JP2001209762A - Magnetic information transfer foil and magnetic information forming method using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic information transfer foil a high in forgery prevention effect and a magnetic information forming method using the foil. SOLUTION: This magnetic information transfer foil 10 is provided with projecting parts 13 formed by printing ink in a pattern shape on a resin film base material 11 being a substrate through or not through a release layer 17 and a ferromagnetic material thin film layer 15 whose coercive force is 0.5 to 50 oersted and whose squareness ration is between 0.75 to 1.0 over the entire surface, makes the ferromagnetic material thin film layer hold a characteristic magnetic information characteristic corresponding to a projecting part pattern and further forms seal agent layer or an adhesive agent layer 16 on the ferromagnetic material thin film layer. The magnetic information forming method transfers such magnetic information transfer foil to a 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 comprising: a convex portion provided with an ink whose surface is roughened; and a ferromagnetic material thin film layer provided on the resin film substrate or on the release layer or the convex portion. The present invention relates to a magnetic information forming method using a magnetic field. Such magnetic information transfer foil can be transferred to a vinyl chloride or PET plastic base material and used as a credit card or a prepaid card, and can be transferred to various printed materials for gift certificates, gift certificates, certificates, passports, Tickets, voting tickets, tickets,
It can be used for various security media such as labels.

[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 higher anti-counterfeit structure, a magnetic plate or the like which is magnetically patterned as a structure combining a convex portion and a magnetic film. I have. 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 problems is to provide a resin film substrate serving as a support, in which convex portions made of printing ink are provided in a pattern, and the resin film is provided. Coercive force of 40 to 40 on base material and projections
A ferromagnetic material thin film layer having a squareness ratio of 0.75 to 1.0 at 00 A / m is provided on the entire surface, and the ferromagnetic material thin film layer has a characteristic magnetic information characteristic corresponding to a convex pattern. And a heat sealing agent layer or an 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.

A second aspect of the present invention for solving the above-mentioned problems is that a convex portion made of printing ink is provided in a pattern on a resin film substrate serving as a support via a release layer, and the release is performed. Coercive force on layer and protrusions is 40-4000 A / m
And a ferromagnetic material thin film layer having a squareness ratio of 0.75 to 1.0 is provided on the entire surface, and the ferromagnetic material thin film layer retains a characteristic magnetic information characteristic according to the convex pattern, Further, there is provided a magnetic information transfer foil, wherein a heat sealing agent layer or an adhesive layer is 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.

A third aspect of the present invention for solving the above problems is that a coercive force is 40 to 4000 A / m and a squareness ratio is 0.75 to 1 on a resin film substrate as a support. .
The ferromagnetic material thin film layer, which is 0, is provided on the entire surface, and convex portions made of printing ink are provided in a pattern on the ferromagnetic material thin film layer. A magnetic information transfer foil characterized in that a magnetic information characteristic is retained and a heat sealant layer or an adhesive layer is further formed on the ferromagnetic material thin film layer. Since the magnetic information transfer foil is used, the magnetic information transfer foil can be transferred to a transfer-receiving medium to prevent a high degree of forgery.

A fourth aspect of the present invention for solving the above problems is that a coercive force of 40 to 4000 A / m and a squareness ratio are formed on a resin film substrate as a support through a release layer. Is provided on the entire surface of the ferromagnetic material thin film layer is 0.75 to 1.0,
On the ferromagnetic material thin film layer, convex portions made of printing ink are provided in a pattern, and the ferromagnetic material thin film layer retains a characteristic magnetic information characteristic according to the convex portion pattern. A magnetic information transfer foil, wherein a heat sealant layer or an adhesive layer is formed on the 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.

[0008] Such a magnetic information transfer foil may have a configuration in which a portion having a convex portion and a portion having no convex portion by printing ink are combined so as to give a constant readout signal. Or, if a light reflecting layer is provided between the convex portion and the resin film substrate or the release layer, the effect of the glittering transfer foil can be given, and if the concealing layer is provided, the magnetic layer can be concealed. . Further, the ferromagnetic material thin film layer can be formed of an amorphous ferromagnetic material.

A fifth 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 forming method, the magnetic information transfer foil can be transferred so as to partially destroy the ferromagnetic material thin film layer. In this case, magnetic information that is more difficult to forge can be formed.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention is directed to a gas-phase method, such as sputtering, in which a projection made of printing ink is provided on a base made of a resin film via a release layer as necessary, and a ferromagnetic material thin film layer is formed on the surface. Or a magnetic information transfer foil having a ferromagnetic material thin film layer formed by a vapor phase method such as sputtering and provided with projections made of printing ink, and a magnetic information forming method using them.

