EP0922297A1 - Fluorescent lamp - Google Patents
Fluorescent lampInfo
- Publication number
- EP0922297A1 EP0922297A1 EP98931925A EP98931925A EP0922297A1 EP 0922297 A1 EP0922297 A1 EP 0922297A1 EP 98931925 A EP98931925 A EP 98931925A EP 98931925 A EP98931925 A EP 98931925A EP 0922297 A1 EP0922297 A1 EP 0922297A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fluorescent lamp
- wall
- discharge vessel
- electrode
- electrodes
- 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.)
- Granted
Links
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 18
- 239000004020 conductor Substances 0.000 claims description 15
- 229910000679 solder Inorganic materials 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 6
- 229910052756 noble gas Inorganic materials 0.000 claims description 5
- 229910052724 xenon Inorganic materials 0.000 claims description 5
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 claims description 5
- 239000012811 non-conductive material Substances 0.000 claims 2
- 239000007789 gas Substances 0.000 abstract description 3
- 239000011261 inert gas Substances 0.000 abstract description 3
- 239000000463 material Substances 0.000 abstract description 3
- 238000005476 soldering Methods 0.000 abstract 2
- 239000010410 layer Substances 0.000 description 32
- 230000008901 benefit Effects 0.000 description 4
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 3
- 239000011241 protective layer Substances 0.000 description 3
- 229910052709 silver Inorganic materials 0.000 description 3
- 239000004332 silver Substances 0.000 description 3
- 230000001419 dependent effect Effects 0.000 description 2
- 238000005286 illumination Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 229910052684 Cerium Inorganic materials 0.000 description 1
- 208000034656 Contusions Diseases 0.000 description 1
- 229910052688 Gadolinium Inorganic materials 0.000 description 1
- 229910052771 Terbium Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005670 electromagnetic radiation Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
Classifications
-
- 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
-
- 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
- H01J61/76—Lamps with low-pressure unconstricted discharge having a cold pressure < 400 Torr having a filling of permanent gas or gases only
- H01J61/78—Lamps with low-pressure unconstricted discharge having a cold pressure < 400 Torr having a filling of permanent gas or gases only with cold cathode; with cathode heated only by discharge, e.g. high-tension lamp for advertising
-
- 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
- H01J61/80—Lamps suitable only for intermittent operation, e.g. flash lamp
-
- 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
- H01J61/06—Main electrodes
- H01J61/067—Main electrodes for low-pressure discharge lamps
- H01J61/0672—Main electrodes for low-pressure discharge lamps characterised by the construction of the electrode
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/02—Details
- H01J61/36—Seals between parts of vessels; Seals for leading-in conductors; Leading-in conductors
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S315/00—Electric lamp and discharge devices: systems
- Y10S315/01—Fluorescent lamp circuits with more than two principle electrodes
Definitions
- the invention is based on a fluorescent lamp according to the preamble of claim 1.
- the invention also relates to a lighting system according to the preamble of claim 17 with this fluorescent lamp.
- dielectric electrodes are also referred to in the following as "dielectric electrodes”.
- the dielectric layer can be formed by the wall of the discharge vessel itself, in that the electrodes are arranged outside the discharge vessel, for example on the outer wall.
- An advantage of this design with external electrodes is that no gastight current feedthroughs have to be passed through the wall of the discharge vessel.
- the thickness of the dielectric layer - an important parameter that influences, among other things, the ignition voltage and the operating voltage of the discharge - is essentially determined by the requirements placed on the discharge vessel, in particular its mechanical strength. Since the level of the required supply voltage increases with the thickness of the dielectric layer, there are the following disadvantages, among others.
- the voltage provided for the operation of the flat radiator power supply can be designed for the higher voltage requirements. This is usually associated with additional costs and larger external dimensions. In addition, higher safety precautions for protection against accidental contact are required. Finally, undesirably high electromagnetic radiation can become problematic.
- the dielectric layer can also be implemented in the form of an at least partial covering or layer of at least one electrode arranged within the discharge vessel.
- This has the advantage that the thickness of the dielectric layer can be optimized for the discharge properties.
- inner electrodes require gas-tight leadthroughs. As a result, additional manufacturing steps are required, which generally makes the manufacturing more expensive.
- fluorescent lamps with a tubular discharge vessel which is closed on both sides and whose inner wall is at least partially coated with a fluorescent substance.
