CH207928A - Method of manufacturing an electric discharge tube with a secondary emission electrode. - Google Patents

Method of manufacturing an electric discharge tube with a secondary emission electrode.

Info

Publication number
CH207928A
CH207928A CH207928DA CH207928A CH 207928 A CH207928 A CH 207928A CH 207928D A CH207928D A CH 207928DA CH 207928 A CH207928 A CH 207928A
Authority
CH
Switzerland
Prior art keywords
secondary emission
emission electrode
discharge tube
electric discharge
manufacturing
Prior art date
Application number
Other languages
German (de)
Inventor
Gloeilampenfabrieken N Philips
Original Assignee
Philips 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 Nv filed Critical Philips Nv
Publication of CH207928A publication Critical patent/CH207928A/en

Links

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
    • H01J9/12—Manufacture of electrodes or electrode systems of photo-emissive cathodes; of secondary-emission electrodes
    • H01J9/125—Manufacture of electrodes or electrode systems of photo-emissive cathodes; of secondary-emission electrodes of secondary emission electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2201/00—Electrodes common to discharge tubes
    • H01J2201/32—Secondary emission electrodes

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Discharge Lamp (AREA)

Description

  

  Verfahren zur Herstellung einer elektrischen Entladungsröhre  mit einer     Sekundäremissionselektrode.       Die Erfindung bezieht sich auf ein Ver  fahren zur     Herstellung    einer     elektrischen          Entladungsröhre    mit einer     Sekundäremis-          sionselektrode,    das, heisst einer     Elektrode,    die  auf     wenigstens        einem    Teil ihrer     Oberfläche     aus einem Stoff besteht, der leicht Sekundär  elektronen aussendet, wenn er von einem     Pri-          märelektronenstrom    getroffen wird.  



  Es ist schon bekannt, derartige     Sekundär-          emissionselektroden    mit den     Metallen    und  Oxyden der     Alkalimetalleoder        Erdalkalime-          talle,    z. B.     Barium.,        Strontium,    Cäsium     her-          zustellen.    Auch ist schon vorgeschlagen wor  den,     Magnesium    oder Aluminium zu     verwen-          den.    Diese Elektroden können sehr leicht  durch Anwendung der für Primärkathoden  bekannten Herstellungsweisen     angefertigt     werden.

   Auch sind Methoden bekannt, um das       darr    aktive Metall enthaltende     Material    von  einer Primärkathode aus auf die     Sekundär-          --misisionselektrode        überzudampfen.    Bei diesen  Verfahren     wird    die Röhre     zunächst        evakuiert       und dann wird das     Metall        oder    -die Verbin  dung verdampft, zum Beispiel von der Pri  märkathode     übergedampft.     



  Aus     Untersuchungen,    die von der     Anmel-          derin        angestellt    wurden, hat     es,        sich    nun er  geben, dass     diese    an sich     bekannten        VeTfah-          ren    nicht ohne     weiteres    die     beste    Sekundär  emission liefern.  



  Gemäss der     vorliegenden        Erfindung    kann  eine     bessere        Sekundäremie@sionselektrode    da  durch erhalten werden, dass eine Metallver  bindung, zweckmässig eines     Alkalimetalles,     eines     Erdalkalimetalles,    des     Magnesiums    oder  Aluminiums, in einer     indifferenten,    nicht mit  ,der Verbindung reagierenden     Gasatmosphäre     verdampft     wird.    Die     Gasatmosphäre    kann       zweckmässigerweise        aus    Argon oder Stick  stoff oder dergleichen bestehen.  



  Durch die Verdampfung der     ,'Verbindung     in einer Gasatmosphäre von     hinreichend     hohem Druck wird eine     Sekundäremissions          elektrode        erhalten,        die        eine        ergiebige    Auz-           lösung    von Sekundärelektronen beim Auf  treffen von Primärelektronen ermöglicht.

