EP0981831B1 - Entladungslampe mit dielektrisch behinderten elektroden - Google Patents
Entladungslampe mit dielektrisch behinderten elektroden Download PDFInfo
- Publication number
- EP0981831B1 EP0981831B1 EP99915495A EP99915495A EP0981831B1 EP 0981831 B1 EP0981831 B1 EP 0981831B1 EP 99915495 A EP99915495 A EP 99915495A EP 99915495 A EP99915495 A EP 99915495A EP 0981831 B1 EP0981831 B1 EP 0981831B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- electrodes
- dielectric
- discharge
- discharge vessel
- screen
- 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
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/02—Details
- H01J61/04—Electrodes; Screens; Shields
-
- 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 is based on a discharge lamp according to the preamble of claim 1.
- This discharge lamp has a discharge vessel including a gas filling, at least parts of the discharge vessel being used for radiation of a desired spectral range, in particular light, i.e. visible electromagnetic radiation, or also ultraviolet (UV) and vacuum ultraviolet (VUV) radiation are transparent.
- a desired spectral range in particular light, i.e. visible electromagnetic radiation, or also ultraviolet (UV) and vacuum ultraviolet (VUV) radiation are transparent.
- UV radiation i.e. visible electromagnetic radiation
- VUV vacuum ultraviolet
- the discharge lamp which is suitable for operation by means of dielectric barrier discharge.
- dielectric barrier discharge either the electrodes of one polarity or all electrodes, that is to say both polarities, are separated from the gas filling or from the discharge during operation by means of a dielectric layer (one-sided or two-sided dielectric barrier discharge, see for example WO 94/23442 or EP 0 363 832).
- dielectric barrier is also used for this dielectric layer and the term “barrier discharge” is also used for discharges produced in this way.
- the dielectric barrier does not have to be a layer applied to an electrode specifically for this purpose, but can also be formed, for example, by a discharge vessel wall if electrodes are arranged on the outside of such a wall or inside the wall.
- EMI electromagnetic interference radiation
- the discharge lamp comprise an electrically conductive shield which at least partially surrounds the discharge vessel.
- the shield is electrically isolated from at least one electrode, depending on the electrical potential, and possibly from all electrodes.
- the thickness d D and the dielectric constant ⁇ D of the dielectric as well as the thickness d B and the dielectric constant ⁇ B of the barrier, which are the electrodes separates from the gas filling specifically coordinated so that the following relationships are fulfilled: d D ⁇ D ⁇ F d B ⁇ B and F ⁇ 1.5, preferably F ⁇ 2.0, particularly preferably F ⁇ 2.5.
- the electrical power is already coupled to the shield to an unacceptable degree. Reliable operation of the dielectric barrier discharge within the discharge vessel of the lamp is then no longer reliably guaranteed under all operating conditions.
- the capacitive decoupling of the shield from the dielectric barrier discharge also increases with increasing factor F.
- relatively high factors F are aimed for.
- high factors F mean a large ratio between the thicknesses of the dielectric and the barrier.
- the thickness of the dielectric must be correspondingly greater than the thickness of the barrier in this case.
- the thickness of the dielectric is limited for cost and design reasons. Consequently, there is only the possibility of reducing the thickness of the barrier, which in turn places high demands on the precision of the barrier in order not to negatively influence the uniformity of the dielectric barrier discharge. In a specific individual case, a suitable compromise may have to be made here.
- the dielectric constant ⁇ B of the barrier is larger or even significantly larger than the dielectric constant ⁇ D of the dielectric, correspondingly high factors F can also be realized.
- the dielectric which separates the shield from the electrodes, is formed by the wall of the discharge vessel itself.
- the electrodes with an electrical potential different from the shielding are targeted on the inner wall of the discharge vessel arranged.
- the dielectric between the shield and the electrodes can also be constructed from two or more layers with different dielectric numbers. Under certain circumstances, this can be particularly useful in the area of the electrodes in order to be able to reliably meet the above-mentioned conditions there even with a relatively thin discharge vessel wall.
