EP0178359B1 - Linearstrahlröhren - Google Patents

Linearstrahlröhren Download PDF

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Publication number
EP0178359B1
EP0178359B1 EP19840307241 EP84307241A EP0178359B1 EP 0178359 B1 EP0178359 B1 EP 0178359B1 EP 19840307241 EP19840307241 EP 19840307241 EP 84307241 A EP84307241 A EP 84307241A EP 0178359 B1 EP0178359 B1 EP 0178359B1
Authority
EP
European Patent Office
Prior art keywords
tube
anode
end wall
tubular member
remote
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
EP19840307241
Other languages
English (en)
French (fr)
Other versions
EP0178359A1 (de
Inventor
Robin Charles Moorhouse King
Maurice Esterson
John Dr. Clarke
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.)
UK Secretary of State for Defence
Teledyne UK Ltd
Original Assignee
UK Secretary of State for Defence
English Electric Valve Co Ltd
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
Priority to GB08320613A priority Critical patent/GB2144263B/en
Application filed by UK Secretary of State for Defence, English Electric Valve Co Ltd filed Critical UK Secretary of State for Defence
Priority to DE8484307241T priority patent/DE3473376D1/de
Priority to EP19840307241 priority patent/EP0178359B1/de
Priority to AT84307241T priority patent/ATE36428T1/de
Publication of EP0178359A1 publication Critical patent/EP0178359A1/de
Application granted granted Critical
Publication of EP0178359B1 publication Critical patent/EP0178359B1/de
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J23/00—Details of transit-time tubes of the types covered by group H01J25/00
    • H01J23/02—Electrodes; Magnetic control means; Screens
    • H01J23/06—Electron or ion guns

Definitions

  • This invention relates to linear beam tubes and more particularly to the electron guns of such tubes.
  • the glass or ceramic envelope of the linear beam tube is represented at 1
  • the cathode of its electron gun is represented at 2
  • the anode of its electron gun is represented at 3.
  • the anode 3 is mounted directly upon the first pole piece 4 of a focussing structure at the entrance of a slow wave structure (not represented but to the right as viewed) of the linear beam tube. Commonly but not necessarily this first pole piece 4 constitutes also an end wall of the first cavity of the slow wave structure.
  • the anode 3, mounted as it is on the first pole piece 4 is held at ground potential and the length of the main cathode voltage insulator (i.e.
  • the length L of the envelope 1 electrically between the cathode 2 and the pole piece 4) is determined by the voltage stand-off requirements external to the tube. Where the tube operates in air the length L requires to be longer than would be the case if the gun end of the tube were to be immersed in a dielectric liquid.
  • the anode electrode 3 is isolated from the pole piece 4 and is mounted upon a metal cylinder 5 which cylinder is in turn supported between two insulating lengths of envelope 1' and 1" which are each of length equal to L.
  • an external limiting resistor 7 Between the electrical connection formed by flange 6 and earth is an external limiting resistor 7.
  • the end of the resistor 7 remote from the flange 6 is grounded by being attached to the first pole piece 4. In some cases grounding is effected not via the first pole piece 4 but via a current sensor.
  • the present invention seeks to provide an improved linear beam tube in which the above difficulty is reduced.
  • an electron beam tube comprises an electron gun having at one end thereof a cathode and at the other end thereof an anode, said anode being mounted adjacent to but isolated from an end wall of a structure downstream of said gun and wherein said anode is supported by means of folded mounting means comprised of a first part extending back from said anode towards the cathode end of said gun and a second part extending forward from the end of said first part remote from said anode towards said end wall, one of said two parts being of insulating material and having provided on a surface thereof a limiting impedance which is electrically in series in a path between said anode and an external termination which in operation may be grounded (directly or indirectly e.g. via a current sensor) whereby to permit said anode to tend to charge towards cathode potential if an anode to cathode arc occurs.
  • Said structure may for example be a focussing structure; wave propagating structure; an electron beam tunnel or the like depending upon the type of linear beam tube to which the invention is applied.
  • the end of said second part adjacent said end wall may be attached to said end wall or carried from the envelope of said tube at a position adjacent said end wall.
  • said end wall will be the first pole piece of a focussing structure, in which case where the end of said second part adjacent to said end wall is attached to said end wall said pole piece may comprise said external termination.
