EP2834557A2 - Lentille pouvant être chauffée pour luminaires et/ou sa procédée de fabrication - Google Patents

Lentille pouvant être chauffée pour luminaires et/ou sa procédée de fabrication

Info

Publication number
EP2834557A2
EP2834557A2 EP13717913.1A EP13717913A EP2834557A2 EP 2834557 A2 EP2834557 A2 EP 2834557A2 EP 13717913 A EP13717913 A EP 13717913A EP 2834557 A2 EP2834557 A2 EP 2834557A2
Authority
EP
European Patent Office
Prior art keywords
lens
layer
example embodiments
coating
conductive coating
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.)
Withdrawn
Application number
EP13717913.1A
Other languages
German (de)
English (en)
Inventor
David P. MAIKOWSKI
David D. Mclean
Timothy Bourque
Christopher Hobbs
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.)
Guardian Glass LLC
Original Assignee
Guardian Industries Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US13/437,384 external-priority patent/US8939606B2/en
Application filed by Guardian Industries Corp filed Critical Guardian Industries Corp
Publication of EP2834557A2 publication Critical patent/EP2834557A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G02B1/11—Anti-reflection coatings
    • G02B1/113—Anti-reflection coatings using inorganic layer materials only
    • G02B1/115—Multilayers
    • 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
    • B32B17/10201—Dielectric coatings
    • B32B17/10211—Doped dielectric layer, electrically conductive, e.g. SnO2:F
    • 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
    • B32B17/1055—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 resin layer, i.e. interlayer
    • B32B17/10761—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 resin layer, i.e. interlayer containing vinyl acetal
    • 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
    • B32B17/1055—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 resin layer, i.e. interlayer
    • B32B17/10788—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 resin layer, i.e. interlayer containing ethylene vinylacetate
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
    • C03C17/34—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions
    • C03C17/3411—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions with at least two coatings of inorganic materials
    • C03C17/3429—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions with at least two coatings of inorganic materials at least one of the coatings being a non-oxide coating
    • C03C17/3435—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions with at least two coatings of inorganic materials at least one of the coatings being a non-oxide coating comprising a nitride, oxynitride, boronitride or carbonitride
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
    • C23C14/08—Oxides
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
    • C23C14/08—Oxides
    • C23C14/083—Oxides of refractory metals or yttrium
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
    • C23C14/10—Glass or silica
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/20—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by refractors, transparent cover plates, light guides or filters
    • F21S43/235—Light guides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/20—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by refractors, transparent cover plates, light guides or filters
    • F21S43/235—Light guides
    • F21S43/236—Light guides characterised by the shape of the light guide
    • F21S43/239—Light guides characterised by the shape of the light guide plate-shaped
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/20—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by refractors, transparent cover plates, light guides or filters
    • F21S43/235—Light guides
    • F21S43/242—Light guides characterised by the emission area
    • F21S43/245—Light guides characterised by the emission area emitting light from one or more of its major surfaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/20—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by refractors, transparent cover plates, light guides or filters
    • F21S43/26—Refractors, transparent cover plates, light guides or filters not provided in groups F21S43/235 - F21S43/255
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G02B1/11—Anti-reflection coatings
    • G02B1/113—Anti-reflection coatings using inorganic layer materials only
    • G02B1/115—Multilayers
    • G02B1/116—Multilayers including electrically conducting layers
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/0006—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 with means to keep optical surfaces clean, e.g. by preventing or removing dirt, stains, contamination, condensation
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/84—Heating arrangements specially adapted for transparent or reflecting areas, e.g. for demisting or de-icing windows, mirrors or vehicle windshields
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00—Electroluminescent light sources
    • H05B33/12—Light sources with substantially two-dimensional radiating surfaces
    • H05B33/22—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of auxiliary dielectric or reflective layers
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C2217/00—Coatings on glass
    • C03C2217/70—Properties of coatings
    • C03C2217/73—Anti-reflective coatings with specific characteristics
    • C03C2217/734—Anti-reflective coatings with specific characteristics comprising an alternation of high and low refractive indexes
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C2217/00—Coatings on glass
    • C03C2217/90—Other aspects of coatings
    • C03C2217/94—Transparent conductive oxide layers [TCO] being part of a multilayer coating
    • C03C2217/948—Layers comprising indium tin oxide [ITO]
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C2218/00—Methods for coating glass
    • C03C2218/30—Aspects of methods for coating glass not covered above
    • C03C2218/365—Coating different sides of a glass substrate

Definitions

  • Certain example embodiments of this invention relate to heatable lenses for luminaires, and/or methods of making the same. More particularly, certain example embodiments of this invention relate to glass substrates that support antireflective and conductive coatings on opposing major surfaces thereof that help serve as chemical and environmental barriers to underlying luminaires and help remove moisture-related disturbances from surfaces thereof and reduce transmission losses related to reflection, and/or methods of making the same.
  • One aspect of certain example embodiments of this invention relates to a heatable glass lens solution that provides localized heating to remove condensation (e.g., snow, ice, etc.) build-up thereon, that otherwise could reduce the associated lighting system's light output and efficiency.
  • condensation e.g., snow, ice, etc.
