JP4620280B2 - Authenticable card - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a card, and an invisible pattern that cannot be judged by the naked eye and a confirmation pattern for confirming this are superimposed via an oversheet that is transparent adhesive, and both patterns produce a visible moire pattern. Thus, the authenticity can be easily confirmed, and the card has a pattern that is difficult to forge.
[0002]
[Prior art]
Articles that have direct or indirect economic or other value shall be made as if they were forged by manufacturing counterfeit products that are similar in appearance to improper intentions, or those that are genuine or used and should be disposed of. It is easy to be remodeled for use.
[0003]
There are several types of articles that are subject to counterfeiting and alteration, such as deposits and savings cards, credit cards and other cards that generate monetary value, banknotes, securities, Those that have a value stated on the face value, such as gift certificates such as gift certificates, stock certificates, lottery tickets, or betting tickets, etc. that have a value determined by factors such as speculative or accidental, as well as passports or identification cards There is no direct monetary value, but there are various types, such as those that guarantee the qualifications and actions of the owner.
High-priced watches and high-priced products such as so-called brand products are also subject to forgery and alteration.
[0004]
Conventionally, various measures have been taken to prevent forgery and alteration of these articles. However, stickers having holograms are often applied to cards, cash vouchers, expensive products, and the like.
Holograms are not universally used in the manufacturing process for obtaining them, such as technology that handles laser light, technology that handles photosensitive resin, and technology that manufactures a replication mold 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 sophisticated and expresses a three-dimensional effect.
[0005]
However, even though the hologram manufacturing process is technically advanced, it can be counterfeited with the acquisition of the technique, and therefore efforts are made to make the hologram replication more difficult.
For example, Japanese Patent Application Laid-Open No. 11-277962 discloses an image forming body that includes a hologram forming layer and a hidden pattern forming layer in which a hidden pattern is formed of halftone dots or lines. As a confirmation means, the hidden pattern can be made visible by superimposing a separate confirmation pattern composed of halftone dots or lines from the image forming body.
[0006]
However, according to the above prior art, the hologram itself is common, and if the hologram and the hidden pattern attached to other similar articles are peeled together, it can be easily transferred and only the hologram can be separated. For example, it is possible to reproduce the hidden pattern on the hologram by analyzing the hidden pattern. Therefore, even if the hidden pattern is confirmed by the confirmation pattern, it is unknown whether the hologram is properly attached.
Alternatively, it is possible to obtain only a confirmation pattern and create a hologram with a hidden pattern that produces a moiré pattern, which is not necessarily a genuine product, but to assume authenticity. Unless it is matched with the pattern, it cannot be judged.
Also, if you happen to handle an article with a hologram on it, you can confirm the authenticity by seeing the hologram if the person who obtained the article does not know that the confirmation pattern should be checked. There is also a risk of misunderstanding.
Therefore, there is a further desire for a method capable of independently confirming the authenticity of each hologram.
[0007]
[Problems to be solved by the invention]
Therefore, in the present invention, in the above prior art, it was difficult to confirm that the hologram separated from the legitimate article was diverted, the hidden pattern was separable, analyzed and copied. To confirm the authenticity without being aware of the presence of the hidden pattern, avoiding misidentification of authenticity only by the presence of the hologram, and without comparing with the reference moire pattern. The challenge is to make it possible.
[0008]
[Means for solving the problems]
In the above prior art, the hidden pattern is formed on a layer different from the hologram forming layer. However, in the present invention, the problem can be solved by forming the hidden pattern directly on the hologram forming layer. did it.
[0009]
In the first invention, at least one of both the invisible pattern and the confirmation pattern that interferes with the invisible pattern to generate a visible moire pattern is a hologram pattern, and at least from the core sheet and the oversheet laminated thereon One of the two patterns is formed between the core sheet and the oversheet, and the other of the two patterns on the oversheet above the one pattern. TheHaveAuthenticity distinguishable cardBecauseAt least, the hologram pattern is provided on the oversheet.The SecondAccording to the present invention, in the first invention, the both patterns are the hologram patterns.. ThirdThe invention of the firstOr secondIn any one of the inventions, the confirmation pattern is provided between the core sheet and the oversheet, and the invisible pattern is provided on the oversheet.The
[0010]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described below with reference to the drawings.
