JP2017058982A - Magnetic array sensor for coin discrimination - Google Patents
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Abstract
Description
本発明は、硬貨の識別に用いる磁気アレイセンサに関する。 The present invention relates to a magnetic array sensor used for identifying coins.
硬貨が通過する硬貨通過経路に配置され、通過する硬貨の識別要素を磁気的に測定する硬貨識別用磁気アレイセンサが提案されている。この種の硬貨識別用磁気アレイセンサによって磁気的に測定可能な硬貨の識別要素としては、材質、直径、孔の有無、厚さ、表面形状などがあり、例えば、特許文献１では、硬貨の表面形状を検出する磁気アレイセンサが提案されている。 2. Description of the Related Art There has been proposed a coin identification magnetic array sensor that is arranged in a coin passage path through which a coin passes and that magnetically measures an identification element of the passing coin. Examples of coin identification elements that can be measured magnetically by this type of coin identification magnetic array sensor include material, diameter, presence / absence of holes, thickness, surface shape, and the like. Magnetic array sensors that detect shape have been proposed.
従来、硬貨の識別に用いる磁気ヘッドとしては、励磁コイルと検出コイルを同じコアに巻装するものと、励磁コイルと検出コイルを別々のコアに巻装し、コア同士を硬貨通過経路を介して対向配置するものとが知られている。 Conventionally, as a magnetic head used for identifying coins, an excitation coil and a detection coil are wound around the same core, and an excitation coil and a detection coil are wound around different cores, and the cores are passed through a coin passage path. It is known that they face each other.
前者では、励磁コイルを発振回路で常時駆動しつつ、検出コイルから出力される振動波の振幅変化を硬貨の識別要素として測定しているが、励磁コイル側を連続駆動しているため、検出コイル側の振幅変化が微小であり、その結果、アンプによる増幅率が高くなり、ノイズなどの影響を受けやすいという問題がある。また、前者では、励磁コイルと検出コイルがコアを介して磁気的に結合しているので、検出コイルから出力される振動波は位相が一定であり、振動波の位相変化を硬貨の識別要素として利用することが困難である。そのため識別要素が不足し、特に硬貨の材質を高精度に識別することが困難であった。 In the former, while the excitation coil is always driven by the oscillation circuit, the amplitude change of the vibration wave output from the detection coil is measured as a coin identification element. However, since the excitation coil side is continuously driven, the detection coil There is a problem that the amplitude change on the side is minute, and as a result, the amplification factor by the amplifier becomes high, and it is easily affected by noise and the like. In the former, since the excitation coil and the detection coil are magnetically coupled via the core, the vibration wave output from the detection coil has a constant phase, and the phase change of the vibration wave is used as a coin identification element. It is difficult to use. For this reason, there are insufficient identification elements, and it is particularly difficult to identify the material of coins with high accuracy.
一方、後者では、励磁コイルのコアと検出コイルのコアが分離されているので、検出コイルから出力される振動波は、通過する硬貨に応じて振幅及び位相が変化することになり、振動波の振幅変化及び位相変化を硬貨の識別要素として利用することが可能であるが、励磁コイル側を連続駆動しているため、検出コイル側の位相変化が微小であり、その結果、励磁コイル側と検出コイル側の位相の差分をアンプで増幅するにあたり、アンプによる増幅率が高くなり、ノイズなどの影響を受けやすいという問題がある。また、後者では、振動波の振幅変化に関しては、コアの分離に起因し、前者よりもゲインが低下するという問題がある。 On the other hand, in the latter, since the excitation coil core and the detection coil core are separated, the vibration wave output from the detection coil changes in amplitude and phase according to the passing coins, Amplitude change and phase change can be used as an identification element for coins, but because the excitation coil side is continuously driven, the phase change on the detection coil side is very small. When the phase difference on the coil side is amplified by the amplifier, there is a problem that the amplification factor by the amplifier becomes high and is susceptible to noise and the like. In the latter case, the amplitude of the vibration wave has a problem that the gain is lower than the former due to the separation of the core.
本発明は、上記の如き実情に鑑みこれらの課題を解決することを目的として創作されたものであって、請求項１の発明は、硬貨が通過する硬貨通過経路に配置され、通過する硬貨の識別要素を磁気的に測定する硬貨識別用磁気アレイセンサであって、前記硬貨通過経路を通過する硬貨の表面に沿って並ぶ複数の磁気ヘッドと、各磁気ヘッドに巻装されたコイルと、各コイルにそれぞれコンデンサを接続して構成される複数の共振回路と、各共振回路を所定の順番で間欠的に駆動させる共振回路順次駆動手段と、駆動後に各共振回路から出力される振動減衰波の位相及び振幅を測定する位相振幅測定手段と、振動減衰波の位相及び振幅を測定した後、当該共振回路が次回駆動されるまでの間、当該共振回路の一端側又は中間部を開放、又は当該共振回路の一端側又は中間部をプルダウン抵抗に接続させることで他の共振回路との磁気干渉を規制する磁気干渉規制手段と、各共振回路に係る振動減衰波の位相測定値及び振幅測定値を出力する測定値出力手段と、を備え、前記位相振幅測定手段は、駆動後に共振回路から出力される振動減衰波の波数をカウントし、該カウント数が所定数に達するまでの時間に基づいて当該振動減衰波の位相を測定することを特徴とする。
また、請求項２の発明は、請求項１に記載の硬貨識別用磁気アレイセンサであって、前記磁気干渉規制手段は、振動減衰波の位相及び振幅を測定した後、当該共振回路の一端側又は中間部をプルダウン抵抗に接続させて当該共振回路の残留エネルギーを除去し、その後、当該共振回路の一端側又は中間部を開放させることを特徴とする。
また、請求項３の発明は、請求項１又は２に記載の硬貨識別用磁気アレイセンサであって、前記共振回路順次駆動手段は、共振回路を駆動させる前に、当該共振回路の一端側又は中間部をグランド又はプルダウン抵抗に接続させて当該共振回路の初期バイアス電圧を除去することを特徴とする。
また、請求項４の発明は、請求項１〜３のいずれか一項に記載の硬貨識別用磁気アレイセンサであって、前記共振回路順次駆動手段は、駆動させる共振回路の一端側を、所定時間電源に接続して当該共振回路を駆動させた後、グランドに接続して当該共振回路から振動減衰波を出力させることを特徴とする。
また、請求項５の発明は、請求項１〜４のいずれか一項に記載の硬貨識別用磁気アレイセンサであって、前記共振回路順次駆動手段は、隣接しない磁気ヘッドの共振回路を順次駆動させることを特徴とする。
The present invention has been created in order to solve these problems in view of the above circumstances, and the invention of claim 1 is arranged in a coin passage path through which a coin passes, and A coin identification magnetic array sensor for magnetically measuring an identification element, a plurality of magnetic heads arranged along a surface of a coin passing through the coin passage path, a coil wound around each magnetic head, A plurality of resonance circuits configured by connecting capacitors to the coils, resonance circuit sequential drive means for intermittently driving the resonance circuits in a predetermined order, and vibration attenuation waves output from the resonance circuits after driving Phase amplitude measuring means for measuring the phase and amplitude, and after measuring the phase and amplitude of the vibration attenuation wave, until one end of the resonance circuit is driven, Magnetic interference regulating means for regulating magnetic interference with other resonant circuits by connecting one end side or middle part of the oscillation circuit to a pull-down resistor, and phase measurement values and amplitude measurement values of vibration attenuation waves related to each resonance circuit Measurement value output means for outputting, the phase amplitude measurement means counts the number of vibration attenuation waves output from the resonance circuit after driving, and based on the time until the count number reaches a predetermined number It is characterized by measuring the phase of a vibration damping wave.
