JP3880014B2 - Hologram laminate - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hologram laminate that can effectively prevent forgery.
[0002]
[Prior art and problems to be solved by the invention]
Various information including names are recorded on information carriers such as identification cards and credit cards, which are important and are required not to be counterfeited. However, there is a possibility that the hologram is counterfeited by means such as peeling off the hologram and copying it, or replacing it with another one.
[0003]
An object of the present invention is to solve the above-mentioned problems and to provide a hologram laminate that can improve the ability to prevent forgery.
[0004]
[Means for Solving the Problems]
In order to achieve the above object, the hologram laminate according to claim 1 is a hologram laminate in which a hologram is bonded to a base material by an adhesive layer, and only the hologram has an outline of an image recorded on the hologram. A perforation is formed along the line.
The hologram laminate according to claim 2 is characterized in that, in the hologram laminate according to claim 1, the image recorded on the hologram has a shape in which protrusions with sharp edges at the ends are connected. .
[0005]
A hologram laminate according to claim 3 is the hologram laminate according to claim 1 or 2, wherein a colored layer is formed between the hologram and the substrate .
A hologram laminate according to claim 4 is the hologram laminate according to claim 1, 2, or 3, wherein a transparent protective sheet is adhered to the surface of the hologram by an adhesive layer.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments will be described with reference to the drawings.
FIG. 1 is a plan view showing a first embodiment according to the present invention, and a perforation M is formed in the hologram 1. In FIG. 1A, only one straight perforation M is formed, and in FIG. 1B, two straight perforations M are formed. In FIG. 1C, a rectangular perforation M is formed, and in FIG. 1D, the perforation M is formed in the shape of the letter A. Further, in FIG. 1 (e), the outline of the perforation M has a substantially triangular shape, a substantially serrated shape, or the like in which protrusions with sharp tips are connected, that is, a so-called jagged shape. The shape of the perforation M is not limited to this, and may be an appropriate shape.
[0007]
In addition, it is arbitrary in which part of the hologram 1 the perforation M is formed, but it is desirable to form it in the part where the image is recorded. In particular, along the contour of the image recorded in the hologram 1 When formed, the perforation M is not noticeable, which is desirable. An example is shown in FIG. FIG. 2A shows a hologram 1 on which four star-shaped images are recorded. However, with respect to such a hologram 1, as shown in FIG. A perforation M is formed along the outline of two star-shaped images. In this way, the recorded image will not be peeled off even if the hologram 1 is peeled off, so it is easy to forget that it has been forged even if the peeled portion is copied or replaced with another one. Because you can.
[0008]
This perforation M can be formed using a laser, for example. The size of each hole of the perforation M can be arbitrarily set, but if it is large, the appearance may be deteriorated, so a smaller one is desirable.
[0009]
The hologram 1 may be a reflection type hologram or a transmission type hologram.
As a reflection hologram, it is desirable to use a Lippmann hologram because of its characteristic, but other than that, natural light or normal illumination such as a relief-type rainbow hologram which is substantially reflective by providing a reflection layer on the back surface. A reflective type that can be reproduced by light can be used.
[0010]
Here, the Lippmann hologram will be described as follows. The Lippmann hologram is recorded in an arrangement as shown in FIG. 3A and reproduced on the principle as shown in FIG. In the recording of a Lippmann hologram, a coherent object beam 11 having information on a recording object O is incident from one side of a hologram sensitive material 10 having a thickness such as a photopolymer or a silver salt photosensitive emulsion, and at the same time, a coherent reference having the same wavelength. When the light 12 is incident at a predetermined angle from the opposite side, the object light 11 and the reference light 12 interfere in the hologram sensitive material 10 to record a Lippmann hologram (volume hologram interference fringe). When reproducing the hologram, when the hologram recording body 20 (hologram sensitive material 10) on which the Lippmann hologram was recorded was irradiated with the reproduction illumination light 22 from the same direction as the reference light 12 at the time of recording, the incident light was recorded. Diffracted by the volume hologram interference fringe, the diffracted light 23 is diffracted in the same direction as the light emitted from the position of the recording object O, and the reproduced image O ′ is reproduced at the position of the original recording object O. Alternatively, when the reproduction illumination light 22 traveling opposite to the reference light 12 at the time of recording is applied to the back surface, the reproduction image is reproduced at the position of the original recording object O. In any case, the Lippmann hologram 2 reproduces a recorded reproduction image of a three-dimensional object or a planar object in a predetermined space.
