WO1998047715A1 - Structure d'image transitoire - Google Patents

Structure d'image transitoire Download PDF

Info

Publication number
WO1998047715A1
WO1998047715A1 PCT/GB1998/001090 GB9801090W WO9847715A1 WO 1998047715 A1 WO1998047715 A1 WO 1998047715A1 GB 9801090 W GB9801090 W GB 9801090W WO 9847715 A1 WO9847715 A1 WO 9847715A1
Authority
WO
WIPO (PCT)
Prior art keywords
image
markings
structure according
physical characteristic
lines
Prior art date
Application number
PCT/GB1998/001090
Other languages
English (en)
Inventor
Rosemary Trinder
Martin Raishbrook
Colin Norman Shenton
Original Assignee
De La Rue International Limited
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 De La Rue International Limited filed Critical De La Rue International Limited
Priority to CA002286551A priority Critical patent/CA2286551A1/fr
Priority to DE69804086T priority patent/DE69804086T2/de
Priority to EP98917362A priority patent/EP0975467B1/fr
Priority to AU70604/98A priority patent/AU7060498A/en
Publication of WO1998047715A1 publication Critical patent/WO1998047715A1/fr

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
    • 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
    • B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
    • B42D25/29—Securities; Bank notes
    • B42D2035/16—

Definitions

  • the invention relates to a transitory image structure and a method for generating a transitory image.
  • Transitory images are images which can only be seen from certain angles of viewing. Commonly, these comprise latent images which cannot be seen when the structure is viewed normally but can be seen at certain off-normal angles, and transient images which can be seen when the structure is viewed normally but not at certain off -normal angles.
  • Transitory images, particularly latent images are particularly useful as security features on documents of value and security documents and can also be used as anti- counterfeiting devices.
  • US-A-4033059 discloses a variety of latent image structures formed by intaglio printing and intended for this purpose.
  • transitory image structures comprise linear markings on a substrate, the linear markings defining image and background portions respectively, the markings cooperating together such that an image generated by the image portion is not visible from all viewing angles.
  • a transitory image structure comprises linear markings on a substrate, the linear markings defining image and background portions respectively, the markings cooperating together such that an image generated by the image portion is not visible from all viewing angles and is characterised in that at least some of the lines of the markings of at least one of the portions have a physical characteristic which varies in a substantially random manner along their lengths .
  • linear markings for one and preferably both of the image and background portions in which a physical characteristic, for example width or depth, of at least some of (and preferably all) the linear markings varies in a substantially random manner, produces a very flat or uniform appearance when the structure is viewed at angles at which the transitory image should not be visible, considerably improving upon the problems outlined above.
  • the structure presents a speckled appearance without any indication of the presence of the transitory image.
  • the invention can be used to generate a transient image, it is particularly suitable for generating latent images and the following description ' will concentrate on that aspect .
  • changes in the physical characteristic of the linear markings of the at least one portion occur at substantially random intervals and the physical characteristic of the linear markings of the at least one portion has a dimension which varies in a substantially random manner. This results in maximising concealment of the transitory image. However, in some cases, only one of these changes could be implemented.
  • the linear markings will be substantially parallel and preferably are rectilinear.
  • the lines of the image portion are not parallel to the lines of the background portion. However, in some cases, both sets of lines could be parallel.
  • linear markings forming substantially concentric polygons such as octagons.
  • a single set of concentric polygons could form the first and second sets of linear markings, or the two sets of linear markings could be defined by different groups of concentric polygons.
  • the markings will be defined by relief elements such as may be produced by intaglio printing or embossing, including blind embossing.
  • the markings may be surface printed on the substrate, for example by offset or lithographic printing.
  • the surface of the substrate which carries the structure may be colour coated with one or a number of colours or be specularly metallised.
  • the structure may be incorporated into a variety of authenticatable items such as banknotes, printed monetary tokens, travellers cheques, bonds, visas, certificates, vouchers, passes, tickets, passport pages, printed paper or film seals, and tamper evident labels or tags. It is particularly aimed as a visually detectable feature for use against counterfeiting.
  • the structure is particularly suitable for incorporation into documents such as banknotes during the intaglio printing process.
  • the intaglio plate having the mould for imparting the three dimensional effect may carry ink or it may be ink free.
  • the structure will be formed on an area of paper such as security printable document grade paper during an intaglio printing process. If the structure is to be printed by the application of intaglio ink then this will generally be to an absorbent surface comprising cellulosic paper fibres or the like.
  • the area onto which the structure is to be formed may previously have been printed by lithography or the like to form an evenly coloured or lustrous background.
  • the intaglio impression may be made in the so-called "blind" embossing style in which no ink is applied to the recesses in the plate corresponding to the device indentations.
  • the surface to be embossed will preferably be glossy or specularly reflecting such as may be found by the sheen exhibited by a metallic effect printing ink, or the mirror reflectivity exhibited by a metallised film, or indeed the optical variability induced by the diffraction of light such as in white light viewable holograms, multiple layer light interference coatings and the like.
  • the area of the substrate to be embossed with the structure should be substantially planar and capable of being deformed in accordance with the shape of the mould.
