Magnetic line sensor, paper sheet identification device, and paper sheet processing device

Abstract

To provide a magnetic line sensor, a paper sheet identification device, and a paper sheet processing device capable of suppressing noise caused by external vibrations of the magnetic line sensor at low cost.SOLUTION: A multi-channel magnetic line sensor for detecting magnetic information of conveyed paper sheets includes: a plurality of magnetic sensing elements arranged in the main scanning direction, one for each channel; a plurality of chip-type ceramic capacitors electrically connected to each of the plurality of magnetic sensing elements, each having a pair of external electrodes; and a substrate on which the plurality of chip-type ceramic capacitors are mounted. At least one of the plurality of chip-type ceramic capacitors is arranged such that the pair of external electrodes are aligned in a direction perpendicular to the main scanning direction.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a magnetic line sensor, a paper sheet recognition device, and a paper sheet processing device. [Background technology]

[0002] In a paper sheet recognition device that recognizes paper sheets such as banknotes, characteristics of the paper sheets are acquired using various multi-channel sensors such as optical line sensors, magnetic line sensors, thickness detection sensors, etc. Then, based on the acquired characteristics of the paper sheets, it is common to recognize (determine) the type (denomination), authenticity, fitness, etc. of the paper sheets.

[0003] A multi-channel magnetic line sensor typically has multiple magnetic sensing elements arranged in the main scanning direction, along with a processing circuit that processes the output signals of each magnetic sensing element, and this processing circuit often uses passive elements such as chip-type ceramic capacitors.

[0004] Patent Document 1 discloses a capacitor assembly of a surface-mountable, relatively low-noise multilayer ceramic capacitor (MLCC). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2016-012722 Summary of the Invention [Problem to be solved by the invention]

[0006] In a conventional multi-channel magnetic line sensor, a plurality of magnetic sensing elements are provided for each channel, and the outputs of these magnetic sensing elements are added together to obtain an output signal for each channel.

[0007] However, in this case, it is difficult to improve the resolution of the magnetic line sensor in the main scanning direction due to restrictions on the number of magnetic sensing elements that can be arranged in the main scanning direction of the magnetic line sensor.

[0008] On the other hand, a method can be considered in which one magnetic sensing element is provided for each channel and the output of that magnetic sensing element is used as the output signal for that channel. With this method, more channels can be provided, which makes it possible to achieve a correspondingly higher resolution in the main scanning direction.

[0009] However, with this method, the output from the magnetic sensing elements in each channel becomes smaller, and it has become clear that noise, which was not apparent in conventional multi-channel magnetic line sensors, becomes a new issue.

[0010] More specifically, noise sometimes occurred in the output signal of the magnetic line sensor when the medium entered the thickness detection sensor and when the medium left the thickness detection sensor. After detailed investigation into the cause of this, the inventors concluded that the vibrations of the thickness detection sensor were transmitted to the magnetic line sensor, causing the magnetic line sensor board to vibrate, resulting in a piezoelectric effect in the chip-type ceramic capacitor mounted on the board.

[0011] Patent Document 1 describes a technology that reduces vibrations transmitted to the multilayer ceramic capacitor by reducing contact between the multilayer ceramic capacitor and the substrate, thereby reducing noise. However, implementing such noise countermeasures on the capacitors themselves, which require a large number of components, increases the cost of the magnetic line sensor.

[0012] The present disclosure has been made in consideration of the above-mentioned current situation, and aims to provide a magnetic line sensor, a paper sheet identification device, and a paper sheet processing device that can suppress noise caused by vibrations from outside the magnetic line sensor at low cost. [Means for solving the problem]

[0013] In order to solve the above-mentioned problems and achieve the object, (1) the magnetic line sensor according to the first aspect of the present disclosure is a multi-channel magnetic line sensor that detects magnetic information on paper sheets being transported, and includes a plurality of magnetic sensing elements, one for each channel, arranged in the main scanning direction, a plurality of chip-type ceramic capacitors electrically connected to the plurality of magnetic sensing elements and each having a pair of external electrodes, and a substrate on which the plurality of chip-type ceramic capacitors are mounted, and at least one of the plurality of chip-type ceramic capacitors is arranged so that the pair of external electrodes is aligned in a direction perpendicular to the main scanning direction.

[0014] (2) In the magnetic line sensor described in (1) above, the substrate may have a longitudinal direction oriented in the main scanning direction.

[0015] (3) The magnetic line sensor described in (1) or (2) above may further include a plurality of first amplifier circuits electrically connected to the plurality of magnetic sensing elements, respectively, and amplifying the output signals of the plurality of magnetic sensing elements, and a plurality of second amplifier circuits electrically connected to the plurality of first amplifier circuits via the plurality of chip-type ceramic capacitors, respectively, and amplifying the output signals of the plurality of first amplifier circuits.

