CA2032587A1 - Data carrier having a liquid crystal security element - Google Patents

Data carrier having a liquid crystal security element

Info

Publication number
CA2032587A1
CA2032587A1 CA2032587A CA2032587A CA2032587A1 CA 2032587 A1 CA2032587 A1 CA 2032587A1 CA 2032587 A CA2032587 A CA 2032587A CA 2032587 A CA2032587 A CA 2032587A CA 2032587 A1 CA2032587 A1 CA 2032587A1
Authority
CA
Canada
Prior art keywords
liquid crystal
security element
data carrier
plastics
crystal 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
Application number
CA2032587A
Other languages
French (fr)
Other versions
CA2032587C (en
Inventor
Christoph Heckenkamp
Gerhard Schwenk
Jurgen Moll
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GAO Gesellschaft fuer Automation und Organisation mbH
Original Assignee
Christoph Heckenkamp
Gerhard Schwenk
Jurgen Moll
Gao Gesellschaft Fur Automation Und Organisation Mbh
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6396250&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=CA2032587(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Christoph Heckenkamp, Gerhard Schwenk, Jurgen Moll, Gao Gesellschaft Fur Automation Und Organisation Mbh filed Critical Christoph Heckenkamp
Publication of CA2032587A1 publication Critical patent/CA2032587A1/en
Application granted granted Critical
Publication of CA2032587C publication Critical patent/CA2032587C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; 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
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/364—Liquid crystals
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07F—COIN-FREED OR LIKE APPARATUS
    • G07F7/00—Mechanisms actuated by objects other than coins to free or to actuate vending, hiring, coin or paper currency dispensing or refunding apparatus
    • G07F7/08—Mechanisms actuated by objects other than coins to free or to actuate vending, hiring, coin or paper currency dispensing or refunding apparatus by coded identity card or credit card or other personal identification means
    • G07F7/086—Mechanisms actuated by objects other than coins to free or to actuate vending, hiring, coin or paper currency dispensing or refunding apparatus by coded identity card or credit card or other personal identification means by passive credit-cards adapted therefor, e.g. constructive particularities to avoid counterfeiting, e.g. by inclusion of a physical or chemical security-layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; 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
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; 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
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/355—Security threads
    • B42D2033/26—

Abstract

A data carrier such as an identity card or a paper of value protected against attempted forgery using color copiers and containing an optically variable security element made of a liquid crystal material. The security element. e.g. a safeguarding thread, has a plastics-like layer made of a liquid crystal polymer which shows a pronounced play of colors at room temperature. The plastics-like properties of liquid crystal polymers permit easy processing into a semifinished product or into the finished product, so that completely different types of security elements can be produced.
CA002032587A 1989-12-22 1990-12-18 Data carrier having a liquid crystal security element Expired - Fee Related CA2032587C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3942663A DE3942663A1 (en) 1989-12-22 1989-12-22 DATA CARRIER WITH A LIQUID CRYSTAL SECURITY ELEMENT
DEP3942663.7 1989-12-22

Publications (2)

Publication Number Publication Date
CA2032587A1 true CA2032587A1 (en) 1991-06-23
CA2032587C CA2032587C (en) 1996-07-09

Family

ID=6396250

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002032587A Expired - Fee Related CA2032587C (en) 1989-12-22 1990-12-18 Data carrier having a liquid crystal security element

Country Status (6)

