EP1267389B1 - Niederdruckgasentladungslampe mit quecksilberfreier Gasfüllung - Google Patents
Niederdruckgasentladungslampe mit quecksilberfreier Gasfüllung Download PDFInfo
- Publication number
- EP1267389B1 EP1267389B1 EP02100705A EP02100705A EP1267389B1 EP 1267389 B1 EP1267389 B1 EP 1267389B1 EP 02100705 A EP02100705 A EP 02100705A EP 02100705 A EP02100705 A EP 02100705A EP 1267389 B1 EP1267389 B1 EP 1267389B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- gas discharge
- low
- pressure gas
- discharge lamp
- 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.)
- Expired - Lifetime
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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
- H01J61/70—Lamps with low-pressure unconstricted discharge having a cold pressure < 400 Torr
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/02—Details
- H01J61/12—Selection of substances for gas fillings; Specified operating pressure or temperature
Definitions
- the invention relates to a low-pressure gas discharge lamp which has a gas discharge vessel, which contains a gas filling, with electrodes and with means for production and maintaining a low pressure gas discharge.
- the generation of light in low-pressure gas discharge lamps is based on the fact that charge carriers, especially electrons, but also ions, through an electric field between the Electrodes of the lamp are accelerated so much that they are in the gas filling of the lamp stimulate them by collisions with the gas atoms or molecules of the gas filling or ionize.
- charge carriers especially electrons, but also ions
- Conventional low-pressure gas discharge lamps contain mercury in the gas filling and also have a fluorescent coating on the inside of the gas discharge vessel. It is a disadvantage of mercury low pressure gas discharge lamps that mercury vapor primarily radiation in the high-energy but invisible UV-C range of the emits electromagnetic spectrum, which is only visible through the phosphors in the much lower-energy radiation must be converted. The energy difference is converted into unwanted heat radiation.
- the mercury in the gas filling is also reinforced as environmentally harmful and Toxic substance viewed in modern mass products due to environmental hazards should be avoided if possible during application, production and disposal should.
- GB 2 014 358 A discloses a low-pressure gas discharge lamp which comprises a discharge vessel, electrodes and a filling which contains at least one copper halide as the UV emitter.
- This copper halide-containing low-pressure gas discharge lamp emits in the visible range and in the UV range at 324.75 and 327.4 nm.
- EP-A-0 316 189 a low pressure gas discharge lamp, the filling of which can contain the active compounds CS 2 or CSe 2 in addition to a buffer gas, is known.
- an electrodeless lamp is known from EP 1 093 152, which contains tin iodide in the gas filling
- a low-pressure gas discharge lamp with a gas discharge vessel that selected a gas filling with a chalcogenide from the group of sulfides, selenides and tellurides, the elements of the 4th main group of Periodic table of the elements, selected from silicon, germanium, tin and lead, and containing a buffer gas, internal or external electrodes and means is equipped to generate and maintain a low pressure gas discharge.
- a molecular gas discharge at low pressure takes place in the lamp according to the invention instead, the radiation in the visible and near UVA range of the electromagnetic spectrum emits. Since it is the radiation of a molecular discharge, the exact location of the continuum by the type of chalcogenide, any other Additives, lamp pressure and operating temperature can be controlled.
- the lamp according to the invention has a visual efficiency that is considerably higher than that of conventional low-pressure mercury discharge lamps.
- the visual efficiency expressed in lumens / watt, is the ratio between the Brightness of the radiation in a certain visible wavelength range and the Generation energy for radiation.
- the high visual efficiency of the invention Lamp means that a certain amount of light due to less power consumption is realized.
- the chalcogenides of the elements of the 4th main group of the PSE e.g. B. silicon, germanium, tin and lead have a high dissociation energy. Therefore, only a small proportion of the molecules in the gas phase are split by electron impact ionization during gas discharge and only a few chalcogenide ions occur during gas discharge. This also has a positive effect on the visual efficiency of the lamp. It also avoids the use of mercury.
- the lamp according to the invention is advantageously used as a UV-A lamp for Sunbeds, disinfection lights and paint curing lights.
- the lamp is combined with appropriate phosphors. Because the Losses due to Stoke's displacement are small, you get visible light with a high luminous efficacy of more than 100 lumens / watt.
- the chalcogenide is selected from the group SiS, GeS, GeSe, GeTe, SnS, SnSe and SnTe.
