WO2015097913A1 - Magnetic reader device provided with magnetic interference loop antenna - Google Patents

Abstract

[Problem] To interfere with magnetic reading by an illicit magnetic reader device, without obstructing magnetic reading in a magnetic reader device proper. [Solution] This magnetic reader device is provided with a magnetic coil which is attached so as to surround a card insertion port into which a card is to be inserted and which emits magnetic interference to interfere with reading of magnetic information from outside the card. The normal direction of the aperture plane of the magnetic coil is an oblique direction with respect to the conveyance plane of the card.

Description

Magnetic reader with loop antenna for generating disturbing magnetic field

The present invention relates to a magnetic reader which has a magnetic data illegal read preventing function of a magnetic information recording medium and reads magnetic data of the magnetic information recording medium.

Cash transaction processing devices such as cash dispensers (hereinafter referred to as CDs (Cash Dispensers)) and automated teller machines (hereinafter referred to as ATMs (Automated Teller Machines)), and further, magnetic information such as cards and passbooks are recorded In a transaction processing terminal that performs transaction processing using the above medium, a crime called skimming has occurred. In a typical skimming method, an illegal magnetic reader provided with a magnetic head is placed so as to cover the insertion opening of the magnetic information recording medium of the original magnetic reader, and the magnetic information of the magnetic stripe is illegally acquired. It is a thing. As a countermeasure against this, a technology is disclosed that uses a magnetic field to prevent the unauthorized magnetic reader from functioning.

For example, Patent Document 1 discloses a magnetic card transaction apparatus that generates a magnetic field in the area of the outer portion of a card slot for inserting and ejecting a magnetic card, and interferes with a fraudulent magnetic reader. In the magnetic card transaction apparatus, even if the magnetic head is illegally attached to the outside of the card slot, the magnetic card inserted or ejected using the illegal magnetic head is read by the disturbing magnetic field by the magnetic field generation means. Can be blocked.

Further, Patent Document 2 discloses a magnetic reading device in which a loop antenna is installed around the insertion opening of the magnetic information recording medium to prevent reading of magnetic information in front of the insertion opening. In the magnetic reader, a loop antenna attached so as to surround the magnetic information recording medium, an oscillator for generating a magnetic field from the loop antenna, and medium detection for detecting the magnetic information recording medium inserted in the insertion port And a sensor. When the medium detection sensor detects the magnetic information recording medium, the oscillator generates a magnetic field from the loop antenna, thereby interfering with magnetic data reading of the magnetic information recording medium in front of the insertion slot.

JP 2001-67524 A JP 2005-266999 A Japanese Patent Application No. 2011-551879

In the above-mentioned patent document 1, since the magnetic field generation unit generates the magnetic field in the area including the passage where the magnetic stripe of the magnetic card passes in the outer part of the card slot, skimming can be prevented. The disturbing magnetic field is also irradiated to the magnetic reading unit of the magnetic reading device main body. In order to prevent this, a method is also described in which the magnetic field is generated at the time of insertion and ejection of the card, but this method can not prevent reading while the magnetic reader is performing magnetic reading.

In the above-mentioned patent document 2, although the loop antenna attached so as to surround the periphery of the card insertion slot is used as the magnetic field generation unit, even in this case, the disturbing magnetic field for the magnetic reading unit possessed by the magnetic reading device main body And interfere with its own magnetic reading.

Further, in Patent Document 3, since the magnetic field generation unit is installed in a direction different from the magnetic reading unit of the magnetic reading device main body, it is considered that the magnetic reading of itself is not disturbed. However, extra space is required to change the installation direction of the magnetic field generator.

The present invention has been made in consideration of the above points, and an object of the present invention is to propose a magnetic reading device that interferes with magnetic reading by an illegal magnetic reading device without inhibiting magnetic reading in the magnetic reading device main body.

In order to solve such problems, in the present invention, a coil for generating a magnetic field is mounted so as to surround a card insertion slot into which a card is inserted, and generates an interfering magnetic field to prevent reading of magnetic information from the outside of the card. And the normal direction of the opening surface of the magnetic field generating coil is oblique to the transport surface of the card. According to this configuration, it is possible to weaken the disturbing magnetic field generated in the direction of the magnetic reading unit of the magnetic reading device itself, and to efficiently generate the magnetic field in the direction in which the fraudulent magnetic reading device is installed.

