EP0154383B1 - Electrode chauffable pour lampes à gaz à décharge à haute pression - Google Patents

Electrode chauffable pour lampes à gaz à décharge à haute pression Download PDF

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Publication number
EP0154383B1
EP0154383B1 EP85200312A EP85200312A EP0154383B1 EP 0154383 B1 EP0154383 B1 EP 0154383B1 EP 85200312 A EP85200312 A EP 85200312A EP 85200312 A EP85200312 A EP 85200312A EP 0154383 B1 EP0154383 B1 EP 0154383B1
Authority
EP
European Patent Office
Prior art keywords
coil
electrode
wire
metal wire
helix
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
Application number
EP85200312A
Other languages
German (de)
English (en)
Other versions
EP0154383A2 (fr
EP0154383A3 (en
Inventor
Hans-Günther Ganser
Ralf Dr. Schäfer
Hans-Peter Dr. Stormberg
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 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 Patentverwaltung GmbH, Philips Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Philips Patentverwaltung GmbH
Publication of EP0154383A2 publication Critical patent/EP0154383A2/fr
Publication of EP0154383A3 publication Critical patent/EP0154383A3/de
Application granted granted Critical
Publication of EP0154383B1 publication Critical patent/EP0154383B1/fr
Expired 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 heatable electrode for igniting and reigniting high-pressure gas discharge lamps, consisting of a self-supporting cylindrical open filament made of tungsten or molybdenum wire with a metal wire made of tungsten or molybdenum coaxially guided through the filament and connected to it.
  • Such electrodes serve to reduce the ignition voltage of gas discharge lamps.
  • the heating of the electrode can either be maintained during the entire lamp operation or can be switched off after the lamp has been ignited.
  • the filament In an electrode of this type known from DE-OS-3 106 201 for the hot re-ignition of high-pressure 400W mercury vapor lamps, the filament consists of relatively thick wire and its individual turns are pulled apart so that they do not touch one another. At the outermost turn, the helix wire merges with the metal wire guided coaxially through the helix without changing the cross-section. For preheating, the entire electrode is heated evenly, which requires relatively high currents in the thick filament wire, but which may only flow through the melts of the lamp ends in the case of high-power lamps.
  • the known heatable electrodes are also due to their relatively large dimensions for so-called miniaturized gas discharge lamps, i. H. Gas discharge lamps with a power up to about 70 W, not suitable.
  • the invention is therefore based on the object of providing a heatable electrode for high-pressure gas discharge lamps which is of compact design, requires little heating power and cannot be damaged by the discharge arc attacking during ignition.
  • the metal wire passed through the helix has a smaller diameter than the helix wire, i. H. has a higher specific electrical resistance than the filament, it is strongly heated when this electrode is preheated and set in a red-hot state.
  • This effect is further supported in that the turns of the helix lie against one another, so that the electrical resistance of the helix to that of the metal wire guided by the helix can be neglected.
  • the heating of the metal wire in the helix leads to heating of the outermost turn of the helix due to heat conduction, so that this too becomes red-hot. For this reason, during the subsequent ignition, the discharge arc starts on the filament and not on the thin metal wire, since it ends before the outermost turn of the filament.
  • Such a heatable electrode is well suited for miniaturized gas discharge lamps, in particular metal halide discharge lamps.
  • the metal wire is independent of the helix wire and, with its helix end, is clamped between two turns of the helix.
  • the metal wire is expediently clamped in the area of the outer turns of the helix, in particular between its second and third turns.
  • the metal wire can also be attached to the coil by spot welding.
  • the metal wire is designed as an extension of the helix wire and is etched to a smaller diameter up to the outermost turn of the helix. This has the advantage that the helix and the metal wire consist of one piece.
  • the individual windings 3 of the coil 1 lie close together.
  • Coaxial through the coil 1 is a metal wire 4 made of z. B. tungsten, which has a smaller diameter than the helical wire 2.
  • This coaxially through the helix 1 guided metal wire 4 is bent at its front end 5 and possibly flattened and clamped between two turns 3 of the helix 1, in particular between its second and third turns. The outermost turn is labeled 6.
  • the electrode shown in FIGS. 3 and 4 is constructed similarly to the electrode according to FIGS. 1 and 2. In this case, however, the helix wire end 7 of the outermost turn 6 is bent back and passed coaxially through the helix 1 as an extension of the helix wire 2.
  • the thin metal wire 4 or 8 When the electrodes described are heated, the thin metal wire 4 or 8 first heats up. The outermost turn 6 of the filament 1 then heats up due to heat conduction. When a high-pressure gas discharge lamp provided with such electrodes is ignited, the discharge arc therefore immediately sets on Helix 1 on. Destruction of the metal wire 4 or 8 is therefore impossible.
  • the filament consisted of five turns of tungsten wire with a wire diameter of 180 ⁇ m and an inner diameter of 500 ⁇ m.
  • a tungsten wire with a diameter of 50 to 100 1 1m was clamped between the second and third turns of the coil.
  • Such electrodes were installed in the bulbs of miniaturized high-pressure gas discharge lamps, which have a volume of approximately 0.25 cm 3 and an electrode spacing of approximately 0.5 cm.
  • the flasks were filled with 1 mg Hg and an inert gas pressure of 2666 10 4 Pa (200 torr), as well as different metal halide compositions. If the electrodes are heated to approx. 3000 K, these lamps ignite without an ignition pulse at a supply voltage of 220 V. Some lamps without preheating, however, could not be ignited even with ignition pulses of 4.5 kV.

