JPH11329817A - Data carrier device and detecting method and detecting device thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a identifying function which does not erroneously operate the system, even when the device passes the magnetic system of different detecting purpose. SOLUTION: A magnetic element 2 is arranged between the sheets 3B and 3C among sheets 3A to 3D of a base material 1. The magnetic element 2 is constituted of a transmitting magnetic body which generates the identifying signal when an alternating magnetic field is applied, and a controlling magnetic body which controls whether to generate the identifying signal from the above described transmitting magnetic body or not. These bodies are arranged in close proximity in the network pattern. At the place other than the detecting device of a data carrier device, the controlling magnetic body is magnetized, and the magnetic field is biased and applied on the transmitting magnetic body. The controlling magnetic body inhibits the transmission of the signal from the transmitting magnetic body, even if the alternating magnetic field is applied in the other magnetic system.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data carrier device having a built-in magnetic element which generates a unique signal by suddenly reversing magnetization when an alternating magnetic field is applied from the outside, a method for detecting the same, and a detection device therefor.

[0002]

2. Description of the Related Art In general, a portable medium for recording data of a relatively small amount of information such as personal information is called a data carrier device. A magnetic card is widely used as such a data carrier device. Examples of the magnetic card include a magnetic stripe card in which a magnetic tape is adhered to a vinyl chloride substrate and the like, and a PET card in which a magnetic paint is applied to a polyethylene terephthalate film. Magnetic stripe cards are mainly used as ATMs and credit cards in banks, and PET cards are often used as prepaid cards such as telephone cards and tickets.

[0003] On the other hand, bar codes are also a kind of data carrier device in a broad sense, and are widely used because a mechanism for optically reading a print pattern can be extremely easily used. There is a disadvantage that data cannot be read. In recent years, various data carrier devices have been developed in place of the magnetic cards and bar codes as described above.

As an alternative to the above magnetic card and bar code, for example, an IC card with a built-in integrated circuit such as a microcomputer and a memory is used for transportation, finance, medical care, and the like.
It has begun to be used in a wide variety of fields such as services. Such IC cards include a contact type having a contact and a non-contact type having no contact. Non-contact type cards that use radio waves and those that use magnetic signals have been developed. Non-contact type IC cards can send and receive data to and from a data processing terminal device. It is also expected to be used as an element for sorting articles and for security.

When the information recorded on these data carrier devices is related to money, there is a problem that the data carrier device is forged or the data is altered and used illegally. As a method for preventing such unauthorized use, a so-called software method of encrypting data and setting a password, and a method of incorporating a security mechanism in the data carrier itself in a hardware manner are generally adopted. .

[0006] For example, as one of the latter hardware methods, there has been conventionally known a method in which a magnetic element for rapidly reversing magnetization is incorporated in a data carrier device (for example, Japanese Patent Application Laid-Open No. H10-69603). reference). In these devices, an alternating magnetic field is applied to make an inquiry to the data carrier device, and at that time, an inherently large harmonic component generated by a sudden magnetization reversal generated in a magnetic element incorporated in the data carrier device is generated. Signal of
The data carrier device is identified based on the signal.

In the above data carrier device, many types of signals can be generated by combining a plurality of magnetic elements having different magnetic field strengths for magnetization reversal, and a large number of data carrier devices can be identified accordingly. You can also. Further, the data carrier device includes:
Signals can be detected remotely without contact, and a magnetic card or IC card can be provided with a security recognition function. Furthermore, by incorporating only the magnetic element as described above without incorporating an IC or the like, it can be used alone as a simple data carrier device.

[0008]

In the data carrier device with the identification function as described above, when an alternating magnetic field of a certain magnitude or more is applied, the built-in magnetic element reverses its magnetization to generate a signal. Therefore, the magnetic element built in the data carrier device responds when an alternating magnetic field of a certain magnitude or more is applied irrespective of whether or not the inspection is being performed by the detection device of the data carrier device. However, since the detection device itself dedicated to the identification of the data carrier device has a function of discriminating a specific signal from various signals, it is not necessary to consider the problem of malfunction.

