WO2020175122A1

WO2020175122A1 - Magnetism-detecting device and coin identification device

Info

Publication number: WO2020175122A1
Application number: PCT/JP2020/005066
Authority: WO
Inventors: 涼長谷川; 大貴横家
Original assignee: グローリー株式会社
Priority date: 2019-02-28
Filing date: 2020-02-10
Publication date: 2020-09-03
Also published as: JP7267037B2; JP2020140539A

Abstract

The present invention provides a magnetism-detecting device that can reduce the occurrence of output inversion, and a coin identification device that can improve coin identification accuracy. The present invention is a magnetism-detecting device comprising: a first detection coil provided on one surface side of a transport path along which coins are transported; a second detection coil provided on the one surface side of the transport path; an excitation coil that is provided on the one surface side of the transport path, and that generates a magnetic field in the transport path; and a differential output section that outputs differential output of the output of the first detection coil and the output of the second detection coil. The excitation coil is configured so that the magnetic flux density in the first detection coil is greater than the magnetic flux density in the second detection coil.

Description

\\02020/175 122 1 ((17 2020/005066

Specification

Title of invention: Magnetic detection device and coin identification device

Technical field

The present invention relates to a magnetic detection device and a coin identification device. More specifically, the present invention relates to a magnetic detection device and a coin identification device suitable for detecting the magnetic characteristics of coins being conveyed.

Background technology

[0002] Conventionally, a coin processing device that performs processing such as counting coins is equipped with a coin identifying device for identifying the denomination of coins. The coin identification device is equipped with, for example, a magnetic detection device (magnetic detection sensor) that detects the magnetic characteristics of coins, and the denomination of coins is identified based on the detection result of the magnetic detection device.

[0003] In Patent Documents 1 and 2, a plurality of reflection detection coils (secondary coils) each composed of a wire-type chip inductor are arranged at a predetermined pitch in a direction orthogonal to the coin transport direction, and these reflection detection coils are detected. A magnetic detection device is disclosed in which an exciting coil (primary coil) is provided so as to surround the coil.

[0004] Further, Patent Documents 1 and 2 disclose examples in which the reflection detection coils are arranged in two rows, and Patent Document 2 discloses two reflection channels in which each output channel is adjacent in the vertical direction. It is described that a combined output obtained by combining the output signals of the detection coils may be output. Further, Patent Document 2 describes that two reflection detection coils of the same output channel may be configured to output signals having mutually opposite phases.

Prior art documents

Patent literature

[0005] Patent Document 1: International Publication No. 2 0 1 7/1 6 4 3 4 7

Patent Document 2: International Publication No. 2 0 18/188 0 8 9 9

Summary of the invention

Problems to be Solved by the Invention 〇 2020/175 122 2 (:171? 2020/005066

[0006] However, when the output channel outputs a differential output of the outputs of two reflection detection coils that are vertically adjacent to each other, the output is a change in the position of each reflection detection coil and a change in the winding of the exciting coil. Etc. will be greatly affected. Above all, the fluctuation of the winding of the exciting coil has a large effect, and as shown in Fig. 17, when the number of windings in the part of the exciting coil 211 on the side of the conveying path is small, the phase of the differential output is desired. It was sometimes reversed from the phase of. In this case, the identification accuracy of the coin identification device deteriorates.

[0007] The present invention has been made in view of the above circumstances, and an object thereof is to provide a magnetic detection device that can reduce the occurrence of output reversal and a coin identification device that can improve the identification accuracy of coins. To do.

Means for solving the problem

[0008] In order to solve the above-mentioned problems and to achieve the object, the present invention is a magnetic detection device, comprising: a first detection coil provided on one surface side of a transfer path through which coins are transferred; A second detection coil provided on the one surface side of the path; an exciting coil provided on the one surface side of the transport path for generating a magnetic field in the transport path; and an output of the first detection coil and the second A differential output section that outputs a differential output of the output of the detection coil, and the excitation coil is configured such that the magnetic flux density in the first detection coil is higher than the magnetic flux density in the second detection coil. It is characterized by being done.

[0009] Further, in the present invention according to the above-mentioned invention, the exciting coil has more coil wires wound in a second portion closer to the transport path than in a first portion farther from the transport path. It is characterized by

Further, the present invention is characterized in that, in the above-mentioned invention, the exciting coil is located closer to the first detection coil than the second detection coil.

