CN102982613A - Magnetic reader - Google Patents

Abstract

The invention provides a magnetic reading device, and the magnetic information recorded on the magnetic recording medium will not be stolen by the illegal magnetic reading device. Possess: a foreign object detecting part, detecting whether there is a foreign object near the card insertion port for inserting or ejecting the magnetic card; a magnetic field generating part, near the card insertion port, generating an obstructing magnetic field for obstructing the magnetic field emitted from the foreign object; and control A unit that determines whether the foreign object detection unit has detected a foreign object, and shifts the strength of the interfering magnetic field generated by the magnetic field generation unit when it is determined that the foreign object detection unit has detected the foreign object.

Description

magnetic reading device

This application is a divisional application of an application whose filing date is January 18, 2011, application number is 201110009949.4, and the name of the invention is a magnetic reading device.

technical field

The invention relates to a magnetic reading device, which has the function of preventing illegal reading of magnetic data of a magnetic information recording medium, and reads the magnetic data of the magnetic information recording medium.

Background technique

There is the following crime A called skimming: Cash transaction processing devices such as automatic teller machines (hereinafter referred to as CD (Cash Dispenser)) and cash automatic teller machines (hereinafter referred to as ATM (Automated Teller Machine)), and In a transaction processing terminal that utilizes a card or passbook or other media that has recorded magnetic information for transaction processing, an illegal magnetic reading device equipped with a magnetic head is set to cover the insertion port of the magnetic information recording medium of the original magnetic reading device. to obtain the magnetic information of the magnetic stripe. As its countermeasures, various technologies such as countermeasures 1 to 3 have been disclosed. Countermeasure 1 is to detect an installed illegal magnetic reading device, and countermeasure 2 is to intermittently drive the magnetic information recording medium to take in and return, thereby enabling It is difficult for an illegal magnetic reading device to read magnetic data, and countermeasure 3 is to disable the illegal magnetic reading device by using a magnetic field.

As one of such techniques, there is a magnetic card transaction device in which a magnetic field is generated in an area outside a card slot for inserting and ejecting a magnetic card, thereby obstructing an illegal magnetic reading device (for example, refer to Patent Document 1). In this magnetic card transaction device, even if a magnetic head is illegally installed outside the card slot, the interference magnetic field of the magnetic field generating mechanism can prevent the use of an illegal magnetic head from reading the inserted or removed magnetic card.

In addition, there is a magnetic reading device in which a loop antenna is provided around an insertion opening of a magnetic information recording medium to prevent magnetic information reading in front of the insertion opening (see Patent Document 2). In this magnetic reading device, it is equipped with: a loop antenna installed so as to surround the periphery of the magnetic information recording medium; an oscillator for generating a magnetic field from the loop antenna; and a medium detection sensor for detecting the magnetic information recording medium inserted into the insertion port. ; When the medium detection sensor detects the magnetic information recording medium, the oscillator generates a magnetic field from the loop antenna, which can hinder the magnetic data reading of the magnetic information recording medium in front of the insertion port.

Patent Document 1: Japanese Patent Laid-Open No. 2001-67524

Patent Document 2: Japanese Patent Laid-Open No. 2005-266999

In the above-mentioned Patent Document 1, the magnetic field generation unit generates a magnetic field in the area including the passing path of the magnetic stripe of the magnetic card in the outer part of the card slot, but there is no specific disclosure of what kind of magnetic field is generated, and in the illegal magnetic reading device When the magnetic field from the magnetic field generating part is blocked (such as a magnetic plate, etc.), there is a problem that the magnetic data may be read by an illegal magnetic reading device.

And, as shown in FIG. 11 , the generation timing of the magnetic field is made to be when the magnetic information recording medium is inserted and when it is ejected. Therefore, the period from when the user inserts the magnetic information recording medium to when the insertion of the magnetic information recording medium is detected (A in FIG. 11 ), and from when the magnetic information recording medium is removed to when the user pulls out the magnetic information recording medium During the period (B of FIG. 11 ), there is a problem that an illegal magnetic reading device can read magnetic information.

