EP0637053B1 - Tube à électrons - Google Patents

Tube à électrons Download PDF

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Publication number
EP0637053B1
EP0637053B1 EP94202160A EP94202160A EP0637053B1 EP 0637053 B1 EP0637053 B1 EP 0637053B1 EP 94202160 A EP94202160 A EP 94202160A EP 94202160 A EP94202160 A EP 94202160A EP 0637053 B1 EP0637053 B1 EP 0637053B1
Authority
EP
European Patent Office
Prior art keywords
filament
cathode
region
electron emitter
electron
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
EP94202160A
Other languages
German (de)
English (en)
Other versions
EP0637053A2 (fr
EP0637053A3 (fr
Inventor
Heinz-Jürgen c/o Philips Patentverw. GmbH Jacob
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 Corporate Intellectual Property GmbH
Philips Patentverwaltung GmbH
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 Corporate Intellectual Property GmbH, Philips Patentverwaltung GmbH, Koninklijke Philips Electronics NV filed Critical Philips Corporate Intellectual Property GmbH
Publication of EP0637053A2 publication Critical patent/EP0637053A2/fr
Publication of EP0637053A3 publication Critical patent/EP0637053A3/fr
Application granted granted Critical
Publication of EP0637053B1 publication Critical patent/EP0637053B1/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
    • H01J35/00—X-ray tubes
    • H01J35/02—Details
    • H01J35/04—Electrodes ; Mutual position thereof; Constructional adaptations therefor
    • H01J35/06—Cathodes
    • H01J35/064—Details of the emitter, e.g. material or structure