The invention according to claim 2 is the coin array magnetic array sensor according to claim 1, wherein the magnetic interference restricting means measures the phase and amplitude of the vibration attenuation wave, and then one end side of the resonance circuit. Alternatively, the intermediate portion is connected to a pull-down resistor to remove residual energy of the resonance circuit, and then one end side or the intermediate portion of the resonance circuit is opened.
Further, the invention according to claim 3 is the coin identification magnetic array sensor according to claim 1 or 2, wherein the resonance circuit sequential drive means is arranged at one end side of the resonance circuit or before driving the resonance circuit. An intermediate portion is connected to a ground or a pull-down resistor to remove an initial bias voltage of the resonance circuit.
According to a fourth aspect of the present invention, there is provided the coin identifying magnetic array sensor according to any one of the first to third aspects, wherein the resonance circuit sequential driving means has a predetermined end of the resonance circuit to be driven. The resonance circuit is driven by connecting to a time power supply, and then a vibration attenuation wave is output from the resonance circuit by connecting to a ground.
A fifth aspect of the present invention is the coin identification magnetic array sensor according to any one of the first to fourth aspects, wherein the resonance circuit sequential driving means sequentially drives the resonance circuits of magnetic heads that are not adjacent to each other. It is characterized by making it.
請求項１の発明によれば、複数の磁気ヘッドに巻装されたコイルにそれぞれコンデンサを接続して複数の共振回路を構成し、各共振回路を所定の順番で間欠的に駆動させ、駆動後に各共振回路から出力される振動減衰波の位相変化及び振幅変化を硬貨の識別に利用するので、硬貨の識別精度を飛躍的に高めることができる。すなわち、駆動後に各共振回路から出力される振動減衰波は、駆動信号に影響されることなく、通過する硬貨の磁気特性に応じた位相及び振幅で自由に振動するので、振動減衰波の位相変化及び振幅変化に基づいて硬貨の磁気特性を高精度に測定し、当該硬貨を高精度に識別することが可能になる。また、振動減衰波の位相及び振幅を測定した後、当該共振回路が次回駆動されるまでの間、当該共振回路と他の共振回路との磁気干渉を規制するので、磁気干渉に起因する測定精度の低下も回避できる。また、駆動後に共振回路から出力される振動減衰波の波数をカウントし、該カウント数が所定数に達するまでの時間に基づいて当該振動減衰波の位相を測定するので、高精度な位相測定が要求される場合は、カウント数を多くし、位相変化を蓄積してから測定する一方、応答性が優先される場合は、カウント数を少なくするなど、要求に応じて測定精度や応答性を容易に変更することが可能になる。
また、請求項２の発明によれば、振動減衰波の位相及び振幅を測定した後、当該共振回路の一端側又は中間部をプルダウン抵抗に接続させて当該共振回路の残留エネルギーを除去するので、残留エネルギーによる測定精度の低下を回避できる。
また、請求項３の発明によれば、共振回路を駆動させる前に、当該共振回路の一端側又は中間部をグランド又はプルダウン抵抗に接続させて当該共振回路の初期バイアス電圧を除去するので、初期バイアス電圧による測定精度の低下を回避できる。
また、請求項４の発明によれば、駆動させる共振回路の一端側を、所定時間電源に接続して当該共振回路を駆動させた後、グランドに接続して当該共振回路から振動減衰波を出力させるので、駆動用コイルを別途設ける必要がない。
また、請求項５の発明によれば、隣接しない磁気ヘッドの共振回路を順次駆動させるので、共振回路同士の磁気干渉をより確実に防止することが可能になる。
According to the first aspect of the present invention, a plurality of resonance circuits are formed by connecting capacitors to coils wound around a plurality of magnetic heads, and each resonance circuit is intermittently driven in a predetermined order. Since the phase change and amplitude change of the vibration attenuation wave output from each resonance circuit are used for the coin identification, the coin identification accuracy can be dramatically improved. That is, the vibration attenuation wave output from each resonance circuit after driving vibrates freely with a phase and amplitude corresponding to the magnetic characteristics of the passing coin without being influenced by the drive signal, so the phase change of the vibration attenuation wave In addition, the magnetic characteristics of the coin can be measured with high accuracy based on the amplitude change, and the coin can be identified with high accuracy. In addition, since the magnetic interference between the resonance circuit and another resonance circuit is regulated until the resonance circuit is driven next time after measuring the phase and amplitude of the vibration attenuation wave, the measurement accuracy caused by the magnetic interference is limited. It is possible to avoid the decrease of In addition, the number of vibration attenuation waves output from the resonance circuit after driving is counted, and the phase of the vibration attenuation waves is measured based on the time until the count reaches a predetermined number. When required, the number of counts is increased and measurement is performed after accumulating the phase change. On the other hand, when responsiveness is given priority, the number of counts is reduced, etc. It becomes possible to change to.