On the other hand, it is manufactured for a purpose different from the data carrier device having the identification function as described above,
In a data carrier device having a simpler structure than a detection device for identification, there is a problem that a malfunction is caused by a signal from a magnetic element whose magnetization is inverted. For example, in a magnetic anti-theft system, a soft magnetic material laminated with an adhesive film and made into a label is affixed to the product as an anti-theft marker, and an interrogation area is set up at the entrance and exit. There is a system in which a magnetic field is applied and an inspection device checks whether or not a marker generates a signal.

In the above-described magnetic type anti-theft system, an alternating magnetic field of a specific frequency is applied to the inquiry area by an exciting coil, and when the commodity with the marker enters the inquiry area illegally. , The magnetic material of the marker is magnetized and emits a signal. The secondary emitted magnetic signal is captured by the detection coil of the detection device, and an alarm is issued as shoplifting.

On the other hand, since various signals including noise are generated in the inquiry area, the detection device discriminates whether the signal is a signal due to a marker or a signal due to another cause and issues an alarm. Need to be However, in the anti-theft system as described above, the detection device for identifying the signal of the anti-theft marker often employs a simpler mechanism than the detection device of the data carrier device having the identification function. In general, it does not have a sufficient function of discriminating a signal due to a marker or a signal due to another cause. Therefore, when an IC card or the like having a data carrier device with an identification function passes through the inspection area of the anti-theft system, the built-in magnetic element causes magnetization reversal, and the detection device of the anti-theft system mistakes the signal of the anti-theft marker with the signal of the anti-theft marker. Alarm.

On the other hand, in a data carrier device provided with the above-mentioned magnetic element and provided with an identification function for the purpose of preventing forgery or alteration, the magnetic element is attached to the adhesive label in the same manner as a marker is attached to a product by an anti-theft system. In the case of processing and attaching to a data carrier device, it is easy to see that a magnetic element for identification is attached to the data carrier, and there is also a problem that the magnetic element is detached from the data carrier device. Was.

An object of the present invention is to provide a data carrier device having an identification function that does not cause a malfunction of a magnetic system having a different detection purpose, such as an anti-theft system, even when the system passes therethrough, a detection method thereof, and a detection method. It is to provide a device.

Another object of the present invention is to provide a reliability in which it is difficult to know that there is a magnetic element for generating a signal for identification from the outside, and it is difficult to remove or falsify the magnetic element. To provide a high-performance data carrier device.

[0015]

In order to achieve the above object, according to the first aspect of the present invention, there is provided a transmitting magnetic body which suddenly reverses magnetization when an alternating magnetic field is applied to emit a signal to the outside; It is characterized in that a magnetic element is provided which is arranged in close proximity to the transmitting magnetic body and is combined with a control magnetic body having a larger coercive force than the transmitting magnetic body.

The data carrier device defined in claim 1 is preferably a magnetic card or an IC card, and is particularly suitable for identifying wirelessly used articles such as a non-contact IC card. However, the present invention is not limited to this. When the magnetic element includes a plurality of types each of which generates a different signal, the magnetic element itself can be regarded as an element recording data, and is used as a simple data carrier device such as an ID tag. be able to.

The data carrier device has a built-in magnetic element that emits a unique signal when an alternating magnetic field is applied from the outside. The magnetic element is composed of a transmitting magnetic body that generates a signal by suddenly reversing the magnetization when an alternating magnetic field is applied from the outside, and a controlling magnetic body that controls the magnetization state of the transmitting magnetic body. As the transmitting magnetic body, a so-called large Barkhausen inversion material, which is disclosed as a marker material of an anti-theft system in Japanese Patent Publication No. 3-27958 and Japanese Patent Application Laid-Open No. 4-218905, for example, can also be used. .

In the data carrier device according to the present invention, even if such a material is incorporated in the data carrier,
No signal is emitted when taken into the interrogation zone of the anti-theft system, and the anti-theft system does not malfunction. As the material for the marker, an amorphous or crystalline alloy based on Fe or Co can be used, and the form thereof can be a thin wire, a ribbon, or a thin film.

