EP0010128B1 - Direkt geheizte Kathode für eine Elektronenröhre mit koaxialem Elektrodenaufbau und Verfahren zum Herstellen einer derartigen Kathode - Google Patents

Direkt geheizte Kathode für eine Elektronenröhre mit koaxialem Elektrodenaufbau und Verfahren zum Herstellen einer derartigen Kathode Download PDF

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Publication number
EP0010128B1
EP0010128B1 EP19790102866 EP79102866A EP0010128B1 EP 0010128 B1 EP0010128 B1 EP 0010128B1 EP 19790102866 EP19790102866 EP 19790102866 EP 79102866 A EP79102866 A EP 79102866A EP 0010128 B1 EP0010128 B1 EP 0010128B1
Authority
EP
European Patent Office
Prior art keywords
cathode
directly heated
hollow cylinder
metal layer
thin metal
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
Application number
EP19790102866
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0010128A1 (de
Inventor
Ingo Behling
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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6048373&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0010128(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP0010128A1 publication Critical patent/EP0010128A1/de
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Expired legal-status Critical Current

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Classifications

    • 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
    • H01J9/02—Manufacture of electrodes or electrode systems
    • H01J9/04—Manufacture of electrodes or electrode systems of thermionic cathodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J19/00—Details of vacuum tubes of the types covered by group H01J21/00
    • H01J19/02—Electron-emitting electrodes; Cathodes
    • H01J19/04—Thermionic cathodes
    • H01J19/08—Cathodes heated directly by an electric current

Definitions

  • the invention relates to a directly heated cathode for electron tubes, in particular transmitter tubes, with a coaxial structure of the electrodes and their bushings, which has a hollow cylinder which is fastened at one end to an annular cathode feed and at the other end to a cathode cap which is coaxially in the hollow cylinder extending power supply is supported.
  • Such a directly heated cathode is known for example from DE-A-24 15 384. From this DE-A-24 15 384 and in particular from FR-A-23 03 372 it is further known that for the production of cathodes which are directly heated and which have a metal film as an emission layer, e.g. Tungsten carbide with thorium film, tungsten wire used as carrier. The required surface and mechanical strength is achieved by arranging the wires appropriately, in the case of transmitter tubes in the form of a mesh or needle. The structure of the cathodes inevitably results in an inhomogeneous cathode surface, which has an effect on the electrode system. There are also difficulties in manufacturing cathodes with narrow wire gaps. In the case of transmitter tubes with narrow grid-cathode distances and mesh cathodes, the different distances (outer wire and inner wire of the mesh cathode) have a disadvantageous effect on the electrical data of the electron tube.
  • cathodes with a homogeneous surface have only been known as oxide matrix or storage cathodes. Certain operating conditions of electron tubes, in particular transmitter tubes of higher power, prohibit the use of such cathodes.
  • the object of the invention is therefore to create a directly heated cathode, the carrier of which is not made of wire, so that inhomogeneities on the cathode surface are avoided.
  • a directly heated cathode for electron tubes, in particular transmitter tubes, of the type mentioned at the outset according to the invention that the hollow cylinder consists of pyrolytic graphite and is coated with a thin metal layer as an emission layer.
  • the thin metal layer preferably consists of tungsten carbide and thorium or a thorium oxide.
  • the thin metal layer (cathode layer), preferably made of tungsten carbide and thorium or thorium oxide, can advantageously be applied to the hollow cylinder of the cathode consisting of pyrolytic graphite by the following methods.
  • Either thorium-tungsten powder is deposited cataphoretically onto the hollow cylinder as a thin metal layer and then sintered on, or a thin metal layer consisting of thorium and tungsten is vapor-deposited onto the hollow cylinder with the aid of an Ekeltron beam.
  • Another expedient method consists in that thorium-tungsten is deposited as a thin metal layer from the gas phase on the hollow cylinder (carrier body) consisting of pyrolytic graphite.
  • the directly heated cathodes according to the invention have the following advantages in particular compared to mesh cathodes.
  • the stability of the cathodes is determined by the pyrolytic graphite and is much greater in comparison to tungsten at the operating temperatures.
  • flat cathodes or structural cathodes can be produced. Bulging of the cathode cylinder due to a length expansion no longer occurs when the electron tube is switched on.
  • the figure shows a longitudinal section as an exemplary embodiment of a transmitter triode with coaxially arranged cylindrical electrodes and bushings. These include the central, directly heated cathode, which is connected to the feed-through plate or inner cathode connecting ring 5 and the support tube 6 (outer cathode connection).
  • the hollow cylinder 1 of the cathode is initially surrounded by the grid electrode 3 and then by the anode 4 with the associated support tubes 7, 11.
  • the actual discharge vessel is formed, in addition to the anode 4 designed as an external anode, essentially by the feed-through foot, which is used in conventional metal-ceramic technology alternately composed of metal support tubes or discs and ceramic rings.
  • the cathode connections 5, 6 fastened on the tube base each end in a cathode cap 9 or in an annular cathode connection 12, to which two the actual hollow cylinder 1 of the cathode is fastened is.
  • the respective cathode fastenings are provided with the reference number 2.
  • a flexible power supply line 8 is attached to the cathode cap 9 and leads from the inner cathode connection 5 to the hollow cylinder 1.
  • the hollow cylinder 1 of the cathode consists of pyrolytic graphite and is coated with a thin metal layer 10, preferably of tungsten carbide and thorium, as an emission layer.
EP19790102866 1978-08-31 1979-08-08 Direkt geheizte Kathode für eine Elektronenröhre mit koaxialem Elektrodenaufbau und Verfahren zum Herstellen einer derartigen Kathode Expired EP0010128B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2838020 1978-08-31
DE19782838020 DE2838020B2 (de) 1978-08-31 1978-08-31 Direkt geheizte Kathode für eine Elektronenröhre mit koaxialem Elektrodenaufbau und Verfahren zu ihrer Herstellung

