EP0130395A1 - Fast warm-up cathode - Google Patents

Fast warm-up cathode Download PDF

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Publication number
EP0130395A1
EP0130395A1 EP84106351A EP84106351A EP0130395A1 EP 0130395 A1 EP0130395 A1 EP 0130395A1 EP 84106351 A EP84106351 A EP 84106351A EP 84106351 A EP84106351 A EP 84106351A EP 0130395 A1 EP0130395 A1 EP 0130395A1
Authority
EP
European Patent Office
Prior art keywords
cathode
metal layer
outer conductor
inner conductor
cathode according
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.)
Withdrawn
Application number
EP84106351A
Other languages
German (de)
French (fr)
Inventor
Erich Dr.-Ing. Dipl.-Ing. Glass
Hinrich Dr. Rer. Nat. Dipl.-Phys. Heynisch
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of EP0130395A1 publication Critical patent/EP0130395A1/en
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J23/00—Details of transit-time tubes of the types covered by group H01J25/00
    • H01J23/02—Electrodes; Magnetic control means; Screens
    • H01J23/04—Cathodes
    • 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
    • H01J1/15—Cathodes heated directly by an electric current
    • H01J1/16—Cathodes heated directly by an electric current characterised by the shape
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
    • Y10T428/131—Glass, ceramic, or sintered, fused, fired, or calcined metal oxide or metal carbide containing [e.g., porcelain, brick, cement, etc.]
    • Y10T428/1314—Contains fabric, fiber particle, or filament made of glass, ceramic, or sintered, fused, fired, or calcined metal oxide, or metal carbide or other inorganic compound [e.g., fiber glass, mineral fiber, sand, etc.]

Definitions

  • the invention relates to a directly heated oxide cathode, in particular for runtime tubes in pulse mode.
  • Directly heated oxide cathodes for electron tubes are known, for example, from DE-AS 2160145 and DE-AS 2904653.
  • Such oxide cathodes essentially consist of a cathode body (base metal plate) made of a high-resistance alloy and an electron emission layer.
  • the base metal plate is bow-shaped.
  • the oxide layer is applied to the outside of the flat part of the base metal plate.
  • Connections for the DC voltage source are provided at the ends of the base metal plate facing away from it.
  • the invention has for its object to provide a directly heated oxide cathode, especially for runtime tubes, which is characterized by a very short heating time.
  • the directly heated oxide cathode shown schematically in section in the figure essentially consists of a cylindrical outer conductor 1.
  • An inner conductor 2 is arranged coaxially in this.
  • the inner conductor 2 is Rb 1 Lk / 28.6.1983 attached to the outer conductor 1 by a ceramic support disk 3.
  • a thin metal layer 4, preferably made of nickel, is provided on one end of the cathode and is soldered to the inner conductor 2 and the outer conductor 1.
  • An electron-emitting oxide layer 5, for example barium oxide layer, is applied on the outside of the thin metal layer 4.
  • the cathode is designed as a matrix cathode
  • nickel powder provided with a binder and preferably sintered is sprayed onto the thin metal layer 4, which preferably consists of nickel.
  • the emission mass (oxide layer 5) is then applied.
  • Inner conductor 2 and outer conductor 1, which are preferably made of nickel or a nickel alloy, are thick-walled, so that no heating takes place when the current is high.
  • the direct current from the inner conductor 2 to the outer conductor flows over the thin-walled Kahtodenblech (metal layer 4) and heats it up quickly.
  • the thin metal layer 4 is concave and has an inhomogeneous wall thickness. This measure and a suitable choice of material for the inner and outer conductors can achieve a uniform temperature distribution of the cathode.