Such a material has a specific orientation (positive and negative).
And the magnetic domain structure is such that the magnetization becomes extremely stable. When the applied magnetic field intensity reaches a certain critical value, the magnetization is reversed all or part of the material at once. Since the magnetization is reversed very rapidly, a very sharp magnetic pulse is emitted to the surroundings. Such a pulse signal has a very high ratio of high-frequency harmonic components, and has an outstanding feature not found in other magnetic materials.

Further, if a plurality of magnetic elements having different magnetic field strengths for reversing the magnetization are incorporated in the data carrier device,
When excited by a periodic magnetic field, magnetic pulse signals are generated at regular intervals. Therefore, the type and the type of the magnetic element can be determined by analyzing the timing and number of the magnetic pulses or the magnetic field strength. In such a case, a higher security signal can be obtained, and a data carrier device can be obtained only by the identification signal of these magnetic elements.

As the magnetic material for signal transmission other than the large Barkhausen inversion material, a material used for an article monitoring marker disclosed in Japanese Patent Publication No. 3-55873 or Japanese Patent Publication No. 3-58072 may be used. it can. These materials are made of a low magnetostrictive soft magnetic metal such as a Co-based or Ni-based amorphous alloy, an alloy composed of fine crystals of permalloy or sendust, bcc-Fe or fcc-Co, and have a coercive force. Due to its low temperature, it shows a sudden change in magnetization with a very small magnetic field.

As the shape of the magnetic body for signal transmission, for example, in the case of a thin wire, a wire having a diameter of 10 μm to 150 μm is preferable, and a wire having a diameter of 20 μm to 100 μm is more preferable. When the magnetic element is a ribbon, the thickness is 5μ.
m to 50 μm is preferred, and more preferably 15 μm to 3 μm.
Those having a thickness of 0 μm are more preferable. When the magnetic element is a thin film, the thickness is preferably from 0.1 μm to 10 μm.
If it is 5 μm to 5 μm, it can be more preferably used. The length of the magnetic body for signal transmission is preferably 10 mm or more, and is preferably smaller than the size of the data carrier device because of its incorporation into the data carrier device.

The magnetic element incorporated in the data carrier device according to the present invention is composed of the above-mentioned transmission magnetic body and a control magnetic body for controlling its magnetization. The control magnetic body is combined to apply a DC magnetic field to the transmission magnetic body. When the control magnetic body is demagnetized and no bias magnetic field is applied to the transmitting magnetic body, an alternating magnetic field can be applied to the magnetic element to cause the transmitting magnetic body to undergo a sudden magnetization reversal at the specific magnetization reversal magnetic field strength. And send a signal.

On the other hand, when the control magnetic material is magnetized and a bias magnetic field is applied to the transmitting magnetic material, the transmitting magnetic material is magnetically saturated by the bias magnetic field, and the alternating magnetic field smaller than the bias magnetic field is used. The magnetization is not reversed, and the transmitting magnetic body does not emit a signal. Therefore, in the data carrier device of the present invention, if the control magnetic element is magnetized, the anti-theft system does not malfunction even when passing through the inspection area of the anti-theft system.

The control magnetic material is made of a material having a larger coercive force than the transmitting magnetic material, and is preferably a material having as high a residual magnetic flux density as possible. The coercive force is preferably at least four times the coercive force of the transmitting magnetic body, and more preferably at least ten times the coercive force. The value is preferably 10 Oe or more, and more preferably 30 Oe or more. This is because if the coercive force is too small, it may be demagnetized by an excitation magnetic field or a natural magnetic field applied by the data carrier detection device.

On the other hand, the detection device side of the data carrier device having the identification function needs to read the signal from the magnetic element, and the control magnetic material must be demagnetized in the data carrier device. If the coercive force is too high, the degaussing operation becomes difficult. Therefore, the holding force of the control magnetic material is preferably 500 Oe or less, and more preferably 200 Oe or less.

When a magnetic element is incorporated in a magnetic card, the recording medium and the control magnetic body of the magnetic card are selected from materials whose coercive force satisfies the following relationship. That is, when the coercive force of the control magnetic body is close to the coercive force of the recording medium, there is a possibility that the recording data of the medium may be demagnetized at the same time as the control magnetic body is demagnetized. The magnetic force is suitably at least a quarter or less of the coercive force of the medium. However, in general, the coercive force of the recording medium of the magnetic card is often larger than about 1000 Oe, and the coercive force of the control magnetic material is 200.
Below Oersted there is not much of a problem.

