US2283639A - Electric discharge device - Google Patents

Electric discharge device Download PDF

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Publication number
US2283639A
US2283639A US412377A US41237741A US2283639A US 2283639 A US2283639 A US 2283639A US 412377 A US412377 A US 412377A US 41237741 A US41237741 A US 41237741A US 2283639 A US2283639 A US 2283639A
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US
United States
Prior art keywords
discharge
container
cathode
vessel
anode
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
US412377A
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English (en)
Inventor
August J Kling
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.)
General Electric Co
Original Assignee
General Electric 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
Priority to BE473956D priority Critical patent/BE473956A/xx
Application filed by General Electric Co filed Critical General Electric Co
Priority to US412377A priority patent/US2283639A/en
Application granted granted Critical
Publication of US2283639A publication Critical patent/US2283639A/en
Priority to FR950304D priority patent/FR950304A/fr
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
    • H01J17/00—Gas-filled discharge tubes with solid cathode
    • H01J17/02—Details
    • H01J17/04—Electrodes; Screens
    • H01J17/06—Cathodes

Definitions

  • FIG. 1 is a sectional view of a discharge device suitably embodying the invention
  • FIG. 3 is a section taken on line 3-3 of Fig. 2.
  • anode l3 which is represented as being in the form of a bell-shaped body of graphite. This is cooperatively positioned with respect to a cathode structure, designated as a whole by the numeral I5.
  • an electron emitter 29 which comprises a coiled filament of tungsten or other refractory metal, preferably coated with an activating material such as an alkaline earth oxide.
  • the filament 26 is supported between appropriately positioned conduct tors 22 and 23 which are sealed through the header 18 by means of vacuum-tight seals indi cated at 24 and 25.
  • Each of these seals comprises a metal eyelet secured to the header l8 and closed at its lower extremity by means of a body of glass fused into the eyelet.
  • a further current supply conductor 28 is secured directly to the bottom of the header l8 and serves to supply current to the cathode structure as a whole.
  • the various conductors 22, 23 and 28 are sealed through the discharge vessel ill by means of a conventional stem press 39 from which the cathode structure as a whole is supported.
  • the conductive shell I! is constituted of a metal such as nickel or molybdenum which is adapted for high temperature operation and is coated on its external surface with a thermionically active material such as an alkaline earth oxide or the like so that the shell is adapted to serve as a source of electrons for producing a discharge to the anode I3.
  • the lead-in conductors associated with the heating circuit for the emitter may be of relatively small dimensions and low currentcarrying capacity. -This consideration greatly simplifies the problem of sealing these conductors into the discharge vessel It and minimizes the likelihood of fracture of the lead-in seals due tovintense localized heating.
  • a. heat shield 33 is preferably placed around the cathode shell I! so as to minimize radiation from its emitting surfaces.
  • the invention may also be used in connection with indirectly heated cathode arrangements, and one such arrangement is illustrated in Fig. 2.
  • the principal emitting surfaces of the cathode (shown as being contained within the lower portion of a discharge vessel 40) are provided by a plurality of vane structures 42 enclosed within a cylindrical heat shield 43.
  • the vanes 42 At their inner edges the vanes 42 abut against a cylindrical metallic container 45 which comprises a sealed, evacuated enclosure generally similar to the shell I! of Fig. 1.
  • the container 45 encloses a filamentary electron emitter 47 which has lead-in conductors 48 and 49 sealed through the lower end of the container.
  • heating current is passed through the filamentary emitter 4! and a discharge is established to the wall of the container 45, thereby raising the body of the container to an elevated temperature.
  • the heat thus generated is communicated by conduction and radiation to the vanes 42, thus bringing them to a temperature of effective electron emissivity.
  • the vanes 42 be coated with an emissionenhancing material such as an alkaline earth oxide.
  • a component thereof a member which forms a wall part of a highly evacuated discharge enclosure and further including an electron emitter within said enclosure for producing a heat-generating discharge to said wall part.
  • a discharge vessel containing an ionizable medium at a substantial pressure, an anode within the vessel, a cathode cooperatively positioned with respect to the anode, and means for maintaining the active parts of the cathode at a temperature of thermionic emission, said means including a cathode component which forms a wall part of a highly evacuated discharge enclosure and an electron emitter within the enclosure for producing a heatproducing discharge to the said Wall part.
  • a discharge Vessel containing an ionizable medium at a substantial pressure, an anode Within the vessel, and a thermionic cathode cooperatively positioned with respect to the anode, said cathode including a sealed, evacuated metal container extending within the said discharge vessel and an electron emitter within the container for producing a discharge to the container to maintain the cathode at a temperature of thermionic emission.
  • a discharge device comprising a closed vessel which contains a substantial quantity of an ionizable medium, an anode within the said vessel, and a cathode cooperatively positioned with respect to the anode, said cathode comprising a sealed, highly-evacuated container, a thermionic electron-emitter within the container for producing a discharge to the container of suificient intensity to maintain the container at a temperature of effective electron emissivity, and lead-in conductor sealed through the walls of both the said vessel and the said container for supplying heating current to the electron-emitter.
  • a discharge vessel containing a substantial quantity of an ionizable medium, an anode within the vessel, a sealed evac-I uated metallic container also within the vessel and cooperatively positioned with respect to the anode, said container being provided externally with an electron-emissive material whereby it is enabled to function as a cathode, and an electron emitter within the eva'cuated space enclosed by the container for producing a heat-generating discharge therein of suflicient intensity to maintain the said emissive material at a temperature of effective thermionic emission 6.
  • a discharge device comprising a closed vessel which contains a substantial quantity of an ionizable medium, an anode within the vessel, a cathode comprising extended electron-emitting surfaces cooperatively positioned with respect to the anode, and means for maintaining the said surfaces at a. temperature of thermionic emissivity, said means comprising a sealed evacuated metal container in effective heat-exchanging relation with the said surfaces, and an electron emitter within the vacuum space enclosed by the container for producing a heat-generating discharge to the container.

