JP4586151B2 - Paper sheet identification device - Google Patents

Description

The present invention checks, there is about the sheet identifying equipment for detecting a magnetic substance which is printed on the surface of a paper sheet such as a banknote, in particular, to reduce costs improving and manufacturing identification accuracy It is possible to plan.

  Conventionally, the presence or absence, amount, and shading pattern of magnetic ink (printing ink containing magnetic substances) embedded in paper sheets such as banknotes and checks are detected by a magnetic sensor. In addition, there is a magnetic paper sheet identification sensor for identifying the type and type. In order to improve the identification accuracy of the paper sheet identification sensor, various proposals have been made conventionally (see, for example, Patent Document 1 and Patent Document 2).

  The invention disclosed in Patent Document 1 is provided with two magnetic heads, a differential magnetic head and a residual magnetic detection type magnetic head, and obtains a ratio between the maximum magnetic flux density and the residual magnetic flux density of the magnetic ink, and the value of this ratio is obtained. And the set value are compared, it is possible to reliably identify the type of magnetic ink of the paper sheet.

  The invention disclosed in Patent Document 2 detects an inductance change of a winding wound around two U-shaped magnetic cores arranged with a paper-like object interposed therebetween, and is attached to the paper-like object. By detecting the light and shade pattern corresponding to the magnetic material, the detection output hardly changes even when the distance between the sample and the magnetic core of the detector changes, so that high-resolution identification can be performed.

  As described above, the conventional wound bulk sensor has a plurality of magnetic heads to improve identification accuracy (see Patent Document 1) or a plurality of magnetic cores to improve resolution (Patent Document). 2).

Japanese Patent No. 4-52518 Japanese Patent No. 4-27512

  However, the above-described conventional wound bulk sensor has the following problems.

  First, using the property that counterfeit paper sheets are generally thicker than true paper sheets, the above-mentioned method is used to improve identification accuracy by detecting the thickness of the paper sheets. There is a problem in that a thickness measuring sensor must be provided separately because the winding type bulk sensor cannot measure the thickness.

  Further, from the viewpoint of increasing the speed of paper sheet identification processing and increasing the resolution, it is necessary to arrange a magnetic sensor for each channel in order to increase the number of magnetic sensors to a plurality of channels. The arrangement of the magnetic sensor for each channel has a problem in that it is difficult to form a magnetic path, resulting in an increase in manufacturing cost.

  Furthermore, in a general wire-wound bulk sensor, the relationship between the distance between the magnetic core and the paper sheet and the detection output is inversely proportional, so the shorter the distance between the magnetic core and the paper sheet, the larger the detection output. (See FIG. 2 of Japanese Patent Laid-Open No. 4-27512), the identification accuracy can be improved. However, when the detection output becomes maximum, that is, when the distance between the magnetic core and the paper sheet becomes zero, friction occurs between the magnetic core and the paper sheet, resulting in deterioration of the wear of the paper sheet. There is a problem that.

  The present invention has been made in view of the above points, and an object of the present invention is to detect a magnetic substance embedded in a paper sheet and to detect the thickness of the paper sheet. To provide an identification device.

  In addition, the present invention provides a paper sheet identification device that does not increase the manufacturing cost even if the magnetic sensor is multi-channeled, and can further prevent the paper sheet from being worn away. Is to provide.

  In order to solve the above-described problems, the present invention provides a paper sheet identification device including a paper sheet identification sensor that detects a magnetic substance and a counter member that faces the sensor, and the counter member is electrically conductive. A material or a magnetic material is provided in whole or in part, and either the paper sheet identification sensor or the facing member is biased in a direction in which both come into contact with each other.

  In addition, the present invention is characterized in that the sensor cores constituting the two or more paper sheet identification sensors are integral cores.

  Furthermore, the present invention is characterized in that, in order to detect a magnetic substance printed on the surface of a paper sheet, a sliding contact surface that is in sliding contact with the paper sheet is formed in a thin film shape from zirconia.

  More specifically, the present invention provides the following.

(1) In order to detect a magnetic substance printed on the surface of a paper sheet, a paper sheet identification sensor arranged with the magnetic sensing part facing the conveyance path, and facing the paper sheet identification sensor on the conveyance path And the opposing member includes at least a part of a conductive material or a magnetic material, and at least one of the paper identification sensor and the opposing member. Is urged in the direction in which the paper sheet identification sensor and the opposing member come into contact with each other in the thickness direction of the paper sheet on the conveyance path, and is based on an output signal from the paper sheet identification sensor. And a sensor signal processing circuit for detecting the thickness of the paper sheet and the magnetic substance .

