WO2004023518A1 - Double-tubes fluorescent lamp - Google Patents

Double-tubes fluorescent lamp Download PDF

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Publication number
WO2004023518A1
WO2004023518A1 PCT/KR2003/001804 KR0301804W WO2004023518A1 WO 2004023518 A1 WO2004023518 A1 WO 2004023518A1 KR 0301804 W KR0301804 W KR 0301804W WO 2004023518 A1 WO2004023518 A1 WO 2004023518A1
Authority
WO
WIPO (PCT)
Prior art keywords
glass tube
double
tubes
fluorescent lamp
glass
Prior art date
Application number
PCT/KR2003/001804
Other languages
French (fr)
Inventor
Guang-Sup Cho
Original Assignee
Guang-Sup Cho
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
Priority claimed from KR10-2003-0021639A external-priority patent/KR100433193B1/en
Application filed by Guang-Sup Cho filed Critical Guang-Sup Cho
Priority to AU2003258864A priority Critical patent/AU2003258864A1/en
Publication of WO2004023518A1 publication Critical patent/WO2004023518A1/en

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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
    • H01J61/34—Double-wall vessels or containers

Definitions

  • the present invention relates to a fluorescent lamp, and more particularly, to a double-tubes fluorescent lamp comprising two coaxially aligned glass tubes each having different cross section diameter.
  • fluorescent lamps have high brightness when they are made of glass tubes having small diameter.
  • a radiant area needs to be increased. Therefore, it was difficult to obtain both high brightness and high intensity of radiation.
  • One of conventional double-tubes fluorescent lamp is disclosed in the Korean Patent Publication No. 2002-34762.
  • the second glass tube (82) is inserted into the first glass tube (81), and a fluorescent material is applied on the inner surface of the first glass tube (81).
  • the first electrode (85a) and the second electrode (85b) are disposed in the second glass tube (82), and an insulating material is inserted between the first electrode (85a) and the second electrode (85b).
  • a double-tubes fluorescent lamp comprising a first glass tube; a second glass tube disposed to embrace the first glass tube, and aligned coaxially with the first glass tube; a discharge chamber formed by sealing a gab between the first glass tube and the second glass tube at each end portion of the glass tubes; a fluorescent material applied on the outside surface of the first glass tube and the inside surface of the second glass tube; and a pair of electrodes each formed on end portions of the first and the second glass tubes respectively is disclosed in the present invention.
  • the fluorescence material applied on the outside surface of the first glass tube may be thicker than the fluorescent material applied on the inside surface of the second glass tube.
  • the electrode may extend from the inside surface of the first glass tube to the outside surface of the second glass tube, and the portion of the electrode formed on the inside surface of the first glass tube is longer than the portion of the electrode formed on the outside surface of the second glass tube.
  • an additional metallic electrode may be formed on the inside surface of the first glass tube at middle portion of the first glass tube.
  • the discharge chamber may have large cross sectional area at each end portion of the double-tubes fluorescent lamp than at the middle portion of the double-tubes fluorescent lamp.
  • FIG. 1A is a perspective view of the double-tubes fluorescent lamp according to the first embodiment of the present invention.
  • FIG. IB is a cross sectional view cut along X-Y in FIG. 1 A.
  • FIG. 1C is a cross sectional view cut along A-A in FIG. IB.
  • FIG. ID is a cross sectional view cut along B-B in FIG. IB.
  • FIG. IE and FIG. IF are cross sectional views of a modified type of the first embodiment of the present invention.
  • FIG. 2A is a perspective view of a double-tubes fluorescent lamp according to the second embodiment of the present invention.
  • FIG. 2B is a cross sectional view of a double-tubes fluorescent lamp of FIG. 2A
  • FIG. 2C shows the electrical connection of the fluorescent lamps of the second embodiment and a power supply.
  • FIG. 3 is a cross sectional view of a conventional double-tubes fluorescent lamp.
  • FIG. 1A shows the double-tubes fluorescent lamp according to the first embodiment of the present invention.
  • the double-tubes fluorescent lamp comprises a discharge chamber made by sealing the gap between the first glass tube (10) and second glass tube (11) at both end portions of the glass tubes (10,11), and electrodes (20) formed on the sealed portions of the first glass tube (10) and the second glass tube (11).
  • FIG. IB shows the cross sectional view of the double-tubes fluorescent lamp cut along X-Y in FIG. 1 A.
  • FIG. 1C shows a cross sectional view cut along A-A
  • FIG. ID shows a cross sectional view cut along B-B, in FIG. IB.
  • the cross section of the discharge chamber has a ring shape.
  • the discharge chamber is formed by the walls of the first glass tube (10) and the second glass tube (11), and a discharge gas is confined in the discharge chamber. If a high voltage power is applied through the external electrode (20), the discharge gas becomes plasma state, and the ultraviolet lay produced by the plasma stimulates the fluorescent material layers (30, 31) and a visible light is emitted from the double-tubes fluorescent lamp.
