EP0348979A2 - Leuchtstofflampe - Google Patents

Leuchtstofflampe Download PDF

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Publication number
EP0348979A2
EP0348979A2 EP89111876A EP89111876A EP0348979A2 EP 0348979 A2 EP0348979 A2 EP 0348979A2 EP 89111876 A EP89111876 A EP 89111876A EP 89111876 A EP89111876 A EP 89111876A EP 0348979 A2 EP0348979 A2 EP 0348979A2
Authority
EP
European Patent Office
Prior art keywords
tube
lamp
fluorescent lamp
insulating layer
discharge
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Withdrawn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
EP89111876A
Other languages
English (en)
French (fr)
Other versions
EP0348979A3 (de
Inventor
Akihiro Inoue
Shinichi Tsunekawa
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.)
Toshiba Lighting and Technology Corp
Original Assignee
Toshiba Lighting and Technology Corp
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 Toshiba Lighting and Technology Corp filed Critical Toshiba Lighting and Technology Corp
Publication of EP0348979A2 publication Critical patent/EP0348979A2/de
Publication of EP0348979A3 publication Critical patent/EP0348979A3/de
Withdrawn legal-status Critical Current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
    • H01J61/35—Vessels; Containers provided with coatings on the walls thereof; Selection of materials for the coatings

