JPH07110852A - Non-contact magnetic card - Google Patents

Abstract

PURPOSE:To improve the output of a high order harmonic wave and its sharpness and to easily identify many kinds of waves by constituting a magnetic layer so that magnetic powder having saturated magnetic flux density more than a specific value are dispersed into a binder in the magnetic layer. CONSTITUTION:A base material C consists of a sheet 6' notched so as to hold space in which a ductile stripe 2 consisting of a ferro-magnetic magnetic distortion material can be mechanically resonated and a sheet 6 having no notch and is allowed to store the stripe 2 by sticking the material C to a non-magnetic backing B forming a magnetic layer 4 on its surface. Since the layer 4 is formed so as to control the intensity of a magnetic field in the thickness distance of the backing B, the saturated magnetic flux density of magnetic powder in the layer 4 is preferably set up to >100emu/g, an especially preferable value is >120emu/g. Thereby the resonance frequency of the ductile stripe 2 can be controlled by the use of a digital magnetic recording system and the volume of recording information can be increased by using plural stripes 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic card, and more particularly to a non-contact magnetic card for reading identification information such as collation data, which can also be used for forgery prevention.

[0002]

2. Description of the Related Art Magnetic cards are bank cash cards,
It is widely used for passbooks, railway commuter passes, and tickets, but it is mechanically worn and damaged because it is read by contact. As a non-contact type and simple information medium, a bar code system is generally used, but there are problems such as a use environment and difficulty in writing. Therefore, Japanese Patent Laid-Open Nos. 58-192197 and 6
No. 0-218223, etc., a ductile stripe of a plurality of ferromagnetic magnetostrictive materials adjusted so that a bias magnetic field is applied by a hard magnetic material to an incident AC magnetic field having a frequency that fluctuates in the detection region is selected in advance. Magnetic markers that mechanically resonate at different frequencies have been proposed. Further, WO (International Patent Application Publication) 92/1
No. 2401 and WO92 / 12402, a ductile stripe of a single ferromagnetic magnetostrictive material adjusted so that a plurality of bias magnetic fields are applied by devising the magnetization state of a hard magnetic material can be machined at different frequencies. A magnetic marker that resonates mechanically has been proposed.

[0003]

The basic structure of the above-mentioned magnetic marker is, as shown in FIG. 1, a rectangular stripe having a ferromagnetic magnetostrictive material and a storage space for mechanical resonance of the ductile stripe. It consists of a tray case and a ribbon of hard magnetic material that forms the lid of the rectangular tray case. As the hard magnetic material, a ferromagnetic alloy such as SAE1095 steel, Vicalloy, Remalloy, Arnochrome, and Clovac is used. When the rectangular tray case is made of plastic, which is a polymer material such as polyethylene, the fixing method is difficult because the thin ribbon of the hard magnetic material is metal, and it is optimally biased to the ductile stripes of a plurality of ferromagnetic magnetostrictive materials. It must be adjusted to apply a magnetic field and accurately dimensioned. Therefore, Japanese Patent Laid-Open No. 62-64725 discloses an improved bias for a housing made of plastic filled with magnetic powder having a high coercive force such as barium ferrite that generates a bias magnetic field similar to a solenoid for a ductile stripe. Proposed. However, such a housing cannot be used because the bias magnetic field described in WO92 / 12401 by Daems et al. Is not solenoid-like and generates a plurality of bias magnetic fields.
In addition, the method introduced in WO92 / 12401 and the like, for example, uses a "Delrin" (trademark) in a rectangular tray case.
Adhesive tape is used to fix the thin metal strip of ferromagnetic alloy, which is a hard magnetic material, using plastics such as. Then, as a method of applying magnetization to generate a plurality of bias magnetic fields from a hard magnetic material, a general magnetic recording method using a magnetic head is used. This recording method uses a sine wave recording method. Further, since the orientation of the metal ribbon of the hard magnetic material is low and the reproduced waveform is broken, recording by the digital magnetic recording system cannot be performed. Since the adhesive tape is interposed between the magnetic head and the hard magnetic material, the thickness of the adhesive tape is generally 60 μm and the thickness of the hard magnetic material is at least 30 μm. Magnetic flux lines must be generated up to a position of 100 μm or more from the magnetic head, which makes it considerably difficult to magnetize. Further, since the thickness of the hard magnetic material is generally a metal forming process, there is a problem that the variation of the film thickness is at least ± 5 μm and the magnitude of the generated bias magnetic field is not stable. Next, considering industrialization, the processing of hard magnetic materials is more difficult to handle due to their brittleness,
The use of adhesive tape has a low commercial value and cannot be manufactured. Furthermore, JIS such as so-called credit cards
It was not possible to make the specification based on the standard the thickness of 0.6 to 0.8 mm.

An object of the present invention is to provide a non-contact magnetic card having a thickness conforming to the JIS standard, such as a credit card, which uses a magnetic layer suitable for a digital recording system and excellent in workability. is there.

[0005]

As a result of intensive studies to solve the above problems, the inventors of the present invention have solved the above problems.

That is, in order to solve the above-mentioned problems, the present invention has a magnetic layer having magnetic information recorded on one surface of a non-magnetic support and a bias magnetic field from the magnetic layer on the other surface. A magnetic layer having a ductile stripe of a ferromagnetic magnetostrictive material that is mechanically resonant at a preselected frequency corresponding to the magnetic information, for an incident alternating magnetic field having a given and varying frequency within the detection region. The present invention provides a non-contact magnetic card, which is a magnetic layer in which magnetic powder having a saturation magnetic flux density of 70 emu / g or more is dispersed in a binder.

In the non-contact magnetic card of the present invention, for example, a base material containing a ductile stripe of a ferromagnetic magnetostrictive material is bonded to a non-magnetic support provided with a magnetic layer by using an adhesive as necessary. Can be manufactured by.

