EP1087422A2 - Lampe à décharge à gaz avec structure de couplage capacitif - Google Patents

Lampe à décharge à gaz avec structure de couplage capacitif Download PDF

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Publication number
EP1087422A2
EP1087422A2 EP00203244A EP00203244A EP1087422A2 EP 1087422 A2 EP1087422 A2 EP 1087422A2 EP 00203244 A EP00203244 A EP 00203244A EP 00203244 A EP00203244 A EP 00203244A EP 1087422 A2 EP1087422 A2 EP 1087422A2
Authority
EP
European Patent Office
Prior art keywords
gas discharge
electrode
discharge lamp
capacitive coupling
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.)
Withdrawn
Application number
EP00203244A
Other languages
German (de)
English (en)
Other versions
EP1087422A3 (fr
Inventor
Albrecht Dr. Kraus
Bernd Dr. 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
Philips Corporate Intellectual Property 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, Philips Corporate Intellectual Property GmbH, Koninklijke Philips Electronics NV filed Critical Philips Intellectual Property and Standards GmbH
Publication of EP1087422A2 publication Critical patent/EP1087422A2/fr
Publication of EP1087422A3 publication Critical patent/EP1087422A3/fr
Withdrawn legal-status Critical Current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
    • 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 a filling gas with a Filling gas pressure p filled gas discharge vessel and at least one capacitive coupling structure.
  • Known gas discharge lamps consist of a vacuum-tight vessel with a filling gas with a filling gas pressure p, in which the gas discharge takes place, and usually two metallic electrodes which are melted into the discharge vessel.
  • One electrode supplies the electrons for the discharge, which are fed back to the external circuit via the second electrode.
  • the electrons are mostly released by means of glow emission (hot electrodes), but can also be caused by emission in a strong electric field or directly by ion bombardment (ion-induced secondary emission) (cold electrodes).
  • a gas discharge lamp can also be operated without electrically conductive electrodes. In an inductive operating mode, the charge carriers are generated directly in the gas volume via an electromagnetic alternating field of high frequency (typically greater than 1 MHz in the case of low-pressure gas discharge lamps).
  • capacitive coupling structures are used as electrodes. These are formed from insulators (dielectrics) which have contact with the gas discharge on one side and which are electrically conductive (for example by means of a metallic contact) with an external circuit on the other side. With an alternating voltage applied to the capacitive coupling structures, an alternating electrical field is formed in the discharge vessel, on the linear electrical fields of which the charge carriers move. In the high-frequency range (> 10 MHz), capacitive lamps are similar to inductive lamps, since the charge carriers are also generated here in the entire gas volume.
  • the surface properties of the dielectric material of the coupling structures are of little importance here (so-called ⁇ -discharge mode).
  • ⁇ -discharge mode At lower frequencies, the capacitive lamps change their mode of operation and the electrons important for the discharge originally had to be emitted on the surface of the dielectric coupling structure and multiplied in a so-called cathode drop region in order to maintain the discharge.
  • the emission behavior of the dielectric material is therefore decisive for the function of the lamp (so-called ⁇ discharge mode).
  • ⁇ discharge mode a narrow plasma boundary layer forms near the dielectric surface, which resembles the cathode drop region of a DC glow discharge with cold metal cathodes.
  • a voltage U S drops across this boundary layer, which can be significantly more than 100 V depending on the current density.
  • the corresponding power U S ⁇ I represents a power loss for light generation, since no light generation takes place in the boundary layer in relation to the power converted.
  • I denotes the current in the lamp.
  • a capacitively coupled lamp in the ⁇ discharge mode therefore has a significantly reduced efficiency (lm / W).