Country Link
EP (1) EP0435029B2 (en)
JP (1) JP3244278B2 (en)
AT (1) ATE126135T1 (en)
CA (1) CA2032587C (en)
DE (2) DE3942663A1 (en)
ES (1) ES2075871T5 (en)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2276883A (en) * 1993-04-05 1994-10-12 Central Research Lab Ltd Optical material containing a liquid crystal
US5629055A (en) * 1994-02-14 1997-05-13 Pulp And Paper Research Institute Of Canada Solidified liquid crystals of cellulose with optically variable properties
US5678863A (en) * 1992-07-24 1997-10-21 Portals Limited High value documents
US5851604A (en) * 1994-05-06 1998-12-22 Consortium Fur Elektrochemische Industrie Gmbh Interference pigments comprising molecules fixed in a cholesteric configuration, and use thereof
US6273473B1 (en) 1996-10-10 2001-08-14 Securency Pty Ltd Self-verifying security documents
US7040663B1 (en) 1999-02-23 2006-05-09 Giesecke & Devrient, Gmbh Value document
US7386125B2 (en) 2002-10-28 2008-06-10 Qdesign Usa, Inc. Techniques of imperceptibly altering the spectrum of a displayed image in a manner that discourages copying
US7728931B2 (en) 2004-04-30 2010-06-01 Giesecke & Devrient Gmbh Security element and method for producing same
CN102759441A (en) * 2012-07-20 2012-10-31 西北工业大学 Multiband polarization imaging anti-counterfeiting element identification system
EP1226308B2 (en) † 1999-08-31 2012-11-14 Giesecke & Devrient GmbH Safety element and a valuable object
US8322753B2 (en) 2006-11-22 2012-12-04 Nhk Spring Co., Ltd. Identification medium, identification method, and identification apparatus
US8350259B2 (en) 2008-05-30 2013-01-08 Polyic Gmbh & Co. Kg Electronic circuit
US8432589B2 (en) 2007-05-21 2013-04-30 Ovd Kinegram Ag Multi-layer body having optical-action elements for producing an optical effect
US8883273B2 (en) 2006-08-10 2014-11-11 De La Rue International Limited Photonic crystal security device
US8927072B2 (en) 2006-08-10 2015-01-06 De La Rue International Limited Photonic crystal security device
US8968856B2 (en) 2006-03-31 2015-03-03 Giesecke & Devrient Gmbh Security element and method for its production

