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EP1501688B1 - Image multicouche, en particulier image multicolore - Google Patents

Image multicouche, en particulier image multicolore Download PDF

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Publication number
EP1501688B1
EP1501688B1 EP02740325A EP02740325A EP1501688B1 EP 1501688 B1 EP1501688 B1 EP 1501688B1 EP 02740325 A EP02740325 A EP 02740325A EP 02740325 A EP02740325 A EP 02740325A EP 1501688 B1 EP1501688 B1 EP 1501688B1
Authority
EP
European Patent Office
Prior art keywords
laser
layer
induced
sensitive
image
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
EP02740325A
Other languages
German (de)
English (en)
Other versions
EP1501688B8 (fr
EP1501688A1 (fr
Inventor
Norbert Lutz
Gerhard Zinner
Matthias Schumacher
Ulrich Knaack
Dirk Fischer
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.)
Unica Technology AG
Leonhard Kurz Stiftung and Co KG
Original Assignee
Orga Systems GmbH
Leonhard Kurz GmbH and Co KG
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 Orga Systems GmbH, Leonhard Kurz GmbH and Co KG filed Critical Orga Systems GmbH
Publication of EP1501688A1 publication Critical patent/EP1501688A1/fr
Application granted granted Critical
Publication of EP1501688B1 publication Critical patent/EP1501688B1/fr
Publication of EP1501688B8 publication Critical patent/EP1501688B8/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B42D25/40—Manufacture
    • B42D25/405—Marking
    • B42D25/43—Marking by removal of material
    • B42D25/435—Marking by removal of material using electromagnetic radiation, e.g. laser
    • 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
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • 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
    • B41M5/28—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using thermochromic compounds or layers containing liquid crystals, microcapsules, bleachable dyes or heat- decomposable compounds, e.g. gas- liberating
    • 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
    • B41M5/34—Multicolour thermography
    • 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
    • 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
    • B42D25/333—Watermarks
    • 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
    • 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
    • B42D25/45—Associating two or more layers
    • 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
    • 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
    • Y10S430/00—Radiation imagery chemistry: process, composition, or product thereof
    • Y10S430/145—Infrared
    • 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
    • Y10S430/00—Radiation imagery chemistry: process, composition, or product thereof
    • Y10S430/146—Laser beam
    • 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
    • Y10S430/00—Radiation imagery chemistry: process, composition, or product thereof
    • Y10S430/163—Radiation-chromic compound
    • 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
    • Y10T428/25—Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles

Definitions

  • the invention relates to a multi-layer image, in particular a multicolor image, of a substrate consisting of paper material and a single-layer or multi-layer layer structure applied thereto using a transfer film, preferably a hot stamping film, or a laminating film DE-A-10047450 ).
  • a transfer film preferably a hot stamping film, or a laminating film DE-A-10047450 .
  • the object of the invention is to produce a multilayer image, in particular a multicolor image, on a substrate, preferably consisting of paper material, using a transfer film, preferably a hot stamping film, or a laminating film.
  • the multi-layer image should have high security against counterfeiting. It should also be possible embodiments that are visually particularly interesting, especially in terms of the variety of different colors or different optical effects.
  • the multi-layer image generated in the layer structure is composed of a laser-induced image component and the background layer, wherein the laser-induced image component has multiple colors and / or the laser-induced image component and the background layer are different in color and / or with respect to the optical structure.
  • the laser-induced image component is a region of the laser-sensitive layer which is changed by laser action. This modified region of the laser-sensitive layer thus forms the so-called laser-induced image component. This is arranged so that it overlaps the underlying background layer at least partially, so that the background layer is only partially visible from above and / or more or less translucent visible.
  • the laser-induced image constituent can be formed as a colorless transparent or color-toned transparent or non-transparent marking.
  • Optically particularly interesting and possibly complex images can be obtained in embodiments in which it is provided that adjacent to the laser-induced image component, preferably adjacent to this, in the same laser-sensitive layer another laser-induced image component or a non-laser treated area of the laser-sensitive layer or a not laser-sensitive area is arranged. In this case, this adjacent area may be colorless transparent or tinted in a transparent or non-transparent color.
  • the neighboring areas can have different colors.
  • Each image constituent can be designed as a homogeneous homogeneous laser-induced marking in each case, but can also consist of several different laser-induced markings arranged next to one another.
  • the laser-induced image component is arranged in register with the associated image component formed in or by the background layer.
  • a plurality of laser-induced image components are arranged in register with each other and thus the multi-layer image is composed of these many precisely aligned to each other arranged image components.
  • the laser-induced image component colorless transparent or color tinted transparent is formed and arranged in an underlying layer image component to this in the direction perpendicular to the layer plane in alignment or laterally offset.
  • the underlying layer may be the background layer, which is formed, for example, as a reflection layer with a diffraction structure preferably arranged in a limited area.
  • the laser-induced image component e.g. is designed as a colored marker and / or graphic and / or typeface.
  • a significant advantage of the laser-induced image production is that the laser-induced image component with very high position accuracy and highest resolution can be produced, because the laser beam can be performed exceptionally accurate position and thereby produce markings smallest dimensions.
  • a laser-induced image component can thus be used e.g. also form a microfilm or a guilloche or form a part or in each case the individual sections of these.
  • the laser-sensitive material may be formed as a material which can be changed by the action of the laser via laser-induced fading and / or laser-induced color change and / or laser-induced material removal. This change in the material is carried out by the laser treatment preferably at specific for the material and the respective desired effect laser conditions.
  • the different colors are preferably produced by the action of the laser with different adjustment of the laser, preferably different laser parameters such as laser wavelength and / or laser intensity.
  • the laser-sensitive material may be colorant, preferably a mixture of different colorants. Suitable colorants are pigments. Pigments are preferably insoluble colorants, in particular they are inorganic substances. Alternatively or additionally, other colorants can also be used as the laser-sensitive material, for example soluble organic colorants.
  • the laser-sensitive layer in its material composition has a pigment mixture which is composed of at least three different pigment components, each by means of laser in each case for the pigment component specific laser conditions is bleachable and wherein for each of the three pigment components is that under the laser component for a specific laser conditions, the other pigment components are not or substantially not bleachable.
  • a particularly effective and simple method for producing a full-color image is that the production of the laser-induced image component is effected by bleaching only one pigment component in a first step by laser irradiation of a position of the laser-sensitive layer at laser conditions specific to one of the pigment components that in a second step, by laser irradiation of the same location of the laser-sensitive layer, only that further pigment component is bleached at laser conditions specific to a further one of the pigment components.
  • Laser-induced image constituents in any desired colors can preferably be obtained by the laser-sensitive layer consisting of a pigment mixture, one of the pigment components being a cyan pigment, another pigment component being a magenta pigment, and another pigment component being a yellow pigment. It has proven particularly advantageous if the cyan pigment is formed as a pigment bleachable with red laser light, the magenta pigment as a pigment bleachable with green laser light and the yellow pigment as a pigment bleachable with blue laser light.
  • pigments or other so-called colorants or systems which change their color when irradiated with suitable laser radiation, for example of transparency in a color or from a color 1 in a color.
  • a particularly simple method results when starting from a layer construction in which the background layer has no material which is laser-sensitive in the case of laser action. However, it is also possible to carry out the method with a layer structure in which the background layer also has laser-sensitive material. A particularly simple procedure results when the layer structure has only one laser-sensitive layer and only one non-laser-sensitive layer. Non-laser-sensitive background layer means that no change in the background layer occurs during the laser conditions used during the process.