According to the present invention, when a illegitimate magnetic reading device is installed in the magnetic reading device, the magnetic reading by the illegitimate magnetic reading device is effectively hindered without interfering with the magnetic reading function of the magnetic reading device itself. it can.

It is a block diagram which shows the structure of the principal part of the magnetic reader based on this embodiment of this invention. It is the schematic which shows the internal structure of the magnetic reader concerning the embodiment. It is a figure which shows an example of the positional relationship of the loop antenna and magnetic head concerning the embodiment. It is a conceptual diagram explaining installation of the loop antenna of a prior art and this embodiment. It is a conceptual diagram explaining the installation space of the loop antenna concerning this embodiment. It is the figure seen from the magnetic reader top concerning the embodiment. It is a figure which shows the example at the time of arrange | positioning two loop antennas concerning the embodiment. It is a conceptual diagram explaining the disturbance magnetic field of two loop antennas concerning the embodiment. It is a figure which shows the case where two loop antennas concerning the embodiment are arrange | positioned diagonally in the left-right direction. It is a figure which shows the example at the time of adding an L-shaped core to two loop antennas concerning the embodiment. It is a figure which shows the example at the time of adding an L-shaped core diagonally with respect to a card | curd conveyance surface to two loop antennas concerning the embodiment. It is the schematic which shows the internal structure of the magnetic reader which arrange | positioned the diagonally formed loop antenna concerning the embodiment. It is a figure which shows the case where the loop antenna formed diagonally concerning the embodiment is arrange | positioned diagonally in the left-right direction. It is a figure which shows the example at the time of arrange | positioning two loop antennas formed diagonally concerning the embodiment. It is a figure which shows the example at the time of arrange | positioning two diagonally formed loop antennas concerning the embodiment to the left-right direction aslant. It is a figure which shows the example at the time of adding an L-shaped core to two loop antennas formed diagonally concerning the embodiment. It is a figure which shows the example at the time of adding an L-shaped core to the two diagonally formed loop antennas concerning the embodiment at the diagonal direction with respect to a card conveyance surface. It is a figure which shows the case where the diagonally formed loop antenna concerning this embodiment is arrange | positioned diagonally in the up-down left-right direction.

An embodiment of the present invention will now be described in detail with reference to the drawings.

(1) First Embodiment (1-1) Configuration of Magnetic Reader First, the configuration of the magnetic reader 1 according to the present embodiment will be described. The magnetic reader 1 performs transaction processing using a cash transaction processing apparatus such as an automatic teller machine (CD) or an automatic teller machine (ATM) or a medium on which magnetic information such as a card or a passbook is recorded. It is a device provided in a terminal etc. and reading magnetic data on a magnetic card.

FIG. 1 is a block diagram showing the configuration of the main part of the magnetic reader 1. As shown in FIG. 1, the magnetic reader 1 comprises a control unit (CPU) 32 for controlling the operation of the main unit, and a magnetic information reading unit 33 for reading magnetic data recorded on a magnetic card inserted into the main unit. A card transport path 10 for transporting a card inserted in the main body, a card position sensor 34 for detecting the position of the card in the card transport path 10, a memory 35 for storing magnetic information read by the magnetic information reading unit 33 Host antenna 36, which is a connection to the device, a card slot unit 37 installed on the front of the main unit, and a loop antenna 2 installed in the card slot unit 37 to generate a magnetic field (one or more conductors A looped antenna, a magnetic field control unit 38 for controlling the operation of the loop antenna 2, and a card transport control unit 3 for controlling card transport It is configured to include the, the.

FIG. 2 is a schematic view showing the internal structure of the magnetic reader 1. In FIG. 2, reference numeral 3 denotes a magnetic card (hereinafter referred to as a card 3). A magnetic stripe 13 is formed on one side or both sides of the card 3 and magnetic data is recorded on the magnetic stripe. An insertion port 4 for inserting a card 3 is formed on the front surface of the magnetic reader 1 main body. In the vicinity of the insertion slot 4, an insertion detection sensor 41 for detecting the card 3 inserted into the insertion slot 4 is provided. The insertion detection sensor 41 is a pressure sensor, and is disposed at a position where it is pressed by the card 3 inserted from the insertion port 4.