Families Citing this family (90)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5766738A (en) * 1979-12-28 1998-06-16 Flex Products, Inc. Paired optically variable article with paired optically variable structures and ink, paint and foil incorporating the same and method
GB9025390D0 (en) * 1990-11-22 1991-01-09 De La Rue Thomas & Co Ltd Security device
GB9106128D0 (en) * 1991-03-22 1991-05-08 Amblehurst Ltd Article
FR2698390B1 (en) * 1992-11-20 1994-12-23 Arjo Wiggins Sa Security document authenticated by piezooptic effect.
GB2283455B (en) * 1993-11-03 1997-01-15 Willett Int Ltd Method for authenticating or confirming the integrity of a document or other ing and articles for use in the method
EP0689065B1 (en) * 1994-06-24 2001-06-27 Rolic AG Optical component
US5903330A (en) * 1995-10-31 1999-05-11 Rolic Ag Optical component with plural orientation layers on the same substrate wherein the surfaces of the orientation layers have different patterns and direction
DE69737554D1 (en) 1996-08-05 2007-05-16 Matsushita Electric Ind Co Ltd DATA TRANSMITTER, RECEIVER, PROCESSOR, DEVICE AND SYSTEM FOR MANAGING EQUIPMENT, DATA ENTRY AND RECEIVING SYSTEM AND TRANSMISSION MEDIUM
DE19639229A1 (en) * 1996-09-24 1997-06-05 Wacker Chemie Gmbh Composition with matrix containing pigment with angle-dependent colour in different matrix
DE19645084A1 (en) * 1996-11-01 1998-05-07 Austria Card Gmbh Identification card with additional security features and processes for their production
FR2764314A1 (en) * 1997-06-09 1998-12-11 Arjo Wiggins Sa Security document with integrated authentication system
DE69832574T2 (en) * 1997-07-29 2006-06-14 Nhk Spring Co Ltd Optical identification system with cholesteric liquid crystals
DE19735628C2 (en) * 1997-08-18 1999-10-14 Johannes Puff Procedure to prevent counterfeiting of a non-personal means of access authorization
DE19737612A1 (en) * 1997-08-28 1999-03-04 Consortium Elektrochem Ind Machine-detectable security marking, production of the security marking and security system that cannot be recognized by the eye and encompass this security marking
DE19737618A1 (en) * 1997-08-28 1999-03-04 Consortium Elektrochem Ind Machine-detectable security marking with increased protection against forgery, production of the security marking and security system comprising this security marking
DE19743722A1 (en) * 1997-10-02 1999-04-08 Wacker Chemie Gmbh Polysiloxanes with heterocyclic functions, their production and use
US20020117845A1 (en) 2000-01-03 2002-08-29 Bundesdruckerei Gmbh Security and/or valve document
DE19833746A1 (en) * 1998-07-27 2000-02-03 Joergen Brosow Security paper and method for checking authenticity of documents recorded on it protects securities like bank notes against forgery by using embedded electronic switching circuit
JP4336008B2 (en) * 1998-11-17 2009-09-30 日本発條株式会社 Object identification structure and identification method
DE19904282C2 (en) * 1999-02-03 2002-05-29 Xetos Ag information carrier
DE19909471A1 (en) * 1999-03-04 2000-09-07 Bayerische Motoren Werke Ag Decorative element
EP1169179B2 (en) † 1999-04-07 2012-11-14 Trüb AG Data carrier and method for producing same
EP1203968B1 (en) * 1999-04-21 2012-06-27 Nippon Mitsubishi Oil Corporation Production method for an optical laminate
WO2000072056A1 (en) * 1999-05-24 2000-11-30 Toppan Printing Co., Ltd. Laminated composite body, information recording medium, and member for imparting counterfeit preventive function
JP2001091719A (en) * 1999-09-27 2001-04-06 Nippon Mitsubishi Oil Corp Optical device and security device
DE10007916A1 (en) 2000-02-21 2001-08-23 Giesecke & Devrient Gmbh Multilayer laminated card with interposed security element having relief structures
DE10008851A1 (en) † 2000-02-25 2001-08-30 Giesecke & Devrient Gmbh Manufacturing laser-writeable data media involves applying transparent, optically variable layer then producing marking through optically variable layer by action of laser beam
JP2002040252A (en) * 2000-07-27 2002-02-06 Shiseido Co Ltd Optical sheet containing cholesteric liquid crystal layer, information recording body using the same, method for recording information and method for discriminating information
GB0025096D0 (en) * 2000-10-13 2000-11-29 Bank Of England Detection of printing and coating media
JP2002127647A (en) * 2000-10-19 2002-05-08 Nhk Spring Co Ltd Discriminating medium of object and manufacturing method thereof
JP4565591B2 (en) * 2000-11-29 2010-10-20 トッパン・フォームズ株式会社 Card holding cholesteric liquid crystalline compounds
EP1227347A1 (en) * 2001-01-29 2002-07-31 Rolic AG Optical device and method for manufacturing same
ATE337191T1 (en) * 2001-04-24 2006-09-15 Merck Patent Gmbh BIrefringent marking
US7081282B2 (en) 2001-07-02 2006-07-25 Merck Patent Gmbh Optically variable marking
EP1281538A3 (en) 2001-07-02 2004-01-28 MERCK PATENT GmbH Optically variable marking
GB0201767D0 (en) 2002-01-25 2002-03-13 Rue De Int Ltd Improvements in methods of manufacturing substrates
JP2003231380A (en) 2002-02-12 2003-08-19 Nhk Spring Co Ltd Discrimination medium for object and discrimination method
JP2003337218A (en) * 2002-05-21 2003-11-28 Nippon Oil Corp Laminated body for transfer
DE10222433A1 (en) * 2002-05-22 2003-12-11 Kurz Leonhard Fa Strip-shaped security element
CN100486805C (en) 2002-09-13 2009-05-13 日本发条株式会社 Object identifying medium using multi-layer thin-film
DE10243650A1 (en) * 2002-09-19 2004-04-01 Giesecke & Devrient Gmbh security element
JP2004133152A (en) * 2002-10-10 2004-04-30 Nippon Oil Corp Transferable liquid crystal laminate
DE10331798B4 (en) * 2003-07-14 2012-06-21 Giesecke & Devrient Gmbh Security element, valuable item, transfer material and manufacturing process