Since the ferromagnetic thin film layer used in the present invention is basically a thin film formed by vapor phase growth such as evaporation or sputtering, the magnetic properties of the thin film are 40 to 4000 A / coercivity.
m (0.5 to 50 Oersted) and a squareness ratio of 0.
In order to obtain a stable value such as 75 to 1.0, the surface of the base material and the surface of the projection must be flat. Therefore, in the present invention, it is premised that a smooth base material is used and a printing ink containing no coarse particles is used in order to make the surface of the printing portion flat.

When a convex portion made of printing ink is formed on a base material made of a resin film, and a ferromagnetic material thin film is formed thereon, the shape of the convex portion formed by the printing ink follows the shape of the convex portion. Then, the magnetic material thin film is formed. The convex portion has a constant thickness from the surface of the base material, and when the surface is made smooth, when the output is measured with a magnetic head, it may be either the front or back surface of the base material. If the signal output ratio is from a certain distance from the surface, the signal output ratio is detected as a difference in output generated in the magnetic head because the distance from the magnetic head is different between the portion having the convex portion and the portion not having the convex portion. The present invention intends to provide certain information to the magnetic information transfer foil using such characteristics. Note that the thickness of the ferromagnetic material thin film is substantially the same under ordinary conditions whether or not there is a projection made of printing ink. When such a ferromagnetic material thin film is measured from, for example, the back surface of the substrate (the surface on which the ferromagnetic material thin film is not provided), the output is large where there is no convex portion, and the output is large where there is a convex portion made of printing ink. Become smaller. The same applies to the measurement from the surface after transfer to the transfer target.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view showing a first embodiment of the magnetic information transfer foil of the present invention. In the case of this embodiment, the magnetic information transfer foil 10 is such that convex portions 13 made of printing ink are formed in a pattern on a base material 11 made of a resin film. The ferromagnetic material thin film layer 15 is provided so as to follow the projection 13. As described above, since the projection 13 has a certain distance Δh from the surface of the base material 11, the magnetic head gives magnetic characteristics with a small squareness ratio by a magnetic head, and the magnetic characteristics with a large squareness ratio in a smooth portion without printing ink. Give and read. When Δh is formed to about 10 μm, if the thickness of the substrate is about 5 to 20 μm, it can be clearly sensed from the substrate surface. In the case of the present invention, the substrate is used after being transferred to a transfer-receiving medium, and the influence of the thickness of the substrate can be ignored since the substrate is peeled off. Here "follow"
When a ferromagnetic material thin film layer is vapor-phase-deposited on a projection made of printing ink, the surface of the thin film is substantially parallel to the shape of the projection, and is continuous without discontinuity in an approximate state. It means that the surface has irregularities. If the surface of the convex portion 13 is a rough surface of several μm or more, the original magnetic characteristics of the magnetic material do not appear, and the magnetic detection signal becomes weak or disappears. Therefore, it is necessary that the ink filler (eg, pigment) used is also fine and has a flat printing surface.

FIG. 2 is a sectional view showing a second 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 release layer 17 provided on a base material 11 made of a resin film, on which projections 13 made of printing ink are formed in a pattern. Other conditions are the same as in the first embodiment. The reason for providing the release layer 17 is to improve the separation between the base material and the printing ink, and when the release property is good without providing the release layer, as in the embodiment of FIG. It is not necessary to provide.

FIG. 3 is a sectional view showing a third 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 ferromagnetic material thin film layer 15 provided on the entire surface of a base material 11 made of a resin film. Has formed. When the transfer foil itself is measured from the substrate 11 surface,
Since the ferromagnetic material thin film layers are at the same distance, the output difference cannot be detected, but when transferred to the medium to be transferred, the heat sealing agent layer or the pressure-sensitive adhesive layer 18 is actually applied with a uniform thickness. The distance from the head to the ferromagnetic material thin film layer is not constant, and the signal output ratio is detected as a difference between the output generated in the magnetic head and the portion having no protrusion.

