EP0220396A1 - Indirectly heated dispenser-type cathode for electric discharge vessels - Google Patents

Indirectly heated dispenser-type cathode for electric discharge vessels Download PDF

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Publication number
EP0220396A1
EP0220396A1 EP86110820A EP86110820A EP0220396A1 EP 0220396 A1 EP0220396 A1 EP 0220396A1 EP 86110820 A EP86110820 A EP 86110820A EP 86110820 A EP86110820 A EP 86110820A EP 0220396 A1 EP0220396 A1 EP 0220396A1
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EP
European Patent Office
Prior art keywords
cathode
heater
sleeve
indirectly heated
cartridge
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.)
Granted
Application number
EP86110820A
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German (de)
French (fr)
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EP0220396B1 (en
Inventor
Erwin Dr. rer. nat. Hübner
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Siemens AG
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Siemens AG
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Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP0220396A1 publication Critical patent/EP0220396A1/en
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Publication of EP0220396B1 publication Critical patent/EP0220396B1/en
Expired legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
    • H01J1/02—Main electrodes
    • H01J1/13—Solid thermionic cathodes
    • H01J1/20—Cathodes heated indirectly by an electric current; Cathodes heated by electron or ion bombardment

Definitions

  • the invention relates to a supply cathode according to the preamble of patent claim 1.
  • Cathodes for electrical discharge vessels in which emission substances from an emission substance supply through fine openings of a porous emission substance carrier covering them, made of in particular porous sintered high-melting metal, such as e.g. Tungsten, migrate to the cathode surface and in which the supply of barium in operation consists of barium oxide, are known, for example, from DE-PS 12 17 503.
  • Cathodes of the type described are largely used today, among other things, in traveling wave tubes and disc tubes and work to full satisfaction.
  • one end of the heater is often soldered to the cathode cartridge at the same time as the cathode sleeve for heat-economic reasons.
  • the cathode sleeve has a notch where the cartridge, heater and sleeve are soldered at the same time.
  • the object of the present invention is to avoid wire embrittlement in a supply cathode and a heater breakage resulting therefrom under mechanical loads (thermal movements).
  • the main advantage of the proposed supply cathode is that the measure according to the invention, instead of providing a notch for providing a window in the cathode sleeve, which is preferably introduced about 1.5 mm below the edge of the cathode sleeve, ensures that the capillary action between the cathode sleeve and cathode cartridge, seen over the circumference, is no longer disturbed at any point and the solder is thus preferably held in this zone. It is therefore not possible to pull the solder up to the kink of the heating coil due to capillary forces between the cathode cartridge and the adjacent heater end, since there is no fear of excess solder at this point. The solder flow and heater bend can also be checked through the window.
  • the known supply cathode shown in FIG. 1 essentially consists of an emission carrier disk 8, which at the end covers a cathode cartridge 3 attached to a fastening ring 6 made of molybdenum.
  • the cathode cartridge 3 has an outwardly widened gradation on the end face and contains the supply of emissions.
  • the cathode cartridge 3 is surrounded by a helical heater 1, which is preferably operated with direct current.
  • the cathode cartridge 3 is arranged coaxially in a cathode sleeve 2, which is hollow-cylindrical.
  • the cathode sleeve 2 On the face side, the cathode sleeve 2 is provided with a notch 5, in the area of which the end of the heater 1 which has a kink 4 is soldered to the gradation of the cathode cartridge 3 and the cathode sleeve 2.
  • the cathode sleeve 2 is simultaneously fastened to the fastening ring 6 via the solder layer 7.
  • the cathode cartridge 3 is extended upwards towards the emission carrier plate 8 by a gradation and preferably contains barium oxide as the emission agent supply.
  • the cathode cartridge 3 is surrounded by a helical heater 1, which is preferably heated with direct current.
  • the cathode cartridge 3 is arranged coaxially in a cathode sleeve 2 made of tantalum or molybdenum, which is designed as a hollow cylinder.
  • the cathode sleeve 2 In its upper end area - preferably approximately 1.5 mm below the edge - the cathode sleeve 2 is provided with a recess 5 in the form of a window, in the area of which the end of the heater 1 with a kink 4 with the gradation of the cathode cartridge 3 and the cathode sleeve 2 is soldered.
  • the simultaneous soldering of the cathode sleeve to the fastening ring 6 takes place via the solder layer 7, which preferably consists of platinum solder.

