EP0555755B1 - Lampe à décharge haute pression - Google Patents

Lampe à décharge haute pression Download PDF

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Publication number
EP0555755B1
EP0555755B1 EP93101665A EP93101665A EP0555755B1 EP 0555755 B1 EP0555755 B1 EP 0555755B1 EP 93101665 A EP93101665 A EP 93101665A EP 93101665 A EP93101665 A EP 93101665A EP 0555755 B1 EP0555755 B1 EP 0555755B1
Authority
EP
European Patent Office
Prior art keywords
discharge lamp
high pressure
pressure discharge
shaft
diameter
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
EP93101665A
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German (de)
English (en)
Other versions
EP0555755A1 (fr
Inventor
Jürgen Dr. Scheidt v.
Axel Bunk
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 EP0555755A1 publication Critical patent/EP0555755A1/fr
Application granted granted Critical
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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
    • H01J61/04—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 invention relates to a high-pressure discharge lamp with a metal halide fill according to the preamble of claim 1.
  • Such a metal halide high-pressure discharge lamp for general lighting is known from DE-PS 27 18 527. Lamps of this type usually only have sufficient burning and ignition properties; in addition, a flicker of different intensity can occur after different burning times, which fluctuates greatly over time.
  • Flicker is to be understood here to mean all fluctuations in luminance, which range from periodic flickering to aperiodic flickering. These fluctuations in luminance are summarized in one value, the flicker factor. Previous investigations have shown that there is a direct proportionality between the flicker factor and the direct voltage component of the lamp current. Technically, the flickering can be traced back to an insufficient electrode temperature, which manifests itself in the sheet jumping at different attachment points.
  • the object of the invention is to provide a high-pressure discharge lamp with a metal halide filling, which shows a flicker that is reduced compared to the prior art, so that the lamp has good ignition and burning properties with stable lighting and electrical data over the life of the lamp .
  • the tip of the electrode head is essentially spherical in the direction of the discharge arc, the jumping of the discharge arc from one to another starting point on the head part is greatly reduced.
  • Essentially spherical here means that the tip of the electrode head can also have a shape slightly different from a sphere in the direction of an ellipsoidal or oval shape.
  • the head part has good thermal contact with the spiral part, provided it is not fused with the last turn of the spiral part. The surface of the head part facing the discharge then does not experience any significant cooling during the power pauses and thus has a uniform temperature during operation.
  • the surface of the substantially spherical The tip of the head part must not be too large, because otherwise - even though there is sufficient heat capacity - too much energy is emitted by radiation and the ignition and arc transfer are hindered by the strong cooling.
  • the head part therefore advantageously consists of a ball which has a diameter between 1.5 and 2.5 times the shaft diameter or of a ball segment, the ball diameter of the ball segment corresponding to at least 3 times the diameter of the shaft.
  • the helical part has 2 to 4 turns, the helical wire having a diameter that is between half and two thirds of the shaft diameter. If these characteristics are adhered to, there is an optimal sheet transfer with a flicker factor of less than 1%.
  • FIG. 1 shows the structure of a 70 W high-pressure discharge lamp 1 according to the invention with a discharge vessel 2 made of quartz glass that is squeezed on one side, the latter being gas-tightly surrounded by an outer bulb 3 likewise squeezed on one side.
  • the schematically illustrated electrodes 4, 4 '; 5 are squeezed into the discharge vessel 2 in a gas-tight manner via sealing foils 6, 7 made of molybdenum, and via current leads 8, 9, sealing foils 10, 11 of the outer bulb 3 and further — not visible here — short current leads with the electrical connection pins 12, 13 of the ceramic base 14 of the type G 12 connected.
  • a getter material 16 is also attached to the pinch 15 of the discharge vessel 2 in a potential-free manner via a piece of wire on a metal plate.
  • the discharge vessel contains metal iodides and bromides of the elements sodium, tin, thallium, indium and lithium.
  • FIG. 2 shows the exact structure of an electrode 4 of the high-pressure discharge lamp according to FIG. 1.
  • the electrode 4 (the structure of the second electrode is analog) has a shaft 17, one end of which is melted into the pinch 15 in a gas-tight manner via a molybdenum sealing film 6.
  • the other end of the shaft 17 with a diameter of 0.4 mm is angled by 90 ° in the direction of the discharge arc.
  • This end carries a spiral part 18 of 2.5 turns, which are wound tightly on the shaft end and consist of a wire of 0.2 mm in diameter.
  • On the free tip of the Shaft 17 is melted a ball 19 with a 0.7 mm diameter, which bears firmly against the last turn of the helical part 18. All parts of the electrode 4 consist of undoped tungsten.
  • FIG 3 shows, partially in section, the exact structure of another electrode design 4 'of the high-pressure discharge lamp according to Figure 1.
  • the electrode 4' (the structure of the second electrode is analog) has a shaft 17 ', one end of which over the molybdenum sealing film 6 in the pinch 15 is melted gas-tight.
  • the other end of the shaft 17 'with a diameter of 0.4 mm is angled by 90 ° in the direction of the discharge arc.
  • This end carries a helical part 18 'of about 2.5 turns, which are wound tightly on the shaft end and consist of a wire of 0.4 mm in diameter.
  • a head part in the form of a coupling 19 ' is melted, which has the shape of a spherical segment with a radius of 1.4 mm in the direction of the discharge arc.
  • All electrode parts can consist of pure tungsten.
  • the electrode shaft 17 'can also consist of a metal that melts at a lower temperature such as tungsten, e.g. Rhenium. In this case, it is necessary that both the helical part 18 'and the coupling 19' consist of pure or doped tungsten.
  • the 150 W high-pressure discharge lamp 20 shown in FIG. 4 consists of a two-sided squeezed discharge vessel 21 made of quartz glass is enclosed by an outer bulb 22.
  • the electrodes 23, 24 - shown schematically - are melted gas-tight into the discharge vessel 21 by means of foils 25, 26 and via current leads 27, 28, sealing foils 29, 30 of the outer bulb 22 and via further short current leads with the electrical connections of the ceramic base (R7s) 31 , 32 connected.
  • a getter material 33 applied to a metal plate is additionally melted potential-free - via a piece of wire.
  • the ends 34, 35 of the discharge vessel 21 are provided with a heat-reflecting coating.
  • the discharge vessel 21 contains metal iodides and bromides of sodium, tin, thallium, indium and lithium as the filling.
  • FIG. 5 shows an electrode 23, 24 as it is melted into the bruises 36 of the discharge vessel.
  • the electrode 23, 24 has a straight shaft 37, one end of which is welded to the molybdenum sealing film 25, 26.
  • the other end of the shaft 37 with a diameter of 0.5 mm carries a helical part 38, which consists of 2.5 turns of a wire of 0.3 mm diameter, which are wound tightly on the shaft 37.
  • a ball 39 with a diameter of 1.0 mm is melted onto the tip of the shaft 37 facing the discharge, the helical part 38 abutting the ball 39 and thus having thermal contact with the ball 39.
  • All parts of the electrode 23, 24 are made of undoped tungsten.

