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
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
  • A61L2/00—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor
  • A61L2/02—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor using physical phenomena
  • A61L2/08—Radiation
  • A61L2/10—Ultraviolet radiation
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
  • A61L9/00—Disinfection, sterilisation or deodorisation of air
  • A61L9/16—Disinfection, sterilisation or deodorisation of air using physical phenomena
  • A61L9/18—Radiation
  • A61L9/20—Ultraviolet radiation
  • A61L9/205—Ultraviolet radiation using a photocatalyst or photosensitiser
• • 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
• • 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
  • H01J61/305—Flat vessels or containers
• • 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
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
  • A61N5/00—Radiation therapy
  • A61N5/06—Radiation therapy using light
  • A61N5/0613—Apparatus adapted for a specific treatment
  • A61N5/0614—Tanning
• • C—CHEMISTRY; METALLURGY
  • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F1/00—Treatment of water, waste water, or sewage
  • C02F1/30—Treatment of water, waste water, or sewage by irradiation
  • C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light

Definitions

• the present invention relates to the field of ultraviolet (or UV) flat lamps and in particular relates to flat UV co-planar discharge lamps and to the uses of such lamps.
• Conventional UV lamps are formed by fluorescent UV tubes filled with mercury and arranged side by side to form an emitting surface.
• Document US5006758 proposes a UV tanning flat lamp consisting of two UVA-transmitting glass plates, which plates are kept at a small distance from each other, and hermetically sealed so as to enclose a gas under reduced pressure. An electrical discharge produces UV radiation that excites a phosphor coating emitting in the UVA.
• One of the glass plates carries the phosphor coating on its inner face and the other glass plate carries on its inner side sets of conductive coatings or electrodes constituting a cathode and an anode at a given instant.
• the discharge that occurs between anode and cathode is said to be coplanar, i.e., in a direction along the main surface of the glass plate.
• the electrodes are protected by a dielectric coating intended, by capacitive limitation of the current, to avoid a loss of material of the electrodes by ion bombardment in the vicinity of the glass plate.
• a dielectric coating intended, by capacitive limitation of the current, to avoid a loss of material of the electrodes by ion bombardment in the vicinity of the glass plate.
• it is essential to choose a sufficiently resistant dielectric.
• this dielectric layer requires an additional manufacturing step involving an additional cost for the UV lamp only for applications to high added value.
• the object of the invention is to provide a reliable, high-performance planar UV lamp of simpler design that is quick and / or easy to manufacture.
• the invention proposes a plane lamp transmitting a radiation in the ultraviolet, said UV, comprising:
• first and second planar or substantially planar glass elements held substantially parallel to each other and delimiting an internal space filled with gas capable of emitting said radiation in the UV or exciting a phosphor material possibly present and emitting said radiation into the UV, said phosphor material being then disposed on a face of the first and / or second glass element, the first and / or second element being made of a material transmitting said UV radiation
• Electrodes capable of being at different potentials and of being powered by an alternating voltage, said pairs being associated with the first glass element and arranged outside the internal space, electrodes being in the form of strips and / or wires in the first glass element or in another dielectric element associated with the first glass element.
• Electrodes in the form of strips and / or in a dielectric element are simple to make and the plurality of electrodes guarantees a satisfactory luminous efficiency for all gases.
• most or all electrodes may be of the same design.
• the choice of two glass elements simplifies the assembly of the lamp and guarantees a solid and durable flat lamp.
• the first glass element can be chosen to transmit or absorb UV according to the desired applications or configurations (emission by the two glass elements, through the electrodes, etc.), thus giving freedom of choice.
• the first glass element acts as capacitive protection of the electrodes against ion bombardment, and in fact forms a dielectric of constant thickness and excellent uniformity, guaranteeing a uniformity of the UV radiation emitted by the lamp.
• the UV lamp can take dimensions of the order of those currently achieved with fluorescent tubes, or greater, for example of at least 1 m 2 .
• the transmission factor of the lamp according to the invention around the peak of said UV radiation is greater than or equal to 50%, even more preferably greater than or equal to 70%, and even greater than or equal to 80%.
• the other glass element may be opaque, for example a glass-ceramic, or even be a non-glass dielectric.