  • the background layer arranged below the laser-sensitive layer is one of the laser radiation used for producing the laser-induced image constituent and / or for the laser radiation, in particular the non-reflected fraction of the laser radiation is not formed or largely non-transparent and / or absorbent background layer.
  • this background layer can act as a brightener for the laser-induced image component, in particular if the image component is a color marking, ie a colored image component.
  • a largely white background layer is obtained when its reflectance is nearly constant over the visible special area.
  • special pigments in particular white pigments in the Background layer to increase the effect as a brightener or color enhancer yet.
  • the background layer Due to the reflection and non-transparency of the background layer for the non-reflected portion of the laser radiation applied in the laser treatment, damage to or damage to an underlying layer is prevented from occurring in the laser irradiation.
  • the background layer thus acts in this sense as a protective layer for the underlying layer or underlying layers.
  • it may also be absorbent for the non-reflected portion of the laser radiation mentioned.
  • this reflective and / or non-transparent and / or absorbing background layer is arranged exclusively in an area under the laser-induced image component produced in the overlying laser-sensitive layer.
  • Laser-sensitive material may also be arranged in this outermost region of the background layer in order to generate a further laser-induced image constituent there.
  • a plurality of laser-sensitive layers are present in the layer structure. These can advantageously be separated from one another by at least regionally arranged background layers.
  • Particularly interesting optical effects arise when the background layer at least partially has a reflection structure and / or is formed as a reflection layer, preferably as Metal layer, in particular light layer, eg white lacquer layer.
  • the background layer can also have a diffraction structure in regions, for example diffraction gratings, holograms, kinegrams or the like, in particular in or with a metallic layer.
  • the background layer can also have an imprint, at least in regions. Interesting additional effects are obtained if the background layer has different areas over its extension, eg. different colors and / or different structure. In particularly simple to produce embodiments, it is provided that the background layer is uniformly formed over its extension.
  • the laser-induced image component which is formed by laser action on the laser-sensitive layer in a region in which the laser-sensitive layer is transparent in the visible spectral range, can be formed as a positive image in front of the background layer.
  • the laser-induced image component can also be formed by making the laser-sensitive layer completely transparent or partially transparent by laser action on the laser-sensitive layer in a region in which the laser-sensitive layer is formed as an opaque layer, so that the previously from laser-sensitive opaque layer covered background layer is visible in this area.
  • the laser-induced image component can also be formed as a watermark-like component in which the laser-induced image constituent is preferably made partially transparent in front of the background layer by laser action on the laser-sensitive layer in a region in which the laser-sensitive layer is formed as a partially transparent, preferably color-toned layer.
  • the laser can be controlled by detection of design parameters of the background layer, preferably detection of the printing or diffraction image and / or by detection of design parameters of the laser-sensitive layer or the laser-induced image component, in particular by means of image processing. In this case, preferably the position, the direction of incidence of the laser beam, the laser wavelength, the exposure time, the number of pulses and / or the laser intensity can be controlled.
  • the multilayer image is produced in transfer films or hot stamping foils or in laminating films, it is preferably provided that only the laser-sensitive layer is changed during the laser treatment, preferably only by selective bleaching or selective color change.
  • any further layers such as protective layers, for example one or more upper protective layers, remain unchanged, ie no damage to these layers occurs during laser action.
  • the reflection layer is preferably formed so that, with appropriate guidance of the laser beam, it can pass through and act on the laser sensitive layer, which may be arranged underneath.
  • the laser-sensitive layer or the laser-induced marking is arranged in the direction of the multilayer body or on the substrate coated with the film below the diffraction and / or hologram structure and / or the reflection layer, where It is particularly advantageous if the laser-induced marking is arranged directly adjacent to this overlying structure or layer.
  • Sub-reflective layer or reflection field is understood to mean a layer or a region which has increased light reflection and / or increased refractive index. It is a layer or region which may be formed of metal or a metallic compound, e.g. Aluminum, chromium, silver, zinc sulphide, titanium oxide, etc., also a composition of other materials is possible, e.g. Germanium compounds, silicon compounds, etc. It may be a flat, preferably vapor-deposited layer or areas. This layer or areas may be formed contiguous or in separate areas. Embodiments are also possible in which the reflection property is obtained by corresponding particles or the like, e.g. through metallic pigments.
  • hot stamping foils and laminating foils are described, in the layer structure of which multi-layer and multi-color images according to the invention can be produced.
  • the basic process steps of the laser treatment are described, with which the films, i. the laser-sensitive layer is treated to produce the respective multi-layer images.
  • hot stamping foils it is also possible to use other transfer foils, in which case the methods described for producing multilayer and multicolor images are used in a corresponding manner.
  • the foils shown in FIGS. 1 to 5 are hot stamping foils.
  • the hot stamping foil in FIG. 1 comprises a carrier film 1, a release layer 2, a protective layer 3, a laser-sensitive layer 4, a background layer 5 and an adhesive layer 6.
  • the carrier film 1 is preferably a polyester film having a thickness of 6 to 100 ⁇ m, preferably a thickness of 19 to 38 ⁇ m.
  • the layers 2 to 6 are arranged one above the other. They are applied in the production of the hot stamping foil according to known methods.
  • the release layer 2 is a release layer. It is preferably in the form of a layer that becomes soft during heat development and, when the hot stamping film is applied to the substrate, permits the detachment of the further layers from the carrier film 1.
  • the peel layer 2 generally has a thickness of at most 1 ⁇ m.
  • the protective layer 3 is formed as a protective lacquer layer . It is a transparent varnish layer with the task of largely protecting the free surface of the decorated with the hot stamping foil object against mechanical damage and chemical agents.
  • the layer thickness is preferably between 1 and 2 ⁇ m.
  • the laser-sensitive layer 4 is designed as a so-called first colored lacquer layer .
  • This is a paint layer colored by pigments and / or provided with other coloring systems or colorants, preferably 3 to 10 ⁇ m thick.
  • the pigments or the other coloring systems or colorants of this color coat layer are selectively bleachable and / or changed into another color by means of a laser beam whose wavelength is preferably in the visible range.
  • the pigment concentration of this lacquer layer 4 is preferably between 3 and 15% based on solids.
  • the binder system of this lacquer layer 4 may not be optically changed by the action of the laser, so that the irradiated areas only a colored contrast mark without recognizable damage to the surface structure is formed.
  • the laser-sensitive layer 4 has only one bleachable pigment or only one bleachable other colorant, this pigment or colorant is present as the only pigment or colorant or in addition to other pigments or colorants. Even with such designs, a colored marking can be generated by laser irradiation.
  • a pigment or colorant is used, which has laser-selective color change in laser treatment.
  • the background layer 5 is formed as a so-called second color coat layer. This layer is colored differently than the laser-sensitive layer 4.
  • the layer 5 is, for example, white or ivory when the laser-sensitive layer 4 is black or gray.
  • the layer 5 serves primarily as a light backup layer for the colors generated in the laser-sensitive layer 4 by laser radiation.
  • the layer thickness of the layer 5 is preferably 15 to 20 microns.
  • the background layer 5 - as well as the laser-sensitive layer 4 - not over the entire surface of the hot stamping foil and thus not over the entire surface to be decorated in the same color position.