[001 1] Further, in the present invention, when the side closer to the transport path is an upper side and the side farther from the transport path is a lower side in the above invention, the exciting coil has a coil wire from a lower side to an upper side. A first layer portion wound in a spiral shape, and a second layer portion in which the coil wire is spirally wound on the first layer portion from above to below. 〇 2020/175 122 3 (:171? 2020/005066

And a third layer portion in which the coil wire is spirally wound on the second layer portion from below to above, and the third layer portion is further away from the transport path. It is characterized in that it is provided from an intermediate portion between the first portion of the exciting coil and the second portion of the exciting coil which is closer to the transport path to the second portion.

[0012] Further, the present invention is characterized in that, in the above-mentioned invention, each of the first detection coil and the second detection coil is a winding type chip inductor.

[0013] Further, the present invention is a coin identifying device, comprising: the magnetic detecting device; and an identifying unit for identifying coins carried on the carrying path based on a detection result of the magnetic detecting device. It is characterized by being provided.

Effect of the invention

[0014] According to the magnetic detection device of the present invention, it is possible to reduce the occurrence of output inversion. [0015] According to the magnetic identification device of the present invention, the identification accuracy of coins can be improved.

Brief description of the drawings

[0016] [Fig. 1] Fig. 1 is a functional block diagram of a coin identifying device according to a first embodiment.

[Fig. 2] Fig. 2 is a schematic perspective view of an exciting coil, a first detecting coil, and a second detecting coil included in the magnetic detection device according to the first embodiment.

FIG. 3 is a schematic plan view of a circuit board of the magnetic detection device according to the first embodiment, where (3) shows one main surface on which the first detection coil and the second detection coil are mounted, and () is The other main surface in which a pad is formed is shown.

[Fig. 4] Fig. 4 is a diagram for explaining the positional relationship between the exciting coil, the first detecting coil, and the second detecting coil in the magnetic detecting device according to the first embodiment, and the relationship between the output of each detecting coil and the differential output. Yes, a schematic sectional view of the magnetic detection device, an example of the output of the first detection coil (sense side) during standby, an example of the output of the second detection coil (standby side) during standby, and the difference during standby An example of dynamic output is shown.

[Fig. 5] Fig. 5 is a diagram for explaining the positional relationship between the excitation coil, the first detection coil, and the second detection coil in the magnetic detection device according to the first embodiment, and the relationship between the output of each detection coil and the differential output. Yes, a schematic sectional view of the magnetic detection device, and 〇 2020/175 122 4 (:171? 2020/005066

An example of the output of the first detection coil (sense side), an example of the output of the second detection coil (canceling side) when a coin enters, and an example of the differential output when a coin enters are shown.

[Fig. 6] Fig. 6 is a diagram for explaining the positional relationship between the exciting coil, the first detecting coil, and the second detecting coil in the magnetic detection device according to Comparative Embodiment 1, and the relationship between the output of each detecting coil and the differential output. Yes, a schematic sectional view of the magnetic detection device, an example of the output of the first detection coil (sense side) during standby, an example of the output of the second detection coil (standby side) during standby, and the difference during standby An example of dynamic output is shown.

[Fig. 7] Fig. 7 is a diagram for explaining an arrangement relationship between an excitation coil, a first detection coil, and a second detection coil in a magnetic detection device according to Comparative Embodiment 1, and a relationship between outputs of the detection coils and differential outputs. Yes, a schematic sectional view of a magnetic detection device, an example of the output of the first detection coil (sense side) when a coin enters, an example of the output of the second detection coil (canceling side) when a coin enters, and a coin And an example of differential output at the time of approach.

FIG. 8 is a schematic plan view of the exciting coil and the circuit board according to the first embodiment, showing a state before the exciting coil is soldered to the circuit board.

FIG. 9 is a schematic diagram of a coil bobbin provided in the magnetic detection device according to the first embodiment, (3) is a plan view, and () is a perspective view.

FIG. 10 is a schematic plan view of an exciting coil and a coil bobbin included in the magnetic detection device according to the first embodiment.

[Fig. 11] Fig. 11 is a diagram for explaining a winding method of the exciting coil included in the magnetic detection device according to the first embodiment, and is a schematic sectional view of the exciting coil and the coil bobbin.

[Fig. 12] Fig. 12 is a diagram for explaining a method of winding the exciting coil included in the magnetic detection device according to the first embodiment, wherein (3), (, and (○) are the first layers obtained by winding the coil wire. A case where a portion, a second layer portion, and a third layer portion are respectively formed is shown in Fig. 13. Fig. 13 is a diagram showing an example of a configuration of the magnetic detection device according to the first embodiment.

