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WO2025068130A1 - Vitre lumineuse - Google Patents

Vitre lumineuse Download PDF

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Publication number
WO2025068130A1
WO2025068130A1 PCT/EP2024/076702 EP2024076702W WO2025068130A1 WO 2025068130 A1 WO2025068130 A1 WO 2025068130A1 EP 2024076702 W EP2024076702 W EP 2024076702W WO 2025068130 A1 WO2025068130 A1 WO 2025068130A1
Authority
WO
WIPO (PCT)
Prior art keywords
pane
main surface
light
light guiding
lighting
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.)
Pending
Application number
PCT/EP2024/076702
Other languages
English (en)
Inventor
Kadosa Hevesi
Jean-François NOULET
Héloïse ROELANDTS
Shunsuke SADAKANE
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.)
AGC Glass Europe SA
Original Assignee
AGC Glass Europe SA
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 AGC Glass Europe SA filed Critical AGC Glass Europe SA
Publication of WO2025068130A1 publication Critical patent/WO2025068130A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/10009—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets
    • B32B17/10018—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets comprising only one glass sheet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/10009—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets
    • B32B17/10036—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets comprising two outer glass sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/10165—Functional features of the laminated safety glass or glazing
    • B32B17/10174—Coatings of a metallic or dielectric material on a constituent layer of glass or polymer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/10165—Functional features of the laminated safety glass or glazing
    • B32B17/10541—Functional features of the laminated safety glass or glazing comprising a light source or a light guide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/10807—Making laminated safety glass or glazing; Apparatus therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/418—Refractive

Definitions

  • the present invention relates to a lighting pane, in particular a pane for vehicles, capable of emitting light in an oriented manner.
  • the invention further relates to a composite pane comprising said lighting pane, to a method to provide for said lighting and/or composite pane and to uses thereof.
  • LED modules light-emitting diode modules
  • the light extraction means diffuses light, extracted from the lit sheet, without distinction in all directions.
  • the diffusion angle of the extracted light may be limited, for example in the housing domain, when there is a desire to light a particular decorative element to enhance it, or else in the automobile domain when there is a desire to light an area of the passenger compartment, in proximity to a passenger, without inconveniencing the other passengers, and in particular the driver.
  • Composite panes comprising at least one light guiding pane, thus having lighting functionalities, are known in the art, where it is known to incorporate light-emitting diode (LED) modules at the edge of the composite panes, so that the light emitted by the LEDs enters through the edge of, typically, the inner pane acting as a light guide layer.
  • LED light-emitting diode
  • W02020156737 relates to a vehicle window comprising an outer window member (16) and an inner window member (18), at least one light source (30) and a light-scattering layer for light emitted by the light source (30).
  • the light-scattering layer is located between the inner window member (18) and the outer window member (16) and is formed by a polymer dispersed liquid crystal (PDLC) layer (22).
  • PDLC polymer dispersed liquid crystal
  • WO2021198262 relates to a vehicle window comprising a window body assembly which has an outer face facing the surroundings of the vehicle and an inner face facing the vehicle interior, and which has a light-conducting layer and a light source (24), the light from which can be coupled into the light-conducting layer.
  • An incoupling element (28) is located on the inner face of the window body assembly and couples light emitted by the light source (24) into the lightconducting layer.
  • the objective is, consequently, to provide for a lighting pane and/or composite pane with improved light guiding such that the light intensity is maintained through the lighting pane, and that the quality and homogeneity of the color of the light is maintained through the propagation within the lighting pane.
  • the lighting pane of the present invention comprising: a light guiding pane having a first main surface, a second main surface and an edge, a light source adhered to any of said first main surface, second main surface or edge of the light guiding pane, characterized in that the light guiding pane comprises a light barrier on at least a part of one of its main surfaces.
  • the lighting pane is intended, in a window opening, to separate an interior space from the external environment, for example the interior of a vehicle or of a building.
  • Said lighting pane may be set up as a single-sheet pane, but may however be set up as a composite pane comprising at least two single panes adhered to one another in a known manner by means of a thermoplastic interlayer, with at least one of the pane being the present lighting pane, in further embodiments of the present invention.
  • the term “light guiding pane” will always refer to the pane of the lighting pane lit by the light source or sources.
  • the light guiding pane or lit sheet is preferably the one in contact with the interior of the vehicle or of the building, in the installed position.
  • the light guiding pane comprises a first main surface, a second main surface and an edge.
  • the first main surface will be the surface of the pane facing the interior space in the installed position, while the second main surface will be that surface oriented towards the external environment in the installed position.
  • a part of a main surface is a surface area ranging from 1 to 99% of the entire surface.
  • the light guiding pane may be a glass sheet, or a plastic sheet comprising or consisting of poly(methyl meth)acrylate (PMMA), polycarbonates, polyethyleneterephthalate (PET), polyolefins, polyvinyl chloride (PVC), or mixtures thereof.
  • PMMA poly(methyl meth)acrylate
  • PET polyethyleneterephthalate
  • PVC polyvinyl chloride
  • the light guiding pane is a glass substrate.
  • the glass may be of any type, such as conventional float glass or flat glass, and may be of any composition having any optical properties, e.g., any value of visible transmission above 10%, ultraviolet transmission, infrared transmission, and/or total solar energy transmission.
  • the glass may thus be a glass of soda-lime-silica, aluminosilicate or borosilicate type, and the like.
  • the glass may be a regular clear, colored or extra-clear (i.e. lower iron content and higher transmittance) glass substrate. Further examples of glass substrates include clear, green, bronze, or blue-green glass substrates.
  • Preferred glass substrates for the light guiding pane, or light guide may be selected from clear or extra-clear soda-lime glass, for an optimal light diffusion and light propagation. These typically have a light transmittance of at least 89% (for a glass sheet thickness of 4 mm). They may be qualified as colorless when looking through their main faces.
  • the glass may be annealed, tempered or heat strengthened glass.
  • the light guiding pane may have a thickness ranging from 0.5 mm to 15 mm, alternatively from 0.5 mm to 10 mm, alternatively from 0.5 mm to 8 mm, alternatively from 0.5 mm to 6 mm.