  • the layers 4 and 5 can rather individually - and thus also different - be composed of different colored areas.
  • the adhesive layer 6 is a conventional and known adhesive layer of transfer foils or hot stamping foils and has a thickness of approximately 1 to 10 .mu.m, the adhesive layer for a hot stamping foil being such is composed that it is sticky only with appropriate heat.
  • hot stamping foils in this case - are each preferably applied in a conventional manner to a substrate, in such a way that the adhesive layer 6 faces the substrate surface.
  • the adhesive layer 6 then forms an adhesive bond with the substrate surface during hot stamping.
  • the carrier film 1 is then - after the heat under action during hot stamping softening of the release layer 2 - deducted.
  • the protective layer 3 then forms the upper surface of the stamping foil facing away from the substrate.
  • the hot stamping foils illustrated in FIGS. 2 to 4 have a background layer of a different design than the foil in FIG. 1.
  • the background layer is formed as a reflection layer 5r.
  • the reflection layer is designed as a metallic reflection layer.
  • the reflection layer can be transparent or partially transparent for certain spectral ranges. It can have a higher refractive index than the other layers and therefore exhibits increased light reflection on.
  • a layer 5c is provided as an additional lacquer layer, which is preferably transparent.
  • a reflection layer 5r is provided, which has a diffraction structure 5b in regions.
  • FIG. 1 the exemplary embodiment in FIG.
  • this structure 5b is formed as a component of the lacquer layer 5c and of the adhesive layer 6 and of the layer lying therebetween.
  • a diffraction structure may also be formed as a constituent of the lacquer layer 5c or the color lacquer layer 4.
  • the diffraction structure may also be formed in regions in this case as a continuous layer.
  • a printed image 5d is arranged in the background layer 5c in a limited area and a limited laser-sensitive area 4a is arranged laterally offset in the laser-sensitive layer.
  • FIG. 5 shows a hot stamping foil with a modified layer structure.
  • the layer structure is similar to that in Figure 3, but the. Order of the layers is modified, in such a way that the laser-sensitive layer 4 is disposed on the side facing away from the substrate of the reflective layer 5r.
  • the layers are in the following order: support layer 1, release layer 2, protective layer 3, laser-sensitive layer 4, reflection layer 5r, laser-sensitive layer 4, additional lacquer layer 7 and adhesive layer 6.
  • the laser-sensitive layers 4 formed on both sides of the reflection layer 5r can be formed identically, that is, the reflection layer is then arranged in this laser-sensitive overall layer.
  • the laser-sensitive layers can also be designed differently.
  • a diffraction structure 5b is formed in adjacent areas of the laser-sensitive layers 4 and of the reflection layer 5r.
  • the structure 5b may also be formed as a hologram structure. Increased security against forgery results in this embodiment in that two laser-sensitive layers adjoin the diffraction or hologram structure, which may be identical or different.
  • the lacquer layer 7, which is optional, is in this case designed as a transparent layer or as a light backup layer.
  • the lacquer layer 7 and the adhesive layer 6 can be dispensed with and the second laser-sensitive layer 4 shown in FIG. 5 a below the reflection layer 5 r can be formed as a laser-sensitive adhesive layer.
  • the layers are arranged in the following order: carrier film 1, release layer 2, laser-sensitive layer 4, additional lacquer layer 5c, reflection layer 5r, adhesive layer 6.
  • the layers 5c and 6 can be formed of identical material or different material.
  • this exemplary embodiment is a protective lacquer layer which is laser-sensitive in that it contains the relevant comparable pigments.
  • a diffraction structure is formed in the adjoining areas of additional paint layer 5c, reflective layer 5r and adhesive layer 6, a diffraction structure is formed. It can be designed as a diffraction grating.
  • the structure 5b may also be formed as a hologram structure.
  • the laser treatment is carried out in order to produce transparent and / or colored markings in the laser-sensitive layer 4.
  • this point is irradiated with laser radiation.
  • the laser irradiation takes place through the reflection layer 5r including the diffractive structure 5b.
  • the laser beam is preferably directed perpendicular to the film plane from above.
  • the reflection layer 5r is permeable to the laser radiation, in particular in the case of perpendicular irradiation.
  • the lattice or hologram structure 5b of the layer forming the reflection layer 5r in the remaining area is also permeable to the laser radiation, but the radiation is also more or less also diffracted at the diffraction structure or z. can be reflected.
  • the laser-sensitive layer 4 which is formed under the layer forming the reflection layer 5r in the remaining area still within the diffraction structure 5b and below is changed by the action of the laser by a color change by bleaching at the specific location.
  • a blue or green or red color mark is produced by irradiating that spot with a particular laser wavelength that bleaches a particular pigment component.
  • a particular laser wavelength that bleaches a particular pigment component.
  • the yellow pigment component must be bleached.
  • blue laser light is used. Bleaching requires a certain minimum intensity. Furthermore, a certain pulse duration must not be exceeded.
  • the magenta pigment component In order to obtain a green color mark in the first step, the magenta pigment component must be bleached. For this purpose, green laser light is used. In order to get a red color mark in the first step, the Cyan pigment component bleached. For this purpose, red laser light is used.
  • this point is laser-treated in a second step, with a laser wavelength with which one of the not yet bleached at this point pigment component is bleached.
  • a blue color mark has been formed in the first step, at this point the cyan pigment component and the magenta pigment component are unbleached.
  • the magenta pigment component must be bleached in this second step. This is done with green laser light. This results in a cyan mark at this point.
  • magenta mark is to be obtained instead of this cyan mark
  • the blue mark produced in the first step must be treated with red laser light.
  • the cyan pigment is bleached at this point, so that the magenta pigment remains unbleached at this point. This results in the magenta marking at this point.
  • a green color marking produced in the first step which is formed from unbleached cyan pigment and yellow pigment remaining there, can produce a cyan-colored marking or a yellow-colored marking by treatment with blue laser light or red laser light.
  • a red generated in the first step Color mark in the second step are converted into a yellow or magenta mark, by laser treatment in the second step with green laser light or blue laser light.
  • this spot must be treated with a laser beam whose wavelength is adjusted to bleach the unbleached pigment component remaining at that point after the second step, i. the yellow color mark must be bleached with blue laser light, the magenta mark with green light and the cyan mark with red laser light.
  • Laser treatment can also be used to produce color markers or a full-color image in the colorant or the colorants in the laser-sensitive layer by color change.
  • the laser treatment can be carried out in a corresponding manner with successive process steps.
  • colorants ie coloring substances are pigments in question. These are usually insoluble and are usually inorganic substances.
  • the color change takes place in each case under specific laser conditions, which are then used in the laser treatment in the individual steps.
  • the described bleaching and color conversion process can also be used if the laser-sensitive material consists of only one or two of the colorant components. It is also possible to use other colorant components and also other laser conditions, in particular laser wavelength ranges, in the laser treatment.
  • the laser treatment of the transfer or embossing foil for producing the color markings can also take place before the application of the foil, in particular if the protective layer 3 is formed as a layer which is not transparent to laser radiation or a layer which is not transparent for laser radiation in the specific wavelength range or an additional UV-absorbing protective layer is provided.
  • the laser treatment is then performed prior to application of the film by exposing the laser beam to the back of the film, i. is directed to the background layer 5 and thus the laser-sensitive layer 4 is thus treated from the other side to produce the color markings therein in the same way.
  • the background layer 5 and the adhesive layer 6 are transparent or at least partially transparent for the laser radiation in question in these applications.
