EP0184876A2 - Lampe à décharge à gaz à haute pression à électrode en fer blanc de tungstène - Google Patents

Lampe à décharge à gaz à haute pression à électrode en fer blanc de tungstène Download PDF

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Publication number
EP0184876A2
EP0184876A2 EP85201901A EP85201901A EP0184876A2 EP 0184876 A2 EP0184876 A2 EP 0184876A2 EP 85201901 A EP85201901 A EP 85201901A EP 85201901 A EP85201901 A EP 85201901A EP 0184876 A2 EP0184876 A2 EP 0184876A2
Authority
EP
European Patent Office
Prior art keywords
electrode
lamp
electrode head
pressure gas
tungsten sheet
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.)
Withdrawn
Application number
EP85201901A
Other languages
German (de)
English (en)
Other versions
EP0184876A3 (fr
Inventor
Ernst Dr. Fischer
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.)
Philips Intellectual Property and Standards GmbH
Koninklijke Philips NV
Original Assignee
Philips Corporate Intellectual Property GmbH
Philips Patentverwaltung GmbH
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics NV
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 Philips Corporate Intellectual Property GmbH, Philips Patentverwaltung GmbH, Philips Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Philips Corporate Intellectual Property GmbH
Publication of EP0184876A2 publication Critical patent/EP0184876A2/fr
Publication of EP0184876A3 publication Critical patent/EP0184876A3/fr
Withdrawn legal-status Critical Current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 gas discharge lamp with electrodes, at least one of which has an electrode head made of tungsten sheet metal, to which the discharge arc acts when the lamp is in operation.
  • sheet metal is understood to mean a plate-shaped material whose thickness is less than a third of its largest transverse dimension, preferably less than a fifth.
  • Electrodes for high-pressure gas discharge lamps are often designed as filaments made of tungsten wire, which are wound on a tungsten pin, depending on the application the center pin protruding from the filament or extending only into the lower part of the filament.
  • filaments made of tungsten wire are generally preferred over solid bodies, since the discharge arc only attaches to a small piece of the wire. The length of this piece corresponds approximately to the wire diameter.
  • the thermal load on the electrode remains lower than with solid bodies, but on the other hand there is a large area available for the radiation of the supplied heat. With such electrodes, therefore, the tungsten removal and thus the blackening of the lamp bulb can be kept low, which considerably increases the life of the lamp.
  • the overall dimensions of an electrode for a lamp power of 30 W are only about 0.8 mm in total. Even minor errors, for example gaps between two turns of only a few pm, can change the heat balance of the electrode considerably, which leads to deviations in the electrical and color properties of the lamp.
  • electrodes for 100 to 300 W high pressure gas discharge lamps are known, the electrode head of which is made of tungsten sheet.
  • the electrode tungsten sheet is either bent in a U-shape or is designed as a cylinder which is closed at the front or as a spherical shell (FIGS. 2 to 4), with the discharge starting on a relatively large end face of the electrodes in order to achieve the largest possible emitting zone.
  • the thermal load on the electrodes is very large, which leads to a short service life of the corresponding lamps.
  • Another electrode known from GB-PS 530 405 (FIG. 15) consists of a straight piece of wire extending in the axial direction of the lamp, to which a spirally bent metal foil is attached, set back somewhat from the free end of the wire. Only at the moment of ignition does a glow discharge attack the foil, but the actual discharge arc always starts at the end of the wire. There is a risk that the electrode head, which is designed as a thin wire tip, will melt away. In addition, the thin piece of wire is practically unable to dissipate the heat generated by the discharge in the wire tip or the metal foil. Such electrodes therefore only have a short lifespan.
  • the invention is therefore based on the object of providing a high-pressure gas discharge lamp with electrodes which can be produced easily and reproducibly, but on the other hand have the good properties of filament electrodes, that is to say low thermal stress and good radiation properties.
  • the electrode head is designed as a flat or curved plate, the elongate front end face of which serves as the sole area of attack for the discharge arc.
