JP2001283429A - Magnetic information transferring foil and method for forming magnetic information using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide magnetic information transferring foil high in forgery preventing effect and a method for forming magnetic information by using the foil. SOLUTION: This magnetic information transferring foil 10 has a roughened part 13 which consists of surface roughening ink and is formed on a resin film substrate 11 being a support while interposing, if necessary, a releasing layer 17, a ferromagnetic material thin film layer 15 is formed on the substrate 11 or the layer 17 for keeping magnetic information characteristics corresponding to the patterns of the part 13 in the layer 15 and a heat sealing agent or adhesive layer 18 is formed on the layer 15. This method for forming magnetic information comprises transferring the foil 10 to the medium to be transferred.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a magnetic information transfer foil and a magnetic information forming method using the same. Specifically, via a release layer as necessary on the resin film substrate,
A magnetic information transfer foil, wherein a roughened portion is provided with an ink whose surface is roughened, and a ferromagnetic material thin film layer is provided on the resin film substrate or on the release layer or the roughened portion. And a magnetic information forming method using the same. Such a magnetic information transfer foil can be used as a credit card or a prepaid card by transferring it to a vinyl chloride or PET plastic base material.
It can be used for various security media such as gift certificates, certificates, passports, tickets, voting tickets, tickets, labels and the like.

[0002]

2. Description of the Related Art As a countermeasure for preventing forgery of various security media, an information recording medium carrying magnetic information has been conventionally used. The prepaid cards most frequently used in Japan as magnetic information recording medium cards include telephone cards and pachinko game cards. However, these cards have the problem of being easily altered or tampered with. The technology proposed in JP-A-6-286368 as a countermeasure against this alteration and tampering utilizes a composition which is not normally available, a magnetic characteristic peculiar to the material, and a method for preventing rewriting to the second recording area of the card. There has been proposed a method of using a security code written in advance. To write this security code, it is necessary to form a magnetic pattern that can be read magnetically. As a method of forming the magnetic pattern, the magnetic material is irradiated with a laser so that the magnetic material disappears or the magnetic characteristics are changed. The magnetic material is removed by etching using photolithography and printing. A transfer foil made of a ferromagnetic film is transferred in a pattern by applying heat and pressure. However, there is a problem that a long time is required for patterning or the cost is increased.

For this reason, Japanese Patent Application Laid-Open No. 10-64051 proposes, as a data recording carrier having a more sophisticated forgery prevention structure, a magnetically patterned magnetic plate or the like as a structure combining a roughened portion and a magnetic film. ing. In view of the above, the present invention is to provide a magnetic information transfer foil obtained by further improving such a magnetic plate and a magnetic information forming method using the same, thereby achieving a further forgery prevention effect.

[0004]

Means for Solving the Problems The first aspect of the present invention to solve the above-mentioned problems is that a roughened ink is provided on a resin film substrate serving as a support through a release layer if necessary. By providing a ferromagnetic material thin film layer on the resin film base material or on the release layer, the ferromagnetic material thin film layer retains a characteristic magnetic information characteristic according to the roughened portion pattern. And a heat sealing agent layer or a pressure-sensitive adhesive layer formed on the ferromagnetic material thin film layer. Since such a magnetic information transfer foil is used, it can be transferred to a transfer-receiving medium to prevent a high degree of forgery.

[0005] Such a magnetic information transfer foil may have a structure in which a portion having a roughened portion and a portion having no roughened portion are combined so as to give a constant read signal, and the center line average roughness of the roughened portion is provided. If Ra is in the range of 1.0 μm to 20 μm, the effect of the roughened portion can be reliably provided. Further, if a light reflecting layer is provided between the ferromagnetic material thin film layer or the roughened portion and the resin film substrate or the release layer, the effect of the glittering transfer foil can be provided, and if the concealing layer is provided. The magnetic layer can be hidden. Further, the ferromagnetic material thin film layer can be an amorphous ferromagnetic material.

