Domov Technika Holografický obraz

Holografický obraz



Přehled

První generace technologie flaseru proti padělání se používá hlavně při výrobě laserem lisovaného holografického obrazu proti padělání.

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.

Princip

V té době byla technologie výroby tohoto typu lisovaného holografického obrazu velmi pokročilá a jen málo lidí znalých, takže byla používána k výrobě značek proti padělání. Principem ochrany proti padělání je:

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.

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