Materials usable as the non-magnetic support in the present invention include, for example, polyethylene, polypropylene, polyvinyl chloride, polyvinylidene chloride, polyethylene naphthalate, polyvinyl alcohol, polyethylene terephthalate, polycarbonate, nylon, polystyrene, ethylene acetic acid. A plastic film or sheet made of a vinyl copolymer, an ethylene vinyl copolymer, or the like; or a nonmagnetic metal such as aluminum; paper, impregnated paper; a composite made of these materials, and other materials However, as long as it has the required strength and structure, it can be used without particular limitation.

Since the magnetic layer used in the present invention is intended to control the magnitude of the magnetic field strength over the distance of the thickness of the non-magnetic support, the saturation magnetic flux density of the magnetic powder in the magnetic layer is 100 emu / mu. g or more is preferable, and 120 emu / g or more is particularly preferable.

Examples of the magnetic powder include compound-based ferromagnetic powders such as iron carbide and iron nitride. As the ferromagnetic metal powder, the metal content in the ferromagnetic powder is 75% by weight or more, and 80% by weight or more of the metal content is at least one type of ferromagnetic metal or alloy (for example, Fe, Co, Ni, Fe-Co, Fe-N
i, Co-Ni, Co-Ni-Fe), and other components (for example, A
l, Si, Pb, Se, Ti, V, Cr, Mn, Cu,
B, Y, Mo, Rh, Rd, Ag, Sn, Sb, P, B
a, Ta, W, Re, Au, Hg, S, Bi, La, C
Examples include alloys containing e, Pr, Nd, Zn, Te). The ferromagnetic metal component may include a small amount of water, hydroxide or oxide. Methods for producing these ferromagnetic powders are known, and in the present invention, those produced according to known methods can be used.

As the binder used in the magnetic layer, a vinyl chloride-vinyl acetate copolymer, vinyl chloride and a copolymer of vinyl acetate and vinyl alcohol, maleic anhydride or acrylic acid, vinyl chloride-vinylidene acetate copolymer are used. Copolymers, vinyl chloride-acrylonitrile copolymers, vinyl chloride copolymers such as vinyl chloride copolymers having polar groups such as sulfonic acid groups or amino groups; cellulose derivatives such as nitrocellulose; polyvinyl acetal resins;
Acrylic resins; polyvinyl butyral resins; epoxy resins; phenoxy resins; polyurethane resins; polyester polyurethane resins; polyurethane resins having polar groups such as sulfonic acid groups and polycarbonate polyurethane resins.

Although the resin used as the binder may be used alone, it may be used as a binder such as vinyl chloride resin and polyurethane resin, or cellulose derivative and polyurethane resin.
It is also possible to use a combination of more than one type of resin.
The amount of the binder used is 15 to 3 per 100 parts by weight of the magnetic powder.
A range of 0 parts by weight is preferred.

Examples of the dispersant used in the magnetic layer include lecithin, higher alcohols, silane coupling agents, titanium coupling agents and surfactants. The amount of these dispersants used is 0.5 per 100 parts by weight of the magnetic powder.
The range of up to 3.0 parts by weight is preferred.

A magnetic coating material is prepared by using the above magnetic powder, binder and dispersant in various kneading and dispersing machines. In kneading / dispersing, all of the above-mentioned components are simultaneously or individually charged into a roll-type kneader such as a two-roll or three-roll type, or a disperser such as a ball-type rotary mill. The prepared magnetic paint is applied to a non-magnetic support, and 1000 to 1
A magnetic layer is formed by performing a magnetic field orientation treatment with a permanent magnet or a solenoid magnet having a magnetic field strength of 0000 Gauss and then drying. At this time, the magnetic layer may be calendered.

The magnetic coating material may be applied by, for example, air doctor coating, blade coating, rod coating,
Examples thereof include extrusion coating, air knife coating, squeeze coating, impregnation coating, reverse roll coating, transfer roll coating, gravure coating, kiss coating, cast coating and spray coating.

Next, FIG. 4 shows a case where the thickness of the magnetic layer used in the present invention is increased.

There is a limit to increase the thickness of the magnetic layer by the method of applying the magnetic coating on the non-magnetic support,
In the case of obtaining a magnetic layer having a thickness of 40 μm or more, the adhesive layer 7 may be provided, and the two magnetic layers may be compounded by stacking the non-magnetic support provided with the magnetic layer. In such a case, one of the nonmagnetic supports B'can be used as a protective layer.

Examples of the adhesive used for the adhesive layer 7 include vinyl chloride-vinyl acetate copolymer, ethylene-vinyl acetate copolymer, vinyl chloride-propionic acid copolymer,
A rubber resin, a cyanoacrylate resin, a cellulose resin, an ionomer resin, a polyolefin resin, a polyurethane resin and the like can be mentioned, and they are usually formed to a thickness of 0.1 to 0.5 μm.

As a method of bonding, for example, two non-magnetic supports B and B'are heated and pressed to bond them. Specifically, a pair of metal rolls or rubber rolls are installed facing each other, and one roll is heated,
It can be carried out by bringing it into contact with one of the non-magnetic supports B and heating and pressurizing by the pressure between the rolls and the heat of the rolls, or by using a hot press. The conditions for heating and pressurization varies depending on the material used, an example, the temperature is 100 to 300 ° C., about 10 kg / cm ² pressure is a thermal roll method, a hot press method 10 kg / cm ² before and after, A speed of about 50 m / min is suitable.

A protective layer may be provided on the magnetic layer, and the resin used for the protective layer is, for example, a cellulose derivative such as ethyl cellulose or cellulose acetate, a styrene resin such as polystyrene or a styrene copolymer resin,
Acrylic resin or methacrylic resin homopolymer or copolymer resin such as polymethylmethacrylate, polyethylmethacrylate, polyethylacrylate, polybutylacrylate, polyvinyl acetate, vinyltoluene resin, vinyl chloride resin, polyester resin, polyurethane resin , Butyral resin, and the like. In addition, a medium in which a high hardness additive such as α-Al ₂ O ₃ or fine resin beads such as polytetrafluoroethylene (PTFE) is dispersed in the resin to improve wear resistance is used. Good.

As a method for forming the protective layer, a known coating method may be used, and examples thereof include an air doctor coat, a blade coat, a rod coat, an extrusion coat, an air knife coat, a squeeze coat, an impregnation coat and a reverse roll coat. Examples include transfer roll coat, gravure coat, kiss coat, cast coat, spray coat and the like.