In addition, in Patent Document 2, a loop antenna installed so as to surround the insertion opening is used as the magnetic field generator, and magnetic fields of a plurality of frequencies are generated. However, as in the case of Patent Document 1, when the illegal magnetic reading device is installed to block the magnetic field, there is a problem that the illegal magnetic reading device can read magnetic information.

Contents of the invention

The object of the present invention is to provide a magnetic reading device, even if the illegal magnetic reading device is set to block the magnetic field, the magnetic information recorded on the magnetic recording medium will not be stolen by the illegal magnetic reading device.

In order to achieve the above object, the magnetic reading device of the present invention is characterized in that, it is equipped with: a foreign object detection part, detecting whether there is a foreign object near the card insertion port for inserting or discharging the magnetic card; a magnetic field generating part, near the above-mentioned card insertion port, generating an interfering magnetic field for interfering with a magnetic field emitted from the foreign object; and a control unit that determines whether the foreign object detecting unit has detected a foreign object, and causes the magnetic field generating unit to generate The aforementioned hinders the displacement of the strength of the magnetic field.

The effect of the invention is:

According to the present invention, a magnetic reading device is provided, even if the illegal magnetic reading device is set to block the magnetic field, the magnetic information recorded on the magnetic recording medium will not be stolen by the illegal magnetic reading device.

Description of drawings

FIG. 1 is a block diagram showing the configuration of a main part of a magnetic reading device according to the present embodiment.

(a) of FIG. 2 is a schematic diagram showing the internal structure of the magnetic reading device according to this embodiment, (b) is a diagram showing the positional relationship between the insertion port and the iron core, and (c) is a diagram showing the upper and lower sides of the insertion port. A diagram of an example of a case where a loop antenna is arranged.

(a) of FIG. 3 is a flowchart showing the processing procedure of the initial operation after the magnetic reading device is powered on, and (b) is a flowchart showing the processing procedure of the foreign object detection processing.

FIG. 4 is a flowchart showing a processing procedure when the magnetic reading device according to the present embodiment performs a card taking operation or a reading operation.

FIG. 5 is a flowchart showing a processing procedure when the magnetic reader device of this embodiment performs a card return operation.

FIG. 6 is a diagram showing how the magnetic field generating unit is controlled to increase the current flowing through the loop antenna to increase the generated magnetic field.

FIG. 7 is a diagram showing how a magnetic field control unit changes a frequency when a foreign object detection unit detects a foreign object.

FIG. 8 is a block diagram showing a configuration of a main part of a magnetic reading device provided with a galvanometer.

FIG. 9 is a flowchart of processing procedures of a card taking operation and a reading operation when no iron core is provided.

(a) of FIG. 10 is a time chart of the magnetic field generated by the magnetic field generating unit to the front side of the insertion port, and (b) is a time chart of the magnetic field generated by the magnetic field generating unit when the process of the flowchart shown in FIG. 9 is performed. time chart.

FIG. 11 is a diagram showing generation times of a conventional magnetic field.

Symbol Description:

1 magnetic reading device

2 control unit (CPU)

3 Magnetic information reading unit

4 card transfer way

5 card position sensor

6 memory

7 host interface

8 Magnetic Field Generator

9 Magnetic field control department

10 Foreign Object Detection Department

11 Foreign matter control department

12 galvanometer

21 magnetic card

22 card slot

23 card insertion detection sensor

24 card slot unit

29 heads

34 iron core

35, 35a, 35b loop antenna

36 foreign object detection sensor

40 card transport control unit

50 customer detection sensors

Detailed ways

Hereinafter, an embodiment of the magnetic reading device of the present invention will be described in detail with reference to FIGS. 1 to 11 .

