EP0101108B1 - Electronic tube, particularly an emitter tube - Google Patents

Electronic tube, particularly an emitter tube Download PDF

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Publication number
EP0101108B1
EP0101108B1 EP83201027A EP83201027A EP0101108B1 EP 0101108 B1 EP0101108 B1 EP 0101108B1 EP 83201027 A EP83201027 A EP 83201027A EP 83201027 A EP83201027 A EP 83201027A EP 0101108 B1 EP0101108 B1 EP 0101108B1
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EP
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Prior art keywords
cathode
wires
cathode wires
valve according
joining
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EP83201027A
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German (de)
French (fr)
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EP0101108A1 (en
Inventor
Hans Holenstein
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BBC Brown Boveri AG Switzerland
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BBC Brown Boveri AG Switzerland
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    • 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
    • H01J1/15—Cathodes heated directly by an electric current
    • H01J1/16—Cathodes heated directly by an electric current characterised by the shape

Definitions

  • the invention relates to an electron tube, in particular a transmitter tube, according to the preamble of patent claim 1.
  • the invention relates to a prior art of electron tubes as described in Patents Abstracts of Japan, Volume 2, No. 29, February 23, 1978, p. 12106 (E 77) first summary, J PA-52 149 958 is known.
  • cathode wires are wound spirally on a circular cylindrical surface with a constant pitch between an upper power supply plate and a lower power supply ring. Around this circular cylindrical surface 3 bands are connected to the cathode wires in parallel and at a distance from one another. If the cathode wires are heated, barrel-shaped bulges can be avoided at the location of the strips, but not in the intermediate area.
  • cathode wires running parallel to the tube axis which are attached on the one hand to a rigid, lower connection ring and, on the other hand, connected to an upper connection ring that is prestressed by a central spring.
  • the wires are kept under tension by the spring via the connection ring, so that their change in length in the direction of the tube axis is absorbed and compensated.
  • the upper power supply is via a flexible supply in the form of a metal bellows.
  • the flexible and spring-loaded design of the upper connection ring requires a considerable amount of extra work in the manufacture of the tube.
  • the invention solves the problem of creating a cathode in which the influence of the thermal expansion of the cathode wires is eliminated in a simple manner and without a flexible connection.
  • the cathode wires have the shape of a lying, symmetrical V and are connected to the connection rings at precisely superimposed points.
  • the cathode according to the invention shown in FIG. 1 is constructed mechanically from an upper power supply 2 and a lower power supply 1, which are arranged as concentric tubes in the interior of the cathode.
  • an upper connection plate 4 and a lower connection plate 3 are attached, which merge into connection rings 7 and 8 on their outer edge.
  • cathode wires 5 lie on the cylindrical outer surface delimited by the connection rings, the ends of which are connected in a mechanically rigid and electrically conductive manner at connection points 9 to the corresponding connection rings.
  • the cathode wires 5 are rigidly connected to one another in the tip of the V by a retaining ring 6, the diameter of which is adapted to the diameters of the connecting rings 7 and 8 such that the connected cathode wires 5 a cylinder jacket with a constant diameter. form.
  • connection rings 7 and 8 consist of an electrically highly conductive material which at the same time has sufficient mechanical strength to absorb the thermally induced forces that occur during operation.
  • connection plates 7 and 8 which are strongly heated at least in the outer areas by the glowing cathode wires, are advantageously made of a high-melting metal, such as. B. molybdenum.
  • connection rings on the one hand, and the cathode wires and the retaining ring on the other.
  • these connections are produced by a suitable welding process, that is to say spot-welded, for example.
  • spot-welded for example.
  • the materials from which the parts to be joined are selected from the point of view of weldability.
  • the cathode wires 5 are preferably made of thoriated tungsten, it is from Advantage to provide a retaining ring 6 made of tungsten.
  • the behavior of the cathode wires of a cathode according to the invention during heating is shown in FIG. 2 using the example of two wires.
  • the cathode wires 5 lie on the cylindrical outer surface 11 already described between the connection rings 7 and 8. If the cathode wires are brought to emission temperature during operation, their length increases due to the thermal expansion. Since the end points of the wires are fixed in their position on the rigid connection rings, the change in length is absorbed by a displacement of the wires in the area between the connection rings.
  • the shape of the cathode wires according to the invention ensures that this displacement runs in a preferred direction, which is predetermined by the tip of the V in the V-shaped wires of the exemplary embodiment shown in FIG. that is, the tip of the V shifts in the central plane 12 for reasons of symmetry.
  • the cathode wires 5 then assume the position shown in dashed lines, the retaining ring only being twisted around the cathode axis compared to the cold state.
  • the stability of the cathode cylinder jacket can be further improved if the cylinder jacket is connected at least in the central plane 12 to a rotatable centering, which can be fastened, for example, to the lower power supply 2 and certainly prevents lateral displacements of the cylinder jacket in the central plane Rotating displacements around the tube axis, as they occur when the cathode according to the invention is heated.
  • the cathode according to the invention it is achieved in a simple manner that the cylinder jacket formed by the cathode wires maintains both its length and its constant diameter, regardless of whether the cathode wires are cold or at emission temperature.
  • the upper termination 15 is rigidly connected, for example, to the upper connection plate 4 of the cathode via a connecting element 16, so that the position of the grid and cathode wires is fixed relative to one another.
  • This structure of the grid according to the invention achieves on the one hand a largely uniform field distribution in the tube and on the other hand an increased accuracy in the electrode spacings.
  • an electron tube according to the invention has a stable electrode configuration that can be produced with good accuracy and thus also a stable operating behavior. This is achieved through very simple and effective design measures, which are characterized by increased economic efficiency in production compared to other technical solutions.

