JP4629262B2 - Invisible individual information recording material, label for pasting invisible individual information, and invisible individual information transfer sheet - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an invisible individual information recording material that can be determined by forming individual information on an invisible pattern that cannot be determined with the naked eye on a reflection layer of a hologram, and generating a moire pattern when overlapped with a confirmation pattern. Further, the present invention also relates to a recording material having such a structure as a label or transfer sheet for application to other adherends.
[0002]
[Prior art]
Articles that have direct or indirect economic or other value may be counterfeited by improper intentions, or may be altered so that they can be used as genuine, using genuine or used and discarded items. Easy to be targeted.
[0003]
Examples of such goods include items that generate monetary value when used, such as deposit and saving cards, credit cards, etc., and value stated on the face value such as banknotes, securities, gift certificates, etc. Such as stock certificates, lottery tickets, or betting tickets that have value determined by speculative or other factors, and passports or identification cards, but no monetary value is directly generated. Something that guarantees behavior.
High-priced watches and high-priced products such as so-called branded products are also subject to forgery and alteration.
[0004]
Conventionally, various measures have been taken to prevent forgery or alteration of these articles, but holograms are often used in cards, cash vouchers, expensive products, and the like.
Holograms are a combination of various non-generic technologies such as laser beam handling technology, photosensitive resin handling technology, and production of replication molds from the original hologram prototype. Therefore, it is difficult to reproduce by a method such as using a color copier or a color scanner because it is technically advanced and can express a stereoscopic effect.
[0005]
However, although hologram production is technically advanced, it can be counterfeited by the acquisition of technology, and efforts are being made to make hologram replication more difficult.
For example, Japanese Patent Application Laid-Open No. 11-277962 discloses an image forming body including a hologram forming layer and a hidden pattern forming layer in which a hidden pattern is configured with halftone dots or lines. As described above, the hidden pattern can be visualized by superimposing a confirmation pattern composed of halftone dots or lines separate from the image forming body.
[0006]
However, according to the above prior art, the hidden pattern is a common pattern formed for confirming the authenticity of the hologram, and there are many same holograms. When peeled and used, even if a hidden pattern is confirmed, it is unclear whether the hologram is properly pasted or whether the pasted article is legitimate.
In addition, since the hologram forming layer and the hidden pattern layer are separate layers, the presence of the hidden pattern becomes obvious if there is a careful separation, and there is a risk of duplication.
Therefore, a policy that can specify each hologram is further desired.
[0007]
[Problems to be solved by the invention]
Therefore, in the present invention, it has been difficult to confirm that a hologram separated from a legitimate object has been diverted in the above prior art, and the hidden pattern has been separated. Possible However, it is an object to avoid the possibility of being analyzed and copied.
[0008]
[Means for solving the problems]
In the above prior art, a hidden pattern formed on a layer different from the hologram forming layer is formed by irradiating a reflective layer such as a metal, which is one of the layers constituting the hologram, using a laser or the like. The above problems could be solved. Further, the problem can be solved by making the hologram including the hidden pattern as described above into a label structure or a transfer sheet structure.
[0009]
In the first invention, at least a hologram forming layer and a reflective layer are laminated, and the reflective layer has a reflectance different from that of a minute hole or the surroundings. Halftone dots, symbols, characters Consisting of a set of Consists of halftone dots or lines that are separate discriminators The present invention relates to an invisible individual information recording material characterized in that invisible individual information is formed by an invisible pattern that can form a moire pattern when superimposed on a confirmation pattern. The second invention is 2. The invisible individual information recording material according to claim 1, wherein different moiré patterns can be formed when the confirmation pattern is superimposed on the invisible pattern at different angles. It is about.
According to a third aspect of the invention, the hologram forming layer of the invisible individual information recording material according to claim 1 or 2 is laminated on the lower surface of the transparent base material sheet so as to face the transparent base material. The present invention relates to a label for sticking invisible individual information, wherein an adhesive layer is laminated on the lower surface of the reflective layer of the invisible individual information recording material. According to a fourth aspect of the present invention, the hologram forming layer of the invisible individual information recording material according to claim 1 or 2 is laminated on the lower surface of the transparent substrate sheet so as to face the transparent substrate. The present invention relates to a label for applying invisible individual information, wherein a heat-sensitive adhesive layer is laminated on the lower surface of the reflective layer of the invisible individual information recording material. According to a fifth aspect of the present invention, the hologram forming layer of the invisible individual information recording material according to claim 1 is laminated on the peelable surface of the bottom surface of the peelable support sheet so as to face the support sheet. Further, the present invention relates to a brittle label for applying invisible individual information, characterized in that an adhesive layer is laminated on the lower surface of the reflective layer of the invisible individual information recording material. In a sixth aspect of the invention, the hologram forming layer of the invisible individual information recording material according to claim 1 or 2 is laminated on the peelable surface of the lower surface of the support sheet so as to face the support sheet side. Further, the present invention relates to an invisible individual information transfer sheet, wherein a heat-sensitive adhesive layer is laminated on the lower surface of the reflective layer of the invisible individual information recording material.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described below with reference to the drawings.