• the translucent nature can however be used to position the lamp or to view or check the operation of the lamp.
• the electrodes are at least partially covered or integrated in a dielectric element, preferably a plane and / or common to all, selected from the first glass element, another glass element (then forming a reinforced glass) and / or at least one plastic, or possibly a glass or plastic element associated with a gas blade.
• a dielectric element preferably a plane and / or common to all, selected from the first glass element, another glass element (then forming a reinforced glass) and / or at least one plastic, or possibly a glass or plastic element associated with a gas blade.
• the requirements of uniformity or homogeneity are no longer crucial. Also, a wide choice of dielectric and geometry is possible. In addition, in the case where a lamp emitting via both sides is desired, it is easier to choose a dielectric transmitting the UV.
• This element can form part of an insulating glazing unit, under vacuum, under argon, or with a simple air gap.
• a simple thick enough varnish (if necessary to absorb UV radiation) can also be used.
• This dielectric element serves as mechanical or chemical protection and / or forms a lamination interlayer and / or provides a satisfactory electrical insulation if necessary, for example if the electrodes bearing surface is easily accessible.
• the electrodes may be associated with the first glass element in different ways: they may for example be integrated in the latter or in a common dielectric element, or, when they are in strips, be directly deposited on its outer face or on a carrier element (corresponding to said dielectric element), this carrier element being assembled to the first glass element so that the electrodes are pressed against its outer face.
• the electrodes may also be sandwiched between a first dielectric and a second dielectric, the assembly being assembled to the first glass element.
• the first dielectric is a lamination interlayer and the second dielectric is a counter glass or a rigid plastic preferably transparent.
• the electrodes may alternatively be arranged between said first glass element and the lamination interlayer.
• the electrodes are on a preferably thin and / or transparent dielectric located between two lamination interleaves, the dielectric being for example a plastic film or a thin sheet of glass.
• first and second dielectrics can therefore be formed in various combinations associating a glass element or a plastic (rigid, monolithic or laminated) and / or (films) plastic or other resins suitable for joining by gluing with glass products.
• Suitable plastics are, for example: polyurethane (PU) used as flexible, ethylene / vinyl acetate copolymer (EVA) or polyvinyl butyral (PVB), these plastics serving as laminating interlayer, for example with a thickness between 0.2 mm and 1.1 mm, in particular between 0.3 and 0.7 mm, optionally incorporating the electrodes, in their mass, or carrying the electrodes, - rigid polyurethane, polycarbonates, acrylates such as polymethylmethacrylate (PMMA), used in particular as a rigid plastic, and possibly electrode carrier. It is also possible to use PE, PEN or PVC or else polyethylene terephthalate (PET), the latter being thin, in particular between 10 and 100 ⁇ m, and capable of carrying the electrodes.
• PU polyurethane
• EVA ethylene / vinyl acetate copolymer
• PVB polyvinyl butyral
• these plastics serving as laminating interlayer, for example with a thickness between 0.2 mm
• the strip electrodes may be linear, or be of more complex, nonlinear shapes, for example angled, V-shaped, corrugated, zigzag, the spacing between electrodes being kept substantially constant.
• the electrodes may for example be in the form of interpenetrated combs with a constant spacing between adjacent teeth.
• the electrodes are based on a material transmitting said UV radiation or are arranged and / or adapted to allow an overall transmission to said UV radiation (if the material is absorbing or reflecting UV) and the first element is in said material transmitting said UV radiation.
• the electrode material transmitting said UV radiation may be a very thin layer of gold, for example of the order of 10 nm, or of alkali metals such as potassium, rubidium, cesium, lithium or potassium, for example 0.1 at 1 micron, or be an alloy for example with 25% sodium and 75% potassium.
• the electrodes may be substantially parallel strips, having a width 11 and spaced apart by a distance d1, the ratio 11 on d1 being between 10% and 50%, to allow a UV overall transmission. at least 50% of the side of the electrodes, the I1 / d1 ratio can also be adjusted according to the transmission of the associated glass element.
• An electrode material that is relatively opaque to said UV radiation is, for example, fluorine-doped tin oxide (SnO 2: F), mixed indium tin oxide (NTO), silver, aluminum oxide, copper or aluminum.
