GB1359582A - Indirectly heated dispenser cathodes for electrical discharge vessels - Google Patents

Indirectly heated dispenser cathodes for electrical discharge vessels

Info

Publication number
GB1359582A
GB1359582A GB134872A GB134872A GB1359582A GB 1359582 A GB1359582 A GB 1359582A GB 134872 A GB134872 A GB 134872A GB 134872 A GB134872 A GB 134872A GB 1359582 A GB1359582 A GB 1359582A
Authority
GB
United Kingdom
Prior art keywords
cylinder
tubes
flanges
cathode
cylinders
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
GB134872A
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 GB1359582A publication Critical patent/GB1359582A/en
Expired legal-status Critical Current

Links

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
    • H01J1/20—Cathodes heated indirectly by an electric current; Cathodes heated by electron or ion bombardment
    • H01J1/28—Dispenser-type cathodes, e.g. L-cathode
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/02—Manufacture of electrodes or electrode systems
    • H01J9/04—Manufacture of electrodes or electrode systems of thermionic cathodes
    • H01J9/042—Manufacture, activation of the emissive part

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Solid Thermionic Cathode (AREA)
  • Lasers (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

1359582 Thermionic cathode constructions SIEMENS AG 12 Jan 1972 [12 Feb 1971] 1348/72 Heading H1D An indirectly heated dispenser cathode comprises a cylinder 2 having corresponding flanges 4, 5 at each end, a spiral heater 6 inside or outside the cylinders, at least three porous, sintered hollow cylindrical W tubes 7 containing emissive material mounted between the flanges and a metal foil mounting cylinder 11 attached to one end of the cathode. As shown cylinder 11 is secured to another cylinder 2 surrounding the heater 6. The cylinders 1, 2 are of Mo or Ni and cylinder 11 is of Ta. Up to 16 tubes, depending on the required output are mounted in holes in the flanges. Each tube is closed by Mo plugs 8, 9 and filled with BaO protected by paraffin wax in a Mo cup or BaCO 3 . In another embodiment the flanges 4, 5 extend outwardly, the tubes 7 are mounted outside the cylinders 1, 2 and the mounting cylinder is located within cylinder 2. The W tubes are made by applying a suspension to an Al 2 O 3 ceramic rod to form a W coating, heating to 1600‹ C., removing the coating in the form of a tube and sintering at 2200‹ C. The rod may be replaced by a Mo tube which is etched away after sintering. The cathode is used in electron beam machining apparatus to excite lasers.
GB134872A 1971-02-12 1972-01-12 Indirectly heated dispenser cathodes for electrical discharge vessels Expired GB1359582A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2106745A DE2106745C3 (en) 1971-02-12 1971-02-12 Indirectly heated multi-purpose storage cathode for electrical discharge vessels

Publications (1)

Publication Number Publication Date
GB1359582A true GB1359582A (en) 1974-07-10

Family

ID=5798602

Family Applications (1)

Application Number Title Priority Date Filing Date
GB134872A Expired GB1359582A (en) 1971-02-12 1972-01-12 Indirectly heated dispenser cathodes for electrical discharge vessels

Country Status (5)

Country Link
US (1) US3719855A (en)
DE (1) DE2106745C3 (en)
FR (1) FR2126685A5 (en)
GB (1) GB1359582A (en)
IT (1) IT947378B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004006313A (en) * 2002-04-18 2004-01-08 Seiko Epson Corp Manufacturing method of electro-optical device, electro-optical device, and electronic apparatus
CN104505321B (en) * 2014-11-18 2016-08-17 安徽华东光电技术研究所 Multi-beam cathode filament etching method
US11094493B2 (en) * 2019-08-01 2021-08-17 Lockheed Martin Corporation Emitter structures for enhanced thermionic emission

Also Published As

Publication number Publication date
DE2106745C3 (en) 1974-01-03
IT947378B (en) 1973-05-21
FR2126685A5 (en) 1972-10-06
DE2106745A1 (en) 1972-12-14
US3719855A (en) 1973-03-06
DE2106745B2 (en) 1973-06-14

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PLNP Patent lapsed through nonpayment of renewal fees