GB517743A - Improvements in electric discharge tubes comprising secondaryemission electrodes - Google Patents

Improvements in electric discharge tubes comprising secondaryemission electrodes

Info

Publication number
GB517743A
GB517743A GB23310/38A GB2331038A GB517743A GB 517743 A GB517743 A GB 517743A GB 23310/38 A GB23310/38 A GB 23310/38A GB 2331038 A GB2331038 A GB 2331038A GB 517743 A GB517743 A GB 517743A
Authority
GB
United Kingdom
Prior art keywords
oxide
caesium
layer
reduced
aug
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
GB23310/38A
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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 Philips Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Publication of GB517743A publication Critical patent/GB517743A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H01J9/12—Manufacture of electrodes or electrode systems of photo-emissive cathodes; of secondary-emission electrodes
    • H01J9/125—Manufacture of electrodes or electrode systems of photo-emissive cathodes; of secondary-emission electrodes of secondary emission electrodes
    • 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
    • H01J1/32—Secondary-electron-emitting electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2201/00—Electrodes common to discharge tubes
    • H01J2201/32—Secondary emission electrodes

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Discharge Lamp (AREA)
  • Spark Plugs (AREA)

Abstract

517,743. Electron multipliers. NAAMLOOZE VENNOOTSCHAP PHILIPS GLOEILAMPENFABRIEKEN. Aug. 6, 1938, No. 23310. Convention date, Aug. 9, 1937. [Class 39 (i)] A secondary emitting electrode comprises a layer of oxide on a core material and a sensitive layer of an alkali compound practically free from alkali metal on the oxide. In manufacture an oxide such as tungsten, molybdenum, tin, nickel or cuprous oxide is formed as a layer on a base ; raised to a temperature of 150‹-200‹ C. it is brought into contact with caesium vapour, care being taken that only a part of the oxide layer is reduced by the caesium. In working with say a barium thermionic cathode or a caesium caesium photoelectric cathode-if the caesium oxide of the secondary emitting layer is reduced the metal oxide again oxidizes the reduced caesium. Specification 492,250 is referred to.
GB23310/38A 1937-08-09 1938-08-06 Improvements in electric discharge tubes comprising secondaryemission electrodes Expired GB517743A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL208243X 1937-08-09

Publications (1)

Publication Number Publication Date
GB517743A true GB517743A (en) 1940-02-07

Family

ID=19778672

Family Applications (1)

Application Number Title Priority Date Filing Date
GB23310/38A Expired GB517743A (en) 1937-08-09 1938-08-06 Improvements in electric discharge tubes comprising secondaryemission electrodes

Country Status (5)

Country Link
BE (1) BE429592A (en)
CH (1) CH208243A (en)
DE (1) DE737996C (en)
FR (1) FR841828A (en)
GB (1) GB517743A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2526574A (en) * 1947-06-14 1950-10-17 Bell Telephone Labor Inc Secondary emitter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2526574A (en) * 1947-06-14 1950-10-17 Bell Telephone Labor Inc Secondary emitter

Also Published As

Publication number Publication date
CH208243A (en) 1940-01-15
FR841828A (en) 1939-05-31
DE737996C (en) 1943-08-02
BE429592A (en)

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