[0016] (4) In the magnetic line sensor described in any one of (1) to (3) above, a frame to which the substrate is attached by a fixing means may be further provided, and the substrate may be provided with a through hole into which the fixing means is inserted, and of the plurality of chip-type ceramic capacitors, the chip-type ceramic capacitor closest to the through hole may be arranged so that the pair of external electrodes are aligned in a direction perpendicular to the main scanning direction.

[0017] (5) In the magnetic line sensor described in any one of (1) to (4) above, all of the plurality of chip-type ceramic capacitors may be arranged so that the pair of external electrodes are aligned in a direction perpendicular to the main scanning direction.

[0018] (6) Furthermore, a paper sheet recognition device according to a second aspect of the present disclosure includes the magnetic line sensor according to any one of (1) to (5) above, and a thickness detection sensor arranged adjacent to the magnetic line sensor.

[0019] (7) A paper sheet processing apparatus according to a third aspect of the present disclosure includes the paper sheet recognition device described in (6) above. [Effects of the Invention]

[0020] According to the present disclosure, it is possible to provide a magnetic line sensor, a paper sheet recognition device, and a paper sheet processing device that can suppress noise caused by vibrations from outside the magnetic line sensor at low cost. [Brief explanation of the drawings]

[0021] [Figure 1] 1 is a schematic perspective view showing an example of a magnetic line sensor according to a first embodiment. [Figure 2] 1 is a schematic perspective view showing an example of a chip-type ceramic capacitor according to Embodiment 1. FIG. [Figure 3] 1 is a plan view schematically illustrating an example of a substrate according to Embodiment 1. FIG. [Figure 4] 3A to 3C are schematic diagrams for explaining the principle of noise suppression in the magnetic line sensor according to the first embodiment. [Figure 5] 1 is a circuit block diagram showing an example of an electric circuit of a magnetic line sensor according to a first embodiment. [Figure 6] 1A and 1B are schematic diagrams illustrating the configuration of a paper sheet recognition device according to a first embodiment, in which (a) is a cross-sectional view and (b) is a plan view. [Figure 7] 10(a) is a perspective view showing the appearance of a paper sheet processing apparatus according to a second embodiment, and FIG. 10(b) is a cross-sectional view showing the internal structure of the paper sheet processing apparatus according to the second embodiment. [Figure 8] 10A and 10B are schematic diagrams illustrating the configuration of a paper sheet recognition device according to a second embodiment, where FIG. 10A is a cross-sectional view and FIG. [Figure 9] 10 is an exploded perspective schematic view showing an example of a magnetic line sensor according to a second embodiment. FIG. [Figure 10] FIG. 10 is a plan view schematically illustrating an example of an amplifier substrate according to a second embodiment. [Figure 11] 10 is a circuit diagram showing the first half of an example of an electric circuit of an amplifier board according to a second embodiment. FIG. [Figure 12] 10 is a circuit diagram showing the second half of an example of an electric circuit of an amplifier board according to a second embodiment. FIG. [Figure 13] 10 shows an example of a measurement result of an output waveform of a magnetic line sensor according to a first comparative example. [Figure 14] 10 shows an example of a measurement result of an output waveform of a magnetic line sensor according to the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0022] Hereinafter, with reference to the drawings, embodiments of a magnetic line sensor, a paper sheet recognition device, and a paper sheet processing device according to the present disclosure will be described in detail. Although various types of paper sheets, such as banknotes, checks, gift certificates, promissory notes, forms, securities, and card-like media, are applicable to the present disclosure, the following description will be given using an example of a device and method for banknotes. The following description is an example of a magnetic line sensor, a paper sheet recognition device, and a paper sheet processing device.

[0023] In the following description, the same reference numerals are used for components having the same or similar functions in different embodiments and drawings, and repeated explanations of the components are omitted. In addition, the drawings explaining the structure show an XYZ coordinate system that is orthogonal to one another, where the X-axis, Y-axis, and Z-axis directions correspond to the sub-scanning direction, main-scanning direction, and height direction (depth direction) of a line sensor, for example, a magnetic line sensor, respectively.

[0024] (Embodiment 1) First, a description will be given of a magnetic line sensor according to embodiment 1. Fig. 1 is a schematic perspective view showing an example of a magnetic line sensor according to embodiment 1.

[0025] In FIG. 1, the magnetic line sensor is shown upside down for visibility, but the orientation of the magnetic line sensor according to the present disclosure is not particularly limited and can be set as appropriate.

