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WO1993022146A1 - Procede d'impression en taille douce et document protege possedant une image optique variable - Google Patents

Procede d'impression en taille douce et document protege possedant une image optique variable Download PDF

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Publication number
WO1993022146A1
WO1993022146A1 PCT/US1993/003697 US9303697W WO9322146A1 WO 1993022146 A1 WO1993022146 A1 WO 1993022146A1 US 9303697 W US9303697 W US 9303697W WO 9322146 A1 WO9322146 A1 WO 9322146A1
Authority
WO
WIPO (PCT)
Prior art keywords
design
lines
set forth
document
intaglio printing
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.)
Ceased
Application number
PCT/US1993/003697
Other languages
English (en)
Inventor
Claude Trapletti
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.)
Oberthur Fiduciaire SAS
Original Assignee
Francois Charles Oberthur Group
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 Francois Charles Oberthur Group filed Critical Francois Charles Oberthur Group
Publication of WO1993022146A1 publication Critical patent/WO1993022146A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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

Definitions

  • the present invention relates to an improved method of providing a security feature to documents via intaglio printing and to the secure documents produced thereby. More particularly, the process allows the imprinting of a reflective security message which is immediately apparent to a casual observer, but which is not reflective in either a photocopy or a facsimile. The method avoids the use of photolithographic techniques to provide document security.
  • U.S. Patent Nos. 4,227,720 and 4,310,180 disclose a system for protecting photolithographically prepared documents which employs a masked warning mark that is said to clearly appear only on copies due to the inability of color copiers to integrate a composite pattern of big and little dots. On the original document, the mark is at least partially concealed from the casual observer.
  • the system utilizes a mask having small dots of color density below the color reproductive density of the copier, while the overlay of the mask and warning phrase has large dots of color density that exceeded the color reproductive density of the copier.
  • the object is to make a document in which the ability to discern the image portion from the background varies noticeably depending upon the angle of view and the orientation of the document, a characteristic not passed on to copies of the document.
  • Both latent and transient images can be used to achieve this object. As viewed from a direction normal to the document surface, the latent image blends visually with the background. However, when the document is viewed at an acute angle to its surface, the latent image is readily recognizable in contrast to the background. The transient image is discernable when the document is viewed from a direction normal to its surface but disappears as the angle of view becomes acute.
  • Another goal of this invention is to print an original design or pattern onto secure documents so as to enable the public to immediately determine the authenticity of the documents by simple naked eye inspection. This objective is accomplished through the creation of a variable optical image through intaglio printing with reflective ink, as discussed further below.
  • the invention which can be used independent of or in combination with other security techniques, counteracts the attempts of counterfeiters to use photographic, color copier techniques, facsimiles, or scanning devices to counterfeit documents.
  • the present invention also eliminates the need for a separate photolithographic process to be used in conjunction with the intaglio printing process to provide additional security features.
  • the invention is directed to the imprinting of a pattern with reflective intaglio ink onto a substrate, such as paper, so that an embossed or raised effect is achieved, without the creation of stress on the substrate.
  • a substrate such as paper
  • the utilization of reflective ink permits light to be reflected off of the sides of each of the raised impressions.
  • Another benefit of this process includes the longevity of the produced documents, specifically that the creation of ink buildup via the intaglio process will not flatten, unlike the products made by simple embossing, but rather will retain its initial raised configuration and thereby retain its self- authenticating features. There are many uses of this invention.
  • the authenticity of the following types of documents can be verified by simple visual inspection and manipulation when such documents are prepared by the intaglio printing technique of the present invention: 1) printed documents with monetary value, such as banknotes, travelers checks, savings bonds, gas coupons, restaurant tickets, postal and fiscal stamps, checks, bankcards or other credit cards; 2) identification documents, such as passports, identification cards, visas, ownership certificates, stocks, bonds, raw material certificates, titles, birth and death certificates, voting cards, personnel badges, or fiscal vignettes; and 3) ticketing and labeling documents, such as tickets to control the flow or identification of people (e.g., Olympic Games tickets) , lottery or game tickets, travel tickets, or security labels for trademark verification (e.g., to identify champagne) .
  • monetary value such as banknotes, travelers checks, savings bonds, gas coupons, restaurant tickets, postal and fiscal stamps, checks, bankcards or other credit cards
  • identification documents such as passports, identification cards, visas, ownership certificates, stocks, bonds, raw material certificates, titles, birth and death certificates
  • a variation of the above-mentioned uses of the invention permits the integration of a simple message that correlates with another printed element of the security document, for example, the first character of the serial number or the vintage year found on a champagne label may be the hidden message.
  • This list of uses and variations is merely exemplary and not meant to be construed as limiting.
  • FIG. 1 illustrates the prior art intaglio printing process
  • Fig. 2 is an enlarged view of the paper before and after it passes between the impression roller 6 and the plate cylinder 10;
  • Figs. 3a and 3b demonstrate ink placement in horizontal and vertical lines on the intaglio printed document
  • Fig. 4 demonstrates the view at angle A from the side of the flat document, whereby an impressed "T" image design is visible;
  • Fig. 5 demonstrates an alternative view of the document whereby the composite design is obscured