FIG. 1 is a block diagram showing the configuration of a main part of a magnetic reading device 1 according to the present embodiment. The magnetic reading device 1 is composed of: a control unit (CPU) 2, which controls the action of the main body; a magnetic information reading unit 3, which reads the magnetic data recorded by the magnetic card inserted into the main body; The card of the main body; the card position sensor 5 detects the position of the card on the card conveying path 4; the memory 6 stores the magnetic information read by the magnetic information reading part 3; the host interface 7 is used as a connection part with the host device; the card The insertion port unit 24 is arranged on the front part of the main body; the magnetic field generating part 8 is arranged in the card insertion port unit 24 to generate a magnetic field; the magnetic field control part 9 controls the action of the magnetic field generating part 8; the foreign object detection part 10 is provided In the card insertion port unit 24, foreign matter that is arranged on the outside of the magnetic reading device 1 is detected; the foreign matter detection control unit 11 controls the operation of the foreign matter detection unit 10; the card transport control unit 40 controls the transport of the card; and customer detection The sensor 50 is used to detect a user.

(a) of FIG. 2 is a schematic diagram showing the internal structure of the magnetic reading device 1 of the present embodiment. In (a) of FIG. 2 , symbol 21 is a magnetic card (hereinafter referred to as card 21 ). An insertion opening 22 into which a card 21 is inserted is formed on the front surface of the main body of the magnetic reading device 1 . Near the insertion port 22 is provided an insertion detection sensor 23 that detects the card 21 inserted into the insertion port 22 . The insertion detection sensor 23 is a pressing sensor, and is disposed at a position pressed by the card 21 inserted through the insertion port 22 .

Furthermore, a pair of conveyance rollers 25 to 28 that sandwich and convey the card 21 are arranged in the conveyance direction of the card 21 . The magnetic reader 1 serves as the card conveyance path 4 , and these conveyance rollers 25 to 28 form a conveyance path for the card 21 . The pair of conveying rollers 25 to 28 is a driving roller to which a rotational force of a motor is transmitted, and the other is a driven roller that is driven and rotated by the driving roller. There is one motor (not shown) for driving the conveying rollers 25 to 28 .

The card transport control unit 40 controls the rotation (including the rotation direction and the rotation speed) and the stop of the motor to take in the card 21 and remove (return) the card. The magnetic information reading unit 3 has a magnetic head 29 for reading the magnetic information recorded on the magnet of the card 21 conveyed by the card conveyance path 4 formed by the conveyance rollers 25 to 28 . In addition, sensors 30 to 33 for detecting the presence or absence of the card 21 are arranged along the conveyance path of the card 21 . The arrangement intervals of the sensors 30 to 33 are shorter than the length of the card 21 in the transport direction. The sensors 30 to 33 are optical sensors composed of a light emitting unit and a light receiving unit (both not shown), and the light emitting unit and the light receiving unit are arranged to face each other across the conveyance path.

The sensor 30 is used to detect that the conveyance roller 25 closest to the insertion port 22 has nipped the card 21 . Furthermore, the sensor 33 is used to detect that the card 21 inserted into the main body has reached a storage portion (not shown) for temporarily holding the card 21 . The sensors 31 and 32 are used to detect the position of the card 21 conveyed on the card conveyance path 4 . Based on the detection results of the insertion detection sensor 23 and the sensors 30 to 33 , whether or not the card 21 is inserted into the main body and the position of the card 21 on the transport path are detected. And, the disposition interval between the magnetic head 29 and the sensor 33 is slightly longer than the length in the conveying direction of the card 21, so when the card 21 reaches the storage portion, that is, when the front end of the card 21 reaches the position detected by the sensor 33, the magnetic information reading is performed. The fetching unit 3 finishes reading the magnetic data recorded on the card 21 .

In addition, a foreign object detection sensor 36 is provided on the front surface of the magnetic reading device 1 , and outputs a signal (detection signal) indicating detection of a foreign object to the control unit 2 when a foreign object is installed in front of the insertion port 22 .

An iron core 34 is provided on the front surface of the magnetic reader 1 so as to surround the insertion port 22 . The diagram of the left part in (a) of FIG. 2 is a diagram showing a state where the iron core 34 surrounds the insertion opening 22 . A loop antenna 35 (an antenna in which a conductor is wound in one or more turns) is provided so as to surround the insertion port 22 . The material of the iron core 34 is a material with high magnetic permeability such as ferrite. FIG. 2( b ) is a diagram showing the positional relationship between the insertion opening 22 and the iron core 34 . As shown in FIG. 2( b ), the iron core 34 has a shape that surrounds the insertion opening 22 and covers the rear of the loop antenna 35 (the magnetic head 29 side of the magnetic reading device 1 ). The loop antenna 35 is provided to surround the iron core 34 . When a drive signal is applied from the magnetic field control unit 9 to both ends of the loop antenna 35 , the loop antenna 35 generates a magnetic field around the insertion opening 22 . This magnetic field hinders the theft of the magnetic information of the magnetic card 21 by an illegal magnetic information reading device installed in front of the insertion port 22 .

