AT77996B - Cathode ray tube with hot cathode for high current load on the surface. - Google Patents

Cathode ray tube with hot cathode for high current load on the surface.

Info

Publication number
AT77996B
AT77996B AT77996DA AT77996B AT 77996 B AT77996 B AT 77996B AT 77996D A AT77996D A AT 77996DA AT 77996 B AT77996 B AT 77996B
Authority
AT
Austria
Prior art keywords
cathode
ray tube
high current
current load
hot cathode
Prior art date
Application number
Other languages
German (de)
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
Application granted granted Critical
Publication of AT77996B publication Critical patent/AT77996B/en

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  • Electrodes For Cathode-Ray Tubes (AREA)

Description

  

   <Desc/Clms Page number 1> 
 



  Kathodenstrahlenröhre mit Glühkathode für hohe Strombelastung der Oberfläche. 



   Bei   Kathodenstrahlenröhren,   die auf der Wirkung einer   Glühkathode   beruhen, zeigt es sich, dass eine besonders rasche Zerstörung der Glühkathode in der Nähe des negativen Poles eintritt. Es hat sich nun gezeigt, dass diese Gefährdung des nach dem negativen Pol der lleizstromquelle zu gelegenen Teiles der   Glühkathode   dadurch vermieden werden kann, dass man entweder den Widerstand der Glühkathode pro   Längeneinheit   von dem negativen Pol nach dem positiven Pol hin   allmählich   grösser werden lässt oder dass man statt dessen oder gleichzeitig in Verbindung damit die Oberfläche der Glühkathode pro Längeneinheit nach dem positiven Pol der Heizstromquelle hin verkleinert.

   Man erzielt dadurch gleichzeitig die Wirkung, dass die Glühkathode in allen Teilen gleichmässig Elektronen abgibt. 



   Besonders für solche Kathodenstrahlenröhren kommt diese Anordnung in Betracht, bei denen mit einer sehr hohen Strombelastung für die   Obernacheneinheit   gerechnet werden muss, z. B. für Gleichrichter, die ausser der   glühelektriscben   Strömung noch wesentlich Glimmstrom benutzen. 

**WARNUNG** Ende DESC Feld kannt Anfang CLMS uberlappen**.



   <Desc / Clms Page number 1>
 



  Cathode ray tube with hot cathode for high current load on the surface.



   In the case of cathode ray tubes which are based on the action of a hot cathode, it has been shown that the hot cathode is destroyed particularly quickly in the vicinity of the negative pole. It has now been shown that this endangerment of the part of the hot cathode which is located after the negative pole of the electrical current source can be avoided by either increasing the resistance of the hot cathode per unit length from the negative pole to the positive pole, or that instead or at the same time in connection with this, the surface of the hot cathode per unit length is reduced towards the positive pole of the heating current source.

   This also has the effect that the hot cathode emits electrons evenly in all parts.



   This arrangement is particularly suitable for such cathode ray tubes in which a very high current load must be expected for the upper unit, e.g. B. for rectifiers, which, in addition to glowing electrical current, still use glowing current.

** WARNING ** End of DESC field may overlap beginning of CLMS **.

Claims (1)

PATENT-ANSPRUCH : Kathodenstrahlenröhre mit Glühkathode für hohe Strombelastung der Oberfläche, dadurch gekennzeichnet, dass die Oberfläche pro Längeneinheit von dem negativen nach dem positiven Pol der Heizstromquelle hin abnimmt oder der Widerstand pro Längeneinheit in derselben Richtung zunimmt. **WARNUNG** Ende CLMS Feld Kannt Anfang DESC uberlappen**. PATENT CLAIM: Cathode ray tube with hot cathode for high current load on the surface, characterized in that the surface per unit length decreases from the negative to the positive pole of the heating current source or the resistance per unit length increases in the same direction. ** WARNING ** End of CLMS field may overlap beginning of DESC **.
AT77996D 1915-03-18 1916-03-07 Cathode ray tube with hot cathode for high current load on the surface. AT77996B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE77996X 1915-03-18

Publications (1)

Publication Number Publication Date
AT77996B true AT77996B (en) 1919-08-25

Family

ID=5638047

Family Applications (1)

Application Number Title Priority Date Filing Date
AT77996D AT77996B (en) 1915-03-18 1916-03-07 Cathode ray tube with hot cathode for high current load on the surface.

Country Status (1)

Country Link
AT (1) AT77996B (en)

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