  • the electrode head of such an electrode has a cross section on its end face, one side of which is considerably smaller than the other. Since the discharge arc acts practically point-wise on this electrode end face, the electrode only heats up relatively little. On the other hand, the electrode has a large surface for heat radiation. In this way, overheating of the electrode is avoided and a correspondingly long service life is achieved.
  • a power supply strip can be welded to the electrode head, which is designed as a flat or curved plate.
  • the electrode head and the power supply strip connected to it consist of a piece of tungsten sheet.
  • the electrode head and the power supply strip can be punched as a whole from tungsten sheet.
  • the flat power supply strips produced in this way can be better inserted into the Melt the quartz glass of the lamp bulb and distribute the heat to be transported over a larger area. In this way, a higher heat load at the point of entry into the quartz bulb is possible, which in turn has a favorable influence on the temperature profile of the bulb wall.
  • the power supply strips are welded to a lenticular etched molybdenum foil, which is then melted pressure-tight into the quartz glass bulb.
  • the sealing part embedded in the lamp bulb is also formed in one piece with the electrode.
  • the entire electrode including the sealing part as a whole is expediently stamped out of tungsten sheet, the sealing part subsequently, e.g. by etching, can obtain a lenticular cross section.
  • the electrode shown in FIG. 1 for a high-pressure gas discharge lamp consists of a piece of tungsten sheet 1.
  • the actual electrode head 2, on which the discharge arc engages during operation of the lamp, is designed as a flat plate with an approximately square surface.
  • the rectangular front end face 3 of the electrode head 2 faces the discharge and serves as the sole contact surface for the discharge arc.
  • a power supply strip 4 connects to the electrode head 2 and is formed in one piece with the electrode head 2.
  • the electrode head 2 can be punched out of tungsten sheet together with the power supply strip 4.
  • the upper section of the electrode arrangement shown in FIG. 2 corresponds to the electrode according to FIG. 1. Corresponding parts are therefore provided with the same reference symbols.
  • the current supply strip 4 is followed by a sealing part 5, which is also made of tungsten sheet metal and is formed in one piece with the current supply strip 4 and the electrode head 2.
  • the entire electrode arrangement consisting of electrode head 2, current supply strip 4 and sealing part 5 can be punched out as a whole from thin tungsten sheet.
  • FIG. 3 and 4 each show an electrode-side end of a high-pressure gas discharge lamp with one out Quartz glass existing lamp bulb 7, in the pinch 8, a lamp electrode with sealing part is melted.
  • an electrode made of tungsten sheet according to FIG. 1 is used with a flat, approximately square plate as the electrode head 2 and an adjoining power supply strip 4.
  • This power supply strip 4 is connected to a molybdenum foil which is etched in cross-section and is lenticular in cross-section 9 welded, at the other end of which is welded an external power lead pin 10.
  • the power supply strip 4, the molybdenum foil 9 and the power supply pin 10 are melted into the pinch 8 of the lamp bulb 7 in a vacuum-tight manner.
  • the high-pressure gas discharge lamp according to FIG. 4 is provided with an electrode arrangement according to FIG. 2, in which the sealing part 5 is formed in one piece with the electrode head 2 and the current supply strip 4. Between points A and B, the tungsten sheet of the sealing part 5 is etched into a lenticular cross section. At the end of the sealing part 5, in turn, an external power supply pin 10 is welded.
  • the electrode head 2 In the case of a 30 W high-pressure mercury halide gas discharge lamp with an outer diameter of the lamp bulb 7 of approximately 8 mm and a filling of mercury, NaJ, T1J and InJ, the electrode head 2 consists of tungsten sheet 0.1 mm thick and approximately 1.1 mm wide.
  • the elongated end face 3 of the electrode head 2 serving as the sole contact surface for the discharge arc thus has a surface area of approximately 0.11 mm 2 .
  • the width of the power supply strip 4 is 0.3 mm. Due to its relatively large surface area, the electrode shown is able to pass through the discharge arc at a point on the front End face 3 heat generated not only by heat conduction, but above all by heat radiation, so that no overheating of the electrode can occur.

