connection ring.
  • the parts to be welded must be in a plane perpendicular to the axis of the tube so as to be able to apply pressure between the two metals or alloys in which the window and the central body are made.
  • thermocompression welding process in particular when it is used to weld aluminum to an iron alloy such as stainless steel, requires a rise in temperature and a period of contact under pressure which require time. As a result, this process is industrially expensive.
  • Another solution of the prior art consists in making the window using a convex shaped part made of a material comprising a layer of copper plated on a layer of aluminum in which the layer of copper is removed in the part subjected to the radiation and the aluminum layer is removed at the edge formed by a flat surrounding the convex cap, reserving a localized overlap of the two layers.
  • the copper edge is then welded by electric arc welding along a lip formed on the central metal body which can be made of stainless steel.
  • the object of the present invention is to provide a new structure of a vacuum envelope for an image intensifier tube comprising an aluminum window which does not have the drawbacks of the structures of the prior art.
  • the present invention also aims to provide a new vacuum envelope structure for radiation image intensifier tube which is easy and quick to produce.
  • the subject of the present invention is a vacuum envelope for radiation image intensifier tubes or similar electronic tubes of the type comprising a central body and an aluminum or aluminum alloy entry window at one end of the body.
  • the entry window comprises a peripheral skirt which fits on a ring of the same section as the skirt, made of iron or an iron alloy secured to said end of the body, said skirt being welded so vacuum tight on the ring by magnetic induction welding.
  • the magnetic induction welding technique has been known for a long time for the welding of small diameter tubes having a good seal against the pressure of various fluids. It is described in particular in French patent No. 1,579,461. However, this technique has never been used in image intensifier tubes.
  • the vacuum envelope of the present invention when it is used for an image intensifier tube, essentially comprises a window 1 for entering the radiation to be detected, such as X-rays, a body central 2 of revolution, mainly constituted by a glass cylinder ending in an outlet window 3 forming an integral part of the body 2.
  • the main elements constituting the intensifier tube are shown diagrammatically inside the envelope. images such as photocathode 4, electrodes 5, 6, 7 for acceleration and focusing and an output screen 8 terminating the last electrode or anode 9.
  • the entry window 1 is made of aluminum or an aluminum alloy, preferably an aluminum and magnesium alloy such as Ag 4 MC which is rigid enough to withstand the pressure differences between the outside and inside the tube.
  • the entry window has the shape of a convex cap.
  • the entry window 1 comprises a peripheral skirt 10 which fits onto a ring 11 of the same section as the entry window extending the central body.
  • the entry window 1 comprises a peripheral part 1 'folded in a plane parallel to the axis of the tube.
  • the peripheral skirt 10 consists of a substantially T-shaped section ring made of aluminum or aluminum alloy, preferably aluminum, to facilitate welding on the ring 11 which is made of iron or iron alloy, preferably stainless steel as will be explained below.
  • a branch 10 'of the ring is welded to the peripheral part 1'.
  • the entry window 1 and the skirt 10 can be formed in one piece when they are made of the same material. As shown in FIG.
  • the skirt before being welded to the ring 11, the skirt ends in a flared part 10 "in a cone, the projection towards the inside of the tube, formed by the part" 1 "of the” T "allowing the end of the ring 11 to be supported.
  • the opening angle of the flared part 10" is between 1 and 30 ° relative to the axis of the tube.
  • an intermediate ring 12 is provided between the glass part of the central body 2 and the ring 11.
  • This intermediate ring is made of iron or an iron alloy, preferably in a iron-nickel-cobalt alloy such as the Dilver or an iron-nickel alloy such as the Carpenter.
  • the intermediate ring is provided to facilitate welding on the glass part, in particular when the ring 11 is made of stainless steel.
  • the two rings 11 and 12 can be formed in one piece when they are made of the same material.
  • the sealing is carried out by magnetic induction welding, more particularly by pulse magnetosoldering.
  • the ring 11 is mounted on a mandrel 13 and the flared end of the skirt 10 comes to fit on the ring 11.
  • the ring 11 and the skirt 10 at level of the fold both have a folded portion in the form of a notch of identical shape. This folded part gives rigidity to the stainless steel ring 11 and defines the point of rotation of the flared part of the skirt.
  • the cylindrical skirt 10 is surrounded by a magnetic induction coil L.
  • the coil L forms with a capacitance C and the switch 1 an oscillating circuit as shown in the figure 5.
  • the capacitor C is charged under high voltage and then discharged into the coil L.
  • the magnetic field which appears in the coil L creates an induction current having the form shown in FIG. 6, in the flared part of the skirt 10 made of aluminum which is a highly conductive material. This results in a mechanical force which has the effect of pressing the flared part of the skirt 10 onto the ring 11 of stainless steel as shown in FIG. 3.
  • the current induced in the flared part 10 is limited to the skin thickness. Consequently, the thickness of this flared part 10" has been chosen equal to the skin thickness. It is possible to choose a larger thickness, but in this case, the energy released during magnetic induction welding must be higher.
  • the manufacturing process according to the present invention is a rapid process since it is carried out by instantaneous discharge of a capacitor. It is therefore inexpensive on an industrial level. On the other hand, it makes it possible to seal two cylinders tightly one on the other, which gives a tube of overall diameter reduced compared to the tubes of the prior art. It is also possible with this method to reduce the diameter of the tube for a given field, which results in a reduction in the weight of the tube.
  • the present invention is not limited to image intensifier tubes, but that it can be applied to all electronic tubes having a vacuum enclosure with an aluminum or aluminum alloy window.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)