As illustrated in FIG. 1, the invisible individual information recording material 1 of the present invention has a reflection layer 2 laminated on the lower surface of a hologram forming layer 3 on which a hologram is formed. The invisible individual information 4 is formed by an invisible pattern constituted by a set of
The invisible pattern may be composed of a set of fine areas having different reflectivity from the surroundings instead of a set of fine holes, or constituted by a set of fine holes or a set of fine areas having different reflectivity from the surroundings. Consists of halftone dots or lines.
The invisible individual information by the invisible pattern may be anything, but as an example, there is a combination of serial numbers, arbitrary letters and numbers, etc., as long as they can produce many different things. .
In this figure, the hologram forming layer 3 is drawn like a relief hologram having fine irregularities on the lower surface, but is not limited thereto.
[0011]
The invisible individual information 4 in the invisible individual information recording material 1 preferably has a moiré pattern by overlaying with a confirmation pattern consisting of a regular arrangement of halftone dots or lines, resulting in visibility. It is.
The invisible individual information recording material 1 can be used as it is for a tag or the like as it is. However, as will be described later, various articles are usually added by adding other layers. In many cases, it is used with a structure such as a label or a transfer sheet for application to the above.
[0012]
FIG. 2 shows an example of a label for invisible individual information pasting using the structure of the invisible information recording material 1. In this figure, the hologram forming layer 3, the reflective layer 2, And the adhesive layer 7 is laminated | stacked in order, and the label 5 for invisible separate information sticking is comprised. The lowermost pressure-sensitive adhesive layer 7 may be the heat-sensitive adhesive layer 7.
If necessary, a release paper or a release sheet may be attached to the lower surface of the pressure-sensitive adhesive layer 7.
The label 5 for sticking invisible individual information as shown in FIG. 2 can be applied onto the adherend as it is, with the pressure-sensitive adhesive layer 7 in contact with the label 5 as it is.
[0013]
FIG. 3 shows an example in which the structure of the invisible information recording material 1 is used to make a brittle label for attaching invisible individual information. In this figure, the support sheet 9 has a release layer laminated on the lower surface side. It is a peelable sheet, and the hologram forming layer 3, the reflective layer 2, and the pressure-sensitive adhesive layer 7 are sequentially laminated on the peelable surface on the lower surface of the peelable sheet to constitute a brittle label 8 for pasting invisible individual information. ing. When the hologram forming layer 3 exhibits releasability with respect to the support sheet 9, the release layer 10 may be omitted.
The lowermost pressure-sensitive adhesive layer 7 may be the heat-sensitive adhesive layer 7.
If necessary, a release paper or a release sheet may be attached to the lower surface of the pressure-sensitive adhesive layer 7.
[0014]
The brittle label 8 for sticking invisible individual information as shown in FIG. 3 can be applied to the adherend by peeling and peeling the peelable sheet, with the pressure-sensitive adhesive layer 7 side in contact as it is.
Compared with the label 5 for pasting invisible individual information (the one shown in FIG. 2), it has a similar structure before application to the adherend, but after application, the former has the transparent substrate 6 in the uppermost layer. In contrast, the latter, after application, has no equivalent to the transparent substrate 6 on the hologram forming layer 3, so that the hologram forming layer is easily broken by an external force.
[0015]
FIG. 4 shows an example of a transfer sheet using the structure of the invisible information recording material 1. From the top, the support sheet 9, the release layer 10, the hologram forming layer 3, the reflective layer 2, and the heat sensitive adhesive are shown. The layers 12 are laminated in order to constitute the invisible individual information transfer sheet 11.
Again, the release layer 10 may be omitted if the hologram-forming layer 3 exhibits peelability with respect to the support sheet 9.
The invisible individual information transfer sheet 11 as shown in FIG. 4 can be applied onto the adherend as it is, with the pressure-sensitive adhesive layer 7 side being in contact with each other and being pressure-bonded and peeled off. In the state of being attached to the adherend, the hologram forming layer and reflecting layer constituting the hologram are laminated via an adhesive layer, so it looks like the brittle label in the previous paragraph, but it is heat sensitive. Since the adhesive layer is solid at room temperature, the hologram can be reinforced and the adhesive layer in the brittle label cannot play the reinforcing role.
If necessary, a protective layer in contact with the hologram forming layer 3 in the invisible individual information transfer sheet 11 may be laminated in advance so that a protective layer is laminated on the hologram forming layer 3 after transfer.
[0016]
Here, the invisible pattern and the confirmation pattern will be described next.
FIG. 5A is a diagram illustrating the invisible pattern 21. The invisible pattern 21 includes a horizontally long rectangular pattern portion 21a at the center, a frame-shaped pattern portion 21b in contact with the four circumferences of the pattern portion 21a, and It consists of three parts of the background part 21c, and all of the three parts are composed of lines. Of these three portions, the pattern portion 21a and the pattern portion 21b are configured by the same upwardly rising lines, but the lines are shifted by 1/2 pitch in both pattern portions. The remaining background portion 21c is composed of right-down lines. It is assumed that two types of parallel lines having different directions (angles) used here are orthogonal to each other.
