EP0130395A1 - Cathode à chauffage rapide - Google Patents

Cathode à chauffage rapide Download PDF

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Publication number
EP0130395A1
EP0130395A1 EP84106351A EP84106351A EP0130395A1 EP 0130395 A1 EP0130395 A1 EP 0130395A1 EP 84106351 A EP84106351 A EP 84106351A EP 84106351 A EP84106351 A EP 84106351A EP 0130395 A1 EP0130395 A1 EP 0130395A1
Authority
EP
European Patent Office
Prior art keywords
cathode
metal layer
outer conductor
inner conductor
cathode according
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.)
Withdrawn
Application number
EP84106351A
Other languages
German (de)
English (en)
Inventor
Erich Dr.-Ing. Dipl.-Ing. Glass
Hinrich Dr. Rer. Nat. Dipl.-Phys. Heynisch
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
Original Assignee
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 EP0130395A1 publication Critical patent/EP0130395A1/fr
Withdrawn legal-status Critical Current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
    • H01J23/04—Cathodes
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
    • Y10T428/131—Glass, ceramic, or sintered, fused, fired, or calcined metal oxide or metal carbide containing [e.g., porcelain, brick, cement, etc.]
    • Y10T428/1314—Contains fabric, fiber particle, or filament made of glass, ceramic, or sintered, fused, fired, or calcined metal oxide, or metal carbide or other inorganic compound [e.g., fiber glass, mineral fiber, sand, etc.]

Definitions

  • the invention relates to a directly heated oxide cathode, in particular for runtime tubes in pulse mode.
  • Directly heated oxide cathodes for electron tubes are known, for example, from DE-AS 2160145 and DE-AS 2904653.
  • Such oxide cathodes essentially consist of a cathode body (base metal plate) made of a high-resistance alloy and an electron emission layer.
  • the base metal plate is bow-shaped.
  • the oxide layer is applied to the outside of the flat part of the base metal plate.
  • Connections for the DC voltage source are provided at the ends of the base metal plate facing away from it.
  • the invention has for its object to provide a directly heated oxide cathode, especially for runtime tubes, which is characterized by a very short heating time.
  • the directly heated oxide cathode shown schematically in section in the figure essentially consists of a cylindrical outer conductor 1.
  • An inner conductor 2 is arranged coaxially in this.
  • the inner conductor 2 is Rb 1 Lk / 28.6.1983 attached to the outer conductor 1 by a ceramic support disk 3.
  • a thin metal layer 4, preferably made of nickel, is provided on one end of the cathode and is soldered to the inner conductor 2 and the outer conductor 1.
  • An electron-emitting oxide layer 5, for example barium oxide layer, is applied on the outside of the thin metal layer 4.
  • the cathode is designed as a matrix cathode
  • nickel powder provided with a binder and preferably sintered is sprayed onto the thin metal layer 4, which preferably consists of nickel.
  • the emission mass (oxide layer 5) is then applied.
  • Inner conductor 2 and outer conductor 1, which are preferably made of nickel or a nickel alloy, are thick-walled, so that no heating takes place when the current is high.
  • the direct current from the inner conductor 2 to the outer conductor flows over the thin-walled Kahtodenblech (metal layer 4) and heats it up quickly.
  • the thin metal layer 4 is concave and has an inhomogeneous wall thickness. This measure and a suitable choice of material for the inner and outer conductors can achieve a uniform temperature distribution of the cathode.