  • optimal thickness for the lighting pane may range from 0.5 to 4 mm, such that is easily applied into architectural or automotive applications.
  • the light source adhered to any of said first main surface, second main surface or edge may be one or a plurality of light emitting diodes mounted on a lateral support fixed to the edge of the lighting pane - peripheral light source with an emitting face facing the injection edge (in contact with the edge or not), or to the first or second main surface of the light guiding pane - peripheral light source with an emitting face facing the injection side of the first main surface for propagation of the injected visible light in the thickness of the inner pane serving as light guide for the injected light.
  • the light source is adhered to the first main surface or to the edge of the light guiding pane.
  • Examples of light sources include light emitting diodes, optical fiber(s) coupled with diodes, or the like.
  • Coupling elements may be made of glass, PMMA (polymethyl methacrylate), PC (polycarbonate), PA (polyamide), COC (cycloolefin copolymer) or COP (cycloolefin polymer).
  • the coupling element may be arranged on the edge or on the first main surface or on the second main surface of the light guiding pane.
  • the coupling element may be attached directly to the first main surface of the light guiding pane, for ease of adhesion and reduced complexity of the mounting of the final lighting pane within a frame, and further, such that the light emitted by the light source may thus be coupled into the light guide layer over a large area.
  • the coupling element thus directs the light emitted by the light source into the light guiding pane at defined angles, which results in a higher coupling efficiency.
  • Glass typically has a refractive index of 1.52, while polyvinylbutyral typically has a refractive index of 1.48 and polyurethane film has a refractive index of 1 .49. Air and vacuum have a refractive index of 1.00. With values of refractive indices considered at a wavelength of 550 nm.
  • TIR total internal reflection
  • the present lighting pane is characterized in that it comprises at least one light barrier arranged on at least a part of one of the main surface of the light guiding pane.
  • the light barrier as disclosed herein indicates a material having an index of refraction at 550 nm of less than 1.52, preferably less than 1.48, more preferably less than 1.45.
  • the light barrier with a refractive index ⁇ 1.52 positioned on at least one surface of the light guiding pane serves to isolate the light propagation within the light guiding pane from interactions with other potential constituents of the lighting pane.
  • the positioning of the barrier ensures the injected light mainly propagates only through the light guide//inner pane and does not exit inappropriately from its defined path.
  • the at least one light barrier may comprise a thin film coating of at least one of SiO 2 , CaF, MgF 2 , and/or a layer of at least one polymer such as epoxy polymers, acrylic polymers, fluoroethylene/vinyl ether alternating copolymer; fluoro acrylic copolymers, polyvinylacetate and polyvinyl alcohol, silicone-based polymers.
  • a polymer such as epoxy polymers, acrylic polymers, fluoroethylene/vinyl ether alternating copolymer; fluoro acrylic copolymers, polyvinylacetate and polyvinyl alcohol, silicone-based polymers.
  • the at least one barrier is a thin film coating, it may be provided by methods of physical vapor deposition (sputtering) process (PVD), or chemical vapor deposition (CVD), or plasma enhanced chemical vapor deposition (PECVD).
  • PVD physical vapor deposition
  • CVD chemical vapor deposition
  • PECVD plasma enhanced chemical vapor deposition
  • These methods may provide for a barrier of thin film coating having a geometrical thickness of from 100 to 1500 nm, preferably of from 150 to 1200 nm.
  • the at least one barrier is a polymer layer
  • it may be provided by methods sol-gel process, dip coating, roller coating, curtain coating or the like. [0041]These methods may provide for a barrier of polymer layer having a geometrical thickness of from 50 nm to 5000 nm, alternatively of from 200 nm to 3500 nm, alternatively of from 400 nm to 3000 nm.
  • the barrier layer is a thin film coating of at least one of SiO 2 , MgF 2 , CaF, as these may be provided easily for large area surface in a reproducible manner, while polymer layers may be more complicated to process in a homogeneous manner over large surfaces.
  • the barrier layer is a layer of silicon dioxide having a refractive index of from 1.30 to 1.50, or preferably to 1.45 and even more preferably to 1.40.
  • suitable silicon dioxide barrier layer may be a porous (nano-structured) SiO 2 silicon dioxide layer.
  • Such material has the main advantage of being stable to weathering and to be conveniently deposited in an homogeneous manner. Further, it is compatible with a wide range of further components which may be provided or adhered to the lighting pane.
  • a porous (nano-structured) SiO 2 silicon dioxide layer may be obtained by PECVD, wherein a layer containing silicon, oxygen, carbon and hydrogen is deposited on the substrate and then the carbon and hydrogen content is reduced such that a layer of porous silica remains on the substrate, such as detailed in patent application EP1679291A1. Said process allows to reduce the hydrogen and carbon content in such a way that vacancies occur and remain on an atomic scale, distributed approximately homogeneously over the layer.
  • the at least one light barrier layer may be positioned either on the first main surface and/or on the second main surface of said light guiding pane, such that said light remains within said light guiding pane, and does not diffuse out. Such coupling maintained within the light guiding pane allows for a more efficient light propagation and light rendering where it is expected.
  • the at least one light barrier is preferably present on and in contact with said part of the main surface, that is, the part on which it is deposited.
  • the present light guiding pane may further comprise a decoupling means.
  • the decoupling means preferably positioned on at least a part of the second main surface of the light guiding pane, opposite the first main surface, enables the laterally coupled-in light to preferably exit via the first main surface of the light guiding pane towards the interior environment.
  • the decoupling means may be a textured or imprinted area of the second main surface of the light guiding pane. Such a textured surface may be obtained by texturing methods, such as laser or etching (for example by sandblasting), while imprinted surfaces may be obtained by applying a paint or enamel on the second main surface of the inner pane.
  • Both texturing and imprinted areas have a refracting and/or scattering effect which enables light to preferentially exit the first main surface of the light guiding pane (extraction surface), towards the interior environment.
  • the decoupling means may be designed in full surface coverage, or only in defined area coverage, such as in a pattern, or in a decorative outline, depending on the final effect of light decoupling that is expected.
  • the decoupling means When (and if) a light barrier is present on a part of the second main surface, in conjunction with a decoupling means, said decoupling means is preferably positioned on and in contact with the second main surface, while the light barrier (if present), is positioned above said decoupling means.
