EP0594245A1 - Ensemble d'illumination, lampe à décharge basse pression sans électrode et bobine apte à l'utilisation dans ce type de lampe - Google Patents

Ensemble d'illumination, lampe à décharge basse pression sans électrode et bobine apte à l'utilisation dans ce type de lampe Download PDF

Info

Publication number
EP0594245A1
EP0594245A1 EP93202877A EP93202877A EP0594245A1 EP 0594245 A1 EP0594245 A1 EP 0594245A1 EP 93202877 A EP93202877 A EP 93202877A EP 93202877 A EP93202877 A EP 93202877A EP 0594245 A1 EP0594245 A1 EP 0594245A1
Authority
EP
European Patent Office
Prior art keywords
winding
turns
coil
illumination unit
lamp
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.)
Granted
Application number
EP93202877A
Other languages
German (de)
English (en)
Other versions
EP0594245B1 (fr
Inventor
Petrus Hendrikus Antonis
Jacob Schlejen
Leonardus Urbanus Emile Konings
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 EP19930202877 priority Critical patent/EP0594245B1/fr
Publication of EP0594245A1 publication Critical patent/EP0594245A1/fr
Application granted granted Critical
Publication of EP0594245B1 publication Critical patent/EP0594245B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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

Definitions

  • the invention relates to an illumination unit comprising an electrodeless low-pressure discharge lamp and a high-frequency electric supply device, which lamp is provided with a discharge vessel sealed in a gastight manner and containing an ionizable filling and with a coil comprising turns of a primary winding and of a secondary winding, which supply device is provided with input terminals, with an output terminal which is electrically neutral with respect to mass and which is connected to a first end of the primary winding, and with a further output terminal which is connected to a second end of the primary winding, a high-frequency magnetic field being generated by the primary winding in a nominal operating condition, which field maintains an electric discharge in the discharge vessel and induces a potential gradient in the secondary winding in a direction from a first end which is electrically neutral with respect to mass to a second, free end of the secondary winding, which gradient is oppositely directed to the potential gradient from the first to the second end in the primary winding.
  • the invention also relates to an electrodeless low-pressure discharge lamp suitable for use in the illumination unit.
  • the invention further relates to a coil suitable for use in the illumination unit.
  • Such an illumination unit is known from EP 0.162.504 A1.
  • the discharge vessel of the lamp of this illumination unit has a luminescent layer at the inside and is provided with a filling comprising mercury.
  • the coil which has 13 turns in a primary winding over a length of 25 mm and 14.5 turns in a secondary winding over a length of 30 mm, is provided around a core of soft magnetic material of 50 mm length.
  • a potential distribution across the coil resulting from the potential gradient occurring in each of the windings causes an electric field which is of importance for lamp ignition.
  • the asymmetrical supply device used in the illumination unit where one of the terminals has a potential which at least substantially corresponds to mass and the other has a potential different therefrom, may be comparatively simple compared with a symmetrical supply device, i.e. a supply device with connection terminals which have mutually opposite potentials with respect to mass.
  • a disadvantage of the known illumination unit is that the lamp ignites with comparatively great difficulty compared with a lamp of an illumination unit in which the coil has no secondary winding. This has the result that the ignition circuit is heavily loaded during a prolonged period, which may lead to a reduced operating life. It is true that the ignition time can be shortened by offering a higher ignition voltage, but this renders the use of comparatively expensive components necessary.
  • a further object of the invention is to provide an electrodeless low-pressure discharge lamp suitable for use in such an illumination unit.
  • a yet further object of the invention is to provide a coil suitable for use in such an illumination unit.
  • the illumination unit is for this purpose characterized in that the relative number of turns of the primary winding is at least 3/2 times the relative number of turns of the secondary winding in a first end portion of the coil which comprises half the number of turns of the coil.
  • the term "relative number of turns” in the present description is understood to mean the number of turns of a winding in the first end portion divided by the total number of turns of this winding.
  • the coil of the illumination unit according to the invention has a resulting potential distribution which generates a comparatively strong electric field compared with that of a coil without the measure according to the invention but similar in all other respects. As a result, the lamp of the illumination unit ignites more quickly.
  • the coil of the illumination unit according to the invention may be provided, for example, with a first end portion having turns exclusively of the primary winding and with a second end portion having turns exclusively of the secondary winding.
  • the resulting potential distribution is at least substantially balanced relative to mass, so that the lamp of the illumination unit causes only little interference in the environment and the mains.
  • a preferred embodiment of the illumination unit according to the invention is characterized in that the primary and the secondary winding have the same winding direction.
  • the coil can then be readily manufactured with narrow tolerances.
  • the direction from the first end portion to a further end portion corresponds to the direction from the first to the second end of the secondary winding.
  • the lamp of the illumination unit according to the invention has, for example, a coil whose primary winding and secondary winding approximately overlap one another and are wound with pitches which increase in mutually opposing directions.
  • at least one fourth of the number of turns of each winding extend to beyond the other winding.
  • the turns are wound with constant pitch.
