WO2013030877A1 - 磁気記録媒体読取装置 - Google Patents
磁気記録媒体読取装置 Download PDFInfo
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- WO2013030877A1 WO2013030877A1 PCT/JP2011/004827 JP2011004827W WO2013030877A1 WO 2013030877 A1 WO2013030877 A1 WO 2013030877A1 JP 2011004827 W JP2011004827 W JP 2011004827W WO 2013030877 A1 WO2013030877 A1 WO 2013030877A1
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- Prior art keywords
- recording medium
- magnetic field
- magnetic recording
- frequency
- card
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07F—COIN-FREED OR LIKE APPARATUS
- G07F19/00—Complete banking systems; Coded card-freed arrangements adapted for dispensing or receiving monies or the like and posting such transactions to existing accounts, e.g. automatic teller machines
- G07F19/20—Automatic teller machines [ATMs]
- G07F19/205—Housing aspects of ATMs
- G07F19/2055—Anti-skimming aspects at ATMs
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/08—Methods or arrangements for sensing record carriers, e.g. for reading patterns by means detecting the change of an electrostatic or magnetic field, e.g. by detecting change of capacitance between electrodes
- G06K7/082—Methods or arrangements for sensing record carriers, e.g. for reading patterns by means detecting the change of an electrostatic or magnetic field, e.g. by detecting change of capacitance between electrodes using inductive or magnetic sensors
- G06K7/083—Methods or arrangements for sensing record carriers, e.g. for reading patterns by means detecting the change of an electrostatic or magnetic field, e.g. by detecting change of capacitance between electrodes using inductive or magnetic sensors inductive
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07F—COIN-FREED OR LIKE APPARATUS
- G07F7/00—Mechanisms actuated by objects other than coins to free or to actuate vending, hiring, coin or paper currency dispensing or refunding apparatus
- G07F7/08—Mechanisms actuated by objects other than coins to free or to actuate vending, hiring, coin or paper currency dispensing or refunding apparatus by coded identity card or credit card or other personal identification means
- G07F7/0873—Details of the card reader
Definitions
- the present invention relates to an apparatus for reading data recorded on a magnetic recording medium, and more particularly to a magnetic recording medium reading apparatus having a function of preventing unauthorized acquisition of data.
- Transaction processing devices such as ATM (Automated Teller Machine) and CD (Cash Dispenser) are equipped with a card reader that reads magnetic cards.
- ATM Automated Teller Machine
- CD Credit Dispenser
- a card reader that reads magnetic cards.
- skimming that illegally obtains data recorded on the magnetic stripe of the card has occurred.
- an illegal reading device (hereinafter referred to as “Skimmer”) equipped with a magnetic head is installed near the card insertion slot of a card reader provided in an ATM or CD.
- Patent Document 1 listed below describes a card reader in which a disturbing magnetic field generator is provided in the vicinity of a card insertion slot.
- a disturbing magnetic field generator generates a disturbing magnetic field in the outer region of the card insertion slot. For this reason, even if a skimmer is attached to the outside of the card insertion slot, the data read by the skimmer's magnetic head is different from the original data recorded on the card due to the influence of the disturbing magnetic field. Thereby, it is possible to prevent the card data from being illegally acquired.
- Patent Document 2 described later describes a card reader in which a loop antenna for generating a disturbing magnetic field is provided around a card insertion slot.
- the antenna surface of the loop antenna is parallel to the front surface of the card insertion slot. Also in this card reader, since a disturbing magnetic field is generated in the outer area of the card insertion slot, even if a skimmer is attached outside the card insertion slot, it is possible to prevent the card data from being illegally acquired. .
- a sensor for detecting a metal body constituting the skimmer is required.
- a metal body detection sensor is provided separately from the disturbing magnetic field generator.
- a dedicated sensor is required, which increases the number of parts and increases the cost, and there is a problem that it becomes an obstacle to downsizing of the apparatus.
- an object of the present invention is to provide a magnetic recording medium reading device capable of detecting a metal body without providing a dedicated sensor.
- a magnetic recording medium reading device is provided with an insertion slot into which a magnetic recording medium is inserted, and an interference provided in the vicinity of the insertion slot for preventing unauthorized reading of data recorded on the magnetic recording medium.
- a magnetic field generation unit that generates a magnetic field and a control unit that controls the magnetic field generation unit are provided. The control unit detects a change in the disturbing magnetic field generated by the magnetic field generation unit, and detects a metal body installed near the insertion port based on the detection result.
