EP1320869A1 - Lampe a decharge avec modulation de champ capacitive - Google Patents

Lampe a decharge avec modulation de champ capacitive

Info

Publication number
EP1320869A1
EP1320869A1 EP01974014A EP01974014A EP1320869A1 EP 1320869 A1 EP1320869 A1 EP 1320869A1 EP 01974014 A EP01974014 A EP 01974014A EP 01974014 A EP01974014 A EP 01974014A EP 1320869 A1 EP1320869 A1 EP 1320869A1
Authority
EP
European Patent Office
Prior art keywords
discharge
discharge lamp
lamp according
electrodes
modulation
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
Application number
EP01974014A
Other languages
German (de)
English (en)
Other versions
EP1320869B1 (fr
Inventor
Lothar Hitzschke
Frank Vollkommer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Osram GmbH
Original Assignee
Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH filed Critical Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
Publication of EP1320869A1 publication Critical patent/EP1320869A1/fr
Application granted granted Critical
Publication of EP1320869B1 publication Critical patent/EP1320869B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • 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 present invention relates to a so-called silent discharge lamp, also called a dielectric barrier discharge lamp, which is designed for dielectrically impeded discharges.
  • a discharge lamp includes a discharge vessel which contains the discharge medium, in which discharges are ignited and maintained via electrodes.
  • Silent discharge lamps are operated with dielectrically impeded discharges, at least some of the electrodes being separated from the discharge medium by a dielectric layer. If the electrodes are specifically designed as cathodes and anodes, that is to say are intended for operation with a uniform polarity, then at least the anodes must be separated from the discharge medium by this dielectric layer. In bipolar operation, all electrodes must be separated from the discharge medium by a dielectric layer.
  • a wall of the discharge vessel can also be considered as such a dielectric layer.
  • the discharge medium generally consists of a gas mixture ur d-usually contains noble gases, for example Xe.
  • US 6252352 B1 forms a more specific state of the art, which is of interest for the present application.
  • This document describes silent discharge lamps with strip-shaped electrodes, on which nicks are provided at certain intervals in order to define preferred locations for individual discharge structures. This is to avoid uncontrolled wandering or extinction and recurrence of such discharge structures and to systematically order the local distribution of the discharge structures in the discharge space.
  • the cited prior art is concerned in particular with increasing the homogeneity of the luminance distribution in so-called flat spotlights, that is to say flat-shaped silent discharge lamps, which are of particular interest for backlighting displays of various types. Reference is also made to the still older US-A 6 060828.
  • Such individual discharge structures occur in silent discharge lamps in particular when the pulsed mode of operation explained in W094 / 23442 is used, with ⁇ -shaped individual discharges being produced. Depending on the operating parameters, such discharges can also occur in a broadened manner and even form continuous “curtains”, in individual cases also be divided into themselves and the like. This is a question of the electrode design and the various operating parameters of the discharge lamp. These details are of no importance for the present invention
  • the invention is also directed to silent discharge lamps, in which, under circumstances other than those described in the WO document mentioned, possibly stable and localizable Form discharge structures. The invention is therefore not restricted to the teaching of the WO document.
  • the invention is based on the technical problem of specifying a silent discharge lamp of the general type described at the outset, in which the local distribution of individual discharge structures in the discharge space can be influenced.
  • the invention is directed to such silent discharge lamps which are extended in at least one direction, which is referred to below as the longitudinal direction.
  • the extension can of course also be present in a second direction, that is to say it is flat.
  • the invention is defined as a discharge lamp for dielectrically impeded discharges with a discharge vessel filled with a discharge medium and discharge electrodes which are at least partially separated from the discharge medium by a dielectric layer, the discharge vessel being extended at least along a longitudinal direction, characterized by an electrically conductive one and means electrically isolated from the electrodes, which are capacitively coupled to at least one of the electrodes, the conductive device being designed, through the capacitive coupling to the electrode, to define the equipotential lines along the longitudinal direction defined by the electric field between the electrodes to modulate.
  • This invention is based on the finding that the distribution of
  • Discharge structures in the discharge space cannot only be achieved by an inhomogeneous configuration of the electrodes themselves. Rather, according to the invention, a device for capacitively influencing the field Distribution proposed in the discharge space, which is galvanically isolated from the electrodes (in the DC sense).
  • the electrodes can therefore have a completely uniform shape, for example straight strips (but they are not restricted to uniform configurations). Since the operating frequencies of dielectrically impeded discharges are in any case relatively high, a capacitive coupling of the device according to the invention can influence the field distribution in terms of AC.
  • the device according to the invention for capacitive influencing forms taps with respect to the current in relation to the electrode or electrodes or the discharge space.
  • the capacitive device distorts the equipotential lines in the discharge space.
  • this is preferably done in a manner that oscillates along the extension of the discharge lamp in the longitudinal direction.
  • oscillating is used to describe the fact that the equipotential lines are, so to speak, distorted in an "up and down” or “back and forth” sense. This oscillating distortion can, but need not, be periodic. However, periodic modulation of the equipotential lines forms a preferred case.
  • the individual discharge structures are arranged depending on the field distribution.
  • the distortion of the equipotential lines provides preferred places according to the invention for discharge structures, with which a specific arrangement of the discharge structures can be ensured in the desired manner.
  • the capacitive device thus forms an alternative to the structuring of the electrodes themselves, which is described in the prior art described.
