EP2561408A1 - Objet fabriqué selon un procédé de moulage et marqué avec une grille de diffraction, et son procédé de fabrication - Google Patents

Objet fabriqué selon un procédé de moulage et marqué avec une grille de diffraction, et son procédé de fabrication

Info

Publication number
EP2561408A1
EP2561408A1 EP11711912A EP11711912A EP2561408A1 EP 2561408 A1 EP2561408 A1 EP 2561408A1 EP 11711912 A EP11711912 A EP 11711912A EP 11711912 A EP11711912 A EP 11711912A EP 2561408 A1 EP2561408 A1 EP 2561408A1
Authority
EP
European Patent Office
Prior art keywords
molding process
areas
lattice
regions
article
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
EP11711912A
Other languages
German (de)
English (en)
Inventor
Klaus Franken
Alfred Rutz
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
Original Assignee
Unica Technology AG
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 Unica Technology AG filed Critical Unica Technology AG
Publication of EP2561408A1 publication Critical patent/EP2561408A1/fr
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/02—Details of features involved during the holographic process; Replication of holograms without interference recording
    • G03H1/0236—Form or shape of the hologram when not registered to the substrate, e.g. trimming the hologram to alphanumerical shape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/37—Mould cavity walls, i.e. the inner surface forming the mould cavity, e.g. linings
    • B29C45/372—Mould cavity walls, i.e. the inner surface forming the mould cavity, e.g. linings provided with means for marking or patterning, e.g. numbering articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
    • B29C37/0053—Moulding articles characterised by the shape of the surface, e.g. ribs, high polish
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2027/00—Use of polyvinylhalogenides or derivatives thereof as moulding material
    • B29K2027/06—PVC, i.e. polyvinylchloride
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/0005—Adaptation of holography to specific applications
    • G03H1/0011—Adaptation of holography to specific applications for security or authentication
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/02—Details of features involved during the holographic process; Replication of holograms without interference recording
    • G03H1/0276—Replicating a master hologram without interference recording
    • G03H2001/0284—Replicating a master hologram without interference recording by moulding
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H2270/00—Substrate bearing the hologram
    • G03H2270/52—Integrated surface relief hologram without forming layer