FIG. 14 is a diagram showing a connection relationship between the first detection coil and the second detection coil according to the first embodiment.

FIG. 15 is a schematic sectional view of a magnetic detection device according to a modified embodiment of the present invention. FIG. 16 is a schematic sectional view of a magnetic detection device according to another modification of the present invention.

FIG. 17 is a schematic plan view of an exciting coil according to another comparative form.

MODE FOR CARRYING OUT THE INVENTION

[0017] In the present specification, "to output a differential output of two outputs" means to output a difference between outputs of two isophases and to output by adding two outputs of opposite phases. Both cases are included.

[0018] (Embodiment 1)

Hereinafter, preferred embodiments of a magnetic detection device and a coin identification device according to the present invention will be described in detail with reference to the drawings. The magnetic detection device according to the present embodiment is used to detect the magnetic characteristics of coins in the coin identification device.

[0019] As shown in FIG. 1, the coin discriminating apparatus 1 000 according to the present embodiment includes a magnetic detection device 100, an identification control unit 200, a storage unit 300, a communication unit 400, and a conveying unit 500. And

[0020] The magnetic detection device 100 applies a magnetic field to the coins conveyed through the conveyance path, and detects the magnetic characteristics of the coins based on the output signal based on the induced voltage by the magnetic fields. [0021] The magnetic detection device 100 includes a magnetic detection unit 110 and a control unit 120.

The magnetic detection unit 110 is configured to include a mutual induction type magnetic sensor. The control unit 120 controls the magnetic detection device 100 and also detects the magnetic characteristics of the coin based on the output of the magnetic detection unit 110. Further, the control unit 120 outputs the detected magnetic characteristics of the coin to the identification control unit 200.

[0022] The identification control unit 200 identifies the type (denomination) of coins to be detected, based on the magnetic characteristics detected by the magnetic detection device 100.

[0023] The identification control unit 200 includes, for example, as shown in FIG. 1, an identification unit 210, a transport control unit 220, and a processing unit 230.

[0024] The control unit 120 and the identification control unit 200 are, for example, a software program for realizing various processes, a CPU that executes the software program, various hardware controlled by the CPU, and F Logical device such as PGA (Field Programmable Gate Array) 〇 2020/175 122 6 (:171? 2020/005066

It is composed of chairs. To store the software programs and data necessary for the operation of each part, the storage part 300 and the separately provided memory and hard disk such as 8 1/1 and [¾ 0 1/1] are used.

[0025] The identification unit 210 compares the magnetic characteristic detected by the magnetic detection device 100 with the reference value or the like stored in the storage unit 300 for the coin to be detected in advance. By doing so, it has a function of identifying the type of coin.

[0026] The transfer control unit 220 controls the transfer unit 500 of the coin identifying device 100.

[0027] The processing unit 230 executes various processes necessary for the operation of each unit.

[0028] The storage unit 300 is configured by a storage device such as a volatile or non-volatile memory or a hard disk, and stores various data necessary for the processing performed by the coin discriminating apparatus 100,000. Used.

[0029] The storage unit 300 is configured to store the identification result by the identification control unit 200. In addition, the storage unit 300 stores various kinds of reference values used for performing coin discrimination processing and the like, and information related to these.

[0030] The communication unit 400 has a function of receiving a signal from the outside of the coin discriminating apparatus 100 and transmitting the signal from the coin discriminating apparatus 100 to the outside.

[0031] The communication unit 400 receives, for example, a signal from the outside, and the control unit 1

Change the operation settings of the 20 and the identification control unit 200, update the software programs and data stored in the storage unit 300, add and delete processing, and operate the coin identification device 1 0 The result of coin identification by 0 0 can be output to the outside.

[0032] The transport unit 500 includes a transport mechanism for transporting coins. The transfer mechanism includes transfer means such as fins and transfer belts.