- OA Office Automation
- Color copiers and scanners for signal lighting, e.g. as brake and direction indicator lights in automobiles
- auxiliary lighting e.g. the interior lighting of automobiles
- displays e.g. Liquid crystal displays, used as so-called "edge type backlights”.
- these lamps do not contain mercury. Rather, these lamps are usually filled with noble gas, preferably xenon, or noble gas mixtures. Both high luminance and uniform luminance over the length of the lamp are necessary for the applications mentioned.
- the lamps for OA use are usually provided with an aperture along the longitudinal axis. In order to further increase the luminance, it is not sufficient to increase the power coupled into previous systems, since the load on a lamp cannot be increased arbitrarily for permanent and reliable operation. To make matters worse, in the systems previously used in copiers and scanners, the efficiency of the discharge decreases with increasing power coupling.
- a noble gas discharge lamp for OA devices is already known from US 5,117,160.
- Two strip-shaped electrodes are arranged along the longitudinal axis of the lamp on the outer surface of the wall of a tubular discharge vessel.
- the lamp is operated with AC voltage at a preferred frequency between 20 kHz and 100 kHz.
- the 147 nm xenon line is excited during operation.
- the disadvantage is a protective layer that is not completely transparent, which is necessary, inter alia, for protection against contact, and which covers both the electrode strips and the rest of the lamp surface. Without this protective layer, the electrodes, which are alternately at high voltage potential (eg approx. 1600 V), would be freely accessible.
- the protective layer also has the function of preventing parasitic surface discharge.
- US Pat. No. 5,604,410 discloses a tubular discharge lamp with a circular cross section, with a strip-shaped outer electrode and a rod-shaped inner electrode.
- the rod-shaped inner electrode is arranged eccentrically in the vicinity of the inner wall and parallel to the longitudinal axis of the discharge vessel with the aid of two bow-shaped current leads.
- the two power supply lines each lead to the outside via a pinch, which is connected to the discharge vessel in a gas-tight manner by means of melting the plate.
- the outer electrode is fixed diametrically opposite on the outer wall. Disadvantages are the relatively complex and consequently expensive construction for fastening the metallic electrode rod in the interior of the lamp and the two bruises.
- the metallic inner electrode rod must be made relatively thick to ensure the necessary rigidity.
- the basic idea of the invention is based on the knowledge that on the one hand the impact distance of the pulsed, dielectrically impeded discharge should be as large as possible for high electrical power coupling. On the other hand, the arrangement of all electrodes on the outer wall of the discharge vessel and the associated disadvantages are to be avoided. In addition, for the pulsed, dielectrically impeded discharge, the striking distance along the discharge tube should be as constant as possible. This is important in order to ensure the same ignition conditions for all individual discharges during operation (see US Pat. No. 5,604,410) along the electrodes.
- a first way according to the invention to solve this problem proposes to arrange at least one or even all of the electrodes on the inner wall of the discharge vessel.
- such an electrode is abbreviated also referred to as “inner wall electrode”.
- this concept can be used up to a maximum of the entire inner diameter as a striking distance.
- One advantage is the good thermal coupling of the This ensures that the inner wall electrodes do not detach from the inner wall even in continuous operation.
- the inner wall electrode is designed as an electrically conductive, possibly "line-like" strip - similar to an electrical conductor track - and oriented parallel to the longitudinal axis of the tubular discharge vessel.
- the strip can be applied to the inner wall in the form of liquid conductive silver or the like.
- the strip is then applied
- the inner wall electrode is also further developed as a lead-through including an external power supply.
- the tubular discharge vessel is closed at least at one of its two ends with a plug which is connected gas-tight to the inner wall of the end of the vessel by means of solder, for example glass solder.
- the inner wall electrode is guided gas-tight to the outside through the solder, ie the inner wall electrode merges into a bushing in the area of the solder and finally into an external power supply outside of the vessel
- the electrode, its associated bushing and associated external power supply are each designed as functionally different sub-areas of a single, common, conductor-track-like structure. This structure represents a key to the realization of the inner wall electrode. This concept can be simply implemented Realize wisely and with relatively few components and is also easy to automate.
- the materials for glass solder and discharge vessel are matched to one another.
- the thickness of the conductor track is chosen to be so thin that on the one hand the thermal stresses remain low and on the other hand the current strengths required during operation can be achieved.