In addition, a pair of transport rollers 5 to 8 which sandwich and transport the card 3 are arranged in the transport direction of the card 3. The magnetic reader 1 forms a conveyance path of the card 3 by the conveyance rollers 5 to 8 as a card conveyance path 10. One of the pair of conveyance rollers 5 to 8 is a drive roller to which the rotational force of the motor is transmitted, and the other is a driven roller that rotates following the drive roller. There is one motor (not shown) that drives the transport rollers 5-8.

The card conveyance control unit 39 takes in the card 3 and discharges (returns) the card 3 by controlling the rotation (including the rotation direction and the rotation speed) and the stop of the motor. The magnetic information reading unit 33 has a magnetic head 9 for reading the magnetic information recorded on the magnetic stripe 13 of the card 3 being conveyed through the card conveyance path 10 formed by the conveyance rollers 5 to 8. The magnetic head 9 is installed in contact with the card transport path 10, and reads the magnetic data recorded on the card 3 when the card 3 passes through the card transport path 10.

Further, sensors 51 to 54 for detecting the presence or absence of the card 3 are arranged along the transport path of the card 3. The arrangement interval of the sensors 51 to 54 is shorter than the length of the card 3 in the transport direction. The sensors 51 to 54 are light sensors composed of a light emitting unit and a light receiving unit (all not shown), and the light emitting unit and the light receiving unit are disposed to face each other across the conveyance path.

The sensor 51 detects that the card 3 is nipped by the transport roller 5 closest to the insertion slot 4. The sensors 52, 53, 54 detect the position of the card 3 being transported through the card transport path 10. From the detection results of the insertion detection sensor 41 and the sensors 51 to 54, it is detected whether the card 3 is inserted in the main body, and the position of the card 3 in the transport path is detected.

The fraudulent magnetic reader (not shown) comprises a magnetic head 12 for reading the magnetic information of the card 3. Although the place where the criminal installs the illegal magnetic reader is not fixed, the purpose is to read the magnetic information of the card 3 inserted or ejected into the magnetic reader 1. And, of the positions in contact with the extension line of the card conveyance path 10, it is installed on the side where the magnetic stripe 13 of the card 3 exists (the same side as the magnetic head 9).

A loop antenna 2 is provided in the insertion slot 4 of the magnetic reader 1 so as to surround the periphery thereof. The loop antenna 2 is disposed obliquely to the card transport path 10 in the vertical direction. For example, as shown in FIG. 3, the magnetic head 9 is disposed so as not to be within the range of the normal direction from the aperture plane of the loop antenna 2. When a drive signal is applied to both ends of the loop antenna 2, the loop antenna 2 generates an interference magnetic field 11 in the vicinity of the insertion slot 4.

The disturbing magnetic field 11 disturbs the stealing of the magnetic information of the magnetic card 3 by the magnetic head 12 of the unauthorized magnetic information reader attached to the front of the insertion slot 4. As described above, the magnetic head 12 of the illegal magnetic information reader is always installed on the front surface of the insertion slot 4 and on the side where the magnetic stripe 13 of the card 3 exists. The disturbing magnetic field 11 is generated from the aperture plane of the loop antenna 2 in the normal direction. Therefore, by arranging the loop antenna 2 as shown in FIG. 3 and changing the generation direction of the disturbing magnetic field 11, it is possible to disturb the stealing of the magnetic information more efficiently.

In addition, the normal direction of the opening surface of the loop antenna 2 is obliquely disposed in the vertical direction so as to be deviated from the card conveyance path 10. For this reason, the magnetic head 9 disposed so as to be in contact with the card conveyance path 10 in the magnetic reader 1 can read the magnetic information as usual without being affected by the disturbing magnetic field 11.

In FIG. 3, the magnetic head 9 is completely removed from the normal direction of the aperture plane of the loop antenna 2, but the disturbance magnetic field 11 becomes larger as it approaches the center of the aperture plane of the loop antenna 2 in the normal direction. Therefore, even if the angle of the loop antenna 2 is slightly inclined, the effect of the disturbing magnetic field 11 can be reduced.

As shown in FIG. 3B, the loop antenna can be arranged by disposing a core member 61 for suppressing the influence of the disturbing magnetic field 11 inside the magnetic reading device 1 or by taking a sufficient distance between the loop antenna 2 and the magnetic head 9. It is also possible to reduce the angle at which 2 is inclined. As a material of the core member 61, it is preferable to use a material having a large magnetic permeability such as ferrite.

