US2198329A - Electric discharge tube - Google Patents

Electric discharge tube Download PDF

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Publication number
US2198329A
US2198329A US195567A US19556738A US2198329A US 2198329 A US2198329 A US 2198329A US 195567 A US195567 A US 195567A US 19556738 A US19556738 A US 19556738A US 2198329 A US2198329 A US 2198329A
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United States
Prior art keywords
discharge tube
metal
metals
electric discharge
oxide
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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 - Lifetime
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US195567A
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English (en)
Inventor
Bruining Hajo
Boer Jan Hendrik De
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RCA Corp
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RCA Corp
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Publication date
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    • 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

Definitions

  • discharge tube according to the present invention which comprises a secondaryemission electrode coated, at least on part of its surface, with a layer which is not thicker than 1 micron and which consists of one or more compounds of the alkali, alkaline earth or earth metals which do practically .not contain free metal.
  • alkali metals are meant the metals: lithium, sodium, potassium, rubidium and caesium, by alkaline earth metals the metals calcium, strontium, barium and in the present case also magnesium and by the earth metals: aluminium, scandium, yttrium, lanthanum and the rare earth metals, furthermore, zirconium, titanium, hafnium and thorium.
  • the generally accepted opinion that materials which have a satisfactory primary emission also will have the best secondary emission is incorrect but that the best secondary emission is only obtained it use is made of a layer which consists of one or more compounds in which there is practically no free metal, that is to say of a layer which would be completely unsuitable to act as a primary emitter.
  • the invention consists in the use of layers which consist or compounds which practically contain no free metal and which have a small thickness, which is necessary as theconductivity of such layers is smaller than that of layers which contain a more or less large amount of free metal.
  • diflerent materials may be utilised for the purpose above referred to, use should preferably be made of oxides, or halogenides of the alkali metals, or alkaline earth metals such, for example, as barium oxide, caesium oxide, sodium chloride, potassium chloride, sodium fluoride, sodium bromide, potassium iodide, aluminium oxide, etc.
  • the table below indicates the values of the secondary emission for the abovementioned compounds and for the pure metals.
  • the accompanying drawing illustrates diagrammatically one embodiment of myinvention as a tube comprising an envelope l enclosing a source of primary electrons, such as a thermionic cathode 2, a conventional control grid 3, an output electrode 4, and a secondary electron emitter 5 constructed in accordance with my invention and. having a layer 6 of alkaline earth oxide on the surface facing the cathode.
  • the primary electron stream fiows, as indicated by a single arrow, from the source 2 to the emitter 5, and the secondary electron stream flows, as indicated by several arrows, from the emitter 5 to the output electrode 4.
  • An electron discharge tube comprising a source of primary electrons, a collector electrode, and a secondary electron emitting electrode having on the surface exposed to said source a layer no thicker than one micron and consisting of an oxygen compound of a metal selected from the group consisting of the alkali and the alkaline earth metals and substantially. free from the metal of the compound,
  • a secondary electron emitter for an electron discharge device comprising an electrode, and a coating on said electrode thinner than one micron and consisting of an oxide of an alkali or alkaline earth metal and free from the metal of the oxide.
  • a secondary electron emitter for an electron discharge device comprising an electrode, and a coating on said electrode no thicker than one micron and consisting of an oxide of an alkaline earth metal and free from said metal.

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  • Discharge Lamp (AREA)
  • Cold Cathode And The Manufacture (AREA)
US195567A 1937-03-25 1938-03-12 Electric discharge tube Expired - Lifetime US2198329A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL207131X 1937-03-25

Publications (1)

Publication Number Publication Date
US2198329A true US2198329A (en) 1940-04-23

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ID=19778610

Family Applications (1)

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US195567A Expired - Lifetime US2198329A (en) 1937-03-25 1938-03-12 Electric discharge tube

Country Status (4)

