JP2004122566A - Anti-counterfeit card - Google Patents

Abstract

An image forming apparatus includes a latent image forming layer on which an image pattern such as a character or a picture is displayed through a dedicated authenticity determination film, thereby providing a security-resistant forgery prevention measure capable of preventing copying by a copying machine. Provide a forged anti-counterfeit card.
A reflection layer (12) and a latent image forming layer (13) are formed in this order on at least one surface of a sheet-shaped substrate (11) from the side closer to the substrate. The reflective layer was provided by printing ink containing 20 to 40% of aluminum powder. The latent image forming layer is provided with an ink containing a polymer liquid crystal material exhibiting thermotropic property by printing an image pattern such as an arbitrary character or picture. The authenticity determination film 16 is a circularly polarizing film.
[Selection diagram] FIG.

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an information recording medium used for, for example, a cash card, a credit card, an ID card (identification card), a membership card, a prepaid card, and the like. The present invention relates to a forgery prevention card that allows a latent image to be viewed by using a dedicated authenticity determination film.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as magnetic recording media are widely used in fields such as cash cards, credit cards, ID cards, and the like, the risk of misuse by unauthorized counterfeiting has increased. Forgery prevention technology is an important technology in card manufacturing. It has become one of.
Furthermore, in recent years, forgery using a color copier has been conspicuous due to the remarkable progress of the color copier. For this reason, various anti-counterfeiting technologies utilizing the characteristics of color copying machines have been developed.
[0003]
As one of the forgery prevention techniques, there is a method in which a color is copied by printing with an ink having a sharp peak in a spectral reflectance curve to obtain another color.
As another method, a part of a line is provided in such a direction as not to be scanned by a color copier, so that only a part of the line having a different direction when copying is raised, or a halftone dot and a line are used. By combining lines, the method of emphasizing the distinction between halftone dots and lines when copying is performed. Furthermore, the method of providing micro-characters that exceed the resolution of copiers, and the use of special inks such as magnetic inks as part of printing And the like.
[0004]
However, these anti-counterfeiting techniques are becoming ineffective due to advances in color copiers. Alternatively, there is a case where it is effective for a specific color copier but is not applicable to all color copiers. Special inks such as magnetic inks are inconvenient because authenticity cannot be determined unless a measuring device such as a magnetic head is used.
[0005]
[Problems to be solved by the invention]
The present invention has been made in view of the above-described problems.By providing a latent image forming layer on which an image pattern such as a character or a picture is displayed through a dedicated authenticity determination film, copying is performed. An object of the present invention is to provide a forgery prevention card that has a high security forgery prevention measure capable of preventing copying by a machine.
[0006]
[Means for Solving the Problems]
The present invention is a forgery prevention card characterized in that a reflection layer and a latent image forming layer are formed in this order on at least one surface of a sheet-shaped substrate from the side closer to the substrate.
[0007]
Further, the present invention is a forgery prevention card characterized in that a reflection layer, a latent image forming layer, and a protective layer are formed in this order on at least one surface of a sheet-like substrate from the side closer to the substrate. .
[0008]
Further, the present invention is the forgery prevention card according to the above invention, wherein the reflective layer is provided by printing using an ink containing 20 to 40% of aluminum powder.
[0009]
Also, the present invention provides the forgery prevention card according to the present invention, wherein the latent image forming layer is provided by printing an image pattern such as an arbitrary character or picture using an ink containing a polymer liquid crystal material exhibiting thermotropic property. It is a forgery prevention card characterized by the following.
[0010]
Further, in the present invention, in the forgery prevention card according to the above invention, the latent image forming layer uses a polymer liquid crystal material having a thermotropic property, and the polymer pattern is oriented by heating and pressing an image pattern. This is a forgery prevention card characterized by displaying an image pattern when viewed through an authenticity determination film.
[0011]
Further, the present invention is the forgery prevention card according to the above invention, wherein the authenticity determination film is a circularly polarizing film.
[0012]
Further, the present invention is a forgery prevention card according to the above invention, further comprising an information recording means using at least one of an IC module and a magnetic recording layer.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described.
