EP1422741A2 - Lampe à décharge à barrière dielectrique et son utilisation pour la visualisation d image radiographique - Google Patents

Lampe à décharge à barrière dielectrique et son utilisation pour la visualisation d image radiographique Download PDF

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Publication number
EP1422741A2
EP1422741A2 EP03025458A EP03025458A EP1422741A2 EP 1422741 A2 EP1422741 A2 EP 1422741A2 EP 03025458 A EP03025458 A EP 03025458A EP 03025458 A EP03025458 A EP 03025458A EP 1422741 A2 EP1422741 A2 EP 1422741A2
Authority
EP
European Patent Office
Prior art keywords
dielectric barrier
discharge lamp
barrier discharge
lamp
phosphor
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Withdrawn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
EP03025458A
Other languages
German (de)
English (en)
Other versions
EP1422741A3 (fr
Inventor
Udo Custodis
Renate Dr. Hirrle
Kunz Von Kriegelstein
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.)
Osram GmbH
Original Assignee
Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
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 Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH filed Critical Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
Publication of EP1422741A2 publication Critical patent/EP1422741A2/fr
Publication of EP1422741A3 publication Critical patent/EP1422741A3/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Withdrawn legal-status Critical Current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
    • H01J61/38—Devices for influencing the colour or wavelength of the light
    • H01J61/42—Devices for influencing the colour or wavelength of the light by transforming the wavelength of the light by luminescence
    • H01J61/44—Devices characterised by the luminescent material