As shown to Fig.1 (a), the base material of the card | curd 1 of this invention consists of a four-layered laminated body of the oversheet 3a, the core sheet 2a, the core sheet 2b, and the oversheet 3b from the lower side, for example It is.
The four-layer laminate is for processing reasons such as the thickness of available sheets and printing, and if the circumstances allow, one core sheet may be used. Moreover, it is not always necessary to cover the front and back with two oversheets, and one oversheet can be omitted. Therefore, the minimum structure of the base material of the card 1 is one in which one oversheet is laminated on one core sheet.
Further, the printed layer 4 is formed on the lower surface of the core sheet 2a, and this printed layer may be formed on the upper surface of the core sheet 2b, or formed on the outer surface or inner surface of the upper and lower oversheets. May be. Further, the magnetic recording layer 5 is normally embedded on the oversheet 3b.
[0011]
In the example shown in FIG. 1A, the card 1 has an invisible pattern 6 made of a hologram pattern between an upper core sheet 2b and an oversheet 2b laminated thereon. On the upper oversheet 2b, there is a confirmation pattern 7 made of printed pattern adhesion. Here, the invisible pattern cannot be discriminated as a pattern when viewed with the naked eye under normal conditions, but physically refers to a pattern that is formed and is also referred to as a hidden pattern.
In the example of FIG. 1A, it is assumed that the hologram layer and the print pattern layer have the same shape and size.
[0012]
FIG. 1B is a plan view of the card 1 of FIG. 1A as viewed from above. The card 1 has characters such as a card name and a card number, and a picture not shown here. They are formed by printing or embossing. Further, the magnetic recording layer 5 is provided along the long side of the card.
[0013]
The lower right corner of the card 1 has a hologram layer 9 as an invisible pattern and a confirmation pattern as a print pattern layer. In the plan view, since both patterns overlap, in FIG. 1B, the same outer shape is shown as the hologram layer 9 and the confirmation pattern 7 for convenience.
The hologram layer 9 normally has a normal hologram pattern in addition to the invisible pattern. In the example of FIG. 1B, what is indicated by several star shapes is a normal hologram picture. The normal holographic pattern can be seen through the confirmation pattern, and in addition to this, the moiré pattern 8 composed of the character string “ABCD” generated by the invisible pattern of the hologram layer 9 interfering with the confirmation pattern 7 is seen. be able to.
The “hologram layer as an invisible pattern” has a hologram pattern and also has an invisible pattern unless otherwise specified.
[0014]
In the card 1 of the example shown in FIG. 2, the invisible pattern 6 made of a hologram pattern is provided between the upper core sheet 2b and the oversheet 3b laminated thereon, the same as the previous example, The difference is that a confirmation pattern 7 made of a hologram pattern is provided on the oversheet 3b above the invisible pattern 6, and the other points are the same as the card 1 of the example shown in FIG.
Thus, even if the confirmation pattern is a hologram pattern, it is possible to see a moire pattern generated by interference with the invisible pattern of the hologram layer on the lower side. However, when the confirmation pattern is a printed pattern layer as in the example of FIG. 1, the contrast of the moire pattern is slightly higher.
[0015]
The card 1 of the example shown in FIG. 3 is basically the same as the card 1 shown in FIG. 2, but the confirmation pattern 7 made of a hologram pattern has an area smaller than the invisible pattern 6 made of a hologram pattern on the lower side. The difference is that the card 1 extends over the entire surface.
In this case, a picture using the entire surface of the card 1 is formed on the upper hologram pattern, so that the location where the confirmation pattern exists is difficult to understand, which is advantageous in terms of preventing counterfeiting.
[0016]
In any of the cards 1 shown in FIGS. 1 to 3, the pattern on the upper side (= observer side) is the confirmation pattern, and the pattern on the lower side (= inner side) is the invisible pattern. Alternatively, the upper pattern may be an invisible pattern, and the lower pattern may be a confirmation pattern.