As a material satisfying the above conditions as the control magnetic body, a semi-hard magnetic material of an alloy of Fe or Co, for example, Arnold's Arnochrome or Vacuum Schmerze's Semivac is suitable. , Ni foil and the like can also be used. The shape may be a thin strip, a small piece, a thin wire, a thin film, or the like, or a magnetic paint. These control magnetic bodies are arranged close to the transmitting magnetic body. The distance between them is suitably 5 mm or less, and it is desirable that both are in contact with each other.

In the data carrier device according to the present invention, the magnetic element is built in the data carrier device. For example, the base material of a magnetic card or an IC card is a sheet made of an organic polymer resin such as vinyl chloride or polyethylene terephthalate. If the magnetic element is enclosed in these sheets, the magnetic element Is invisible from the outside and cannot be removed, even if recognized externally. Further, by making the magnetic element sealed in the above-described base material, it is possible to prevent the magnetic element from being deteriorated with time due to moisture, gas, and the like.

The data carrier device according to the present invention can be detected by the following detection methods and detection devices described in claims 2 and 3, respectively.

In other words, the invention according to claim 2 is a transmission magnetic body that suddenly reverses magnetization when an alternating magnetic field is applied to emit a signal to the outside, and is arranged close to the transmission magnetic body. A magnetic element formed by combining a control magnetic substance having a larger coercive force than the transmission magnetic substance is built in the data carrier device, the control magnetic substance is demagnetized, and an alternating magnetic field is applied to transmit. A signal resulting from magnetization reversal of the control magnetic body is detected, a DC magnetic field is applied, and the control magnetic body is magnetized again.

According to a third aspect of the present invention, there is provided a transmitting magnetic body which rapidly reverses magnetization when an alternating magnetic field is applied to emit a signal to the outside, and is disposed close to the transmitting magnetic body. A detection device for detecting a data carrier device including a built-in magnetic element formed by combining a control magnetic material having a larger coercive force than the transmission magnetic material,
A degaussing mechanism for degaussing the control magnetic body, a magnetizing mechanism for magnetizing the control magnetic body, a scanning mechanism for applying an alternating magnetic field for signal reading to the data carrier device, A detection mechanism for detecting a signal.

[0033]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
An embodiment in which the present invention is applied to a magnetic stripe card will be described.

The base material of the magnetic stripe card is generally formed by laminating two to four sheets of an organic polymer material such as vinyl chloride and press-molding the base material. The recorded magnetic tape is stuck. FIG. 1 shows the configuration of a magnetic stripe card (data carrier device) according to the present invention. The magnetic stripe card 10 has a base material 1 composed of four sheets 3A to 3D.
The magnetic element 2 is a sheet 3B
And 3C. As shown in FIG. 2, the magnetic element 2 is composed of five transmitting magnetic bodies 4A to 4E and three controlling magnetic bodies 5A to 5C, which are arranged in a mesh-like manner. In the present embodiment, the transmitting magnetic members 4A to 4E and the control magnetic members 5A to 5C are in contact with each other.

The numbers and shapes of the transmitting magnetic members 4A to 4E and the control magnetic members 5A to 5C are not limited to those shown in FIG. Further, as shown in FIG. 2, the control magnetic bodies 5A to 5C are more efficient in applying a magnetic field bias when they are divided into a plurality of parts, but are more integrated. The arrangement and the like are easy to handle, and may be appropriately selected. Further, the number of transmitting magnetic bodies is determined by how many kinds of signals are prepared as identification signals, and how sophisticated a security signal is required. Therefore, if only the presence or absence of a signal needs to be detected, only one signal may be used.

The transmitting magnetic members 4A to 4E and the control magnetic members 5A to 5C may be directly inserted between the sheets 3B and 3C. And 3C. In this way, the transmitting magnetic bodies 4A to 4E and the control magnetic bodies 5A to 5C
In addition to the efficiency in supplying the magnetic material, there is an effect of preventing a stress generated at the time of molding such as pressing from adversely affecting the transmitting magnetic members 4A to 4E and the controlling magnetic members 5A to 5C.