  According to the present invention, in order to detect a magnetic substance printed (embedded) on the surface of a paper sheet such as a check or banknote, the transport path through which the paper sheet is transported through a magnetically sensitive part that senses magnetism. In the paper sheet identification device provided with a paper sheet identification sensor arranged toward the paper and a counter member facing the paper sheet identification sensor on the transport path, the counter member is a conductive material such as aluminum or iron Or at least a part (all or part) of the magnetic material, and at least one of the paper sheet identification sensor and the facing member is in the thickness direction of the paper sheet on the transport path, and Since the paper sheet identification sensor and the counter member are biased in the contact direction, the paper sheet identification sensor or the counter member biased in the direction of contact between the paper sheet identification sensor and the counter member Paper sheet being transported on the transport path It will be displaced in accordance with the thickness.

  Therefore, the magnetic substance printed on the paper sheet is detected by measuring the amount of displacement as a change in the magnetic permeability or eddy current in the opposing member "comprising at least a part of the conductive material or magnetic material". In addition, the thickness of the paper sheet can also be detected, and the detection accuracy can be improved by using the detection result for identifying the paper sheet.

  In addition, in the paper sheet identification apparatus according to the present invention, it is not necessary to provide a separate thickness sensor, so that it is possible to improve identification accuracy (identification capability) while preventing an increase in manufacturing cost.

  Here, as the “paper sheet identification sensor”, a separately excited type sensor comprising a coil that is excited by an AC signal supplied from a power supply circuit and a coil that is detected as an electromagnetic signal as separate coils, and an impedance There are two types of sensors: a self-excited sensor in which a resistor is provided for capturing a change, and a coil that is excited by an AC signal supplied from a power supply circuit and a coil that is detected as an electromagnetic signal are composed of the same coil. However, by adopting a self-excited sensor, the excitation function and the detection function can be achieved with a single coil, which in turn contributes to a reduction in the arrangement space and cost reduction of the entire paper sheet identification device. it can. However, the present invention is not limited to the self-excited sensor.

  In the present invention, at least one of the paper sheet identification sensor and the facing member is in the thickness direction of the paper sheet on the transport path, and the paper sheet identification sensor and the facing member are in contact with each other. Although it is “biased” in the direction, the paper sheet identification sensor and the opposing member do not necessarily have to contact each other. That is, even if the paper sheet identification sensor is not in contact with the facing member, the effect (thickness detection) of the present invention can be achieved.

  (2) The opposing member is a rubber roller having a core portion formed of a conductive material or a magnetic material as a center, and the rubber roller is urged in a radial direction by an elastic member and comes into contact with the paper sheet identification sensor. A paper sheet identification device characterized by that.

  According to the present invention, the above-described facing member is a rubber roller having a core portion formed of a conductive material or a magnetic material as a center, and the rubber roller is urged in the radial direction by an elastic member such as rubber or a spring. The rubber roller will function as a thickness sensor, and as a result, the thickness of the paper sheet can be detected simultaneously with the detection of the magnetic substance, improving the identification accuracy. Can be made.

(3) the sensor core of each said provided a paper sheet two or more sheet identifying sensors disposed adjacent to each other in the conveying direction in a direction substantially orthogonal to constitute pre SL more of the sheet identifying sensors The paper sheet identifying apparatus is characterized in that each is a monolithic integrated core.

  According to the present invention, in order to detect magnetic substances printed (embedded) on the surface of paper sheets such as checks and banknotes, they are adjacent to each other in a direction substantially perpendicular to the transport direction of the paper sheets. In the paper sheet identification device including two or more paper sheet identification sensors that are arranged, the sensor cores that constitute the two or more paper sheet identification sensors are integrated into an integral core. It is not necessary to arrange a paper sheet identification sensor for each channel.

  In other words, by using an integral core that is structurally integrated, it is possible to easily realize multi-channeling without providing a paper sheet identification sensor for each channel, and thus speeding up the paper sheet identification process. The resolution can be increased, and the manufacturing cost can be reduced. In addition, by using an integral core that is structurally integrated, it is possible to improve the arrangement dimension accuracy of the magnetic poles.