  • said first and second parts of which said folded mounting means is comprised are, in any plane transverse to the beam axis over the major portions of their lengths, generally circular in cross section and co-axial with said beam axis.
  • Both of said parts may overall be generally cylindrical and united at their ends remote from said end wall and said anode by flange means or at least one of said two parts may be generally conical.
  • said first part comprises a ceramic tubular member and said second part comprises a conical metallic member which has a flange at its end remote from said first part which flange extends through the envelope of said tube adjacent said end wall.
  • said limiting impedance is provided on an internal surface of said tubular member comprising said first part, with one end in contact with said anode and the other in contact with said conical metallic member.
  • said first part comprises a metallic tubular member co-axially within a ceramic tubular member which comprises said second part, said ceramic tubular member being attached at one end to said end wall and the end of said metallic tubular member remote from said anode being flanged with its flange attached to the end of said ceramic tubular member remote from said end wall.
  • said limiting impedance is provided on an external surface of said tubular member comprising said second part with one end in contact with said flange and the other electrically connected to said external termination.
  • Said limiting impedance may comprise deposited resistive material preferably deposited within a groove in the surface of that member upon which said limiting impedance is provided as aforesaid.
  • the anode 3 is isolated from the pole piece 4 and is mounted upon a ceramic cylindrical member 8 which extends back towards the cathode end of the electron gun.
  • the cylindrical ceramic member 8 is supported by means of a flanged conical metallic member 9 which surrounds the cylindrical member 8.
  • One end 10 of the conical member 9 is fixed to the end of the cylindrical ceramic member 8 remote from the anode 3.
  • the other flanged end of the conical member 9 extends through the envelope 1 of the tube to form an external termination 11.
  • the length of envelope between the flange 11 and the mount of the cathode 2 is equal to L.
  • resistive material On the interior surface of the cylindrical ceramic member 8 is deposited within a groove 12 resistive material forming the required limiting impedance.
  • the deposited resistive material extends beyond the groove so that one end 13 of the limiting impedance is in electrical contact with the anode 3 and the other end extends over the end of the cylindrical ceramic member 8 to contact end 10 of the conical metallic member 9.
  • the resistive material is deposited in the base of the groove 12 and extends only partly up the side walls of the groove.
  • the limiting impedance is again in series in a path between the anode 3 and the external termination 11. If this termination is grounded then as already described with reference to Figure 2, arcs occurring between the cathode 2 and the anode 3 may be suppressed. It will be noted however that the overall length of the gun section of the protected tube illustrated by Figure 3 corresponds more closely to that of the electron gun of the unprotected tube of Figure 1 than to the lengthy gun section of the protected tube of Figure 2.
  • anode 3 is again isolated from the pole piece 4.
  • Anode 3 is mounted upon a generally cylindrical metallic member 14 which extends back from the anode 3 towards the cathode end of the electron gun.
  • Member 14 is co-axially within a cylindrical ceramic member 15 which is mounted at one end on the pole piece 4 and extends back therefrom towards the cathode end of the electron gun.
  • the end of member 14 remote from the anode 3 is flanged with itsflange 16 attached to the end of the ceramic member remote from the pole piece 4.
  • an annular metallic member 17 Passing through the envelope wall 1 adjacent to, but spaced from, the pole piece 4 is an annular metallic member 17 which extends inwardly towards the tube axis to contact the cylindrical ceramic member 15. Member 17 provides an external termination.
  • cylindrical ceramic member 15 On the exterior surface of cylindrical ceramic member 15 is deposited within a groove 18, resistive material forming the required limiting impedance.
  • the deposited impedance formed again extends, beyond the groove, from the flange 16 of cylindrical metallic member 14 to member 17 forming said external termination.
  • the limiting impedance is in series in a path between the anode 3 and the external termination formed by member 17 and if the last mentioned is grounded then again as already described with reference to Figure 2 arcs occurring between the cathode 2 and the anode 3 may be suppressed.

