EP1439567B1 - Elektrode für eine Hochdruckentladungslampe - Google Patents

Elektrode für eine Hochdruckentladungslampe Download PDF

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Publication number
EP1439567B1
EP1439567B1 EP03029105A EP03029105A EP1439567B1 EP 1439567 B1 EP1439567 B1 EP 1439567B1 EP 03029105 A EP03029105 A EP 03029105A EP 03029105 A EP03029105 A EP 03029105A EP 1439567 B1 EP1439567 B1 EP 1439567B1
Authority
EP
European Patent Office
Prior art keywords
electrode
vessel
emitter
curvature
collar part
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
EP03029105A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1439567A3 (de
EP1439567A2 (de
Inventor
Jörg Alexander Gilles
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
Publication date
Application filed by Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH filed Critical Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
Publication of EP1439567A2 publication Critical patent/EP1439567A2/de
Publication of EP1439567A3 publication Critical patent/EP1439567A3/de
Application granted granted Critical
Publication of EP1439567B1 publication Critical patent/EP1439567B1/de
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
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/12—Selection of substances for gas fillings; Specified operating pressure or temperature
    • H01J61/18—Selection of substances for gas fillings; Specified operating pressure or temperature having a metallic vapour as the principal constituent
    • H01J61/22—Selection of substances for gas fillings; Specified operating pressure or temperature having a metallic vapour as the principal constituent vapour of an alkali metal
    • 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
    • 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
    • H01J61/067—Main electrodes for low-pressure discharge lamps
    • H01J61/0672—Main electrodes for low-pressure discharge lamps characterised by the construction of the electrode