- the magnetic field generator may include an oscillation circuit including a loop antenna that generates a disturbing magnetic field.
- the oscillation frequency of the oscillation circuit is the first frequency
- the control means outputs a control signal having a second frequency lower than the first frequency to the magnetic field generation unit.
- An oscillation operation may be performed based on the signal.
- the control signal may be a rectangular wave signal.
- the frequency of the rectangular wave signal may change depending on the time zone. Further, the frequency of the rectangular wave signal may be changed randomly.
- the frequency region of the disturbing magnetic field is preferably 100 Hz to 20 KHz.
- switching means for switching the oscillation frequency of the oscillation circuit may be provided.
- the switching unit may switch the oscillation frequency when the control unit detects that the disturbing magnetic field starts to change.
- the switching means may switch the oscillation frequency at regular time intervals.
- control means determines whether or not the changed state of the disturbing magnetic field has continued for a predetermined time, and determines that the metal body has been installed when the state has continued for a predetermined time, and the installation of the metal body May be notified to the host device.
- adjustment means for making the amplitude of the output of the oscillation circuit constant may be provided.
- the present invention it is possible to detect a skimmer using the disturbing magnetic field while preventing the data on the magnetic recording medium from being read by the skimmer due to the disturbing magnetic field. For this reason, a dedicated sensor is not required, and the cost can be reduced and the size can be reduced.
- FIG. 1 is a block diagram showing an electrical configuration of a card reader according to an embodiment of the present invention.
- FIG. 2 is a side sectional view and a front view of the card reader.
- FIG. 3 is a front view showing another example of the loop antenna.
- FIG. 4 is a plan view of the magnetic card.
- FIG. 5 is a block diagram illustrating specific configurations of the magnetic field generation unit and the magnetic field control unit.
- FIG. 6 is a view showing a state in which a skimmer is installed near the insertion opening.
- FIG. 7 is a waveform diagram for explaining the principle of detecting a metal body.
- FIG. 8 shows the frequency spectrum of the disturbing magnetic field.
- FIG. 9 is a diagram showing another example of the frequency spectrum of the disturbing magnetic field.
- FIG. 1 is a block diagram showing an electrical configuration of a card reader according to an embodiment of the present invention.
- FIG. 2 is a side sectional view and a front view of the card reader.
- FIG. 3 is
- FIG. 10 is a block diagram showing another embodiment.
- FIG. 11 is a waveform diagram of the oscillation output and the filter output when there is no metal body.
- FIG. 12 is a waveform diagram of oscillation output and filter output when a metal body is present.
- FIG. 13 is a waveform diagram for explaining frequency switching.
- FIG. 14 is a waveform diagram for explaining another example of frequency switching.
- FIG. 15 is a waveform diagram in the case where the oscillation output changes due to a metal body other than the skimmer.
- FIG. 16 is a waveform diagram when the oscillation output changes due to the skimmer.
- FIG. 17 is a side cross-sectional view and a front view when a core is disposed on a loop antenna.
- the card reader 1 includes a CPU 2 that controls the operation of the entire apparatus, a magnetic information reading unit 3 that reads magnetic data recorded on the magnetic card, and a card that carries the magnetic card.
- a transport unit 4 a card detection sensor 5 that detects a magnetic card, a memory 6 that stores magnetic data read by the magnetic information reading unit 3, and a host interface 7 that is a connection unit with a host device 200 (for example, ATM)
- a magnetic stripe detector 10 for detecting the magnetic stripe of the magnetic card
- a magnetic field generator 8 for generating a disturbing magnetic field for preventing reading of data recorded on the magnetic stripe.
- the CPU 2 includes a magnetic field control unit 9 that controls the magnetic field generation unit 8 and a card transport control unit 12 that controls the card transport unit 4.
- the magnetic stripe detection unit 10 and the magnetic field generation unit 8 are installed in the card insertion slot unit 24.
- the magnetic stripe detection unit 10 includes a magnetic head 34 (FIG. 2) described later. Details of the magnetic field generator 8 and the magnetic field controller 9 will be described later.
- a card insertion slot unit 24 is provided on the front surface of the casing 100 of the card reader 1.
- the card insertion slot unit 24 is formed with an insertion slot 22 into which a magnetic card (hereinafter simply referred to as “card”) 21 is inserted.