- a sufficiently high current carrying capacity of the conductor track is of particular importance insofar as the high luminous intensities sought for such lamps ultimately result in high current intensities. This problem is exacerbated again in the preferred pulsed operating mode of the discharge, since particularly high currents flow in the conductor tracks during the relatively short duration of the repetitive active power coupling. Only in this way is it possible to couple in sufficiently high average active powers and thereby achieve the desired high light intensity on average.
- a relatively thick conductor track is used for the at least one inner wall electrode. If the conductor track thickness is too small, it risks creating cracks due to local overheating of the conductor track. The heating of the conductor track by the ohmic portion of the conductor track current is higher, the smaller the cross section of the conductor track.
- the width of the conductor tracks for reasons of space, particularly in the case of very slim lamps with relatively small diameters. Therefore, rather narrow, but rather thick conductor tracks are sought in order to solve the problem of cracking due to heat development due to high current densities to solve the conductor tracks.
- Typical thicknesses for conductive silver strips are in the range from approximately 5 ⁇ m to approximately 50 ⁇ m, preferably in the range from approximately 5.5 ⁇ m to approximately 30 ⁇ m, particularly preferably in the range from approximately 6 ⁇ m to approximately 15 ⁇ m.
- one or more further electrodes are arranged on the outer wall or also on the inner wall.
- at least part of the inner wall has a phosphor layer.
- one or more reflection layers for visible light for example made of A1 2 0 3 and / or Ti0 2 , can be applied below the phosphor layer. This may prevent some of the light emitted by the phosphor layer from being transmitted through the vessel wall. Rather, the light is essentially directed onto the aperture by reflection or multiple reflection, and consequently the luminance is increased there.
- the phosphor layer itself can also additionally be used as a reflection layer by applying the phosphor layer with a sufficient thickness.
- the fluorescent lamp has two electrodes, one strip-shaped electrode being arranged on each of the outer and inner walls. If the lamp is intended for operation with bipolar voltage pulses, the inner wall electrode is additionally completely covered with a dielectric layer. This double-sided dielectric interference is not absolutely necessary for operation with unipolar voltage pulses (see US Pat. No. 5,604,410). In the latter case, the inner wall electrode is connected to high-voltage potential in order to ensure safe contact.
- both electrodes are arranged on the inner wall of the discharge vessel, at least one of the two electrodes being completely covered with a dielectric layer. Should the lamp go with bipolar voltage pulses are operated, both electrodes are correspondingly dielectric coated.
- the lamp has three or more electrodes. With three electrodes, two discharge planes can be created that have a common electrode. In the case of unipolar voltage pulses, this is preferably the (temporary) cathode and the other two electrodes are connected as anodes.
- the electrodes are advantageously oriented such that, viewed in cross section, the perpendicular bisectors of the respective discharge planes intersect the phosphor layer. This ensures that the UV (ultraviolet) emission maximum of the discharge level falls on the phosphor layer.
- a second way according to the invention for solving the above-mentioned problem proposes at least one electrode within the wall of the Arrange discharge vessel.
- such an electrode is also abbreviated as "vessel wall electrode”.
- the associated counter-electrode (s) up to a maximum of the entire inner diameter can be used as the striking distance.
- the advantage of this solution is that Operation with bipolar voltage pulses does not require an additional dielectric, since the dielectric layer which is effective for the discharge is formed here by a part of the vessel wall itself, namely by the part of the wall which covers the electrode in the direction toward the inside of the discharge vessel -
- the dielectric layer is determined here by the depth at which the electrode is embedded in the vessel wall, which is why it is also necessary to insert the electrode very uniformly into the vessel wall, for example in the form of a straight wire make sure that the thickness of the covering of the electrode by the vessel ßmaterial (dielectric!) is as constant as possible over the pipe length.
- the fluorescent lamp according to the second solution basically has the same features as the fluorescent lamp according to the first solution.
- both solutions can also be combined, ie at least one electrode is arranged both on the inner wall and inside the vessel wall. Furthermore, one or more electrodes can also be arranged on the outer wall of the discharge vessel in this case.
- the tubular discharge vessel can also be curved. Since the discharge direction is essentially perpendicular to the longitudinal axis of the lamp, almost any shape can be realized, in particular also circular, without the discharge being adversely affected.
- a gas filling consisting of an inert gas, in particular xenon, or an inert gas mixture.
- La shows a longitudinal section through a fluorescent lamp according to the invention with aperture and with an outer and an inner wall electrode
- FIG. 1b shows a cross section through the fluorescent lamp from FIG.