According to the invention of claim 2, after measuring the phase and amplitude of the vibration attenuation wave, the residual energy of the resonance circuit is removed by connecting one end side or the middle part of the resonance circuit to the pull-down resistor. A decrease in measurement accuracy due to residual energy can be avoided.
According to the invention of claim 3, before driving the resonance circuit, one end side or an intermediate portion of the resonance circuit is connected to the ground or the pull-down resistor to remove the initial bias voltage of the resonance circuit. A decrease in measurement accuracy due to the bias voltage can be avoided.
According to the invention of claim 4, one end of the resonance circuit to be driven is connected to a power source for a predetermined time to drive the resonance circuit, and then connected to the ground to output a vibration attenuation wave from the resonance circuit. Therefore, it is not necessary to provide a driving coil separately.
According to the fifth aspect of the present invention, since the resonance circuits of the magnetic heads that are not adjacent to each other are sequentially driven, it is possible to more reliably prevent magnetic interference between the resonance circuits.
以下、本発明の実施の形態について、図面に基づいて説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
［硬貨識別用磁気アレイセンサ］
図１は、本発明の実施形態に係る硬貨識別用磁気アレイセンサの構成を示すブロック図であり、図２の（ａ）は磁気ヘッドアレイの平面図、（ｂ）は磁気ヘッドアレイの正面図、（ｃ）は磁気ヘッドアレイの側面図である。
本発明の実施形態に係る硬貨識別用磁気アレイセンサ１は、硬貨２が通過する硬貨通過経路３に配置され、通過する硬貨２の識別要素を磁気的に測定するように構成される。磁気的に測定可能な硬貨２の識別要素としては、硬貨２の材質、直径、孔の有無、厚さ、表面形状などがあり、本実施形態では、硬貨２の材質、直径、孔の有無及び厚さを測定対象とする。
[Magnetic array sensor for coin recognition]
FIG. 1 is a block diagram showing a configuration of a coin identifying magnetic array sensor according to an embodiment of the present invention. FIG. 2A is a plan view of the magnetic head array, and FIG. 1B is a front view of the magnetic head array. (C) is a side view of a magnetic head array.
The magnetic array sensor 1 for coin identification according to the embodiment of the present invention is arranged in a coin passage path 3 through which a coin 2 passes, and is configured to magnetically measure an identification element of the coin 2 passing through. The identification element of the coin 2 that can be measured magnetically includes the material of the coin 2, the diameter, the presence or absence of a hole, the thickness, the surface shape, etc. In this embodiment, the material of the coin 2, the diameter, the presence or absence of a hole, Thickness is measured.
図１に示すように、本実施形態の硬貨識別用磁気アレイセンサ１は、硬貨通過経路３を通過する硬貨２の表面に沿って並ぶ複数の磁気ヘッド４と、各磁気ヘッド４に接続される複数の検出回路５と、複数の検出回路５に接続されるマイコン６とを備える。 As shown in FIG. 1, a coin identifying magnetic array sensor 1 of the present embodiment is connected to a plurality of magnetic heads 4 arranged along the surface of a coin 2 passing through a coin passage path 3, and to each magnetic head 4. A plurality of detection circuits 5 and a microcomputer 6 connected to the plurality of detection circuits 5 are provided.
［磁気ヘッドアレイ］
図２に示すように、硬貨通過経路３は、硬貨２の外周面が転がりながら接触する下面３ａと、その対向面である上面３ｂと、硬貨２の一方の表面が摺接する一側面３ｃと、その対向面である他側面３ｄとにより囲まれている。複数の磁気ヘッド４のうち、６つの磁気ヘッド４（ＣＨ１〜ＣＨ６）は、硬貨通過経路３の一側面３ｃに沿い、且つ、下面３ａ側から上面側３ｂに向かって並ぶように配置され、残り１つの磁気ヘッド４（ＣＨ７）は、硬貨通過経路３の他側面３ｄに沿い、且つ、下面３ａの近傍に位置するように配置される。
[Magnetic head array]
As shown in FIG. 2, the coin passage path 3 includes a lower surface 3 a that contacts the outer peripheral surface of the coin 2 while rolling, an upper surface 3 b that is an opposite surface thereof, and a side surface 3 c that is in sliding contact with one surface of the coin 2; It is surrounded by the other side surface 3d which is the opposite surface. Among the plurality of magnetic heads 4, six magnetic heads 4 (CH1 to CH6) are arranged along one side surface 3c of the coin passage path 3 and aligned from the lower surface 3a side to the upper surface side 3b, and the rest One magnetic head 4 (CH7) is disposed along the other side surface 3d of the coin passage path 3 and in the vicinity of the lower surface 3a.
ＣＨ１の磁気ヘッド４は、通過する硬貨２の中心線位置（磁気ヘッド４の配列中心線と硬貨２の中心線とが一致するタイミング）を検出するために設けられており、検出値のピーク位置が硬貨２の中心線位置であると判断される。そのためＣＨ１の磁気ヘッド４は、検出値の飽和を回避するために、硬貨通過経路３に対して略半分だけが対向するように配置される。 The CH1 magnetic head 4 is provided to detect the center line position of the passing coin 2 (the timing at which the arrangement center line of the magnetic head 4 coincides with the center line of the coin 2), and the peak position of the detected value. Is determined to be the center line position of the coin 2. Therefore, the CH1 magnetic head 4 is arranged so that only approximately half faces the coin passage path 3 in order to avoid saturation of the detected value.
