EP0704104A1 - Lampe a decharge sous haute pression sans electrode - Google Patents

Lampe a decharge sous haute pression sans electrode

Info

Publication number
EP0704104A1
EP0704104A1 EP95913295A EP95913295A EP0704104A1 EP 0704104 A1 EP0704104 A1 EP 0704104A1 EP 95913295 A EP95913295 A EP 95913295A EP 95913295 A EP95913295 A EP 95913295A EP 0704104 A1 EP0704104 A1 EP 0704104A1
Authority
EP
European Patent Office
Prior art keywords
electrical
heat sink
conductor
pressure discharge
coil
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.)
Ceased
Application number
EP95913295A
Other languages
German (de)
English (en)
Inventor
Johannes Adrianus Josephus Maria Van Vliet
Klaus Löhn
Achim Korber
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
Koninklijke Philips Electronics NV
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, Koninklijke Philips Electronics NV, Philips Electronics NV filed Critical Philips Corporate Intellectual Property GmbH
Priority to EP95913295A priority Critical patent/EP0704104A1/fr
Publication of EP0704104A1 publication Critical patent/EP0704104A1/fr
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/82—Lamps with high-pressure unconstricted discharge having a cold pressure > 400 Torr
    • H01J61/827—Metal halide arc lamps
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/52—Cooling arrangements; Heating arrangements; Means for circulating gas or vapour within the discharge space
    • H01J61/523—Heating or cooling particular parts of the lamp
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J65/00—Lamps without any electrode inside the vessel; Lamps with at least one main electrode outside the vessel
    • H01J65/04—Lamps in which a gas filling is excited to luminesce by an external electromagnetic field or by external corpuscular radiation, e.g. for indicating plasma display panels
    • H01J65/042—Lamps in which a gas filling is excited to luminesce by an external electromagnetic field or by external corpuscular radiation, e.g. for indicating plasma display panels by an external electromagnetic field
    • H01J65/048—Lamps in which a gas filling is excited to luminesce by an external electromagnetic field or by external corpuscular radiation, e.g. for indicating plasma display panels by an external electromagnetic field the field being produced by using an excitation coil

