WO2006129716A1 - Magnetic charge sensor, magnetic charge sensor device, and device for identifying sheet - Google Patents

Abstract

A magnetic charge sensor which can infallibly detect a fine magnetic pattern such as a thread in a sheet even when a plurality of sensors are arranged linearly in the sheet conveying direction. A magnetic charge sensor device and a device for identifying a sheet by using the magnetic charge sensor are also provided. The magnetic charge sensor device (5) comprises magnetic charge sensors (10) each of which is composed of a core body (11) having a sensor surface (110) where air gaps (16) are opened and exciting coils (12) arranged in the air gaps (16). The magnetic charge sensors (10) detect the magnetic pattern of a sheet (2) while moving relatively to the sheet (2). The core bodies (11) are arranged linearly and independently of each other in the direction W’ crossing the moving direction W of the sheet (2), and the exciting coils (12) are arranged in the air gaps (16) in each of the core bodies (11).

Description

 Specification

 Technical Field of Magnetic Quantity Detection Sensor, Magnetic Quantity Detection Sensor Device, and Paper Sheet Identification Device

 [0001] The present invention relates to a magnetic quantity detection sensor, a magnetic quantity detection sensor device, and a paper sheet identification device for identifying the authenticity and type of paper sheets such as banknotes, checks and other securities. is there.

 Background art

 [0002] Conventionally, in a discriminating device such as a bill, a method has been adopted in which a pattern printed on a bill with magnetic ink is detected by an MR sensor (magnetoresistance sensor) or the like to identify the authenticity and type of the bill ( For example, see Patent Document 1).

 [0003] In addition to such a system, an identification device using any sensor generally has a plurality of sensors for reasons such as preventing the wiring of each sensor from interfering with adjacent sensors. Are arranged in a direction that intersects the bill conveyance direction with an interval of about 4 mm, and the sensor device is configured, and the output pattern from each sensor is verified. In this case, when it sees from the conveyance direction of a banknote, the one where the space | interval of sensors is narrow can perform a leak-free detection. For example, depending on the type of banknote, a fine line with a width of S 1 mm or less, called a thread extending in the banknote transport direction, may be formed with magnetic ink printing or wire. If the distance between the sensors is wide, the thread will pass between the sensors, and it will not be possible to detect the presence of a line (slet). Therefore, a structure in which the distance between the sensors is substantially narrowed by arranging the sensors in a so-called staggered pattern may be adopted.

 Patent Document 1: JP 2001-92915 A

 Disclosure of the invention

 Problems to be solved by the invention

[0004] However, if the sensors are arranged in a staggered manner, the bills are likely to be caught on the sensor, so it is necessary to run the paper with the sensor force buoyant, and the detection sensitivity cannot be increased. There is. In addition, when a bill is transported while being pressed against a sensor by a roller whose axis extends in a direction perpendicular to the bill transport direction, if the sensor is in a staggered arrangement, the bill will be displaced in the bill transport direction. Since the sensor is located, there is also a problem that the bill cannot be pressed evenly against each sensor with a roller.

 [0005] In view of the above problems, an object of the present invention is to ensure that a fine magnetic pattern such as a paper sheet threat is reliably obtained even when a plurality of sensors are linearly arranged in the direction of paper sheet conveyance. It is an object of the present invention to provide a magnetic quantity detection sensor capable of detection, a magnetic quantity detection sensor device, and a paper sheet identification device using the magnetic quantity detection sensor device.

 Means for solving the problem

 [0006] In order to solve the above problems, a magnetic quantity detection sensor device according to the present invention includes a core body having a sensor surface that opens a gap, and an excitation coil disposed in the gap. A magnetic quantity detection sensor that detects a magnetic pattern of the paper sheet by moving relative to the paper sheet, and a plurality of the core bodies are each independently linear in a direction intersecting the moving direction of the paper sheet. The exciting coil is disposed in the gap of each of the plurality of core bodies.

 In the magnetic quantity detection sensor device according to the present invention, information can be detected from a portion corresponding to a plurality of core bodies even if the core bodies are linearly arranged independently of each other. Therefore, a magnetic pattern, that is, a thread extending in the transport direction (a thin line with a width of 1 mm or less), which is printed with magnetic ink, has a magnetic force even when it passes between adjacent cores. Therefore, the presence of the threat and its pattern can be detected accurately.

 [0008] The core body according to the present invention includes a horizontal plate portion that is horizontal to the sensor surface, and a center and both end portions of the horizontal plate portion that are perpendicular to the sensor surface in the conveyance direction of the paper sheet. And the exciting coil is disposed in the gap so as to surround the central vertical plate portion of the three vertical plate portions. Like ま

In the present invention, it is preferable that the interval between the adjacent core bodies is 0.05 mm force and 2.5 mm.