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  • Electron Sources, Ion Sources (AREA)
  • Solid Thermionic Cathode (AREA)

Abstract

1. Indirectly heated dispenser cathode, in particular a metal capillary cathode, for electrical discharge vessels, in which cathode an end-face emission substance support disc (8) covers a cathode cartridge (3) which contains the emission reservoir and is fitted to a mounting ring (6), which has an enlarged step at the end face and which is surrounded by a helically constructed heater (1) and is coaxially arranged in a cylindrical cathod sleeve (2) which has cut-out (5a) at the end face the form of a window, in the region of which cut-out (sic) the end of the heater (1), which end has a bend (4), is brazed to the step in the cathode cartridge (3) and to the cathode sleeve (2).

Description

Die Erfindung bezieht sich auf eine Vorratskathode gemäß dem 0berbegriff des Patentanspruchs 1.The invention relates to a supply cathode according to the preamble of patent claim 1.

Kathoden für elektrische Entladungsgefäße, bei denen im Be­trieb Emissionssubstanzen aus einem Emissionsstoffvorrat durch feine Öffnungen eines diesen bedeckenden porösen Emissionsstoffträgers aus insbesondere porös gesinterten hochschmelzendem Metall, wie z.B. Wolfram, zur Kathoden­oberfläche hin wandern und bei denen der im Betrieb Barium abgebende Vorrat aus Bariumoxid besteht, gehen beispiels­weise aus der DE-PS 12 17 503 als bekannt hervor.Cathodes for electrical discharge vessels, in which emission substances from an emission substance supply through fine openings of a porous emission substance carrier covering them, made of in particular porous sintered high-melting metal, such as e.g. Tungsten, migrate to the cathode surface and in which the supply of barium in operation consists of barium oxide, are known, for example, from DE-PS 12 17 503.

Kathoden der beschriebenen Art werden heute weitgehend un­ter anderem in Wanderfeldröhren und Scheibenröhren verwen­det und funktionieren zur vollen Zufriedenheit.Cathodes of the type described are largely used today, among other things, in traveling wave tubes and disc tubes and work to full satisfaction.

Beim Herstellen von insbesondere gleichstrombeheizten Ka­thoden wird oft aus wärmeökonomischen Gründen ein Heizer­ende zugleich mit der Kathodenhülse an die Kathodenpatrone gelötet. Zur Sichtkontrolle des Lotflusses trägt die Ka­thodenhülse eine Ausklinkung an der Stelle, wo Patrone, Heizer und Hülse zugleich verlötet werden. Häufig jedoch findet sich nach dem Lötprozeß eine Lotansammlung am obe­ren Knick des Heizers. Dies führt dann leicht zu einer Drahtversprödung und bei mechanischen Belastungen (Wärme­bewegungen) zum Heizerbruch.When manufacturing in particular direct current heated cathodes, one end of the heater is often soldered to the cathode cartridge at the same time as the cathode sleeve for heat-economic reasons. To visually inspect the solder flow, the cathode sleeve has a notch where the cartridge, heater and sleeve are soldered at the same time. Often, however, there is a build-up of solder on the upper bend of the heater after the soldering process. This then easily leads to wire embrittlement and, in the case of mechanical loads (thermal movements), to the heater breaking.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, bei einer Vorratskathode eine Drahtversprödung und einen da­raus bei mechanischen Belastungen (Wärmebewegungen) resul­tierenden Heizerbruch zu vermeiden.The object of the present invention is to avoid wire embrittlement in a supply cathode and a heater breakage resulting therefrom under mechanical loads (thermal movements).

Diese Aufgabe wird erfindungsgemäß durch eine Vorratska­thode mit den Merkmalen des Anspruchs 1 gelöst.This object is achieved according to the invention by a supply cathode with the features of claim 1.