Definitions

  • Electrodeless high-pressure discharge lamp is Electrodeless high-pressure discharge lamp.
  • the invention relates to an electrodeless high-pressure discharge lamp comprising: a light-transmitting lamp vessel which is closed in a vacuumtight manner and which has an ionizable filling; around the lamp vessel, an electric coil with a first and a second outer turn each with an end portion which is electrically connected to a first and a second electrical conductor, respectively, extending away from the coil and designed for connection to an electric supply, which coil has a third turn between the outer turns, the first and the second electrical conductor being thermally connected to a heat sink, while at least one of them is electrically insulated from the heat sink by a body which is an electrical insulator as well as a thermal conductor.
  • cooling is realised in that the electrical conductors are each connected to a heat sink. Heat is thus removed from those conductors through the heat sinks to the environment.
  • the conductor which is the live lead is in thermal contact with the heat sink via an aluminium nitride body here. Aluminium nitride is a good thermal conductor and electrical insulator. This renders said heat sink safe upon contact.
  • the heat sink of the neutral lead may then be integral with the heat sink of the live lead.
  • US 5,039,903 and US 5,042,139 disclose electrodeless high-pressure discharge lamps in which each of the ends of the electric coil is connected via a corresponding heat sink to a ballast, while the electrical conductors extend at a distance from these heat sinks. It is possible in these lamps to circulate water through the coil for cooling the coil. A disadvantage of this is that supply and drain lines are necessary, which requires a drive and the associated power consumption.
  • US 4,910,439 discloses an electrodeless high-pressure discharge lamp in which a forced air flow cools the electric coil. This lamp has the disadvantage that a motor and ducts are necessary for cooling, as well as a power requirement.
  • the measure in the lamp according to the invention also draws heat away from the coil in a location far removed from the end portions of the outer turns.
  • the central turn is chosen to be the third turn in a lamp having an odd number of turns, then this location may even be the location farthest removed from the end portions. Additional turns may be connected to a heat sink, if so desired, in coils having more than three turns.
  • the third electrical conductor is also connected to a heat sink with electrical conduction and is at earth potential during operation, while the first and the second electrical conductor are each connected to a heat sink with electrical insulation by means of a body which is an electrical insulator as well as a thermal conductor.
  • the first and the second electrical conductor are then the plus and the minus conductor.
  • the embodiment has the advantage that the heat sink connected to the third electrical conductor is safe to touch.
  • the first and the second electrical conductor may have potentials which are symmetrical relative to earth potential, if the third turn is the central turn of a coil, or alternatively asymmetrical.
  • the electrical conductors may all be coupled to the same heat sink.
  • the lamp is coupled to a light waveguide, for example, to a light pipe.
  • aluminium nitride is used as the electrical insulator and thermal conductor. Aluminium nitride combines a comparatively high electrical resistivity of approximately 10 12 ⁇ m with a comparatively high thermal conductivity of approximately 150 Wm ⁇ K '1 . This renders it highly suitable for use in the thermal, but not electrical connection between a live electrical conductor and an electrically conducting body.
  • the electrodeless high-pressure discharge lamp according to the invention can have a compact shape, in which the use of a fluid, such as air or water, and of the associated circulation means is avoided. Nevertheless, ohmic losses and damage to the electrical supply to be used are effective counteracted.
  • Embodiments of the electrodeless high-pressure discharge lamp according to the invention are shown in the drawing, in which:
  • Fig. 1 shows a lamp in perspective view
  • Fig. 2 is a diagrammatic cross-section taken on II-II in Fig. 1;
  • Fig. 3 is a diagrammatic cross-section taken on ⁇ i-III in Fig. 1;
  • Fig. 4 shows a modification of the coil of Fig. 1 in plan view
  • Fig. 5 shows the coil of Fig. 4 along the line V in this Figure
  • Fig. 6 is a cross-section of a second embodiment seen as in Fig. 2
  • Fig. 7 is a cross-section of the second embodiment seen as in Fig. 3;
  • Fig. 8 is a cross-section of a third embodiment.
  • the electrodeless high-pressure discharge lamp has a light- transmitting lamp vessel 1 which is closed in a vacuumtight manner and which is made, for example, of quartz glass with a volume of 2 cm 3 , but alternatively of ceramic material such as, for example, aluminium oxide.
  • the lamp vessel contains an ionizable filling, for example, of 2.5 mg Nal, 1.5 mg Cel 3 , and 125 mbar Xe.
  • An electric coil 2 for example made of copper, is present around the lamp vessel, with a first and a second outer turn 3, 4 each having an end portion 5, 6.
  • the end portions are electrically connected to a first 7 and second electrical conductor 8, respectively, which extend away from the coil and are designed for connection to an electrical supply.
  • the coil 2 has a third turn 9 between the outer turns 3, 4.
  • the first and the second electrical conductor 7, 8 are thermally connected to a heat sink 10, and at least one of them is electrically insulated from the heat sink 10 by means of a body 11 which is an electrical insulator as well as a thermal conductor.
  • the third tum 9 is connected to a third electrical conductor 12 which extends away from the coil and is connected at least thermally to a heat sink 13.
  • the third electrical conductor 12 is also connected to a heat sink 13 with electrical conduction and is at earth potential (see Fig. 3), while the first and the second electrical conductor 7, 8 are both connected to a heat sink 10 (see Fig. 2) in an electrically insulating manner via a body 11 which is an electrical insulator as well as a thermal conductor, and which is made of aluminium nitride in the Figure.
  • the lamp vessel 1 is accommodated in a housing 20 with a reflector 21 which is closed off with a grid 22 of metal wire.
  • the heat sink 10, 13 has fins 10a, 13a for an improved heat transfer to the surroundings.
  • the lamp according to the invention exhibits no or a strongly retarded blackening. This already shows the reduced temperature of the coil during operation.
  • the conductors 7, 8 are made, for example, of copper and are clamped in in the heat sink 10 between aluminium nitride bodies 11 . They may be connected to a supply via an isolating transformer and may thus be given a positive and negative potential in relation to earth potential.
  • the third electrical conductor 12 for example made of copper, is connected to metal plates 13b of the heat sink 13 with thermal and electrical conduction.
  • the heat sink, and thus the third conductor, is at earth potential.
  • the coil is made from a copper plate.
  • An end portion 9a of the third turn 9 is held clamped in by the third electrical conductor 12, which is clamped in in the heat sink 13 between aluminium nitride bodies 14.
  • the first electrical conductor 7 (Fig. 6) is clamped in between metal plates 10b in the heat sink and is connected thereto with electrical and thermal conduction.
  • the second electrical conductor 8 is enclosed between aluminium nitride bodies in the heat sink, connected thereto with thermal conduction but with electrical insulation.
  • the third electrical conductor 12 (Fig. 7) is connected to a heat sink 13 so as to be electrically insulated and thermally conducting, via a body 14 which is an electrical insulator and a thermal conductor.
  • the lamp vessel 1 has a coating 1' of ZrC ⁇ at a surface so as to be light-reflecting there.
  • the lamp shown has only one heat sink 10, 13 to which the first conductor is thermally and electrically connected, while the second conductor is connected thereto with thermal conduction and electrical insulation via the body 11, and the third conductor also with thermal conduction and electrical insulation via the body 14.
  • a reflector 21 is present in the heat sink and is in close contact therewith.
  • a light pipe merges into the reflector.
  • the electrical supply unit for the lamp may be accommodated in a housing 26.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
  • Discharge Lamps And Accessories Thereof (AREA)