Definitions

  • the present invention relates to a fluorescent lamp apparatus and, in particular, an apparatus including a fluorescent lamp which is operated with a high-frequency electric power.
  • a fluorescent lamp includes a discharge tube having having an elongated discharge space filled with a discharge gas conducive to light emission, electrodes sealed one at each end of the discharge tube and having a phosphor material coated on the inner surface of the tube.
  • the two types of such lamps may be listed: a low-pressure mercury lamp using a starting rare gas, such as argon, and mercury for a discharge gas and a rare gas discharge lamp containing, for example, a neon gas primarily consisting of a xenon gas.
  • Such lamps are employed not only for an ordinary illumination purpose but also for a back light for a liquid crystal display unit or for a light source for a facsimile machine or for a scanning light source for a copying machine.
  • the conventional lamp bulb for the back light and scanning light source was about 12 mm in inner diameter or over.
  • a recent tendency is for the liquid crystal display unit, facsimile machine and copying machine to become more and more compact and increasingly thinner. This requires a compact and thinner lamp for a light source and hence smaller and thinner associated lighting circuit components.
  • lamps are so designed as to reduce the diameter of the discharge tube or to make themselves elliptical or somewhat flattened elliptical in cross-section.
  • a high-frequency lighting system using, for example, a transistor inverter circuit has increasingly been adapted in place of the larger conventional lamps of a choke ballast type involving greater heat dissipation.
  • the structure of the apparatus has been designed to be made more and more compact by reducing a lamp storage space and mounting the bulb in close proximity to the wall surface of a lamp storage of the apparatus.
  • the lumen maintenance factor is lowered, sometimes failing to maintain the luminous flux in better conditions until a rated service life of the lamp is ended.
  • blackening occurs sometimes on the whole inner wall of the bulb during a portion of a lamp life, reducing the luminous flux. If the lamp is mounted on the wall of an apparatus of an electroconductive metal, blackening also occurs on the bulb wall surface portion corresponding to that electroconductive metal wall and a light emitting substance is sometimes dissipated within the discharge space with a resultant lowering of the illumination.
  • a lamp voltage for maintaining a discharge level becomes a higher level and, for this reason, a potential gradient of (lamp voltage - voltage drop on electrode)/electrode-to-­electrode distance along the axial direction of the tube becomes greater.
  • the potential gradient is about 1 to 3 V/cm whereas, for a lamp of below 7 mm in diameter, the potential gradient is over 5 V/cm.
  • a conductor is situated in proximity to the exterior of the lamp, it acts as a proximity conductor, creating an electric field across the bulb and that conductor. Under the influence of the electric field, the ions of the mercury which is filled within the discharge space are drawn toward, and intrudes into, the bulb wall to develop blackening. In the case of a xenon gas, ionized xenon is drawn by an electric field toward the bulb wall and hence intrudes into the wall where it is dissipated.
  • the blackening of the gas and dissipation of the xenon gas cause a decline in the lumen maintenance factor.
  • a fluorescent lamp apparatus comprising: a fluorescent lamp including a discharge tube filled with a discharge gas, a pair of electrodes provided within said tube and a phosphor layer coated on the inner surface of said tube; and means for applying a high-frequency electric power to said lamp, characterized in that said fluorescent lamp includes an electrically insulating layer formed between an inner surface of said tube and the phosphor layer to allow light to be passed and said means for applying a high-frequency electric power is adopted to operate said lamp at a potential gradient set over 5 V/cm.
  • a light-transmitting insulating layer is provided between the phosphor layer and the inner surface of the tube to prevent a passage of a leakage current through the insulating layer and hence to prevent the mercury or xenon which are filled within the discharge space from intruding as ions into the bulb wall. It is thus possible to prevent blackening of the tube and dissipation of the xenon.
  • a fluorescent lamp apparatus comprising: a fluorescent lamp including a discharge tube filled with a discharge gas, an electrode provided within said tube, a phosphor layer coated on an inner surface of said tube; and a proximity electroconductive member provided near an outer surface of said tube; and means for applying a high-frequency electric power to said lamp to operate said lamp, characterized in that the fluorescent lamp includes an electrically insulating layer formed on a surface of said tube to allow light to pass.
  • a light-transmitting insulating layer is formed on the outer or the inner surface of the tube, even if an electric field is generated between the tube and a conductor member situated in proximity to the exterior of the tube, the gas which is filled within the discharge space is electrically shielded by that insulating layer against the electric field. It is thus possible to prevent the mercury or xenon ions from intruding into the wall and hence to prevent blackening of the tube and dissipation of the xenon gas.
  • Fig. 1 shows an illumination apparatus used as a back light of a liquid crystal display apparatus, noting that the liquid crystal display apparatus is not shown.
  • a casing 10 is made of synthetic resin, such as polycarbonate, mixed with a conductive material (not shown) of, for example, powdered aluminum, so as to prevent electrification and leakage of a high-frequency electromagnetic wave.
  • the casing 10 is formed of a shallow pan with an upper side opened.
  • a rib 11 which is triangular in cross-section is formed integral with a middle bottom of the casing 10.
  • the bottom, side and rib surfaces of the casing 10 provide a reflection surface 12 which has a white color or a film evaporated with, for example, aluminum, over the whole area.
