JP6082824B2 - Magnetic reader with loop antenna for generating disturbing magnetic field - Google Patents

Description

  The present invention relates to a magnetic reading device having a function of preventing illegal reading of magnetic data of a magnetic information recording medium and reading magnetic data of the magnetic information recording medium.

  Records cash transaction processing devices such as cash dispensers (CDs) and automated teller machines (hereinafter ATMs), and magnetic information such as cards and passbooks. A crime called skimming has occurred in a transaction processing terminal that performs transaction processing using the recorded medium. A typical skimming method is to illegally acquire the magnetic information of the magnetic stripe by installing an illegal magnetic reader having a magnetic head so as to cover the insertion slot of the magnetic information recording medium of the original magnetic reader. Is. As a countermeasure against this, a technique for preventing an illegal magnetic reader from functioning using a magnetic field has been disclosed.

  For example, Patent Document 1 discloses a magnetic card transaction apparatus that generates a magnetic field in an area of an outer portion of a card slot for inserting and ejecting a magnetic card and obstructs an illegal 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 generated by the magnetic field generating means. Can be prevented.

  Patent Document 2 discloses a magnetic reading device in which a loop antenna is installed around the insertion opening of a magnetic information recording medium to obstruct magnetic information reading in front of the insertion opening. In the magnetic reading device, 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 a medium detection for detecting the magnetic information recording medium inserted in the insertion slot 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 preventing 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 Patent Document 1, since the magnetic field generator generates a magnetic field in a region including a passage path through which the magnetic stripe of the magnetic card passes in the outer portion of the card slot, skimming can be prevented. The magnetic reading unit of the magnetic reading device main body also irradiates a disturbing magnetic field. In order to prevent this, there is also described a method in which the generation time of the magnetic field is set at the time of insertion and ejection of the card. However, in this method, reading disturbance cannot be performed while the magnetic reading device is performing magnetic reading.

  In Patent Document 2, a loop antenna attached so as to surround the card insertion slot is used as the magnetic field generating unit. However, even in this case, the magnetic reading unit of the magnetic reader main body has a disturbing magnetic field. Will interfere with its own magnetic reading.

  Further, in Patent Document 3, it is considered that the magnetic field generation unit is installed in a different direction from the magnetic reading unit included in the magnetic reading device main body, so that it does not interfere with its own magnetic reading. 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 obstructs magnetic reading by an illegal magnetic reading device without obstructing magnetic reading in the main body of the magnetic reading device.

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

  According to the present invention, when an illegal magnetic reading device is installed in the magnetic reading device, magnetic reading by the illegal magnetic reading device can be effectively obstructed without disturbing 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 which concerns 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 upper surface of the magnetic reader concerning the embodiment. It is a figure showing an example at the time of arranging 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 the 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 the L-shaped core to the two loop antennas concerning the embodiment in the diagonal direction with respect to the card conveyance surface. It is the schematic which shows the internal structure of the magnetic reader which has arrange | positioned the loop antenna formed diagonally according to 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 arranging the loop antenna formed diagonally concerning the same embodiment 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 formed diagonally concerning the embodiment. It is a figure which shows the example at the time of adding an L-shaped core in the diagonal direction with respect to the card | curd conveyance surface to the two loop antennas formed diagonally 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 up-down-left-right direction.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

(1) First Embodiment (1-1) Configuration of Magnetic Reading Device First, the configuration of the magnetic reading device 1 according to the present embodiment will be described. The magnetic reading device 1 is a transaction processing that performs transaction processing using a cash transaction processing device 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. A device that is provided in a terminal or the like and reads magnetic data on a magnetic card.

  FIG. 1 is a block diagram showing the configuration of the main part of the magnetic reading apparatus 1. As shown in FIG. 1, the magnetic reading device 1 includes a control unit (CPU) 32 that controls the operation of the main body, a magnetic information reading unit 33 that reads magnetic data recorded on a magnetic card inserted into the main body, A card transport path 10 for transporting a card inserted into 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, and a host A host interface 36 that is a connection with the apparatus, a card insertion slot unit 37 installed on the front surface of the main body, and a loop antenna 2 installed in the card insertion slot unit 37 to generate a magnetic field (one or more conductors) An antenna wound in a loop shape), a magnetic field control unit 38 for controlling the operation of the loop antenna 2, and a card conveyance control unit 3 for controlling card conveyance. It is configured to include the, the.

