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
  • B42D25/324—Reliefs
• • 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
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
  • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
  • B41M5/24—Ablative recording, e.g. by burning marks; Spark recording
• • 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
  • B42D25/342—Moiré effects
• • 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
• • 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
  • B42D25/40—Manufacture
  • B42D25/405—Marking
  • B42D25/41—Marking using electromagnetic radiation
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
  • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
  • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used

Definitions

• the invention relates to a method of providing a floating image onto a carrier comprising an array of lenses having a predetermined focal length.
• the known floating image a partial image is formed in the polycarbonate material underlying each lens. These partial images are recombined by the lenses to present a floating image to the viewer. Due to lack of resemblance of the partial images in the array of images to the combined, to the floating image, the known partial images in the carrier are less suitable to serve as an authentication for a security or identity card or document. Furthermore, the known partial images are produced by combined imaging of the laser beam via a projecting lens and the microlenses on the carrier, so that these microlenses affect the image quality of the represented object.
• a method for providing human readable information on a data carrier comprising providing the data carrier having a lens array provided on top of a laser sensitive layer.
• Optical means in negative form of a liquid are provided onto the surface of the lens array to compensate for lens effect of relief during laser writing. Laser writing is performed through the optical means and then optical means is removed. Card surface relief allows information to be viewed from different angles.
• DEI 02010019766 discloses a method for producing a microstructure on a carrier by manufacturing a donor foil by forming an embossed structure with elevations and depressions in a foil material and applying a transfer layer to the embossed structure, forming microstructures.
• a number of micro lenses forming a lens array are applied to the surface of the microstructures, in such a way that the pitch of the microstructures differs slightly from the pitch of the lenses forming the lens array.
• DE102009035413 discloses an identification document having a first image region comprising polycarbonate material being configured to blacken upon laser irradiation is performed.
• the identification document comprises a first and a second image region having an image of a person corresponding to an image region provided in the first image region.
• a security element for security documents comprising a number of laser produced micro elements, forming a security element, that are associated with a number of microlenses. The micro elements are visible when the security element is viewed through the associated microlenses. It is an object of the present invention to provide a method of producing an image on a carrier, utilizing a lens array while reducing effects of the lenses on the image during image formation on the carrier. It is a further object to provide a high quality image formed below the lenses, which image is suitable for use as a security or authentication image on a security object such as a bank card, access card or badge or an identity card or document. Summary of the invention
• the method according to the invention comprises the steps of: - Providing the carrier comprising an array of lenses having a predetermined focal length, a distance between adjacent lenses being P micron,
• a distance between adjacent target areas (25,25';32,32') being L micron, wherein L is different from the distance P,
• the image of the object is composed of pixels (21,22), the pixels of a first image being imaged via a laser (6) onto a
• predetermined target area (25,25') whereafter the carrier (2) is displaced relative to the projection lens system (7) by L micron and the pixels of a subsequent image are imaged onto an adjacent target area (25,25'), and wherein the number of target areas (25,25') is at least 50 x 50.
• the optically active layer By applying the optically active layer during image formation, the combined focal length of the layer and the lenses is increased, preferably to infinity, so that the lenses can be "switched off during production of the image in the carrier layer.
• the lenses can be "switched off during production of the image in the carrier layer.
• it is possible to form an image which is independent of the lens array geometry, which image in the inspection stage is viewed by an inspection person through the lenses. It hereby becomes possible to produce multiple images in the carrier having a different pitch than the pitch of the lenses so that a Moiree magnification effect can be obtained.
• a complete image is formed in each target area.
• the lenses overlying the target areas are covered by the optically active layer and hence do not function to focus the laser beam.
• This allows the formation of an image on each target area with a pitch that differs from the pitch of the lenses.
• a floating, magnified image is formed that may be situated above the carrier if the pitch of the image is smaller than the pitch of the lenses (L ⁇ P) or below the carrier if the pitch of the image is larger than the pitch of the lenses (L>P).
• This so-called Moire magnification is based on forming an array of identical images, the pitch of which in relation to the pitch of the lenses is accurately controlled.
• each target area On each target area, a complete image is formed of the object in the inspection area, so that each target area forms an authentication image for comparing with the object image in the first inspection area and hereby determining its authenticity.
• An inspection person can in this way, for instance by using a simple magnifier, compare each target area image with the inspection image and can notice alterations to the image in the inspection area from this comparison.
• the optically active layer may comprise a liquid such as for instance water, the carrier and the lenses being immersed in the liquid such that the lenses are situated below the liquid surface.