  • the laminating film in Figure 6 comprises a so-called overlay film 30, an optional intermediate layer 31, a laser sensitive layer 40, a background layer forming intermediate layer 50, which is also optional, and an adhesive layer 60.
  • the laminating film with the adhesive layer 60 becomes the substrate surface facing the substrate applied.
  • an adhesive bond with the substrate surface is formed.
  • the overlay film 30 then forms the upper protective layer whose surface facing away from the substrate forms the outer surface of the film.
  • the overlay film 30 therefore remains deposited there after the application of the laminating film. It corresponds to the protective layer 3 of the embossing foil in FIG. 1.
  • the laser-sensitive layer 40 corresponds to the laser-sensitive layer 4, ie the first lacquer layer 4 of the embossing foil in FIG. 1.
  • the intermediate layer 50 corresponds to the background layer 5, ie the second lacquer layer 5 of the embossing foil in FIG 1.
  • the adhesive layer 60 corresponds to the adhesive layer 6 of the stamping foil in FIG. 1.
  • the laminating foils in FIGS. 7 and 8 represent modifications of the laminating foil in FIG. 6, in which the background layer corresponds in a similar manner to the background layer in the hot stamping foils in FIGS 3 are modified.
  • the laminating film in FIG. 9 has a layer structure with a sequence of superimposed layers which has been modified with respect to FIGS. 6 to 8.
  • the order of the layers corresponds to the structure of the hot stamping foil in FIG. 5.
  • the layer 70 is an optional background layer.
  • FIG. 9a shows an embodiment modified from the exemplary embodiment in FIG. 9 with an order of the layers corresponding to the structure of the hot stamping foil in FIG. 5a.
  • the laminating film in FIG. 10 represents a modification of the laminating film in FIG. 9.
  • the overlay film 30 is provided with a hot embossing film applied thereon.
  • This hot stamping film applied there replaces the layers 31, 50 or 50r, 40, 70 and 60 provided in the laminating film in FIG. 9 with the corresponding layers the hot stamping foil.
  • the reflective layer 5r and the laser-sensitive layer 4 are arranged in the reverse order, so that in the laminating foil in FIG. 10, as in the case of the laminating foil of FIG. 9, the reflective layer 5r is arranged on the side facing away from the substrate side of the laser-sensitive layer 4.
  • the diffraction structure 5b in the laminating film in FIG. 10 is also formed in the adjoining regions of the layers 4 and 5.
  • the lacquer layer 5 is formed here as a transparent layer.
  • the laminating film in FIG. 10a has a similar structure to the laminating film in FIG. 10.
  • the overlay film 30 is provided with a hot stamping foil applied thereon, which has a similar construction to the hot stamping foil of the exemplary embodiment in FIG. 5a.
  • This hot stamping foil applied to the overlay foil 30 replaces the layers 31, 40, 50, 50r, 40, 70 and 60 provided in the laminating foil in FIG. 9a with the corresponding layers of the hot stamping foil.
  • the laminating film in FIG. 10a has a layer sequence in the following sequence: overlay film 30, adhesive layer 6, optional lacquer layer 5, laser-sensitive layer 4, reflection layer 5r, laser-sensitive layer 4, additional lacquer layer 5c and protective layer 3.
  • the laser-sensitive layers 4 formed on both sides of the reflection layer 5r may be identical, ie, the reflection layer 5r is then arranged in this laser-sensitive overall layer. However, the laser-sensitive layers 4 can also be designed differently.
  • the lacquer layer 5 is formed here as a transparent layer or as a light backup layer.
  • the laminating film in FIG. 10b represents an exemplary embodiment in which a hot embossing film is likewise applied to the overlay film 30.
  • This applied hot stamping foil is of similar design as the foil in FIG. 5. It replaces the layers 31, 40, 50 or 50r, 40, 70 and 60 provided in the laminating foil in FIG. 9a by the layers of the hot stamping foil.
  • the laminating film in FIG. 10b has a layer sequence with the following sequence: overlay film 30, adhesive layer 6, optional lacquer layer 7, laser-sensitive layer 4, reflection layer 5r, additional lacquer layer 5c and protective layer 3.
  • the laser treatment of the laminating film is carried out in a similar manner as described for the stamping foil, i. by corresponding successive bleaching or laser-sensitive color change of the colorant contained in the laser-sensitive layer 40, i. Pigment components or other laser-sensitive colorants.
  • FIGS. 11 to 30 exemplary embodiments of multilayer images which are shown in FIGS. 11 to 30 and which are produced by using the various films as shown in FIGS. 1 to 10 can be produced by the described laser treatment.
  • the illustrated multilayer images are each composed of a laser-induced image component produced in the laser-sensitive layer and an image component formed by the background layer or above the foreground layer.
  • FIGS. 11 to 30, which show the various exemplary embodiments of the multilayer images produced show, as far as they contain sectional views, the laser-sensitive layer 4 in an upper or lower film layer and the background layer 5 arranged underneath or above in a lower or upper one Film layer.
  • only one laser-sensitive layer 4 of the upper or lower film layer and only one background layer 5 of the lower or upper film layer are shown. Any further layers of these film layers and any interposed layers and overlying and underlying layers and any other layers of film are not shown for simplicity.
  • the reflection layer is preferably arranged directly on or under the laser-sensitive layer.
  • a film is assumed in which the laser-sensitive material is present in a film layer in the layer 4 in a limited region 4a.
  • the area 4a in FIGS. 8a, b, which show the state before the laser treatment, is a rectangular area in the plan view.
  • the laser-sensitive material can also be formed over the entire surface over a larger area of the film layer.
  • the background layer 5 has in the illustrated embodiment a printed image 5d, which is arranged in a film layer below the laser-sensitive region 4a.
  • the laser-sensitive region 4a covers the printed image 5d.
  • the laser-sensitive layer is formed as a completely or more or less completely optically covering layer, so that the printed image 5d arranged underneath is not visible from above or is only more or less translucent before the laser treatment.
  • the laser-sensitive material is preferably black or gray or has a particular dark, at least more or less opaque color.
  • the underlying print image 5d is freely visible in the region of the marking or more or less translucent visible. In this way, therefore, a mark is obtained which - depending on the color or the design of the printing 5d and depending on the degree of transparency or tinting of the marking area in the layer 4a - can have any color or colorful design.
  • an image results which is combined from a laser-induced image component and an image component formed by the background layer.
  • the laser-induced image constituent in the illustrated exemplary embodiment in FIG. 8 is a negative image consisting of a region 10 which is more or less transparent due to the laser treatment and a non-laser-treated opaque region of the laser-sensitive layer 4a arranged around it.
  • the other image component is formed by the area of the background layer exposed by the change of the laser-sensitive layer, ie the exposed area of the printed image 5d.
  • the exemplary embodiment in FIG. 12 is a correspondingly produced image.
  • the only difference with respect to the exemplary embodiment in FIGS. 11 a to d is that in FIG. 12 the printed image 5 d formed in the background layer has a color progression and thus the marking with color gradient becomes visible through the laser-treated region.
  • the third embodiment which is shown in Figures 13a to 13d, is made and constructed in a similar manner as the embodiments shown in Figures 11 and 12.
  • the background layer has a diffraction pattern 5 b instead of a printed image 5 d.
  • the diffraction pattern 5b may be formed in a metal layer having a corresponding surface structure and / or formed in a lacquer layer and deposited with a metal layer.