FIG. 4 is a sectional view showing a magnetic information transfer foil according to a fourth embodiment of the present invention. In the case of this embodiment, the magnetic information transfer foil 10 has a ferromagnetic material thin film layer 15 provided on the entire surface of a base material 11 made of a resin film via a release layer 17, and a printing ink is formed on the layer. The projection 13 is formed in a pattern. The reason for detecting the output difference is the same as in the case of the third embodiment.

FIG. 5 is a sectional view showing another embodiment of the magnetic information transfer foil of the present invention. In the case of this embodiment, a projection 13 made of printing ink and a ferromagnetic material thin film layer 15 are provided via a concealing layer 16. The concealing layer can also serve as a release layer as a releasable material from the substrate 11, but may be provided with a concealment layer via the release layer. FIG.
FIG. 4 is a cross-sectional view showing still another embodiment of the magnetic information transfer foil of the present invention. In the case of this embodiment, the light reflection layer 14
Of the printing ink, the ferromagnetic material thin film layer 1
5 are provided.

In a preferred embodiment of the present invention, as will be described later, the convex portion 13 has a configuration in which there is an existing portion and a non-existing portion. Is to give. Further, on the upper surface of the ferromagnetic material thin film layer 14, a heat sealing agent layer or a pressure-sensitive adhesive layer 18 for heat 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 protrusions 13 and the ferromagnetic material thin film layer 15 to the substrate 11 with releasability, and has a role of protecting the resin layer to some extent after transfer. What you do. 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. In addition, between the release layer 17 and the protrusion 13, the adhesiveness of both layers is increased, and
To increase the durability of the resin layer, an overprint layer may be formed.

The printing ink for forming the printing projections is as follows:
It is preferable that the convex portion can be made a flat surface. It is preferable to include a granular material in order to increase the thickness of the convex portion. Fine particles having a particle size of about 1 μm or less are combined with a binder (resin or the like) and dissolved in a solvent to form an ink.
The ink does not need to be colored as long as it can make the substrate surface convex.

In the present invention, the projections made of the printing ink may be formed so that certain uneven stripes are arranged in a certain direction. However, even in the case of the stripe shape, the diffraction grating effect does not occur because of the coarse pitch provided by printing. The surface of the projection 13 is required to be smooth and the thickness Δh of the projection from the surface of the base material should be such as to give a significant difference to the detected output value. Usually, it may be about 1 μm to 50 μm,
It can be made sufficiently thicker than the thickness of the ferromagnetic material thin film layer 15. However, if the thickness of the ink layer is large, cracks, cracks in the magnetic film, and the like occur, and the measurement is affected, so that the limit is about 50 μm. On the other hand, if it is thinner than 1 μm, a sufficient output signal difference cannot be obtained. More preferably, it is about 5 to 20 μm. It is preferable that the signal output ratio (output ratio of the convex portion / output ratio of the flat portion) when measured from the back surface of the base material at this thickness is about 0.1 to 0.5. If the value is 0.1 or less, the detection signal becomes too weak, and if the value is 0.5 or more, a significant difference from the flat portion may not be detected. However, when used only as a transfer foil as described above, it is not necessary to consider the influence of the thickness of the substrate that peels off. Such printing ink can be printed by intaglio printing such as silk screen printing or gravure.

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, nickel as a main component and an additive element or a mixture thereof. Is formed on the projections by means using the vacuum process. As a ferromagnetic material, cobalt Co-zirconium Z
This is represented by an r-based or iron-Fe-silicon-based system. The thickness of the ferromagnetic material thin film layer is suitably from 50 to 500 nm. The lower limit of the layer is 50 nm or less,
This is because the thickness of the magnetic layer becomes thinner, the saturation magnetic flux decreases with the decrease in the absolute amount of the magnetic body, and the magnetic signal becomes smaller. , 50 nm or more. 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. In view 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 to 30.
0 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 an Hc (coercive force) of 40 to 4000 A.
/ M, Rsq (square ratio) is preferably 0.75 to 1.0. FIG. 7 shows a hysteresis curve of the ferromagnetic material thin film layer.
As shown in (A), the ferromagnetic material thin film layer 15 has a small coercive force Hc and a BH hysteresis curve with a high squareness ratio (0.8 to 1.0). On the other hand, as shown in FIG. 7 (B), the saturation magnetic flux density Bm is reduced and the hysteresis characteristic of a low squareness ratio (0.5 or less) is obtained on the uneven base material surface or the convex portion. The squareness ratio Rsq is represented by Rsq = Br (residual magnetic flux density) / Bm (saturated magnetic flux density).