The thickness of the magnetic layer is preferably in the range of 10 to 100 μm, and the residual magnetic flux density per unit area is 1 to 25.
It is desirable to be in the range of Mx / cm.

When the magnetic layer is magnetized, its magnetization point, that is, the magnetic field strength generated from its polar point is determined by the distance between the polar point and the measurement point, and decreases as the distance increases. Further, it is desirable that the ductile stripe of the ferromagnetic magnetostrictive material has a thickness and a bias magnetic field is uniformly applied from the magnetic layer.

Since the magnetic layer and the ductile stripe of the ferromagnetic magnetostrictive material have a particularly large decrease in the magnetic field in the vicinity of the surface of the magnetic layer and the ductile stripe of the ferromagnetic magnetostrictive material has a thickness, they should not be in direct contact with each other. It is necessary to make contact with an optimum interval, and this interval becomes the thickness of the non-magnetic support. Furthermore, the non-magnetic support is a support for the magnetic layer and at the same time protects the ductile stripes of the ferromagnetic magnetostrictive material, and requires an appropriate thickness. The thickness of the non-magnetic support is preferably 10 to 250 μm, particularly 2
It is preferably 5 to 100 μm. Therefore, the thickness of the magnetic layer can be obtained by determining the thickness of the non-magnetic support and the preferable bias magnetic field strength.

As the ductile stripe of the ferromagnetic magnetostrictive material, for example, "Metgrass 26 manufactured by Allied Chemical Co., Ltd.
Product numbers such as "05SC", "Methograss 2605CO", and "Methograss 2826MB" are desirable, and the thickness thereof is preferably 15 to 25 µm, and the form may be linear.

The ductile stripe of ferromagnetic magnetostrictive material is provided with a bias field from the magnetic layer. The magneto-mechanical coupling coefficient of the ductile stripe of the ferromagnetic magnetostrictive material changes depending on the magnitude of the bias magnetic field, and increases at the maximum magnetostriction change rate. That is, when a bias magnetic field is applied, the magneto-mechanical coupling coefficient increases as the magnetic field increases, showing a maximum at a certain bias magnetic field and then decreasing.

The magnetomechanical coupling coefficient K is defined by the following equation (1), is a function of effective magnetic permeability, and is measured by the mutual inductance method which is a method of measuring effective magnetic permeability. The greater the magnetomechanical coupling coefficient, the greater the conversion energy efficiency that causes mechanical resonance at the natural frequency of the ductile stripe of ferromagnetic magnetostrictive material when an alternating magnetic field with varying frequencies is applied.

[0028]

[Equation 1]

(In the above formula, E ₁ represents mechanically stored energy, and E ₂ represents magnetically applied energy.)

Therefore, at the natural frequency of the ductile stripe of the ferromagnetic magnetostrictive material, an optimum bias magnetic field is required to obtain a magnetomechanical coupling coefficient that is as large as possible, and the ductile stripe of the ferromagnetic magnetostrictive material has a uniform bias. If a magnetic field is not applied, magnetic energy is not efficiently converted into mechanical energy.

Further, the resonance frequency f _n is _expressed by the following equation (2).

[0032]

F _n = (n / 2L) (E / D) ^1/2 (2)

(In the above formula, L, E, and D respectively represent the stripe length, Young's modulus, and mass density of the ferromagnetic magnetostrictive material, and n represents the harmonic order.)

As shown by the equation (3), when the order of the harmonic of n becomes higher, the resonance frequency inevitably exceeds 1 MHz. The ductile stripe of ferromagnetic magnetostrictive material has a coercive force of 0.5
It is below Oersted, but due to the high residual magnetic flux density,
Hysteresis loss, which is high frequency loss, cannot be ignored. Further, the ductility stripe of the amorphous ferromagnetic magnetostrictive material has a small electric resistivity of 120 to 140 μΩ-m, and the eddy current loss cannot be ignored. Therefore, it is desirable that the hysteresis loss at the resonance frequency is as low as possible, and the range of 1 to 50 J / m ³ is particularly preferable in an alternating magnetic field having a frequency of 1 KHz and a maximum magnetic field strength of 5 oersteds.

The substrate C used in the present invention is, as shown in FIG. 3, a sheet 6'in which a cut is made so as to maintain a space in which the ductile stripe 2 of the ferromagnetic magnetostrictive material can mechanically resonate, The sheet 6 without cuts is attached to the non-magnetic support B provided with the magnetic layer 4 to store the ductile stripe 2 of the ferromagnetic magnetostrictive material.

Examples of the material of the sheets 6 and 6'include plastics such as polyvinyl chloride, nylon, cellulose diacetate, polystyrene, polyethylene, polypropylene, polyester, polyimide or polycarbonate; or metals such as aluminum; paper;
Impregnated paper; a composite of each of these materials can be used, and other than these, any one can be used without particular limitation as long as it has necessary strength, constitution, concealing property, and light opacity. Sheets 6 and 6'are preferably light impermeable so as to mask the presence of ductile stripes 2.

An adhesive may be used to bond the non-magnetic support and the sheet, and examples of the adhesive to be used include vinyl chloride-vinyl acetate copolymer, ethylene-vinyl acetate copolymer and vinyl chloride. -Propionic acid copolymer, rubber-based resin, cyanoacrylate resin, cellulose-based resin, ionomer resin, polyolefin-based resin, polyurethane resin and the like can be mentioned.
It is formed to a thickness of 1 to 0.5 μm.

As a method of bonding, for example, a non-magnetic support provided with a magnetic layer and sheets 6 and 6'having ductile stripes of a ferromagnetic magnetostrictive material are heated and pressed to be bonded. For example, a pair of metal rolls or rubber rolls are installed facing each other, one roll is heated and brought into contact with one sheet 6 side, and the other sheet 6 ′ is bonded by the pressure between the rolls and the heat of the rolls. Or can be done using a hot press. The heating and pressurizing conditions vary depending on the material used, but for example, the temperature is 100 to 300 ° C., and the pressure is about 10 in the hot roll method.
kg / cm ^2, a hot press method 10 kg / cm ² before and after, as the speed is appropriate about 50 m / min.