  • the light barrier when the decoupling means is designed as a patterned area, the light barrier may be positioned above the area provided with the decoupling means and the area free of the decoupling means, in direct contact with the second main surface of the light guiding pane.
  • the present invention also relates to a composite pane comprising
  • the lighting pane comprising a. a light guiding pane having a first main surface, a second main surface and an edge, b. a light source adhered to any of said first main surface, second main surface or edge of the light guiding pane, characterized in that the light guiding pane comprises a light barrier on at least a part of one of its main surfaces,
  • thermoplastic material 1) a thermoplastic material
  • thermoplastic material bonds the two panes together by adhering the second main surface of the light guiding pane to the first main surface of the second pane.
  • the composite pane of the present invention is also intended, in a window opening, to separate an interior space from the external environment, for example the interior of a vehicle or of a building.
  • the composite pane thus comprises the lighting pane as inner pane and the second pane as outer pane, both being joined to one another via a thermoplastic interlayer.
  • inner pane is the pane that faces the interior in the installed position and specifically herein, the inner pane will be the light guiding pane of the lighting pane.
  • “0uter pane” refers to the second pane facing the external environment in the installed position.
  • “First main surface” means, in the context of the invention, that surface of the panes that faces the interior in the installed position.
  • “Second main surface” means, in the context of the invention, that surface of the panes that faces the external environment in the installed position.
  • the surfaces of composite panes are typically referenced as follows.
  • the second main surface of the outer pane is referred to as side 1.
  • the first main surface of the outer pane is referred to as side 2.
  • the second main surface of the inner pane is referred to as side 3.
  • the first main surface of the inner pane is referred to as side 4.
  • the first main surface of the outer pane and the second main surface of the inner pane face one another and are bonded to one another by means of the thermoplastic interlayer.
  • the second pane may independently be a glass sheet, or a plastic sheet comprising or consisting of poly(methyl meth)acrylate (PMMA), polycarbonates, polyethyleneterephthalate (PET), polyolefins, polyvinyl chloride (PVC), or mixtures thereof.
  • PMMA poly(methyl meth)acrylate
  • PET polyethyleneterephthalate
  • PVC polyvinyl chloride
  • the second pane and the light guiding pane will both be glass substrates, independently chosen from the glass types discussed above.
  • the inner pane being selected from clear or extra-clear soda-lime glass, for an optimal light diffusion and light propagation
  • the outer pane may be any suitable glass sheet for window pane, clear or colored.
  • the second pane may have a thickness ranging from 0.5 mm to 15 mm, alternatively from 0.5 mm to 10 mm, alternatively from 0.5 mm to 8 mm, alternatively from 0.5 mm to 6 mm.
  • the second pane and light guiding pane may have a thickness ranging from 0.5 to 4 mm.
  • Both panes may have the same thickness, for example 0.5 mm, or 0.8 mm, or 1 .2 mm, or 1.6 mm, or 2.1 mm, or 3 mm.
  • Such symmetrical construction in glass thickness allows for ease of process and conventional sizing of the laminating process.
  • Such asymmetrical constructions in glass thickness allow for flexibility in curvature, and/or in weight management and/or flexibility in light/solar modulation.
  • thermoplastic interlayer of the present composite pane may designate a single-layer sheet or a multilayered interlayer.
  • a "single-layer sheet,” as the name implies, is a single or monolithic thermoplastic layer extruded as one layer which is then used to laminate two panes.
  • a multilayered interlayer may comprise multiple layers, including separately extruded layers, co-extruded layers, or any combination of separately and co-extruded layers of thermoplastic material.
  • a multilayered interlayer could comprise, for example: two or more single-layer sheets combined together ("plural-layer sheet”); two or more layers co-extruded together ("co-extruded sheet”); two or more co-extruded sheets combined together; a combination of at least one single-layer sheet and at least one co- extruded sheet; a combination of at least one plural-layer sheet and at least one co-extruded sheet, or any other combination of sheets as desired.
  • thermoplastic interlayer examples include, but are not limited to, polyvinyl acetal, polyvinyl butyral, polyurethane, poly(ethylene-co-vinyl acetate), polyvinylchloride, poly(vinylchloride-co-methacrylate), polyethylenes, polyolefins, ethylene acrylate ester copolymers, polyethylene- co-butyl acrylate), silicone elastomers, epoxy resins, and acid copolymers.
  • thermoplastic films preferably contain polyvinyl butyral (PVB), ethylene vinyl acetate (EVA), polyurethane (PU) and/or mixtures thereof and/or copolymers thereof, particularly preferably polyvinyl butyral.
  • PVB polyvinyl butyral
  • EVA ethylene vinyl acetate
  • PU polyurethane
  • mixtures thereof and/or copolymers thereof particularly preferably polyvinyl butyral.
  • the films are preferably based on the materials mentioned but can, however, contain other components, for example, plasticizers, photophores, heat insulating particles, infrared absorbing particles, polymer-dispersed liquid crystals, suspended particles, pigments, colorants, or UV absorbers, preferably with a content of less than 50%.
  • the individual thermoplastic film layer preferably have a thickness of about 0.2 mm to 1 mm, for example, 0.38 mm or 0.76 mm.
  • thermoplastic interlayer is indicated to join the second main surface of the light guiding pane to the first main surface of the second pane, irrespective of whether these main surfaces are provided with optional further elements such as coatings or light barriers. It is typically understood herein that the adhesion of the two panes is not hindered by the presence of said optional components on either one of the surfaces to be joined.
  • the composite pane of the present invention may further comprise a low emissivity coating on at least an area of the first main surface of the light guiding pane.
  • coatings comprising one or more layers of metal, metal oxides, metal nitrides, metal oxynitrides, metal carbides, or mixtures thereof.
  • such coatings may typically be obtained by physical vapor depositions or chemical vapor deposition methods.
  • Such coatings may have a thickness ranging of from 5 to 1000 nm.
  • a first layer is understood to be the first applied on the substrate, a second being the second layer applied on the substrate, above the first layer.
  • the successive order of the positions is considered relative to the substrate onwards, up to the uppermost layer.
