US2951171A - High-pressure electric discharge tube - Google Patents

High-pressure electric discharge tube Download PDF

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Publication number
US2951171A
US2951171A US749993A US74999358A US2951171A US 2951171 A US2951171 A US 2951171A US 749993 A US749993 A US 749993A US 74999358 A US74999358 A US 74999358A US 2951171 A US2951171 A US 2951171A
Authority
US
United States
Prior art keywords
electrode
discharge tube
electric discharge
pressure electric
emissive material
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
US749993A
Other languages
English (en)
Inventor
Holmes Thomas
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.)
US Philips Corp
North American Philips Co Inc
Original Assignee
US Philips Corp
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 US Philips Corp filed Critical US Philips Corp
Application granted granted Critical
Publication of US2951171A publication Critical patent/US2951171A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/43—Solvents
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/04—Electrodes; Screens; Shields
    • H01J61/06—Main electrodes
    • H01J61/073—Main electrodes for high-pressure discharge lamps
    • H01J61/0732—Main electrodes for high-pressure discharge lamps characterised by the construction of the electrode

Definitions

  • the cylindrical bore of the electrode opens into a space the sectional area of which exceeds that of the bore, provision being made in this space of a material having a higher electron emision than the material of the hollow electrode body, it has been found that the emissivity of this electrode may cease or at least fall off materially before the supply of emissive material is spent.
  • This member may be a helically coiled metal wire. If desired, it may be a double helix comprising two layers.
  • reference numeral 1 denotes a substantially spherical quartz discharge tube having an inside diameter of about 20 mms; it is iilled with xenon at a pressure of about atms. at room temperature.
  • Tungsten electrodes 20 and 30 are provided in line with each other in the vertical axis of the discharge tube with a relative spacing of about 2 mms.
  • the electrode ends facing each other are provided with conical cavities 21 and 31 which at their apices merge into cylindrical bores 22 and 32.
  • Tungsten current supply leads 23 and 33 are connected to the electrodes by sleeves 24 and 34 respectively each comprising two layers of helically coiled tungsten wire with engaging turns.
  • each electrode In the spaces bounded by each electrode, a current supply lead and a sleeve, provision is made of an emissive material. A member which is in contact with the cylindrical bore is in contact with the emissive material also.
  • the said member consists of a helically coiled tungsten wire 37 having a diameter of about microns one end of which is immersed in the supply of emissive material 38 while the other end engages the wall of the cylindrical bore 32.
  • the upper turns of the helical wire may have a larger pitch than the lower turns.
  • This member promotes the migration of the emissive material to the cylindrical bore so that the emissivity of the electrode is less likely to cease prematurely than without the provision of such a member.
  • the helix 37 is provided -by winding back the wire with a second layer 39 which extends to the lower end -face of the electrode body 30.
  • This double helix has the advantage of holding more emissive material than a single helix.
  • This emissive material may be a mixture of barium oxide and thorium oxide.
  • the tubev was operated with alternating current of about 9' amps. with a tube voltage of about 18 volts. The discharge was quiet. At a current strength exceeding about 2 amps. there were no focal spots. The life was about 500 operating hours, the decrease of the luminous flux being about 25%.
  • the diameters of the electrode 20 and the current supply lead 23 were about 2 mms., the diameters of the electrode 30 and the current supply lead 33 about 1.4 mms., the diameter of the bore 22 about 0.8 mm. and that of the bore 32 about 0.5 mm.
  • the conical cavities 21 and 31 had apical angles of about 120.
  • the axial spacing between each electrode 'and its associated current supply lead was about 2 mms.
  • a high-pressure electric discharge tube adapted to operate without a focal spot comprising a light-transmissible envelope, an inert gas filling said envelope at a pressure of several atmospheres, a pair of axially aligned spaced conductive electrodes within said envelope, the
  • the electrodes being small compared with the ldiameter of the envelope, at least one of said electrodes having a conical depression the base of which faces the other electrode and the apex of which lies within and on the axis of said electrode, said electrode also having, an axial cylindrical recess extending from the apex of said conical depression into a chamber in the electrode having la sectional area exceeding that of the recess and which is at least partially lled with a material having a higher electron emission than the material of said electrode, and a helically coiled metal wire in contact with the wall of said recess and the emissive material to facilitate constant migration of emissive material into said recess.
  • a lamp as claimed in claim 1 in which the wire is wound in a double helix having two layers.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Discharge Lamp (AREA)
US749993A 1957-08-10 1958-07-21 High-pressure electric discharge tube Expired - Lifetime US2951171A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL219805A NL99793C (ja) 1957-08-10 1957-08-10