[0011]
The characteristics of such a Lippmann hologram are that it can be reproduced by ambient light such as room illumination light, has wavelength selectivity, has angle selectivity, can record and reproduce three-dimensional objects, and can perform multiple recording. is there.
[0012]
Therefore, when a Lippmann hologram is used as the hologram 1 in FIG. 1, the pattern recorded on the Lippmann hologram is observed as a specific colored pattern floating in the air by the illumination light.
[0013]
Further, as a transmission type hologram, it is desirable to use a transmission type and volume type hologram. Therefore, the transmission-type volume hologram will be described as follows.
[0014]
The transmission type volume hologram is recorded in the arrangement as shown in FIG. 4A and reproduced on the principle as shown in FIG. 4B. In recording an image, a coherent object beam 31 having information on the recording object O is incident from one side of a thick hologram sensitive material 30 and a coherent reference beam 32 having the same wavelength is incident at a predetermined angle from the same side. By doing. As a result, the object beam 31 and the reference beam 32 interfere with each other in the hologram sensitive material 30, and a volume hologram interference fringe is recorded.
[0015]
When reproducing a hologram, the hologram recording body 40 (hologram sensitive material 30) on which an image is recorded is irradiated with reproduction illumination light 32 from the same direction as the reference light 32 at the time of recording. As a result, the incident light is diffracted by the recorded volume hologram interference fringes, and the diffracted light 33 is diffracted in the same direction as the light emitted from the position of the recording object O, and is reproduced at the position of the original recording object O. The image O ′ is reproduced. Alternatively, when the reproduction illumination light 32 traveling opposite to the reference light 32 at the time of recording is applied to the back surface, the reproduction image is reproduced at the position of the original recording object O.
[0016]
Therefore, when the hologram 1 shown in FIG. 1 is substantially reflective by providing a reflection layer on the back surface of such a transmission-type volume hologram, the hologram 1 is recorded on the transmission hologram by illumination light. The design will be observed floating in the air.
[0017]
As described above, since this hologram 1 is very easy to break, the ability to prevent forgery can be greatly improved as compared with the prior art.
[0018]
FIG. 5 is a cross-sectional view showing a configuration example of a hologram laminate formed by sticking the hologram 1 shown in FIG. In FIG. 5, the hologram shown in FIG. 1B is used.
[0019]
The hologram 1 is affixed to the substrate 2 with an adhesive layer 3, and a transparent protective sheet 5 is affixed to the surface of the hologram 1 with an adhesive layer 4.
[0020]
Here, the substrate 2 is formed of paper having an appropriate thickness, plastic, metal, or the like. It may be a transparent material or an opaque material. Moreover, although not shown in figure, this base material 2 is recorded with predetermined individual information such as name, age, sex, and identification number. Further, a face photograph may be affixed to the base material 2. Such individual information may be recorded at a location where the hologram 1 is attached, or may be recorded at a location other than the location where the hologram 1 is attached. In short, photographs and individual information can be recorded at appropriate locations on the substrate 1 as necessary. Here, when the hologram 1 is pasted on the individual information recorded on the base material 2 or on the photograph pasted on the base material 2, it is natural that the hologram 1 needs to be a transmission type. is there.
[0021]
Such individual information can be recorded by known means such as handwriting, type, and printer, using means that use toner, heat-melting type transfer ribbon, type ribbon, printing ink, and the like. it can. It can also be recorded by magnetic recording. Furthermore, when the base material 2 is formed of plastic or metal, it can be recorded by embossing. The information carrier may be an identification card, a credit card, or generally recorded predetermined individual information.
[0022]
As an adhesive for forming the adhesive layers 3 and 4, an elastomer adhesive such as natural rubber, recycled rubber, chloroprene rubber, nitrile rubber, styrene / butadiene rubber, thermoplastic elastomer, etc. Synthetic resin adhesives such as epoxy resins and polyurethanes, chemically reactive adhesives such as reactive acrylics and cyanoacrylates, other UV curing adhesives, EB curing adhesives, and ethylene / vinyl acetate Hot melt adhesives such as copolymer resin hot melt, polyamide, polyester, thermoplastic elastomer, and reactive hot melt, water soluble adhesives that are aqueous adhesives, emulsion adhesives, and latex adhesives An adhesive, an inorganic adhesive, etc. can be used. As a bonding method, thermoplastic materials may be sandwiched between laminates and heated to a temperature above the curing point, and UV and EB curable materials may be sandwiched between laminates and irradiated with ultraviolet rays or electron beams. It is better to cure the adhesive, and the adhesive type is simply sandwiched between the laminates.