In any case, the moire pattern is generated in the same manner, but the moire pattern is slightly more visible when the confirmation pattern is on the upper side than when it is on the lower side. Also, in terms of preventing theft of cards in the middle of manufacturing, the confirmation pattern is more regular and easier to forge, so the invisible pattern is not formed on the lower side and the upper confirmation pattern is not formed. A semi-finished product that forms a confirmation pattern on the lower side and does not form an upper invisible pattern is superior to the product in terms of safety in storage.
[0017]
In the above description, either the upper or lower pattern is an invisible pattern and the remaining pattern is a confirmation pattern. However, as shown in FIG. 4, both the upper and lower patterns are divided ( The upper side of the position where the lower side is the invisible pattern is a confirmation pattern, and the upper side of the position where the lower side is the confirmation pattern is an invisible pattern. Accordingly, the invisible pattern and the confirmation pattern can be mixed in the same layer as long as the correspondence between the invisible pattern and the confirmation pattern on the upper side and the lower side can be obtained.
[0018]
In addition, it is desirable that one of the upper and lower patterns is a hologram pattern. The reason is that although the hologram is precisely formed, the presence of an invisible pattern is difficult to understand because the contrast of the image is less than that of dark printing. In addition, since a normal hologram image can be seen, the appearance can be improved.
[0019]
When either of the upper and lower patterns is a hologram pattern, it is more preferable that the lower pattern is a hologram pattern. The reason is that if the hologram pattern exists on the lower side, that is, between the core sheet and the oversheet, it is difficult to separate the hologram alone.
[0020]
When the lower pattern is a hologram pattern, the upper pattern may be a hologram pattern or may not be a hologram. When the upper pattern is a hologram, the contrast of the moire pattern is lower than when the upper pattern is not a hologram pattern, but there is an advantage that forgery is more difficult, so the upper pattern is not a hologram pattern. In some cases, the contrast of the moire pattern is increased.
[0021]
In general holograms, as will be described later, the reflective layer is transparent and the whole is transparent and the other side is transparent, and the reflective layer is a metal thin film or the like and is opaque, and the whole is opaque. There are two types. There is also a transparent type hologram without a reflective layer.
In the present invention, any one of the invisible pattern and the confirmation pattern is a hologram pattern, regardless of whether it is on the upper side or the lower side. However, if the hologram pattern is on the upper side, it must be transparent. Therefore, the invisible pattern and the confirmation pattern are defined as “the invisible pattern and the confirmation pattern that interferes with the invisible pattern to generate a visible moire pattern” and are defined as those that interfere with each other to generate the visible moire pattern. Thus, when there is a hologram pattern on the upper side, the hologram pattern is excluded from being opaque.
[0022]
Here, the invisible pattern and the confirmation pattern will be described next.
FIG. 5A is a diagram illustrating the invisible pattern 11, and the invisible pattern 11 includes a horizontally long rectangular pattern portion 11a at the center, a frame-shaped pattern portion 11b in contact with the four circumferences of the pattern portion 11a, and It consists of three parts of the background part 11c, and all of the three parts are composed of lines. Among these three portions, the pattern portion 11a and the pattern portion 11b are configured by the same upwardly rising lines, except that the lines are shifted by 1/2 pitch in both pattern portions. The remaining background portion 11c 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.
[0023]
FIG. 5B illustrates a confirmation pattern 12 for confirming the invisible pattern 11 shown in FIG. 5A. The confirmation pattern 12 is composed of a line that rises to the right. The pitch and direction (angle) are the same as the lines constituting the central part of the invisible pattern 11 and the pattern parts 11a and 11b surrounding the periphery of the invisible pattern 11 described with reference to FIG. The lines have the same pitch but the directions are orthogonal to each other.
[0024]
FIG. 6 shows a state where the invisible pattern 11 and the confirmation pattern 12 in the above example are overlapped.
When the confirmation pattern 12 shown in FIG. 5B is overlaid on the invisible pattern 11 shown in FIG. 5A, the lines constituting the confirmation pattern 12 form the pattern portion 11 a in the center of the invisible pattern 11. As shown in FIG. 6A, the central pattern portion 11a looks just like the original line state, but is not a line in the surrounding frame-shaped pattern portion 11b, as shown in FIG. 6A. Since the part is filled with lines of the confirmation pattern 12, as a result, the part of the frame-like pattern part 11b appears to be filled (indicated by the reference numeral of the moire pattern 13 in FIG. 6A).