- the card 21 has a magnetic stripe 21a.
- FIG. 4 is a view of the card 21 as viewed from the back side.
- a card insertion detection sensor 23 for detecting the inserted card 21 is provided near the insertion slot 22.
- the card insertion detection sensor 23 is composed of, for example, a micro switch, and is disposed at a position pressed by the card 21 inserted from the insertion port 22.
- a magnetic head 34 for detecting a magnetic stripe is provided near the insertion slot 22. The magnetic head 34 detects the magnetic stripe 21 a of the card 21.
- transport rollers 25 to 28, card position detection sensors 30 to 33, and a magnetic head 29 are provided inside the casing 100 of the card reader 1.
- a pair of transport rollers 25 to 28 is provided across the transport path P, and the card 21 is sandwiched and transported by the pair of rollers.
- These transport rollers 25 to 28 are connected to a motor (not shown) via a transport belt (not shown).
- a motor not shown
- a transport belt not shown
- the pair of transport rollers one is a driving roller to which the rotational force of the motor is transmitted, and the other is a driven roller that rotates following the driving roller.
- the conveyance rollers 25 to 28, together with the above-described conveyance belt and motor, constitute the card conveyance unit 4 (FIG. 1).
- the card position detection sensors 30 to 33 are transmissive optical sensors, each having a light emitting part and a light receiving part that are opposed to each other with the conveyance path P interposed therebetween.
- the arrangement interval of these sensors 30 to 33 is shorter than the length of the magnetic card 21 in the transport direction.
- the sensor 30 detects that the card 21 is sandwiched between the transport rollers 25 closest to the insertion port 22.
- the sensor 33 detects that the inserted card 21 has reached a storage part (not shown) that temporarily stores the card.
- the sensors 31 and 32 detect the position of the card 21 being conveyed.
- These card position detection sensors 30 to 33 together with the card insertion detection sensor 23 constitute a card detection sensor 5 (FIG. 1).
- the magnetic head 29 is provided below the conveyance path P between the conveyance roller 26 and the conveyance roller 27.
- the magnetic head 29 reads data recorded on the magnetic stripe 21 a of the card 21 in the process in which the inserted card 21 is transported along the transport path P.
- the magnetic head 34 is a magnetic head for detecting the presence / absence of data recorded on the magnetic stripe
- the magnetic head 29 is a magnetic head for reproducing the data itself recorded on the magnetic stripe. Head.
- the distance between the magnetic head 29 and the sensor 33 is slightly longer than the length of the card 21 in the transport direction. Therefore, when the card 21 reaches the storage unit, that is, when the tip of the card 21 reaches the position of the sensor 33, the magnetic head 29 has completed reading of data recorded on the card 21. .
- a loop antenna 35 is provided in the vicinity of the front face of the card insertion slot unit 24. As can be seen from FIG. 2A, the loop antenna 35 is provided near the insertion slot 22 in the insertion slot 22 side of the magnetic head 34 for detecting the magnetic stripe in the insertion direction A of the card 21. .
- the loop antenna 35 is an antenna in which a conductor is wound once or a plurality of times in a loop shape, and is arranged so as to surround the insertion opening 22 as shown in FIG.
- the loop antenna 35 When a driving current flows through the loop antenna 35, the loop antenna 35 generates a magnetic field in the vicinity of the insertion port 22.
- the loop antenna 35 constantly generates a magnetic field by continuously supplying a drive current to the loop antenna 35.
- This magnetic field acts as a disturbing magnetic field in front of the insertion slot 22 and prevents the skimmer 300 from reading magnetic information when the skimmer 300 is attached in front of the insertion slot 22 as shown in FIG.
- the magnetic field also acts as a disturbing magnetic field on the magnetic stripe detection magnetic head 34 behind the insertion slot 22, thereby preventing unauthorized reading of magnetic information in the magnetic head 34.
- loop antenna 35 instead of the loop antenna 35 shown in FIG. 2B, two independent loop antennas 35a and 35b may be arranged on both sides of the insertion slot 22 as shown in FIG. Alternatively, as shown in FIG. 3B, one loop antenna 35c may be disposed only in the vicinity of the magnetic head 34 for detecting the magnetic stripe (FIG. 2A).
- FIG. 5 shows a specific configuration of the magnetic field generator 8 and the magnetic field controller 9.