Publications (1)

Publication Number Publication Date
US2951171A true US2951171A (en) 1960-08-30

Family

ID=42270268

Family Applications (1)

Application Number Title Priority Date Filing Date
US749993A Expired - Lifetime US2951171A (en) 1957-08-10 1958-07-21 High-pressure electric discharge tube

Country Status (5)

Country Link
US (1) US2951171A (ja)
DE (1) DE1084374B (ja)
FR (1) FR1201219A (ja)
GB (1) GB854752A (ja)
NL (1) NL99793C (ja)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3258632A (en) * 1966-06-28 Shielded cathode
US3419947A (en) * 1965-12-10 1969-01-07 Gen Electric Compact source discharge lamp manufacture
US3989973A (en) * 1971-01-02 1976-11-02 Siemens Aktiengesellschaft Cold-cathode gas-discharge device
US20060238127A1 (en) * 2003-08-11 2006-10-26 Koninklijke Philips Electronics N.V. High-pressure discharge lamp
US20080315769A1 (en) * 2007-06-25 2008-12-25 Agoston Boroczki High intensity discharge lamp with enhanced dimming characteristcs
JP2011077057A (ja) * 2003-01-16 2011-04-14 Patent Treuhand Ges Elektr Gluehlamp Mbh 高圧放電ランプのための電極

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL296949A (ja) * 1963-08-21
NL296948A (ja) * 1963-08-21

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2304412A (en) * 1939-10-04 1942-12-08 Gen Electric Electric high pressure discharge lamp
US2821647A (en) * 1951-08-09 1958-01-28 Gen Electric High pressure metal vapor lamp
US2887603A (en) * 1956-02-24 1959-05-19 Philips Corp Compact source lamp

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE880360C (de) * 1943-07-14 1953-06-22 Patra Patent Treuhand Elektrische kugelfoermige Hochdruckentladungslampe
DE887979C (de) * 1944-06-25 1953-08-27 Quarzlampen Gmbh Durch die Entladung aufgeheizte Elektrode fuer elektrische Entladungslampen, insbesondere Quecksilberhochdrucklampen
DE1740085U (de) * 1953-03-06 1957-02-21 Felix Dr Ing Mueller Elektrode fuer entladungsgefaesse.

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2304412A (en) * 1939-10-04 1942-12-08 Gen Electric Electric high pressure discharge lamp
US2821647A (en) * 1951-08-09 1958-01-28 Gen Electric High pressure metal vapor lamp
US2887603A (en) * 1956-02-24 1959-05-19 Philips Corp Compact source lamp

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3258632A (en) * 1966-06-28 Shielded cathode
US3419947A (en) * 1965-12-10 1969-01-07 Gen Electric Compact source discharge lamp manufacture
US3989973A (en) * 1971-01-02 1976-11-02 Siemens Aktiengesellschaft Cold-cathode gas-discharge device
JP2011077057A (ja) * 2003-01-16 2011-04-14 Patent Treuhand Ges Elektr Gluehlamp Mbh 高圧放電ランプのための電極
US20060238127A1 (en) * 2003-08-11 2006-10-26 Koninklijke Philips Electronics N.V. High-pressure discharge lamp
US7423379B2 (en) 2003-08-11 2008-09-09 Koninklijke Philips Electronics, N.V. High-pressure gas discharge lamp having tubular electrodes
US20080315769A1 (en) * 2007-06-25 2008-12-25 Agoston Boroczki High intensity discharge lamp with enhanced dimming characteristcs
DE112008001624T5 (de) 2007-06-25 2010-05-12 General Electric Co. Hochintensitätsentladungslampe mit verbesserten Dimmeigenschaften
US8460045B2 (en) 2007-06-25 2013-06-11 General Electric Company High intensity discharge lamp with enhanced dimming characteristcs

Also Published As

Publication number Publication date
GB854752A (en) 1960-11-23
FR1201219A (fr) 1959-12-29
NL99793C (ja) 1961-11-15
DE1084374B (de) 1960-06-30

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