CN101164797B (en) 2003-07-14 2012-07-18 Jds尤尼费斯公司 Security thread
DE10342674B4 (en) * 2003-09-16 2007-07-19 Leonhard Kurz Gmbh & Co. Kg Method and film system for producing an individualized optically variable element
AT501320B1 (en) * 2003-09-17 2008-10-15 Hueck Folien Gmbh PASSIVE ACTIVE SAFETY FEATURE
DE10343547A1 (en) * 2003-09-19 2005-04-14 Giesecke & Devrient Gmbh Object of value comprises a security element with at least one liquid crystal material which produces a linear light polarization and/or a dichroic effect with an orientation dependent refraction index
JP4257903B2 (en) 2003-10-28 2009-04-30 日本発條株式会社 Identification medium, identification medium identification method, identification target article, and identification apparatus
BRPI0416823A (en) * 2003-11-21 2007-02-13 Merck Patent Gmbh process for the modification of chiral liquid crystal films with the aid of extracting agents
EP1748306B1 (en) * 2004-04-14 2015-03-25 Dai Nippon Printing Co., Ltd. Authentication medium, same as label or transfer sheet, on sheet or information recording medium
DE102004018702B4 (en) * 2004-04-17 2006-05-24 Leonhard Kurz Gmbh & Co. Kg Film with polymer layer
DE102004021248A1 (en) 2004-04-30 2005-11-24 Giesecke & Devrient Gmbh Security element and method for its production
RU2377133C2 (en) 2004-04-30 2009-12-27 Гизеке Унд Девриент Гмбх Material of foil and method of its production
EP2123471B1 (en) 2004-04-30 2015-07-08 Giesecke & Devrient GmbH Safety element and method for its production
DE102004021247A1 (en) 2004-04-30 2005-11-24 Giesecke & Devrient Gmbh Security element and method for its production
DE102004039355A1 (en) 2004-08-12 2006-02-23 Giesecke & Devrient Gmbh Security element and method for its production
GB0412979D0 (en) 2004-06-10 2004-07-14 Rue De Int Ltd Improvements in security devices
JP4549119B2 (en) 2004-07-15 2010-09-22 日本発條株式会社 Identification medium and article provided with identification medium
GB0419157D0 (en) 2004-08-27 2004-09-29 Rue De Int Ltd A method of manufacturing a fibrous substrate incorporating an elongate element
JP4539909B2 (en) 2004-10-01 2010-09-08 日本発條株式会社 Identification medium and identification method thereof
FR2877609B1 (en) 2004-11-08 2007-03-09 Arjowiggins Security Soc Par A SAFETY STRUCTURE AND ARTICLE INCORPORATING SUCH A STRUCTURE
CN100550085C (en) * 2004-12-24 2009-10-14 日本发条株式会社 Discern medium, possess article, recognition methods and the recognition device of discerning medium
DE102005017655B4 (en) 2005-04-15 2008-12-11 Polyic Gmbh & Co. Kg Multilayer composite body with electronic function
DE102005031448A1 (en) 2005-07-04 2007-01-11 Polyic Gmbh & Co. Kg Activatable optical layer
DE102005035589A1 (en) 2005-07-29 2007-02-01 Polyic Gmbh & Co. Kg Manufacturing electronic component on surface of substrate where component has two overlapping function layers
DE102005044306A1 (en) 2005-09-16 2007-03-22 Polyic Gmbh & Co. Kg Electronic circuit and method for producing such
DE102005052928A1 (en) 2005-11-03 2007-05-16 Giesecke & Devrient Gmbh See-through security element and method for its manufacture
US20080261130A1 (en) 2005-11-22 2008-10-23 Robert Hammond-Smith Process for a Thermal Transfer of a Liquid Crystal Film Using a Transfer Element
GB0525888D0 (en) 2005-12-20 2006-02-01 Rue De Int Ltd Improvements in methods of manufacturing security substrates
JP5158921B2 (en) 2005-12-28 2013-03-06 日本発條株式会社 Identification medium
GB2438383B (en) 2006-05-26 2008-10-08 Rue De Int Ltd Improvements in substrates
GB2438384B (en) * 2006-05-26 2008-10-29 Rue De Int Ltd Improvements in forming security devices
CA2598007A1 (en) 2006-08-29 2008-02-29 Jds Uniphase Corporation Printed article with special effect coating
JP4900790B2 (en) 2006-09-01 2012-03-21 日本発條株式会社 Identification medium, article, identification device, and identification medium identification method
GB2442711B (en) 2006-10-10 2011-04-13 Rue De Int Ltd Improvements in security devices
DE102007022437A1 (en) * 2007-05-10 2008-11-13 Leonhard Kurz Gmbh & Co. Kg Process for producing a crosslinked liquid-crystal layer and device for carrying out the process
DE102007034716A1 (en) 2007-07-23 2009-01-29 Giesecke & Devrient Gmbh security element
GB0720550D0 (en) 2007-10-19 2007-11-28 Rue De Int Ltd Photonic crystal security device multiple optical effects
GB2457911B (en) 2008-02-27 2010-05-12 Rue De Int Ltd Improved method for producing an optically varible security device
FR2933428B1 (en) * 2008-07-03 2010-08-27 Arjowiggins Licensing Sas SECURITY ELEMENT WITH VARIABLE OPTICAL EFFECT AND SHEET OR SECURITY DOCUMENT OR ARTICLE COMPRISING SAME
DE102008061608A1 (en) 2008-12-11 2010-06-17 Giesecke & Devrient Gmbh security element
DE102009016533A1 (en) * 2009-04-06 2010-10-07 Giesecke & Devrient Gmbh Piezochrome safety element based on liquid crystal
GB0906366D0 (en) 2009-04-14 2009-05-20 Rue De Int Ltd Security device
GB2474903B (en) 2009-10-30 2012-02-01 Rue De Int Ltd Improvements in security devices
GB2476228B (en) 2009-11-19 2012-02-01 Rue De Int Ltd Improvements in security devices
DE102012003601A1 (en) 2012-02-21 2013-08-22 Giesecke & Devrient Gmbh Printing process with Passer between print and watermark
IN2014MU03621A (en) 2013-11-18 2015-10-09 Jds Uniphase Corp
DE102015004072A1 (en) 2015-03-30 2016-10-06 Giesecke & Devrient Gmbh Multicolored security element with effect colors
GB2547236B (en) * 2016-02-11 2019-09-11 De La Rue Int Ltd Improvements in security devices
EP3959081A1 (en) * 2019-04-20 2022-03-02 Arrow Greentech Ltd Robust colour shift security film with wide spectrum complex spectral values and security thread made therefrom