[0026] 1, the magnetic line sensor 1 according to this embodiment is a multi-channel magnetic line sensor that detects magnetic information on conveyed banknotes BN. The magnetic line sensor 1 may detect magnetic information on conveyed banknotes BN in each of a plurality of detection areas 2 that are equally divided in the main scanning direction Y of the magnetic line sensor 1. The detection areas 2 may be provided in the same number as the channels of the magnetic line sensor 1, from one side to the other of the conveyance path 61 of the paper sheet recognition device along which the banknotes BN are conveyed.

[0027] The banknote BN to be detected may be transported along the transport path 61 in the sub-scanning direction X of the magnetic line sensor 1 within the XY plane.

[0028] The magnetic line sensor 1 includes a plurality of magnetic sensing elements 3, a plurality of chip-type ceramic capacitors 10, and a substrate 20. Hereinafter, the chip-type ceramic capacitor may be abbreviated to simply "capacitor."

[0029] The multiple magnetic sensing elements 3 are provided one for each channel. In other words, there is a one-to-one correspondence between the number of output channels of the magnetic line sensor 1 and the number of magnetic sensing elements 3. This makes it possible to improve the resolution in the main scanning direction Y. For example, it is possible to triple the resolution in the main scanning direction Y compared to a system in which three magnetic sensing elements are provided for each channel.

[0030] The multiple magnetic sensitive elements 3 are arranged in the main scanning direction Y. The multiple magnetic sensitive elements 3 may be arranged in a straight line as shown in Fig. 1. However, the multiple magnetic sensitive elements 3 do not necessarily have to be arranged in a strict straight line in the main scanning direction Y, and may be slightly misaligned in the sub-scanning direction X as long as they are arranged along an axis parallel to the main scanning direction Y.

[0031] The type of each magnetic sensing element 3 is not particularly limited, and examples thereof include magnetic sensing elements that output changes in the magnetic flux density of a magnetic body as voltage fluctuations. Examples of such magnetic sensing elements include magnetoresistive elements (MR elements). Each magnetic sensing element 3 may output the strength (absolute value) of the magnetic flux density of a magnetic body, and may be, for example, a Hall element. The type of magnetic sensing element (MR element) may be an anisotropic magnetoresistive element (AMR element), a giant magnetoresistive element (GMR element), a tunneling magnetoresistive element (TMR element), or the like.

[0032] Each magnetic sensing element 3 may be of a differential output type that detects the edge of a magnetic material, or of a level output type that detects the entire area of ​​a magnetic material.

[0033] The plurality of chip-type ceramic capacitors 10 are electrically connected to the plurality of magnetic sensing elements 3, respectively. The plurality of capacitors 10 may be provided one for each magnetic sensing element 3. In other words, the number of capacitors 10 may correspond one-to-one to the number of magnetic sensing elements 3.

[0034] The plurality of capacitors 10 may be arranged in the main scanning direction Y, or may be arranged in a straight line as shown in Fig. 1. However, the location of the capacitors 10 is not particularly limited and can be set as appropriate.

[0035] Each chip-type ceramic capacitor 10 may be a surface-mount multilayer ceramic capacitor. Each capacitor 10 may also function as a capacitor for a filter such as a high-pass filter.

[0036] FIG. 2 is a schematic perspective view showing an example of the chip-type ceramic capacitor according to the first embodiment.

[0037] As shown in FIG. 2, each chip-type ceramic capacitor 10 has a pair of external electrodes 11. Each capacitor 10 may also have a ceramic body 12 having a substantially rectangular parallelepiped outer shape. The ceramic body 12 may have a first main surface 12a and a second main surface 12b facing each other in the height direction, a first side surface 12c and a second side surface 12d facing each other in the width direction, and a first end surface 12e and a second end surface 12f facing each other in the length direction. Each capacitor 10 may be mounted on the substrate 20 such that the first main surface 12a faces the substrate 20. That is, the first main surface 12a of each capacitor 10 may be the mounting surface.

[0038] The pair of external electrodes 11 may be provided at opposing positions in the longitudinal direction of the capacitor 10, and may be provided on the first end face 12e and the second end face 12f of the ceramic body 12, respectively. Each external electrode 11 may be provided so as to extend from the first end face 12e or the second end face 12f to a portion of each of the first main face 12a, the second main face 12b, the first side face 12c, and the second side face 12d. Furthermore, each external electrode 11 may be electrically connected to an internal electrode (not shown) exposed from the ceramic body 12 at the first end face 12e or the second end face 12f.

[0039] FIG. 3 is a plan view schematically illustrating an example of the substrate according to the first embodiment.

[0040] 3, a plurality of chip-type ceramic capacitors 10 are mounted on a substrate 20. For example, a pair of external electrodes 11 of each capacitor 10 may be electrically and mechanically connected to a pair of pads (not shown) provided on the substrate 20 by a connecting member such as solder.