  In addition, when the integral core is used, the magnetic path can be easily formed, so that the design of the magnetic circuit is facilitated, and as a result, the manufacturing cost can be reduced.

  Here, “adjacent” includes not only that a plurality of paper sheet identification sensors are in contact with each other but also being arranged at regular intervals.

  (4) The sheet identifying apparatus, wherein the integral core is formed by cutting a magnetic material.

  Since the above-described integrated core is formed by cutting a magnetic material, the above-described integrated core can be easily manufactured, which leads to cost reduction of the paper sheet identification device.

(5) the paper sheet recognition sensor comprises a sliding surface in sliding contact with the paper sheet, before Kisuri facing surface is paper, characterized in that it comprises a sliding layer formed into a thin film by zirconia Kind identification device.

  According to the present invention, in order to detect a magnetic substance printed (embedded) on the surface of a paper sheet such as a check or banknote, a paper sheet identification sensor having a sliding contact surface in sliding contact with the paper sheet. In this case, the sliding contact surface is provided with a sliding layer formed in a thin film of zirconia (zirconium dioxide) with good sliding properties, so that the friction generated between the paper sheet and the paper sheet identification sensor. Resistance can be reduced. Thereby, the wear deterioration of the paper sheets can be prevented. In addition, the life of the paper sheet identification sensor can be extended.

  Zirconia, which has high toughness and hardness, is an optimum material for thinning. By using this zirconia, the gap between the medium and the sensor can be reduced, resulting in the production of a highly sensitive sensor. It becomes possible.

(6) and the core body constituting the paper sheet recognition sensor, the paper sheet on which a sliding layer formed on the sliding contact surface, characterized in that it is formed integrally by insert molding using a resin material Kind identification device.

  According to the present invention, the core body constituting the paper sheet identification sensor described above and the sliding layer formed on the sliding contact surface described above are integrally formed by insert molding using a resin material. Therefore, it is possible to easily manufacture a paper sheet identification sensor that can prevent the paper sheet from being worn down, leading to a reduction in cost.

  Note that, by adopting a structure in which insert molding using a resin material such as an epoxy resin is performed, thin zirconia can be held, and the unevenness of the detection surface can be 5 μm or less.

  As described above, the paper sheet identification device and the paper sheet identification sensor according to the present invention include either the paper sheet identification sensor or the opposing member that is provided with all or part of the conductive material or the magnetic material. Since it is biased in the other direction, the thickness can be measured together with the detection of the magnetic substance, and the identification accuracy can be improved.

  In addition, since an integral core that is structurally integrated is employed, magnetic path formation is facilitated, leading to a reduction in manufacturing cost.

  Furthermore, since the surface in sliding contact with the paper sheet is formed in a thin film shape with slidable zirconia, the frictional resistance generated between the paper sheet and the paper sheet identification sensor can be reduced. As a result, it is possible to prevent the paper sheets from being worn out.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

[Schematic structure]
FIG. 1 is a diagram showing a schematic structure of a sensor unit 1 of a paper sheet identification sensor according to an embodiment of the present invention.

  In FIG. 1, a sensor unit 1 of a paper sheet identification sensor according to an embodiment of the present invention includes a sensor core 10, a plurality of coils 11 wound around a part of the sensor core and arranged adjacent to each other, and And a plurality of coils 12 provided at opposite positions (on the upper side of the sensor core 10) with the sensor core 10 interposed therebetween.

  The sensor core 10 is formed by cutting a magnetic material and has an integrated structure in which a large number of magnetic poles are integrated. A large number of magnetic poles are arranged in a line in a direction substantially perpendicular to the conveyance direction of the medium 2. In FIG. 1, the direction of the magnetic flux is opposite between the coils adjacent in the horizontal direction. However, the present invention is not limited to this. For example, the direction of the magnetic flux between the coils adjacent in the horizontal direction is the same. It may be.

  The coil 11 has a function as a magnetic sensing unit that senses magnetic ink printed on the medium 2. In addition, the coil 12 constitutes a differential circuit with the coil 11 so that an output signal can be obtained when the inductance balance with the coil 11 is lost, thereby improving the temperature characteristics of the paper sheet identification sensor. This contributes to circuit simplification. More specifically, a description will be given with reference to FIG. FIG. 2 is a diagram showing a schematic structure of the paper sheet identification sensor 100 according to the embodiment of the present invention.