Landscapes

  • Electrodes For Cathode-Ray Tubes (AREA)
  • Solid Thermionic Cathode (AREA)

Abstract

Die Erfindung bezieht sich auf eine direkt geheizte Oxidkathode. Diese Kathode soll eine sehr kurze Anheizzeit haben. Die Erfindung sieht hierzu vor, daß ein Außenleiter (1) zylinderförmig ausgebildet und in diesem ein Innenleiter (2) mittels einer Keramikabstützscheibe (3) koaxial angeordnet ist, und daß auf einer Stirnseite eine mit dem Außenleiter (1) und dem Innenleiter (2) verbundene Metallschicht (4) vorgesehen ist, die mit einer Elektronen emittierenden Oxidschicht (5) versehen ist. Die erfindungsgemäße Oxidkathode wird insbesondere bei Lauffeldröhren im Pulsbetrieb verwendet.The invention relates to a directly heated oxide cathode. This cathode should have a very short heating time. To this end, the invention provides that an outer conductor (1) is cylindrical and an inner conductor (2) is arranged coaxially therein by means of a ceramic support disc (3), and that on one end face one with the outer conductor (1) and the inner conductor (2) Connected metal layer (4) is provided, which is provided with an electron-emitting oxide layer (5). The oxide cathode according to the invention is used in particular in the case of runway tubes in pulsed operation.

Description

Die Erfindung betrifft eine direkt geheizte Oxidkathode, insbesondere für Laufzeitröhren im Pulsbetrieb.The invention relates to a directly heated oxide cathode, in particular for runtime tubes in pulse mode.

Direkt geheizte Oxidkathoden für Elektronenröhren sind beispielsweise aus der DE-AS 2160145 und der DE-AS 2904653 bekannt. Derartige Oxidkathoden bestehen im wesentlichen aus einem Kathodenkörper (Basismetallplatte) aus einer Hochwiderstandslegierung und einer Elektronenemissionsschicht. Die Basismetallplatte ist dabei bügelförmig ausgebildet. Die Oxidschicht ist auf der Außenseite des flachen Teils der Basismetallplatte aufgebracht. An den davon abgewendeten Enden der Basismetallplatte sind Anschlüsse für die Gleichspannungsquelle vorgesehen.Directly heated oxide cathodes for electron tubes are known, for example, from DE-AS 2160145 and DE-AS 2904653. Such oxide cathodes essentially consist of a cathode body (base metal plate) made of a high-resistance alloy and an electron emission layer. The base metal plate is bow-shaped. The oxide layer is applied to the outside of the flat part of the base metal plate. Connections for the DC voltage source are provided at the ends of the base metal plate facing away from it.

Der Erfindung liegt die Aufgabe zugrunde, eine direkt geheizte Oxidkathode insbesondere für Laufzeitröhren zu schaffen, die sich durch eine sehr kurze Anheizzeit auszeichnet.The invention has for its object to provide a directly heated oxide cathode, especially for runtime tubes, which is characterized by a very short heating time.

Diese Aufgabe wird erfindungsgemäB durch eine direkt geheizte Kathode mit den Merkmalen des Anspruchs 1 gelöst.This object is achieved according to the invention by a directly heated cathode with the features of claim 1.

Weitere vorteilhafte Ausgestaltungen der Erfindung sind Gegenstand zusätzlicher Ansprüche.Further advantageous embodiments of the invention are the subject of additional claims.

Die Erfindung wird anhand eines Ausführungsbeispiels weiter erläutert.The invention is further explained using an exemplary embodiment.

Die in der Figur schematisch im Schnitt dargestellte direkt geheizte Oxidkathode besteht im wesentlichen aus einem zylinderförmigen Außenleiter 1. In diesem ist ein Innenleiter 2 koaxial angeordnet. Der Innenleiter 2 ist Rb 1 Lk/28.6.1983 dabei durch eine Keramikabstützscheibe 3 am AuBenleiter 1 befestigt. Auf der einen Stirnseite der Kathode ist eine vorzugsweise aus Nickel bestehende dünne Metallschicht 4 vorgesehen, die mit dem Innenleiter 2 und dem Außenleiter 1 verlötet ist. Auf der Außenseite der dünnen Metallschicht 4 ist eine Elektronen emittierende Oxidschicht 5, beispielsweise Bariumoxidschicht, aufgebracht.The directly heated oxide cathode shown schematically in section in the figure essentially consists of a cylindrical outer conductor 1. An inner conductor 2 is arranged coaxially in this. The inner conductor 2 is Rb 1 Lk / 28.6.1983 attached to the outer conductor 1 by a ceramic support disk 3. A thin metal layer 4, preferably made of nickel, is provided on one end of the cathode and is soldered to the inner conductor 2 and the outer conductor 1. An electron-emitting oxide layer 5, for example barium oxide layer, is applied on the outside of the thin metal layer 4.