- the barrier can also be constructed from several layers with different dielectric numbers.
- ⁇ Di , ⁇ Di , d Bi, ⁇ Bi denote the thicknesses or dielectric constants of the respective layer i.
- the index i assumes the value 1 for a single-layer system, the values 1 and 2 for a two-layer system and accordingly the values 1, 2, ... n for an n-layer system.
- the electrodes are arranged such that the layer of the vessel wall facing the interior of the discharge vessel is thinner than the layer facing the shield.
- the shield is designed, for example, as a metallic jacket with an opening.
- the opening defines the effective radiation area of the lamp.
- At least part of the jacket is further developed into cooling fins.
- the jacket performs a double function, namely, on the one hand, the shielding effect and, on the other hand, the dissipation of the heat loss generated by the discharge and / or possibly the electronics for operating the lamp. Since the lamp is expediently in particularly close contact with the jacket, a good homogenization of the temperature distribution along the contact zone between lamp and jacket is also ensured.
- the shielding effect can be further improved if at least the part of the outer wall of the discharge vessel facing the jacket opening is covered by an electrically conductive, transparent layer, e.g. made of indium tin oxide (ITO).
- ITO indium tin oxide
- the jacket and the transparent layer are electrically contacted with one another.
- the jacket can also be realized entirely by the electrically conductive, transparent layer.
- the cooling effect of the jacket must then be dispensed with in this variant.
- the shield can be at floating electrical potential, but is advantageous with a ground, e.g. Earth, connected potential to prevent possible electromagnetic radiation from the shield itself.
- a ground e.g. Earth
- the figure shows a cross section of a rod-shaped aperture fluorescent lamp with shielding in a schematic representation.
- the lamp 1 consists essentially of a tubular discharge vessel 2 with a circular cross-section, which is surrounded by a shield, and three strip-shaped electrodes 3-5, which are applied to the inner wall of the discharge vessel 2 parallel to the longitudinal axis of the tube. Each of the inner wall electrodes 3-5 is covered with a dielectric layer 6-8. Furthermore, with the exception of a rectangular aperture 9, the inner wall of the discharge vessel 2 is provided with a reflection double layer 10 made of Al 2 O 3 and TiO 2 . A phosphor layer 11 is applied to the reflection double layer 10 and also to the inner wall of the vessel in the area of the aperture 9. The reflection double layer 10 reflects the light generated by the phosphor layer 11. In this way, the luminance of the aperture 9 is increased.
- the outer diameter of the tubular discharge vessel 2 is approximately 9 mm.
- Xenon with a filling pressure of 21.3 kPa (160 torr) is located in the discharge vessel 2.
- the electrodes 3-5 are passed gas-tight to the outside through a first end of the discharge vessel 2 and pass there into an external power supply (not shown). At its other end, the discharge vessel 2 is also sealed gas-tight with a dome (not shown) formed from the vessel.
- a first 5 of the three electrodes 3-5 is provided for a first polarity of a supply voltage, while the other two electrodes 4, 5 are provided for the second polarity.
- the first electrode 5 is diametrical to the aperture 9 and the other two electrodes 4, 5 are in the immediate vicinity arranged on both long sides of the aperture 9.
- the width and the length of the aperture 5 are approximately 6.5 mm and 255 mm, respectively.
- the barrier consists of glass solder with a dielectric constant of approx. 8 and a thickness of approx. 250 ⁇ m. This results in a quotient from the barrier thickness to the dielectric constant of approx. 0.031 mm.
- the discharge vessel 2 consists of low-alkali soda-lime glass (Schott # 8350) with a dielectric constant of approx. 7 and a wall thickness of approx. 0.6 mm. This results in a quotient from wall thickness to dielectric constant of approx. 0.086 mm. This quotient is approx. 2.77 times larger than the corresponding quotient for the barrier. Consequently, the relationship required in the general description is fulfilled here.