Landscapes

  • Electrodes For Cathode-Ray Tubes (AREA)
  • Solid Thermionic Cathode (AREA)
EP84106351A 1983-06-29 1984-06-04 Cathode à chauffage rapide Withdrawn EP0130395A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3323473 1983-06-29
DE19833323473 DE3323473A1 (de) 1983-06-29 1983-06-29 Schnellheizkathode

Publications (1)

Publication Number Publication Date
EP0130395A1 true EP0130395A1 (fr) 1985-01-09

Family

ID=6202710

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84106351A Withdrawn EP0130395A1 (fr) 1983-06-29 1984-06-04 Cathode à chauffage rapide

Country Status (3)

Country Link
US (1) US4567071A (fr)
EP (1) EP0130395A1 (fr)
DE (1) DE3323473A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0380205A1 (fr) * 1989-01-23 1990-08-01 Varian Associates, Inc. Cathode de chauffage rapide pour tubes à vide de grande puissance
WO2014064227A1 (fr) * 2012-10-26 2014-05-01 Thales Cathode a emission thermoelectronique a demarrage rapide et son procede d'elaboration

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB295637A (en) * 1927-08-15 1929-12-13 Siegmund Loewe Heated filament for thermionic valves
US2847604A (en) * 1955-06-02 1958-08-12 Gen Electric Thermionic cathode and direct current heater assembly
US2875367A (en) * 1954-10-22 1959-02-24 Gen Electric Cathode structures
DE1564951A1 (de) * 1966-12-19 1970-03-05 Telefunken Patent Kathodenanordnung

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL113461C (fr) * 1961-03-08
DE1223063B (de) * 1965-06-30 1966-08-18 Siemens Ag Mittelbar geheizte Kathode fuer elektrische Entladungsgefaesse und Verfahren zur Temperatur-regelung der Kathode
DE2159626A1 (de) * 1970-12-04 1972-06-22 Hitachi Ltd Verfahren zur Herstellung eines Leuchtschirms einer Kathodenstrahlröhre
JPS4822295B1 (fr) * 1970-12-04 1973-07-05
JPS5816737B2 (ja) * 1978-04-24 1983-04-01 株式会社日立製作所 電子管用酸化物陰極
JPS5566819A (en) * 1978-11-15 1980-05-20 Hitachi Ltd Oxide cathode for electron tube
JPS5596531A (en) * 1979-01-19 1980-07-22 Hitachi Ltd Directly heated cathode for electron tube
JPS55144631A (en) * 1979-04-28 1980-11-11 Hitachi Ltd Directly-heated cathode for electronic tube
NL8100928A (nl) * 1981-02-26 1982-09-16 Philips Nv Oxydkathode.

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB295637A (en) * 1927-08-15 1929-12-13 Siegmund Loewe Heated filament for thermionic valves
US2875367A (en) * 1954-10-22 1959-02-24 Gen Electric Cathode structures
US2847604A (en) * 1955-06-02 1958-08-12 Gen Electric Thermionic cathode and direct current heater assembly
DE1564951A1 (de) * 1966-12-19 1970-03-05 Telefunken Patent Kathodenanordnung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENTS ABSTRACTS OF JAPAN, Band 6, Nr. 211 (E-137)[1089], 23. Oktober 1982; & JP - A - 57 115 739 (TOKYO SHIBAURA DENKI K.K.) 19.07.1982 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0380205A1 (fr) * 1989-01-23 1990-08-01 Varian Associates, Inc. Cathode de chauffage rapide pour tubes à vide de grande puissance
US5015908A (en) * 1989-01-23 1991-05-14 Varian Associates, Inc. Fast warm-up cathode for high power vacuum tubes
WO2014064227A1 (fr) * 2012-10-26 2014-05-01 Thales Cathode a emission thermoelectronique a demarrage rapide et son procede d'elaboration
FR2997548A1 (fr) * 2012-10-26 2014-05-02 Thales Sa Cathode a emission thermoelectronique a demarrage rapide et son procede d'elaboration

Also Published As

Publication number Publication date
DE3323473A1 (de) 1985-01-03
US4567071A (en) 1986-01-28

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): DE GB

17P Request for examination filed

Effective date: 19850708

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19860211

RIN1 Information on inventor provided before grant (corrected)

Inventor name: HEYNISCH, HINRICH, DR. RER. NAT.DIPL.-PHYS.

Inventor name: GLASS, ERICH, DR.-ING. DIPL.-ING.