  • the terms “below”, “underneath”, “under” indicate the relative position of a layer vis a vis a next layer, within the layer sequence starting from the substrate.
  • the terms “above”, “upper” indicate the relative position of a layer vis a vis a next layer, within the layer sequence starting from the substrate.
  • the relative positions of the layers within the stack do not necessarily imply direct contact between the layers. That is, some interlayer may be provided between the first and second layer.
  • a first layer "deposited over" the substrate does not preclude the presence of one or more other coating layers of the same or different composition located between that first layer film and the substrate, provided the objective of the present invention is not jeopardized.
  • a layer may actually be composed of several multiple individual layers. [0078]Unless stated otherwise, all layer thicknesses herein are geometrical layer thicknesses.
  • the presence of such a low emissivity coating on at least an area of the first main surface of the light guiding pane may however interfere with light propagation through said light guiding pane, inducing, in some instances, a color shift. There is thus requirement for a compromise when combining the various functions of lighting and thermal comfort in a same glazing pane.
  • the present light barrier, in presence of a low emissivity coating further allows to preserve the color rendering through said path within the light guiding pane.
  • a low emissivity coating is present in the composite pane, on at least an area of the first main surface of the light guiding pane, at least one light barrier is present under and in contact with said low emissivity coating.
  • the “area” herein is intended to mean a surface of 1 to 99% of the first main surface of the light guiding pane provided with the low emissivity coating.
  • the “area” related to the low emissivity coating may be the same as the “part of the first surface” relative to the light barrier, if both are present simultaneously.
  • a light barrier is present under said low emissivity coating and in contact with the first main surface of the same area of light guiding pane. That is, an area of the first main surface of the inner pane/light guiding pane is provided, in sequence going outwardly from the pane surface, by a first light barrier then by the low emissivity coating as discussed above. In those instances, the light barrier ensures an efficient light propagation through the inner pane/light guide, and interference from the low emissivity coating is alleviated.
  • a second light barrier may be present on a part of the second main surface of the inner pane, facing towards the thermoplastic interlayer, but this is not necessarily required.
  • the second main surface may also be provided with the decoupling means, such as discussed above.
  • the low emissivity coating comprises at least one functional layer that contains a transparent conductive oxide (TCO), selected from indium tin oxide, antimony-doped or fluorinedoped tin oxide, gallium- and/or aluminum-doped zinc oxide, mixed indium zinc, vanadium oxide, tungsten and/or magnesium doped vanadium oxide, niobium-doped titanium oxide and/or cadmium stannate; or at least one nitride based functional layer with low emissivity properties selected from titanium nitride, chromium nitride, niobium nitride, molybdenum nitride, hafnium nitride, or mixtures thereof.
  • TCO transparent conductive oxide
  • TCO transparent conductive oxide
  • ZnO:AI aluminum-doped zinc oxide
  • ZnO:Ga gallium-doped zinc oxide
  • Preferred nitride based functional layer may be selected from titanium nitride or chromium nitride, or mixtures thereof.
  • the refractive index of the material of the TCO functional layer is preferably 1.7 to 2.5.
  • the emissivity of the pane according to the invention can be influenced by the thickness of the functional layer of the low emissivity coating.
  • the thickness of the at least one functional layer may range of from 75 nm to 210 nm, preferably 90 nm to 175 nm, and most preferably 105 nm to 170 nm. This range allows for an optimal compromise between a low emissivity and thermal treatment resistance of the pane.
  • the low emissivity coating may be characterized by an emissivity ⁇ 0.2 (according to the standard EN 12898).
  • a first suitable low emissivity coating includes a coating comprising the following layers, in sequence: a first low refractive index layer, for example silicon oxide, and a transparent conductive oxide layer.
  • the at least one TCO functional layer may be surrounded by dielectric layers which may have alternating low and high refractive indices.
  • the first dielectric layer that is, the layer under the TCO functional layer, may comprise a first sublayer of high refractive index material, and subsequently, a second sublayer of low refractive index material.
  • the second dielectric layer that is, the layer above the TCO functional layer, may comprise a third sublayer of high refractive index material, and subsequently, a fourth sublayer of low refractive index material.
  • Examples of high refractive index dielectric layers that is, with a refractive index > 1.7, alternatively > 1.8, include zirconium doped titanium dioxide, silicon doped titanium dioxide, mixed oxide of zinc and tin, mixed oxide of titanium and silicon.
  • Examples of low refractive index dielectric layers that is, with a refractive index ⁇ 1.6, alternatively ⁇ 1.55, include silicon oxide, zirconium doped silicon oxide, mixed oxide of silicon and aluminum, magnesium fluoride.
  • An optimal low emissivity coating includes a coating comprising the following layers, in sequence: a first high refractive index layer, a first low refractive index layer, a transparent conductive oxide layer, an optional barrier layer, a second low refractive index layer, and an optional top coat having a low refractive index.
  • the first high refractive index layer may have a thickness ranging of from 7 to 23 nm, alternatively of from 8 to 20 nm, alternatively of from 9 to 19 nm.
  • the first low refractive index layer may have a thickness ranging of from 18 to 55 nm, alternatively of from 20 to 50 nm, alternatively of from 25 to 45 nm.
  • the transparent conductive oxide layer may have a thickness ranging of from 75 to 210 nm, alternatively of from 90 to 175 nm, alternatively of from 105 to 170 nm.
  • the optional barrier layer may have a thickness ranging of from 0 to 15 nm, alternatively of from 1 to 15 nm, alternatively of from 1 to 12 nm.
  • the second low refractive index layer may have a thickness ranging of from 40 to 110 nm, alternatively of from 45 to 105 nm, alternatively of from 50 to 95 nm.
  • the optional top coat may have a thickness ranging of from 2 to 40 nm, alternatively of from 5 to 35 nm, alternatively of from 6 to 30 nm.
  • the optional topcoat may be a layer of silicon oxide comprising zirconium in an amount of 5 to 40 mol%.
  • Such an uppermost layer allows for tuning the neutral color rendering of the low emissivity coating together with superior durability, for example against scratches.
  • the low emissivity coating being positioned towards the passenger compartment, it may be subject to wear and scratches from cleaning or passenger occupations. Such passenger occupations may impact the integrity of the coating, such as rubbing or objects, (umbrellas, balls, clothes, etc.).