- the magnetic field generator 8 includes an oscillation circuit 81, a mixer 82, and a power source 83.
- the oscillation circuit 81 includes a known LC oscillation circuit including the loop antenna 35 and a capacitor (not shown).
- the mixer 82 includes a switching circuit including switching elements such as relays and transistors.
- the power supply 83 supplies a DC voltage to the oscillation circuit 81 via the mixer 82.
- the magnetic field control unit 9 includes a controller 91, a filter circuit 92, an A / D converter 93, an adjustment circuit 94, and a power source 95, and constitutes “control means” in the present invention.
- An output voltage of the oscillation circuit 81 (hereinafter referred to as “oscillation output”) is input to the filter circuit 92.
- This oscillation output represents the intensity of the disturbing magnetic field.
- the filter circuit 92 smoothes the oscillation output.
- the A / D converter 93 samples the output voltage of the filter circuit 92 (hereinafter referred to as “filter output”) and converts it into a digital value.
- the output of the A / D converter 93 is input to the controller 91.
- the power supply 95 supplies a DC voltage to the controller 91.
- the controller 91 performs feedback control based on the intensity of the disturbing magnetic field obtained from the output of the A / D converter 93, and gives a command signal for making the output amplitude of the oscillation circuit 81 constant to the adjustment circuit 94.
- the adjustment circuit 94 receives this command signal and adjusts the voltage of the power supply 83.
- the controller 91 and the adjustment circuit 94 constitute an “adjustment unit” in the present invention.
- the controller 91 gives a rectangular wave signal as shown in FIG. 7C to the mixer 82 as a control signal.
- the switching elements constituting the mixer 82 perform ON / OFF operations in synchronization with the rectangular wave signal. While the switching element is ON, the capacitor of the oscillation circuit 81 is charged by the power supply 83. When the switching element is turned off, the charge of the capacitor is discharged through the coil (loop antenna 35), and the oscillation circuit 81 oscillates. That is, the oscillation operation of the oscillation circuit 81 is controlled by the rectangular wave signal. As a result, the oscillation circuit 81 generates an oscillation output modulated by the rectangular wave signal as shown in FIG. The oscillation output is smoothed by the filter circuit 92, and a filter output (DC voltage) as shown in FIG.
- the disturbing magnetic field always acts on the magnetic head 34 for detecting the magnetic stripe behind the loop antenna 35. For this reason, it becomes impossible to illegally acquire data from the magnetic head 34 via the lead wire. Even if the disturbing magnetic field always acts on the magnetic head 34, the magnetic head 34 does not need to reproduce the magnetic data itself. For example, the fact that the detection signal pattern is different before and after the detection of the magnetic stripe 21a is used. Thus, the magnetic stripe 21a can be detected.
- the disturbing magnetic field generated from the loop antenna 35 is also used for detecting the skimmer 300.
- the amplitude of the oscillation output of the oscillation circuit 81 differs depending on whether or not there is a metal body in the vicinity of the loop antenna 35. That is, when there is no metal body in the vicinity of the loop antenna 35, the amplitude of the oscillation output is large, and when there is a metal body, the amplitude of the oscillation output is small. Accordingly, as shown in FIG. 7B, the output of the filter circuit 92 is also large when there is no metal body and is small when there is a metal body.
- the skimmer 300 has a metal body as a component, and when the shield for shielding the disturbing magnetic field is attached to the skimmer 300, the shield is made of a metal body. Accordingly, when the skimmer 300 is installed, the amplitude of the oscillation output becomes small. Therefore, the skimmer 300 can be detected by detecting the change in the amplitude. Specifically, for example, a threshold is set for the filter output of FIG. 7B, and the controller 91 determines that the skimmer 300 is installed when the filter output is equal to or less than the threshold.
- the controller 91 When it is determined that the skimmer 300 has been installed, the controller 91 notifies the host device 200 of the installation via the host interface 7 (FIG. 1). In response to this notification, the host device 200 performs processing such as outputting an alarm.
- the change in the amplitude of the disturbing magnetic field generated by the loop antenna 35 is detected, and the skimmer 300 is detected based on the detection result. For this reason, the skimmer 300 can be detected while preventing the data of the card 21 from being illegally acquired by skimming by one loop antenna 35. This eliminates the need for a dedicated sensor for skimmer detection, and enables cost reduction and miniaturization.
