EP0156003A1 - Electron gun for an electron tube, especially for a travelling-wave tube - Google Patents

Electron gun for an electron tube, especially for a travelling-wave tube Download PDF

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Publication number
EP0156003A1
EP0156003A1 EP84114708A EP84114708A EP0156003A1 EP 0156003 A1 EP0156003 A1 EP 0156003A1 EP 84114708 A EP84114708 A EP 84114708A EP 84114708 A EP84114708 A EP 84114708A EP 0156003 A1 EP0156003 A1 EP 0156003A1
Authority
EP
European Patent Office
Prior art keywords
generator system
cathode
tube
electron
shaping electrode
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.)
Granted
Application number
EP84114708A
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German (de)
French (fr)
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EP0156003B1 (en
Inventor
Erwin Dr. rer. nat. Hübner
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.)
Siemens AG
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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
Publication of EP0156003A1 publication Critical patent/EP0156003A1/en
Application granted granted Critical
Publication of EP0156003B1 publication Critical patent/EP0156003B1/en
Expired legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J3/00—Details of electron-optical or ion-optical arrangements or of ion traps common to two or more basic types of discharge tubes or lamps
    • H01J3/02—Electron guns
    • H01J3/026—Eliminating deleterious effects due to thermal effects, electric or magnetic field
    • 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
    • H01J23/04—Cathodes

Definitions

  • the invention relates to a jet generator system according to the preamble of claim 1.
  • a beam generator system with a beam-shaping electrode and a supply cathode of cylindrical shape with an end face emission surface for electron beam tubes formed by a porous body is known from DE-PS 19 63 333.
  • the previously used axial fastening elements of the supply cathode in the Wehnelt cylinder give rise to changes in position of the supply cathode in the Wehnelt cylinder and thus to beam defocusing at different ambient temperatures.
  • the invention has for its object to prevent a change in position of the supply cathode in the beam-shaping electrode at different ambient temperatures in a beam generator system and thus to avoid beam defocusing.
  • the supply cathode is now connected directly below the emission disk directly to the beam-shaping electrode, which is preferably designed as a Wehnelt cylinder.
  • the beam-shaping electrode which is preferably designed as a Wehnelt cylinder. This is advantageously accomplished with the aid of a disk into which slots are radially stamped.
  • the stationary webs are alternately deflected upwards and downwards in a straight division. In the event of temperature fluctuations, the expansions (contractions) occurring in the radial direction are absorbed by the webs deflected upwards and downwards.
  • the beam generator system shown in FIGS. 1 and 2 essentially consists of the supply cathode 1, which is connected below the emission disk 2 by a radial cathode holder 3 directly to the beam-shaping electrode 4, in this exemplary embodiment a Wehnelt cylinder.
  • the connections for the indirect heating of the supply cathode 1 are provided with the reference number 5.
  • the cathode holder 3 is preferably in the form of a disk into which slots are radially stamped. The remaining webs are with a straight part alternately deflected downwards and upwards.
  • the supply cathode 1 is fastened to the disk, which is provided with webs and serves as the cathode holder 3, by means of rings 7, 8.
  • a fastening ring 6 is provided for fastening the disc in the Wehnelt cylinder (beam-shaping electrode 4).
  • Metals with a high melting point such as tantalum or molybdenum are used as the material for the disk serving as the cathode holder 3.

Abstract

Bei diesem Strahlerzteugersystem soll eine Positionsänderung der Vorratskathode (1) in der strahlformenden Elektrode (4) bei verschiedenen Umgebungstemperaturen unterbunden und damit eine Strahldefokussierung vermieden werden. Zu diesem Zweck wird die Vorratskathode (1) unterhalb der Emissionsscheibe (2) durch eine radiale Kathodenhalterung (3) direkt mit der strahlformenden Elektrode (4) verbunden. Ein erfindungsgemäßes Strahlerzeugersystem findet insbesondere bei Wanderfeldröhren Verwendung.In this radiator generator system, a change in position of the supply cathode (1) in the beam-shaping electrode (4) at different ambient temperatures is to be prevented, and thus beam defocusing is to be avoided. For this purpose, the supply cathode (1) below the emission disk (2) is connected directly to the beam-shaping electrode (4) by a radial cathode holder (3). A jet generator system according to the invention is used in particular in traveling wave tubes.

Description

Die Erfindung betrifft ein Strahlerzeugersystem nach dem Oberbegriff des Anspruchs 1.The invention relates to a jet generator system according to the preamble of claim 1.