- the gas filling contains germanium sulfide.
- a gas filling, which contains germanium sulfide is characterized by a high vapor pressure.
- gas filling is a mixture of two or contains more chalcogenides of silicon, germanium, tin and lead.
- the molar ratio n between the Chalcogen and element of the 4th main group of the PSE is 0.8 ⁇ n ⁇ 1.2.
- the gas filling can be a noble gas selected from the group of helium, neon, Argon, Krypton and Xenon include.
- the gas discharge vessel has a phosphor coating on the outer surface.
- the UVA radiation which is emitted by the low-pressure gas discharge lamp according to the invention not absorbed by the common types of glass, but passes through the walls of the discharge vessel almost lossless.
- the fluorescent coating can therefore on the outside of the Gas discharge vessel can be attached. This simplifies the manufacturing process.
- the gas discharge vessel may also be preferred for the gas discharge vessel to have a phosphor coating the inner surface.
- the low-pressure gas discharge lamp from a tubular lamp bulb 1, which has a discharge space surrounds. At both ends of the tube electrodes 2 are melted inside, through which the Gas discharge can be ignited.
- the low pressure gas discharge lamp further comprises in a manner known per se an electrical ballast, the ignition and the Operation of the gas discharge lamp regulates.
- the gas discharge vessel can also be used as a multiply folded or coiled tube executed and be surrounded by an outer bulb.
- the wall of the gas discharge vessel preferably consists of a type of glass, quartz, Aluminum oxide or yttrium aluminum garnet.
- the gas filling consists of a chalcogenide of silicon, germanium, tin and lead in an amount of 2x10 - 11 mol / cm 3 to 2x10 -9 mol / cm 3 and an inert gas.
- the noble gas serves as a buffer gas and facilitates the ignition of the gas discharge.
- the preferred buffer gas is argon.
- Argon can be replaced in whole or in part by another noble gas, such as helium, neon, krypton or xenon.
- Chalcogenides are binary chemical compounds that form a chalcogen, i.e. an element the 6th main group of the Periodic Table of the Elements, as electronegative Component included.
- the chalcogenides which are the preferred Contains chalcogenic sulfur (S), selenium (Se) and tellurium (Te).
- chalcogenides of the elements of the 4th main group of To use PSE in which the molar ratio n between the chalcogen and the Element of the 4th main group of the PSE is 0.8 ⁇ n ⁇ 1.2.
- Table 1 shows the spectroscopic properties of some chalcogenides of the elements of the fourth main group of the PSE summarized.
- T * [K] is the wall temperature of the Lamp in which the partial vapor pressure of the chalcogenide reaches 10 ⁇ bar.
- Trans is the type of radiative transitions in the chalcogenide molecule specified.
- X denotes the electronic ground state of the molecule
- a '," B “,” D “ and “E” is an electronically excited state of the molecule
- D [eV] is the dissociation energy of the chalcogenide in question and ⁇ * a characteristic wavelength of molecular emission.
- One way to increase efficiency is to use two or more chalcogenides Combine silicon, germanium, tin and lead in the gas atmosphere.
- the cold filling pressure of the buffer gas is optimal if the product from the cold filling pressure of the noble gas p with the smallest diameter of the gas discharge vessel d fulfills the condition 0.2 mbar cm ⁇ pd ⁇ 20 mbar cm.
- a further advantageous measure to increase the lumen efficiency of the low-pressure gas discharge lamp has been to check the operating temperature of the lamp by means of suitable design measures, so that an internal temperature corresponding to T * ⁇ 50 [K] according to Table 1 during operation at an outside temperature of 25 ° C
- the internal temperature T * refers to the coldest point of the gas discharge vessel.
- the gas discharge vessel can also be used with a Outer bulb, which is coated with a layer reflecting IR radiation, surrounded become.
- An infrared radiation-reflecting coating made of indium-doped is preferred Tin oxide.
- a suitable material for the electrodes in the low-pressure gas discharge lamp according to the invention consists for example of nickel or a nickel alloy or one refractory metal, in particular tungsten and tungsten alloys, in particular Tungsten alloys with rhenium. Also tungsten composite materials with thorium oxide or indium oxide are suitable.
- the electrodes can still be made with a material lower work function.
- the gas discharge vessel of the lamp is on it Outside surface coated with a phosphor layer 4.