  • the invention may thus be of interest, for example, in order to avoid electrode structuring, for example because Simplify the manufacturing process or offer homogeneous, continuous electrodes due to poor access to the spaces provided for the electrodes. Otherwise, the capacitive device according to the invention, which must consist of electrically conductive material, does not require any significant technical outlay and can in particular also be attached outside the discharge vessel, it does not even have to touch it.
  • the invention it is therefore possible to dispense with a special structuring of the electrodes for producing preferred locations for discharge structures.
  • Such structuring is not excluded.
  • such structuring can be corrected, supplemented or, if desired, compensated for by the measures according to the invention.
  • the modulation according to the invention can also be used for brightening the edges, for which purpose reference is made to the third, fourth and fifth exemplary embodiments. It is therefore not absolutely necessary for the modulation by the capacitive device to be adapted in a 1: 1 correspondence to the discharge structure distribution. However, it is preferred that the capacitive modulation is adapted to the intermediate distances between the discharge structures.
  • the capacitive modulation corresponds to multiples of the intermediate discharge distances, an intermediate subdivision being provided by other measures within these multiple distances.
  • the adaptation of the oscillation length scale to the intermediate distances is also to be understood in this sense.
  • a length range of at most 6 times, better 5 times, 4 times or even at most 3 times the discharge distance has been found to be the preferred range for this oscillation length scale.
  • the capacitive device can be provided two or more times to Preferred discharge locations from different sides of the discharge vessel from "embossing". Of course, one or more of the capacitive devices can influence the equipotential lines in the area of two or more electrodes. According to the invention, it is preferred that the capacitive device is provided at least twice in the sense of two parts and the devices or parts of the device detect both electrode polarities of the lamp, which is particularly advantageous in the case of bipolar discharge lamps because it is generally a good idea to provide the cathodes or the region of the cathodes with preferred places for discharges because the discharges are stronger there In bipolar operation, all electrodes act as cathodes in certain operating phases.
  • This modulation is preferably present over substantially the entire extent of the discharge lamp at least in one longitudinal direction and furthermore preferably periodically at least over this entire length.
  • the homogeneity of the luminance distribution which is generally essential in these discharge lamps, can be achieved.
  • the capacitive device is arranged outside the discharge vessel and the electrodes, that is to say at least the electrodes in the region of the capacitive device, are arranged inside the discharge vessel, the above-mentioned galvanic isolation is already given.
  • Insulation between the capacitive device and the electrodes can be provided outside the discharge vessel.
  • the capacitive device is preferably a discharge vessel holder or part of such.
  • the effect according to the invention is particularly pronounced when the capacitive device effects a capacitive coupling between the electrode coupled to it and an associated counter-electrode parts of the discharge space which are closer. Then there is an effect comparable to an effective electrode widening.
  • the capacitive device in the sense of the present application can bring about a certain temperature homogenization along the at least one longitudinal direction of the discharge lamp. This depends in detail on how good the thermal contact between the capacitive device and the discharge vessel is.
  • the structuring of the capacitive device required by the modulation of the field distribution does not necessarily stand in the way of this temperature homogenization, because this modulation is to be carried out using a length scale that is matched to the intermediate discharge distances.
  • the temperature inhomogeneities in the discharge lamp generally occur on a larger length scale; the discharge lamp is usually warmer in the middle than at the edge, with a steady course in between.
  • the thermal device defined in the cited application can also be combined with the present invention.
  • the thermal device according to the cited application and the capacitive device according to the present application can thus be provided simultaneously, in particular they can also be combined.
  • the thermal / capacitive device adapted to the intrinsic temperature behavior of the lamp, can have a thermally inhomogeneous effect, for example through differently pronounced thermal conductivity. If non-decisive properties are used for the capacitive effect, the field modulation can remain completely unaffected.
  • the material thickness or the material itself could be chosen so that the device cools more in the middle of the lamp than at the edge.
  • a thermally conductive connection to a cooling device and the like could be provided only in the middle.
  • inhomogeneously arranged cooling fins can also be used.
  • various design options for the thermal device reference is made to the cited prior notification, the disclosure content of which is included here. If the thermally inhomogeneous influencing of the lamp is carried out by means of insulation measures, in that the ends of the lamp, which tend to be too cold, are insulated, this can be done anyway regardless of the capacitive device.
  • the discharge lamp according to the invention is preferably provided with a ballast which is tailored to the pulsed operating method already mentioned. According to the current state of knowledge, this method can be used to generate localized discharge structures in a particularly efficient manner.
  • the invention finds particular application in the form of elongated discharge lamps.
  • these are a preferred application for the “thermal homogenization” explained, on the other hand, it can be difficult, particularly in the case of such discharge lamps, to attach structured electrodes, in particular if they are to be located within the discharge vessel.
  • electrodes within the discharge vessel are to be reduced The voltages required for starting and operation are often desired.
  • the invention offers an easily feasible way out, especially when the holder, which is necessary anyway, is designed in the manner according to the invention.