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  • Electrodes For Cathode-Ray Tubes (AREA)
  • Solid Thermionic Cathode (AREA)
  • Microwave Tubes (AREA)

Description

Die Erfindung betrifft eine Elektronenröhre, insbesondere Senderöhre, nach dem Oberbegriff des Patentanspruchs 1.The invention relates to an electron tube, in particular a transmitter tube, according to the preamble of patent claim 1.

Mit dem Oberbegriff nimmt die Erfindung auf einen Stand der Technik von Elektronenröhren Bezug, wie er durch Patents Abstracts of Japan, Band 2, Nr. 29, 23.2.1978, S. 12106 (E 77) erste Zusammenfassung, JP-A-52 149 958 bekannt ist. Dort sind bei einer Magnetron-Kathode zwischen einem oberen Stromzufuhrteller und einem unteren Stromzufuhrring Kathodendrähte auf einer kreiszylindrischen Fläche spiralförmig mit konstanter Steigung aufgewickelt. Um diese kreiszylindrische Fläche sind parallel und im Abstand zueinander 3 Bänder mit den Kathodendrähten verbunden. Bei einer Erwärmung der Kathodendrähte können am Ort der Bänder tonnenförmige Ausbeulungen vermieden werden, nicht aber im Zwischenbereich.With the preamble, the invention relates to a prior art of electron tubes as described in Patents Abstracts of Japan, Volume 2, No. 29, February 23, 1978, p. 12106 (E 77) first summary, J PA-52 149 958 is known. In the case of a magnetron cathode, cathode wires are wound spirally on a circular cylindrical surface with a constant pitch between an upper power supply plate and a lower power supply ring. Around this circular cylindrical surface 3 bands are connected to the cathode wires in parallel and at a distance from one another. If the cathode wires are heated, barrel-shaped bulges can be avoided at the location of the strips, but not in the intermediate area.

Bei einem Abstand des nächstliegenden Steuergitters zur Kathode von nur wenigen Millimetern verändert sich infolge der Ausbeulung das Betriebsverhalten der Röhre erheblich.At a distance of only a few millimeters from the closest control grid to the cathode, the operating behavior of the tube changes considerably as a result of the bulge.