  • the coil is encapsulated in an elastic substance.
  • the turns are then fixed in a simple manner.
  • a first embodiment of the illumination unit according to the invention shown in Fig. 1 comprises an electrodeless low-pressure discharge lamp 10 and a supply device 50.
  • the lamp 10 is provided with a pear-shaped discharge vessel 20 which is sealed in a gastight manner and has an ionizable filling 21 comprising 6 mg mercury and 180 mg of an amalgam of bismuth and indium in a weight ratio of 67:33.
  • the filling 21 in addition comprises argon at a filling pressure of 33 Pa.
  • the lamp 10 is also provided with a coil 30 having a length L s of 55 mm which is accommodated in a recess 22 of the discharge vessel.
  • the coil 30, shown in more detail in Fig. 2 is provided with a total of 14.5 turns 31 of a primary winding 33 and 14.5 turns 32 of a secondary winding 34 around a synthetic-resin coil former 38.
  • the secondary winding has, for example, one or one and a half turn more than the primary winding.
  • the coil former 38 in Fig. 2 is depicted as transparent, and portions of the turns 31, 32 extending behind the coil former 38 are not shown.
  • the primary and the secondary winding 33, 34 have the same winding direction. In this case the two windings 33, 34 are wound clockwise.
  • the coil former 38 encloses a core 35 of soft magnetic material, formed by a rod of Philips 4C6 ferrite with a diameter of 12 mm and a length of 50 mm.
  • the coil has an air core, or the core is made of, for example, a synthetic resin or a ceramic material.
  • the primary and the secondary winding 33, 34 are both made of insulated copper wire with a core thickness of 0.87 mm.
  • the supply device 50 is provided with input terminals 51a,b.
  • the supply device 50 is also provided with an output terminal 52a which is electrically neutral with respect to the mass M and which is connected to a first end 36a of the primary winding 33 via a current supply conductor 53a, and provided with a further output terminal 52b which is connected to a second end 36b of the primary winding 33 via a current supply conductor 53b.
  • the primary winding 33 In a nominal operating condition, the primary winding 33 generates a high-frequency magnetic field which maintains an electric discharge in the discharge vessel 20.
  • a potential gradient is induced in the secondary winding 34 in a direction away from a first end 37a which is electrically neutral with respect to the mass M to a second free end 37b, which gradient is oppositely directed to the potential gradient from the first to the second end 36a,b in the primary winding 33.
  • the potential averaged over the surface of the coil 30 is approximately equal to that of the mass M.
  • the first end 37a of the secondary winding 34 is electrically neutral because it is connected to the first end 36a of the primary winding via a current conductor 53c.
  • the first end 37a may be connected, for example, to the mass M.
  • the relative number of turns 31 of the primary winding 33 is more than 3/2 times the relative number of turns 32 of the secondary winding 34.
  • the first end portion comprises 9.5 of the 14.5 turns 31 of the primary winding 33, and 5 of the 14.5 turns 32 of the secondary winding 34.
  • the relative number of turns 31 of the primary winding 33 in the first end portion 39a of the coil 30, accordingly, is 0.62, which is approximately 1.8 times more than the relative number (0.34) of turns 32 of the secondary winding 34 in the first end portion 39a.
  • the direction from the first end portion 39a to a further end portion 39b corresponds to the direction from the first end 37a to the second end 37b of the secondary winding 34.
  • more than one fourth of the number of turns 31, 32 of each winding 33, 34 extend to beyond the other winding 34, 33.
  • 4.5 of the 14.5 turns 31 of the primary winding 33 extend to beyond the first end 37a of the secondary winding 34
  • 4.5 of the 14.5 turns 32 of the secondary winding 34 extend to beyond the first end 36a of the primary winding 33.
  • the coil 30 is encapsulated in an elastic substance 40 (shown as transparent in the Figure). Q3-3600 silicone resin from Dow Corning was used in this case.
  • the discharge vessel 20 is provided at its inner surface with a layer 23 of green-luminescing terbium-activated cerium-magnesium aluminate and red-luminescing yttrium oxide activated by trivalent europium.
  • a layer is absent and the discharge vessel has a filling comprising an amalgam of sodium and mercury.
  • the discharge vessel 20 is fixed on a carrier 24 of synthetic resin into whose interior a coaxial cable 54 is passed, which cable is connected to the supply device 50 and whose current supply conductors 53a,b form a sheath and a core, respectively.
  • the supply device 50 is connected to connection terminals P, N of the mains by means of current conductors 55a,b.
  • the supply device has a housing 56 which is connected to the mass M via an earthing line 55c.
  • the carrier is provided with a lamp cap at an end remote from the discharge vessel, for example, an Edison lamp cap in which lamp cap contacts are connected to a supply device incorporated in the carrier.
  • the supply device of the embodiment of the illumination unit according to the invention described with reference to the Figures has a frequency of 2.65 MHz.
  • the lamp consumes a power of 70 W and has a light output of 5500 lm during nominal operation.
  • the ignition time of the lamp in this illumination unit was on average twice as short as that of a lamp in an illumination unit not according to the invention with a coil of the same length whose primary and secondary windings lie against one another over substantially the entire length, all other circumstances being equal.
  • the influence on the mains and on the environment was found to be of the same order of magnitude for both illumination units.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Discharge Lamps And Accessories Thereof (AREA)
EP19930202877 1992-10-21 1993-10-13 Ensemble d'illumination et lampe à décharge basse pression sans électrode apte à l'utilisation dans cet ensemble Expired - Lifetime EP0594245B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP19930202877 EP0594245B1 (fr) 1992-10-21 1993-10-13 Ensemble d'illumination et lampe à décharge basse pression sans électrode apte à l'utilisation dans cet ensemble