  In FIG. 2, the paper sheet identification sensor 100 according to the embodiment of the present invention includes signal lines 13a and 13b for energizing the coils 11 and 12, and bobbins for fixing the coils 11 and 12 and the signal lines 13a and 13b. 14 a and 14 b, a case 15, an epoxy resin 16 filled in the case 15, and an abrasion-resistant zirconia 17 formed as a sliding layer on a sliding contact surface with the medium 2.

  The paper sheet identification sensor 100 shown in FIG. 2 is subjected to insert molding using an epoxy resin. This insert molding will be described in detail in [Manufacturing process of paper sheet identification apparatus]. To do.

  FIG. 3 is a diagram showing a schematic structure of the paper sheet identification apparatus 300 according to the embodiment of the present invention.

  In FIG. 3, a paper sheet identification device 300 according to an embodiment of the present invention includes a paper sheet identification sensor 100 and conductive parts such as aluminum, copper, and iron, iron, ferrite, and the like that are positioned below the paper sheet identification sensor 100. And a separate part 200 (corresponding to an example of the opposing member) made of a magnetic material. In addition, the paper sheet identification sensor 100 is biased by an elastic member 400 such as a spring in the direction of a table having the separate part 200 in part. That is, the sensor unit 1 in the above-described paper sheet identification sensor 100 is also urged in the direction of the base having the separate component 200 in part.

  Accordingly, when the medium 2 is passed through the gap between the paper sheet identification sensor 100 and the table, the paper sheet identification sensor 100 is displaced upward by the thickness of the medium 2, so that the magnetic permeability and the separate body of the separate component 200 are separated. The eddy current flowing through the component 200 changes, and the amount of change is detected as a disturbance in the amount of magnetic flux linked to the coil 11, thereby detecting the magnetic substance printed on the medium 2 and at the same time detecting the thickness of the medium 2. be able to.

  When the printing unit of the medium 2 passes directly below the sensor unit 1 of the paper sheet identification sensor 100, the output signal of the printing unit of the medium 2 is superimposed on the output signal of the thickness of the medium 2, and only the thickness of the medium 2 is obtained. In addition, since the output signal of the printing unit of the medium 2 can be obtained, the authenticity of the medium 2 can be identified by analyzing the print pattern using this output signal. The output signal of the printing unit will be described in detail in [Example].

[Modification]
FIG. 4 is a diagram showing a schematic structure of a paper sheet identification apparatus 300 according to another embodiment of the present invention.

  In FIG. 4, the paper sheet identification sensor 100 is not biased by the elastic member 400 as shown in FIG. 3, while the rubber roller 19 embedded in a part of the table and including the conductive aluminum 18 therein is The elastic member 400 is biased in the vertical direction (the thickness direction of the medium 2).

  Accordingly, when the medium 2 is passed through the gap between the paper sheet identification sensor 100 and the rubber roller 19 in the paper sheet identification device 300, the rubber roller 19 is displaced downward by the thickness of the medium 2. The magnetic permeability and eddy current in a certain conductive aluminum 18 change, and the amount of change is detected as a disturbance in the amount of magnetic flux interlinked with the coil 11, so that the magnetic substance printed on the medium 2 is detected and at the same time the medium 2 Can also be detected.

  Further, the rubber roller 19 shown in FIG. 4 also functions as a conveying unit that conveys the medium 2. According to the structure shown in FIG. 4, it is necessary to separately incorporate a separate part 200 (see FIG. 3). Therefore, the manufacturing cost can be reduced.

[Processing operation]
FIG. 5 is an electric circuit diagram for explaining the processing operation of the paper sheet identification sensor 100 according to the embodiment of the present invention.

In FIG. 5, the drive circuit 51 of the paper sheet identification sensor 100 is a self-excited difference composed of two coils 11 and 12 (see FIG. 1) provided at opposite positions with the sensor core in between as an example of the sensor unit 1. The dynamic magnetic heads S _{1 to} S _{4 are} configured. Further, a power supply circuit 53 (AC power supply) is connected to the drive side of the drive circuit 51, and a sensor signal processing circuit 52 including four identification circuits is connected to the detection side of the drive circuit 51.