[0025]
Further, the invisible pattern 11 and the confirmation pattern 12 are relatively shifted from the above state in which the confirmation pattern 12 is superimposed on the invisible pattern 11, and the lines constituting the confirmation pattern 12 are frame-shaped patterns of the invisible pattern 11. If it is made to just overlap on the line which comprises the part 11b, as shown in FIG.6 (b), the frame-shaped pattern part 11b will look like the state of the original line, but the pattern part 11a of a center part is shown. Since the lines that are not lines are filled with the lines of the confirmation pattern 12, the central pattern portion 11 a appears to be filled (indicated by reference numeral of the moire pattern 13 in FIG. 6B). ).
That is, in the central pattern portion 11a and the surrounding frame-shaped pattern portion 11b, the lines constituting each are shifted by ½ pitch. Thus, the positional relationship with the confirmation pattern 12 is shifted. However, there is an advantage that any one of the pattern portions is filled.
[0026]
The portions other than the pattern portions 11a and 11b of the invisible pattern 11, that is, the background portion 11c of the invisible pattern, appear to be uniform because the state where the lines are orthogonal to each other does not change in any of the above cases.
[0027]
In FIG. 5A, since the invisible pattern 11 is illustrated in an enlarged manner, both the pattern portions 11a and 11b surrounding the center portion and the periphery thereof seem to be distinguished from the background portion 11c. In practice, however, the line width and pitch of each line are small, and both the pattern portions 11a and 11b and the background portion 11c have the same proportion of the line portion in the unit area (FIG. 5A). In this example, it is 50% in any place.) Since no difference in density occurs, it is very difficult to visually determine the invisible pattern 11.
[0028]
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.
[0029]
As shown in the above example, by overlaying the confirmation pattern 12 on the invisible pattern 11, the pattern portions 11a and 11b have a line portion ratio of 50% or 100%. A difference from the line ratio of 75% is generated, and visual recognition is possible.
[0030]
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.
[0031]
Each of the invisible patterns 21 is composed of halftone dots having a square outer shape. In the figure, the grid lines made up of thin vertical lines and thin horizontal lines have the positions of the halftone dots shifted from the grid arrangement. This is an auxiliary line for indicating The lattice lines are equally spaced in the vertical and horizontal directions, and the vertical lines and the horizontal lines are orthogonal to each other.
[0032]
First, regarding the arrangement of the halftone dots in the left-right direction (in the x-y coordinate, the x-axis direction), the halftone dots in the leftmost column (first column) of the invisible pattern 21 are all. At the upper right of each grid point, therefore, the left side and the lower side of the quadrangle of each 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 horizontal 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.
[0033]
For the invisible pattern shown in FIG. 7A, the confirmation pattern 22 that can confirm the invisible pattern 21 is one in which each line is arranged in the x-axis direction (FIG. 7B), or each line is y. There are two types arranged in the axial direction (FIG. 8 (b)), and they are in a relationship in which the other is rotated by 90 °.
All the confirmation patterns are composed of lines, and the width of each line is formed to be equal to one side of the halftone dot of the invisible pattern.
[0034]
First, the confirmation pattern 22 shown in FIG. 7B is overlaid on the invisible pattern 21 shown in FIG. Here, it is assumed that the horizontal lines of the grid lines of the invisible pattern 21 are overlapped so that the lower sides of each line of the confirmation pattern 22 are in contact with each other.
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.
[0035]
Further, the confirmation pattern 22 shown in FIG. 8B is overlaid on the invisible pattern 21 shown in FIG. Here, it is assumed that the vertical lines of the lattice lines of the invisible pattern 21 are overlapped so that the left side of each of the lines constituting the confirmation pattern 22 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.
[0036]
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. In addition to the above, a combination of an invisible pattern constituted by halftone dots and a confirmation pattern constituted by halftone dots, and a confirmation pattern constituted by invisible patterns constituted by lines and halftone dots are also possible.
[0037]
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.
[0038]
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.
[0039]
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.
[0040]
A shape having a length several times or more than the line width does not have a halftone dot or a single line. It shall be included in the range of "".