The thickness of the substrate C is not particularly limited as long as the ductile stripe 2 of the ferromagnetic magnetostrictive material can hold a space in which it can mechanically resonate. For example, J
According to the standard for IS credit card with magnetic stripe, etc., the thickness is 0.68 to 0.80 and the long side is 85.7 m.
m and the short side of 54.03 mm, it is possible by using a polyester film of 250 μm as the base material.

Next, in the non-contact magnetic card of the present invention, it is necessary to record magnetic information on the magnetic layer when using it.
Hereinafter, a method of magnetizing the magnetic layer and the accompanying effect of the ferromagnetic magnetostrictive material on the ductile stripe will be described.

The natural frequency at which the ductile stripe of the ferromagnetic magnetostrictive material mechanically resonates is represented by the equation (2), and the magnetic field which generates the bias magnetic field applied to the ductile stripe of the ferromagnetic magnetostrictive material which resonates with respect to the incident AC magnetic field. The magnetized state of the layers is shown in FIG.

FIG. 5 shows a state in which magnetic information is recorded on the magnetic layer used in the present invention, that is, a state in which a magnetic layer having a length L is magnetized into n equal parts.

For magnetic recording, the magnetizer shown in FIG. 6 or the encoder shown in FIG. 7 can be used. Alternatively, a longitudinal recording or ring type head may be used.

There are two magnetic recording methods, the sine wave recording method shown in FIG. 8 and the digital recording method shown in FIG. 9, but the range of the bias magnetic field at which the magnetomechanical coupling coefficient is maximum is narrow. , L / n, the digital recording method is preferable because a stable and sharp bias magnetic field can be generated.

The resonance frequency fn has been described above.
It is also possible to superimpose the magnetization content so as to generate a plurality of resonances. Generating a plurality of resonances significantly improves the type of discrimination based on the combination.

In order to generate two modes of resonance at the resonance frequencies fn and fm, a sinusoidal wave having a half wavelength of L / n where the amplitude of the ductile stripe edge of the ferromagnetic magnetostrictive material is 0 and L / m are used. Resonances fn and fm can be obtained by digitally magnetizing so that a bias magnetic field is generated at a length where the amplitude of a curve obtained by combining sine waves having a half wavelength is zero. In this case, resonance other than fn and fm may be obtained, but the amplitudes of the sine wave having a half wavelength of L / n and the sine wave having a half wavelength of L / m must be adjusted. Gives a resonance of only fn and fm. Further, in order to generate resonance at the resonance frequencies fn, fm and fl, L / n
A sine wave having a half wavelength of L / m, a sine wave having a half wavelength of L / m, and a sine wave having a half wavelength of L / l Resonances fn, fm, and fl can be obtained by digitally magnetizing as in the above two modes so that a bias magnetic field is generated at the place.

FIG. 10 shows a system for detecting identification information corresponding to magnetic recording of the non-contact magnetic card of the present invention.

The apparatus 100 includes an oscillator 101 for generating a sinusoidal signal capable of sweeping a frequency, an output amplifier 102 for amplifying the sinusoidal signal, and the ductility of a ferromagnetic magnetostrictive material due to the shape of the amplified sinusoidal signal. It consists of an exciting coil 103 that can apply an alternating magnetic field to the stripe.

The apparatus 200 comprises a pickup coil 201 coaxially arranged inside the exciting coil 103 and a spectrum analyzer 202 capable of measuring the frequency at which a ductile stripe of a ferromagnetic magnetostrictive material mechanically resonates to measure the amplitude of a response signal. Consists of. By previously magnetizing the magnetic layer of the non-contact magnetic card of the present invention using an encoder or the like, the ferromagnetic magnetostrictive material resonates at the frequency of formula (2).

Therefore, sweeping the frequency of the alternating magnetic field around f _n produces a characteristic signal. This is because when an alternating magnetic field and a bias magnetic field are introduced into a ductile stripe of ferromagnetic magnetostrictive material exhibiting magnetostriction, energy is alternately stored and released in magnetic energy and mechanical energy depending on the frequency of the alternating magnetic field. The stored and released magnetostrictive energy is maximum at the material's mechanical resonance frequency. Due to the accumulation and release of this energy, a voltage is induced in the pickup coil 201 via the permeability of the ductile stripe of the ferromagnetic magnetostrictive material, that is, the change in the magnetic flux density. Therefore, the identification information of the non-contact magnetic card of the present invention is determined by detecting the specific frequency component of the output signal induced in the pickup coil 201.

The frequency of the oscillator 101 is 10 kHz to 5 MHz.
The range of is desirable. The strength of the alternating magnetic field generated in the exciting coil 103 is 5 Oersted or less, and the magnetic field of this level does not erase or attenuate the recorded information in the magnetic layer of the present invention.

[0052]

EXAMPLES The present invention will be described in more detail below with reference to examples.

Example 1 Fe—Ni— with a thickness of 25 μm
Mo-B type "Metgrass 2826MB" (Allied
(Manufactured by Chemical Co., Ltd.) having a width of 2 mm and a length of 100 mm was masked with an etching resist, and an etching treatment was performed to prepare a ductile stripe of a ferromagnetic magnetostrictive material.

The ductile stripe of this ferromagnetic magnetostrictive material is
AC magnetic characteristics were measured with an AC magnetization measuring device (manufactured by Riken Denshi Co., Ltd.) under an excitation condition of a frequency of 1 KHz and a maximum magnetic field strength of 5 Oersted, and are shown in Table 2 and FIG. Further, the magnetomechanical coupling coefficient when a bias magnetic field was applied was measured by the mutual inductance method, and shown in FIG.

A milky white polyethylene terephthalate plate having a thickness of 250 μm was used as a sheet constituting a base material,
A window with a width of 3 mm and a length of 102 mm is opened in it, and another thickness of 25
A 0 μm milk-white polyethylene terephthalate plate was adhered and inserted so that the ductile stripes of the ferromagnetic magnetostrictive material could be mechanically resonated to prepare a substrate containing the ductile stripes of the ferromagnetic magnetostrictive material.