[0041] The substrate 20 may be an amplifier substrate that amplifies the output signals of the magnetic sensitive elements 3, and may include an amplifier circuit connected to each of the magnetic sensitive elements 3.

[0042] 1 and 3, at least one of the plurality of chip-type ceramic capacitors 10 is arranged so that a pair of external electrodes 11 is aligned in a direction perpendicular to the main scanning direction Y. This makes it possible to suppress the generation of noise due to the vibration in the output signal from the channel corresponding to the magnetic sensing element 3 connected to this capacitor 10, even if vibration is transmitted from the outside to the magnetic line sensor 1. The reason for this will be explained using FIG. 4.

[0043] FIG. 4 is a schematic diagram for explaining the principle of noise suppression in the magnetic line sensor according to the first embodiment.

[0044] According to an investigation by the inventors, the vibrations that occur when a banknote enters and leaves the thickness detection sensor are greatest in the sub-scanning direction X of the magnetic line sensor 1. Therefore, as shown on the left side of Figure 4, if a chip-type ceramic capacitor 10 is arranged so that a pair of external electrodes 11 is aligned in a direction parallel to the main scanning direction Y, the capacitor 10 will also vibrate in response to large vibrations of the substrate 20 in the sub-scanning direction X, and deflection will likely occur between the pair of external electrodes 11. In other words, the piezoelectric effect is likely to occur.

[0045] In contrast, as shown on the right side of Figure 4, if the chip-type ceramic capacitor 10 is arranged so that the pair of external electrodes 11 are aligned in a direction perpendicular to the main scanning direction Y, the capacitor 10 is less likely to vibrate even if the substrate 20 vibrates significantly in the sub-scanning direction X, and there is almost no bending between the pair of external electrodes 11. In other words, the piezoelectric effect is less likely to occur. Therefore, it is possible to suppress noise caused by external vibrations from occurring in the output signal from the channel corresponding to the magnetic sensing element 3 connected to that capacitor 10.

[0046] Furthermore, this noise countermeasure does not require a special chip-type ceramic capacitor, such as a capacitor for suppressing acoustic noise, and can be achieved simply by changing the arrangement direction of capacitor 10, so it can be achieved at low cost.

[0047] Hereinafter, a chip-type ceramic capacitor in which a pair of external electrodes are arranged in a direction perpendicular to the main scanning direction, or arranging a chip-type ceramic capacitor in this manner, may be referred to as an orthogonally arranged capacitor or an orthogonally arranged capacitor.

[0048] 1 and 3, the substrate 20 may have its longitudinal direction oriented in the main scanning direction Y. In this case, the substrate 20 will vibrate more greatly in the sub-scanning direction X due to vibrations that occur when the medium enters the thickness detection sensor and when the medium leaves the thickness detection sensor. However, even in this case, in this embodiment, at least one capacitor 10 is arranged orthogonally, which makes it possible to very effectively suppress noise caused by vibrations in the output of that channel.

[0049] The longitudinal direction of the substrate means the longitudinal direction of the substrate.

[0050] The planar shape of the substrate 20 may be rectangular, and the long and short sides may be arranged so as to align with the main scanning direction Y and the height direction Z, respectively. The planar shape of the substrate 20 may also be a shape with a partial cutout.

[0051] 1 and 3, the substrate 20 may be provided with a plurality of screw holes 21 as through holes into which screws are inserted as fixing means, or may be attached to a frame (not shown) of the magnetic line sensor 1 with screws (not shown). That is, the substrate 20 may be fixed to the frame by fastening screws to the frame through the substrate 20. The screw holes 21 may be provided at both ends of the substrate 20 in the longitudinal direction.

[0052] There are no particular restrictions on which of the multiple chip-type ceramic capacitors 10 are orthogonally arranged, and the capacitors to be orthogonally arranged can be selected as appropriate. For example, as shown in Figure 3, among the multiple capacitors 10, capacitor 10a closest to one of the screw holes 21 may be orthogonally arranged. It has been found that simply orthogonally arranging capacitor 10a closest to screw hole 21 can suppress noise caused by external vibrations.

[0053] Of course, all of the chip-type ceramic capacitors 10 may be arranged orthogonally as shown in Fig. 3. This makes it possible to more effectively suppress the generation of noise caused by external vibrations.

[0054] The fixing means and through holes are not particularly limited to the screws and screw holes described above, and various fixing means and through holes corresponding to the fixing means may be used.

[0055] FIG. 5 is a circuit block diagram showing an example of an electric circuit of the magnetic line sensor according to the first embodiment.

[0056] As shown in FIG. 5, the magnetic line sensor 1 may include a plurality of first amplifier circuits 31 and a plurality of second amplifier circuits 32.