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU488652B2 (en) * 1973-09-26 1976-04-01 Commonwealth Scientific And Industrial Research Organisation Improvements in or relating to security tokens
EP0079894A1 (en) * 1981-01-08 1983-06-01 Securicard Systems Limited Identification of articles
DE3110048A1 (en) * 1981-03-16 1982-09-30 Consortium für elektrochemische Industrie GmbH, 8000 München "COMPOSITIONS CONTAINING LIQUID CRYSTALLINE PHASES BASED ON CYCLIC ORGANOPOLYSILOXANS, THEIR PRODUCTION AND THEIR USE"
DE3119459A1 (en) * 1981-05-15 1982-12-09 Consortium für elektrochemische Industrie GmbH, 8000 München LIQUID-CRYSTALLINE PROPERTIES WITH CROSS-LINKED ORGANOPOLYSILOXANES
CH653161A5 (en) * 1981-10-27 1985-12-13 Landis & Gyr Ag DOCUMENT WITH A SECURITY CHARACTERISTIC AND METHOD FOR CHECKING THE DOCUMENT FOR AUTHENTICITY.
JPS5988780A (en) * 1982-11-08 1984-05-22 アメリカン・バンク・ノ−ト・カムパニ− Making of optical refraction recording body and optical refraction pattern
DE3331515A1 (en) * 1983-09-01 1985-03-21 Merck Patent Gmbh, 6100 Darmstadt TRIALKANOYLOXYSILANES