  • This uppermost layer may also provide compatibility and adhesion to the fastening elements which will subsequently be used to secure the composite pane within a vehicle frame.
  • An optimal low emissivity coating may thus include a coating comprising the following layers, in sequence: a first high refractive index layer having a thickness ranging of from 7 to 23 nm, a first low refractive index layer having a thickness ranging of from 18 to 55 nm, a transparent conductive oxide layer having a thickness ranging of from 75 to 210 nm, an optional barrier layer having a thickness ranging of from 0 to 15 nm, a second low refractive index layer having a thickness ranging of from 40 to 110 nm, and an optional top coat having a low refractive index having a thickness ranging of from 2 to 40 nm.
  • a pane of clear float glass (soda-lime glass) provided with such an optimal low emissivity coating may have a light transmittance of 85 to 94%.
  • the present optimal low emissivity coating may be characterized by an emissivity ⁇ 0.15 (according to the standard EN 12898).
  • suitable low emissivity coating may be a low emissivity coating comprising at least two layers of transparent electrically conductive oxide having each a thickness ranging from 20 to 80 nm, which are separated by at least one layer of dielectric material.
  • a low emissivity coating may thus comprise n’ TCO layers and n’ + 1 dielectric layers, with n’ > 1 , such that each TCO layer is surrounded by two dielectric layers.
  • dielectric layers for such a suitable low emissivity coating include silicon oxide, silicon nitride, zinc oxide, tin oxide, or alloys or mixtures thereof.
  • Another suitable low emissivity coating may comprise, in sequence starting from the substrate surface:
  • a second crystallinity-improving layer •optionally followed by a second crystallinity-improving layer, a second metal nitride functional layer, and a third dielectric layer, wherein the crystallinity-improving layers comprise ZrNx, wherein x is higher than 1.2 and at most 2.0
  • the metal nitride functional layers are selected from the group consisting of titanium nitride, chromium nitride, niobium nitride, molybdenum nitride and hafnium nitride and may have a thickness ranging from 3 to 60 nm and the first, second and/or third dielectric layers may have a thickness ranging from 1 .5 to 2000 nm and advantageously comprise silicon nitride doped with aluminum.
  • a low emissivity coating comprising a metal nitride functional layer may further comprise a toplayer comprising silicon dioxide, titanium nitride and/or carbon.
  • the present composite pane may further comprise an IR reflective coating present between the second pane and the light guiding pane.
  • the first role of such an IR reflective coating is to reflect the infrared portions of the solar radiation, and so reduce the heat transfer towards the interior of the vehicle.
  • the IR reflective coating may be embedded in (that is, within) the thermoplastic interlayer, or at least one IR reflective coating may be applied directly on the first main surface of the outer pane or on the second main surface of the inner pane.
  • the IR reflective coating is embedded in the thermoplastic interlayer, the IR reflective coating is applied to a carrier film that is arranged between two thermoplastic films.
  • the carrier film preferably contains polyethylene terephthalate (PET) and has a thickness of 0.012 to 0.2 mm.
  • PET polyethylene terephthalate
  • the IR reflective coating is applied on a surface of a pane, facing the thermoplastic interlayer, it is typically provided by physical vapor deposition methods.
  • the IR reflective coating may comprise n infrared reflective (IR) layers and n + 1 dielectric layers, with n > 1, such that each IR layer is surrounded by two dielectric layers.
  • the IR reflective coating preferably comprises n infrared reflective (IR) layers and n + 1 dielectric layers, with n > 1 , such that each IR layer is surrounded by two dielectric layers.
  • IR infrared reflective
  • the IR reflective layer may be made of silver, gold, palladium, platinum or alloys thereof.
  • the IR reflective layer or functional layer may have a thickness from 2 to 30 nm, alternatively from 5 to 20 nm, alternatively from 7 to 18 nm. These thickness ranges may enable the desired solar control function and/or conductivity (when needed) to be achieved.
  • the dielectric layers may typically comprise oxides, nitrides, oxynitrides or oxycarbides of Zn, Sn, Ti, Zr, Si, In, Al, Bi, Ta, Hf, Mg, Nb, Y, Ga, Sb, Mg, Cu, Ni, Cr, Fe, V, B or mixtures thereof.
  • the dielectric layers may comprise oxides, nitrides, oxynitrides or oxycarbides of Zn, Sn, Ti, Zr, Si, In, Al, Nb, Sb, Ni, Cr, V, Mb, Mg or mixtures thereof.
  • the dielectric layers may comprise oxides, nitrides, oxynitrides of Zn, Sn, Ti, Zr, Si, In, Al, Nb, Sb, Ni, Cr, or mixtures thereof.
  • These materials may optionally be doped, where examples of dopants include aluminum, zirconium, or mixtures thereof.
  • dopants include aluminum, zirconium, or mixtures thereof.
  • the dopant or mixture of dopants may be present in an amount up to 15 wt %.
  • dielectric materials include, but are not limited to, silicon based oxides, silicon based nitrides, zinc oxides, aluminum doped zinc oxides, zinc-based oxides, tin oxides, mixed zinc-tin oxides, silicon nitrides, silicon oxynitrides, titanium oxides, aluminum oxides, zirconium oxides, niobium oxides, aluminum nitrides, bismuth oxides, mixed silicon-zirconium nitrides, and mixtures of at least two thereof, such as for example titanium-zirconium oxides, titanium-niobium oxides, zinc-titanium oxides, zinc-gallium oxides, zinc-indium-gallium oxides (IGZO), zinc-titanium-aluminum oxides (ZTAO), zinc-tin-titanium oxides, zinc-aluminum- vanadium oxides, zinc-aluminum-molybdenum oxides, zinc-aluminum
  • the dielectric layer may consist of a plurality of individual layers comprising or essentially consisting of the above materials.
  • the dielectric layers may each have a thickness ranging from 0.1 to 200 nm, alternatively from 0.1 to 150 nm, alternatively from 1 to 120 nm, alternatively from 1 to 80 nm. Different dielectric layers may have different thicknesses. That is, the first dielectric layer may have a thickness that is the same or different, greater or smaller, compared to the thickness of the second or third or any other dielectric layer.