ＣＨ２〜ＣＨ６の磁気ヘッド４は、硬貨２の材質、孔の有無及び直径を検出するために設けられており、例えば、ＣＨ２の磁気ヘッド４は、主に硬貨２の材質を検出し、ＣＨ３及びＣＨ４の磁気ヘッド４は、主に硬貨２の孔を検出し、ＣＨ５及びＣＨ６の磁気ヘッド４は、主に硬貨２の直径を検出する。 The magnetic heads 4 of CH2 to CH6 are provided for detecting the material of the coin 2, the presence / absence of a hole, and the diameter thereof. For example, the magnetic head 4 of CH2 mainly detects the material of the coin 2, The magnetic head 4 of CH4 mainly detects the hole of the coin 2, and the magnetic heads 4 of CH5 and CH6 mainly detect the diameter of the coin 2.
ＣＨ７の磁気ヘッド４は、硬貨２の厚さを検出するために設けられており、実際には硬貨２との距離を検出する。なお、ＣＨ７の磁気ヘッド４は、選択的に追加されるオプションであり、要求される硬貨識別精度が高い場合に追加される。 The magnetic head 4 of CH7 is provided for detecting the thickness of the coin 2, and actually detects the distance from the coin 2. The CH7 magnetic head 4 is an option that is selectively added, and is added when the required coin identification accuracy is high.
各磁気ヘッド４は、フェライト、パーマロイなどで形成されるコア４ａにコイル４ｂを巻装して構成されている。コア４ａの材質、形状、コイル４ｂの径、巻数などは、本発明において限定されず、硬貨２の識別用として適正であればよい。例えば、小型でコイル巻数が多いチップインダクタ（巻線タイプ）を磁気ヘッド４として用いることができる。 Each magnetic head 4 is configured by winding a coil 4b around a core 4a formed of ferrite, permalloy or the like. The material and shape of the core 4a, the diameter of the coil 4b, the number of turns, and the like are not limited in the present invention, and may be appropriate as long as the coin 2 is identified. For example, a small chip inductor (winding type) having a large number of coil turns can be used as the magnetic head 4.
なお、本実施形態では、後述するようにコイル４ｂを所定時間電源ＶＣＣに接続して駆動させるが、コア４ａに駆動用コイルを別途巻装し、コア４ａを介した電磁誘導でコイル４ｂを駆動させてもよい。ただし、この場合には、コイル本数が増えるだけでなく、駆動用コイルの空間確保によってコイル４ｂの巻数が減少するため、磁気ヘッド４のコストが上昇したり検出精度が低下する虞がある。 In this embodiment, as will be described later, the coil 4b is connected to the power supply VCC for driving for a predetermined time. However, a driving coil is separately wound around the core 4a, and the coil 4b is driven by electromagnetic induction via the core 4a. You may let them. However, in this case, not only the number of coils is increased, but also the number of turns of the coil 4b is reduced by securing the space for the driving coil, so that the cost of the magnetic head 4 may be increased and the detection accuracy may be decreased.
［検出回路］
図３は、検出回路の回路図である。
図３に示すように、磁気ヘッド４毎に設けられる各検出回路５は、磁気ヘッド４のコイル４ｂにコンデンサＣを直列接続して構成される共振回路７を備える。共振回路７の一端側は、マイコン６でＯＮ／ＯＦＦされるスイッチ素子８、９、１０を介して、電源ＶＣＣ、プルダウン抵抗１１又はグランドに選択的に接続され、共振回路７の他端側は、グランドに接続され、共振回路７の中間部は、マイコン６の入力ポートに接続されている。
[Detection circuit]
FIG. 3 is a circuit diagram of the detection circuit.
As shown in FIG. 3, each detection circuit 5 provided for each magnetic head 4 includes a resonance circuit 7 configured by connecting a capacitor C in series to a coil 4 b of the magnetic head 4. One end side of the resonance circuit 7 is selectively connected to the power supply VCC, the pull-down resistor 11 or the ground via the switch elements 8, 9, 10 which are turned on / off by the microcomputer 6, and the other end side of the resonance circuit 7 is The intermediate portion of the resonance circuit 7 is connected to the input port of the microcomputer 6.
［測定原理］
図４は、磁気ヘッドの駆動順序を示すタイミングチャート、図５は、測定原理を説明するための波形図である。
マイコン６は、予めＲＯＭに書き込まれるプログラムとの協働により実現される機能的な構成として、共振回路順次駆動手段と、位相振幅測定手段と、磁気干渉規制手段と、測定値出力手段とを備える。
[Measurement principle]
FIG. 4 is a timing chart showing the driving order of the magnetic head, and FIG. 5 is a waveform diagram for explaining the measurement principle.
The microcomputer 6 includes a resonance circuit sequential drive unit, a phase amplitude measurement unit, a magnetic interference regulation unit, and a measurement value output unit as a functional configuration realized by cooperation with a program written in the ROM in advance. .
共振回路順次駆動手段は、各共振回路７を所定の順番で間欠的に駆動させる。位相振幅測定手段は、駆動後に各共振回路７から出力される振動減衰波の位相及び振幅を測定する。磁気干渉規制手段は、振動減衰波の位相及び振幅を測定した後、当該共振回路７が次回駆動されるまでの間、当該共振回路７と他の共振回路７との磁気干渉を規制する。測定値出力手段は、各共振回路７に係る振動減衰波の位相測定値及び振幅測定値を出力する。そして、出力された位相測定値及び振幅測定値に基づいて硬貨２の識別が行われる。以下、各手段について詳細に説明する。 The resonance circuit sequential driving means drives each resonance circuit 7 intermittently in a predetermined order. The phase amplitude measuring means measures the phase and amplitude of the vibration damping wave output from each resonance circuit 7 after driving. The magnetic interference regulating means regulates magnetic interference between the resonance circuit 7 and the other resonance circuit 7 until the resonance circuit 7 is driven next time after measuring the phase and amplitude of the vibration attenuation wave. The measurement value output means outputs the phase measurement value and the amplitude measurement value of the vibration attenuation wave related to each resonance circuit 7. Then, the coin 2 is identified based on the output phase measurement value and amplitude measurement value. Hereinafter, each means will be described in detail.