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP92203222 1992-10-21
EP92203222 1992-10-21
EP19930202877 EP0594245B1 (fr) 1992-10-21 1993-10-13 Ensemble d'illumination et lampe à décharge basse pression sans électrode apte à l'utilisation dans cet ensemble

Publications (2)

Publication Number Publication Date
EP0594245A1 true EP0594245A1 (fr) 1994-04-27
EP0594245B1 EP0594245B1 (fr) 1997-09-17

Family

ID=26131755

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19930202877 Expired - Lifetime EP0594245B1 (fr) 1992-10-21 1993-10-13 Ensemble d'illumination et lampe à décharge basse pression sans électrode apte à l'utilisation dans cet ensemble

Country Status (1)

Country Link
EP (1) EP0594245B1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996013053A2 (fr) * 1994-10-19 1996-05-02 Philips Electronics N.V. Ensemble d'eclairage, lampe a decharge a basse pression depourvue d'electrodes et enceinte de decharge pour ensemble d'eclairage
US5866991A (en) * 1996-07-17 1999-02-02 General Electric Company Induction lamp with oppositely oriented coil winding layers
EP1587134A3 (fr) * 2004-04-16 2010-01-06 Osram Sylvania Inc. Lampe inductive à haute fréquence avec interférences électromagnétiques réduites

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5539134A (en) * 1978-09-11 1980-03-18 Mitsubishi Electric Corp No-electrode fluorescent lamp device
EP0332263A1 (fr) * 1988-03-09 1989-09-13 Koninklijke Philips Electronics N.V. Lampe à décharge à basse pression sans électrodes

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5539134A (en) * 1978-09-11 1980-03-18 Mitsubishi Electric Corp No-electrode fluorescent lamp device
EP0332263A1 (fr) * 1988-03-09 1989-09-13 Koninklijke Philips Electronics N.V. Lampe à décharge à basse pression sans électrodes