  • the exemplary embodiment of FIGS. 13a to 13d has a particularly interesting optical effect due to the diffraction pattern 13b visible in the region of the marking 10.
  • the laser-sensitive region 4a and the diffraction pattern 5b may be laterally offset from one another, ie not aligned one above the other, as in the embodiment in Figures 13a to 13d.
  • Such an embodiment is shown in Figures 14a to 14d.
  • the background layer 5c or 50 has a diffraction pattern in a limited area 5b and is formed as a reflective layer in the entire area or has a reflective layer.
  • the region with the diffraction pattern 5b is not aligned below the laser-sensitive region 4a, but laterally offset when viewed perpendicular to the film plane.
  • the reflection layer has no diffraction pattern 5 b, but rather an area that is metallically dull or metallically shiny.
  • various marks 10 are made by the laser by laser-induced bleaching or laser-induced color change.
  • the respective laser-treated regions 10 thereby become more or less transparent. Due to the laterally offset arrangement of the diffraction structure, depending on the viewing angle, different effects, in particular different ones, can be achieved Color designs can be obtained in the area of the markings 10. It is thus possible to generate special codes.
  • laser markings 10 can be easily formed in any desired shape by appropriate guidance of the laser beam in the laser treatment. Letters, i. Lettering in any configuration and size, e.g. also certain individual lettering are generated.
  • the markings can also be designed as any graphic shapes. By using different laser conditions in different areas of the marking markings can be produced with different degrees of bleaching or multi-colored markings at different places.
  • exemplary embodiments according to FIGS. 11 to 14 are possible as a lottery foil, for example by printing the gain sum in the film production in the background layer 5 and, by way of that, applying the film layer with the laser-sensitive layer.
  • the prize sum can also be printed on the substrate to which the film is applied.
  • the laser-sensitive layer can then be bleached and thus the profit can be made visible.
  • FIGS. 15a to 15d a layer structure is assumed in FIGS. 15a and b which also corresponds to the layer structure in the exemplary embodiment of FIGS. 12 to 14 described above.
  • an outer area surrounding the marking laser-treated. Bleaching or color change makes the area transparent or partially transparent.
  • the resulting image is composed of an untreated remaining area 10r remaining in the laser-sensitive layer 10 (formed as letter A in Figs. 15c and d) and one due to bleaching of the rest laser-sensitive area 10 transparent external area, through which the print image 5d is visible, together.
  • the marking is produced in a similar manner as described for the exemplary embodiment of FIGS. 15 to 15d.
  • the laser-sensitive layer 4a is formed, for example, as a green covering layer. Selective bleaching at different laser wavelengths produces different colored marks 10x, 10y, 10z.
  • the green laser-sensitive layer is changed to blue by irradiation with laser light in the blue spectral range, and to yellow by irradiation with laser light with a red spectral range.
  • By successive or simultaneous application of both wavelengths of the outer region 10 is completely bleached, that is formed as a transparent area.
  • the generated image is a name train consisting of a name component 10x and a name component 10y, underlined by a line structure 10z.
  • the first word “Peter” can be generated with the method described above as a blue lettering and the second word, here "Müller", as a yellow lettering and the line structure as green lines.
  • the area around these markings around area 10 is completely bleached, so that in this area arranged in the background layer diffraction pattern 5 b or optionally a pressure or the like. appears visible.
  • the exemplary embodiment in FIGS. 17a to 17d is modified relative to the exemplary embodiment in FIGS. 16a to 16d in that the laser-sensitive layer 4 is arranged on the side of the diffraction structure 5b facing the substrate and thus the diffraction structure overlaps the laser-induced marking 10.
  • the laser-sensitive layer with the laser-induced marking formed therein is directly adjacent to the diffraction structure 5b or is part of the diffraction structure itself.
  • FIGS. 18a to 18d a film is assumed in FIGS. 18a and 18b in which the laser-sensitive layer 4a is translucent green.
  • the watermark-like image shown in Figures 18c and d can be generated. It consists of a translucent colored line structure, namely a translucent blue line 10x and a translucent yellow line 10y.
  • the relevant line is formed by an individualized micro-font 10xs, 10ys.
  • the line 10x can therefore be formed by a blue micro-font and the line 10y by a yellow micro-font.
  • the translucent blue line 10x composed of written in the microform, lined up in line line name "Peter Müller” and the translucent yellow line 10y from in microwriting in the line lined up date "20.4.2000" - or any other personal data - insist.
  • the area of the laser-sensitive layer 4a in the region outside the lines 10a and 10b is completely bleached laser-induced in the exemplary embodiment, but can also be made to stand out from the line structure by tinting through corresponding specific laser treatment in another color.
  • a laser-sensitive layer is assumed which is tinted transparent in color, e.g. green transparent.
  • a lettering is produced by laser-induced color change.
  • the lettering consists of a blue and a yellow component.
  • FIGS. 20a to 20d is modified relative to the exemplary embodiment in FIGS. 18a to 18d in that the laser-sensitive layer 4 is arranged on the side of the diffraction structure 5b facing the substrate and the diffraction structure covers the laser-induced marking 10x, 10y. Moreover, this embodiment corresponds to the embodiment in Figures 18a to 18d in Figures 20a to 20d.
  • a film is assumed in which the laser-sensitive layer 4 a is formed to be more or less opaque green or in another color in the region 4 a.
  • the background layer 5 has in the area below a reflection layer with separate individual regions with diffraction pattern 5b.
  • separate markings in the form of alternating, spaced-apart square fields 10x and 10y are formed with exact position in the laser-sensitive layer 4a.
  • the fields 10x blue, preferably cyan, and the fields 10y are formed yellow.
  • the area around the fields 10x, 10y is not laser-treated and remains in the original color, ie, for example, green.
  • the fields 10x, 10y are more or less transparent, so that, due to the diffraction of light at the diffractive structures 5b, a color play arises, depending on the optionally superimposed colors and the wavelength-dependent reflection of the incident light.
  • the background layer 5 has alternating diffractive surfaces 5b and metallically specularly appearing areas which fit exactly to the laser-induced fields 10x, 10y, varying image impressions result in connection with the surfaces colored by the laser irradiation as a function of the illumination and viewing angle ,
  • the metal layer is formed only in separate separate areas 5r as a reflection layer and the entire remaining area is formed as a lattice structure.
  • the laser-sensitive layer can be irradiated by laser action so that alternating fields 10x, 10y are bleached differently, i. different color can be obtained.
  • These laser-induced color markings forming fields 10x, 10y can be arranged so that they are arranged in the direction perpendicular to the layer plane aligned above the reflection fields 5r. Depending on the illumination and viewing angle, varying optical effects result.
  • round fields 10x, 10y are configured in different order in the laser-sensitive layer 4 by laser-sensitive bleaching in alternating sequence. They are positionally accurate - viewed in the direction perpendicular to the layer plane - arranged in alignment over diffractive fields 5b, which also have a plan view in a round outline.
  • the Diffractive fields are formed in a reflective layer, which are arranged below the laser-sensitive layer 4, preferably immediately below.
  • the exemplary embodiment in FIGS. 23a to 23d is modified relative to the exemplary embodiment in FIGS. 22a to 22d in that round reflection fields 5r are arranged in the diffraction structure 5b and the laser-induced likewise round color fields 10x, 10y are arranged in exact position over the reflection fields 5r.