Note that a line means an aggregate in which lines having a constant width w are arranged at equal intervals with a pitch of 2w.
[0017]
FIG. 5B illustrates a confirmation pattern 22 for confirming the invisible pattern 21 in FIG. 5A, which is composed of a line that rises to the right, and that constitutes the confirmation pattern 22. The pitch and direction (angle) of the central portion of the invisible pattern 21 described with reference to FIG. 4A and the lines constituting the pattern portions 21a and 21b surrounding the periphery thereof are the same, and the background portion 21c is formed. The pitch of the lines is the same, but the directions are orthogonal to each other.
[0018]
FIG. 6 shows a state where the invisible pattern 21 and the confirmation pattern 22 in the above example are overlapped.
When the confirmation pattern 22 shown in FIG. 5B is overlaid on the invisible pattern 21 shown in FIG. 5A, the lines constituting the confirmation pattern 22 form the pattern portion 21 a in the center of the invisible pattern 21. As shown in FIG. 6A, the pattern portion 21a in the central portion looks the same as the original line shape, but is not a line in the surrounding frame-shaped pattern portion 21b. Since the line of the confirmation pattern 22 is filled in the part, as a result, the part of the frame-shaped pattern part 21b appears to be filled (indicated by the reference numeral of the moire pattern 23 in FIG. 6A).
[0019]
Further, the invisible pattern 21 and the confirmation pattern 22 are relatively shifted from the above state in which the confirmation pattern 22 is superimposed on the invisible pattern 21, and the lines constituting the confirmation pattern 22 are frame-shaped patterns of the invisible pattern 21. If it is made to just overlap on the line which comprises the part 21b, as shown in FIG.6 (b), although the frame-shaped pattern part 21b looks the same as the state of the original line, it is the pattern part 21a of the center part. Since the lines that are not lines are filled with the lines of the confirmation pattern 22, the central pattern portion 21 a appears to be filled (indicated by reference numeral of the moire pattern 23 in FIG. 6B). ).
[0020]
The portions other than the pattern portions 21 a and 21 b of the invisible pattern 21, that is, the background portion 21 c of the invisible pattern appear uniform because the state where the lines are orthogonal to each other does not change in any of the above cases.
[0021]
In FIG. 5A, since the invisible pattern 21 is shown in an enlarged manner, both the pattern portions 21a and 21b surrounding the central portion and the periphery thereof seem to be distinguished from the background portion 21c. In reality, however, the line width and pitch of each line are small, and the pattern portions 21a and 21b and the background portion 21c have the same proportion of the line portion in the unit area (FIG. 5A). In this example, it is 50% in any place.) Since there is no difference in density, it is very difficult to determine the invisible pattern 21 with the naked eye.
Here, the width of the line is preferably 200 μm or less, more preferably 100 μm or less. The lower limit is preferably 10 μm or more, more preferably 20 μm or more when the confirmation pattern is formed by printing. When the confirmation pattern is formed by other means, it may be smaller than these. The pitch of the line is twice the value of these widths. As will be described later, when a halftone dot is used instead of a single line, the diameter of the halftone dot (the length of the side in the case of a square) and the pitch are the same as the width and pitch of the above-described common line. is there.
[0022]
As shown in the above example, by overlapping the confirmation pattern 22 on the invisible pattern 21, the pattern portions 21a and 21b have a line portion ratio of 50% or 100%. A difference from the line ratio of 75% is generated, and visual recognition is possible.
[0023]
7 and 8 are diagrams showing another combination of the invisible pattern and the confirmation pattern. In any figure, (a) is a figure which shows an invisible pattern, all are comprised with a square halftone dot, the invisible pattern itself is common in FIG.7 and FIG.8, (b) shows all confirmation patterns. (C) is a figure which shows the state which piled up the confirmation pattern on all invisible patterns.
[0024]
The invisible pattern 31 is composed of halftone dots each having a square outer shape, and the vertical and horizontal grid lines are auxiliary to indicate that the positions of the halftone dots are intentionally shifted from the grid arrangement. A line that does not actually constitute an invisible pattern. The lattice lines are equally spaced vertically and horizontally, and the vertical lines and the horizontal lines are orthogonal to each other.
[0025]
First, with respect to the arrangement of the halftone dots in the left-right direction (in the general graph, the x-axis direction), the halftone dots in the leftmost column (referred to as the first column) of the invisible pattern 31 are all. On the upper right side of each grid point, the left side and the lower side of the halftone dot are arranged in contact with the grid line. The halftone dots in the top row (referred to as the first row) and the bottom row are arranged so that the left side of the halftone dot touches each grid.
Each other halftone dot is in the center between the grids in the left-right direction, provided that the left side of the four halftone dots in the fourth and fifth columns in the fourth and fifth columns touches the grid line. Yes.
Further, each halftone dot is arranged so as to be shifted slightly upward (in the graph, in the positive direction side of the y-axis) as it goes to the back row except for the halftone dot in the first row, and as a result, is the last row. The halftone dot in the eighth column is arranged at the center between the lattices in the y-axis direction.