The four self-excited differential magnetic heads S _{1 to} S ₄ are arranged adjacent to each other in a direction substantially orthogonal to the paper sheet transport direction. However, “adjacent” here includes not only that the _four self-excited differential magnetic heads S _{1 to} S ₄ are in contact with each other, but also that they are arranged at regular intervals. To do. Although the drive circuit 51 in the case where the number of self-excited differential magnetic heads is four is shown here, the present invention is not limited to four self-excited differential magnetic heads. It may be 12 pieces or 24 pieces used for.

A power supply circuit 53 provided on the drive side of the drive circuit 51 is connected to the ground via two coils 11 and 12 in each of the self-excited differential magnetic heads S _{1 to} S ₄ . The connection point of the two coils is connected to a sensor signal processing circuit 52 provided on the detection side of the drive circuit 51. The sensor signal processing circuit 52 includes a half-wave rectification or full-wave rectification circuit, a low-pass filter, and an operational amplifier. The sensor signal processing circuit 52 amplifies the output signal from the self-excited differential magnetic head, or paper based on the output signal. Various signal processing related to leaf identification is performed, but detailed description thereof is omitted here.

  FIG. 6 is a diagram illustrating a state in which the thickness is measured at the same time as the medium 61 (with the printing units 62a and 62b printed) is identified by the paper sheet identification apparatus 300 according to the embodiment of the present invention. FIG.

In FIG. 6, first, when the medium 61 is inserted from the left side (FIG. 6A), the medium 61 is conveyed rightward by a conveyance belt (not shown) provided in the conveyance path. At this time, the output signals from the self-excited differential magnetic heads S _{1 to} S ₄ are zero.

Next, when the right end portion of the medium 61 is conveyed to just below (or in the vicinity of) the self-excited differential magnetic heads S _{1 to} S ₄ , the output changes by the thickness of the medium 61 (FIG. 6B). ). More specifically, the self-excited differential magnetic heads S _{1 to} S ₄ (see FIG. 3) urged by an elastic member 400 such as a spring have a thickness of the medium 61 when the medium 61 is directly below. Pushed up by the minute. Then, the self-excited differential magnetic heads S _{1 to} S ₄ (see FIG. 5), which are electrically differentially configured by two coils, are separated from the separate parts 200 (see FIG. 3) inside the base. As the eddy current changes, the balance of the inductances of these two coils is lost, so an output signal is transmitted (FIG. 6B).

Next, when the central portion of the medium 61 is conveyed to just below (or in the vicinity of) the self-excited differential magnetic heads S _{1 to} S ₄ , one peak value is output (FIG. 6C). More specifically, when the central portion of the medium 61 is transported to just below (or in the vicinity of) the self-excited differential magnetic heads S _{1 to} S ₄ , the print unit 62 a in the medium 61 is self-excited differential magnetic head. Since it passes directly below (or in the vicinity of) S _{1 to} S ₄ , the output signal of the printing unit 62a of the medium 2 is superimposed on the output signal of the thickness of the medium 2, and one peak value appears. (FIG. 6C).

Similarly, when the printing portion 62b of the medium 61 passes beneath the self-commutated differential magnetic head S ₁ to S ₄ (or its vicinity), the output signal of the thickness of the medium 2, the output of the printing unit 62b of the medium 2 The signals are superimposed and the second peak value appears (FIG. 6 (d)).

Finally, when the medium 61 is separated from (or in the vicinity of) the self-excited differential magnetic heads S _{1 to} S ₄ , the output becomes 0 again (FIG. 6D). This is because the balance of the inductances of the two coils constituting the self-excited differential magnetic heads S _{1 to} S ₄ is maintained again, and the differential output becomes zero.

  The paper sheet identification sensor 100 detects the magnetic material printed on the paper sheet and also detects the thickness of the paper sheet (printing part of the paper sheet) by performing the processing operation described above. be able to.