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 4, no. 71 (E - 12) 24 May 1980 (1980-05-24) *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996013053A2 (fr) * 1994-10-19 1996-05-02 Philips Electronics N.V. Ensemble d'eclairage, lampe a decharge a basse pression depourvue d'electrodes et enceinte de decharge pour ensemble d'eclairage
WO1996013053A3 (fr) * 1994-10-19 1996-08-08 Philips Electronics Nv Ensemble d'eclairage, lampe a decharge a basse pression depourvue d'electrodes et enceinte de decharge pour ensemble d'eclairage
CN1089483C (zh) * 1994-10-19 2002-08-21 皇家菲利浦电子有限公司 照明单元、无电极低压放电灯,及用于照明单元的放电容器
US5866991A (en) * 1996-07-17 1999-02-02 General Electric Company Induction lamp with oppositely oriented coil winding layers
EP1587134A3 (fr) * 2004-04-16 2010-01-06 Osram Sylvania Inc. Lampe inductive à haute fréquence avec interférences électromagnétiques réduites

Also Published As

Publication number Publication date
EP0594245B1 (fr) 1997-09-17

Similar Documents

Publication Publication Date Title
US5465028A (en) Illumination unit, and electrodeless low-pressure discharge lamp and coil suitable for use therein
EP0332263B1 (fr) Lampe à décharge à basse pression sans électrodes
EP0162504B1 (fr) Lampe à décharge à basse pression sans électrode
US4568859A (en) Discharge lamp with interference shielding
EP0512622B1 (fr) Lampe à décharge dans la vapeur de mercure à basse pression sans électrodes
EP0198523B1 (fr) Lampe à décharge basse-pression sans électrode
EP0294004B1 (fr) Lampe de décharge à basse pression sans électrodes
US4645967A (en) Electrodeless low-pressure gas discharge lamp
JPH0782832B2 (ja) 無電極蛍光灯
US4728867A (en) Electrodeless low-pressure discharge lamp
US6051922A (en) Electrodeless low-pressure mercury vapour discharge lamp employing a high frequency magnetic field having a layer of aluminum oxide particles
EP0594245B1 (fr) Ensemble d'illumination et lampe à décharge basse pression sans électrode apte à l'utilisation dans cet ensemble
EP0594247B1 (fr) Ensemble d'illumination et lampe à décharge basse pression sans électrode apte à l'utilisation dans ce type d'ensemble d'illumination
US5811914A (en) Electrodeless low-pressure discharge lamp
EP0658922B1 (fr) Ensemble d'illumination, lampe à décharge basse pression sans électrode, support et unité d'alimenation adaptés à l'utilisation dans un tel ensemble d'illumination
EP0734585B1 (fr) Ensemble d'eclairage, lampe a decharge a basse pression depourvue d'electrodes et enceinte de decharge pour ensemble d'eclairage
CN103858206A (zh) 具有盘绕电线点火辅助设备的高强度放电灯
EP0674339A2 (fr) Lampe à décharge dans la vapeur de mercure à basse pression sans électrode

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): BE DE ES FR GB IT NL

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: N.V. PHILIPS' GLOEILAMPENFABRIEKEN

17P Request for examination filed

Effective date: 19941019

17Q First examination report despatched

Effective date: 19951214

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): BE DE ES FR GB IT NL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 19970917

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRE;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.SCRIBED TIME-LIMIT

Effective date: 19970917

Ref country code: BE

Effective date: 19970917

REF Corresponds to:

Ref document number: 69313970

Country of ref document: DE

Date of ref document: 19971023

ET Fr: translation filed
REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2109425

Country of ref document: ES

Kind code of ref document: T3

NLV1 Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

RAP4 Party data changed (patent owner data changed or rights of a patent transferred)

Owner name: KONINKLIJKE PHILIPS ELECTRONICS N.V.

26N No opposition filed
REG Reference to a national code

Ref country code: FR

Ref legal event code: CD

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: ES

Payment date: 19981016

Year of fee payment: 6

REG Reference to a national code

Ref country code: ES

Ref legal event code: PC2A

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19991014

REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

REG Reference to a national code

Ref country code: GB

Ref legal event code: 746

Effective date: 20020911

REG Reference to a national code

Ref country code: FR

Ref legal event code: D6

REG Reference to a national code

Ref country code: ES

Ref legal event code: FD2A

Effective date: 20001113

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20051027

Year of fee payment: 13

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20051213

Year of fee payment: 13

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20061030

Year of fee payment: 14

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20070501

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20070629

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20061031

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20071013

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20071013