  • Another aspect of certain example embodiments of this invention relates to a monolithic tempered coated glass solution that allows the glass lens to be rapidly and uniformly heated in a SSL fixture while also achieving high light output efficiency.
  • Certain example embodiments include a high transmittance conductive coating (e.g., greater than about 87% on clear float glass), that optionally incorporate a visual antireflective (AR) coating on the opposite side of the monolithic glass lens to further enhance light transmission (e.g., for another 4% point visible light
  • a lens for a lighting system is provided.
  • a glass substrate supports antireflective and transparent coatings on first and second major surfaces thereof, respectively.
  • At least one bus bar is in electrical communication with the conductive coating, with the at least one bus bar being configured to convey voltage to the conductive coating from an external power source to, in turn, cause the conductive coating to heat up.
  • the antireflective and transparent coatings are sputtered coatings.
  • the substrate is heat treated together with the antireflective and transparent coatings thereon.
  • a lighting system may include one or more solid state lights (e.g., LEDs, OLEDs, PLEDs, Plasma Emitting Discharge, etc., in an array or other format).
  • the lenses described herein may, for example, be interposed between the one or more solid state lights and a viewer of the lighting system.
  • a power source operable to drive the conductive coating of the lens at a power density of 1 -6 W/in 2 is provided.
  • a lighting system including one or more solid state lights.
  • a lens is spaced apart from the one or more solid state lights.
  • the lens includes: a first glass substrate supporting a sputter-deposited antireflective coating on a major surface thereof and a second glass substrate supporting a sputter-deposited conductive coating on a major surface thereof.
  • the first and second substrates are laminated to one another such that coated surfaces thereof face away from one another. The first substrate with the
  • antireflective coating thereon and/or the second with the conductive coating thereon is/are heat treated.
  • a method of making a heatable lens for a lighting system is provided.
  • a multilayer antireflective coating is sputter deposited on a first major surface of a glass substrate.
  • a multilayer conductive coating is sputter deposited on a second major surface of the glass substrate, with the first and second major surfaces being opposite one another.
  • the glass substrate is heat treated with the multilayer antireflective and conductive coatings thereon.
  • At least one bus bar is disposed on the glass substrate such that the at least one bus bar is in electrical communication with the conductive coating so as to heat the substrate when voltage is provided from an external power source.
  • a method of making a lighting system is provided.
  • the methods of making the lenses described herein may be performed.
  • a solid state light source is provided.
  • the lens is provided in spaced apart relation to the light source.
  • the at least one bus bar of the lens is connected to an external power source.
  • FIGURE 1 is a cross-sectional view of an example heatable substrate in accordance with certain example embodiments
  • FIGURE 2 is an example antireflective coating that may be used in connection with certain example embodiments
  • FIGURE 3 is an example transparent coating that may be used in connection with certain example embodiments
  • FIGURE 4 is a flowchart showing an illustrative process for making the heatable substrate of Fig. 1 , in accordance with certain example embodiments;
  • FIGURE 5 is a cross-sectional view of an example heatable arrangement in accordance with certain example embodiments.
  • FIGURE 6 is a flowchart showing an illustrative process for making the heatable arrangement of Fig. 5, in accordance with certain example embodiments.
  • Certain example embodiments of this invention relate to heatable glass substrates that may be used in connection with lighting applications, and/or methods of making the same.
  • a glass substrate supports an antireflective (AR) coating on a first major surface thereof, and supports a conductive coating on a second major surface thereof, the first and second major surfaces being opposite one another.
  • Bus bars connect the conductive coating to a power source in certain example embodiments.
  • the substrate may be thermally tempered, e.g., with one or both coatings thereon. In other words, the antireflective coating and/or the conductive coating may survive thermal tempering processes.
  • Fig. 1 is a cross-sectional view of an example heatable substrate in accordance with certain example embodiments.
  • the substrate 1 supports an antireflective coating 3 on a first major surface thereof, as well as a conductive coating 5 on an opposing major surface thereof. Bus bars in any suitable configuration may be used to help supply power to the conductive coating 5 supported by the substrate 1.
  • the antireflective coating 3 is provided proximate to the outside of the overall lighting assembly, whereas the conductive coating 5 is provided closer to the light source(s) 9.
  • the light source(s) 9 may be any suitable light source(s).
  • the light source(s) 9 may comprise an array of LED, OLED, PLED, and/or other light sources in different example embodiments.
  • the bus bars 7 shown in Fig. 1 may provide an interface between the incoming electrical load and the conductive coating 5.
  • the bus bars 7 may be of or include Ag.
  • the bus bars 7 may be silkscreened on or otherwise disposed in electrical contact with at least a portion of the conductive coating 5 surface. The size, geometry, thickness, and detailed material specifications may be modified based on the requirements or desires for the specific application.
  • the coated article in Fig. 1 is shown as being spaced apart from the light source(s) 9.
  • the coated article essentially is a lens for a luminaire serving, for example, as a chemical and/or environmental barrier therefor (e.g., by reducing the likelihood of condensation, snow, ice, and/or other moisture-related accumulations, as well as serving as a barrier as to dirt, debris, etc.).
  • the coated article in Fig. 1 may be laminated to the light source(s) 9. Any suitable laminate may be used.