A second aspect of the present invention for solving the above-mentioned problems lies in a method for forming magnetic information, which comprises transferring the magnetic information transfer foil to a medium to be transferred. With this magnetic information forming method, magnetic information that is difficult to forge can be easily formed. In the above, the magnetic information transfer foil can be transferred so as to partially destroy the roughened portion pattern. In this case, it is possible to form magnetic information that is more difficult to forge.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, a roughened portion is provided on a base made of a resin film via a release layer as necessary, and a ferromagnetic material thin film is formed on the surface by a vapor phase method such as sputtering. The present invention relates to a magnetic information transfer foil and a magnetic information forming method using the same. Since the ferromagnetic material thin film layer used in the present invention is basically a thin film formed by vapor phase growth such as evaporation or sputtering, when detecting the magnetic properties of the thin film, a resin film substrate on which the thin film is formed If the surface roughness is not less than about several μm, the magnetic properties inherent to the magnetic material do not appear. For example, as a resin film substrate, P having a flat surface area with a surface roughness of about 0.01 to 0.1 μm
An ET film is required. At this time, if a magnetic material is deposited on a porous non-flat area with a surface roughness of several μm or more, the original magnetic properties of the deposited magnetic material Does not appear, and the magnetic detection signal becomes weak or disappears. The present invention utilizes such a phenomenon, eliminates complicated steps such as etching, provides a roughened portion with a roughened ink on a substrate having releasability, and forms a magnetic film on the roughened portion. And used for a magnetic information transfer foil.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of the magnetic information transfer foil of the present invention. In the case of this embodiment, the magnetic information transfer foil 10 has a roughened portion 13 made of roughened ink formed on a base material 11 made of a resin film via a release layer 17 as necessary, and the surface of the resin film base material is formed. Alternatively, the ferromagnetic material thin film layer 15 is provided so as to follow the roughened portion 13 on the release layer and the surface of the roughened portion. As described above, the roughened portion 13 is read by the magnetic head giving magnetic characteristics with a small squareness ratio, and the smooth portion without the roughened ink is given a magnetic characteristic with a large squareness ratio. The surface of the roughened portion 13 is required to be a rough surface, but the thickness Δh of the roughened portion from the surface of the resin film base material itself is not an important factor affecting magnetic properties. Here, “follow” means that when a ferromagnetic material thin film layer is vapor-phase-formed on the roughened portion unevenness by the roughened ink, the thin film surface is substantially parallel to the roughened portion shape and approximated. It means that a thin film having a continuous film surface without intermittent in a state of being formed.

In a preferred embodiment of the present invention, as will be described later, the roughening section 13 has a configuration in which a portion is present and a portion which is not present. Is to give information. Further, on the upper surface of the ferromagnetic material thin film layer 15, a heat sealing agent layer or a pressure-sensitive adhesive layer 18 for bonding to the medium to be transferred is provided.

Hereinafter, each component of the magnetic information transfer foil will be described in more detail. As the resin film substrate 11, a resin film having solvent resistance and heat resistance can be used, and generally, polyethylene terephthalate (PET)
Other examples include resin films, other polyester resin films, polyamide resin films, polyimide resin films, polycarbonate resin films, polystyrene resin films, polypropylene resin films, polysulfone resin films, polyphenylene sulfide resin films, and cellulosic resin films.
The thickness is about 5 to 300 μm, preferably 10 to 50 μm.
A thickness of μm can be recommended.

The release layer 17 serves to adhere the roughened portion 13 and the ferromagnetic thin film layer 15 to the substrate 11 with releasability, and to protect the resin layer to some extent after transfer. Is also provided. As a material of this layer, a resin having sufficient transparency, abrasion resistance, stain resistance, and solvent resistance, for example, (meth) acrylate resin, vinyl chloride resin, vinyl acetate resin, urethane A simple resin, a melanin resin, a polyester resin, a mixture, and a copolymer are used. Further, it may be formed from a release agent such as a wax, a silicone wax, a silicone resin, and a fluororesin. The release layer 17 is formed by applying and drying an ink prepared by dissolving or dispersing the above-described resin with necessary additives in an appropriate solvent on a substrate by a known means. It can be carried out. The thickness of the release layer 17 is preferably about 0.5 to 5 μm, and more preferably 1 to 3 μm. Note that an overprint layer may be formed between the release layer 17 and the roughened portion 13 in order to increase the adhesion between the two layers and increase the durability of the resin layer.

The surface-roughened ink is made of non-magnetic metal, carbon,
Ceramics or oxides such as alumina, silica, titania, calcium carbonate, and submicron such as resin powder
Particles 12P of several tens μm, preferably 1 to 30 μm are bound with a binder (resin or the like) and dissolved in a solvent to form an ink. The ink does not need to be colored because its purpose is to make the substrate surface uneven or rough. In the present invention, it is preferable that the surface roughness of the roughened portion by the roughening ink is sufficiently larger than the thickness of the ferromagnetic material thin film layer 15. The roughened portion by the roughening ink may be two-dimensionally scattered, and may be formed so that certain uneven stripes are arranged in a certain direction. However, even in the case of a stripe shape, since the pitch is a coarse pitch provided by printing, an effect such as a diffraction grating does not occur.