Definitions

  • the invention relates to an electron tube, in particular an X-ray tube, with a cathode arrangement, which comprises an electron emitter, which with Support pins is connected, which in turn each with a fastener are connected to the cathode arrangement.
  • Such an electron tube namely an X-ray tube, is from the JP-A 63-105427 known.
  • the electron emitter - a directly heated one Filament - first at both ends with a support pin connected.
  • the support pins are each in a hollow cylindrical fastener introduced, the two fasteners in a ceramic body are let in.
  • the unit formed in this way is by means of a positioning device in a defined position with respect to the cathode head brought and fixed in this position.
  • the electron emitter must be precisely defined Take up position with respect to the focusing electrode - even after the filament has been subjected to a heat treatment. At this However, heat treatment can change the position of the filament, and therefore it is necessary after heat treatment, the location of the Adjust electron emitter with respect to the focusing electrode. This Adjustment work requires manual skill and is lengthy, especially if the heat treatment and adjustment are repeated have to.
  • EP-A 273 162 To simplify the adjustment work, it is known from EP-A 273 162 to use a two-part cathode head.
  • the electron emitter or the support pins supporting it are initially in one cathode part mounted in which the filament is easily accessible from the outside. Only after the heat treatment and the adjustment have been carried out the two cathode parts connected together.
  • the adjustment work either the electron emitter or at least one of the support pins supporting it bent at its upper end until the Electron emitter has reached the desired position.
  • the object of the present invention is to provide an electron tube mentioned type so that the electron emitter can be adjusted quickly can.
  • This object is achieved by the measures specified in claim 1 solved.
  • regions that are spatially separate from one another are therefore one sleeve-shaped fastener on the one hand with a support pin and on the other hand connected to the rest of the cathode assembly, between these areas there is a deformation area formed by a bulge.
  • the electron emitter can be adjusted; i.e. the Fastening element also functions as an adjusting element. If on the Bulge acts a force perpendicular to the sleeve, then the Diameter of the bulge, whereby the associated support pin in the is moving in one direction. By a parallel to the sleeve direction on the Bulge acting force, the bulge is deformed so that the Support pin moved in the opposite direction.
  • the relative position changes due to the deformation of the deformation region between the (first) area in which the fastener with the cathode is connected and the (second) area in which the support pin with the Fastener is connected.
  • the location of the electron emitter can therefore can be adjusted by deforming the deformation area without the Electron emitter (filament) or the support pins must be bent. This allows the use of already recrystallized filaments by mechanical Tensions are free and therefore due to the heating in the operating state not warp, which are so brittle, however, that they are in the process of adjustment, of the forces would be exerted on the filament, would break off.
  • a preferred development of the invention provides that the inner diameter the sleeve in the first area is larger than that of the outer diameter of the support pins adjusted inner diameter of the sleeve in the second area. This makes it possible by bending the fastening element, the position of the associated support pin or of the associated electron emitter without changing the support pin itself or to bend the electron emitter (filament).
  • the Cathode arrangement can then be designed so that the deformation areas on the accessible from the electron emitter side of the cathode, what that Adjustment much easier. The same effect could be achieved if support pins are used. whose outer diameter in the (second) Area where they are connected to the sleeve. is larger than the diameter the rest of the support pin.
  • the cathode arrangement comprises a metal cathode body and that at least one of the Fastening elements connected to the base body via a ceramic body is.
  • the ceramic body prevents it an electrical short circuit of the filament.
  • the rotary anode X-ray tube shown in Fig. 1 has a tube bulb 1 made of glass, which encloses a vacuum space in which a Rotating anode arrangement 2 and a cathode structure 3 are located.
  • the Cathode structure comprises a cathode head 4, in which - in Fig. 1 only schematically indicated - an electron emitter, preferably in the form of a directly heated helical filament. The X-rays is thus emitted from the heating filament by heating it Generates electrons.
  • Fig. 2 shows a cross section extending in the longitudinal direction of the filament through the cathode head 4.
  • the cathode head 4 comprises a base body 48 made of metal, which has a trough-shaped recess 40 on its upper side has, which opens into a slot 42 in which a filament 41 is located.
  • the two free ones, roughly perpendicular to the course of the filament kinking filament legs are each connected to a support pin 43.
  • the two support pins 43 are made of molybdenum and have a thickness of 1.5 mm; they dip into a fastener 44 and are on it End connected with this.
  • fasteners 44 are made with the body 48 connected. But while the right connector 44 directly is connected to the base body 48, the left fastening element 44th connected to a ceramic body 45 which is connected via a fastening ring 46 made of metal is connected to the base body 48.
  • a metal with a suitable coefficient of thermal expansion for example an alloy of iron, nickel and Cobalt (Vacon)
  • fasteners 44 are made with the body 48 connected. But while the right connector 44 directly is connected to the base body 48, the left fastening element 44th connected to a ceramic body 45 which is connected via a fastening ring 46 made of metal is connected to the base body 48.
  • the appearance and shape of the parts 44 to 46 result in particular from FIG. 3a.
  • the ceramic body 45 then has the shape of a hollow cylinder. This in this ceramic body 45 immersed upper end of the fastener 44 is connected to the metallized inner surface of the ceramic body 45 by a Soldering connected.
  • the fastening ring 46 which surrounds the ceramic body 45, is also on the outer perimeter in this area metallized ceramic body 45 soldered.
  • a connecting strap 47, the after assembly with a line for supplying a heating current for the filament is connected to the likewise metallized lower end face of the ceramic body 45 soldered so that the connecting tab 47 with the fastener 44 has electrical contact - but not with that Fastening ring 46.
  • the fastening element is approximately 12.5 mm long 44 the shape of a sleeve or a hollow cylinder with a wall thickness of 0.25 mm, its inner diameter in an upper, about 7 mm long part (441) is 2.0 mm and in a lower, about 3 mm long Part 442 only 1.5 mm.
  • the area between these parts contains a deformable, bulge 443 rotationally symmetrical to the longitudinal axis, in which - at constant wall thickness - the outside diameter gradually increases to 4 mm increases.
  • the support pin 43 dips from above into the sleeve and is with the Sleeve connected at its lower part 442.
  • the fastener 44 or that of the fastening element and the components 45, 47 existing unit inserted into the one-piece body 48, by means of a suitable teaching relative to the body and aligned to suitable Connected to it, e.g. by spot welding.
  • the fasteners 44 then have a defined position with respect to the base body.
  • the filament 41 is spot welded to the two Support pins 43 connected.
  • a filament is preferably used here, by a previous heat treatment in the area of his both side legs is recrystallized.
  • the use of such recrystallized filament has the advantage that the filament at a subsequent heat treatment and later operation of the X-ray tube hardly warped and that the heat treatment the - when used unrecrystallized filaments - the multiple change between heating and Adjustment steps required, can be shortened considerably.
  • an already recrystallized filament is so brittle that it breaks when it is bent when adjusting or when bending a support pin Forces are introduced into it; Such filaments can therefore usual adjustment procedures are not used.
  • the support pins 43 are then inserted into the fastening elements 44 and by means of a suitable teaching in a defined position with regard to brought the cathode head 48 and fixed in this position by in Area 442 connected to the fastener 44 by spot welding become. Then the filament has essentially reached the target position.
  • the filament is precisely adjusted by deforming the deformable area formed by the bulge 443.
  • the filament can be too high inside the cathode head on one or both sides or be too low. It can be asymmetrical with respect to the slot 42, or it can be twisted so that its individual turns on one curved line.
  • the position can be adjusted by by means of a tool provided with clamping jaws 5 (FIG. 3b) vertically to the longitudinal axis of the fastener 44, a pressure on the bulge 443 is exercised so that it is somewhat compressed. Because the fastener with its upper region 441 fixed to the base body 48 is connected, the lower part 442 is displaced by this deformation the fastener down and with it the support pin attached 43 or the associated end of the filament 41.
  • the support pins can be rotated about their longitudinal axis be that at the lower portion 442 of the fastener by means of a Pliers a torsional moment is exerted. This allows the filament align straight.
  • the described adjustment processes can be done under the immediate visual Control of the operator and using gauges, which define the target position of the filament. But it is also possible that Position the filament within the cathode head with a suitable one Record camera and the operating position after suitable image processing to display on a monitor what the adjustment process even further simplified and shortened.
  • Electron emitter is formed by a filament to be heated directly. But it is also possible to use other electron emitters in this way adjust, for example indirectly heated electron emitters.

