DE3500832A1 - Toroidal heating element - Google Patents

Toroidal heating element

Info

Publication number
DE3500832A1
DE3500832A1 DE19853500832 DE3500832A DE3500832A1 DE 3500832 A1 DE3500832 A1 DE 3500832A1 DE 19853500832 DE19853500832 DE 19853500832 DE 3500832 A DE3500832 A DE 3500832A DE 3500832 A1 DE3500832 A1 DE 3500832A1
Authority
DE
Germany
Prior art keywords
heating element
cathode
helix
element according
toroidal
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.)
Ceased
Application number
DE19853500832
Other languages
German (de)
Inventor
Frank Dr.phil. 7900 Ulm Bossert
Rolf Dr.Rer.Nat. 7901 Dornstadt Lotthammer
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.)
Licentia Patent Verwaltungs GmbH
Original Assignee
Licentia Patent Verwaltungs 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 Licentia Patent Verwaltungs GmbH filed Critical Licentia Patent Verwaltungs GmbH
Priority to DE19853500832 priority Critical patent/DE3500832A1/en
Publication of DE3500832A1 publication Critical patent/DE3500832A1/en
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
    • H01J1/02—Main electrodes
    • H01J1/13—Solid thermionic cathodes
    • H01J1/20—Cathodes heated indirectly by an electric current; Cathodes heated by electron or ion bombardment
    • H01J1/22—Heaters

Landscapes

  • Solid Thermionic Cathode (AREA)

Abstract

In order to compensate for the residual magnetic field of a toroidal heating element for a cathode of a cathode ray tube, it is proposed that one end of the heating wire be passed back in the interior of the toroid.

Description

l:3e 5 c hre ibungl: 3e 5 c hre ibung

Toroidförmiges Heizelement Die vorliegende Erfindung betrifft ein toroidförmiges Heizelement gemäß dem Oberbegriff des Patentanspruchs 1.Toroidal Heating Element The present invention relates to a toroidal heating element according to the preamble of claim 1.

Es ist bereits hekannt, daß ein magnetisches Streufeld des Heizelements einer indirekt geheizten Kathode für Elektronenröhren den von der Kathode emittierten Elektronenstrom in unerwünschter Weise beeinflussen, wie z. B. modulieren kann. Es ist weiter bekannt, dieser unerwünschten Brscheinung durch bifilar gewickelte Heizelemente, durch toroidförmige Heizelemente oder durch Gleichstromheizung entgegenzutreten.It is already known that a stray magnetic field from the heating element an indirectly heated cathode for electron tubes emitted by the cathode Affect electron flow in an undesirable manner, such as. B. can modulate. It is also known of this undesirable appearance by bifilar wound heating elements, by toroidal heating elements or by direct current heating to oppose.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, das an und für sich geringe Streufeld eines toroidförmigen Heizelements noch weiter zu verringern.The present invention is based on the object of and to reduce even further the low stray field of a toroidal heating element.

Diese Aufgabe wird durch die im Kennzeichen des Patentanspruchs l angegebenen Merkmale gelöst.This task is achieved by the characterizing part of claim l specified features solved.

Durch die beschriebene Ausbildung eines Heizelementes für Elektronenstrahlröhren wird auch das Restfeld eines Toroidheizers weitgehend direkt am Entstehungsort kompensiert, wie in dem in FIG. 3 gezeigten Diagramm dargestellt ist. Das Heizelement kann dadurch sehr dicht an die Emissionsfläche der Kathode herangebracht werden, wodurch die erforderliche Heizleistung verringert werden kann. Gegenüber mit Gleichspannung betriebenen Kathodenheizern wird infolge des Wegfalls von isolationsverschlecht emden Elektrolyseerscheinungen eine verbesserte Lebensdauer der Kathode ermöglicht. Diese Vorteile machen das beschriebene Heizelement besonders geeignet für Kathoden von Elektronenstrahlröhren, wie Lauffeldröhren und dgl. für Weltraumanwendung.Through the described design of a heating element for cathode ray tubes the residual field of a toroidal heater is largely compensated directly at the point of origin, as in the one shown in FIG. 3 is shown in the diagram. The heating element can thereby be brought very close to the emission surface of the cathode, whereby the required heating power can be reduced. Opposite with DC voltage operated cathode heaters is due to the omission of insulation deteriorated emden electrolysis phenomena enables an improved service life of the cathode. These advantages make the heating element described particularly suitable for cathodes of cathode ray tubes such as Lauffeld tubes and the like. For space use.

Anhand des in den FIG. l, 2 und 3 beschriebenen Ausführungsbeispiels wird die Erfindung näher erläutert.Based on the in FIGS. 1, 2 and 3 described embodiment the invention is explained in more detail.