  • EVA, PVB, and/or any other suitable interlayer may be used in different embodiments of this invention.
  • the conductive coating 5 may be supplemented or replaced by making the interlayer heatable. This may be accomplished in certain example instances by, for example, running a tungsten wire or other element through a suitable thermally conductive material.
  • the heatable lens may be an "active" coating in the sense that it is actively powered by an external power source.
  • This external power source may, for example, provide constant heating in some implementations.
  • the glass may be kept at a constant temperature, e.g., by utilizing a controller and a temperature gauge.
  • the external power source may be manually and/or automatically actuatable.
  • the power source may be connected to one or more sensors and a controller. The controller may cause heating to be initiated when the temperature drops below a certain threshold; when a vision and/or condensation sensor detects rain, snow, ice, fog, etc., on the surface of the lens, etc.
  • Example condensation and/or light sensors are disclosed in, for example, U.S. Patent Nos. 8,109, 141 ; 8,009,053; 7,830,267; 7,775,103; and 7,504,957, which are hereby incorporated herein by reference in their entireties.
  • the voltage that is applied may provide substantially uniform heating for a predetermined amount of time, or an amount of time sufficient to remove the snow, ice, rain, etc.
  • continuous voltages may be applied.
  • pulsed voltages may be applied, e.g., in accordance with the techniques disclosed in U.S. Patent Nos. 7,964,821 and 7,518,093, which are incorporated herein by reference.
  • the low voltages advantageously do not present a sodium migration problem.
  • the presence of a silicon-inclusive base layer in the multilayer conductive thin film also helps block sodium migration.
  • the AR coating 3 may be any suitable AR coating in different example embodiments of this invention. Suitable AR coatings are described in, for example, U.S. Publication Nos. 201 1 /0157703 and 2012/0057236, as well as U.S. Application Serial No. 12/929,481 , filed on January 27, 201 1. The entire contents of each of these documents is hereby incorporated herein by reference. It is noted that these AR coatings are desirable because they are heat treatable. That is, in certain example embodiments, these AR coatings may substantially maintain their aesthetic qualities and high chemical and mechanical durability, even after exposure to temperatures typically encountered in thermal tempering and/or heat strengthening. These layers may be deposited via sputtering (e.g., Magnetron Sputtering Vacuum Deposition) or the like.
  • sputtering e.g., Magnetron Sputtering Vacuum Deposition
  • the AR coating 3 includes, in order moving away from the substrate, medium, high, and low index layers, and increases light transmission (e.g., reduces reflection) at least in the visible range of 390-750 nra wavelengths. These layers may directly contact one another in certain example instances.
  • the AR coating 3 may be a dielectric type coating in that each of layers is a dielectric layer (i.e., not electrically conductive).
  • the low index layer may be of or include silicon or an oxide thereof (e.g., Si0 2 or other suitable stoichiometry), MgF, or their alloyed oxide and fluoride.
  • the high index layer may be of or include a metal oxide, metal nitride and/or metal oxynitride such as titanium oxide (e.g., Ti0 2 or other suitable
  • the AR coating component of the substrate thus may help increase light transmission and efficiency of the luminaire or lighting system, e.g., by reducing second surface reflection losses.
  • Fig. 2 is a cross-sectional view of an example AR coating in accordance with certain example embodiments.
  • the medium index layer 21 is a bottom layer of the AR coating and has an index of refraction (n) of from about 1 ,60 to 2.0, more preferably from about 1 .65 to 1.9, even more preferably from about 1.7 to 1.8, and most preferably from about 1.7 to 1 .79 (at 550 nm).
  • an ideal refractive index of medium index layer 21 is from about 1.8 to 2.0.
  • the index of refraction of medium index layer 21 is from about 1.65-1.8 at 780 nm.
  • the material(s) comprising medium index layer 21 have desired optical and mechanical properties in the as- deposited state as well as after exposure to temperatures typical in tempering and/or heat treating environments. It will be appreciated that materials such as aluminum oxynitride, though having desired properties in the as-deposited state, may degrade in optical and/or mechanical properties after exposure to temperatures typical in tempering and/or heat treating environments. Aluminum oxynitride may, however, be used in different embodiments of this invention if it can be made to be sufficiently survivable.
  • the medium index layer 21 has a compressive residual stress in both the as-coated and heat-treated states.
  • this compressive residual stress may help to offset the tensile residual stress in the other layer(s) in the stack. In certain instances, this may promote a net compressive stress in the three layer AR stack, which discourages cracking of the coating during the tempering and/or heat treating processes.
  • Medium index layer 21 preferably has a thickness of from about 75 to
  • silicon oxynitride e.g., SiOxNy
  • SiOxNy silicon oxynitride
  • a layer of or comprising silicon oxynitride advantageously has a compressive residual stress in both the as-coated and heat-treated states.
  • a layer of or comprising silicon oxynitride may produce the following advantages: 1) Small color shift (e.g., ⁇ * ⁇ 3 units), after baking in an air environment at times and temperatures ranges typical for glass tempering processes; 2) Little to no appreciable degradation in the desired optical characteristics of the coating after tempering in the visible region of the spectrum; and 3) Little to no appreciable change in the refractive index in the visible portion of the spectrum after exposure to typically tempering environments. Therefore, it has advantageously been found that a layer of or including silicon oxynitride (e.g., SiOxNy) is suitable for use as a medium index layer 21 in a temperable three layer AR coating.