Landscapes

  • Electron Sources, Ion Sources (AREA)
  • Electrodes For Cathode-Ray Tubes (AREA)

Claims (4)

  1. Tube à électrons, en particulier tube à rayons X avec un agencement de cathode (3,4) qui comprend un émetteur d'électrons (41) fixé avec des broches de support (43) qui, pour leur part, sont fixées respectivement par l'intermédiaire d'un élément de fixation (44) chacune à l'agencement de cathode, les éléments de fixation (44) étant fixés dans une première zone (441) à l'agencement de cathode et dans une deuxième zone (442) disposée à un intervalle de la première avec la broche de support correspondante (43) et les éléments de fixation (44) ayant la forme d'une douille dans laquelle la broche de support est introduite, caractérisé en ce que la paroi de la douille entre les première et deuxième zones présente une zone de déformation (443) formée par une saillie, par la déformation de laquelle la position de l'émetteur de l'électron peut être ajustée par rapport à la structure de la cathode.
  2. Tube à électrons selon la revendication 1, caractérisé en ce que le diamètre interne de la douille dans la première zone (441) est supérieur à celui de la deuxième zone (442).
  3. Tube à électrons selon la revendication 1, caractérisé en ce que l'agencement de cathode comprend un corps de base (48) en métal et qu'au moins un des éléments de fixation (44) est relié par l'intermédiaire d'un corps en céramique (45) avec le corps de base (48).
  4. Tube à électrons selon la revendication 3, caractérisé en ce qu'une patte de raccordement (47) qui est en contact électrique avec l'élément de fixation (44) est appliquée sur le corps en céramique (45).
EP94202160A 1993-07-30 1994-07-25 Tube à électrons Expired - Lifetime EP0637053B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4325609 1993-07-30
DE4325609A DE4325609A1 (de) 1993-07-30 1993-07-30 Elektronenröhre