  • the fluorescent material layer (30) formed on the outside surface of the first glass tube (10) is thicker that the fluorescent material layer (31) formed on the inner surface of the second glass tube (11).
  • the double-tubes fluorescent lamp becomes to have a reflective lay-emitting type structure.
  • the lay emitting efficiency of the reflective lay-emitting type structure is better than that of the translucent lay-emitting type by about two times.
  • each electrode (20) extends from the outside surface of the second glass tube (11) to the inside surface of the first glass tube (10).
  • the span of electrode (20) formed on the outer surface of the second glass tube (11) is smaller than that of electrodes (20) formed on the inner surface of the first glass tube (10). According to the above-disclosed structure, a non-emitting area formed by the electrodes (20) formed on the outer surface of the second glass tube (11) becomes minimized. In addition, an uniform discharge could be made in the discharge chamber, and a discharge voltage could be reduced by enlarging the span of the electrodes (20) formed on the inner surface of the first glass tube (10).
  • An additional electrode (23) may be formed on the inner surface of the first glass tube (10) approximately at central portion of the first glass tube (10) in order to efficiently prevent the plasma channeling phenomenon.
  • the electrode (23) might ensure stable generation of plasma throughout the entire discharge chamber. In case the span of the glass tube (10) is short, the electrode (23) needs not to be installed.
  • FIG. IE and FIG. IF are cross sectional views of the double-tubes fluorescent lamp whose discharge chamber has larger cross sectional area at the each end portion of the double-tubes fluorescent lamps than at the central portion of the double-tubes fluorescent lamps.
  • the first glass tube (10)'s diameter is larger at the central portion of the first glass tube (10) than at the end portion of the first glass tube (10). Therefore, the cross sectional area of the discharge chamber is larger at the end portion of the double-tubes fluorescent lamp, where the electrodes (20) are formed.
  • the second glass tube (1 l)'s diameter is smaller at the central portion of the second glass tube (11) than at the end portion of the first glass tube (11). Therefore, the cross sectional area of the discharge chamber is larger at the end part of the double-tubes fluorescent lamp, where the electrodes (20) are formed.
  • the external electrodes (20) can efficiently induce discharge.
  • the electrodes (20, 21) are usually made by applying metallic materials on the end portions of the glass tube, but could be made also by covering the end portions of the glass tube with metallic caps.
  • the inside of the first glass tube (10) may be filled with insulation materials (not shown in the figures) in order to displace air.
  • a predetermined alternating power may be supplied to the double tube-fluorescent lamp through the electrode (20, 21).
  • the alternating power is applied to the electrodes (20), and no power may be applied to the electrode (21) formed on the central part of the first glass tube (10) or the electrode (21) may be grounded.
  • FIG. 2 A -FIG. 2C show the second embodiment of the present invention.
  • the span of the double-tubes fluorescent lamp is almost same as the diameter of the first glass tube (10).
  • FIG 2A is a perspective view of the double-tubes whose span (1) is almost same as the diameter (R).
  • FIG. 2B is a cross sectional view of the double-tubes fluorescent lamp.
  • the alternating power can be applied to the electrodes (20, 21) as the first embodiment.
  • the following structure can be adopted because the span of the double-tubes fluorescent lamp is short.
  • the high voltage power may be applied to the electrode (21) formed on the inside surface of the first glass tube (10), and electrodes (20) formed at the both end portions of the first glass tube (10) and the second glass tube (11) are grounded.
  • the plasma generation starts from the central portion to the both end portions of the glass tubes. Therefore, the brightness at the central part of the fluorescent lamp could be reduced.
  • a lighting apparatus could be made by electrically connecting a plurality of the double-tubes fluorescent lamps.
  • the above-disclosed lighting apparatus could be easily bended, therefore, it is possible to form specific shapes or characters.
  • the power supply may be installed inside the hole.
  • the fluorescent lamp of the present invention has double-tubes structure, the area on which fluorescent materials might be applied could broaden. Therefore, the intensity of the radiation could be increased and the high brightness could be obtained simultaneously. In addition, high efficiency could be obtained, because the discharge path could be lengthened compared with the conventional double-tubes fluorescent lamp.
  • the double fluorescent lamp of the present invention could provide good durability, high brightness, high intensity of radiation. Therefore, the fluorescent lamp of the present invention could be successfully used for a lighting apparatus, a backlight for LCD, a light source for a photocopying machine, and a light source for a sign board.

