EP2225417A2 - Structure de securite comportant des cristaux liquides nematiques - Google Patents
Structure de securite comportant des cristaux liquides nematiquesInfo
- Publication number
- EP2225417A2 EP2225417A2 EP08863469A EP08863469A EP2225417A2 EP 2225417 A2 EP2225417 A2 EP 2225417A2 EP 08863469 A EP08863469 A EP 08863469A EP 08863469 A EP08863469 A EP 08863469A EP 2225417 A2 EP2225417 A2 EP 2225417A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- region
- structure according
- opacity
- reflective
- security
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/40—Agents facilitating proof of genuineness or preventing fraudulent alteration, e.g. for security paper
Definitions
- the present invention relates to security structures intended to be incorporated in objects to be secured, for example valuable documents such as banknotes, coupons or coupons, packaging or documents of security. such as passports or identity cards.
- coatings having birefringence properties for example comprising so-called nematic liquid crystals.
- the application WO 02/085642 describes the use in security structures of a coating having birefringence properties and possibly comprising nematic liquid crystals.
- the invention thus has, according to one of its aspects, a security structure comprising: a first at least partially reflective region of reduced opacity, - a second at least partially reflective region of greater opacity than the first, a coating having birefringence properties, for example having nematic liquid crystals, at least partially covering the first and second regions.
- This coating may have been deposited by a printing technique.
- the invention offers new effects through the use of said coating, preferably nematic liquid crystals, superimposed on regions of varying opacity.
- This variation in opacity makes it possible to observe the coating differently, in particular the nematic liquid crystals, depending on whether the coating covers the first region of reduced opacity or the second region of greater opacity.
- at least partially reflective one must understand that one observes a reflection of specular type, as opposed to a diffuse reflection.
- Specular reflection may be more or less important depending on the viewing angle
- the reflective quality and the specular reflection limit may be chosen so as to obtain sufficient visibility of the liquid crystal through the polarizing filter.
- the first region of reduced opacity is semi-reflective, like a one-way mirror, while the second region of higher opacity is reflective.
- the first and second regions both appear reflective, which contributes to the visibility of the pattern (s) formed by the coating, in particular the layer of nematic liquid crystals; these patterns may not be precisely positioned relative to the first and second regions without having a significant impact on their visibility, unlike for example a nematic liquid crystal print on a structure having reflective zones metallized and demetallised transparent areas.
- the first and second regions can be obtained for example by a deposit of variable thickness of a metal, for example aluminum.
- the structure comprises a deposit of a first material defining the first region of reduced opacity, being covered with a deposit of a second material in the second region of greater opacity.
- the second region of higher opacity can completely surround the first region
- the first region can define patterns that repeat at regular intervals or not, these first patterns defining windows and / or text
- the opacity difference between the first and second regions, when the structure is observed in transvision (examination of the transmitted light), may depend on the manner in which the first and second regions are made, this opacity difference being adjusted to allow an easily visible contrast by daylight transvision
- the opacity gap between the opacity region low and that of opacity stronger, measured spectrophotometer (ISO 2471 background substrate) can be between 5 to 80 units, preferably 35-40
- the coating in particular the nematic liquid crystal layer, may form at least one pattern, for example a plurality of repeating patterns on the structure.
- the coating may for example comprise an impression of nematic liquid crystals in the form of at least one pattern.
- These patterns may for example define text or a logo or simple geometric shapes and may have a variable positioning vis-à-vis the area or areas of reduced opacity.
- Another object of the invention is, according to another of its aspects, an object, in particular a document, incorporating a security structure as defined above.
- the security structure may for example form a security thread extending from one edge to the other of the document.
- the document may comprise a fibrous substrate, for example a substrate comprising paper fibers.
- the invention also relates to a method for authenticating a security structure as defined above, comprising the following steps: to observe in reflection the structure, in particular in a non-polarized light, the observation taking place without polarizing filter, especially without linear and / or circular polarization filter, observe the structure in reflection through a polarizing filter. If necessary, the method may also include the step of observing the structure in transvision It can be concluded as to the authenticity of the structure by observing, through the polarizing filter, the coating having birefringence properties, in particular the liquid crystals, when the regions of the coating covering the areas of low opacity contrast with those covering the zones of high opacity. It can also be concluded as to the authenticity if the liquid crystals are not apparent in transvision and that only patterns formed by the regions of different opacities are observed.