  • silicon oxynitride e.g., SiOxNy
  • the high index layer is the high index layer
  • High index layer 23 has an index of refraction of at least about 2.0, preferably from about 2.1 to 2.7, more preferably from about 2.25 to 2.55, and most preferably from about 2.3 to 2.5 (at 550 nm) in certain example embodiments.
  • an ideal index of refraction of high index layer 23 at 380 nm may be from about 2.7 to 2.9 (and all subranges therebetween).
  • an ideal index of refraction of high index layer 23 at 780 nm may be from about 2.2 to 2.4 (and all subranges therebetween).
  • Lligh index layer 23 preferably has a thickness of from about 5 to 50 nm, more preferably from about 10 to 35 nm, even more preferably from about 12 to 22 nm, and most preferably from about 15 to 22 nm. In certain exemplary
  • the high index layer 23 has a thickness of less than about 25 nm.
  • the material(s) comprising high index layer 23 have a high index of refraction.
  • An example material for use as a high index layer is titanium oxide (e.g., TiOx).
  • titanium oxide has a high tensile residual stress after exposure to temperatures above 300 degrees C.
  • the high tensile stress in this layer is associated with a phase change from amorphous to crystalline, observed between the as-coated and as-heat treated states. This phase change, in certain instances, occurs at a temperature below the maximum temperature of exposure of the coating during a typical tempering and/or heat treating process.
  • the greater the thickness of the titanium oxide-based layer the greater the tensile residual stress.
  • the high tensile residual stress in the titanium oxide-based layer can case an overall large net tensile stress in the three layer stack.
  • the titanium oxide may be stoichiometric Ti0 2 or partially oxygen deficient / sub-stroichiometric TiOx in different embodiments of this invention.
  • other materials including those of or including TiOx may be used in different embodiments of this invention.
  • AR coating including a high index layer of or including titanium oxide comprises other layers (e.g., medium index layer and/or low index layer) having and/or promoting net compressive residual stress after tempering and/or heat treating, in order to offset the high tensile stress of titanium oxide based layer after exposure to high temperatures.
  • the physical thickness of the high index titanium oxide-based layer 23 e.g., of or including TiOx
  • this will advantageously reduce the net tensile stress of the layer, and may promote a net compressive residual stress for the overall coating.
  • the physical thickness of the titanium oxide- based layer is limited, and the other layers are of materials having compressive residual stresses after tempering and/or heat treatment, it has surprisingly been found that a chemically and mechanically durable tempered coated article with good antireflective properties can be achieved.
  • the low index layer is the low index layer
  • Layer 25 is provided over the high index layer 23 of the AR coating 3.
  • Layer 25 has an index of refraction of from about 1.4 to 1.6, more preferably from about 1.45 to 1.55, and most preferably from about 1.48 to 1.52 (at 550 nm) in certain example embodiments.
  • an ideal index of refraction of low index layer 25 at 380 nm may be from about 1.48 to 1.52 (and all subranges therebetween).
  • an ideal index of refraction of low index layer 25 at 780 nm may be from about 1.46 to 1.5 (and all subranges
  • low index layer 25 has a thickness of from about 70 to 130 nm, more preferably from about 80 to 120 nm, even more preferably from about 89 to 109 nm, and most preferably from about 100 to 1 10 nm.
  • the material(s) comprising low index layer 25 have an index of refraction lower than both the medium and high index layers, and in certain example embodiments, the refractive index of low index layer 25 may be less than that of the glass substrate upon which the coating is provided.
  • An example material for use as or in a low index layer is silicon oxide (e.g., SiOx).
  • silicon oxide e.g., SiOx
  • a low index layer based on silicon oxide advantageously has a compressive residual stress in both the as-coated and heat-treated/tempered states.
  • the compressive residual stress in a low index layer based on silicon oxide may help to offset the tensile residual stress in the titanium oxide-based layer.
  • Utilizing a low index layer with compressive residual stress in conjunction with a high index layer with high tensile residual stress helps to promote a net compressive stress in a temperable three layer AR stack in certain example embodiments. This is advantageous in that it may help discourage cracking of the AR coating 3 during tempering and/or heat treating the coated article in certain example embodiments.
  • Example ranges for the thicknesses of each layer are as follows:
  • Table 1 Example Materials/Thicknesses (Fig. 2 Embodiment) Layer Range (nm) More Preferred (nm) Example (nm)
  • the following tables show the as coated to heat treated (HT) color shifts for the single sided AR coatings on low-iron glass. It will be appreciated that the heat treatment processes have a reduced (and sometimes no) appreciable impact on the aesthetic (e.g., reflected color) quality of the coating.
  • the example coatings described herein have purple hues as deposited, for example. The example purple hue is maintained after heat treatment. This is particularly desirable in a number of applications, where aesthetic quality in terms of reflected color is correspondingly desired.
