EP0637053B1 - Elektronenröhre - Google Patents
Elektronenröhre Download PDFInfo
- 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
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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)
Description
Claims (4)
- Elektronenröhre, insbesondere Röntgenröhre, mit einer Kathodenanordnung (3,4), die einen Elektronenemitter (41) umfaßt, der mit Stützstiften (43) verbunden ist, die ihrerseits über je ein Befestigungselement (44) mit der Kathodenanordnung verbunden sind,
wobei die Befestigungselemente (44) in einem ersten Bereich (441) mit der Kathodenanordnung und in einem zweiten, im Abstand vom ersten befindlichen Bereich (442) mit dem zugehörigen Stützstift (43) verbunden sind, und daß die Befestigungselemente (44) die Form einer Hülse haben, in die der Stützstift eingeführt ist, dadurch gekennzeichnet, daß die Hülsenwand zwischen dem ersten und dem zweiten Bereich einen durch eine Ausbuchtung gebildeten Verformungsbereich (443) aufweist, durch dessen Verformung die Position des Elektronenemitters in bezug auf die Kathodenstruktur justierbar ist. - Elektronenröhre nach Anspruch 1,
dadurch gekennzeichnet, daß der Innendurchmesser der Hülse im ersten Bereich (441) größer ist als im zweiten Bereich (442). - Elektronenröhre nach Anspruch 1,
dadurch gekennzeichnet, daß die Kathodenanordnung einen Grundkörper (48) aus Metall umfaßt und daß wenigstens eines der Befestigungselemente (44) über einen Keramikkörper (45) mit dem Grundkörper (48) verbunden ist. - Elektronenröhre nach Anspruch 3,
dadurch gekennzeichnet, daß am Keramikkörper (45) eine Anschlußlasche (47) angebracht ist, die in elektrischem Kontakt mit dem Befestigungselement (44) steht.
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 (de) | 1995-02-01 |
EP0637053A3 EP0637053A3 (de) | 1995-11-22 |
EP0637053B1 true EP0637053B1 (de) | 1999-02-10 |
Family
ID=6494077
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94202160A Expired - Lifetime EP0637053B1 (de) | 1993-07-30 | 1994-07-25 | Elektronenröhre |
Country Status (4)
Country | Link |
---|---|
US (1) | US5526396A (de) |
EP (1) | EP0637053B1 (de) |
JP (1) | JP3737530B2 (de) |
DE (2) | DE4325609A1 (de) |
Families Citing this family (14)
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 |
EP1611591B1 (de) * | 2003-03-03 | 2012-06-06 | Koninklijke Philips Electronics N.V. | Röntgenröhrenkathodenbaugruppe und grenzflächenreaktionsverbindeprozess |
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 |
JP5543483B2 (ja) * | 2008-12-08 | 2014-07-09 | コーニンクレッカ フィリップス エヌ ヴェ | 電子源及びその陰極カップ |
CN104488063B (zh) * | 2012-05-22 | 2017-06-09 | 皇家飞利浦有限公司 | 阴极细丝组装 |
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 |
CN108352282B (zh) * | 2015-11-13 | 2020-05-22 | 皇家飞利浦有限公司 | 用于组装用于x射线管的阴极的方法 |
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL35143C (de) * | 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 |
-
1993
- 1993-07-30 DE DE4325609A patent/DE4325609A1/de not_active Withdrawn
-
1994
- 1994-07-08 US US08/267,210 patent/US5526396A/en not_active Expired - Lifetime
- 1994-07-25 EP EP94202160A patent/EP0637053B1/de not_active Expired - Lifetime
- 1994-07-25 DE DE59407791T patent/DE59407791D1/de not_active Expired - Fee Related
- 1994-07-26 JP JP17450194A patent/JP3737530B2/ja not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JPH07176281A (ja) | 1995-07-14 |
DE59407791D1 (de) | 1999-03-25 |
EP0637053A2 (de) | 1995-02-01 |
JP3737530B2 (ja) | 2006-01-18 |
DE4325609A1 (de) | 1995-02-02 |
US5526396A (en) | 1996-06-11 |
EP0637053A3 (de) | 1995-11-22 |
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