EP0577211B1 - Elektrodenlose Niederdruckentladungslampe - Google Patents

Elektrodenlose Niederdruckentladungslampe Download PDF

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Publication number
EP0577211B1
EP0577211B1 EP93201869A EP93201869A EP0577211B1 EP 0577211 B1 EP0577211 B1 EP 0577211B1 EP 93201869 A EP93201869 A EP 93201869A EP 93201869 A EP93201869 A EP 93201869A EP 0577211 B1 EP0577211 B1 EP 0577211B1
Authority
EP
European Patent Office
Prior art keywords
lamp
core
lamp vessel
rod
tube
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
EP93201869A
Other languages
English (en)
French (fr)
Other versions
EP0577211A1 (de
Inventor
Petrus Hendrikus Antonis
Hendrik Jan Eggink
Winand Hendrik Anna Maria Friederichs
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.)
Koninklijke Philips NV
Original Assignee
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 Koninklijke Philips Electronics NV, Philips Electronics NV filed Critical Koninklijke Philips Electronics NV
Priority to EP93201869A priority Critical patent/EP0577211B1/de
Publication of EP0577211A1 publication Critical patent/EP0577211A1/de
Application granted granted Critical
Publication of EP0577211B1 publication Critical patent/EP0577211B1/de
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
    • 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
    • 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

Definitions

  • the invention relates to an electrodeless low-pressure discharge lamp which may dissipate a power of at least 40 W comprising:
  • Such an electrodeless low-pressure discharge lamp is known from EP 0 456 289-A1 and also from US 5 006 752.
  • the tube in the known lamp runs through substantially the entire lamp vessel length.
  • the core with the coil lies in a zone situated at the end of the tube which lies inside the lamp vessel. A good transfer of the power into the ionizable filling is obtained thereby.
  • the known lamp is of a type which dissipates a comparatively high power, for example, approximately 80 to 90 W. Heat is generated during lamp operation, which heat should be removed in order to prevent the core assuming a temperature close to, or even above its Curie point. This is because the specific magnetic losses increase strongly with temperatures rising up to the Curie point, while the magnetic permeability decreases.
  • the known lamp comprises a hollow pipe containing a liquid as the heat-conducting element.
  • the liquid evaporates in a zone of the pipe situated in the core and the vapour condenses in a zone outside the lamp vessel.
  • the condensation heat is transmitted to the surroundings by the flange.
  • gauze is present in the pipe so as to provide a capillary structure which sucks the liquid upwards.
  • the known tube provided with liquid and gauze has a very high heat-transporting capability, so that it is possible for the lamp to dissipate a comparatively high electric power with a comparatively high efficacy.
  • a disadvantage of the known lamp, however, is that the pipe is an expensive component.
  • the invention has for its object to provide a lamp of the kind described in the opening paragraph which is of a simple construction in which the necessity of the use of a pipe provided with liquid and gauze as the heat-conducting element is avoided.
  • this object is achieved in that the coil and the core are present in a zone of the tube which adjoins the flared portion, the zone extending over a small distance inside the lamp vessel in the direction of the tube, the element is a solid rod and the rod is laterally coupled to the core by means of an elastic material.
  • the lateral coupling between the rod and the core for example ferrite, for example the ferrite 4C6 available under the registered trademark Philips, by means of an elastic material, however, provides a good heat transfer while the dimensional tolerances and the compensation of different coefficients of thermal expansion are maintained.
  • Positioning of the coil and the use of the elastic material render possible the use of a comparatively inexpensive solid rod, for example made of metal such as copper or aluminium, or of thermally conducting ceramic material such as, for example, aluminium nitride, which has a thermal conductivity level equal to that of aluminium.
  • the lamp according to the invention with its detachable power coupler renders it possible to exchange the lamp vessel for another, for example, when the lamp vessel has been broken or a light colour different from the original one is desired, without in such cases the entire lamp having to be discarded.
  • the lamp is indeed capable of burning several tens of thousands of hours, for example 60000 hours, with a good luminous efficacy maintainance.
  • the rod has a flange, for example made of copper, aluminium, or brass, for example of CuZn 15 , with a surface narrowing, for example conically, towards the rod.
  • the flange has a surface which faces away from the rod and which is permanently plane for making contact with the surroundings.
  • the rod and the flange have a better heat contact thereby, while the weight of the lamp is less than in the case in which the flange were a cylindrical slice of the same height.
  • the rod and the flange may be united by an interference fit, or alternatively by a fastening with solder, glue or cement, or by a shrunk or clamped connection of the flange around the rod. Another alternity is for the rod to be screwed into the flange, or for the flange to be integral with the rod.
  • the tube extending in the lamp vessel has a length usual for the known lamp, i.e. an excess length for the power coupler of the lamp according to the invention. This has the advantage that the lamp vessel of the lamp according to the invention can also be used for the known lamp with its comparatively long power coupler.
  • An elastic polymer may be used, for example, rubber such as, for example, silicone rubber as the elastic material for coupling the rod to the core.
  • the ionizable filling may comprise, for example, argon, neon, xenon, or mixtures of rare gases, and possibly mercury.
  • the lamp vessel may have a coating of fluorescent powder, for example, in the case in which the filling comprises mercury.
  • the electrodeless low-pressure discharge lamp has a lamp vessel 1 which is closed in a vacuumtight manner and comprises a neck-shaped end portion 2.
  • the lamp vessel has an ionizable filling, of mercury and rare gas in the Figure, and a fluorescent powder 4 at an inner surface. Fused to the lamp vessel there is, at its end portion 2, a tube 5 which extends into the lamp vessel, and which comprises a flared portion 6 fused to the lamp vessel and connected thereto a cylindrical portion 7.
  • a power coupler 20 is detachably fastened to the lamp vessel 1.
  • the power coupler has a core 21 of soft magnetic material in the tube 5, an electric coil 22 around the core 21, and a heat-conducting element 23 in the core 21.
  • the element extends to outside the lamp vessel 1 and carries a flange 24 there.
  • the lamp may dissipate a power of at least 40 W.
  • the coil 22 and the core 21 are present in a zone 8 of the tube 5 which adjoins the flared portion 6, the zone 8 extending over a small distance inside the lamp vessel 1 in the direction of the tube 5;
  • the element 23 is a solid rod, and the rod 23 is laterally coupled to the core 21 by an elastic material 25.
  • the packing with the elastic material provides a good heat transfer from the core to the rod.
  • the flange 24 has a surface 27 which narrows towards the rod 23.
  • the flange 24 is made of copper and integral with the rod 23.
  • the elastic material 25 in the Figure is silicone rubber.
  • a synthetic resin collar 9 is fixed around the neck-shaped portion 2 of the lamp vessel by means of cement 10.
  • the flange 24 carries hooks 28 by which the power coupler 20 is detachably fastened to the lamp vessel 1.
  • the tube 7 Compared with the power coupler, the tube 7 has an excess length.
  • the lamp shown may dissipate a power of, for example, 40 to 85 W, depending on its dimensions.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Discharge Lamps And Accessories Thereof (AREA)