- the shielding of the lamp 1 consists of a solid, essentially cuboid, metallic jacket 12 and a transparent layer 13.
- the jacket 12 has an opening corresponding to the lamp aperture 9 in such a way that only the aperture 9 of the lamp is visible from the outside.
- the transparent layer 13 consists of indium tin oxide (ITO) and covers the outer wall of the discharge vessel 2 only in the area of the aperture 9.
- ITO indium tin oxide
- the transparent layer 13 is electrically contacted with the jacket 12 along its opening and therefore completes the shielding effect of the jacket 12 versus EMI.
- the jacket 12 has a number of cooling fins 14 on its side opposite the opening.
- a thermal paste 15 improves the heat transfer between the discharge vessel 2 and the jacket 12.
- the phosphor layer 11 is a three-band phosphor. It consists of a mixture of the blue component BaMgAl 10 O 17 : Eu, the green component LaPO 4 : Ce, Tb and the red component (Y, Gd) BO 3 : Eu.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Vessels And Coating Films For Discharge Lamps (AREA)
- Discharge Lamps And Accessories Thereof (AREA)
- Circuit Arrangements For Discharge Lamps (AREA)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19811520 | 1998-03-17 | ||
DE19811520A DE19811520C1 (de) | 1998-03-17 | 1998-03-17 | Entladungslampe mit dielektrisch behinderten Entladungen |
PCT/DE1999/000543 WO1999048134A1 (de) | 1998-03-17 | 1999-03-02 | Entladungslampe mit dielektrisch behinderten elektroden |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0981831A1 EP0981831A1 (de) | 2000-03-01 |
EP0981831B1 true EP0981831B1 (de) | 2001-09-19 |
Family
ID=7861172
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99915495A Expired - Lifetime EP0981831B1 (de) | 1998-03-17 | 1999-03-02 | Entladungslampe mit dielektrisch behinderten elektroden |
Country Status (9)
Country | Link |
---|---|
US (1) | US6304028B1 (ko) |
EP (1) | EP0981831B1 (ko) |
JP (1) | JP4108770B2 (ko) |
KR (1) | KR100563745B1 (ko) |
AT (1) | ATE205961T1 (ko) |
CA (1) | CA2289536C (ko) |
DE (2) | DE19811520C1 (ko) |
HU (1) | HU223240B1 (ko) |
WO (1) | WO1999048134A1 (ko) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004047373A1 (de) * | 2004-09-29 | 2006-04-06 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Beleuchtungssystem mit dielektrisch behinderter Entladungslampe und zugehörigem Vorschaltgerät |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19843419A1 (de) * | 1998-09-22 | 2000-03-23 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Entladungslampe mit dielektrisch behinderten Elektroden |
WO2000075961A1 (fr) * | 1999-06-07 | 2000-12-14 | Toshiba Lighting & Technology Corporation | Tube a decharge, dispositif a tube a decharge et lecteur d'images |
DE19955108A1 (de) * | 1999-11-16 | 2001-05-17 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Entladungslampe mit verbesserter Temperaturhomogenität |
DE10048409A1 (de) * | 2000-09-29 | 2002-04-11 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Entladungslampe mit kapazitiver Feldmodulation |
US6762556B2 (en) | 2001-02-27 | 2004-07-13 | Winsor Corporation | Open chamber photoluminescent lamp |
DE10133326A1 (de) * | 2001-07-10 | 2003-01-23 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Dielektrische Barrieren-Entladungslampe mit Zündhilfe |
WO2004083900A2 (en) * | 2003-03-18 | 2004-09-30 | Philips Intellectual Property & Standards Gmbh | Gas discharge lamp |