Für den Fall, daß die Kathode als Matrixkathode ausgebildet ist, wird auf die vorzugsweise aus Nickel bestehende dünne Metallschicht 4 mit einem Binder versehenes Nickelpulver aufgesprüht und aufgesintert. Anschließend wird die Emissionsmasse (Oxidschicht 5) aufgebracht. Innenleiter 2 und Außenleiter 1, die vorzugsweise aus Nickel oder einer Nickellegierung bestehen, sind dickwandig, damit bei hohem Stromdurchgang keine Aufheizung erfolgt. Der Gleichstrom vom Innenleiter 2 zum Außenleiter fließt über das dünnwandige Kahtodenblech (Metallschicht 4) und heizt dieses schnell auf. Die dünne Metallschicht 4 ist in diesem bevorzugten Ausführungsbeispiel konkav ausgebildet und weist eine inhomogene Wandstärke auf. Durch diese Maßnahme sowie durch eine geeignete Materialauswahl für Innen- und Außenleiter kann man eine gleichmäßige Temperaturverteilung der Kathode erreichen.In the event that the cathode is designed as a matrix cathode, nickel powder provided with a binder and preferably sintered is sprayed onto the thin metal layer 4, which preferably consists of nickel. The emission mass (oxide layer 5) is then applied. Inner conductor 2 and outer conductor 1, which are preferably made of nickel or a nickel alloy, are thick-walled, so that no heating takes place when the current is high. The direct current from the inner conductor 2 to the outer conductor flows over the thin-walled Kahtodenblech (metal layer 4) and heats it up quickly. In this preferred exemplary embodiment, the thin metal layer 4 is concave and has an inhomogeneous wall thickness. This measure and a suitable choice of material for the inner and outer conductors can achieve a uniform temperature distribution of the cathode.

Claims (7)

1. Direkt geheizte Oxidkathode, insbesondere für Laufzeitröhrem im Pulsbetrieb, dadurch gekennzeichnet, daß ein AuBenleiter (1) zylinderförmig ausgebildet und in diesem ein Innenleiter (2) mittels einer Keramikabstützscheibe (3) koaxial angeordnet ist, und daß auf einer Stirnseite eine mit dem Außenleiter (1) und dem Innenleiter (2) verbundene Metallschicht (4) vorgesehen ist, die mit einer'Elektronen emittierenden Oxidschicht (5) versehen ist.1. Directly heated oxide cathode, in particular for runtime tubes in pulsed operation, characterized in that an outer conductor (1) is cylindrical and in this an inner conductor (2) is arranged coaxially by means of a ceramic support disc (3), and that on one end face one with the outer conductor (1) and the inner conductor (2) connected metal layer (4) is provided, which is provided with an 'electron-emitting oxide layer (5). Kathode nach Anspruch 1, dadurch gekennzeichnet, daß die Metallschicht sowie der Innenleiter (2) und der Außenleiter (1) aus Nickel oder einer Nickellegierung bestehen.Cathode according to claim 1, characterized in that the metal layer and the inner conductor (2) and the outer conductor (1) consist of nickel or a nickel alloy. 3. Kathode nach den Ansprüchen 1 oder 2, dadurch gekennzeichnet, daß die Oxidschicht (5) eine Alkali- oder Erdalkalioxidschicht ist.3. Cathode according to claims 1 or 2, characterized in that the oxide layer (5) is an alkali or alkaline earth oxide layer. 4. Kathode nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Metallschicht (4) konkav ausgebildet ist.4. Cathode according to one of claims 1 to 3, characterized in that the metal layer (4) is concave. 5. Kathode nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Metallschicht (4) eine inhomogene Wandstärke aufweist.5. Cathode according to one of claims 1 to 4, characterized in that the metal layer (4) has an inhomogeneous wall thickness. 6. Kathode nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Metallschicht (4) wesentlich dünnwandiger als der Außenleiter (1) und der Innenleiter (2) ist.6. Cathode according to one of claims 1 to 5, characterized in that the metal layer (4) is substantially thinner than the outer conductor (1) and the inner conductor (2). 7. Kathode nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die Kathode eine Matrixkathode ist.7. Cathode according to one of claims 1 to 6, characterized in that the cathode is a matrix cathode.
EP84106351A 1983-06-29 1984-06-04 Fast warm-up cathode Withdrawn EP0130395A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19833323473 DE3323473A1 (en) 1983-06-29 1983-06-29 QUICK HEATING CATHODE
DE3323473 1983-06-29