  • a film is assumed in which the partially transparent reflection layer 5 is arranged above the laser-sensitive layer 4.
  • the laser sensitive layer 4 is more or less opaque, e.g. green or in a different color in the area 4a.
  • the reflection layer 5 has regions of a diffraction structure 5b, wherein in separate individual fields 5r, the reflection layer 5 is formed as a flat layer without diffraction structure.
  • the reflection layer 5 is deposited vapor-deposited directly on the laser-sensitive layer 4.
  • the diffraction structure 5b is formed in the reflection layer and the laser-sensitive layer 4 and extends into the laser-sensitive layer 4.
  • 26a to 26b is modified relative to the exemplary embodiment in FIGS. 24a to 24d such that diffraction fields 5b are formed in the reflection layer 5r arranged above the laser-sensitive layer 4 and the laser-induced fields 10x, 10y are formed precisely under the diffraction fields 5d , wherein the mutually associated diffraction fields 5b and laser-induced fields 10x, 10y each have the same rectangular base area.
  • the laser-sensitive material in the layer 4 in a limited area, rectangular in outline Arranged area.
  • the layer 4 is transparent outside the region 4a, so that the printed image 5d formed in this region in the background layer is visible.
  • the printed image 5d can be formed in a separate background layer of the multilayer film or else directly on the substrate surface.
  • the print image 5d is the word image "Bank of Iceland” and the phrase "passport number". The latter is between two parallel also printed or only fictitious, ie only imaginary lines of flight 5 df accurately arranged.
  • the massless laser beam By positionally accurate guidance of the massless laser beam, it is possible to continue the labeling with accuracy in the micrometer range with respect to the printed image 5d in the laser-sensitive region 4a by selective bleaching or selective color change. Therefore, a marking is generated which the two alignment lines 5df of the printed image, which are arranged on both sides of the laser-sensitive field 4a, or even exist only fictitiously as imaginary alignment lines, continue in the field 4a as laser-induced alignment lines 10f. Between the lines 10f, a corresponding laser-induced inscription 10x, 10y in the illustrated exemplary embodiment generates the numerical sequence "5 7 6 4 9 3 7".
  • the individual digits 10x, 10y may be formed in different colors and each have a color gradient, e.g. by different bleaching or different color change in different areas of the figures or by appropriate design of the underlying possibly translucent printed image.
  • the individual digits 10x, 10y can also be formed in micro-writing. In this way, a high security against counterfeiting is obtained.
  • the embodiment in FIG. 28 is a modification compared to the exemplary embodiment in FIG. 27, wherein a diffraction structure 5b is arranged above the laser-sensitive layer 4a in order to increase the security against counterfeiting.
  • This can be embodied directly on the laser-sensitive layer, for example in a reflection layer which is vapor-deposited there in this limited area or in a reflection layer which covers the entire surface of the exemplary embodiment shown in FIG.
  • this reflection layer is designed as a diffraction structure only in the region which overlaps the laser-sensitive field 4 a, which is likewise transparent.
  • the laser treatment is carried out by laser irradiation through the reflection layer or the diffraction structure 5b.
  • the laser-induced markings are generated in register.
  • the fact that the diffraction structure is arranged above the laser-induced marking in the exemplary embodiment in FIG. 28 and that it is connected directly to the relevant layer which has the markings results in increased security against forgery.
  • a register-accurate assignment of diffractive fields to laser-induced color areas is likewise realized, this embodiment having a full-color portrait image produced in a laser-induced manner as a laser-induced image 10y.
  • the laser-induced image is formed in a laser-sensitive layer 4.
  • diffraction elements 5b are provided, which are formed as guilloches and are complemented by 10x accurate register by each subsequent laser-induced colored guilloches.
  • Such a structure consisting of successive arcuate regions alternating as diffraction guilloules 5b and laser-induced colored guilloches 10x are formed is arranged in the manner of a closed circle around the laser-induced portrait image 10y.
  • serpentine diffraction guilloches 5b are additionally formed, which overlap the laser-induced image 10y in sections.
  • the layer structure of the embodiment in FIGS. 29a and b is similar to the embodiment in FIG. 28.
  • the diffraction structure elements 5b are arranged above the laser-sensitive layer in which the laser-induced image 10y and the laser-induced guilloches 10x are arranged. These are preferably arranged in a layer forming the reflection layer 5r in the remaining area, but may also be formed exclusively and directly in the laser-sensitive layer 4a.
  • the laser treatment for producing the laser-induced full-color image 10y and the colored guilloches 10x takes place in a corresponding manner as in the previously described exemplary embodiments.
  • the exemplary embodiment illustrated in FIG. 30 is an embodiment modified from the exemplary embodiment in FIG. 29. It also has a laser-induced portrait image 10y, which is designed as a full-color image. Instead of the laser-induced and diffraction Guillochen however star-shaped diffraction elements 5b at the four edges of the laser-induced portrait image 10y arranged in the embodiment in Figure 30 so that they with one half each have an edge region of the laser-induced color image 10y and with another half the overlap the laser-induced image 10y surrounding area, thus in the manner of a conventional security stamp or seal.
  • the layer structure of the embodiment in FIG. 30 may be be designed accordingly as that of the embodiment in Figures 29a and 29b.
  • the layer structure can be formed by a film, preferably a transfer film, applied to the substrate, the laser-sensitive layer with the laser-induced portrait image 10y formed therein being arranged on the side facing the substrate, and the diffraction elements 5b on the side of the laser-sensitive layer facing away from the substrate and thus the laser-induced image 10y is arranged across and covering.
  • the exemplary embodiments in FIGS. 29 and 30 may be personalized identity cards.
  • the name "Tamara test woman” is likewise applied as a laser-induced marking, preferably multicolored, as a signature under the laser-induced portrait image 10y.
  • the lettering can be designed to increase the security against counterfeiting in micro-writing.
  • FIGS. 31a and 31b is an embodiment compared to the embodiments of FIGS. 29 and 30 modified.
  • This embodiment consists of a carrier forming the substrate, which is formed of paper material on which a hot stamping foil is applied, which can be seen from the sectional view in Fig. 31b, consists only of a laser-sensitive layer 4 and an upper protective layer 3 and a Adhesive layer 6, which represents the connection to the substrate surface.
  • the laser-sensitive layer 4 is formed as a laser-induced image, a same as in Figures 29 and 30 formed full-color image.
  • no background layer 5 is provided in the layer structure of the hot stamping foil.
  • the background layer is formed on the surface of the substrate 8 as a separate coating 315 or as an integral part of the substrate 8.
  • a security imprint 315d which may be formed eg guilloches or the like and fluorescent threads 316, which can fluoresce, for example under UV light and are not visible in daylight or only appear as black threads.
  • 8 watermarks 315w are formed in the carrier preferably made of paper material.
  • a security strip 310 is disposed in the carrier 8, which passes through the laser-induced image 10y and also extends beyond in the region in which the laser-induced image component 10y is not formed.
  • the laser-induced image 10y is rectangular in plan in the illustrated embodiment and only in a partial region of the surface of the carrier 8 is arranged.
  • the transfer film having the laser-sensitive layer 4 is preferably also formed only in this limited area.
  • the rectangular image area of the laser-induced image 10y is transparent, ie the area of the laser-sensitive layer is bleached by the laser treatment in such a way that the colored image components are rendered tinted transparent and the area around the color marks completely transparent is. This results in the advantage that the marking 315 present on the substrate appears visible through the laser-induced image 10y. In this way, particularly high counterfeit security is obtained.