The thickness Δh of the roughened portion by the roughened ink is:
Since the thickness is 1 μm to several tens μm, it can be made sufficiently thicker than the thickness of the ferromagnetic material thin film layer 15. However,
When the thickness of the ink layer increases, cracks in the ink layer, cracks in the magnetic film, and the like occur. Further, when the surface roughness Ra (center line average roughness) of the printing surface of the roughened ink is 1 μm or less, the effect of reducing the magnetic anisotropy is reduced, and the Ra is 1 μm to 20 μm.
m is more preferably in the range of m. The lower limit is because the magnetic anisotropy reducing effect is remarkably expressed,
The upper limit is because, in order to further increase the surface roughness, an ink containing particles having a larger particle size is required, and the dispersibility is poor, so that it is difficult to produce the ink. Printing of such a roughened ink can be performed by intaglio printing such as silk screen printing or gravure printing.

Next, the ferromagnetic material thin film layer 15 may be crystalline or amorphous, and may be made of iron (Fe),
A magnetic material composed of one or a combination of two or more of cobalt (Co) and nickel (Ni) is used as a main component, and boron (B), carbon (C), magnesium (Mg), aluminum ( Al), silicon (Si), phosphorus (P), sulfur (S), titanium (Ti), vanadium (V), chromium (Cr), manganese (Mn), copper (C
u), zinc (Zn), yttrium (Y), zirconium (Zr), niobium (Nb), molybdenum (Mo), palladium (Pd), silver (Ag), indium (In),
Tin (Sn), tantalum (Ta), tungsten (W),
It is composed of an additive of several kinds of metal or nonmetal elements selected from iridium (Ir), platinum (Pt), gold (Au), and lead (Pb).

The ferromagnetic material thin film layer is formed by sputtering, vapor deposition, ion plating, or the like using a target material or a vapor deposition source with a material composed of an alloy composed of iron, cobalt, and nickel as main components and an additive element or a mixture thereof. Is formed on the roughened portion by means using a vacuum process. The ferromagnetic material is represented by a material based on cobalt Co-zirconium Zr or iron Fe-silicon Si. The thickness of the ferromagnetic material thin film layer is suitably from 50 to 500 nm. The reason that the lower limit of the layer is 50 nm or less is because the thickness of the magnetic layer becomes thinner, the saturation magnetic flux decreases as the absolute amount of the magnetic substance decreases, and the magnetic signal decreases. This is because the magnetic material needs to have a thickness of 50 nm or more in order to obtain a magnetic signal to be used.
The reason why the upper limit is set to 500 nm is to clearly distinguish the magnetic film (usually 1 μm or more in thickness) produced by another method, and it is preferable to avoid making it thicker. is there. Further, when the thickness is more than this, the characteristics of the magnetic information transfer foil deteriorate due to curl or the like due to internal stress of the film, and wrinkles and cracks may occur. From the viewpoint of the productivity of the ferromagnetic material thin film layer and the stability of the magnetic signal, the preferable thickness of the layer is 150 nm.
３００300 nm (1500-3000 °).

Such a ferromagnetic material thin film layer exhibits unique characteristics in terms of Hc (coercive force) and Bm (saturation magnetic flux density). Is the nonlinear BH
Since it has characteristics (hysteresis curve), it can be clearly distinguished from general magnetic materials. The ferromagnetic material thin film layer used in the present invention has a Hc (coercive force) of 40 to 4000.
A / m (0.5 to 50 Oe), Rsq (square ratio)
It is preferably from 0.75 to 1.0. FIG. 2 shows a hysteresis curve of the ferromagnetic material thin film layer. As shown in FIG. 2 (A), the ferromagnetic material thin film layer 15 has a small coercive force Hc on a smooth and uneven surface of the base material. And high squareness ratio (0.
8 to 1.0) is obtained. On the other hand, as shown in FIG. 2 (B), the saturation magnetic flux density Bm is reduced and a hysteresis characteristic of a low squareness ratio (0.5 or less) is obtained on the uneven substrate surface or the roughened portion. The squareness ratio Rs
q is represented by Rsq = Br (residual magnetic flux density) / Bm (saturated magnetic flux density).

