EP1043757B1 - Gasentladungslampe - Google Patents

Gasentladungslampe Download PDF

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Publication number
EP1043757B1
EP1043757B1 EP00201148A EP00201148A EP1043757B1 EP 1043757 B1 EP1043757 B1 EP 1043757B1 EP 00201148 A EP00201148 A EP 00201148A EP 00201148 A EP00201148 A EP 00201148A EP 1043757 B1 EP1043757 B1 EP 1043757B1
Authority
EP
European Patent Office
Prior art keywords
dielectric
gas discharge
discharge lamp
lamp
electric contact
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
EP00201148A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1043757A1 (de
Inventor
Albrecht Kraus
Bernd Rausenberger
Horst Dannert
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 Intellectual Property and Standards GmbH
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 Intellectual Property and Standards GmbH, Koninklijke Philips Electronics NV filed Critical Philips Intellectual Property and Standards GmbH
Publication of EP1043757A1 publication Critical patent/EP1043757A1/de
Application granted granted Critical
Publication of EP1043757B1 publication Critical patent/EP1043757B1/de
Anticipated expiration legal-status Critical
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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
    • H01J65/046—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 capacitive means around the vessel

Definitions

  • the invention relates to a gas discharge lamp with at least one capacitive coupling-in structure.
  • Known gas discharge lamps consist of a vessel with a filling gas, in which the Gas discharge takes place, and usually two metallic electrodes, which are in the discharge vessel are melted down.
  • An electrode supplies the electrons for the discharge, which over the second electrode are fed back to the outer circuit.
  • the release of the electrons usually by means of annealing emission (hot electrodes), but can also by Emission in a strong electric field or directly by ion bombardment (ion-induced Secondary emission) (cold electrodes).
  • the charge carriers are directly in the gas volume via an electromagnetic High frequency alternating field (typically greater than 1 MHz for low pressure gas discharge lamps) generated. The electrons move on circular paths within the discharge vessel, conventional electrodes are missing in this mode.
  • capacitive coupling structures are used as electrodes. These are made of insulators (dielectrics), which on one side make contact with the gas discharge have and on the other hand electrically conductive (for example by means of a metallic Contact) are connected to an external circuit.
  • capacitive Electrode applied AC voltage forms an electric in the discharge vessel Alternating field on the linear electric fields, the charge carriers move.
  • the capacitive lamps are similar to the inductive one Lamps, as the charge carriers are also generated here in the entire gas volume.
  • the surface properties of the dielectric electrode are of little importance here (so-called ⁇ -discharge mode).
  • a disadvantage of the operation of known gas discharge lamps is a necessary driver electronics. This has the task to ignite the gas discharge of the lamp and a To supply ballast for the operation of the lamp on a circuit. Without a suitable Ballasting the lamp in an external circuit would reduce the current in the gas discharge lamp by increasing the charge carriers in the gas volume of the discharge vessel rise so high that it quickly comes to a destruction of the lamp.
  • Such gas discharge lamps are also known from the American patent specification US 2,624,858.
  • a gas discharge lamp with capacitive electrodes is by means of a dielectric material with a high dielectric constant ⁇ > 100 (preferred ⁇ > 2000) at an operating frequency of less than 120 Hz.
  • the external tension must be between 500 V and 10000 V. Therefore, such a capacitive Gas discharge lamp not mains operated for private households with 230 V and 50 Hz but is a circuit with a driver electronics necessary.
  • the object of the invention is therefore to provide a gas discharge lamp with at least one to provide capacitive coupling structure having improved operating characteristics.
  • the gas discharge lamp consists in a known manner of a transparent discharge vessel with a conventional filling gas (for example, for low-pressure gas discharge lamps, a noble gas or a noble gas with mercury).
  • the discharge vessel contains at least two spatially separate electrodes or coupling structures, of which at least one is designed as a capacitive coupling structure.
  • the capacitive coupling structure according to the invention can also be combined, for example, with a metallic electrode.
  • the dielectric of the capacitive coupling-in structure can consist of one or more layers.
  • Such a lamp can in particular without a circuit with a driver electronics on Power grid for households (e.g., 230V / 50Hz).
  • a driver electronics on Power grid for households e.g., 230V / 50Hz.
  • Preferred embodiments the gas discharge lamp are the further claims and the description remove.
  • All embodiments use as dielectric base material a dielectric solid having the properties according to the invention.
  • the material used for the dielectric of the capacitive coupling structures is preferably Ba (Ti 0.9 Zr 0.1 ) O 3 , which is acceptor-doped with a small amount of Mn.
  • the coercive force is E C ⁇ 60 V / mm.
  • a product of saturation polarization P and effective surface A with P ⁇ A> 10 -5 C and a product of coercive force E c and effective thickness of the dielectric d of E c ⁇ d ⁇ 200 V is achieved.
  • the gas discharge lamps can thus be operated without additional driver electronics directly on the network for private households.