[0033] Hereinafter, the details of the magnetic detection device 100 will be described. As shown in Fig. 2, the magnetic detection device 100 is a multi-channel type magnetic detection sensor, and includes an excitation coil (—second coil) 11 and a plurality of detection coils (secondary coil) 12 Equipped with. The excitation coil 11 and the detection coil 12 are located on the same side of the transport path for coins <3 provided in the coin processing machine (usually above or below, in Fig. 1 below). 〇 2020/175 122 7 (:171? 2020/005066

Each detection coil 12 is arranged and outputs an output signal based on the induced voltage induced by the magnetic field generated by the excitation coil 11 in the carrier path. When coins <3 are transported in the transport path, each detection coil 12 induces an induced voltage by the magnetic field generated by the exciting coil 11 and reflected by the coins <3, and the output based on this induced voltage is generated. Output a signal.

[0034] Coins <3 are transferred on the transfer path by the transfer means (fins, transfer belts, etc.) of the coin processing machine. The coin <3 slides on the transport surface that supports the underside of the coin <3 in the transport path. Coins <3 may be transported in any of the transport directions indicated by the double-headed arrow in FIG.

[0035] The plurality of detection coils 12 are arranged in a direction intersecting with the transport direction of coins <3, preferably in a direction orthogonal thereto. Further, the detection coils 12 are arranged in two rows in parallel with the transport surface. Then, each channel on the secondary side, that is, each output channel of the magnetic detection device 100, is connected to the first detection coil (hereinafter, sense side coil).

1 2 ₃ and a second detection coil (hereinafter referred to as a cancel side coil) 1 2 arm provided on the opposite side of the sense side coil 1 2 _{3 from} the conveyance path. Each cancel-side coil 12 ₃ is arranged farther from the transport path than the corresponding sense-side coil 12 ₃ .

[0036] As shown in Fig. 3(a), each detection coil 12 is connected to a circuit board (printed circuit board).

It is the same type of wire wound type chip inductor mounted on 50, and a coil wire (not shown) is wound around a core (not shown). This allows each detector coil 12 to function as a coil of substantially the same performance. As shown in Fig. 3 (b), two pads (terminals) 54 to which the excitation coil 11 is connected are formed on the main surface of the circuit board 50 where the detection coil 12 is not provided. Has been done.

[0037] Sense coil 1 2 3, and a cancel coil 1 2 13 each output mosquito channel is connected to a differential circuit to be described later, the sense coil 1 2 ₃ output and Cancel coil 1 2 13 The differential output of is output from each output channel. As a result, it is possible to cancel the external magnetic field, and to widen the fluctuation range of the output of the magnetic detection device 100 between the standby time and the coin <3 approach. 〇 2020/175 122 8 卩 (：171? 2020 /005066

Therefore, the detection accuracy of the magnetic detection device 100 can be improved.

[0038] The exciting coil 11 generates a magnetic field in the transport path when an AC voltage is applied. The exciting coil 11 is a single coil, and as shown in FIGS. 2 and 4, the exciting coil 11 has a coil wire 40 that surrounds a plurality of sense coils 1 2 ₃ and their cores. It is wound, and the core for each sense side coil 1 2 3 also functions as the core of the exciting coil 1 1. Further, each sense side coil 1 2 3 is located inside the exciting coil 11 1, but each cancel side coil 12 2 is located outside the exciting coil 11 1. An alternating voltage of a single frequency or an alternating voltage containing a plurality of frequencies is applied to the exciting coil 11 from an alternating current power source, which will be described later, and a magnetic field is generated in the carrier path.

[0039] Here, by appropriately setting the frequency of the AC voltage applied to the exciting coil 11, the output of each sense side coil 1 2 3 and the output of the cancel side coil 1 2 13 are set to the material of coin 〇. The output will be according to the above. In this embodiment, the number 1 <1 ^~ 1 2 ~ the number

[0040] Then, the exciting coil 1 1, the magnetic flux density in each sense coil 1 2 ₃ is configured to be larger than the magnetic flux density in the cancel coil 1 2 spoon that corresponds. That is, in the magnetic field generated by the exciting coil 11, each of the sense side coils 12 ₃ is located in a place where the magnetic field is stronger, and the corresponding cancel side coil 12 2 is located in a place where the magnetic field is weaker. Therefore, as shown in Figs. 4 and 5, the output of the sense side coil 1 2 3 is canceled in each output channel both when the coin is not waiting and when the coin 0 enters. Since it can be made larger than the output of 1 2, it is possible to invert the differential output of these outputs without adjusting the output of the sense side coil 1 2 3 and/or the output of the cancel side coil 1 2 13. Can be suppressed.

