Общ преглед
Първото поколение лазерна технология против фалшифициране се използва основно за изработване на лазерно формовани холографски етикети против фалшифициране.
Becauseofthepoormonochromaticityandpoorcoherenceofordinarylightsources,thedevelopmentofholographictechnologyisslow,anditisdifficulttotakesatisfactoryholograms.Untiltheemergenceoflaserintheearly1960s,withitshighbrightness,highmonochromaticityandhighcoherencecharacteristics,itquicklypromotedthedevelopmentofholographictechnology.Manykindsofhologramswereproduced,andtheholographictheorywaswellverified..
Inthelate1970s,itwasdiscoveredthatholographicpictureshadasurfacestructurecontainingthree-dimensionalinformation(thatis,crisscrossinterferencefringes,whichcanbetransferredtohigh-densityphotosensitivefilmandothermaterials).In1980,Americanscientistsusedembossingholographictechnologytotransfertheholographicsurfacestructuretoapolyesterfilm,thussuccessfullyprintingtheworld'sfirstembossedholographicpicture.Thiskindoflaserholographicpicture,alsoknownasrainbowholographicpicture,istoproduceimagesonplasticfilmthroughlaserplatemakingtoproducecolorfuldiffractioneffects,givingthepictureasenseoftwo-dimensionalandthree-dimensionalspace.Underordinarylight,thehiddenimagesandinformationinthepicturewillreappear,andwhenthelightshinesfromacertainangle,anewimagewillappearonthepicture.Thiskindofmouldedholographicpicturescanbecopiedquicklyinlargequantitieslikeprinting,withlowcost,andcanalsobeusedincombinationwithallkindsofprintedmatter.Sofar,holographicphotographyhastakenadecisivesteptowardssocialapplications.
Принцип
По това време производствената технология на този вид формована холографска картина е била много напреднала и само няколко души са я познавали, така че е била използвана за създаване на знаци против фалшифициране. Принципът на анти-фалшифицирането е:
1.Inthewholeprocessoflaserholographicpictureshooting,ifthereisadifferentcondition(suchastheconditionofshootingrainbowhologram),theeffectoftheholographicmarkwillbedifferent;/p>
2.Theholographicinformationofthiskindofholographicimagecannotbephotographedbyordinaryphotography,soitisdifficulttocopytheholographicpattern.
Thefirstproducttouseholographicimagesasananti-counterfeitingmarkwasJohnnyWalkeWhishy(akindofwhiskey),andthesalesofthewineincreasedbyabout45%comparedtothepreviousone.
Lasermoldedholographicanti-counterfeitingtechnologywasintroducedtomycountryinthelate1980sandearly1990s.From1990to1994,hundredsofproductionlineswereintroducedacrossthecountry,accountingformorethanhalfoftheworld'smanufacturersatthattime..Intheearlystageofintroduction,thiskindofanti-counterfeitingtechnologydidplayacertainroleinanti-counterfeiting,butwiththerapidproliferationoflaserholographicimageproductiontechnology,itwassoonbreachedbycounterfeitersfromallaspects,andthelaserholographicanti-counterfeitinglabelalmostcompletelylostitsanti-counterfeitingability.,Thelasermoldingequipmenthasdroppedfromtheinitialtensofmillionsofdollarsperpiecetotensofthousandsofyuanperpiece.
Technology
Theproliferationofthefirstgenerationoflaserholographicanti-counterfeitingtechnologyhaspromptedpeopletostartseekingtoimprovetheexistingtechnology.Therearemainlythreeimprovedtechnologies:oneistheapplicationofcomputerimageprocessingtechnologytoimproveholographicimages;theotheristransparentlaserholographicimageanti-counterfeitingtechnology;thethirdisreflectivelaserholographicimageanti-counterfeitingtechnology.