Thin optical security element and method of designing it

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 patter...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: PAULY, Mark, DEGOTT, Pierre, DINOEV, Todor, SCHWARTZBURG, Yuliy, CALLEGARI, Andrea, MAYER, Alain, GARNIER, Christophe, TESTUZ, Romain
Format: Patent
Sprache:eng
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Beschreibung
Zusammenfassung: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.