WO2015133567A1 - カードリーダ - Google Patents
カードリーダ Download PDFInfo
- Publication number
- WO2015133567A1 WO2015133567A1 PCT/JP2015/056482 JP2015056482W WO2015133567A1 WO 2015133567 A1 WO2015133567 A1 WO 2015133567A1 JP 2015056482 W JP2015056482 W JP 2015056482W WO 2015133567 A1 WO2015133567 A1 WO 2015133567A1
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- WO
- WIPO (PCT)
- Prior art keywords
- magnetic field
- face
- card
- end surface
- disturbing magnetic
- Prior art date
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Classifications
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- 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
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K13/00—Conveying record carriers from one station to another, e.g. from stack to punching mechanism
- G06K13/02—Conveying record carriers from one station to another, e.g. from stack to punching mechanism the record carrier having longitudinal dimension comparable with transverse dimension, e.g. punched card
- G06K13/08—Feeding or discharging cards
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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
- G06K7/087—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 flux-sensitive, e.g. magnetic, detectors
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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
Definitions
- the present invention relates to a card reader that reads magnetic data recorded on a card and records magnetic data on the card.
- skimming magnetic head a card reader that generates a disturbing magnetic field for preventing reading of magnetic data by a magnetic head for skimming (hereinafter referred to as “skimming magnetic head”) has been proposed (for example, see Patent Document 1). ).
- a differential skimming magnetic head in which a read head and a dummy head having substantially the same electrical characteristics are accommodated in one case body is known.
- the read head is a head for reading magnetic data by contacting the magnetic stripe of the card.
- the dummy head is disposed adjacent to the reading head in the width direction of the card and is disposed at a position where it does not contact the magnetic stripe.
- the card reader described in Patent Document 2 includes a disturbing magnetic field generation unit having two radiation sources that emit a disturbing magnetic field.
- the two radiation sources are arranged so as to sandwich the card conveyance path in the vertical direction, and the distance between one radiation source and the read head is different from the distance between one radiation source and the dummy head, The distance between the other radiation source and the read head is different from the distance between the other radiation source and the dummy head.
- an object of the present invention is to provide a card that can prevent skimming by a differential skimming magnetic head even when a differential skimming magnetic head having a narrow gap between a read head and a dummy head is used. To provide a reader.
- the card reader of the present invention is recorded on a card insertion slot into which a card having a magnetic stripe is inserted, a card passage through which a card inserted from the card insertion slot passes, and a magnetic stripe.
- Disturbing magnetic field generating means for generating a magnetic field for preventing unauthorized reading of magnetic data comprising: a core portion having at least one core formed of a magnetic material; A coil for generating a disturbing magnetic field to be rotated, and the insertion direction side of the card into the card insertion slot on one side in the card passage direction is the back side, and the card insertion slot on the other side in the card passage direction is from the card insertion slot.
- the core portion When the card discharge direction is the front side, the core portion includes a first end surface and a second end surface arranged so as to face substantially the front side, and the disturbing magnetic field generating means has a direction of the magnetic force lines at the first end.
- Direction that generates a disturbing magnetic field that fluctuates in a direction from the second end surface toward the second end surface and a direction from the second end surface toward the first end surface, and that exits from either the first end surface or the second end surface of the magnetic field lines of the disturbing magnetic field.
- the direction of entering the other of the first end face and the second end face is substantially parallel to the card passing direction, and the magnetic field lines of the disturbing magnetic field are the card passing direction and the card thickness direction. In the width direction of the card orthogonal to the crossing position where the magnetic stripe passes when the card is inserted.
- the disturbing magnetic field generating means includes a core portion having a first end surface and a second end surface arranged so as to face substantially the front side, and the direction of the magnetic lines of force is from the first end surface to the second end surface. And a disturbing magnetic field that varies in a direction from the second end face to the first end face is generated.
- the magnetic field lines of the disturbing magnetic field cross the position where the magnetic stripe passes when the card is inserted in the width direction of the card. Therefore, in the present invention, even if the distance between the read head and the dummy head of the differential type skimming magnetic head arranged at the position where the magnetic stripe passes is narrow, the disturbing magnetic field at the place where the read head is arranged is reduced.
- the magnetic lines of force cross the position where the magnetic stripe passes in the width direction of the card.
- the magnetic flux density of the disturbing magnetic field at the position where the skimming magnetic head is disposed is lowered, and the disturbing magnetic field is effectively prevented from being generated by the skimming magnetic head. It is difficult to influence.
- the present invention since the first end surface and the second end surface face substantially front side, it becomes possible to increase the magnetic flux density of the disturbing magnetic field at the position where the magnetic head for skimming is disposed, It is possible to effectively influence the disturbing magnetic field on the magnetic head for skimming.
- the first end face and the second end face are formed on a common core. If comprised in this way, it will become possible to suppress the leakage of the magnetic flux which the coil for disturbance magnetic field generation
- the core portion includes a third end surface and a fourth end surface that are disposed so as to face substantially the front side and are disposed at positions shifted from the first end surface and the second end surface in the width direction of the card.
- the magnetic field generating means generates a second disturbing magnetic field in which the direction of the magnetic field lines varies in a direction from the third end face toward the fourth end face and in a direction from the fourth end face toward the third end face, and the magnetic field lines of the second disturbing magnetic field are generated.
- the direction of exiting from one of the third end surface and the fourth end surface and the direction of entering the other of the third end surface and the fourth end surface are substantially parallel to the card passing direction,
- the first end face, the second end face, the third end face, and the fourth end face are preferably arranged so that the disturbing magnetic field and the second disturbing magnetic field overlap on the near side of the card insertion slot.
- the output signal of the read head is a signal in which a signal corresponding to the magnetic data, a signal corresponding to the disturbing magnetic field, and a signal corresponding to the second disturbing magnetic field are superimposed, and the output signal of the dummy head is changed to the disturbing magnetic field.
- a core part is provided with the 1st core in which a 1st end surface and a 2nd end surface are formed as a core, and the 2nd core in which a 3rd end surface and a 4th end surface are formed, 1st core And the second core are preferably arranged so as to sandwich the card passage in the thickness direction of the card. If comprised in this way, compared with the case where the 1st core and the 2nd core are arrange
- the first end face, the second end face, the third end face, and the fourth end face may be formed on a common core.
- leakage of magnetic flux generated by the disturbing magnetic field generating coil can be suppressed, and as a result, the disturbing magnetic field and the second disturbing magnetic field are effectively affected to the skimming magnetic head. It becomes possible.
- the configuration of the disturbing magnetic field generating means can be simplified.
- the direction of the lines of magnetic force periodically varies in a direction from the first end face to the second end face and in a direction from the second end face to the first end face.
- the direction of the lines of magnetic force periodically varies in a direction from the third end face toward the fourth end face and in a direction from the fourth end face toward the third end face.
- the card reader includes, for example, a card insertion portion formed with a card insertion slot and formed in a hollow shape, and the core portion and the disturbing magnetic field generating coil are disposed inside the card insertion portion. .