  • Table 3 Example AR Predicted Color Shifts During HT
  • SiO x N y (21) 45-85 nm 50-70 nm 60-61 nm
  • optical characteristics e.g., AR v i S , AT V i S , ⁇ *
  • AR v i S , AT V i S , ⁇ * optical characteristics between the as deposited and tempered states may be further reduced by adjusting the physical thickness of all the layers in the stack (e.g., the medium, high, and low) in order to shift the spectral curve while maintaining the desired spectral bandpass.
  • any layer stack arranged to have glass/medium/high/low, glass/high/low, high/low alternating, etc., index layers may be used, provided that it supplies suitable optics, e.g., matched to the desired application.
  • a layer comprising NbOx may replace a layer comprising TiOx.
  • the bottom layer comprising SiOxNy may be considered a barrier layer and, as such, it may be replaced with materials, provided that such materials do not interfere with the overall optics of the AR layer stack.
  • the conductive coating 5 shown therein may in some instances be a durable sputter-deposited heat treatable coating. Suitable conductive coatings are disclosed in, for example, U.S. Publication No.
  • the conductive coating 5 may, for example, include a multilayer thin film stack as shown, for example, in Fig. 3.
  • the conductive coating 5 includes a layer comprising a transparent conductive oxide (TCO) 33, sandwiched between an undercoat layer 31 and an overcoat layer 35.
  • TCO inclusive layer 33 may have a refractive index of 1.7-2.1 at 550 nm.
  • the TCO inclusive layer 33 may have an index of refraction of 1.9, e.g., in cases where it comprises indium tin oxide (ITO).
  • ITO indium tin oxide
  • the sheet resistance of the TCO inclusive layer may be between 10-30 ohms/square in certain example embodiments. Its physical thickness preferably is 50- 500 nm, more preferably 75-250 nm, and still more preferably 100-170 nm.
  • the undercoat 31 and the overcoat 35 may be of or include an oxide and/or nitride of silicon. For instance, as shown in the Fig. 3 example, the undercoat 31 and the overcoat 35 each comprise SiOxNy.
  • the undercoat 31 and the overcoat 35 may have an index of refraction preferably of 1.45-2.10, and 1.7 as an example, at 550 nm.
  • the optical extinction coefficient may be close to 0 (e.g., ⁇ 0.01 ) at 550 nm.
  • the physical thickness of such layers preferably is 5-500 nm, more preferably 25-250 nm, and still more preferably 55-125 nm. It will be appreciated that, in certain example embodiments, the coating layer thickness may be tuned based on the voltage supplied and the size of the substrate to arrive at a desired temperature or temperature range (e.g., 40 degrees C in 20 degrees C, ambient).
  • Example thicknesses and indices of refraction for each of the layers is provided in the table that follows:
  • variants of this layer stack are possible in different embodiments of this invention.
  • Such variants may include, for example, using partially or fully oxided and/or nitrided layers for the first and/or second silicon-inclusive layers, W adding a protective overcoat comprising ZrOx, adding one or more index matching layers (e.g., comprising TiOx) between the glass substrate and the second silicon- inclusive layer, etc.
  • W adding a protective overcoat comprising ZrOx
  • adding one or more index matching layers e.g., comprising TiOx
  • certain example embodiments may involve modifying the Fig.
  • the Fig. 3 example embodiment advantageously is very durable, e.g., after heat treatment, even though it does not include an overcoat layer comprising ZrOx or the like (although a ZrOx inclusive or other overcoat layer(s) may be provided in certain example embodiments, as indicated above).
  • the Fig. 3 example layer stack is particularly well-suited for use in an assembly similar to that shown in Fig. 1.
  • the Fig. 3 example layer stack is heat treatable in certain example embodiments. Such heat treatment may be accomplished using an infrared (IR) heater, a box or other furnace, a laser annealing process, etc.
  • IR infrared
  • the table that follows includes performance data for the monolithic Fig, 3 layer stack post-belt furnace heat treatment (e.g., at 650 degrees C).
  • conductive coatings have been described above, other variations are possible.
  • a conductive layer stack of glass/ITO/Si-inclusive layer may be provided.
  • Other overcoats may be provided, e.g., to protect the ITO from over-oxidation during heat treatment.
  • silver, aluminum-doped zinc oxide, pyrolytically deposited fluorine-doped tin oxide, and/or other materials may be used, e.g., if they are provided at a suitable thickness.
  • TCOs zinc-based transparent conductive oxides
  • ITO/Ag/ITO, AZO/ITO, and/or other layer stacks may be provided.
  • the overcoat may be tuned to help improve visible transmission when other materials (e.g., that do not have as high a visible transmission as ITO or where increased thicknesses are desirable for conductivity purposes) are used.
  • SnO:F and an overcoat layer comprising SiOx with a refractive index of 1.45-1.52 may help provide visible transmission greater than 87%, especially if an AR coating is provided on an opposite major surface.
  • a post deposition heat treatment step may be advantageous in helping to re-crystallize the ITO layer and in helping to achieve the desired emissivity and optics (e.g., including those described above).
  • the tempered glass assembly e.g., the substrate 1 including the AR coating 3 and the conductive coating 5
  • the assembly may meet the tempering requirements of ASTM C I 048, as well as the impact resistance requirements of ANSI Z97.1.
  • the assembly may be designed to support up to a 10 psi internal pressure load.
  • the assembly also preferably is able to withstand temperature conditions of from about -55°C to +55°C.