  • a particular advantage of the transitory image structure according to the invention is that it presents the appearance of a random screen even at close viewing distances while at greater distances it will appear as a continuously coloured patch. This allows the structure to be incorporated into other designs on the substrate in such a way that even the presence of the structure is difficult to discern.
  • linear markings will normally be continuous, they could be discontinuous and formed, for example, by discrete dots.
  • the parallel line sets may slightly diverge and optionally the maximum permitted width of the random widening may be caused to vary along the length of the lines.
  • the transitory image structure can be generated in a variety of conventional ways, typically by generating a suitable screen of linear markings having the random variation required and then superimposing that screen on a conventional transitory image pattern. This can conveniently be done using conventional computer aided design systems, intaglio plates or the like then being created from the resultant combined pattern.
  • the intaglio plate will be therefore provided with a fine, uneven textured pattern which will appear to be essentially random.
  • In part of the area will be the parallel line pattern which causes the transitory image effect when the device is tilted.
  • the parallel line set will generally form a simple image such as a number, a letter or a symbol which will be revealed at certain angles of viewing.
  • the parallel line set image may be substantially even, in that the depth of the lines does not change.
  • the lines may themselves exhibit a small degree of speckle with a periodicity similar to that of the background lines.
  • the line sets could be formed as a matrix of miniature parallel line sets of random thickness, the sets having different orientations of the parallel line sets.
  • a method of generating a transitory image comprises generating digital data defining linear markings at least some of which have a physical characteristic which varies in a substantially random manner along their lengths; and combining the linear markings with image and background data to generate data defining image and background portions of the transitory image.
  • the linear markings are generated digitally, typically using a computer programme, which allows considerable freedom in choosing the manner in which the screen is defined.
  • the form of the linear markings with a varying physical characteristic is determined by: a) i) determining for each segment of the line whether or not it should have the same value of the physical characteristic as the preceding segment; and, if not, ii) generating a new width value for the segment, and, b) generating data in accordance with the determined physical characteristic value, wherein one or both of steps a) i) and ii) are carried out in a substantially random manner.
  • the physical characteristic variation (usually width or depth) will be constrained within maximum and minimum limits.
  • the same algorithm will be used to generate the linear markings for the image portion and for the background portion.
  • Figure 1 illustrates in enlarged form an example of part of a set of linear markings
  • Figure 2 is a flow diagram of the algorithm for generating the linear markings shown in Figure 1;
  • Figure 3 illustrates in enlarged form the appearance of a latent image structure utilizing the linear markings shown in Figure 1;
  • Figure 4 illustrates the appearance of an example of a latent image structure according to the invention when viewed normally.
  • the invention is primarily concerned with the generation of linear markings having a width which varies in a substantially random manner along its length. However, a variation in depth or some other physical characteristic is also envisaged.
  • Figure 1 illustrates a small portion of a set of linear markings suitable for constructing a transitory image structure, in considerably enlarged form. As can be seen in Figure 1, the linear markings 1-10 have centre lines which are substantially parallel but each exhibits changes in width which occur at substantially random intervals and between substantially random width values .
  • a computer is suitably programmed to generate digital data defining lines composed of successive short elements typically having a minimum length of 0.075mm, the width of each element being defined by the program parameters.
  • Figure 2 illustrates a flow diagram of an example of a computer programme for achieving this.
  • the line spacing between the centre lines of adjacent linear markings is set.
  • a typical example is in the range 0.2-0.5mm centre-to-centre, commonly 0.25mm.
  • the operator enters the minimum and maximum widths which each line may have, typically, in the range 50-200 microns. He also enters a decision threshold T in the range 0.1-0.9.
  • the computer then commences the generation of the line starting from a predetermined initial width value (step 22) .
  • a second random number RND2 is inspected (step 25) . This also varies between 0 and 1.0 and the computer determines in a step 26 the value of the new width by using the value of RND2 to define a fraction of the range between the previously set Max and Min widths.
  • the new width could be determined from RND2 in some other way, for example by using RND2 as an address into a previously defined look-up table of widths.
  • the next element is generated (step 27) with a width corresponding to the selected new width. If in step 24 it was found that RND1 was not greater than T then the next element would be generated with a width value corresponding to the previously selected width, in other words the same width as the previous element .
  • a step 28 the computer determines whether or not the end of the line has been reached and if it has not then steps 23-27 are repeated.
  • bit map is then used to construct an intaglio plate, the appearance of that plate and hence the transitory image structure being illustrated in an enlarged form in Figure
  • the transitory image structure defined by the plate comprises a background portion 30 defined by vertical lines and image portions 31,32 defined by horizontal lines, together forming a "head and shoulders" image.
  • the lines forming both the background and image portions 30-32 each have a similar random width variation and line spacing although this is not essential.
  • the background portion 30 could be defined by horizontal lines and the image portions 31,32 by vertical lines.
  • the intaglio plate can then be used to print or blind emboss the structure onto a substrate such as a banknote or the like.
  • a substrate such as a banknote or the like.
  • the structure could also include a pattern which is visible from substantially all viewing angles. This could be produced by controlling the background linear markings to have a width of particular value in the predetermined pattern.