Landscapes

  • Discharge Lamp (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)

Claims (8)

  1. Lampe à décharge haute pression (1;20) d'une puissance inférieure ou égale à 400 W, dont l'enceinte de décharge (2;21) contient un remplissage formé de mercure, d'halogénures métalliques ainsi que d'au moins un gaz rare, enceinte dans laquelle deux électrodes (4,4′,5;23,24) sont fixées par pincement d'une manière étanche aux gaz par l'intermédiaire de feuilles d'étanchéité (6,7;25,26), chaque électrode (4,4′,5;23,24) possédant les caractéristiques suivantes :
    - l'électrode (4,4′,5;23,24) possède une tige (17,17′;37) dont l'extrémité libre est tournée vers l'arc de décharge,
    - une partie de filament (18,18′;38) comportant des spires étroitement jointives est enfichée sur l'extrémité, tournée vers l'arc de décharge, de la tige (17,17′;37) de l'électrode,
    caractérisée par le fait que sur l'extrémité, tournée vers l'arc de décharge, de la tige (17,17′;37) de l'électrode et/ou sur la dernière spire, tournée vers l'arc de décharge, de la partie de filament (18′) est fixée par fusion une partie de tête massive, qui possède, au moins dans la direction de l'arc de décharge, une configuration de forme essentiellement sphérique.
  2. Lampe à décharge haute pression suivant la revendication 1, caractérisée par le fait que la partie de tête est en contact thermique étroit avec la partie de filament (18,18′,38).
  3. Lampe à décharge haute pression suivant la revendication 1, caractérisée par le fait que la partie de tête est constituée par une sphère (19;39), dont le diamètre est compris entre 1,5 et 2,5 fois le diamètre de la tige (17; 37).
  4. Lampe à décharge haute pression suivant la revendication 1, caractérisée par le fait que la partie de tête est constituée essentiellement par un segment de sphère (19′), le diamètre du segment de sphère (19′) correspondant au moins au triple du diamètre de la tige (17).
  5. Lampe à décharge haute pression suivant la revendication 1, caractérisée par le fait que le fil de la partie de filament (18,18′;38) possède un diamètre, qui est compris entre la moitié et la totalité du diamètre de la tige.
  6. Lampe à décharge haute pression suivant la revendication 1, caractérisée par le fait que la partie de filament (18,18′;38) possède deux à quatre spires.
  7. Lampe à décharge haute pression suivant la revendication 1, caractérisée par le fait que toutes les parties d'électrodes sont réalisées en tungstène pur.
  8. Lampe à décharge haute pression suivant la revendication 1, caractérisée par le fait que la tige d'électrode est réalisée en un métal qui fond à des températures plus faibles que le tungstène et que la partie de filament ainsi que la partie de tête sont réalisées en tungstène pur ou dopé.
EP93101665A 1992-02-11 1993-02-03 Lampe à décharge haute pression Expired - Lifetime EP0555755B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4203976 1992-02-11
DE4203976A DE4203976A1 (de) 1992-02-11 1992-02-11 Hochdruckentladungslampe