Ein Strahlerzeugersystem mit einer strahlformenden Elektrode und einer Vorratskathode von zylindrischer Form mit einer von einem porösen Körper gebildeten stirnseitigen Emissionsfläche für Elektronenstrahlröhren ist aus der DE-PS 19 63 333 bekannt.A beam generator system with a beam-shaping electrode and a supply cathode of cylindrical shape with an end face emission surface for electron beam tubes formed by a porous body is known from DE-PS 19 63 333.

Bislang wurde außerdem versucht, durch geeignete Materialauswahl bzw. Materialkombinationen der im System axial stehenden Befestigungsfolien eine Lagekonstanz der Vorratskathode in einem als strahlformende Elektrode verwendeten Wehneltzylinder bei verschiedenen Betriebstemperaturen zu erreichen.To date, attempts have also been made to achieve a positional stability of the supply cathode in a Wehnelt cylinder used as a beam-shaping electrode at various operating temperatures by means of suitable material selection or material combinations of the fastening foils axially positioned in the system.

Die bisher verwendeten axialen Befestigungselemente der Vorratskathode im Wehneltzylinder geben bei verschiedenen Umgebungstemperaturen Anlaß zu Positionsänderungen der Vorratskathode im Wehneltzylinder und damit zur Strahldefokussierung.The previously used axial fastening elements of the supply cathode in the Wehnelt cylinder give rise to changes in position of the supply cathode in the Wehnelt cylinder and thus to beam defocusing at different ambient temperatures.

Der Erfindung liegt die Aufgabe zugrunde, bei einem Strahlerzeugersystem eine Positionsänderung der Vorratskathode in der strahlformenden Elektrode bei verschiedenen Umgebungstemperaturen zu unterbinden und damit eine Strahldefokussierung zu vermeiden.The invention has for its object to prevent a change in position of the supply cathode in the beam-shaping electrode at different ambient temperatures in a beam generator system and thus to avoid beam defocusing.

Diese Aufgabe wird erfindungsgemäß durch ein Strahlerzeugersystem mit den Merkmalen des Anspruchs 1 gelöst.This object is achieved according to the invention by a jet generator system with the features of claim 1.

Weitere vorteilhafte Ausgestaltungen der Erfindung sind Gegenstand zusätzlicher Ansprüche 2 und 3.Further advantageous embodiments of the invention are the subject of additional claims 2 and 3.

Die Vorratskathode ist nunmehr unmittelbar unterhalb der Emissionsscheibe direkt mit der strahlformenden, vorzugsweise als Wehneltzylinder ausgebildeten Elektrode verbunden. Dies wird vorteilhaft mit Hilfe einer Scheibe bewerkstelligt, in die radial Schlitze eingestanzt sind. Die stehenbleibenden Stege werden bei gerader Teilung abwechselnd nach oben und nach unten ausgelenkt. Bei Temperaturschwankungen werden dadurch die in radialer Richtung auftretenden Ausdehnungen (Zusammenziehungen) von den nach oben und unten ausgelenkten Stegen aufgenommen. Bei symmetrischer Steganord-nung und homogener Materialbeschaffenheit der Emissionsscheibe treten dann Wärmebewegungsdifferenzen zwischen Vorratskathode und dem Wehneltzylinder in axialer Richtung nicht auf.The supply cathode is now connected directly below the emission disk directly to the beam-shaping electrode, which is preferably designed as a Wehnelt cylinder. This is advantageously accomplished with the aid of a disk into which slots are radially stamped. The stationary webs are alternately deflected upwards and downwards in a straight division. In the event of temperature fluctuations, the expansions (contractions) occurring in the radial direction are absorbed by the webs deflected upwards and downwards. With a symmetrical web arrangement and homogeneous material properties of the emission disk, there are no thermal movement differences between the supply cathode and the Wehnelt cylinder in the axial direction.

Die Erfindung wird anhand eines bevorzugten Ausführungsbeispiels weiter erläutert. Einander entsprechende Teile sind in den Figuren mit den gleichen Bezugszeichen versehen. Teile, die nicht unbedingt zum Verständnis der Erfindung beitragen, sind in den Figuren unbezeichnet oder weggelassen.The invention is further explained on the basis of a preferred exemplary embodiment. Corresponding parts are provided with the same reference symbols in the figures. Parts which do not necessarily contribute to an understanding of the invention are not shown in the figures or are omitted.

Es zeigen:

  • Fig. 1 das schematisch teilweise im Schnitt dargestellte Strahlerzeugersystem gemäß der Erfindung und
  • Fig. 2 eine Seitenansicht schematisch teilweise im Schnitt des Strahlerzeugersystems nach Fig. 1.
Show it:
  • Fig. 1 shows the schematically partially sectioned beam generator system according to the invention and
  • FIG. 2 shows a schematic side view, partly in section, of the jet generator system according to FIG. 1.

