US1941692A - Indirectly heated cathode - Google Patents

Indirectly heated cathode Download PDF

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Publication number
US1941692A
US1941692A US308403A US30840328A US1941692A US 1941692 A US1941692 A US 1941692A US 308403 A US308403 A US 308403A US 30840328 A US30840328 A US 30840328A US 1941692 A US1941692 A US 1941692A
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US
United States
Prior art keywords
heater
indirectly heated
heated cathode
cathode
screen
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
US308403A
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English (en)
Inventor
Jobst Gunther
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.)
Telefunken AG
Original Assignee
Telefunken 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 Telefunken AG filed Critical Telefunken AG
Application granted granted Critical
Publication of US1941692A publication Critical patent/US1941692A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

Definitions

  • the present invention is concerned with a new screen and 3 the heater wire. 4 designates the thus distortions in reproduction.
  • this inconvenience is obviated by that the heater element is screened from the emitting surface or film.
  • the resistor heated by the alternating current is wholly or partly surrounded by a tubular metallic screen, such as a metallic hose or grate in such a manner that the heater wire is shielded from the emitting cathode or filament layer and the other electrodes.
  • the disturbing action of the alternating current is entirely elimi nated by virtue of the fact that the said protective hose is brought out of the tube and connected to a definite potential, so that electrostatic coupling between the active filament and the grid and the plate is avoided.
  • Another scheme would be to bring both ends out of the tube and to compensate the harmful potential fluctuations by a convenient direct current or alternating current potential.
  • the single figure is a fragmentary diagrammatic view of a specific embodiment of this invention.
  • 1 denotes the active coating of the cathode
  • 2 the insulated protective metallic protector tube or metallic hose which forms a continuation of the screen 2 at each end thereof according to this invention, the metallic protector tubes being brought out of the tube, and containing the heater wire supply leads which are insulated therefrom by means of glass or quartz beads 5.
  • 6 is a control grid which is disposed spirally about the heater in well known manner.
  • the coating 1 may be deposited directly upon the tube 4. I therefore do not intend to be limited except as defined in the appended claims.
  • An indirectly heated cathode for an electron discharge device comprising a rectilinear heater element, a tubular electron emitting member surrounding and spaced from said heater element, a tubular metallic screen interposed between said heater and said electron emitting member and separated from both the heater and the electron emitting member by vacuous space, and insulating means at each end of the tubular screen for maintaining said heater element in spaced relation with respect to said tubular screen.
  • An indirectly heated cathode for an electron discharge device comprising a heater element, a pair of lead-in conductors connected to the heater terminals, a cathode sleeve substantially coextensive with and surrounding the heater, a tubular metallic screen interposed between said heater and said cathode sleeve and separated from each by vacuous space, said tubular metallic screen extending beyond the heater terminals and separately enclosing each of the heater lead-in conductors.

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  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
  • Measuring Fluid Pressure (AREA)
  • Hybrid Cells (AREA)
US308403A 1927-10-21 1928-09-26 Indirectly heated cathode Expired - Lifetime US1941692A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE299325X 1927-10-21

Publications (1)

Publication Number Publication Date
US1941692A true US1941692A (en) 1934-01-02

Family

ID=6091220

Family Applications (1)

Application Number Title Priority Date Filing Date
US308403A Expired - Lifetime US1941692A (en) 1927-10-21 1928-09-26 Indirectly heated cathode

Country Status (4)

Country Link
US (1) US1941692A (enrdf_load_html_response)
BE (1) BE354919A (enrdf_load_html_response)
FR (1) FR661967A (enrdf_load_html_response)
GB (1) GB299325A (enrdf_load_html_response)

Also Published As

Publication number Publication date
GB299325A (en) 1929-10-31
FR661967A (fr) 1929-08-01
BE354919A (enrdf_load_html_response)

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