(1-2) Loop Antenna and Disturbing Magnetic Field Next, with reference to FIG. 4, the installation of the loop antenna of the prior art and this embodiment will be described.

FIG. 4A to FIG. 4C are diagrams for explaining installation of a loop antenna in the prior art. FIG. 4A shows a case where the loop antenna 2 is installed without surrounding the card insertion slot 4. FIG. 4B shows a case where the loop antenna 2 of FIG. 4A is deviated from the card conveyance path 10 and diagonally arranged in the vertical direction toward the expected installation place of the magnetic head 12. In FIG. 4B, since the installation space of the loop antenna 2 becomes large, it is necessary to change the shape of the card slot unit 37 largely. FIG. 4C shows the case where the loop antenna 2 is installed so as to surround the card insertion slot 4.

FIG. 4D is a view for explaining the installation of the loop antenna according to the present embodiment. FIG. 4C shows the case where the loop antenna 2 shown in FIG. 4C is deviated from the card conveyance path 10 and diagonally arranged in the vertical direction toward the expected installation place of the magnetic head 12. In FIG. 4D, the loop antenna 2 is installed so as to surround the card insertion slot 4. For this reason, even when the loop antenna is arranged obliquely in the vertical direction, it is necessary to almost change the size of the loop antenna 2 itself and the required installation space as compared with the case of arranging as shown in FIG. It is understood that there is no

Next, the installation space of the loop antenna 2 will be described with reference to FIG. 5 (a). FIG. 5A is a prior art and is a view showing a case where the loop antenna 2 is installed in the same direction as the card transport path 10. FIG. 5B is a view showing a case where the loop antenna 2 of the present embodiment is disposed to be deviated from the direction of the card conveyance path 10. FIG. 5C is a view showing a case where the conductor of the loop antenna 2 is shifted and wound, and is a view showing a second embodiment to be described later. In FIG. 5C, the shape itself of the loop antenna 2 is formed obliquely with respect to the direction of the card conveyance path 10.

As described above, the installation space required in FIGS. 5 (a) and 5 (b) is almost the same, but FIG. 5 (b) requires a little more space. The need for a large installation space can be eliminated by slightly reducing the size of the loop antenna 2. However, with a small loop antenna, it becomes difficult to generate the disturbing magnetic field 11 far. Therefore, as shown in FIG. 5 (c), by forming the shape of the loop antenna 2 diagonally, the disturbance magnetic field can be further saved by a smaller space than that of FIG. 5 (b) without changing the size of the loop antenna 2. It becomes possible to change the generation direction of 11.

In addition, the loop antenna 2 may be disposed obliquely to the left and right direction with respect to the insertion direction of the card 3. FIG. 6 is a top view of the magnetic reader 1. As shown in FIG. 6, it can be seen that the loop antenna 2 is disposed obliquely in the left-right direction with respect to the insertion direction of the card 3 into the insertion port of the magnetic reader 1.

The position where the magnetic stripe 13 is formed on the card 3 is determined by the standard. Therefore, when the magnetic information of the card 3 is illegally read by the illegal magnetic information reader, the magnetic head 12 of the illegal magnetic information reader needs to be installed on the passage surface of the magnetic stripe 13 of the card 3. For this reason, the fraudulent magnetic information reading device is installed close to one side in the left and right direction from the center of the insertion slot 4. Therefore, when the loop antenna 2 is installed in an inclined manner in the direction of the magnetic head 12, the magnetic head 12 is largely affected by the disturbing magnetic field 11, and reading of the magnetic information of the card 3 becomes difficult. On the other hand, the magnetic head 9 possessed by the magnetic reader 1 itself deviates from the direction in which the disturbing magnetic field 11 is generated, so that the magnetic information can be read without being affected by the disturbing magnetic field 11.

Furthermore, as shown in FIG. 7, two loop antennas 2 a and 2 b may be installed in the magnetic reader 1. In FIG. 7, the loop antenna 2b is disposed inside the loop antenna 2a, and generates interference magnetic fields 11a and 11b in different directions.