[0041] More specifically, the exciting coil 11 has more coil wires 4 0 in the second portion 1 1 claw that is closer to the transport path than the first portion 1 1 3 that is farther from the transport path. Has been done. As a result, in each output channel, the sense side coil 〇 2020/175 122 9 (:171? 2020/005066

The magnetic flux density in the rule 1 2 3 can be effectively made higher than that in the canceling side coil 1 2. In addition, even if the winding operation of the coil wire 40 is automated, even if the number of turns of the coil wire 40 becomes smaller than the desired number of turns of the coil wire 40 in the second portion 1 1 The magnetic flux density at 2 3 can be made higher than the magnetic flux density at the canceling coil 1 2 13.

[0042] On the other hand, as shown in Fig. 6, the coil wire 1440 was wound less in the second part 1 1 1 claw which is closer to the transport path than the first part 1 1 1 3 which is farther from the transport path. When the exciting coil 1 1 1 is used, each sense side coil 1

The magnetic flux density at is smaller than the magnetic flux density at the corresponding cancel-side coil 1 2 13. Therefore, when there is no coin 〇, the output of the sense side coil 1 2 3 becomes smaller than the output of the cancel side coil 1 2 13 in each output channel, and the differential output of these outputs is inverted. When the coin 〇 enters, as shown in Fig. 7, the output of each sense side coil 1 2 3 increases, and the differential output may not reverse but may have a desired phase. is there. However, even in such a case, the output value of the differential output itself is different from the desired output value shown in Fig. 5.

As shown in FIG. 8, in the magnetic detection device 100, a rectangular tubular coil bobbin 20 wound with a coil wire 40 is attached to an end portion of a circuit board 50 on which the detection coil 12 is mounted. It has a structure that is inserted and attached. Both ends of the winding start and the winding end of the coil wire 40 are respectively wound around a pair of protrusions 32 of the coil bobbin 20. The coil wire 40 wound around the coil bobbin 20 functions as the exciting coil 1 1.

As shown in FIGS. 9A and 9C, the coil bobbin 20 has a rectangular tube-shaped main body.

The main body 21 has a rectangular cross section orthogonal to the axial direction and has narrow flanges 2 2 and 2 3 provided at the axially front and rear ends, respectively, and the flange 2 It has a band-shaped concave portion 24 sandwiched by the portions 22 and 23. The concave portion 24 is provided in an annular shape (for one round) on the peripheral surface of the main body portion 21. Two notches 25 are formed in the flange 23 on the axially rear end side. Notches 〇 2020/175 122 10 units (：171? 2020 /005066

A pair of projections 3 2 are projected from a pair of ends of the flange 23 located on both sides of 25. The pair of protrusions 32 are provided with a gap 33 having a predetermined size. Each of the protrusions 32 has a flat plate shape that is long in the axial direction, and is connected to the recess 24 through the notch 25. The coil bobbin 20 is molded from an insulating material such as an insulating synthetic resin.

[0045] As shown in Fig. 10, the coil wire 40 is wound around the recess 24 of the coil bobbin 20 with a constant tension to form a coil portion 42 that functions as the exciting coil 11 1. .. Both ends 4 1 of the coil wire 40 extending from both ends of the coil portion 42 are pulled out from the cutout portion 25 to the pair of protrusion portions 32, respectively, and are wound around the pair of protrusion portions 3 2. It is fixed. Each protrusion 32 has an axially intermediate portion constricted on the side opposite to the gap 33, and a coil wire 40 is wound around the constricted portion. Each end 41 of the coil wire 40 is bridged over the corresponding pair of protrusions 32 on the side of the circuit board 50. More specifically, each end 41 of the coil wire 40 is wound around one of the corresponding pair of protrusions 32, and the pair of protrusions 3 2 is connected to the pair of protrusions 32 from the circuit board 50 side. Of the protrusion 32, and is wound around the other protrusion 32 from the side of the circuit board 50.

[0046] In the present embodiment, the coil wire 40 is wound around the coil bobbin 20 while tension is applied from one end to the other end, and it is not necessary to provide slack. Therefore, the winding work of the coil wire 40 to the coil bobbin 20 can be automated.