  • Gas discharge lamps require a driver electronics to operate, the gas discharge ignites in the lamp and a ballast for the operation of the lamp on a circuit supplies. Without appropriate ballasting of the lamp in an external circuit would 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 destroys the lamp is coming.
  • Such gas discharge lamps are also from the American patent US 2,624,858 known.
  • a gas discharge lamp with capacitive electrodes is used a dielectric material with a high dielectric constant ⁇ > 100 (preferred ⁇ > 2000) operated at an operating frequency of less than 120 Hz.
  • the external tension must be between 500 V and 10000 V.
  • the gas discharge lamp is powered by a capacitive coupling fed over the dielectric material.
  • the dielectric material separates the metallic one Electrode and gas discharge. Due to the high specific capacitor properties of the dielectric material supplies a charge induced on the metallic electrode ionization and discharge of the filling gas in the lamp.
  • the ⁇ discharge mode also leads to the formation of a plasma boundary layer near this in this gas discharge lamp dielectric surface in which a large power loss at the expense of efficiency Lamp is implemented.
  • the object of the invention is to provide a gas discharge lamp with capacitive coupling to create with increased efficiency.
  • the object is achieved in that a and connected to the gas discharge vessel at least one cavity with a surface A and a volume V according to p ⁇ V / A ⁇ 10 cmTorr enclosing electrode made of a dielectric material for Formation of at least one capacitive coupling structure is provided.
  • the gas discharge lamp consists in a known manner of a transparent or for the desired Radiation-permeable discharge vessel with a usual filling gas (for example for Low pressure gas discharge lamps a rare gas or a rare gas with mercury) a filling gas pressure p.
  • the discharge vessel contains at least two spatially apart separate electrodes or coupling structures, at least one of which is capacitive Coupling structure is formed.
  • the capacitive coupling structure according to the invention can, for example, also be combined with a metallic electrode.
  • the capacitive Coupling structure is formed by an electrode made of a suitable dielectric material such as Glass, ceramics, polymers or mixtures thereof and for connection to an external voltage source with an electrically conductive Contact is provided.
  • the capacitive coupling structure can also consist of several layers different dielectric materials. This dielectric or capacitive
  • the electrode is shaped to have a cavity. The cavity is up on a connection to the gas discharge vessel is completed in a vacuum-tight manner. He owns on the Inside the electrode, a surface A and encloses a volume V, whereby up to Connection point to the gas discharge vessel is measured.
  • the filling gas pressure p in Torr is specified.
  • the coupling structure there are various configurations within the scope of protection the coupling structure conceivable, such as the use of several Electrodes arranged in parallel, which together form a dielectric electrode.
  • the electrode encloses at least one cavity with a volume V approximately equal to the volume of a plasma boundary layer which forms during operation of the gas charge lamp.
  • the volume of the cavity is dimensioned such that it approximately corresponds, in particular with a maximum deviation of 10%, to the volume that the plasma boundary layer occupies near the dielectric surface, a particularly large increase in the efficiency of the lamp is achieved.
  • the plasma boundary layer is formed on the inside of the dielectric electrode, a particularly advantageous dimensioning of the cavity can also be described by means of the diameter D.
  • the diameter D of the cavity corresponds to the diameter of the cylinder.
  • the plasma boundary layer has a thickness equal to the radius of the cylinder.
  • the exemplary embodiments of the gas discharge lamps all use a capacitive coupling structure with a dielectric electrode with a cavity (with a surface A and a volume V) according to p ⁇ V / A ⁇ 10 cm Torr (with filling gas pressure p of the filling gas in the gas discharge vessel).
  • the lamps are operated in the ⁇ discharge mode, ie typically at frequencies below 10 MHz.
  • 1 shows a gas discharge lamp 1 with a cylindrical gas discharge vessel 2 and two cylindrical capacitive coupling structures 3.