[0010] In the present invention, the opening width dimension of the gap in the moving direction of the paper sheet is 0.3. Preferably from mm to 5. Omm.

 [0011] The magnetic quantity detection sensor according to the present invention includes a core body having a sensor surface in which a gap is opened, and an excitation coil arranged in the gap, and moves relative to the paper sheet and moves the paper sheet. In a magnetic quantity detection sensor for detecting a magnetic pattern of the same kind, the size of the opening width of the gap in the moving direction of the paper sheet is 0.3 mm to 5. Omm. In this case, the core body includes a horizontal plate portion that is horizontal to the sensor surface, and center and both end forces in the conveyance direction of the paper sheet in the horizontal plate portion that extend perpendicular to the sensor surface. Preferably, the exciting coil is arranged so as to surround a central vertical plate portion of the three vertical plate portions.

 [0012] In the paper sheet identification apparatus provided with the magnetic quantity detection sensor device to which the present invention is applied, the magnetic quantity detection sensor is arranged with the sensor surface facing the conveyance path through which the paper sheet is conveyed, An alternating current is supplied to the excitation coil, and the paper sheet is identified based on a detection result of a magnetic field change when the paper sheet is transported through the transport path.

 [0013] In the present invention, the core body has a magnetic sensing portion protruding toward the paper sheet, and the excitation coil is disposed so as to surround the magnetic sensing portion, It is preferable that the sensor surface is an end surface side of the magnetic sensing part surrounded by the exciting coil. The invention's effect

 [0014] In the magnetic quantity detection sensor device according to the present invention, even if the core bodies are linearly arranged independently of each other, information can also be detected from partial forces corresponding to each other between adjacent core bodies. Therefore, for example, even when a magnetic pattern, that is, a printed wire made of magnetic ink, called a thread (thin line having a width of 1 mm or less) extending in the transport direction, passes between adjacent core bodies, Since a magnetic field is generated, the presence of a threat and its pattern can be detected accurately. Brief Description of Drawings

FIG. 1 is a configuration diagram showing a main configuration of a paper sheet identification apparatus to which the present invention is applied.

 [FIG. 2] (a) and (b) are explanatory diagrams of a self-excited magnetic quantity detection sensor used in a paper sheet identification device to which the present invention is applied, and driving when this magnetic quantity detection sensor is used. It is explanatory drawing of a circuit.

[FIG. 3] (a), (b), (c), and (d) are cores used in a magnetic quantity detection sensor device to which the present invention is applied. In this magnetic quantity detection sensor device, a test piece on which a test pattern having a width of about 1 mm is formed in the sheet conveyance direction is perpendicular to the sheet conveyance direction. FIG. 5 is an explanatory diagram showing a signal waveform output from one magnetic quantity detection sensor when moved to.

 [FIG. 4] In the magnetic quantity detection sensor device shown in FIGS. 3 (a) to 3 (c), the width between adjacent core bodies is set to 1.5 mm, and the width is about lmm in the sheet transport direction. When the test pattern on which the test pattern is formed is moved in the direction perpendicular to the paper transport direction, the waveforms of the signals output from the two magnetic quantity detection sensors, and when these signals are combined It is explanatory drawing which shows these waveforms.

 [FIG. 5] (a), (b), (c), and (d) are a perspective view, a side view, a front view, and a magnetic field of the core used in the magnetic quantity detection sensor device according to the comparative example of the present invention. In a quantity detection sensor device, when a test piece on which a test pattern with a width of about 1 mm is formed in the paper conveyance direction is moved in a direction perpendicular to the paper conveyance direction, one magnetic quantity detection sensor It is explanatory drawing which shows the signal waveform output.

 [Fig. 6] The magnetic quantity detection sensor device shown in Figs. 3 (a) to 3 (c) is formed with a test pattern having a width of about lmm in the interval between adjacent core bodies and in the sheet conveyance direction. FIG. 6 is an explanatory diagram showing the relationship between the level of the sum of the signals output from each of the two magnetic quantity detection sensors when the test piece is moved in a direction orthogonal to the sheet conveyance direction.

[Fig. 7] (a) and (b) show the respective magnetic fields when the gap between the sensor surface and the paper sheet is changed in the magnetic quantity detection sensor device shown in Figs. 3 (a) to (c). FIG. 6 is a graph showing a change in signal level at which the amount detection sensor force is also output, and a graph showing a change in signal level output from each magnetic quantity detection sensor when the opening width dimension of the air gap in the core body is changed.