• F fluorine-doped tin oxide
• NTO mixed indium tin oxide
• silver aluminum oxide
• copper or aluminum Alternatively, if the UV radiation is transmitted only on the side of the second glass element, the ratio 11 to d1 is indifferent.
• the strip electrodes may be solid, in particular formed from contiguous conducting wires (parallel or braided, etc.) or from a ribbon (made of copper, to be glued, etc.) or from a coating deposited by any known means of the invention.
• skilled in the art such as liquid deposits, vacuum deposits (magnetron sputtering, evaporation), by pyrolysis (powder or gaseous route) or by screen printing.
• Electrodes may also each be in the form of a network of essentially elongated conductive patterns such as conducting lines (similar to very fine bands) or conducting wires themselves, these patterns being substantially rectilinear or wavy, zigzag, etc. .
• This network can be defined by a given step said p1 (not minimum in case of plurality of steps) between patterns and a so-called width of 12 patterns (maximum in case of plurality of widths). Two sets of patterns can be crossed.
• This network can to be organized in particular as a grid, as a fabric, a canvas. These patterns are for example metal such as tungsten, copper or nickel.
• the ratio of width 12 to pitch p1 may preferably be less than or equal to 50%, preferably less than or equal to 10%, even more preferably less than or equal to 1%.
• the pitch p1 may be between 5 ⁇ m and 2 cm, preferably between 50 ⁇ m and 1.5 cm, even more preferably 100 ⁇ m and 1 cm, and the width 12 may be between 1 ⁇ m and 1 mm, preferably between 10 and 50 microns.
• a conductive network can be used on a plastic sheet, for example of the PET type, with a pitch p1 between 100 ⁇ m and 300 ⁇ m, and a width 12 of 10 to 20 ⁇ m or a network of at least partially integrated conductive son in a lamination interlayer, in particular PVB or PU, with a pitch p1 between 1 and 10 mm, in particular 3 mm, and a width 12 between 10 and 50 microns, especially between 20 and 30 microns.
• the lamp may comprise a material reflecting said UV radiation covering partially or entirely a face of the first or second glass element, for example aluminum.
• this material covers the preferably internal face of the second glass element.
• the electrodes themselves can be in said reflecting material.
• the material transmitting said UV radiation may be chosen preferably from quartz, silica, magnesium fluoride (MgF 2 ) or calcium fluoride (CaF 2 ), a borosilicate glass, a glass with less than 0.05% Fe 2 ⁇ 3 .
• thicknesses of 3 mm As examples for thicknesses of 3 mm:
• silicosodocalcic glasses with less than 0.05% of Fe III or Fe 2 2 3 , in particular Saint-Gobain's Diamant glass, Pilkington's Optiwhite glass and Schott's B270 glass, transmit more than 70% or even 80% on the full range of UVA.
• the gas pressure in the internal space can be of the order of 0.05 to 1 bar.
• a gas or a mixture of gases is used, for example a gas that effectively emits said UV radiation, in particular xenon, or mercury or halogens, and an easily ionizable gas capable of constituting a plasma (plasma gas) such as a rare gas such as whether neon, xenon or argon or helium, or halogens, or air or nitrogen.
• the level of halogen (mixed with one or more noble gases) is chosen to be less than 10%, for example 4%.
• Halogenated compounds can also be used.
• Rare gases and halogens have the advantage of being insensitive to climatic conditions. Table 1 below shows the radiation peaks of the particularly efficient UV emitting gases.
• UV radiation at 250 nm is emitted by phosphors after excitation by VUV radiation of less than 200 nm such as mercury or a rare gas.
• phosphors emitting in the UVA or near UVB from a VUV radiation Mention may be made of gadolinium doped materials such as YBO 3 : Gd; YB 2 O 5 : Gd; LAP 3 O g: Gd; NaGdSiO 4 ; the
• YAI 3 (BO 3 ) 4 Gd; YPO 4 : Gd; the YAIO 3 : Gd; SrB 4 O 7 : Gd; LaPO 4 : Gd; the LaMgB 5 O 0: Gd, Pr; LaB 3 O 8 : Gd, Pr; (CaZn) 3 (PO 4 ) 2 : TI.