  • the thermal shock requirements of MIL-C-7989, and the glass may reach a maximum operating temperature of 120°C in some cases.
  • the assembly also may be structured to handle an input power load of up to 100 VAC/DC.
  • VAC/DC input power load
  • the operating power density in certain example may be, for example, 1 -6 W/in .
  • the substrates may be glass substrates, e.g., soda lima silica substrates, or low-iron substrates.
  • the thicknesses may be, for example, 1.0-10.0 mm, more preferably 3.0-6.0 mm.
  • Low-iron glass is described in, for example, U.S. Patent Nos. 7,893,350; 7,700,870; 7,557,053; 6,299,703; and 5,030,594, and U.S. Publication Nos. 2006/0169316; 2006/0249199; 2007/021 5205;
  • An exemplary soda-lime-silica base glass according to certain embodiments of this invention includes the following basic ingredients:
  • glass herein may be made from batch raw materials silica sand, soda ash, dolomite, limestone, with the use of sulfate salts such as salt cake (Na 2 S0 4 ) and/or Epsom salt (MgS0 4 x 7H 2 0) and/or gypsum (e.g., about a 1 : 1 combination of any) as refining agents.
  • soda-lime- silica based glasses herein include by weight from about 10-15% Na 2 0 and from about 6-12%o CaO.
  • the glass batch includes materials (including colorants and/or oxidizers) which cause the resulting glass to be fairly neutral in color (slightly yellow in certain example embodiments, indicated by a positive b* value) and/or have a high visible light transmission. These materials may either be present in the raw materials (e.g., small amounts of iron), or may be added to the base glass materials in the batch (e.g., antimony and/or the like).
  • the resulting glass has visible transmission of at least 75%, more preferably at least 80%, even more preferably of at least 85%, and most preferably of at least about 90% (sometimes at least 91%) (Lt D65).
  • the glass and/or glass batch comprises or consists essentially of materials as set forth in Table 9 below (in terms of weight percentage of the total glass composition):
  • the antimony may be added to the glass batch in the form of one or more of Sb 2 0 3 and/or NaSb0 . Note also Sb(Sb 2 0 5 ).
  • the use of the term antimony oxide herein means antimony in any possible oxidation state, and is not intended to be limiting to any particular stoichiometry.
  • the glass Due to the antimony (Sb), the glass is oxidized to a very low ferrous content (% FeO) by combinational oxidation with antimony in the form of antimony trioxide (Sb 2 0 3 ), sodium antimonite (NaSb0 3 ), sodium pyroantimonate (Sb(Sb 2 Os)), sodium or potassium nitrate and/or sodium sulfate.
  • the composition of the glass substrate 1 includes at least twice as much antimony oxide as total iron oxide, by weight, more preferably at least about three times as much, and most preferably at least about four times as much antimony oxide as total iron oxide.
  • the colorant portion is substantially free of other colorants (other than potentially trace amounts).
  • the glass composition is substantially free of, or free of, one, two, three, four or all of: erbium oxide, nickel oxide, cobalt oxide, neodymium oxide, chromium oxide, and selenium.
  • substantially free means no more than 2 ppm and possibly as low as 0 ppm of the element or material.
  • the total amount of iron present in the glass batch and in the resulting glass, i.e., in the colorant portion thereof, is expressed herein in terms of Fe 2 0 3 in accordance with standard practice. This, however, does not imply that all iron is actually in the form of Fe 2 0 3 (see discussion above in this regard). Likewise, the amount of iron in the ferrous state (Fe 2+ ) is reported herein as FeO, even though all ferrous state iron in the glass batch or glass may not be in the form of FeO.
  • iron in the ferrous state (Fe 2+ ; FeO) is a blue-green colorant
  • iron in the ferric state (Fe 3+ ) is a yellow-green colorant
  • the blue-green colorant of ferrous iron is of particular concern, since as a strong colorant it introduces significant color into the glass which can sometimes be undesirable when seeking to achieve a neutral or clear color.
  • resulting glasses according to certain example embodiments of this invention may be characterized by one or more of the following transmissive optical or color characteristics when measured at a thickness of from about 1 mm - 6mm (most preferably a thickness of about 3-4 mm; this is a non-limiting thickness used for purposes of reference only) (Lta is visible transmission %). It is noted that in the table below the a* and b* color values are determined per 111. D65, 10 degree Obs. Table 10: Glass Characteristics of Certain Example Embodiments
  • the conductive coating on a standard 3 mm standard soda lime silica glass substrate together may have a visible transmission of preferably at least 75%, more preferably at least 80%>, still more preferably at least 85%o, and sometimes even 87% or higher. These values may be boosted by about 4% points when the AR coating is provided, e.g., such that when, both are provided on a standard 3 mm standard soda lime silica glass substrate, the assembly may have a visible transmission of preferably at least 79%o, more preferably at least 84%o, still more preferably at least 89%>, and sometimes even 91% or higher.
  • the transmission increase preferably is at least about 3.0% points, more preferably 3.5% points, and sometimes at least about 4% points as indicated above.
  • Fig. 4 is a flowchart showing an illustrative process for making the heatable substrate of Fig. 1 , in accordance with certain example embodiments.
  • a substrate is provided in step S401.