[FIG. 8] (a) and (b) are explanatory diagrams showing an example of a paper sheet placed on the paper sheet identification device to which the present invention is applied, and an explanation showing a sensor output when the paper sheet is placed. FIG. Explanation of symbols

1 Paper sheet identification device

2 Paper sheets (paper sheets) 3 Transport path

 5 Magnetic quantity detection sensor device

 10 Magnetic quantity detection sensor

 11 core body

 12 Excitation coil for pattern detection

 15 Coil for differential detection

 16, 17 Air gap

 110 Sensor surface

 BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, with reference to the drawings, a magnetic quantity detection sensor, a magnetic quantity detection sensor device to which the present invention is applied, and a paper sheet identification device using the magnetic quantity detection sensor device will be described.

[0018] [Embodiment 1]

 (overall structure)

 FIG. 1 is a configuration diagram showing a main configuration of a paper sheet identification device to which the present invention is applied. In FIG. 1, the paper sheet identification device 1 of the present embodiment detects a pattern formed on the paper surface of a paper sheet 2 (paper sheet) such as a banknote or a check, and identifies its authenticity and type. This is an apparatus, and a printed pattern 21 made of a magnetic material such as magnetic ink is formed on the paper sheet 2. Further, a thin line called a thread 20 extending in the conveying direction of the paper sheet 2 and having a width of 1 mm or less is formed on the paper sheet 2 by printing with magnetic ink or a wire. Furthermore, on the paper sheet 2, a hologram pattern 22 made of a nonmagnetic conductive material such as aluminum is formed.

The paper sheet identification device 1 of the present embodiment includes a transport mechanism (not shown) that transports the paper sheet 2 along the transport path 3, and a magnetic quantity detection sensor device 5 that is disposed in the middle of the transport path 3. A power supply circuit (not shown) for supplying an alternating current to each of the plurality of magnetic quantity detection sensors 10 constituting the magnetic quantity detection sensor device 5, and a detection circuit for processing outputs from the plurality of magnetic quantity detection sensors 10 ( (Not shown) etc.

The conveying means includes, for example, a plurality of rollers that press the paper sheet 2 against the magnetic quantity detection sensor 10, a drive source that drives these rollers, a transmission means that transmits the driving force to the rollers, and the like. Since these are known techniques, description and illustration are omitted here.

 Here, the plurality of magnetic quantity detection sensors 10 are directed in the width direction of the conveyance path 3 (direction intersecting the conveyance direction of the paper sheet 2) in a state where the sensor surface 110 faces the conveyance path 3. Independently arranged linearly, when the paper sheet 2 is conveyed, the magnetic pattern of the part passing through the lower position is detected in time series. Note that the conveyance direction of the paper sheet 2 is indicated by an arrow W.

 [0020] (Configuration of magnetic quantity detection sensor device)

 2 (a) and 2 (b) are explanatory diagrams of a self-excited magnetic quantity detection sensor used in the magnetic quantity detection sensor device of the paper sheet identification apparatus to which the present invention is applied, and the magnetic quantity detection sensor. It is explanatory drawing of a drive circuit when it is used.

 In the magnetic quantity detection sensor device 5 of the paper sheet identification device 1 to which the present invention is applied, for example, FIG.

 A plurality of self-excited magnetic quantity detection sensors 10 shown in (a) are mounted. The magnetic quantity detection sensor 10 includes a core body 11 having a sensor surface 110 in which the air gap 16 is opened, and an excitation coil 12 for pattern detection disposed in the air gap 16. More specifically, in the present embodiment, the core body 11 extends from the horizontal plate portion 111 and its center, one end portion, and the other end portion toward the transport path 3 and the opposite side. A total of six vertical plate portions 112, 113, 114, 115, 116, 117 are provided, and the sensor surface 110 is formed by the lower end surfaces of the vertical plate rods 112, 113, 114!

 Although it is specified as “horizontal plate part” and “vertical plate part”, it indicates a relative relationship strictly not intended to be horizontal or vertical with respect to the sensor surface 110. .

 In the present embodiment, the core body 11 is arranged such that the long sides of the vertical plate portions 112, 113, 114 are in a direction W ′ that intersects the conveyance direction W of the paper sheet 2. By arranging in this way, the thin line formed on the paper sheet 2 and the area facing the thread 20 are widened, and the detection accuracy can be increased. In other words, even if the paper sheet 2 moves in the direction W ′ intersecting the conveyance direction W during conveyance, the threat 20 is conveyed in the cross-sectional area of the vertical plate portions 112, 113, 114, so the SZN ratio is high. It can be detected in the area.