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  • Electron Sources, Ion Sources (AREA)
US412377A 1941-09-26 1941-09-26 Electric discharge device Expired - Lifetime US2283639A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
BE473956D BE473956A (enrdf_load_stackoverflow) 1941-09-26
US412377A US2283639A (en) 1941-09-26 1941-09-26 Electric discharge device
FR950304D FR950304A (fr) 1941-09-26 1946-10-22 Perfectionnements aux tubes à décharge

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US412377A US2283639A (en) 1941-09-26 1941-09-26 Electric discharge device

Publications (1)

Publication Number Publication Date
US2283639A true US2283639A (en) 1942-05-19

Family

ID=23632744

Family Applications (1)

Application Number Title Priority Date Filing Date
US412377A Expired - Lifetime US2283639A (en) 1941-09-26 1941-09-26 Electric discharge device

Country Status (3)

Country Link
US (1) US2283639A (enrdf_load_stackoverflow)
BE (1) BE473956A (enrdf_load_stackoverflow)
FR (1) FR950304A (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2443324A (en) * 1942-11-07 1948-06-15 Charles Schiffman Electronic tube
US2450009A (en) * 1942-05-22 1948-09-28 Standard Telephones Cables Ltd Multiple stage thermionic valve
US2953701A (en) * 1957-09-05 1960-09-20 High Voltage Engineering Corp Sealed-off diode with electron emitting anode
US3250893A (en) * 1963-10-01 1966-05-10 Union Carbide Corp Method for providing a source of heat

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2450009A (en) * 1942-05-22 1948-09-28 Standard Telephones Cables Ltd Multiple stage thermionic valve
US2443324A (en) * 1942-11-07 1948-06-15 Charles Schiffman Electronic tube
US2953701A (en) * 1957-09-05 1960-09-20 High Voltage Engineering Corp Sealed-off diode with electron emitting anode
US3250893A (en) * 1963-10-01 1966-05-10 Union Carbide Corp Method for providing a source of heat

Also Published As

Publication number Publication date
BE473956A (enrdf_load_stackoverflow)
FR950304A (fr) 1949-09-23

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