Landscapes

  • Business, Economics & Management (AREA)
  • Accounting & Taxation (AREA)
  • Finance (AREA)
  • Printing Methods (AREA)
  • Credit Cards Or The Like (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

Structure d'image transitoire composée de marques linéaires (1-10) sur un substrat. Ces marques linéaires définissent des parties respectives d'image (31, 32) et d'arrière-plan (30) et coopèrent les unes avec les autres, de sorte qu'une image générée par la partie d'image n'est pas visible depuis tous les angles de visualisation. Au moins quelques unes des lignes des marques d'au moins une des parties possèdent une caractéristique physique, telle que l'épaisseur, variant sensiblement au hasard sur leurs longueurs respectives.
PCT/GB1998/001090 1997-04-18 1998-04-15 Structure d'image transitoire WO1998047715A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CA002286551A CA2286551A1 (fr) 1997-04-18 1998-04-15 Structure d'image transitoire
DE69804086T DE69804086T2 (de) 1997-04-18 1998-04-15 Transientbildstruktur
EP98917362A EP0975467B1 (fr) 1997-04-18 1998-04-15 Structure d'image transitoire
AU70604/98A AU7060498A (en) 1997-04-18 1998-04-15 Transitory image structure

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9707849A GB9707849D0 (en) 1997-04-18 1997-04-18 Structure
GB9707849.7 1997-04-18

Publications (1)

Publication Number Publication Date
WO1998047715A1 true WO1998047715A1 (fr) 1998-10-29

Family

ID=10810968

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1998/001090 WO1998047715A1 (fr) 1997-04-18 1998-04-15 Structure d'image transitoire

Country Status (7)