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.
[0041]
The laminated body constituting the base material of the card 1 of the present invention is usually composed of a plastic sheet. Of the laminates, the core sheet is usually a white non-transparent plastic sheet, and the oversheet is usually a colorless and transparent plastic sheet, but is not limited thereto. However, it is desirable that at least the oversheet is transparent regardless of whether it is colored or colorless.
[0042]
As a plastic sheet constituting the above laminate, polyesters such as polyvinyl chloride, polyvinyl alcohol, polysulfone, polyethylene terephthalate, polyarylate, polycarbonate, polyamide, polyimide, cellulose diacetate, cellulose triacetate, polystyrene, acrylic, polypropylene, A material made of plastic such as polyethylene or polyolefin vinyl alcohol can be used.
When heat resistance is required, an amorphous polyester sheet or a blend resin sheet of amorphous polyester and polycarbonate can also be used.
[0043]
The core sheet which does not need to be transparent is made of a metal foil such as aluminum or copper, paper, and impregnated paper such as resin or latex alone, or any composite sheet thereof including plastic. Can be configured.
[0044]
Although the thickness of the laminated body which is the base material of the card | curd 1 changes with materials, it is the range of about 10 micrometers-about 5 mm normally. In particular, in the case of a magnetic card, when the base material 2 conforms to the ISO standard, the thickness is 0.76 mm. In the case of a normal card, a white PVC sheet with a thickness of 280 μm is used as a core sheet, and two of them are stacked, and a transparent PVC sheet with a thickness of 100 μm is stacked as an oversheet on each side and laminated by hot pressing or the like. It is common to use a substrate sheet having a constitution (total thickness 0.76 mm).
The plane size of a general bank card or credit card is about 54 mm × about 86 mm in length and width, but the card 1 of the present invention can have various sizes including such a size.
[0045]
In the present invention, the patterns constituting the invisible pattern and the confirmation pattern have already been described. These patterns are formed on the hologram layer, and are printed on a sheet occupying an appropriate position, or printing-related. It may be formed by technology.
[0046]
The hologram layer is typically composed of a hologram forming layer in which a relief hologram is formed on the lower surface side of the transparent resin layer, and a reflective layer formed along the relief surface. Although a confirmation pattern can be formed, an invisible pattern, a confirmation pattern, or in some cases, a mixture thereof is formed on a hologram forming layer that can be easily replicated in large quantities.
[0047]
In the broad sense, the hologram forming layer in the present invention 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.
[0048]
Synthetic resins constituting the hologram forming layer include polyvinyl chloride, acrylic resins (eg, PMMA), thermoplastic resins such as polystyrene and polycarbonate, unsaturated polyester, melamine, epoxy, polyester (meth) acrylate, urethane (meth). Thermosetting resins such as acrylates, epoxy (meth) acrylates, polyether (meth) acrylates, polyol (meth) acrylates, melamine (meth) acrylates, triazine acrylates, or the above thermoplastic resins and thermosetting resins. In addition, a thermoformable substance having a radically polymerizable unsaturated group, or a radically polymerizable unsaturated monomer added to these to make ionizing radiation curable, etc. Can be used.
[0049]
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.
[0050]
As described above, the method of recording the interference fringes on the surface of the hologram forming layer as the relief of the surface irregularities is particularly preferable in terms of mass productivity and low cost. The film thickness of such a hologram forming layer is preferably in the range of 0.1 to 6 μm, and more preferably in the range of 1 to 4 μm.
[0051]
A normal hologram can be formed on the resin layer by a conventionally known method using the above materials. 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 a transparent substrate or a peelable surface of a peelable sheet.
[0052]
Here, in addition to normal hologram formation, in order to form an invisible pattern or / and a confirmation pattern, a hidden pattern or confirmation pattern was formed prior to or after interference exposure for hologram formation. This can be done by using a film to expose a layer of an ultraviolet curable resin or the like for constituting the hologram forming layer.
Alternatively, interference exposure can be performed through the film, and it can also serve as a hidden pattern or a confirmation pattern.