The iron core 34 is arranged in an L-shape (or an inverted L-shape) as shown in (a) of FIG. . Therefore, by providing the iron core 34 , it is possible to suppress the influence of the magnetic field radiated from the loop antenna 35 on the inside of the magnetic reader 1 . That is, since the influence of the magnetic field on the card 21 and the magnetic head 29 inserted from the insertion port 22 and conveyed on the conveyance path can be suppressed, the magnetic head 29 can read the magnetic information of the card 21 without being affected by the magnetic field.

Moreover, since the iron core 34 is arrange|positioned in the above-mentioned shape, the magnetic field radiated to the front side of the insertion opening 22 can be enlarged. And, by always providing such an iron core 34 , as shown in FIG. 10( a ), it is possible to always generate a magnetic field on the front side of the insertion opening 22 in advance. Furthermore, as will be described later, the magnetic field radiated from the loop antenna 35 can be varied and increased, so that the current flowing through the loop antenna 35 can be reduced, and the power consumed by the main body of the magnetic reading device 1 can be suppressed.

In addition, in the following description, although the loop antenna 35 is arranged to surround the iron core 34, as shown in FIG. Location). In this case, a plurality of magnetic field generators 8 are provided according to the number of loop antennas 35 to generate a larger magnetic field than when the loop antennas 35 are arranged around the iron core 34, thereby more effectively preventing illegal magnetic reading devices. Furthermore, in the case of (c) of FIG. 2 , the magnetic field control unit 9 may be set to generate magnetic fields with different frequencies from the plurality of magnetic field generating units 8 . At this time, the energy lost by the magnetic field with a lower frequency due to iron loss is reduced, and the illegal magnetic reading device can be hindered more effectively.

Next, the operation of the magnetic reading device 1 of this embodiment will be described. (a) of FIG. 3 is a flowchart showing the processing procedure of the initial operation after the magnetic reading device 1 is powered on. After the power is turned on, the magnetic field control unit 9 of the magnetic reading device 1 drives the magnetic field generating unit 8 to generate a magnetic field around the insertion opening 22 (step S1 ). Then, the foreign object detection control unit 11 of the magnetic reading device 1 drives the foreign object detection sensor 36 (step S2 ), and starts the foreign object detection process.

(b) of FIG. 3 is a flowchart showing the processing procedure of the foreign object detection processing. As shown in FIG. 3( b ), in the foreign object detection process, first, the foreign object detection control unit 11 determines whether or not the foreign object detection sensor 36 has detected a foreign object (step S31 ). Then, when the foreign object detection control unit 11 determines that the foreign object detection sensor 36 has detected a foreign object (step S31: Yes), the magnetic field control unit 9 increases the magnetic field generation unit 8 in the loop antenna 35 as shown in FIG. The way the current flows is controlled to increase the generated magnetic field (step S32). On the other hand, when the foreign object detection control part 11 judges that the foreign object detection sensor 36 has not detected a foreign object (step S31: NO), it just waits.

Thereafter, the foreign object detection control unit 11 judges whether the foreign object detection sensor 36 has become unable to detect a foreign object (step S33), and if it is determined that the foreign object detection sensor 36 has become unable to detect a foreign object (step S33: No), the magnetic field control unit 9. The magnetic field generator 8 is controlled so as to restore the current flowing through the loop antenna 35 (step S34 ), and the processing is terminated. In addition, when it is determined that the foreign object detection sensor 36 has detected a foreign object (step S33 : Yes), the magnetic field control unit 9 maintains the magnitude of the current flowing through the loop antenna 35 . When this step S34 ends, all the processes shown in FIG. 3( a ) and FIG. 3( b ) end.