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  • Vessels And Coating Films For Discharge Lamps (AREA)

Abstract

The present invention provides a double-tubes fluorescent lamp comprising a first glass tube, a second glass tube disposed to embrace the first glass tube, and aligned coaxially with the first glass tube, a discharge chamber formed by sealing a gab between the first glass tube and the second glass tube at each ends of the glass tubes, a fluorescent material applied on the outside wall of the first glass tube and the inside wall of the second glass tube and a pair of electrodes each formed on end portions of the first and the second glass tubes respectively Preferably, the double-tubes fluorescent lamp of the present invention. The double-tubes fluorescent lamp of the present invention can provide stable discharge. Therefore, high brightness and high intensity of radiation could be obtained simultaneously.

Description

DOUBLE-TUBES FLUORESCENT LAMP
Technical Field The present invention relates to a fluorescent lamp, and more particularly, to a double-tubes fluorescent lamp comprising two coaxially aligned glass tubes each having different cross section diameter.
Background Art In the conventional art, fluorescent lamps have high brightness when they are made of glass tubes having small diameter. However, in order to obtain high intensity of radiation, a radiant area needs to be increased. Therefore, it was difficult to obtain both high brightness and high intensity of radiation.
As a means for obtaining the fluorescence lamp having both high brightness and high intensity of radiation, a double-tubes fluorescent lamp was disclosed.
One of conventional double-tubes fluorescent lamp is disclosed in the Korean Patent Publication No. 2002-34762. As shown in FIG. 3, the second glass tube (82) is inserted into the first glass tube (81), and a fluorescent material is applied on the inner surface of the first glass tube (81). The first electrode (85a) and the second electrode (85b) are disposed in the second glass tube (82), and an insulating material is inserted between the first electrode (85a) and the second electrode (85b). However, it is difficult to make uniform plasma state in the discharge chamber of the above-disclosed structure. Therefore, a plasma channeling phenomenon could easily happen, and induce loss of brightness and the inefficiency of the fluorescent lamp.
Disclosure of Invention
It is an object of the present invention to provide a double-tubes fluorescent lamp having high brightness and high intensity of radiation, by solving the above-disclosed technical problems such as the plasma channeling phenomenon. In order to achieve the above-described object, A double-tubes fluorescent lamp comprising a first glass tube; a second glass tube disposed to embrace the first glass tube, and aligned coaxially with the first glass tube; a discharge chamber formed by sealing a gab between the first glass tube and the second glass tube at each end portion of the glass tubes; a fluorescent material applied on the outside surface of the first glass tube and the inside surface of the second glass tube; and a pair of electrodes each formed on end portions of the first and the second glass tubes respectively is disclosed in the present invention.
Preferably, the fluorescence material applied on the outside surface of the first glass tube may be thicker than the fluorescent material applied on the inside surface of the second glass tube.
Preferably, the electrode may extend from the inside surface of the first glass tube to the outside surface of the second glass tube, and the portion of the electrode formed on the inside surface of the first glass tube is longer than the portion of the electrode formed on the outside surface of the second glass tube.
Preferably, an additional metallic electrode may be formed on the inside surface of the first glass tube at middle portion of the first glass tube. In addition, the discharge chamber may have large cross sectional area at each end portion of the double-tubes fluorescent lamp than at the middle portion of the double-tubes fluorescent lamp.
Brief Description of Drawings
FIG. 1A is a perspective view of the double-tubes fluorescent lamp according to the first embodiment of the present invention.