[0057] The plurality of first amplifier circuits 31 are electrically connected to the plurality of magnetic sensing elements 3, respectively, and amplify the output signals of the plurality of magnetic sensing elements 3. That is, a first amplifier circuit 31 is provided for each magnetic sensing element 3, and each first amplifier circuit 31 amplifies the output signal of the magnetic sensing element 3 connected thereto.

[0058] The second amplifier circuits 32 are electrically connected to the first amplifier circuits 31 via the chip-type ceramic capacitors 10, respectively, and amplify the output signals of the first amplifier circuits 31. That is, a second amplifier circuit 32 is provided for each first amplifier circuit 31, and each second amplifier circuit 32 amplifies the output signal of the first amplifier circuit 31 connected thereto.

[0059] In this way, by orthogonally arranging the chip-type ceramic capacitors 10 connected between the first-stage amplifier circuit 31 and the next-stage amplifier circuit 32, noise caused by external vibrations can be more effectively reduced.

[0060] 5, the magnetic line sensor 1 may have a third amplifier circuit 33 connected to the rear stage of the second amplifier circuit 32 via a chip-type ceramic capacitor 13. That is, the magnetic line sensor 1 may have a plurality of third amplifier circuits 33 electrically connected to a plurality of second amplifier circuits 32 via a plurality of chip-type ceramic capacitors 13, respectively.

[0061] The plurality of chip-type ceramic capacitors 13 may or may not be arranged orthogonally to each other. For example, at least one of the plurality of chip-type ceramic capacitors 13 may be arranged such that a pair of external electrodes is aligned in a direction parallel to the main scanning direction.

[0062] Furthermore, the first amplifier circuit 31, the second amplifier circuit 32, and the third amplifier circuit 33 may each include an operational amplifier (not shown).

[0063] Next, a description will be given of the paper sheet recognition device according to embodiment 1. Fig. 6 is a schematic diagram illustrating the configuration of the paper sheet recognition device according to embodiment 1, where (a) is a cross-sectional view and (b) is a plan view.

[0064] 6(a) and 6(b), the paper sheet recognition device 60 according to the first embodiment includes the above-described magnetic line sensor 1 and a thickness detection sensor 70 disposed adjacent to the magnetic line sensor 1. In this case, vibrations occurring when a banknote BN enters the thickness detection sensor 70 and when the banknote BN leaves the thickness detection sensor 70 are easily transmitted to the magnetic line sensor 1, causing the substrate of the magnetic line sensor 1 to vibrate significantly in the sub-scanning direction X. However, even in this case, at least one chip-type ceramic capacitor of the magnetic line sensor 1 is orthogonally arranged, so that noise caused by vibrations in the output of that channel can be very effectively suppressed.

[0065] 6(a) and 6(b), the paper sheet recognition device 60 may include an optical line sensor (contact image sensor) 80. The optical line sensor 80, the thickness detection sensor 70, and the magnetic line sensor 1 may be arranged in this order in the conveying direction of the banknote BN conveyed on the conveying path 61 of the paper sheet recognition device 60.

[0066] The thickness detection sensor 70 may detect the thickness of the banknote BN by detecting the amount of displacement of one of the rollers that face each other across the conveyance path 61 when the banknote BN passes through.

[0067] The optical line sensor 80 may detect optical information (image data) of the banknotes BN transported along the transport path 61.

[0068] The optical line sensor 80, thickness detection sensor 70, and magnetic line sensor 1 may be arranged in a line in the width direction of the conveyance path 61, and may be sufficiently long relative to the width of the conveyance path 61. This allows the entire surface of the banknote BN to be detected.

[0069] A bristle roller 62 may be disposed opposite the magnetic line sensor 1 across the conveyance path 61. This allows the banknote BN to be brought into close contact with the magnetic detection surface of the magnetic line sensor 1.

[0070] The paper sheet recognition device 60 may also include a transport mechanism that moves the banknotes BN within the transport path 61, a photosensor that detects the arrival or passage of the banknotes BN, and the like.

[0071] (Embodiment 2) Next, a magnetic line sensor, a paper sheet recognition device, and a paper sheet processing device according to a second embodiment will be described.

[0072] First, the configuration of the paper sheet processing apparatus according to this embodiment will be described with reference to Fig. 7. Fig. 7(a) is a perspective view showing the appearance of the paper sheet processing apparatus according to the second embodiment, and Fig. 7(b) is a cross-sectional view showing the internal structure of the paper sheet processing apparatus according to the second embodiment.