Weitere vorteilhafte Ausgestaltungen bzw. Weiterbildungen der Erfindung sind Gegenstand zusätzlicher Ansprüche 2 bis 5.Further advantageous refinements or developments of the invention are the subject of additional claims 2 to 5.

Der wesentliche Vorteil der vorgeschlagenen Vorratskathode besteht darin, daß durch die erfindungsgemäße Maßnahme, an­statt der Ausklinkung ein Fenster in der Kathodenhülse vor­zusehen, das vorzugsweise ca. 1,5mm unterhalb des Randes der Kathodenhülse in diese eingebracht ist, erreicht wird, daß die Kapillarwirkung zwischen Kathodenhülse und Katho­denpatrone, über den Umfang gesehen, an keiner Stelle mehr gestört ist und das Lot somit bevorzugt in dieser Zone ge­halten wird. Ein Hinziehen des Lotes bis zum Knick der Heizwendel, bedingt durch Kapillarkräfte zwischen Kathoden­patrone und dem anliegenden Heizerende ist dadurch nicht möglich, da ein Lotüberschuß an dieser Stelle nicht zu befürchten ist. Lotfluß und Heizerknick sind zudem durch das Fenster überprüfbar.The main advantage of the proposed supply cathode is that the measure according to the invention, instead of providing a notch for providing a window in the cathode sleeve, which is preferably introduced about 1.5 mm below the edge of the cathode sleeve, ensures that the capillary action between the cathode sleeve and cathode cartridge, seen over the circumference, is no longer disturbed at any point and the solder is thus preferably held in this zone. It is therefore not possible to pull the solder up to the kink of the heating coil due to capillary forces between the cathode cartridge and the adjacent heater end, since there is no fear of excess solder at this point. The solder flow and heater bend can also be checked through the window.

Anhand der Figuren der Zeichnung soll die Erfindung weiter erläutert werden. Teile, die nicht unbedingt zum Verständ­nis der Erfindung beitragen, sind in den Figuren unbezeich­net oder weggelassen.The invention will be further explained with the aid of the figures of the drawing. Parts that do not necessarily contribute to an understanding of the invention are not shown in the figures or are omitted.

Es zeigen

  • Fig. 1 eine perspektivische Ansicht einer bekannten Vor­ratskathode und
  • Fig. 2 eine perspektivische Ansicht eines bevorzugten Aus­führungsbeispiels der erfindungsgemäßen Vorratska­thode.
Show it
  • Fig. 1 is a perspective view of a known supply cathode and
  • Fig. 2 is a perspective view of a preferred embodiment of the supply cathode according to the invention.

Die in Fig. 1 dargestellte bekannte Vorratskathode besteht im wesentlichen aus einer Emissionsträgerscheibe 8, die stirnseitig eine an einem Befestigungsring 6 aus Molybdän angebrachte Kathodenpatrone 3 bedeckt. Die Kathodenpatrone 3 weist stirnseitig eine nach außen erweiterte Abstufung auf und enthält den Emissionsstoffvorrat. Die Kathodenpa­trone 3 ist von einem wendelförmigen Heizer 1 umgeben, der vorzugsweise mit Gleichstrom betrieben wird. Die Kathoden­patrone 3 ist koaxial in einer Kathodenhülse 2 angeordnet, die hohlzylindrisch ausgebildet ist. Stirnseitig ist die Kathodenhülse 2 mit einer Ausklinkung 5 versehen, in deren Bereich das einen Knick 4 aufweisende Ende des Heizers 1 mit der Abstufung der Kathodenpatrone 3 und der Kathoden­hülse 2 verlötet ist. Die gleichzeitige Befestigung der Kathodenhülse 2 an dem Befestigungsring 6 erfolgt über die Lotschicht 7.The known supply cathode shown in FIG. 1 essentially consists of an emission carrier disk 8, which at the end covers a cathode cartridge 3 attached to a fastening ring 6 made of molybdenum. The cathode cartridge 3 has an outwardly widened gradation on the end face and contains the supply of emissions. The cathode cartridge 3 is surrounded by a helical heater 1, which is preferably operated with direct current. The cathode cartridge 3 is arranged coaxially in a cathode sleeve 2, which is hollow-cylindrical. On the face side, the cathode sleeve 2 is provided with a notch 5, in the area of which the end of the heater 1 which has a kink 4 is soldered to the gradation of the cathode cartridge 3 and the cathode sleeve 2. The cathode sleeve 2 is simultaneously fastened to the fastening ring 6 via the solder layer 7.