Definitions

  • the invention is based on a dielectric barrier discharge lamp with a fluorescent layer.
  • dielectric barrier discharge lamp encompasses sources electromagnetic radiation based on dielectrically disabled Gas discharges.
  • a dielectric barrier discharge lamp sets at least a so-called dielectric barrier electrode ahead.
  • a dielectric disabled electrode is opposite the inside of the discharge vessel or separated from the discharge medium by means of a dielectric.
  • This Dielectric - the dielectric barrier - can, for example, act as the electrode covering dielectric layer, or is through the discharge vessel of the lamp itself is formed, namely when the electrode is arranged on the outside of the wall of the discharge vessel.
  • Lamps that determine whether the electrodes are cathodes or anodes work i.e. for operation with unipolar voltage pulses, at least the anodes are dielectrically separated from the discharge medium (see EP 0 733 266 B1).
  • the ionizable discharge medium usually consists of a noble gas, for example xenon or a gas mixture. So-called excimers are formed during the gas discharge, which is preferably operated by means of a pulsed operating method described in EP 0 733 266 B1. Excimers are excited molecules, such as Xe 2 *, which emit electromagnetic radiation when they return to their normally unbound basic state. In the case of Xe 2 *, the maximum of the molecular band radiation is approximately 172 nm, in the area of VUV radiation.
  • the present invention relates to a variant in which additionally a phosphor layer to convert the VUV radiation into Radiation with longer wavelengths, especially visible radiation (Light) is provided.
  • a dielectric barrier discharge lamp with a phosphor layer for general lighting is known from EP 0 733 266 B1 already cited.
  • the phosphor layer consists of a three-band phosphor with the red phosphor component (R) gadolinium yttrium borate ((Gd, Y) BO 3 : Eu), the green phosphor component (G), lanthanum phosphate (LaPO 4 : (Ce, Tb)) and the blue phosphor component (B) barium magnesium aluminum aluminate (BaM ) 10 O 17 : Eu).
  • R red phosphor component
  • G gadolinium yttrium borate
  • Eu green phosphor component
  • LaPO 4 lanthanum phosphate
  • B blue phosphor component
  • BaM barium magnesium aluminum aluminate
  • US 6 034 470 shows a flat dielectric barrier discharge lamp, which is also provided with the aforementioned three-band phosphor. This Flat lamp is especially for the backlighting of liquid crystal screens intended.
  • EP 0 7 38 311 B1 describes a dielectric barrier discharge lamp for the general lighting with a fluorescent coating reveals which also includes the aforementioned RGB components.
  • the object of the present invention is the application possibilities of dielectric barrier discharge lamps.
  • the phosphor mixture always carries that in practice inaccuracies and tolerances that occur, e.g. the typically slightly different quantum efficiencies different Fluorescent batches due to small manufacturing fluctuations etc.
  • the dielectric barrier discharge lamp according to the invention filled with xenon, typically with a filling pressure in the range from 50 to 200 mbar, preferably between 100 and 150 mbar.
  • the dielectric barrier discharge produces xenon excimer band radiation with a maximum at about 172 nm, which is the Stimulates phosphors.
  • the quantum efficiency is the Phosphors for this exciting radiation to be considered to ensure the highest possible luminous efficiency.
  • Another aspect is that Maintenance of the fluorescent components with permanent excitation with them Radiation.
  • the lowest possible number for each phosphor component Decrease in the intensity of the converted radiation over the lifetime of dielectric barrier discharge lamps of typically at least Aimed for 20,000 hours to maintain a constant color locus to ensure the lifespan. This is especially true when looking at it of X-ray images is important to ensure good reproducibility ensure the visual impression when viewing the X-ray image, whereby the backlighting of the X-ray images with the dielectric according to the invention Barrier discharge lamp takes place.
  • dielectric used especially in mammography Barrier discharge lamp has a color temperature of 10,000 K or more.
  • the color temperature is preferably more than 20,000 K, particularly preferably more than 30,000 K, very particularly preferably more than 40,000 K.
  • X-ray films are currently used in general, their transmission maximum in the blue spectral range of light lies. If now for the backlighting of the developed X-ray films Light source is used, which mainly contains blue spectral components (high Color temperature), there is a correspondingly higher proportion of the lamp luminous flux available for transmitted light viewing.
  • the dielectric according to the invention is Barrier discharge lamp designed as a so-called flat lamp.
  • the invention is characterized Flat lamp by a high and above all on the essentially plane Radiation area extremely homogeneous luminance, which is practically glare-free Backlighting enabled. This will make a reliable diagnosis for the doctor is considerably relieved, in critical cases, especially in mammography, improved. Find details about the flat lamp according to the invention yourself in the embodiment.
  • the dielectric barrier discharge lamp according to the invention also be tubular.
  • the light from this lamp is usually in the narrow side a light guide plate, e.g. a plexiglass plate, coupled (so-called Edge Light technique).
  • the light from the lamp is then on a broadside of the The light guide plate is largely diffusely coupled and thus also serves as flat light source for backlighting.
  • This technique is known in principle and here only marginally of interest and should therefore not be explained in more detail here become.
  • the dielectric barrier discharge lamp according to the invention is also suitable for other areas of application for which a high color temperature is required or is at least desirable, e.g. for the backlighting of liquid crystal screens (LCD) for special applications, especially for monochrome LCD.
  • LCD liquid crystal screens
  • FIGS 1a, 1b is a schematic plan view and side view of a dielectric barrier discharge lamp 1 according to the invention schematically shown. It is a flat dielectric barrier discharge lamp for the backlighting of x-rays, in particular in mammography. Is only for performance reasons a lamp with relatively few electrode strips and consequently relatively less Lamp diagonal shown. This aspect is related below explained in more detail with FIG. From their basic mechanical and electrical structure corresponds to this flat lamp in any case essentially that lamp disclosed in the already cited US 6 034 470 is. The main difference is the phosphor layer. Before this in Details will first be given with reference to FIGS Structure of the lamp 1 according to the invention are outlined.
  • the flat lamp 1 consists of a flat discharge vessel with a rectangular one Base area and an electrode set, which is inside the discharge vessel is arranged.
  • the discharge vessel in turn consists of a Back plate 2, a front plate 3 and a frame 4, each made of glass manufactured.
  • Back plate 2 and front plate 3 are each with glass solder 5 with connected to the frame 4 in a gas-tight manner such that the interior of the discharge vessel is cuboid.
  • the inside of the discharge vessel is filled with xenon with a pressure of approx. 130 mbar.
  • the back plate 2 is larger than the front plate 3 such that the discharge vessel has a rotating one has a free-standing edge. On this edge there are two track-like ones Supply lines 6, 7 applied for the electrode set.
  • the inner surface of the front plate 3 is coated with a three-band phosphor mixture (not visible in the illustration), which converts the UV / VUV radiation generated by the discharge into visible light.
  • a three-band phosphor mixture (not visible in the illustration), which converts the UV / VUV radiation generated by the discharge into visible light.
  • These are the red phosphor component (Y, Gd) BO 3 : Eu (NP 360-03 from Nichia), the green phosphor component La-PO 4 : (Ce, Tb) (2213 CCSX from OSRAM Sylvania Inc.) , and the blue phosphor component BaMgAl 10 O 17 : Eu (NP 107-44 from Nichia) with the associated weight fractions 8%, 62% and 30%.
  • the electrode set consists of a conductor track-like one Structure with strip-like metallic cathodes 8 and anodes 9, 10, 11, which are arranged alternately and in parallel on the inner surface of the back plate 2 are.
  • the cathode strips 8 specifically have spatially preferred starting points for the individual discharges occurring in pulsed operation (see EP 0 733 266 B1 already cited), which is characterized by nose-like, The extensions 12 facing the respective adjacent anode strip are realized are.
  • Anodes 10, 11 have the other anodes 9 a double structure 9a, 9b on. All anodes 9-11 are with a dielectric layer made of glass solder (not shown) covered.
  • the anodes 9-11 and cathodes 8 are each on one end extended and on the back plate 2 from the inside of the Discharge vessel led outwards on both sides such that the associated anodic or cathodic bushings on opposite to each other Sides of the back plate 2 are arranged.
  • the electrode strips 8-11 each go into those already mentioned 6 on the cathode side or 7 on the anode side.
  • the supply lines 6, 7 serve as contacts for connection to preferably an electrical one Pulse voltage source 13.
  • an electrical one Pulse voltage source 13 For a flat lamp (not shown) with e.g. 15 "diagonal is a (not shown) electrode set with twelve cathode strips and eleven double anode strips and two outer ones Single anodes provided. Each anode strip points along each of the Thirteen extensions on each of the long sides for igniting the individual discharges on.
  • the invention is based on the example of a flat dielectric Barrier discharge lamp has been explained in detail, it is not on this Lamp shape limited. Rather, their beneficial effects arise also for lamps with other tube shapes, e.g. for tubular lamps.
  • the electrode set consists of two or more elongated ones Electrodes parallel to the lamp's longitudinal axis on the wall of the tubular Discharge vessel are arranged.