[0026]
For the invisible pattern shown in FIG. 7A, the confirmation pattern 32 that can confirm the invisible pattern 31 is one in which each line is arranged in the x-axis direction (FIG. 7B), or each line is y. They are arranged in the axial direction (FIG. 8 (b)), and they are in a relationship in which the other is rotated by 90 °.
Each of the confirmation patterns is composed of lines, and the width of the lines is formed to be equal to one side of the halftone dot of the invisible pattern.
[0027]
First, the confirmation pattern 32 shown in FIG. 7B is overlaid on the invisible pattern 31 shown in FIG. Here, it is assumed that the horizontal lines of the grid lines of the invisible pattern 31 are overlapped so that the lower side of each line of the confirmation line 32 is in contact.
By doing so, the halftone dots in the first row are invisible because they are covered by the lines, but the halftone dots in the second and subsequent rows are arranged in the back row based on the displacement from the grid at the position where they are arranged. As the line goes up, it gradually appears beyond the lines of the line, and as a whole, a visual pattern with gradation is given in which the density increases toward the right side.
[0028]
Further, the confirmation pattern 32 shown in FIG. 8B is overlaid on the invisible pattern 31 shown in FIG. Here, the vertical lines of the lattice lines of the invisible pattern 31 are overlapped so that the left side of each of the lines constituting the confirmation pattern 32 is in contact.
By doing so, the halftone dots in the first column, the first row and the bottom row, which are arranged in contact with the grid lines, and the four rows in the fourth and fifth rows in the fourth and fifth columns The halftone dots are not visible because they are covered by all the lines, but the other halftone dots are all shifted to the right by the same amount from the grid where they are placed. As a whole, a visual pattern having a substantially frame-like outer shape is given.
[0029]
In the above example, an invisible pattern composed of lines and a confirmation pattern composed of lines, and a combination of an invisible pattern composed of halftone dots and a confirmation pattern composed of lines are explained. Less than outside A combination of an invisible pattern composed of halftone dots and a confirmation pattern composed of halftone dots, and an invisible pattern composed of lines and a confirmation pattern composed of halftone dots are also possible.
[0030]
The invisible individual information recording material 1 records invisible individual information consisting of an invisible pattern, and the confirmation pattern to be provided to a separate discriminator has a regular arrangement of halftone dots and lines. Can be recommended as a general method, but conversely, the invisible individual information recording material 1 is formed with a regular arrangement of halftone dots and lines, and a separate discriminator. It is technically possible to use an invisible pattern formed as a confirmation pattern to be held in the recording medium. Also, the confirmation pattern and the invisible pattern are mixedly formed on the invisible individual information recording material 1, and Correspondingly, a separate discriminator having an invisible pattern and a confirmation pattern can be used.
[0031]
In the example described with reference to FIG. 7 and FIG. 8, when the lines are overlapped, and the halftone dots and the lines are overlapped, interference is caused by the substantially parallel overlap so that the invisible pattern can be seen. However, even if they are not parallel, they may be overlapped with each other at a small angle that is relatively close to parallel, for example, 20 ° or less, or 15 ° or less.
In either case, if the halftone dots or lines overlap exactly, or if the object overlaid is larger, the lower one is not visible at all from the top, but the lower one is If the object protrudes from the object, an interference effect in which the part visually strengthens occurs. That is, the invisible pattern constituted by halftone dots or lines in the present invention interferes with the confirmation pattern constituted by halftone dots or lines. Note that a pattern that is visible due to interference is often referred to as a moire pattern. Therefore, in this specification, a visual pattern that is visible due to a confirmation pattern is also referred to as a moire pattern.
[0032]
Furthermore, the halftone dots referred to here may be formed in a shape other than a normal halftone dot shape such as a square or a circle, for example, a shape such as a symbol or a character. Also, the halftone dots may be arranged on a straight line, or may be arranged on a wavy line such as a curve or a sine curve. It may be in a shape.
A shape having a length several times or more than the line width does not have a halftone dot or a single line, but, apart from which one, it is “configured by a halftone dot or a single line in the present invention. It shall be included in the range of “ta”.
In addition, the halftone dots or lines constituting the invisible pattern and the confirmation pattern may not be constant, but may be changed in synchronization with each other in both the invisible pattern and the confirmation pattern.
[0033]
The transparent substrate 6 and the support sheet 9 serve to protect the invisible individual information recording material 1 of the present invention at least until it is applied to the adherend. In the case of the invisible individual information pasting label 5, the invisible individual information recording material 1 is protected even after application to the adherend.
Further, when the invisible individual information recording material 1 as described above is formed into a label, a transfer sheet, or the like having a structure, it is a target for forming each layer.
[0034]
Since the transparent substrate 6 and the support sheet 9 are often composed of a plastic film, among them, the support sheet 9 is peeled off when the invisible individual information recording material 1 is applied to the adherend. Although it does not necessarily need to be transparent, a transparent one is selected and used as the base material 6 of the invisible individual information pasting label that does not peel off after application.