In the example shown in FIG. 6 , when the magnetic field generator 8 increases the drive current to a value P2 greater than the drive current value P1 before the foreign object detection sensor 36 detects a foreign object, the foreign object detection sensor 36 becomes unable to detect it thereafter. In the case of a foreign object, the magnetic field generating unit 8 reduces the drive current to the drive current value P1 before the foreign object detection sensor 36 detects the foreign object. In this way, by increasing the magnetic field when the foreign object detection sensor 36 detects a foreign object, even if an illegal magnetic reading device (such as a magnetic foreign object) is installed in front of the insertion port 22, the illegal magnetic reading device can be detected. The reading device hinders illegal activities such as skimming of the magnetic reading device 1.

FIG. 4 is a flowchart showing a processing procedure when the magnetic reader 1 according to the present embodiment performs a card 21 taking operation or reading operation. Hereinafter, description will be made along this flowchart, but in the magnetic reader 1 , the card 21 is not detected by the insertion detection sensor 23 and the sensors 30 to 33 . Then, the magnetic field generator 8 supplies a drive current to the loop antenna 35 to radiate a magnetic field from the loop antenna 35 .

As shown in FIG. 4 , the control unit 2 judges whether the insertion detection sensor 23 has detected the card 21 (step S41), and when it is determined that the insertion detection sensor 23 has detected the card 21 (step S41: Yes), it is determined that the card 21 has been inserted, The card transport control unit 40 starts the rotation of the transport rollers 25 to 28 (step S42 ). On the other hand, when the control unit 2 determines that the card 21 has not been detected by the insertion detection sensor 23 (step S41 : NO), it directly waits.

In addition, in the process of step 42 described above, the transport rollers 25 to 28 rotate in the direction in which the inserted card 21 is taken into the main body (hereinafter referred to as the normal direction). Thereafter, the card transport control unit 40 transports the card 21 to the storage unit at a constant speed. When the card transport control unit 40 transports the card 21 to the storage unit, the magnetic head 29 contacts the magnetic stripe of the card 21, and the magnetic information reading unit 3 reads the magnetic data recorded on the card 21 (step 43).

The control unit 2 judges whether the sensor 33 disposed adjacent to the conveyance roller 28 has detected the card 21 (step S44 ), and if it is determined that the sensor 33 disposed adjacent to the conveyance roller 28 has detected the card 21 (step S44 : Yes) , it is determined that the transported card 21 has reached the rear end, and the card transport control unit 40 stops the rotation of the transport roller (step S45 ). On the other hand, when it is determined that the sensor 33 disposed adjacent to the conveyance roller 28 has not detected the card 21 (step S44 : NO), the standby is performed as it is. When this step S45 ends, all the processing shown in FIG. 4 ends.

Next, the operation (card returning operation) when returning the card 21 stored in the storage unit to the user will be described. FIG. 5 is a flowchart showing the processing procedure when the magnetic reader 1 according to the present embodiment performs the return operation of the card 21 .

First, the card transport control unit 40 starts the rotation of the transport rollers 25 to 28 (step S51 ). In step S51, the card transport control unit 40 rotates the transport rollers 25 to 28 in the direction (hereinafter referred to as the opposite direction) to transport the card 21 from the storage unit to the insertion port 22, and the card 21 is transported to the insertion port at a constant speed. twenty two. At this time, the magnetic field control unit 9 also controls the magnetic field generating unit 8 so that the interfering magnetic field is radiated from the loop antenna 35 . The control unit 2 judges whether or not the sensor 30 disposed adjacent to the transport roller 25 has detected the rear end of the card 21 (step S52 ).

Then, when the control unit 2 determines that the sensor 30 disposed adjacent to the transport roller 25 has detected the rear end of the card 21 (step S52: Yes), the card transport control unit 40 causes the transport rollers 25-28 rotating in the opposite direction The rotation of is stopped (step S53). On the other hand, when it is determined that the sensor 30 arranged adjacent to the conveyance roller 25 has not detected the rear end of the card 21 (step S52 : No), the standby is performed directly. In addition, here, since the front end and the rear end of the card 21 are described based on the conveying direction of the card 21, the rear end of the card 21 during the above-mentioned taking-in operation and reading operation of the card 21 becomes the card 21 when the card is returned. Front end.