A non-magnetic metal film can be provided as a light reflection layer between the ferromagnetic material thin film layer 15 or the roughened portion 13 and the resin film substrate 11 or the release layer 17. That is, before providing the ferromagnetic thin film layer 15 or the roughened ink layer directly on the release layer when the release layer is provided, or directly on the base material 11 when the release layer is not provided, a light reflection layer is provided thereon. Is provided on the entire surface. In such a case, the glossy color of the non-magnetic metal is observed from the outside as reflected light without being affected by the color of the ferromagnetic thin film after the transfer. A magnetic information transfer foil that is no different from a foil is provided. For such a light reflecting layer, a reflective non-magnetic metal material is used, and gold, silver, aluminum, chromium, nickel, or the like is used. Generally, aluminum is preferably used because of its cost and technical problems, and its thickness is 10 nm.
It can be formed to a thickness of about 200 nm.
The thickness is about 0 to 100 nm.

Similarly to the light reflection layer, the ferromagnetic material thin film layer 15 or the roughened portion 13 and the resin film substrate 11 or the release layer 1
7, a concealing layer can be provided. In general, the magnetic material has a brown or black color, and thus may lose its appearance when transferred to a medium to be transferred. Therefore, it may be desirable to provide a layer for concealing the magnetic material layer on the magnetic information transfer foil in advance. This concealing layer was printed with a white ink of titanium oxide having a high concealing effect, printed simultaneously with a pattern, or printed with aluminum powder, a printing ink containing a concealing pigment such as silicon oxide, or aluminum deposited. The hiding layer is formed by a method such as printing a white ink on the above. The thickness of the concealing layer may be any thickness as long as it has a thickness capable of concealing the magnetic layer, and is in the range of 1 to several μm.

FIG. 3 is a plan view showing an example of a roughened portion of the magnetic information transfer foil. It shows a pattern of a configuration combined so as to give a specific magnetic characteristic as described above, wherein the roughened portion 13 and the “no” portion 13n of the roughened portion correspond to the scanning direction of the magnetic head or the length of the transfer foil. Different read magnetic characteristics are provided in the vertical direction. FIG.
In (A), the "existing" portion 13 and the "absent" portion 13n of the roughened portion are formed in a periodic pattern that repeats alternately in the length direction of the transfer foil. As described above, the magnetic signal weakens or disappears in the portion having the roughened portion. Therefore, the “present” portion of the roughened portion is “0”, and the “absent” portion is “1”.
Then, a repetition signal of 0, 1, 0, 1 is obtained. In FIG. 3B, the "existing" portion 13 of the roughening portion
And the "absent" portion 13n are 2 with respect to the length direction of the transfer foil.
Each is formed in a periodic pattern that repeats in order. If the "existing" portion of the roughening section is "0" and the "absent" portion is "1", a repeated signal of 0, 0, 1, 0, 0, 1 can be obtained.

The heat sealing agent layer or the pressure-sensitive adhesive layer 18
This is for obtaining a sufficient adhesive strength when the magnetic information transfer foil 10 is transferred onto a predetermined medium to be transferred, and a conventionally known heat-sensitive adhesive or pressure-sensitive adhesive is used according to the application. Examples of the heat-sensitive adhesive include acrylic resins, vinyl resins, polyester resins, urethane resins, amide resins, and epoxy resins, and examples of adhesives include acrylic and rubber-based adhesives. . The coating thickness may be within 1 to several μm. Usually, when the layer is a pressure-sensitive adhesive layer, an adhesive is applied to a protective release paper provided on a transfer foil medium, and then the protective release paper and the transfer foil are integrated to use the transfer foil. Then, when the release paper is removed, the pressure-sensitive adhesive is transferred onto the ferromagnetic material thin film layer to be ready for use. Therefore, the step of directly applying the pressure-sensitive adhesive on the ferromagnetic material thin film layer is rarely performed.

FIG. 4 is a cross-sectional view showing a state in which the magnetic information transfer foil is transferred to a transfer medium. When transferring the magnetic information transfer foil 10 to the transfer-receiving medium 30, if the adhesive layer is a heat sealing agent, the foil is pressed while heating and pressing with a hot roll or the like or in a state where the hot stamp foil is transferred. The image is transferred to the transfer medium 30. If the adhesive layer is a pressure-sensitive adhesive, peel off the protective release paper and directly apply the pressure-sensitive adhesive layer,
The image can be transferred by pressing the medium to be transferred 30 under pressure. At this time, since the base material 11 is removed by peeling from the release layer 17, only the thin layer portion of the magnetic information transfer foil can be transferred. It is preferable that the release layer 17 be left on the transfer medium 30 side and have a protective coating function as described above.