[0035]
Specific plastic films constituting the transparent substrate 6 and the support sheet 9 include polyesters such as polyvinyl chloride, polyvinyl alcohol, polysulfone, and polyethylene terephthalate, polyarylate, polycarbonate, polyamide, polyimide, cellulose diacetate, and cellulose. A material made of plastic such as triacetate, polystyrene, acrylic, polypropylene, polyethylene, or polyolefin vinyl alcohol can be used.
[0036]
Further, in the case of the support sheet 9 that does not need to be transparent, a metal foil such as aluminum or copper, paper, and impregnated paper such as resin or latex alone, or any composite thereof including plastic A body sheet can also be used.
[0037]
The thickness of the transparent substrate 6 and the support sheet 9 varies depending on the material, but in the case of a biaxially stretched polyester resin film, it is preferably about 5 μm to 250 μm, and is suitable for processing suitability, tensile strength, and thermal transfer. In consideration of thermal efficiency, the thickness is more preferably 10 to 50 μm.
[0038]
On the lower surface of the support sheet 9, the layer to be transferred and the layer to be separated by peeling are appropriately bonded to the support sheet 9 until transfer or peeling, and peeled to enable smooth peeling at the time of transfer. Layer 10 may be stacked.
[0039]
For example, the release layer 10 is obtained by adding a wax, a silicone resin, or the like to a resin having adhesiveness to a transparent base film such as a polyester resin.
Specifically, the release layer 7 was selected from an acrylic skeleton resin such as an acrylic resin, a vinyl chloride / vinyl acetate copolymer, a mixture of cellulose acetate and a thermosetting acrylic resin, a melamine resin, or a nitrocellulose resin. It is comprised from resin and the resin composition which mix | blended polyethylene wax, wax, or silicone resin as an additive as needed. A polyester resin can be added to the resin in order to adjust the peel force, in particular to increase the peel force.
[0040]
These resins and additives are dissolved or dispersed together with an appropriate solvent and applied as a release layer forming ink composition or coating composition by a known printing means or coating means, and dried and solidified. The release layer 7 can be formed, and the dry thickness is 0.1 to 10 μm.
[0041]
In a broad sense, the hologram forming layer 3 is a layer in which a light diffraction structure is formed on a synthetic resin layer, and a typical light diffraction structure is a hologram.
As a hologram, both a plane hologram and a volume hologram can be used. Specific examples include a relief hologram, a Lippmann hologram, a Furnell hologram, a Fraunhofer hologram, a lensless Fourier transform hologram, a laser reproduction hologram (such as an image hologram), and a white light reproduction hologram. (Rainbow hologram, etc.), color hologram, computer hologram, hologram display, multiplex hologram, holographic stereogram, holographic diffraction grating and the like. In addition to the method using the hologram recording method, the diffraction grating may be formed directly by mechanical cutting or by an electron beam or laser light.
[0042]
Synthetic resins constituting the hologram forming layer 3 include polyvinyl chloride, acrylic resins (eg, PMMA), thermoplastic resins such as polystyrene and polycarbonate, unsaturated polyester, melamine, epoxy, polyester (meth) acrylate, urethane (meta ) Acrylates, epoxy (meth) acrylates, polyether (meth) acrylates, polyol (meth) acrylates, melamine (meth) acrylates, triazine acrylates, etc., either alone or with the above thermoplastic resins. It can be used by mixing with a resin. Furthermore, it is a thermoformable substance having a radically polymerizable unsaturated group, or a radically polymerizable unsaturated monomer added thereto to make it ionizing radiation curable. Can be used.
[0043]
In addition, photosensitive materials such as silver salt, dichromated gelatin, thermoplastic, diazo photosensitive material, photoresist, ferroelectric, photochromic material, thermochromic material, chalcogen glass, and the like can also be used.
[0044]
In addition, if the hologram forming layer 3 is composed of a layer whose strength is weak, and if the hologram portion 6 is intended to be peeled off, the hologram forming layer 3 may be destroyed so that the hologram forming layer 3 is peeled off from the adherend. There is an effect that makes it impossible to do.
[0045]
The hologram can be formed on the resin layer by a conventionally known method using the material described above. In the case of recording hologram interference fringes as a relief with surface irregularities, an original plate on which the interference fringes are recorded in an irregular shape is used as a press die, and appropriate means such as a heating roll is formed by overlapping the original plate on the resin layer. Thus, the concavo-convex pattern of the original plate can be duplicated by thermocompression bonding the two. Moreover, when using a photopolymer, after coating a photopolymer similarly on the protective layer of the said lamination sheet, it can duplicate by irradiating a laser beam, overlapping the said original plate.
In forming the hologram, it is preferable to use a layer obtained by laminating the above resin layer on the transparent substrate 6 or the peelable surface of the peelable sheet.
[0046]
As described above, the method of recording the interference fringes on the surface of the hologram forming layer 3 as the relief of the surface irregularities is particularly preferable because it has mass productivity and can reduce the cost. The film thickness of the hologram forming layer 3 is preferably in the range of 0.1 to 6 μm, and more preferably in the range of 1 to 4 μm.
[0047]
The reflection layer 2 is formed adjacent to the hologram forming layer 3. In the case of a relief hologram, the reflection layer 2 is formed on the relief surface and is made of a metal thin film such as aluminum that reflects light.