  FIG. 2 is a schematic diagram showing the internal structure of the magnetic reading apparatus 1. In FIG. 2, reference numeral 3 denotes a magnetic card (hereinafter referred to as 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 slot 4 into which the card 3 is inserted is formed on the front surface of the magnetic reader 1 main body. An insertion detection sensor 41 that detects the card 3 inserted into the insertion slot 4 is provided near the insertion slot 4. The insertion detection sensor 41 is a pressure sensor and is disposed at a position pressed by the card 3 inserted from the insertion port 4.

  A pair of transport rollers 5 to 8 that sandwich and transport the card 3 are arranged in the transport direction of the card 3. The magnetic reading device 1 forms a card 3 conveyance path as a card conveyance path 10 by these conveyance rollers 5 to 8. One of the pair of transport rollers 5 to 8 is a driving roller to which the rotational force of the motor is transmitted, and the other is a driven roller that is rotated by the driving roller. There is one motor (not shown) that drives the transport rollers 5 to 8.

  The card transport control unit 39 takes in the card 3 and ejects (returns) the card by controlling the rotation (including the rotation direction and rotation speed) and stop of the motor. The magnetic information reading unit 33 includes a magnetic head 9 that reads 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 so as to be in contact with the card transport path 10 and reads 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 conveyance 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 optical sensors each composed of a light emitting unit and a light receiving unit (both not shown), and are arranged with the light emitting unit and the light receiving unit facing each other across the conveyance path.

  The sensor 51 detects that the card 3 is sandwiched between the transport rollers 5 closest to the insertion slot 4. Sensors 52, 53, and 54 detect the position of the card 3 being conveyed through the card conveyance path 10. Whether the card 3 is inserted in the main body is detected from the detection results of the insertion detection sensor 41 and the sensors 51 to 54, and the position of the card 3 in the transport path is detected.

  The illegal magnetic reader (not shown) includes a magnetic head 12 for reading magnetic information of the card 3. The location where the criminal installs the illegal magnetic reader is indefinite, but the purpose is to read the magnetic information of the card 3 inserted or ejected into the magnetic reader 1, so that the magnetic head 12 is in front of the insertion slot 4. Of the positions in contact with the extension line of the card transport path 10, the card 3 is installed on the side where the magnetic stripe 13 exists (the same side as the magnetic head 9).

  A loop antenna 2 is provided at the insertion port 4 of the magnetic reading device 1 so as to surround the periphery thereof. The loop antenna 2 is disposed obliquely in the vertical direction with respect to the card transport path 10. For example, as shown in FIG. 3, the magnetic head 9 is arranged so as not to enter the range in the normal direction from the opening surface of the loop antenna 2. When a drive signal is applied to both ends of the loop antenna 2, the loop antenna 2 generates a disturbing magnetic field 11 near the insertion opening 4.

  The disturbing magnetic field 11 prevents the magnetic information of the magnetic card 3 from being stolen by the magnetic head 12 of the unauthorized magnetic information reader attached to the front surface 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 is present. The disturbing magnetic field 11 is generated from the opening surface of the loop antenna 2 in the normal direction. Therefore, by arranging the loop antenna 2 as shown in FIG. 3 and changing the direction in which the disturbing magnetic field 11 is generated, theft of magnetic information can be more efficiently prevented.

  The normal direction of the opening surface of the loop antenna 2 is obliquely arranged in the vertical direction so as to be away from the card transport path 10. For this reason, the magnetic head 9 disposed so as to be in contact with the card transport path 10 in the magnetic reader 1 is not affected by the disturbing magnetic field 11 and can read magnetic information as usual.

  In FIG. 3, the magnetic head 9 is completely removed from the normal direction of the opening surface of the loop antenna 2, but the disturbing magnetic field 11 increases as the center of the opening direction of the loop antenna 2 approaches the normal direction. Therefore, even if the angle of the loop antenna 2 is slightly inclined, there is an effect of reducing the influence of the disturbing magnetic field 11.

  As shown in FIG. 3B, the core member 61 that suppresses the influence of the disturbing magnetic field 11 to the inside of the magnetic reading device 1 is disposed, or the loop antenna 2 and the magnetic head 9 are sufficiently separated, so that the loop antenna is obtained. It is also possible to reduce the angle at which 2 is inclined. As a material of the core member 61, a material having a high magnetic permeability such as ferrite may be used.

(1-2) Loop antenna and disturbing magnetic field Next, with reference to FIG. 4, the installation of the conventional technique and the loop antenna of the present embodiment will be described.

