Angle coder of anti-counterfeiting color in optical micro-mirror arrays.pdf

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1、Optik124(2013)6146–6148ContentslistsavailableatScienceDirectOptikjournalhomepage:www.elsevier.de/ijleoAnglecoderofanti-counterfeitingcolorinopticalmicro-mirrorarraysMei∗Tang,QuanlongMiao,ZhicongWu,XiaosaiWang,HuQian,YixinZhangCollegeofScience,JiangnanUniversity,Wuxi214122,ChinaarticleinfoabstractA

2、rticlehistory:Basedontheopticalcharacteristicsofopticalmicro-mirrorandsubtractivecolortheory,anewanti-29November2012Receivedcounterfeitingmodelofmicro-mirrorpixelswasestablishedaccordingtotheanalysisoftheconnectionAccepted28April2013betweenthereflectivebrightnessandstructuralstability.Ourresultsdem

3、onstratethatthedigitalmicro-mirrorarraysbasedonthevalueofCMYKSsubtractivecolorhaveenoughreflectedbrightnessandstabilityKeywords:andcanbeusedforanti-counterfeitingopticalvariabledeviceswhendifferentprintingmicro-mirrorPrintingarraysarecoded.Thevarietyofopticaleffectsincludingasecuritycolorswitchonor

4、switchoffmicro-mirrorarrayhaveAnglebeendemonstratedbytheuseofdifferentblackcolorKorparticularcolorSvalue.ThedisplayanglecodercolororAnti-counterfeitingorientationofthesecuritycolorcanbesetorcodedwiththedifferentSorKvalue.©2013ElsevierGmbH.Allrightsreserved.variabledeviceOptical1.IntroductionThemic

5、ro-surfacestructurerepresentsamicro-reflectingmirrorstructureandY,MandCvaluesofeachopticallyinvariablepixelGreytonelithographyisawellknowntechniqueforproduc-determinethesurfaceslopedirectionsanddegreeofcurvatureofinghighresolutionmicrostructureswithquitecomplexsurfaceeachofthecorrespondingmicrorefle

6、ctingmirrorstructures,andKprofilesandsignificantdepthdimension[1–4].ThistechniqueandSvaluesofeachopticallyinvariablepixeldeterminethezenithisextendedtoincludetheconceptofpixilatedmicrostructureangleandazimuthalangleofsurfaceslopedirectionsofthecorre-arraysdefinedbyapaletteofafinitenumberof3Dgreytonepi

7、xelspondingmicroreflectingmirrorstructures.Bytheencodingoftheelements[4]andcanbeusedtofabricateamicro-mirrorarrayzenithangleandtheazimuthalangle(orthesurfaceslopedirec-featuringnovelconfigurationsofmicro-mirrorstop