[0047] Here, assuming that the side closer to the transport path is the upper side and the side farther from the transport path is the lower side, as shown in Figs. 11 and 12 (a), the exciting coil 11 is the coil wire 40 Is spirally wound from the lower side (flange section 2 3 side) to the upper side (flange section 2 2 side) without any gap, and then from the upper side to the lower side as shown in FIGS. 11 and 12 (b). It is spirally wound around without any gaps, and as shown in FIGS. 11 and 12 (◯), it is spirally wound without gaps from the lower side to the upper side. As a result, in the exciting coil 11, the coil wire 40 is wound from the lower side to the upper side in a spiral shape in the first layer portion 1 1 1 to 3 and the coil wire 40. 〇 2020/175 122 1 1 卩(：171? 2020/005066

Is the first layer portion 1 1 !_ ₃ The second layer portion 1 is spirally wound from the upper side to the lower side.

The coil wire 40 has a third layer portion 1 1 !_ ◯ spirally wound from above to above the second layer portion 1 1 !__ underside. The third layer portion 11!_○ is the intermediate portion between the first portion 1 1 3 of the exciting coil 11 farther from the transport path and the second portion 1 1 of the exciting coil 11 closer to the transport path. It is provided from part 1 1 0 to second part 1 1. As a result, as described above, it is possible to easily realize the exciting coil 11 in which the coil wire 40 is wound more in the second portion 1 1 3 than in the first portion 1 1 3.

As shown in FIGS. 3A and 3B, the circuit board 50 has a rectangular substrate with one side formed in a convex shape, and one end portion 5 1 is provided with a protruding portion 52. It has a flat shape. Various wiring patterns (not shown) are provided on both main surfaces of the circuit board 50, and the detection coil 12 that is a chip inductor and a predetermined electronic circuit such as an oscillation circuit and a signal processing circuit are configured. Electronic components (not shown except for the detection coil 12) are mounted. As shown in FIG. 3(a), the plurality of detection coils 12 are arranged at equal intervals on the projecting portions 52 of the circuit board 50. As shown in Fig. 3 (b), the two pads 5 4 provided on the main surface on the side where the detection coil 12 is not provided are the gaps between the protrusions 3 2 of each pair of coil bobbins 20. It is provided at a position corresponding to 33, and is provided at a distance similar to that between the two gaps 33. Each pad 54 is surface-treated with a solder leveler, preflux, etc. The protruding portion 52 of the circuit board 50 functions as a mounting portion to which the coil bobbin 20 is attached.

In the above configuration, as shown in FIG. 8, the protrusion 3 2 is on the side of the pad 54, and the coil bobbin 20 wound around the coil wire 40 is the protrusion on which the detection coil 12 is mounted. 5 2 Fit with some play. Then, the pair of protrusions 32 are located on both sides of the pad 5 4, and both ends 41 of the coil wire 40 wound around the pair of protrusions 32 are located on the pad 5 4. Become. Then, using solder (not shown) as a joining material, both ends 4 1 of the coil wire 40 wound around the pair of protrusions 32 are soldered to the pads 5 4 respectively and electrically. When connected 〇 2020/175 122 12 (:171? 2020/005066

Fix both together. At this time, each end 41 of the coil wire 40 is individually soldered to the pad 5 4 instead of being soldered to the protrusion 32. Then, an adhesive (not shown) is injected into the gap between the coil bobbin 20 and the circuit board 50 to fix it more firmly. In the present embodiment, since each protrusion 32 is not fixed by solder, it is preferable to fix the coil bobbin 20 to the circuit board 50 using an adhesive as described above.

[0050] The magnetic detection unit 110 according to the first embodiment will be described in detail below. The magnetic detection unit 110 includes, for example, as shown in FIG. 13, a sensor unit (a magnetic sensor for coin identification) and a processing unit.

The sensor unit of the magnetic detection unit 110 is, for example, as shown in FIG.

I, exciting coil (primary coil) 11 and multiple detection coils (secondary coil) 1 2 (sense side coil 1 2 3 and cancel side coil 1 2 13) and circuit board 5 0 (in Fig. 13) (Not shown), and. Each sense coil 1 2 ₃ is turned detecting core hundred 1 wound, the cancel coil 1 2 spoon is wound detecting core hundred 2 wound.

The AC power supply generates an AC voltage 1. This AC power source is arranged on the circuit board 50, for example. The AC voltage 1 is, for example, an AC voltage including one specific frequency or an AC voltage (combined signal) including two or more specific frequencies.

Further, the excitation coil 11 is applied with the AC voltage 1 output from the AC power supply, and generates the magnetic field 1\/1 in the transport path.

[0054] exciting coil 1 1 is wound as a plurality of sense coil 1 2 ₃ surrounds a plurality of detection core hundred 1 and a plurality of sense coil 1 2 3 to be wound respectively.