- the controller 91 outputs a rectangular wave signal for controlling the oscillation operation of the oscillation circuit 81, and the same controller 91 detects a change in oscillation output. For this reason, the controller 91 can always correctly grasp the level of the filter output with reference to the rectangular wave signal, and the detection accuracy of the skimmer 300 is improved.
- the adjustment circuit 94 is provided so that the amplitude of the output of the oscillation circuit 81 is kept constant, the skimmer 300 can be detected stably and accurately.
- the change in the amplitude of the disturbing magnetic field is detected, but depending on the material of the metal body, the frequency of the disturbing magnetic field differs depending on whether the metal body is near the loop antenna 35 or not.
- the skimmer 300 may be detected based on a change in the frequency of the disturbing magnetic field. Further, the skimmer 300 may be detected based on both the change in amplitude and the change in frequency.
- the oscillation output of the oscillation circuit 81 in other words, the intensity of the disturbing magnetic field is a signal modulated by the rectangular wave signal as described above, and therefore, as shown in FIG. With a peak against.
- the probability that the frequency of the signal output from the magnetic head of the skimmer 300 overlaps with the frequency of the disturbing magnetic field is increased, so that skimming can be effectively prevented. it can.
- the oscillation frequency of the oscillation circuit 81 is f1 (first frequency) and the frequency of the rectangular wave signal output from the controller 91 is f2 (second frequency), f1> f2.
- the frequency f2 of the rectangular wave signal is constant, and the intervals between the frequencies at which the magnetic field intensity peaks (hereinafter referred to as “peak frequency”) are evenly f2.
- the frequency of the rectangular wave signal may be changed randomly.
- the peak frequency also changes randomly. In this way, it is impossible to determine which peak frequency of the disturbing magnetic field is generated as viewed from the skimmer 300, and thus it is impossible to cut the frequency of the disturbing magnetic field by filtering.
- the frequency of the rectangular wave signal may be changed regularly according to a pattern that cannot be discriminated by the skimmer 300.
- the frequency of the read signal (output of the magnetic head) of the card 21 is generally in the range of 100 Hz to 20 KHz
- the frequency region of the disturbing magnetic field is set to 100 Hz to 20 KHz according to the above range. It is preferable to have as many peak frequencies as possible in the frequency domain. As a result, the output of the skimmer 300 can be obstructed by the interfering magnetic field no matter what speed the card 21 is inserted.
- FIG. 10 shows another embodiment of the present invention.
- the overall configuration of the card reader is the same as that shown in FIGS.
- a frequency switching unit 84 is provided in the magnetic field generation unit 8.
- the frequency switching unit 84 constitutes “switching means” in the present invention. Since other configurations are the same as those in FIG. 5, description of portions overlapping those in FIG. 5 is omitted.
- the frequency switching unit 84 switches the oscillation frequency of the oscillation circuit 81 based on a command signal from the controller 91.
- FIG. 11 shows the state of this switching.
- FIG. 11A shows the oscillation output of the oscillation circuit 81
- FIG. 11B shows the filter output of the filter circuit 92.
- the frequency of the oscillation output is switched from a low frequency to a high frequency at time t.
- the waveform of the oscillation output is a waveform when there is no metal body in the vicinity of the loop antenna 35.
- a represents the amplitude of the oscillation output after the frequency is switched.
- the waveform of the oscillation output is as shown in FIG. That is, assuming that a metal body is detected at time t, the amplitude b of the oscillation output is smaller than the amplitude a when no metal body exists. Accordingly, the filter output after time t in FIG. 12B is also smaller than the filter output after time t in FIG. 11B. Therefore, the skimmer 300 can be detected by setting a threshold value for the filter output after the frequency is switched.
- the higher the frequency of the disturbing magnetic field the larger the detectable region of the metal body and the better the detection accuracy.
- the frequency of the disturbing magnetic field should be low in accordance with the insertion speed of the card 21. Therefore, by switching the frequency of the disturbing magnetic field by the frequency switching unit 84 as described above, skimming can be effectively prevented by the low-frequency disturbing magnetic field, and the skimmer 300 can be accurately detected by the high-frequency disturbing magnetic field. Can do.