  4 (a) to 4 (c) are diagrams for explaining the installation of the 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 transport path 10 and is arranged obliquely in the vertical direction toward the expected installation location of the magnetic head 12. In FIG. 4B, since the installation space for the loop antenna 2 becomes large, it is necessary to greatly change the shape of the card insertion slot unit 37. FIG. 4C shows a 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. The case where the loop antenna 2 shown in FIG. 4C is deviated from the card conveyance path 10 and is arranged obliquely in the vertical direction toward the expected installation location of the magnetic head 12 is shown. 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, the size of the loop antenna 2 itself and the necessary installation space need to be changed as compared with the case where the loop antenna is arranged as shown in FIG. You can see that there is no.

  Next, an installation space for the loop antenna 2 will be described with reference to FIG. FIG. 5A is a diagram showing a conventional technique in which the loop antenna 2 is installed in the same direction as the card transport path 10. FIG. 5B is a diagram showing a case where the loop antenna 2 of the present embodiment is arranged so as to be diverted from the direction of the card transport path 10. FIG. 5C is a diagram illustrating a case where the conductor of the loop antenna 2 is wound while being shifted, and is a diagram illustrating a second embodiment to be described later. In FIG. 5 (c), the shape of the loop antenna 2 itself is formed obliquely with respect to the direction of the card transport path 10.

  As described above, the required installation space is almost the same between FIG. 5A and FIG. 5B, but FIG. 5B requires a little more space. The need for a large installation space can be solved by slightly reducing the size of the loop antenna 2. However, with a small loop antenna, it is difficult to generate the disturbing magnetic field 11 far away. Therefore, as shown in FIG. 5 (c), by forming the shape of the loop antenna 2 diagonally, the disturbing magnetic field can be saved more space than in FIG. 5 (b) without changing the size of the loop antenna 2. 11 generation direction can be changed.

  Further, the loop antenna 2 may be disposed obliquely in the left-right direction with respect to the insertion direction of the card 3. FIG. 6 is a view of the magnetic reading apparatus 1 as viewed from above. 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 slot 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 passing surface of the magnetic stripe 13 of the card 3. For this reason, the illegal magnetic information reading device is installed close to one side in the left-right direction from the center of the insertion port 4. Therefore, when the loop antenna 2 is tilted in the direction of the magnetic head 12, the magnetic head 12 is greatly affected by the disturbing magnetic field 11 and it is difficult to read the magnetic information on the card 3. On the other hand, the magnetic head 9 of the magnetic reader 1 itself deviates from the direction in which the disturbing magnetic field 11 is generated, so that it is possible to read magnetic information without being affected by the disturbing magnetic field 11.

  Further, as shown in FIG. 7, the magnetic reader 1 may be provided with two loop antennas 2 a and 2 b. In FIG. 7, the loop antenna 2b is disposed inside the loop antenna 2a, and generates disturbing 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 reading device 1 to read magnetic data. However, an illegal magnetic reading device may also have two magnetic heads 12a and 12b installed to steal magnetic data. There is. Even in this case, by disposing the two loop antennas 2a and 2b obliquely with respect to the card transport path 10, it becomes possible to efficiently prevent unauthorized reading of magnetic information by the magnetic heads 12a and 12b, respectively. .

  As shown in FIG. 7, when two magnetic heads 9a and 9b are installed in the magnetic reading device 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 a case where the intensity, frequency or generation timing of the disturbing magnetic fields 11a and 11b generated from the loop antennas 2a and 2b are different.

  For example, FIG. 8A shows a 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 a case where the frequencies of the disturbing magnetic fields 11a and 11b generated from the loop antennas 2a and 2b are different. FIG. 8C shows a case where the generation timings of the disturbing magnetic fields 11a and 11b generated from the loop antennas 2a and 2b are different.

  By making the strength, frequency, and generation timing of the disturbing magnetic fields 11a and 11b generated from the loop antennas 2a and 2b different, disturbing magnetic fields from a plurality of directions are generated with respect to the magnetic heads 12a and 12b of the illegal magnetic reader. Superimpose. For this reason, the illegal magnetic reader cannot take a means for removing the interference magnetic field 11 such as filtering, and more magnetic information than when the magnetic heads 12a and 12b of the illegal magnetic reader are in a single magnetic field. Theft becomes difficult. Further, since the magnetic heads 9a and 9b of the magnetic reading device 1 itself deviate from the direction in which the disturbing magnetic fields 11a and 11b are generated, the magnetic information can be read without being affected by the disturbing magnetic fields.