A non-magnetic metal film can be provided as the light reflecting layer 14 between the ferromagnetic material thin film layer 15 or the projection 13 and the resin film base 11 or the release layer 17. That is, before the release layer is provided, the ferromagnetic material thin film layer 15 or the convex portion 13 made of printing ink is directly provided on the base layer 11 before the release layer is provided. A layer is provided on the entire surface. In such a case, the glossy color of the non-magnetic metal is externally observed as reflected light without being affected by the color of the ferromagnetic thin film after transfer,
A magnetic information transfer foil that is not different from a general glittering transfer foil in appearance is provided. Such a light reflecting layer is made of a reflective non-magnetic metal material, such as gold, silver, aluminum, chrome,
Nickel or the like is used. Generally, aluminum is preferably adopted from the viewpoint of cost and technical problems, and its thickness can be formed to a thickness of about 10 nm to 200 nm.
Preferably, the thickness is about 20 nm to 100 nm.

Similarly to the light reflection layer, the ferromagnetic material thin film layer 15 or the projection 13 and the resin film substrate 11 or the release layer 17
Between them, 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 is printed with a white ink of rutile type titanium oxide having a high concealing effect, simultaneously printing a pattern, or printing with a printing ink containing a concealing pigment such as aluminum powder, silicon oxide, or aluminum deposition. The hiding layer is formed by a method such as printing a white ink after the application. The thickness of the concealing layer can be 1 to several μm.

FIG. 8 is a diagram showing an example of a convex 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, in which the convex portion 13 and the “absent” portion 13n of the convex portion are arranged in the scanning direction of the magnetic head or the length direction of the transfer foil. Are provided with different read magnetic characteristics. In FIG. 8A, the “present” portion 13 and the “not present” portion 13n of the convex 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 convex portion. Therefore, if the “present” portion of the convex portion is “0” and the “absent” portion is “1”, 0, 1,
A repetition signal of 0 and 1 is obtained. FIG.
In (B), the “existing” portion 13 and the “absent” portion 1 of the convex portion are shown.
3n are formed in a periodic pattern that repeats in the order of two and one in the length direction of the transfer foil. If the “existing” portion of the projection 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. 9 is a cross-sectional view showing a state in which the magnetic information transfer foil is transferred to the 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 material thin film layer is partially destroyed by a dry process using a laser beam or a thermal head or the like. For example, YAG laser (irradiation energy several watts, beam diameter 50 μm) (wavelength 1064 nm)
In the case of scanning at a speed of 100 mm / sec by using, 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. 10 is a diagram for explaining a reading device. FIG. 10A shows that the magnetic head 41 is AC-excited (5
10 to 10 kHz, 2 to 5 Vpp), the output voltage is detected by the detection coil 43, and FIG.
3 shows a case where the output waveform of FIG. 3 (FIG. 10C) is compared for detection. 11 and 12 are diagrams for explaining a method for reading magnetic information. FIG. 11A shows an input AC waveform in the device of FIG. 10A, and FIG. 11B shows an 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, the pulse signal shown in FIG. 11C is obtained. The authenticity can be determined by looking at the peak height, half width, position, and frequency component of the pulse. FIG.
In the case of comparison with the output of the reference electrode in the device shown in FIG.

When 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, and the signal intensity at the convex portion decreases and the half-value width increases (FIG. 12B). When this transfer portion is scanned by a magnetic head, the signal waveform shown in FIG. 12C is shown.
It can be read as a signal of 1, 0,.

[0034]

EXAMPLES Examples 1 to 3 and Comparative Example 1 of the present invention will be described below with reference to the drawings. In Examples 1 and 2, when the order of the printing ink and the ferromagnetic material thin film layer was changed,
Shows a case where a light reflecting layer is added to Example 1, and Comparative Example 1 shows a case where the particle size of the granular material in Example 1 is coarse.
Therefore, the substrate used in Example 2 and below, formation of the release layer, printing conditions of the printing ink, formation of the ferromagnetic material thin film layer,
The conditions for forming the heat sealant layer are the same as those in Example 1.

Example 1 <Preparation of Magnetic Information Transfer Foil> As the resin film substrate 11 of the magnetic information transfer foil, a smooth and transparent polyethylene terephthalate film (“Lumirror 25” manufactured by Toray Industries, Inc.)
T60 ”) [thickness: 25 μm], in order to give releasability, a methyl methacrylate-based acrylic resin was diluted in toluene and applied as a thin release layer 17 by gravure printing.