Claims (4)

1. Electrode chauffable pour l'amorçage et le réamorçage de lampes à décharge dans le gaz à haute pression constituée par un filament ouvert cylindrique autoportant (1) en fil de tungstène ou de molybdène (2) et un fil metallique (4, 8) de tungstène ou de molybdène traversant coaxialement le filament et relié à ce dernier, caractérisée en ce que les spires (3) du filament (1) sont disposées les unes contre les autres et le fil métallique (4, 8) traversant coaxialement le filament présente un plus petit diamètre que le fil (2) du filament et que ce fil métallique mince se termine avant la spire extrême (6) du filament.
2. Electrode selon la revendication 1, caractérisée en ce que le fil métallique (4) est indépendant du fil (2) du filament et est serré par son extrémité du côté filament entre deux spires (3) du filament (1).
3. Electrode selon la revendication 2,
caractérisée en ce que le fil métallique (4) est serré dans la région des spires extrêmes (3) du filament (1), notamment entre les deuxième et troisième spires de ce dernier.
4. Electrode selon la revendication 1,
caractérisée en ce que le fil métallique (8) est sous forme d'un prolongement du fil (2) du filament et est décapé jusqu'avant la spire extrême (6) du filament (1) de façon à présenter un plus petit diamètre.
EP85200312A 1984-03-08 1985-03-04 Electrode chauffable pour lampes à gaz à décharge à haute pression Expired EP0154383B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19843408431 DE3408431A1 (de) 1984-03-08 1984-03-08 Heizbare elektrode fuer hochdruck-gasentladungslampen
DE3408431 1984-03-08

Publications (3)

Publication Number Publication Date
EP0154383A2 EP0154383A2 (fr) 1985-09-11
EP0154383A3 EP0154383A3 (en) 1986-11-26
EP0154383B1 true EP0154383B1 (fr) 1989-10-04

Family

ID=6229862

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85200312A Expired EP0154383B1 (fr) 1984-03-08 1985-03-04 Electrode chauffable pour lampes à gaz à décharge à haute pression

Country Status (4)

Country Link
US (1) US4839560A (fr)
EP (1) EP0154383B1 (fr)
JP (1) JPS60207240A (fr)
DE (2) DE3408431A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19538283A1 (de) * 1995-10-16 1997-04-17 Holzer Walter Prof Dr H C Ing Kaltkathoden für Gasentladungslampen
US20070035249A1 (en) * 2005-08-10 2007-02-15 Geza Cseh Lamp with inner capsule
DE202005014660U1 (de) * 2005-09-16 2005-12-08 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Hochdruckentladungslampe mit Entladungsgefäß

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1157995A (en) * 1914-09-11 1915-10-26 Gen Electric Incandescent lamp.
GB1071102A (en) * 1963-08-16 1967-06-07 Sylvania Electric Prod Electric discharge lamp
US3519872A (en) * 1967-05-17 1970-07-07 Westinghouse Electric Corp Thermionic electrode with an auxiliary starting coil for a discharge lamp
GB2073944B (en) * 1980-02-20 1985-02-06 Mitsubishi Electric Corp High pressure discharge lamp

Also Published As

Publication number Publication date
DE3573492D1 (en) 1989-11-09
EP0154383A2 (fr) 1985-09-11
JPS60207240A (ja) 1985-10-18
EP0154383A3 (en) 1986-11-26
DE3408431A1 (de) 1985-09-12
US4839560A (en) 1989-06-13

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