GB498792A - Improved method of making an electric discharge tube comprising a secondary-emission electrode - Google Patents

Improved method of making an electric discharge tube comprising a secondary-emission electrode

Info

Publication number
GB498792A
GB498792A GB9451/38A GB945138A GB498792A GB 498792 A GB498792 A GB 498792A GB 9451/38 A GB9451/38 A GB 9451/38A GB 945138 A GB945138 A GB 945138A GB 498792 A GB498792 A GB 498792A
Authority
GB
United Kingdom
Prior art keywords
metal
compound
evaporated
magnesium
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.)
Expired
Application number
GB9451/38A
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 GB498792A publication Critical patent/GB498792A/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)
  • Gas-Filled Discharge Tubes (AREA)
  • Solid Thermionic Cathode (AREA)

Abstract

498,792. Electrode materials. NAAMLOOZE VENNOOTSCHAP PHILIPS' GLOEILAMPENFABRIEKEN. March 28, 1938, No. 9451. Convention date, March 30, 1937. [Class 39 (i)] A secondary-electron-emitting electrode comprises a compound, not containing free metal, of an alkali metal, an alkaline earth metal, magnesium or aluminium and is prepared by evaporating the metal or a compound in a gaseous atmosphere. When the metal is evaporated, the gas must be chosen to react with the metal so that the desired compound is deposited. When a compound is evaporated the gas may be inert, such as argon or nitrogen, or active, when deposited compound is different from that evaporated. The tube shown comprises a cathode 2, control grid 3 and screen grid 4, producing two streams of electrons which are directed by screens 8, 9 upon the secondary-emission electrode 6 and anode 7. The screen 8 is sprayed with a layer 10 of strontium and barium carbonates and screen 9 carries magnesium 11. When the electrodes are heated by induction, the layer 10 decomposes and produces an atmosphere of carbon dioxide, through which the magnesium evaporates to form a deposit of magnesium oxide on the electrode 6 which mixes with barium and strontium oxides evaporated from layer 10 to form a surface of high secondary emission.
GB9451/38A 1937-03-30 1938-03-28 Improved method of making an electric discharge tube comprising a secondary-emission electrode Expired GB498792A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL207921X 1937-03-30

Publications (1)

Publication Number Publication Date
GB498792A true GB498792A (en) 1939-01-13

Family

ID=19778652

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9451/38A Expired GB498792A (en) 1937-03-30 1938-03-28 Improved method of making an electric discharge tube comprising a secondary-emission electrode

Country Status (7)

Country Link
US (1) US2159774A (en)
BE (1) BE427228A (en)
CH (1) CH207921A (en)
DE (1) DE747205C (en)
FR (1) FR835838A (en)
GB (1) GB498792A (en)
NL (1) NL50262C (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE477661A (en) * 1939-02-03
DE914418C (en) * 1939-02-19 1954-07-01 Fernseh Gmbh Discharge tubes with a secondary emitting insulating surface
FR857575A (en) * 1939-02-27 1940-09-19 Materiel Telephonique Electronic discharge devices and circuits using them
DE895629C (en) * 1940-07-31 1953-11-05 Zeiss Ikon Ag Process for the manufacture of secondary emission cathodes
US2422088A (en) * 1944-04-03 1947-06-10 Rca Corp Electronic discriminator
FR958107A (en) * 1945-10-24 1950-03-03
GB683061A (en) * 1948-01-24 1952-11-19 Emi Ltd Improvements relating to thermionic valves utilising secondary electron emission amplification
US2792273A (en) * 1954-01-14 1957-05-14 Gen Electric Oxide coated nickel cathode and method of activation
US2878093A (en) * 1955-02-14 1959-03-17 Univ Minnesota Method of preparing emitter surfaces

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT101557B (en) * 1923-04-11 1925-11-10 Philips Nv Discharge tube.
BE359997A (en) * 1928-05-14
GB443214A (en) * 1934-08-20 1936-02-20 Albert Karl Franz Patin Improved method of applying coatings of alkali or alkaline earth metals

Also Published As

Publication number Publication date
CH207921A (en) 1939-12-15
BE427228A (en)
DE747205C (en) 1944-09-15
FR835838A (en) 1939-01-04
NL50262C (en)
US2159774A (en) 1939-05-23

Similar Documents

Publication Publication Date Title
GB498792A (en) Improved method of making an electric discharge tube comprising a secondary-emission electrode
US3389288A (en) Gettering device including a getter metal and a gas releasing material
US3197662A (en) Transmissive spongy secondary emitter
US2041802A (en) Electron emitter
US2173258A (en) Active metal compound for vacuum tubes
US2224324A (en) Electric discharge tube
US2175696A (en) Electron emitter
US2242644A (en) Luminescent screen
US1926846A (en) Electrode for electron discharge devices
US2178238A (en) Electric discharge device
GB302307A (en) Improvements relating to electron discharge apparatus
GB496556A (en) Improvements in electrodes for electron discharge devices
US2228945A (en) Electric discharge tube
US3388955A (en) Process for producing within electron tubes,in particular television picture tubes,a thin metallic film capable of sorbing their residual gases
US1552310A (en) Electrode for discharge tubes
US1921066A (en) Cathode for electron discharge devices and method of making the same
US1752747A (en) Electron-discharge device and getter therefor
GB449230A (en) Improvements in or relating to electrodes having photo-electric emission properties
US2171230A (en) Insulating coating
DE559817C (en) Gas-filled discharge tube
US1849594A (en) Oxide cathode
US2190695A (en) Secondary electron emitter and method of making it
US3427492A (en) Discharge tube satisfactorily low in radio-interfering noise
US2116432A (en) Getter for vacuum devices
US1964506A (en) Method of introducing active metal into electric discharge devices