Note that the present invention is not limited to the electric circuit diagram shown in FIG. 5 as an electric circuit that realizes the processing operation described above. For example, as shown in FIG. 7, as a circuit configuration of the self-excited differential magnetic heads S _{1 to} S ₄ , a bridge circuit using two coils and one adjustment resistor is assembled, and a part of the adjustment resistors and two By adopting a circuit configuration in which the output is extracted from the connection point of the coils, the ripple of the output signal can be removed. Further, as shown in FIG. 8, as a circuit configuration of the self-excited differential magnetic heads S _{1 to} S ₄ , a bridge circuit using two coils and two adjustment resistors (including variable resistors) is assembled and adjusted. By adopting a circuit configuration in which the output is extracted from the two connection points of the resistor and the coil, not only the ripple of the output signal can be removed, but also the temperature characteristics can be improved. Further, in the sensor signal processing circuits 52, 72, and 82 in FIGS. 5, 7, and 8, the circuit configuration is such that the output of the detection circuit is input to the differential amplifier. For example, the circuit configuration may be such that the output of the differential amplifier is input to the detection circuit. Thereby, the temperature characteristic can be further improved.

[Manufacturing process of paper sheet identification device]
FIG. 9 is a process diagram for explaining a manufacturing process for manufacturing the paper sheet identification sensor 100 according to the embodiment of the present invention by insert molding.

  In FIG. 9, first, a mold in which the case 15 is set is prepared (FIG. 9A), and wear-resistant zirconia 17 is loaded on the bottom of the mold (FIG. 9B). For convenience of explanation, illustration of the sensor unit 1, the signal lines 13a and 13b, the bobbins 14a and 14b, and the like is omitted.

  Next, by injecting the epoxy resin 16 into the mold shown in FIG. 9B (FIG. 9C), the wear-resistant zirconia 17 is wrapped with a molten resin and solidified, and a plurality of parts are integrated. The paper sheet identification sensor 100 is made (FIG. 9D).

  In this way, according to the construction method (insert molding) for wrapping a plurality of parts with molten resin, the pitch of each part can be narrowed and reliability can be increased compared to other construction methods such as press-fitting. Become. In addition, by appropriately selecting the concentration or the like of the molten resin, it is possible to seal (fix) a part that is easily deformed or damaged, such as a coil, with the resin.

  In this embodiment, the paper sheet identification sensor 100 is manufactured by insert molding. However, the present invention is not limited to this. For example, the paper sheet identification sensor 100 is manufactured by outsert molding. It is good.

  FIG. 10 is an explanatory diagram for an embodiment of the present invention. More specifically, it shows a state in which the thickness of the medium and the thicknesses of eight print patterns (printing portions) arranged at regular intervals in parallel with the conveyance direction of the medium are electrically detected.

When an evaluation paper (medium) having no print pattern as shown in FIG. 10A passes directly under the paper sheet identification sensor 100, an output change as shown in FIG. 10B is obtained. More specifically, the self-excited differential magnetic heads S _{1 to} S ₄ in the paper sheet identification sensor 100 are displaced upward by the thickness of the evaluation paper when the evaluation paper comes directly below. Then, the eddy current flowing through the separate component 200 (see FIG. 3) inside the table changes, and the self-excited differential magnetic heads S _{1 to} S ₄ transmit an output signal by detecting the change.

  In FIG. 10B, the horizontal axis indicates the displacement of the evaluation paper, and the vertical axis indicates the output [V]. The output waveforms of 1ch to 3ch are waveforms obtained by adding an output signal and an appropriate bias voltage. According to FIG. 10B, the output waveforms 1ch to 3ch from the three paper sheet identification sensors 100 arranged adjacent to each other in the direction substantially orthogonal to the medium transport direction are approximately the same at the same rising timing. The output is about 0.3 [V]. Therefore, the thickness of the medium can be detected by measuring the magnitude of this output having a correlation with the thickness of the medium.

Next, when an evaluation paper (medium) having eight print patterns as shown in FIG. 10C passes directly under the paper sheet identification sensor 100, an output change as shown in FIG. 10D is obtained. It is done. More specifically, the self-excited differential magnetic heads S _{1 to} S ₄ in the paper sheet identification sensor 100 pass eight times as much as the thickness of the print pattern when eight print patterns of the evaluation paper pass. Displaces up. Then, the eddy current flowing through the separate component 200 (see FIG. 3) inside the table changes again, and the self-excited differential magnetic heads S _{1 to} S ₄ detect the change, thereby detecting the number of print patterns. An output signal having the same eight peak values as is transmitted.