Publications (2)

Publication Number Publication Date
EP0555755A1 EP0555755A1 (fr) 1993-08-18
EP0555755B1 true EP0555755B1 (fr) 1995-10-11

Family

ID=6451416

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93101665A Expired - Lifetime EP0555755B1 (fr) 1992-02-11 1993-02-03 Lampe à décharge haute pression

Country Status (5)

Country Link
US (1) US5510675A (fr)
EP (1) EP0555755B1 (fr)
JP (1) JPH0613027A (fr)
CA (1) CA2089251C (fr)
DE (2) DE4203976A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998037571A1 (fr) * 1997-02-24 1998-08-27 Koninklijke Philips Electronics N.V. Lampe aux halogenures haute pression
JP2002519833A (ja) * 1998-06-30 2002-07-02 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ 高圧ガス放電ランプ
JP2002352772A (ja) * 2001-05-24 2002-12-06 Phoenix Denki Kk 超高圧放電灯
JP3926211B2 (ja) * 2002-05-29 2007-06-06 日本碍子株式会社 高圧水銀灯および高圧水銀灯用封止材

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2687489A (en) * 1952-06-26 1954-08-24 Hanovia Chemical & Mfg Co Electrode
NL269416A (fr) * 1960-09-21
US3170081A (en) * 1962-06-05 1965-02-16 Westinghouse Electric Corp Discharge lamp electrode
US3778664A (en) * 1972-12-22 1973-12-11 Westinghouse Electric Corp Beaded coils for electric lamps and similar devices
DE2718527A1 (de) * 1977-04-26 1978-11-09 Patra Patent Treuhand Spektrallampe zur erzeugung des eisenlinienspektrums
US4340836A (en) * 1978-09-11 1982-07-20 General Electric Company Electrode for miniature high pressure metal halide lamp
US4275329A (en) * 1978-12-29 1981-06-23 General Electric Company Electrode with overwind for miniature metal vapor lamp
US4528478A (en) * 1983-06-09 1985-07-09 Gte Products Corporation Single-ended metal halide discharge lamp with minimal color separation
US4766348A (en) * 1983-06-09 1988-08-23 Gte Products Corporation Single-ended metal halogen lamp and fabrication process employing ionization potential selection of additive gases
DE3641045A1 (de) * 1986-12-01 1988-06-09 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Einseitig gequetschte hochdruckentladungslampe
DE69011145T2 (de) * 1989-01-31 1995-01-19 Toshiba Lighting & Technology Einseitig gequetschte Metalldampfentladungslampe.

Also Published As

Publication number Publication date
DE4203976A1 (de) 1993-08-12
JPH0613027A (ja) 1994-01-21
CA2089251A1 (fr) 1993-08-12
EP0555755A1 (fr) 1993-08-18
DE59300723D1 (de) 1995-11-16
US5510675A (en) 1996-04-23
CA2089251C (fr) 2002-08-20

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