Claims (11)

1. Evakuierte Hülle für Strahlungs-Bildverstärkerröhre oder ähnliche Elektronenröhre vom Typ mit einem zentralen Körper (2) sowie einem Eintrittsfenster (1) das im wesentlichen denselben Durchmesser wie der zentrale Körper aufweist, dadurch gekennzeichnet, daß das aus Aluminium oder aus einer Aluminiumlegierung bestehende Eintrittsfenster (1) eine Umfangsschürze (10) umfaßt, die vor dem Schweißen eine sich erweiternde Kegelform aufweist und mit einem Vorsprung versehen ist, gegen welchen das Ende eines Ringes (11) gedrückt wird, der aus Eisen oder aus einer Eisenlegierung besteht und mit dem der zentrale Körper endet, wobei die genannte Schürze vakuumdicht auf dem Ring durch magnetische Induktion verschweißt ist.
2. Evakuierte Hülle nach Anspruch 1, dadurch gekennzeichnet, daß der Öffnungswinkel des erweiterten Teils zwischen 1 und 30° beträgt.
3. Evakuierte Hülle nach einem der Ansprüche 1 und 2, dadurch gekennzeichnet, daß die Dicke (e) des erweiterten Teils der Skin-Dicke entspricht, welche während des Schweißens durch magnetische Induktion von dem in dem Aluminium oder der Aluminiumlegierung induzierten Strom durchsetzt wird.
4. Evakuierte Hülle nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß das Eintrittsfenster aus dem eigentlichen Fenster (1) sowie aus der Schürze (10) besteht, wobei das eigentliche Fenster sowie die Schürze aus verschiedenen Materialen bestehen und vakuumdicht miteinander verbunden sind.
5. Evakuierte Hülle nach Anspruch 4, dadurch gekennzeichnet, daß das eigentliche Fenster (1) aus einer Aluminiumlegierung besteht, und daß die Schürze (10) aus Aluminium besteht.
6. Evakuierte Hülle nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß der Ring (11) aus einer Eisenlegierung aus rostfreiem Stahl, aus einer Eisen-Nickel-Legierung oder aus einer Eisen-Nickel-Kobalt-Legierung besteht.
7. Evakuierte Hülle nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß sie zwischen dem Körper (2) und dem Ring (11), auf welchem das Fenster verschweißt ist, einen Zwischenring (12) umfaßt.
8. Evakuierte Hülle nach Anspruch 7, dadurch gekennzeichnet, daß der Zwischenring (12) aus einer Eisenlegierung wie einer Eisen-Nickel-Legierung oder einer Eisen-Nickel-Kobalt-Legierung, besteht.
9. Verfahren zur Herstellung einer evakuierten Hülle für Strahlungs-Bildverstärkerröhre oder ähnliche Elektronenröhre nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß das Ende (10") der Schürze (10) aus Aluminium oder aus einer Aluminiumlegierung und der Ring (11) aus Eisen oder aus einer Eisenlegierung ineinandergesteckt werden, und daß das Ende der Schürze auf den Ring mittels einer Schweißung durch magnetische Induktion verschlossen wird, bei der das Ende der Schürze gegen den Ring angelegt und mit ihm verbunden wird.
10. Verfahren nach Anspruch 9, dadurch gekennzeichnet, daß das Schweißen durch magnetische Induktion mittels einer Induktionsspule (L) verwirklicht wird welche das Ende der Schürze umschließt und in welcher sich eine zu einem Schwingkreis geschaltete Kapazität (C) entlädt.
11. Verfahren nach Anspruch 10, dadurch gekennzeichnet, daß die Eigenschwingungsfrequenz des Schwingkreises so eingestellt wird, daß eine der Dicke des Schürzenendes entsprechende Skin-Dicke erhalten wird.
EP85401037A 1984-05-30 1985-05-28 Vakuumkolben für Strahlungsbildverstärker und Verfahren zu seiner Herstellung Expired EP0165851B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8408500A FR2565407B1 (fr) 1984-05-30 1984-05-30 Enveloppe sous vide pour tube intensificateur d'images de rayonnement et procede de fabrication d'une telle enveloppe
FR8408500 1984-05-30