Some cards 3 have magnetic stripes 13 on both sides. In this case, two magnetic heads 9a and 9b are installed in the magnetic reader 1 to read magnetic data, but a fraudulent magnetic reader may also install two magnetic heads 12a and 12b to steal the magnetic data. There is. Even in this case, by disposing the two loop antennas 2a and 2b obliquely with respect to the card conveyance path 10, respectively, it becomes possible to efficiently disturb the reading of the illegitimate magnetic information by the magnetic heads 12a and 12b. .

Further, as shown in FIG. 7, when two magnetic heads 9a and 9b are installed in the magnetic reader 1, the intensity, frequency or generation timing of the disturbing magnetic fields 11a and 11b generated from the two loop antennas 2a and 2b, respectively. It may be different. FIG. 8 shows the case where the strengths, frequencies or generation timings of the disturbance magnetic fields 11a and 11b generated from the loop antennas 2a and 2b are different.

For example, FIG. 8A shows the case where the strengths of the disturbing magnetic fields 11a and 11b generated from the loop antennas 2a and 2b are different. FIG. 8B shows the case where the frequencies of the disturbing magnetic fields 11a and 11b generated from the loop antennas 2a and 2b are different. Moreover, FIG.8 (c) shows the case where the generation | occurrence | production timings of the disturbance magnetic fields 11a and 11b generated from each of the loop antenna 2a and 2b differ.

By making the intensity, frequency, and generation timing of the disturbing magnetic fields 11a and 11b generated from the loop antennas 2a and 2b different from each other, disturbing magnetic fields from a plurality of directions with respect to the magnetic heads 12a and 12b possessed by the fraudulent magnetic reader Superimpose. Because of this, the fraudulent magnetic reader can not take measures to remove the disturbing magnetic field 11 such as filtering, and the magnetic information is more than when the magnetic heads 12a and 12b of the fraudulent magnetic reader are in a single magnetic field. Theft is difficult. Further, since the magnetic heads 9a and 9b of the magnetic reader 1 itself deviate from the direction of generation of the disturbing magnetic fields 11a and 11b, the magnetic information can be read without being affected by the disturbing magnetic field.

Furthermore, as shown in FIG. 9, two loop antennas 2 a and 2 b may be arranged diagonally in the left-right direction in the magnetic reader 1. Similar to FIG. 7, the loop antenna 2b is disposed inside the loop antenna 2a, and generates interference magnetic fields 11a and 11b in different directions. As described above, the strength, frequency or generation timing of the disturbing magnetic fields 11a and 11b generated from the two loop antennas 2a and 2b may be different.

Also in this case, since magnetic fields from a plurality of directions are superimposed on the magnetic head 12 of the fraudulent magnetic reader, stealing of magnetic information becomes more difficult than when in a single magnetic field. Also in this case, the magnetic heads 9a and 9b possessed by the magnetic reader 1 itself deviate from the direction of generation of the disturbing magnetic fields 11a and 11b, so that magnetic information can be read without being affected by the disturbing magnetic field.

Furthermore, as shown in FIG. 10, an L-shaped core 14 may be installed on the loop antenna 2. The material of the core 14 is a material having a large permeability such as ferrite. When the core 14 is installed, the disturbing magnetic field 11 radiated from the loop antenna 2 toward the inside of the magnetic reader 1 is absorbed, and the disturbing magnetic field 11 is radiated to the front side of the insertion slot 4. Therefore, by providing the core 14, the disturbance magnetic field 11 radiated from the loop antenna 2 to the front surface of the insertion slot 4 can be made larger and the influence on the inside of the magnetic reader 1 can be suppressed.

Although two cores 14 are installed in FIG. 10, only one of them may be installed. When one core 14 is installed, the effect is reduced as compared with the case where two cores 14 are installed, but the same effect as when two cores 14 are installed can be obtained.

Further, as shown in FIG. 11, the L-shaped core 14 may be installed obliquely to the card transfer surface. With such an arrangement, it is possible to more efficiently radiate the disturbing magnetic field 11 to the magnetic head 12 of the fraudulent magnetic reader. In particular, by arranging the core 14 along the direction of the disturbing magnetic field 11 generated by the loop antenna 2, the magnetic field to the magnetic head 12 side of the illegal magnetic reading device is intensified and the influence on the inside of the magnetic reading device 1 is It can be suppressed.