The material to be laminated may be a molded product in which the magnetic element 2 is filled with resin, but a material laminated between two films 6 is suitable, and the thickness of the film 6 is more preferably 5 to 100 μm. I have. With a film less than 5 μm, the effect of buffering the stress is not sufficient.
If the thickness exceeds 00 μm, lamination and subsequent handling become difficult.

As described above, the magnetic element 2 includes the sheet 3
Inserted between B and 3C, the whole is pressed and integrated, and the magnetic stripe 7 is attached. Therefore, the magnetic element 2 is mounted in the substrate 1 of the magnetic stripe card 10 in a sealed state. In such a configuration, the existence of the magnetic element 2 cannot be confirmed from the outside, and it is practically impossible to remove the magnetic element 2 from the magnetic stripe card 10, so that it is difficult to change the mouse. High security can be ensured.

In the magnetic stripe card 10, the control magnetic members 5A to 5C are used so that the transmitting magnetic members 4A to 4E do not emit signals even when an alternating magnetic field is applied in another magnetic system. It is. Therefore,
In places other than the magnetic stripe card 10 detection device,
The control magnetic bodies 5A to 5C are magnetized, so that a bias magnetic field is applied to the transmission magnetic bodies 4A to 4E.

The magnetic stripe card 10 having the configuration described above is detected by the detection device 20 shown in FIG. 3 as follows. That is, as shown in FIG. 3A, when the magnetic stripe card 10 is inserted into the opening of the slot 21 of the detection device 20, the magnetic stripe card 10 becomes as shown in FIGS. 3B to 3D. The automatic transport mechanism of the detection device 20 transports the inside of the slot 21 toward the back as shown by an arrow A1.

In the first stage of the transport, a process for demagnetizing the control magnetic bodies 5A to 5C is executed. In this process, in FIG. 3B, an alternating magnetic field larger than the coercive force is applied to each of the control magnetic bodies 5A to 5C so that the alternating magnetic field is temporally attenuated. That is, the degaussing coil 9 is provided near the opening of the slot 21, and an alternating magnetic field having a constant strength is applied to the degaussing coil 9. Since the magnetic stripe card 10 continuously moves in the direction indicated by the arrow A1 in the slot 21, the magnetic stripe card 10 gradually moves away from the degaussing coil 9 and the magnetic field applied to the control magnetic bodies 5A to 5C attenuates accordingly.
The control magnetic bodies 5A to 5C included in the magnetic element 2 are demagnetized. In order to apply an alternating magnetic field that attenuates over time to each of the control magnetic bodies 5A to 5C as described above, the magnetic field may be attenuated by sequentially controlling the current flowing through the degaussing coil 9. Good.

Next, as shown in FIG. 3B, the magnetic stripe card 10 includes an excitation coil 10A for applying an alternating magnetic field to excite the magnetic element 2 and a detection coil 10B for detecting a signal from the magnetic element 2. 3 (C) of FIG. At this position, the control magnetic bodies 5A to 5C have already been demagnetized by the demagnetizing coil 9, and no magnetic field has been applied to the transmitting magnetic bodies 4A to 4E. 10 transmission magnetic bodies 4
Each of A to 4E reverses magnetization and emits a unique signal. These signals are captured as induced voltage pulses by the detection coil 10B. Each of these induced voltage pulses is analyzed for the frequency component of the pulse, the generated magnetic field strength, and the like, and the magnetic element 2 is recognized.

Next, the magnetic stripe card 10 moves through the slot 21 of the detecting device 20 and further moves to the state shown in FIG.
Is moved to the position shown by the arrow, the magnetic head 11 causes the magnetic stripe 7 of the magnetic stripe card 10 (see FIG. 1).
Is read and processed. This step is exactly the same as the operation of the conventional magnetic card reader. The magnetic stripe card 10 on which the processing of the data of the magnetic stripe 7 has been completed is conveyed through the slot 21 in the direction indicated by the arrow A2 in FIG. .

