US2873518A - Wire electrode for electric discharge lamps - Google Patents

Wire electrode for electric discharge lamps Download PDF

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Publication number
US2873518A
US2873518A US487926A US48792655A US2873518A US 2873518 A US2873518 A US 2873518A US 487926 A US487926 A US 487926A US 48792655 A US48792655 A US 48792655A US 2873518 A US2873518 A US 2873518A
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US
United States
Prior art keywords
wire
electrode
wire electrode
discharge lamps
electric discharge
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
US487926A
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English (en)
Inventor
Schilling Werner
Bahrs Siegfried
Wiedenmann Hans
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.)
Osram GmbH
Original Assignee
Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
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
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Application filed by Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH filed Critical Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
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Publication of US2873518A publication Critical patent/US2873518A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/02—Manufacture of electrodes or electrode systems
    • H01J9/04—Manufacture of electrodes or electrode systems of thermionic cathodes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12333—Helical or with helical component

Definitions

  • FIG. 2 WIRE ELECTRODE FOR ELECTRIC DISCHARGE LAMPS Filed Feb. 14, 1955 FIG. 2
  • Our invention relates to a wire electrode for electric vapor or gaseous discharge lamps which electrode is provided with emission material.
  • emission material In case of such electrodes it is important to increase the receiving capacity for emission materials of the electrode wires consisting generally of tungsten or molybdenum.
  • electronemitting material consists of alkaline earth metallic oxides to which are added, for instance, compounds of elements of the 4th and th group of the periodic table.
  • Such an electrode can be a straight wire or it can consist of a wire which is coiled to a single coil or, if desired, to a multiple coil. In such a case the emission material sits predominantly between the windings of the inner coil which is wound with interspaces.
  • An object of our invention is to provide the Wire with such a surface that a greater quantity of emission material adheres safely to it.
  • the wire should be provided with a very rough surface which has cracks 3:151 spaces serving for holding fast the emission matell
  • this latter purpose is obtained in such a manner that a wire produced of sintered metallic powders, preferably of tungsten or molybdenum, and having a fiber structure is distorted over its whole length, i. e. to such a degree that there are formed cracks and spaces on the wire surface in consequence of a separation of the crystal fibers.
  • FIG. 1 shows a wire electrode of well-known art consisting of straight wire.
  • Fig. 2 shows a corresponding wire electrode according to the present invention.
  • Fig. 3 shows an electrode of coiled wire of well-known art, and
  • Fig. 4 shows a corresponding coiled electrode made of a wire which is treated according to the present invention.
  • the distorted Wire is coiled to a single or to a multiple coil but attention should be paid to the necessity that the little orsion caused by the coiling itself be not directed against the original strong torsion because the proportionately fragile wire could then break.
  • Fig. 4 shows an electrode the wire of Which distorted as described in the present invention has been coiled after distortion. It is clearly to be seen that the outer fibers 7 are running in a helical form around the wire. In contrast thereto Fig. 3 shows a coiled electrode consisting of a well-known non-distorted wire. There the outer fibers 6 are running nearly in the direction of the wire axis.
  • the emission material is applied to the wire electrode in such a manner that it is contained principally on the wire surface and in the gaps between the outer fibers of the wire which gaps are caused by the distortion, and perhaps in the spaces within the coil Wound at first which has a small coiling diameter, i. e. within the primary coil. It has been found that the emission material applied in the above mentioned manner is held fast in a sufficient quantity to supply electrons during 10,000 and more operating hours and to increase the life of those lamps provided with these electrodes by 50 and more percent.
  • a method of manufacturing a wire electrode which method consists in sintering metallic powders selected from the group consisting of tungsten and molybdenum to produce a rod or wire, reducing and elongating said wire to produce a fiber structure of the wire crystals parallel to the longitudinal axis of the wire, distorting the wire along its longitudinal axis at a simultaneous heating up to 250 C. so that the outer fibers of the Wire are running against its axis within an angle of 15 to 70 whereby cracks and spaces are formed by separation of the crystal fibers on 'the wire surface over its whole length, thereby forming a rough surface to which the emission material can well adhere.
  • a method of manufacturing a wire electrode which method consists in sintering metallic powders selected from the group consisting of tungsten and molybdenum to produce a rod or Wire, reducing and elongating said wire to produce a fiber structure of the Wire crystals parallel to the longitudinal axis of the wire, distorting the wire along its longitudinal axis at a simultaneous heating up to 250 C. so that the outer fibers of the wire are running against its axis within an angle of 15 to 70 whereby cracks and spaces are formed by separation of the czystalfibers on the, wire surface.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Discharge Lamp (AREA)
US487926A 1954-02-26 1955-02-14 Wire electrode for electric discharge lamps Expired - Lifetime US2873518A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEP11394A DE960561C (de) 1954-02-26 1954-02-26 Drahtelektrode fuer elektrische Dampf- und/oder Gasentladungslampen und Verfahren zu ihrer Herstellung

