EP0101108B1 - Tube électronique, en particulier tube émetteur - Google Patents

Tube électronique, en particulier tube émetteur 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
Authority
EP
European Patent Office
Prior art keywords
cathode
wires
cathode wires
valve according
joining
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
EP83201027A
Other languages
German (de)
English (en)
Other versions
EP0101108A1 (fr
Inventor
Hans Holenstein
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.)
BBC Brown Boveri AG Switzerland
Original Assignee
BBC Brown Boveri AG Switzerland
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 BBC Brown Boveri AG Switzerland filed Critical BBC Brown Boveri AG Switzerland
Publication of EP0101108A1 publication Critical patent/EP0101108A1/fr
Application granted granted Critical
Publication of EP0101108B1 publication Critical patent/EP0101108B1/fr
Expired legal-status Critical Current

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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
    • H01J1/15—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.

Landscapes

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

Claims (8)

1. Tube électronique, en particulier tube émetteur,
a) avec une structure coaxiale des électrodes,
b) avec des bagues de raccordement électrique (7, 8) superposées, qui sont raccordées à des arrivées de courant (1, 2) concentriques,
c) avec une cathode cylindrique à chauffage direct située entre ces bagues de raccordement,
d) dans lequel la cathode comporte des filaments cathodiques (5) individuels disposés parallèlement l'un à l'autre, qui forment l'enveloppe cylindrique,
e) dans lequel l'inclinaison des filaments cathodiques forme, au moins par tronçons, un angle aigu par rapport au plan d'une bague de raccordement,
f) avec au moins une bague de maintien (6) qui est disposée entre les bagues de raccordement (7, 8) et qui est attachée aux filaments cathodiques (5),

caractérisé en ce que
g) l'inclinaison des filaments cathodiques (5) change de signe entre les bagues de raccordement (7, 8) et que
h) la bague de maintien (6) est attachée de façon rotative aux filaments cathodiques.
2. Tube électronique suivant la revendication 1 caractérisé en ce que les filaments cathodiques (5) sont soudés aux bagues de raccordement (7, 8).
3. Tube électronique suivant la revendication 1 ou 2, caractérisé en ce que les filaments cathodiques (5) sont soudés à la bague de maintien (6).
4. Tube électronique suivant une des revendications 1 à 3 caractérisé en ce que les filaments cathodiques (5) sont disposés symétriquement par rapport au plan moyen (12) entre les bagues de raccordement (7, 8).
5. Tube électronique suivant la revendication 4, caractérisé en ce que les filaments cathodiques (5) présentent une première inclinaison depuis la bague de raccordement inférieure (7) jusqu'au plan moyen (12) et une deuxième inclinaison depuis le plan moyen (12) jusqu'à la bague de raccordement supérieure (8), qui a la même valeur que la première inclinaison mais qui est affectée du signe contraire.
6. Tube électronique suivant la revendication 4 ou 5, caractérisé en ce qu'une bague de maintien (6) assemble les filaments cathodiques (5) dans le plan moyen (12).
7. Tube électronique suivant une des revendications 1 à 6, caractérisé en ce que
a) la cathode est entourée concentriquement par une grille cylindrique (13) constituée de fils de grille (14),
b) qui sont parallèles aux filaments cathodiques (5) lorsque la cathode est à sa température de fonctionnement, et
c) en ce qu'un verrou supérieur (15) de la grille (13) est attaché rigidement à la cathode.
8. Tube électronique suivant la revendication 7, caractérisé en ce que chacun des fils (14) de la grille est situé entre deux filaments cathodiques (5) voisins.
EP83201027A 1982-07-27 1983-07-12 Tube électronique, en particulier tube émetteur Expired EP0101108B1 (fr)

Applications Claiming Priority (2)

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

Publications (2)

Publication Number Publication Date
EP0101108A1 EP0101108A1 (fr) 1984-02-22
EP0101108B1 true EP0101108B1 (fr) 1987-01-21

Family

ID=4278242

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83201027A Expired EP0101108B1 (fr) 1982-07-27 1983-07-12 Tube électronique, en particulier tube émetteur

Country Status (4)

Country Link
US (1) US4546286A (fr)
EP (1) EP0101108B1 (fr)
JP (1) JPS5971233A (fr)
DE (1) DE3369423D1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2214705A (en) * 1988-01-26 1989-09-06 English Electric Valve Co Ltd Directly heated cathode
FR2662020B1 (fr) * 1990-05-11 1996-04-19 Thomson Tubes Electroniques Tube electronique a grille cylindrique.

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2022212A (en) * 1932-07-29 1935-11-26 Heintz & Kaufman Ltd Low capacity thermionic tube
US2277858A (en) * 1941-05-17 1942-03-31 Bell Telephone Labor Inc Electronic discharge device
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 (fr) * 1965-07-20 1966-05-20 Thomson Houston Comp Francaise Perfectionnements aux cathodes à chauffage direct
JPS4721082Y1 (fr) * 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
EP0101108A1 (fr) 1984-02-22
JPS5971233A (ja) 1984-04-21
US4546286A (en) 1985-10-08
DE3369423D1 (en) 1987-02-26

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