• the liquid may be contained in a reservoir into which the carrier is placed so as to be below the liquid surface. In this way the laser can be focussed onto (or into) the carrier without effect of the lenses, and each pixel of the object image can be imaged onto a corresponding section of the target areas. After forming of the images onto the target areas, the liquid may be drained from the reservoir and the carrier may be removed and dried.
• the image of the object may be composed of pixels, the pixels of a first image being imaged via a laser beam onto a predetermined target area.
• the carrier may be displaced relative to the projection lens system in the x-y direction by L micron and the pixels of a subsequent image are imaged onto an adjacent target area.
• a relevant target area may each time be positioned below the projecting lens system so that it can be impinged on by the laser beam.
• the method of the invention is preferably used for forming an ID document or a security document such as a card or a booklet and the image may be formed by the portrait of the holder of the card or document.
• Suitable material for the image carrier comprises polycarbonate.
• Each target area may have a length and a width of between 100 micrometer and 1000 micrometer.
• the number of target areas may be at least 50 x 50.
• the number of pixels in each target area may be at least 50x50.
• the relative dimensions of L and P may be such that (L-PyP is at least 1%.
• Fig. 1 shows a schematic representation of a method of forming an image on a carrier comprising an array of lenses
• Figs. 2a and 2b show a top view of an image carrier comprising respectively an array of cylindrical and of spherical lenses
• Fig. 3 shows a cross-sectional view of the carrier of fig. 2
• Fig. 4 shows a cross-sectional view of the carrier of fig. 3 combined with an optically active layer covering the lenses
• Figs. 5 and 6 show magnified floating images formed for a pitch of the multiple images on the carrier that is respectively smaller and larger than the pitch of the overlying lenses
• Fig. 7 shows a multiple image formed on a carrier
• Fig. 8 shows a first step in an inspection process by observing and comparing an enlarged floating image with the portrait image or with the face of the bearer of the security document
• Fig. 9 schematically shows as a second step in the inspection process the verification of the authenticity of the portrait image by an inspection person observing a magnified version of the multiple images
• Fig. 10 shows a magnifier used for inspection of the multiple images.
• Fig. 1 shows a movable stepping table 3 that is displaceable by a motor drive 10 in x and y directions by predefined steps of for instance 100 micrometers.
• a carrier 2 is placed comprising an array of lenses 4,4' .
• the carrier 2 may comprise multiple layers made of polycarbonate, polyester, pvc or combinations thereof.
• the lenses 4,4' may be formed by cylindrical lenses or spherical lenses or lenses having any other suitable geometry.
• a laser 6 generates a laser beam that is focussed into a point 8 via a lens system 7.
• the focus point 8 is imaged by the lenses 4,4' into a blackened area 9 of the image carrier 2 where energy dissipated by the laser beam produces a discoloration or blackening of the transparent carrier material.
• a computer 5 controls the laser 6 and the motor drive 10 in such a manner that either interlaced line images are formed with groups of lines 14, 14' below each of the cylinder lenses 4,4' such as schematically shown in fig. 2a, and in accordance with for instance EP 219 012.
• one complete image may be formed each time below each one of the individual spherical lenses 4,4' such as described in WO 2013/090586.
• Fig. 3 shows a parallel bundle 11 being focussed by the lenses 4,4' into the carrier layer 2 at a focal distance f of for instance 50-100 micrometer.
• an optically active layer 13 overlies the lenses 4,4', such that a parallel bundle 12 remains parallel without being focussed by the lenses 4,4'. In this manner it is possible to direct the bundle 12 into the substrate 2 without being influenced by the lenses 4,4' that are later used for viewing of the image by a user.
• Fig. 5 shows an example wherein images 16, 16' are formed in the carrier 2 at a pitch L which is smaller than the pitch P of the lenses 4, 4' .
• a viewer 17 observes an enlarged image 18 that is parallel to the images 16,16' and is located below the carrier 2.
• the pitch L of the images 16,16'in the carrier 2 is larger than the pitch P of the lenses 4,4' such that an image 18 is observed by an inspection person 17 floating above the carrier 2, and being flipped with respect to the images 16, 16'.
• Fig. 7 shows how an image 20 is stored in the image processing memory of computer 5, the image 20 being for instance formed of 50 by 50 pixels 21, 22.
• the carrier 2 defines for instance 50x 50 target areas 25,25', on each target area a complete image 20 consisting of 50x50 pixels being projected via the projection lens system 7, the optically active layer 13 and the lenses 4,4', so that an array of 50x50 micro images are formed at a pitch L.
• the optically active layer 13 which may be formed by a liquid layer such as water, a viewer will observe the multiple images on the target areas 25,25' as a single enlarged image floating above or below the carrier 2.
• Fig. 8 shows a security object 30 such as an identity document or bank card carrying in an inspection area a portrait picture 31, with dimensions of for instance at least lxl cm.
• a security object 30 such as an identity document or bank card carrying in an inspection area a portrait picture 31, with dimensions of for instance at least lxl cm.
• the observing person can further verify the authenticity of the portrait picture 31 by directly viewing the multiple images 32,32' by utilizing a magnifier 35 overlying the multiple images 32,32' and viewing the enlarged array of multiple images 36, as shown in fig. 9.
• the magnifier 35 comprises an optically active layer 38 that compensates for the action of the lenses 4,4'overlying the multiple images 32, 32'so that the array of 36 of images is viewed. In this way an additional authentication of the portrait picture 3 lean be obtained and modification of the enlarged floating image 33 can be detected by observing each individual multiple image 32,32'.