Furthermore, by making the vertical plate portions 112, 113, 114 into a simple plate shape, the processing of the core body 11 is facilitated. [0023] In the present embodiment, the vertical plate portions 112, 113, 114 each constitute a magnetic sensitive portion projecting from the paper sheet 2 by force, and as shown in FIG. 2 (a), the vertical plate portions In 112, an excitation coil 12 for pattern detection is arranged in the gap 16 so as to surround it. Further, a horizontal plate portion 111 is configured as a connecting portion that connects one end portions of the vertical plate portions 112, 113, and 114.

 In the core body 11, a gap 16 that opens at the sensor surface 110 is formed between the vertical plate portions 112 and 113 and between the vertical plate portions 112 and 114. An excitation coil 12 for pattern detection that also has a voice coil force is arranged so as to wind the plate portion 112. In the present embodiment, as shown in FIG. 2 (a), the excitation coil 12 for pattern detection is wound around the vertical plate portion 112 a predetermined number of times!

 In the present embodiment, the core body 11 has a gap 17 that opens between the vertical plate portions 115 and 116 and between the vertical plate portions 115 and 117 on the side opposite to the sensor surface 110. In this gap 17, a differential detection coil 15 having a voice coil force is disposed so as to wind the vertical plate portion 115 a predetermined number of times. Here, in the present embodiment, signal detection is performed by a differential detection method. Specifically, the non-turn detecting excitation coil 12 and the differential detecting coil 15 are connected in series, supplied to an alternating current at both ends, and the pattern detecting exciting coil 12 and the differential coil 15 are differentially connected. A signal is output from the connection point with the coil 15 for detection!

 [0026] When signal detection is performed by the differential detection method using such a magnetic quantity detection sensor 10, a drive circuit shown in FIG. 2 (b) is used. The drive circuit includes a common power supply circuit 40 for supplying an alternating current to the excitation coil 12 for detecting each pattern of the plurality of magnetic quantity detection sensors 10 and the coil 15 for each differential detection, and each magnetic quantity detection sensor. And a plurality of sensor signal processing circuits 30 corresponding to 10.

The sensor signal processing circuit 30 is composed of a differential amplifier 31, a rectifier circuit 32 such as a half-wave rectifier circuit or a full-wave rectifier circuit, a low-pass filter 33, an amplifier amplifier 34, etc., and outputs from each magnetic quantity detection sensor 10. The signal is amplified. Further, the authenticity and type of the paper sheet 2 are identified by collating the output canoturns output from the sensor signal processing circuits 30. According to such a differential detection method, environmental changes such as temperature are changed. The paper sheet 2 can be identified with high accuracy because the influence of the conversion can be offset.

 [0027] (Detailed configuration of magnetic quantity detection sensor device)

 3A, 3B, and 3C are a perspective view, a side view, and a front view of a core body used in a magnetic quantity detection sensor device to which the present invention is applied.

 [0028] As shown in Figs. 3 (a), (b), and (c), in the magnetic quantity detection sensor device 5 and the paper sheet identification device 1 of the present embodiment, the core body 11 of the magnetic quantity detection sensor 10 includes: A plurality of paper sheets 2 are arranged independently and linearly in a direction W ′ (in the present embodiment, a direction orthogonal to each other) that intersects the conveyance direction W of the paper sheet 2 and is used for pattern detection in the gaps 16 of the core bodies 11. The excitation coil 12 (see Fig. 2 (a)) is placed.

 Here, as shown in FIG. 3, the plurality of magnetic quantity detection sensors 10 are linearly arranged with a predetermined interval, independently of each other. Thus, the interval a between the adjacent core bodies 11 is set to 0.05 mm from 0.05 mm force for the reason described later.

 [0030] In addition, the opening width dimension b of the gap 16 of the core body 11 in the direction W 'perpendicular to the conveyance direction W of the paper sheet 2 is set to 0.3 mm to 5. Omm for the reason described later.

 [0031] (Effect 1 of this embodiment)

 First, in the magnetic quantity detection sensor device 5 according to the present embodiment, as shown in FIGS. Since each is independently and linearly arranged, there is an advantage that banknotes are not easily caught on the core body 11 as compared with the case where the core bodies 11 are staggered as in the prior art. Further, since the core body 11 is linearly arranged in the direction W ′ intersecting with the conveyance direction W of the paper sheet 2, a roller whose axis extends in the direction W ′ perpendicular to the conveyance direction W of the paper sheet 2 (see FIG. When the paper sheet 2 is conveyed while being pressed against the core body 11 by using a roller (not shown), the paper sheet 2 can be evenly pressed against each core body 11 by using a roller (not shown). .