Die in Fig. 2 als bevorzugtes Ausführungsbeispiel darge­stellte Vorratskathode, insbesondere Metall-Kapillar(MK)-­Kathode besteht im wesentlichen wiederum aus der Emissions­stoffträgerscheibe 8, die stirnseitig die an dem Befesti­gungsring 6, der vorzugsweise aus Molybdän besteht, ange­brachte Kathodenpatrone 3 abschließt. Die Kathodenpatrone 3 ist nach oben auf die Emissionsstoffträgerscheibe 8 hin durch eine Abstufung erweitert und enthält als Emissions­stoffvorrat vorzugsweise Bariumoxid. Die Kathodenpatrone 3 ist von einem wendelförmigen Heizer 1 umgeben, der vorzugs­weise mit Gleichstrom geheizt wird. Die Kathodenpatrone 3 ist koaxial in einer Kathodenhülse 2 aus Tantal oder Mo­lybdän angeordnet, die hohlzylinderförmig ausgebildet ist. In ihrem oberen Stirnseitenbereich - vorzugsweise etwa 1,5mm unterhalb des Randes - ist die Kathodenhülse 2 mit einer Ausnehmung 5 in Form eines Fensters versehen, in des­sen Bereich das einen Knick 4 aufweisende Ende des Heizers 1 mit der Abstufung der Kathodenpatrone 3 und der Kathoden­hülse 2 verlötet ist. Das gleichzeitige Verlöten der Katho­denhülse mit dem Befestigungsering 6 erfolgt über die Lot­schicht 7, die vorzugsweise aus Platinlot besteht.The supply cathode shown in FIG. 2 as a preferred exemplary embodiment, in particular a metal capillary (MK) cathode, essentially again consists of the emission carrier plate 8, which closes the end of the cathode cartridge 3 attached to the fastening ring 6, which preferably consists of molybdenum. The cathode cartridge 3 is extended upwards towards the emission carrier plate 8 by a gradation and preferably contains barium oxide as the emission agent supply. The cathode cartridge 3 is surrounded by a helical heater 1, which is preferably heated with direct current. The cathode cartridge 3 is arranged coaxially in a cathode sleeve 2 made of tantalum or molybdenum, which is designed as a hollow cylinder. In its upper end area - preferably approximately 1.5 mm below the edge - the cathode sleeve 2 is provided with a recess 5 in the form of a window, in the area of which the end of the heater 1 with a kink 4 with the gradation of the cathode cartridge 3 and the cathode sleeve 2 is soldered. The simultaneous soldering of the cathode sleeve to the fastening ring 6 takes place via the solder layer 7, which preferably consists of platinum solder.

Claims (5)

