US20110296726A1 - Laminate structure with embedded cavities and related method of manufacture - Google Patents

Laminate structure with embedded cavities and related method of manufacture Download PDF

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Publication number
US20110296726A1
US20110296726A1 US13/080,897 US201113080897A US2011296726A1 US 20110296726 A1 US20110296726 A1 US 20110296726A1 US 201113080897 A US201113080897 A US 201113080897A US 2011296726 A1 US2011296726 A1 US 2011296726A1
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function
laminate structure
surface relief
structure according
integrated laminate
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Kari Rinko
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Nitto Denko Corp
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Individual
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Assigned to CREAOPTO OÜ reassignment CREAOPTO OÜ ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: RINKO, KARI
Assigned to NITTO DENKO CORPORATION reassignment NITTO DENKO CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CREAOPTO OÜ
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V5/00—Refractors for light sources
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00—Producing optical elements, e.g. lenses or prisms
    • B29D11/0074—Production of other optical elements not provided for in B29D11/00009- B29D11/0073
    • B29D11/00788—Producing optical films
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00—Producing optical elements, e.g. lenses or prisms
    • B29D11/00009—Production of simple or compound lenses
    • B29D11/00317—Production of lenses with markings or patterns
    • B29D11/00346—Production of lenses with markings or patterns having nanosize structures or features, e.g. fillers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00—Producing optical elements, e.g. lenses or prisms
    • B29D11/0073—Optical laminates
    • 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
    • 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
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • 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
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/142—Laminating of sheets, panels or inserts, e.g. stiffeners, by wrapping in at least one outer layer, or inserting into a preformed pocket
    • 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
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/06—Embossing
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/42—Coupling light guides with opto-electronic elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/02—Details
    • H01L31/0236—Special surface textures
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
    • H01L31/042—PV modules or arrays of single PV cells
    • H01L31/048—Encapsulation of modules
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
    • H01L31/054—Optical elements directly associated or integrated with the PV cell, e.g. light-reflecting means or light-concentrating means
    • H01L31/0543—Optical elements directly associated or integrated with the PV cell, e.g. light-reflecting means or light-concentrating means comprising light concentrating means of the refractive type, e.g. lenses
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
    • H01L31/054—Optical elements directly associated or integrated with the PV cell, e.g. light-reflecting means or light-concentrating means
    • H01L31/0547—Optical elements directly associated or integrated with the PV cell, e.g. light-reflecting means or light-concentrating means comprising light concentrating means of the reflecting type, e.g. parabolic mirrors, concentrators using total internal reflection
    • 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
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/14—Printing or colouring
    • B32B38/145—Printing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/52—PV systems with concentrators
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/10—Methods of surface bonding and/or assembly therefor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/10—Methods of surface bonding and/or assembly therefor
    • Y10T156/1002—Methods of surface bonding and/or assembly therefor with permanent bending or reshaping or surface deformation of self sustaining lamina
    • Y10T156/1039—Surface deformation only of sandwich or lamina [e.g., embossed panels]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24355—Continuous and nonuniform or irregular surface on layer or component [e.g., roofing, etc.]
    • Y10T428/24364—Continuous and nonuniform or irregular surface on layer or component [e.g., roofing, etc.] with transparent or protective coating
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24479—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness
    • Y10T428/24562—Interlaminar spaces

Definitions

  • the invention pertains to optics.
  • the invention concerns laminate structures with embedded, optically functional cavities and manufacturing thereof.
  • microstructures such as microprisms or gratings, of different optics-containing devices, such as lighting apparatuses and electronic apparatuses, have been exclusively produced on surface areas of optically transparent substrates.
  • These structures may have been originally configured to (re)direct, couple or otherwise interact with the incident light in a certain predetermined manner, but positioning thereof on the surface of the material has typically caused a number of problems and defects arising, if not immediately, at least in the long term.
  • optically meaningful surface relief structures such as coupling optics are very often subjected, naturally depending on the use scenario, to stress caused by various external factors such as contamination due to dust, sand, water, grease and dirt in general.
  • the surface forms are generally vulnerable to impacts by external objects, which may break, deform and damage these delicate structures of potentially just micrometer or nanometer size, for example. Even the pressure introduced by a purposefully contacted external element may damage the surface structure patterned on the contact surface and hinder the desired function thereof.
  • FIG. 1 a visualizes, particularly in the exemplary context of solar cells, two initial problems that may also occur together in the same use scenario generally incorporating light propagation and medium boundaries.
  • a light source such as the sun and incident 106 on a cover glass 102 of a solar cell 104 with a noticeable angle of incidence
  • the light fraction passed into the cover glass 102 is still further partially reflected internally 110 from the glass-solar cell interface 103 .
  • the corresponding refractive indexes may be n air , n 1 and n 2 for the medium, material of the glass and for the top portion of the cell, respectively.
  • a limited amount of incident light such as the light rays 112 that are substantially perpendicularly incident on the cover glass 102 may thus pass through the cover glass 102 and enter the solar cell 104 without considerable amount of related electromagnetic energy lost due to reflections at the interfaces encountered on the overall optical path. Thereby, the range of incident angles enabling efficient incoupling and total efficiency remains narrow.
  • the outmost layer 102 such as the above cover glass protecting the underlying solar cell 104 and thus being again the first element to receive the incident light, has been provided with a surface relief pattern 114 configured to couple and redirect the light towards the cell 104 within a predetermined angle.
  • the pattern may have been specifically constructed to redirect the light rays 120 more perpendicularly to the cell 104 , for example.