  • the exemplary embodiment illustrated in FIG. 32 is a modification of the exemplary embodiment in FIGS. 31 a, b.
  • a background layer 5 is formed in FIG. 32 in the region of the laser-induced image 10y.
  • This background layer 5 is part of the transfer film.
  • the background layer 5 is formed on the side of the film facing the carrier 8 and is thus arranged between the laser-sensitive layer or the laser-induced image component and the substrate surface when the film is applied to the substrate.
  • the background layer 5 covers in this area the label elements arranged on and in the substrate.
  • the advantage of the background layer 5 is that the laser-induced image is very clearly recognizable and in the laser-induced image formation no damage of the substrate or underlying layers can occur.
  • the background layer 5 is reflective for the laser radiation acting in the image formation and largely impermeable and absorbing for the non-reflected part of the laser radiation. As a result, in the laser irradiation to produce the laser-induced image 10y damage or otherwise unwanted laser-induced changes in the substrate and the substrate is prevented. Due to the reflection of the background layer 5 and preferably by the addition of special brightener substances, the color effect of the laser-induced image components is enhanced and the color is preferably brightened.
  • Fig. 33 is a modification of the embodiments in Figures 31 and 32.
  • the background layer 5 is formed only in the left half of the laser-induced color image 10y, so that only in this left subregion in which the background layer 5 is formed, the marking 315 is covered on the substrate 8 and not visible.
  • no background layer 5 is arranged, so that in this area through the color-toned transparent laser-induced color image through the surface of Substrate and thus the marking 315 is visible.
  • This exemplary embodiment results in particularly increased protection against counterfeiting, since the laser-induced image 10y interacts in a particularly versatile manner with the other identification elements optically.
  • the laser-sensitive layer 4 can also be designed as a layer which is merely blackenable under laser light, for example as a layer doped with carbon or carbon black. It can be carbonized under the action of laser radiation, in particular Nd: YAG laser radiation of the wavelength 1064 nm. It is thus a grayscale image possible if the laser condition, preferably the laser power is varied according to the irradiation.
  • a card structure is shown in an exploded view. It is a body laminated on various overlay foils 30, 32 and inlets 90.
  • the inlets 90 may preferably be made of paper material, but also of plastic material.
  • On the upper inlet 90 a carbon or carbon black-doped overlay film 32 is arranged, on which an overlay film 30 is applied.
  • This overlay film 30 corresponds in structure to the laminating film, as shown in Fig. 10. It has a carrier film 30, on the underside of which a transfer film, preferably a hot stamping film, is applied, which has an intermediate layer 5c and a reflection layer 5r and a laser-sensitive layer 4.
  • a diffraction and / or hologram structure 5b is formed in the reflection layer 5r and in the laser-sensitive layer 4, a diffraction and / or hologram structure 5b is formed.
  • an additional background layer 5 may be formed between the laser-sensitive layer 4 and the doped overlay film 32 as a separate overlay film or as a lower further layer of the laminating film 30.
  • the doped overlay film 32 and the inlet 90 may have such a background layer 5 as a separate overlay film or as a layer of the doped overlay film 32 or the inlet 90.
  • background layers 5 may be designed such that they reflect the laser radiation acting in the overlying layer during the laser-induced image formation and / or absorb the non-reflected portion or in any case do not pass into the underlying layer. It can also be provided that the background layer 5 is arranged only in the subarea by generating a laser-induced image component in the overlying laser-sensitive layer.
  • the laser-sensitive material in the laser-sensitive layer 4 may contain coloring agents which cause bleaching or color change in the laser action in the manner described in the foregoing embodiments, so that the laser-induced image in this layer 4 is a color image can be trained.
  • the carbon or carbon black doped overlay films 32 with appropriate laser treatment, e.g. With Nd: YAG laser radiation of wavelength 1064 nm, a grayscale image can be generated as a laser-induced image.

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Claims (25)

  1. Image multicouche, en particulier image multicolore, d'un substrat se composant de préférence de matériau papier et d'une structure monocouche ou multicouche disposée dessus en utilisant une feuille de transfert, en particulier une feuille estampée à chaud, ou une feuille laminée, la structure de couches présentant une couche (4,40) - ci-après désignée par couche sensible au laser - présentant un matériau sensible au laser, laquelle couche est modifiée au moins partiellement sous l'effet du laser en formant au moins un élément d'image (10) produit par un laser et l'image multicouche ou au moins une partie de l'image multicouche est formée par l'élément d'image (10) produit par le laser et par une couche d'arrière-plan (5, 50) et/ou une couche de premier plan, tandis que l'élément d'image (10) produit par le laser est disposé de manière à recouvrir au moins partiellement la couche d'arrière-plan ou de manière à être recouvert au moins partiellement par la couche de premier plan de sorte que la couche d'arrière-plan (5, 50) ou l'élément d'image (10) produit par le laser soit visible de dessus uniquement partiellement et/ou plus ou moins en transparence,
    caractérisée en ce que le matériau sensible au laser est conçu comme un mélange de différents composants sensibles au laser, le mélange étant composé de deux, de préférence de trois colorants différents, de préférence de pigments, chacun de ces deux ou trois composants, de préférence chaque composant du mélange, pouvant être décoloré au moyen du laser dans des conditions relatives au laser spécifiques à chaque composant, et/ou le mélange étant composé de deux, de préférence de trois différents composants chromogènes, de préférence des colorants chromogènes, la couleur de chacun de ces composants, de préférence de chaque composant du mélange pouvant être altérée au moyen du laser dans des conditions relatives au laser spécifiques à chaque composant.
  2. Image multicouche selon la revendication 1, caractérisée en ce que la couche d'arrière-plan est conçue de préférence comme un élément du substrat, tandis que la surface du substrat est formée comme une couche d'arrière-plan.
  3. Image multicouche selon la revendication 1 ou 2, caractérisée en ce que plusieurs couches sensibles au laser se composant de préférence d'un matériau sensible au laser différent sont disposées les unes sur les autres.
  4. Image multicouche selon la revendication 3, caractérisée en ce qu'entre les couches sensibles au laser disposées les unes sur les autres est disposée une couche d'arrière-plan formant une couche intermédiaire.
  5. Image multicouche selon l'une quelconque des revendications précédentes, caractérisée en ce que la couche d'arrière-plan est disposée sous la couche sensible au laser, de préférence exclusivement dans la zone sous l'élément d'image produit par le laser.
  6. Image multicouche selon l'une quelconque des revendications précédentes, caractérisée en ce que la couche d'arrière-plan est conçue comme une couche d'arrière-plan non ou à quelques détails près non transparente et/ou absorbante de la part réfléchie du rayonnement laser et/ou réfléchissant pour la génération d'un élément d'image produit par le laser.
  7. Image multicouche selon l'une quelconque des revendications précédentes, caractérisée en ce que la couche d'arrière-plan est transparente à la lumière dans le domaine spectral visible et/ou est conçue de manière transparente ou non transparente au rayonnement laser uniquement dans certaines conditions relatives au laser, notamment uniquement dans certaines gammes d'onde, est conçue de préférence de manière transparente ou non transparente au rayonnement laser qui est utilisé pour la génération d'un élément d'image produit par le laser.