- the frequency switching unit 84 There are several methods for determining the timing at which the frequency of the disturbing magnetic field is switched by the frequency switching unit 84. For example, in the example shown in FIG. 13, when the controller 91 detects that the strength of the disturbing magnetic field (oscillation output) starts to decrease in the state where the frequency of the disturbing magnetic field is low, the frequency is switched from the controller 91. A command signal is output to the unit 84, and the frequency switching unit 84 switches the frequency of the disturbing magnetic field to a high frequency based on the command signal. When the skimmer 300 is detected, the frequency of the disturbing magnetic field is switched to a lower frequency again.
- the frequency of the disturbing magnetic field is automatically switched to a high frequency suitable for the metal body detection, so that the skimmer 300 can be quickly and easily operated. It can be detected reliably.
- the frequency of the disturbing magnetic field returns to a low frequency suitable for skimming prevention, so that illegal acquisition of data by the skimmer 300 can be prevented.
- the oscillation frequency may be switched at regular intervals so that a low-frequency disturbing magnetic field and a high-frequency disturbing magnetic field are alternately generated.
- the period ⁇ 1 in which the amplitude of the oscillation output is small is short as shown in FIG.
- the period ⁇ 2 in which the amplitude of the oscillation output is small extends for a long time.
- the controller 91 determines whether or not the state in which the amplitude of the oscillation output has decreased (the state in which the filter output has decreased), that is, the state in which the disturbing magnetic field has changed has continued for a predetermined time. In this case, it is possible to prevent erroneous detection by a ring or a wristwatch by determining that the skimmer 300 is installed.
- the controller 91 notifies the host device 200 of the installation via the host interface 7 (FIG. 1). In response to this notification, the host device 200 performs processing such as outputting an alarm.
- the skimming countermeasure when the card 21 is inserted has been described.
- the disturbing magnetic field is constantly generated from the loop antenna 35, the skimming is prevented even when the card 21 is returned. can do.
- the detection of the skimmer is taken as an example.
- the present invention can employ various embodiments in addition to the above-described embodiments.
- the loop antenna of FIG. 2 or FIG. 3 is taken as an example, but the loop antenna is not limited to these.
- three or more loop antennas may be provided. In this case, since a stronger disturbing magnetic field is generated, skimming can be more effectively prevented.
- the magnetic field has directivity or a stronger disturbing magnetic field is generated.
- a strong disturbing magnetic field is generated far away for the skimmer 300 mounted in front of the insertion port 22, and the magnetic data reading magnetic head 29 located behind the insertion port 22 is The influence of the disturbing magnetic field can be eliminated.
- a magnetic card having a magnetic stripe on the back surface is taken as an example of the magnetic recording medium.
- the present invention can also be applied to a magnetic recording medium reading apparatus that handles a magnetic card having magnetic stripes on the front surface or both surfaces.