  • Such flashlights are of particular interest for copying devices or scanning devices in which a flashlight has to be guided over an optically scanned field, for example a paper surface.
  • the invention is also suitable for flat spotlights which, as mentioned, form an essential area of application for silent discharge lamps, in particular for backlighting display devices.
  • Figure 1 is a schematic view of a silent rod discharge lamp according to the invention as a first embodiment
  • Figure 2 shows a variant of Figure 1 as a second embodiment, in section along the longitudinal axis;
  • Figure 3 is a schematic view of a variant of Figure 2 as a third embodiment
  • Figure 4 is a schematic view of a further variant of Figure 3 as a fourth embodiment
  • Figure 5 is a schematic view of a silent rod discharge lamp according to the invention as a fifth embodiment.
  • Figure 1 illustrates the basic principle of the invention in a simple embodiment.
  • 1 designates a silent rod discharge lamp, which essentially consists of an elongated glass tube.
  • the details of the electrode structure are not shown here, but can be recognized to some extent in FIG. 2.
  • US-A 6 097155 The potential distribution within the discharge vessel, namely the glass tube, which is generated by the electrodes inside this rod discharge lamp 1, namely the glass tube, can be modulated by the metal sheet designated by 2.
  • This metal sheet has a cam-like structure which extends vertically in FIG. 1, the upper ends of the prongs 3 of this comb structure abutting the rod discharge lamp 1.
  • FIG. 2 shows that the tines 3 can also partially enclose the lamp 1. Otherwise, FIG. 2 shows in cross section the internal electrodes 4 of the rod discharge lamp.
  • the tines 3 couple to the interior of the discharge vessel of the rod discharge lamp 1.
  • This is a purely capacitive effect, in which there is a complete galvanic separation between the electrodes 4 and the prongs 3 or between the interior of the discharge vessel and the prongs 3.
  • the sheet 2 is structured as a capacitive device in the sense of the invention, this results in a modulation of the equipotential lines which run essentially undisturbed along the longitudinal extent of the rod discharge lamp 1 as a result of the homogeneously strip-shaped design of the electrode strips 4.
  • the comb structure of the sheet 2 of the field distribution within the rod discharge lamp 1 thus imparts a structure with the same oscillation length, in this example there being a periodic oscillation practically over the entire length of the rod discharge lamp 1.
  • the discharge structures are distributed within the rod discharge lamp 1. They are preferably located at the points of the tines 3 within the discharge vessel. In the second exemplary embodiment in FIG. 2, this effect occurs more than in the first exemplary embodiment in FIG. 1 in that the prongs 3 around the rod discharge lamp 1 each approximately are led around a quarter circle. This modulation can also be seen as an effective electrode widening.
  • Figure 1 shows that the sheet 2 is mounted only in a central area in the longitudinal extension of the rod discharge lamp 1 via a wider sheet metal part 5 and two screws.
  • the assembly can also be carried out on a heat sink, as a result of which the sheet metal 2 as a whole acts as a cooling device. If the tines 3 are made somewhat wider than drawn and have a relatively good thermal contact with the rod discharge lamp 1, for example by abutting them over part of the cross-sectional circumference as shown in FIG. 2, the sheet metal 2 forms an inhomogeneous cooling device in the sense of the already mentioned previous invention without the capacitive coupling being inhomogeneous in the same way.
  • FIG. 3 shows, very schematically, an alternative arrangement of tines of a comb structure which is otherwise comparable, the tines here being designated by 6.
  • the tines are arranged more densely in an edge region of the rod discharge lamp 1 on the left in FIG. 3 than in a central region shown on the right in FIG. 3, which also results in a denser arrangement of discharge structures in the rod discharge lamp 1.
  • Such brightening of the edge can be useful for various reasons, in particular it can be selected to compensate for an otherwise occurring darkening of the edge, that is to say basically only to homogenize the luminance distribution.
  • For the brightening of the edges reference is also made to the already cited US 6 252 352 B1
  • FIG. 4 shows with the tines 7 shown there a variant of Figure 3 as a fourth embodiment.
  • the tines 7 are not arranged more densely in the edge region of the rod discharge lamp to be seen on the left, but they are made wider.
  • the discharge structures burn brighter in the edge region than in the central region of the rod discharge lamp 1 on the right in FIG. 4.
  • the heterogeneity of the tine structure 6 and 7 is somewhat exaggerated towards the edge. In a practical embodiment, the heterogeneity will generally only be so pronounced that overall a homogeneous luminance distribution is achieved.
  • FIG. 5 shows the fifth embodiment, also in a highly schematic representation.
  • 1 again designates the rod discharge lamp which has already been explained.
  • a metal strip designated 8 which is made relatively wide in the left and right outer area and relatively narrow in the middle area, with continuous transitions between them.
  • the electrode strips within the rod discharge lamp 1 are not structured, but that a continuous curtain-like discharge burns due to the high lamp power. (However, the electrode strips can also be structured, as is already known from the prior art.)
  • the present invention merely has the task of providing the edge brightening which has already been explained.
  • the capacitive device 8 modulates the field lines over substantially the entire length of the rod discharge lamp 1, but independently of intermediate discharge distances. This modulation could also only be present in the marginal area.
  • the modulation according to the invention should be present at least in the edge region of the longitudinal extent of the silent discharge lamp or over substantially its entire length in the longitudinal direction.
  • This modulation is oscillating in the sense that it is a "back-and-forth” or “up-and-down shift” with an intermediate maximum or nimum corresponds. This would also apply if the central area of the metal strip 8 were missing.
  • the fifth exemplary embodiment from FIG. 5 could also be combined with the first or second exemplary embodiment, so that a structuring of the electrode strips 4 itself can be dispensed with.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Electromagnetism (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Discharge Lamp (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)
  • Discharge Lamps And Accessories Thereof (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)