Um den Einfluss der thermischen Ausdehnung der Kathode auf das Betriebsverhalten zu verringern, wurde eine weitere Kathodenart entwickelt, die als Reusenkathode bekannt ist. Sie zeichnet sich durch parallel zur Röhrenachse verlaufende Kathodendrähte aus, die einerseits an einem starren, unteren Anschlussring befestigt und andererseits mit einem oberen, durch eine Zentralfeder vorgespannten Anschlussring verbunden sind. Die Drähte werden durch die Feder über den Anschlussring unter Spannung gehalten, so dass ihre Längenänderung in Richtung der Röhrenachse aufgefangen und ausgeglichen wird. Die obere Stromzuführung erfolgt über eine flexible Zuleitung in Form eines Metallbalges. Die bewegliche und gefederte Ausführung des oberen Anschlussringes erfordert einen erheblichen Mehraufwand bei der Herstellung der Röhre.In order to reduce the influence of the thermal expansion of the cathode on the operating behavior, a further type of cathode was developed, which is known as a trap cathode. It is characterized by cathode wires running parallel to the tube axis, which are attached on the one hand to a rigid, lower connection ring and, on the other hand, connected to an upper connection ring that is prestressed by a central spring. The wires are kept under tension by the spring via the connection ring, so that their change in length in the direction of the tube axis is absorbed and compensated. The upper power supply is via a flexible supply in the form of a metal bellows. The flexible and spring-loaded design of the upper connection ring requires a considerable amount of extra work in the manufacture of the tube.

Die Erfindung, wie sie im Patentanspruch 1 definiert ist, löst die Aufgabe, eine Kathode zu schaffen, bei der der Einfluss der thermischen Ausdehnung der Kathodendrähte in einfacher Weise und ohne flexible Verbindung eliminiert wird.The invention, as defined in claim 1, solves the problem of creating a cathode in which the influence of the thermal expansion of the cathode wires is eliminated in a simple manner and without a flexible connection.

Gemäss einem bevorzugten Ausführungsbeispiel haben die Kathodendrähte die Form eines liegenden, symmetrischen V und sind an genau übereinanderliegenden Punkten mit den Anschlussringen verbunden.According to a preferred exemplary embodiment, the cathode wires have the shape of a lying, symmetrical V and are connected to the connection rings at precisely superimposed points.

Die Erfindung wird nachfolgend anhand der Zeichnung erläutert.The invention is explained below with reference to the drawing.

Es zeigen :

  • Figur 1 Ein bevorzugtes Ausführungsbeispiel der erfindungsgemässen Kathode mit V-förmigen Kathodendrähten.
  • Figur 2 Das Verhalten der Kathodendrähte einer erfindungsgemässen Kathode beim Aufheizen.
Show it :
  • Figure 1 A preferred embodiment of the cathode according to the invention with V-shaped cathode wires.
  • Figure 2 The behavior of the cathode wires of a cathode according to the invention during heating.

Die in Fig. 1 dargestellte, erfindungsgemässe Kathode ist mechanisch aus einer oberen Stromzuführung 2 und einer unteren Stromzuführung 1 aufgebaut, die als konzentrische Rohre im Inneren der Kathode angeordnet sind. An den oberen Enden der Rohre sind jeweils ein oberer Anschlussteller 4 und ein unterer Anschlussteller 3 angebracht, die an ihrem Aussenrand in Anschlussringe 7 und 8 übergehen. Zwischen dem oberen Anschlussring 8 und dem unteren Anschlussring 7 liegen auf der von den Anschlussringen begrenzten, zylindrischen Mantelfläche Kathodendrähte 5, deren Enden in Verbindungspunkten 9 mit den entsprechenden Anschlussringen mechanisch starr und elektrisch leitend verbunden sind.The cathode according to the invention shown in FIG. 1 is constructed mechanically from an upper power supply 2 and a lower power supply 1, which are arranged as concentric tubes in the interior of the cathode. At the upper ends of the tubes, an upper connection plate 4 and a lower connection plate 3 are attached, which merge into connection rings 7 and 8 on their outer edge. Between the upper connection ring 8 and the lower connection ring 7, cathode wires 5 lie on the cylindrical outer surface delimited by the connection rings, the ends of which are connected in a mechanically rigid and electrically conductive manner at connection points 9 to the corresponding connection rings.