• UVA There are also phosphors emitting in UVA from UVC radiation.
• LaPO 4 Ce; the (Mg, Ba) AI 11 Oi 9 ) Ce; BaSi 2 O 5 Pb; the YPO 4 : This; (Ba 1 Sr 1 Mg) 3 Si 2 O 7 Pb; SrB 4 O 7 : Eu.
• UV lamp 318 nm and 380 nm, is emitted by phosphors after excitation by UVC radiation of the order of 250 nm.
• a coating having a given functionality may be an anti-fouling or self-cleaning coating, in particular a TiO 2 photocatalytic coating deposited on the glass element opposite the emitting face, this coating being able to be activated by UV radiation.
• the lamp may comprise a coating of another phosphor material emitting in the visible associated with the second glass element and disposed on a limited area (inner and / or outer) of this second element.
• This zone may possibly constitute decorative motifs or constitute a display such as a logo or a mark or a lamp indicator.
• the spacing between the two glass elements can be fixed by the spacers to a value of the order of 0.3 to 5 mm.
• a technique for depositing spacers in vacuum insulating glass units is known from FR-A-2 787 133. According to this method, glue points, in particular enamel deposited by screen printing, are deposited on a glass plate. a diameter less than or equal to the diameter of the spacers, the spacers are rolled on the glass plate preferably inclined so that a single spacer is glued on each point of glue. The second glass plate is then applied to the spacers and the peripheral seal is deposited.
• the spacers are made of a non-conductive material to not participate in discharges or short circuit. Preferably, they are realized glass, in particular of soda-lime type. To avoid loss of light by absorption in the material of the spacers, it is possible to coat the surface of the spacers with a transparent or UV reflective material or with a phosphor material identical to or different from that used for the element (s) ( s) glassmaker (s).
• the lamp may be produced by first producing a sealed enclosure where the intermediate air gap is at atmospheric pressure, then evacuating and introducing the plasma gas to the desired pressure.
• one of the glass elements comprises at least one hole drilled in its thickness obstructed by a sealing means.
• the UV lamp as described above can be used both in the industrial field for example for aesthetics, biomedical, electronics or food than in the domestic field, for example for the decontamination of tap water, pool drinking water, air, UV drying, polymerization.
• the UV lamp as described above can be used:
• photochemical activation processes for example for a polymerization, in particular of adhesives, or a crosslinking or for the drying of paper, for the activation of fluorescent material, such as the ethidium bromide used in gel, for nucleic acid or protein analyzes,
• the lamp serves to promote the formation of vitamin D on the skin.
• the UV lamp as described above can be used for the disinfection / sterilization of air, water or surfaces by germicidal effect, especially between 250 nm and 260 nm.
• the UV lamp as described above is used in particular for the treatment of surfaces, in particular before deposition of active layers for electronics, computing, optics, semiconductors
• the lamp can be integrated for example in household appliances such as refrigerator, kitchen shelf.
• FIG. 1 schematically represents a sectional view of an external coaxial discharge UV flat lamp in a first embodiment of the invention
• FIG. 2 schematically represents a sectional view of an external coplanar discharge UV flat lamp in a second embodiment of the invention
• FIG. 3 schematically represents a sectional view of an external coplanar discharge UV flat lamp in a third embodiment of the invention
• FIG. 4 schematically represents a sectional view of a coaxial discharge UV flat lamp. external in a fourth embodiment of the invention.
• FIG. 1 shows a coplanar discharge flat UV lamp 1 having first and second glass plates 2, 3 each having an outer face 21, 31 and an inner face 22, 32.
• the lamp 1 emits UV radiation (symbolized by a arrow F) only by its face 31. This also allows to protect UV radiation the other side possibly accessible.
• each glass plate 2, 3 is for example of the order of 1 m 2 or beyond and their thickness of 3 mm.
• a plurality of electrodes 41, 51 are coupled in pairs. They are in the form of strips directly deposited on the outer face 21, for example serigraphed in silver or are bonded copper strips.
• the electrodes could also be strips formed of networks of conducting wires.