  • the effect of the pattern 114 sooner or later turns out inferior as at least part of the incident light is actually reflected by the contamination 118 and/or is coupled towards the cell 104 in somewhat random angle, which may cause further undesired reflections at the glass-cell boundary 103 and cause reduced overall efficiency of the provided structure.
  • the achieved overall efficiency of the contemporary solutions may be surprisingly low, possibly around 15% or below, greatly due to the contamination-induced reflections and miscoupling, surface reflections, internal reflections, such as reflections at medium boundaries between e.g. ITO (indium tin oxide) layer and other layers commonly applied in the solar cells' optical structures.
  • ITO indium tin oxide
  • Major portion of the sunlight incident on the optical structure including the solar cell is not utilized because certain incident angles are basically disregarded by the conventional optics utilized therewith.
  • the illustrated context of solar energy one could say that only direct sunlight reaching the solar cell vertically adds to the efficiency of the solar cell that is thus extremely sensitive to the sun position.
  • an objective of various embodiments of the invention is to alleviate one or more problems described hereinabove not yet satisfactorily addressed by the current arrangements, and to provide a feasible alternative for producing various functional structures such as optically functional structures.
  • an integrated laminate structure adapted for application in the context of solar technology, wafer technology, cooling channels, greenhouse illumination, window illumination, street lighting, traffic lighting, traffic reflectors or security films may include
  • either or both the carrier elements include optically substantially transparent material, but in some embodiments at least one of the elements may be optically substantially non-transparent and/or include non-transparent material depending on the particular use scenario in question. It may be e.g. opaque or translucent.
  • the laminated elements are securely joined together by lamination so that no undesired gaps such as air gaps, naturally excluding the desired, typically optically functional cavities created by the at least one embedded surface relief pattern, remain therebetween.
  • a surface relief pattern or form of a carrier element when embedded during lamination, it does not appear on the surface of the constructed laminate structure and is not a surface relief pattern or form of the structure.
  • the patterned laminate layers with the same refractive index may form a single element in terms of optical function relative to light incident thereon.
  • the first carrier element may be provided with at least one surface relief pattern having a predetermined optical function relative to light incident thereon and including a number of surface relief forms.
  • the pattern may be on the side facing the second carrier element upon and after lamination (embedded), or on the opposite side, for example. In the latter case, the pattern may remain on the surface of the structure or be covered e.g. by a further element and be thus embedded.
  • the patterns of the first and second carrier elements may form an aggregate multilayer pattern having at least one common function, for example.
  • a carrier element, such as the first or second carrier element may generally be substantially planar, but also other shapes are possible.
  • the at least one surface relief pattern of the second carrier and/or of the first carrier element preferably embedded within the laminate structure may indeed be configured to define a number of preferably optically functional cavities therein optionally together with the facing portion of the first carrier and/or second element, respectively, at the interface thereof.
  • An embedded, closed cavity may be e.g. a micro-cavity or a nano-cavity as to the size thereof.
  • the cavities may contain a number of materials potentially different from the materials of the first and/or second carrier elements.
  • a cavity may include or be filled with fluid such as air, suitable liquid, and/or solid.
  • a cavity may include gel.
  • Ink may also be applied. Ink may be transparent or colored.
  • the substances may have been selected so as to provide a predetermined optical performance in terms of e.g. refractive index.
  • the refractive index may differ from the one of the associated carrier element, or it may be the same.
  • a cavity may have a dot-like, an elongated or a more complex shape, for example.
  • the at least one, optionally optical function of a utilized, potentially embedded, surface relief pattern including a number of surface relief forms may include a function selected from the group of: light directing function, light trapping function, reflective function, transmissive function, transreflective function, coupling function, incoupling function, outcoupling function, polarizing function, diffractive function, refractive function, anti-glare function, anti-clear function, anti-reflection function, collimating function, pre-collimation function, lens function, converging function, diverging function, wavelength modifying function, scattering function, coloring function, medium distribution function, and diffusing function.
  • one or more functions may be achieved with the established related cavities at the element interfaces.
  • the interfaces or predetermined portion thereof may be made optically transparent with e.g. proper selection of refractive indexes (same), if desired.
  • a plurality of surface relief forms of the pattern may bear the same function.
  • different forms of the pattern may bear different functionalities.
  • a single form may provide several, at least two, functionalities.
  • the same pattern or even a form may be configured to transmissively couple light and, on the other hand, reflect light, for instance.
  • the functionality may depend on the nature, such as incident angle and/or wavelength, of light, and/or on the side of the form the light is incident on, for example.
  • a surface relief form which may be either embedded or not, may be configured for a predetermined number of functions by properly selecting the associated material (contour material and fill material), dimensions, position and/or alignment, for instance.
  • the laminate structure may include a third and optionally a number of subsequent carrier elements. These may include further surface relief patterns thereon.
  • the surface relief patterns may be embedded within the laminate structure.
  • Any of the first, second or optional further elements may be a laminate or other type of multi-layer and/or multi-portion element.
  • a middle element may be thicker than the surrounding top and bottom elements such as films that may be provided with a number of surface relief patterns to be optionally embedded, for instance. Also, the middle element may be provided with a surface relief pattern that is embedded within the laminate during the manufacturing of the laminate structure.
  • the integrated laminate structure may include a plurality of layers of (originally) surface relief patters.
  • Each laminated element such as a film, foil or sheet, may include one or more surface relief patterns and construct one or more optically functional layers, respectively.
  • Each layer may have a dedicated optical functionality or several functionalities.
  • a multi-layer pattern may be formed by a single carrier element initially having a layer of surface relief forms on both sides thereof, and/or a plurality of carrier elements, each provided with at least one layer of surface relief forms, may be utilized to collectively form the multi-layer pattern.
  • the layers of the multi-layer pattern may have at least one collective function.