- the disturbing magnetic field generating means preferably includes a detection coil that is wound around the core and detects a change in the disturbing magnetic field.
- the disturbing magnetic field changes. Therefore, with this configuration, whether the skimming magnetic head is installed is determined based on the detection result of the detection coil. It becomes possible to detect. Also, with this configuration, since the detection coil is wound around the core around which the disturbing magnetic field generating coil is wound, the detection coil is added to the core around which the disturbing magnetic field generating coil is wound. Compared with the case where a wound core is provided separately, the card reader can be downsized. Further, with this configuration, it is not necessary to stop the disturbing magnetic field even when detecting whether or not the magnetic head for skimming is installed using the detection coil, so that skimming is effectively prevented. It becomes possible.
- the disturbing magnetic field generating means includes a detection coil that is wound around the core and detects a change in the disturbing magnetic field, and a second detection coil that is wound around the core and detects a change in the second disturbing magnetic field. It is preferable to provide.
- the disturbing magnetic field and the second disturbing magnetic field change. Therefore, when configured in this manner, based on the detection results of the detection coil and the second detection coil. It becomes possible to detect whether or not the skimming magnetic head is installed.
- the detection coil and the second detection coil are wound around the core around which the disturbing magnetic field generating coil is wound, so that the disturbing magnetic field generating coil is wound around the core.
- the card reader can be downsized as compared with the case where a core around which the detection coil is wound and a core around which the second detection coil is wound are separately provided. Further, with this configuration, it is not necessary to stop the disturbing magnetic field even when detecting whether or not the skimming magnetic head is installed using the detection coil and the second detection coil. It is possible to effectively prevent skimming.
- the direction of the magnetic lines of force periodically changes in the direction from the first end face to the second end face and in the direction from the second end face to the first end face.
- the direction periodically changes in the direction from the third end face to the fourth end face and in the direction from the fourth end face to the third end face, the fluctuation period of the direction of the magnetic field lines of the disturbing magnetic field, and the direction of the magnetic field lines of the second disturbing magnetic field
- the phase of the disturbing magnetic field and the phase of the second disturbing magnetic field are the same, or the phase of the disturbing magnetic field and the phase of the second disturbing magnetic field are reversed.
- the strength of the disturbing magnetic field is equal to the strength of the second disturbing magnetic field.
- the sine-wave-like difference signal which fluctuates by a fixed period as a difference signal which is a difference of the output signal of a detection coil, and the output signal of a 2nd detection coil. Even if the ambient temperature of the disturbing magnetic field generating means varies, the amplitude of the differential signal when the skimming magnetic head is not installed can be made constant and can be reduced. Therefore, it is possible to appropriately set the threshold value of the amplitude of the differential signal for determining whether or not the skimming magnetic head is installed. As a result, it is possible to accurately detect whether the skimming magnetic head is installed based on the amplitude of the difference signal.
- the card reader of the present invention prevents skimming by the differential skimming magnetic head even when the differential skimming magnetic head having a narrow gap between the read head and the dummy head is used. Is possible.
- FIG. 9A is a diagram for explaining an output signal of the detection coil shown in FIG. 8, and FIG. 9A is a diagram showing an output signal of the detection coil when a skimming magnetic head is not installed in front of the card reader;
- FIG. 5B is a diagram illustrating an output signal of a detection coil when a skimming magnetic head is installed in front of the card reader.
- FIG. 11 is a diagram for explaining a differential signal between the output signal of the detection coil and the output signal of the second detection coil shown in FIG.
- FIG. 7B is a diagram showing a differential signal when a skimming magnetic head is installed in front of the card reader. It is a schematic plan view for demonstrating the structure of the core part concerning other embodiment of this invention.
- FIG. 1 is a schematic side view for explaining a configuration of a front end side portion of a card reader 1 according to an embodiment of the present invention.
- FIG. 2 is a schematic plan view for explaining the configuration of the disturbing magnetic field generating means 10 shown in FIG.
- FIG. 3 is a diagram for explaining the strength and directionality of the disturbing magnetic field generated by the disturbing magnetic field generating means 10 shown in FIG.
- the card reader 1 of this embodiment is a device for reading magnetic data recorded on the card 2 and recording magnetic data on the card 2, and is used by being mounted on a predetermined host device such as an ATM.
- the card reader 1 includes a card insertion portion 4 in which a card insertion slot 3 into which a card 2 is inserted is formed, and a main body portion 5.
- a card passage 6 through which the card 2 inserted from the card insertion slot 3 passes is formed inside the card reader 1.
- the card reader 1 includes a magnetic head 7 that reads at least one of magnetic data recorded on the card 2 and records magnetic data on the card 2, and a driving roller 8 and a pad for conveying the card 2.
- a roller 9 and disturbing magnetic field generating means 10 for generating a magnetic field for preventing unauthorized reading of magnetic data recorded on the card 2 are provided.
- the card 2 passes in the X direction shown in FIG. Specifically, the card 2 is inserted in the X1 direction, and the card 2 is ejected in the X2 direction. That is, the X direction is the passing direction of the card 2, the X1 direction is the inserting direction of the card 2 into the card insertion slot 3 which is one of the passing directions of the card 2, and the X2 direction is the passing direction of the card 2. The card 2 is ejected from the card insertion slot 3 which is the other of the above. Further, the Z direction in FIG. 1 orthogonal to the X direction is the thickness direction of the card 2 taken into the card reader 1, and the Y direction in FIG. 1 orthogonal to the X direction and the Z direction is to the card reader 1.
- the X direction is referred to as “front-rear direction”
- the Y direction is referred to as “left-right direction”
- the Z direction is referred to as “up-down direction”.
- the X1 direction side is the “back (back)” side
- the X2 direction side is the “front” (front) side
- the Y1 direction side is the “right” side
- the Y2 direction side is the “left” side
- the Z1 direction side is “up”
- the “side” and the Z2 direction side are the “lower” side.
- Card 2 is, for example, a substantially rectangular vinyl chloride card having a thickness of about 0.7 to 0.8 mm.
- a magnetic stripe 2a for recording magnetic data is formed on the back surface of the card 2.
- the magnetic stripe 2a is formed along the longitudinal direction of the card 2 formed in a substantially rectangular shape.
- the card 2 is inserted into the card reader 1 and transported in the card reader 1 with the back surface thereof facing downward and the longitudinal direction of the card 2 substantially coinciding with the front-rear direction.
- the card 2 may incorporate an IC chip.
- the card 2 may be a PET (polyethylene terephthalate) card having a thickness of about 0.18 to 0.36 mm, or a paper card having a predetermined thickness.
- the card insertion part 4 is attached to the front end surface of the main body part 5. Moreover, the card insertion part 4 is formed in the hollow shape.
- the magnetic head 7, the drive roller 8, and the pad roller 9 are disposed inside the main body 5.
- the magnetic head 7 is disposed so as to face the card passage path (card transport path) 6 from below. Specifically, the magnetic head 7 is disposed so that the gap portion faces the card passage 6 from below.