Die Kathodendrähte 5, von denen der Uebersichtlichkeit wegen in Fig. 1 nur einige wenige dargestellt sind, bilden Mantellinien auf der Zylinderfläche, die, am unteren Anschlussring 7 beginnend, mit einer konstanten, positiven Steigung bis zur Mittelebene 12 zwischen den Anschlussringen 7 und 8, und von dort mit einer konstanten negativen Steigung bis zum oberen Anschlussring 8 verlaufen. Sie haben demnach bei diesem bevorzugten Ausführungsbeispiel die Form eines symmetrischen, liegenden V. Die Kathodendrähte 5 sind untereinander in der Spitze des V durch einen Haltering 6 starr verbunden, dessen Durchmesser den Durchmessern der Anschlussringe 7 und 8 so angepasst ist, dass die verbundenen Kathodendrähte 5 einen Zylindermantel mit konstantem Durchmesser. bilden.The cathode wires 5, of which only a few are shown in FIG. 1 for the sake of clarity, form surface lines on the cylinder surface which, starting at the lower connecting ring 7, have a constant, positive slope up to the central plane 12 between the connecting rings 7 and 8, and from there with a constant negative slope to the upper connection ring 8. Accordingly, in this preferred exemplary embodiment they have the shape of a symmetrical, lying V. The cathode wires 5 are rigidly connected to one another in the tip of the V by a retaining ring 6, the diameter of which is adapted to the diameters of the connecting rings 7 and 8 such that the connected cathode wires 5 a cylinder jacket with a constant diameter. form.

Der Heizstrom für die Kathodendrähte wird über die Stromzuführungen 1 und 2 und die Anschlussteller 3 und 4 in die Anschlussringe 7 und 8 eingespeist. Es versteht sich daher von selbst, dass diese Teile aus einem elektrisch gut leitenden Material bestehen, das zugleich eine ausreichende mechanische Festigkeit besitzt, um die während des Betriebes auftretenden, thermisch bedingten Kräfte aufzunehmen. Darüber hinaus werden die Anschlussteller 7 und 8, die zumindest in den äusseren Bereichen durch die glühenden Kathodendrähte stark erhitzt werden, vorteilhafterweise aus einem hochschmelzenden Metall, wie z. B. Molybdän, gefertigt.The heating current for the cathode wires is fed into the connection rings 7 and 8 via the current leads 1 and 2 and the connection plates 3 and 4. It therefore goes without saying that these parts consist of an electrically highly conductive material which at the same time has sufficient mechanical strength to absorb the thermally induced forces that occur during operation. In addition, the connection plates 7 and 8, which are strongly heated at least in the outer areas by the glowing cathode wires, are advantageously made of a high-melting metal, such as. B. molybdenum.

Besondere Beachtung muss auch den thermisch und mechanisch belasteten Verbindungen zwischen den Kathodendrähten und den Anschlussringen einerseits, sowie den Kathodendrähten und dem Haltering andererseits geschenkt werden. Gemäss einem bevorzugten Ausführungsbeispiel werden diese Verbindungen durch ein geeignetes Schweissverfahren hergestellt, also bespielsweise punktgeschweisst. Dazu ist erforderlich, dass die Materialien aus denen die zu verbindenden Teile bestehen, unter dem Gesichtspunkt der Schweissbarkeit ausgewählt sind. Da die Kathodendrähte 5 vorzugsweise aus thoriertem Wolfram gefertigt sind, ist es von Vorteil, einen Haltering 6 aus Wolfram vorzusehen.Special attention must also be paid to the thermally and mechanically stressed connections between the cathode wires and the connection rings on the one hand, and the cathode wires and the retaining ring on the other. According to a preferred embodiment, these connections are produced by a suitable welding process, that is to say spot-welded, for example. For this it is necessary that the materials from which the parts to be joined are selected from the point of view of weldability. Since the cathode wires 5 are preferably made of thoriated tungsten, it is from Advantage to provide a retaining ring 6 made of tungsten.