[0073] 7(a) and 7(b), the sheet processing apparatus 200 includes a hopper 210 on which a plurality of banknotes can be placed, a feeding unit 211 that feeds out the banknotes placed in the hopper 210 one by one, a transport path 212 that transports the banknotes fed from the feeding unit 211, a sheet recognition device 100 that performs a banknote recognition process, a stacking unit 213 that stacks normal banknotes recognized by the sheet recognition device 100, a rejection unit 214 that stacks abnormal banknotes that do not satisfy predetermined conditions, a display unit 215 that displays information input to the sheet processing apparatus 200, processing results, and the like, and a transport unit (not shown) that transports the banknotes one by one along the transport path 212. The transport unit includes a transport means such as a plurality of rollers and a drive device such as a motor that drives the transport means. The sheet processing device 200 is further equipped with transmissive or reflective optical sensors at the positions indicated by triangles in the figure to detect the transport state of banknotes within the device. The shape and skew state of a banknote may be estimated from the detection results of these optical sensors. By incorporating the sheet recognition device 100 into such a sheet processing device 200, it is possible to continuously process multiple banknotes placed in the hopper 210 and return banknotes determined to be counterfeit, damaged, or of uncertain authenticity to the reject unit 214 for sorting.

[0074] The paper sheet recognition device 100 performs recognition processing of banknotes BN using data (information) acquired by various sensors. The content of the recognition processing is not particularly limited, and in the case of banknotes, various functions include, for example, identifying the denomination, determining the authenticity and fitness of the banknote, obtaining information on the external shape and passing position of the banknote, and reading numbers, letters, and other symbols printed on the banknote.

[0075] Next, the configuration of the paper sheet recognition device 100 will be described with reference to Fig. 8. Fig. 8 is a schematic diagram for explaining the configuration of the paper sheet recognition device according to the second embodiment, where (a) is a cross-sectional view and (b) is a plan view.

[0076] As shown in Figures 8(a) and (b), the paper sheet recognition device 100 is made up of an upper unit and a lower unit sandwiching a conveyance path 212 along which banknotes BN are conveyed in the paper sheet processing device 200. Figure 8(b) corresponds to a plan view of the upper unit of the paper sheet recognition device 100 as seen from below. The paper sheet recognition device 100 has a configuration in which a photosensor 111 detects banknotes BN conveyed sequentially to the paper sheet recognition device 100 along a conveyance path 212 for the banknotes BN and generates a banknote detection signal for determining the timing to start detecting the banknotes BN in the paper sheet recognition device 100, an optical line sensor (contact image sensor) 120 detects optical information (image data) of the banknotes BN conveyed along the conveyance path 212, a thickness detection sensor 130 detects the thickness of the banknotes BN by detecting the amount of displacement of one of the rollers opposing each other across the conveyance path 212 when the banknotes BN pass, a magnetic line sensor 140 detects magnetic information of the banknotes BN conveyed along the conveyance path 212, and a photosensor 112 that detects the passage of the banknotes BN, all of which are arranged in a line. The optical line sensor 120, the thickness detection sensor 130, and the magnetic line sensor 140 are arranged in a line in the width direction of the conveyance path 212 and are sufficiently long relative to the width of the conveyance path 212 so as to be able to detect the entire surface of the banknotes BN. The paper sheet recognition device 100 is also provided with a transport mechanism 113 so that banknotes BN can move within the transport path 212. There are no particular limitations on the transport mechanism 113, and for example, a mechanism in which rollers, belts, etc. are driven by a drive device such as a motor is used. Furthermore, below the magnetic line sensor 140, a bristle roller 114 is arranged, the bristle roller 114 having a bristle-like material on its outer circumferential surface so that banknotes BN can be brought into close contact with the magnetic detection surface of the magnetic line sensor 140.

[0077] The magnetic line sensor 140 is arranged in a line on one side of the conveyance path 212 in the width direction of the conveyance path 212. The magnetic line sensor 140 detects magnetic information such as magnetic ink printed on the banknote BN over the entire surface of the banknote BN.

[0078] FIG. 9 is an exploded perspective schematic view showing an example of a magnetic line sensor according to the second embodiment.

[0079] The magnetic line sensor 140 is a multi-channel magnetic line sensor, and as shown in FIG. 9, includes a plurality of magnetoresistive elements (MR elements) 141 as a plurality of magnetic sensing elements, one for each channel, arranged in the main scanning direction Y, a sensor board 142 on which the plurality of magnetoresistive elements 141 are mounted, two amplifier boards 160 to which the sensor board 142 is fixed and on which a magnet 143 that generates a bias magnetic field and a plurality of chip-type ceramic capacitors 150 are respectively mounted, a plurality of FFCs (flexible flat cables) 144 that connect the sensor board 142 to the two amplifier boards 160, a sliding cover 146 on which a wear-resistant plate 145 is attached, a frame 147 to which the two amplifier boards 160 are respectively fixed with screws 148 as fixing means and to which the magnet 143 to which the sensor board 142 is fixed is fixed, and a shield plate 149 fixed to the frame 147 so as to cover these components.

