EP0640493A2 - Feuille anticopie - Google Patents

Feuille anticopie Download PDF

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Publication number
EP0640493A2
EP0640493A2 EP94112693A EP94112693A EP0640493A2 EP 0640493 A2 EP0640493 A2 EP 0640493A2 EP 94112693 A EP94112693 A EP 94112693A EP 94112693 A EP94112693 A EP 94112693A EP 0640493 A2 EP0640493 A2 EP 0640493A2
Authority
EP
European Patent Office
Prior art keywords
film
document
sawtooth
copying
film according
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
EP94112693A
Other languages
German (de)
English (en)
Other versions
EP0640493B1 (fr
EP0640493A3 (fr
Inventor
Helmut Dr. Steininger
Alan Dr. Green
Michel Dr. Munch
Peter Dr. Heilmann
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.)
Emtec Magnetics GmbH
Original Assignee
BASF Magnetics GmbH
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
Application filed by BASF Magnetics GmbH filed Critical BASF Magnetics GmbH
Publication of EP0640493A2 publication Critical patent/EP0640493A2/fr
Publication of EP0640493A3 publication Critical patent/EP0640493A3/fr
Application granted granted Critical
Publication of EP0640493B1 publication Critical patent/EP0640493B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
    • B41M3/14—Security printing
    • B41M3/148—Transitory images, i.e. images only visible from certain viewing angles
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C5/00—Photographic processes or agents therefor; Regeneration of such processing agents
    • G03C5/08—Photoprinting; Processes and means for preventing photoprinting
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
    • G03G21/04—Preventing copies being made of an original
    • G03G21/043—Preventing copies being made of an original by using an original which is not reproducible or only reproducible with a different appearence, e.g. originals with a photochromic layer or a colour background
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S428/00—Stock material or miscellaneous articles
    • Y10S428/913—Material designed to be responsive to temperature, light, moisture
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S428/00—Stock material or miscellaneous articles
    • Y10S428/914—Transfer or decalcomania
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
    • Y10T428/24826—Spot bonds connect components
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
    • Y10T428/24851—Intermediate layer is discontinuous or differential
    • Y10T428/24868—Translucent outer layer
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]

Definitions

  • the invention relates to an anti-copying film for covering documents, consisting of a film of transparent material in the size of the document to be covered or parts thereof, which has a sawtooth-shaped structure towards the document to be covered, areas of an optically thinner medium than the film material, so that the Film appears to be opaque in an angular area corresponding to the plan view due to total reflection at the sawtooth-shaped interface and appears translucent in deviating viewing angle areas.
  • US-A-3887742 describes an anti-copying film of the type described above.
  • the film which is intended to make documents non-copyable, consists of transparent plastic film, which has a sawtooth-shaped structure.
  • the area created by the structure contains an optically thinner medium that is either limited by the material and document, or entirely by the material. Due to the total reflection caused by the structure in the angular range of the exposure of a copying machine, the film appears opaque during the copying process, but deviates from this angular range, for example when reading, but is transparent.
  • This anti-copying film has the disadvantage of being able to bypass the copy protection by placing a second anti-copying film at least approximately identical to the anti-copying film.
  • the present invention is therefore based on the object of developing an anticopy film in which the effectiveness of the copy protection cannot be undone.
  • the solution to the problem consists in an anticopy film of the type described at the outset, in which, according to the invention, the sawtooth-shaped structure is at least partially irregular.
  • FIG. 1 shows a sawtooth structure 3 adjacent to document 1, which has different symmetry in the rise 9 and fall 12 of the toothing, primarily asymmetrically and in the rise of the flanks 9 perpendicular to the beam path. This enables a viewer 8 to have a complete overview of the document 1 in an angular range 6.
  • the unusability of copies of the document 1 arises from total reflection at the interfaces to the optically thinner medium 4 in an angular range 5 which corresponds to that of a conventional copier 7.
  • the sawtooth structure 3 does not have to be symmetrical and uniform with respect to period length 13, depth 14 of the structure, rise 9 and fall 12 of the flanks, as in the above-mentioned document. It can vary in these parameters.
  • the increased copy security is achieved in that the period length 13 of the sawtooth structure 3 is statistically distributed, preferably of a short length.
  • the depth 14 of the structure 3 varies statistically by certain values, a small depth is preferred in order to keep the film thickness as small as possible and to optimize the imaging quality.
  • the rise 9 and fall 12 of the sawtooth flanks vary with the beam path of the direction of observation, a perpendicular or parallel arrangement to this representing the optimum of the imaging quality.
  • the film according to the invention there is no longer any possibility of bypassing the copy protection by placing a corresponding second film, since the statistical distribution of these parameters prevents the production of such a second film. The document cannot therefore be copied with sufficient quality.
  • the exemplary embodiment according to FIG. 2 includes a modification of the structure in such a way that the sawtooth structure 3 is now completely enclosed by the film material 2, that is to say it runs internally.
  • Document 1 can now be advantageously applied to a flat surface 15.
  • the exemplary embodiment according to FIG. 3 includes a modification of the film in such a way that the surface 11 of the film 2 is preferably roughened perpendicular to the sawtooth structure 3. This means that the effectiveness of the copy protection can not be canceled even with a symmetrical course of the sawtooth structure 3. In this way, despite the second, almost identical anti-copying film, the copy protection is effectively maintained.
  • the exemplary embodiment according to FIG. 4 describes an anti-copying film in which the imaging ability of the film 2 is optimized for the viewer 8 by sawtooth structures 3, 3 'on both sides. This is achieved by an approximately perpendicular course of the rising flanks 9 of the sawtooth to the beam path.
  • the beam is not deflected, and viewer 8 can view document 1 without loss of intensity due to partial reflection and image changes by refraction. Total reflection occurs at least in areas that distort document 1 or blacken the copy due to reflection of the copying light and thus render the copies unusable.
  • FIGS. 5 and 6 represent an anticopy film 2, in which adhesive 17, 18 is located on the side of the anticopy film 2 facing the document for fastening the film to the document 1. Since the copy protection is based on total reflection at the interfaces of the sawtooth 3, where there is a necessary refractive index jump, any application of the adhesive is not possible. Adhesive is preferably applied only over part of the surface, in particular in a dot shape (FIG. 5) or in a strip shape (FIG. 6). In the exemplary embodiment in FIG. 5, the adhesive spots 17 are randomly distributed with a low density, preferably 0.15 ⁇ mm ⁇ 2 and smaller Size, preferably 0.5 mm in diameter ⁇ applied.
  • the distance between the strips 18 is small, preferably 15 mm.
  • the strips which are also about 0.5 mm wide, run transversely to the course of the saw tooth, preferably at an angle of 90 °.
  • the anti-copying film according to the invention makes it possible to increase the copy security and at the same time the legibility of the document covered thereby.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Cleaning In Electrography (AREA)
EP94112693A 1993-08-24 1994-08-13 Feuille anticopie Expired - Lifetime EP0640493B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4328413 1993-08-24
DE4328413A DE4328413A1 (de) 1993-08-24 1993-08-24 Antikopierfilm