Country Link
EP (1) EP0975467B1 (fr)
AU (1) AU7060498A (fr)
CA (1) CA2286551A1 (fr)
DE (1) DE69804086T2 (fr)
ES (1) ES2174430T3 (fr)
GB (1) GB9707849D0 (fr)
WO (1) WO1998047715A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003068522A1 (fr) * 2002-02-15 2003-08-21 Ascent Systems Software Limited Impression de securite
WO2004043189A1 (fr) * 2002-11-12 2004-05-27 Koninklijke Nederlandse Munt N.V. Image de piece de monnaie composee de caracteristiques
WO2005070693A1 (fr) 2004-01-21 2005-08-04 De La Rue International Limited Dispositif de securite
WO2008049566A2 (fr) * 2006-10-23 2008-05-02 Giesecke & Devrient Gmbh Élément de sécurité doté d'une structure à effet optique variable
EP1928669A1 (fr) * 2005-09-29 2008-06-11 De La Rue International Limited Dispositif de sécurité destiné à des substrats de sécurité
US8100436B2 (en) 2004-08-13 2012-01-24 Giesecke & Devrient Gmbh Data support with an optically variable structure
EP2439078A3 (fr) * 2010-10-08 2013-05-01 Giesecke & Devrient GmbH Support de données doté de lignes de coupe

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008100172A1 (fr) * 2007-02-15 2008-08-21 Zuev, Boris Alexandrovich Procédé de fabrication d'articles imprimés comprenant plusieurs images cachées (et variantes) et articles imprimés fabriqués par ce procédé

Citations (5)

* 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
EP0146151A1 (fr) * 1983-11-16 1985-06-26 De La Rue Giori S.A. Papier valeur
WO1990002658A1 (fr) * 1988-09-09 1990-03-22 The De La Rue Company Plc Dispositif de securite
WO1993022146A1 (fr) * 1992-04-24 1993-11-11 Francois-Charles Oberthur Group Procede d'impression en taille douce et document protege possedant une image optique variable
GB2283456A (en) * 1993-11-04 1995-05-10 Moore Business Forms Inc Security printed document

Patent Citations (5)

* 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
EP0146151A1 (fr) * 1983-11-16 1985-06-26 De La Rue Giori S.A. Papier valeur
WO1990002658A1 (fr) * 1988-09-09 1990-03-22 The De La Rue Company Plc Dispositif de securite
WO1993022146A1 (fr) * 1992-04-24 1993-11-11 Francois-Charles Oberthur Group Procede d'impression en taille douce et document protege possedant une image optique variable
GB2283456A (en) * 1993-11-04 1995-05-10 Moore Business Forms Inc Security printed document

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003068522A1 (fr) * 2002-02-15 2003-08-21 Ascent Systems Software Limited Impression de securite
WO2004043189A1 (fr) * 2002-11-12 2004-05-27 Koninklijke Nederlandse Munt N.V. Image de piece de monnaie composee de caracteristiques
WO2005070693A1 (fr) 2004-01-21 2005-08-04 De La Rue International Limited Dispositif de securite
US8100436B2 (en) 2004-08-13 2012-01-24 Giesecke & Devrient Gmbh Data support with an optically variable structure
EP1928669A1 (fr) * 2005-09-29 2008-06-11 De La Rue International Limited Dispositif de sécurité destiné à des substrats de sécurité
EP1928669B1 (fr) * 2005-09-29 2012-03-14 De La Rue International Limited Dispositif de sécurité destiné à des substrats de sécurité
WO2008049566A2 (fr) * 2006-10-23 2008-05-02 Giesecke & Devrient Gmbh Élément de sécurité doté d'une structure à effet optique variable
WO2008049566A3 (fr) * 2006-10-23 2008-09-18 Giesecke & Devrient Gmbh Élément de sécurité doté d'une structure à effet optique variable
EP2439078A3 (fr) * 2010-10-08 2013-05-01 Giesecke & Devrient GmbH Support de données doté de lignes de coupe

Also Published As

Publication number Publication date
CA2286551A1 (fr) 1998-10-29
EP0975467A1 (fr) 2000-02-02
AU7060498A (en) 1998-11-13
GB9707849D0 (en) 1997-06-04
EP0975467B1 (fr) 2002-03-06
DE69804086T2 (de) 2002-08-01
DE69804086D1 (de) 2002-04-11
ES2174430T3 (es) 2002-11-01

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