One embodiment of the configuration of the forgery prevention card of the present invention is shown in FIG. FIG. 2 is a plan view showing a latent image that appears when the authenticity determination film is placed on the forgery prevention card of FIG. FIG. 3 is a sectional view taken along line XX in FIG.
FIG. 4 shows another first example of the forgery prevention card of the present invention. FIG. 5 is a plan view showing a latent image that appears when the authenticity determination film is placed on the forgery prevention card of FIG. FIG. 6 is a sectional view taken along line YY in FIG.
[0014]
FIG. 7 shows another second example of the forgery prevention card of the present invention. FIG. 8 is a plan view showing a latent image that appears when the authenticity determination film is placed on the forgery prevention card of FIG. FIG. 9 is a sectional view taken along line ZZ in FIG.
FIG. 10 shows another third example of the forgery prevention card of the present invention. FIG. 11 is a plan view showing a latent image that appears when the authenticity determination film is placed on the surface of the forgery prevention card of FIG. FIG. 12 is a plan view showing a latent image that appears when the authenticity determination film is placed on the back surface of the forgery prevention card of FIG. FIG. 13 is a sectional view taken along the line Z2-Z2 in FIGS.
FIG. 14 is an explanatory view conceptually showing a state of an optical path between layers of the forgery prevention card of the present invention.
[0015]
As shown in FIG. 1, in one embodiment of the forgery prevention card of the present invention, a reflective layer 12 and a latent image forming layer 13 are sequentially provided on one side of a sheet-like base material 11, and an oversheet layer 14 is further provided. It is what is being done.
The base material 11 and the oversheet layers 14 and 15 in the present invention are a vinyl chloride sheet, a polycarbonate sheet, an acrylonitrile butadiene styrene sheet, an amorphous polyester sheet, a paper sheet and the like.
[0016]
The vinyl chloride sheet is a vinyl chloride resin, a vinyl chloride-vinyl acetate copolymer, the polycarbonate sheet is a polycarbonate containing bisphenol A as a main component, and the acrylonitrile butadiene styrene sheet is a polymer alloy with an acryl polyarylate. Yes, the paper sheet is high quality paper, art paper, coated paper, synthetic paper, or the like. The thicknesses of the substrate and the oversheet layer are selected according to the application and can be used as appropriate.
[0017]
In addition, since various physical properties as a card are not sufficient with only the above resins, various fillers and additives can be added to these resins. Examples of the filler to be added include heavy calcium carbonate, light calcium carbonate, natural silica, kaolin, clay, titanium oxide, barium sulfate, zinc oxide, aluminum hydroxide, alumina, and magnesium hydroxide in the amorphous filler. . Examples of the plate-like filler include talc and mica glass flake.
[0018]
Examples of the acicular filler include wollastonite, potassium titanate, basic magnesium sulfate, sepiolite, zonotolite, and aluminum borate.
Among them, titanium oxide or the like is often used as a white pigment to be added to a resin. In addition, talc is often used to improve embossability. By kneading the filler, properties such as rigidity, durability, heat deformation resistance, moldability, impact strength, and dimensional stability can be improved. The above-mentioned fillers can be added alone, but can be added simultaneously in several types. A filler can be selected and used depending on a target property value.
[0019]
The substrate and the oversheet layer in the present invention can be formed into a sheet by an extrusion method and a calendering process.
As a method for manufacturing a card using a card material in the present invention, there is a melt lamination method using a heating press machine. The melt lamination method is a method in which a card material is sandwiched between mirror plates slightly larger than the size of the card material, and then the card material is integrated by a heating press. At this time, a transparent protective sheet is laminated on both sides of the printed base material and lamination is performed, but the types of the protective sheets laminated on both sides may be different. As the mirror surface plate, a nickel-chromium-plated copper plate, a stainless steel plate having a polished surface, an aluminum plate having a polished surface, or the like can be used.
Next, the melt-laminated card material is peeled off from the mirror plate, and the integrated card material is punched into a card shape by punching with a single-edged or male-female mold to obtain a sheet-shaped substrate.