- the magnetic head 7 is disposed at a position where the magnetic stripe 2a of the card 2 passes in the left-right direction.
- the drive roller 8 and the pad roller 9 are arranged so as to sandwich the card passage 6 in the vertical direction.
- a motor is connected to the drive roller 8 via a power transmission mechanism such as a belt or a pulley.
- the pad roller 9 is urged toward the driving roller 8.
- the card 2 is conveyed while being sandwiched between the drive roller 8 and the pad roller 9.
- the disturbing magnetic field generating means 10 includes a core 11 made of a magnetic material and an exciting coil 12 as a disturbing magnetic field generating coil wound around the core 11.
- the core portion 13 is constituted by one core 11.
- the core 11 and the coil 12 are disposed inside the card insertion portion 4 formed in a hollow shape. Further, the core 11 and the coil 12 are arranged on the upper side of the card passage 6. The core 11 and the coil 12 may be arranged below the card passage 6.
- the core 11 is formed in a substantially U shape.
- the one end surface 11a and the other end surface 11b of the core 11 are arranged so as to face substantially the front side.
- the one end surface 11a and the other end surface 11b are substantially parallel to a YZ plane composed of a left-right direction and a vertical direction.
- the one end surface 11a and the other end surface 11b are arrange
- the one end face 11a and the other end face 11b are arranged so as to sandwich the position where the magnetic stripe 2a passes in the left-right direction.
- the one end face 11a is arranged on the right side of the position where the magnetic stripe 2a passes in the left-right direction, and the other end face 11b is arranged on the left side of the position where the magnetic stripe 2a passes in the left-right direction.
- the one end surface 11a of this form is a 1st end surface
- the other end surface 11b is a 2nd end surface.
- one end surface 11a that is the first end surface and the other end surface 11b that is the second end surface are formed in one common core 11.
- the core 11 is arranged so that the position where the magnetic stripe 2a passes is closer to either the one end surface 11a or the other end surface 11b than either the one end surface 11a or the other end surface 11b in the left-right direction. It is preferable that In the present embodiment, the core 11 is arranged so that the position where the magnetic stripe 2a passes is closer to the one end surface 11a than the other end surface 11b in the left-right direction.
- the coil 12 is wound around the core 11 via a bobbin.
- the coil 12 is connected to an AC power supply circuit that supplies current to the coil 12.
- AC power is supplied to the coil 12
- a disturbing magnetic field is generated in which the direction of the magnetic force line ML1 is directed from one of the one end surface 11a and the other end surface 11b to the other of the one end surface 11a and the other end surface 11b. That is, when AC power is supplied to the coil 12, the disturbing magnetic field generating means 10 causes the magnetic field lines ML1 to be directed from either one of the one end surface 11a and the other end surface 11b to one of the one end surface 11a and the other end surface 11b. Generate a disturbing magnetic field.
- the magnetic field ML1 is periodically disturbed in the direction from the one end surface 11a to the other end surface 11b and from the other end surface 11b to the one end surface 11a.
- a magnetic field (AC magnetic field) is generated.
- the coil 12 may be connected to a drive circuit including a DC power source to which the coil 12 is connected and a capacitor connected in parallel to the coil 12 with respect to the DC power source.
- a resonance circuit is constituted by the capacitor of the drive circuit and the coil 12.
- the coil 12 may be connected to a DC power source via a circuit such as an inverter that converts a DC current into an AC current. That is, when the coil 12 is connected to the DC power source through a predetermined circuit for converting DC current into AC current, the disturbing magnetic field generating means 10 has the direction of the magnetic force line ML1 set to either the one end face 11a or the other end face 11b. You may generate
- the direction of the magnetic force line ML1 is one direction from the one end surface 11a to the other end surface 11b and from the other end surface 11b.
- the timing for fluctuating the direction of the magnetic lines of force ML1 may not be periodic.
- the timing of changing the direction of the magnetic force line ML1 is random. good.
- the direction of entering the other is substantially parallel to the front-rear direction.
- the magnetic field lines ML1 cross the position where the magnetic stripe 2a passes when the card 2 is inserted in the left-right direction.
- the read head 81 for reading the magnetic data recorded on the magnetic stripe 2a in contact with the magnetic stripe 2a is disposed adjacent to the left side of the read head 81 and at a position not in contact with the magnetic stripe 2a.
- a differential type skimming magnetic head 80 having a dummy head 82 is installed in front of the card reader 1 (for example, via a predetermined member or directly, the skimming magnetic head 80 is connected to the card insertion portion 4). If the distance between the read head 81 and the dummy head 82 in the left-right direction is narrow, the intensity of the disturbing magnetic field at the position where the read head 81 is disposed and the position where the dummy head 82 is disposed The difference with the strength of the disturbing magnetic field at is increased.
- the output signal of the read head 81 caused by the disturbing magnetic field varies as shown in FIG. 3D
- the output signal of the dummy head 82 caused by the disturbing magnetic field varies as shown in FIG. To do. That is, there is a large difference between the amplitude of the output signal of the read head 81 caused by the disturbing magnetic field and the amplitude of the output signal of the dummy head 82 caused by the disturbing magnetic field.
- the output signal of the reading head 81 or the dummy head 82 due to the disturbing magnetic field fluctuates as shown in FIG.
- the output signal of the reading head 81 or the dummy head 82 due to the disturbing magnetic field varies as shown in FIG.
- the output signal of the reading head 81 or the dummy head 82 caused by the disturbing magnetic field varies as shown in FIG.
- the disturbing magnetic field generating means 10 generates a disturbing magnetic field. That is, when reading or recording magnetic data by the magnetic head 7, the disturbing magnetic field generating means 10 does not generate a disturbing magnetic field. Further, when the card 2 is inserted into the card insertion slot 3 and the card 2 is taken into the card reader 1, for example, the entire card 2 inserted into the card insertion slot 3 is placed inside the card insertion section 4. Until it is captured, the disturbing magnetic field generating means 10 generates a disturbing magnetic field. Further, when the card 2 is ejected from the card insertion slot 3, for example, the disturbing magnetic field generating means 10 disturbs until the card 2 transported to a position where the user can pull out the card 2 is pulled out by the user. Generate a magnetic field.
- the disturbing magnetic field generating means 10 When the card is inserted, the disturbing magnetic field generating means 10 generates the disturbing magnetic field intermittently until the card 2 is inserted into the card insertion slot 3, for example, and the card 2 is inserted into the card insertion slot 3. When this is detected by an insertion detection sensor (not shown), a disturbing magnetic field is continuously generated. Further, when the inserted card 2 passes through the card insertion slot 3 and is taken into the card reader 1, the disturbing magnetic field generating means 10 stops the disturbing magnetic field. Further, when the card is ejected, the disturbing magnetic field generating means 10 continuously generates the disturbing magnetic field when the card 2 passes through the card insertion slot 3 and is ejected from the inside of the card reader 1 to the outside. When the insertion detection sensor detects that the card 2 has been removed from the card insertion slot 3, a disturbing magnetic field is generated intermittently.
