EP0191664B1 - Enveloppe sous vide pour tube intensificateur d'images radiologiques - Google Patents

Enveloppe sous vide pour tube intensificateur d'images radiologiques Download PDF

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Publication number
EP0191664B1
EP0191664B1 EP86400055A EP86400055A EP0191664B1 EP 0191664 B1 EP0191664 B1 EP 0191664B1 EP 86400055 A EP86400055 A EP 86400055A EP 86400055 A EP86400055 A EP 86400055A EP 0191664 B1 EP0191664 B1 EP 0191664B1
Authority
EP
European Patent Office
Prior art keywords
aluminum
brazed
central member
window
alloy
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
EP86400055A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0191664A1 (fr
Inventor
Gilbert Colomb
Maurice Verat
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 EP0191664A1 publication Critical patent/EP0191664A1/fr
Application granted granted Critical
Publication of EP0191664B1 publication Critical patent/EP0191664B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • 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 a vacuum envelope for an X-ray image intensifier tube.
  • Vacuum envelopes for radiological image intensifier tubes essentially comprise a central body of revolution, the ends of which are terminated by an entry window intended for the passage of the radiation to be intensified and by an exit window for visible radiation.
  • the tube inlet screen being convex for the purposes of electronic optics, if a concave window is used, the tube must be lengthened by an amount equal to the arrow in the inlet window. However, this arrow is all the more important as the field of entry of the IIR is larger.
  • the tube entry plane moves away from the entry screen. Due to the conical projection from the focal point of the X-ray tube, the actual input field of the tube, measured in the input plane, is reduced compared to the useful field of the input screen.
  • the sealing between the window and the central body can be carried out by thermo-compression welding as described for example in French patent FR-A 2 482 366.
  • the contact surfaces must be flat, thereby excluding the type of cylinder-on-cylinder geometry.
  • the convex aluminum or aluminum alloy window has an annular peripheral flange and the assembly between the window and the body requires either that the body has an annular flange perpendicular to the axis of the tube, or use of an L-shaped or S-shaped connection ring
  • Another solution of the prior art consists in using a convex window having a copper layer plated on an aluminum layer in which the copper layer is removed in the part subjected to radiation and the aluminum layer is removed on the periphery of a flat surrounding the convex cap, reserving a localized overlap of the two layers.
  • the copper is then welded by electric arc welding along a lip formed on the metallic central body which can be made of stainless steel.
  • the present invention aims to provide a new vacuum envelope structure for an X-ray image intensifier tube, comprising an aluminum window, easy and quick to produce and easily industrializable.
  • the present invention relates to a vacuum envelope for an X-ray image intensifier tube according to claim 1 and a method of manufacturing such an envelope according to claim 9.
  • Figure 1 is a longitudinal sectional view of a radiological image intensifier tube comprising a vacuum envelope according to an embodiment of the invention.
  • the part 1 designates a part of the central body of revolution. This part consists of a glass cylinder ending in an exit window also made of glass.
  • the glass cylinder is welded to an intermediate ring 2.
  • This intermediate ring is made of iron or an iron alloy, preferably an 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 cylinder in particular, when the rest of the central body of revolution 3 is made of stainless steel.
  • the parts 2 and 3 may constitute only one piece when they are made of the same material.
  • the main elements constituting the radiological image intensifier tube such as the scintillator and the photocathode, which have the reference 4, the acceleration and focusing electrodes 5, have been shown diagrammatically inside the envelope. the output screen 8, and the last electrode or anode 9.
  • the entry window 10 is made of an aluminum and magnesium alloy of the 5000 series, such as for example 5086 or AG 4 MC.
  • the series in question is defined, like many others, by American standards well known to specialists. These alloys are rigid enough to withstand the mechanical stresses due to the difference in pressures existing between the inside and the outside of the tube.
  • AG 4 MC is the most efficient alloy from a mechanical point of view for this application.
  • the window 10 of aluminum and magnesium alloy it is not possible to directly solder the window 10 of aluminum and magnesium alloy to the ferrous alloy of the central body of revolution because the melting range of the window, for example in the case where it is made of AG 4 MC, extends from 580 to 640 °, i.e. in the brazing interval of the AI - Si eutectic at 89% which allows the brazing between aluminum and its alloys and ferrous alloys .
  • the entry window 10 therefore fits into an aluminum part 11 of the 1000 series, such as for example the 1050 A or A5, as can be seen in FIG. 1.
  • the window 10 and the part 11 are welded, for example by TIG (Tungsten lneri Gaz) welding in alternating current and under a helium atmosphere, to obtain a good vacuum seal.
  • TIG Tungsten lneri Gaz
  • FIG. 1 it can be seen that a groove is provided in the part 11 to allow the embedding of the part 10.
  • the part 11 which is of aluminum of type A s par. example, can be brazed to a piece 12 of ferrous alloy which is part of the central body of the tube. It is an aluminum-silicon eutectic solder, around 585 ° C or an aluminum-silicon magnesium eutectic solder. This solder makes it possible to make the parts 11 and 12 integral in a vacuum-tight manner.
  • the window 10 is then fitted into the window and welded to the part 11. Then the window 10 and the parts 11 and 12 are assembled to the rest of the central body of ferrous alloy, for example by Argon-Arc welding.
  • a method of manufacturing a vacuum envelope according to the invention therefore consists in assembling a part 11 of aluminum of type A s to a part 12 of ferrous alloy.
  • This process is simple, fast and easily industrializable.
  • FIGS 2 to 5 show various alternative embodiments of the vacuum envelope according to the invention.
  • FIG. 2 shows in more detail the embodiment of FIG. 1.
  • the piece 11 of aluminum of the As type is brazed to a piece 12 of ferrous alloy, of substantially cylindrical shape, and terminated by a circular crown 13.
  • the circular crown 13 is brazed to the piece 11, which has substantially the shape of a circular crown.
  • This brazing consists in melting a "joint" 14 of brazing, at a suitable temperature, by all known means, for example in an oven, by high frequency losses in the parts to be assembled, by electronic bombardment ...
  • This fusion can have place under any controlled, reducing or neutral atmosphere, thanks to the addition of a flux.
  • the two surfaces to come into contact receive a layer of aluminum solder.
  • the assembly is placed on a metal mandrel surmounted by a support plate made of asbestos cement and preheating to 180 ° C. is carried out.
  • a 0.6 mm thick ferro-magnetic steel disc is deposited on the assembly, which is commonly referred to by the term "susceptor".
  • the susceptor is heated by induction and transmits heat by conduction.
  • the brazing operation takes place while the assembly is tightened under high pressure.
  • the duration of this pressurization and that of the heating of the susceptor are determined according to the dimensions of the parts. On average, the duration of pressurization is more than double the duration of heating of the susceptor.
  • the temperature is around 580 ° C.
  • the susceptor is removed and the two brazed parts are immersed in water at room temperature, which makes it possible to remove a large part of the flux by detachment. .
  • the rest of the flux is removed by mechanical action and by chemical treatment.
  • part 12 When brazed, the pieces undergo various expansions. To give them more flexibility during the brazing operation, grooves or recesses can be made on the parts to be brazed. Frets can be used to compensate for the differences in expansion between the two brazed materials. For example, a part made of the same material as part 12 can be placed against the part 11, on the side where it is not in contact with the part 12.
  • FIGS 3, 4 and 5 show various variants of the envelope according to the invention.
  • the part 11 has a substantially conical shape, with a slight slope.
  • the central body ends in a part 12, of substantially conical shape, with a slight slope.
  • the solder 14 is distributed between the two surfaces facing the parts 11 and 12, which are substantially conical, and have a slight slope.
  • the part 11 has substantially the shape of a circular crown and the central body ends in a cylindrical part 12, the end of which is brazed to the part 11.
  • FIG. 5 represents another variant of the envelope according to the invention in which said part 11 has substantially the shape of a circular crown.
  • the central body ends in a substantially cylindrical part 12 to which another substantially cylindrical part 15 is welded, ending in a circular ring 16 brazed to said part 11.
  • This variant allows brazing to be carried out without modifying the parts usually used to make the intensifiers.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)
EP86400055A 1985-01-15 1986-01-10 Enveloppe sous vide pour tube intensificateur d'images radiologiques Expired - Lifetime EP0191664B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8500524A FR2576146B1 (fr) 1985-01-15 1985-01-15 Enveloppe sous vide pour tube intensificateur d'images radiologiques
FR8500524 1985-01-15