  8. Image multicouche selon l'une quelconque des revendications précédentes, caractérisée en ce que l'élément d'image (10) produit par le laser présente des couleurs différentes et/ou l'élément d'image (10) produit par le laser et la couche d'arrière-plan (5, 50) ou la couche de premier plan sont conçues en couleurs et/ou différemment en ce qui concerne la structure optique.
  9. Image multicouche selon l'une quelconque des revendications précédentes, caractérisée en ce que l'élément d'image (10) produit par le laser est conçu comme une marque transparente incolore ou transparente teintée ou noire, de préférence transparente teintée de dégradés de gris ou non transparente colorée et/ou noire et/ou dégradée de gris.
  10. Image multicouche selon l'une quelconque des revendications précédentes, caractérisée en ce qu'à côté de l'élément d'image (10) produit par le laser, de préférence contigu à celui-ci, dans la même couche sensible au laser est disposé un autre élément d'image produit par le laser ou une zone non traitée par le laser de la couche sensible au laser ou une zone non sensible au laser, étant prévu de préférence que cette zone voisine soit conçue de manière incolore, transparente ou transparente teintée ou non transparente.
  11. Image multicouche selon l'une quelconque des revendications précédentes, caractérisée en ce qu'à côté de l'élément d'image (10) produit par le laser, de préférence contigu à celui-ci, est conçu un élément d'image formé dans la couche d'arrière-plan et/ou dans la couche de premier plan.
  12. Image multicouche selon l'une quelconque des revendications précédentes, caractérisée en ce que l'élément d'image produit par le laser est disposé de manière exactement ajustée à l'élément d'image attribué qui est formé dans et/ou par la couche d'arrière-plan ou la couche de premier plan.
  13. Image multicouche selon l'une quelconque des revendications précédentes, caractérisée en ce que l'élément d'image produit par le laser est conçu de manière incolore ou transparente teintée et un élément d'image attribué à celui-ci, disposé dans une couche se trouvant dessous ou dessus, de préférence dans une couche d'arrière-plan ou une couche de premier plan est disposé en alignement ou en décalage latéral par rapport à celui-ci dans le sens perpendiculaire au niveau des couches.
  14. Image multicouche selon l'une quelconque des revendications précédentes, caractérisée en ce que l'élément d'image produit par le laser est conçu de préférence en combinaison avec un autre élément d'image produit par le laser et/ou avec un élément d'image formé par la couche d'arrière-plan et/ou la couche de premier plan comme une marque colorée et/ou un graphique et/ou un guillochis et/ou une légende et/ou une microécriture.
  15. Image multicouche selon l'une quelconque des revendications précédentes, caractérisée en ce que le matériau (4) sensible au laser est conçu comme un matériau qui peut être modifié sous l'effet du laser sur la décoloration produite par le laser ou sur le changement de couleur produit par le laser et/ou sur le noircissement produit par le laser et/ou sur la suppression du matériau produite par le laser, de préférence lors de conditions relatives au laser spécifiques au matériau, et l'élément d'image produit par le laser est formé par la décoloration produite par le laser ou par la conversion de couleur produite par le laser ou la carbonisation produite par le laser ou la suppression du matériau produite par le laser.
  16. Image multicouche selon l'une quelconque des revendications précédentes, caractérisée en ce que pour chacun des deux composants, de préférence trois, s'applique le fait que dans les conditions relatives au laser spécifiques à un composant, les autres composants ne peuvent pas ou essentiellement pas être décolorés ou altérés dans leur couleur.
  17. Image multicouche selon l'une quelconque des revendications précédentes, caractérisée en ce que le matériau sensible au laser présente un colorant cyan, de préférence un pigment cyan et/ou un colorant magenta, de préférence un pigment magenta et/ou un colorant jaune, de préférence un pigment jaune.
  18. Image multicouche selon l'une quelconque des revendications précédentes, caractérisée en ce que la couleur est formée à un endroit de l'élément d'image produit par le laser et/ou à un endroit de la couche sensible au laser, de préférence au moins partiellement à tout endroit de l'élément d'image produit par le laser ou de la couche sensible au laser par un composant ou par plusieurs composants différents du mélange de colorants, de préférence tous les composants différents du mélange de colorants qui sont disposés à cet endroit dans un mélange, de préférence les uns sur les autres et/ou les uns à côté des autres et la couleur est alors formée à cet endroit par un mélange de couleurs de préférence soustractif.
  19. Image multicouche selon l'une quelconque des revendications précédentes, caractérisée en ce qu'exceptée la couche d'arrière-plan (5, 50) et de préférence les autres couches restantes, la couche sensible au laser est conçue de telle sorte que la couche d'arrière-plan (5, 50) ne soit pas modifiée sous l'effet du laser servant à former l'élément d'image produit par le laser.
  20. Image multicouche selon l'une quelconque des revendications précédentes, caractérisée en ce que la couche d'arrière-plan et/ou la couche de premier plan et/ou la couche sensible au laser présente au moins partiellement une structure réfléchissante et/ou une couche métallique et/ou une couche de laque qui est conçue en particulier comme une couche claire, par ex. une couche de laque blanche.
  21. Image multicouche selon l'une quelconque des revendications précédentes, caractérisée en ce que la couche d'arrière-plan (5, 50) et/ou la couche de premier plan et/ou la couche sensible au laser (4, 40) présente au moins partiellement une structure de diffraction et/ou d'hologramme (5b, 50b), par exemple un réseau de diffraction, un hologramme ou similaires, notamment dans ou avec une couche métallique.
  22. Image multicouche selon l'une quelconque des revendications précédentes, caractérisée en ce que la couche d'arrière-plan et/ou la couche de premier plan présente au moins partiellement une impression (5d).
  23. Image multicouche selon l'une quelconque des revendications précédentes, caractérisée en ce que la couche d'arrière-plan présente de préférence des éléments de marquage fluorescents avec de la lumière ultraviolette et/ou un fil de sécurité et/ou un filigrane.
  24. Image multicouche selon l'une quelconque des revendications précédentes, caractérisée en ce que la couche d'arrière-plan présente de préférence la structure réfléchissante et/ou la structure de diffraction et/ou d'hologramme et/ou l'impression sur son extension, sur différentes zones, de préférence avec différentes couleurs et/ou une structure différente, ou en ce que la couche d'arrière-plan (5, 50) est conçue constamment de manière homogène sur son extension.
  25. Image multicouche selon l'une quelconque des revendications précédentes, caractérisée en ce que l'image multicouche est conçue comme une image de couleurs pures qui présente de préférence les couleurs de l'ensemble de l'espace chromatique.
EP02740325A 2002-05-08 2002-05-08 Image multicouche, en particulier image multicolore Expired - Lifetime EP1501688B8 (fr)

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JP (1) JP2005530186A (fr)
CN (1) CN100406274C (fr)
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DE (2) DE50211300D1 (fr)
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AU2002315676A8 (en) 2003-11-11
DE50211300D1 (de) 2008-01-10
JP2005530186A (ja) 2005-10-06
CN1649747A (zh) 2005-08-03
US7368217B2 (en) 2008-05-06
CN100406274C (zh) 2008-07-30
ES2296945T3 (es) 2008-05-01
EP1501688B8 (fr) 2008-02-20
AU2002315676A1 (en) 2003-11-11
US20050118537A1 (en) 2005-06-02
EP1501688A1 (fr) 2005-02-02
WO2003095226A1 (fr) 2003-11-20

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