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THIN OPTICAL SECURITY ELEMENT AND METHOD OF DESIGNING IT
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Title:
THIN OPTICAL SECURITY ELEMENT AND METHOD OF DESIGNING IT
Subjects:
BOOK COVERS
;
BOOKBINDING
;
DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDEDFOR
;
FILES
;
LOOSE LEAVES
;
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
;
SPECIAL PRINTED MATTER
;
TRANSPORTING
Description:
The invention relates to a thin optical security element comprising a reflective or refractive light-redirecting surface having a relief pattern operable to redirect incident light from a light source and form a projected image on a projection surface, the projected image comprising a caustic pattern reproducing a reference pattern that is easily visually recognizable by a person. The invention also relates to a method for designing a relief pattern of a light-redirecting surface of a thin optical security element.
Creation Date:
2021
Language:
English;Portuguese
Source:
esp@cenet
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