DIFFRACTIVE STRUCTURES WITHIN POLYMER SUBSTRATES, THEIR MANUFACTURE AND USE

Disclosed are optical devices suitable as security devices for document authentication, which comprise at least one two-dimensional array of elongate laser-modified tracks extending within a document substrate that have a distinct optical refractive index compared to the unmodified substrate, which...

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Bibliographic Details
Main Authors HO, Stephen Paulchi, OMRANE, Badr, MACPHERSON, Charles Douglas, MALMBERG, Sean Magnus, HERMAN, Peter
Format Patent
LanguageEnglish
French
German
Published 26.07.2023
Subjects
BOOK COVERS
BOOKBINDING
CLADDING OR PLATING BY SOLDERING OR WELDING
CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING
DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDEDFOR
FILES
IMPREGNATING OR COATING OF PAPER
LOOSE LEAVES
MACHINE TOOLS
METAL-WORKING NOT OTHERWISE PROVIDED FOR
MOVABLE-STRIP WRITING OR READING APPARATUS
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
OPTICS
PAPER NOT OTHERWISE PROVIDED FOR
PAPER-MAKING
PERFORMING OPERATIONS
PHYSICS
PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D
PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITYFEATURES
PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOTOTHERWISE PROVIDED FOR
PRODUCTION OF CELLULOSE
PULP COMPOSITIONS
SOLDERING OR UNSOLDERING
SPECIAL PRINTED MATTER
TEXTILES
TRANSPORTING
TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G
WELDING
WORKING BY LASER BEAM
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Summary:Disclosed are optical devices suitable as security devices for document authentication, which comprise at least one two-dimensional array of elongate laser-modified tracks extending within a document substrate that have a distinct optical refractive index compared to the unmodified substrate, which can exhibit excellent diffractive effects. Also disclosed are the use of such devices for document authentication and methods for their production.
Bibliography:Application Number: EP20200831050