  Further, as shown in FIG. 9, two loop antennas 2 a and 2 b may be arranged obliquely in the left-right direction in the magnetic reading device 1. Similar to FIG. 7, the loop antenna 2b is disposed inside the loop antenna 2a, and generates disturbing magnetic fields 11a and 11b in different directions. As described above, the intensity, 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 illegal magnetic reader, it is more difficult to steal magnetic information than when the magnetic head 12 is in a single magnetic field. Also in this case, the magnetic heads 9a and 9b possessed by the magnetic reading device 1 itself deviate from 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 fields.

  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 high magnetic 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 reading device 1 is absorbed, and the disturbing magnetic field 11 is radiated to the front side of the insertion opening 4. Therefore, by providing the core 14, the disturbing magnetic field 11 radiated from the loop antenna 2 to the front surface of the insertion port 4 can be further increased, and the influence on the inside of the magnetic reading apparatus 1 can be suppressed.

  In addition, in FIG. 10, although the two cores 14 are installed, you may install only either one side. 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.

  Moreover, as shown in FIG. 11, you may install the L-shaped core 14 diagonally with respect to a card conveyance surface. With such an arrangement, it is possible to more efficiently radiate the disturbing magnetic field 11 to the magnetic head 12 of the illegal 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 toward the magnetic head 12 of the unauthorized magnetic reader is strengthened, and the influence on the inside of the magnetic reader 1 is affected. Can be suppressed.

(2) Second Embodiment (2-1) Configuration of Magnetic Reading Device Next, as shown in FIG. 5 (c), generated from the loop antenna 2 when the conductor wire of the loop antenna 2 is shifted and wound. The magnetic field to be described will be described. Since the configuration of the magnetic reading apparatus 1 according to the present embodiment is substantially the same as that of the first embodiment, a configuration different from the first embodiment will be described in detail.

(2-2) Loop antenna and disturbing magnetic field FIG. 12 shows a 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 winding the lead wire of the loop antenna 2 while shifting it. FIG. As shown in FIG. 12, the shape of the loop antenna 2 is wound with the conducting wire shifted in the same manner as in FIG.

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

  Furthermore, as shown in FIG. 13, the loop antenna 2 of FIG. 5C may be arranged 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, it is necessary to install the magnetic head 12 of the illegal magnetic information reader on the passage surface of the magnetic stripe 13 of the card 3.

  For this reason, it installs in one side from the center of the insertion port 4 in the left-right direction. Therefore, when the loop antenna 2 is tilted in the direction of the magnetic head 12, the magnetic head 12 is greatly affected by the disturbing magnetic field 11 and it is difficult to read the magnetic information on the card 3. On the other hand, the magnetic head 9 of the magnetic reader 1 itself deviates from the direction in which the disturbing magnetic field 11 is generated, so that it is possible to read magnetic information without being affected by the disturbing magnetic field 11.

  Furthermore, as shown in FIG. 14, it is good also as a structure which installs the two loop antennas 2a and 2b of FIG.5 (c). In FIG. 14, the loop antenna 2b is disposed inside the loop antenna 2a, and generates disturbing 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 reading device 1 to read magnetic data. However, an illegal magnetic reading device may also have two magnetic heads 12a and 12b installed to steal magnetic data. There is. Even in this case, by disposing the two loop antennas 2a and 2b obliquely with respect to the card transport path 10, it becomes possible to efficiently prevent unauthorized reading of magnetic information by the magnetic heads 12a and 12b, respectively. .

  As shown in FIG. 14, when two magnetic heads 9a and 9b are installed in the magnetic reading device 1, the strength of the disturbing magnetic fields 11a and 11b generated from the two loop antennas 2a and 2b, respectively, as shown in FIG. (FIG. 8A), frequency (FIG. 8B), or generation timing (FIG. 8C) may be different.

  Thus, 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, the magnetic heads 12a and 12b of the unauthorized magnetic reader can be viewed from a plurality of directions. The disturbing magnetic field is superimposed. For this reason, the illegal magnetic reader cannot take a means for removing the interference magnetic field 11 such as filtering, and more magnetic information than when the magnetic heads 12a and 12b of the illegal magnetic reader are in a single magnetic field. Theft becomes difficult. Further, the magnetic heads 9a and 9b possessed by the magnetic reading device 1 itself deviate from 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 fields.