  • the first and/or second carrier element is substantially flexible and bendable.
  • the degree of flexibility and bendability may differ embodiment-wise. For instance, a predetermined bend, e.g. 180 degrees, may be achieved with a predetermined bend radius without material breakage.
  • Further carrier elements may be flexible and bendable as well.
  • the laminate structure may be flexible and also bendable.
  • the carrier element may be thin such as a thin film.
  • the thickness of a carrier element may also vary depending on the embodiment. It may be just a few nanometers up to several millimeters thick, for example. The above applies also to further carrier elements of the laminate structure. However, clearly thicker element(s) may be alternatively used.
  • the first and/or second carrier element includes plastic material such as polymer or elastomer, glass and/or ceramic material. Additionally or alternatively, other material(s) such as semiconductor materials, e.g. silicon or silicon wafer, may be used.
  • a surface relief pattern to be optionally embedded may include a number of surface relief forms defining at least one entity selected from the group including: a grating, a grating groove, a binary shape, a slanted shape, a quadratic or rectangular shape, a triangular shape, a trapezoidal shape, a pixel, a grating pixel, a protrusion, a recess, a hollow, and a lens shape.
  • the laminate structure may include or form at least part of a transmissive, reflective or transreflective element.
  • the laminate structure may include or may be provided with a functional surface layer, such as a coating and/or a layer including surface relief forms. These forms may indeed remain on the surface of the laminate structure.
  • the function, or “property”, thereof may include anti-reflection function, hydrophobic function, hydrophilic function, and/or self-cleaning function, for example.
  • the laminate structure may contains, establish or may be included in an indicative element and/or layer, or it is at least disposed on top of one. It may include an indicative surface such as an indicative sign, a poster or a plate.
  • the indicative window or display may be passive. It may contain one or more symbols, numbers and/or letters.
  • the shown data may be substantially informative, such as traffic signs, warning signs or register plates, and/or commercial such as advertising data by nature. Data indication may have been actualized using optionally embedded surface relief forms to establish, via cooperation with the light coupled therewith, the predetermined visual message, and/or by printing on the surface.
  • the element and the data indicated therewith may be controllable by electronics, for example.
  • the laminate may have e.g. a light-providing or -directing function in that scenario.
  • a surface relief form and/or related pattern to be embedded in or be otherwise provided to the laminate structure may substantially be of submicron size regarding the length, depth/height and/or width thereof.
  • the size of the form and/or pattern may be few microns or several tens of microns, e.g. about 20 or about 30 microns up to a number of millimeters. Even larger sizes may be applied.
  • an embodiment of method for constructing an integrated structure for optical applications in the context of solar technology, wafer technology, cooling channels, greenhouse illumination, window illumination, street lighting, traffic lighting, traffic reflectors or security films may include
  • Embedding the at least one surface relief pattern may practically cause a number of related cavities to be located substantially at the associated interface of the first and second carrier elements in the laminate. A portion of the cavity edges may be thus defined by the facing surface layer of the first carrier element.
  • a roll-to-roll procedure may be applied in the method.
  • a roll-to-roll procedure such as roll-to-roll embossing or roll-to-roll imprinting, may be applied for establishing the surface relief pattern on a carrier element.
  • a surface relief pattern could be formed utilizing e.g. at least one technique selected from the group consisting of: embossing, imprinting, micromachining, UV embossing, UV imprinting, lithography, micro-molding, and casting.
  • the lamination process may utilize roll-to-roll or planar processing technology.
  • a carrier element such as the second carrier element, may be provided by at least one surface relief pattern such that a pre-master element, e.g. a pre-master plate including a pre-mastering pattern, is first formed utilizing a suitable technique such as electroforming, casting or molding, for example.
  • a master element such as a nickel shim, plastic master plate, cast material plate, or a molded plate, may be formed based on the pre-master element.
  • the pattern(s) of the pre-master element may be modulated by a suitable technique such as printing. Drop filling by inkjet device may be applied for modulation, for instance, such that ink-filled portions of the pre-master do not appear as such in the target element, i.e. the master element.
  • both simple and very complex high performance, integrated nano- or micro-scale structures with various functionalities such as optical structures, fluidic structures (e.g. channels), cooling structures, or lubricant structures, may be embedded within a laminate structure including at least two elements defining at least two layers attached together.
  • the utilized lamination technique may be selected so that the attachment is secure and/or there substantially remain no (unintended) gaps between the laminated elements.
  • Further integrated elements, layers or coatings may be provided on any side of the obtained laminate.
  • the laminate structure may be manufactured with a relatively simple and low cost industrial scale method. Yet, the embedded structures of the laminate remain protected from external impulses and contamination. Service life of the related products is extended and many of them may be practically maintenance-free.
  • multilevel/layer embedded structures may be easily constructed.
  • Internal light-trapping structures utilizing e.g. specific geometrics, refractive indexes and/or materials may be provided for internally reflecting light.
  • Light capture layers effectively capturing and collimating light with a wide range of incident angles may be implemented.
  • the laminate may be applied in connection with integrated electronics, semiconductors, (bio)medical systems, tribological systems, windows, such as window lighting, solar cells, green house illumination, advertising, security applications, automotive and generally vehicle industry, street lighting, general lighting and various signs or plates, such as traffic signs and luminous tags, for instance.
  • the solar cell may remain static and implementing a module configured to adjust the alignment thereof is unnecessary despite the increased efficiency.
  • the laminate structure attached to the solar cell may be further provided with additional functionalities and layers such as self-cleaning nanostructures, coatings etc. Larger functional surfaces may be constructed. Rigid or flexible solar cell structures may be considered.
