EP0220673B1 - Lampe à décharge à haute pression - Google Patents

Lampe à décharge à haute pression Download PDF

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Publication number
EP0220673B1
EP0220673B1 EP86114648A EP86114648A EP0220673B1 EP 0220673 B1 EP0220673 B1 EP 0220673B1 EP 86114648 A EP86114648 A EP 86114648A EP 86114648 A EP86114648 A EP 86114648A EP 0220673 B1 EP0220673 B1 EP 0220673B1
Authority
EP
European Patent Office
Prior art keywords
electrode
discharge
arc
discharge lamp
pressure 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
EP86114648A
Other languages
German (de)
English (en)
Other versions
EP0220673A3 (en
EP0220673A2 (fr
Inventor
Jürgen Dr. Heider
Richard Kotschenreuther
Wolfgang Schade
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 EP0220673A2 publication Critical patent/EP0220673A2/fr
Publication of EP0220673A3 publication Critical patent/EP0220673A3/de
Application granted granted Critical
Publication of EP0220673B1 publication Critical patent/EP0220673B1/fr
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
    • H01J61/04—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 discharge vessel made of quartz glass, which is squeezed on one side and which, in addition to a filling of mercury and additions of metal halides and noble gas, has two electrodes which consist of high-melting metal wire, the shafts of which are melted into the pinch in a vacuum-tight manner via molybdenum foils and the tips of which , at which the discharge begins, point in the direction of the discharge running transversely to the shafts.
  • Such a high-pressure discharge lamp for direct current operation with a power consumption of less than 100 W is known from US Pat. No. 4,415,829.
  • a helix is attached to the cathode near the tip.
  • the poor sheet acceptance is due in particular to the slow heating of the electrode to operating temperature, such an electrode usually also has a large heat loss.
  • the heating time is proportional to the square of the radius of the electrode wire and indirectly proportional to the length of the electrode and the current of the lamp. If one assumes a fixed radius of the electrode wire and a certain fixed operating current of the lamp, the heating-up time can be shortened by increasing the electrode length.
  • the aim of the invention is to create a high-pressure discharge lamp that is squeezed on one side, which ensures quick and safe ignition and at the same time has a precisely defined arch attachment for installation in optical systems, such as Headlight is suitable.
  • the high-pressure discharge lamp with the features mentioned in the preamble of the main claim is according to the invention characterized in that the metal wire of each electrode near the tip facing the discharge describes an arc which lies essentially in the plane formed by the discharge and the electrode shaft and appears closed in plan view, the arc on the side of the electrode shaft facing away from the discharge lies and the crossing wire parts do not touch each other.
  • the increase in the electrode length required for a quick and flawless ignition is achieved without the electrode spacing and thus the arc length changing and at the same time forming a tip for the start of the discharge, which defines the arc position over the entire life of the lamp .
  • the tips of the electrodes are essentially aligned such that the discharge intersects the axis of symmetry of the discharge vessel.
  • each point of the arc forms an angle of at most ⁇ 30 ° with the plane formed by the discharge and the electrode shafts. If the entire arch were in this plane, the crossing wire parts would have to be connected to one another. This would, however, cancel the desired increase in the electrode length.
  • the arc should be shaped so that it has a sector of a circle with a central angle of at least 180 o can be inscribed and the tip of the electrodes forms a 90 o angle with the electrode shaft.
  • the radius of the sector of the circle that can be inscribed in the arc must at least correspond to the radius of the electrode wire. In addition to the simple and inexpensive manufacture of the electrode, this prevents a thermal short-circuit from occurring and the electrode wire in the arc being cracked due to its brittleness due to excessive kinks, which are the starting points for corrosion (especially in the case of tin-sodium halides in the filling) ) form.
  • the difference between the distance between the two electrode shafts and the distance between the two protruding electrode tips must be at least twice the diameter of the electrode wire. This ensures the defined arc attachment at the tip of the electrode and thus the defined arc position over the entire life of the lamp - despite the erosion of the electrode tip.
  • FIG. 1 shows the structure of a high-pressure discharge lamp 1 with a discharge vessel 2 made of quartz glass, which is squeezed on one side, the discharge vessel 2 being surrounded by an outer bulb 3, which is also squeezed on one side.
  • the schematically illustrated electrodes 4, 5 are melted in a gas-tight manner into the pinch 8 of the discharge vessel 2 by means of molybdenum foils 6, 7 and are connected to the molybdenum sealing foils 11, 12 in the pinch 13 of the outer bulb 3 via current leads 9, 10.
  • Electrical sealing pins 14, 15 are also attached to the sealing foils 11, 12 and establish the connection with the connections of the standardized base, which is not shown here for reasons of clarity.
  • a zirconium getter 17, which is attached to a metal plate 16, is also attached to the pinch 8 of the discharge vessel 2.
  • the lamp As a filling in the discharge vessel 2, the lamp has metal iodides and bromides of sodium, tin, thallium, indium and lithium in addition to mercury and a noble gas. With a power consumption of 40 W, the lamp achieves a luminous efficacy of approx. 75 lm / W.
  • FIGS. 2 and 3 show an enlarged view of the discharge vessel 2 with the two electrodes 4 and 5.
  • the electrodes 4, 5 consist of a 0.2 mm thick tungsten wire with a round cross-section and each have a circular 270 ° near the electrode tips 18, 19 Arch 20, 21 in the form of an eyelet.
  • the arcs 20, 21 lie on the sides of the electrode shafts 22, 23 facing away from the discharge and have an inner diameter of 0.3 mm.
  • the electrode tips 18, 19 each form one with the shafts 22, 23 90 ° angle and protrude 0.3 mm beyond the crossing points 24, 25.
  • the wire parts of the electrodes 4, 5 are each at a distance of approximately 0.05 mm from one another.
  • the shafts 22, 23 have a length of approximately 7 mm from the point of intersection 24, 25 to the attachment point 26, 27 on the respective molybdenum sealing foils 6, 7 in the pinch 8.
  • the electrode wire for both electrodes 4, 5 is pulled past the same side of the electrode shaft 22, 23. This simplifies the manufacture of the electrodes 4, 5, since only one version of the electrodes has to be manufactured with them.
  • the electrode shafts 22, 23 are each rotated approximately 27 ° to one another, so that the tips 18, 19 of the electrodes 4, 5 point in the direction of the discharge arc.