Definitions

  • the present invention relates to a marked object produced by an original molding method, wherein the marking comprises a lattice structure on or in its surface, the lattice structure having a lattice constant which generates a diffraction structure when the lattice structure is exposed to light visible to the human eye.
  • WO 2006/027688 a process for the production of tablets is known, on which a visible flex microstructure is introduced.
  • the flex microstructure of the article When the flex microstructure of the article is irradiated with white light, it shows a hologram-like rainbow effect. This visual effect may indicate the authenticity of the tablet.
  • the microstructures are grating structures with 500 nanometers to a few microns distance. They are obtained by pressing or molding with a press tool having the negative version of the microstructure. The method is only aimed at the pressing of tablets in the pharmaceutical sector and not generally applicable.
  • An article having the features of the preamble of claim 1 is known from US 2004/0187997, in which a decorative element is applied to a rubber tire. become.
  • the decorative element comprises various macroscopic areas with dimensions of each square centimeter, each with a lattice structure oriented at different angles to each other. Thus arises for the viewer with natural lighting from a different scattering and reflective Elements composed motif.
  • the lattice constant is given as advantageous at 0.5 to 0.7 microns with a motif height of between 0.1 and 0.3 microns.
  • the object of the invention is to specify a marked article and a method for producing a diffractive optical security feature in plastic articles of utility.
  • the grid structure has at least two areas, wherein the grid lines of different areas are each phase-shifted from one another or angularly displaced.
  • a marked object produced by a primary shaping method comprising a lattice structure on or in its surface, wherein the lattice structure has a lattice constant which generates a diffraction structure when the lattice structure is exposed to light visible to the human eye.
  • Either different diffraction structures are produced with this grating structure, or surfaces with and without diffraction structures form on the surface, which together form an optically recognizable symbol.
  • the individual, in particular macroscopic, elements of the optically recognizable symbol are subdivided into a multiplicity of, in particular microscopic, regions, wherein the grating lines of different regions are in each case phase-shifted relative to one another and / or are angularly offset.
  • An advantage of the invention lies in the fact that the security feature for a consumer can be checked with the naked eye under the conditions that can be reached at the point of sale of the article of daily use. On the other hand, the security feature is not disturbing because the hologram is not visible in normal diffuse room lighting.
  • the areas mentioned in the claims are microscopic and are not visible to the viewer macroscopically, especially in normal diffuse room lighting and are visible only when using a strong light source such as a halogen spotlight, a strong LED lamp or direct sunlight.
  • the verifiability is mainly, but not exclusively, to recognize the new, for example, originally packaged item.
  • the structures of the security element for example due to grease or dust, settle. By cleaning, the structure can be re-exposed and made visible by the mentioned illumination. Thus, the authenticity can also prove later.
  • the article is advantageously at least partially made of one Soft polymer, in particular made of PVC-P, wherein the primary molding process is an injection molding process and the lattice structure in the surface of the soft polymer.
  • a substance with a shrinkage volume of at least 1% is used and / or the substance is granular with grains in the region of the lattice constant.
  • a lattice constant of the lattice structure between 200 nanometers and 5 micrometers, preferably between 500 and 1200 nanometers, is advantageously used in the marked object.
  • the invention provides a method with the features of claim 6, with which an article according to the invention can be produced.
  • the method for marking an object during its manufacture comprises forming a lattice structure on or in the surface of the article, wherein the marker has a lattice structure with a lattice constant, which generates a diffraction structure when exposed to the lattice structure with visible to the human eye light
  • the lattice structure is produced by a primary shaping method of the object and either provides different diffraction structures or the surface is in areas with and regions without diffraction structures which together form an optically recognizable symbol.
  • the mold used in the primary molding process is equipped with a negative version of said lattice structure.
  • these individual elements of the optically recognizable symbol are subdivided into a plurality of, in particular microscopic, regions, the lattice lines of different regions being phase-shifted relative to each other and / or angle shifted.
  • Fig. 1 shows a sketch of a power plug as a marked object according to an embodiment of the invention
  • FIG. 2 shows a section of the article with individual grid areas of the marking not shown in scale
  • Fig. 3 shows an SEM image with individual grating areas
  • FIG. 4 shows a detail of the article with a plurality of motif areas and in these existing grid areas in a detailed representation.
  • FIG. 1 shows a schematic sketch of a power plug 1 at the end of a power cable 2 with two contact pins 3 here.
  • the plug 1 is injection molded, that is to say in a tool on an injection molding machine through the enclosure of the cable 2 and the contact pins 3 produced by a plastic mass in a single process step.
  • the manufacturing process of a security feature on a plastic utility object uses the injection molding process.
  • an injection molding tool not shown in the drawings is used.
  • an insert with the holographic structure is introduced as a negative master in the injection mold. If the object to be molded is to be provided over a large area with the holographic structure, the injection mold was correspondingly large area provided as such with the negative holographic structure.
  • the diffractive structures may be raised or recessed.
  • the security feature is produced in the normal production process by molding the surface structure of the negative master.
  • Curved surfaces can be parts of spherical surfaces or partially spherical surfaces, or cylinder jacket surfaces.
  • the surfaces can thus be simple, i. be bent about an axis, or twice, about two mutually perpendicular axes. Corresponding security features are even more difficult to fake.
  • the holographic structure 10 on the front side 11 of the plug 1, from which the contact pins 3 protrude, is arranged centrally between these contact pins 3. It is square, it can also have a different shape. It can also extend around one or more contact pins 3. It can also be arranged on curved surfaces of the plug such as cambered side surfaces 4 of the plug or Rejuqungsfizzen 5 on the transition to the cable 2.
  • the structure 10 is the image of a negative master provided on the injection molding tool.
  • the negative master is a diffraction structure.