  • a number of refers herein to any positive integer starting from one (1), e.g. to one, two, three or more.
  • a plurality of refers herein to any positive integer starting from two (2), e.g. to two, three, four or more.
  • first and second do not denote any order, quantity, or importance, but rather are used to distinguish one element from another.
  • light refers to electromagnetic radiation, such as visible light, but being not limited to visible light.
  • carrier element may generally refer herein to an element of the laminate that includes predetermined material, such as material for carrying light, an element that includes a predetermined functional element such as a coating or at least portion of a structure such as a surface relief pattern or a related cavity, and/or an element that supports, carries, protects or is at least fixed to other one or more elements in the finished laminate and therefore forms an integral part of the laminate.
  • FIG. 1 a illustrates various problems associated with contemporary solar cell arrangements.
  • FIG. 1 b illustrates various problems of surface relief structures when subjected to typical use conditions, e.g. outdoors.
  • FIG. 2 is a cross-sectional illustration of an embodiment of the laminate structure in accordance with the invention.
  • FIG. 3 is a cross-sectional illustration of another embodiment of the laminate structure in accordance with the invention.
  • FIG. 4 is a cross-sectional illustration of a further embodiment of the laminate structure in accordance with the invention.
  • FIG. 5 is a cross-sectional illustration of a further embodiment of the laminate structure in accordance with the invention.
  • FIG. 6 is a cross-sectional illustration of a further embodiment of the laminate structure in accordance with the invention.
  • FIG. 7 is a cross-sectional illustration of a laminate structure for a solar cell in accordance with an embodiment of the invention.
  • FIG. 8 is a cross-sectional illustration of a laminate structure for incoupling purposes in accordance with an embodiment the invention.
  • FIG. 9 a is a cross-sectional illustration of a structure for incoupling purposes in accordance with an embodiment of the invention.
  • FIG. 9 b is a cross-sectional illustration of two other embodiments for incoupling purposes in accordance with the invention.
  • FIG. 10 illustrates manufacturing an embodiment of the laminate structure in accordance with the invention.
  • FIG. 11 is a flow diagram disclosing an embodiment of the method of manufacture in accordance with the invention.
  • FIG. 12 illustrates various aspects of potential roll-to-roll manufacturing scenarios.
  • FIG. 13 illustrates selected elements of a manufacturing process resulting in a creation of an embodiment of the laminate structure in accordance with the invention.
  • FIGS. 1 a and 1 b were already contemplated in conjunction with the description of background art.
  • the principles of the invention may be applied in various use scenarios and contexts.
  • the context may relate to the utilization of visible, infrared and/or UV light, for instance.
  • the laminate structure may be produced from bulk elements, such as bulk plates or films. These may be provided with optical patterns having desired optical functions such as coupling, e.g. incoupling or outcoupling, function. Patterns with small surface relief forms, such as gratings, binary, blazed, slanted and/or trapezoidal forms may be utilized. Discrete patterns, such as grating pixels, small recesses, or continuous forms, elongated recesses or channels, basically almost any kind of two or three dimensional forms, may be utilized. Preferably there are at least small flat portions, i.e. contact surfaces, on the laminate junction areas (interfaces) to enhance adhesion of the associate laminate layers and/or to obtain desired light propagation and/or other behavior.
  • optical patterns having desired optical functions such as coupling, e.g. incoupling or outcoupling, function.
  • Patterns with small surface relief forms such as gratings, binary, blazed, slanted and/or trapezoidal forms may be utilized.
  • the embedded surface relief pattern may form and be considered to include a number of closed cavities, such as micro-cavities filled with air or other medium on the junction area. Also, a number of larger structures such as refractive structures may be established. Accordingly, the cavities are typically optically functional and have at least one predetermined optical function.
  • a surface relief form/pattern to be embedded one shall naturally contemplate the functionality of the form/pattern as embedded in the laminate such that the surrounding laminate materials, shapes and forms, established cavities at the interfaces, etc. are properly taken into account as to their e.g. optical effect.
  • the outmost laminate element when in use, may contain integral light coupling optics, such as incoupling optics, outcoupling optics and/or polarization gratings, such as wire grid or other grating solutions.
  • the optics may include embedded optics and/or surface optics.
  • a number of light sources may be functionally and/or physically connected to the laminate structure, via edge for example, using suitable optionally laminate- and/or light source-integrated coupling optics such as collimation and/or reflective optics. Bottom coupling is a further possibility.
  • a multilayer such as dual-layer optic structure is implemented by the laminate for coupling or other purposes.
  • a layer or other element of the laminate may be configured for certain wavelength of light such as a certain range of wavelengths.
  • Another layer may be configured for other wavelengths.
  • a surface layer or a layer closer to the surface may be configured for IR (longer wavelength) and another layer residing deeper in the structure for visible light (shorter wavelength), or vice versa.
  • the layer thicknesses may be selected on target wavelength basis. With proper thicknesses, desired layers may be made practically invisible from the standpoint of desired wavelengths.
  • the laminate may incorporate coupling optics, e.g. coupling layers with surface relief patterns, on multiple sides thereof.
  • the laminate structure may be applied in advertising and indicative windows, displays, signs or marks.
  • An optically functional element such as a plate or film, which may be a laminate, may be disposed on top of a target picture or other target element as a separate element or integrated therewith (laminated, for instance). It may contain a surface relief pattern optionally located closer to the picture or the other target element than the opposite surface to enhance contrast.
  • a binary grating or other patterns may be utilized e.g. with a panel element.
  • a binary grating may be desired for larger viewing angle applications and a blazed grating for narrower angle. Hybrid grating solutions are possible as well. Diffusing optics may be utilized for hot spot avoidance and for more uniform illumination.