    Diese besonders gute Sekundäremission hängt       wahrscheinlich    mit der durch die Verdamp  fung durch eine Gasatmosphäre erhaltenen  Struktur der     Überzüge    der     Sekundäremis-          sionse@lektrode    zusammen.



  Method of manufacturing an electric discharge tube with a secondary emission electrode. The invention relates to a method for producing an electrical discharge tube with a secondary emission electrode, that is to say an electrode which consists on at least part of its surface of a substance which easily emits secondary electrons when it is triggered by a primary electron stream is hit.



  It is already known to use such secondary emission electrodes with the metals and oxides of the alkali metals or alkaline earth metals, e.g. B. barium., Strontium, cesium. It has also already been proposed to use magnesium or aluminum. These electrodes can be made very easily using the manufacturing methods known for primary cathodes.

   Methods are also known for vapor deposition of the material containing active metal from a primary cathode onto the secondary -misisionselectrode. In this process, the tube is first evacuated and then the metal or compound is vaporized, for example over vaporized from the primary cathode.



  Investigations carried out by the applicant have now shown that these methods, known per se, do not simply provide the best secondary emission.



  According to the present invention, a better secondary chemistry electrode can be obtained by evaporating a metal compound, suitably an alkali metal, an alkaline earth metal, magnesium or aluminum, in an inert gas atmosphere that does not react with the compound. The gas atmosphere can expediently consist of argon or stick material or the like.



  By evaporation of the "compound" in a gas atmosphere of sufficiently high pressure, a secondary emission electrode is obtained, which enables a productive dissolution of secondary electrons when primary electrons strike.

    This particularly good secondary emission is probably related to the structure of the coatings of the secondary emission electrode obtained by evaporation through a gas atmosphere.

Claims (1)

PATENTANSPRUCH: Verfahren zur Herstellung einer elek- trischen Entladungsröhre mit einer Sekundär emissionselektrode, wobei der aus- einer 31e- tallverbindung bestehende. sekundäremittie rende Stoff auf die Sekundäremissionselek- trode aufgedampft wird, dadurch gekenn- zeichnet, da.ss die Verdampfung der Verbin dung in einer indifferenten, nicht mit der Verbindung reagierenden Gasatmosphäre stattfindet. <B>UNTERANSPRÜCHE:</B> 1. PATENT CLAIM: Process for the production of an electric discharge tube with a secondary emission electrode, the one consisting of a metal compound. secondary emitting substance is vapor deposited onto the secondary emission electrode, characterized in that the vaporization of the compound takes place in an inert gas atmosphere that does not react with the compound. <B> SUBClaims: </B> 1. Verfahren nach Patentanspruch, dadurch gekennzeichnet, da.ss die indifferente Gas atmosphäre aus Argon besteht. ?. Verfahren nach Patentanspruch, dadurch gekennzeichnet, dass die indifferente Gas atmosphäre ans Stickstoff besteht. Method according to claim, characterized in that the inert gas atmosphere consists of argon. ?. Method according to claim, characterized in that the inert gas atmosphere consists of nitrogen.
CH207928D 1937-03-30 1938-03-28 Method of manufacturing an electric discharge tube with a secondary emission electrode. CH207928A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL207928X 1937-03-30

Publications (1)

Publication Number Publication Date
CH207928A true CH207928A (en) 1939-12-15

Family

ID=19778653

Family Applications (1)

Application Number Title Priority Date Filing Date
CH207928D CH207928A (en) 1937-03-30 1938-03-28 Method of manufacturing an electric discharge tube with a secondary emission electrode.

Country Status (1)

Country Link
CH (1) CH207928A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE755609C (en) * 1940-11-02 1954-04-22 Siemens & Halske A G Process for the production of the active layers on the impact electrodes of multiplier tubes by cathode atomization

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE755609C (en) * 1940-11-02 1954-04-22 Siemens & Halske A G Process for the production of the active layers on the impact electrodes of multiplier tubes by cathode atomization

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