 [0032] (Effect 2 of this embodiment)

 Effect 2 of the present invention will be described with reference to FIGS. 3 (d), 4 and 5 (a) to (d), 6 and 7.

[0033] FIG. 3 (d) shows an example of the magnetic quantity detection sensor device 5 shown in FIGS. 3 (a) to 3 (c). As shown in FIG. lmm test pattern 20 '(magnetic pattern FIG. 6 is an explanatory diagram showing a signal waveform output from one magnetic quantity detection sensor 10 when the test piece 2 ′ formed with () is moved in a direction W ′ perpendicular to the conveyance direction W of the paper sheet 2; 4 shows a state in which the distance a between adjacent core bodies 11 is set to 1.5 mm in the magnetic quantity detection sensor device 5 shown in FIGS. 3 (a) to 3 (c), as shown in FIG. 3 (a). When the test piece 2 ′ having the test pattern 20 ′ having a width of about lmm in the conveyance direction W of the paper sheet 2 is moved in the direction W perpendicular to the conveyance direction W of the paper sheet 2 FIG. 3 is an explanatory diagram showing signal waveforms output from two magnetic quantity detection sensors 10 and waveforms when these signals are combined. 5A to 5D are a perspective view, a side view, a front view, and a magnetic quantity detection sensor device 5 ′ according to the reference example of the core body 11 of the magnetic quantity detection sensor device 5 ′ according to the reference example. In Fig. 5 (a), a test piece 2 'having a test pattern 20' having a width of about lmm in the conveyance direction W of the paper sheet 2 'is defined as a conveyance direction W of the paper sheet 2'. FIG. 6 is an explanatory diagram showing a signal waveform output from one magnetic quantity detection sensor 10 ′ when moved in an orthogonal direction W ′.

 FIG. 6 shows a test pattern in the magnetic quantity detection sensor device 5 shown in FIGS. 3 (a) to 3 (c) having a width of about 1 mm in the interval a between adjacent core bodies 11 and the conveyance direction W of the paper sheet 2. The noise output from each of the two magnetic quantity detection sensors 10 is not included when the test piece 2 'formed with 20' is moved in the direction W 'perpendicular to the conveyance direction W of the paper sheet 2. It is explanatory drawing which shows the relationship with the level of the sum of a signal component.

In the magnetic quantity detection sensor device 5 according to this embodiment, the interval a between the adjacent core bodies 11 is set to 1.

 Since it is set to 5 mm, the test piece 2 ′ with the test pattern 20 ′ having a width of about 1 mm in the conveyance direction W of the paper sheet 2 is placed in the direction W ′ orthogonal to the conveyance direction W of the paper sheet 2. When moving, the magnetic quantity detection sensor 10 outputs the signal shown in FIG. 3 (d). In such an output signal, the sensitivity distribution is uniform and the signal drop due to the edge portion of the core body 11 occurs. Is small. Such a drop in signal occurs due to the concentration of magnetic flux generated by the excitation coil 12 for pattern detection at the edge portion of the core body 11. According to this embodiment, the concentration of the applied magnetic flux is reduced. Can be eased.

Also, as shown in FIG. 4, in the magnetic quantity detection sensor device 5 according to the present embodiment, the magnetic quantity through which the test pattern 20 ′ of the test piece 2 ′ passes first out of the two magnetic quantity detection sensors 10. The output of detection sensor 10 (left side of the drawing) (indicated by dotted line L11) The test pattern 20 'of the test piece 2' is 2 so that it can be divided when compared with the output (dotted line L12) of the magnetic quantity detection sensor 10 (right side of the drawing 20) that the sensor 20 'passes later. When passing between two magnetic quantity detection sensors 10, the output of the magnetic quantity detection sensor 10 through which the test pattern 20 ′ first passes (indicated by the dotted line L11) and the magnetic quantity detection through which the test pattern 20 ′ passes later The output of sensor 10 (dashed line L12) partially overlaps in section t. Therefore, the output signal waveform obtained by synthesizing the outputs from the two magnetic quantity detection sensors 10 is a signal having a waveform as shown by a solid line L13 in FIG. Therefore, according to the magnetic quantity detection sensor device 5 according to the present embodiment, even when the thread 20 shown in FIG. 1 passes between the core bodies 11, data such as the presence and length thereof can be reliably obtained. Obtainable.

 The number of turns of the excitation coil 12 for pattern detection, the diameter of the excitation coil 12 for pattern detection, or the shape of the core body 11 is appropriately set, and the interval a between adjacent core bodies 11 is set.