Subsequently, stripe-shaped protrusions having a width of 2 mm were printed with a printing ink having the following composition by a gravure printing method and dried. The thickness Δh of the protrusion after drying was set to 7 μm. In addition, as shown in FIG. 8A, when the protruding portion is cut into the transfer foil, the “absent” portion 13n of the protruding portion and the “present” portion of the protruding portion 13 are arranged in the length direction of the transfer foil. Printed to be repeated. [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)

Subsequently, a ferromagnetic material thin film layer 15 made of iron-Fe-Si is formed on the convex portions and on the surface of the resin film substrate having no convex portions by a sputtering method to a thickness of 0.2 μm.
m was formed on the entire surface.

Example 2 <Preparation of Magnetic Information Transfer Foil> As in Example 1, the same substrate was coated with a release layer 17 under the same conditions. Next, a ferromagnetic material thin film layer 15 is formed on the entire surface under the same conditions as in the first embodiment.
Further, a convex portion was provided using the same printing ink as in Example 1 under the same conditions as in Example 1.

Example 3 <Preparation of Magnetic Information Transfer Foil> As in Example 1, the same base material was coated with a release layer 17 under the same conditions, and was further raised with a printing ink having the same composition. The parts were provided under the same conditions as in Example 1. Next, the light reflection layer 14 was formed to a thickness of 30 nm by a deposition film of Al. Thereafter, the projections were provided under the same conditions as in Example 1 using a printing ink having the same composition as in Example 1, and a ferromagnetic material thin film layer 15 was formed on the entire surface under the same conditions as in Example 1.

(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 was further coated with a printing ink having the following composition. Protrusions were provided under the same conditions as in Example 1, and a ferromagnetic thin film layer 15 was formed on the entire surface 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

The magnetic properties of the magnetic information transfer foils of Examples 1 to 3 and Comparative Example 1 before applying the heat sealing agent were measured from the back surface of the substrate. As a result, the squareness ratio and the coercive force of the convex portion 13 and the smooth portion having no convex portion by the printing ink were as shown in the following table. Example 1 Example 2 Example 3 Comparative Example 1 Convex portion squareness ratio 0.8 0.85 0.87 0.4 Convex portion coercive force (A / m) 1200 1200 1200 1200 2400 Smooth portion squareness ratio 0.9 0.9 0.92 0.9 Smooth portion coercive force (A / m) 800 800 800 800 Note that the squareness ratio is measured by a DC magnetic field of a VSM (sample vibrating magnetometer). The same result was obtained by the measurement by. The coercive force was measured by a BH analyzer (manufactured by Iwasaki Communication Equipment Co., Ltd.). The unit of the coercive force is A / m. It should be noted that the fact that the squareness ratio is remarkably reduced in Comparative Example 1 is due to the effect of the roughening of the convex portion.

<Transfer to Transferred Media> A 1 μm thick polyvinyl chloride-based hot-melt 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 stripes of the projections. Then, as shown in FIG. 9, the magnetic information transfer foils of Examples 1 to 3 and Comparative Example 1 were heated to 135 ° C. and 0.7 ° Transfer for 2 seconds. that time,
The substrate 11 was peeled off from the release layer 17 and removed.

The magnetic characteristics after the magnetic information transfer foils of Examples 1 to 3 and Comparative Example 1 were transferred to a vinyl chloride card were measured. As a result, no change was observed in the characteristics before transfer.

As a result of the above, it is generally recognized that the convex portions have a low squareness ratio, and the magnetic readability is reduced. It was observed that the effect of the conversion was reduced. However, when the added particulate matter becomes coarse, the squareness ratio is reduced, but it is considered that it is difficult to form an ink or print.

[0045]

Since the magnetic information transfer foil of the present invention has the above-described structure, it can provide a unique magnetic information characteristic, and has a counterfeiting prevention effect that cannot be obtained with a normal magnetic transfer foil or glitter transfer foil. Have. 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 a magnetic information transfer foil according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing a magnetic information transfer foil according to a second embodiment of the present invention.

FIG. 3 is a sectional view showing a third embodiment of the magnetic information transfer foil of the present invention.

FIG. 4 is a sectional view showing a fourth embodiment of the magnetic information transfer foil of the present invention.