- the one end surface 11a and the other end surface 11b of the core 11 are arranged so as to face substantially the front side, and when the AC power is supplied to the coil 12, the direction of the magnetic force line ML1 is changed.
- a disturbing magnetic field that periodically fluctuates in a direction from the one end surface 11a toward the other end surface 11b and in a direction from the other end surface 11b toward the one end surface 11a is generated.
- the magnetic field lines ML1 cross the position where the magnetic stripe 2a passes when the card 2 is inserted in the left-right direction.
- the disturbing magnetic field strength and the dummy head 82 are arranged at the place where the read head 81 is arranged. Therefore, the difference between the intensity of the disturbing magnetic field at the position of the magnetic head and the amplitude of the output signal of the read head 81 due to the disturbing magnetic field and the amplitude of the output signal of the dummy head 82 due to the disturbing magnetic field are large.
- the core 11 is formed in a rod shape, one end surface of the core 11 faces the right side, and the other end surface of the core 11 faces the left side, the position through which the magnetic stripe 2a passes is left and right. It is possible to generate a disturbing magnetic field so that the magnetic field lines cross in the direction. However, in this case, the magnetic flux density of the disturbing magnetic field at the position where the skimming magnetic head 80 is disposed becomes low, and it is difficult to effectively influence the disturbing magnetic field on the skimming magnetic head 80. .
- the one end surface 11a and the other end surface 11b are formed on a common core 11. Therefore, in this embodiment, it is possible to suppress the leakage of magnetic flux generated by the coil 12. Therefore, in this embodiment, it is possible to effectively exert an influence of the disturbing magnetic field on the skimming magnetic head 80.
- FIG. 4 is a schematic plan view for explaining the configuration of the disturbing magnetic field generating means 10 according to another embodiment of the present invention.
- FIG. 5 is a schematic side view for explaining the configuration of the disturbing magnetic field generating means 10 shown in FIG.
- the disturbing magnetic field generating means 10 includes one core 11, but the disturbing magnetic field generating means 10 is formed of a magnetic material in addition to the core 11, as shown in FIGS.
- the core 21 may be provided.
- the core part 23 is constituted by the two cores 11 and 21.
- the coil 21 is wound around the core 21 as a disturbing magnetic field generating coil via a bobbin.
- the core 21 and the coil 22 are disposed inside the card insertion portion 4 formed in a hollow shape. Further, the core 21 and the coil 22 are disposed below the card passage 6. That is, the core 11 and the core 21 are arranged so as to sandwich the card passage 6 in the vertical direction.
- the core 21 is formed in the same shape as the core 11. That is, the core 21 is formed in a substantially U shape.
- the one end surface 21a and the other end surface 21b of the core 21 are arranged so as to face substantially the front side.
- the one end surface 21a and the other end surface 21b are substantially parallel to the YZ plane and are disposed on substantially the same plane.
- the one end surface 21a and the other end surface 21b are disposed on substantially the same plane as the one end surface 11a and the other end surface 11b.
- the one end surface 21a is disposed between the one end surface 11a and the other end surface 11b
- the other end surface 21b is disposed on the left side of the other end surface 11b.
- the one end surface 21a and the other end surface 21b are arranged at positions shifted from the one end surface 11a and the other end surface 11b in the left-right direction.
- the one end face 21a is a third end face
- the other end face 21b is a fourth end face.
- the core 11 is a first core
- the core 21 is a second core.
- the coil 22 is connected to an AC power supply circuit that supplies current to the coil 22.
- the magnetic field line ML2 is directed from one of the one end face 21a and the other end face 21b to the other one of the one end face 21a and the other end face 21b (hereinafter referred to as a disturbing magnetic field).
- "Second disturbing magnetic field” occurs. That is, when AC power is supplied to the coil 22, the disturbing magnetic field generation means 10 causes the magnetic field lines ML2 to be directed from either one of the one end face 21a and the other end face 21b to one of the one end face 21a and the other end face 21b. A second disturbing magnetic field is generated.
- the direction of the magnetic force line ML2 periodically fluctuates in a direction from the one end surface 21a to the other end surface 21b and a direction from the other end surface 21b to the one end surface 21a. Two disturbing magnetic fields (alternating magnetic fields) are generated.
- the direction in which the magnetic field line ML2 of the second disturbing magnetic field exits from one of the one end surface 21a and the other end surface 21b and the direction from which one of the one end surface 21a and the other end surface 21b enters the other is the front-rear direction. It is almost parallel to it.
- the disturbing magnetic field generated by supplying AC power to the coil 12 and the second disturbing magnetic field generated by supplying AC power to the coil 22 are: It overlaps in front of the card insertion slot 3. That is, in this modified example, the one end surfaces 11a, 21a, and the like are arranged such that the disturbing magnetic field generated by supplying AC power to the coil 12 and the second disturbing magnetic field overlap on the near side of the card insertion slot 3.
- End faces 11b and 21b are arranged. Further, in this modification, the frequency of the disturbing magnetic field generated when the AC power is supplied to the coil 12 is different from the frequency of the second disturbing magnetic field. Alternatively, in this modification, the frequency of the disturbing magnetic field generated when the AC power is supplied to the coil 12 is the same as the frequency of the second disturbing magnetic field, and the AC power is supplied to the coil 12. The phase of the disturbing magnetic field is shifted from the phase of the second disturbing magnetic field.
- the difference between the intensity of the second disturbing magnetic field at the position where the reading head 81 is disposed and the intensity of the second disturbing magnetic field at the position where the dummy head 82 is disposed may be relatively large. It is possible to make a relatively large difference between the amplitude of the output signal of the read head 81 caused by the second disturbing magnetic field and the amplitude of the output signal of the dummy head 82 caused by the second disturbing magnetic field. Become.
- the output signal of the read head 81 includes a signal corresponding to the magnetic data recorded on the card 2, a signal corresponding to the disturbing magnetic field generated by supplying AC power to the coil 12, and the second signal.
- the signal corresponding to the disturbing magnetic field is superimposed on the signal, and the output signal of the dummy head 82 is a signal corresponding to the disturbing magnetic field generated when the AC power is supplied to the coil 12 and a signal corresponding to the second disturbing magnetic field. Therefore, a read signal of magnetic data that is not affected by the disturbing magnetic field and the second disturbing magnetic field is obtained from the difference between the output signal of the read head 81 and the output signal of the dummy head 82. Becomes even more difficult. Therefore, in this modification, it is possible to effectively prevent skimming by the differential skimming magnetic head 80.
- the frequency of the disturbing magnetic field generated when the AC power is supplied to the coil 12 is different from the frequency of the second disturbing magnetic field, or the AC power is supplied to the coil 12.
- the frequency of the generated disturbing magnetic field is the same as the frequency of the second disturbing magnetic field, and the phase of the disturbing magnetic field generated when the AC power is supplied to the coil 12 is shifted from the phase of the second disturbing magnetic field.
- the core 11 and the core 21 are arranged so as to sandwich the card passage 6 in the vertical direction.
