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1. WO2008046537 - SECURITY FEATURE COMPRISING LIQUID CRYSTAL LAYERS

Considered void:  05.12.2007
Publication Number WO/2008/046537
Publication Date 24.04.2008
International Application No. PCT/EP2007/008700
International Filing Date 08.10.2007
CPC
B42D 2033/26
BPERFORMING OPERATIONS; TRANSPORTING
42BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
DBOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
2033Structure or construction of identity, credit, cheque or like information-bearing cards
26Liquid-crystal material
B42D 25/00
BPERFORMING OPERATIONS; TRANSPORTING
42BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
DBOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
25Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
B42D 25/23
BPERFORMING OPERATIONS; TRANSPORTING
42BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
DBOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
25Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
20characterised by a particular use or purpose
23Identity cards
B42D 25/29
BPERFORMING OPERATIONS; TRANSPORTING
42BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
DBOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
25Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
20characterised by a particular use or purpose
29Securities; Bank notes
B42D 25/364
BPERFORMING OPERATIONS; TRANSPORTING
42BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
DBOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
25Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
30Identification or security features, e.g. for preventing forgery
36comprising special materials
364Liquid crystals
B42D 25/45
BPERFORMING OPERATIONS; TRANSPORTING
42BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
DBOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
25Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
40Manufacture
45Associating two or more layers
Applicants
  • GIESECKE & DEVRIENT GMBH [DE]/[DE] (AllExceptUS)
  • HOFFMÜLLER, Winfried [DE]/[DE] (UsOnly)
  • BURCHARD, Theodor [DE]/[DE] (UsOnly)
Inventors
  • HOFFMÜLLER, Winfried
  • BURCHARD, Theodor
Agents
  • ZEUNER, Stefan
Priority Data
10 2006 049 951.419.10.2006DE
Publication Language German (DE)
Filing Language German (DE)
Designated States
Title
(DE) SICHERHEITSELEMENT MIT FLÜSSIGKRISTALLSCHICHTEN
(EN) SECURITY FEATURE COMPRISING LIQUID CRYSTAL LAYERS
(FR) ÉLÉMENT DE SÉCURITÉ COMPORTANT DES COUCHES DE CRISTAUX LIQUIDES
Abstract
(DE)
Die Erfindung betrifft ein Sicherheitselement (12) für Sicherheitspapiere, Wertdokumente und dergleichen mit zwei übereinander angeordneten Schichten (22, 24) aus cholesterischem flüssigkristallinen Material, die jeweils in eine erste Betrachtungsrichtung senkrecht zu ihrer Oberfläche selektiv Licht (30, 34) aus einem ersten, längerwelligen Spektralbereich und in eine zweite Betrachtungsrichtung unter einem Winkel zur Senkrechten zu ihrer Oberfläche selektiv Licht (32, 36) aus einem zweiten, kürzerwelligen Spektralbereich reflektieren. Erfindungsgemäß liegt eine erste der beiden Schichten (22) in Form eines darzustellenden Motivs vor und reflektiert in die erste Betrachtungsrichtung Licht (34) aus dem grünen Spektralbereich, während die zweite der beiden Schichten (24) Licht (32) aus dem grünen Spektralbereich in die zweite Betrachtungsrichtung reflektiert.
(EN)
The invention relates to a security feature (12) for security papers, valuable documents or similar, comprising two layers (22, 24) of cholesteric liquid crystal material located one above the other, the respective layers selectively reflecting light (30, 34) in a first, longer-wavelength spectrum when viewed from a first direction perpendicular to the surface of the layer and selectively reflecting light (32, 36) in a second, shorter-wavelength spectrum when viewed from a second direction running at an angle to the perpendicular of said surface. According to the invention, a first of the two layers (22) is in the form of a motif to be represented and reflects light (34) in the green spectrum when viewed from the first direction, whereas the second of the two layers (24) reflects light (32) in the green spectrum when viewed from the second direction.
(FR)
L'invention concerne un élément de sécurité (12) pour des papiers de sûreté, des documents de valeur et analogue, comprenant deux couches superposées (22, 24) d'un matériau de type cristaux liquides cholestériques. Ces couches réfléchissent respectivement, de manière sélective, la lumière (30, 34) dans un premier domaine spectral de plus grande longueur d'onde lorsqu'elles sont observées dans une première direction perpendiculaire à la surface des couches, et réfléchissent en outre sélectivement la lumière (32, 36) dans un deuxième domaine spectral de plus petite longueur d'onde lorsqu'elles sont observées dans une deuxième direction s'étendant selon un angle par rapport à la normale à la surface des couches. Selon l'invention, une première (22) de ces deux couches se présente sous la forme d'un motif à représenter et réfléchit la lumière (34) dans le domaine spectral vert lorsqu'elle est observée dans la première direction, tandis que la deuxième (24) de ces deux couches réfléchit la lumière (32) dans le domaine spectral vert lorsqu'elle est observée dans la deuxième direction.
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