The magnetic information transfer foil can be transferred such that the ferromagnetic thin film layer is partially destroyed by a dry process using a laser beam or a thermal head. For example, a YAG laser having an irradiation energy of several watts and a beam diameter of 50 μm (wavelength 1064)
In the case of scanning at a speed of 100 mm / sec using (nm), patterning with a line and space of 0.2 mm can be easily performed. In many cases, a useful forgery prevention effect can be achieved by patterning the ferromagnetic material thin film layer into a barcode shape.

FIG. 5 is a diagram illustrating a reading device.
FIG. 5A shows that the magnetic head 41 is AC-excited (5 to 10).
kHz, 2 to 5 Vpp), a device for detecting the output voltage with the detection coil 43, and FIG. 5B shows the signal waveform of the reference coil 44 when the magnetic head 41 is AC-excited and the detection coil output waveform (FIG. 5C). ) Are compared to detect. FIG.
FIG. 7 is a diagram illustrating a method for reading magnetic information. FIG. 6A shows an input AC waveform in the apparatus shown in FIG.
(B) shows the output waveform of the detection coil. A pulse P appears in the output waveform corresponding to the magnetic information recording unit. In this state, if the difference is obtained by combining the input and output phases and intensities, FIG.
The pulse signal of (C) is obtained. The authenticity can be determined by looking at the peak height, half width, position, and frequency component of the pulse. When comparing with the output of the reference electrode in the device of FIG.

After a predetermined signal is recorded by transferring the magnetic information transfer foil and read by a magnetic head, the ferromagnetic material thin film layer has a high pulse signal as shown in FIG. Appear in the roughened portion, and the signal in which the pulse intensity is reduced and the half width is increased is shown (FIG. 7B). When this transfer portion is scanned by the magnetic head, the signal waveform shown in FIG. 7C is shown.
It can be read as a signal of 1, 0,.

[0025]

EXAMPLES Examples 1 to 4 of the present invention and Comparative Example 1 will be described below with reference to the drawings. In Examples 1 to 3, when the roughened ink particles having different particle diameters were used, in Example 4, when a light reflecting layer was added to Example 1, Comparative Example 1 was used.
Indicates the case where the particle size of the granular material is fine. Therefore, the base material, release layer formation, roughened ink printing conditions, ferromagnetic material thin film layer formation, and heat sealant layer formation conditions used in Example 2 and below are the same as in Example 1. . (Example 1) <Preparation of magnetic information transfer foil> As a resin film substrate film 11 of the magnetic information transfer foil, a transparent polyethylene terephthalate film having good smoothness (“Lumirror 25T60” manufactured by Toray Industries, Inc.) [thickness: 25 μm] In order to impart releasability, a methyl methacrylate-based acrylic resin is diluted with toluene, and a thin release layer 17 is formed by gravure printing.
Coated as

Subsequently, with a roughened ink having the following composition,
A 2 mm wide striped roughened portion was printed by gravure printing and dried. The thickness Δh of the roughened portion after drying is 7 μm.
m. In addition, when the roughened portion is cut into the transfer foil, as shown in FIG.
The printing was performed so that n and the “present” portion of the roughening portion 13 were repeated in the length direction of the transfer foil. [Ink composition] Binder; vinyl chloride / vinegar / urethane resin 100 parts by weight Granular substance: micro silica (particle size: 5.5 μm) 10 parts by weight

Subsequently, a ferromagnetic material thin film layer 15 made of iron-Fe-Si is formed on the roughened portion and on the surface of the resin film substrate having no roughened portion by a sputtering method so as to have a thickness of 0.1 mm.
The film was formed to have a thickness of 2 μm.

(Example 2) <Preparation of magnetic information transfer foil> As in Example 1, a release layer 17 was applied to the same base material under the same conditions, and a roughened ink having the following composition was further applied. Thus, a roughening portion was provided under the same conditions as in Example 1. [Ink composition] Binder; polyvinyl chloride / urethane resin 100 parts by weight Granular substance: micro silica (particle diameter 2.5 μm) 10 parts by weight

Subsequently, a ferromagnetic material thin film layer 15 made of iron-Fe-Si is formed on the roughened portion and on the surface of the resin film substrate having no roughened portion by a sputtering method so as to have a thickness of 0.1 mm.
The film was formed to have a thickness of 2 μm.

