OPTICAL VARIABLE ELEMENT HAVING A VARIABLE DISTANCE-LAYER THICKNESS

The security element (6) has a thin-film layer sequence (62,63,64,66,69) incorporating a diffractive structure (67) and at least one spacer layer (65) for providing a color shift via interference. The spacer layer is formed as 2 partial layers (65a,65b) and has a different layer thickness in a first...

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Bibliographic Details
Main Authors HEINRICH WILD, LUDWIG BREHM
Format Patent
LanguageEnglish
Published 03.03.2004
Edition7
Subjects
BOOK COVERS
BOOKBINDING
CINEMATOGRAPHY
DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDEDFOR
ELECTROGRAPHY
FILES
HOLOGRAPHIC PROCESSES OR APPARATUS
HOLOGRAPHY
LOOSE LEAVES
MOVABLE-STRIP WRITING OR READING APPARATUS
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
OPTICS
PERFORMING OPERATIONS
PHOTOGRAPHY
PHYSICS
PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITYFEATURES
PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOTOTHERWISE PROVIDED FOR
SPECIAL PRINTED MATTER
TRANSPORTING
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Summary:The security element (6) has a thin-film layer sequence (62,63,64,66,69) incorporating a diffractive structure (67) and at least one spacer layer (65) for providing a color shift via interference. The spacer layer is formed as 2 partial layers (65a,65b) and has a different layer thickness in a first region of the thin-film layer sequence to its thickness in a second region of the thin-film layer sequence, for providing 2 differing color shifts. Also included are Independent claims for the following: (a) a security product with an optically-variable element; (b) a foil with an optically-variable element; (c) a manufacturing method for an optically-variable element
Bibliography:Application Number: AU20030250772