  Further, as shown in FIG. 15, the two loop antennas 2 a and 2 b of FIG. 5C may be disposed obliquely in the left-right direction in the magnetic reading device 1. Similar to FIG. 7, the loop antenna 2b is disposed inside the loop antenna 2a, and generates disturbing 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 illegal magnetic reader, it is more difficult to steal magnetic information than when the magnetic head 12 is in a single magnetic field. Also in this case, the magnetic heads 9a and 9b possessed by the magnetic reading device 1 itself deviate from 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 fields.

  Further, as shown in FIG. 16, an L-shaped core 14 may be installed on the loop antenna 2 of FIG. The material of the core 14 is a material having a high magnetic 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 reading device 1 is absorbed, and the disturbing magnetic field 11 is radiated to the front side of the insertion opening 4.

  Therefore, by providing the core 14, the disturbing magnetic field 11 radiated from the loop antenna 2 to the front surface of the insertion port 4 can be further increased, and the influence on the inside of the magnetic reader 1 can be suppressed. In FIG. 16, two cores 14 are installed, but 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.

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

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

DESCRIPTION OF SYMBOLS 1 Magnetic reader 2, 2a, 2b Loop antenna 3 Card 4 Card insertion slot 5, 6, 7, 8 Conveyance roller 9, 9a, 9b Magnetic head 10 Card conveyance path 11, 11a, 11b Interfering magnetic field 13 Magnetic stripe 14 Core 37 Card slot unit

Claims (15)

A magnetic field generating coil that is attached so as to surround a card insertion slot into which a card is inserted and generates a disturbing magnetic field to prevent reading of magnetic information from the outside of the card;
The magnetic reading device according to claim 1, wherein the magnetic field generating coil is formed such that the normal direction of the opening surface thereof is inclined with respect to the card conveying surface. The magnetic reading apparatus according to claim 1, wherein the oblique direction is an oblique direction in a vertical direction with respect to the card transport surface. The magnetic reading apparatus according to claim 1, wherein the oblique direction is an oblique direction in the left-right direction with respect to the card transport surface. The magnetic reading device according to claim 1, wherein the oblique direction is an oblique direction in the vertical and horizontal directions with respect to the card conveying surface. The magnetic reading device according to claim 1, wherein a plurality of the magnetic field generating coils are provided, and each of the coils generates the disturbing magnetic field in a different direction. Of the disturbing magnetic field generated by the magnetic field generating coil, a magnetic field radiated from the card insertion slot toward the outside of the magnetic reader is strengthened, and a magnetic field radiated from the card insertion slot to the inside of the magnetic reader. The magnetic reading device according to claim 1, further comprising: a core member that generates directivity in a magnetic field generation direction of the disturbing magnetic field so as to weaken a magnetic field. The core member that generates directivity in the magnetic field generation direction of the disturbing magnetic field,
The magnetic reading device according to claim 8, wherein the magnetic reading device is disposed obliquely with respect to the card conveying surface. A magnetic field generating coil that is attached so as to surround a card insertion slot into which a card is inserted and generates a disturbing magnetic field to prevent reading of magnetic information from the outside of the card;
The magnetic field generating coil has a shape itself whose normal line direction is an oblique direction with respect to the card conveying surface,
A magnetic reading apparatus comprising a plurality of the magnetic field generating coils, each of which generates the disturbing magnetic field in a different direction. The magnetic reading device according to claim 10, wherein the normal direction of the opening surface of the magnetic field generating coil is disposed obliquely with respect to the card transport surface. The magnetic reading device according to claim 10, wherein the normal direction of the opening surface of the magnetic field generating coil is formed obliquely with respect to the card transport surface. The magnetic reading apparatus according to claim 10, wherein the oblique direction is an oblique direction in a vertical direction with respect to a card transport surface. The magnetic reading device according to any one of claims 10 to 12, wherein the oblique direction is an oblique direction in the left-right direction with respect to the card transport surface. The magnetic reading device according to claim 10, wherein the oblique direction is an oblique direction in the vertical and horizontal directions with respect to the card transport surface. Of the disturbing magnetic field generated by the magnetic field generating coil, a magnetic field radiated from the card insertion slot toward the outside of the magnetic reader is strengthened, and a magnetic field radiated from the card insertion slot to the inside of the magnetic reader. The magnetic reading device according to claim 10, further comprising: a core member that generates directivity in a magnetic field generation direction of the disturbing magnetic field so as to weaken a magnetic field. The core member that generates directivity in the magnetic field generation direction of the disturbing magnetic field,
The magnetic reading device according to claim 16, wherein the magnetic reading device is disposed obliquely with respect to the card transport surface.

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