Das Verhalten der Kathodendrähte einer erfindungsgemässen Kathode beim Aufheizen ist am Beispiel zweier Drähte in Fig. 2 dargestellt. Im kalten Zustand liegen die Kathoderidrähte 5 auf der bereits beschriebenen zylindrischen Mantelfläche 11 zwischen den Anschlussringen 7 und 8. Werden die Kathodendrähte während des Betriebes auf Emissionstemperatur gebracht, vergrössert sich ihre Länge aufgrund der thermischen Ausdehnung. Da die Endpunkte der Drähte auf den starren Anschlussringen in ihrer Lage fixiert sind, wird die Längenänderung durch eine Verschiebung der Drähte im Bereich zwischen den Anschlussringen aufgefangen. Durch die erfindungsgemässe Formgebung der Kathodendrähte wird erreicht, dass diese Verschiebung in einer Vorzugsrichtung verläuft, die bei den V-förmigen Drähten des in Fig. 1 gezeigten Ausführungsbeispiels durch die Spitze des V vorgegeben ist, d. h., die Spitze des V verschiebt sich aus Symmetriegründen in der Mittelebene 12.The behavior of the cathode wires of a cathode according to the invention during heating is shown in FIG. 2 using the example of two wires. In the cold state, the cathode wires 5 lie on the cylindrical outer surface 11 already described between the connection rings 7 and 8. If the cathode wires are brought to emission temperature during operation, their length increases due to the thermal expansion. Since the end points of the wires are fixed in their position on the rigid connection rings, the change in length is absorbed by a displacement of the wires in the area between the connection rings. The shape of the cathode wires according to the invention ensures that this displacement runs in a preferred direction, which is predetermined by the tip of the V in the V-shaped wires of the exemplary embodiment shown in FIG. that is, the tip of the V shifts in the central plane 12 for reasons of symmetry.

Der Haltering 6, der eine starre Kopplung zwischen den Kathodendrähten herstellt, gegenüber den Anschlussringen 7 und 8 dagegen frei beweglich ist, bewirkt, dass die Verschiebung auf der zylindrischen Mantelfläche 11 erfolgt. Die Kathodendrähte 5 nehmen dann die gestrichelt eingezeichnete Lage ein, wobei der Haltering gegenüber dem kalten Zustand lediglich eine Verdrehung um die Kathodenachse erfährt.The retaining ring 6, which produces a rigid coupling between the cathode wires, but is freely movable relative to the connecting rings 7 and 8, causes the displacement to take place on the cylindrical outer surface 11. The cathode wires 5 then assume the position shown in dashed lines, the retaining ring only being twisted around the cathode axis compared to the cold state.

Um die Stabilität des von den Kathodendrähten 5 gebildeten Zylindermantels zu erhöhen, ist es weiterhin vorteilhaft, über den in der Mittelebene 12 liegenden Haltering 6 hinaus weitere Halteringe vorzusehen, die in gleichmässigen Abständen voneinander zwischen den Anschlussringen 7 und 8 angeordnet und mit den Kathodendrähten 5 verbunden sind.In order to increase the stability of the cylinder jacket formed by the cathode wires 5, it is furthermore advantageous to provide further retaining rings beyond the retaining ring 6 lying in the central plane 12, which are arranged at equal distances from one another between the connecting rings 7 and 8 and connected to the cathode wires 5 are.

Insbesondere kann die Stabilität des Kathoden-Zylindermantels weiter verbessert werden, wenn der Zylindermantel wenigstens in der Mittelebene 12 mit einer drehbaren Zentrierung verbunden ist, die beispielsweise an der unteren Stromzuführung 2 befestigt sein kann und mit Sicherheit seitliche Verschiebungen des Zylindermantels in der Mittelebene verhindert, dagegen rotierende Verschiebungen um die Röhrenachse, wie sie bei der Erwärmung der erfindungsgemässen Kathode auftreten, zulässt.In particular, the stability of the cathode cylinder jacket can be further improved if the cylinder jacket is connected at least in the central plane 12 to a rotatable centering, which can be fastened, for example, to the lower power supply 2 and certainly prevents lateral displacements of the cylinder jacket in the central plane Rotating displacements around the tube axis, as they occur when the cathode according to the invention is heated.

Insgesamt wird bei der erfindungsgemässen Kathode auf einfache Weise erreicht, dass der von den Kathodendrähten gebildete Zylindermantel sowohl seine Länge, als auch seinen konstanten Durchmesser beibehält, unabhängig davon, ob die Kathodendrähte kalt oder auf Emissionstemperatur sind.Overall, in the cathode according to the invention it is achieved in a simple manner that the cylinder jacket formed by the cathode wires maintains both its length and its constant diameter, regardless of whether the cathode wires are cold or at emission temperature.