Landscapes

  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Luminescent Compositions (AREA)
EP03025458A 2002-11-20 2003-11-05 Lampe à décharge à barrière dielectrique et son utilisation pour la visualisation d image radiographique Withdrawn EP1422741A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10254208 2002-11-20
DE10254208A DE10254208A1 (de) 2002-11-20 2002-11-20 Dielektrische Barriere-Entladungslampe und Verwendung dieser Lampe für die Röntgenbildbetrachtung

Publications (2)

Publication Number Publication Date
EP1422741A2 true EP1422741A2 (fr) 2004-05-26
EP1422741A3 EP1422741A3 (fr) 2005-03-02

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP03025458A Withdrawn EP1422741A3 (fr) 2002-11-20 2003-11-05 Lampe à décharge à barrière dielectrique et son utilisation pour la visualisation d image radiographique

Country Status (4)

Country Link
US (1) US20040100182A1 (fr)
EP (1) EP1422741A3 (fr)
CA (1) CA2451289A1 (fr)
DE (1) DE10254208A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004006614A1 (de) * 2004-02-10 2005-08-25 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Beleuchtungsvorrichtung

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0488330A2 (fr) * 1990-11-28 1992-06-03 Kabushiki Kaisha Toshiba Lampe fluorescente
US5714835A (en) * 1993-04-05 1998-02-03 Patent-Treuhand-Gesellschaft F. Elektrische Gluehlampen Mbh Xenon excimer radiation source with fluorescent materials
US6045721A (en) * 1997-12-23 2000-04-04 Patent-Treuhand-Gesellschaft Fur Elekrische Gluhlampen Mbh Barium magnesium aluminate phosphor
EP1119020A2 (fr) * 2000-01-18 2001-07-25 Philips Patentverwaltung GmbH Lampe fluorescente de couleur chaude
EP1253181A2 (fr) * 2001-03-22 2002-10-30 Nec Corporation Phosphores et lampes fluorescentes les comprenant

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5125877A (en) * 1990-01-26 1992-06-30 Brewer's Ledge, Inc. Simulated climbing wall
US5092587A (en) * 1990-09-27 1992-03-03 Ulner Eric R Climbing system
GB9109882D0 (en) * 1991-05-08 1991-07-03 Robinson Donald Climbing equipment
US5732954A (en) * 1994-01-18 1998-03-31 Strickler; James H. Route recording, marking, and scoring apparatus for sport climbing walls
CN1267967C (zh) * 1997-03-21 2006-08-02 电灯专利信托有限公司 背景照明用的平面荧光灯和带有该荧光灯的液晶显示装置
US6074327A (en) * 1997-08-05 2000-06-13 Black Diamond Equipment, Ltd. Climbing hold with reinforcing sleeve
WO2004088705A1 (fr) * 1998-12-01 2004-10-14 Yuichiro Iguchi Substrat pour ecran plasma, ecran plasma et procede de fabrication associe
JP5176084B2 (ja) * 2000-11-30 2013-04-03 中部キレスト株式会社 金属酸化物蛍光体の製造方法

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0488330A2 (fr) * 1990-11-28 1992-06-03 Kabushiki Kaisha Toshiba Lampe fluorescente
US5714835A (en) * 1993-04-05 1998-02-03 Patent-Treuhand-Gesellschaft F. Elektrische Gluehlampen Mbh Xenon excimer radiation source with fluorescent materials
EP1076084A2 (fr) * 1993-04-05 2001-02-14 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Matériaux luminescents pour dispositifs d'illumination
US6045721A (en) * 1997-12-23 2000-04-04 Patent-Treuhand-Gesellschaft Fur Elekrische Gluhlampen Mbh Barium magnesium aluminate phosphor
EP1119020A2 (fr) * 2000-01-18 2001-07-25 Philips Patentverwaltung GmbH Lampe fluorescente de couleur chaude
EP1253181A2 (fr) * 2001-03-22 2002-10-30 Nec Corporation Phosphores et lampes fluorescentes les comprenant

Also Published As

Publication number Publication date
DE10254208A1 (de) 2004-06-03
EP1422741A3 (fr) 2005-03-02
US20040100182A1 (en) 2004-05-27
CA2451289A1 (fr) 2004-05-20

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