EP0446462A2 - Lampe à décharge à haute pression - Google Patents

Lampe à décharge à haute pression Download PDF

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Publication number
EP0446462A2
EP0446462A2 EP90124463A EP90124463A EP0446462A2 EP 0446462 A2 EP0446462 A2 EP 0446462A2 EP 90124463 A EP90124463 A EP 90124463A EP 90124463 A EP90124463 A EP 90124463A EP 0446462 A2 EP0446462 A2 EP 0446462A2
Authority
EP
European Patent Office
Prior art keywords
power supply
pressure discharge
discharge lamp
lamp according
shielding wire
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Withdrawn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
EP90124463A
Other languages
German (de)
English (en)
Other versions
EP0446462A3 (en
Inventor
Jürgen Dr. Heider
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 EP0446462A2 publication Critical patent/EP0446462A2/fr
Publication of EP0446462A3 publication Critical patent/EP0446462A3/de
Withdrawn legal-status Critical Current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
    • H01J61/30—Vessels; Containers
    • H01J61/34—Double-wall vessels or containers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/36—Seals between parts of vessels; Seals for leading-in conductors; Leading-in conductors

Definitions

  • the invention relates to a high-pressure discharge lamp according to the preamble of protection claim 1.
  • GB-PS 1 233 955 discusses the problem that, in the case of high-pressure discharge lamps which have metal-containing filler additives, positive metal ions are generated in the discharge vessel during operation and can diffuse through the wall of the discharge vessel. If current-carrying parts run in the vicinity of the discharge vessel, their electrical fields greatly promote ion migration. In addition, photoelectrons are released from these electrical conductors by the UV radiation generated during the discharge, which drift towards the wall of the discharge vessel and also promote ion migration. The diffusion process leads to losses in the metal-containing additives and thus to a change in the filling composition, which manifests itself in an unstable burning behavior of the high-pressure discharge lamp.
  • This ion migration occurs in particular in high-pressure discharge lamps with a discharge vessel made of quartz glass and metal halide additives in the filling, in which metal ions with a small ion radius, such as sodium ions, are formed under discharge conditions. Diffuse during operation of the lamp, favored by external electrical fields, positively charged sodium ions through the wall of the discharge vessel, so that an excess of iodine remains in it. Due to the electronegative behavior of the excess iodine, there are also difficulties in the ignition of the high-pressure discharge lamp and an increase in the operating voltage.
  • a shielding electrode is proposed in GB-PS 1 223 955, whereby another problem arises here, namely that electrical breakdowns can occur between the shielding electrode and the current supply running parallel to it.
  • DE-OS 37 35 523 discloses a high-pressure discharge lamp with a base on one side and an outer bulb and a two-ended arrangement axially arranged therein Discharge vessel is known, the current supply leading to the base-free end of the discharge vessel has a casing made of an insulating material (eg glass). A shielding electrode is not provided here. This sheath does not shield the electrical field of this power supply from the ions in the gas discharge, so that here too the ion migration is reduced but is not prevented to the desired extent.
  • an insulating material eg glass
  • the invention has for its object to provide a high-pressure discharge lamp with reduced ion migration, which has a satisfactory ignition behavior and a sufficiently constant operating voltage over the service life.
  • the sheaths consist of an electrically insulating material, preferably with high dielectric constants, the influence of the electrical fields of the shielding wire and the second power supply, which is favorable for the ion migration, occurs in the immediate vicinity of the discharge vessel are reduced.
  • the GB-PS 1 223 955 shows a wrong way in comparison, since it tries to solve the problems described above by a combination of different effects to solve, but which lead to serious disadvantages in lamp operation.
  • the sheaths of the shielding wire and the second power supply also prevent photoelectrons from negatively charging the discharge vessel wall, on the one hand by weakening the UV radiation, which contributes significantly to the photoeffect, and on the other hand, they are impermeable to photoelectrons, so that these are finally directed back onto the electrical conductor and from be dissipated.