Aufgrund der speziellen Formgebung der Kathodendrähte bei der erfindungsgemässen Kathode ist es von Vorteil, in der Elektronenröhre vorkommende Steuer- oder Abschirmgitter in einer an die Kathode angepassten Weise auszuführen. Dies wird am Beispiel eines in Fig. 1 dargestellten Gitters 13 deutlich, das zwischen einem unteren, konzentrisch zur Kathode angeordneten Zuführungsrohr und einem oberen Abschluss 15 parallel laufende Gitterdrähte 14 aufweist, die auf einer zylindrischen Mantelfläche um die Kathode liegen und eine den Kathodendrähten 5 entsprechende Form besitzen. Die Gitter- und Kathodendrähte sind alternierend angebracht, d. h. die Gitterdrähte 14 liegen zwischen den Kathodendrähten 5 und umgekehrt. Der obere Abschluss 15 ist über ein Verbindungselement 16 beispielsweise mit dem oberen Anschlussteller 4 der Kathode starr verbunden, so dass die Lage der Gitter- und Kathodendrähte relativ zueinander fixiert ist. Dadurch entfällt die bei den Röhren nach dem Stand der Technik notwendige Führung für das eine, frei bewegliche Gitterende, die aufgrund des erforderlichen, mechanischen Spiels Abstandsunterschiede zwischen den Elektroden in der Grössenordnung von 10% verursachen kann.Because of the special shape of the cathode wires in the cathode according to the invention, it is advantageous to design control or shielding grids occurring in the electron tube in a manner adapted to the cathode. This is clear from the example of a grid 13 shown in FIG. 1, which has grid wires 14 running parallel between a lower feed tube arranged concentrically to the cathode and an upper termination 15, which lie on a cylindrical outer surface around the cathode and one corresponding to the cathode wires 5 To have shape. The grid and cathode wires are alternately attached, i. H. the grid wires 14 lie between the cathode wires 5 and vice versa. The upper termination 15 is rigidly connected, for example, to the upper connection plate 4 of the cathode via a connecting element 16, so that the position of the grid and cathode wires is fixed relative to one another. This eliminates the need for the guide according to the prior art for the one, freely movable grille end, which due to the required mechanical play can cause differences in distance between the electrodes of the order of 10%.

Durch diesen erfindungsgemässen Aufbau des Gitters wird einerseits eine weitgehend gleichmässige Feldverteilung in der Röhre sowie andererseits eine erhöhte Genauigkeit bei den Elektrodenabständen erreicht.This structure of the grid according to the invention achieves on the one hand a largely uniform field distribution in the tube and on the other hand an increased accuracy in the electrode spacings.

Darüber hinaus ist es von besonderem Vorteil, die Steigungsänderung der Kathodendrähte, wie sie nach Fig. 2 beim Erwärmen auf Betriebstemperatur auftritt, gegenüber den Gitterdrähten dadurch zu kompensieren, dass man für die Kathodendrähte im kalten Zustand eine entsprechend höhere Steigung so wählt, dass diese Steigungsdifferenz durch die thermische Ausdehnung der Kathodendrähte im Betrieb aufgehoben wird.In addition, it is particularly advantageous to compensate for the change in slope of the cathode wires, as occurs in FIG. 2 when heating to operating temperature, compared to the grid wires, by choosing a correspondingly higher slope for the cathode wires in the cold state so that this slope difference is canceled by the thermal expansion of the cathode wires during operation.

Dadurch ist gewährleistet, dass die Gitter- und Kathodendrähte während des Betriebes der Röhre parallel verlaufen und Kreuzungen der Drähte sicher vermieden werden.This ensures that the grid and cathode wires run parallel during the operation of the tube and crossings of the wires are safely avoided.