  • Fig. 6 demonstrates yet another alternative view at angle A from the rear of the document whereby the incident light is reflected off of the lines of the background design towards the observer.
  • the ink fountain 1 supplies ink to several intermediate transfer rollers 2 that act to even out the supply flow of ink.
  • a final ink transfer roller 3 which has a geometry that follows the surface of the printing plate 4 then fills the plate with ink.
  • a wiping roller 5 utilizes a chemical wiping system 9 or wiping paper to wipe the excess ink off the surface of a plate or several identical plates 4 , leaving ink in the intaglio portions i.e., those portions which have been etched, of the printing plate 4.
  • Attached to the plate cylinder 10 are one or more identical plates 4 that makeup the design which is to be printed on the paper.
  • the die or matrix of the printing plate 4 which can be composed of copper, steel, or any other metal commonly used by high security engravers for intaglio printing, can be etched to different depths.
  • the metal printing plate is engraved by chemical etching, which consists of exposing the drawing onto a film that itself is later transferred onto a photoresist on the metal plate.
  • chemical etching consists of exposing the drawing onto a film that itself is later transferred onto a photoresist on the metal plate.
  • certain insulated areas of the metal which are protected by exposed photoresist, are not attacked by the acid used in etching and therefore the metal plate remains protected from the acid in these areas.
  • the unexposed photoresist is washed off, and the acid etches into the metal surface of the plate either a tapered or V-shaped format depending upon the width of the lines.
  • a line having the width of .05 mm will render a depth of around 30 microns.
  • An additional factor which effects the depth of the engraving is the • amount of contact time between the acid and the metal plate. As a result, the drawing is etched into the metal printing plate.
  • the highly viscous ink residue resides only in the recesses 11, i.e. intaglio portions, of the engraved printing plate 4.
  • the paper 7, which passes between the pressure cylinder 6 and the plate cylinder 10, is thereby pressed into the ink- filled recesses 11 of the engraved plate 4 so as to replicate the pattern of the plate 4 in a raised impression 8 on the side of the paper adjacent to the printing plate 4.
  • the transfer gives a different result depending on the depth and style of the line on the plate.
  • the ink depth will be 50% of the line impression height, but this depth varies widely depending on the paper.
  • the overall amount of ink may vary between 15 to 50 microns.
  • This invention employs the well-known intaglio printing process as previously described and shown in Figs. 1 and 2, modified as described below.
  • lines of various dimensions and angular positions may be produced on the document, the line dimensions depending upon the width and depth of the lines engraved in the plate.
  • the lines are shown as horizontal and vertical but of course may be set at other angular positions with respect to each other.
  • Depth is defined as the height to which the lines project in a direction perpendicular to the surface of either the substrate or the printing plate.
  • each image is cut using between 30 to 200 lines per inch. Line widths of .002 to .003 inches may be used.
  • Fig. 4 shows a composite design 12 which is made up of an image design 13 bordered by a background design 14.
  • the image design illustrated as a "T" shaped design on Fig. 4 is made up of horizontal lines 15.
  • the background design 14 is made up of vertical lines 16 in the area excluded by the "T" image design 13.
  • the image design 13 and background design 14 are superimposed to form the composite design 12.
  • Reflective inks such as silver ink, which possess mother of pearl, aluminum or any other reflective pigments are utilized in the invention.
  • the finish imparted to the substrate surface by these inks depends upon the overall percentage of reflective pigments in the ink as well as the properties of the document substrate. For example, an ink mixture having 25% aluminum particles will give a shiny, varnished look to a document substrate. Additionally, products that aid in drying or solvents which stabilize the whole ink composition may also be added to the intaglio ink mixture.
  • the utilization of such reflective inks permits light to reflect off of the sides of the raised impressions. As the paper 7 passes through the intaglio printing process of Fig. 2, the composite design 12 is impressed into the document substrate.
  • the relative intensity of the image design with respect to the background design will change. For example, if the observer views the "T" image design 13 from the side of the paper document (i.e. the 3 o'clock position) at angle of view A as shown in Fig. 4, the light incident on the image design 13 is reflected off of the sides of its horizontal lines 15 towards the observer.
  • Angle of view A is the angle between the flat substrate surface and the viewer, which preferably is not equal to 0° or 90°.
  • the vertical lines 16 of the background design 14 will appear darker and substantially blend with the surface since most of the light incident on the background design is reflected away from the observer.
  • the intensity of the "T" design changes because less light is reflected off of the horizontal lines in the direction of the observer.
  • the observer reaches an angular position of 45° with respect to the lines of the image design 13 (i.e. the 1-2 o'clock position)
  • the light reflected from both the image design 13 and the background design 14 towards the observer is substantially equal and the composite design 12 is obscured.
  • Such a perpendicular arrangement affords the best contrast between the image design and background design when the composite design is viewed parallel to either the lines of the image or background designs.
  • the angle between the lines of the image design and background design is changed from 90°, the • resulting contrast becomes more subtle.
  • the chosen angle between image and background lines must be sufficient so that it is possible to view the document in at least one angular position (i.e. clock position) in which most of the light incident on the image design is reflected towards the observer and most of the light incident on the background design is reflected away from the observer thereby making the image design easy to discern.
  • the chosen angle should also satisfy an additional criterium.
  • variable optical image cannot be replicated in documents reproduced by a copier or a facsimile machine, a casual observer can immediately recognize the authenticity of a document based upon, the presence of the variable image.