Example 3 <Preparation of Magnetic Information Transfer Foil> In the same manner as in Example 1, the same substrate was coated with a release layer 17 under the same conditions, and a roughened ink having the following composition was further prepared. Thus, a roughening portion was provided under the same conditions as in Example 1. [Ink composition] Binder; polyvinyl chloride / urethane resin 100 parts by weight Granular substance: micro silica (particle diameter 25 μm) 10 parts by weight

Subsequently, a ferromagnetic material thin film layer 15 made of iron-Fe-Si is formed on the roughened portion and on the surface of the resin film substrate having no roughened portion by a sputtering method so as to have a thickness of 0.1 mm.
The film was formed to have a thickness of 2 μm.

Example 4 <Preparation of Magnetic Information Transfer Foil> As in Example 1, the same substrate was coated with the release layer 17 under the same conditions, and then the light reflection layer 14 was formed by a vapor deposition film of Al. The thickness, 30nm (300mm)
Formed. Then, with the roughening ink of the following composition,
The roughening part was provided under the same conditions as in Example 1. [Ink composition] Binder; vinyl chloride / vinegar / urethane resin 100 parts by weight Granular substance: micro silica (particle size: 5.5 μm) 10 parts by weight

Subsequently, a ferromagnetic material thin film layer 15 made of iron-Fe-Si is formed on the roughened portion and on the surface of the resin film substrate having no roughened portion by a sputtering method so as to have a thickness of 0.1 mm.
The film was formed to have a thickness of 2 μm.

(Comparative Example 1) <Preparation of Magnetic Information Transfer Foil> As in Example 1, the same substrate was coated with a release layer 17 under the same conditions, and a roughened ink having the following composition was further applied. Thus, a roughening portion was provided under the same conditions as in Example 1. [Ink composition] Binder; 100 parts by weight of polyvinyl chloride / urethane-based resin Granular substance: 10 parts by weight of micro silica (particle diameter 0.8 μm)

Then, a ferromagnetic material thin film layer 15 made of iron-Fe-Si is formed on the roughened portion and on the surface of the resin film substrate having no roughened portion by a sputtering method so as to have a thickness of 0.1 mm.
The film was formed to have a thickness of 2 μm.

The magnetic properties and the surface roughness Ra (center line average roughness) of the magnetic information transfer foils of Examples 1 to 4 and Comparative Example 1 before application of the heat sealing agent were measured. As a result, the squareness ratio in the smooth portion 13n having no roughened portion by the roughened ink was 0.9 in each case. The squareness ratio, coercive force, Ra and evaluation in the roughened portion 13 are as shown in the following table. The unit of the coercive force is A / m. Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Squareness ratio 0.2 0.6 0.2 0.2 0.8 Coercive force 3200 2800 2400 3200 1200 Ra 5 μm 2.2 μm 18 μm 5 μm 0.5 μm Evaluation ◎ 〇 × × The squareness ratio was measured by a DC magnetic field of a VSM (sample vibrating magnetometer), but the same result was obtained by measurement by an AC magnetic field. The coercive force was measured by a BH analyzer (manufactured by Iwasaki Communication Equipment Co., Ltd.). The surface roughness was measured by a deck tack surface roughness meter manufactured by Sloan. The unit of the coercive force is A / m. Evaluation: 低 The low squareness ratio effect is remarkable.良好 Good low squareness ratio effect. C: No low squareness ratio effect is observed. △ Inking, printing difficult.

<Transfer to Transferred Media> A 1 μm thick polyvinyl chloride-based hot-melt type heat sealant was applied to the ferromagnetic material thin film layer 15 of Examples 1 to 3 and Comparative Example 1, Using a slitter, the magnetic information transfer foil of the present invention was completed by slitting to a width of 10 mm so as to be orthogonal to the stripe of the roughened portion. Thereafter, as shown in FIG. 4, the magnetic information transfer foils of Examples 1 to 4 and Comparative Example 1 were applied to a vinyl chloride card base material at 135 ° C. and 0.7 ° C. using a heating roller.
Transfer for 2 seconds. At this time, the base material 11 is
And removed.