Definitions

  • the invention is based on an electrode for a high-pressure discharge lamp according to the preamble of claim 1.
  • electrodes for high-pressure discharge lamps which contain sodium, in particular high-pressure sodium lamps.
  • Another field of application are, for example, pure Hg high-pressure discharge lamps.
  • the US-A 2,887,603 shows a high-pressure discharge lamp with an electrode rod made of tungsten, which has at its discharge-side end a conical recess, at the top of which a hole filled with an emitter hole is provided.
  • the emitters used in discharge lamps show in operation a high mobility in the discharge vessel, in particular caused by sputtering.
  • the emitter substances therefore beat down over time on all walls of the discharge vessel. They also have a lasting effect on the chemical and physical processes during lamp operation, in particular they can change the filling. Overall, therefore, the useful life of the lamp is shortened.
  • the emitter and its reservoir is located in a safe place where it is not exposed to a sputtering process.
  • the emitter material that lowers the electron work function often an oxide or an oxidic material such as Ba, Ca, Y tungstate, is introduced into open, centric or acentric bores located at the arc end of the electrode, either in the core pin, in particular survives, or in the head of the electrode itself, are.
  • an oxide or an oxidic material such as Ba, Ca, Y tungstate
  • the emitter-filled body may be conventionally provided with an outer winding of refractory metal.
  • the winding can be single or multi-layered. This winding can serve as a bow approach and gives a higher heat capacity.
  • a refractory metal usually tungsten, tantalum, rhenium or an alloy or a carbide of these metals is used.
  • the electrode is held in the discharge vessel by a power supply and led out of a discharge vessel.
  • the electrode according to the invention can be used both in all cylindrically symmetrical ceramic and in glass-made discharge vessels for high-pressure discharge lamps.
  • the work function lowering emitter material is thereby introduced into an open hole which is located at the arc end of the electrode.
  • the emitter material can be a pellet, ie a solid. but also the use of a liquid or paste is possible, with a simple admission by immersion bath treatment is possible. A second step is then the formation, if necessary. This depends on whether the emitter is oxidic or not.
  • the borehole is surrounded by a collar, which preferably has a defined inner and outer radius. These are chosen so that the approach of the discharge arc preferably takes place on the outer part of the collar.
  • the inner part, which forms the borehole edge, must be made sufficiently free of burrs.
  • the surface of the emitter material is preferably concave in the borehole.
  • the diameter, the depth and the centricity of the emitter-filled inner volume, preferably embodied as a borehole, are preferably chosen such that both a violation of the core pin outer wall is excluded and the maximum amount of emitters that can be filled is of a similar order compared to a conventional pasting.
  • a corresponding solid head of the electrode can be selected, which is solid or designed as a sintered body.
  • FIG. 1 is a high-pressure sodium lamp 1 with a power of 70 W shown with a two-sided sealed discharge vessel 2 made of ceramic.
  • a two-sided sealed discharge vessel 2 made of ceramic.
  • two external power supply lines 5 are sealed by means of glass solder 4, which are connected to electrodes 6 in the interior of the discharge vessel.
  • FIG. 2 shows an enlarged view of the electrodes 6.
  • the electrodes 6 consist of core pins 7, on which a coil body 8 is pushed. This forms almost the headboard. Both components are made of tungsten.
  • the diameter of the core pin is 700 microns, that of the coil body 8 is a maximum of 1700 microns, with a wire diameter of 200 microns.
  • the helical body 8 consists of two layers 8a and 8b of windings.
  • the end of the core pin 7 is the discharge side against the coil body 8 via. It forms here the emitter vessel 9 with a central bore 16 which is almost completely filled with emitter material 10. This has a concave discharge-side surface 11 near the end of the bore 16th
  • Fig. 3 Fig. 2 shows in an enlarged scale that the vessel wall 12 forms a collar which can be divided into an inner collar part 13 which is convexly curved towards the bore and has the radius of curvature Ri, and an outer collar part 14 which convexly curves towards the outer side wall 15 of the vessel is with an equal radius of curvature Ra as Ri.
  • a concrete emitter material besides the tungstates is thorium oxide.
  • the concrete dimensions of the emitter vessel are as follows: outer diameter 700 ⁇ m Inner diameter 300 ⁇ m Depth of the borehole 4.5 mm Inner radius of curvature Ri 140 ⁇ m Outer radius of curvature Ra 140 ⁇ m
  • the difference in the light output compared to a conventional electrode is already 2.2% after 100 hours and increases monotonically with increasing burning time. Also, the formation of deposits on the insides of the ends of the discharge vessel is already significantly lower in visual comparison than in the conventional design.
  • FIG. 4 shows an embodiment of an electrode 19 according to the invention, in which the emitter vessel is formed by the head 20 of the electrode, which is formed as a sintered body of tungsten. He sits on a separate shaft 21 made of solid tungsten.
  • the emitter material is a pellet 22 in the central borehole 23.
  • the radii of curvature of the inner and outer collar portions 24 and 25 are of different sizes. For example, the inner radius of curvature 140 microns and the outer radius of curvature 60 microns.
  • the overall dimensions of such solid electrodes are on the order of similar electrodes based on a core pin with outer winding.
  • FIG. 5 shows an embodiment in which the emitter vessel 25 is formed as a head. It can also be formed by a core pin.
  • FIG. 5a shows an embodiment in which the inner collar portion 26 has a defined radius of curvature, and this with the outer collar portion 27 via a straight piece, as a tangent to it (radius of curvature infinity) is connected. The outer collar part is an edge with radius of curvature zero.
  • FIG. 5b shows an embodiment in which the inner and outer collar portion 26 and 27 has a defined radius of curvature, and between the inner and outer collar portion, a connecting tangent 28 is present.
  • FIG. 5c shows an embodiment similar FIG.
  • FIG. 5a shows an embodiment with peg-like collar, wherein inner and outer radius of curvature of the inner and outer collar portion 30 and 31 are different, and the collar parts not smooth, but with tip 32 abut each other.
  • the outer collar part that it is designed so that the bow as possible to him higher electric field strength finds than in the inner collar part.
  • This can also be realized by a suitable tip in the region of the outer collar.
  • the curvature in the region of the inner collar part should generate the lowest possible electric field strengths. Its surface must therefore be as smooth as possible and must have no burrs or peaks.
  • a suitable manufacturing method is spark or electrode erosion.
  • Another technique is laser ablation.
  • the electric field strength generated by the surface of the outer collar part should be greater than the electric field strength generated by the surface of the inner collar part. Decisive is therefore not the absolute value of the radii of curvature, but their relation to each other.
  • the width of the inner collar part amount to at least 20% and typically 40 to 60% of the wall thickness of the emitter vessel.