  • a diffractive structure includes one or more microstructures and grids. These each contain a large number of line-like structures, which in the simplest case are straight, parallel and equidistant. These are ridges or furrows on the surface. These ridges / grooves have a distance of 200 nanometers to 5 microns to each other. This distance is also called the lattice constant. In particular, they are advantageously spaced 500 nanometers to 3 micrometers, 500 to 1200 nanometers, and more preferably between 700 nanometers and 2 micrometers. They form a reflection grid on the utensil after the impression.
  • a plurality of these grids are of different orientation to display a recognizable image or graphic information under illumination.
  • the lattice constants are always in the range between 0.2 and 5 microns, which allows observation of the diffraction structures with the naked eye in many areas.
  • Applicant has used various masters in experiments, for example gratings with a period of 700 nanometers.
  • the structure depth of the grating of a region homogeneous in the master was 50 to 600 nanometers in one embodiment, and in another master the height of the grating structure was 50 to 400 nanometers.
  • the negative master of the injection mold is made of a hard metal such as steel or a hard-coated metal, for example a metallic multilayer structure with an outer hard nickel layer, in order to ensure high quantities in injection molding. Due to the low operating pressures, it is also possible to provide inserts in the injection molds, which consist of materials that are easier to process, such as nickel.
  • the injection molding process can be carried out with an open mold.
  • Such an open shape also allows the overmolding of chains, ropes or cables.
  • pressures of 200 to 600 bar are used in contrast to pressures of 800 to 2000 bar in conventional plastic injection molding.
  • FIG. 2 shows a section of this plug 1 with individual grid areas 21, 22 and 23 of the marking, ie the structure generated with the negative master.
  • This structure is not uniform as the master.
  • the grating structure here has three regions 21, 22 and 23, wherein the grating lines 31, 32, 33 of different regions 21, 22 and 23 are respectively phase-shifted relative to each other.
  • the grid lines 31, 32 and 33 are each, for example, the raised structures in the surface.
  • the grid lines 31 in the region 21 are arranged parallel to one another and have a certain distance from one another.
  • the grating lines 33 of the region 23 are transversely displaced relative to the grating lines of the regions 21 and 22, wherein the grating lines of different regions are in particular angularly displaced relative to one another, which also leads to a weakening of the resulting image from elements of the two regions which overlap each also out of phase.
  • each one of said areas 21, 22 and 23 forms a diffraction structure.
  • the unarmed eye looking for the security feature 10 between the pins 3 will not see it in poor or inappropriate lighting because the diffractive structures in the image taken by the eye cancel each other out. Only in strong lighting, for example, then the structure can be seen, with such lighting is given by the use of a strong light source such as a halogen or a strong LED lamp or by direct sunlight.
  • the security feature 10 does not form a uniform square but a character with recognition value, ie it has either different diffraction areas or areas with and areas without diffraction structures that form the symbol.
  • Such a symbol may then comprise the areas forming a cloverleaf in US 2004/0187997 in FIGS. 3 and 4.
  • Soft PVC is also referred to as PVC-P, which is a blend of the polymer and a plasticizer. More generally, polymers can be used which have a large volume of shrinkage and a low viscosity. In particular, the soft polymer may have a shrinkage volume of at least 1% or at least 5% and / or be granular.
  • the security feature 10 can be used for example in a very simple manner on the housing 1 of power cables 2, for example on the front side of the connector surface 11 in which the electrical contacts are mounted.
  • Other plugs are plugs of USB cables, cables themselves and all products made as PVC molded parts.
  • multi-part housings for example of electrical appliances, are to be provided in this manner with a security feature 10.
  • FIG. 3 shows an SEM image with individual grating regions.
  • the scale can be recognized by specifying the distance of 1 micrometer.
  • the grid structure is well shaped from the profile. There are a number of grid lines. However, the lines of the grid are not parallel or not in phase in several areas.
  • the third line 41, ie the third elevation, from the top in the right image area is in the left image area in a valley between two lines, ie 180 degrees out of phase.
  • a further line provided with the reference numeral 42 is 180 degrees out of phase where it ends.
  • shifts between 60 and 180 degrees, or between 90 and 180 degrees can occur between each of the groups of lines.
  • the lines in the lower right area for example, one referred to as line 43, are not parallel to the lines 41 and 42 in the upper area. This corresponds macroscopically to curvatures of the grid lines.
  • the lines which are out of phase with each other, partially compensate for the diffraction effects, so that the security feature is visible as a so-called hidden feature only under special illumination.
  • the individual areas, which can be identified by the lines 41, 42, 43, can have a size of 5 by 5 microns to.
  • the security feature 10 consists of a base 55 and here four different motif areas 51, 52, 53 and 54,
  • the motif areas can also contain picture elements, in particular nested picture elements
  • the base area 55 can also be a grid area in the illustrated embodiment But there are other dimensions of the range 10 possible, from under 5 times 5 millimeters to several square centimeters.
  • Each individual motif area 51, 52, 53 and 54, and thus the image as such, is difficult to perceive in itself under normal illumination by a viewer. This is due to the fact that the said plurality of grating regions 21, 22 and 23 exist in each individual motif region. It is shown here in FIG. 4, for example, in the motif area 51, the letter "L", an enlarged area 50, not drawn to scale, and illustrated by way of example with three or more hundreds of such areas 21, 22, 23 all the symbol, here build the "L". From the Fig. 4 can be recognized by the scale comparison between connector 1, security feature 10, therein letter "L” 51 and finally section 50 of this letter "L” that the sizes of the individual areas in the range of, for example, from 5 times Micrometer are located.
  • a logo component 51 such as the letter L with dimensions on a base of 10 millimeters by 6 millimeters with a "line width" of 2 millimeters can then have a surface area of 28 square millimeters between less than 100 and 1 million such areas 21, 22, 23
  • this information is based on square areas only rough and by way of example, the individual areas 21, 22, 23 have a resulting from the production form and can also very irregular shapes have, as can be seen from the not sharply limited transition regions in FIG.
  • Another application of the present invention is to create an actively distorted diffraction grating in the master, which is then redone by fading To produce deteriorated diffraction grating in the article 1.
  • This deteriorated diffraction grating in the article 1 would then be improved only by applying a mechanical pressure and thus inhomogeneous distortion of the security feature area 10, so that it is visible.
  • Grid structure 50 enlarged area