 On the other hand, in the magnetic quantity detection sensor device 5 ′ according to the reference example shown in FIGS. 5 (a) to 5 (c), the horizontal plate portion 111 ′ is common to the plurality of core bodies 11 ′. From this common horizontal plate portion 111 ′, a plurality of vertical plate portions 112 ′ and 115 ′ protrude for each core body 11 ′, and a pattern detection exciting coil (not shown) is provided on each vertical plate portion 112 ′. A coil for differential detection (not shown) is wound around each vertical plate 115 ′.

 In the core body 11 ′ shown in FIG. 5, each vertical plate portion 112 ′ constitutes a magnetic sensing portion, and is arranged independently and linearly.

 Further, the common horizontal plate portion 111 ′ functions as a connecting portion, and by making it common, processing and assembly can be easily performed as compared with the embodiment shown in FIG.

[0037] In the magnetic quantity detection sensor device 5 'using the core body 11' having such a configuration, as shown in Fig. 5 (a), a test pattern having a width of about lmm in the conveyance direction W of the paper sheet 2 is used. The signal output from one magnetic quantity detection sensor 10 ′ when the test piece 2 ′ formed with 20 ′ is moved in the direction W ′ perpendicular to the conveyance direction W of the sheet 2 ′ is shown in FIG. (d) has a waveform as shown in FIG. 3 (d), and the force output signal has a sensitivity distribution compared to the output signal of the magnetic quantity detection sensor device 5 ′ to which the present invention shown in FIG. 3 (d) is applied. The signal drop due to the edge portion of the core body 11 ′ is large and uneven. Based on the waveform shown in Fig. 5 (d), the interval between adjacent core bodies 11 '(vertical plate 112') is set to about 1 mm, so that the output from two adjacent magnetic quantity detection sensors 10 ' Can be overlapped. Therefore, even in the case of the magnetic quantity detection sensor device 5 ′ according to the present embodiment, even when the thread 20 shown in FIG. 1 passes between the core bodies 11 ′, data such as the presence and length thereof are reliably obtained. Obtainable.

 [0038] Here, the effect described with reference to FIG. 3 (d) and FIG. 4 is derived from the resultant force obtained when the distance a between adjacent core bodies 11 is set to 1.5 mm. In the magnetic quantity detection sensor device 5 and the paper sheet identification device 1 of the present embodiment, two forces when the distance a between adjacent core bodies 11 is changed from 0.5 mm to 4. Omm. The sum of the outputs from the magnetic quantity detection sensor 10 changes as shown in FIG. Here, the level required for the sum of the signal components not including noise from the two magnetic quantity detection sensors 10 is about 0.2 V based on the following reasoning.

 [0039] First, in the magnetic quantity detection sensor device 5 and the paper sheet identification device 1 of the present embodiment, when a banknote is conveyed by lmZs using a circuit that uses an analog amplifier, a 1 kHz resolution is obtained. A frequency response is required. If the frequency response characteristic of the analog amplifier circuit is 1 kHz to 10 kHz, a resolution of 0.1 mm to Lmm can be realized. However, if the amplifier gain is set to about 1000 times in the analog amplifier circuit, noise of 50 to 100 mV is generated. Therefore, the level required for the sum of the signal components not including noise from the two magnetic quantity detection sensors 10 is 0. If it is 2V or more, the SZN ratio is 2 or more, and the bill pattern can be detected with the above resolution. That is, if the SZN ratio is 2 or more, it is possible to detect a banknote pattern (pattern).

[0040] If the results shown in Fig. 6 are examined on the assumption that such constraints exist, the signal level (no noise is included) even if the distance a between adjacent core bodies 11 is increased to 2.5 mm. It can be said that 0.2V or more can be secured as the sum of signal components. However, if the distance a between adjacent core bodies 11 exceeds 2.5 mm, the signal level (sum of signal components not including noise) becomes less than 0.2 V, and the desired SZN ratio is obtained. Will not be able to detect the pattern of the banknote. Therefore, the distance a between the adjacent core bodies 11 is preferably 2.5 mm or less. In addition, between the adjacent core bodies 11 for pattern detection Since the exciting coil 12 passes, considering the space, it is necessary to ensure that the distance a between the adjacent core bodies 11 is 0.05 mm or more. Therefore, it is preferable that the distance a between adjacent core bodies 11 is 0.05 mm and 2.5 mm.