In the process of unloading the magnetic stripe card 10, the control magnetic body 5 of the magnetic element 2 is controlled by the permanent magnets 8 A and 8 B for magnetization arranged near the opening of the slot 21.
A to 5C (see FIG. 2) are magnetized again. An electromagnet in which a direct current is applied to the coil can be used for the magnetization. As a result, the transmitting magnetic bodies 4A to 4E of the magnetic stripe card 10 that have passed through the detecting device 20 are in a state where the magnetic field is again biased, and the original signal is not transmitted. There is no malfunction of the system.

[0045]

EXAMPLES Examples and comparative examples of the present invention will be described below.

Example 1 Assuming a magnetic stripe card as a data carrier device, a sample having a structure shown in FIGS. 4 and 5 was prepared. As the transmitting magnetic bodies 4A, 4B, and 4C constituting the magnetic element 2, an amorphous metal thin wire of Co ₃₉ Fe ₃₉ Si ₇ B ₁₅ (atomic%) having a wire diameter of 30 μm and a length of 15 mm was used. These were subjected to large Barkhausen inversion at different magnetic field strengths by heat treatment at different temperatures.

The large Barkhausen reversal magnetic field strength of these fine wires was measured as follows. A solenoid-type detection coil having a length of 150 mm and 567 turns was coaxially inserted into the center of a solenoid-type exciting coil having a length of 300 mm and 560 turns. The fine wire described above was inserted into the center of the detection coil. An alternating current was supplied to the exciting coil from an HP-3324A synthesized function sweep generator manufactured by Hewlett-Packard Company, and a triangular wave magnetic field of 60 Hz and 4 Oersted (Oe) was generated. An HP-54110 digitizing oscilloscope manufactured by Hewlett-Packard Company was connected to the detection coil, and the pulse voltage induced in the detection coil due to the magnetization reversal of the sample was measured. From the results, the measured values of the large Barkhausen reversal magnetic field strength of the three amorphous metal wires were 0.6, 1.4, and 2.5 Oersteds (O, respectively).
e).

As shown in FIG. 5, the three amorphous metal thin wires were made of polyethylene terephthalate (PET) having a length of 25 mm, a width of 25 mm, a thickness of 25 μm, and a thickness of the adhesive of 20 μm, coated with an adhesive on one side. 1 m on the adhesive surface of film 6
They were arranged at m intervals. Further, between these fine wires, the control magnetic bodies 5A, 5B, 5C, and 5D have a meridian of 100 μmφ,
Four 15 mm-length vacuum bags manufactured by Vacuum Schmelze were arranged. In addition, these control magnetic bodies 5A, 5A,
The coercive force of B, 5C and 5D is about 100 Oersted (O
e). From above, the same single-sided adhesive film as described above was attached and a film-laminated magnetic element 2 was obtained. This magnetic element 2 has a thickness of 300 μm as shown in FIG.
m, sandwiched between sheets 3B and 3C made of vinyl chloride, and a 100 μm thick over film 3 made of vinyl chloride.
A, 3D stacked vertically, temperature 130 ° C, pressure 10kg
/ Cm ² and hot-pressed for 10 minutes to integrally mold to obtain a card-shaped sample.

In the sample obtained as described above, the magnetic element 2 is completely encapsulated in the substrate 1 composed of the vinyl chloride sheets 3B and 3C and the over films 3A and 3D. Was opaque, so that the magnetic element 2 was not visually recognized from the external appearance.

The response characteristics of the sample were measured using the same measurement system as described above.
B, 5C, 5D are demagnetized and the transmitting magnetic bodies 4A, 4B,
When no magnetic field was applied to 4C, signals were transmitted from the transmitting magnetic bodies 4A, 4B, and 4C by excitation, and three voltage pulses were measured in the detection coil. On the other hand, when the control magnetic bodies 5A, 5B, 5C, and 5D are magnetized, a DC magnetic field is applied to the transmission magnetic bodies 4A, 4B, and 4C from the control magnetic bodies 5A, 5B, 5C, and 5D. It was magnetically saturated, the magnetization was not reversed by the alternating magnetic field applied by the measurement system, and no signal was emitted. When the responsiveness of the anti-theft system manufactured by Sensormatic was measured, when the control magnetic bodies 5A, 5B, 5C, and 5D were demagnetized, the control magnetic bodies 5A, 5B, 5C, and 5D were not included. As in the case of the sample, an alarm was issued at a distance of 5 cm from the detection coil and malfunction occurred, but the control magnetic body 5A,
When 5B, 5C, and 5D were magnetized, no alarm sounded.