  • the solution is also applicable to UI solutions and license plates for instance.
  • license plates or other elements with identification or other visual data provided thereon the indicated numbers, letters, etc. may be laminated into contact with a front plate to make number/letter surroundings illuminated, for example, for improved contrast.
  • one or more elements of the laminate structure may be substantially optically transparent, translucent or opaque.
  • the required degree of transparency of each element naturally depends on each particular use case.
  • the preferred transmittance in relation to predetermined wavelengths of light e.g. infrared, visible or uv
  • FIG. 2 depicts one scenario wherein an embodiment of the invention may be applied.
  • the integrated laminate structure 202 includes two planar carrier elements 204 and 206 laminated together. More elements could be added, if needed.
  • the broken line denotes the (ex-)interface between the two laminated elements 204 (hereinafter “top element” due to the location in the figure; in actual use scenarios the physical positioning of the elements in top/outer vs. bottom/inner scale may be the same or e.g. opposite), 206 (hereinafter “bottom element” for the corresponding reason) in the figure.
  • the interface may be optically transparent as described hereinbefore. Few light rays are visualized as solid line arrows in the figure.
  • the top element 204 has been originally provided with a surface relief pattern including a number of protruding surface relief forms 208 on the bottom thereof with corresponding recesses 210 in between.
  • the top element 204 and bottom element 206 which may be considered as a substrate carrier of the top element 204 and a partial substrate for the created cavities defining at least a portion of the walls thereof at the interface of the elements 204 , 206 , have been then laminated together so that the protrusions 208 of the surface relief pattern extending downwards with the shape of e.g.
  • a truncated cone (note cross-sectional form of an isosceles trapezoid in the figure) have contacted the alignment-wise corresponding surface portions of the bottom element 206 having a substantially flat contact surface in the illustrated case.
  • the recesses 210 have formed cavities potentially including material such as air trapped therein unless a vacuum has been provided.
  • the material may thus have a refractive index different from the surrounding material. If the material of the element 204 is plastic, its refractive index is generally higher than the refractive index of air, for instance.
  • n air , n 1 , n 2 of the materials carried by the elements 204 , 206 may have been selected so as to provide a desired functional effect in terms of light propagation. It is illustrated in the figure by the arrows how a number of light rays with different incident angles may be collimated by the applied configuration of laminate layers and surface relief pattern therein to advance towards the bottom of the laminate in substantially perpendicular fashion.
  • the top element 204 may be considered to act as a light capture layer for the underlying one or more elements 206 .
  • the element 204 may be thin, essentially a film, with only e.g.
  • bottom layer 206 The shown or a similar embodiment could be applied in the context of window illumination or solar cells, for instance.
  • FIG. 3 discloses another embodiment 302 with two carrier elements 304 , 306 .
  • the bottom element 306 contains a surface relief pattern 308 with protrusion 308 a and intermediate recess 308 b forms, or “profiles”, on top of which a flat top element 304 has been laminated.
  • the established cavities may contain air and/or some other material(s).
  • FIG. 4 discloses an embodiment 402 in which a plurality of different embedded surface relief forms is configured to form a number of embedded surface relief patterns relative to elements 404 , 406 laminated together.
  • Triangular 408 , trapezoidal 410 and slanted (rectangle or square) 412 forms are shown in the figure.
  • the forms and related patterns may have been configured for outcoupling and/or other type of light redirecting as visualized in the figure by the arrows.
  • Forms of different shape and/or material may be configured so as to provide a common, collective optical function, or they may be utilized for different purposes.
  • a certain embedded surface relief form may have multiple uses depending on e.g. the incident angle and/or face of light.
  • the leftmost triangle form or cavity has both outcoupling and light trapping functionalities, which has been visualized by the two rays.
  • the established cavities may contain air and/or some other material(s).
  • the laminate structure 402 may be disposed on top of and optionally laminated with other element(s) such as an indicative element such as a poster, sign or plate, or with a window, for example. Alternatively, the indicative or other element may be included in the element 406 .
  • FIG. 5 illustrates a further embodiment 502 wherein three carrier elements 504 , 505 , 506 have been laminated together.
  • Each of the elements 504 , 505 , 506 may contain a number of surface relief patterns and/or other features, but in the illustrated extract the bottom element 506 is free from them and merely acts as substrate for the upper elements 504 , 505 .
  • the bottom element 506 may, in some use cases, contain and/or exhibit e.g. indicative data (advertisement data, informative data). It may be a sign or plate with indicative data printed or otherwise constructed thereon, for instance.
  • the middle element 505 includes a surface relief pattern of substantially rectangular (binary) forms 508 , which may (being not visible in the cross-sectional figure) be dot or pixel like forms or longer grooves such as grating grooves or corresponding protrusions.
  • the top element 504 includes a pattern of triangular forms 510 .
  • the top element 504 may form in the laminate at least one optically functional layer the embedded surface relief pattern of which has at least one predetermined function such as incoupling or outcoupling function.
  • the middle element 505 may form at least one other optically functional layer the embedded surface relief pattern of which has potentially other predetermined function such as reflective function.
  • microstructures may be configured regarding a common functionality from the standpoint of a desired functionality, such as predetermined light incoupling or outcoupling property such as collimation or decollimation property.
  • a desired functionality such as predetermined light incoupling or outcoupling property such as collimation or decollimation property.
  • the cavities established by embedded surface relief forms may contain air and/or some other material(s).
  • FIG. 6 discloses a further embodiment 602 wherein the top element 604 of the laminate includes at least one pattern including a number of first, essentially square-shaped, surface relief forms 608 and second, essentially rectangular, surface relief forms 610 on the surface facing the bottom element 606 in the laminate structure.