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Diffracting Gratings Or Hologram Optical Elements (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

Le procédé selon l'invention pour le marquage d'un objet (1) pendant sa fabrication consiste à former au moins une structure de grille (10) sur ou dans la surface de l'objet (1). Celle-ci comporte une constante de grille qui permet une observation à l'oeil nu des structures de diffraction pouvant être produites avec la lumière visible. La ou les structure(s) de grille (10) est (sont) produite(s) selon un procédé de moulage de l'objet (1), lors duquel le moule utilisé comporte une version en négatif de ladite structure de grille. L'objet (1) est alors constitué au moins partiellement d'un polymère souple, en particulier de PVC-P, le procédé de moulage étant un procédé de moulage par injection avec un moule ouvert. La structure de grille (10), du fait du moulage par injection, comprend au moins deux zones (21, 22, 23), les lignes de grille (31, 32, 33) des différentes zones (21, 22, 23) étant décalées respectivement les unes par rapport aux autres en phase et/ou en angle et le motif de diffraction se trouvant partiellement en relief de sorte que les structures de diffraction ne soient reconnaissables à l'œil nu que sous l'éclairage approprié.
EP11711912A 2010-04-22 2011-04-04 Objet fabriqué selon un procédé de moulage et marqué avec une grille de diffraction, et son procédé de fabrication Ceased EP2561408A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH5792010 2010-04-22
PCT/EP2011/055196 WO2011131475A1 (fr) 2010-04-22 2011-04-04 Objet fabriqué selon un procédé de moulage et marqué avec une grille de diffraction, et son procédé de fabrication

Publications (1)

Publication Number Publication Date
EP2561408A1 true EP2561408A1 (fr) 2013-02-27

Family

ID=42194723

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11711912A Ceased EP2561408A1 (fr) 2010-04-22 2011-04-04 Objet fabriqué selon un procédé de moulage et marqué avec une grille de diffraction, et son procédé de fabrication

Country Status (4)

Country Link
US (1) US9429911B2 (fr)
EP (1) EP2561408A1 (fr)
CN (1) CN102859450B (fr)
WO (1) WO2011131475A1 (fr)

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US20130292879A1 (en) * 2012-05-02 2013-11-07 Nanoink, Inc. Molding of micron and nano scale features
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CN107635788B (zh) * 2015-05-12 2020-06-05 尤尼卡技术股份有限公司 具有可个人化的磁性验真特征的数据载体
CN108709160A (zh) * 2018-06-15 2018-10-26 浙江彩丞照明科技有限公司 一种可对光线进行漫反射的眩光抑制板
WO2023107155A1 (fr) 2021-12-08 2023-06-15 Digimarc Corporation Procédés et dispositifs de marquage

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Also Published As

Publication number Publication date
CN102859450A (zh) 2013-01-02
US9429911B2 (en) 2016-08-30
WO2011131475A1 (fr) 2011-10-27
CN102859450B (zh) 2016-05-25
US20130038936A1 (en) 2013-02-14

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