[0055] The sense side coil 1 2 3 and the cancel side coil 1 2 匕 induce an induced voltage by the magnetic field IV! generated by the exciting coil 11 and detect signals 3 1 1 and 3 based on the induced voltage, respectively. Output 1 2 Then, the sense side coil 1 2 ₃ and the cancel side coil 1 2 swell changed as coins <3 were transferred along the transfer path. 〇 2020/175 122 13 卩(: 171-1? 2020/005066

Based on the induced voltage induced by the magnetic field IV!, it outputs detection signals 3 1 1 and 3 1 2, respectively.

The processing unit of the magnetic detection unit 110 acquires the detection signal output by the sensor unit, performs signal processing on this detection signal, and outputs a determination signal. The processing unit has a differential circuit port ◯.

[0057] The differential circuit 0 (3 outputs the differential output of the output of the sense side coil 1 2 3 and the output of the cancel side coil 1 2 3 as a differential signal 3 2 1. In the present embodiment, The connection between the side coil 1 2 3 and the circuit board 50 and the connection between the cancellation side coil 1 2 and the circuit board 5 0 are reversed from each other. More specifically, as shown in FIG. , And connect the sense side coil 1 2 3 and the cancel side coil 1 2 13. By this, the output of the sense side coil 1 2 3 and the output of the cancel side coil 1 2 claw are in opposite phase to each other. The output (voltage) of the sense side coil 1 2 3 and the output (voltage) of the cancel side coil 1 2 13 are added together at the road entrance ◯ and output.

The connection between the sense side coil 1 2 3 and the circuit board 5 0 and the connection between the sense side coil 1 2 3 and the circuit board 5 0 do not have to be reversed. As a result, the output of the sense side coil 1 2 3 and the output of the cancel side coil 1 2 13 may be in phase with each other. Then, the output (voltage) of the cancel side coil 1 2 13 may be subtracted from the output (voltage) of the sense side coil 1 2 3 at the differential circuit port ◯ and output.

The processing unit performs analog signal processing such as amplification processing and filter processing on the differential signal 3 2 1 output from the differential circuit port (3), converts it to a digital signal, and converts the digital signal. Although the signal processing is performed and the determination signal is output, the processing unit in this embodiment performs analog signal processing, but the signal processing in the processing unit may be performed by digital processing.

As described above, in the present embodiment, the exciting coil 11 is configured so that the magnetic flux density in each of the sense coils 1 2 3 is larger than the magnetic flux density in the corresponding cancel coil 1 2 13. Waiting for no coin 0 because it is configured 〇 2020/175 122 14 卩 (: 171? 2020 /005066

The output of the coil 1 2 3 on the sensing side can be made larger than the output of the coil 1 2 13 on the canceling side in each output channel regardless of whether It is possible to prevent the differential output from being inverted.

[0061] Further, in the present embodiment, the coin discriminating apparatus 100 has a discriminating unit 2 1 for discriminating coins <3 based on the detection results of the magnetic detection device 100 and the magnetic detection device 100. Since 0 and are provided, the discriminating ability for coins <3 can be improved.

[0062] In the above embodiment, the coil wire 40 is wound more in the second portion 1 1 sill than in the first portion 1 1 3 of the exciting coil 11 so that each output channel is The case where the magnetic flux density in the sense side coil 1 2 3 is made larger than the magnetic flux density in the cancel side coil 1 2 has been explained, but the magnetic flux density in the sense side coil 1 2 3 The specific method for increasing the magnetic flux density is not particularly limited. For example, as shown in FIG. 15, the exciting coil 11 may be located closer to the sense side coil 1 23 than to the cancel side coil 12 2. Such an exciting coil 11 can be easily realized by providing an inclination in the entire recess 24 of the coil bobbin 20.

[0063] Further, as shown in Fig. 16, by providing an inclination in a part of the concave portion 24 of the coil bobbin 20 on the side of the conveying path, the second portion of the exciting coil 11 is smaller than that of the first portion 1 1 3. The coil wire 40 may be wound more in the portion 11 and the exciting coil 11 may be arranged closer to the sense side coil 1 2 3 than to the cancel side coil 12 2.