- the UV radiation emitted by the Gas discharge stimulates the phosphors in the phosphor layer to emit light in the visible area 5.
- the chemical composition of the phosphor layer determines the spectrum of the light or its color.
- the materials that can be used as phosphors must be absorb generated radiation and in a suitable wavelength range z. B. for the three primary colors red, blue and green emit and a high fluorescence quantum yield to reach.
- germanium chalcogenides The emission of germanium chalcogenides is mainly in the UV range and to a small extent in the blue spectral range. With the help of the phosphor layer, this bluish-white emission spectrum can be converted into a white light spectrum with a color temperature below 10,000 K.
- the phosphor layer of a white-emitting lamp with germanium chalcogenides can contain a single phosphor which converts the UV radiation into visible light with a wide color spectrum from green to red.
- Such a phosphor is preferably a Ce 3+ -activated phosphor such as Y 3 Al 5 O 12 : Ce or (Y 1-x Gd x ) 3 (Al 1-y Ga y ) 5 O 12 : Ce (0 ⁇ x ⁇ 1, 0 ⁇ y ⁇ 1).
- SrLi 2 SiO 4 : Eu can be used.
- the phosphor layer can contain two or three phosphors. Contains the Fluorescent layer two phosphors, so one phosphor converts UV radiation into red Light and the other phosphor convert UV radiation into green light. In the case of three The phosphor layer contains another phosphor, the UV radiation transformed into blue light.
- the phosphors used should have a strong absorption in the Have range 250 to 400 nm. The emission maximum is preferably a blue-emitting one Phosphor between 440 and 480 nm, a green-emitting Phosphor between 510 and 560 nm and a red-emitting phosphor between 590 and 660 nm. Because the phosphors have a high thermal quenching temperature should preferably be line emitters, broadband emitters with a small Stokes shift or host lattice with low phonon frequencies.
- a blue-emitting phosphor is preferably selected from the group (Ba 1-x Sr x ) MgAl 10 O 17 : Eu (0 ⁇ x ⁇ 1), (Ba 1-x , Sr x ) 5 (PO 4 ) 3 (F , Cl): Eu (0 ⁇ x ⁇ 1), (Ba 1-xy , Sr x , Ca y ) 5 (PO 4 ) 3 (F, Cl): Eu (0 ⁇ x ⁇ 1), (Y 1- x Gd x ) 2 SiO 5 : Ce, ZnS: Ag SrS: Ce, (Ba 1-x Sr x ) MgSi 2 O 8 : Eu (0 ⁇ x ⁇ 1) and (La 1- xGd x ) OBr: Ce ( 0 ⁇ x ⁇ 1).
- a green-emitting phosphor is preferably selected from the group (Ba 1-x Sr x ) MgAl 10 O 17 : Eu, Mn (0 ⁇ x ⁇ 1), (Ba 1-x Sr x ) 2 SiO 4 : Eu (0 ⁇ x ⁇ 1), ZnS: Cu, Al, Au, SrGa 2 S 4 : Eu, (Y 1-x Gd x ) BO 3 : Ce, Tb (0 ⁇ x ⁇ 1), (Y 1-x Gd x ) 2 O 2 S: Tb (0 ⁇ x ⁇ 1), LaOBr: Ce, Tb, CaS: Ce, Ca 2 MgSi 2 O 7 : Eu and (Y 1-x Gd x ) 2 SiO 5 : Ce, Tb ( 0 ⁇ x ⁇ 1).
- a red-emitting phosphor is preferably selected from the group Sr 2 CeO 4 : Eu, (Y 1-x Gd x ) 2 O 3 : Eu, Bi (0 ⁇ x ⁇ 1), (Y 1-x Gd x ) 2 O 3 : Eu, Bi (0 ⁇ x ⁇ 1), YVO 4 : Eu, Y (V 1-x P x ) O 4 : Eu (0 ⁇ x ⁇ 1), Y (V 1-x , P x ) O 4 : Eu, Bi (0 ⁇ x ⁇ 1), Y 2 O 2 S: Eu, Mg 4 GeO 5.5 F: Mn, (Sr 1-x Ca x ) 2 P 2 O 7 : Eu, Mn (0 ⁇ x ⁇ 1), (Sr 1-x Ba x ) 2 Si 5 N 8 : Eu (0 ⁇ x ⁇ 1), Ca 2 Si 5 N 8 : Eu, CaS: Ce, Mn and (Ca 1-x Sr x ) S: Eu (0 ⁇ x ⁇ 1).