- both the core 11 and the core 21 are above or below the card passage 6.
- the frequency of the disturbing magnetic field generated when the AC power is supplied to the coil 12 is the same as the frequency of the second disturbing magnetic field, and the AC power is supplied to the coil 12.
- the phase of the disturbing magnetic field may coincide with the phase of the second disturbing magnetic field.
- the core 11 and the core 21 are arranged so as to sandwich the card passage 6 in the vertical direction, but the core 11 and the core 21 are arranged on the upper side or the lower side of the card passage 6. May be.
- the one end surface 21a and the other end surface 21b are not arranged so as to sandwich the position where the magnetic stripe 2a passes in the left-right direction.
- the end surface 21b may be disposed so as to sandwich the position where the magnetic stripe 2a passes in the left-right direction.
- the other end surface 21b is disposed between the one end surface 11a and the other end surface 11b in the left-right direction, and the one end surface 21a is disposed on the right side of the one end surface 11a.
- FIG. 6 is a schematic plan view for explaining the configuration of the disturbing magnetic field generating means 10 according to another embodiment of the present invention.
- the core 11 on which the one end face 11a and the other end face 11b are formed and the core 21 on which the one end face 21a and the other end face 21b are formed are formed separately.
- the fourth end face 31d corresponding to the end face 21b may be formed on a common core 31.
- the core 31 has a rod-shaped first core portion 31e, a second core portion 31f, a third core portion 31g, and a fourth core portion 31h that are disposed with the front-rear direction as a longitudinal direction when viewed from the vertical direction. And a rod-like connecting core portion 31j that is arranged with the left-right direction as the longitudinal direction when viewed from the up-down direction and connects the rear ends of the first to fourth core portions 31e-31h.
- the core portion 33 is constituted by one core 31.
- the front end surface of the first core portion 31e is a first end surface 31a
- the front end surface of the second core portion 31f is a second end surface 31b
- the front end surface of the third core portion 31g is a third end surface. It is an end face 31c
- the front end face of the fourth core portion 31h is a fourth end face 31d.
- a coil 34 as a disturbing magnetic field generating coil is wound around the first core portion 31e and the second core portion 31f
- a coil as a disturbing magnetic field generating coil is wound around the third core portion 31g and the fourth core portion 31h. 35 is wound.
- the winding direction of the coil part 35a which is the part wound around the third core part 31g of the coil 35 and the part wound around the fourth core part 31h of the coil 35 are opposite to each other. This is the direction opposite to the winding direction of the coil portion 35b.
- the core 31 and the coils 34 and 35 are arranged on the upper side or the lower side of the card passage 6.
- the coil 34 is connected to an AC power supply circuit that supplies current to the coil 34
- the coil 35 is connected to an AC power supply circuit that supplies current to the coil 35.
- AC power is supplied to the coil 34
- the direction of the magnetic force line ML1 is changed from the first end surface 31a to the second end surface 31b and from the second end surface 31b to the first end surface 31a, as in the above-described embodiment.
- a disturbing magnetic field (AC magnetic field) that fluctuates periodically is generated.
- the magnetic field line ML1 crosses the position where the magnetic stripe 2a passes when the card 2 is inserted in the left-right direction.
- Each of the two coils may be wound around each of the core portion 31e and the second core portion 31f, and an AC power supply may be connected to each of the two coils.
- Two coils may be wound around each of the third core portion 31g and the fourth core portion 31h, and an AC power supply may be connected to each of the two coils.
- FIG. 7 is a schematic plan view for explaining the configuration of the disturbing magnetic field generating means 10 according to another embodiment of the present invention.
- the fourth core portion 31h may not be formed as shown in FIG.
- the coil 35 is wound around the third core portion 31g, and when AC power is supplied to the coil 35, the direction of the magnetic force line ML3 is directed toward the third end surface 31c and the third end surface 31c.
- a disturbing magnetic field (alternating magnetic field) that periodically fluctuates in the direction of travel is generated.
- the disturbing magnetic field generated when the AC power is supplied to the coil 34 and the disturbing magnetic field generated when the AC power is supplied to the coil 35 are overlapped on the front side of the card insertion slot 3. Therefore, also in this modified example, skimming by the differential skimming magnetic head 80 can be effectively prevented.
- FIG. 8 is a schematic plan view for explaining the configuration of the disturbing magnetic field generating means 10 according to another embodiment of the present invention.
- FIG. 9 is a diagram for explaining an output signal of the detection coil 52 shown in FIG. 8, and FIG. 9A is a detection coil 52 when the skimming magnetic head 80 is not installed in front of the card reader 1.
- FIG. 4B is a diagram showing an output signal of the detection coil 52 when the skimming magnetic head 80 is installed in front of the card reader 1.
- the disturbing magnetic field generator 10 may include a detection coil 52 that detects a change in the disturbing magnetic field that is generated when an AC power supply is supplied to the coil 12.
- the core 11 includes a rod-shaped first core portion 11 d and a second core portion 11 e that are disposed with the front-rear direction as a longitudinal direction when viewed from the vertical direction, and the vertical direction. It is composed of a rod-shaped connecting core portion 11f that is arranged with the left-right direction as the longitudinal direction when viewed, and connects the rear ends of the first core portion 11d and the second core portion 11e.
- the front end surface of the first core portion 11d is one end surface 11a
- the front end surface of the second core portion 11e is the other end surface 11b.
- the coil 12 is divided into a coil portion 12a wound around the first core portion 11d and a coil portion 12b wound around the second core portion 11e.
- the coil 12 is connected to an AC power supply circuit 54 that supplies current to the coil 12.
- the detection coil 52 is wound around the connecting core portion 11f. That is, the detection coil 52 is wound around the core 11.
- the detection coil 52 detects a change in magnetic flux passing through the connecting core portion 11f.
- the detection coil 52 is connected to the detection circuit 55, and the output signal of the detection coil 52 is input to the detection circuit 55.
- symbol is attached
- the output signal of the detection coil 52 varies in the form of a sine wave with an amplitude corresponding to the intensity of the disturbing magnetic field and the same period as the period of the disturbing magnetic field.
- the disturbing magnetic field changes, so that the amplitude of the output signal of the detection coil 52 changes.
- the amplitude of the output signal of the detection coil 52 having a small amplitude as shown in FIG.
- the amplitude changes as shown in FIG. 9B.
- the amplitude of the output signal of the detection coil 52 (the output signal shown in FIG. 9B) when the skimming magnetic head 80 is installed in front of the card reader 1 is the skimming magnetic in front of the card reader 1. It becomes larger than the amplitude of the output signal of the detection coil 52 when the head 80 is not installed (the output signal shown in FIG. 9A). Therefore, the detection circuit 55 detects whether or not the skimming magnetic head 80 is installed in front of the card reader 1 based on the amplitude of the output signal of the detection coil 52. Further, when the card reader 1 detects that the skimming magnetic head 80 is installed in front, predetermined abnormality processing such as sending an alarm to the host device is executed.