US7863816B2 (en) * | 2003-10-23 | 2011-01-04 | General Electric Company | Dielectric barrier discharge lamp |
JP3893404B2 (ja) * | 2003-12-09 | 2007-03-14 | 松下電器産業株式会社 | 光源装置、照明装置、及び液晶表示装置 |
US7196473B2 (en) * | 2004-05-12 | 2007-03-27 | General Electric Company | Dielectric barrier discharge lamp |
DE102004047374A1 (de) * | 2004-09-29 | 2006-04-06 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Dielektrisch behinderte Entladungslampe mit elektrischer Abschirmung |
DE102004047375A1 (de) * | 2004-09-29 | 2006-04-06 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Dielektrische behinderte Entladungslampe mit Manschette |
DE102004047376A1 (de) * | 2004-09-29 | 2006-04-06 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Dielektrisch behinderte Entladungslampe mit steckbaren Elektroden |
JP7429424B2 (ja) | 2020-01-14 | 2024-02-08 | 株式会社ムラコシ精工 | 引戸装置 |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH676168A5 (ko) * | 1988-10-10 | 1990-12-14 | Asea Brown Boveri | |
US5220236A (en) * | 1991-02-01 | 1993-06-15 | Hughes Aircraft Company | Geometry enhanced optical output for rf excited fluorescent lights |
JP3532578B2 (ja) * | 1991-05-31 | 2004-05-31 | 三菱電機株式会社 | 放電ランプおよびこれを用いる画像表示装置 |
US5325024A (en) | 1992-10-16 | 1994-06-28 | Gte Products Corporation | Light source including parallel driven low pressure RF fluorescent lamps |
DE4311197A1 (de) * | 1993-04-05 | 1994-10-06 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Verfahren zum Betreiben einer inkohärent strahlenden Lichtquelle |
JPH10223182A (ja) * | 1997-02-10 | 1998-08-21 | Stanley Electric Co Ltd | 蛍光ランプ |
JP3218561B2 (ja) * | 1997-06-27 | 2001-10-15 | スタンレー電気株式会社 | 蛍光ランプ |
-
1998
- 1998-03-17 DE DE19811520A patent/DE19811520C1/de not_active Expired - Fee Related
-
1999
- 1999-03-02 DE DE59900265T patent/DE59900265D1/de not_active Expired - Lifetime
- 1999-03-02 JP JP54635599A patent/JP4108770B2/ja not_active Expired - Fee Related
- 1999-03-02 CA CA002289536A patent/CA2289536C/en not_active Expired - Fee Related
- 1999-03-02 US US09/423,446 patent/US6304028B1/en not_active Expired - Lifetime
- 1999-03-02 WO PCT/DE1999/000543 patent/WO1999048134A1/de active IP Right Grant
- 1999-03-02 EP EP99915495A patent/EP0981831B1/de not_active Expired - Lifetime
- 1999-03-02 AT AT99915495T patent/ATE205961T1/de not_active IP Right Cessation
- 1999-03-02 HU HU0002438A patent/HU223240B1/hu not_active IP Right Cessation
- 1999-03-02 KR KR1019997010633A patent/KR100563745B1/ko not_active IP Right Cessation
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004047373A1 (de) * | 2004-09-29 | 2006-04-06 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Beleuchtungssystem mit dielektrisch behinderter Entladungslampe und zugehörigem Vorschaltgerät |
Also Published As
Publication number | Publication date |
---|---|
DE19811520C1 (de) | 1999-08-12 |
KR100563745B1 (ko) | 2006-03-24 |
EP0981831A1 (de) | 2000-03-01 |
HUP0002438A3 (en) | 2001-12-28 |
JP4108770B2 (ja) | 2008-06-25 |
WO1999048134A1 (de) | 1999-09-23 |
CA2289536A1 (en) | 1999-09-23 |
CA2289536C (en) | 2007-05-15 |
US6304028B1 (en) | 2001-10-16 |
ATE205961T1 (de) | 2001-10-15 |
HU223240B1 (hu) | 2004-04-28 |
HUP0002438A2 (hu) | 2000-11-28 |
KR20010012672A (ko) | 2001-02-26 |
JP2001526828A (ja) | 2001-12-18 |
DE59900265D1 (de) | 2001-10-25 |
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