  In FIG. 10D, as in FIG. 10B, the horizontal axis indicates the displacement of the evaluation paper, and the vertical axis indicates the output [V]. The output waveforms of 1ch to 3ch are waveforms obtained by adding an output signal and an appropriate bias voltage. According to FIG. 10D, the output waveforms 1ch to 3ch from the three paper sheet identification sensors 100 arranged adjacent to each other in the direction substantially orthogonal to the medium transport direction are approximately the same at the rising timing. An output (peak value of about 1.0 [V]) in which 8 impulse outputs (about 0.7 [V]) corresponding to 8 print patterns are superimposed on an output of about 0.3 [V]. ). Therefore, by measuring the magnitude of this output having a correlation with the thickness of the medium, not only the thickness of the medium but also the thickness of the print pattern can be detected.

  As described above, the paper sheet identification device 300 including the paper sheet identification sensor 100 described above has a sheet thickness detection function in addition to the conventional magnetic substance detection function of the paper sheet. By applying the detection result based on the thickness detection function to paper sheet identification, it is possible to improve the identification accuracy without providing a separate thickness sensor.

  The paper sheet identification device and the paper sheet identification sensor according to the present invention are capable of detecting the thickness of the magnetic material of the paper sheet at the same time by using an elastic member such as a spring. By using zirconia, it is possible to easily form a magnetic path for multi-channeling, and it is useful to prevent wear deterioration of paper sheets by using zirconia having good slidability.

It is a figure which shows schematic structure of the sensor part of the paper sheet identification sensor which concerns on embodiment of this invention. It is a figure which shows schematic structure of the paper sheet identification sensor which concerns on embodiment of this invention. It is a figure which shows schematic structure of the paper sheet identification device which concerns on embodiment of this invention. It is a figure which shows schematic structure of the paper sheet identification device which concerns on other embodiment of this invention. It is an electric circuit diagram for demonstrating the processing operation of the paper sheet identification sensor which concerns on embodiment of this invention. It is explanatory drawing which shows a mode that the thickness is also measured simultaneously with the medium identification by the paper sheet identification device which concerns on embodiment of this invention. FIG. 6 is an electric circuit diagram showing a modification of the electric circuit diagram of FIG. 5. FIG. 6 is an electric circuit diagram showing a modification of the electric circuit diagram of FIG. 5. It is process drawing for demonstrating the manufacturing process which manufactures the paper sheet identification sensor which concerns on embodiment of this invention by insert molding. It is explanatory drawing about the Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sensor part 2 Medium 10 Sensor core 11, 12 Coil 13a, 13b Signal line 14a, 14b Bobbin 15 Case 16 Epoxy resin 17 Abrasion-resistant zirconia 18 Aluminum 19 Rubber roller 100 Paper sheet identification sensor 200 Separate part 300 Paper sheet identification device

Claims (6)

In order to detect the magnetic substance printed on the surface of the paper sheet, a paper sheet identification sensor arranged with the magnetic sensing part facing the transport path, and a facing member facing the paper sheet identification sensor on the transport path And a paper sheet identification device comprising:
The opposing member includes at least a part of a conductive material or a magnetic material, and at least one of the paper sheet identification sensor or the opposing member is in a thickness direction of the paper sheet on the conveyance path, The paper sheet identification sensor and the facing member are biased in a contact direction ,
A paper sheet identification apparatus comprising a sensor signal processing circuit for detecting a thickness of the paper sheet and the magnetic substance based on an output signal from the paper sheet identification sensor .   The opposing member is a rubber roller having a core portion formed of a conductive material or a magnetic material as a center, and the rubber roller is urged in a radial direction by an elastic member to come into contact with the paper sheet identification sensor. The paper sheet identification device according to claim 1. Comprising two or more paper sheet identification sensors arranged adjacent to each other in a direction substantially perpendicular to the paper sheet transport direction ;
3. The paper sheet identification apparatus according to claim 1 , wherein each of the sensor cores constituting the two or more paper sheet identification sensors is an integral core having an integral structure.   4. The paper sheet identification apparatus according to claim 3, wherein the integral core is formed by cutting a magnetic material. The paper sheet recognition sensor comprises a sliding surface in sliding contact with the paper sheet, before Kisuri facing surface is 4 claims 1, characterized in that it comprises a sliding layer formed into a thin film by zirconia The paper sheet identification device according to any one of the above. 6. The core body constituting the paper sheet identification sensor and the sliding layer formed on the sliding contact surface are integrally formed by insert molding using a resin material. Paper sheet identification device.

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