Publications (1)

Publication Number Publication Date
EP0130395A1 true EP0130395A1 (en) 1985-01-09

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EP84106351A Withdrawn EP0130395A1 (en) 1983-06-29 1984-06-04 Fast warm-up cathode

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US (1) US4567071A (en)
EP (1) EP0130395A1 (en)
DE (1) DE3323473A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0380205A1 (en) * 1989-01-23 1990-08-01 Varian Associates, Inc. Fast warm-up cathode for high power vacuum tubes
WO2014064227A1 (en) * 2012-10-26 2014-05-01 Thales Quick-starting thermionic cathode and method for producing same

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB295637A (en) * 1927-08-15 1929-12-13 Siegmund Loewe Heated filament for thermionic valves
US2847604A (en) * 1955-06-02 1958-08-12 Gen Electric Thermionic cathode and direct current heater assembly
US2875367A (en) * 1954-10-22 1959-02-24 Gen Electric Cathode structures
DE1564951A1 (en) * 1966-12-19 1970-03-05 Telefunken Patent Cathode arrangement

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL113461C (en) * 1961-03-08
DE1223063B (en) * 1965-06-30 1966-08-18 Siemens Ag Indirectly heated cathode for electrical discharge vessels and process for temperature control of the cathode
JPS4822295B1 (en) * 1970-12-04 1973-07-05
DE2159626A1 (en) * 1970-12-04 1972-06-22 Hitachi Ltd Method of manufacturing a fluorescent screen of a cathode ray tube
JPS5816737B2 (en) * 1978-04-24 1983-04-01 株式会社日立製作所 Oxide cathode for electron tubes
JPS5566819A (en) * 1978-11-15 1980-05-20 Hitachi Ltd Oxide cathode for electron tube
JPS5596531A (en) * 1979-01-19 1980-07-22 Hitachi Ltd Directly heated cathode for electron tube
JPS55144631A (en) * 1979-04-28 1980-11-11 Hitachi Ltd Directly-heated cathode for electronic tube
NL8100928A (en) * 1981-02-26 1982-09-16 Philips Nv OXYD CATHODE.

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB295637A (en) * 1927-08-15 1929-12-13 Siegmund Loewe Heated filament for thermionic valves
US2875367A (en) * 1954-10-22 1959-02-24 Gen Electric Cathode structures
US2847604A (en) * 1955-06-02 1958-08-12 Gen Electric Thermionic cathode and direct current heater assembly
DE1564951A1 (en) * 1966-12-19 1970-03-05 Telefunken Patent Cathode arrangement

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENTS ABSTRACTS OF JAPAN, Band 6, Nr. 211 (E-137)[1089], 23. Oktober 1982; & JP - A - 57 115 739 (TOKYO SHIBAURA DENKI K.K.) 19.07.1982 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0380205A1 (en) * 1989-01-23 1990-08-01 Varian Associates, Inc. Fast warm-up cathode for high power vacuum tubes
US5015908A (en) * 1989-01-23 1991-05-14 Varian Associates, Inc. Fast warm-up cathode for high power vacuum tubes
WO2014064227A1 (en) * 2012-10-26 2014-05-01 Thales Quick-starting thermionic cathode and method for producing same
FR2997548A1 (en) * 2012-10-26 2014-05-02 Thales Sa FAST-START THERMOELECTRONIC EMISSION CATHODE AND PROCESS FOR PREPARING THE SAME

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Publication number Publication date
US4567071A (en) 1986-01-28
DE3323473A1 (en) 1985-01-03

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Inventor name: HEYNISCH, HINRICH, DR. RER. NAT.DIPL.-PHYS.

Inventor name: GLASS, ERICH, DR.-ING. DIPL.-ING.