The control unit 2 determines whether the sensor 30 has changed from the state in which the card 21 has been detected to the state in which the card 21 has not been detected (step S53). That is, when the sensor 30 detects the rear end of the card 21 (step S53: YES), the card conveyance control part 40 stops the conveyance rollers 25-28, and stops conveyance of the card 21 (step S54). On the other hand, when the control part 2 judges that the sensor 30 has not detected the rear end of the card 21 (step S53: No), it just waits. During these processes, the card 21 is held by the conveyance rollers 25 , and its front end protrudes outward from the insertion port 22 . Therefore, the user can grasp and pull out the front end portion of the card 21 protruding from the insertion opening 22 .

The control unit 2 determines whether the insertion detection sensor 23 has changed from the state of detecting the card 21 to the state of not detecting the card 21 (step S55). 21, that is, when the card 21 has been pulled out (step S55: Yes), the control unit 2 ends the process. On the other hand, when the control part 2 judges that the card 21 has not been pulled out (step S55: No), it just waits. When the processing of this step S55 ends, all the processing shown in FIG. 5 ends.

In the above-described embodiment, the magnetic field generated by the loop antenna 35 is changed by increasing the value of the current flowing to the loop antenna 35. However, when the foreign object detection unit 10 detects a foreign object, the magnetic field control unit 9 may The frequency of the generated drive current is varied.

FIG. 7 is a diagram showing how the magnetic field control unit 9 changes the frequency when the foreign object detection unit 10 detects a foreign object. As shown in FIG. 7 , when the foreign object detection unit 10 detects a foreign object, the magnetic field control unit 9 sets the value of the frequency of the drive current to the loop antenna 35 from F2 to F1 which is lower than F2. By setting the value of the frequency of the driving current from F2 to F1 lower than F2 in this way, the frequency of the magnetic field generated from the loop antenna 35 is lowered. Therefore, when the foreign object placed in front of the insertion port 22 is a magnetic body, the power lost due to iron loss becomes small, and it is possible to prevent the illegal magnetic reader device installed in front of the insertion port 22 from scanning the magnetic reader device 1. Reading and other illegal acts.

In addition, in the above-mentioned embodiment, the foreign object detection sensor 36 is provided, but this may be changed to provide the ammeter 12 for measuring the current value of the loop antenna 35 . FIG. 8 is a block diagram showing the configuration of a main part of the magnetic reader 1 provided with the ammeter 12 . By measuring the current value flowing through the loop antenna 35 with the ammeter 12 , it is possible to detect that a foreign object with high magnetic permeability such as an iron plate or ferrite is attached to the front of the loop antenna 35 . When a foreign object with high magnetic permeability is attached, the inductance of the loop antenna 35 changes. As a result, the current value changes compared to the case where a foreign object having a high magnetic permeability is attached. At this time, the magnetic field control unit 9 determines whether the measured current value is within a predetermined range, and if it is determined that the measured current value is not within the predetermined range, the magnetic field control unit 9 determines that a foreign object is attached. , the magnetic field generated by the loop antenna 35 can be increased by increasing the drive current.

Furthermore, in the above-described embodiment, the iron core 34 is used to prevent the magnetic head 29 from being hindered in reading the magnetic information of the card 21 , but the iron core 34 may not be provided. If the iron core 34 as shown in FIG. 2( a ) is not provided, it is impossible to physically prevent the magnetic field from the loop antenna 35 from being radiated to the magnetic head 29 side. However, by changing the magnetic field generated by the magnetic field control unit 9 when the card 21 is taken in and read, the influence of the magnetic field radiated from the loop antenna 35 on the magnetic head 29 when the card 21 is read can be prevented.