［共振回路順次駆動手段］
共振回路順次駆動手段は、駆動させる共振回路７の一端側を、所定時間電源ＶＣＣに接続して当該共振回路７を駆動させた後、グランドに接続して当該共振回路７から振動減衰波を出力させる。具体的には、駆動させる共振回路７の一端側を、スイッチ素子８を所定時間ＯＮにすることにより（図５の区間ｂ）、所定時間電源ＶＣＣに接続させた後、スイッチ素子９をＯＮにすることにより（図５の区間ｃ）、グランドに接続させる。
[Resonant circuit sequential drive means]
The resonance circuit sequential drive means connects one end of the resonance circuit 7 to be driven to the power supply VCC for a predetermined time to drive the resonance circuit 7 and then connects to the ground to output a vibration attenuation wave from the resonance circuit 7. Let Specifically, one end side of the resonance circuit 7 to be driven is connected to the power source VCC for a predetermined time by turning the switch element 8 ON for a predetermined time (section b in FIG. 5), and then the switch element 9 is turned ON. By doing so (section c in FIG. 5), it is connected to the ground.
共振回路順次駆動手段は、共振回路７を駆動させる前に、当該共振回路７の一端側をグランドに接続させて当該共振回路７の初期バイアス電圧を除去する。具体的には、駆動させる共振回路７の一端側を、スイッチ素子９を所定時間ＯＮにすることにより（図５の区間ａ）、グランドに接続させる。なお、初期バイアス電圧は、駆動させる共振回路７の一端側をプルダウン抵抗１１に接続して除去したり、駆動させる共振回路７の中間部をグランドやプルダウン抵抗１１に接続して除去してもよい。 The resonance circuit sequential drive means removes the initial bias voltage of the resonance circuit 7 by connecting one end side of the resonance circuit 7 to the ground before driving the resonance circuit 7. Specifically, one end side of the resonance circuit 7 to be driven is connected to the ground by turning on the switch element 9 for a predetermined time (section a in FIG. 5). Note that the initial bias voltage may be removed by connecting one end of the driven resonance circuit 7 to the pull-down resistor 11, or removing an intermediate portion of the driven resonance circuit 7 by connecting to the ground or the pull-down resistor 11. .
共振回路順次駆動手段は、隣接しない磁気ヘッド４の共振回路７を順次駆動させる。例えば、本実施形態では、図４に示すように、ＣＨ１→ＣＨ３→ＣＨ５→ＣＨ７→ＣＨ４→ＣＨ２→ＣＨ６の順番で駆動させることにより、隣接する磁気ヘッド４間の磁気干渉を防止している。 The resonance circuit sequential driving means sequentially drives the resonance circuits 7 of the magnetic heads 4 that are not adjacent to each other. For example, in this embodiment, as shown in FIG. 4, magnetic interference between adjacent magnetic heads 4 is prevented by driving in the order of CH 1 → CH 3 → CH 5 → CH 7 → CH 4 → CH 2 → CH 6.
［位相振幅測定手段］
位相振幅測定手段は、駆動後に共振回路７から出力される振動減衰波の波数をカウントし、該カウント数が所定数に達するまでの時間に基づいて当該振動減衰波の位相Ａを測定する。例えば、本実施形態では、図５に示すように、駆動後に共振回路７から出力される振動減衰波が３に達するまでの時間に基づいて当該振動減衰波の位相Ａを測定している。なお、振動減衰波の振幅測定は、任意の測定方法を用いることができる。例えば、デジタル又はアナログ的なピークホールド処理を行い、該処理により取得されるピーク値に基づいて振幅Ｂを特定する。
[Phase amplitude measurement means]
The phase amplitude measuring means counts the wave number of the vibration attenuation wave output from the resonance circuit 7 after driving, and measures the phase A of the vibration attenuation wave based on the time until the count number reaches a predetermined number. For example, in this embodiment, as shown in FIG. 5, the phase A of the vibration attenuation wave is measured based on the time until the vibration attenuation wave output from the resonance circuit 7 reaches 3 after driving. In addition, arbitrary measurement methods can be used for the amplitude measurement of the vibration attenuation wave. For example, digital or analog peak hold processing is performed, and the amplitude B is specified based on the peak value acquired by the processing.
［磁気干渉規制手段］
磁気干渉規制手段は、振動減衰波の位相及び振幅を測定した後、当該共振回路７が次回駆動されるまでの間、当該共振回路７の一端側を開放させることで他の共振回路７との磁気干渉を規制する。具体的には、共振回路７の一端側を、すべてのスイッチ素子８、９、１０をＯＦＦにすることにより（図５の区間ｅ）、開放させる。なお、このような磁気干渉規制は、共振回路７の一端側又は中間部をプルダウン抵抗１１に接続したり、共振回路７の中間部を開放しても可能である。
[Magnetic interference regulating means]
After measuring the phase and amplitude of the vibration attenuation wave, the magnetic interference regulating means opens one end side of the resonance circuit 7 until the resonance circuit 7 is driven next time, so that the resonance circuit 7 and the other resonance circuit 7 are opened. Regulate magnetic interference. Specifically, one end side of the resonance circuit 7 is opened by turning off all the switch elements 8, 9, and 10 (section e in FIG. 5). Such magnetic interference regulation can be performed even if one end side or an intermediate portion of the resonance circuit 7 is connected to the pull-down resistor 11 or the intermediate portion of the resonance circuit 7 is opened.