  • the two capacitive coupling structures 3 are each connected at one end to the gas discharge vessel 2 by means of a vacuum-tight connection 4.
  • an RF mains voltage source 5 is shown with leads 6 to the capacitive coupling structures 3.
  • the gas discharge lamp 1 is rotationally symmetrical about an axis 7.
  • the gas discharge vessel is filled with 5mbar Ar and 5mg Hg and has a phosphor coating on the inside so that the desired spectrum is emitted.
  • the RF mains voltage source 5 supplies an average voltage of 500 V at a frequency of 5 MHz.
  • FIG. 2 One of the cylindrical capacitive coupling structures 3 from FIG. 1 is shown in FIG. 2 presented in more detail. It consists of a cylindrical dielectric electrode 8 with a cavity and a cap 9 made of a disc made of a dielectric Material is made and the capacitive coupling structure 3 is vacuum-tight on one side completes.
  • On the a metallic layer is applied to the outer circumference of the dielectric electrode 8, which is used for contacting the leads 6.
  • the lamp 1 is switched on the capacitive coupling structure 3 ballasts, so that an additional external ballasting is not necessary.
  • a maximum average current of approximately 40mA i.e. achieved an average power of 20W.
  • the coupled power or the Operating frequency can be changed by changing the thickness of the glass tube 8 and thus the capacity of the dielectric coupling structure 3 can be varied, so that an adaptation to given requirements is possible.
  • the lamp 1 is in the ⁇ discharge mode operated, so that a plasma boundary layer is formed on the electrodes, which approximately the Cavity in the glass tube 8 occupies. The power loss in the plasma boundary layer is strong due to the shape of the dielectric electrodes 8 used with cavity reduced.
  • a non-conductive material other than glass is used as the dielectric for the electrode 8.
  • the operating condition of the lamp 1, in particular the operating frequency and the coupled power can be varied and adapted to requirements.
  • a dielectric material with a dielectric constant ⁇ 1000 eg BaTiO 3 , PZT, PLZT
  • a thickness of the tubular electrode 8 of 0.5 mm operating frequencies in the HF range (around 30 kHz) can be achieved. This enables the lamp 1 to be operated by means of simplified driver electronics.
  • FIG. 3 shows a second embodiment of the gas discharge lamp 1 with a curved gas discharge vessel 10 and cylindrical capacitive coupling structures 11 shown.
  • the coupling structures 11 are vacuum-tight on one side with the Gas discharge vessel 10 connected and sealed vacuum-tight on the other side. Via an electrical contact applied to the outside of the coupling structures 11 they are connected to the supply lines 6 of a mains voltage source 5.
  • the gas discharge vessel 10 consists of a U-shaped glass tube with an inner diameter of 9mm, the inside is phosphor-coated and filled with 5mbar Ar and 5mg Hg is.
  • the capacitive coupling structure 11 consists of several dielectric electrodes 8 arranged in parallel.
  • the tubular electrodes 8 are sealed on one side with a cap 9 in a vacuum-tight manner.
  • the cap 9 is again formed by a disk made of a dielectric material.
  • a vacuum-tight connection is established between the dielectric electrodes 8 and the gas discharge vessel 10 by means of a glass pane 12.
  • the glass pane 12 has openings; so that there is a connection between the cavities of the electrodes 8 and the gas discharge vessel 10.
  • the electrodes 8 consist of a dielectric material such as specially doped BaTiO 3 and are all electrically contacted from the outside by means of a metallic layer.
  • a coupling structure 11 made of a ferroelectric material with a high saturation polarization P and a coupling area A as large as possible is used in a lamp 1 according to the second embodiment.
  • the product P ⁇ A is the maximum load that can be transported per half cycle of the mains voltage source 5.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Discharge Lamp (AREA)
  • Discharge Lamps And Accessories Thereof (AREA)
EP00203244A 1999-09-24 2000-09-15 Lampe à décharge à gaz avec structure de couplage capacitif Withdrawn EP1087422A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19945758A DE19945758A1 (de) 1999-09-24 1999-09-24 Gasentladungslampe
DE19945758 1999-09-24