[0020]
For example, a magnetic recording layer may be provided on the substrate in the present invention, and a conventionally used thermal transfer type magnetic tape may be provided on one or both surfaces of the substrate by transfer. Alternatively, the magnetic recording layer can be directly provided on the substrate by printing.
Further, the printing on the base material in the present invention can print characters or pictures by a known printing method such as an offset printing method, a screen printing method, and a gravure printing method.
[0021]
The reflective layer 12 in the present invention can be formed by printing an ink containing 20 to 40% of aluminum powder by using a known printing method such as a screen printing method, an offset printing method, and a roll coating method. This ink is a one-pack type screen ink using a ketone solvent such as cyclohexanone, γ-butyrolactone, isophorone, or an aromatic solvent such as 1,3,5-trimethylbenzene and a vinyl chloride resin as a binder, and a solvent. UV-curable ink or electron beam-curable ink, which is an ink that does not use, can be used.
When the content of the aluminum powder is less than 20%, the concealing is not sufficient, and the aluminum layer does not function as a reflective layer. On the other hand, if it exceeds 20%, the reflective layer becomes brittle and the strength is not sufficient.
[0022]
The ultraviolet-curable ink is composed of a prepolymer, a monomer, and a photopolymerization initiator (sensitizer). The photopolymerization initiator absorbs ultraviolet rays having a specific wavelength, and causes a chain reaction to cure the ink. Resins such as urethane acrylate, epoxy acrylate, and polyester acrylate can be used as the prepolymer, and acrylic monomers, acrylic oligomers, and the like can be used as the monomers.
The electron beam-curable ink is a type of solventless printing ink, and is an ink that is rapidly cured and dried by irradiation with an electron beam having high energy intensity. Since the electron beam has a strong energy permeability to an opaque film and a thick film, it is not necessary to add a sensitizer and a reaction initiator to the ink.
[0023]
The latent image forming layer 13 in the present invention is formed of a polymer liquid crystal material formed in an arbitrary character or picture pattern shape. The polymer liquid crystal material has a melting point of about 80 to 200 ° C. and is preferably a polymer liquid crystal exhibiting thermotropic properties. For example, thermotropic polymers such as polyester copolymers, polyethers, polycarbonates, polyisocyanates, and polyglutamic esters are preferable. Liquid crystalline polymer. The thermotropic polymer liquid crystal can be provided by a known method such as a gravure printing method, a screen printing method, and a nozzle coater method.
This latent image forming layer does not show a specific crystal structure in a normally printed state, and is formed in a random molecular state. The latent image in the present invention exhibits liquid crystallinity by applying a thermal pressure to a polymer liquid crystal material, and is oriented in a certain direction. As a method for forming an image, a heating roll, a hot stamp, a thermal head, heating by a laser, or the like can be used.
[0024]
The authenticity determination film 16 in the present invention is a circularly polarizing film. The circularly polarizing film is a film in which a quarter-wave film is stacked on a polarizing film. The polarizing film includes a PVA-iodine type obtained by absorbing iodine in a PVA stretched film, a dichroic dye type, a metal or metal compound containing type, a polyene type such as a polyene type, and particularly a PVA-type. Iodine type and dichroic dye type films are used.
[0025]
As shown in FIG. 9, in another second example of the forgery prevention card, an oversheet layer and a magnetic tape are provided on a base material, and a reflective layer 31, a latent image forming layer 32, and a protective layer 33 are provided thereon. They are provided sequentially.
The protective layer 33 in the present invention has a role of protecting the latent image forming layer 32 from external damage and of preventing the latent image image from being visually recognized by the image forming trace from the heat pressure during image formation. For example, conventionally known thermoplastic resins such as acrylic resins, urethane resins, vinyl chloride resin-vinyl acetate copolymer resins, polyester resins, melamine resins, epoxy resins, polystyrene resins, and polyimide resins, and thermosetting Resins or ultraviolet or electron beam curable resins can be used alone or as a mixture.