[0053]
Exposure to the ultraviolet curable resin layer or the like for constituting the hologram forming layer using the film on which the hidden pattern or the confirmation pattern is formed can be performed by electron beam drawing on the electron beam curable resin layer.
In this case, the hidden pattern or confirmation pattern and the hologram are simultaneously formed by performing exposure based on the combined drawing information obtained by combining the drawing information about the hidden pattern or confirmation pattern and the drawing information about the hologram. Can do.
[0054]
A reflection layer is formed adjacent to the hologram forming layer. In the case of a relief hologram, it is typically formed of a metal thin film such as aluminum (Al) that is formed on the relief surface and reflects light.
Other metal thin films include Cr, Fe, Co, Ni, Pd, Cu, Ag, Au, Ge, Mg, Sb, Pb, Cd, Bi, Sn, Se, TI, Fe, Te, Zn, In, It is formed using a metal such as Ga or Rb, 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.
[0055]
The reflective layer made of a metal thin film is formed by a thin film forming method such as a vacuum deposition method, a sputtering method, or an ion plating method.
The thickness of the reflective layer may be set appropriately depending on the color tone, design, application, etc., but generally it is preferably in the range of 50 to 1 μm, more preferably 100 to 1000 mm. In order to ensure the transparency of the reflective layer, the film thickness is preferably 200 mm or less. When it is desired to provide a reflective layer having a concealing property, the film thickness is desirably 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.
[0056]
Examples of the material of the reflective layer include a continuous thin film made of a material having a refractive index different from that of the hologram forming layer. 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. Although the refractive index of the continuous thin film may be larger or smaller than that of the light diffraction structure layer, the refractive index difference is preferably 0.22 or more, and the difference is 0.5 or more, and further 1.0 or more. It is more preferable.
[0057]
As a continuous thin film having a higher refractive index than that of the hologram forming layer, ZnS, TiO₂, Al₂ O₂ , Sb₂ S₂ , SiO, TiO, SiO₂ Etc. As a continuous thin film having a refractive index smaller than that of the hologram forming layer 61, LiF, MgF₂ , AlF₂ Etc. Further, when the thickness is 200 mm or less, the light transmittance is relatively small, so that it can be used as a reflective layer while being transparent. Further, a transparent synthetic resin having a refractive index different from that of the hologram forming layer, for example, a layer of polytetrafluoroethylene, polychlorotrifluoroethylene, polyvinyl acetate, polyethylene, polypropylene, or polymethyl methacrylate may be used for the reflective layer 2. it can.
As the reflective layer, any of the types described above can be used, but a reflective layer made of a metal thin film is more preferable in terms of higher hologram contrast.
[0058]
In the present invention, the invisible pattern and / or the confirmation pattern can be formed by printing performed on a sheet occupying an appropriate position of the card 1 or a printing-related technique.
[0059]
The positions where the invisible pattern and / or the confirmation pattern are to be formed are roughly classified on the oversheet and between the core sheet and the oversheet. In the latter case, the upper surface of the core sheet or the lower surface of the oversheet is the target position.
[0060]
In order to form an invisible pattern or a confirmation pattern, printing or the like, specifically, printing or printing-like means, that is, normal printing methods such as letterpress printing, planographic offset printing, gravure printing, or screen printing Alternatively, printing-like methods such as electrophotography and ink jet can be used. Also, transfer by a thermal printing means such as a thermal head can be used as one of the latter ranges.
Furthermore, it is also possible to form a transfer sheet once by forming a pattern on the surface of a peelable sheet or the like by printing or printing-like means, and transfer using the obtained transfer sheet.
[0061]
As described above, the hologram layer basically includes a hologram forming layer and a reflection layer. To apply the hologram layer to the card 1, a transfer sheet having the hologram layer as a part of the transfer layer, a hologram It is preferable to prepare a label containing the layer as part of the structure and apply it by transfer or sticking.
[0062]
The transfer sheet and label can have the following structure. The symbol “/” is used to mean the lamination of the left and right films or sheets of the symbol.
First, examples of the transfer sheet include a laminated structure of a support sheet / release layer / hologram forming layer / reflection layer / adhesive layer (preferably a heat-sensitive adhesive layer). Here, an intermediate layer can be interposed between the release layer and the hologram forming layer, or an anchor layer can be interposed between the reflective layer and the adhesive layer.