Next, "HJ-" which is a metal magnetic powder having a coercive force of 1550 Oersted and a saturation magnetic flux density of 120 emu / g.
8 "(manufactured by Dowa Mining Co., Ltd.), 3 parts by weight of lecithin, 10 parts by weight of vinyl chloride-vinyl acetate-vinyl alcohol copolymer" VAGH "(manufactured by Union Carbide Company, USA), polyurethane elastomer" T-5206 ". (Dainippon Ink and Chemicals Co., Ltd.) 10 parts by weight are kneaded by a pressure kneader, 300 parts by weight of an equal weight mixture of methyl ethyl ketone, toluene and cyclohexanone is added to the obtained kneaded product, and dispersed by a ball mill. Then, a magnetic paint was obtained.

The obtained magnetic paint was applied onto a polyester film having a thickness of 50 μm to give a dry coating film thickness of 12.5 μm.
m, 30 μm, apply a magnetic field orientation of 5000 gauss and dry, then slit to a width of 10 mm,
A non-magnetic support provided with a magnetic layer was prepared. Further, the magnetic coating composition was applied on a polyester film having a thickness of 50 μm so that the dry coating film thickness was 30 μm, and the dry coating film thickness was 1 on a polyester film having a thickness of 24 μm.
The coating was applied so as to have a thickness of 0 μm, a magnetic field orientation of 5000 gauss was applied and dried, and the slits each having a width of 10 mm were stuck together to prepare a nonmagnetic support provided with a magnetic layer having a thickness of 40 μm. Then, their magnetostatic properties were measured, and the results are shown in Table 1.

Next, the base material and the non-magnetic support provided with the magnetic layer are bonded together by using a hot press machine so that the ductile stripe of the ferromagnetic magnetostrictive material and the magnetic layer overlap each other, and then 5
The non-contact magnetic card of the present invention was obtained by punching into a size of 105 mm.

Then, in a non-contact magnetic card having a magnetic layer thickness of 40 μm, sixth-order harmonic waves, twelfth-order harmonic waves, and twentieth-order harmonic waves are generated from the end faces of the ductile stripes of the ferromagnetic magnetostrictive material. , 100/6 mm, 100/12
It was magnetized with an encoder so that the magnetization would be saturated at 100 mm and 100/20 mm intervals. Further, the reproduction output was measured with a reader using a normal magnetic head, and the results are shown in FIGS. 12 and 16. Further, the bias magnetic field generated from the surface of the ferromagnetic magnetostrictive material in contact with the ductile stripe was measured using a Gauss meter and is shown in Table 1.

Next, as shown in FIG. 10, a system for detecting the identification information corresponding to the magnetic recording of the non-contact magnetic card was prepared.

A core having an inner diameter of 60 mm is provided with 20 copper wires having a diameter of 1 mm.
An exciting coil was manufactured by winding it 0 times. And inside diameter 10mm
A copper wire having a diameter of 0.1 mm was wound around the core of 50 times to make a differential type pickup coil, and the pickup coil was inserted into the exciting coil. These exciting coil and pickup coil are combined with a gain phase analyzer (“41
94A "), insert the produced non-contact magnetic card into the pickup coil, and set the frequency to 50-500KH.
The AC magnetic field was swept up to z, the resonance frequency of the sixth harmonic and its signal output were measured, and the results are shown in Table 3. Further, the 6th harmonic, the 12th harmonic, and the 20th harmonic were measured, and the results are shown in FIGS.

(Example 2) The magnetic coating was applied to a polyester film having a thickness of 100 μm to give a dry coating thickness of 30 μm.
m, a magnetic field orientation of 5000 gauss was added and dried, and slit to a width of 10 mm to prepare a non-magnetic material provided with a magnetic layer. Furthermore, the magnetic paint is applied to a thickness of 100 μm.
m coating film with a dry coating thickness of 30 μm
And a dry coating film thickness of 15 μm and 30 μm on a polyester film having a thickness of 24 μm, dried by applying a magnetic field orientation of 5000 Gauss, and slit into a width of 10 mm, respectively. A nonmagnetic support provided with a magnetic layer having a thickness of 45 μm and a thickness of 60 μm was prepared by pasting. Then, their magnetostatic properties were measured and shown in Table 1.

Then, a non-contact magnetic card of the present invention was prepared in the same manner as in Example 1 using the non-magnetic support provided with the prepared magnetic layer, and the bias magnetic field was measured. The results are shown in Table 1. Indicated. The resonance frequency and its signal output were measured, and the results are shown in Table 3.

(Example 3) Fe-Co-B-Si-based "Metgrass 2605CO" (manufactured by Allied Chemical Co.) was applied to a ductile stripe of a ferromagnetic magnetostrictive material having a thickness of 25 µm by the same etching treatment as in Example 1. After producing a ductile stripe of a ferromagnetic magnetostrictive material, the AC magnetic characteristics were measured in the same manner as in Example 1, and the results are shown in Table 2 and FIG. Further, the magnetomechanical coupling coefficient when a bias magnetic field was applied was measured by the mutual inductance method, and shown in FIG.

A non-magnetic support provided with a magnetic layer was prepared in the same manner as in Example 1 except that the thickness of the magnetic layer was 40 μm, and the magnetostatic characteristics were measured. The results are shown in Table 1. Indicated.

Then, after the non-contact magnetic card was manufactured using the manufactured ductile stripe of ferromagnetic magnetostrictive material, 6
The second harmonic, the twelfth harmonic, and the twentieth harmonic are measured, and the results are shown in FIGS. 25, 26, and 27, respectively.
It was shown to.

Example 4 The magnetic coating material was coated on a polyester film having a thickness of 50 μm so that the dry coating film thickness was 30 μm, and the dry coating film thickness was 10 μm on a polyester film having a thickness of 24 μm. Coating, apply a magnetic field orientation of 5000 gauss and dry, and stick each slit to a width of 10 mm to a thickness of 4
A nonmagnetic support provided with a magnetic layer of 0 μm was prepared.