Abstract

Cette lampe à décharge sous haute pression sans électrode comprend une enceinte de lampe (1), qui est entourée par un serpentin électrique (2). Ce serpentin (2) possède des première et seconde spires externes (3, 4), ainsi qu'une troisième spire (9) entre elles. Les spires externes sont couplées thermiquement à un puits de chaleur (10), le couplage d'au moins l'une de ces spires étant fait de façon à isoler électriquement la spire en question. La troisième spire (9) est également couplée à un puits de chaleur (13), éventuellement d'une façon électroconductrice et au potentiel terrestre. Un refroidissement amélioré du serpentin est ainsi obtenu.
EP95913295A 1994-04-14 1995-04-06 Lampe a decharge sous haute pression sans electrode Ceased EP0704104A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP95913295A EP0704104A1 (fr) 1994-04-14 1995-04-06 Lampe a decharge sous haute pression sans electrode

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP94201022 1994-04-14
EP94201022 1994-04-14
PCT/IB1995/000241 WO1995028734A1 (fr) 1994-04-14 1995-04-06 Lampe a decharge sous haute pression sans electrode
EP95913295A EP0704104A1 (fr) 1994-04-14 1995-04-06 Lampe a decharge sous haute pression sans electrode

Publications (1)

Publication Number Publication Date
EP0704104A1 true EP0704104A1 (fr) 1996-04-03

Family

ID=8216802

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95913295A Ceased EP0704104A1 (fr) 1994-04-14 1995-04-06 Lampe a decharge sous haute pression sans electrode

Country Status (4)

Country Link
EP (1) EP0704104A1 (fr)
JP (1) JPH08511908A (fr)
CN (1) CN1128581A (fr)
WO (1) WO1995028734A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100451359B1 (ko) * 2002-03-06 2004-10-06 주식회사 엘지이아이 마이크로 웨이브를 이용한 조명기기

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5498937A (en) * 1993-02-16 1996-03-12 U.S. Philips Corporation Electrodeless high-pressure discharge lamp having coil supports of aluminum nitride supporting individual coil turns
EP0612100B1 (fr) * 1993-02-16 1996-08-21 Koninklijke Philips Electronics N.V. Lampe à décharge à haute pression sans électrodes

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9528734A1 *

Also Published As

Publication number Publication date
CN1128581A (zh) 1996-08-07
JPH08511908A (ja) 1996-12-10
WO1995028734A1 (fr) 1995-10-26

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