In the above embodiment, the case where the sense side coil 1 2 ₃ is located inside the exciting coil 11 1 and the cancel side coil 1 2 13 is located outside the exciting coil 11 1 has been described. The location of the side coil 1 2 3 and the cancel side coil 1 2 arm is not particularly limited as long as the magnetic flux density in the sense side coil 1 2 3 is higher than the magnetic flux density in the cancel side coil 1 2 arm. The coil 1 2 13 on the cancel side and the coil 1 2 3 on the sense side are located inside the exciting coil 1 1. 〇 2020/175 122 15 卩 (: 171? 2020 /005066

Alternatively, the cancel-side coil 12 and the sense-side coil 1 23 may be located outside the exciting coil 11.

In the above embodiment, the case where the magnetic detection device 100 is a multi-channel type has been described, but the magnetic detection device 100 may be a one-channel type magnetic detection sensor. .. That is, the magnetic detection device 100 may have one set of the sense side coil 1 2 3 and the cancel side coil 1 2 13 instead of a plurality of sets.

Although the embodiments of the present invention have been described with reference to the drawings, the present invention is not limited to the above embodiments. Further, the configurations of the respective embodiments may be appropriately combined or modified within the scope not departing from the gist of the present invention.

Industrial availability

[0067] As described above, the present invention is a technique useful for detecting the magnetic characteristics of a coin being conveyed.

Explanation of symbols

[0068] 1 1: Excitation coil (primary coil)

1 1 3：Excitation coil 1st part

1 1 匕：Excitation coil 2nd part

1 1 〇: Intermediate part of exciting coil

1 First layer part of exciting coil

1 1 !_ 匕：Excitation coil 2nd layer

1 1 !_ 〇: 3rd layer part of exciting coil

1 2 :Detection coil (secondary coil)

1 2 3 :First detection coil (sense side coil)

1 2 匕：Second detection coil (cancellation coil)

20: coil bobbin

2 1: Main body

2 2, 2 3 :Flange part \\02020/175 122 16 €!71?2020/005066

24: recess

25: Notch

32: Projection

33: Gap

40: Coil wire

4 1: Edge

42: Coil part

50: Circuit board

5 1: One end of circuit board

52: Projection

54: Pad (terminal)

1 00: Magnetic detection device

1 1 0: Magnetic detector

1 20: Control unit

200: Identification control unit

21 0: Identification section

220: Transport control unit

230: Processing unit

300: Memory

400: Communication part

500: Transport section

1 000: Coin identification device

○ X: Excitation core

〇 001, 002: Detection core

〇〇: Differential circuit

IV!: magnetic field

31 1, 31 2 :Detection signal

32 1: Differential signal 〇 2020/175 122 17 卩(：171? 2020/005066

: Processing unit

V: Sensor section

:AC source

1: AC voltage

0: coin

: Transport path

Claims

\¥02020/175 122 18 卩(: 17 2020/005066 Claims

[Claim 1] A first detection coil provided on one surface side of a transfer path along which coins are transferred, and a second detection coil provided on the one surface side of the transfer path,

An exciting coil that is provided on the one surface side of the transport path and that generates a magnetic field in the transport path;

A differential output section that outputs a differential output of the output of the first detection coil and the output of the second detection coil,

The magnetic field detector according to claim 1, wherein the exciting coil is configured such that a magnetic flux density in the first detection coil is higher than a magnetic flux density in the second detection coil.

2. The exciting coil has more coil wires wound in a second portion closer to the transport path than in a first portion farther from the transport path. The magnetic detection device described.

[Claim 3] The excitation coil is located closer to the first detection coil than the second detection coil

The magnetic detection device according to claim 1 or 2, characterized in that:

[Claim 4] When the side closer to the transport path is the upper side and the side farther from the transport path is the lower side,

The exciting coil includes a first layer portion in which a coil wire is spirally wound from a lower side to an upper side, and the coil wire is spirally wound from an upper side to a lower side on the first layer portion. And a third layer portion in which the coil wire is spirally wound on the second layer portion from the lower side to the upper side,

The third layer portion is provided from an intermediate portion between the first portion of the exciting coil farther from the transport path and the second portion of the exciting coil closer to the transport path to the second portion.

The magnetic detection device according to any one of claims 1 to 3, wherein:

[Claim 5] Each of the first detection coil and the second detection coil is a linear chip. 〇 2020/175 122 19 卩(：171? 2020/005066

Is an inductor

The magnetic detection device according to any one of claims 1 to 4, characterized in that:

[Claim 6] The magnetic detection device according to any one of claims 1 to 5,

An identification unit for identifying coins transported on the transport path based on a detection result of the magnetic detection device.

A coin identification device characterized by the above.