Metal thin films include aluminum, Cr, Fe, Co, Ni, Pd, Cu, Ag, Au, Ge, Mg, Sb, Pb, Cd, Bi, Sn, Se, TI, Fe, Te, Zn, In , Ga, or Rb, etc., an oxide, a nitride, or an alloy made of a combination of these metals. Of these, Al, Cr, Ni, Ag, or Au is particularly preferable.
[0048]
The reflective layer 2 made of a metal thin film is formed by a thin film forming method such as vacuum deposition, sputtering, or ion plating.
The thickness of the reflective layer 2 may be set appropriately depending on the color tone, design, application, etc., but generally it is preferably in the range of 50 mm to 1 μm, more preferably 100 to 1000 mm. In order to ensure the transparency of the reflective layer 62, the film thickness is preferably 200 mm or less. When it is desired to provide the reflective layer 62 having a concealing property, it is desirable that the film thickness be 200 mm or more. As described above, the thin film can be set according to needs such as color tone, concealment property or transparency in consideration of the use of the transfer foil and the total design.
[0049]
Examples of the material of the reflective layer 2 include a continuous thin film made of a material having a refractive index different from that of the hologram forming layer 3. Although the film thickness of a continuous thin film should just be a transparent area | region of the material which forms a thin film, 100-1000 kg is preferable normally. Examples of a method for forming a continuous thin film on the relief surface include thin film forming methods such as vacuum deposition, sputtering, and ion plating. The continuous thin film may have a refractive index larger or smaller than that of the light diffraction structure layer, but the difference in refractive index is preferably 0.3 or more, and the difference is 0.5 or more, more preferably 1.0 or more. It is more preferable.
[0050]
As a continuous thin film having a refractive index larger than that of the hologram forming layer 3, ZnS, TiO ₂ , Al ₂ O _Three , Sb ₂ S _Three , SiO, TiO, SiO ₂ Etc. As a continuous thin film having a refractive index smaller than that of the hologram forming layer 61, LiF, MgF ₂ , AlF _Three Etc. Further, when the thickness is 200 mm or less, the light transmittance is relatively small, so that it can be used as the reflective layer 2 while being transparent. Further, a transparent synthetic resin having a refractive index different from that of the hologram forming layer 3, for example, a layer of polytetrafluoroethylene, polychlorotrifluoroethylene, polyvinyl acetate, polyethylene, polypropylene, or polymethyl methacrylate is used for the reflective layer 2. You can also.
[0051]
Examples of the adhesive layer 7 include an acrylic resin, an acrylate resin, or a copolymer thereof, a styrene-butadiene copolymer, natural rubber, casein, gelatin, a rosin ester, a terpene resin, a phenol resin, and a styrene resin. Resin, coumarone indene resin, polyvinyl ether, silicone resin and the like are exemplified, and α-cyanoacrylate-based, silicone-based, maleimide-based, styrene-based, polyolefin-based, resorcinol-based, polyvinyl ether-based, silicone-based adhesives, etc. Etc.
[0052]
In addition to the above, a heat sealant (a heat-sensitive adhesive) can also be used because it exhibits tackiness upon heating. For example, ethylene-vinyl acetate copolymer resin, polyamide resin, polyester resin, polyethylene resin, ethylene-isobutyl acrylate copolymer resin, butyral resin, polyvinyl acetate and its copolymer resin, cellulose derivative, polymethyl methacrylate resin, Polyvinyl ether resin, polyurethane resin, polycarbonate resin, polypropylene resin, epoxy resin, or phenol resin can be used. Alternatively, a thermoplastic elastomer such as SBS (styrene-butadiene-styrene block copolymer), SIS (styrene-isoprene-styrene block copolymer), SEBS (styrene-ethylene-butylene-styrene block copolymer), or a reactive hot melt resin is used. May be used.
The thickness of the pressure-sensitive adhesive layer 7 is preferably 3 μm to 20 μm.
[0053]
In addition to the above layers, several layers can be added to the label and transfer sheet using the invisible individual information recording material 1 of the present invention.
In the invisible individual information pasting label 5 in FIG. 2, an intermediate layer made of an appropriate resin may be interposed between the transparent substrate 6 and the hologram forming layer 3. An anchor layer may be interposed therebetween. The same applies when the pressure-sensitive adhesive layer is a heat-sensitive adhesive layer.
The brittle label 8 or transfer sheet of FIGS. 3 and 4 also has an intermediate layer between the release layer 10 and the hologram forming layer 3 and an anchor between the reflective layer 2 and the pressure-sensitive adhesive layer 7 (or heat-sensitive adhesive layer). A layer may intervene.
[0054]
The formation of the invisible pattern on the invisible individual information recording material 1 is preferably performed by laser light irradiation. The pattern to be formed is preferably invisible individual information composed of invisible patterns as described above, but some or all of them may have a regular arrangement of halftone dots and lines. Good.
Use of laser light is suitable for forming individual information because it is easy to write to the reflective layer at high speed based on input information. Conventionally, there is an example in which visible information is recorded by a laser, but since there is a possibility of being counterfeited using a commercially available laser marker, the significance of forming invisible individual information is high.