磁気干渉規制手段は、振動減衰波の位相及び振幅を測定した後、当該共振回路７の一端側をプルダウン抵抗１１に接続させて当該共振回路７の残留エネルギーを除去し、その後、当該共振回路７の一端側を開放させる。具体的には、共振回路７の一端側を、スイッチ素子１０を所定時間ＯＮにすることにより（図５の区間ｄ）、プルダウン抵抗１１に接続させ、その後、すべてのスイッチ素子８、９、１０をＯＦＦにすることにより（図５の区間ｅ）、開放させる。 After measuring the phase and amplitude of the vibration attenuation wave, the magnetic interference restricting means connects one end of the resonance circuit 7 to the pull-down resistor 11 to remove the residual energy of the resonance circuit 7, and then the resonance circuit 7. Open one end side of. Specifically, one end side of the resonance circuit 7 is connected to the pull-down resistor 11 by turning on the switch element 10 for a predetermined time (section d in FIG. 5), and thereafter, all the switch elements 8, 9, 10 are connected. Is turned off (section e in FIG. 5).
［マイコンの処理手順］
つぎに、上記のような各種手段を実現するマイコン６の処理手順について、図６〜図８を参照して説明する。
[Microcomputer processing procedure]
Next, the processing procedure of the microcomputer 6 for realizing the various means as described above will be described with reference to FIGS.
図６は、メインルーチンを示すフローチャートである。
図６に示すように、マイコン６は、起動時に初期設定を実行した後（Ｓ１１）、以下に示すループ処理を実行する。
FIG. 6 is a flowchart showing the main routine.
As shown in FIG. 6, the microcomputer 6 executes the following loop processing after executing the initial setting at the time of startup (S11).
マイコン６は、ループ処理の最初に、チャンネル（ＣＨ）の番号Ｍをセットする（Ｓ１２：共振回路順次駆動手段）。これは、図４に示す駆動順序にしたがって行われる。つぎに、Ｍチャンネルの共振回路７の一端側を所定時間グランドに接続した後（Ｓ１３：共振回路順次駆動手段）、Ｍチャンネルの共振回路７の一端側を所定時間電源ＶＣＣに接続し（Ｓ１４：共振回路順次駆動手段）、その後、Ｍチャンネルの共振回路７の一端側をグランドに接続させる（Ｓ１５：共振回路順次駆動手段）。これにより、Ｍチャンネルの共振回路７から共振減衰波が出力され、マイコン６に入力される。 The microcomputer 6 sets the number M of the channel (CH) at the beginning of the loop processing (S12: resonance circuit sequential drive means). This is performed according to the driving sequence shown in FIG. Next, after one end of the M-channel resonance circuit 7 is connected to the ground for a predetermined time (S13: resonance circuit sequential driving means), one end of the M-channel resonance circuit 7 is connected to the power supply VCC for a predetermined time (S14: Resonance circuit sequential drive means), and then, one end of the M-channel resonance circuit 7 is connected to the ground (S15: resonance circuit sequential drive means). As a result, a resonance attenuation wave is output from the M-channel resonance circuit 7 and input to the microcomputer 6.
マイコン６は、Ｍチャンネルの共振回路７から出力される共振減衰波の位相測定及び振幅測定を行う（Ｓ１６、Ｓ１７：位相振幅測定手段）。その具体的な測定処理手順は後述する。位相測定及び振幅測定が終了したら（Ｓ１８）、Ｍチャンネルの共振回路７の一端側を所定時間プルダウン抵抗１１に接続させた後（Ｓ１９：磁気干渉規制手段）、Ｍチャンネルの共振回路７の一端側を開放させる（Ｓ２０：磁気干渉規制手段）。これにより、１チャンネル分の測定処理が終わり、これをチャンネル番号を変更しながら、すべてのチャンネルに対して実行する。そして、すべてのチャンネルの測定が終了したら（Ｓ２１）、全チャンネルの位相測定値及び振幅測定信号をマイコン６から出力するとともに（Ｓ２２：測定値出力手段）、チャンネル番号Ｍ及び測定値をクリアしてループ処理の先頭（Ｓ１２）に戻る（Ｓ２３）。 The microcomputer 6 performs phase measurement and amplitude measurement of the resonance attenuation wave output from the M-channel resonance circuit 7 (S16, S17: phase amplitude measurement means). The specific measurement processing procedure will be described later. When the phase measurement and the amplitude measurement are completed (S18), one end side of the M-channel resonance circuit 7 is connected to the pull-down resistor 11 for a predetermined time (S19: magnetic interference regulating means), and then one end side of the M-channel resonance circuit 7 Is opened (S20: magnetic interference regulating means). As a result, the measurement processing for one channel is completed, and this is executed for all channels while changing the channel number. When measurement of all channels is completed (S21), the phase measurement values and amplitude measurement signals of all channels are output from the microcomputer 6 (S22: measurement value output means), and the channel number M and measurement values are cleared. Return to the top of the loop process (S12) (S23).
図７は、位相測定ルーチンを示すフローチャートである。
位相測定では、まず、測定開始（振動減衰波の１波目入力）か否かを判断し（Ｓ３１）、この判断結果がＹＥＳの場合は、時間計測タイマをセットする（Ｓ３２）。タイマセット後は、振動減衰波の波数をカウントするとともに（Ｓ３３）、カウント波数が所定数Ｎ（本実施形態では３）に達したか否かを判断する（Ｓ３４）。この判断結果がＮＯのあいだは振動減衰波の波数カウントを継続するが、カウント波数が所定数Ｎになったら、時間計測タイマ値を取得するとともに（Ｓ３５）、取得したタイマ値を位相測定値にセットし（Ｓ３６）、その後、カウント波数及びタイマをクリアして測定終了とする（Ｓ３７）。
FIG. 7 is a flowchart showing a phase measurement routine.
In the phase measurement, first, it is determined whether or not measurement is started (input of the first wave of vibration attenuation wave) (S31). If the determination result is YES, a time measurement timer is set (S32). After the timer is set, the wave number of the vibration attenuation wave is counted (S33), and it is determined whether the count wave number has reached a predetermined number N (3 in the present embodiment) (S34). While the determination result is NO, the wave count of the vibration attenuation wave is continued. When the count wave number reaches the predetermined number N, the time measurement timer value is acquired (S35), and the acquired timer value is set as the phase measurement value. Then, the count wave number and the timer are cleared and the measurement is completed (S37).