  • a pane of clear float glass (soda-lime glass) provided with such an IR reflective coating may have a light transmittance of 25 to 80%, provided the solar control is ensured for thermal comfort within the inner environment.
  • the IR reflective coating may be an electrically conductive coating such as an electrically conductive heated window coating or a single-film or multi-film coating capable of functioning as an antenna.
  • the present composite pane may further comprise a functional film selected from electrochromic films, suspended particles devices (SPDs), polymer-dispersed liquid-crystal (PDLC) films or guest host liquid crystal (GHLC), thermochromic films, or photovoltaic components.
  • a functional film selected from electrochromic films, suspended particles devices (SPDs), polymer-dispersed liquid-crystal (PDLC) films or guest host liquid crystal (GHLC), thermochromic films, or photovoltaic components.
  • SPDs suspended particles devices
  • PDLC polymer-dispersed liquid-crystal
  • GHLC guest host liquid crystal
  • thermochromic films or photovoltaic components.
  • Said electrically powered functional film may be provided between the outer pane and the thermoplastic interlayer, more specifically, embedded within the interlayer or on and in contact with the first main surface of the outer pane.
  • the functional film may be provided on a carrier film, such as a polyethylene terephthalate (PET) substrate, having a refractive index of 1.57-1.58.
  • PET polyethylene terephthalate
  • Electrodes function with a variation of light transmittance obtained by modifying the state of colored ions in the film compositions.
  • Suspended particles devices comprise, in suspension, layers of particles that, depending on the application of an electric voltage, are or are not ordered.
  • Polymer-dispersed liquid-crystal (PDLC) films consist of a polymer containing liquid crystals sensitive to the application of the electric voltage.
  • Thermochromic films function by modifying the light transmission of the glazing upon varying temperature switches, not requiring any voltage.
  • the thermoplastic interlayer may thus comprise several individual sheets of thermoplastic material, such that the individual sheet(s) between the second main surface of the inner pane and the functional film have a light transmittance equal or more than 50%, such that the light emitted from the functional film layer may reach the interior environment.
  • a further sheet of glass may have a thickness of from 0.3 to 1 .8 mm, preferably 0.3 to 1 .2 mm. The thinner the sheet, the lighter the end weight of the composite pane.
  • the present arrangement of the lighting pane provided with a light barrier has the advantage that any component such as a coating, a switchable foil, or a solar cell, can be added to the lighting pane without having an impact on the light traveling within the light guiding pane. Further, the light propagating through the light guiding pane is not affected by any switching of a switchable foil. [0135]
  • the present invention also relates to the method to obtain a composite pane comprising the steps of:
  • a lighting pane comprising a light guiding pane having a first main surface, a second main surface, and a light barrier on at least a part of one of its main surfaces,
  • thermoplastic interlayer 3
  • thermoplastic interlayer assembling the first main surface of the second pane and the second main surface of the light guiding pane by means of the thermoplastic interlayer to provide for a laminated glazing.
  • the at least one light barrier on at least a part of one of the first or second main surface of the light guiding pane may be provided as a thin film coating by the methods discussed above, relative to the barrier layer, that is, physical vapor deposition (sputtering) process (PVD), or chemical vapor deposition (CVD), or plasma enhanced chemical vapor deposition (PECVD).
  • PVD physical vapor deposition
  • CVD chemical vapor deposition
  • PECVD plasma enhanced chemical vapor deposition
  • the present method may further comprise a step of providing for a low emissivity coating on the first main surface of the light guiding pane.
  • the present method may also further comprise a step of providing for an infrared reflective coating on either one of the second main surface of the inner pane, or on the first main surface of the outer pane or within the thermoplastic interlayer.
  • the steps of provision of the low emissivity coating, and/or of the IR reflective coating include a deposition step, using a method selected among CVD, PECVD, PVD, magnetron sputtering, or the like.
  • the glass panes provided with the respective coatings may subsequently be subjected to a thermal treatment, to reinforce the glass panes, and to optimize performances of said coatings.
  • the thermal treatments comprise heating the glazing to a temperature of at least 560°C in air, for example between 560°C and 700°C, in particular around 630°C to 670°C, during around 3, 4, 6, 8, 10, 12 or even 15 minutes according to the heat-treatment type and the thickness of the glazing.
  • the treatment may comprise a rapid cooling step after the heating step, to introduce a stress difference between the surfaces and the core of the glass so that in case of impact, the so-called tempered glass sheet will break safely in small pieces. If the cooling step is less strong, the glass will then simply be heat-strengthened and in any case offer a better mechanical resistance.
  • the step of assembling the 2 panes and the at least one interlayer may be a lamination step for flat panes, or may be a bending step for curved laminated panes, which bending step includes the steps of first bending the panes and secondly, laminating said bent panes.
  • the composite pane may then be subject to enamel deposition or preparation for inclusion within a frame.
  • the present invention also relates to the use of the lighting pane according to the invention as a window pane of a vehicle.
  • the present invention also relates to the use of the composite pane according to the invention as a window pane of a vehicle.
  • the present lighting pane and/or composite pane may particularly be used as a roof for a vehicle.
  • the window pane preferably is a roof panel of a vehicle, in particular a passenger car, as it may best provide for homogeneous light propagation in the viewable surface from the passenger compartment.
  • a vehicle includes those vehicles useful for transportation on road, in air, in and on water, in particular cars, busses, tramways, trains, ships, aircraft, spacecraft, space stations and other motor vehicles.
  • the window panes include rear window, side windows, sun roof, panoramic roof, sidelite, quarter lite (QLF), or any other window useful for a car, or any glazing for any other transportation device, where light transmittance > 70% is not a mandatory feature.
  • QLF quarter lite
  • present lighting pane and/or composite pane may be also be useful in architectural applications.
  • Architectural applications include displays, windows, doors, partitions, shower panels, and the like.
  • the composite pane may serve as a heatable vehicle glazing.
  • the present invention also relates to the use of a light barrier as a confining means for light propagating within a light guiding pane, wherein said light guiding pane, having a first main surface, a second main surface and an edge, is part of a lighting pane also comprising a light source adhered to the first main surface or to the edge of the light guiding pane, and wherein the light barrier is present on the light guiding pane on at least a part of one of its main surfaces, said main surface being further provided with a low emissivity coating above and in contact with the light barrier.