Landscapes

• Physics & Mathematics (AREA)
• Health & Medical Sciences (AREA)
• Electromagnetism (AREA)
• General Health & Medical Sciences (AREA)
• Toxicology (AREA)
• Engineering & Computer Science (AREA)
• Manufacturing & Machinery (AREA)
• Credit Cards Or The Like (AREA)
• Stereoscopic And Panoramic Photography (AREA)
• Lenses (AREA)
• Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
• Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=51660561

Family Applications (1)

Country Status (9)

Families Citing this family (2)

Family Cites Families (7)

• 2014
  • 2014-07-15 NL NL2013193A patent/NL2013193B1/en not_active IP Right Cessation
  • 2014-12-10 EP EP14815090.7A patent/EP3169530A1/de not_active Withdrawn
  • 2014-12-10 WO PCT/NL2014/050846 patent/WO2016010415A1/en active Application Filing
  • 2014-12-10 AU AU2014400881A patent/AU2014400881A1/en not_active Abandoned
  • 2014-12-10 EA EA201790198A patent/EA032936B1/ru not_active IP Right Cessation
  • 2014-12-10 CA CA2955207A patent/CA2955207A1/en not_active Abandoned
• 2017
  • 2017-01-11 ZA ZA2017/00246A patent/ZA201700246B/en unknown
  • 2017-01-12 CL CL2017000084A patent/CL2017000084A1/es unknown
  • 2017-01-13 CO CONC2017/0000318A patent/CO2017000318A2/es unknown

Non-Patent Citations (2)

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