  • the forms may have similar or different purposes.
  • the first forms 608 may be configured in terms of the utilized material(s), dimensions and/or positioning, for functions such as outcoupling or incoupling whereas the second forms 610 are for reflection, potentially specular reflection.
  • FIG. 7 illustrates a further embodiment especially suitable for the context of solar energy production, i.e. solar power, and solar cells.
  • a carrier element such as a thin film element 702 (the depicted thicknesses and other dimensions are generally not in scale for clarity purposes) potentially configured to act as a light capture element may be provided with a surface relief pattern including a plurality of surface relief forms 708 capable of collimating light (with a narrower distribution) in the laminate structure towards predetermined direction, substantially the direction of the underlying components of the solar cell 706 from a wider range of incident angles of external light, typically sunlight, penetrated through the surface of the element 702 and incident on the pattern.
  • the height/depth of the surface relief forms 708 of the pattern may be about 10 ⁇ m, for instance.
  • the film element 702 and a carrier element 704 that may also act as the cover plastic or glass of the solar cell structure (indeed, often the solar cells are provided with integral cover glass) may be first laminated together and stored and delivered for later joining with the rest 706 of the complete solar cell structure as suggested herein, for example.
  • the solar cell structure 706 potentially stacked below the cover glass 704 may incorporate one or more layers or elements selected from the group including: a back contact, a p type semiconductor, an n type semiconductor, a front contact, transparent adhesive, and anti-reflective coating.
  • the film element 702 may be provided as such onto the solar cell structure having the front glass 704 already in place.
  • the element 702 may be provided between the glass 704 and the rest of the solar cell structure 706 .
  • the glass 704 may be provided with a surface relief pattern.
  • the established cavities 709 may contain air and/or some other material(s) left or specifically disposed therein during the manufacturing process of the laminate structure.
  • the described nano- and microcavity film techniques can be utilized in different layers of a solar cell product 702 b .
  • complex undercut profiles are possible.
  • multi-layers with multi-profiles are suitable as contemplated hereinbefore.
  • An optically functional layer can be produced/applied on the top surface, some internal surface (e.g. to the middle under the glass plate) or directly on the silicon surface/solar cell surface including possible nanoprofile in the silicon/photovoltaic surface to improve light absorption.
  • the optical profiles are preferably fully integrated.
  • reflective and generally “light-trapping” functions 710 , 712 may be achieved by the utilized patterns including cavities, their positioning, alignment and material selections. The light traps may be thus formed without true, reflective mirror surfaces in the carrier material.
  • the solar cell structure suggested herein may provide about 20-40% higher efficiency than the conventional solutions, whereupon the overall efficiency may approach e.g. 40% or 50%. Both rigid and flexible solar cell materials and structures may be applied and constructed.
  • FIG. 8 illustrates an embodiment 801 wherein the light capture film or plate element 802 laminated on the glass 804 protecting the rest 806 of the solar cell has been further provided with a functional surface layer 808 implemented by a specific film, a coating, a surface relief pattern, or any combination of the above and/or other elements, for instance.
  • a number of anti-reflective (AR) and/or self-cleaning (nano)profiles may be utilized to minimize surface reflection and contamination.
  • the AR functionality may preferably enable incoupling sunlight even with very large incident angles relative to the structure surface (normal), such as angles of about 70 or 80 degrees, into the structure from the atmosphere so that the solar cell receives as much light as possible and the efficiency thereof may be maximized. This is indicated in the figure by the arrows 808 b .
  • the embedded surface relief pattern 802 a of element 802 may be then utilized to direct and collimate the incoupled light towards the solar cell 806 .
  • the pattern 802 a may also be designed so as to be capable of coupling a considerable range of incident angles, e.g. a total range of 120, 130, 140, 150 or 160 degrees, as desired.
  • the pattern 802 a may be configured to couple incident light, such as sunlight having entered the structure so that the incident angles properly coupled optionally defining a range of at least about 120, 130, 140, 150 or 160 degrees, and wherein the pattern is configured to couple the incident light with a collimation function substantially towards a predetermined direction of a solar cell.
  • incident light such as sunlight having entered the structure so that the incident angles properly coupled optionally defining a range of at least about 120, 130, 140, 150 or 160 degrees
  • the pattern is configured to couple the incident light with a collimation function substantially towards a predetermined direction of a solar cell.
  • integrated reflectors with micro-cavities may be adopted for solar cell structures, which may improve maintaining the sunlight longer inside the structure, whereupon energy absorption can be potentially improved. Accordingly, the suggested laminate structure may in some embodiments improve the efficiency of the solar cell considerably.
  • the constructed overall solar cell structure including the light capturing or other laminated element may contain multiple, e.g. two, functional, such as anti-reflective, layers. One may be disposed on either side of the cover glass and the other on the other side in connection with the light capture film element such that it preferably receives the external, incident light prior to the light capture film element.
  • the principles described herein may be capitalized in the context of windows or displays.
  • the windows/displays may be used for advertizing, safety or security purposes, for example.
  • a number of embedded reflectors such as nanoreflectors may be manufactured by the techniques presented herein.
  • Small patterns, e.g. grating based reflecting profiles can be laminated directly on e.g. a planar reflector and those small surface relief patterns of laminated elements may be completely embedded, unlike e.g. with conventional retroreflector films.
  • a polarizer may be manufactured in accordance with the principles set forth herein.
  • a grating/wire grid polarizer may be produced optionally by a roll-to-roll method.
  • Basic profiles may be manufactured by applying UV curing and related curable material, for example, after which deposition coating by higher refractive index by laser assisted deposition may be executed on the line. The laser may be used to deposit many different materials. Also, orientated directional deposition (on-side deposition, asymmetric deposition) is possible.