  • Figure 1 depicts a cross-section through a first embodiment of the lighting pane according to the invention.
  • the lighting pane 101 has a size of approximately 1 m 2 and is intended to separate an interior environment from an external environment.
  • the lighting pane comprises a light guiding pane 010 having a first main surface 01 intended to face the interior, a second main surface 02 intended to face the external environment and an edge 03.
  • the peripheral light source and coupling element 81 are positioned on the first main surface 01 of the light guiding pane 010.
  • a plurality of peripheral light sources and coupling elements are provided along the lateral edges of the lighting pane.
  • the lighting pane of Figure 1 comprises a light barrier 71 positioned on surface 01 , facing the interior environment.
  • a decoupling element 72 is present on the main surface 02 of the light guiding pane 010, as a patterning or surface etching, in contact with the main surface 02.
  • the present light barrier allows for an optimal bouncing of the light in homogeneous colors and intensity throughout the length of the path.
  • a low emissivity coating (not shown) may be present above and in contact with the light barrier, towards the interior environment.
  • Figure 2 depicts a cross-section through an embodiment of a composite pane 201 according to the invention.
  • the composite pane comprises an outer pane 10 and a light guiding pane 20 that are joined to one another via a thermoplastic interlayer 30.
  • the composite pane is intended for use as a roof panel of a passenger car, with the outer pane 10 intended to face the external environment and the light guiding pane 20 intended to face the vehicle interior.
  • the outer pane 10 has an second main surface 11 and an first main surface 12.
  • the light guiding pane 20 has an second main surface 21 and an first main surface 22.
  • the second main surfaces 11 and 21 face the external environment in the installed state; the first main surfaces 12 and 22 face the vehicle interior in the installed position.
  • the first main surface 12 of the outer pane 10 and the second main surface 21 of the light guiding pane 20 face one another, and are bonded by the thermoplastic interlayer 30.
  • the outer pane 10 and the light guiding pane 20 contain clear soda lime glass.
  • the light guiding pane may be an extra clear glass sheet. They may each have a thickness of 2.1 mm, or one pane may have a thickness of 1.6 mm, and the other pane may have a thickness of 2.1 mm.
  • thermoplastic interlayer 30 may generally have a thickness of 0.76 mm.
  • the composite pane of Figure 2 comprises a light barrier 71 on surface 22, towards the interior environment in the installed position.
  • a low emissivity coating 51 is further arranged above and in contact with the light barrier 71.
  • a decoupling element 72 is present on the main surface 21 of the light guiding pane 20, as a patterning or surface etching, in contact with the main surface 21 , under and in contact with the thermoplastic interlayer 30.
  • Figure 2 comprises a peripheral light source and coupling element 81 positioned on the inner-side surface (P4) of the light guiding pane 20. Preferably, there is direct contact between the peripheral light source and coupling element 81 and the light guiding pane.
  • the present light barrier allows for an optimal bouncing of the light in homogeneous colors and intensity throughout the length of the path.
  • Enamel coatings or dark prints 61 and 62 may be provided as obscuration bands typically present on vehicle glazings, intended to be mounted on a vehicle frame. Typical fastening methods may be employed to secure the composite pane on a vehicle.
  • various alternatives of the composite pane of Figure 2 may further comprise an additional glass pane, or a switchable film within the thermoplastic interlayer, towards the exterior.
  • an IR reflective coating may be present on either of surfaces 12 or 21 , or within interlayer 30.
  • the selected light barrier allows for an optimal light propagation through the light guide, such that its intensity and color definition remains stable throughout the length of the light path through the light guiding pane.
  • the light barrier is particularly useful when a low emissivity coating is present on the light guiding pane, towards the interior environment. Said low emissivity coating may indeed negatively impact the light intensity throughout the pane, such that colors may shift. The presence of the light barrier between the light guiding pane and the low emissivity coating ensure light isolation and optimal propagation within the pane.
  • FIG. 1 Various composite panes were prepared comprising a light guiding pane as inner pane, provided with a light barrier, and a second/outer pane, comprising the following elements.
  • the second pane and the light guiding pane were selected from clear float glass of 2.1 mm, although the thickness is not critical for the analysis of the behavior of the light within the light guide provided with the light barrier.
  • the key indicator will be the level of internal light reflexion inside the light guide for two incidence angles (namely 6 and 13° from the glass surface).
  • the internal light reflectance is shown separately for incident light wavelengths of 625, 528 and 465 nm, respectively representative for Red, Green and Blue colors (RGB wavelengths) and referred to as R_625, R_528 and R_465.
  • the light reflectance inside the glass at the interface with the coating stacks was calculated by simulation for the different coating stacks and incidence angles.
  • the refractive index of the glass used in these simulations was 1.52, representative for typical glass compositions to be used in the industry.
  • Comparative Example 1 was a clear float glass sheet. The standard light propagation within such a clear float glass sheet indicated that the three main colors are reflected at 100 %.
  • Comparative Example 2 was a clear float glass sheet as in Comparative example 1 , further provided with a first low emissivity coating such as in Table 1 on the surface of the light guiding pane towards the interior environment. In absence of a light barrier, some light loss was observed for the RGB wavelengths, at various grades for both observation angles of 6° and 13°.
  • Comparative Example 3 was a clear float glass sheet as in Comparative example 2, provided with a low emissivity coating such as in Table 1 on the surface of the light guiding pane towards the interior environment, and further provided with an unsuitable light barrier as a silicon dioxide layer of 732 nm thick having a refractive index of 1.54, that is > 1.52, between the glass sheet and the low emissivity coating. It was observed that the light loss is not improved.
  • Comparative Example 4 was a clear float glass sheet as in Comparative example 1 , further provided with a second (and alternative) low emissivity coating on the surface of the light guiding pane towards the interior environment. In absence of a light barrier, significant light loss was observed for the red and blue wavelengths and some loss was observed for the green wavelength, at various grades for both observation angles of 6° and 13°, because of strong and detrimental interactions of the light with the layers of the low emissivity coating.