  • the choice of the dielectric material is not limited to the above-mentioned material. It is equally possible to use all other dielectric materials, preferably paraelectrics, ferro- and antiferroelectrics, whose product of saturation polarization P and effective surface A satisfies the condition PA> 10 -5 C.
  • the material for the dielectric must easily be electrons on the plasma-facing surface submit.
  • To characterize the emission properties of the dielectric serves the ratio between ion current and electron current at the surface of the plasma facing side of the dielectric. This ratio is called ion-induced Secondary emission coefficient ⁇ denoted.
  • ⁇ advantageously be greater than 0.001, otherwise the plasma is not ignites.
  • the in the plasma boundary layer Delivered power can take high values and significantly reduces the efficiency (lumens per watt) of the lamp.
  • a high secondary emission coefficient ⁇ This leads to a reduction in this proportion of power and to increase the efficiency of the lamp. Therefore, such materials are particularly suitable for the dielectric in which during operation of the lamp additional electrons at the plasma facing Surface deposit, and lead to a secondary emission coefficient ⁇ > 0.01.
  • the cathode trap area imparts the entire gas discharge lamp a positive U / I characteristic.
  • FIG. 1 shows a capacitive gas discharge lamp with a glass tube 1 serving as a gas discharge vessel.
  • the inside of the glass-coated glass tube 1 has an inner diameter of 50 mm and is filled with 5 mbar Ar and 5 mg Hg.
  • a dielectric capacitive coupling structure consisting of a disc-shaped dielectric layer 2 and an electrically conductive layer 3 attached.
  • the dielectric layer 2 is formed by a disk having a diameter of 5 cm and a thickness of 0.5 mm, which consists of Ba (Ti 0.9 Zr 0.1 ) O 3 doped with a small amount of Mn acceptor is.
  • the dielectric disc 2 is attached to the gas discharge vessel 1 by means of a soldering process, so that a vacuum-tight connection is formed.
  • the electrically conductive layer 3 is realized by applying a silver paste, so that an electrical contact for connection to an external power grid 4 is available.
  • an external power grid 4 is used in this embodiment, the network for households with 230 V and 50 Hz.
  • the charging of the dielectric (2) during operation of the lamp leads to an electric field between the dielectric coupling structures (2), which results in a simplified re-ignition in the next half-phase of the AC supply (after current reversal) and an increase of the ion-induced secondary emission coefficient ⁇ .
  • the cathode fall region (dark zone in the vicinity of the coupling structure in which no light is generated) is reduced, thereby increasing the efficiency of the gas discharge lamp.
  • FIG. 2 shows a lamp with a glass tube 5 as a gas discharge vessel, which has a smaller inner diameter.
  • the inner diameter is only 9 mm with a filling of the inner phosphor-coated glass tube 5 with 15 mbar Ar and 5 mg Hg.
  • a respective dielectric coupling structure consisting of a disc-shaped dielectric layer 2 and an electrically conductive layer 3 attached.
  • the dielectric layer 2 is also formed here by a disk with a diameter of 5 cm and a thickness of 0.5 mm from Ba (Ti 0.9 Zr 0.1 ) O 3 , which is acceptor-doped with a small amount of Mn ,
  • the dielectric sheet 2 is vacuum-sealed to the glass tube 5 using a glass soldering technique.
  • the electrically conductive layer 3 is realized by applying a silver paste, so that an electrical contact for connection to an external power grid 4 is available.
  • an external power grid 4 is to be used in this embodiment, the network for households with 230 V and 50 Hz.
  • This embodiment of the lamp offers an increased efficiency because of the smaller inner diameter, since in this case the positive column of the gas discharge and the electrode and cathode drop regions can each be optimized separately.
  • the embodiment of the lamp illustrated in FIG. 3 has a discharge vessel, which consists of a curved glass tube 6.
  • the inside phosphor-coated glass tube 6 has an inner diameter of 9 mm and is filled with 15 mbar Ar and 5 mg Hg.
  • the dielectric coupling structure at both ends is in each case formed by a cylindrical tube 7 made of the dielectric material (especially doped BaTiO 3 ).
  • the dielectric cylinder 7 has an outer diameter of 10 mm with a wall thickness of 0.5 mm and a length of 60 mm.
  • the glass tube 6 is closed by a disc-shaped, dielectric cap 8 by means of a soldering vacuum-tight with the glass tube. On the dielectric cylinder 7, a layer of conductive silver is applied, so that an electrical contact is possible.
  • the lamp is connected to an external power grid 4 (230 V, 50 Hz).
  • This gas discharge lamp also offers a very good lighting efficiency with a much more compact design and higher mechanical stability.
  • other embodiments of the gas discharge lamp according to the invention are conceivable, in particular in the design of the discharge vessel or the choice of the dielectric and electrically conductive materials used for the coupling structures (eg to meet certain requirements for the shape of the lamp or production specifications).
  • the invention is not limited to lamps whose electromagnetic radiation is limited to the visible spectral range.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Discharge Lamps And Accessories Thereof (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Discharge Lamp (AREA)
EP00201148A 1999-04-07 2000-03-28 Gasentladungslampe Expired - Lifetime EP1043757B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19915617 1999-04-07
DE19915617A DE19915617A1 (de) 1999-04-07 1999-04-07 Gasentladungslampe