• the outer face 21 itself - at least in the regions of the electrodes - is coated with an electrically insulating and protective plastic film 14. In this mode, this dielectric 14 can be translucent or opaque, depending on the needs.
• the electrodes 41, 51 are disposed on this outer plastic 14 (or between two plastic films) which is assembled so that the electrodes 41, 51 are pressed against the face 21
• the electrodes are in the glass 2, forming for example an armored glass.
• the plates 2, 3 are associated with facing their internal faces 22, 32 and are assembled via a sintering frit 8, for example a glass frit thermal expansion coefficient neighbor that of the plates of glass 2, 3 such as a lead frit.
• a sintering frit 8 for example a glass frit thermal expansion coefficient neighbor that of the plates of glass 2, 3 such as a lead frit.
• the spacing between the glass plates is imposed (at a value generally less than 5 mm) by glass spacers 9 arranged between the plates.
• the spacing is for example 1 to 2 mm.
• the spacers 9 may have a spherical shape, cylindrical, cubic or other polygonal cross-section for example cruciform.
• the spacers may be coated, at least on their side surface exposed to the plasma gas atmosphere, with a UV reflective material.
• the second glass plate 3 has near the periphery a hole 13 pierced in its thickness, a few millimeters in diameter, the outer orifice is obstructed by a sealing pad 12, in particular copper welded to the outer face 31.
• a phosphor 6 emitting in the visible is deposited on a limited area and peripheral of the inner face 21 - or in a variant on the inner face 22 or outer 31 - in the form of letters 'ON' to indicate the operating state.
• the electrodes 41, 51 are fed via a flexible foil 11 or, alternatively, via a soldered wire, by a high frequency voltage signal (not shown), for example with an amplitude of the order of 1500 V and a frequency between 10 and 100. kHz. More specifically, each electrode 41 (respectively electrode 42) is connected to a same 'bus bar' - not shown for the sake of clarity - which is disposed at the periphery of the glass sheet 2 which is connected to said foil, only the electrodes 41 are powered by the high frequency signal, electrodes 51 are then grounded. Alternatively, the electrodes 41 and 51a are fed, for example, signals in phase opposition.
• the gas height may be between 0.5 mm and a few mm high, for example 2 mm.
• high purity silica is preferably selected for high VUV transmission at low cost. Its coefficient of expansion is about 54 10 -8 K -1 .
• This compact and reliable lamp 1 is used for example for the treatment of even large surfaces.
• the structure 1 of the external co-planar discharge UV lamp resumes the structure of FIG. 1 apart from the elements detailed below.
• the electrodes 42, 52 are strips each formed of a network of conductive wires (for example grid and tungsten), which are integrated in the lamination interlayer 14 'with a pitch p1 of 3 mm, and a width 12 of the order of 20 microns.
• the electrodes 42, 52 are arranged on a plastic film, for example a PET thin film, for example with a pitch p1 of 100 ⁇ m, and a width 12 of 10 ⁇ m located between the lamination interlayer 14 'and another lamination insert added.
• a plastic film for example a PET thin film, for example with a pitch p1 of 100 ⁇ m, and a width 12 of 10 ⁇ m located between the lamination interlayer 14 'and another lamination insert added.
• the electrodes 42, 52 are solid and for example arranged in a layer on the face 21, in particular deposited on the face 21 and made by etching.
• At least for the plate 3, and preferably for the two plates 2, 3 is chosen a silicosodocalcique glass such as the Planilux sold by Saint-Gobain company which provides UVA transmission around 350 nm greater than 80% at low cost. Its coefficient of expansion is about 90 10 -8 K -1 .
• the proposed UVA lamp for example serves as a tanning lamp.
• a gadolinium-based phosphor is chosen, and, at least for the plate 3, a borosilicate glass (for example with a coefficient of expansion of approximately 32 10 -8 K -1 ) or a silicosocalocalic glass with less 0.05% Fe 2 O 3 and a rare gas such as xenon alone or in admixture with argon and / or neon.
• a borosilicate glass for example with a coefficient of expansion of approximately 32 10 -8 K -1
• a silicosocalocalic glass with less 0.05% Fe 2 O 3 and a rare gas such as xenon alone or in admixture with argon and / or neon.
• UV coplanar discharge 1 "takes the structure of Figure 1 apart from the items detailed below.
