DE700567C - Discharge tubes with liquid cathode and ignition by a semiconducting resistance pin that is permanently immersed in the cathode - Google Patents

Discharge tubes with liquid cathode and ignition by a semiconducting resistance pin that is permanently immersed in the cathode

Info

Publication number
DE700567C
DE700567C DE1937P0075437 DEP0075437D DE700567C DE 700567 C DE700567 C DE 700567C DE 1937P0075437 DE1937P0075437 DE 1937P0075437 DE P0075437 D DEP0075437 D DE P0075437D DE 700567 C DE700567 C DE 700567C
Authority
DE
Germany
Prior art keywords
cathode
ignition
resistance pin
discharge tubes
liquid
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
DE1937P0075437
Other languages
German (de)
Inventor
Dr Wilhelm Klose
Dr Wilfried Meyer
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.)
Osram GmbH
Original Assignee
Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
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 Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH filed Critical Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
Priority to DE1937P0075437 priority Critical patent/DE700567C/en
Application granted granted Critical
Publication of DE700567C publication Critical patent/DE700567C/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J13/00—Discharge tubes with liquid-pool cathodes, e.g. metal-vapour rectifying tubes
    • H01J13/02—Details
    • H01J13/34—Igniting arrangements
    • H01J13/36—Igniting arrangements having resistive or capacitative igniter
    • H01J13/38—Igniting arrangements having resistive or capacitative igniter having resistive igniter only

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Cold Cathode And The Manufacture (AREA)

Description

Entladungsröhre mit flüssiger Kathode und Zündung durch einen in die Kathode ' dauernd eintauchenden halbleitenden Widerstandsstift Zum Zünden elektrischer - Entladungsgefäße mit flüssiger Kathode, die insbesondere als Leuchtröhren und Gleichrichter verwendet werden können, kann man sich eines in die Kathode dauernd eintauchenden halbleitenden Widerstandsstiftes bedienen. Dieser Widerstandsstift besteht dabei meist aus kohlenstoffhaltigen Halbleiterverbindungen, beispielsweise aus Siliciumcarbid. Die Anordnung arbeitet in der Weise, daß bei einem Spannungsunterschied zwischen dem Widerstandsstift und der Kathode durch die Grenzfläche ein Strom hindurchgeht, der die Hauptentladung zündet. Diese Anordnungen arbeiten nicht immer zufriedenstellend. Insbesondere ist es bekannt, daß sämtliche bisher zur Verwendung kommenden Zündstifte unter Umständen ganz erhebliche Temperaturen annehmen, was zu ständig steigendem Zündstrom Anlaß gibt, da diese Stifte einen negativen Temperaturkoeffizienten des elektrischen Widerstandes besitzen.Discharge tube with liquid cathode and ignition by one in the Cathode 'permanently immersing semiconducting resistance pin for igniting electrical - Discharge vessels with a liquid cathode, in particular as fluorescent tubes and Rectifiers can be used, one can be put into the cathode permanently operate the immersing semiconducting resistance pin. This resistance pen consists mostly of carbon-containing semiconductor compounds, for example made of silicon carbide. The arrangement operates in such a way that when there is a voltage difference a current passes through the interface between the resistance pin and the cathode, which ignites the main discharge. These arrangements do not always work satisfactorily. In particular, it is known that all ignition pins that have hitherto been used under certain circumstances take on very considerable temperatures, which leads to constantly increasing Ignition current gives rise to, because these pins have a negative temperature coefficient of the have electrical resistance.

Nach der Erfindung wird- die Zündungsvorrichtung dadurch verbessert, daß an Stelle der üblichen Widerstandskörper ein Widerstandskörper aus einer Perowskitstruktur aufweisenden Verbindung von Titandioxyd mit Calciumoxyd, Strontiumoxyd oder Bariumoxyd, deren Sauerstoffgehalt etwas geringer ist, als es der stöchiometrischen Zusammensetzung entspricht, verwendet wird. Die genannten Widerstandsstoffe zeichnen sich durch eine für leitende Halbleiterwerkstoffe ungewöhnlich :hohe Elektronenemission und durch einen positiven Temperaturkoeffizienten des elektrischen Widerstandes aus.. Beide Eigenschaften bringen bei Entladungsgefäßen mit flüssiger Kathode einen beachtenswerten Fortschritt. Durch die gute Elektronenemission wird die Zündung sicherer, und der positive Temperaturkoeffizient begrenzt den Strom ohne besonderen Vorschaltwiderstand.According to the invention, the ignition device is improved by that instead of the usual resistance body, a resistance body made of a perovskite structure containing compound of titanium dioxide with calcium oxide, strontium oxide or barium oxide, whose oxygen content is somewhat lower than the stoichiometric composition is used. Draw the mentioned resistance materials themselves due to what is unusual for conductive semiconductor materials: high electron emission and by a positive temperature coefficient of the electrical resistance off .. Both properties are beneficial for discharge vessels with a liquid cathode remarkable progress. The ignition is due to the good electron emission safer, and the positive temperature coefficient limits the current without special Series resistor.

Die Widerstandskörper nach der Erfindung sind einphasige Körper, die aus einem Gemisch der Oxyde durch reduzierendes Brennen gewonnen werden. Wenn man vor dem reduzierenden Brennen zum Erzielen einer feineren Verteilung erst oxydierend brennen will, so muß man die Temperatur so niedrig halten, daß die Bildung einer Spinellstruktur vermieden wird.The resistance bodies according to the invention are single-phase bodies that obtained from a mixture of oxides by reducing firing. If before the reducing firing, first oxidizing to achieve a finer distribution want to burn, the temperature must be kept so low that the formation of a Spinel structure is avoided.

Claims (1)

PATENTANSPRUCH: Entladungsröhre mit flüssiger Kathode und Zündung durch einen dauernd in die Kathode eintauchenden halbleitenden Widerstandsstift, dadurch gekennzeichnet, daß der Widerstandsstift aus einer Perowskitstruktur aufweisenden Verbindung von Titandioxyd mit Calciumoxyd, Strontiumoxyd oder Bariumoxyd besteht, die weniger Sauerstoff besitzt als der stöchiometrischen Zusammensetzung entspricht.PATENT CLAIM: Discharge tube with liquid cathode and ignition by means of a semiconducting resistance pin that is permanently immersed in the cathode, characterized in that the resistance pin is made of a perovskite structure There is a combination of titanium dioxide with calcium oxide, strontium oxide or barium oxide, which has less oxygen than corresponds to the stoichiometric composition.
DE1937P0075437 1937-06-26 1937-06-26 Discharge tubes with liquid cathode and ignition by a semiconducting resistance pin that is permanently immersed in the cathode Expired DE700567C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE1937P0075437 DE700567C (en) 1937-06-26 1937-06-26 Discharge tubes with liquid cathode and ignition by a semiconducting resistance pin that is permanently immersed in the cathode

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1937P0075437 DE700567C (en) 1937-06-26 1937-06-26 Discharge tubes with liquid cathode and ignition by a semiconducting resistance pin that is permanently immersed in the cathode

Publications (1)

Publication Number Publication Date
DE700567C true DE700567C (en) 1940-12-23

Family

ID=7392761

Family Applications (1)

Application Number Title Priority Date Filing Date
DE1937P0075437 Expired DE700567C (en) 1937-06-26 1937-06-26 Discharge tubes with liquid cathode and ignition by a semiconducting resistance pin that is permanently immersed in the cathode

Country Status (1)

Country Link
DE (1) DE700567C (en)

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