EP0650853B1 - Process for obtaining double picture prints on hard surfaces - Google Patents

Process for obtaining double picture prints on hard surfaces Download PDF

Info

Publication number
EP0650853B1
EP0650853B1 EP93500148A EP93500148A EP0650853B1 EP 0650853 B1 EP0650853 B1 EP 0650853B1 EP 93500148 A EP93500148 A EP 93500148A EP 93500148 A EP93500148 A EP 93500148A EP 0650853 B1 EP0650853 B1 EP 0650853B1
Authority
EP
European Patent Office
Prior art keywords
faces
furrows
angle
reliefs
bas
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.)
Expired - Lifetime
Application number
EP93500148A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0650853A1 (en
Inventor
José Luis Diaz Salas
Julián Zamorano de Blas
José Latorre Barrena
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.)
Fabrica Nacional de Moneda y Timbre
Original Assignee
Fabrica Nacional de Moneda y Timbre
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 Fabrica Nacional de Moneda y Timbre filed Critical Fabrica Nacional de Moneda y Timbre
Priority to AT93500148T priority Critical patent/ATE159208T1/de
Priority to DK93500148.7T priority patent/DK0650853T3/da
Priority to EP93500148A priority patent/EP0650853B1/en
Priority to DE69314640T priority patent/DE69314640T2/de
Publication of EP0650853A1 publication Critical patent/EP0650853A1/en
Application granted granted Critical
Publication of EP0650853B1 publication Critical patent/EP0650853B1/en
Priority to GR970403379T priority patent/GR3025730T3/el
Priority to HK98103135A priority patent/HK1004064A1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B44—DECORATIVE ARTS
    • B44C—PRODUCING DECORATIVE EFFECTS; MOSAICS; TARSIA WORK; PAPERHANGING
    • B44C1/00—Processes, not specifically provided for elsewhere, for producing decorative surface effects
    • B44C1/24—Pressing or stamping ornamental designs on surfaces
    • A—HUMAN NECESSITIES
    • A44—HABERDASHERY; JEWELLERY
    • A44C—PERSONAL ADORNMENTS, e.g. JEWELLERY; COINS
    • A44C21/00—Coins; Emergency money; Beer or gambling coins or tokens, or the like
    • 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
    • B42D25/324—Reliefs

Definitions

  • the present invention relates to a process for obtaining double picture prints on any kind of hard surface, which process is particularly useful as a security system and a constituent element in designing coins, medals and the like, so that the said process allows two different pictures to be viewed on the same relief, being alternately visible depending upon the impingement of the light, i.e. one of the pictures will be visible in a given position and on tilting the piece slightly the said picture will be concealed and the other will come to light.
  • the double picture print system prevents the coins from being copied using matrix systems traditionally used in counterfeiting.
  • the visual checking of the genuineness of a coin depends upon the quality of the prints, that can in certain copies be very high.
  • a method that is often used in the fraudulent manufacture of coin moulds and which yields good results, is electroerosion, though this method is limited to prints with certain minimum dimensions, below which the method cannot be applied, bearing in mind that the size of the spark produced in turn limits such dimensions.
  • the process for obtaining double picture prints upon hard surfaces subject of the invention comprises initially making a relief formed by a mesh of straight and parallel furrows the side walls of which are at a particular angle to the general plane of the hard surface in question, viz. the said mesh has a triangular, preferably isosceles, section.
  • Each of the two pictures to be obtained is formed by all the walls pointing in the save direction, i.e. one of the walls in each and every furrow, that pointing in the same direction, is the base for representing a drawing, whereas the other wall shall in turn provide the base for representing the other drawing.
  • each of these two drawings is in turn defined by a variation in the degree of inclination of certain areas or each of the respective walls, which inclination is considerably greater to the general plane of the hard surface being treated.
  • the resolution of the picture shall depend directly upon the number of furrows used in the print, and their relief shall be dependent upon the type of minting, size of the print, distance between the furrows and inclination of its walls.
  • the height and spacing of the furrows will be as little as technically feasible, which will moreover expedite minting.
  • the process for obtaining double picture prints subject hereof comprises first of all providing the hard surface at issue, for instance the operating surface of a coin minting core, with a plurality of straight and parallel furrows (1) of dihedral shape and preferably having a triangular isosceles section, taking up fully the surface at issue, so that each of the furrows define two walls (2) and (3), with a different inclination, one of the walls (2) of such furrows having an identical inclination to the rest, as with the other wall, numbered (3).
  • the drawing on the faces (2) is obtained by establishing bas-reliefs (4) on such surfaces, where the inclination of such respective walls (2) and (3) is considerably greater with regard to the general plane of the hard surface at issue, as can be seen perfectly in the figure.
  • the resolution of the picture shall depend directly upon the number of furrows (1) to be used in the print.
  • the said number of furrows will be preferably six per millimetre and to provide the coin surface with such furrows a burin or cutting tool will be used with its faces at an angle of 50° to the vertical.
  • the furrows (1) shown in the only figure of the drawings explaining the invention will be formed thus, whereas the bas-reliefs 4-5 shall be provided using another burin or cutting tool having its leading edge chamfered with a cross-section of approximately 0.05 millimetres, i.e. 5 hundredths, the angle of the cutting faces of the said burin being at approximately 25° to the vertical.
  • the distance between the two peaks of two consecutive furrows will be approximately 0.15 millimetres.
  • the print to be made on the die stamp or minting core shall be executed using a computer assisted number control copier milling machine, in which the data concerning the start and end of each print line are inserted. These data, distinguishing hundredths, are obtained by analysing the two drawings previously outlined with the assistance of a CAD program. Printing shall be made using two cutting tools, one having a greater angle for the general mesh and the other a smaller angle and a given point measurement, requiring a great accuracy, for the two motifs.