• the lamp 1 "emits UV radiation by its face 21, the plastic 14 being deleted.
• the electrodes 43, 53 are each in the form of a network of thin conductive wires integrated in the glass 2,.
• the size of the wires and / or the distance between the wires and / or the width of the electrodes and / or the interelectrode space are adapted accordingly to increase the overall UV transmission.
• the electrodes 43, 53 are silver screen-printed strips deposited on the face 1. This electrode material is relatively opaque to UV, the electrode width ratio 11 is then adapted to the width of the interelectrode space d1. consequence to increase the overall UV transmission.
• a ratio of width 11 to width d 1 of the interelectrode space of the order of 20% or less is chosen, for example the width 11 is equal to 4 mm and the width d 1 of the interelectrode space is equal to 2 cm.
• a reduced pressure of a mixture of rare gases and halogens 73 - or diatomic halogen or mercury - for a UVC radiation preferably between 250 and 260 nm for a germicidal effect used especially for the disinfection / sterilization of air, water or surfaces.
• a germicidal effect used especially for the disinfection / sterilization of air, water or surfaces.
• C or XeI or KrF can be mentioned.
• the plate 2 of the fused silica or quartz.
• the overall transmission with this glass and the electrodes 43, 53 is 80% at 250 nm.
• a UV-transmitting electrode material is chosen for freedom on the electrode structure.
• the outer face 31 (or in a variant the inner face 32) carries a coating 61 of UV reflective material, for example aluminum, to enhance the transmission and protect the radiation, regardless of the dielectric chosen for the plate 3.
• the structure 1 "of the external co-planar discharge UV lamp resumes the structure of FIG. 3 apart from the elements detailed hereinafter.
• the Planilux glass is chosen and for the plate 2 the Planilux glass is chosen with a fluorine-doped tin oxide layer which is etched to forming the electrodes 44, 54 with a width equal to 1 mm and a gap equal to 5 mm to obtain an overall transmission of about 85% from 360 nm, keeping a very satisfactory homogeneity.
• the electrodes are in the glass 2, forming an armored glass.
• the internal faces 22, 32 carry a coating 6 "of phosphor material emitting radiation in the UVA beyond 350 nm such that the YPO 4 : Ce (peak at 357 nm), the (Ba 1 Sr 1 Mg) 3 Si 2 O 7 Pb (peak at 372 nm), or SrB 4 O 7 : Eu (peak at 386 nm)
• YPO 4 Ce
• Ba 1 Sr 1 Mg 3 Si 2 O 7 Pb
• SrB 4 O 7 Eu
• other phosphors and a borosilicate glass can be chosen to transmit UVA at around 300-330 nm.
• the outer face 31 carries a coating 62 of UV reflective material, for example aluminum, to reinforce the transmission and to protect the radiation whatever the glass chosen for the plate 3.
• This UVA lamp can be used by example to initiate photochemical processes.
• one or more features illustrated in one of the embodiments described above may also be transposed to another of the embodiments.
• the lamination of the second embodiment may alternatively be used in the first embodiment.

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• Physics & Mathematics (AREA)
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• Vessels And Coating Films For Discharge Lamps (AREA)
• Radiation-Therapy Devices (AREA)

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• 2005
  • 2005-08-19 FR FR0552540A patent/FR2889886A1/fr not_active Withdrawn
• 2006
  • 2006-08-10 EP EP06831186A patent/EP1922740A2/de not_active Withdrawn
  • 2006-08-10 WO PCT/FR2006/050798 patent/WO2007042689A2/fr active Application Filing
  • 2006-08-10 JP JP2008526526A patent/JP2009505365A/ja active Pending
  • 2006-08-10 CN CNA2006800302715A patent/CN101243540A/zh active Pending
  • 2006-08-10 KR KR1020087003664A patent/KR20080035634A/ko not_active Application Discontinuation
  • 2006-08-10 CA CA002619669A patent/CA2619669A1/fr not_active Abandoned
  • 2006-08-10 US US12/064,153 patent/US20090179547A1/en not_active Abandoned
  • 2006-08-16 TW TW095130078A patent/TW200739661A/zh unknown

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