Examples of the label include a laminated structure of a support sheet / hologram forming layer / reflection layer / adhesive layer. Here, an anchor layer can be interposed between the support sheet and the hologram forming layer, and between the reflective layer and the adhesive layer.
[0063]
As a transfer sheet or a support sheet for a label, a plastic film, for example, polyester such as polyvinyl chloride, polyvinyl alcohol, polysulfone, polyethylene terephthalate, polyarylate, polycarbonate, polyamide, polyimide, cellulose diacetate, cellulose triacetate, polystyrene series, Usually, a transparent material made of plastic such as acrylic, polypropylene, polyethylene, or polyolefin vinyl alcohol is used.
As the support sheet of the transfer sheet, a non-transparent metal foil such as aluminum or copper, paper, and impregnated paper such as resin or latex, alone, or any composite sheet thereof including plastic is used. You can also.
[0064]
The thickness of the support sheet 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. In consideration of processability, tensile strength, and thermal efficiency during thermal transfer, 10 to More preferably, it is 50 μm.
[0065]
On the lower surface of the support sheet constituting the transfer sheet, the layer to be transferred and the layer to be peeled and separated are appropriately adhered to the support sheet until transfer or peeling, enabling smooth peeling at the time of transfer. Therefore, a release layer may be laminated.
For example, the release layer is obtained by adding a wax or a silicone resin to a resin having adhesiveness to a transparent substrate film such as a polyester resin.
Specifically, the release layer is a resin 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. And a resin composition containing polyethylene wax, wax, silicone resin, or the like as an additive as required. A polyester resin can be added to the resin in order to adjust the peel force, in particular to increase the peel force.
[0066]
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. A release layer can be formed, and the dry thickness is 0.1 to 10 μm.
[0067]
Examples of the pressure-sensitive adhesive layer include acrylic resins, acrylic ester resins, or copolymers thereof, styrene-butadiene copolymers, natural rubber, casein, gelatin, rosin esters, terpene resins, phenolic resins, and styrene resins. And coumarone indene resin, polyvinyl ether, silicone resin and the like, and α-cyanoacrylate-based, silicone-based, maleimide-based, styrol-based, polyolefin-based, resorcinol-based, polyvinyl ether-based, silicone-based adhesives, etc. Is mentioned.
[0068]
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 or adhesive layer is preferably 2 μm to 20 μm.
[0069]
The card 1 of the present invention is an ID (identity verification) card, for example, a bank saving deposit card, a credit card, an identification card (student ID or employee ID card), but is not in a card format, but an ID card for ID, It is suitable for use in passports, etc., or driver's licenses, card-type certificates, for example, various certificates such as fire protection, disinfection or fire safety, hygiene qualifications or grades.
[0070]
【Example】
Example 1
The card shown in FIG. 1 was produced. The following symbols are the same as those in FIG.
First, for the core sheet, two white polyvinyl chloride resin sheets having a thickness of 0.28 mm manufactured by the calendar method are prepared, and one sheet 2a is printed with characters by offset printing on the back surface, and the other For the sheet 2b, a hologram transfer foil having a hidden pattern is used on the front side surface, using a hot stamp device, temperature: 150 ° C., transfer pressure: 10 kg / cm²Transfer was performed under the conditions of pressurization time; 1 second, and a hologram 6 having a hidden pattern was formed.
[0071]
Separately, for the over sheet, two transparent polyvinyl chloride resin sheets having a thickness of 0.1 mm, which were also produced by the calendar method, were prepared, and a magnetic stripe was transferred to one side of one sheet 3b. A line that is the confirmation pattern 7 was printed by offset printing at a different surface, and the other sheet 3a was left as it was.
[0072]
The sheets prepared and cut as described above are cut into the same size, and from above, each of the sheets 3b, 2b, 2a, and 3a is placed on the sheet 3b, with the surface on which transfer and printing have been performed on the upper side. 2b is overlaid with the surface on which the hologram 6 is formed on the upper side, and the sheet 2a is overlaid with the printed surface on the lower side. The temperature is 150 ° C., the transfer pressure is 25 kg / cm.², Pressurization time: press laminate under the condition of 15 minutes, and after laminating and integrating, a credit card 1 was obtained by punching to a predetermined card size.
