US2593856A - Electric discharge tube of the kind comprising an indirectly heated cathode - Google Patents

Electric discharge tube of the kind comprising an indirectly heated cathode Download PDF

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Publication number
US2593856A
US2593856A US76884A US7688449A US2593856A US 2593856 A US2593856 A US 2593856A US 76884 A US76884 A US 76884A US 7688449 A US7688449 A US 7688449A US 2593856 A US2593856 A US 2593856A
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US
United States
Prior art keywords
discharge tube
sheath
indirectly heated
electric discharge
cathode
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
US76884A
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English (en)
Inventor
Weyer Henricus Johannes De
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
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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
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Publication of US2593856A publication Critical patent/US2593856A/en
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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
    • H01J1/22—Heaters

Definitions

  • the invention relates Vto an electric discharge tube having a cathode of the indirectly heated type comprising a cylindrical sheath in which one or more heating wires are housed and in which the space between the sheath and the heating wires, at least adjacent the ends of the cathode, is fully lled with insulating material.
  • the heating wires for such cathodes may be very thin, so that bending thereof should prove to present no diiculty, the said phenomenon is found to occur to an even marked extent.
  • the diiliculty may be obviated, if, in accordance with the invention, with an electric discharge tube comprising a cathode, of the indirectly heated type which comprises a cylindrical sheath in which one or more heating wires are provided and in which the space between sheath and heating wires, at least adjacent the ends of the cathode, is completely lled with insulating material, 5
  • the ends of the heating wires'which ends protrude from the insulating material are iiattened, at least in part, starting at a slight distance from the point at which these ends protrude from the insulating material.
  • the flattened part as distinct from the remaining part of the heating wire is found to have greater exibility such that that part of the heating wires which protrudes direct from the insulating material is no longer bent out of shape and breakage is avoided.
  • An explanation is that the material of the heating Wires which, as a rule, is comparatively brittle, may, in addition, become less brittle due to the flattening operation. Whatever the explanation oi the effect of the embodiment of the invention may be the result proves to be efficacious.
  • Fig. 1 shows a tube and Figs. 2, 3 and 4 are detail views of cathodes according to the invention.
  • I designates the bulb of a tube, which is sealed by a bottom 2 in which contact pins 3 are sealed.
  • an electrode system 4 comprising a bifurcated cathode 5 of the indirectly heated type constituted by a sheath 6 which is coated with emissive material and which forms an equipotential body (Fig. 2).
  • the sheath 6 contains insulating material 'I and a heating wire 8 which is flattened at the end at 9.
  • the flattened part 9 begins at a slight distance from the point at which the heating wire emerges from the insulating material, so that there is still a non-deformed part I0. Gwing to the great exibility of part 9, part IB does not bend, so that rupture at the area at which the wire emerges from the insulating material is prevented.
  • this end may be torsioned as is shown in Figs. 1 and 2.
  • this end may be torsioned as is shown in Figs. 1 and 2.
  • parts 9 and I3 are ilattened in directions at right angles to one another, whereas part I2 may4 remain undeformed.
  • An electron discharge tube comprising an envelope having a bulb portion and a base portion, an electrode structure including an indirectly heated cathode,b ⁇ ody'mounted in said bulb portion, an'outerconductive sheath on said cathode body, a .thin flexible heating wire in said sheath, and having an end portion extending out of said sheath at an extremity thereof, and amass-of compressed pulverulent insulatin'gjmaterial.llingf the space between said heating wire and said sheath at said extremity, a supply .conductor positioned on said base portion, said* thin;Y flexible:
  • heating wire having a iexiblecflattened portion electrically connecting said supply conductor and the said extended end portionof. said thin. ilexible heating wire.
  • An electron discharge tube comprising, an
  • An. electron discharge tube comprising an envelope.- having an bulb portion and a base portion, an electrode-,structure including an indirectly heated .Cathode body mounted in said bulb portionan outer; conductive sheath on said cathode body, a' heatinglwire in said sheath and having an end thereof extending out. of said sheath at an..
  • a mass .of compressed pulverulent insulating material filling the spacebetweensaid heating Wire and said sheath at said extremity, a supply conductor positioned on said base portion, a first flexible flattened member integral with said heating wire adjacent the said extended yend ofsa'id heating Wire; and a second iiexible flattened member integral with said heating wirefand electrically connectedlwith andextending at substantially right angles to' said-first attened member andinterposed between said first member and said supply conductor.

Landscapes

  • Solid Thermionic Cathode (AREA)
  • Gas-Filled Discharge Tubes (AREA)
  • Discharge Lamp (AREA)
US76884A 1948-03-15 1949-02-17 Electric discharge tube of the kind comprising an indirectly heated cathode Expired - Lifetime US2593856A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL270976X 1948-03-15

Publications (1)

Publication Number Publication Date
US2593856A true US2593856A (en) 1952-04-22

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ID=19781927

Family Applications (1)

Application Number Title Priority Date Filing Date
US76884A Expired - Lifetime US2593856A (en) 1948-03-15 1949-02-17 Electric discharge tube of the kind comprising an indirectly heated cathode

Country Status (7)

Country Link
US (1) US2593856A (is")
BE (1) BE487889A (is")
CH (1) CH270976A (is")
DE (1) DE809324C (is")
FR (1) FR983147A (is")
GB (1) GB676009A (is")
NL (1) NL68498C (is")

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3869692A (en) * 1973-05-07 1975-03-04 Gte Sylvania Inc Heater for vacuum tube cathode in which the wire of the heater legs has been etched to reduce its diameter

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US247097A (en) * 1881-09-13 Joseph v
US1914883A (en) * 1929-10-22 1933-06-20 Frederick G Cottrell Method and apparatus for producing ions
US1968280A (en) * 1933-05-01 1934-07-31 Grigsby Grunow Co Cathode structure
USRE19870E (en) * 1927-11-16 1936-02-25 Electron discharge device with
US2075876A (en) * 1927-12-28 1937-04-06 Electrons Inc Cathode organization
US2399402A (en) * 1941-04-08 1946-04-30 Bendix Aviat Corp Electrical connecting and radioshielding means
US2403444A (en) * 1941-05-31 1946-07-09 Bell Telephone Labor Inc Electron discharge device
US2403445A (en) * 1941-05-31 1946-07-09 Bell Telephone Labor Inc Electron discharge device

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US247097A (en) * 1881-09-13 Joseph v
USRE19870E (en) * 1927-11-16 1936-02-25 Electron discharge device with
US2075876A (en) * 1927-12-28 1937-04-06 Electrons Inc Cathode organization
US1914883A (en) * 1929-10-22 1933-06-20 Frederick G Cottrell Method and apparatus for producing ions
US1968280A (en) * 1933-05-01 1934-07-31 Grigsby Grunow Co Cathode structure
US2399402A (en) * 1941-04-08 1946-04-30 Bendix Aviat Corp Electrical connecting and radioshielding means
US2403444A (en) * 1941-05-31 1946-07-09 Bell Telephone Labor Inc Electron discharge device
US2403445A (en) * 1941-05-31 1946-07-09 Bell Telephone Labor Inc Electron discharge device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3869692A (en) * 1973-05-07 1975-03-04 Gte Sylvania Inc Heater for vacuum tube cathode in which the wire of the heater legs has been etched to reduce its diameter

Also Published As

Publication number Publication date
GB676009A (en) 1952-07-23
CH270976A (de) 1950-09-30
DE809324C (de) 1951-07-26
NL68498C (is")
FR983147A (fr) 1951-06-19
BE487889A (is")

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