Then, the non-contact magnetic card of the present invention was prepared in the same manner as in Example 1 by using the prepared non-magnetic support provided with the magnetic layer, and then 3 from the end face portion of the ductile stripe of the ferromagnetic magnetostrictive material. The encoder was magnetized so that the magnetization was saturated at intervals of 100/3 mm and 100/5 mm so that the fifth harmonic and the fifth harmonic were generated. Also, 100 / 3m
Sine waves having wavelengths of m and 100/5 mm intervals were overlapped and magnetized with an encoder so that the magnetization was saturated at intervals where the amplitude was 0. Further, the reproduction output was measured with a reader using a normal magnetic head, and the results are shown in FIGS. 28 and 29. The resonance frequency and its signal output were measured, and the results are shown in FIG.

(Embodiment 5) A sine wave having wavelengths of 100/6 mm and 100/20 mm intervals is superposed so that sixth-order harmonic waves and twentieth-order harmonic waves are generated from the end faces of the ductile stripes of the ferromagnetic magnetostrictive material. In addition, the resonance frequency and its signal output were measured in the same manner as in Example 3 except that the encoder was magnetized so that the magnetization was saturated at intervals where the amplitude was 0.
The result is shown in FIG.

(Embodiment 6) 100/5 mm, 100/12 m so that 5th order harmonic, 12th order harmonic and 20th order harmonic are generated from the end face of the ductile stripe of ferromagnetic magnetostrictive material.
Resonance was performed in the same manner as in Example 3 except that sine waves having a wavelength of m, 100/20 mm and a half wavelength were overlapped and magnetized by an encoder so that the magnetization was saturated at an interval where the amplitude was 0. The frequency and its signal output were measured, and the results are shown in FIG.

Example 7 Fe—Ni— having a thickness of 25 μm
Mo-B type "Metgrass 2826MB" (Allied
(Manufactured by Chemical Co., Ltd.) having a width of 2 mm and a length of 75 mm was masked with an etching resist and subjected to an etching treatment to prepare a ductile stripe of a ferromagnetic magnetostrictive material.

A milky white polyethylene terephthalate plate having a thickness of 250 μm was used as a sheet constituting a base material,
A window with a width of 3 mm and a length of 76 mm is opened in it, and another thickness of 250
Glue a milky white polyethylene terephthalate plate of μm,
The ductile stripe of the ferromagnetic magnetostrictive material was inserted so that it could be mechanically resonated, and a substrate containing the ductile stripe of the ferromagnetic magnetostrictive material was produced.

The magnetic coating material was applied onto a polyester film having a thickness of 50 μm so that the dry coating film thickness was 30 μm, and was applied onto a polyester film having a thickness of 24 μm so that the dry coating film thickness was 10 μm. 5,000
A magnetic field orientation of Gauss was added and dried, and the slits each having a width of 10 mm were stuck together to prepare a non-magnetic support provided with a magnetic layer having a thickness of 40 μm.

Next, the base material and the non-magnetic support provided with the magnetic layer are bonded together by using a heat press machine so that the ductile stripe of the ferromagnetic magnetostrictive material and the magnetic layer overlap each other, and then 5
The non-contact magnetic card of the present invention was obtained by punching into a size of 4 × 85.5 mm.

Then, in a non-contact magnetic card having a magnetic layer thickness of 40 μm, 75/3 mm, so that the third harmonic wave and the seventh harmonic wave are generated from the end face part of the ductile stripe of the ferromagnetic magnetostrictive material. The sine waves with a wavelength of 75/7 mm and a half wavelength were overlapped and magnetized with an encoder so that the magnetization was saturated at an interval where the amplitude was 0. Furthermore, 75 /
3mm, 75 / 7mm intervals are 1/2 wavelength sine wave amplitudes are combined by 1/1, 1 / 0.9, 1 / 0.8 by superimposing them by an encoder so that the amplitude becomes 0. It was magnetized.

Next, as shown in FIG. 10, a system for detecting the identification information corresponding to the magnetic recording of the non-contact magnetic card was prepared.

1 mm in diameter for a core with an inner diameter of 250 mm × 500 mm
The copper wire was wound 20 times to produce an exciting coil. And
Twenty copper wires with a diameter of 1 mm are attached to a core with an inner diameter of 250 mm x 250 mm.
Two wound coils were prepared, and a differential type search coil having a figure 8 shape was prepared. The search coil was made to face the exciting coil at a distance of 200 mm to form a detection area. The exciting coil and the search coil are connected to a gain phase analyzer (“4194A” manufactured by YHP Co., Ltd.) through a high-speed and high-band DC amplifier and an operational amplifier, and a non-contact magnetic card produced in the detection area. Insert a frequency of 50 ~ 500KHz
The AC magnetic field was swept up to and the resonance frequency and its signal output were measured. The results are shown in FIGS.

(Comparative Example 1) Except that instead of the metal magnetic powder, "CTX-970" (manufactured by Toda Kogyo Co., Ltd.) which is iron oxide magnetic powder having a coercive force of 650 oersted and a saturation magnetic flux density of 73 emu / g is used. After producing a non-magnetic support provided with a magnetic layer in the same manner as in Example 1, its magnetostatic characteristics were measured, and the results are shown in Table 1.

Then, a non-contact magnetic card was prepared in the same manner as in Example 1 using the prepared non-magnetic support provided with the magnetic layer, and the bias magnetic field was measured. The results are shown in Table 1. Also, the resonance frequency of the sixth harmonic and the signal output were measured and shown in Table 3. As can be seen from the bias magnetic field in Table 1, the signal output could not be detected when the thickness of the magnetic layer was 12.5 μm, and the signal output level was low overall.

Comparative Example 2 Instead of the magnetic layer, the thickness 33
μm ferromagnetic metal ribbon "Co-Fe-Ni semi-hard material" (Vacuumshmelz, Germany)
(e) manufactured by the same company as in Example 1 was used to prepare a non-magnetic support provided with a ferromagnetic metal ribbon, and its magnetostatic properties were measured. The results are shown in Table 1.