- FIG. 2 shows a cross section through a fluorescent lamp with two inner wall electrodes
- FIG. 3 shows a cross section through a fluorescent lamp with an inner wall and two outer wall electrodes
- FIG. 4 shows a cross section through a fluorescent lamp with four inner wall electrodes
- FIG. 5 shows a cross section through a fluorescent lamp with a vessel wall and two outer wall electrodes
- FIGS la and lb show the longitudinal or cross section of an aperture fluorescent lamp 1 for OA applications in a schematic representation.
- the lamp 1 essentially consists of a tubular discharge vessel 2 with a circular cross section and a first and a second strip-shaped electrode 3, 4. With the exception of a rectangular aperture 5, the inner wall of the discharge vessel 2 has a phosphor layer 6.
- the discharge vessel 2 is sealed gas-tight at its first end with a dome 7 formed from the vessel and at its second end with a plug 8.
- the plug 8 is gas-tightly connected to the inner wall of the vessel end by means of glass solder 9.
- Xenon with a filling pressure of 160 torr is located within the discharge vessel 2.
- the first electrode 3, which is provided as an anode, is designed as a metal foil strip which is arranged on the outer wall of the discharge vessel 2 parallel to the longitudinal axis of the tube.
- the other electrode 4, which is provided as a cathode, consists of a conductive silver strip arranged diametrically to the anode, which was applied in the liquid state with the aid of a cannula to the inner wall of the discharge vessel 2 and then baked (inner wall electrode).
- the layer thickness is approx. 10 ⁇ m.
- the cathode 4 is guided in a gas-tight manner to the outside in a lead-through area 10 between the stopper 8 and the inner wall of the second end of the discharge vessel 2, where it merges into an external power supply 11.
- the cathode 4, its associated bushing 10 and the associated external power supply 11 are each designed as functionally different partial areas of a single common, conductor track-like structure.
- the glass solder 9 enables the gas-tight passage of the cathode 4 in this passage area 10.
- the respective width of the anode and cathode strips is 0.9 mm and 0.8 mm.
- the outer diameter of the tubular discharge vessel 2 made of glass is approximately 9 mm with a wall thickness of approximately 0.5 mm.
- the width and length of aperture 5 are approximately 6.5 mm and 255 mm, respectively.
- the phosphor layer 6 is a three-band phosphor.
- FIGS. 2 to 5 schematically show further cross sections of a fluorescent lamp according to the invention, similar to the lamp shown in FIG. 1 a, with and without an aperture. They differ from one another essentially in the electrode configuration. The same features are designated with the same reference numerals.
- the lamp in FIG. 2 has a first and a second inner wall electrode 12, 4. Since both electrodes are located within the discharge vessel 2, the first electrode 12 is covered with a dielectric layer 13 (discharge that is dielectrically impeded on one side). This is provided as an anode in unipolar pulsed operation according to US Pat. No. 5,604,410.
- the lamp in FIG. 3 has two outer wall electrodes 3a, 3b and one inner wall electrode 4.
- the outer wall electrodes 3a, 3b are provided as anodes and the inner wall electrode 4 is provided as a cathode. Consequently, in the pulsed operation according to US Pat. No. 5,604,410, two levels are formed with single discharges which are dielectrically impeded on one side (not shown).
- a first discharge plane extends between the cathode strip 4 and the first anode strip 3a.
- the other discharge plane extends between the cathode strip 4 and the second anode strip 3b.
- the electrodes 3a, 3b, 4 are viewed in cross section arranged at the corner points of an imaginary isosceles triangle.
- the lamp in FIG. 4 has four inner wall electrodes 14a-14d. Each of the inner wall electrodes 14a-14d is covered with a dielectric layer 15a-15d. A first 14a of the four electrodes 14a-14d is provided for a first polarity of a supply voltage, while the three other electrodes 14b-14d are provided for the second polarity. In pulsed operation, a total of three discharge levels are formed, namely between the first electrode 14a and one of the three remaining electrodes 14b-14d. Since the discharge is dielectrically impeded on both sides, operation is not only possible with unipolar voltage pulses but also with bipolar voltage pulses.
- the inner wall of the discharge vessel 2 is provided with the exception of the aperture 5 with a reflection double layer 16 made of Al 2 O ⁇ and Ti0 2 .