Publications (2)

Publication Number Publication Date
EP0191664A1 EP0191664A1 (fr) 1986-08-20
EP0191664B1 true EP0191664B1 (fr) 1990-06-20

Family

ID=9315295

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86400055A Expired - Lifetime EP0191664B1 (fr) 1985-01-15 1986-01-10 Enveloppe sous vide pour tube intensificateur d'images radiologiques

Country Status (5)

Country Link
US (1) US4721884A (ja)
EP (1) EP0191664B1 (ja)
JP (1) JPS61168848A (ja)
DE (1) DE3672173D1 (ja)
FR (1) FR2576146B1 (ja)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69301487T2 (de) * 1992-03-31 1996-08-08 Sumitomo Light Metal Ind Röntgenbildverstärker
US5594301A (en) * 1994-06-30 1997-01-14 Hamamatsu Photonics K.K. Electron tube including aluminum seal ring
US5705885A (en) * 1994-11-25 1998-01-06 Kabushiki Kaisha Toshiba Brazing structure for X-ray image intensifier
DE19734915C1 (de) * 1997-08-12 1999-03-04 Siemens Ag Röntgenbildverstärker mit Aluminiumeingangsfenster sowie Verfahren zu seiner Herstellung
JP3756681B2 (ja) * 1997-11-21 2006-03-15 東芝電子エンジニアリング株式会社 放射線イメージ管およびその製造方法

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1339039A (fr) * 1962-09-25 1963-10-04 Thomson Houston Comp Francaise Méthode et appareil de jonction et de brasure dans le vide et en compression
JPS5135942A (en) * 1974-09-24 1976-03-26 Hitachi Ltd Koryuerebeeta no seigyosochi
JPS5261782A (en) * 1976-04-07 1977-05-21 Chugoku Electric Power Line spacer for salttproofing
DE2619293C3 (de) * 1976-04-30 1979-02-01 Siemens Ag, 1000 Berlin Und 8000 Muenchen Strahlendurchgangsfenster, insbesondere für Röntgenbildverstärker
NL177160C (nl) * 1977-10-24 1985-08-01 Philips Nv Roentgenbeeldversterkerbuis.
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
JPS59158059A (ja) * 1983-02-28 1984-09-07 Shimadzu Corp Ｘ線イメ−ジ管

Also Published As

Publication number Publication date
FR2576146B1 (fr) 1987-02-06
EP0191664A1 (fr) 1986-08-20
DE3672173D1 (de) 1990-07-26
JPS61168848A (ja) 1986-07-30
FR2576146A1 (fr) 1986-07-18
US4721884A (en) 1988-01-26

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