Landscapes

  • Discharge Lamp (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Discharge Lamps And Accessories Thereof (AREA)
EP85201901A 1984-12-08 1985-11-19 Lampe à décharge à gaz à haute pression à électrode en fer blanc de tungstène Withdrawn EP0184876A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19843444922 DE3444922A1 (de) 1984-12-08 1984-12-08 Hochdruck-gasentladungslampe mit einer aus wolframblech bestehenden elektrode
DE3444922 1984-12-08

Publications (2)

Publication Number Publication Date
EP0184876A2 true EP0184876A2 (fr) 1986-06-18
EP0184876A3 EP0184876A3 (fr) 1988-10-26

Family

ID=6252324

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85201901A Withdrawn EP0184876A3 (fr) 1984-12-08 1985-11-19 Lampe à décharge à gaz à haute pression à électrode en fer blanc de tungstène

Country Status (5)

Country Link
US (1) US4700107A (fr)
EP (1) EP0184876A3 (fr)
JP (1) JPS61138446A (fr)
CA (1) CA1249014A (fr)
DE (1) DE3444922A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4229317A1 (de) * 1992-09-02 1994-03-03 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Hochdruckentladungslampe
US5420477A (en) * 1993-01-15 1995-05-30 Welch Allyn, Inc. Electrode for metal halide discharge lamp
KR100822490B1 (ko) * 2000-02-11 2008-04-16 코닌클리즈케 필립스 일렉트로닉스 엔.브이. 고압 방전 램프와 점화 안테나를 포함하는 유닛
EP1143485A3 (fr) * 2000-04-03 2001-11-14 Matsushita Electric Industrial Co., Ltd. Lampes à décharge, procédé pour leur fabrication et unité de lampe
DE102004028562A1 (de) * 2004-06-15 2006-01-05 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Elektrode für eine Entladungslampe und Entladungslampe
JP5040577B2 (ja) * 2007-10-16 2012-10-03 ウシオ電機株式会社 超高圧放電ランプ

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1723929A (en) * 1926-03-09 1929-08-06 Francotte Regnier Luminous electric discharge tube
FR835607A (fr) * 1938-03-22 1938-12-27 Tube à décharge
US2342806A (en) * 1938-06-22 1944-02-29 Hofmann Josef High pressure mercury vapor lamp
DE712691C (de) * 1939-06-15 1941-10-23 Electricitaetsgesellschaft San Hochdruckquecksilberdampfbogenlampe mit Gasgrundfuellung und nichtaktivierten, durchdie Entladung aufgeheizten Gluehelektroden
FR903909A (fr) * 1942-08-12 1945-10-22 Licht A G Vereinigte Glu Hlamp Lampe à vapeurs métalliques à haute pression
US2508114A (en) * 1947-12-05 1950-05-16 Gen Electric Tantalum electrode for electric discharge devices
US2876377A (en) * 1955-09-01 1959-03-03 Westinghouse Electric Corp Ribbon seal and method of fabrication
US3080497A (en) * 1959-12-11 1963-03-05 Gen Electric Bent end incandescent lamp
NL174683C (nl) * 1975-09-11 1984-07-16 Philips Nv Hogedrukgasontladingslamp.
GB1594976A (en) * 1978-05-24 1981-08-05 Gen Electric Co Ltd High pressure electric discharge lamps

Also Published As

Publication number Publication date
CA1249014A (fr) 1989-01-17
DE3444922A1 (de) 1986-06-12
EP0184876A3 (fr) 1988-10-26
JPS61138446A (ja) 1986-06-25
US4700107A (en) 1987-10-13

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Inventor name: FISCHER, ERNST, DR.