Publications (2)

Publication Number Publication Date
EP1087422A2 true EP1087422A2 (fr) 2001-03-28
EP1087422A3 EP1087422A3 (fr) 2003-11-05

Family

ID=7923134

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00203244A Withdrawn EP1087422A3 (fr) 1999-09-24 2000-09-15 Lampe à décharge à gaz avec structure de couplage capacitif

Country Status (6)

Country Link
US (1) US6507151B1 (fr)
EP (1) EP1087422A3 (fr)
JP (1) JP2001110363A (fr)
KR (1) KR100786401B1 (fr)
CN (1) CN1227712C (fr)
DE (1) DE19945758A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1137050A1 (fr) * 2000-03-24 2001-09-26 Philips Corporate Intellectual Property GmbH Structure de couplage capacitif pour lampe à décharge à basse pression
EP1263021A1 (fr) * 2001-06-01 2002-12-04 Philips Corporate Intellectual Property GmbH Affichage à cristaux liquides avec éclairage de fond amélioré
WO2004025692A1 (fr) * 2002-09-12 2004-03-25 Philips Intellectual Property & Standards Gmbh Lampe a decharge de gaz basse pression a substances emettrices d'electrons du type batio3

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002289138A (ja) * 2001-03-28 2002-10-04 Matsushita Electric Ind Co Ltd 冷陰極蛍光ランプ
DE10122392A1 (de) * 2001-05-09 2002-11-14 Philips Corp Intellectual Pty Gasentladungslampe
JP2005502171A (ja) * 2001-09-05 2005-01-20 コーニンクレッカ　フィリップス　エレクトロニクス　エヌ　ヴィ 低圧ガス放電ランプ
KR101150196B1 (ko) * 2005-03-14 2012-06-12 엘지디스플레이 주식회사 액정표시장치용 형광램프

Citations (5)

* 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
GB692998A (en) * 1949-01-31 1953-06-17 Gustav Leithaeuser Gas discharge lamp for recording acoustic vibrations
WO1999025001A1 (fr) * 1997-11-07 1999-05-20 Koninklijke Philips Electronics N.V. Unite d'eclairage et dispositif d'affichage a cristaux liquides
WO1999049493A1 (fr) * 1998-03-24 1999-09-30 Corning Incorporated Lampe a decharge excitee par des electrodes externes
EP1043757A1 (fr) * 1999-04-07 2000-10-11 Philips Corporate Intellectual Property GmbH Lampe à décharge gazeuse

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63160150A (ja) * 1986-12-23 1988-07-02 Matsushita Electric Works Ltd 照明装置
JPH0697607B2 (ja) * 1990-06-12 1994-11-30 松下電工株式会社 無電極放電ランプ
TW343348B (en) * 1996-12-04 1998-10-21 Philips Electronics Nv Metal halide lamp

Patent Citations (5)

* 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
GB692998A (en) * 1949-01-31 1953-06-17 Gustav Leithaeuser Gas discharge lamp for recording acoustic vibrations
WO1999025001A1 (fr) * 1997-11-07 1999-05-20 Koninklijke Philips Electronics N.V. Unite d'eclairage et dispositif d'affichage a cristaux liquides
WO1999049493A1 (fr) * 1998-03-24 1999-09-30 Corning Incorporated Lampe a decharge excitee par des electrodes externes
EP1043757A1 (fr) * 1999-04-07 2000-10-11 Philips Corporate Intellectual Property GmbH Lampe à décharge gazeuse

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1137050A1 (fr) * 2000-03-24 2001-09-26 Philips Corporate Intellectual Property GmbH Structure de couplage capacitif pour lampe à décharge à basse pression
EP1263021A1 (fr) * 2001-06-01 2002-12-04 Philips Corporate Intellectual Property GmbH Affichage à cristaux liquides avec éclairage de fond amélioré
WO2004025692A1 (fr) * 2002-09-12 2004-03-25 Philips Intellectual Property & Standards Gmbh Lampe a decharge de gaz basse pression a substances emettrices d'electrons du type batio3

Also Published As

Publication number Publication date
EP1087422A3 (fr) 2003-11-05
JP2001110363A (ja) 2001-04-20
KR20010039909A (ko) 2001-05-15
KR100786401B1 (ko) 2007-12-17
US6507151B1 (en) 2003-01-14
CN1227712C (zh) 2005-11-16
DE19945758A1 (de) 2001-03-29
CN1293448A (zh) 2001-05-02

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