  • a grating profile may be binary, slanted, quadrate, etc. with different slanted surfaces, etc.
  • a number of features of the invention may be utilized in connection with light incoupling and related solutions.
  • LED light incoupling and collimation for a typically planar element is a critical issue.
  • a flat ball lens bar optionally in a row form is a unique solution. It could contain 2D or 3D surface depending on the collimation axis. Principally, one axis collimation may be enough.
  • Such an optical solution may be produced separately or together with the planar element.
  • Possible manufacturing methods include injection molding, casting, laser cutting, etc. It is possible to use mirror surface on the top and bottom for the light direction control. Also special grating orientating patterns on the edge and/or e.g. top may provide desired solutions.
  • a wedge type of collimation with air medium is a further feasible option.
  • FIG. 9 a illustrates one embodiment for incoupling purposes.
  • the incoupling element 902 includes a number of potentially embedded (e.g. a laminated film) reflector forms 908 and a potentially embedded (e.g. laminated film) light directing structure 906 that may be provided as a laminated layer/element on a predetermined surface of the carrier material 904 such as plastic or glass.
  • a plurality of LEDs 910 is applied as light sources.
  • FIG. 9 b illustrates further embodiments relating to the incoupling structures.
  • top/bottom view of one embodiment is shown with a plurality of light sources such as LEDs 910 , incoupling forms such as lens forms 924 a and a target element 922 .
  • the shown lens forms are basically circular or ellipsoidal.
  • other embodiment with different incoupling forms such as lens forms 924 b is presented.
  • lens shapes 924 a , 924 b are apparent in the figure.
  • a laminated lens element such as lens film may be utilized to form nano-/microcavity coupling structures.
  • Embossed/imprinted films can be laminated on a carrier material/film. This makes possible to produce new lens structures with multi layer patterns. Another benefit is that optical patterns are completely integrated/embedded and those can't be defected or destroyed easily. There are several feasible applications, such as street lamps, halogen replacements, etc.
  • Another potential illumination lens is a non-direct transmission element, which couples light e.g. from the air medium and directs it to preferred angles.
  • One surface may have a reflector (2D or 3D) and the other a surface coupling pattern (2D or 3D).
  • a light source, such as LED, bar may be collimated at least in 2D horizontal direction. This may make coupling pattern more simple and efficient.
  • the solution may have applications in e.g. street lights, public illumination, etc.
  • Another application is a light bar, rod or tube, in which the coupling structure or film forms or is in the outer or inner surface thereof for coupling and directing the light.
  • a reflector rod may be utilized in the center (inner part).
  • a coupling film may also be laminated in the glass to direct the light to preferred angles (inside or outside).
  • FIG. 10 illustrates a laminate structure 1002 including a plurality of elements 1004 , 1006 in accordance with an embodiment of the invention.
  • a number of embedded, integrated functionalities may be provided to the laminate 1002 by adding new elements such as functional carrier films 1004 with surface relief patterns and/or particular material (e.g. in terms of refractive index) thereto.
  • Surface relief patterns may be established directly on the target surfaces.
  • Curable materials such as lacquer may be utilized.
  • the necessary coupling and/or other optics may be laminated as a film or a thicker element to the carrier entity thereof. Roll-to-roll processing techniques are possible and often preferred naturally still depending on the embodiment and the nature, such as flexibility and thickness of the applied elements.
  • FIG. 11 discloses, by way of example only, a flow diagram of a method of manufacture in accordance with the invention.
  • the necessary equipment such as embossing/imprinting gear, molding gear, casting gear, lamination gear, curing gear and/or roll-to-roll gear is obtained and configured. Yet, source materials for laminate layers and the lamination itself, such as necessary adhesives, if any, are obtained.
  • a first carrier element defining at least one layer of the integrated laminate structure is obtained.
  • the first element may be provided with desired surface relief patterns and coatings. Curable material, such as lacquer, may be provided, embossed or otherwise processed to contain a surface relief pattern and cured, for example.
  • the element may be molded or cut to desired dimensions from a larger piece of source material, such as plastic or glass. It may be subjected to a number of treatments and/or provided with adhesive for lamination purposes.
  • the first element may be a multilayer element such as a laminate element itself. It may be contain e.g. a plurality of solar cell-constituting layers and/or elements.
  • a second carrier element to be utilized in the integrated laminate structure contains a number of surface relief patterns that may be fabricated, as the ones of the first element, with different methods, such as roll-to-roll embossing/imprinting, lithography, micro-molding, casting etc. on the surface thereof. It may contain plastic, glass or ceramic material, for example. Suitable curing may be applied. Further, desired additional elements and/or coatings may be provided to the second element.
  • the second element may be a multilayer element, such as a laminate element.
  • a surface relief pattern may be produced by a pre-master pattern, master pattern and related elements.
  • a pre-master element with a pre-mastering pattern may be first created by micro machining, lithography, imprinting, embossing and/or by some other method. This pre-mastering pattern may be then replicated by electroforming, casting or molding. Then formed nickel shim, a plastic master plate, a cast material plate, a molded plate may contain plurality of micro relief pattern on the surface, preferably small grooves, recesses, dots, pixels, etc.
  • the typically negative relief patterns of the pre-master are advantageously suitable for the inkjet and/or printing modulation process.
  • This modulation process may be based on a profile filling method, in which the existing groove, recess, dot, pixel, etc. is potentially completely filled with inkjet/printed material. This material is dispensed by forming small pico-drops in order to fill and “hide” the existing patterns.
  • Method is suitable to complete a filling factor modulation on the surface of the target element, i.e. the master.