[0055]
As the laser light, either continuous light or pulsed light can be used. The continuous laser beam always maintains the same output for a fixed time, and the pulsed light can obtain a high output only for a very short time.
[0056]
In order to obtain pulsed laser light, the output of CW laser light (continuous light) is controlled by an external modulator, and examples thereof include an argon laser, a He—Ne laser, a YAG laser, and a semiconductor laser.
In addition, to obtain pulsed laser light, a Q switch can be inserted into the laser oscillator and the energy stored in the laser medium can be output instantaneously by switching the Q switch. By inserting a mechanical shutter, A / O modulation element, or E / O modulation element as a Q switch and controlling the Q value of the resonator, a pulse with a time width of several tens to several hundreds of nanoseconds Light can be generated.
[0057]
The formation of the invisible pattern is performed on the reflective layer 2 accompanied by the hologram forming layer 3 and occurs when the portion of the reflective layer 2 irradiated with the laser beam is melted and removed or evaporated. Laser light irradiation is performed so that the microscopic areas formed by the collection of microscopic holes or the portion irradiated with laser light have different light reflectivity from the surroundings are arranged in a desired pattern with a predetermined density. Do.
It is preferable that one or several of these fine holes or fine areas are gathered to form halftone dots or lines, and these halftone dots or lines constitute a pattern.
[0058]
As a discriminating tool capable of forming a moire pattern by overlapping the invisible information recording material 1 of the present invention and a pattern formed on a label, a transfer sheet or the like using the invisible information recording material 1, an appropriate transparent sheet such as glass or plastic film is used. It is preferable to use those formed with a predetermined pattern by various methods.
[0059]
As a method of forming the pattern of the discriminating tool, in addition to the printing method, a method of forming interference fringes as irregularities on the resin layer by a technique similar to that of a hologram, or electron beam exposure to a resist on a substrate based on information of a computer hologram In addition, a method by duplication from a hologram prototype obtained by development can be used, and these methods may be appropriately combined.
[0060]
The method for forming a pattern on the discriminator described above can be used as a method for forming a pattern on the invisible information recording material 1 of the present invention and a label or transfer sheet using the same.
In these methods other than the method using laser irradiation, it is impossible to record individual information efficiently, but it can be used to form a pattern of common information (= fixed information).
[0061]
The invisible individual information recording material 1 of the present invention, and a label and transfer sheet using the same may have patterns other than those described above.
[0062]
First, the invisible individual information recording material 1 of the present invention has a hologram forming layer, and generally speaking, the hologram is formed by very fine irregularities corresponding to interference fringes. The invisible pattern and / or confirmation pattern described above may be formed therein. These invisible patterns and confirmation patterns are preferably common information rather than individual information.
Of course, an invisible pattern and / or a confirmation pattern as common information may be formed on the reflective layer.
[0063]
The invisible individual information recording material 1 of the present invention may be formed with an invisible pattern and / or a confirmation pattern by printing. These invisible patterns and confirmation patterns are preferably common information rather than individual information.
[0064]
FIG. 9 shows a state in which the invisible individual information pasting label 5 of the present invention is pasted on the back side of the wristwatch. As shown in FIG. 9A, the label 5 uses a mask at the time of hologram formation. Formed as above, “ABCD” as the manufacturer name 34 as common information, and “A1234” as the manufacturing number 35.
FIG. 9B shows a state in which the confirmation pattern sheet 22 ′ is superimposed on the label 5. In addition to the manufacturer name 34 and the production number 35 as common information, “X9876” is further provided as the moire pattern 23. Is visible. Here, it is assumed that the moire pattern 23 is an individual number for each wristwatch.
[0065]
As can be seen from this example, “ABCD” of the manufacturer name 34 and “A1234” of the manufacturing number 35 can be visually recognized by anyone, so those who have unjust intentions should be aware of this point as well. is there.
However, even if the hologram including the manufacturer name 34 and the manufacturing number 35 can be forged, the moire pattern 23 does not occur when the confirmation pattern is held over, so that it can be immediately determined that the hologram has been forged. .
If the label 5 is peeled off and attached to the back side of a fake wristwatch, the label 5 itself is genuine, regardless of the intention, but the relationship between the individual number displayed by the moire pattern and each wristwatch. Can be verified by the correspondence of the number or the like stamped inside the machine, it can be determined that it is a fake.
[0066]
Application of the invisible individual information recording material 1 of the present invention, and a label and a transfer sheet using the same can be performed using articles of various genres as exemplified below.
[0067]
ID (identity verification) cards, such as bank savings and savings cards, credit cards, ID cards (student ID cards or employee ID cards), examination cards for IDs, passports, etc. that are not in card format.
Banknotes, gift certificates, stock certificates, or cash vouchers such as securities.
Driver's license, card-type certificate, for example, various certificates such as fire safety, disinfection or fire safety, hygiene qualifications, or grades.
Lottery tickets, horse races, bicycle races etc. Winning voting tickets, car tickets, etc.
High-priced products such as luxury watches, jewelry, precious metals, antiques, etc., world-renowned luxury products called so-called branded products, or packaging containers such as boxes, cases or bags for storing them.