Landscapes

  • Silver Salt Photography Or Processing Solution Therefor (AREA)
  • Credit Cards Or The Like (AREA)
  • Basic Packing Technique (AREA)
  • Magnetic Record Carriers (AREA)
  • Adhesives Or Adhesive Processes (AREA)
EP93500148A 1993-11-02 1993-11-02 Process for obtaining double picture prints on hard surfaces Expired - Lifetime EP0650853B1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
AT93500148T ATE159208T1 (de) 1993-11-02 1993-11-02 Verfahren zum erhalten von zwei druckbildern auf harten oberflächen
DK93500148.7T DK0650853T3 (da) 1993-11-02 1993-11-02 Fremgangsmåde til frembringelse af to billeder på hårde overflader.
EP93500148A EP0650853B1 (en) 1993-11-02 1993-11-02 Process for obtaining double picture prints on hard surfaces
DE69314640T DE69314640T2 (de) 1993-11-02 1993-11-02 Verfahren zum Erhalten von zwei Druckbildern auf harten Oberflächen
GR970403379T GR3025730T3 (en) 1993-11-02 1997-12-22 Process for obtaining double picture prints on hard surfaces.
HK98103135A HK1004064A1 (en) 1993-11-02 1998-04-15 Process for obtaining double picture prints on hard surfaces

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP93500148A EP0650853B1 (en) 1993-11-02 1993-11-02 Process for obtaining double picture prints on hard surfaces

Publications (2)

Publication Number Publication Date
EP0650853A1 EP0650853A1 (en) 1995-05-03
EP0650853B1 true EP0650853B1 (en) 1997-10-15

Family

ID=8214885

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93500148A Expired - Lifetime EP0650853B1 (en) 1993-11-02 1993-11-02 Process for obtaining double picture prints on hard surfaces

Country Status (6)

Country Link
EP (1) EP0650853B1 (da)
AT (1) ATE159208T1 (da)
DE (1) DE69314640T2 (da)
DK (1) DK0650853T3 (da)
GR (1) GR3025730T3 (da)
HK (1) HK1004064A1 (da)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19722575A1 (de) * 1997-05-29 1998-12-03 Matthiesen Miriam Verfahren zum Einprägen von Mikrostrukturen in Metalle oder andere Hartstoffe
RU2188762C2 (ru) * 2000-01-10 2002-09-10 ОАО "Нытва" Биметаллическая композиция медно-никелевый сплав - сталь - медно-никелевый сплав и способ ее изготовления
NL1014733C2 (nl) * 2000-03-23 2001-09-28 Konink Nl Munt N V Munt- of medaillestempel, werkwijze voor het vervaardigen daarvan alsmede munt of medaille.
NL1021905C2 (nl) * 2002-11-12 2004-05-26 Konink Nl Munt N V Muntafbeelding opgebouwd uit karakteristieken.
NL1025511C2 (nl) * 2004-02-18 2005-08-19 Konink Nl Munt N V Werkwijze voor het op een munt/penning aanbrengen van een afbeelding, zo verkregen munt/penning alsmede daarvoor gebruikte matrijs.
EP2554397B1 (en) 2011-08-05 2014-02-12 ALLTEC Angewandte Laserlicht Technologie Gesellschaft mit beschränkter Haftung Embossed structure
EP2594149A1 (en) * 2011-11-18 2013-05-22 Fabrica Nacional De Moneda Y Timbre - Real Casa De La Moneda Object comprising a region of its surface suitable for showing a plurality of images

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE630713A (da) *
DE604690C (de) * 1933-02-16 1934-10-25 Everett John Schwantes Verfahren zum Schutze von an Motorteilen angegossenen Inschriftenplatten gegen Faelschung
DE3618864A1 (de) * 1986-06-04 1987-12-10 Ernst Ing Grad Roethke Alternativ-doppelmotiv-tapete

Also Published As

Publication number Publication date
GR3025730T3 (en) 1998-03-31
ATE159208T1 (de) 1997-11-15
DE69314640D1 (de) 1997-11-20
DK0650853T3 (da) 1997-11-03
DE69314640T2 (de) 1998-02-26
EP0650853A1 (en) 1995-05-03
HK1004064A1 (en) 1998-11-13

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