  • the method is suitable for many other applications as well, and not only to filling factors. It is suitable also to design different discrete figures, icons, forms and shapes, for example. This can make it possible to create low cost optical designing process, which is fast, flexible and first of all, easy to utilize.
  • the profile filling method suggested herein is generally feasible also in other contexts than merely the laminate context of the present application.
  • the fill material such as ink, for example, could be transparent and optically clear, which has preferable the same refractive index than the plate material. This way it may be possible to make real functional tests and trials. But e.g. colored ink is also possible, but then replication process may be needed in order to obtain a functional, optical test part.
  • the drop size and material viscosity may be important in terms of controlled and high quality filling. If the viscosity is too low, the drop will flow for large area and it goes along the groove bottom. Thus, completely filled structure is getting more difficult to achieve. If the viscosity is high, the drop size is getting bigger, but the form is more compact and does not flow on the groove too much.
  • a typical solution may therefore include low viscous material, which guarantees small drop size.
  • the drop may advantageously fill only preferred patterns in the desired location.
  • the pre-master may be typically patterned with small pixels or discrete profiles.
  • the first and second elements, and optionally further elements are laminated together utilizing suitable pressure, heat and optionally adhesive(s) between the elements to be laminated together.
  • Feasible curing may be applied.
  • the embedded surface relief profiles basically establish associated micro- and/or nanocavity patterns. Potentially very complicated volumes (e.g. cavities) may be created, which is difficult if not impossible by other methods.
  • Multilevel/multilayer patterns are possible by laminating several patterned medium carriers (elements) together.
  • An element to be included in the laminate may include a surface relief pattern on multiple sides thereof. Different patterns can provide different functionalities in the laminate.
  • One realization implies laminating e.g. UV embossed/imprinted thin films (patterned films) on a thicker carrier such as plastic or glass plate and then executing the final curing in order to obtain good adhesion between laminated film and plate.
  • Roll-to-roll lamination is possible provided that the laminated elements are suitable, i.e. thin/flexible enough, for the purpose.
  • Post-processing actions such as cutting, excess material removal, (re-)reeling, testing etc. may be performed.
  • the method execution is ended at 1112 .
  • FIG. 12 illustrates various aspects of possible roll-to-roll manufacturing scenarios applicable in connection with the invention.
  • two elements basically films, sheets or foils, 1204 , 1206
  • a surface relief pattern 1206 b is replicated by the cylinder/roll 1208 to the element 1206 during the process prior to the lamination.
  • the laminate structure 1216 is formed and the pattern 1206 b is laminated within the structure 1216 by the lamination cylinder/roll 1210 .
  • Pre-curing 1212 such as UV light curing may take place as well as post-curing 1214 , optionally again UV curing.
  • a number of further process actions such as cutting, reeling and testing actions may be implemented (not shown in the figure).
  • a target element such as element 1204 could also be provided with multiple additional layers, such as films optionally on both sides thereof. This might be implemented in one go, if the amount and nature of necessary hardware, such as cylinders/rolls etc., is sufficient. Alternatively, the same result could be obtained via multiple runs during which e.g. a single layer is added to the laminate per round.
  • FIG. 13 illustrates different potential items of a further embodiment of a typically roll-to-roll based manufacturing method in accordance with embodiments of the invention.
  • the particular example is about foil lamination, but a skilled person will realize the principles apply to various other carrier elements to be laminated as well.
  • a functional such as an optically functional element may be provided to a carrier material, such as a film.
  • a foil, film or other type of element may be first provided 1312 with material, such as lacquer, that enables forming surface relief forms therein and is curable.
  • the material hosting the surface relief pattern may indeed be thermally curable, UV curable, moisture curable, or e-beam curable, for instance, among other options.
  • combined curing techniques utilizing at least two curing methods such as UV curing+thermal curing, UV curing+moisture curing, thermal curing+e-beam curing, etc. may be applicable depending on the used materials.
  • the pattern may be, when needed, pre-cured 1318 by a suitable method such as UV curing potentially followed by lamination 1320 relative to a carrier element such as another film.
  • the established laminate “A” including the pattern A, typically as embedded may be cured at 1322 , after which it a further functional element, such as foil, may be coupled, typically by lamination 1324 , thereto, which is generally shown, by way of example only, at 1304 with substantially similar process items indicated by identical reference numerals supplemented by ‘b’, however. Nevertheless, these process items do not have to be similar and e.g. different pattern formation technique and/or curing technology could be applied.
  • the further functional element may include a pattern “B” as indicated in the figure.
  • the final laminate including both patterns A and B may be subjected to a number of applicable curing 1326 procedures and/or other treatments.
  • one or more elements of the integrated laminate structure may contain the explained cavity optics for predetermined purpose, such as uniform illumination or discrete illumination.
  • the optically functional elements may be integrated by lamination with other elements such as covers of various electronic or other devices.
  • the invention enables providing localized optical functions within integrated structures, such as laminates. Local effects and visual indications, such as informative indications, may be created in certain embodiments thereof.
  • the relief forms may be positive or negative relative to the associated surface level of the carrier substrate.
  • the elements of the integrated structure may be attached using some other methods such as mechanical fastening structures, mere adhesives, etc.
  • a laminate structure according to the invention may be further integrated with or configured to contain other elements, such as chips, chip packages, solar cell structures, light sources, lighting elements, electronics, cover and/or body structures, etc.
  • Each of the afore-explained various functions/functionalities may be implemented in the laminate structure by a dedicated element, a shared element or by a plurality of cooperating elements.
  • the laminate solution presented herein could be utilized in other contexts such as microfluidics.
  • cooling structures and cooling channels could be manufactured therewith.
  • lubricant channels could be formed.

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