Publications (2)

Publication Number Publication Date
EP0165851A1 EP0165851A1 (de) 1985-12-27
EP0165851B1 true EP0165851B1 (de) 1989-01-04

Family

ID=9304551

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85401037A Expired EP0165851B1 (de) 1984-05-30 1985-05-28 Vakuumkolben für Strahlungsbildverstärker und Verfahren zu seiner Herstellung

Country Status (5)

Country Link
US (1) US4763042A (de)
EP (1) EP0165851B1 (de)
JP (1) JPS6158149A (de)
DE (1) DE3567317D1 (de)
FR (1) FR2565407B1 (de)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2594595B1 (fr) * 1986-02-18 1988-05-13 Thomson Csf Enveloppe sous vide pour tube intensificateur d'images radiologiques et procede de fabrication d'une telle enveloppe
NL8602212A (nl) * 1986-09-02 1988-04-05 Philips Nv Modulair opgebouwde roentgenbeeldversterkerbuis.
JPH061888Y2 (ja) * 1987-08-05 1994-01-19 株式会社東海理化電機製作所 オ−トマチックシ−トベルト装置
US5235239A (en) * 1990-04-17 1993-08-10 Science Research Laboratory, Inc. Window construction for a particle accelerator
DE19734915C1 (de) * 1997-08-12 1999-03-04 Siemens Ag Röntgenbildverstärker mit Aluminiumeingangsfenster sowie Verfahren zu seiner Herstellung
US6118852A (en) * 1998-07-02 2000-09-12 General Electric Company Aluminum x-ray transmissive window for an x-ray tube vacuum vessel

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB207590A (en) * 1922-08-25 1923-11-26 Ernest Yeoman Robinson Improvements in seals, joints and the like of vacuum containers
US2708250A (en) * 1952-06-05 1955-05-10 Farnsworth Res Corp Tube assembly
US3335310A (en) * 1964-06-12 1967-08-08 Gen Electric Electron image tube fiber optical face plate seal structure
FR1579461A (de) * 1965-10-14 1969-08-29
US3419741A (en) * 1966-04-19 1968-12-31 Thomas Electronics Inc Vacuum seal for a thin beryllium x-ray window
US3603759A (en) * 1970-01-14 1971-09-07 Ind Magnetics Inc Welding and forming method
DE2151079A1 (de) * 1971-10-13 1973-04-19 Siemens Ag Strahlendurchtrittsfenster
US4045699A (en) * 1973-06-19 1977-08-30 Siemens Aktiengesellschaft Use of light-metal panes as x-ray transmissive windows
US4119234A (en) * 1975-03-27 1978-10-10 Siemens Aktiengesellschaft Vacuum-tight windows for passage of X-rays or similar penetrating radiation
DE2605376C3 (de) * 1976-02-11 1979-01-11 Siemens Ag, 1000 Berlin Und 8000 Muenchen Abdichtung für ein Röntgenstrahlendurchgangsfenster und Verfahren zur Herstellung der Abdichtung
JPS5836817B2 (ja) * 1976-05-17 1983-08-11 株式会社東芝 Ｘ線けい光増倍管
JPS5815902B2 (ja) * 1979-01-24 1983-03-28 株式会社東芝 Ｘ線けい光増倍管
JPS5620264U (de) * 1979-07-24 1981-02-23
US4423351A (en) * 1980-05-06 1983-12-27 Tokyo Shibaura Denki Kabushiki Kaisha Vacuum container of radiation image multiplier tube and method of manufacturing the same
JPS56167246A (en) * 1980-05-26 1981-12-22 Toshiba Corp X-ray image intensifier and its manufacturing method
JPS5773853U (de) * 1980-10-22 1982-05-07

Also Published As

Publication number Publication date
JPS6158149A (ja) 1986-03-25
FR2565407A1 (fr) 1985-12-06
US4763042A (en) 1988-08-09
FR2565407B1 (fr) 1987-07-24
DE3567317D1 (en) 1989-02-09
EP0165851A1 (de) 1985-12-27

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