Landscapes

  • Discharge Lamp (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)
EP03029105A 2003-01-16 2003-12-17 Elektrode für eine Hochdruckentladungslampe Expired - Lifetime EP1439567B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10301478 2003-01-16
DE10301478A DE10301478A1 (de) 2003-01-16 2003-01-16 Elektrode für eine Hochdruckentladungslampe

Publications (3)

Publication Number Publication Date
EP1439567A2 EP1439567A2 (de) 2004-07-21
EP1439567A3 EP1439567A3 (de) 2006-07-05
EP1439567B1 true EP1439567B1 (de) 2009-02-11

Family

ID=32520003

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03029105A Expired - Lifetime EP1439567B1 (de) 2003-01-16 2003-12-17 Elektrode für eine Hochdruckentladungslampe

Country Status (7)

Country Link
US (1) US6984939B2 (ja)
EP (1) EP1439567B1 (ja)
JP (2) JP4723190B2 (ja)
KR (1) KR101036689B1 (ja)
AT (1) ATE422708T1 (ja)
CA (1) CA2455087A1 (ja)
DE (2) DE10301478A1 (ja)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10301478A1 (de) * 2003-01-16 2004-07-29 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Elektrode für eine Hochdruckentladungslampe
CN101536141B (zh) * 2006-12-18 2011-07-27 奥斯兰姆有限公司 用于放电灯的电极
DE102009055123A1 (de) * 2009-12-22 2011-06-30 Osram Gesellschaft mit beschränkter Haftung, 81543 Keramische Elektrode für eine Hochdruckentladungslampe

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL95307C (ja) * 1956-02-24
NL99793C (ja) * 1957-08-10 1961-11-15
US3114855A (en) * 1961-06-27 1963-12-17 Bausch & Lomb Gas discharge lamp with a collimating reflector electrode
US3560790A (en) * 1967-07-27 1971-02-02 Perkin Elmer Corp Alkali metal cathode lamps
US3619699A (en) * 1970-05-25 1971-11-09 Gen Electric Discharge lamp having cavity electrodes
US3777200A (en) * 1971-05-14 1973-12-04 Nasa High powered arc electrodes
US3798492A (en) * 1971-05-17 1974-03-19 Itt Emissive electrode
JPS4950776A (ja) * 1972-06-14 1974-05-17
US3916241A (en) 1972-06-14 1975-10-28 Gte Sylvania Inc High pressure electric discharge lamp and electrode therefor
US3983440A (en) * 1973-01-08 1976-09-28 Thorn Electrical Industries Limited Discharge lamp component
DE2424549A1 (de) * 1973-05-23 1974-12-12 John Michael Prof Thompson Stroemungsmittelanalysiergeraet
JPS5133356A (ja) 1974-09-14 1976-03-22 Shinko Burain Kk Hakeikeishabannyoruchinkobunrisochi
JPH0276463U (ja) * 1988-11-30 1990-06-12
JPH05325892A (ja) * 1992-05-15 1993-12-10 Hitachi Ltd 高圧ナトリウムランプ
US5686789A (en) * 1995-03-14 1997-11-11 Osram Sylvania Inc. Discharge device having cathode with micro hollow array
JP2938838B2 (ja) 1998-01-26 1999-08-25 ティーディーケイ株式会社 放電灯用電極とその製造方法
JP2002141018A (ja) * 2000-11-06 2002-05-17 Ushio Inc 放電ランプ
JP2002289134A (ja) 2001-03-27 2002-10-04 West Electric Co Ltd 冷陰極放電管及び照明装置
DE10301478A1 (de) * 2003-01-16 2004-07-29 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Elektrode für eine Hochdruckentladungslampe

Also Published As

Publication number Publication date
US20040140767A1 (en) 2004-07-22
ATE422708T1 (de) 2009-02-15
EP1439567A3 (de) 2006-07-05
JP2004221090A (ja) 2004-08-05
KR101036689B1 (ko) 2011-05-24
KR20040066019A (ko) 2004-07-23
JP5150716B2 (ja) 2013-02-27
US6984939B2 (en) 2006-01-10
JP4723190B2 (ja) 2011-07-13
DE10301478A1 (de) 2004-07-29
EP1439567A2 (de) 2004-07-21
DE50311168D1 (de) 2009-03-26
JP2011077057A (ja) 2011-04-14
CA2455087A1 (en) 2004-07-16

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