FIG. 5 is a sectional view showing another embodiment of the magnetic information transfer foil of the present invention.

FIG. 6 is a cross-sectional view showing still another embodiment of the magnetic information transfer foil of the present invention.

FIG. 7 shows a hysteresis curve of the ferromagnetic material thin film layer.

FIG. 8 is a diagram showing an example of a convex portion of a magnetic information transfer foil.

FIG. 9 is a cross-sectional view showing a state in which a magnetic information transfer foil is transferred to a transfer medium.

FIG. 10 is a diagram illustrating a magnetic information reading device.

FIG. 11 is a diagram illustrating a method for reading magnetic information.

FIG. 12 is a diagram illustrating a method for reading magnetic information.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Magnetic information transfer foil 11 Base material 13 Convex part 14 Light reflection layer 15 Ferromagnetic material thin film layer 16 Concealment layer 17 Release layer 18 Heat seal agent layer or adhesive layer 30 Transfer medium 40 Reading device 41 Magnetic head

Continuation of the front page (51) Int.Cl. ⁷ Identification code FI Theme coat II (reference) G06K 19/10 G11B 5/80 5D112 G11B 5/65 5/84 Z 5/80 G06K 19/00 B 5/84 R ( 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 HB09 HB11 HB13 JA03 JB23 KA15 KA37 3B005 EA07 EB01 EC26 FA04 FB01 FB12 5B035 AA13 BA03 BA05 BB02 BC02 5B058 CA31 KA31 KA32 5D006 AA01 AA06 BB01 BB07 CA01 CA06 DA01 FA00 5D112 AA28 HH08

Claims (10)

[Claims] 1. A convex portion made of printing ink is provided in a pattern on a resin film substrate serving as a support, and a coercive force is 40 to 4000 A / m on the resin film substrate and the convex portion.
And a ferromagnetic material thin film layer having a squareness ratio of 0.75 to 1.0 is provided on the entire surface, and the ferromagnetic material thin film layer retains a characteristic magnetic information characteristic according to the convex 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. A convex portion made of printing ink is provided in a pattern on a resin film base material serving as a support via a release layer, and a coercive force of 40 to 4000 is formed on the release layer and the convex portion.
A / m and a ferromagnetic material thin film layer having a squareness ratio of 0.75 to 1.0 are provided on the entire surface, and the ferromagnetic material thin film layer has a characteristic magnetic information characteristic corresponding to a convex pattern. A magnetic information transfer foil, wherein the heat-sealing agent layer or the pressure-sensitive adhesive layer is formed on the ferromagnetic material thin film layer. 3. A coercive force of 40 to 4000 A / m and a squareness ratio of 0.75 on a resin film substrate as a support.
A ferromagnetic material thin film layer having a thickness of ~ 1.0 is provided on the entire surface, and convex portions made of printing ink are provided in a pattern on the ferromagnetic material thin film layer, and the ferromagnetic material thin film layer conforms to the convex portion pattern. A magnetic information transfer foil characterized in that a characteristic magnetic information characteristic is maintained, and a heat sealing agent layer or an adhesive layer is formed on the ferromagnetic material thin film layer. 4. A ferromagnetic material thin film having a coercive force of 40 to 4000 A / m and a squareness of 0.75 to 1.0 via a release layer on a resin film substrate serving as a support. A layer is provided on the entire surface, on the ferromagnetic material thin film layer, a convex portion made of printing ink is provided in a pattern, and the ferromagnetic material thin film layer retains a characteristic magnetic information characteristic according to the convex 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. 5. The magnetic information according to claim 1, wherein a portion having a convex portion and a portion having no convex portion formed by printing ink are combined so as to give a constant readout signal. Transfer foil. 6. The magnetic information transfer according to claim 1, further comprising a light reflection layer between the ferromagnetic material thin film layer or the projection and the resin film substrate or the release layer. Foil. 7. The magnetic information transfer foil according to claim 1, further comprising a concealing layer between the ferromagnetic material thin film layer or the projection and the resin film substrate or the release layer. . 8. The ferromagnetic material thin film layer is formed of an amorphous ferromagnetic material.
The magnetic information transfer foil according to claim 7. 9. A method for forming magnetic information, comprising: transferring the magnetic information transfer foil according to claim 1 to a medium to be transferred. 10. The method according to claim 9, wherein the magnetic information transfer foil is transferred so as to partially destroy the ferromagnetic material thin film layer.