- FIG. 10 is a schematic plan view for explaining the configuration of the disturbing magnetic field generating means 10 according to another embodiment of the present invention.
- FIG. 11 is a diagram for explaining a difference signal between the output signal of the detection coil 62 and the output signal of the detection coil 63 shown in FIG. 10, and (A) shows a skimming magnetic head in front of the card reader 1.
- FIG. 8B is a diagram showing a differential signal when 80 is not installed, and FIG. 8B is a diagram showing a differential signal when skimming magnetic head 80 is installed in front of card reader 1.
- the disturbing magnetic field generation apparatus 10 is configured such that a detection coil 62 that detects a change in the disturbing magnetic field caused by supplying an AC power to the coil 34 and an AC power supply to the coil 35. And a detection coil 63 as a second detection coil for detecting a change in the second disturbing magnetic field generated in step (1).
- the detection coil 62 is wound around a portion of the connection core portion 31j between the first core portion 31e and the third core portion 31g, and the detection coil 63 is connected to the connection core portion 31j. Is wound around a portion between the second core portion 31f and the fourth core portion 31h. That is, the detection coils 62 and 63 are wound around the core 31.
- the detection coil 62 detects a change in magnetic flux passing through a portion of the connecting core portion 31j between the first core portion 31e and the third core portion 31g, and the detecting coil 63 is connected to the connecting core portion 31j. A change in magnetic flux passing through a portion between the second core portion 31f and the fourth core portion 31h is detected.
- the detection coil 62 and the detection coil 63 are connected in series. That is, one end of the detection coil 62 and one end of the detection coil 63 are connected.
- the winding direction of the detection coil 62 and the winding direction of the detection coil 63 are opposite to each other.
- the number of turns of the detection coil 62 and the number of turns of the detection coil 63 are equal.
- the other ends of the detection coils 62 and 63 are connected to the detection circuit 65, and a differential signal that is a difference between the output signal of the detection coil 62 and the output signal of the detection coil 63 is input to the detection circuit 65. Is done.
- FIG. 10 the same reference numerals are given to the same configurations as those of the modification shown in FIG.
- the coil 34 is connected to an AC power supply circuit 66 that supplies current to the coil 34, and the coil 35 is connected to an AC power supply circuit 67 that supplies current to the coil 35.
- the direction of the magnetic force line ML2 is periodically changed in a direction from the third end face 31c toward the fourth end face 31d and a direction from the fourth end face 31d toward the third end face 31c. Two disturbing magnetic fields are generated.
- the frequency of the disturbing magnetic field is equal to the frequency of the second disturbing magnetic field. That is, the fluctuation period of the direction of the magnetic field lines of the disturbing magnetic field is equal to the fluctuation period of the direction of the magnetic field lines of the second disturbing magnetic field. Further, the phase of the disturbing magnetic field and the phase of the second disturbing magnetic field are the same. Specifically, when the disturbance magnetic field in the direction in which the direction of the magnetic force line ML1 is directed from the first end surface 31a to the second end surface 31b starts to be generated, the direction of the magnetic force line ML2 is in the direction from the third end surface 31c to the fourth end surface 31d.
- the direction of the magnetic force line ML2 is changed in the direction from the fourth end face 31d to the third end face 31c.
- a second disturbing magnetic field begins to occur.
- the strength (amplitude) of the disturbing magnetic field is equal to the strength (amplitude) of the second disturbing magnetic field.
- the magnetic force line ML1 crosses the position where the magnetic stripe 2a passes when the card 2 is inserted, but the magnetic force line ML2 does not cross the position where the magnetic stripe 2a passes when the card 2 is inserted (that is, the magnetic force lines).
- the core 31 is disposed so that ML2 passes through a position avoiding the position where the magnetic stripe 2a passes when the card 2 is inserted.
- the coil 34 is connected to the AC power supply circuit 66, and the coil 35 is connected to the AC power supply circuit 67.
- the coil 34 and the coil 35 may be connected to a common AC power supply circuit. good.
- the winding direction of the detection coil 62 and the winding direction of the detection coil 63 are opposite to each other.
- the frequency of the disturbing magnetic field is equal to the frequency of the second disturbing magnetic field
- the phase of the disturbing magnetic field is the same as the phase of the second disturbing magnetic field
- the strength of the disturbing magnetic field is The intensity of the disturbing magnetic field is equal, and the disturbing magnetic field and the second disturbing magnetic field are balanced. Therefore, the difference signal between the output signal of the detection coil 62 and the output signal of the detection coil 63 when the skimming magnetic head 80 is not installed in front of the card reader 1 is shown in FIG.
- the signal is a sinusoidal signal having the same period as that of the disturbing magnetic field and the second disturbing magnetic field and having a very small amplitude.
- a difference signal between the output signal of the detection coil 62 and the output signal of the detection coil 63 is not output.
- the detection circuit 65 detects whether or not the skimming magnetic head 80 is installed in front of the card reader 1 based on the amplitude of the difference signal. Further, when the card reader 1 detects that the skimming magnetic head 80 is installed in front, predetermined abnormality processing such as sending an alarm to the host device is executed.
- This modification can obtain the same effect as that of the modification shown in FIG.
- the winding direction of the detection coil 62 and the winding direction of the detection coil 63 are opposite, and the frequency of the disturbing magnetic field is equal to the frequency of the second disturbing magnetic field.
- the phase of the disturbing magnetic field and the phase of the second disturbing magnetic field are the same, the strength of the disturbing magnetic field is equal to the strength of the second disturbing magnetic field, and the balance between the disturbing magnetic field and the second disturbing magnetic field is Therefore, the difference signal between the output signal of the detection coil 62 and the output signal of the detection coil 63 is a sinusoidal signal that fluctuates at a constant period.
- the amplitude of the differential signal when the skimming magnetic head 80 is not installed in front of the card reader 1 can be made constant and reduced. It becomes possible. Therefore, it is possible to appropriately set the threshold value of the difference signal for determining whether or not the skimming magnetic head 80 is installed in front of the card reader 1. As a result, it is possible to accurately detect whether the skimming magnetic head 80 is installed in front of the card reader 1 based on the amplitude of the difference signal.
- the winding direction of the detection coil 62 and the winding direction of the detection coil 63 may be the same direction.
- the direction of the magnetic force line ML2 is in the direction from the fourth end surface 31d to the third end surface 31c.
- the direction of the magnetic force line ML2 is changed in the direction from the third end face 31c to the fourth end face 31d.
- the difference signal between the output signal of the detection coil 62 and the output signal of the detection coil 63 is a sinusoidal signal that fluctuates at a constant period. Even if the ambient temperature of the disturbing magnetic field generating means 10 fluctuates, the amplitude of the differential signal when the skimming magnetic head 80 is not installed in front of the card reader 1 can be made constant and reduced. It becomes possible.