- a phosphor layer 6 is applied to the reflection double layer 16.
- the reflection double layer 16 reflects the light generated by the phosphor layer 6. In this way, the luminance of the aperture 5 is increased.
- the lamp in FIG. 5 has two outer wall electrodes 3a, 3b and a vessel wall electrode 4.
- the vessel wall electrode 4 consists of a wire made of Vacovit® (from Vacuumschmelze GmbH) with a diameter of approx. 100 ⁇ m, which is melted into the vessel wall. Since here, as in FIG. 4, all electrodes are dielectrically impeded, bipolar pulse operation is possible in addition to unipolar.
- the inner wall of the discharge vessel 2 is provided with a phosphor layer 17 over the entire circumference, ie, in contrast to the previous lamps, it has no aperture.
- the lamp from FIG. 5 is intended for automotive lighting, depending on the fluorescent material, for example as a brake light or flashing light.
- FIG. 6 shows a lighting system for OA devices.
- the aperture fluorescent lamp 1 from FIG. 1 additionally has a base 18 at its second end.
- the base 18 consists essentially of a base pot 19 and two connecting pins 20a, 20b.
- the base pot 19 serves primarily to accommodate the lamp 1.
- the outer wall electrode 3 and the inner wall electrode 4 or the outer power supply section 11 are connected to the two connecting pins 20a, 20b (not shown) in the inside of the base pot 19.
- the connection pins 20a, 20b are in turn connected to the two poles 22a and 22b of a pulse voltage source 23 via electrical lines 21a, 21b.
- the pulse voltage source 23 supplies a sequence of unipolar voltage pulses with a repetition frequency of 66 kHz.
- the pulse duration is approx.1.1 ⁇ s each.
- FIG. 7 shows the luminance L in cd / m 2 measured by the aperture as a function of the time-averaged electrical power P in W.
- the measurement curve 24 relates to an illumination system according to FIG. 6 with the operating parameters specified there. As can be seen, approximately 40,000 cd / m 2 are achieved with a power of almost 20 W.
- a comparable conventional lamp according to the teaching of US Pat. No. 5,117,160 delivers only 20,000 cd / m 2 with the same electrical power. The lamp according to the invention consequently produces twice the luminance with the same electrical power; this corresponds to a 100% increase over the prior art.
- the measurement curve 25 is obtained by replacing the lamp according to FIG. 1 with the lamp according to FIG. 3, ie a lamp with two instead of only one anode strips. Two discharge levels thus arise during operation (see also description of FIG. 3).
- an electrical power of approx. 10 W even higher luminance levels than with the measurement curve 24 achieved.
- a power of 20 W just under 50,000 cd / m 2 can be achieved. This corresponds to 2.5 times the luminance compared to the state of the art or an increase of 150%.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Vessels And Coating Films For Discharge Lamps (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19718395 | 1997-04-30 | ||
DE19718395A DE19718395C1 (en) | 1997-04-30 | 1997-04-30 | Fluorescent lamp and method of operating it |
PCT/DE1998/001061 WO1998049712A1 (en) | 1997-04-30 | 1998-04-16 | Fluorescent lamp |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0922297A1 true EP0922297A1 (en) | 1999-06-16 |
EP0922297B1 EP0922297B1 (en) | 2002-03-06 |
Family
ID=7828304
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98931925A Expired - Lifetime EP0922297B1 (en) | 1997-04-30 | 1998-04-16 | Fluorescent lamp |
Country Status (12)
Country | Link |
---|---|
US (1) | US6097155A (en) |
EP (1) | EP0922297B1 (en) |
JP (1) | JP2000513872A (en) |
KR (1) | KR100375616B1 (en) |
CN (1) | CN1165959C (en) |
AT (1) | ATE214201T1 (en) |
CA (1) | CA2259365C (en) |
DE (2) | DE19718395C1 (en) |
ES (1) | ES2174454T3 (en) |
HU (1) | HUP0100194A3 (en) |
TW (1) | TW419704B (en) |
WO (1) | WO1998049712A1 (en) |
Families Citing this family (30)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19905219A1 (en) | 1998-09-30 | 2000-08-31 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Flat lighting device |
