DE739138C - Electron tubes with a cathode, the highly emissive coating of which is dusted onto the cathode body by eddy current heating - Google Patents

Electron tubes with a cathode, the highly emissive coating of which is dusted onto the cathode body by eddy current heating

Info

Publication number
DE739138C
DE739138C DER96083D DER0096083D DE739138C DE 739138 C DE739138 C DE 739138C DE R96083 D DER96083 D DE R96083D DE R0096083 D DER0096083 D DE R0096083D DE 739138 C DE739138 C DE 739138C
Authority
DE
Germany
Prior art keywords
cathode
eddy current
current heating
highly emissive
emissive coating
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
DER96083D
Other languages
German (de)
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.)
Loewe Opta GmbH
Original Assignee
Loewe Opta GmbH
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 Loewe Opta GmbH filed Critical Loewe Opta GmbH
Priority to DER96083D priority Critical patent/DE739138C/en
Application granted granted Critical
Publication of DE739138C publication Critical patent/DE739138C/en
Expired legal-status Critical Current

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
    • H01J9/04—Manufacture of electrodes or electrode systems of thermionic cathodes
    • H01J9/042—Manufacture, activation of the emissive part
    • H01J9/045—Activation of assembled cathode

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Electron Sources, Ion Sources (AREA)
  • Physical Vapour Deposition (AREA)

Description

Elektronenröhre mit einer Kathode, deren .hochemittierender Belag auf den Kathodenkörper durch Wirbelstromerhitzung aufgestäubt wird Bei Hochemissionsröhren, bei denen die Emission durch metallische Auflagen auf der Kathode von hochemittierenden Stoffen, beispielsweise-Barium, erzeugt wird, besteht die Gefahr, daß durch kurzzeitige Überheizung die hochemittierende und gewöhnlich leicht verdampfbare Metallauflage abgedampft und die Röhre in ihrer Wirksamkeit beeinträchtigt oder zerstört wird.Electron tube with a cathode, whose .hochemitting coating is sputtered onto the cathode body by eddy current heating. in which the emission through metallic coatings on the cathode of highly emissive Substances, for example barium, is generated, there is a risk that by short-term Overheating of the highly emissive and usually easily evaporable metal coating evaporated and the tube is impaired in its effectiveness or destroyed.

Es ist bekannt, den erwähnten Nachteil zu beseitigen, indem eine nachträgliche und mehrmalige Aufstäubung des hochemittierenden Stoffes in der fertigen Röhre ermöglicht wird.It is known to eliminate the disadvantage mentioned by a subsequent and allows multiple sputtering of the highly emissive substance in the finished tube will.

Gemäß der Erfindung werden zu diesem Zweck innerhalb der Röhre mehrere metallische tellerförmige Behälter vor passenden Aussparungen der Anode so im Winkel zueinänder angeordnet, daß durch Wirbelstromerhitzung der Teller bei geeigneter Anordnung des Wirbelstromfeldes jederzeit die eine oder andere Substanzmenge zur Verdampfung gebracht werden kann.According to the invention there are several within the tube for this purpose metallic plate-shaped container in front of matching recesses in the anode so at an angle arranged to each other that by eddy current heating of the plate with suitable Arrangement of the eddy current field at any time for one or the other amount of substance Evaporation can be brought about.

Statt in den verschiedenen Behältern die gleichen Stoffe unterzubringen, kann man in denselben auch verschiedene Stoffe anordnen. Ebenso gelingt es auf diese Weise, Gemische von verschiedenen emittierenden Substajizen zu erzeugen, deren Mischungsverhältnis durch das abwechselnde Glühen der einen oder anderen Substanzmenge beeinflußbar ist.Instead of accommodating the same substances in the different containers, you can also arrange different fabrics in them. It also works on this Way to create mixtures of different emitting substances, their mixing ratio can be influenced by the alternating glow of one or the other amount of substance is.

Zu dem gleichen Ziele führt es, wenn man Stoffe mit verschiedenen Verdampfungstemperaturen wählt, also beispielsweise auf einem Teller Barium, auf dem zweiten Strontium und auf einem dritten Kalzium befestigt.It leads to the same goal if one uses different substances Selects evaporation temperatures, for example barium on a plate the second strontium and attached to a third calcium.

Von besonderer Bedeutung ist die Erfindung, wenn die Stoffe aus reaktionsfähigen Gemischen, beispielsweise aus Barium-, Strontium- oder Kalziumoxyd mit Silizium, Aluminium, Magnesium o. dgl. bestehen.The invention is of particular importance when the substances are made of reactive Mixtures, for example of barium, strontium or calcium oxide with silicon, Aluminum, magnesium or the like. Are made.