  • Example 1 was a clear float glass sheet as in Comparative example 1 , further provided with a first low emissivity coating such as in Table 1 on the surface of the light guiding pane towards the interior environment, further provided with a light barrier of silicon dioxide layer of 512 nm thick having a refractive index of 1.50.
  • the barrier layer is located between the glass sheet and the low emissivity coating, in contact with both.
  • the light loss - as compared to Comparative Example 1 was reduced at both angles of 6° and 13°, by a value of at least 1% light reflection in all three color wavelengths.
  • a suitable light barrier alleviates the interactions of the light with the low emissivity coating such that propagation is positively maintained.
  • Example 2 was a repeat of Example 1 with a light barrier of silicon dioxide layer of 512 nm thick having a refractive index of 1.47. The light loss is decreased at both angles of 6° and 13°, reaching up to 100% reflection in the blue and green wavelengths at an angle of 6°.
  • Example 3 was a repeat of Example 1 with a light barrier of silicon dioxide layer of 320 nm thick having a refractive index of 1.40. The light loss is decreased at both angles of 6° and 13°, reaching up to 100% reflection in the blue and green wavelengths at an angle of 6°.
  • Examples 4 to 6 were based on a clear float glass sheet as in Comparative example 1, further provided with a first low emissivity coating such as in Table 1 on the surface of the light guiding pane towards the interior environment, further provided with a light barrier of silicon dioxide layer having a refractive index of 1 .37.
  • the barrier layer is located between the glass sheet and the low emissivity coating, in contact with both.
  • Said barrier layer was a porous (nano-structured) silicon dioxide, obtained by a plasma- enhanced CVD process, such as in EP1679291A1 , performed in a mixed reactive gas atmosphere Argon, Oxygen and TMDSO, the latter having a concentration 5 atomic% of the total gas flow.
  • the plasma in the CVD method was excited by pulsed microwave radiation with pulse duration varied in the range of 0.1 to 10 ms and the pulse pause in the ratio 1 :1 to 1 :500 set to the pulse duration.
  • the content of silicon, oxygen, carbon and hydrogen in the barrier layer was tuned by adjusting the gas mixture content and the pulsing parameters in a way that a refractive index n of 1.37 was obtained after annealing of the layer in free atmosphere.
  • the annealing conditions are typical of the firing cycle applied for bending automotive glazings, with maximal glass temperatures in the cycle typically reaching 630 to 650 °C for 3 to 10 minutes.
  • the barrier layer had a thickness of 105 nm in Example 4; of 284 nm in Example 5 and of 400 nm in Example 6.
  • Example 6 the light loss is significantly decreased at both angles of 6° and 13°, with virtually no light loss.

Landscapes

  • Laminated Bodies (AREA)

Abstract

La présente invention concerne une vitre d'éclairage (101), en particulier une vitre pour véhicules, apte à émettre de la lumière de manière orientée. La vitre d'éclairage (101) comprend une vitre de guidage de la lumière (020) présentant une première surface principale (01), une seconde surface principale (02) et une bordure (03), une source de lumière (81) fixée à un élément quelconque parmi ladite première surface principale (01), ladite seconde surface principale (02) ou ladite bordure (03) de la vitre de guidage de la lumière (010), caractérisée en ce que la vitre de guidage de la lumière (020) comprend une barrière lumineuse (71) sur au moins une partie de l'une de ses surfaces principales. L'invention concerne en outre une vitre composite comprenant ladite vitre d'éclairage (101), un procédé de fourniture de ladite vitre d'éclairage et/ou composite et leurs utilisations.
PCT/EP2024/076702 2023-09-26 2024-09-23 Vitre lumineuse Pending WO2025068130A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP23199889.9 2023-09-26
EP23199889 2023-09-26

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WO2025068130A1 true WO2025068130A1 (fr) 2025-04-03

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WO (1) WO2025068130A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1679291A1 (fr) 2005-01-10 2006-07-12 INTERPANE Entwicklungs- und Beratungsgesellschaft mbH & Co. KG Procédé pour la fabrication d une couche à reflection basse
US20150301268A1 (en) * 2006-10-06 2015-10-22 Qualcomm Mems Technologies, Inc. Optical loss structure integrated in an illumination apparatus
US20160349442A1 (en) * 2014-02-10 2016-12-01 Saint-Gobain Glass France Luminous glazing unit with optical isolator
WO2020156737A1 (fr) 2019-01-28 2020-08-06 Webasto SE Vitre de véhicule dotée d'une couche de diffusion lumineuse
DE202021100843U1 (de) * 2021-02-19 2021-03-17 Agp America S.A. Beleuchtetes Laminat mit hervorragender Ästhetik und Helligkeit
WO2021198262A1 (fr) 2020-04-03 2021-10-07 Webasto SE Vitre de véhicule comprenant une source lumineuse et une couche conductrice de lumière
DE102020207235A1 (de) * 2020-06-10 2021-12-16 Volkswagen Aktiengesellschaft Scheibenverbund mit Lichtbarriere

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1679291A1 (fr) 2005-01-10 2006-07-12 INTERPANE Entwicklungs- und Beratungsgesellschaft mbH & Co. KG Procédé pour la fabrication d une couche à reflection basse
US20150301268A1 (en) * 2006-10-06 2015-10-22 Qualcomm Mems Technologies, Inc. Optical loss structure integrated in an illumination apparatus
US20160349442A1 (en) * 2014-02-10 2016-12-01 Saint-Gobain Glass France Luminous glazing unit with optical isolator
WO2020156737A1 (fr) 2019-01-28 2020-08-06 Webasto SE Vitre de véhicule dotée d'une couche de diffusion lumineuse
WO2021198262A1 (fr) 2020-04-03 2021-10-07 Webasto SE Vitre de véhicule comprenant une source lumineuse et une couche conductrice de lumière
DE102020207235A1 (de) * 2020-06-10 2021-12-16 Volkswagen Aktiengesellschaft Scheibenverbund mit Lichtbarriere
DE202021100843U1 (de) * 2021-02-19 2021-03-17 Agp America S.A. Beleuchtetes Laminat mit hervorragender Ästhetik und Helligkeit

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