[0026]
Furthermore, in order to prevent print marks at the time of image formation by a thermal head or the like, a curing agent for crosslinking the resin, waxes such as polyethylene washes, carnauba wax, silicon wax, or calcium carbonate, zinc stearate, silica, alumina, An extender such as talc and fats and oils such as silicone fats and oils can be added to the extent that transparency is not impaired.
The resin used for the protective layer 33 is applied by a known coating means such as a gravure printing method, a screen printing method, a nozzle coater method, and a printing means such as an offset printing method and a flexographic printing method.
[0027]
FIG. 14 is an explanatory view conceptually showing the state of the optical path between the layers in the card medium having a latent image of the present invention, that is, between the polarizing film 72, the latent image forming layer 73, and the reflective layer 74. The white irradiation light 75, which is elliptically polarized from the light source 71 through the polarizing film 72, partially passes through the latent image forming layer 73 having anisotropy in molecular orientation, changes to linearly polarized light 76, and becomes a reflective layer. The linearly polarized light 77 reflected by the light 74 passes through the latent image forming layer 74 again and is changed to elliptically polarized light 78.
Then, the transmitted light 79 is obtained again through the polarizing film 72. Since the intensity of the transmitted light 79 varies depending on the wavelength, images having various hues can be obtained. Further, the visible hue differs depending on the angle between the orientation direction of the polarizing film and the molecular image-oriented latent image forming layer.
[0028]
【Example】
Hereinafter, the present invention will be described in detail with reference to examples.
<Example 1>
As shown in FIG. 3, a 0.6 mm thick white PVC (Mitsubishi Resins: Diafix) sheet is used as a base material, and a reflective layer ink comprising the following [reflective layer composition] is formed on the surface of the base material 11. Was printed by screen printing, and a reflective layer 12 having a thickness of 2 to 3 μm was provided.
Further, in order to provide a latent image forming layer, a thermotropic polymer material ink having the following [composition of the latent image forming layer] is printed by a screen printing method to form a latent image forming layer 12 of about 0.5 μm. Further, a picture printing layer was printed by a screen printing method. Further, a pattern printing layer was applied to the back surface of the substrate 11 by offset printing.
[0029]
Next, a transparent PVC (Diafix: manufactured by Mitsubishi Plastics, Inc.) sheet having a thickness of 0.1 mm is overlaid on the front and back surfaces of the printed base material 11 as oversheet layers 16 and 17, and a stainless steel plate having a smooth surface is provided. , And heat-bonded at 140 ° C. for 20 minutes to solidify by cooling.
Thereafter, it was punched into a card shape to obtain a forgery prevention card having a latent image.
[Composition of reflective layer]
・ Silver color pigment (Toyo Ink Mfg. Co., Ltd .: SS8-97628 Shinshin Silver)
・ Screen ink medium (Toyo Ink Mfg. Co., Ltd .: SS8-000)
[Composition of polymer liquid crystal layer]
・ 20 parts by weight of polymer liquid crystal (Akira Denka Kogyo KK: Kiracol PLC-7003)
・ 40 parts by weight of tetrahydrofuran ・ 40 parts by weight of toluene
The anti-counterfeit card having the obtained latent image cannot visually recognize the latent image at all, but only looks like a mere overprint card. However, when viewed through the authenticity determination film 16, the latent image pattern appeared clearly, and a good latent image could be confirmed.
In addition, although the forgery prevention card was color-copied, the latent image could not be reproduced, and it was found that forgery was impossible.
[0031]
<Example 2>
As shown in FIG. 6, a 0.6 mm thick white PVC (Mitsubishi Resin: Diafix) sheet is used as a base material, and a reflective layer ink comprising the following [reflective layer composition] is formed on the surface of a base material 21. Was printed by screen printing, and a reflective layer 22 having a thickness of 2 to 3 μm was provided. Further, in order to provide a latent image forming layer, a thermotropic polymer material ink comprising the following [latent image forming layer composition] is printed by a screen printing method to form a latent image forming layer 23 of about 0.5 μm. Further, the picture print layer 28 was printed by a screen printing method. Further, a pattern printing layer 29 was applied to the back surface of the substrate 21 by offset printing.