Landscapes

  • Printing Methods (AREA)

Abstract

L'invention se rapporte à un procédé assurant une caractéristique de protection sur des documents par l'intermédiaire de l'impression en taille-douce, ainsi qu'aux documents produits. Ce procédé permet l'impression d'un message protégé à image optique variable, ce qui donne la possibilité au public de déterminer immédiatement l'authenticité du document d'un simple coup d'÷il, mais cela n'apparaît pas sur une copie du document lorsque celui-ci est photocopié ou transmis par télécopie.
PCT/US1993/003697 1992-04-24 1993-04-19 Procede d'impression en taille douce et document protege possedant une image optique variable Ceased WO1993022146A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US87418792A 1992-04-24 1992-04-24
US07/874,187 1992-04-24

Publications (1)

Publication Number Publication Date
WO1993022146A1 true WO1993022146A1 (fr) 1993-11-11

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1993/003697 Ceased WO1993022146A1 (fr) 1992-04-24 1993-04-19 Procede d'impression en taille douce et document protege possedant une image optique variable

Country Status (1)

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WO (1) WO1993022146A1 (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5772248A (en) * 1995-12-07 1998-06-30 Verify First Technologies, Inc. Document with tamper and counterfeit resistant relief markings
WO1998033658A1 (fr) * 1997-01-29 1998-08-06 Securency Pty. Ltd. Imprime a effet d'intaille reflechissante
WO1998047715A1 (fr) * 1997-04-18 1998-10-29 De La Rue International Limited Structure d'image transitoire
EP0967085A1 (fr) * 1998-06-23 1999-12-29 Eastman Kodak Company Formation d'images authentifiées dans une feuille réceptrice
AU733183B2 (en) * 1997-01-29 2001-05-10 Securency International Pty Ltd Printed matter producing reflective intaglio effect
EP1384594A1 (fr) * 2002-07-26 2004-01-28 Banque Nationale De Belgique S.A. Protection contre la falsification de données
US7845566B2 (en) * 2003-04-10 2010-12-07 Giesecke & Devrient Gmbh Security label and method for the production thereof
CN102285266A (zh) * 2010-06-02 2011-12-21 施乐公司 增强文件鉴别的方法以及具有增强安全性的文件
EP3045972B1 (fr) 2011-10-11 2017-09-27 De La Rue International Limited Dispositifs de sécurité et procédés pour leur fabrication

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4033059A (en) * 1972-07-06 1977-07-05 American Bank Note Company Documents of value including intaglio printed transitory images
US4066280A (en) * 1976-06-08 1978-01-03 American Bank Note Company Documents of value printed to prevent counterfeiting

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4033059A (en) * 1972-07-06 1977-07-05 American Bank Note Company Documents of value including intaglio printed transitory images
US4066280A (en) * 1976-06-08 1978-01-03 American Bank Note Company Documents of value printed to prevent counterfeiting

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5772248A (en) * 1995-12-07 1998-06-30 Verify First Technologies, Inc. Document with tamper and counterfeit resistant relief markings
WO1998033658A1 (fr) * 1997-01-29 1998-08-06 Securency Pty. Ltd. Imprime a effet d'intaille reflechissante
AU733183B2 (en) * 1997-01-29 2001-05-10 Securency International Pty Ltd Printed matter producing reflective intaglio effect
AU733183C (en) * 1997-01-29 2005-01-20 Securency International Pty Ltd Printed matter producing reflective intaglio effect
US7029733B2 (en) 1997-01-29 2006-04-18 Securency Pty Ltd Printed matter producing reflective intaglio effect
WO1998047715A1 (fr) * 1997-04-18 1998-10-29 De La Rue International Limited Structure d'image transitoire
EP0967085A1 (fr) * 1998-06-23 1999-12-29 Eastman Kodak Company Formation d'images authentifiées dans une feuille réceptrice
US6121991A (en) * 1998-06-23 2000-09-19 Eastman Kodak Company Forming authenticated images in a receiver
EP1384594A1 (fr) * 2002-07-26 2004-01-28 Banque Nationale De Belgique S.A. Protection contre la falsification de données
US7845566B2 (en) * 2003-04-10 2010-12-07 Giesecke & Devrient Gmbh Security label and method for the production thereof
CN102285266A (zh) * 2010-06-02 2011-12-21 施乐公司 增强文件鉴别的方法以及具有增强安全性的文件
EP3045972B1 (fr) 2011-10-11 2017-09-27 De La Rue International Limited Dispositifs de sécurité et procédés pour leur fabrication

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