[0073]
The obtained credit card 1 is a hidden pattern that cannot be seen by the hologram 6 alone because the confirmation line 7 is formed on the hologram 6 having the hidden pattern via the oversheet 3b. The letters “ABCD” were always observable without requiring any auxiliary means.
[0074]
(Example 2)
The card shown in FIG. 3 was produced. The following symbols are the same as those in FIG.
After the credit card 1 is formed in the same manner as in Example 1 except that the line confirmation pattern is not printed by offset printing, the confirmation pattern 7 is previously provided as a line pattern on the upper oversheet 3b. The transparent hologram was transferred by a hot press method using a transfer sheet having the transparent hologram, whereby a credit card 1 having a transparent hologram on the entire outermost surface was obtained.
[0075]
The obtained credit card 1 has a hidden pattern which is not visible with the hologram 6 alone, because a transparent line is formed as a confirmation pattern 7 on the hologram 6 having the hidden pattern via the oversheet 3b. Although the character “ABCD” is slightly lower in contrast than in the first embodiment, it is always observable without requiring any auxiliary means, and the periphery is covered with a hologram. The appearance was excellent.
[0076]
【The invention's effect】
According to the invention of claim 1, since both the invisible pattern and the confirmation pattern are laminated as a part of the card structure and separated by the oversheet, an attempt is made to separate the portion having the moire pattern. Then, it is necessary to separate the entire oversheet, and separation is difficult. Even if the entire oversheet can be separated, there is a thickness that becomes unnatural when diverted. Since separation is difficult, each analysis is difficult, moire patterns are always visible, so there is no need for operations for discrimination, and there is an advantage that a reference pattern is not required. Can provide distinguishable cardsAlong withSince the hologram pattern is provided on the outer surface of the rubber sheet, it is possible to provide a card with an excellent appearance of the hologram on the outermost surface and capable of discriminating authenticity. Claim2According to the invention, in addition to the effect of the invention of claim 1, since the hologram pattern is also provided inside and outside the card, it is difficult to separate at least the hologram pattern inside and the outside of the card. With this hologram pattern, it is possible to provide a card with an excellent appearance on the outermost surface and capable of distinguishing authenticity. ContractClaim3According to the invention of claim 1,OrClaim2In addition to the effects of the invention, since an invisible pattern is on the oversheet, a rather regular confirmation pattern can be formed inside, and an invisible pattern can be formed as necessary to make a product. Excellent safety when stored without forming the upper pattern,trueA card capable of discriminating the correctness can be provided.
[Brief description of the drawings]
FIG. 1 is a diagram of a card having a confirmation pattern on an invisible pattern of a hologram.
FIG. 2 is a diagram of a card composed of a hologram for both an invisible pattern and a confirmation pattern.
FIG. 3 is a diagram of a card made of a hologram having a confirmation pattern formed on the entire surface.
FIG. 4 is a diagram of a card in which an invisible pattern and a confirmation pattern are mixed.
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.
[Explanation of symbols]
1 card
2 Core sheet
3 Oversheet
4 Print layer
5 Magnetic recording layer
6 Invisible patterns
7 Confirmation pattern
8 Moire patterns
9 Hologram layer
10 Release layer
11, 21 Invisible pattern
12, 22 Confirmation pattern
13, 23 Moire pattern

Claims (3)

At least one of both the invisible pattern and the confirmation pattern that interferes with the invisible pattern to generate a visible moire pattern is a hologram pattern, and the laminate including at least a core sheet and an oversheet laminated thereon, one of the patterns of the both patterns between the core sheet and the over sheet, also authenticity that have a other pattern of said two patterns above the over-sheet of the one pattern Is a distinguishable card ,
A card capable of discriminating authenticity, having at least the hologram pattern on the oversheet . The authenticity distinguishable card according to claim 1, wherein the two patterns are the hologram patterns. 3. The authenticity can be determined according to claim 1, wherein the confirmation pattern is provided between the core sheet and the oversheet, and the invisible pattern is provided on the oversheet. Card.

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