JP3674695B2 (en) * | 1999-06-07 | 2005-07-20 | 東芝ライテック株式会社 | Discharge lamp, discharge lamp device |
DE19933405A1 (en) * | 1999-07-21 | 2001-03-29 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Elongated light source |
DE19936865A1 (en) | 1999-08-05 | 2001-02-15 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Gas discharge lamp and associated manufacturing process |
DE19951873A1 (en) * | 1999-10-28 | 2001-05-03 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Discharge lamp |
DE10014407A1 (en) * | 2000-03-24 | 2001-09-27 | Philips Corp Intellectual Pty | Low pressure gas discharge lamp |
DE10026913A1 (en) * | 2000-05-31 | 2001-12-06 | Philips Corp Intellectual Pty | Gas discharge lamp with fluorescent layer |
DE10048986A1 (en) * | 2000-09-27 | 2002-04-11 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Dielectric barrier discharge lamp |
DE10048410A1 (en) * | 2000-09-29 | 2002-04-11 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Dielectric barrier discharge lamp |
DE10048409A1 (en) * | 2000-09-29 | 2002-04-11 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Discharge lamp with capacitive field modulation |
DE10133326A1 (en) | 2001-07-10 | 2003-01-23 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Dielectric barrier discharge lamp with ignition aid |
DE10140355A1 (en) * | 2001-08-17 | 2003-02-27 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Discharge lamp with ignition aid |
DE10140356A1 (en) * | 2001-08-17 | 2003-02-27 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Tubular discharge lamp with ignition aid |
DE10147961A1 (en) * | 2001-09-28 | 2003-04-10 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Igniting, operating dielectric barrier discharge lamp involves applying ignition voltage between sub-electrodes to ignite auxiliary discharge at gap between sub-electrodes during ignition |
US6946794B2 (en) * | 2001-11-22 | 2005-09-20 | Matsushita Electric Industrial Co., Ltd. | Light source device and image reader |
KR20030044481A (en) * | 2001-11-30 | 2003-06-09 | 삼성전자주식회사 | Cold cathode fluorescent tube type lamp and liquid crystal display device using the same |
EP1329944A3 (en) * | 2001-12-14 | 2009-11-04 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Dielectric barrier discharge lamp with starting aid |
EP1328007A1 (en) | 2001-12-14 | 2003-07-16 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Dielectric barrier discharge lamp with starting aid. |
KR100846462B1 (en) * | 2002-05-23 | 2008-07-17 | 삼성전자주식회사 | Fluorescent lamp for backlight |
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- 1998-04-16 HU HU0100194A patent/HUP0100194A3/en unknown
- 1998-04-16 CN CNB988005638A patent/CN1165959C/en not_active Expired - Fee Related
- 1998-04-16 JP JP10546478A patent/JP2000513872A/en active Pending
- 1998-04-16 AT AT98931925T patent/ATE214201T1/en not_active IP Right Cessation
- 1998-04-16 EP EP98931925A patent/EP0922297B1/en not_active Expired - Lifetime
- 1998-04-16 WO PCT/DE1998/001061 patent/WO1998049712A1/en active IP Right Grant
- 1998-04-16 DE DE59803262T patent/DE59803262D1/en not_active Expired - Lifetime
- 1998-04-16 ES ES98931925T patent/ES2174454T3/en not_active Expired - Lifetime
- 1998-04-16 KR KR10-1998-0710844A patent/KR100375616B1/en not_active IP Right Cessation
- 1998-04-16 CA CA002259365A patent/CA2259365C/en not_active Expired - Fee Related
- 1998-04-16 US US09/202,616 patent/US6097155A/en not_active Expired - Lifetime
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Also Published As
Publication number | Publication date |
---|---|
DE19718395C1 (en) | 1998-10-29 |
TW419704B (en) | 2001-01-21 |
HUP0100194A3 (en) | 2001-06-28 |
KR20000022412A (en) | 2000-04-25 |
WO1998049712A1 (en) | 1998-11-05 |
JP2000513872A (en) | 2000-10-17 |
CA2259365C (en) | 2007-01-09 |
CA2259365A1 (en) | 1998-11-05 |
ES2174454T3 (en) | 2002-11-01 |
EP0922297B1 (en) | 2002-03-06 |
CN1165959C (en) | 2004-09-08 |
CN1225748A (en) | 1999-08-11 |
HUP0100194A2 (en) | 2001-05-28 |
KR100375616B1 (en) | 2003-04-18 |
ATE214201T1 (en) | 2002-03-15 |
DE59803262D1 (en) | 2002-04-11 |
US6097155A (en) | 2000-08-01 |
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