Das in den Figuren 1 und 2 dargestellte Strahlerzeugersystem besteht im wesentlichen aus der Vorratskathode 1, die unterhalb der Emissionsscheibe 2 durch eine radiale Kathodenhalterung 3 direkt mit der strahlformenden Elektrode 4, in diesem Ausführungsbeispiel einem Wehneltzylinder, verbunden ist. Die Anschlüsse für die indirekte Heizung der Vorratskathode 1 sind mit dem Bezugszeichen 5 versehen. Die Kathodenhalterung 3 hat vorzugsweise die Form einer Scheibe, in die radial Schlitze eingestanzt sind. Die stehenbleibenden Stege sind bei gerader Teilung abwechselnd nach unten und nach oben ausgelenkt. Die Vorratskathode 1 ist an der als Kathodenhalterung 3 dienenden, mit Stegen versehenen Scheibe mittels Ringen 7, 8 befestigt. Zur Befestigung der Scheibe im Wehneltzylinder (strahlformende Elektrode 4) ist ein Befestigungsring 6 vorgesehen. Als Material für die als Kathodenhalterung 3 dienende Scheibe finden Metalle mit hohem Schmelzpunkt wie Tantal oder Molybdän Verwendung.The beam generator system shown in FIGS. 1 and 2 essentially consists of the supply cathode 1, which is connected below the emission disk 2 by a radial cathode holder 3 directly to the beam-shaping electrode 4, in this exemplary embodiment a Wehnelt cylinder. The connections for the indirect heating of the supply cathode 1 are provided with the reference number 5. The cathode holder 3 is preferably in the form of a disk into which slots are radially stamped. The remaining webs are with a straight part alternately deflected downwards and upwards. The supply cathode 1 is fastened to the disk, which is provided with webs and serves as the cathode holder 3, by means of rings 7, 8. A fastening ring 6 is provided for fastening the disc in the Wehnelt cylinder (beam-shaping electrode 4). Metals with a high melting point such as tantalum or molybdenum are used as the material for the disk serving as the cathode holder 3.

Claims (3)

1. Strahlerzeugersystem für Elektronenröhren, insbesondere Wanderfeldröhren, mit einer strahlformenden Elektrode und einer darin gehalterten, stirnseitig mit einer Emissionsscheibe versehenen Vorratskathode, dadurch gekennzeichnet , daß die Vorratskathode (1) unterhalb der Emissionsscheibe (2) durch eine radiale Kathoderhalterung (3) direkt mit der strahlformenden Elektrode (4) verbunden ist.1. A beam generator system for electron tubes, in particular traveling wave tubes, with a beam-shaping electrode and a supply cathode held therein, which is provided on the front side with an emission disc, characterized in that the supply cathode (1) below the emission disc (2) by means of a radial cathode holder (3) directly with the beam-shaping electrode (4) is connected. 2. Strahlerzeugersystem nach Anspruch 1, dadurch gekennzeichnet, daß die Kathodenhalterung (3) aus einer Scheibe besteht, in die radial Schlitze eingestanzt sind und daß die stehenbleibenden Stege bei gerader Teilung nach oben und nach unten ausgelenkt sind.2. Jet generator system according to claim 1, characterized in that the cathode holder (3) consists of a disc into which radial slots are punched and that the standing webs are deflected upwards and downwards in a straight division. 3. Strahlerzeugersystem nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Kathodenhalterung (3) aus einem Metall mit hohem Schmelzpunkt wie Tantal oder Molybdän besteht.3. Jet generator system according to claim 1 or 2, characterized in that the cathode holder (3) consists of a metal with a high melting point such as tantalum or molybdenum.
EP84114708A 1984-02-29 1984-12-04 Electron gun for an electron tube, especially for a travelling-wave tube Expired EP0156003B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3407434 1984-02-29
DE3407434A DE3407434A1 (en) 1984-02-29 1984-02-29 RADIATOR GENERATOR SYSTEM FOR ELECTRONIC TUBES, IN PARTICULAR WALKER TUBES

Publications (2)

Publication Number Publication Date
EP0156003A1 true EP0156003A1 (en) 1985-10-02
EP0156003B1 EP0156003B1 (en) 1988-03-09

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Family Applications (1)

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EP84114708A Expired EP0156003B1 (en) 1984-02-29 1984-12-04 Electron gun for an electron tube, especially for a travelling-wave tube

Country Status (4)