[0023]
The adhesive strength of the adhesive layers 3 and 4 may be the same, but when the hologram 1 is peeled off, the base material 2 side of the transparent protective sheet 5 side of the adhesive layer 4 is left so that the hologram 1 remains on the base material 2 side. It is preferable to increase the adhesive force of the adhesive layer 3. In order to make a difference in the adhesive strength of the adhesive, the composition of the adhesive and the composition ratio may be changed. Specifically, for example, an acrylic adhesive may be used for the adhesive layer 3 and a silicone adhesive may be used for the adhesive layer 4. In addition, the amount of tackifier resin, which is known to improve adhesion, is adjusted, and a large amount of tackifier resin is added to the adhesive layer 3, and the amount of tackifier resin added to the adhesive layer 4 Less.
[0024]
Examples of the transparent protective sheet 5 include a polyethylene film (PE), a polypropylene film (PP), an ethylene-vinyl alcohol copolymer film (EVOH), a polyvinyl alcohol film (PVA), a polymethyl methacrylate film (PMMP), and a polyether. A sulfone film (PES), a polyamide film (nylon film), a tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer film (PFA), or the like can be used.
[0025]
Now, as shown in FIG. 5, in the configuration in which the hologram 1 with the perforation M is pasted on the base material 2, when the hologram 1 is to be peeled off, the hologram 1 is torn along the perforation M or cannot be torn. Since it is very likely to be deformed, it can be easily discriminated that it has been forged even when it is copied using this or replaced with another one. In particular, as shown in FIG. 1 (e), when the outline of the perforation M is formed into a shape in which protrusions having sharp tips such as a substantially triangular shape or a substantially saw-tooth shape are joined together, the tips of the protrusions It is effective because it is easily broken from the part.
[0026]
In addition, when the adhesive force of the adhesive layer 3 is made larger than that of the adhesive layer 4 in FIG. 5, the adhesive force of the adhesive layer 3 is strong even if it is not torn from the perforation M when trying to peel off the hologram 1. The hologram 1 is very likely to remain on the substrate 2 side, and it is very difficult to peel off the hologram 1 from the substrate 2 in a complete state, so that it is more preferable from the viewpoint of preventing counterfeiting.
[0027]
In FIG. 5, the hologram 1 is bonded to the base material 2 by the adhesive layer 3, but in order to improve the contrast of the reproduced image of the hologram 1, an adhesive layer is provided below the hologram 1 in the figure. A colored layer may be formed, and the colored layer may be bonded to the substrate 2 by an adhesive layer. In this case, the adhesive layer for adhering the hologram 1 and the colored layer can be formed with the adhesive exemplified above.
[0028]
As described above, even if such a hologram 1 is pasted on a base material, even if the hologram 1 is peeled off and copied or replaced with another one, it is easily recognized that the hologram 1 has been forged. Therefore, it is possible to greatly improve the anti-counterfeiting ability as compared with the conventional case.
[0029]
Although the embodiments of the present invention have been described above, it will be apparent to those skilled in the art that the present invention is not limited to the above-described embodiments and can be variously modified.
[Brief description of the drawings]
FIG. 1 is a plan view showing an embodiment of a hologram according to the present invention.
FIG. 2 is a diagram showing an embodiment of a hologram according to the present invention.
FIG. 3 is a diagram for explaining a method of recording / reproducing a Lippmann hologram.
FIG. 4 is a diagram for explaining a transmission / volume hologram recording / reproducing method.
FIG. 5 is a cross-sectional view showing a state in which the hologram 1 shown in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Hologram 2 ... Base material 3, 4 ... Adhesive layer 5 ... Transparent protective sheet

Claims (4)

In the hologram laminate in which the hologram is bonded to the substrate by the adhesive layer,
Only the hologram has a perforation formed along the contour of an image recorded on the hologram. 2. The hologram laminate according to claim 1, wherein the image recorded on the hologram has a shape in which protrusions having tips with acute angles are connected. The hologram laminate according to claim 1 or 2, wherein a colored layer is formed between the hologram and the substrate.   The hologram laminate according to claim 1, wherein a transparent protective sheet is attached to the surface of the hologram by an adhesive layer.

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