The magnetic properties of the magnetic information transfer foils of Examples 1 to 4 and Comparative Example 1 were measured after being transferred to a vinyl chloride card. As a result, the squareness ratio in the smooth portion 13n having no roughened portion by the roughened ink was 0.9 in all cases.
The squareness ratio and coercive force of the roughened portion were as follows. The unit of the coercive force is A / m. Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Squareness ratio 0.2 0.6 0.2 0.2 0.8 0.8 Coercive force 3200 2800 2400 3200 1200 The measuring equipment is the same as above. .

As a result, in the roughened portion, it is generally recognized that the squareness ratio is reduced, and the magnetic readability is deteriorated. It was observed that the effect of the type comparison was reduced. However,
When the added granular material becomes coarse, the squareness ratio decreases, but it is difficult to form an ink or print.

[0040]

According to the magnetic information transfer foil of the present invention, a roughened portion is formed on a resin film substrate by a roughening ink, and the magnetic information transfer foil is formed on the resin film substrate on the roughened portion and the non-roughened portion. Since the magnetic thin film layer is formed, specific magnetic characteristics can be given, and a forgery prevention effect that cannot be obtained with a normal magnetic transfer foil or glitter transfer foil is obtained. According to the magnetic information forming method of the present invention, it is possible to easily form magnetic information that is difficult to forge and falsify on various media using the magnetic information transfer foil of the present invention.

[Brief description of the drawings]

FIG. 1 is a sectional view showing one embodiment of a magnetic information transfer foil of the present invention.

FIG. 2 shows a hysteresis curve of a ferromagnetic material thin film layer.

FIG. 3 is a plan view showing an example of a roughened portion of the magnetic information transfer foil.

FIG. 4 is a cross-sectional view showing a state in which a magnetic information transfer foil is transferred to a transfer medium.

FIG. 5 is a diagram illustrating a magnetic information reading device.

FIG. 6 is a diagram illustrating a method for reading magnetic information.

FIG. 7 is a diagram illustrating a method for reading magnetic information.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Magnetic information transfer foil 11 Base material 12P particle 13 Roughened part 15 Ferromagnetic material thin film layer 17 Release layer 18 Heat seal agent layer or adhesive layer 30 Transfer receiving medium 40 Reader 41 Magnetic head

Continuation of the front page (72) Inventor Daisaku Hanon 1-1-1 Ichigaya-Kaga-cho, Shinjuku-ku, Tokyo F-term in Dai Nippon Printing Co., Ltd. (reference) 2C005 HA02 HB02 HB04 HB07 HB09 HB11 HB13 JB23 JB40 KA03 KA06 KA08 KA15 KA40 KA49 KA61 LA18 LA20 LB18 5B035 AA15 BA05 BB02 BC02 5D006 BA05 BA08 BB06 CB01 CB06 CB07 DA01 EA04 FA07 FA09

Claims (8)

[Claims] 1. A ferromagnetic material is provided on a resin film substrate serving as a support, if necessary, with a roughening portion provided with a roughening ink via a release layer, on the resin film substrate or on the release layer. Providing the thin film layer allows the ferromagnetic material thin film layer to retain a characteristic magnetic information characteristic according to the roughened portion pattern,
A magnetic information transfer foil further comprising a heat sealing agent layer or an adhesive layer formed on the ferromagnetic material thin film layer. 2. The magnetic information transfer foil according to claim 1, wherein a portion having a roughened portion and a portion having no roughened portion are combined so as to give a constant read signal. 3. The center line average roughness Ra of the roughened portion is 1.0
The magnetic information transfer foil according to claim 1, wherein the magnetic information transfer foil has a thickness in a range from μm to 20 μm. 4. The magnetic information according to claim 1, wherein a light reflecting layer is provided between the ferromagnetic material thin film layer or the roughened portion and the resin film base material or the release layer. Transfer foil. 5. The magnetic information transfer according to claim 1, further comprising a shielding layer between the ferromagnetic material thin film layer or the roughened portion and the resin film substrate or the release layer. Foil. 6. The ferromagnetic material thin film layer is formed of an amorphous ferromagnetic material.
The magnetic information transfer foil according to claim 5. 7. A method for forming magnetic information, comprising: transferring the magnetic information transfer foil according to claim 1 to a medium to be transferred. 8. The magnetic information forming method according to claim 7, wherein the magnetic information transfer foil is transferred so as to partially destroy the roughened portion pattern.