Publications (3)

Publication Number Publication Date
EP0640493A2 true EP0640493A2 (fr) 1995-03-01
EP0640493A3 EP0640493A3 (fr) 1995-06-28
EP0640493B1 EP0640493B1 (fr) 1996-05-15

Family

ID=6495880

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94112693A Expired - Lifetime EP0640493B1 (fr) 1993-08-24 1994-08-13 Feuille anticopie

Country Status (3)

Country Link
US (1) US5569522A (fr)
EP (1) EP0640493B1 (fr)
DE (2) DE4328413A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997010107A1 (fr) * 1995-09-13 1997-03-20 Handelman, Joseph, H. Protection d'un article
US6712397B1 (en) 1998-10-02 2004-03-30 Giesecke & Devrient Gmbh Embossed data carrier
WO2010100360A1 (fr) * 2009-03-04 2010-09-10 Oberthur Technologies Element de securite pour document-valeur

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19749789A1 (de) * 1997-11-11 1999-05-12 Bundesdruckerei Gmbh Sicherheitsmerkmal für ein Wert- oder Sicherheitsdokument mit fraktalem Lamellensystem
EP2009634A1 (fr) * 2000-12-14 2008-12-31 ECD Systems, Inc. Systèmes et procédés de modification de support optique
DE10129939B4 (de) * 2001-06-20 2006-06-22 Ovd Kinegram Ag Optisch variables Flächenmuster
US7716485B2 (en) 2002-02-01 2010-05-11 Sca Ipla Holdings Inc. Systems and methods for media authentication
US20050141095A1 (en) * 2003-12-29 2005-06-30 Youngtack Shim Reflecting sheet
GB0504959D0 (en) † 2005-03-10 2005-04-20 Rue International De La Ltd Security device based on customised microprism film

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3887742A (en) * 1972-04-13 1975-06-03 Richard E Reinnagel Copy resistant documents

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4025673A (en) * 1972-04-13 1977-05-24 Reinnagel Richard E Method of forming copy resistant documents by forming an orderly array of fibers extending upward from a surface, coating the fibers and printing the coated fibers and the copy resistant document resulting from said method
US4184700A (en) * 1975-11-17 1980-01-22 Lgz Landis & Gyr Zug Ag Documents embossed with optical markings representing genuineness information
US4303307A (en) * 1977-10-27 1981-12-01 Al Tureck Copy security system
US4786084A (en) * 1985-11-18 1988-11-22 Copyguard, Inc. Volumetric holographic photocopy prevention film

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3887742A (en) * 1972-04-13 1975-06-03 Richard E Reinnagel Copy resistant documents

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997010107A1 (fr) * 1995-09-13 1997-03-20 Handelman, Joseph, H. Protection d'un article
US6712397B1 (en) 1998-10-02 2004-03-30 Giesecke & Devrient Gmbh Embossed data carrier
WO2010100360A1 (fr) * 2009-03-04 2010-09-10 Oberthur Technologies Element de securite pour document-valeur
FR2942811A1 (fr) * 2009-03-04 2010-09-10 Oberthur Technologies Element de securite pour document-valeur.
AU2010219575B2 (en) * 2009-03-04 2013-03-28 Oberthur Fiduciaire Sas Security element for a value document
RU2537831C2 (ru) * 2009-03-04 2015-01-10 Обертур Техноложи Элемент защиты для ценного документа

Also Published As

Publication number Publication date
DE4328413A1 (de) 1995-03-02
EP0640493B1 (fr) 1996-05-15
DE59400281D1 (de) 1996-06-20
EP0640493A3 (fr) 1995-06-28
US5569522A (en) 1996-10-29

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