- Oxidation-sensitive phosphors such as BaMgAl 10 O 17 : Eu
- Oxidation-sensitive phosphors can be used in the phosphor layer if the phosphor particles are coated with a protective layer of, for example, SiO 2 , MgO, LaPO 4 , AlPO 4 , YPO 4 , MgAl 2 O 4 , Y 2 O 3 , La 2 O 3 , Ca 2 P 2 O 7 or Al 2 O 3 are provided.
- the specific weight of the phosphor layer is preferably between 0.1 and 10 mg / cm 2 .
- Suitable phosphors and phosphor combinations do not have to be on the inside of the Gas discharge vessel are applied, but can also be applied to the outside be because the radiation generated in the UVA range from the common types of glass is not absorbed.
- the lamp is a capacitive with a high frequency field with a frequency of, for example, 2.65 MHz, 13.56 MHz or 2.4 GHz excited lamp in which the electrodes are attached to the outside of the gas discharge vessel
- the lamp is an inductively excited lamp with a high-frequency field with a frequency of, for example, 2.65 MHz, 13.56 MHz or 2.4 GHz.
- the electrons emitted by the electrodes excite the atoms and molecules of the gas filling to emit UV radiation from the characteristic radiation and a molecular continuum.
- the discharge heats the gas filling in such a way that the desired vapor pressure and the desired operating temperature is reached at which the luminous efficacy is optimal.
- the radiation of the gas filling generated during operation has an intense, broad, continuous molecular spectrum which is caused by the molecular discharge of the chalcogenide.
- the range of maximum emission of the continuous molecular spectrum usually shifts to longer wavelengths with increasing molecular weight of the chalcogenide.
- a cylindrical discharge vessel made of a glass that is transparent to UVA radiation, with a length of 14 cm and a diameter of 2.5 cm with external electrodes made of copper.
- the discharge vessel is evacuated and at the same time 0.3 mg GeSe metered in.
- Argon is also filled in at a cold pressure of 5 mbar. It is an alternating current with a frequency of 13.65 MHz from an external AC power supply and the at an operating temperature of 433 ° C. Lumen efficiency measured. The lumen efficiency is 100 Lm / W.
Landscapes
- Discharge Lamp (AREA)
- Luminescent Compositions (AREA)
Description
Aus EP-A-0 316 189 eine Niederdruckgasentladungslampe, deren Füllung neben einem Puffergas die aktiven Verbindungen CS2oder CSe2enthalten kann, bekannt. Weiterhin ist aus EP 1 093 152 eine elektrodenlose Lampe, die Zinnjodid in der Gasfüllung enthält bekannt
Außerdem wird die Verwendung von Quecksilber vermieden.
- Fig. 1
- zeigt schematisch die Lichterzeugung in einer Niederdruckgasentladungslampe mit einer Gasfüllung, die Germaniumselenid enthält.
Als weitere vorteilhafte Maßnahme zur Steigerung der Lumeneffizienz der Niederdruckgasentladungslampe hat sich die Kontrolle der Betriebstemperatur der Lampe durch geeignete konstruktive Maßnahmen erwiesen, so dass während des Betriebes bei einer Außentemperatur von 25 °C eine Innentemperatur entsprechend T* ± 50 [K] gemäß Tab. 1 erreicht wird Die Innentemperatur T* bezieht sich auf die kälteste Stelle des Gasentladungsgefäßes.
Mit Hilfe der Leuchtstoffschicht kann dieses bläulich-weiße Emissionspektrum in ein weißes Lichtspektrum mit einer Farbtemperatur unter 10.000 K überführt werden. Die Leuchtstoffschicht einer weiß-emittierenden Lampe mit Germaniumchalkogeniden kann zu diesem Zweck einen einzelnen Leuchtstoff enthalten, der die UV-Strahlung in sichtbares Licht mit einem breiten Farbspektrum von grün bis rot überführt. Ein solcher Leuchtstoff ist vorzugsweise ein Ce3+-aktivierter Leuchtstoff wie beispielsweise Y3Al5O12:Ce oder (Y1-xGdx)3(Al1-yGay)5O12:Ce (0 ≤ x ≤ 1, 0 ≤ y ≤ 1). Alternativ kann SrLi2SiO4:Eu verwendet werden.