As described above, the transmitting magnetic members 4A, 4B,
The magnetic element 2 in which the 4C and the control magnetic bodies 5A, 5B, 5C, and 5D are combined is enclosed in the base material 1, and the control magnetic bodies 5A, 5B, 5C, and 5D are demagnetized or magnetized. By adjusting the magnetization state, the transmitting magnetic body 4A,
4B and 4C were able to be read, and malfunctions in other magnetic systems were prevented.

[0052]

As described above, according to the present invention, when an alternating magnetic field is applied from the outside, a sudden magnetic reversal is exhibited and a magnetic pulse is radiated to the surroundings. By enclosing a magnetic element in combination with a control magnetic material serving as a switch for applying a voltage in a base material, a data carrier device having an identification function that is unlikely to malfunction in other magnetic systems can be obtained. .

Further, according to the present invention, the identification signal of the data carrier device can be recognized not only remotely and accurately, but also because the magnetic element is sealed in the base material, it is difficult to recognize the signal, and it is difficult to change the mouse. There is, therefore, a highly reliable data carrier device with high security and little change over time.

Further, according to the present invention, the control magnetic body is demagnetized only in the detecting device, the unique signal of the transmitting magnetic body is read, and the control magnetic body is magnetized in other than the detecting device. Since it is magnetically saturated, it can be used safely without interfering with other magnetic systems.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a configuration of one embodiment of a data carrier device according to the present invention.

FIG. 2 is a plan view showing a structure of a magnetic element incorporated in the data carrier device of FIG.

3A to 3E are explanatory diagrams of a detection process of a detection device used for detection of the data carrier device in FIG. 1, wherein each of FIGS.

FIG. 4 is an exploded perspective view of a sample of the data carrier device manufactured in the first embodiment.

5 is a plan view of a magnetic element built in the sample of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base material 2 Magnetic element 3A, 3B, 3C, 3D sheet 4A, 4B, 4C, 4D, 4E Transmission magnetic body 5A, 5B, 5C, 5D Control magnetic body 6 Film 7 Magnetic stripe 8A, 8B For magnetization Permanent magnet 9 Demagnetizing coil 10 Magnetic stripe card 10A Exciting coil 10B Detection coil 11 Magnetic head 20 Detector 21 Slot

Claims (3)

[Claims] 1. A transmitting magnetic body that rapidly reverses magnetization when an alternating magnetic field is applied to emit a signal to the outside, and is disposed close to the transmitting magnetic body and larger than the transmitting magnetic body. A data carrier device having a built-in magnetic element in which a control magnetic body having a coercive force is combined. 2. A transmitting magnetic body which rapidly reverses magnetization when an alternating magnetic field is applied to emit a signal to the outside, and is disposed close to the transmitting magnetic body and larger than the transmitting magnetic body. A magnetic element formed by combining a control magnetic substance having a coercive force is built in the data carrier device,
A data carrier for demagnetizing the control magnetic body, detecting a signal due to magnetization reversal of the transmitting magnetic body by applying an alternating magnetic field, and applying a DC magnetic field to remagnetize the control magnetic body; Device detection method. 3. A transmitting magnetic body that rapidly reverses magnetization when an alternating magnetic field is applied to emit a signal to the outside, and is disposed close to the transmitting magnetic body and larger than the transmitting magnetic body. A detection device for detecting a data carrier device having a built-in magnetic element formed by combining a control magnetic body having a coercive force, comprising: a degaussing mechanism for degaussing the control magnetic body; and the control magnetic body. And a scanning mechanism for applying an alternating magnetic field for signal reading to the data carrier device, and a detecting mechanism for detecting a signal emitted from the transmitting magnetic body. Data carrier device detection device.