Es ist bekannt, bei der ersten Herstellung der Röhre die auf einem Teller befestigte Substanz durch Wirbelstromerhitzung zu verdampfen und auf der Kathode niederzuschlagen. Die Erfindung ermöglicht es, auch späterhin wiederholt zu einem gewünschten Zeitpunkt die auf weiteren Tellern angeordneten Substanzen durch Wirbelstromerhitzung zur Verdampfung zu bringen.It is known when the tube is first manufactured on a Vaporize attached substance by eddy current heating and on the plate Knock down cathode. The invention makes it possible to repeat it later at a desired time the substances arranged on further plates to be brought to evaporation by eddy current heating.

Claims (1)

PATENTANSPRUCH: Elektronenröhre mit einer Kathode, deren hochemittierender Belag auf den Kathodenkörper durch Wirbelstromerhitzung aufgestäubt wird, dadurch gekennzeichnet, daß zur Ermöglichung einer nachträglichen Aufstäubung des hochemittierenden .Stoffes in der fertigen Röhre oder zur aufeinanderfolgenden Aufstäubung verschiedener emittierender Stoffe innerhalb der Röhre mehrere metallische tellerförmige Behälter zum Unterbringen der emittierenden Stoffe vor passenden Aussparungen der Anode so im Winkel zueinander angeordnet sind, daß bei geeigneter Stellung eines Wirbelstromfeldes die Behälter nacheinander auf die zur Reaktion oder Verdampfung der Substanzen erforderliche Temperatur gebracht werden. Zur Abgrenzung des Anmeldung sgegcnstandes vom Stand der Technik sind im Erteilungsverfahren in Betracht gezogen worden: deutsche Patentschrift ...... Nr. 338 625; französische - ...... - 6o4 195, 629 840; am,erikanis;che - ...... - i 628 987, 1 648 q,58. PATENT CLAIM: Electron tube with a cathode, the highly emissive coating of which is dusted onto the cathode body by eddy current heating, characterized in that, to enable subsequent dusting of the highly emissive The emitting substances are arranged at an angle to one another in front of suitable recesses in the anode so that, with a suitable position of an eddy current field, the containers are successively brought to the temperature required for the reaction or evaporation of the substances. To distinguish the subject of the application from the state of the art, the following were considered in the granting procedure: German patent specification ...... No. 338 625; French - ...... - 6o4 195, 629 840; am, erikanis; che - ...... - i 628 987, 1 648 q, 58.
DER96083D 1928-03-08 1928-03-08 Electron tubes with a cathode, the highly emissive coating of which is dusted onto the cathode body by eddy current heating Expired DE739138C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DER96083D DE739138C (en) 1928-03-08 1928-03-08 Electron tubes with a cathode, the highly emissive coating of which is dusted onto the cathode body by eddy current heating

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DER96083D DE739138C (en) 1928-03-08 1928-03-08 Electron tubes with a cathode, the highly emissive coating of which is dusted onto the cathode body by eddy current heating

Publications (1)

Publication Number Publication Date
DE739138C true DE739138C (en) 1943-09-14

Family

ID=7419497

Family Applications (1)

Application Number Title Priority Date Filing Date
DER96083D Expired DE739138C (en) 1928-03-08 1928-03-08 Electron tubes with a cathode, the highly emissive coating of which is dusted onto the cathode body by eddy current heating

Country Status (1)

Country Link
DE (1) DE739138C (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE338625C (en) * 1917-11-23 1921-06-28 Erich F Huth G M B H Dr Process for the production of glow cathodes
FR604195A (en) * 1924-06-05 1926-04-30 Thomson Houston Comp Francaise Improvements in the construction of electronic discharge tubes
US1628987A (en) * 1920-09-24 1927-05-17 Western Electric Co Thermionic device and method of evacuating the same
US1648458A (en) * 1926-08-27 1927-11-08 Gen Electric Electron-discharge device and method of operating the same
FR629840A (en) * 1926-03-06 1927-11-17 Thomson Houston Comp Francaise Improvements to electronic discharge tubes and means to avoid electrical leakage in these tubes

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE338625C (en) * 1917-11-23 1921-06-28 Erich F Huth G M B H Dr Process for the production of glow cathodes
US1628987A (en) * 1920-09-24 1927-05-17 Western Electric Co Thermionic device and method of evacuating the same
FR604195A (en) * 1924-06-05 1926-04-30 Thomson Houston Comp Francaise Improvements in the construction of electronic discharge tubes
FR629840A (en) * 1926-03-06 1927-11-17 Thomson Houston Comp Francaise Improvements to electronic discharge tubes and means to avoid electrical leakage in these tubes
US1648458A (en) * 1926-08-27 1927-11-08 Gen Electric Electron-discharge device and method of operating the same

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