Publications (1)

Publication Number Publication Date
US2873518A true US2873518A (en) 1959-02-17

Family

ID=6183469

Family Applications (1)

Application Number Title Priority Date Filing Date
US487926A Expired - Lifetime US2873518A (en) 1954-02-26 1955-02-14 Wire electrode for electric discharge lamps

Country Status (5)

Country Link
US (1) US2873518A (enrdf_load_stackoverflow)
BE (1) BE535889A (enrdf_load_stackoverflow)
CH (1) CH326003A (enrdf_load_stackoverflow)
DE (1) DE960561C (enrdf_load_stackoverflow)
GB (1) GB764160A (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3232717A (en) * 1962-05-14 1966-02-01 Gen Motors Corp Uranium monocarbide thermionic emitters
US4594218A (en) * 1983-10-18 1986-06-10 Alsthom-Atlantique, S.A. Method of producing multifilament lengths of superconductor from ternary chalcogenides of molybdenum

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1602526A (en) * 1922-09-15 1926-10-12 Westinghouse Lamp Co Control of crystal development in refractory metals
US1722468A (en) * 1924-04-05 1929-07-30 Forest Radio Telephone & Teleg Electron-discharge device
US2060441A (en) * 1934-03-29 1936-11-10 Albert M Ross Welding rod for arc welding
US2177703A (en) * 1936-11-25 1939-10-31 Gen Electric Electric gaseous discharge device
US2249672A (en) * 1936-12-10 1941-07-15 Gen Electric Discharge device
US2353635A (en) * 1941-02-11 1944-07-18 Gen Electric Cathode for discharge tubes
US2363028A (en) * 1941-12-16 1944-11-21 Carl J Warnke Cathode filament
US2450007A (en) * 1942-11-23 1948-09-28 Standard Telephones Cables Ltd Carburized filament and method for treating the same
US2625666A (en) * 1950-02-27 1953-01-13 Eitel Mccullough Inc Filament for electron tubes
US2749467A (en) * 1951-05-17 1956-06-05 Gen Electric Electrode construction

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE654918C (de) * 1935-04-21 1938-01-04 Osram G M B H Komm Ges Verfahren zur Herstellung von Elektroden fuer elektrische Entladungsgefaesse, insbesondere Entladungslampen
DE692705C (de) * 1936-09-15 1940-06-25 Siemens Schuckertwerke Akt Ges Gluehkathode fuer gas- oder dampfgefuellte Entladungsgefaesse
BE496607A (enrdf_load_stackoverflow) * 1947-04-29
CH290128A (de) * 1951-02-02 1953-04-15 Lumalampan Ab Elektrode für elektrische Niederdruck-Entladungsröhren.

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1602526A (en) * 1922-09-15 1926-10-12 Westinghouse Lamp Co Control of crystal development in refractory metals
US1722468A (en) * 1924-04-05 1929-07-30 Forest Radio Telephone & Teleg Electron-discharge device
US2060441A (en) * 1934-03-29 1936-11-10 Albert M Ross Welding rod for arc welding
US2177703A (en) * 1936-11-25 1939-10-31 Gen Electric Electric gaseous discharge device
US2249672A (en) * 1936-12-10 1941-07-15 Gen Electric Discharge device
US2353635A (en) * 1941-02-11 1944-07-18 Gen Electric Cathode for discharge tubes
US2363028A (en) * 1941-12-16 1944-11-21 Carl J Warnke Cathode filament
US2450007A (en) * 1942-11-23 1948-09-28 Standard Telephones Cables Ltd Carburized filament and method for treating the same
US2625666A (en) * 1950-02-27 1953-01-13 Eitel Mccullough Inc Filament for electron tubes
US2749467A (en) * 1951-05-17 1956-06-05 Gen Electric Electrode construction

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3232717A (en) * 1962-05-14 1966-02-01 Gen Motors Corp Uranium monocarbide thermionic emitters
US4594218A (en) * 1983-10-18 1986-06-10 Alsthom-Atlantique, S.A. Method of producing multifilament lengths of superconductor from ternary chalcogenides of molybdenum

Also Published As

Publication number Publication date
CH326003A (de) 1957-11-30
GB764160A (en) 1956-12-19
DE960561C (de) 1957-03-21
BE535889A (enrdf_load_stackoverflow)

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