[0032]
Next, a transparent PVC (Diafix: manufactured by Mitsubishi Plastics, Inc.) sheet having a thickness of 0.1 mm obtained by transferring the magnetic tape 24 to the surface of the printed base material 21 is used as the oversheet layer 25, and the same sheet is formed on the back surface. Were stacked as an oversheet layer 26, sandwiched between stainless steel plates having a smooth surface, and subjected to pressure bonding and heat fusion at 140 ° C. for 20 minutes to be cooled and solidified.
Thereafter, it was punched into a card shape to obtain a forgery prevention card having a latent image.
[Composition of reflective layer]
・ Silver color pigment (Toyo Ink Mfg. Co., Ltd .: SS8-97628 Shinshin Silver)
・ Screen ink medium (Toyo Ink Mfg. Co., Ltd .: SS8-000)
[Composition of polymer liquid crystal layer]
・ 20 parts by weight of polymer liquid crystal (Akira Denka Kogyo KK: Kiracol PLC-7003)
-Cyclohexanone 40 parts by weight-toluene 40 parts by weight
The anti-counterfeit card having the obtained latent image cannot visually recognize the latent image at all, but only looks like a mere overprint card. However, when visually observed through the authenticity determination film 27, the latent image pattern clearly appeared, and a good latent image could be confirmed.
In addition, although the forgery prevention card was color-copied, the latent image could not be reproduced, and it was found that forgery was impossible.
[0034]
<Example 3>
As shown in FIG. 9, a white PETG / PC (Diafix: manufactured by Mitsubishi Plastics, Inc.) sheet having a thickness of 0.6 mm was used as a base material, and a pattern printing layer 45 was applied to the back surface of the base material 41 by offset printing. . A transparent PETG / PC (Diafix: manufactured by Mitsubishi Plastics Co., Ltd.) sheet having a thickness of 0.1 mm in which a magnetic tape 42 is transferred to the surface of the base material 41 is used as the oversheet layer 43, and the same sheet is also used on the back surface. It was stacked as 44, sandwiched between stainless steel plates with a smooth surface, and subjected to pressure bonding and heat fusion at 140 ° C. for 20 minutes to cool and solidify.
[0035]
Next, on the surface of the base material, a magnetic concealment / reflection layer ink composed of the following [composition of the magnetic concealment / reflection layer] was printed by screen printing to provide a magnetic concealment / reflection layer 31 having a thickness of 2 to 3 μm. Further, in order to provide a latent image forming layer, a thermotropic polymer material ink having the following [latent image forming layer composition] is printed by a screen printing method to form a latent image forming layer 32 of about 0.5 μm. Further, the picture print layer 46 was printed by a clean printing method.
Thereafter, an ink for a protective layer having the following [composition of protective layer] was printed by an offset printing method to form a protective layer 33 of about 3 μm. This protective layer was formed by printing and coating about 1 μm of an anchor medium by an offset printing method, and printing and coating a top coat varnish by about 2 μm by an offset printing method.
Next, it was sandwiched between stainless steel plates having a smooth surface, pressed at 105 ° C. for 20 minutes to make the surfaces flush, and punched into a card shape to obtain a forgery prevention card having a latent image.
[0036]
[Composition of magnetic concealment / reflection layer]
・ Silver color pigment (Toyo Ink Mfg. Co., Ltd .: SS8-97628 Shinshin Silver)
・ Polyester acrylate ・ Acrylic monomer ・ Photopolymerization initiator [Composition of polymer liquid crystal layer]
・ 20 parts by weight of polymer liquid crystal (Akira Denka Kogyo KK: Kiracol PLC-7003)
・ 40 parts by weight of tetrahydrofuran ・ 40 parts by weight of toluene [Composition of protective layer]
-100 parts by weight of anchor medium (Toyo Ink Mfg. Co., Ltd .: FDS medium TPO)
・ 100% by weight of top coat varnish (manufactured by T & K TOKA: Matt OP varnish 3H)
[0037]
The anti-counterfeit card having the obtained latent image cannot visually recognize the latent image at all, but only looks like a mere overprint card. However, when viewed through the authenticity determination film 34, the latent image pattern appeared clearly, and a good latent image could be confirmed.