FIG. IB is a cross sectional view cut along X-Y in FIG. 1 A. FIG. 1C is a cross sectional view cut along A-A in FIG. IB.
FIG. ID is a cross sectional view cut along B-B in FIG. IB.
FIG. IE and FIG. IF are cross sectional views of a modified type of the first embodiment of the present invention.
FIG. 2A is a perspective view of a double-tubes fluorescent lamp according to the second embodiment of the present invention.
FIG. 2B is a cross sectional view of a double-tubes fluorescent lamp of FIG. 2A FIG. 2C shows the electrical connection of the fluorescent lamps of the second embodiment and a power supply. FIG. 3 is a cross sectional view of a conventional double-tubes fluorescent lamp.
Detailed Description of Preferred Embodiment
Hereinafter, preferred embodiments of the present invention will be explained in detail with reference to the accompanied figures. FIG. 1A shows the double-tubes fluorescent lamp according to the first embodiment of the present invention. The double-tubes fluorescent lamp comprises a discharge chamber made by sealing the gap between the first glass tube (10) and second glass tube (11) at both end portions of the glass tubes (10,11), and electrodes (20) formed on the sealed portions of the first glass tube (10) and the second glass tube (11). FIG. IB shows the cross sectional view of the double-tubes fluorescent lamp cut along X-Y in FIG. 1 A. Referring to FIG. IB, two glass tubes having different cross section diameter, the first glass tube (10) and the second glass tube (11) are coaxially aligned, the gabs between the first glass tube (10) and the second glass tube (11) are sealed at the both end portions of the two glass tubes (10,11). The external electrodes (20) are formed on the ends of the glass tubes (10, 11). The fluorescent material layers (30, 31) are formed on the outer surface of the first glass tube (10) and the inner surface of the second glass tube (11). FIG. 1C shows a cross sectional view cut along A-A, and FIG. ID shows a cross sectional view cut along B-B, in FIG. IB. As shown in FIG. 1C and FIG ID, the cross section of the discharge chamber has a ring shape. As described above, the discharge chamber is formed by the walls of the first glass tube (10) and the second glass tube (11), and a discharge gas is confined in the discharge chamber. If a high voltage power is applied through the external electrode (20), the discharge gas becomes plasma state, and the ultraviolet lay produced by the plasma stimulates the fluorescent material layers (30, 31) and a visible light is emitted from the double-tubes fluorescent lamp.
Preferably, the fluorescent material layer (30) formed on the outside surface of the first glass tube (10) is thicker that the fluorescent material layer (31) formed on the inner surface of the second glass tube (11). According to the above-disclosed structure in which the fluorescent material layer (31) has a large thickness, the double-tubes fluorescent lamp becomes to have a reflective lay-emitting type structure. Generally, the lay emitting efficiency of the reflective lay-emitting type structure is better than that of the translucent lay-emitting type by about two times. Preferably, each electrode (20) extends from the outside surface of the second glass tube (11) to the inside surface of the first glass tube (10). More preferably, the span of electrode (20) formed on the outer surface of the second glass tube (11) is smaller than that of electrodes (20) formed on the inner surface of the first glass tube (10). According to the above-disclosed structure, a non-emitting area formed by the electrodes (20) formed on the outer surface of the second glass tube (11) becomes minimized. In addition, an uniform discharge could be made in the discharge chamber, and a discharge voltage could be reduced by enlarging the span of the electrodes (20) formed on the inner surface of the first glass tube (10).
An additional electrode (23) may be formed on the inner surface of the first glass tube (10) approximately at central portion of the first glass tube (10) in order to efficiently prevent the plasma channeling phenomenon. The electrode (23) might ensure stable generation of plasma throughout the entire discharge chamber. In case the span of the glass tube (10) is short, the electrode (23) needs not to be installed.