  • steps S403 and S405 the AR coating and conductive coatings are disposed on opposing major surfaces of the substrate, respectively. In some cases, it may be desirable to provide the AR coating on the "tin side" of the glass substrate, e.g., such that residual or higher amounts of tin thereon effectively helps with index matching / overall optics.
  • the substrate may be cut or sized, e.g., into multiple units, etc.
  • the coatings may be removed from edge portions via an edge deletion process (such as, for example, grinding or the like).
  • the substrate may be heat treated (e.g., heat strengthened and/or thermally tempered) in step S41 1.
  • the heat treated article then may be connected to a luminaire and/or built into a lighting system in step S413.
  • Part of the "installation" or final or near-final assembly process may include, for example, disposing a gasket or other mounting features on the substrate. Edge deletion proximate to contact areas for the gasket or other mounting features may be advantageous, in that the heat generated sometimes may melt or otherwise damage the gasket or other mounting features.
  • steps S403 and S405 may be reversed, edge deletion may take place after tempering, etc. It also will be appreciated that some steps may be completely removed and that others may be added in some instances. For example, edge deletion is not always required, a conductive coating need not necessarily be formed if a conductive laminate is provided, etc. In still other cases, these steps may be performed by one or more parties. For instance, a stock sheet may be coated by a first manufacturer, e.g., that performs steps S403 and S405, and it may be cut or sized and/or tempered by a separate party. Still another party, perhaps a fabricator, may connect a heat treated substrate to a luminaire or other lighting system. Thus, the process may include various shipment steps that are not expressly shown therein but instead should be understood from this description.
  • the AR and the conductive coatings may be sputter deposited and heat treatable.
  • the conductive coating may be a sputtered heat treatable coating
  • the AR coating may be a sputtered (and non-heat treatable coating), a wet-applied or other coating, etc.
  • any suitable coating technique and/or layer stack may be used for the AR and conductive coatings.
  • Fig. 5 is a cross-sectional view of an example heatable arrangement in accordance with certain example embodiments.
  • Fig. 5 is similar to the Fig. 1 design.
  • first and second substrates la and lb are laminated to one another via a laminating interlayer 51 (e.g., of or including EVA, PVB, and/or the like).
  • the first substrate l a may support the antircflective coating 3, whereas the second substrate lb may support the conductive coating 5.
  • the example arrangement shown in Fig. 5 may be desirable in some instances, e.g., if a single tempered glass substrate is insufficiently strong for the desired application, and/or yet higher impact resistance is desired.
  • Fig. 6 is a flowchart showing an illustrative process for making the heatable arrangement of Fig. 5, in accordance with certain example embodiments.
  • Fig. 6 is similar to Fig. 4, except that first and second substrates are provided in step S401 '.
  • the AR coating is disposed on the first substrate in step S403,' and the conductive coating is disposed on the second substrate in step S405' .
  • Much of the process is the same, except that in step S412, an interlayer is inserted between the first and second substrates (e.g., with the coatings facing outwardly), and the substrates are laminated together.
  • the coated articles described herein may or may not be heat-treated (e.g., tempered) in different example embodiments.
  • Such tempering and/or heat treatment typically requires use of temperature(s) of at least about 580 degrees C, more preferably of at least about 600 degrees C and still more preferably of at least 620 degrees C.
  • the terms "heat treatment” and “heat treating” as used herein mean heating the article to a temperature sufficient to achieve thermal tempering and/or heat strengthening of the glass inclusive article.
  • This definition includes, for example, heating a coated article in an oven or furnace at a temperature of at least about 550 degrees C, more preferably at least about 580 degrees C, more preferably at least about 600 degrees C, more preferably at least about 620 degrees C, and most preferably at least about 650 degrees C for a sufficient period to allow tempering and/or heat strengthening. This may be for at least about two minutes, or up to about 10 minutes, in certain example embodiments.
  • peripheral and edge do not mean the absolute periphery or edge of the substrate, unit, etc., but instead mean at or near (e.g., within about two inches) an edge of the same.
  • a lens for a lighting system is provided.
  • a glass substrate supports antireflective and transparent coatings on first and second major surfaces thereof, respectively.
  • At least one bus bar is in electrical communication with the conductive coating, with the at least one bus bar being configured to convey voltage to the conductive coating from an external power source to, in turn, cause the conductive coating to heat up.
  • the antireflective and transparent coatings are sputtered coatings.
  • the substrate is heat treated together with the antireflective and transparent coatings thereon.
  • the antireflective coating may comprise, in order moving away from the substrate: a layer comprising silicon oxynitride; a layer comprising titanium oxide; and a layer comprising silicon oxide.
  • the antireflective coating may provide a visible transmission increase of 4% points, compared to a situation where no antireflective coating is provided.
  • the lens may have a visible transmission of at least 87%.
  • the conductive coating may comprise, in order moving away from the substrate, a layer comprising a transparent conductive oxide (TCO), and a silicon-inclusive overcoat.
  • TCO transparent conductive oxide
  • the antireflective coating may comprise, in order moving away from the substrate, high and low refractive index layers.
  • the conductive coating may comprise a layer comprising a transparent conductive oxide (TCO) sandwiched between first and second layers comprising silicon oxynitride.