Ein rot-emittierender Leuchtstoff ist vorzugsweise ausgewählt aus der Gruppe Sr2CeO4:Eu, (Y1-xGdx)2O3:Eu,Bi (0 ≤ x ≤ 1), (Y1-xGdx)2O3:Eu,Bi (0≤x≤1), YVO4:Eu, Y(V1-xPx)O4:Eu (0≤x≤1), Y(V1-x,Px)O4:Eu,Bi (0≤x≤1), Y2O2S:Eu, Mg4GeO5.5F:Mn, (Sr1-xCax)2P2O7:Eu,Mn (0≤x≤1), (Sr1-xBax)2Si5N8:Eu(0≤x≤1), Ca2Si5N8:Eu, CaS:Ce, Mn und (Ca1-xSrx)S:Eu (0≤x≤1).
Wenn die Lampe gezündet wird, regen die von den Elektroden emittierten Elektronen die Atome und Moleküle der Gasfüllung zur Ausstrahlung von UV-Strahlung aus der charakteristischen Strahlung und einem Molekülkontinuum an.
Eigenschaften von Chalkogeniden | ||||
T*[K] | Trans. | D[eV] | λ*[nm] | |
SiS | 870 | E→X D→X | 6.4 | 238 285 |
GeS | 640 | E→X A→X | 5.67 | 257 304 |
GeSe | 670 | E→X A→X | 4.9 | 282 324 |
GeTe | 760 | E→X A→X | 4.2 | 318 360 |
SnS | 850 | B→X A→X | 4.77 | 423 436 |
SnSe | 850 | E→X D→X | 4.2 | 325 363 |
SnTe | B→X A→X | 3.69 | 490 594 |
Claims (9)
- Niederdruckgasentladungslampe, ausgerüstet mit einem Gasentladungsgefäß, das eine Gasfüllung mit einem Chalkogenid, ausgewählt aus der Gruppe der Sulfide, Selenide und Telluride, der Elemente der 4. Hauptgruppe des Periodischen Systems der Elemente, ausgewählt aus Silicium, Germanium, Zinn und Blei, und mit einem Puffergas enthält, mit inneren oder äußeren Elektroden und mit Mitteln zur Erzeugung und Aufrechterhaltung einer Niederdruckgasentladung.
- Niederdruckgasendadungslampe gemäß Anspruch 1,
dadurch gekennzeichnet, dass das Chalkogenid ausgewählt ist aus der Gruppe SiS, GeS, GeSe, GeTe, SnS, SnSe und SnTe. - Niederdruckgasentladungslampe gemäß Anspruch 1,
dadurch gekennzeichnet, dass die Gasfüllung Germaniumselenid GeSe enthält. - Niederdruckgasentladungslampe gemäß Anspruch 1,
dadurch gekennzeichnet, dass die Gasfüllung Germaniumsulfid GeS enthält. - Niederdruckgasentladungslampe gemäß Anspruch 1,
dadurch gekennzeichnet, dass die Gasfüllung ein Gemisch aus zwei oder mehreren Chalkogeniden, ausgewählt aus der Gruppe der Sulfide, Selenide und Telluride, des Siliciums, Germaniums, Zinns und Bleis enthält. - Niederdruckgasentladungslampe gemäß Anspruch 1,
dadurch gekennzeichnet, dass in dem Chalkogenid das molare Verhältnis n zwischen dem Chalkogen und dem Element der 4. Hauptgruppe des PSE, ausgewählt ist aus Silicium, Germanium, Zinn und Blei, gleich 0,8 ≤ n ≤1,2 ist. - Niederdruckgasentladungslampe gemäß Anspruch 1,
dadurch gekennzeichnet, dass die Gasfüllung als Puffergas ein Edelgas, ausgewählt aus der Gruppe Helium, Neon, Argon, Krypton und Xenon, umfasst. - Niederdruckgasentladungslampe gemäß Anspruch 1,
dadurch gekennzeichnet, dass das Gasentladungsgefäß einen Leuchtstoffüberzug auf der äußeren Oberfläche aufweist. - Niederdruckgasentladungslampe gemäß Anspruch 1,
dadurch gekennzeichnet, dass das Gasentladungsgefäß einen Leuchtstoffüberzug auf der inneren Oberfläche aufweist.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10128915 | 2001-06-15 | ||
DE10128915A DE10128915A1 (de) | 2001-06-15 | 2001-06-15 | Niederdruckgasentladungslampe mit quecksilberfreier Gasfüllung |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1267389A1 EP1267389A1 (de) | 2002-12-18 |
EP1267389B1 true EP1267389B1 (de) | 2004-11-17 |
Family