FIG. IE and FIG. IF are cross sectional views of the double-tubes fluorescent lamp whose discharge chamber has larger cross sectional area at the each end portion of the double-tubes fluorescent lamps than at the central portion of the double-tubes fluorescent lamps.
As shown in FIG. IE, the first glass tube (10)'s diameter is larger at the central portion of the first glass tube (10) than at the end portion of the first glass tube (10). Therefore, the cross sectional area of the discharge chamber is larger at the end portion of the double-tubes fluorescent lamp, where the electrodes (20) are formed.
As shown in FIG. IF, the second glass tube (1 l)'s diameter is smaller at the central portion of the second glass tube (11) than at the end portion of the first glass tube (11). Therefore, the cross sectional area of the discharge chamber is larger at the end part of the double-tubes fluorescent lamp, where the electrodes (20) are formed.
According to the structures disclosed in FIG. IE and FIG. IF, the external electrodes (20) can efficiently induce discharge.
The electrodes (20, 21) are usually made by applying metallic materials on the end portions of the glass tube, but could be made also by covering the end portions of the glass tube with metallic caps. In addition, the inside of the first glass tube (10) may be filled with insulation materials (not shown in the figures) in order to displace air.
A predetermined alternating power may be supplied to the double tube-fluorescent lamp through the electrode (20, 21). Preferably, the alternating power is applied to the electrodes (20), and no power may be applied to the electrode (21) formed on the central part of the first glass tube (10) or the electrode (21) may be grounded.
FIG. 2 A -FIG. 2C show the second embodiment of the present invention.
According to the second embodiment of the present invention, the span of the double-tubes fluorescent lamp is almost same as the diameter of the first glass tube (10). FIG 2A is a perspective view of the double-tubes whose span (1) is almost same as the diameter (R). FIG. 2B is a cross sectional view of the double-tubes fluorescent lamp.
In the second embodiment, the alternating power can be applied to the electrodes (20, 21) as the first embodiment. However, the following structure can be adopted because the span of the double-tubes fluorescent lamp is short. Referring to FIG. 2B, the high voltage power may be applied to the electrode (21) formed on the inside surface of the first glass tube (10), and electrodes (20) formed at the both end portions of the first glass tube (10) and the second glass tube (11) are grounded. In this type of fluorescent lamp driving structure, the plasma generation starts from the central portion to the both end portions of the glass tubes. Therefore, the brightness at the central part of the fluorescent lamp could be reduced.
As shown in FIG. 2C, a lighting apparatus could be made by electrically connecting a plurality of the double-tubes fluorescent lamps. The above-disclosed lighting apparatus could be easily bended, therefore, it is possible to form specific shapes or characters. In case the diameter of the hole of the double-tubes fluorescent lamp is large, the power supply may be installed inside the hole.
Although the present invention has been described with reference to the specific embodiments, it should be understood that the embodiment is merely illustrative and those skilled in the art will make various modifications and its equivalents from the embodiment.
Therefore, the scope of the present invention must be defined by the claims attached hereto.
Industrial Applicability
Because the fluorescent lamp of the present invention has double-tubes structure, the area on which fluorescent materials might be applied could broaden. Therefore, the intensity of the radiation could be increased and the high brightness could be obtained simultaneously. In addition, high efficiency could be obtained, because the discharge path could be lengthened compared with the conventional double-tubes fluorescent lamp.
As a result, the double fluorescent lamp of the present invention could provide good durability, high brightness, high intensity of radiation. Therefore, the fluorescent lamp of the present invention could be successfully used for a lighting apparatus, a backlight for LCD, a light source for a photocopying machine, and a light source for a sign board.