- the winding direction of the detection coil 62 and the winding direction of the detection coil 63 are opposite to each other, and the phase of the disturbing magnetic field and the phase of the second disturbing magnetic field are Is equal to the winding direction of the detection coil 63 and the winding direction of the detection coil 63, and the phase of the disturbing magnetic field and the second disturbing magnetic field
- the detection sensitivity by the detection coils 62 and 63 increases when the phase is reversed. Therefore, in this case, it is possible to more accurately detect whether or not the skimming magnetic head 80 is installed in front of the card reader 1.
- the detection coil 62 and the detection coil 63 may be connected to the detection circuit 65 in parallel.
- the detection circuit 65 generates a difference signal between the output signal of the detection coil 62 and the output signal of the detection coil 63.
- the detection coil 62 or the detection coil 63 may be wound around a portion of the connecting core portion 31j between the second core portion 31f and the third core portion 31g.
- the frequency of the disturbing magnetic field may be different from the frequency of the second disturbing magnetic field
- the phase of the disturbing magnetic field may be different from the phase of the second disturbing magnetic field
- the strength of the magnetic field may be different from the strength of the second disturbing magnetic field.
- the magnetic field line ML2 may cross the position where the magnetic stripe 2a passes when the card 2 is inserted.
- the disturbing magnetic field generator 10 includes a detection coil for detecting a change in the disturbing magnetic field generated when the AC power is supplied to the coil 12, and an AC power source for the coil 22. You may provide the 2nd coil for a detection which detects the change of the 2nd disturbance magnetic field which arises by being supplied.
- the one end surface 11a and the other end surface 11b of the core 11 are arranged on substantially the same plane.
- the one end surface 11a and the other end surface 11b may be arranged at positions shifted in the front-rear direction.
- the one end surface 11a and the other end surface 11b are substantially parallel to the YZ plane.
- the one end surface 11a and the other end surface 11b are arranged so as to face substantially the front side, As shown in FIG. 12 (A), it may be inclined with respect to the YZ plane so as to go backward as it goes inward in the left-right direction, or as shown in FIG. 12 (B).
- the direction of the magnetic force line ML1 is the direction from the one end surface 11a toward the other end surface 11b.
- a disturbing magnetic field that periodically fluctuates in the direction from the other end surface 11b to the one end surface 11a, and the magnetic field lines ML1 cross the position where the magnetic stripe 2a passes when the card 2 is inserted in the left-right direction.
- the one end surface 21a and the other end surface 21b of the core 21 shown in FIGS. 4 and 5 may be displaced in the front-rear direction. Further, the one end face 21a and the other end face 21b may be inclined with respect to the YZ plane as long as they are arranged so as to face substantially the front side. Moreover, the 1st end surface 31a, the 2nd end surface 31b, the 3rd end surface 31c, and the 4th end surface 31d which are shown in FIG.6, FIG.7, FIG.10 may shift
- the core portion 13 of the disturbing magnetic field generating means 10 is constituted by a single core 11.
- the core portion 13 is composed of two rod-like cores 41 and 42 arranged with the front-rear direction as a longitudinal direction when viewed from the up-down direction.
- two cores 41 and 42 formed separately may be arranged.
- the coil 12 is wound around the cores 41 and 42, the winding direction of the coil portion 12 a that is the portion of the coil 12 wound around the core 41, and the coil 12 is wound around the core 42.
- the winding direction of the coil portion 12b which is a portion to be turned, is opposite to the winding direction.
- the direction of the magnetic force line ML1 is periodically changed from the front end surface 41a of the core 41 toward the front end surface 42a of the core 42 and from the front end surface 42a toward the front end surface 41a.
- a fluctuating magnetic field (alternating magnetic field) is generated.
- the front end face 41a is a first end face
- the front end face 42a is a second end face.
- two cores formed separately may be arranged.
- the core 31 shown in FIG. 6 and the four cores by which the coils 34 and 35 are wound may be arrange
- the disturbing magnetic field generating means 10 includes two cores 11 and 21, but the disturbing magnetic field generating means 10 may include three or more cores.
- the core 31 includes two pairs of cores, a first core portion 31 e and a second core portion 31 f that make a pair, and a third core portion 31 g and a fourth core portion 31 h that make a pair.
- the core 31 may include three or more core parts.