FIG. 9 is a flowchart of the processing procedure of the card 21 taking in operation and reading operation when the iron core 34 is not provided. Hereinafter, description will be made along this flowchart, but the magnetic reader 1 is in a state where the card 21 has not been detected by the insertion detection sensor 23 and the sensors 30 to 33 . Furthermore, the magnetic field generator 8 radiates a magnetic field from the loop antenna 35 so that a drive current flows through the loop antenna 35 .

As shown in FIG. 9 , the control unit 2 determines whether the insertion detection sensor 23 has detected the card 21 (step S91 ). Then, when the control unit 2 determines that the insertion detection sensor 23 has detected the card 21 (step S91: Yes), it is determined that the card 21 has been inserted, and the card transport control unit 40 starts rotating the transport rollers 25 to 28 in the positive direction. mode control (step S92). Afterwards, the card transport control unit 40 transports the card 21 to the storage unit at a constant speed, and when the card transport control unit 40 transports the card 21 to the storage unit, it passes over the sensors 30 to 33 .

The control unit 2 judges whether the sensor 31 provided on the insertion port 22 side relative to the magnetic head 29 has detected the card 21 (step S93 ), and if it is determined that the sensor 31 provided on the insertion port 22 side relative to the magnetic head 29 has detected the card 21 (Step S93: Yes), the drive signal to the loop antenna 35 is stopped, and the generation of the magnetic field is stopped (Step S94). Since the distance between the sensor 31 and the insertion port 22 is longer than that of the card 21, even if the generation of the magnetic field is stopped, the illegal magnetic reading device arranged before the insertion port 22 will not read the magnetic information. On the other hand, when it is determined that the sensor 31 provided on the side of the insertion port 22 rather than the magnetic head 29 has detected the card 21 (step S93 : NO), the standby mode is directly performed.

Thereafter, the magnetic head 29 comes into contact with the magnetic stripe of the card 21, and the magnetic information reading unit 3 reads the magnetic data recorded on the card 21 (step S95). The control unit 2 judges whether the sensor 33 arranged adjacent to the transport roller 28 has detected the card 21 (step S96), and if it is judged that the sensor 33 has detected the card 21 (step S96: Yes), it is judged that the card 21 has reached the rear end. , the card transport control unit 40 stops the rotation of the transport roller (step S97 ). Thereafter, the magnetic field generating unit 8 applies a driving signal to the loop antenna 35 according to an instruction from the control unit 2 , and the loop antenna 35 generates a magnetic field again (step S98 ). Regarding the returning operation of the card, since the same processing as that of the flowchart shown in FIG. 5 is performed, description thereof is omitted here.

(b) of FIG. 10 is a time chart of the magnetic field generated by the magnetic field generating unit when the process of the flowchart shown in FIG. 9 is performed. As shown in (b) of FIG. 10 , when the sensor 31 detects the card 21, the magnetic field control unit 9 stops the magnetic field generated from the loop antenna 35, and then when the sensor 33 detects the rear end of the card 21, the magnetic field The control unit 9 causes the loop antenna 35 to generate a magnetic field again. In this way, even if the iron core 34 is not provided, only during the period when the magnetic head 29 reads the magnetic data of the card 21 (the period when the card 21 is detected by the sensor 31 and the sensor 33), the noise generated from the loop antenna 35 can be stopped. Therefore, illegal activities such as skimming of the magnetic reading device 1 by an illegal magnetic reading device when inserting the card 21 or ejecting the card 21 can be hindered.

In this way, the foreign object detection unit 10 detects whether there is an illegal magnetic reading device near the insertion port 22 where the card 21 is inserted or ejected, and generates a magnetic field near the insertion port 22 to hinder the magnetic field emitted from the illegal magnetic reading device. The magnetic field generation part 8 and the magnetic field control part 9 of the obstructing magnetic field judge whether the foreign object detection part 10 has detected an illegal magnetic reading device, and when it is judged that the foreign object detection part 10 has detected an illegal magnetic reading device, the magnetic field generation part 8, the intensity displacement of the magnetic field is hindered, so even if an illegal magnetic reading device is installed in a manner to block the magnetic field, the magnetic data recorded on the magnetic recording medium will not be stolen by the illegal magnetic reading device.