Publications (3)

Publication Number Publication Date
EP0637053A2 EP0637053A2 (fr) 1995-02-01
EP0637053A3 EP0637053A3 (fr) 1995-11-22
EP0637053B1 true EP0637053B1 (fr) 1999-02-10

Family

ID=6494077

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94202160A Expired - Lifetime EP0637053B1 (fr) 1993-07-30 1994-07-25 Tube à électrons

Country Status (4)

Country Link
US (1) US5526396A (fr)
EP (1) EP0637053B1 (fr)
JP (1) JP3737530B2 (fr)
DE (2) DE4325609A1 (fr)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5920605A (en) * 1996-10-10 1999-07-06 General Electric Company Cathode cup assembly for an x-ray tube
JP4334639B2 (ja) * 1998-07-30 2009-09-30 浜松ホトニクス株式会社 Ｘ線管
US6134300A (en) * 1998-11-05 2000-10-17 The Regents Of The University Of California Miniature x-ray source
US6373922B1 (en) 2000-05-18 2002-04-16 General Electric Company Method and apparatus for filament set height adjustment of a cathode cup assembly
WO2004079762A2 (fr) * 2003-03-03 2004-09-16 Koninklijke Philips Electronics N.V. Ensemble cathode pour tube a rayons x et processus d'assemblage par reaction au niveau de l'interface
US7020244B1 (en) * 2004-12-17 2006-03-28 General Electric Company Method and design for electrical stress mitigation in high voltage insulators in X-ray tubes
US7661445B2 (en) * 2005-12-19 2010-02-16 Varian Medical Systems, Inc. Shielded cathode assembly
EP2377141B1 (fr) * 2008-12-08 2014-07-16 Philips Intellectual Property & Standards GmbH Source d'électrons et sa coupelle de cathode
BR112014028913A2 (pt) * 2012-05-22 2017-06-27 Koninklijke Philips Nv cátodo para um tubo de raios x, tubo de raios x, sistema para imagens de raios x, e método para a montagem de um cátodo para um tubo de raios x
RU2530533C1 (ru) * 2013-02-21 2014-10-10 Иван Николаевич Столяров Катод рентгеновской трубки
DE102014209389B4 (de) 2014-05-17 2019-10-17 Incoatec Gmbh Justageeinrichtung für einen Elektronenemitter einer Elektronenröhre
JP2016173926A (ja) * 2015-03-17 2016-09-29 東芝電子管デバイス株式会社 Ｘ線管
US11232926B2 (en) * 2015-11-13 2022-01-25 Koninklijke Philips N.V. Cathode for an X-ray tube
JP7197245B2 (ja) * 2017-01-12 2022-12-27 キヤノン電子管デバイス株式会社 Ｘ線管及びｘ線管の製造方法

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL35143C (fr) * 1931-06-12
US2123607A (en) * 1931-08-19 1938-07-12 James F Lee Variable focus x-ray tube
US2130020A (en) * 1934-03-13 1938-09-13 Harry B Mceuen Cathode filament control for x-ray tubes
GB490377A (en) * 1937-02-12 1938-08-12 Standard Telephones Cables Ltd Improvements in or relating to x-ray tubes
US3631289A (en) * 1969-05-23 1971-12-28 Picker Corp X-ray filament with balanced emission
JPS63105427A (ja) * 1986-10-20 1988-05-10 Toshiba Corp Ｘ線管用陰極構体の製造方法
US4825123A (en) * 1986-12-31 1989-04-25 General Electric Company Two-piece cathode cup
US5077777A (en) * 1990-07-02 1991-12-31 Micro Focus Imaging Corp. Microfocus X-ray tube

Also Published As

Publication number Publication date
EP0637053A2 (fr) 1995-02-01
JP3737530B2 (ja) 2006-01-18
JPH07176281A (ja) 1995-07-14
DE4325609A1 (de) 1995-02-02
US5526396A (en) 1996-06-11
DE59407791D1 (de) 1999-03-25
EP0637053A3 (fr) 1995-11-22

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