ID=7688300
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02100705A Expired - Lifetime EP1267389B1 (de) | 2001-06-15 | 2002-06-13 | Niederdruckgasentladungslampe mit quecksilberfreier Gasfüllung |
Country Status (5)
Country | Link |
---|---|
US (1) | US6731070B2 (de) |
EP (1) | EP1267389B1 (de) |
JP (1) | JP2003007248A (de) |
CN (1) | CN1311512C (de) |
DE (2) | DE10128915A1 (de) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10044562A1 (de) * | 2000-09-08 | 2002-03-21 | Philips Corp Intellectual Pty | Niederdruckgasentladungslampe mit quecksilberfreier Gasfüllung |
DE10127961A1 (de) * | 2001-06-08 | 2002-12-12 | Philips Corp Intellectual Pty | Gasentladungslampe |
ATE385039T1 (de) * | 2003-08-07 | 2008-02-15 | Koninkl Philips Electronics Nv | Niederdruck-gasentladungslampe mit erdalkali- chalkogeniden als elektronenemittermaterial |
JP2007513469A (ja) * | 2003-11-11 | 2007-05-24 | 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 | 水銀を含まないガスが充填された低圧蒸気放電ランプ |
WO2006035339A1 (en) * | 2004-09-28 | 2006-04-06 | Philips Intellectual Property & Standards Gmbh | Low-pressure gas discharge lamp |
US7265493B2 (en) * | 2004-10-04 | 2007-09-04 | General Electric Company | Mercury-free compositions and radiation sources incorporating same |
US7847484B2 (en) * | 2004-12-20 | 2010-12-07 | General Electric Company | Mercury-free and sodium-free compositions and radiation source incorporating same |
US7358656B1 (en) | 2005-02-04 | 2008-04-15 | Technical Consumer Products, Inc. A Delaware Corporation | Universal cooling points for fluorescent lamps |
EP2022079A2 (de) * | 2006-05-01 | 2009-02-11 | Koninklijke Philips Electronics N.V. | Niederdruckentladungslampe |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL7107535A (de) * | 1971-06-02 | 1972-12-05 | ||
GB2014358B (en) | 1978-02-10 | 1982-03-03 | Thorn Electrical Ind Ltd | Discharge lamp |
IL84463A (en) | 1987-11-12 | 1992-06-21 | Yissum Res Dev Co | Ir-radiation source and method for producing same |
US5300859A (en) * | 1987-11-12 | 1994-04-05 | Yissum Research Development Company Of The Hebrew University Of Jerusalem | IR-radiation source and method for producing same |
GB8922862D0 (en) | 1989-10-11 | 1989-11-29 | Emi Plc Thorn | A discharge tube arrangement |
KR20010037340A (ko) * | 1999-10-15 | 2001-05-07 | 구자홍 | 요오드화주석을 사용한 무전극램프 |
-
2001
- 2001-06-15 DE DE10128915A patent/DE10128915A1/de not_active Withdrawn
-
2002
- 2002-06-11 US US10/167,181 patent/US6731070B2/en not_active Expired - Fee Related
- 2002-06-12 CN CNB02126581XA patent/CN1311512C/zh not_active Expired - Fee Related
- 2002-06-13 EP EP02100705A patent/EP1267389B1/de not_active Expired - Lifetime
- 2002-06-13 DE DE50201546T patent/DE50201546D1/de not_active Expired - Fee Related
- 2002-06-14 JP JP2002174632A patent/JP2003007248A/ja active Pending
Also Published As
Publication number | Publication date |
---|---|
CN1392588A (zh) | 2003-01-22 |
DE10128915A1 (de) | 2002-12-19 |
US20030001505A1 (en) | 2003-01-02 |
DE50201546D1 (de) | 2004-12-23 |
US6731070B2 (en) | 2004-05-04 |
JP2003007248A (ja) | 2003-01-10 |
CN1311512C (zh) | 2007-04-18 |
EP1267389A1 (de) | 2002-12-18 |
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