Eine erfindungsgemässe Elektronenröhre weist gesamthaft eine stabile und mit guter Genauigkeit herstellbare Elektrodenkonfiguration und damit auch ein stabiles Betriebsverhalten auf. Dies wird erreicht durch sehr einfache und wirkungsvolle konstruktive Massnahmen, die sich gegenüber anderen technischen Lösungen durch eine erhöhte Wirtschaftlichkeit in der Herstellung auszeichnen.Overall, an electron tube according to the invention has a stable electrode configuration that can be produced with good accuracy and thus also a stable operating behavior. This is achieved through very simple and effective design measures, which are characterized by increased economic efficiency in production compared to other technical solutions.

Claims (8)

1. Electron valve, in particular transmitter valve,
a) with a coaxial electrode arrangement,
b) with electrical joining rings (7, 8) which lie one above the other and are connected to concentric power supplies (1, 2),
c) with a directly heated, cylindrical cathode between these joining rings,
d) the cathode having individual, mutually parallel running cathode wires (5) which form the cylinder casing,
e) the pitch of the cathode wires forming, at least in sections, an acute angle relative to the plane of a joining ring,
f) with at least one retaining ring (6) which is arranged between the joining rings (7, 8) and is connected to the cathode wires (5),

characterised in that
g) characterised in that the pitch of the cathode wires (5) between the joining rings (7, 8) changes the sign, and
h) at least one retaining ring (6) is rotatably connected to the cathode wires.
2. Electron valve according to Claim 1, characterized in that the cathode wires (5) are welded to the joining rings (7, 8).
3. Electron valve according to Claim 1 or 2, characterized in that the cathode wires (5) are welded to at least one retaining ring (6).
4. Electron valve according to one of Claims 1-3, characterized in that the cathode wires (5) run symmetrical to the mid-plane (12) between the joining rings (7, 8).
5. Electron valve according to Claim 4, characterized in that the cathode wires (5) run from the lower joining ring (7) to the mid-plane (12) at a first pitch and from the mid-plane (12) to the upper joining ring (8) at a second pitch, which is equal in degree to the first pitch but has an opposite sign.
6. Electron valve according to Claim 4 or 5, characterized in that a retaining ring (6) connects the cathode wires (5) in the mid-plane (12).
7. Electron valve according to one of Claims 1-6, characterized in that
a) the cathode is concentrically surrounded by a cylindrical grid (13) of grid wires (14),
b) which run parallel to the cathode wires (5) if the cathode is at operating temperature, and
c) an upper termination (15) of the grid (13) is rigidly connected to the cathode.
8. Electron valve according to Claim 7, characterized in that each of the grid wires (14) is arranged between two neighbouring cathode wires (5).
EP83201027A 1982-07-27 1983-07-12 Electronic tube, particularly an emitter tube Expired EP0101108B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH455482 1982-07-27
CH4554/82 1982-07-27

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EP0101108A1 EP0101108A1 (en) 1984-02-22
EP0101108B1 true EP0101108B1 (en) 1987-01-21

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US (1) US4546286A (en)
EP (1) EP0101108B1 (en)
JP (1) JPS5971233A (en)
DE (1) DE3369423D1 (en)

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GB2214705A (en) * 1988-01-26 1989-09-06 English Electric Valve Co Ltd Directly heated cathode
FR2662020B1 (en) * 1990-05-11 1996-04-19 Thomson Tubes Electroniques ELECTRONIC TUBE WITH CYLINDRICAL GRID.

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US2398609A (en) * 1941-09-27 1946-04-16 Westinghouse Electric Corp Electrode and means and method of making the same
US2510171A (en) * 1948-05-25 1950-06-06 Collins Radio Co Filament mount for high-power tubes
GB987461A (en) * 1962-05-31 1965-03-31 Standard Telephones Cables Ltd Thermionic valves
FR1455956A (en) * 1965-07-20 1966-05-20 Thomson Houston Comp Francaise Direct heating cathode improvements
JPS4721082Y1 (en) * 1967-09-01 1972-07-13
US3564318A (en) * 1969-03-27 1971-02-16 Gen Electric Electrode support structure utilizing a corregated metal ribbon for accomodating thermal expansion

Also Published As

Publication number Publication date
JPS5971233A (en) 1984-04-21
EP0101108A1 (en) 1984-02-22
DE3369423D1 (en) 1987-02-26
US4546286A (en) 1985-10-08

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