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US (1) US4644219A (en)
EP (1) EP0156003B1 (en)
JP (1) JPS60211739A (en)
DE (2) DE3407434A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2965971A1 (en) * 2010-10-06 2012-04-13 Thales Sa Electronic traveling wave tube i.e. microwave frequency amplifier, has cathode/Wehnelt emission assembly arranged in contact with inner surface of shield by electrical insulating bodies that are regularly provided around assembly

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5534747A (en) * 1994-05-13 1996-07-09 Litton Systems, Inc. Variable focus electron gun assembly with ceramic spacers
US9466453B2 (en) * 2013-12-30 2016-10-11 Mapper Lithography Ip B.V. Cathode arrangement, electron gun, and lithography system comprising such electron gun
NL2015039B1 (en) * 2013-12-30 2016-07-08 Mapper Lithography Ip Bv Focusing electrode for cathode arrangement, electron gun, and lithography system comprising such electron gun.
DE102018123100A1 (en) * 2018-09-20 2020-03-26 Thales Deutschland GmbH Electron Devices Electron gun

Citations (7)

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Publication number Priority date Publication date Assignee Title
DE715185C (en) * 1937-02-14 1941-12-16 Manfred Von Ardenne Arrangement for holding the glow cathode in Braun tubes
US3100273A (en) * 1960-07-05 1963-08-06 Raytheon Co Cathode support
US3746087A (en) * 1971-04-19 1973-07-17 Varian Associates Heat dissipation device
US3963955A (en) * 1974-04-15 1976-06-15 Varian Associates Means and method for suppressing oscillations in electron guns
US3983442A (en) * 1975-05-19 1976-09-28 Westinghouse Electric Corporation Electron gun cathode support structure
EP0020253A1 (en) * 1979-05-31 1980-12-10 Thomson-Csf Insulated collector for an electronic power tube
WO1984000249A1 (en) * 1982-06-25 1984-01-19 Hughes Aircraft Co Buffer for an electron beam collector

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BE410992A (en) * 1934-08-30
US2146365A (en) * 1934-12-13 1939-02-07 John C Batchelor Electron emitter
GB564546A (en) * 1942-11-02 1944-10-03 Gerhard Liebmann Improvements in or relating to cathode ray tubes
FR1102574A (en) * 1954-04-08 1955-10-24 Soc Nouvelle Outil Rbv Radio Improvements to electron gun structures for film tubes
GB802108A (en) * 1956-01-20 1958-10-01 Rank Cintel Ltd Improvements in or relating to electron guns for cathode ray tubes
NL248618A (en) * 1959-02-19
DE1223063B (en) * 1965-06-30 1966-08-18 Siemens Ag Indirectly heated cathode for electrical discharge vessels and process for temperature control of the cathode
DE1963333C3 (en) * 1969-12-17 1973-12-13 Siemens Ag, 1000 Berlin U. 8000 Muenchen Jet generator system and process for its manufacture
FR2251096B1 (en) * 1973-11-13 1977-08-19 Thomson Csf
US4298818A (en) * 1979-08-29 1981-11-03 Rca Corporation Electron gun
NL8002343A (en) * 1980-04-23 1981-11-16 Philips Nv ELECTRON GUN AND CATHODE JET CONTAINING SUCH ELECTRON GUN.

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE715185C (en) * 1937-02-14 1941-12-16 Manfred Von Ardenne Arrangement for holding the glow cathode in Braun tubes
US3100273A (en) * 1960-07-05 1963-08-06 Raytheon Co Cathode support
US3746087A (en) * 1971-04-19 1973-07-17 Varian Associates Heat dissipation device
US3963955A (en) * 1974-04-15 1976-06-15 Varian Associates Means and method for suppressing oscillations in electron guns
US3983442A (en) * 1975-05-19 1976-09-28 Westinghouse Electric Corporation Electron gun cathode support structure
EP0020253A1 (en) * 1979-05-31 1980-12-10 Thomson-Csf Insulated collector for an electronic power tube
WO1984000249A1 (en) * 1982-06-25 1984-01-19 Hughes Aircraft Co Buffer for an electron beam collector

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2965971A1 (en) * 2010-10-06 2012-04-13 Thales Sa Electronic traveling wave tube i.e. microwave frequency amplifier, has cathode/Wehnelt emission assembly arranged in contact with inner surface of shield by electrical insulating bodies that are regularly provided around assembly

Also Published As

Publication number Publication date
EP0156003B1 (en) 1988-03-09
DE3407434A1 (en) 1985-08-29
DE3469826D1 (en) 1988-04-14
US4644219A (en) 1987-02-17
JPS60211739A (en) 1985-10-24

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