Landscapes

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

Claims (4)

  1. Lampe à décharge haute pression (1) comportant une enceinte de décharge (2) pincée unilatéralement, en verre quartzeux, qui possède, en dehors d'une charge de mercure ainsi que d'additifs formés d'halogénures métalliques et d'un gaz rare, deux électrodes (4,5) qui sont réalisées en un fil métallique à point de fusion élevé et dont les tiges (22,23) sont scellées par fusion, d'une manière étanche au vide, dans la partie pincée (8), par l'intermédiaire de feuilles de molybdène (6,7) et dont les pointes (18,19), au niveau desquelles s'effectue la décharge, sont dirigées vers la décharge qui se produit transversalement par rapport aux tiges (22,23), caractérisée par le fait que le fil métallique de chaque électrode (4,5) s'étend, à proximité des pointes (18,19) tournées vers la décharge, selon un arc (20,21), qui est situé sensiblement dans le plan formé par la décharge et les tiges (22,23) des électrodes et apparaît avec une forme fermée selon une vue en plan, l'arc (20,21) étant situé sur le côté de la tige d'électrode (22,23), tourné à l'opposé de la décharge, tandis que les éléments de fil, qui se croisent, ne se touchent pas.
  2. Lampe à décharge haute pression selon la revendication 1, caractérisée en ce qu'un secteur circulaire possédant un angle au centre égal au moins à 180° peut être inscrit dans l'arc (20,21) et que la pointe (18,19) de l'électrode (4,5) fait un angle de 90° avec la tige d'électrode (22,23).
  3. Lampe à décharge haute pression selon la revendication 2, caractérisée en ce que le rayon du secteur circulaire, qui peut être inscrit dans l'arc (20,21), correspond au moins au rayon du fil d'électrode.
  4. Lampe à décharge haute pression selon une ou plusieurs des revendications 1 à 3, caractérisée en ce que la différence entre la distance entre les deux tiges (22,23) des électrodes et la distance entre les deux pointes saillantes (18,19) des électrodes correspond au moins au double du diamètre du fil des électrodes.
EP86114648A 1985-10-24 1986-10-22 Lampe à décharge à haute pression Expired - Lifetime EP0220673B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853537872 DE3537872A1 (de) 1985-10-24 1985-10-24 Hochdruckentladungslampe
DE3537872 1985-10-24