(2) Second Embodiment (2-1) Configuration of Magnetic Reading Device Next, as shown in FIG. 5C, generation from the loop antenna 2 in the case where the conducting wire of the loop antenna 2 is shifted and wound The magnetic field to be used will be described. The configuration of the magnetic reader 1 according to the present embodiment is substantially the same as that of the first embodiment, and therefore, the configuration different from the first embodiment will be described in detail.

(2-2) Loop Antenna and Disturbing Magnetic Field FIG. 12 shows the case where the shape of the loop antenna 2 is formed obliquely in the vertical direction with respect to the direction of the card transport path 10 by shifting and winding the conducting wire of the loop antenna 2 FIG. As shown in FIG. 12, in the shape of the loop antenna 2, as in FIG.

By forming the loop antenna 2 itself obliquely as described above, the installation space is not changed at all as compared with FIG. 5A. Therefore, without changing the size of the card insertion slot unit 37, the normal direction of the opening surface of the loop antenna 2 can be directed obliquely to the direction of the card conveyance path 10.

Furthermore, as shown in FIG. 13, the loop antenna 2 of FIG. 5 (c) may be disposed obliquely in the left-right direction. As described above, the position at which the magnetic stripe 13 is formed on the card 3 is determined by the standard. Therefore, the magnetic head 12 of the fraudulent magnetic information reader needs to be installed on the passage surface of the magnetic stripe 13 of the card 3.

For this reason, it is brought close to one side in the left-right direction from the center of the insertion slot 4 and installed. Therefore, when the loop antenna 2 is installed in an inclined manner in the direction of the magnetic head 12, the magnetic head 12 is largely affected by the disturbing magnetic field 11, and reading of the magnetic information of the card 3 becomes difficult. On the other hand, the magnetic head 9 possessed by the magnetic reader 1 itself deviates from the direction in which the disturbing magnetic field 11 is generated, so that the magnetic information can be read without being affected by the disturbing magnetic field 11.

Furthermore, as shown in FIG. 14, two loop antennas 2a and 2b shown in FIG. 5C may be installed. In FIG. 14, the loop antenna 2b is disposed inside the loop antenna 2a, and generates interference magnetic fields 11a and 11b in different directions.

Some cards 3 have magnetic stripes 13 on both sides. In this case, two magnetic heads 9a and 9b are installed in the magnetic reader 1 to read magnetic data, but a fraudulent magnetic reader may also install two magnetic heads 12a and 12b to steal the magnetic data. There is. Even in this case, by disposing the two loop antennas 2a and 2b obliquely with respect to the card conveyance path 10, respectively, it becomes possible to efficiently disturb the reading of the illegitimate magnetic information by the magnetic heads 12a and 12b. .

When two magnetic heads 9a and 9b are installed in the magnetic reader 1 as shown in FIG. 14, the strengths of the disturbing magnetic fields 11a and 11b generated from the two loop antennas 2a and 2b as shown in FIG. (FIG. 8 (a)), frequency (FIG. 8 (b)) or generation timing (FIG. 8 (c)) may be different.

As described above, by making the strengths, frequencies, and generation timings of the disturbing magnetic fields 11a and 11b generated from the loop antennas 2a and 2b different from each other, the magnetic heads 12a and 12b possessed by the illegitimate magnetic reader can be viewed Interference magnetic field of the Because of this, the fraudulent magnetic reader can not take measures to remove the disturbing magnetic field 11 such as filtering, and the magnetic information is more than when the magnetic heads 12a and 12b of the fraudulent magnetic reader are in a single magnetic field. Theft is difficult. Further, since the magnetic heads 9a and 9b of the magnetic reader 1 itself deviate from the direction of generation of the disturbing magnetic fields 11a and 11b, it is possible to read magnetic information without being affected by the disturbing magnetic field.

Furthermore, as shown in FIG. 15, two loop antennas 2a and 2b of FIG. 5C may be arranged diagonally in the left-right direction in the magnetic reader 1. Similar to FIG. 7, the loop antenna 2b is disposed inside the loop antenna 2a, and generates interference magnetic fields 11a and 11b in different directions.

As described above, the strength, frequency or generation timing of the disturbing magnetic fields 11a and 11b generated from the two loop antennas 2a and 2b may be different. Also in this case, since magnetic fields from a plurality of directions are superimposed on the magnetic head 12 of the fraudulent magnetic reader, stealing of magnetic information becomes more difficult than when in a single magnetic field. Also in this case, the magnetic heads 9a and 9b of the magnetic reader 1 itself are out of the direction in which the disturbing magnetic fields 11a and 11b are generated, so that magnetic information can be read without being affected by the disturbing magnetic field.