 [0041] (Effect 3 of this embodiment)

 7 (a) and 7 (b) show the opening width dimension b of the gap 16 in the core body 11 in the magnetic quantity detection sensor 10 of the magnetic quantity detection sensor device 5 shown in FIGS. 3 (a) to 3 (c). When changing from 5 mm to 6. Omm, the signal level output from each magnetic quantity detection sensor 10 when the gap between the sensor surface 110 and the paper sheet 2 is changed from Omm to 0.4 mm. When the gap between the sensor surface 110 and the paper sheet 2 is changed from Omm to 0.4 mm, the opening width dimension b of the gap 16 in the core body 11 is 0.5 mm or 6. 6 is a graph showing a change in signal level output from each magnetic quantity detection sensor 10 when changing to Omm. In Fig. 7 (a) and (b), the relationship between each line and each condition is as follows.

 L21 Opening width of gap 16 b = 0. omm

 L22 Opening width dimension of gap 16 b = 0.95mm

 L23 Opening width dimension of gap 16 b = 1. omm

 L24 Opening width dimension of gap 16 b = 3. Omm

 L25 Opening width of gap 16 b = 5. Omm

 L26 Opening width of gap 16 b = 6. Omm

 L31 Gap between sensor surface 110 and paper 2 = Omm (contact state)

 L32 Gap between sensor surface 110 and paper 2 = 0. Lmm

 L33 Gap between sensor surface 110 and paper 2 = 0.2mm

 L34 sensor surface 110 and paper sheet 2 gap = 0.3 mm

 L35 Gap between sensor surface 110 and paper 2 = 0.4mm

 As shown in

In FIGS. 7 (a) and 7 (b), the gap between the sensor surface 110 and the paper sheet 2 is generally 0.4 mm or less, and is usually set to about 0.1 mm. Even under such conditions, if the opening width dimension b of the gap 16 is set to 0.3 mm to 5. Omm in the core body 11, sufficient resolution can be obtained for the following reason. First, using a circuit that uses an analog amplifier, When transferring bills in lmZs, a frequency response of 1kHz is required to obtain a resolution of 1mm. If the frequency response characteristic of the analog amplifier circuit is lkHz to 10kHz, a resolution of 0.1mm can be achieved. . However, analog amplification

 When the amplifier gain is set to 1000 times on the road, noise of 50 to 100 mV is generated. Therefore, if the signal level is 0.2 V or more, the SZN ratio is 2 or more, and the pattern of the banknote can be detected with the above resolution. become. That is, if the SZN ratio is 2 or more, it is possible to suitably detect a banknote pattern. Therefore, the opening width dimension b of the gap 16 of the core body 11 in the direction W perpendicular to the conveyance direction W of the paper sheet 2 is preferably less than 5. Omm. When the opening width dimension b exceeds 5. Omm, The signal level becomes less than 0.2V, the desired SZN ratio cannot be obtained, and the banknote pattern cannot be detected. Further, since the excitation coil 12 for pattern detection is disposed in the gap 16 of the core body 11, the opening width dimension b is preferably 0.3 mm or more in consideration of the wire diameter of the coil. Therefore, the opening width dimension b of the gap 16 in the core body 11 is preferably 0.3 mm to 5. Omm.

 [0043] (Effect 4 of this embodiment)

 FIGS. 8 (a) and 8 (b) are explanatory diagrams showing an example of paper sheets placed on the paper sheet identification device to which the present invention is applied, and explanatory views showing sensor outputs when the paper sheets are placed. is there.

 Furthermore, in the paper sheet identification apparatus 1 including the magnetic quantity detection sensor 10 according to the present embodiment according to the present embodiment, as shown in FIG. 1, a holo formed of a nonmagnetic conductive material such as aluminum is used. The gram pattern 22 can also be detected. That is, as shown in FIG. 8 (a), when a paper sheet 2 having a printed pattern 21 formed with magnetic ink and a hologram pattern 22 is placed on the paper sheet 2, an arrow L appears in FIG. 8 (a). The output shown in FIG. 8 (b) is obtained from the magnetic quantity detection sensor 10 that measures the position indicated by.

In the output shown in FIG. 8 (b), first, in the period tl during which the region L1 where the print pattern 21 is formed on the paper sheet 2 passes below the magnetic quantity detection sensor 10, the print pattern 21 is used for transmission. Since the magnetic susceptibility increases, the output becomes a high level. Next, in a period t2 in which the printed pattern 21 is formed on the paper sheet 2 and the region L1 and the hologram pattern 22 are formed, and the region L2 between the region L3 passes below the magnetic quantity detection sensor 10. In the region L2, neither the print pattern 21 nor the hologram pattern 22 is formed. Therefore, the output becomes an intermediate level. In a period t3 in which the region L3 where the hologram pattern 22 is formed on the paper sheet 2 passes below the magnetic quantity detection sensor 10, an eddy current is generated in the hologram pattern 22, so the output is at a low level. Then, after the region L3 where the hologram pattern 22 is formed on the paper sheet 2 passes under the magnetic quantity detection sensor 10, the region L4 passes through the lower part of the magnetic quantity detection sensor 10 and then becomes the region L4. Since neither the print pattern 21 nor the hologram pattern 22 is formed, the output becomes an intermediate level. Therefore, according to the present embodiment, the common magnetic quantity detection sensor 10 can detect the print pattern 21 formed of a magnetic material and the hologram pattern 22 formed of a nonmagnetic conductive material. The equipment configuration can be simplified. Therefore, the paper sheet identification device 1 can be reduced in size and cost.