Die FIG. 1 zeigt eine aufgeschnittene Seitenansicht und die FIG. 2 eine teilweise aufgeschnittene Aufsicht eines erfindungsgemäßen Toroidheizers für die Kathode einer Satellitenwanderfeldröhre. Der Toroidheizer l besteht aus einer zu einem Kreisring gebogenen Drahtwendel mit rechteckigem Querschnitt, wie aus der FIG. 1 ersichtlich. Das eine Ende 3 ist im Zentrum der Wendel und innerhalb dieser zurück- geführt, so daß die beiden kontaktierbaren Enden 2 und 3 des Heizers sich an dem einen Ende 4 der Wendel befinden. Durch die Zurückführung des einen Endes in der Wendel zum Wendelanfang wird auch das Restfeld des toroidförmigen Heizelements weitgehend kompensiert.The FIG. 1 shows a cut-away side view and FIG. 2 a partially cut-away plan view of a toroidal heater according to the invention for the cathode of a traveling satellite tube. The toroidal heater 1 consists of one Wire helix bent into a circular ring with a rectangular cross-section, as shown in FIG FIG. 1 can be seen. One end 3 is in the center of the helix and within it return- guided so that the two contactable ends 2 and 3 of the heater are located at one end 4 of the coil. By repatriation of one end in the helix at the beginning of the helix is also the residual field of the toroidal one Heating element largely compensated.

In FIG. 3 ist das magnetische Restfeld in A/m eines erfindungsgemäß ausgebildeten Kathodenheizers für eine Satellitenwanderfeldröhre über dem Abstand d in mm aufgetragen.In FIG. 3 is the residual magnetic field in A / m of one according to the invention trained cathode heater for a satellite traveling tube over the distance d plotted in mm.

Claims (7)

Patentansprüche 1. Toroidförmiges Heizelemen t mit einer Drahtwendel für eine indirekt geheizte Kathode einer Elektronenstrahlröhre, dadurcll gekennzeichnet, dalS das eitie Ende des gewendelten Drahtes im Innern der Wendel zurückgeführt ist.Claims 1. Toroidal Heizelemen t with a wire helix for an indirectly heated cathode of a cathode ray tube, marked dadurcll, that the first end of the coiled wire is led back inside the coil. 2. Heizelement nach Anspruch 1, dadurch gekennzeichnet, daß die Wendel rechteckigen Querschnitt aufweist.2. Heating element according to claim 1, characterized in that the helix Has a rectangular cross-section. 3. lleizelement nach Anspruch 1, dadurch gekennzeichnet, daß die Wendel kreisförmigen Querschnitt aufweist.3. lleizelement according to claim 1, characterized in that the helix Has circular cross-section. 4. Heizelement nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, 1 daß das aus der ringförmig gebogenen Wendel bestehende Toroid kreisförmigen Querschnitt aufweist.4. Heating element according to one of claims 1 to 3, characterized in that 1 that the toroid consisting of the annularly curved coil has a circular cross-section having. 5. Heizelement nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß das aus der ringförmig gebogenen Wendel bestehende Toroid einen mehreckigen , insbesondere rechteckigen Querschnitt aufweist.5. Heating element according to one of claims 1 to 3, characterized in that that the toroid consisting of the annularly curved coil is a polygonal one , in particular has a rectangular cross-section. G. Heizelement nach einem der Ansprüche 1 bis 5, (ladul-ch gekennzeichnet, daß das eine Drahtende im Zentrum der Wendel verlauferid zurückgeführt ist.G. Heating element according to one of claims 1 to 5, (Ladul-ch characterized, that one end of the wire in the center of the helix is traced back verlauferid. 7. Heizelement nach einem der Ansprüche 1 bis 6, gekennzeichnet durch die Verwendung in einer Kathode einer Lauffeldröhre.7. Heating element according to one of claims 1 to 6, characterized by the use in a cathode of a Lauffeldtube.
DE19853500832 1985-01-12 1985-01-12 Toroidal heating element Ceased DE3500832A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19853500832 DE3500832A1 (en) 1985-01-12 1985-01-12 Toroidal heating element

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19853500832 DE3500832A1 (en) 1985-01-12 1985-01-12 Toroidal heating element

Publications (1)

Publication Number Publication Date
DE3500832A1 true DE3500832A1 (en) 1986-07-24

Family

ID=6259674

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19853500832 Ceased DE3500832A1 (en) 1985-01-12 1985-01-12 Toroidal heating element

Country Status (1)

Country Link
DE (1) DE3500832A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10211947A1 (en) * 2002-03-18 2003-10-16 Siemens Ag Thermionic emitter, especially for x-ray tubes, has magnetic field compensation arrangement with current generating magnetic field that substantially compensates field generated by heating current

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1181825B (en) * 1961-11-29 1964-11-19 Varian Associates Indirectly heated surface cathode for electron tubes
US3223876A (en) * 1962-09-06 1965-12-14 Sfd Lab Inc Cathode heater assembly for use in strong d.c. magnetic fields
US3392300A (en) * 1964-11-12 1968-07-09 Thomson Houston Comp Francaise Hollow-beam electron gun with a control electrode

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1181825B (en) * 1961-11-29 1964-11-19 Varian Associates Indirectly heated surface cathode for electron tubes
US3223876A (en) * 1962-09-06 1965-12-14 Sfd Lab Inc Cathode heater assembly for use in strong d.c. magnetic fields
US3392300A (en) * 1964-11-12 1968-07-09 Thomson Houston Comp Francaise Hollow-beam electron gun with a control electrode

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10211947A1 (en) * 2002-03-18 2003-10-16 Siemens Ag Thermionic emitter, especially for x-ray tubes, has magnetic field compensation arrangement with current generating magnetic field that substantially compensates field generated by heating current

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Legal Events

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8110 Request for examination paragraph 44
8131 Rejection