[0080] The two amplifier boards 160 are arranged on both sides of the frame 147 in the sub-scanning direction X, and only one of the amplifier boards 160 is shown in FIG.

[0081] The sliding cover 146 is fixed to the frame 147 with screws so as to cover the magnetic resistance element 141 , and the banknote BN slides on the wear-resistant plate 145 while being held in close contact with the wear-resistant plate 145 by the bristle roller 114 .

[0082] A pair of screw holes 147a into which screws are inserted are provided at both ends of the frame 147 in the main scanning direction Y, and the frame is attached to the frame (not shown) of the main body of the paper sheet recognition device 100 by a pair of screws (not shown).

[0083] Each magnetoresistance element 141 is an anisotropic magnetoresistance element (AMR element), and for example, a resistance pattern whose resistance changes when a magnetic field perpendicular to the current direction is applied and a resistance pattern whose resistance does not change are connected in series between first and second input terminals. An external voltage is applied to the first input terminal, and the second input terminal is connected to ground. The connection point of these resistance patterns serves as an output terminal, and a detection signal consisting of a voltage level is output from the output terminal.

[0084] Each chip-type ceramic capacitor 150 is a surface-mount multilayer ceramic capacitor and has a pair of external electrodes 151. One capacitor 150 is connected to each magnetoresistance element 141, and the same number of capacitors 150 as the number of magnetoresistance elements 141 are mounted on the two amplifier boards 160.

[0085] FIG. 10 is a schematic plan view illustrating an example of an amplifier substrate according to the second embodiment.

[0086] 10, each amplifier board 160 has a rectangular planar shape and is arranged so that its long and short sides are aligned with the main scanning direction Y and the height direction Z, respectively. The amplifier board 160 is provided with screw holes 161a and 161b for fixing to the frame as through holes at one and the other ends in the longitudinal direction of the amplifier board 160, and also with one screw hole 161c for fixing to the frame as a through hole in the center of the amplifier board 160 in the longitudinal direction. The amplifier board 160 is also provided with a plurality of pads 162 for connecting the FFC 144.

[0087] As shown in FIG. 10, the capacitors 150 are arranged in a line parallel to the main scanning direction Y on each amplifier board 160 in an area biased toward the screw holes 161a.

[0088] In this embodiment, all of the capacitors 150, including the capacitor closest to the screw hole 161a, are arranged so that the pair of external electrodes 151 are aligned in a direction perpendicular to the main scanning direction Y. This makes it possible to suppress noise in the output signal of each channel due to vibration from the thickness detection sensor 130.

[0089] 11 and 12 are circuit diagrams showing an example of an electric circuit of the amplifier board according to the second embodiment, with FIG. 11 showing the first half and FIG. 12 showing the second half.

[0090] 11 and 12 is provided for each magnetoresistance element 141. The signal processing circuit 170 includes an input terminal 171 to which an output signal of the magnetoresistance element 141 is input, a first amplifier circuit 172 connected to the input terminal 171, a second amplifier circuit 174 connected to the first amplifier circuit 172 via a high-pass filter 173, a third amplifier circuit 176 connected to the second amplifier circuit 174 via a high-pass filter 175, and an output terminal 177 connected to the third amplifier circuit 176.

[0091] Here, the high-pass filter 173 is composed of the vertically arranged chip-type ceramic capacitor 150. Therefore, noise caused by external vibrations can be more effectively reduced.

[0092] In this embodiment, high-pass filter 175 is also configured with vertically arranged chip-type ceramic capacitors, but these capacitors do not have to be vertically arranged. This is because if high-pass filter 173 is configured with vertically arranged chip-type ceramic capacitors 150, it is possible to sufficiently suppress the generation of noise caused by vibrations from thickness detection sensor 130.

[0093] Here, the orientation of the chip-type ceramic capacitor was changed, and the output waveform of the magnetic line sensor incorporated into the paper sheet discriminating device together with the thickness detection sensor was measured. The results are shown in FIGS.

[0094] Fig. 13 shows an example of a measurement result of an output waveform of the magnetic line sensor according to Comparative Example 1. Fig. 14 shows an example of a measurement result of an output waveform of the magnetic line sensor according to Embodiment 2.

[0095] The magnetic line sensor of comparative form 1 has the same configuration as the magnetic line sensor of embodiment 2, except that each chip-type ceramic capacitor for the high-pass filter 173 is arranged so that a pair of external electrodes are aligned in a direction parallel to the main scanning direction.

[0096] In the magnetic line sensor according to the first comparative example, as shown in FIG. 13, noise occurs in the output waveform at the timing when the medium enters the thickness detection sensor (the period surrounded by the dashed line in the figure).