Publications (3)

Publication Number Publication Date
EP0220673A2 EP0220673A2 (fr) 1987-05-06
EP0220673A3 EP0220673A3 (en) 1989-05-10
EP0220673B1 true EP0220673B1 (fr) 1992-03-04

Family

ID=6284378

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86114648A Expired - Lifetime EP0220673B1 (fr) 1985-10-24 1986-10-22 Lampe à décharge à haute pression

Country Status (4)

Country Link
US (1) US4782266A (fr)
EP (1) EP0220673B1 (fr)
JP (1) JPS62100937A (fr)
DE (2) DE3537872A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU604126B2 (en) * 1987-06-11 1990-12-06 Kabushiki Kaisha Toshiba High intensity discharge lamp of the one side sealed type capable of compensating for the change of luminous efficiency caused by its different lighting angles and manufacturing method of the same
US4998036A (en) * 1987-12-17 1991-03-05 Kabushiki Kaisha Toshiba Metal vapor discharge lamp containing an arc tube with particular bulb structure
KR910010108B1 (ko) * 1988-05-27 1991-12-16 도오시바 라이텍크 가부시기가이샤 편봉지형 메탈해라이드 램프
US4988917A (en) * 1988-12-16 1991-01-29 Gte Products Corporation Hooked electrode for arc lamp
DE69011145T2 (de) * 1989-01-31 1995-01-19 Toshiba Lighting & Technology Einseitig gequetschte Metalldampfentladungslampe.
US5138229A (en) * 1989-09-20 1992-08-11 Toshiba Lighting & Technology Corporation Single-sealed metal vapor electric discharge lamp
US5144201A (en) * 1990-02-23 1992-09-01 Welch Allyn, Inc. Low watt metal halide lamp
DE102005016048B4 (de) * 2005-04-07 2018-11-29 Ledvance Gmbh Metallhalogenidlampe mit einer ionisierbaren Füllung enthaltend mindestens ein Inertgas, Quecksilber und Metallhalogenide von Tl, Na, Li, Dy, Ho und Tm

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1242173A (en) * 1969-02-17 1971-08-11 Gen Electric Co Ltd Improvements in or relating to electric discharge lamps
GB1522035A (en) * 1976-11-11 1978-08-23 Gen Electric Co Ltd High pressure electric discharge lamps
US4320322A (en) * 1980-03-24 1982-03-16 Gte Products Corporation Electrode geometry to improve arc stability
US4321504A (en) * 1980-03-24 1982-03-23 Gte Products Corporation Low wattage metal halide arc discharge lamp
US4386292A (en) * 1980-07-02 1983-05-31 Gte Products Corporation Projection lamp comprising single ended arc discharge lamp and an interference filter
US4454450A (en) * 1981-06-29 1984-06-12 Gte Products Corporation Vertical running, high brightness, low wattage metal halide lamp
US4415829A (en) * 1981-08-13 1983-11-15 Gte Products Corporation Direct current operable arc lamp
US4633136A (en) * 1982-04-20 1986-12-30 Patent-Treuhand-Gesellschaft Fur Elektrische Gluhlampen Mbh High-pressure discharge lamp with low power input
US4631446A (en) * 1984-05-04 1986-12-23 Gte Products Corporation Single-ended high intensity discharge lamp

Also Published As

Publication number Publication date
EP0220673A3 (en) 1989-05-10
JPH0522332B2 (fr) 1993-03-29
US4782266A (en) 1988-11-01
DE3684091D1 (de) 1992-04-09
EP0220673A2 (fr) 1987-05-06
DE3537872A1 (de) 1987-04-30
JPS62100937A (ja) 1987-05-11

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