Publications (2)

Publication Number Publication Date
EP0010128A1 EP0010128A1 (de) 1980-04-30
EP0010128B1 true EP0010128B1 (de) 1983-02-16

Family

ID=6048373

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19790102866 Expired EP0010128B1 (de) 1978-08-31 1979-08-08 Direkt geheizte Kathode für eine Elektronenröhre mit koaxialem Elektrodenaufbau und Verfahren zum Herstellen einer derartigen Kathode

Country Status (2)

Country Link
EP (1) EP0010128B1 (ja)
DE (1) DE2838020B2 (ja)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2498372A1 (fr) * 1981-01-16 1982-07-23 Thomson Csf Cathode a chauffage direct, son procede de fabrication, et tube electronique incorporant une telle cathode

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE476381A (ja) * 1946-09-06
BE562310A (ja) * 1956-11-14
FR1344220A (fr) * 1962-03-02 1963-11-29 Thomson Houston Comp Francaise Grille pour tubes électroniques
DE1614680C3 (de) * 1967-12-13 1973-10-11 Siemens Ag, 1000 Berlin U. 8000 Muenchen Elektrisches Entladungsgefäß, insbe sondere HF Leistungsrohre
NL134258C (ja) * 1968-04-29 1900-01-01
US3532923A (en) * 1969-03-17 1970-10-06 Ibm Pyrolytic graphite support for lanthanum hexaboride cathode emitter
FR2303372A1 (fr) * 1975-03-04 1976-10-01 Thomson Csf Procede de prechauffage des cathodes en tungstene thorie de tubes electroniques de puissance, et tubes electroniques soumis a un tel procede
JPS5277661A (en) * 1975-12-24 1977-06-30 Jeol Ltd Electron gun
DE2625021C3 (de) * 1976-06-03 1979-06-07 Siemens Ag, 1000 Berlin Und 8000 Muenchen Elektronenröhre, insbesondere Senderöhre

Also Published As

Publication number Publication date
DE2838020A1 (de) 1980-03-13
DE2838020B2 (de) 1981-04-02
EP0010128A1 (de) 1980-04-30
DE2838020C3 (ja) 1987-06-19

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