[0097] In contrast, in the magnetic line sensor of embodiment 2 in which the chip-type ceramic capacitor for the high-pass filter 173 is arranged so that a pair of external electrodes are aligned in a direction perpendicular to the main scanning direction Y, as shown in Figure 14, almost no noise was generated in the output waveform even at the timing when the medium enters the thickness detection sensor (the period surrounded by the dashed line in the figure).

[0098] As described above, in the above embodiment, at least one of the multiple chip-type ceramic capacitors electrically connected to multiple magnetic sensing elements is arranged so that its pair of external electrodes is aligned in a direction perpendicular to the main scanning direction of the magnetic line sensor, thereby making it possible to suppress, at low cost, the generation of noise in the output of the channel caused by vibrations from outside the magnetic line sensor.

[0099] In the above embodiment, a case has been described in which banknotes are transported in the short direction along the transport path within the paper sheet identification device and paper sheet processing device, but banknotes may also be transported in the long direction along the transport path within the paper sheet identification device and banknote processing device of the present disclosure.

[0100] Although the embodiments have been described above with reference to the drawings, the present disclosure is not limited to the above-described embodiments. Furthermore, the configurations of the respective embodiments may be appropriately combined or modified without departing from the spirit and scope of the present disclosure. [Industrial Applicability]

[0101] As described above, the present disclosure provides a technique useful for suppressing noise caused by vibrations from outside a magnetic line sensor. [Explanation of symbols]

[0102] 1, 140: Magnetic line sensor 2: Detection area 3: Magnetic sensing element 10, 10a, 13, 150: Chip type ceramic capacitors 11, 151: a pair of external electrodes 12: Ceramic body 12a: First main surface 12b: First main surface 12c: 1st side 12d: 1st side 12e: First end surface 12f: 1st end surface 20: Circuit board 21, 147a, 161a, 161b, 161c: screw holes 31, 172: First amplifier circuit 32, 174: Second amplifier circuit 33, 176: Third amplifier circuit 60, 100: Paper sheet identification device 61, 212: Transport path 62, 114: Hair roller 70, 130: Thickness detection sensor 80, 120: Optical line sensor 111, 112: Photo sensors 113:Transport mechanism 141: Magnetoresistance element 142: Sensor board 143: Magnet 144:FFC 145: Wear-resistant plate 146: Sliding cover 147: Frame 148: Bis 149: Shield plate 160: Amplifier board 162: Pad 170: Signal processing circuit 171: Input terminal 173, 175: High-pass filter 177: Output terminal 200: Paper processing equipment 210: Hopper 211: Feeding section 213: Accumulation section 214: Rejection section 215: Display section BN:Banknote

Claims

1. A multi-channel magnetic line sensor that detects magnetic information on conveyed paper sheets, a plurality of magnetic sensing elements, each of which is provided for each channel and arranged in the main scanning direction; a plurality of chip-type ceramic capacitors each having a pair of external electrodes, the chip-type ceramic capacitors being electrically connected to the plurality of magnetic sensing elements; a substrate on which the plurality of chip-type ceramic capacitors are mounted, At least one of the plurality of chip-type ceramic capacitors is arranged so that the pair of external electrodes is aligned in a direction perpendicular to the main scanning direction. A magnetic line sensor characterized by:

2. The substrate has a longitudinal direction oriented in the main scanning direction.

2. The magnetic line sensor according to claim 1.

3. a plurality of first amplifier circuits electrically connected to the plurality of magnetic sensing elements, respectively, for amplifying output signals from the plurality of magnetic sensing elements; a plurality of second amplifier circuits electrically connected to the plurality of first amplifier circuits via the plurality of chip-type ceramic capacitors, respectively, and amplifying output signals of the plurality of first amplifier circuits, respectively.

3. The magnetic line sensor according to claim 1, wherein the magnetic line sensor is a magnetic sensor.

4. a frame to which the substrate is attached by a fixing means; the substrate is provided with a through hole into which the fixing means is inserted; Among the plurality of chip-type ceramic capacitors, the chip-type ceramic capacitor closest to the through hole is arranged so that the pair of external electrodes are aligned in a direction perpendicular to the main scanning direction.

3. The magnetic line sensor according to claim 1, wherein the magnetic line sensor is a magnetic sensor.

5. All of the plurality of chip-type ceramic capacitors are arranged so that the pair of external electrodes are aligned in a direction perpendicular to the main scanning direction.

3. The magnetic line sensor according to claim 1, wherein the magnetic line sensor is a magnetic sensor.

6. The magnetic line sensor according to claim 1 or 2; a thickness detection sensor disposed adjacent to the magnetic line sensor; A paper sheet identification device characterized by:

7. A paper sheet recognition device according to claim 6 is provided. A paper sheet processing apparatus characterized by:

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