  • the present invention offers the particularly advantageous possibility of dispensing with a filling gas in the outer bulb, which would reduce the mean free path of the photoelectrons but would impair the thermal insulation of the discharge vessel.
  • a common sheath for the shielding wire and the second power supply allows a space-saving spatial arrangement of these parts without electrical breakdowns occurring between them.
  • this design of the sheathing ensures mechanical stabilization of the shielding wire.
  • High-pressure discharge lamps according to the invention show a more stable burning behavior and a longer service life than conventional high-pressure discharge lamps.
  • the discharge vessel can consist of quartz glass or a translucent ceramic.
  • the invention can be used particularly advantageously in the case of high-pressure discharge lamps which have fillings which, during operation, give rise to alkali ions, especially Na and / or Li ions.
  • FIG. 1 shows a 250 watt metal halide discharge lamp with an evacuated outer bulb 1, a base 2, a frame 3 for holding the discharge vessel 4 and a getter 5.
  • the axially aligned discharge vessel 4 has a base near 6 and a base distal end 7 and electrodes 8, 9. Inside the discharge vessel 4 there is a filling which, in addition to an inert gas and mercury, also contains additions of NaJ, DyJ3, HoJ3, TmJ3 and TlJ.
  • the ends 6, 7 of the discharge vessel 4 have coatings 10 made of a heat-insulating material.
  • a first power supply 11 leads to the end 6 near the base, which electrically contacts the electrode 8 with the voltage source via the lamp power supply 11a.
  • a second power supply line 12 runs along the discharge vessel 4 and connects to the is connected to the base distal end 7 and ensures the voltage supply to the electrode 9 via the lamp power supply 12a.
  • a shielding wire 13 with an inflection point 13b, an angled region 13a and an end 13c remote from the base is arranged parallel to the power supply 12.
  • the angled region 13a and the first power supply 11 are connected to one another in an electrically conductive manner.
  • Shielding wire 13 and power supply 12 are partially surrounded by an Al2O3 ceramic body 14.
  • the one-piece, electrically insulating ceramic body 14 is continued in the second power supply 12 and the shielding wire 13 beyond its end 13c remote from the base.
  • the ceramic body 14 is continued in the second power supply 12 beyond the break point 13b, in the direction of the base 2. Both measures serve to avoid electrical breakdowns due to the particularly high electrical field strength at the break point 13b and at the end 13c of the shielding wire 13 remote from the base.
  • Figure 2 shows a cross section through the ceramic body 14 with two channels 15 in the longitudinal direction, which are designed here as bores.
  • the diameter of ceramic body 14 in FIG. 2 is 4.2 mm or 2.2 mm and the channels 15 have a diameter of 1.2 mm.
  • the ceramic body 14 shown in FIG. 3a consists of two separate tubes 17, 18, the tube 17, which surrounds the shielding wire 13, by means of two clips 19 Tube 18, which surrounds the second power supply 12, is mechanically fastened.
  • the ceramic body 14, outlined in FIG. 3b consists of two coaxially arranged tubes 20, 21 which are mechanically connected by means of webs 22.
  • the second power supply line 12 or the shielding wire 13 run in the interior of the tube 20 or in the intermediate space 23.
  • the shielding wire can be divided into several wires.
  • the Al2O3 ceramic body 14 '' '( Figure 3c) has a central channel 24 and five outer channels 25 which are arranged in a circle around this.
  • the second power supply line 12 runs within channel 24, while in each of the channels 25 at most one wire of the shielding wire 13 runs.
  • the wires of the shielding wire unite outside the ceramic body 14, in the vicinity of the break point 13b.

Landscapes

  • Vessels And Coating Films For Discharge Lamps (AREA)
EP19900124463 1990-03-15 1990-12-17 High-pressure discharge lamp Withdrawn EP0446462A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE9002959U DE9002959U1 (de) 1990-03-15 1990-03-15 Hochdruck-Entladungslampe
DE9002959U 1990-03-15

Publications (2)

Publication Number Publication Date
EP0446462A2 true EP0446462A2 (fr) 1991-09-18
EP0446462A3 EP0446462A3 (en) 1992-03-11

Family

ID=6851931

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900124463 Withdrawn EP0446462A3 (en) 1990-03-15 1990-12-17 High-pressure discharge lamp