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5678863A (en) * 1992-07-24 1997-10-21 Portals Limited High value documents
GB2276883A (en) * 1993-04-05 1994-10-12 Central Research Lab Ltd Optical material containing a liquid crystal
US5629055A (en) * 1994-02-14 1997-05-13 Pulp And Paper Research Institute Of Canada Solidified liquid crystals of cellulose with optically variable properties
US5851604A (en) * 1994-05-06 1998-12-22 Consortium Fur Elektrochemische Industrie Gmbh Interference pigments comprising molecules fixed in a cholesteric configuration, and use thereof
US6273473B1 (en) 1996-10-10 2001-08-14 Securency Pty Ltd Self-verifying security documents
US6467810B2 (en) 1996-10-10 2002-10-22 Securency Pty Ltd Self-verifying security documents
US6761377B2 (en) 1996-10-10 2004-07-13 Securency Pty Ltd Self-verifying security documents
US7040664B2 (en) 1996-10-10 2006-05-09 Securency Pty Ltd Self-verifying security documents
US7040663B1 (en) 1999-02-23 2006-05-09 Giesecke & Devrient, Gmbh Value document
EP1226308B2 (en) † 1999-08-31 2012-11-14 Giesecke & Devrient GmbH Safety element and a valuable object
US7386125B2 (en) 2002-10-28 2008-06-10 Qdesign Usa, Inc. Techniques of imperceptibly altering the spectrum of a displayed image in a manner that discourages copying
US7747015B2 (en) 2002-10-28 2010-06-29 Qdesign Usa, Inc. Techniques of imperceptibly altering the spectrum of a displayed image in a manner that discourages copying
US7728931B2 (en) 2004-04-30 2010-06-01 Giesecke & Devrient Gmbh Security element and method for producing same
US8968856B2 (en) 2006-03-31 2015-03-03 Giesecke & Devrient Gmbh Security element and method for its production
US8883273B2 (en) 2006-08-10 2014-11-11 De La Rue International Limited Photonic crystal security device
US8927072B2 (en) 2006-08-10 2015-01-06 De La Rue International Limited Photonic crystal security device
US8322753B2 (en) 2006-11-22 2012-12-04 Nhk Spring Co., Ltd. Identification medium, identification method, and identification apparatus
US8432589B2 (en) 2007-05-21 2013-04-30 Ovd Kinegram Ag Multi-layer body having optical-action elements for producing an optical effect
US8350259B2 (en) 2008-05-30 2013-01-08 Polyic Gmbh & Co. Kg Electronic circuit
CN102759441A (en) * 2012-07-20 2012-10-31 西北工业大学 Multiband polarization imaging anti-counterfeiting element identification system

Also Published As

Publication number Publication date
DE59009504D1 (en) 1995-09-14
CA2032587C (en) 1996-07-09
EP0435029B2 (en) 2003-01-02
JP3244278B2 (en) 2002-01-07
EP0435029B1 (en) 1995-08-09
ES2075871T5 (en) 2003-07-16
ES2075871T3 (en) 1995-10-16
JPH04144796A (en) 1992-05-19
EP0435029A3 (en) 1991-09-18
DE3942663A1 (en) 1991-06-27
EP0435029A2 (en) 1991-07-03
ATE126135T1 (en) 1995-08-15

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