Furthermore, as shown in FIG. 16, an L-shaped core 14 may be installed on the loop antenna 2 of FIG. 5 (c). The material of the core 14 is a material having a large permeability such as ferrite. When the core 14 is installed, the disturbing magnetic field 11 radiated from the loop antenna 2 toward the inside of the magnetic reader 1 is absorbed, and the disturbing magnetic field 11 is radiated to the front side of the insertion slot 4.

Therefore, by providing the core 14, the disturbance magnetic field 11 radiated from the loop antenna 2 to the front surface of the insertion slot 4 can be made larger and the influence on the inside of the magnetic reader 1 can be suppressed. Although two cores 14 are installed in FIG. 16, only one of them may be installed. When one core 14 is installed, the effect is reduced as compared with the case where two cores 14 are installed, but the same effect as when two cores 14 are installed can be obtained.

Further, as shown in FIG. 17, the L-shaped core 14 may be installed obliquely to the card transfer surface. With such an arrangement, it is possible to more efficiently radiate the disturbing magnetic field 11 to the magnetic head 12 of the fraudulent magnetic reader. In particular, by arranging the core 14 along the direction of the disturbing magnetic field 11 generated by the loop antenna 2, the magnetic field on the side of the magnetic head 12 of the unauthorized magnetic reader is intensified and the influence on the inside of the magnetic reader 1 is suppressed. be able to.

Further, as shown in FIG. 18, one loop antenna 2 may be disposed obliquely in the vertical and horizontal directions with respect to the card conveyance surface. As described above, when the loop antenna 2 is inclined and installed in the direction of the magnetic head 12, the magnetic head 12 is largely affected by the disturbing magnetic field 11, and reading of the magnetic information of the card 3 becomes difficult. On the other hand, the magnetic head 9 possessed by the magnetic reader 1 itself deviates from the direction in which the disturbing magnetic field 11 is generated, so that the magnetic information can be read without being affected by the disturbing magnetic field 11.

Reference Signs List 1 magnetic reader 2, 2a, 2b loop antenna 3 card 4 card insertion slot 5, 6, 7, 8 transport roller 9, 9a, 9b magnetic head 10 card transport path 11, 11a, 11b disturbing magnetic field 13 magnetic stripe 14 core 37 Card slot unit

Claims (9)

It has a magnetic field generating coil attached so as to surround a card insertion slot into which a card is inserted, and generating a disturbing magnetic field to prevent reading of magnetic information from the outside of the card,
A magnetic reader, wherein a normal direction of an opening surface of the magnetic field generating coil is oblique to a transport surface of the card. The magnetic reader according to claim 1, wherein a normal direction of an opening surface of the magnetic field generating coil is disposed obliquely to a card conveyance surface. The magnetic reader according to any one of claims 1 and 2, wherein a normal direction of an opening surface of the magnetic field generating coil is formed in an oblique direction with respect to a card conveyance surface. The magnetic reader according to any one of claims 1 to 3, wherein the oblique direction is a direction oblique to the card transport surface in the vertical direction. The magnetic reader according to any one of claims 1 to 3, wherein the oblique direction is an oblique direction in the left-right direction with respect to the card conveyance surface. The magnetic reader according to any one of claims 1 to 3, wherein the oblique direction is a direction oblique to the card transport surface in the vertical and horizontal directions. The magnetic reader according to any one of claims 1 to 6, wherein a plurality of the magnetic field generating coils are provided, and each coil generates the disturbance magnetic field in another direction. Among the disturbing magnetic fields generated by the magnetic field generating coil, the magnetic field radiated from the card insertion slot to the outside of the magnetic reader is intensified, and the magnetic field radiated from the card slot to the inside of the magnetic reader The magnetic reader according to any one of claims 1 to 7, further comprising: a core member that causes directivity in a magnetic field generation direction of the disturbing magnetic field so as to weaken the magnetic field. The core member that causes directivity in the magnetic field generation direction of the disturbing magnetic field;
The magnetic reader according to claim 8, wherein the magnetic reader is disposed obliquely to the card conveyance surface.

Images