- FIG. schematic, in front view, an example of a security structure according to the invention - Figure 2 is a cross section along II-II of Figure 1
- Figure 3 is a cross section along III-III of Figure 1
- FIG. 4 is a cross-section along IV-IV of FIG. 1
- FIG. 5 represents the structure of FIG. 1 under observation conditions making nematic liquid crystals observable
- FIG. 6 is a view similar to FIG.
- Figure 7 shows a document incorporating a security structure according to the invention
- Figure 8 schematically shows a top view of an alternative embodiment of the security structure.
- the actual proportions of the various elements represented have not always been respected, for the sake of clarity of the drawing.
- the structure 10 shown in FIGS. 1 to 5 comprises a transparent or translucent support 11, for example made of a thermoplastic film, for example polyester, PVC, PP, an aromatic polyamide or aramid, or others, and on this support a deposit 12 a metal, alloy or metal oxide, for example aluminum, copper, zinc, gold, platinum,. .
- the deposit 12 presents in the example considered a variable thickness, thus defining a first region 14 of smaller thickness and reduced opacity and a second region 15 of greater thickness and greater opacity.
- the thickness of the thinned layer 13 defining the first region 14 is chosen so as to give the structure, in this region 14, a semi-reflective or reflective character according to the angle of observation, that is to say whose reflectivity varies according to the angle of observation but the proportion of reflected light is less than 100%, while the thickness of the deposit 12 in the second region 15 gives the structure in this second region a character reflective opaque.
- the thickness of the thinned layer 13 is for example between 5 and 50 nm and the thickness of the deposit 12 in the second region 15 is for example between 100 and 300 nm.
- the first region 14 may be in various ways on the structure, for example in the form of "windows" 24 repeating at regular intervals along the structure 10, as illustrated.
- the first region 14 can still form at least one text or logo.
- the second region 15 completely surrounds the first region 14, but it could be different and the first region 14 could extend to at least one longitudinal edge of the structure 10.
- the structure 10 also comprises a coating of a birefringent material, in this case a layer of nematic liquid crystals, in the form of patterns 18 which are repeated at regular intervals along the structure and whose positioning relative to the first region 14 is predefined, so that the patterns 18 cover both the first region 14 and the second region 15.
- a birefringent material in this case a layer of nematic liquid crystals
- nematic liquid crystals used are for example those produced by the company Merck, adapted to conventional printing techniques, as disclosed in application WO 2004/025337.
- the nematic liquid crystals are not apparent, and only the patterns 24 which contrast with the second opaque region 15 are observed.
- the patterns 18 appear in front of a background that appears substantially plain, because the patterns 24 reflect the light and are not visible, or are only little, and are substantially confused with the second region 15 also reflective areas of low opacity may have a reflectivity different from high opacity areas, so nematic liquid crystals may have a contrast of observation significantly different depending on the areas, through polarizing filter.
- the invention is not limited to a particular way of obtaining the first and second regions, and it is possible for example, as illustrated in FIG. 6, to deposit on the support 11 a first reflecting material 20, the opacity is sufficiently weak to define the first region 14 and, at higher opacity locations, to deposit a second reflective material 21 on the first material 20.
- the first material is for example a metal such as aluminum and the second material is for example an oxide such as TiO x or ZnS, deposited under vacuum.
- the security structure 10 may be in the form of a security thread which for example is integrated in a document 30, which comprises for example a fibrous substrate, by a known technique of incorporation of a security thread.
- the security structure 10 may be disposed along its entire length on the surface of the document 30, or may be partially buried in the fibrous substrate.
- the document 30 may comprise other security elements, such as for example a watermark.
- the security structure 10 may also be in the form of a patch, as illustrated in FIG. 8, such a patch being for example intended to be glued on one face of the object to be secured, in a transparent or translucent region. of it.
- the invention is not limited to the illustrated examples.
- the reflective zones of low opacity can for example be made using an interference pigment, for example of titanium-based mica-coated plate or titanium oxide-coated glass plate, and the zones reflective with higher opacity can be achieved using an ink, for example based on aluminum powder, the two types of patterns being printed at the mark one of the other.
- the shape of the security structure can be modified and the first and second regions of different opacities can be made differently.
- the security structure can be applied to objects other than paper, for example a packaging, a packaging device, a drug blister, an optical disk, etc.
