# US 9,753,197 B2 · Identification film and pattern including photonic crystals and anticounterfeiting product including the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,753,197 B2 - Document ID: US9753197B2 - Status: Granted - Kind: B2 - Application number: 14/328,994 - Filed: 2014-07-11 - Published: 2015-03-19 - Granted: 2017-09-05 - Earliest claimed: 2013-09-17 - Assignees: Korea Advanced Institute of Science and Technology - Applicants: Korea Advanced Institute of Science and Technology; Eui Joung Hong - Inventors: Shin Hyun Kim; Seung Man Yang; Hye Soo Lee; Tae Soup Shim - Web page: https://patentgrep.com/patent/US9753197B2 ## CPC - G02B 5/26: Reflecting filters (G02B5/28 takes precedence) - B32B 27/08: of synthetic resin - B32B 27/20: using fillers, pigments, thixotroping agents - B42D 25/36: comprising special materials - B42D 25/41: using electromagnetic radiation (B42D25/435 takes precedence) - G02B 1/005: {made of photonic crystals or photonic band gap materials (photonic band-gap structures or photonic lattices in integrated optics G02B6/1225; photonic band-gap structures or photonic lattices in optical fibres G02B6/02295)} - G02B 5/206: {comprising particles embedded in a solid matrix} - G03F 7/0002: {Lithographic processes using patterning methods other than those involving the exposure to radiation, e.g. by stamping} - G03F 7/0012: {Processes making use of the tackiness of the photolithographic materials, e.g. for mounting; Packaging for photolithographic material; Packages obtained by processing photolithographic materials} - G03F 7/027: Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds (G03F7/075 takes precedence) - B32B 2264/0235: Aromatic vinyl resin, e.g. styrenic (co)polymers - B32B 2264/025: Acrylic resin particles, e.g. polymethyl methacrylate or ethylene-acrylate copolymers - B32B 2264/102: Oxide or hydroxide - B32B 2307/404: Multi-coloured - B32B 2307/416: Reflective - B32B 2425/00: Cards, e.g. identity cards, credit cards - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM - B42D: BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS - G03F: PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR; (phototypographic composing devices B41B; photosensitive materials or processes for photographic purposes G03C; electrophotography, sensitive layers or processes therefor G03G) ## Abstract An identification film and pattern having high transparency and a reflectance spectrum with respect to a particular wavelength and including photonic crystals patterned into a particular shape and an anticounterfeiting product including the same are disclosed. A highly transparent colloidal photonic crystal film is easily manufactured using photocurable colloidal suspensions. Even though a plurality of patterns (including sub-patterns) is formed in plural films, there is no reduction in optical characteristics such as transparency, reflectance spectra, and the like. Thus, a film patterned into a desired shape is manufactured and thus usability thereof is enhanced, and a plurality of reflectance spectra with various wavelength ranges is provided and thus identification capability or security is enhanced. ## Claims ### Claim 1 An identification film comprising: a pattern region formed by selective curing of monomer resin containing self-assembled colloidal crystals and comprising a pattern having a predetermined shape; and a binding region to surround and support the pattern region, wherein the pattern region has a reflectance spectrum with respect to a particular wavelength, wherein the identification film is formed such that a plurality of films stacked as multiple layers is patterned into a single shape, and wherein the multilayer identification films exhibit a synthesized structural color by color mixing of the respective layers and have a plurality of reflectance spectra with different wavelength ranges. ### Claim 2 (depends on 1) The identification film according to claim 1, wherein the pattern region and the binding region exhibit reflectance spectra with different wavelength ranges when the monomer resin in the binding region is cured or the monomer resin containing self-assembled colloidal crystals in the pattern region is cured by polymerization. ### Claim 3 (depends on 1) The identification film according to claim 1, wherein the monomer resin and the colloidal particles have the same index of refraction or a difference of 0.2 or less in index of refraction. ### Claim 4 (depends on 1) The identification film according to claim 1, wherein the pattern region comprises one or more sub-patterns having reflectance spectra with different reflective wavelength ranges. ### Claim 5 (depends on 4) The identification film according to claim 4, wherein the sub-patterns exhibit different structural colors than that of the pattern region. ### Claim 6 (depends on 1) The identification film according to claim 1, wherein the colloidal particles are selected from the group consisting of silica, titanium dioxide, polystyrene, and polymethylmethacrylate. ### Claim 7 (depends on 1) An anticounterfeiting product comprising: an object article needing to be identified; and the identification pattern or film according to claim 1 formed on the object article and exhibiting a reflectance spectrum with respect to a particular wavelength. ### Claim 8 (depends on 7) The anticounterfeiting product according to claim 7, wherein the object article is a bill, securities, an official document, a certificate, an identification card, or a financial card. ### Claim 9 An identification pattern comprising a photonic crystal pattern having a predetermined shape formed by curing monomer resin containing self-assembled colloidal crystals, wherein the photonic crystal pattern has a reflectance spectrum with respect to a particular wavelength, wherein the monomer resin and the colloidal particles have the same index of refraction or a difference of 0.2 or less in index of refraction, and wherein the identification pattern is formed by stacking of a plurality of photonic crystal patterns having the same shape as multiple layers to have a plurality of reflectance spectra with different reflective wavelength ranges and exhibits a synthesized structural color by color mixing of the respective layers. ### Claim 10 (depends on 9) The identification pattern according to claim 9, wherein the identification pattern comprises one or more sub-patterns having reflectance spectra with different wavelength ranges. ### Claim 11 A method of manufacturing an identification film, the method comprising: preparing a pattern region by injecting a colloidal dispersion in which colloidal particles are dispersed in a photocurable monomer between two parallel flat plates, positioning a mask pattern having a predetermined shape on the flat plates, photocuring the colloidal dispersion, and removing a portion of the colloidal dispersion having not been photocured; and preparing a binding region by injecting a photocurable monomer or a photocurable colloidal dispersion into a region from which the non-photocured portion has been removed, followed by photocuring, wherein colloidal particles injected in the preparing of the pattern region and colloidal particles injected in the preparing of the binding region have different sizes, and wherein the method is performed such that a plurality of identification films is manufactured and adhered to one another to form multiple layers. ### Claim 12 (depends on 11) The method according to claim 11, wherein the method is performed by forming a pattern region and forming a sub-pattern thereon or by forming a sub-pattern and forming a pattern region comprising the sub-pattern, wherein colloidal particles injected in the forming of the sub-pattern and colloidal particles injected in the forming of the pattern region have different sizes.