In addition, although the forgery prevention card was color-copied, the latent image could not be reproduced, and it was found that forgery was impossible.
[0038]
【The invention's effect】
According to the anti-counterfeit card according to the present invention, it is possible to manufacture a anti-counterfeit card having a latent image in which the image pattern is completely invisible by using a polymer liquid crystal having an image pattern as the latent image forming means. It becomes. In addition, since the latent image can be confirmed by a simple verification method that the latent image appears through the dedicated authenticity determination film, the anti-counterfeit card can be a high anti-counterfeiting card. . Therefore, the anti-counterfeit card of the present invention exhibits excellent practical effects.
[Brief description of the drawings]
FIG. 1 is a plan view showing an embodiment of a forgery prevention card according to the present invention.
FIG. 2 is a plan view showing a latent image that appears when the authenticity determination film is placed on the forgery prevention card of FIG. 1;
FIG. 3 is a sectional view taken along line XX in FIG. 2;
FIG. 4 is a plan view showing another first example of the forgery prevention card of the present invention.
FIG. 5 is a plan view showing a latent image that appears when an authenticity determination film is placed on the forgery prevention card of FIG. 4;
FIG. 6 is a sectional view taken along line YY in FIG. 5;
FIG. 7 is a plan view showing another second example of the forgery prevention card of the present invention.
FIG. 8 is a plan view showing a latent image that appears when an authenticity determination film is placed on the forgery prevention card of FIG. 7;
FIG. 9 is a sectional view taken along line ZZ in FIG. 8;
FIG. 10 is a plan view showing another third example of the forgery prevention card of the present invention.
FIG. 11 is a plan view showing a latent image that appears when an authenticity determination film is placed on the surface of the forgery prevention card of FIG. 10;
FIG. 12 is a plan view showing a latent image that appears when the authenticity determination film is placed on the back surface of the forgery prevention card of FIG. 10;
FIG. 13 is a sectional view taken along line Z2-Z2 in FIGS. 11 and 12;
FIG. 14 is an explanatory view conceptually showing a state of an optical path between layers of the forgery prevention card of the present invention.
[Explanation of symbols]
1. Forgery prevention cards 2, 3, 5 ... Forgery prevention cards with magnetic tape 11, 21, 41, 61 ... Base materials 12, 31, 51, 62, 74 ... Reflective layers 13, 23, 32, 52 ., Latent image forming layers 14, 15, 25, 26, 43, 44, 65, 67. oversheet layers 16, 27, 34, 54, 68. 66, magnetic tapes 28, 29, 45, 46, picture printing layers 33, 53, protective layer 71, light source 72, polarizing film 75, white irradiating light 76, 77 ... Linear polarized light 78, elliptical polarized light 79, transmitted light

Claims (7)

A forgery prevention card characterized in that a reflection layer and a latent image forming layer are formed in this order on at least one surface of a sheet-like substrate from the side closer to the substrate. A forgery prevention card, wherein a reflection layer, a latent image forming layer, and a protective layer are formed in this order on at least one surface of a sheet-like substrate from the side closer to the substrate. 3. The forgery prevention card according to claim 1, wherein the reflection layer is provided by printing using an ink containing 20 to 40% of aluminum powder. 3. The image forming apparatus according to claim 1, wherein the latent image forming layer is provided by printing an image pattern such as an arbitrary character or picture using an ink containing a polymer liquid crystal material exhibiting thermotropic property. Item 3. The forgery prevention card according to Item 3. The latent image forming layer is made of a polymer liquid crystal material having a thermotropic property, and the polymer pattern is oriented by heating and pressurizing the image pattern. The forgery prevention card according to any one of claims 1 to 4, wherein a pattern is displayed. The forgery prevention card according to any one of claims 1 to 5, wherein the authenticity determination film is a circularly polarizing film. The forgery prevention card according to any one of claims 1 to 6, further comprising an information recording unit using at least one of an IC module and a magnetic recording layer.

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