A copy of music software, video software, computer software, or game software stored in a magnetic recording medium or optical recording medium, a box for storing them, or a packaging container such as a case .
[0068]
【The invention's effect】
According to the first aspect of the present invention, the hologram has a characteristic appearance and difficulty in manufacturing, and individual invisible information is formed as an invisible pattern by laser irradiation or the like with the hologram reflection layer as a recording target. Therefore, the information is not visible in the normal state, but can be seen by the moire generated between the confirmation pattern, so even if the appearance is faithfully reproduced, it is easily determined that it is illegal. It is possible to provide an invisible individual information recording material that is difficult to separate from the hologram and is difficult to analyze invisible information. . Contract According to the third aspect of the invention, the invisible individual information recording material of the first or second aspect of the invention has a structure with a transparent base material on the upper surface and an adhesive layer on the lower surface. It is possible to provide a label for sticking invisible individual information that is easy to apply to. According to the invention of claim 4, since the invisible individual information recording material of the invention of claim 1 or 2 has a structure with a transparent base material on the upper surface and a heat-sensitive adhesive layer on the lower surface, It is possible to provide a label for applying invisible individual information that can be easily applied to a body by hot pressing or the like. According to the invention of claim 5, since the invisible individual information recording material of the invention of claim 1 or 2 has a structure with a peelable support sheet on the upper surface and an adhesive layer on the lower surface, A brittle label for applying invisible individual information can be provided, which is easy to apply to an adherend, and is likely to be destroyed when applied and peeled off after application. According to the invention of claim 6, since the invisible individual information recording material of the invention of claim 1 or claim 2 has a structure with a peelable support sheet on the upper surface and a heat-sensitive adhesive layer on the lower surface, Providing an invisible individual information transfer sheet that is easy to apply to adherends and is reinforced by the lowest heat-sensitive adhesive layer even if it is peeled off after application and can be firmly adhered can do.
[Brief description of the drawings]
FIG. 1 is a view showing an invisible individual information recording material of the present invention.
FIG. 2 is a diagram showing a label for pasting invisible individual information according to the present invention.
FIG. 3 is a diagram showing a brittle label for applying invisible individual information according to the present invention.
FIG. 4 is a view showing an invisible individual information transfer sheet of the present invention.
FIG. 5 is a diagram showing an invisible pattern and a confirmation pattern.
FIG. 6 is a diagram of a moire pattern resulting from an invisible pattern and a confirmation pattern.
FIG. 7 is a diagram showing an invisible pattern composed of halftone dots, a confirmation pattern composed of lines, and a moire pattern.
FIG. 8 is a diagram showing an example in which the direction of the confirmation line is changed.
FIG. 9 is a diagram showing an application example of a label for pasting invisible individual information to a wristwatch.
[Explanation of symbols]
1 Invisible individual information recording material
2 Reflective layer
3 Hologram formation layer
4 Invisible individual information
5 Labels for pasting invisible individual information
6 Transparent substrate
7 Adhesive layer or heat-sensitive adhesive layer
8 Brittle labels for attaching invisible individual information
9 Support sheet
10 Release layer
11 Invisible individual information transfer sheet
21, 31 Invisible pattern
22, 32 Confirmation pattern
23, 33 Moire pattern

Claims (6)

At least a hologram forming layer and a reflective layer are laminated, and the reflective layer is composed of a set of halftone dots, symbols, and characters having different reflectivities from the micropores or the surroundings, and is a separate discrimination tool Alternatively, the invisible individual information recording material is characterized in that invisible individual information is formed by an invisible pattern that can form a moire pattern when superimposed on a confirmation pattern constituted by a line . The invisible individual information recording material according to claim 1, wherein different moiré patterns can be formed when the confirmation pattern is superimposed on the invisible pattern at different angles. The hologram forming layer of the invisible individual information recording material according to claim 1 or 2 is laminated on a lower surface of the transparent substrate sheet so as to face the transparent substrate, and further, the invisible individual information recording material A label for sticking invisible individual information, wherein an adhesive layer is laminated on the lower surface of the reflective layer. The hologram forming layer of the invisible individual information recording material according to claim 1 or 2 is laminated on a lower surface of the transparent substrate sheet so as to face the transparent substrate, and further, the invisible individual information recording material A label for sticking invisible individual information, wherein a heat-sensitive adhesive layer is laminated on the lower surface of the reflective layer. The hologram forming layer of the invisible individual information recording material according to claim 1 or 2 is laminated on the peelable surface of the bottom surface of the peelable support sheet so as to face the support sheet, and A brittle label for sticking invisible individual information, wherein an adhesive layer is laminated on the lower surface of the reflective layer of the invisible individual information recording material. The said hologram formation layer of the said invisible individual information recording material of Claim 1 or Claim 2 is laminated | stacked on the peelable surface of the lower surface of a support sheet toward the said support sheet side, Furthermore, the said invisible individual An invisible individual information transfer sheet, wherein a heat-sensitive adhesive layer is laminated on the lower surface of the reflective layer of the information recording material.

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