Then, using the non-magnetic support provided with the produced ferromagnetic metal ribbon, a non-contact magnetic card was produced in the same manner as in Example 1, and then the bias magnetic field was measured. The results are shown in Table 1. It was Further, the 6th harmonic and the 20th harmonic were measured and shown in FIGS. 14 and 18, respectively. However, as can be seen from FIG. 14, due to noise, it was not possible to detect the 6th harmonic below 100 KHz.

(Comparative Example 2) The thickness of the ferromagnetic metal ribbon was set to 6
A nonmagnetic support provided with a ferromagnetic metal ribbon was prepared in the same manner as in Comparative Example 1 except that the thickness was 6 μm, and then the magnetostatic characteristics were measured. The results are shown in Table 1.

Then, using the non-magnetic support provided with the produced ferromagnetic metal ribbon, a non-contact magnetic card was produced in the same manner as in Example 1, and then the bias magnetic field was measured. The results are shown in Table 1. It was The 6th harmonic and the 20th harmonic were measured and are shown in FIGS. 15 and 19, respectively. However, as can be seen from FIG. 15, due to noise, the 6th harmonic below 100 KHz could not be detected.

[0084]

[Table 1]

[0085]

[Table 2]

[0086]

[Table 3]

[0087]

[Table 4]

[0088]

[Table 5]

As is apparent from FIG. 11, unlike the sinusoidal wave recording method, in the case of the digital recording method, the bias magnetic field that maximizes the magnetomechanical coupling coefficient of the ferromagnetic magnetostrictive material is "Metgrass 2826MB" used in Example 1. In the range of 4.5 to 6.0 oersteds, and 5.5 in the "Metgrass 2605CO" used in Example 3.
Since it is in the range of up to 7.0 Oersted and exists in a narrow range, the digital recording method is superior as a method for magnetizing the magnetic layer.

Further, it can be seen from Tables 1 and 3 that the optimum thickness of the magnetic layer can be obtained by determining the thickness of the non-magnetic support and the preferable bias magnetic field strength.

From FIGS. 12 and 16, the difference in the generation behavior of the bias magnetic field after magnetic recording on the non-contact magnetic card of the present invention can be indirectly understood.

Further, from the magnitude and the sharpness of the resonance frequency in FIGS. 13 to 15 and FIGS. 17 to 19 corresponding to FIGS. It is clear that the magnetic layer used in the present invention is excellent as a medium for generating a magnetic field. This is due to the high anisotropy and squareness ratio, as shown in Table 1.

20 and 21 and Table 2 show AC magnetic characteristics of ductile stripes of ferromagnetic magnetostrictive materials having different hysteresis losses used in Examples 1 and 3. The frequency characteristics at the resonance points of the 6th harmonic, the 12th harmonic, and the 20th harmonic of the ferromagnetic magnetostrictive materials having different hysteresis losses are shown in FIGS.
From a comparison of these figures, it is understood that in the case of a ferromagnetic magnetostrictive material having a large hysteresis loss, the size and sharpness at the resonance frequency decrease as the harmonic order increases.

[0094]

The non-contact magnetic card of the present invention has a high output of high-order harmonics and a high sharpness, and can easily identify many kinds.

Further, the resonance frequency of the ductile stripe of the ferromagnetic magnetostrictive material can be controlled by using the digital magnetic recording method. Further, the amount of recorded information can be increased by using a plurality of ductile stripes of ferromagnetic magnetostrictive material. Since a conventional encoder can be used for magnetic recording, compatibility can be maintained.

Further, since the coercive force of the magnetic layer used in the embodiment of the present invention is about 1580 oersted, there is a problem of erasing the magnetic information of the magnetic layer, for example, a problem that the magnetic information is erased by a buckle such as a handbag. Is less than a metal ribbon made of a hard magnetic material.

Further, the magnetic layer used in the present invention is excellent in workability, unlike the metal ribbon of the hard magnetic material.
Further, regarding the length of the ductile stripe of the ferromagnetic magnetostrictive material, even if the length is shortened, the bias magnetic field is uniformly applied, so that the number of resonance frequencies can be increased by using the plurality of ductile stripes.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a basic configuration of a magnetic marker that mechanically resonates at a frequency selected in advance with respect to an incident AC magnetic field having a frequency that fluctuates in a detection region.

FIG. 2 is a schematic plan view showing an example of a non-contact magnetic card of the present invention.

FIG. 3 is a schematic cross-sectional view showing an example of the non-contact magnetic card of the present invention, taken along the line XX ′ shown in FIG.

FIG. 4 is a schematic cross-sectional view illustrating a case of increasing the thickness of a magnetic layer used in the non-contact magnetic card of the present invention.

FIG. 5 shows a state in which a magnetic layer having a length L is magnetized into n equal parts,
FIG. 6 is a schematic diagram showing an example in which a bias magnetic field from the magnetic layer is applied to a ductile stripe of a ferromagnetic magnetostrictive material having a length L.

FIG. 6 is a schematic diagram showing a magnetizer.

FIG. 7 is a schematic diagram showing an encoder.

FIG. 8 is a chart showing waveforms of a recording current and a reproducing voltage in a sine wave recording method.

FIG. 9 is a chart showing waveforms of a recording current (solid line) and a reproducing voltage (broken line) in a digital recording system.

FIG. 10 is a schematic diagram showing a system for detecting identification information corresponding to magnetic recording of the non-contact magnetic card of the present invention.

FIG. 11 is a chart showing the relationship between the magneto-mechanical coupling coefficient of a ductile stripe of a ferromagnetic magnetostrictive material and the magnitude of a bias magnetic field.

[Explanation of symbols]

 Solid line "Methograss 2826MB" used in Example 1 Broken line "Methograss 2605CO" used in Example 3

FIG. 12 is a table showing reproduction waveforms after magnetic recording of the magnetic layers of the non-contact magnetic cards obtained in Example 1 and Comparative Examples 1 and 2 at 100/6 mm intervals.

13 is a graph of 6 in the non-contact magnetic card obtained in Example 1. FIG.
It is a chart showing a detection result of a signal of the second harmonic.