- the magnetic stripe 2a is formed on the back surface of the card 2.
- the magnetic stripe 2a may be formed on the front surface of the card 2, or both the back surface and the front surface of the card 2 may be formed.
- a magnetic stripe 2a may be formed.
- the card reader 1 is a card transport type card reader that includes the drive roller 8 and the pad roller 9.
- the card reader to which the configuration of the present invention is applied is a card reader that is manually inserted by the user.
- a manual card reader that reads and records magnetic data while moving may be used.
- a card reader to which the configuration of the present invention is applied is a so-called dip type card reader that reads and records magnetic data when the card 2 is inserted into the card reader or when the card 2 is pulled out from the card reader. There may be.
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Abstract
Description
図1は、本発明の実施の形態にかかるカードリーダ1の前端側部分の構成を説明するための概略側面図である。図2は、図1に示す妨害磁界発生手段10の構成を説明するための概略平面図である。図3は、図2に示す妨害磁界発生手段10が発生させる妨害磁界の強度および方向性を説明するための図である。
以上説明したように、本形態では、コア11の一端面11aおよび他端面11bは、略手前側を向くように配置されており、コイル12に交流電源が供給されると、磁力線ML1の向きが一端面11aから他端面11bに向かう方向と他端面11bから一端面11aに向かう方向とに周期的に変動する妨害磁界が発生する。また、本形態では、磁力線ML1は、左右方向において、カード2の挿入時に磁気ストライプ2aが通過する位置を横切っている。そのため、本形態では、上述のように、左右方向における読取ヘッド81とダミーヘッド82との間隔が狭くても、読取ヘッド81が配置される箇所での妨害磁界の強度とダミーヘッド82が配置される箇所での妨害磁界の強度との差異が大きくなり、妨害磁界に起因する読取ヘッド81の出力信号の振幅と妨害磁界に起因するダミーヘッド82の出力信号の振幅とに大きな差異が生じる。したがって、本形態では、左右方向における読取ヘッド81とダミーヘッド82との間隔が狭い差動式のスキミング用磁気ヘッド80が使用されても、読取ヘッド81の出力信号とダミーヘッド82の出力信号との差分から妨害磁界の影響を受けていない磁気データの読取信号を取得することが困難になり、その結果、差動式のスキミング用磁気ヘッド80によるスキミングを阻止することが可能になる。
図4は、本発明の他の実施の形態にかかる妨害磁界発生手段10の構成を説明するための概略平面図である。図5は、図4に示す妨害磁界発生手段10の構成を説明するための概略側面図である。
図6は、本発明の他の実施の形態にかかる妨害磁界発生手段10の構成を説明するための概略平面図である。
図7は、本発明の他の実施の形態にかかる妨害磁界発生手段10の構成を説明するための概略平面図である。
図8は、本発明の他の実施の形態にかかる妨害磁界発生手段10の構成を説明するための概略平面図である。図9は、図8に示す検出用コイル52の出力信号を説明するための図であり、(A)はカードリーダ1の前方にスキミング用磁気ヘッド80が設置されていないときの検出用コイル52の出力信号を示す図、(B)はカードリーダ1の前方にスキミング用磁気ヘッド80が設置されたときの検出用コイル52の出力信号を示す図である。
図10は、本発明の他の実施の形態にかかる妨害磁界発生手段10の構成を説明するための概略平面図である。図11は、図10に示す検出用コイル62の出力信号と検出用コイル63の出力信号との差分信号を説明するための図であり、(A)はカードリーダ1の前方にスキミング用磁気ヘッド80が設置されていないときの差分信号を示す図、(B)はカードリーダ1の前方にスキミング用磁気ヘッド80が設置されたときの差分信号を示す図である。
上述した形態および変形例は、本発明の好適な形態の一例ではあるが、これに限定されるものではなく本発明の要旨を変更しない範囲において種々変形実施が可能である。
2 カード
2a 磁気ストライプ
3 カード挿入口
4 カード挿入部
6 カード通過路
10 妨害磁界発生手段
11 コア(第1コア)
11a 一端面(第1端面)
11b 他端面(第2端面)
12、22、34、35 コイル(妨害磁界発生用コイル)
13、23、33 コア部
21 コア(第2コア)
21a 一端面(第3端面)
21b 他端面(第4端面)
31、41、42 コア
31a 第1端面
31b 第2端面
31c 第3端面
31d 第4端面
41a 前端面(第1端面)
42a 前端面(第2端面)
52、62 検出用コイル
63 検出用コイル(第2の検出用コイル)
ML1 妨害磁界の磁力線
ML2 第2の妨害磁界の磁力線
X カードの通過方向
X1 奥側(カードの挿入方向側)
X2 手前側(カードの排出方向側)
Y カードの幅方向
Z カードの厚さ方向
Claims (10)
- 磁気ストライプを有するカードが挿入されるカード挿入口と、前記カード挿入口から挿入された前記カードが通過するカード通過路と、前記磁気ストライプに記録された磁気データの不正な読取りを妨害するための磁界を発生させる妨害磁界発生手段とを備え、
前記妨害磁界発生手段は、磁性材料で形成される少なくとも1個のコアを有するコア部と、前記コアに巻回される妨害磁界発生用コイルとを備え、
前記カードの通過方向の一方側である前記カード挿入口への前記カードの挿入方向側を奥側とし、前記カードの通過方向の他方側である前記カード挿入口からの前記カードの排出方向を手前側とすると、
前記コア部は、略手前側を向くように配置される第1端面および第2端面を備え、
前記妨害磁界発生手段は、磁力線の向きが前記第1端面から前記第2端面に向かう方向と前記第2端面から前記第1端面に向かう方向とに変動する妨害磁界を発生させ、
前記妨害磁界の磁力線の、前記第1端面および前記第2端面のいずれか一方から出ていく方向、および、前記第1端面および前記第2端面のいずれか他方に入ってくる方向は、前記カードの通過方向に略平行になっており、
前記妨害磁界の磁力線は、前記カードの通過方向と前記カードの厚さ方向とに直交する前記カードの幅方向において、前記カードの挿入時に前記磁気ストライプが通過する位置を横切ることを特徴とするカードリーダ。 - 前記第1端面と前記第2端面とが共通の1個の前記コアに形成されていることを特徴とする請求項1記載のカードリーダ。
- 前記コア部は、略手前側を向くように配置されるとともに前記カードの幅方向において前記第1端面および前記第2端面とずれた位置に配置される第3端面および第4端面を備え、
前記妨害磁界発生手段は、磁力線の向きが前記第3端面から前記第4端面に向かう方向と前記第4端面から前記第3端面に向かう方向とに変動する第2の妨害磁界を発生させ、
前記第2の妨害磁界の磁力線の、前記第3端面および前記第4端面のいずれか一方から出ていく方向、および、前記第3端面および前記第4端面のいずれか他方に入ってくる方向が前記カードの通過方向に略平行になっており、
前記第1端面、前記第2端面、前記第3端面および前記第4端面は、前記カード挿入口よりも手前側で前記妨害磁界と前記第2の妨害磁界とが重なるように配置されていることを特徴とする請求項1または2記載のカードリーダ。 - 前記コア部は、前記コアとして、前記第1端面と前記第2端面とが形成される第1コアと、前記第3端面と前記第4端面とが形成される第2コアとを備え、
前記第1コアと前記第2コアとは、前記カードの厚さ方向において、前記カード通過路を挟むように配置されていることを特徴とする請求項3記載のカードリーダ。 - 前記第1端面と前記第2端面と前記第3端面と前記第4端面とが共通の1個の前記コアに形成されていることを特徴とする請求項3記載のカードリーダ。
- 前記妨害磁界では、磁力線の向きが前記第1端面から前記第2端面に向かう方向と前記第2端面から前記第1端面に向かう方向とに周期的に変動し、
前記第2の妨害磁界では、磁力線の向きが前記第3端面から前記第4端面に向かう方向と前記第4端面から前記第3端面に向かう方向とに周期的に変動することを特徴とする請求項3から5のいずれかに記載のカードリーダ。 - 前記カード挿入口が形成されるとともに中空状に形成されるカード挿入部を備え、
前記コア部および前記妨害磁界発生用コイルは、前記カード挿入部の内部に配置されていることを特徴とする請求項1から6のいずれかに記載のカードリーダ。 - 前記妨害磁界発生手段は、前記コアに巻回され前記妨害磁界の変化を検出する検出用コイルを備えることを特徴とする請求項1から7のいずれかに記載のカードリーダ。
- 前記妨害磁界発生手段は、前記コアに巻回され前記妨害磁界の変化を検出する検出用コイルと、前記コアに巻回され前記第2の妨害磁界の変化を検出する第2の検出用コイルとを備えることを特徴とする請求項3から6のいずれかに記載のカードリーダ。
- 前記妨害磁界では、磁力線の向きが前記第1端面から前記第2端面に向かう方向と前記第2端面から前記第1端面に向かう方向とに周期的に変動し、
前記第2の妨害磁界では、磁力線の向きが前記第3端面から前記第4端面に向かう方向と前記第4端面から前記第3端面に向かう方向とに周期的に変動し、
前記妨害磁界の磁力線の向きの変動周期と前記第2の妨害磁界の磁力線の向きの変動周期とが等しくなっており、
前記妨害磁界の位相と前記第2の妨害磁界の位相とが同じになっているか、または、前記妨害磁界の位相と前記第2の妨害磁界の位相とが逆になっており、
前記妨害磁界の強度と前記第2の妨害磁界の強度とが等しくなっていることを特徴とする請求項9記載のカードリーダ。
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WO2018163505A1 (ja) * | 2017-03-10 | 2018-09-13 | 日立オムロンターミナルソリューションズ株式会社 | カード処理装置、自動取引装置、およびカード挿入口ユニット |
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WO2020246525A1 (ja) * | 2019-06-06 | 2020-12-10 | 日本電産サンキョー株式会社 | カードリーダ |
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