1. Indirekt geheizte Vorratskathode, insbesondere Metall-­Kapillar-Kathode, für elektrische Entladungsgefäße, bei der eine stirnseitige Emissionsstoffträgerscheibe eine den Emissionsvorrat enthaltende, an einem Befestigungsring an­gebrachte Kathodenpatrone abdeckt, die stirnseitig eine er­weiterte Abstufung besitzt und die, von einem wendelförmig ausgebildeten Heizer umgeben, koaxial in einer zylinderför­migen Kathodenhülse angeordnet ist, welche stirnseitig eine Ausnehmung in Form einer Ausklinkung hat, in deren Be­reich das einen Knick aufweisende Ende des Heizers mit der Abstufung der Kathodenpatrone und der Kathodenhülse verlö­tet ist, dadurch gekennzeichnet, daß die Ausnehmung (5) in der Kathodenhülse (2) am Ende des Heizers (1) im Bereich des Knickes (4) die Form eines Fensters hat.1.Indirectly heated supply cathode, in particular metal capillary cathode, for electrical discharge vessels, in which an emission carrier plate on the front covers a cathode cartridge containing the emission reserve and attached to a fastening ring, which has an enlarged gradation on the end face and which is surrounded by a helically shaped heater. is arranged coaxially in a cylindrical cathode sleeve, which has a recess in the form of a notch on the end face, in the area of which the bent end of the heater is soldered to the gradation of the cathode cartridge and the cathode sleeve, characterized in that the recess (5) in the Cathode sleeve (2) at the end of the heater (1) in the area of the bend (4) has the shape of a window. 2. Indirekt geheizte Vorratskathode nach Anspruch 1, dadurch gekennzeichnet, daß die fensterförmige Ausnehmung (5) in der Kathodenhülse (2) un­gefähr 1,5mm unterhalb des Randes der Kathodenhülse (2) vorgesehen ist.2. Indirectly heated supply cathode according to claim 1, characterized in that the window-shaped recess (5) in the cathode sleeve (2) is provided approximately 1.5 mm below the edge of the cathode sleeve (2). 3. Indirekt geheizte Vorratskathode nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Heizer (1) in der Form einer Einfach- oder Bifilar-Wen­del ausgebildet ist.3. Indirectly heated supply cathode according to claim 1 or 2, characterized in that the heater (1) is designed in the form of a single or bifilar coil. 4. Indirekt geheizte Vorratskathode nach einem der Ansprü­che 1 bis 3, gekennzeichnet durch die Verwendung eines Heizers (1), der mit Gleichstrom be­heizt wird.4. Indirectly heated supply cathode according to one of claims 1 to 3, characterized by the use of a heater (1) which is heated with direct current. 5. Verfahren zum Herstellen einer indirekt geheizten Vor­ratskathode nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der Heizer (1), die Kathodenhülse (2), die Kathodenpatrone (3) und der Befesti­gungsring (6) gleichzeitig verlötet werden.5. A method for producing an indirectly heated supply cathode according to one of claims 1 to 4, characterized in that the heater (1), the cathode sleeve (2), the cathode cartridge (3) and the fastening ring (6) are soldered simultaneously.
EP86110820A 1985-09-27 1986-08-05 Indirectly heated dispenser-type cathode for electric discharge vessels Expired EP0220396B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3534553 1985-09-27
DE3534553 1985-09-27

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EP0220396A1 true EP0220396A1 (en) 1987-05-06
EP0220396B1 EP0220396B1 (en) 1989-11-02

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2735902A1 (en) * 1995-06-21 1996-12-27 Samsung Display Devices Co Ltd CATHODE SUPPORT FOR AN ELECTRON CANON FOR CATHODE TUBES
EP0851453A1 (en) * 1996-12-31 1998-07-01 Eaton Corporation Endcap for indirectly heated cathode of ion source

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105788998B (en) * 2016-04-19 2017-11-21 北京航空航天大学 A kind of small size, small-power barium tungsten hollow cathode

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, unexamined applications, Sektion E, Band 4, Nr. 121, 27. August, 1980 THE PATENT OFFICE JAPANESE GOVERNMENT Seite 81 E 23 * JP - A - 55-76 551 * *
PATENT ABSTRACTS OF JAPAN, unexamined applications, Sektion E, Band 4, Nr. 8, 22. Janner 1980 THE PATENT OFFICE JAPANESE GOVERNMENT Seite 78 E 166 * JP - A - 54-147 371 * *
PATENT ABSTRACTS OF JAPAN, unexamined applications, Sektion E, Band 5, Nr. 44, 24. Marz 1981 THE PATENT OFFICE JAPANESE GOVERNMENT Seite 77 E 50 * JP - A - 55-166 845 * *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2735902A1 (en) * 1995-06-21 1996-12-27 Samsung Display Devices Co Ltd CATHODE SUPPORT FOR AN ELECTRON CANON FOR CATHODE TUBES
EP0851453A1 (en) * 1996-12-31 1998-07-01 Eaton Corporation Endcap for indirectly heated cathode of ion source

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Publication number Publication date
EP0220396B1 (en) 1989-11-02
DE3666750D1 (en) 1989-12-07

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