- a magnetic card is taken as an example of the magnetic recording medium.
- the present invention can be applied not only to a magnetic card but also to an apparatus for reading a magnetic recording medium such as a passbook having a magnetic stripe.
- the present invention can be applied to all devices for reading a magnetic recording medium, such as a card reader or passbook reader installed in an automatic transaction processing apparatus such as ATM, or a card reader installed in a card authentication terminal.
Abstract
Description
8 磁界発生部
9 磁界制御部
21 磁気カード
22 挿入口
35 ループアンテナ
36 コア
81 発振回路
82 混合器
84 周波数切替部
91 コントローラ
92 フィルタ回路
93 A/D変換器
94 調整回路
200 上位装置
300 スキマー
Claims (12)
- 磁気記録媒体が挿入される挿入口と、
前記挿入口付近に設けられ、前記磁気記録媒体に記録されたデータが不正に読み取られるのを妨害するための妨害磁界を発生する磁界発生部と、
前記磁界発生部を制御する制御手段と、を備えた磁気記録媒体読取装置において、
前記制御手段は、前記磁界発生部が発生した妨害磁界の変化を検出し、当該検出結果に基づいて、前記挿入口付近に設置された金属体を検出することを特徴とする磁気記録媒体読取装置。 - 請求項1に記載の磁気記録媒体読取装置において、
前記磁界発生部は、前記妨害磁界を発生するループアンテナを含む発振回路を備えていることを特徴とする磁気記録媒体読取装置。 - 請求項2に記載の磁気記録媒体読取装置において、
前記発振回路の発振周波数は、第1の周波数であり、
前記制御手段は、前記第1の周波数よりも低い第2の周波数の制御信号を前記磁界発生部へ出力し、
前記発振回路は、前記制御信号に基づいて発振動作を行うことを特徴とする磁気記録媒体読取装置。 - 請求項3に記載の磁気記録媒体読取装置において、
前記制御信号が矩形波信号であることを特徴とする磁気記録媒体読取装置。 - 請求項4に記載の磁気記録媒体読取装置において、
前記矩形波信号の周波数が時間帯によって変化することを特徴とする磁気記録媒体読取装置。 - 請求項4に記載の磁気記録媒体読取装置において、
前記矩形波信号の周波数がランダムに変化することを特徴とする磁気記録媒体読取装置。 - 請求項1に記載の磁気記録媒体読取装置において、
前記妨害磁界の周波数領域が100Hz~20KHzであることを特徴とする磁気記録媒体読取装置。 - 請求項2に記載の磁気記録媒体読取装置において、
前記発振回路の発振周波数を切り替える切替手段を設けたことを特徴とする磁気記録媒体読取装置。 - 請求項8に記載の磁気記録媒体読取装置において、
前記切替手段は、前記妨害磁界が変化し始めたことを前記制御手段が検知した時点で、前記発振周波数を切り替えることを特徴とする磁気記録媒体読取装置。 - 請求項8に記載の磁気記録媒体読取装置において、
前記切替手段は、一定時間ごとに前記発振周波数を切り替えることを特徴とする磁気記録媒体読取装置。 - 請求項1に記載の磁気記録媒体読取装置において、
前記制御手段は、前記妨害磁界の変化した状態が所定時間継続したか否かを判定し、当該状態が所定時間継続した場合に、前記金属体が設置されたと判定するとともに、当該金属体の設置を上位装置へ通知することを特徴とする磁気記録媒体読取装置。 - 請求項2に記載の磁気記録媒体読取装置において、
前記発振回路の出力の振幅を一定にするための調整手段を設けたことを特徴とする磁気記録媒体読取装置。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201180072778.8A CN103733231B (zh) | 2011-08-30 | 2011-08-30 | 磁记录介质读取装置 |
JP2013530868A JP5658829B2 (ja) | 2011-08-30 | 2011-08-30 | 磁気記録媒体読取装置 |
PCT/JP2011/004827 WO2013030877A1 (ja) | 2011-08-30 | 2011-08-30 | 磁気記録媒体読取装置 |
EP11871691.9A EP2752825B1 (en) | 2011-08-30 | 2011-08-30 | Device for reading magnetic recording medium |
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Cited By (6)
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JP2015045934A (ja) * | 2013-08-27 | 2015-03-12 | Necプラットフォームズ株式会社 | 情報保護装置及び情報保護プログラムならびに情報保護方法 |
JP2015197687A (ja) * | 2014-03-31 | 2015-11-09 | 日本電産サンキョー株式会社 | 磁界発生装置、磁気記録媒体処理装置および磁気記録媒体処理装置の制御方法 |
WO2015170599A1 (ja) * | 2014-05-09 | 2015-11-12 | 沖電気工業株式会社 | 自動取引装置及び媒体処理装置 |
WO2016002568A1 (ja) * | 2014-07-01 | 2016-01-07 | 日本電産サンキョー株式会社 | 磁界発生装置、磁界発生装置の制御方法、および磁気記録媒体処理装置 |
CN105556604A (zh) * | 2013-09-18 | 2016-05-04 | 日本电产三协株式会社 | 磁存储介质处理装置以及磁存储介质处理装置的控制方法 |
JP2016206778A (ja) * | 2015-04-17 | 2016-12-08 | 日立オムロンターミナルソリューションズ株式会社 | フォトセンサ |
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JP6155164B2 (ja) * | 2013-10-24 | 2017-06-28 | 日本電産サンキョー株式会社 | カードリーダおよびカードリーダの制御方法 |
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JP2015045934A (ja) * | 2013-08-27 | 2015-03-12 | Necプラットフォームズ株式会社 | 情報保護装置及び情報保護プログラムならびに情報保護方法 |
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Also Published As
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EP2752825B1 (en) | 2017-03-22 |
EP2752825A4 (en) | 2015-05-06 |
JP5658829B2 (ja) | 2015-01-28 |
EP2752825A1 (en) | 2014-07-09 |
CN103733231B (zh) | 2016-03-23 |
CN103733231A (zh) | 2014-04-16 |
JPWO2013030877A1 (ja) | 2015-03-23 |
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