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US2530743A - Secondary emissive electric discharge tube - Google Patents

Secondary emissive electric discharge tube Download PDF

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Publication number
US2530743A
US2530743A US668531A US66853146A US2530743A US 2530743 A US2530743 A US 2530743A US 668531 A US668531 A US 668531A US 66853146 A US66853146 A US 66853146A US 2530743 A US2530743 A US 2530743A
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US
United States
Prior art keywords
electrode
discharge tube
cathode
electric discharge
electrons
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 - Lifetime
Application number
US668531A
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English (en)
Inventor
Veenemans Cornelis Frederik
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.)
Hartford National Bank and Trust Co
Original Assignee
Hartford National Bank and Trust Co
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 Hartford National Bank and Trust Co filed Critical Hartford National Bank and Trust Co
Application granted granted Critical
Publication of US2530743A publication Critical patent/US2530743A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J43/00—Secondary-emission tubes; Electron-multiplier tubes
    • H01J43/02—Tubes in which one or a few electrodes are secondary-electron emitting electrodes

Definitions

  • This invention relates to an electric discharge tube comprising one or more secondary emission electrodes, that is to say electrodes which are superficially provided with a material having the property of readily emitting secondary electrons on being struck by a primary electronic current.
  • materials of this kind are in particular the alkali metal compounds, for example caesium oxide.
  • the drawback is encountered that the secondary emissive electrode acquires too high a temperature because of the heat which is radiated from the cathode and reflected to the secondary emissive electrode by the electrode which curves the paths of the electrons.
  • the diiliculty involved may be obviated with the aid of a simple means when use is made of a discharge tube according to the invention, which tube comprises an electrode system having one or more secondary emission electrodes, the electrode system being so constructed that with the aid of an electrode having a definite shape the electrons are guided from the cathode to the secondary emission electrode along curved paths, said electrode being made from perforated material.
  • this electrode is preferably made from wire or gauze, but it is also possible to obtain the apertures in another manner, for example by utilising a punched plate.
  • this electrode has the shape of a cyclindrical mirror having a parabolic or substantially parabolic section, the primary cathode being arranged in the focal line of this mirror.
  • this construction is very advantageous for obtaining satisfactory paths of the electrons and would on the other hand be extraordinarily disadvantageous for the thermal reflection if the said electrodes were manufactured from solid material. Consequently, in this case the use of a discharge tube according to the invention offers very great advantages.
  • FIG. 1 shows diagrammatically the structure of the electrode system of a tube according to the invention.
  • Fig. 2 shows a cylindrical mirror having a parabolic section.
  • l designates a cathode surrounded by a control grid 2 and a screen grid 3.
  • the electrons passing out of the cathode are guided along the curved paths 4 to the secondary emission electrode 5, the secondary electrons passing out of the latter being collected by an anode 5.
  • These curved paths are obtained by the arrangement of an electrode i which, according to the invention, is not from solid material, but from gauze or wire. This electrode is preferably connected to a point of low potential.
  • FIG. 2 shows more clearly the shape of the electrode 1.
  • This electrode is of gauze and, as may be readily seen from the figure, exhibits the shape of a cylinder having a parabolic section. It is thus achieved that on the one hand the most advantageous conditions for the paths of the electrons are available and on the other hand the heat generated by the cathode is not reflected but may radiate freely through the meshes of the gauze.
  • An electron discharge tube comprising a primary cylindrical cathode for generating elec- UNITED STATES PATENTS trons, a secondary electron, emissive electrode, Number Name Date electron and heat shielding means interposed in 2 042,951 Marden June 2 1936 the direct paths between said cathode and the 095,337 Loppacker Oct 1937 secondary emissive electrode, and electrodes for 5 2,146,607 Overbeek 1939 directing electrons from said cathode to the sec- 2,223,001 Famsworth Nov.
  • Electrodes 26 1940 ondary emissive electrode along curved paths, 2,340,631 Overbeek 1 1944 said electrodes comprising an apertured wire gauze deflector having a cylindrical parabolic FOREIGN PATENTS shape and having the focal line thereof substan- 10 Number Country Date tially coincident with the axis of the cathode. 852,078 France Oct. 16, 1939 CORNELIS FREDERIK VEENEMANS.

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  • Discharge Lamp (AREA)
  • Electrodes For Cathode-Ray Tubes (AREA)
US668531A 1942-04-17 1946-05-09 Secondary emissive electric discharge tube Expired - Lifetime US2530743A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL614457X 1942-04-17

Publications (1)

Publication Number Publication Date
US2530743A true US2530743A (en) 1950-11-21

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ID=19788205

Family Applications (1)

Application Number Title Priority Date Filing Date
US668531A Expired - Lifetime US2530743A (en) 1942-04-17 1946-05-09 Secondary emissive electric discharge tube

Country Status (5)

Country Link
US (1) US2530743A (de)
BE (1) BE450216A (de)
DE (1) DE868028C (de)
FR (1) FR894033A (de)
GB (1) GB614457A (de)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2042951A (en) * 1930-04-05 1936-06-02 Westinghouse Lamp Co Electron discharge device
US2095337A (en) * 1934-11-14 1937-10-12 Everett P Loppacker Vacuum tube electrode
US2146607A (en) * 1937-02-23 1939-02-07 Philips Nv Secondary electron discharge device
FR852078A (fr) * 1938-03-25 1940-01-23 Philips Nv Tubes à décharges électriques
US2223001A (en) * 1939-04-24 1940-11-26 Farnsworth Television & Radio High efficiency amplifier
US2340631A (en) * 1939-06-06 1944-02-01 Adrianus J W M Van Overbeek Secondary electron amplifier

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2042951A (en) * 1930-04-05 1936-06-02 Westinghouse Lamp Co Electron discharge device
US2095337A (en) * 1934-11-14 1937-10-12 Everett P Loppacker Vacuum tube electrode
US2146607A (en) * 1937-02-23 1939-02-07 Philips Nv Secondary electron discharge device
FR852078A (fr) * 1938-03-25 1940-01-23 Philips Nv Tubes à décharges électriques
US2223001A (en) * 1939-04-24 1940-11-26 Farnsworth Television & Radio High efficiency amplifier
US2340631A (en) * 1939-06-06 1944-02-01 Adrianus J W M Van Overbeek Secondary electron amplifier

Also Published As

Publication number Publication date
BE450216A (de)
FR894033A (fr) 1944-12-12
DE868028C (de) 1953-02-23
GB614457A (en) 1948-12-15

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