Landscapes

  • Microwave Tubes (AREA)

Claims (14)

1. Elektronenstrahlröhre mit einer Elektronenkanone, die an ihrem einem Ende eine Katode (2) und an ihrem anderen Ende eine Anode (3) besitzt, wobei die Anode benachbart zu, jedoch isoliert von einer Endwand (4) einer Struktur abstromseitig zur Kanone befestigt ist, und wobei die Anode mittels eines gefalteten Befestigungsmittels abgestützt ist, das aus einem ersten, sich von der Anode zu dem Katodenende der Kanone zurückerstreckenden Teil (8, 14) und einem zweiten, sich von dem von der Anode abgelegenen Ende des ersten Teiles nach vorne zu der Endwand hin erstreckenden Teil (9, 15) besteht, wobei eines der beiden Teilen aus isolierendem Material ist und eine an einer Oberfläche desselben vorgesehene Begrenzungsimpedanz enthält, die elektrisch in Reihe in einem Weg zwischen der Anode und einem Außenanschluß (11, 17) liegt, der im Betrieb geerdet sein kann, um der Anode eine Ladungstendenz zum Katodenpotential hin zu erlauben, falls ein Anoden/Katoden-Bogen auftritt.
2. Röhre nach Anspruch 1 und bei der das der Endwand (4) benachbarte Ende des zweiten Teils (15) an der Endwand angebracht ist.
3. Röhre nach Anspruch 1 und bei der das der Endwand benachbarte Ende des zweiten Teiles (9) von dem Mantel (1) der Röhre an einer der Endwand benachbarten Stelle gehalten ist.
4. Röhre nach einem der vorangehenden Ansprüche, und bei der die Endwand (4) das erste Polstück einer Fokussierungsstruktur ist.
5. Röhre nach Anspruch 4 in Abhängigkeit von Anspruch 2 und bei der das Polstück den äußeren Anschluß bildet.
6. Röhre nach einem der vorangehenden Ansprüche, und bei der das erste und das zweite Teil, aus denen das gefaltete Befestigungsmittel besteht, in irgendeiner Ebene quer zur Strahlachse über den Hauptteil ihrer Längen von allgemein kreisförmigem Querschnitt und koaxial zur Strahlachse sind.
7. Röhre nach Anspruch 6 und bei der beide Teile insgesamt zylindrisch und an ihren von der Endwand und der Anode abgelegenen Enden durch Flanschmittel vereinigt sind.
8. Röhre nach Anspruch 6 und bei der diese beiden Teile insgesamt allgemein zylindrisch sind, wobei mindestens eines der beiden Teile allgemein kegelförmig ist und die beiden Teile an ihren von der Endwand abgelegenen Enden vereinigt sind.
9. Röhre nach einem der Ansprüche 1 bis 6 und bei der das erste Teil (8) ein rohrförmiges Keramikelement und das zweite Teil (9) ein kegelförmiges Metallelement umfaßt, das an seinem von dem ersten Teil abgelegenen Ende einen Flansch besitzt, der sich benachbart zur Endwand (4) durch den Mantel (1) danz an einer Innenfläche des rohrförmigen Elementes vorgesehen ist, das das erste Teil (8) bildet, wobei ein Ende mit der Anode (3) und das andere mit dem kegelförmigen Metallelement (9) in Kontakt ist.
11. Röhre nach einem der Ansprüche 1 bis 6 und bei der das erste Teil (14) ein rohrförmiges Metallelement koaxial innerhalb eines rohrförmigen Keramikelementes (15) umfaßt, welches das zweite Teil bildet, wobei das rohrförmige Keramikelement an einem Ende an der Endwand (4) angebracht ist und das von der Anode abgelegene Ende des rohrförmigen Metallelementes mit einem Flansch versehen ist, wobei sein Flansch (14) an dem von der Endwand abgelegenen Ende des rohrförmigen Keramikelementes angebracht ist.
12. Röhre nach Anspruch 11 und bei der die Begrenzungsimpedanz an einer Außenfläche des rohrförmigen Elementes vorgesehen ist, welches das zweite Teil (15) bildet, mit einem Ende in Kontakt mit dem Flansch (16) und dem anderen elektrisch mit dem Außenanschluß (17) verbunden.
13. Röhre nach einem der vorangehenden Ansprüche und bei der die Begrenzungsimpendanz abgeschiedenes Widerstandmaterial umfaßt.
14. Röhre nach Anspruch 13 und bei der das Widerstandsmaterial in einer Nut (18) in der Oberfläche des Teiles abgeschieden ist, auf dem die Begrenzungsimpedanz vorgesehen ist.
EP19840307241 1983-07-30 1984-10-19 Linearstrahlröhren Expired EP0178359B1 (de)

Priority Applications (4)

Application Number Priority Date Filing Date Title
GB08320613A GB2144263B (en) 1983-07-30 1983-07-30 Improvements in or relating to linear beam tubes
DE8484307241T DE3473376D1 (en) 1984-10-19 1984-10-19 Linear beam tubes
EP19840307241 EP0178359B1 (de) 1983-07-30 1984-10-19 Linearstrahlröhren
AT84307241T ATE36428T1 (de) 1984-10-19 1984-10-19 Linearstrahlroehren.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB08320613A GB2144263B (en) 1983-07-30 1983-07-30 Improvements in or relating to linear beam tubes
EP19840307241 EP0178359B1 (de) 1983-07-30 1984-10-19 Linearstrahlröhren

Publications (2)

Publication Number Publication Date
EP0178359A1 EP0178359A1 (de) 1986-04-23
EP0178359B1 true EP0178359B1 (de) 1988-08-10

Family

ID=26094354

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19840307241 Expired EP0178359B1 (de) 1983-07-30 1984-10-19 Linearstrahlröhren

Country Status (2)

Country Link
EP (1) EP0178359B1 (de)
GB (1) GB2144263B (de)

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB655706A (en) * 1947-10-04 1951-08-01 Philips Nv Improvements in cathode-ray tubes
GB872170A (en) * 1956-11-10 1961-07-05 Ferranti Ltd Improvements relating to electron-beam discharge tubes
NL122370C (de) * 1960-02-08
DE1273703B (de) * 1961-02-10 1968-07-25 Telefunken Patent Elektronenstrahlauffaenger fuer Laufzeitroehren, insbesondere Lauffeldroehren
DE1541078B2 (de) * 1966-07-08 1975-01-02 Telefunken Patentverwertungsgesellschaft Mbh, 7900 Ulm Elektronenstrahlröhre mit Auffängerelektrode
GB1199575A (en) * 1966-12-17 1970-07-22 English Electric Valve Co Ltd Improvements in or relating to Electron Beam Tubes.
GB1312048A (en) * 1969-07-18 1973-04-04 Emi Ltd Electron discharge devices
JPS55159548A (en) * 1979-05-30 1980-12-11 Toshiba Corp Electron gun structure

Also Published As

Publication number Publication date
EP0178359A1 (de) 1986-04-23
GB8320613D0 (en) 1983-09-01
GB2144263A (en) 1985-02-27
GB2144263B (en) 1986-10-29

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