Claims (4)

  1. Elektrodenlose Niederdruck-Entladungslampe, die eine Leistung von zumindest 40 W abgeben kann, mit:
    einem vakuumdicht verschlossenen Lampengefäß (1), das einen halsförmigen Endabschnitt (2) umfaßt, welches Lampengefäß
    eine ein Edelgas enthaltende ionisierbare Füllung hat, und
    an seinem Endabschnitt (2) eine Röhre (5) hat, die sich in das Lampengefäß erstreckt und die einen mit dem Lampengefäß verschmolzenen, konisch zulaufenden Abschnitt (6) und damit verbunden einen zylindrischen Abschnitt (7) umfaßt;
    einem an dem Lampengefäß (1) lösbar befestigten Leistungskoppler (20), welcher Koppler in der Röhre (5) folgendes umfäßt:
    einen Kern (21) aus weichmagnetischem Material,
    eine elektrische Spule (22) um den Kern (21) herum und
    ein wärmeleitendes Element (23) in dem Kern (21), welches Element sich bis außerhalb des Lampengefäßes erstreckt und dort einen Flansch (24) trägt,
       dadurch gekennzeichnet, daß
       die Spule (22) und der Kern (21) sich in einer Zone (8) der Röhre (5) befinden, die an den konisch zulaufenden Abschnitt (6) grenzt, wobei sich die Zone (8) über einen kleinen Abstand innerhalb des Lampengefäßes (1) in Richtung der Röhre (5) erstreckt, das Element (23) ein massiver Stab ist und der Stab (23) mittels eines elastischen Materials (25) seitlich mit dem Kern (21) gekoppelt ist.
  2. Elektrodenlose Niederdruck-Entladungslampe nach Anspruch 1, dadurch gekennzeichnet, daß der Flansch (24) eine Oberfläche (27) hat, die sich zum Stab (23) hin verschmälert.
  3. Elektrodenlose Niederdruck-Entladungslampe nach Anspruch 2, dadurch gekennzeichnet, daß der Flansch (24) mit dem Stab (23) ein einziges Teil bildet.
  4. Elektrodenlose Niederdruck-Entladungslampe nach Anspruch 1, dadurch gekennzeichnet, daß das elastische Material (25) Silicongummi ist.
EP93201869A 1992-07-03 1993-06-28 Elektrodenlose Niederdruckentladungslampe Expired - Lifetime EP0577211B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP93201869A EP0577211B1 (de) 1992-07-03 1993-06-28 Elektrodenlose Niederdruckentladungslampe

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP92202026 1992-07-03
EP92202026 1992-07-03
EP93201869A EP0577211B1 (de) 1992-07-03 1993-06-28 Elektrodenlose Niederdruckentladungslampe

Publications (2)

Publication Number Publication Date
EP0577211A1 EP0577211A1 (de) 1994-01-05
EP0577211B1 true EP0577211B1 (de) 1997-09-03

Family

ID=26131531

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93201869A Expired - Lifetime EP0577211B1 (de) 1992-07-03 1993-06-28 Elektrodenlose Niederdruckentladungslampe

Country Status (1)

Country Link
EP (1) EP0577211B1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69609819T2 (de) * 1995-12-21 2001-03-15 Koninklijke Philips Electronics N.V., Eindhoven Elektrodenlose niederdruckentladungslampe

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3936686A (en) * 1973-05-07 1976-02-03 Moore Donald W Reflector lamp cooling and containing assemblies
NL8401878A (nl) * 1984-06-14 1986-01-02 Philips Nv Elektrodeloze lagedrukontladingslamp.
EP0361047B1 (de) * 1988-09-30 1995-11-22 Thomson Tubes Electroniques Wanderfeldröhre
NL8900406A (nl) * 1989-02-20 1990-09-17 Philips Nv Elektrodeloze lagedrukontladingslamp.
US5291091A (en) * 1991-01-25 1994-03-01 U.S. Philips Corporation Electrodeless low-pressure discharge
US5258683A (en) * 1991-01-25 1993-11-02 U.S. Philips Corporation Electrodeless low-pressure discharge lamp

Also Published As

Publication number Publication date
EP0577211A1 (de) 1994-01-05

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