For example, even if an illegal magnetic reading device that uses a magnetic plate to block a magnetic field is installed around the magnetic reading device, the foreign object detection unit 10 detects the illegal magnetic reading device, and the magnetic field generated from the magnetic field generating unit 8 increase and thus also be able to hinder illegal magnetic reading devices. Moreover, the magnetic field is largely displaced at the timing when the foreign object detection unit 10 detects an illegal magnetic reading device, so that the magnetic data of the card 21 will not be illegally detected during the period from inserting the card 21 to detecting the insertion of the card 21. Magnetic reading device theft.

Furthermore, as shown in (c) of FIG. 2 , a plurality of magnetic field generators 8 are provided, and when a foreign object such as an illegal magnetic reading device is detected by the foreign object detector 10, a magnetic field is generated from each of the plurality of magnetic field generators. In the case where an illegal magnetic reading device as described above is installed, the foreign matter detection unit 10 detects an illegal magnetic reading device, and a magnetic field is generated from a plurality of magnetic field generating parts 8, thereby also being able to increase the generated magnetic field and hinder illegal operations. Magnetic reading device.

Moreover, the magnetic field control unit 9 shifts the frequency of the magnetic field generated when a foreign object is detected by the foreign object detection unit 10. Therefore, when an illegal magnetic reading device as described above is installed, the frequency can be shifted so that the magnetic field due to iron loss Lost energy is reduced, hindering illegal magnetic reading devices.

And, since the frequency of the magnetic field generated from a plurality of magnetic field generating parts 8 is set to be different, for example, when an illegal magnetic reading device that uses a magnetic plate to block the magnetic field is installed, the magnetic field with a lower frequency is due to iron loss. The loss of energy is reduced, hindering illegal magnetic reading devices.

In addition, since the magnetic field generating unit 8 generates a magnetic field only when the foreign object detection unit 10 detects a foreign object, the theft of the magnetic information recorded on the card 21 can be prevented when an illegal magnetic reading device is installed. In addition, when no illegal magnetic reading device is provided, since no magnetic field is generated, wasteful power consumption is not avoided.

In the above-mentioned embodiment, the foreign object detection unit 10 detects the illegal magnetic reading device, and the magnetic field control unit 9 controls the magnitude of the magnetic field generated by the magnetic field generation unit 8. In the other case, the magnetic field control unit 9 displaces the magnetic field generated by the magnetic field generating unit so as to increase. In this case, it is possible to prevent the magnetic information of the card 21 from being stolen by an illegal magnetic reader when the user brings the card 21 close to the magnetic reader 1 (before inserting the magnetic reader 1 ).

In addition, the present invention is not limited to the above-mentioned embodiment itself, and the constituent elements can be modified and realized in the range not departing from the spirit at the stage of implementation. Furthermore, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the above-mentioned embodiments. For example, some of all the constituent elements shown in the embodiment may be deleted. In addition, components in different embodiments may be appropriately combined.

Claims (6)

1. A magnetic reading device, characterized in that, possesses: The magnetic information reading unit reads the magnetic data stored in the card inserted into the main body; a card conveying section conveying the card inserted into the above-mentioned main body; and A card insertion port unit is provided on the front portion of the above-mentioned main body, A loop antenna surrounding an insertion opening formed on a front surface of the main body is provided in the card insertion opening unit. 2. The magnetic reading device according to claim 1, wherein: A member for changing the characteristics of the magnetic field radiated from the loop antenna is provided in the card insertion slot unit. 3. The magnetic reading device of claim 2, wherein: A member provided in the card insertion slot unit absorbs a magnetic field radiated from the loop antenna toward the inside of the magnetic reader. 4. The magnetic reading device according to claim 2 or 3, characterized in that, A member provided in the card slot unit increases the magnetic field radiated from the loop antenna toward the front side of the slot. 5. The magnetic reading device of claim 4, wherein: The components provided in the above-mentioned card insertion slot unit are materials with high magnetic permeability. 6. The magnetic reading device of claim 4, wherein: The member provided in the card insertion slot unit has a shape that surrounds the insertion slot and covers the magnetic information reading unit side of the loop antenna.

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