図８は、振幅測定ルーチンを示すフローチャートである。
振幅測定では、カウント波数が（Ｎ−１）に達したか否かを判断し（Ｓ４１）、この判断結果がＹＥＳの場合は、振動減衰波のピークホールド処理を開始する（Ｓ４２）。さらに、カウント波数がＮに達したか否かを判断し（Ｓ４３）、この判断結果がＹＥＳになったら、ピーク値を取得し（Ｓ４４）、これを振幅測定値にセットする（Ｓ４５）。
FIG. 8 is a flowchart showing an amplitude measurement routine.
In the amplitude measurement, it is determined whether or not the count wave number has reached (N-1) (S41). If the determination result is YES, peak hold processing of the vibration attenuation wave is started (S42). Further, it is determined whether or not the counted wave number has reached N (S43). If the determination result is YES, a peak value is acquired (S44), and this is set as an amplitude measurement value (S45).
叙述の如く構成された本実施形態によれば、硬貨２が通過する硬貨通過経路３に配置され、通過する硬貨２の識別要素を磁気的に測定する硬貨識別用磁気アレイセンサ１であって、硬貨通過経路３を通過する硬貨３の表面に沿って並ぶ複数の磁気ヘッド４と、各磁気ヘッド４に巻装されたコイル４ｂと、各コイル４ｂにそれぞれコンデンサＣを接続して構成される複数の共振回路７と、各共振回路７を所定の順番で間欠的に駆動させる共振回路順次駆動手段と、駆動後に各共振回路７から出力される振動減衰波の位相及び振幅を測定する位相振幅測定手段と、振動減衰波の位相及び振幅を測定した後、当該共振回路７が次回駆動されるまでの間、当該共振回路７の一端側又は中間部を開放、又は当該共振回路７の一端側又は中間部をプルダウン抵抗１１に接続させることで他の共振回路７との磁気干渉を規制する磁気干渉規制手段と、各共振回路７に係る振動減衰波の位相測定値及び振幅測定値を出力する測定値出力手段と、を備え、位相振幅測定手段は、駆動後に共振回路７から出力される振動減衰波の波数をカウントし、該カウント数が所定数に達するまでの時間に基づいて当該振動減衰波の位相を測定する。 According to the present embodiment configured as described, the coin identification magnetic array sensor 1 is disposed in the coin passage path 3 through which the coin 2 passes and magnetically measures the identification element of the coin 2 passing therethrough, A plurality of magnetic heads 4 arranged along the surface of the coin 3 passing through the coin passage path 3, coils 4b wound around the magnetic heads 4, and a plurality of capacitors Cb connected to the coils 4b. Resonance circuit 7, resonance circuit sequential driving means for intermittently driving each resonance circuit 7 in a predetermined order, and phase amplitude measurement for measuring the phase and amplitude of the vibration attenuation wave output from each resonance circuit 7 after driving After measuring the phase and amplitude of the vibration attenuation wave, the one end side or the middle part of the resonance circuit 7 is opened, or one end side of the resonance circuit 7 or until the resonance circuit 7 is driven next time. Pull down the middle Magnetic interference restriction means for restricting magnetic interference with the other resonance circuit 7 by connecting to the resistor 11, and measurement value output means for outputting the phase measurement value and the amplitude measurement value of the vibration attenuation wave related to each resonance circuit 7. The phase amplitude measuring means counts the number of vibration attenuation waves output from the resonance circuit 7 after driving, and measures the phase of the vibration attenuation waves based on the time until the count reaches a predetermined number. To do.
このような硬貨識別用磁気アレイセンサ１によれば、複数の磁気ヘッド４に巻装されたコイル４ｂにそれぞれコンデンサＣを接続して複数の共振回路７を構成し、各共振回路７を所定の順番で間欠的に駆動させ、駆動後に各共振回路７から出力される振動減衰波の位相変化及び振幅変化を硬貨２の識別に利用するので、硬貨２の識別精度を飛躍的に高めることができる。すなわち、駆動後に各共振回路７から出力される振動減衰波は、駆動信号に影響されることなく、通過する硬貨２の磁気特性に応じた位相及び振幅で自由に振動するので、振動減衰波の位相変化及び振幅変化に基づいて硬貨２の磁気特性を高精度に測定し、当該硬貨２を高精度に識別することが可能になる。 According to such a coin identifying magnetic array sensor 1, a plurality of resonance circuits 7 are configured by connecting capacitors C to coils 4 b wound around a plurality of magnetic heads 4, respectively. Since it is driven intermittently in order and the phase change and amplitude change of the vibration attenuation wave output from each resonance circuit 7 after driving are used for identifying the coin 2, the identification accuracy of the coin 2 can be dramatically increased. . That is, the vibration attenuation wave output from each resonance circuit 7 after driving freely vibrates with the phase and amplitude corresponding to the magnetic characteristics of the passing coin 2 without being influenced by the drive signal. Based on the phase change and the amplitude change, the magnetic property of the coin 2 can be measured with high accuracy, and the coin 2 can be identified with high accuracy.
また、振動減衰波の位相及び振幅を測定した後、当該共振回路７が次回駆動されるまでの間、当該共振回路７と他の共振回路７との磁気干渉を規制するので、磁気干渉に起因する測定精度の低下も回避できる。 Further, since the magnetic interference between the resonance circuit 7 and the other resonance circuit 7 is regulated until the resonance circuit 7 is driven next time after measuring the phase and amplitude of the vibration attenuation wave, it is caused by the magnetic interference. It is possible to avoid a decrease in measurement accuracy.