  • TCO transparent conductive oxide
  • the TCO may be indium tin oxide.
  • the layer comprising the TCO may have an index of refraction of 1.7-2.1 at 550 nm.
  • the layer comprising the TCO may have a sheet resistance of 10-30 ohms/square and a physical thickness of 100-170 nm.
  • the first and second layers comprising silicon oxynitride each may have refractive indexes of 1.45-2.10 at 550 nm, and an extinction coefficient k of ⁇ 0.01 at 550 nm.
  • the physical thicknesses of the first and second layers comprising silicon oxynitride may be 55-125 nm.
  • the first and second layers comprising silicon oxynitride each may have refractive indexes of 1.7 +/- 0.2 at 550 nm, and the layer comprising the TCO may have a refractive index of 1.9 +/- 0.1 at 550 nm.
  • the heat treatment may be thermal tempering.
  • a lighting system is provided.
  • One or more solid state lights are included.
  • the lens of any one of the previous fourteen paragraphs may be interposed between the one or more solid state lights and a viewer of the lighting system.
  • a power source is operable to drive the conductive coating of the lens at a power density of 1 -6 W/in 2 .
  • the one or more solid state lights may comprise an array of organic and/or inorganic light emitting diodes.
  • the lens may be spaced apart from the one or more solid state lights.
  • a lighting system is provided.
  • One or more solid state lights are included.
  • a lens is spaced apart from the one or more solid state lights, with the lens comprising: a first glass substrate supporting a sputter- deposited antireflective coating on a major surface thereof; and a second glass substrate supporting a sputter-deposited conductive coating on a major surface thereof, the first and second substrates being laminated to one another such that coated surfaces thereof face away from one another.
  • the first substrate with the antireflective coating thereon and/or the second with the conductive coating thereon is/are heat treated.
  • a method of making a heatable lens for a lighting system is provided.
  • a multilayer antireflective coating is sputtering deposited on a first major surface of a glass substrate.
  • a multilayer conductive coating is sputtering deposited on a second major surface of the glass substrate, with the first and second major surfaces being opposite one another.
  • the glass substrate with the multilayer antireflective and conductive coatings thereon is heat treated.
  • At least one bus bar is disposed on the glass substrate such that the at least one bus bar is in electrical communication with the conductive coating so as to heat the substrate when voltage is provided from an external power source.
  • the antireflective coating may comprise, in order moving away from the substrate: a layer comprising silicon oxynitride; a layer comprising titanium oxide; and a layer comprising silicon oxide.
  • the conductive coating may comprise a layer comprising a transparent conductive oxide (TCO) sandwiched between first and second layers comprising silicon oxynitride.
  • TCO transparent conductive oxide
  • the layer comprising the TCO may have a sheet resistance of 10-30 ohms/square and a physical thickness of 100-170 nm.
  • the physical thicknesses of the first and second layers comprising silicon oxynitride may be 55-125 nm.
  • the first and second layers comprising silicon oxynitride each may have refractive indexes of 1.7 +/- 0.2 at 550 nm and an extinction coefficient k of ⁇ 0.01 at 550 nm, and the layer comprising the TCO may have a refractive index of 1.9 +/- 0.1 at 550 nm.
  • the heat treatment is thermal tempering.
  • a method of making a lighting system is provided.
  • a lens is made in accordance with the method of any of the previous seven paragraphs, for example.
  • a solid state light source is provided.
  • the lens is provided in spaced apart relation to the light source.
  • the at least one bus bar of the lens is connected to an external power source.

Abstract

La présente invention se rapporte, selon certains modes de réalisation donnés à titre d'exemple, à des substrats de verre qui peuvent être chauffés et utilisés en liaison avec des applications d'éclairage et/ou à des procédés de fabrication de ces substrats. Selon certains modes de réalisation donnés à titre d'exemple, un substrat de verre supporte un revêtement antireflet sur une première surface principale de ce dernier, et un revêtement conducteur sur une seconde surface principale opposée de ce dernier. Des barres omnibus raccordent, dans certains modes de réalisation donnés à titre d'exemple, le revêtement conducteur à une source d'énergie. Le substrat peut être traité thermiquement (par exemple, renforcé thermiquement et/ou trempé thermiquement), un ou plusieurs revêtements étant agencés sur ce dernier. Le substrat de verre pouvant être chauffé peut donc aider à fournir une barrière chimique et/ou environnementale pour le luminaire ou le système d'éclairage disposé derrière lui. De plus, ou en variante, le substrat de verre pouvant être chauffé peut aider à réduire la quantité d'humidité (par exemple, la neige, la pluie, la glace, le brouillard, etc.) qui, sinon, s'accumulerait sur le luminaire ou le système d'éclairage.
EP13717913.1A 2012-04-02 2013-04-02 Lentille pouvant être chauffée pour luminaires et/ou sa procédée de fabrication Withdrawn EP2834557A2 (fr)

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US13/437,384 US8939606B2 (en) 2010-02-26 2012-04-02 Heatable lens for luminaires, and/or methods of making the same
PCT/US2013/034927 WO2013151984A2 (fr) 2012-04-02 2013-04-02 Lentille pouvant être chauffée pour luminaires et/ou procédés de fabrication de cette dernière

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