  • Lamp support areas 13, 13, 13, 13 are formed two at each end wall of the casing 10 and have a trough configuration each.
  • a pair of high-frequency lighting type fluorescent lamps 15, 15 according to the present invention are supported each on the opposite pair of lamp support areas 13, 13.
  • the fluorescent lamp 15 is of such a straight line type as indicated by a cross-section in Figs. 2 and 3 and includes a discharge tube or a bulb 16.
  • the bulb 16 is constructed of a straight glass tube having one end and an other end with an axis defined therebetween.
  • the tube 16 has a discharge space 17 across both the ends thereof and an inner surface 18 facing the discharge space 17 and an outer surface 19 facing the outside.
  • a pair of electrodes 20, 20 are provided within the tube 16 such that each is provided at the corresponding end of the tube.
  • the electrodes 20, 20 are of a cold-cathode type in the embodiment of the present invention and comprise an electrode body 20a constructed of an arrow like nickel plate and a lead wire 20b connected to the electrode body 20a.
  • An axial distance defined between the tips of the arrow-like electrodes is denoted by L (cm).
  • a phosphor material 21 is coated on that inner surface 18 of the tube 16 which faces the discharge space 17.
  • the phosphor material 21 use is made of, for example, calcium halophosphate which is formed as a layer on the inner surface 18 of the tube 16.
  • a light-transmissive, electrically insulating layer 22 is formed between the inner surface 18 of the tube 16 and the phosphor layer 21.
  • the insulating layer 22 is formed of a light-transmissive metal oxide, such as alumina, silica, zirconia and cerium oxide.
  • a powered-alumina layer is employed according to the present invention.
  • the insulating layer 22 made of the alumina can be formed by preparing, for example, a suspension of powdered alumina and nitro-cotton in butyl acetate, coating the suspension on the inner surface 18 of tube 16 and sintering the coated film into ceramics.
  • an alumina layer can be formed on the inner surface 18 of the tube 16 by dipping a tube 16 into an organic alumina compound solution, such as an aluminum alcoxide solution, and lifting, drying and sintering it.
  • an organic alumina compound solution such as an aluminum alcoxide solution
  • a fluorescent lamp 15 according to the present invention includes a bulb of a substantially circular cross-section having an outer diameter d1 of 6.5 mm and inner diameter d2 of 5.0 mm in which case the whole length of the bulb is 270 mm and an electrode-to-electrode length L is set to be 250 mm.
  • the ends of the lamps 15, 15 are firmly fitted in the corresponding lamp support areas 13, 13, 13, 13 of the casing 10.
  • a light diffusion transmission plate 25 is attached to an upper open end of the casing 10, noting that the plate 25 is made of, for example, an acrylic resin.
  • the acrylic resin has a milky white color and a function of allowing light to be transmitted in a diffused fashion.
  • thickened portions 26, 26 are formed which face the lamps 15, 15, respectively.
  • the thickened portions 26, 26 extend along the axial direction of the lamps 15, 15 with their thickness gradually decreased away from a direction perpendicular to the axial direction of the lamps 15, 15.
  • a high-frequency electromagnetic wave preventing section 27 is provided on the upper surface of the transmission plate 25.
  • the section 27 is formed by evaporating aluminum on the upper surface of the transmission plate 25 in a mesh-like fashion and prevents an external leakage of a high-frequency electromagnetic wave because it is made up of an aluminum conductor.
  • the fluorescent lamps 15, 15 are connected respectively through ballast elements 31,31 to a high frequency transistor inverter circuit 30 and lit via this circuit.
  • the high-frequency transistor inverter 30 is connected to a power source 32.
  • the lighting frequency is 50 KHz in the embodiment of the present invention.
  • the fluorescent lamp apparatus thus constructed will be explained below.
  • the transmission plate 25 increases in its amount of light transmission as the thickness of the plate 25 is decreased in a direction away from a top plane just over the lamps 15,15.
  • the transmission plate 25 per se serves to eliminate a luminance variation.
  • the luminance distribution of light which is emitted via the transmission plate 25 provides uniform brightness over the whole surface of the transmission plate 25.
  • the casing 10 contains powdered aluminum and the mesh-like leakage preventing section 27 is formed on the top surface of the transmission plate 25. For this reason, even if the fluorescent lamps 15, 15 are lit with a high-frequency wave within the casing 10, an external leakage of the high-frequency electromagnetic wave is prevented.
  • the luminous intensity of the lamps 15,15 maintains a value of over 50% relative to an initial luminous intensity and that a high lumen maintenance factor is ensured due to less blackening on the wall of the bulb.
  • blackening is started about several tens of hours after the lighting of the lamp and the luminance intensity is lawed to 50% of its starting level after a lapse of about 300 hours.
  • the insulating layer 22 prevents the electric conduction of a glass tube 16, that is, passage of a leakage current. This prevents the ions of the mercury which is filled within the discharge space 17 from entering the bulb wall and prevents blackening on the bulb wall. It is thus possible to improve the lumen maintenance factor and to extend the lamp life.
  • the fluorescent lamp 15 not having such a light-transmissive, insulating layer 22 as in the present embodiment is lit with a commercial power supply of 50 Hz and choke ballast, no blackening is observed even about 3000 hours after the lighting of the lamp. This will be probably because, although the intensity of an electric field in the discharge space 17 of the bulb 16 is substantially the same as in the high-frequency lighting type lamp of the present invention, the leakage current is decreased to an extremely small extent due to the lower frequency involved.
  • the present invention can effectively be applied to the fluorescent lamp to which high-frequency power is supplied from a high-frequency generator.