Landscapes
- Polarising Elements (AREA)
- Credit Cards Or The Like (AREA)
- Liquid Crystal (AREA)
- Laminated Bodies (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0760336A FR2925534B1 (fr) | 2007-12-24 | 2007-12-24 | Structure de securite comportant des cristaux liquides nematiques |
PCT/FR2008/052335 WO2009081035A2 (fr) | 2007-12-24 | 2008-12-17 | Structure de securite comportant des cristaux liquides nematiques |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2225417A2 true EP2225417A2 (fr) | 2010-09-08 |
EP2225417B1 EP2225417B1 (fr) | 2014-06-18 |
Family
ID=39673402
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08863469.6A Not-in-force EP2225417B1 (fr) | 2007-12-24 | 2008-12-17 | Structure de securite comportant des cristaux liquides nematiques |
Country Status (6)
Country | Link |
---|---|
US (1) | US8397995B2 (fr) |
EP (1) | EP2225417B1 (fr) |
BR (1) | BRPI0821705A2 (fr) |
CA (1) | CA2709826A1 (fr) |
FR (1) | FR2925534B1 (fr) |
WO (1) | WO2009081035A2 (fr) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2925924B1 (fr) * | 2007-12-28 | 2011-04-29 | Arjowiggins Licensing Sas | Papier de securite |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3601114A1 (de) * | 1986-01-16 | 1987-07-23 | Gao Ges Automation Org | Verfahren zur herstellung von sichrheitspapier mit eingelagertem sicherheitsfaden |
JP2831869B2 (ja) * | 1991-12-27 | 1998-12-02 | 日本ペイント株式会社 | ハロゲン化炭化水素の分解処理方法 |
WO1994020679A1 (fr) * | 1993-03-02 | 1994-09-15 | Arjo Wiggins S.A. | Papier de securite comportant des zones localisees d'epaisseur et d'opacite reduites et son procede de fabrication |
FR2723971B1 (fr) | 1994-08-24 | 1996-10-04 | Arjo Wiggins Sa | Procede de fabrication d'un papier de securite comportant des zones localisees de faible opacite et papier ainsi obtenu |
US6764014B2 (en) * | 1999-09-07 | 2004-07-20 | American Express Travel Related Services Company, Inc. | Transaction card |
EP1120737A1 (fr) * | 2000-01-27 | 2001-08-01 | Rolic AG | Dispositif optique de sécurité |
ATE337191T1 (de) * | 2001-04-24 | 2006-09-15 | Merck Patent Gmbh | Doppelbrechende markierung |
EP1335217B1 (fr) * | 2002-02-06 | 2011-03-02 | Merck Patent GmbH | Film birefringent et son utilisation |
WO2004025337A1 (fr) * | 2002-09-11 | 2004-03-25 | Merck Patent Gmbh | Marquage birefringent |
DE10331798B4 (de) * | 2003-07-14 | 2012-06-21 | Giesecke & Devrient Gmbh | Sicherheitselement, Wertgegenstand, Transfermaterial und Herstellungsverfahren |
-
2007
- 2007-12-24 FR FR0760336A patent/FR2925534B1/fr not_active Expired - Fee Related
-
2008
- 2008-12-17 BR BRPI0821705-0A patent/BRPI0821705A2/pt not_active IP Right Cessation
- 2008-12-17 WO PCT/FR2008/052335 patent/WO2009081035A2/fr active Application Filing
- 2008-12-17 CA CA2709826A patent/CA2709826A1/fr not_active Abandoned
- 2008-12-17 EP EP08863469.6A patent/EP2225417B1/fr not_active Not-in-force
- 2008-12-17 US US12/746,013 patent/US8397995B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO2009081035A2 * |
Also Published As
Publication number | Publication date |
---|---|
WO2009081035A2 (fr) | 2009-07-02 |
US8397995B2 (en) | 2013-03-19 |
CA2709826A1 (fr) | 2009-07-02 |
FR2925534A1 (fr) | 2009-06-26 |
FR2925534B1 (fr) | 2010-02-12 |
EP2225417B1 (fr) | 2014-06-18 |
WO2009081035A3 (fr) | 2009-10-08 |
US20100276488A1 (en) | 2010-11-04 |
BRPI0821705A2 (pt) | 2015-06-16 |
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