Country Status (5)

Country Link
US (1) US5248913A (fr)
EP (1) EP0446462A3 (fr)
JP (1) JPH0527956U (fr)
CA (1) CA2037501A1 (fr)
DE (1) DE9002959U1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4342478A1 (de) * 1993-12-13 1995-06-14 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Niederwattige Hochdruckentladungslampe
DE19856602B4 (de) * 1997-12-08 2006-02-23 Koito Manufacturing Co., Ltd. Elektrische Entladungslampeneinrichtung

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4334074A1 (de) * 1993-10-06 1995-04-13 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Metallhalogenidentladungslampe
US5493167A (en) * 1994-05-03 1996-02-20 General Electric Company Lamp assembly with shroud employing insulator support stops
US20020117965A1 (en) * 2001-02-23 2002-08-29 Osram Sylvania Inc. High buffer gas pressure ceramic arc tube and method and apparatus for making same
DE60320389T2 (de) * 2002-03-13 2009-05-14 Koninklijke Philips Electronics N.V. Elektrische schaltung zum zünden einer entladungslampe, bauteilmodul und lampe mit solch einer elektrischen schaltung
SE0701251L (sv) * 2007-05-24 2008-09-09 Auralight Int Ab Högtrycksnatriumlampa
DE102009030308B4 (de) * 2009-06-24 2012-04-12 Osram Gesellschaft mit beschränkter Haftung Hochdruckentladungslampe

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2009221A (en) * 1933-06-24 1935-07-23 Gen Electric Gaseous electric discharge device
GB1223955A (en) * 1969-05-16 1971-03-03 Narva Veb High pressure electric discharge lamp
JPS55143773A (en) * 1979-04-27 1980-11-10 Japan Storage Battery Co Ltd Metal vapor discharge lamp
JPS57138771A (en) * 1981-02-20 1982-08-27 Mitsubishi Electric Corp High pressure discharge lamp
US4734612A (en) * 1985-07-15 1988-03-29 Kabushiki Kaisha Toshiba High pressure metal vapor discharge lamp

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL6703447A (fr) * 1967-03-03 1968-09-04
US3780331A (en) * 1972-09-22 1973-12-18 Westinghouse Electric Corp Apparatus and method for eliminating microcracks in alumina ceramic discharge devices
HU205485B (en) * 1986-10-20 1992-04-28 Tungsram Reszvenytarsasag Metal halogen discharge lamp containing alkali-halogenide additive
US5064395A (en) * 1990-10-01 1991-11-12 Gte Products Corporation Compact outer jacket for low wattage discharge lamp

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2009221A (en) * 1933-06-24 1935-07-23 Gen Electric Gaseous electric discharge device
GB1223955A (en) * 1969-05-16 1971-03-03 Narva Veb High pressure electric discharge lamp
JPS55143773A (en) * 1979-04-27 1980-11-10 Japan Storage Battery Co Ltd Metal vapor discharge lamp
JPS57138771A (en) * 1981-02-20 1982-08-27 Mitsubishi Electric Corp High pressure discharge lamp
US4734612A (en) * 1985-07-15 1988-03-29 Kabushiki Kaisha Toshiba High pressure metal vapor discharge lamp

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 5, no. 15 (E-43)(687) 29. Januar 1981 & JP-A-55 143 773 ( NIPPON DENCHI K. K. ) 10. November 1980 *
PATENT ABSTRACTS OF JAPAN vol. 6, no. 238 (E-144)(1116) 26. November 1982 & JP-A-57 138 771 ( MITSUBISHI DENKI K. K. ) 27. August 1982 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4342478A1 (de) * 1993-12-13 1995-06-14 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Niederwattige Hochdruckentladungslampe
DE19856602B4 (de) * 1997-12-08 2006-02-23 Koito Manufacturing Co., Ltd. Elektrische Entladungslampeneinrichtung

Also Published As

Publication number Publication date
US5248913A (en) 1993-09-28
DE9002959U1 (de) 1990-05-17
EP0446462A3 (en) 1992-03-11
CA2037501A1 (fr) 1991-09-16
JPH0527956U (ja) 1993-04-09

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