  • the presence of the insulating layer 22 between the inner surface 18 of the tube 16 and the phosphor layer 21 prevents blackening from occurring on the bulb wall, ensuring an improved lumen maintenance factor and a prolonged lamp life.
  • the second embodiment is different from the first embodiment of the present invention in that a fluorescent lamp 15 is of a U-bent type, that a stripe-type leakage preventing section 28 is formed on a light diffusion type transmission plate 25 to prevent a leakage of a high-frequency electromagnetic wave, and that a starting proximity conductor 40 is attached to the undersurface of an external surface 19 of a tube 16 so as to ensure a better startability.
  • the aforementioned U-bent type fluorescent lamp 15 is enclosed within a casing 10 similar to that of the first embodiment, and the aforementioned transmission plate 25 is provided at the upper open end of the casing 10.
  • the leakage preventing section 28 which is provided on the transmission plate 25 is comprised of a stripe-like aluminum-deposited section on the undersurface of the transmission plate 25. That stripe pattern is of such a type that the pitch is dense just over the lamp 15 and gradually coarser in a direction away from the lamp 15.
  • a starting proximity conductor 40 is attached to the undersurface of an outer surface 19 of the U-shaped bulb 16 along the axial direction of the lamp 15.
  • the proximity conductor 40 is an aluminum tape about 2 mm in width which is attached to the bulb along the axial direction of the bulb 16 with one end of the tape connected to one electrode 20 to obtain the same polarity as that electrode.
  • the lamp 15 of this embodiment has a light transmission insulating layer 22 formed between the inner surface 18 of a tube of the fluorescent lamp and a phosphor layer 21.
  • the tube of the fluorescent lamp 15 has an inner diameter of 6.5 mm, a lamp current of 15 mA and a potential gradient is 6 V/cm at a peak level.
  • the fluorescent lamp 15 was connected to the same high-frequency transistor inverter circuit 30 as that of Fig. 4 and lit when a high-frequency wave of 42 KHz is applied from the high-frequency transistor inverter circuit 30.
  • the lamp of the present invention including the light transmission insulating layer 22
  • blackening on the bulb wall was not observed 8000 hours after the lighting of the lamp.
  • the light transmission insulating layer 22 allows no electric field to be created between the outer surface 19 of the tube 16 on one hand and the electric conductors, for example, the proximity conductor 40 and leakage preventing section 28 on the other hand to prevent the mercury ions from being drawn toward the bulb wall and hence to prevent the occurrence of blackening.
  • the starting proximity conductor 40 and leakage preventing section 28 are the conductors and since, due to the proximity of these conductors to the tube 16, an electric field is created between these conductors and the tube 16 to produce blackening, a potential gradient along the axis of the tube is not restricted in this case to over 5 V/cm.
  • the third embodiment is different from the second embodiment in that a light transmission insulating layer 22 is formed on an outer surface 19 of a tube 16.
  • the fluorescent lamp of the third embodiment is placed in the same casing 10 as that of the second embodiment.
  • the distance l between the outer surface 19 of the tube 16 and a reflection surface 12 of the casing 10 is set to be 5 mm.
  • This lamp 15 was connected to the same high frequency transistor inverter circuit 30 as in Fig. 4 and a high-frequency wave of 42 KHz was applied from the transistor inverter circuit 30 to the lamp to light the lamp at a lamp current of 15 mA.
  • the fourth embodiment of the present invention is different from the third embodiment in that a tube 50 of the lamp 15 is elliptical in cross-section and that a light transmission insulating layer 22 is formed between an inner surface 18 of the tube 50 and a phosphor material 21.
  • the elliptical type tube is 14 mm in an inner major diameter as indicated by a and 6 mm in an inner minor diameter as indicated by b in Fig. 8.
  • the fluorescent lamp (the fourth embodiment) 15 was placed within the same casing as that of the second embodiment of the present invention in which case a distance l between an outer surface 19 of the tube 50 and a casing 10 was set to be 5 mm.
  • Fig. 9 shows a fluorescent lamp according to a fifth embodiment of the present invention.
  • a somewhat flattened tube 51 elliptical in cross-section may be employed in place of the aforementioned elliptical tube of Fig. 8.
  • an internal electrode 60 is provided only at one end of a tube 16 of a fluorescent lamp 15 and an external electrode 61 formed of a metal paste is provided on the outer surface of the tube 16 along the axis of the tube 16.
  • the fluorescent lamp having a tube (16) 4 mm in inner diameter and a length of 100 mm was lit at a lamp current 5 mA with a high frequency.
  • the blackening of the bulb promptly occurs when the lamp is lit at a potential gradient of over 5 V/cm with a high frequency and that, in order to prevent blackening, it is effective to form the light transmission insulating layer 22 on the inner surface of the tube.
  • the discharge tube if being circular, elliptical or somewhat flattened elliptical in cross-section, may be used in the present invention. Since a lamp voltage is high for a tube of a circular cross-section whose inner diameter is below 7 mm and for a tube of an elliptical or a substantially flattened elliptical configuration whose minor diameter is below 7 mm, the present invention can particularly effectively be carried out.
  • the present invention can also be applied to a rare gas discharge type fluorescent lamp of such a type that no mercury is filled within a tube.
  • a rare gas discharge type fluorescent lamp of such a type that no mercury is filled within a tube.
  • no blackening takes place due to the absence of any mercury and hence to no migration of mercury ions into the wall of the bulb.
  • xenon ions are migrated into the wall of the bulb and dissipated there, causing a decrease in the flux of light and hence degrading an expectant life characteristic. In order to prevent this, it is effective to provide a light transmission insulating layer.
  • the fluorescent lamp of the present invention may be not only of a cold cathode type but also of a hot cathode type.