Claims

1. A double-tubes fluorescent lamp comprising: a first glass tube; a second glass tube disposed to embrace the first glass tube, and aligned coaxially with the first glass tube; a discharge chamber formed by sealing a gab between the first glass tube and the second glass tube at each end portion of the glass tubes; a fluorescent material applied on the outside surface of the first glass tube and the inside surface of the second glass tube; and a pair of electrodes each formed on end portions of the first and the second glass tubes respectively.
2. The double-tubes fluorescent lamp of claim 1, wherein the fluorescence material applied on the outside surface of the first glass tube is thicker than the fluorescent material applied on the inside surface of the second glass tube.
3. The double-tubes fluorescent lamp of claim 1, wherein the electrode extends from the inside surface of the first glass tube to the outside surface of the second glass tube, and the portion of the electrode formed on the inside surface of the first glass tube is longer than the portion of the electrode formed on the outside surface of the second glass tube.
4. The double-tubes fluorescent lamp of claim 1, wherein an additional metallic electrode is formed on the inside surface of the first glass tube at middle portion of the first glass tube.
5. The double-tubes fluorescent lamp of claim 1, wherein the discharge chamber has large cross sectional area at each end portion of the double-tubes fluorescent lamp than at the middle portion of the double-tubes fluorescent lamp.
6. The double-tubes fluorescent lamp of claim 1, wherein a diameter of the double-tubes fluorescent lamp is similar to a span length of the double-tubes fluorescent lamp.
PCT/KR2003/001804 2002-09-05 2003-09-03 Double-tubes fluorescent lamp WO2004023518A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003258864A AU2003258864A1 (en) 2002-09-05 2003-09-03 Double-tubes fluorescent lamp

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR10-2002-0053421 2002-09-05
KR20020053421 2002-09-05
KR10-2003-0021639 2003-04-07
KR10-2003-0021639A KR100433193B1 (en) 2002-09-05 2003-04-07 Double-tubes fluorescent lamp

Publications (1)

Publication Number Publication Date
WO2004023518A1 true WO2004023518A1 (en) 2004-03-18

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WO (1) WO2004023518A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008096292A1 (en) * 2007-02-07 2008-08-14 Philips Intellectual Property & Standards Gmbh Dielectric barrier discharge lamp
US7745997B2 (en) * 2006-01-07 2010-06-29 Kwang Woon Display Technology Co., Ltd. Multi-electrodes double tube fluorescent lamp
DE102009030310A1 (en) * 2009-06-24 2010-12-30 Osram Gesellschaft mit beschränkter Haftung Dielectric barrier discharge lamp with discharge spaces

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10241633A (en) * 1997-02-25 1998-09-11 Ushio Inc Dielectric barrier discharge lamp
JP2001006624A (en) * 1999-06-22 2001-01-12 Hitachi Ltd Electrodeless fluorescent lamp device
JP2001023578A (en) * 1999-07-05 2001-01-26 Ushio Inc Dielectric barrier discharge lamp
JP2001307682A (en) * 2000-04-20 2001-11-02 Ushio Inc Dielectrics-barrier discharge lamp
JP2002100324A (en) * 2000-09-25 2002-04-05 Toshiba Lighting & Technology Corp Dielectric barrier discharge lamp and dielectric barrier discharge lamp device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10241633A (en) * 1997-02-25 1998-09-11 Ushio Inc Dielectric barrier discharge lamp
JP2001006624A (en) * 1999-06-22 2001-01-12 Hitachi Ltd Electrodeless fluorescent lamp device
JP2001023578A (en) * 1999-07-05 2001-01-26 Ushio Inc Dielectric barrier discharge lamp
JP2001307682A (en) * 2000-04-20 2001-11-02 Ushio Inc Dielectrics-barrier discharge lamp
JP2002100324A (en) * 2000-09-25 2002-04-05 Toshiba Lighting & Technology Corp Dielectric barrier discharge lamp and dielectric barrier discharge lamp device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7745997B2 (en) * 2006-01-07 2010-06-29 Kwang Woon Display Technology Co., Ltd. Multi-electrodes double tube fluorescent lamp
WO2008096292A1 (en) * 2007-02-07 2008-08-14 Philips Intellectual Property & Standards Gmbh Dielectric barrier discharge lamp
DE102009030310A1 (en) * 2009-06-24 2010-12-30 Osram Gesellschaft mit beschränkter Haftung Dielectric barrier discharge lamp with discharge spaces
US8441189B2 (en) 2009-06-24 2013-05-14 Osram Gesellschaft Mit Beschrankter Haftung Dielectric barrier discharge lamp with discharge spaces

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