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US (1) US2198329A (en, 2012)
BE (1) BE427143A (en, 2012)
CH (1) CH207131A (en, 2012)
FR (1) FR835633A (en, 2012)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2457947A (en) * 1942-12-21 1949-01-04 Albert G Thomas High-frequency oscillation tube
US2472189A (en) * 1941-07-03 1949-06-07 Hartford Nat Bank & Trust Co Thermionic tube having a secondary-emission electrode
US2540635A (en) * 1948-05-27 1951-02-06 Rca Corp Cesiated monoscope
US2548514A (en) * 1945-08-23 1951-04-10 Bramley Jenny Process of producing secondaryelectron-emitting surfaces
US2585534A (en) * 1945-11-07 1952-02-12 Emi Ltd Secondary electron emissive electrode and its method of making
US2600112A (en) * 1948-06-30 1952-06-10 Sylvania Electric Prod Electron emitter
US2708726A (en) * 1948-12-04 1955-05-17 Emi Ltd Electron discharge device employing secondary electron emission and method of making same
US2722490A (en) * 1950-07-24 1955-11-01 Bell Telephone Labor Inc Germanium elements and methods of preparing same
US2730640A (en) * 1951-08-08 1956-01-10 Gen Electric Secondary electron emitting system
US2802127A (en) * 1954-02-03 1957-08-06 Dobischek Dietrich Dynode coating
DE1015947B (de) * 1951-10-23 1957-09-19 Telefunken Gmbh Verstaerkerroehre mit hohem elektronischem Eingangswiderstand
US2846338A (en) * 1954-08-03 1958-08-05 William G Shepherd Secondary electron emitter
US2887597A (en) * 1955-10-27 1959-05-19 Hughes Aircraft Co Storage screen for direct-viewing storage tube
DE1078240B (de) * 1953-12-17 1960-03-24 Siemens Ag Elektronenroehre zur Verstaerkung von Signalen, z. B. nach Art einer Hexode
US3410716A (en) * 1965-04-01 1968-11-12 Trw Inc Coating of refractory metals with metal modified oxides

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE874176C (de) * 1939-03-25 1953-04-20 Sueddeutsche Telefon App Sekundaerelektronenvervielfacher mit Gluehkathode
DE857535C (de) * 1939-08-08 1952-12-01 Telefunken Gmbh Prallelektrode zur Sekundaerelektronen-Vervielfachung
DE895629C (de) * 1940-07-31 1953-11-05 Zeiss Ikon Ag Verfahren zur Herstellung von Sekundaeremissionskathoden

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2472189A (en) * 1941-07-03 1949-06-07 Hartford Nat Bank & Trust Co Thermionic tube having a secondary-emission electrode
US2457947A (en) * 1942-12-21 1949-01-04 Albert G Thomas High-frequency oscillation tube
US2548514A (en) * 1945-08-23 1951-04-10 Bramley Jenny Process of producing secondaryelectron-emitting surfaces
US2585534A (en) * 1945-11-07 1952-02-12 Emi Ltd Secondary electron emissive electrode and its method of making
US2540635A (en) * 1948-05-27 1951-02-06 Rca Corp Cesiated monoscope
US2600112A (en) * 1948-06-30 1952-06-10 Sylvania Electric Prod Electron emitter
US2708726A (en) * 1948-12-04 1955-05-17 Emi Ltd Electron discharge device employing secondary electron emission and method of making same
US2722490A (en) * 1950-07-24 1955-11-01 Bell Telephone Labor Inc Germanium elements and methods of preparing same
US2730640A (en) * 1951-08-08 1956-01-10 Gen Electric Secondary electron emitting system
DE1015947B (de) * 1951-10-23 1957-09-19 Telefunken Gmbh Verstaerkerroehre mit hohem elektronischem Eingangswiderstand
DE1078240B (de) * 1953-12-17 1960-03-24 Siemens Ag Elektronenroehre zur Verstaerkung von Signalen, z. B. nach Art einer Hexode
US2802127A (en) * 1954-02-03 1957-08-06 Dobischek Dietrich Dynode coating
US2846338A (en) * 1954-08-03 1958-08-05 William G Shepherd Secondary electron emitter
US2887597A (en) * 1955-10-27 1959-05-19 Hughes Aircraft Co Storage screen for direct-viewing storage tube
US3410716A (en) * 1965-04-01 1968-11-12 Trw Inc Coating of refractory metals with metal modified oxides

Also Published As

Publication number Publication date
CH207131A (de) 1939-09-30
BE427143A (en, 2012)
FR835633A (fr) 1938-12-27

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