Landscapes

  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Discharge Lamps And Accessories Thereof (AREA)
EP19890111876 1988-06-30 1989-06-29 Leuchtstofflampe Withdrawn EP0348979A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP160774/88 1988-06-30
JP63160774A JPH0212751A (ja) 1988-06-30 1988-06-30 高周波点灯式けい光ランプ

Publications (2)

Publication Number Publication Date
EP0348979A2 true EP0348979A2 (de) 1990-01-03
EP0348979A3 EP0348979A3 (de) 1990-11-28

Family

ID=15722164

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890111876 Withdrawn EP0348979A3 (de) 1988-06-30 1989-06-29 Leuchtstofflampe

Country Status (3)

Country Link
EP (1) EP0348979A3 (de)
JP (1) JPH0212751A (de)
KR (1) KR910010106B1 (de)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0466138A1 (de) * 1990-07-12 1992-01-15 Toshiba Lighting & Technology Corporation Entladungslampe mit Kaltkathode
EP0518132A2 (de) * 1991-05-31 1992-12-16 Mitsubishi Denki Kabushiki Kaisha Entladungslampe, Verfahren zu deren Herstellung sowie Bildwiedergabeanordnung mit der Entladungslampe
EP0794555A2 (de) * 1996-03-05 1997-09-10 Toshiba Lighting & Technology Corporation Kreisförmige Fluoreszenzlampe und Leuchter
WO1999057749A2 (en) * 1998-05-06 1999-11-11 Gl Displays, Inc. Cold cathode fluorescent lamp and display
WO2000017910A1 (de) * 1998-09-22 2000-03-30 Patent-Treuhand-Gesellschaft Für Elektrische Glüh Lampen Mbh Entladungslampe mit dielektrisch behinderten elektroden
US6201352B1 (en) 1995-09-22 2001-03-13 Gl Displays, Inc. Cold cathode fluorescent display
WO2001020642A1 (en) * 1999-09-11 2001-03-22 Gl Displays, Inc. Gas discharge fluorescent device
US6211612B1 (en) 1995-09-22 2001-04-03 Gl Displays, Inc. Cold cathode fluorescent display
US6316872B1 (en) 1995-09-22 2001-11-13 Gl Displays, Inc. Cold cathode fluorescent lamp
US6515433B1 (en) 1999-09-11 2003-02-04 Coollite International Holding Limited Gas discharge fluorescent device
FR2882489A1 (fr) * 2005-02-22 2006-08-25 Saint Gobain Structure lumineuse plane ou sensiblement plane
FR2905032A1 (fr) * 2006-08-21 2008-02-22 Saint Gobain Structure lumineuse et/ou uv sensiblement plane
CN100403112C (zh) * 2004-01-14 2008-07-16 夏普株式会社 显示装置用照明装置
US8217220B2 (en) 2005-10-05 2012-07-10 Sca Hygiene Products Ab Absorbent article comprising a thin film including an active agent

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2923388B2 (ja) * 1992-04-03 1999-07-26 松下電工株式会社 表示素子用螢光ランプ

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3067356A (en) * 1960-04-06 1962-12-04 Sylvania Electric Prod Fluorescent lamp
EP0249743A2 (de) * 1986-06-16 1987-12-23 GTE Laboratories Incorporated Entladungslampen mit beschichteten keramischen Bogenkolben und ihre Fabrikation
EP0270004A2 (de) * 1986-12-01 1988-06-08 Kabushiki Kaisha Toshiba Gasentladungslampe und diese Lampe benutzendes Gerät

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3067356A (en) * 1960-04-06 1962-12-04 Sylvania Electric Prod Fluorescent lamp
EP0249743A2 (de) * 1986-06-16 1987-12-23 GTE Laboratories Incorporated Entladungslampen mit beschichteten keramischen Bogenkolben und ihre Fabrikation
EP0270004A2 (de) * 1986-12-01 1988-06-08 Kabushiki Kaisha Toshiba Gasentladungslampe und diese Lampe benutzendes Gerät

Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0466138A1 (de) * 1990-07-12 1992-01-15 Toshiba Lighting & Technology Corporation Entladungslampe mit Kaltkathode
EP0518132A2 (de) * 1991-05-31 1992-12-16 Mitsubishi Denki Kabushiki Kaisha Entladungslampe, Verfahren zu deren Herstellung sowie Bildwiedergabeanordnung mit der Entladungslampe
EP0518132A3 (de) * 1991-05-31 1994-03-09 Mitsubishi Electric Corp
US5514934A (en) * 1991-05-31 1996-05-07 Mitsubishi Denki Kabushiki Kaisha Discharge lamp, image display device using the same and discharge lamp producing method
US6201352B1 (en) 1995-09-22 2001-03-13 Gl Displays, Inc. Cold cathode fluorescent display
US7474044B2 (en) 1995-09-22 2009-01-06 Transmarine Enterprises Limited Cold cathode fluorescent display
US6316872B1 (en) 1995-09-22 2001-11-13 Gl Displays, Inc. Cold cathode fluorescent lamp
US6211612B1 (en) 1995-09-22 2001-04-03 Gl Displays, Inc. Cold cathode fluorescent display
US7919915B2 (en) 1995-09-22 2011-04-05 Transmarine Enterprises Limited Cold cathode fluorescent display
EP0794555A2 (de) * 1996-03-05 1997-09-10 Toshiba Lighting & Technology Corporation Kreisförmige Fluoreszenzlampe und Leuchter
US5796210A (en) * 1996-03-05 1998-08-18 Toshiba Lighting & Technology Corporation Circular fluorescent lamp unit and lighting apparatus
EP0794555A3 (de) * 1996-03-05 1997-12-10 Toshiba Lighting & Technology Corporation Kreisförmige Fluoreszenzlampe und Leuchter
WO1999057749A3 (en) * 1998-05-06 2000-11-30 Gl Displays Inc Cold cathode fluorescent lamp and display
WO1999057749A2 (en) * 1998-05-06 1999-11-11 Gl Displays, Inc. Cold cathode fluorescent lamp and display
WO2000017910A1 (de) * 1998-09-22 2000-03-30 Patent-Treuhand-Gesellschaft Für Elektrische Glüh Lampen Mbh Entladungslampe mit dielektrisch behinderten elektroden
US6566810B1 (en) 1998-09-22 2003-05-20 Patent-Treuhand-Gesellschaft Fuer Elektrische Gluehlampen Mbh Discharge lamp with dielectrically inhibited electrodes
US6515433B1 (en) 1999-09-11 2003-02-04 Coollite International Holding Limited Gas discharge fluorescent device
WO2001020642A1 (en) * 1999-09-11 2001-03-22 Gl Displays, Inc. Gas discharge fluorescent device
CN100403112C (zh) * 2004-01-14 2008-07-16 夏普株式会社 显示装置用照明装置
US7461963B2 (en) 2004-01-14 2008-12-09 Sharp Kabushiki Kaisha Display device lighting unit
USRE44197E1 (en) 2004-01-14 2013-05-07 Sharp Kabushiki Kaisha Display device lighting unit
WO2006090086A2 (fr) * 2005-02-22 2006-08-31 Saint-Gobain Glass France Structure lumineuse plane ou sensiblement plane
WO2006090086A3 (fr) * 2005-02-22 2007-05-31 Saint Gobain Structure lumineuse plane ou sensiblement plane
FR2882489A1 (fr) * 2005-02-22 2006-08-25 Saint Gobain Structure lumineuse plane ou sensiblement plane
US8217220B2 (en) 2005-10-05 2012-07-10 Sca Hygiene Products Ab Absorbent article comprising a thin film including an active agent
FR2905032A1 (fr) * 2006-08-21 2008-02-22 Saint Gobain Structure lumineuse et/ou uv sensiblement plane
WO2008023124A1 (fr) * 2006-08-21 2008-02-28 Saint-Gobain Glass France Structure lumineuse et/ou uv sensiblement plane
US8120236B2 (en) 2006-08-21 2012-02-21 Saint-Gobain Glass France Light-emitting structure having leakage current limited by an electrical conductor with an adjustable frequency and an adjustable potential

Also Published As

Publication number Publication date
KR900000964A (ko) 1990-01-31
KR910010106B1 (ko) 1991-12-16
EP0348979A3 (de) 1990-11-28
JPH0212751A (ja) 1990-01-17

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