[Other Embodiments]

 The above-described embodiment is an example of a preferred embodiment of the present invention, but is not limited thereto, and various modifications can be made without departing from the scope of the present invention. .

 For example, in the present embodiment, in the core bodies 11 and 11 ′, the vertical plate portions 112, 112, 113, and 114 are plate-shaped forces. For example, the core bodies 11 and 11 ′ may be prisms having a square cross section. However, it may be a cylinder having a circular cross section. Furthermore, it is not limited to plate shape and column shape.

 Further, in the present embodiment, the end surfaces of the vertical plate portions 112, 112 ′, 113, 114 constituting the sensor surface 110 are on the same plane, but are not limited to this, and face each sheet 2 that is not limited thereto. The intervals may be different.

Further, in the present embodiment shown in FIG. 2, the excitation coil 12 for pattern detection is a force wound around the central vertical plate portion 112. Other vertical plates are not limited to this. It may be wound on one of the parts 113 and 114, or may be wound on a plurality of vertical plate parts.

Claims

The scope of the claims  [1] A magnetic quantity that includes a core body having a sensor surface with an opening in the gap and an excitation coil disposed in the gap, and detects a magnetic pattern of the sheet by moving relative to the sheet. A plurality of core bodies, each of which is linearly arranged independently in a direction intersecting the moving direction of the paper sheets, and the excitation core is disposed in the gap of each of the plurality of core bodies. A magnetic quantity detection sensor device, wherein a magnetic film is disposed.  [2] In claim 1, the core body has a horizontal plate portion that is horizontal to the sensor surface, and center and both end force in the conveyance direction of the paper sheet in the horizontal plate portion against the sensor surface. Three vertical plate portions extending vertically, and the excitation coil is disposed in the gap so as to surround a central vertical plate portion of the three vertical plate portions. Features a magnetic quantity detection sensor device.  [3] The magnetic quantity detection sensor device according to claim 1 or 2, wherein an interval between the adjacent core bodies is 0.05 mm to 2.5 mm.  [4] The magnetic quantity detection sensor device according to any one of claims 1 to 3, wherein an opening width dimension of the gap in the moving direction of the paper sheet is 0.3 mm to 5. Omm.  [5] Magnetic quantity detection including a core body having a sensor surface with an opening in the air gap and an excitation coil arranged in the air gap, and detecting a magnetic pattern of the paper sheet by moving relative to the paper sheet A magnetic quantity detection sensor as a sensor, wherein an opening width of the gap in a moving direction of the paper sheet is 0.3 mm to 5. Omm.  [6] In Claim 5, the core body includes a horizontal plate portion that is horizontal to the sensor surface, and a center and both end force in the conveyance direction of the paper sheet in the horizontal plate portion that is perpendicular to the sensor surface. A magnetic quantity detection sensor comprising: three extended vertical plate portions, wherein the excitation coil is disposed so as to surround a central vertical plate portion of the three vertical plate portions. . [7] A paper sheet identification device comprising the magnetic quantity detection sensor device according to any one of claims 1 to 6, wherein the sensor surface is directed toward a conveyance path through which the paper sheet is conveyed. A magnetic quantity detection sensor is arranged to supply an alternating current to the exciting coil, and the paper sheets A paper sheet identifying apparatus, wherein the paper sheet is identified based on a detection result of a change in magnetic field when transported through the transport path.  [8] In Claim 1, the core body has a magnetic sensing part projecting toward the paper sheet, and the excitation coil is disposed so as to surround the magnetic sensing part. The magnetic quantity detection sensor device is characterized in that the sensor surface is an end face side of the magnetosensitive portion surrounded by the exciting coil.  [9] In Claim 5, the core body has a magnetic sensing part projecting toward the paper sheet, and the excitation coil is disposed so as to surround the magnetic sensing part. The magnetic quantity detection sensor is characterized in that the sensor surface is an end face side of the magnetic sensing part surrounded by the exciting coil.