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, Malmberg, Sean Magnus, Herman, Peter, Macpherson, Charles Douglas, Omrane, Badr
Format Patent
LanguageEnglish
Published 30.01.2024
Subjects
BOOK COVERS
BOOKBINDING
CLADDING OR PLATING BY SOLDERING OR WELDING
COLOUR PRINTING
CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING
DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDEDFOR
FILES
LINING MACHINES
LOOSE LEAVES
MACHINE TOOLS
METAL-WORKING NOT OTHERWISE PROVIDED FOR
MOVABLE-STRIP WRITING OR READING APPARATUS
PERFORMING OPERATIONS
PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITYFEATURES
PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOTOTHERWISE PROVIDED FOR
PRINTING
PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES
SOLDERING OR UNSOLDERING
SPECIAL PRINTED MATTER
STAMPS
TRANSPORTING
TYPEWRITERS
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: US202017619296