Publications (2)

Publication Number Publication Date
EP1043757A1 EP1043757A1 (de) 2000-10-11
EP1043757B1 true EP1043757B1 (de) 2005-10-05

Family

ID=7903741

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00201148A Expired - Lifetime EP1043757B1 (de) 1999-04-07 2000-03-28 Gasentladungslampe

Country Status (5)

Country Link
US (1) US6465955B1 (zh)
EP (1) EP1043757B1 (zh)
JP (1) JP2000311660A (zh)
CN (1) CN1214442C (zh)
DE (2) DE19915617A1 (zh)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19945758A1 (de) * 1999-09-24 2001-03-29 Philips Corp Intellectual Pty Gasentladungslampe
DE10122392A1 (de) * 2001-05-09 2002-11-14 Philips Corp Intellectual Pty Gasentladungslampe
WO2003015127A1 (en) 2001-08-06 2003-02-20 Koninklijke Philips Electronics N.V. Low-pressure gas discharge lamps
EP1430510A2 (en) * 2001-09-05 2004-06-23 Koninklijke Philips Electronics N.V. Low-pressure gas discharge lamp
KR100498307B1 (ko) * 2002-10-24 2005-07-01 엘지전자 주식회사 무전극 조명 시스템의 재발광 촉진 장치
JP2005216647A (ja) * 2004-01-29 2005-08-11 Ushio Inc 高放射輝度閃光放電ランプ
KR101123454B1 (ko) * 2004-12-24 2012-03-26 엘지디스플레이 주식회사 형광램프, 그 제조 방법 및 이를 구비한 백라이트 유닛
EP1875487A2 (en) * 2005-03-30 2008-01-09 Koninklijke Philips Electronics N.V. Discharge lamp and backlight unit for backlighting a display device comprising such a discharge lamp
KR101183418B1 (ko) * 2005-12-30 2012-09-14 엘지디스플레이 주식회사 외부 전극 형광램프 및 이를 이용한 액정표시장치의백라이트 유닛
NL2004872A (en) * 2009-06-18 2010-12-20 Asml Netherlands Bv Lithographic projection apparatus.

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2624858A (en) * 1948-11-15 1953-01-06 William B Greenlee Gaseous discharge lamp
US5013966A (en) * 1988-02-17 1991-05-07 Mitsubishi Denki Kabushiki Kaisha Discharge lamp with external electrodes
WO1996014654A1 (en) * 1994-11-08 1996-05-17 Philips Electronics N.V. Low-pressure discharge lamp
US5720859A (en) * 1996-06-03 1998-02-24 Raychem Corporation Method of forming an electrode on a substrate
JPH1140462A (ja) * 1997-07-22 1999-02-12 Tdk Corp Ｃｒ複合電子部品とその製造方法およびインダクタ
US6191539B1 (en) * 1999-03-26 2001-02-20 Korry Electronics Co Fluorescent lamp with integral conductive traces for extending low-end luminance and heating the lamp tube

Also Published As

Publication number Publication date
JP2000311660A (ja) 2000-11-07
DE19915617A1 (de) 2000-10-12
DE50011273D1 (de) 2005-11-10
US6465955B1 (en) 2002-10-15
CN1214442C (zh) 2005-08-10
EP1043757A1 (de) 2000-10-11
CN1274943A (zh) 2000-11-29

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