14 is a graph of 6 in the non-contact magnetic card obtained in Comparative Example 2. FIG.
It is a chart showing a detection result of a signal of the second harmonic.

15 is a graph of 6 in the non-contact magnetic card obtained in Comparative Example 3. FIG.
It is a chart showing a detection result of a signal of the second harmonic.

16 is a table showing reproduction waveforms after magnetic recording at 100/20 mm intervals in the magnetic layers of the non-contact magnetic cards obtained in Example 1 and Comparative Examples 2 and 3. FIG.

FIG. 17: 2 in the non-contact magnetic card obtained in Example 1
It is a chart showing a detection result of a 0th harmonic signal.

18 is a graph of 2 in the non-contact magnetic card obtained in Comparative Example 2. FIG.
It is a chart showing a detection result of a 0th harmonic signal.

FIG. 19 shows 2 in the non-contact magnetic card obtained in Comparative Example 3.
It is a chart showing a detection result of a 0th harmonic signal.

20 is a chart showing a hysteresis curve when an alternating magnetic field having a frequency of 1 KHz and a maximum magnetic field strength of 5 oersted is applied to the ductile stripe of the ferromagnetic magnetostrictive material used in Example 1. FIG.

21 is a chart showing a hysteresis curve when an alternating magnetic field having a frequency of 1 KHz and a maximum magnetic field strength of 5 oersted is applied to the ductile stripe of the ferromagnetic magnetostrictive material used in Example 3. FIG.

FIG. 22 is a table showing the detection results of sixth harmonic signals when a fluctuating AC magnetic field is applied to the non-contact magnetic card obtained in Example 1.

FIG. 23 is a table showing the detection results of 12th harmonic signals when a fluctuating AC magnetic field is applied to the non-contact magnetic card obtained in Example 1.

FIG. 24 is a table showing the detection results of 20th harmonic signals when a fluctuating AC magnetic field is applied to the non-contact magnetic card obtained in Example 1;

FIG. 25 is a table showing detection results of sixth harmonic signals when a fluctuating AC magnetic field is applied to the non-contact magnetic card obtained in Example 3;

FIG. 26 is a table showing the detection results of 12th harmonic signals when a fluctuating AC magnetic field is applied to the non-contact magnetic card obtained in Example 3;

FIG. 27 is a table showing detection results of 20th harmonic signals when a fluctuating AC magnetic field is applied to the non-contact magnetic card obtained in Example 3;

FIG. 28 is a chart showing recording waveforms during digital magnetic recording of 100/3 mm intervals, 100/5 mm intervals and their combination in the magnetic layer of the non-contact magnetic card obtained in Example 4.

FIG. 29 is a table showing reproduction waveforms after digital magnetic recording of 100/3 mm intervals, 100/5 mm intervals, and their combination in the magnetic layer of the non-contact magnetic card obtained in Example 4.

FIG. 30 is a detection result of the third harmonic, the fifth harmonic, and the signals of the third harmonic and the fifth harmonic when a fluctuating AC magnetic field is applied to the non-contact magnetic card obtained in Example 4. FIG.

FIG. 31 is a chart (upper row) showing the detection results of the 6th harmonic and 20th harmonic signals when a fluctuating AC magnetic field is applied to the non-contact magnetic card obtained in Example 5; 6 is a chart (lower part) showing the detection results of signals of the 5th harmonic, the 12th harmonic, and the 20th harmonic when a fluctuating AC magnetic field is applied to the non-contact magnetic card obtained in 6.

32 is a 1/1 ratio of the amplitude of a sine wave when recording a signal of a third harmonic and a seventh harmonic when a fluctuating AC magnetic field is applied to the non-contact magnetic card obtained in Example 7. FIG. When recording the signals of the third harmonic and the seventh harmonic when a fluctuating AC magnetic field is applied to the non-contact magnetic card obtained in Example 7 The sine wave amplitude of 1
A graph (middle) showing the detection result when the ratio is set to /0.9, and the third harmonic and the seventh harmonic when a fluctuating AC magnetic field is applied to the non-contact magnetic card obtained in Example 7. 6 is a chart (lower part) showing the detection result when the amplitude of the sine wave at the time of recording the wave signal is set to 1 / 0.9.

[Explanation of symbols]

 1 Metallic ribbon of hard magnetic material 2 Ductile stripe of ferromagnetic magnetostrictive material 3 Square tray case 4 Magnetic layer 4'Magnetic layer 5 Protective layer 6 Sheet 6'Sheet 7 Adhesive layer B Nonmagnetic support B'Nonmagnetic support C Base material 100 Device 101 Oscillator 102 Output amplifier 103 Excitation coil 200 Device 201 Pickup coil 202 Spectrum analyzer

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location G11B 5/80 9196-5D

Claims (5)

[Claims] 1. A magnetic layer on which magnetic information is recorded is provided on one surface of a non-magnetic support, and a bias magnetic field is applied from the magnetic layer to the other surface of the non-magnetic support, and a frequency fluctuating within a detection region is set. The magnetic layer has a ductile stripe of a ferromagnetic magnetostrictive material that mechanically resonates at a preselected frequency corresponding to the incident AC magnetic field, and the magnetic layer has a saturation magnetic flux density of 100 emu / A non-contact magnetic card which is a magnetic layer formed by dispersing magnetic powder of g or more. 2. The non-magnetic support has a thickness of 10 to 250 μm.
The non-contact magnetic card according to claim 1, wherein the range is m. 3. The residual magnetic flux density of the magnetic layer is 1 to 25 Mx /
The non-contact magnetic card according to claim 1 or 2, wherein the contactless magnetic card has a range of cm. 4. The magnetic information is magnetic information recorded by a digital recording method.
Alternatively, the non-contact magnetic card described in 3. 5. The hysteresis loss of the ductile stripe of the ferromagnetic magnetostrictive material is in the range of 1 to 50 J / m ³ in an alternating magnetic field having a frequency of 1 KHz and a maximum magnetic field strength of 5 oersteds. The non-contact magnetic card according to 3 or 4.