Abstract

L'invention concerne la modulation capacitive de la répartition de champ dans une lampe à décharge (1) silencieuse, au moyen d'un dispositif (2) structuré, électroconducteur, pour la définition d'emplacements préférentiels de structures à décharge dans la lampe (1).
EP01974014A 2000-09-29 2001-09-05 Lampe a decharge avec modulation de champ capacitive Expired - Lifetime EP1320869B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10048409A DE10048409A1 (de) 2000-09-29 2000-09-29 Entladungslampe mit kapazitiver Feldmodulation
DE10048409 2000-09-29
PCT/DE2001/003406 WO2002027760A1 (fr) 2000-09-29 2001-09-05 Lampe a decharge avec modulation de champ capacitive

Publications (2)

Publication Number Publication Date
EP1320869A1 true EP1320869A1 (fr) 2003-06-25
EP1320869B1 EP1320869B1 (fr) 2005-04-20

Family

ID=7658165

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01974014A Expired - Lifetime EP1320869B1 (fr) 2000-09-29 2001-09-05 Lampe a decharge avec modulation de champ capacitive

Country Status (10)

Country Link
US (1) US6897611B2 (fr)
EP (1) EP1320869B1 (fr)
JP (1) JP2004510308A (fr)
KR (1) KR100863363B1 (fr)
CN (1) CN1222013C (fr)
AT (1) ATE293842T1 (fr)
CA (1) CA2392843A1 (fr)
DE (2) DE10048409A1 (fr)
TW (1) TW550623B (fr)
WO (1) WO2002027760A1 (fr)

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Also Published As

Publication number Publication date
DE10048409A1 (de) 2002-04-11
DE50105972D1 (de) 2005-05-25
ATE293842T1 (de) 2005-05-15
WO2002027760A1 (fr) 2002-04-04
JP2004510308A (ja) 2004-04-02
CN1222013C (zh) 2005-10-05
US20020163305A1 (en) 2002-11-07
KR20020053822A (ko) 2002-07-05
CN1386297A (zh) 2002-12-18
US6897611B2 (en) 2005-05-24
CA2392843A1 (fr) 2002-04-04
TW550623B (en) 2003-09-01
EP1320869B1 (fr) 2005-04-20
KR100863363B1 (ko) 2008-10-13

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