また、駆動後に共振回路７から出力される振動減衰波の波数をカウントし、該カウント数が所定数に達するまでの時間に基づいて当該振動減衰波の位相を測定するので、高精度な位相測定が要求される場合は、カウント数を多くし、位相変化を蓄積してから測定する一方、応答性が優先される場合は、カウント数を少なくするなど、要求に応じて測定精度や応答性を容易に変更することが可能になる。 In addition, the number of vibration attenuation waves output from the resonance circuit 7 after driving is counted, and the phase of the vibration attenuation waves is measured based on the time until the count reaches a predetermined number. When the measurement is required, increase the number of counts and measure after accumulating the phase change, while when priority is given to responsiveness, reduce the number of counts. It can be changed easily.
また、磁気干渉規制手段は、振動減衰波の位相及び振幅を測定した後、当該共振回路の一端側又は中間部をプルダウン抵抗１１に接続させて当該共振回路７の残留エネルギーを除去し、その後、当該共振回路７の一端側又は中間部を開放させるので、残留エネルギーによる測定精度の低下を回避できる。 The magnetic interference regulating means measures the phase and amplitude of the vibration attenuation wave, and then connects the one end side or the middle part of the resonance circuit to the pull-down resistor 11 to remove the residual energy of the resonance circuit 7, and then Since one end side or the middle part of the resonance circuit 7 is opened, it is possible to avoid a decrease in measurement accuracy due to residual energy.
また、共振回路順次駆動手段は、共振回路７を駆動させる前に、当該共振回路７の一端側又は中間部をグランド又はプルダウン抵抗１１に接続させて当該共振回路７の初期バイアス電圧を除去するので、初期バイアス電圧による測定精度の低下を回避できる。 Further, the resonance circuit sequential drive means removes the initial bias voltage of the resonance circuit 7 by connecting one end side or an intermediate portion of the resonance circuit 7 to the ground or the pull-down resistor 11 before driving the resonance circuit 7. Therefore, it is possible to avoid a decrease in measurement accuracy due to the initial bias voltage.
また、共振回路順次駆動手段は、駆動させる共振回路７の一端側を、所定時間電源ＶＣＣに接続して当該共振回路７を駆動させた後、グランドに接続して当該共振回路７から振動減衰波を出力させるので、駆動用コイルを別途設ける必要がない。 The resonance circuit sequential driving means connects one end of the resonance circuit 7 to be driven to the power supply VCC for a predetermined time to drive the resonance circuit 7, and then connects to the ground to transmit a vibration attenuation wave from the resonance circuit 7. Therefore, it is not necessary to provide a driving coil separately.
また、共振回路順次駆動手段は、隣接しない磁気ヘッド４の共振回路７を順次駆動させるので、共振回路７同士の磁気干渉をより確実に防止することが可能になる。 Further, since the resonance circuit sequential driving means sequentially drives the resonance circuits 7 of the magnetic heads 4 that are not adjacent to each other, it is possible to more reliably prevent magnetic interference between the resonance circuits 7.
１ 硬貨識別用磁気アレイセンサ
２ 硬貨
３ 硬貨通過経路
４ 磁気ヘッド
４ａ コア
４ｂ コイル
５ 検出回路
６ マイコン
７ 共振回路
８〜１０ スイッチ素子
１１ プルダウン抵抗
DESCRIPTION OF SYMBOLS 1 Coin identification magnetic array sensor 2 Coin 3 Coin passage path 4 Magnetic head 4a Core 4b Coil 5 Detection circuit 6 Microcomputer 7 Resonance circuit 8-10 Switch element 11 Pull-down resistance
Claims (5)
前記硬貨通過経路を通過する硬貨の表面に沿って並ぶ複数の磁気ヘッドと、
各磁気ヘッドに巻装されたコイルと、
各コイルにそれぞれコンデンサを接続して構成される複数の共振回路と、
各共振回路を所定の順番で間欠的に駆動させる共振回路順次駆動手段と、
駆動後に各共振回路から出力される振動減衰波の位相及び振幅を測定する位相振幅測定手段と、
振動減衰波の位相及び振幅を測定した後、当該共振回路が次回駆動されるまでの間、当該共振回路の一端側又は中間部を開放、又は当該共振回路の一端側又は中間部をプルダウン抵抗に接続させることで他の共振回路との磁気干渉を規制する磁気干渉規制手段と、
各共振回路に係る振動減衰波の位相測定値及び振幅測定値を出力する測定値出力手段と、を備え、
前記位相振幅測定手段は、駆動後に共振回路から出力される振動減衰波の波数をカウントし、該カウント数が所定数に達するまでの時間に基づいて当該振動減衰波の位相を測定することを特徴とする硬貨識別用磁気アレイセンサ。 A coin identification magnetic array sensor that is arranged in a coin passage path through which a coin passes and that magnetically measures an identification element of the passing coin,
A plurality of magnetic heads arranged along the surface of the coin passing through the coin passage path;
A coil wound around each magnetic head;
A plurality of resonant circuits configured by connecting a capacitor to each coil;
Resonance circuit sequential drive means for intermittently driving each resonance circuit in a predetermined order;
Phase amplitude measuring means for measuring the phase and amplitude of the vibration damping wave output from each resonance circuit after driving;
After measuring the phase and amplitude of the vibration attenuation wave, until one end of the resonance circuit is driven next time, open one end side or the middle part of the resonance circuit, or use one end side or the middle part of the resonance circuit as a pull-down resistor. Magnetic interference regulating means for regulating magnetic interference with other resonant circuits by connecting;
A measurement value output means for outputting a phase measurement value and an amplitude measurement value of the vibration attenuation wave according to each resonance circuit,
The phase amplitude measuring means counts the number of vibration attenuation waves output from the resonance circuit after driving, and measures the phase of the vibration attenuation waves based on the time until the count reaches a predetermined number. Magnetic array sensor for coin identification.
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| JP2002269615A (en) * | 2001-03-09 | 2002-09-20 | Canon Electronics Inc | Coin identification device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018180899A1 (en) * | 2017-03-29 | 2018-10-04 | グローリー株式会社 | Magnetism detection apparatus, coin identification apparatus, and magnetism detection method of magnetism detection apparatus |
| JP2018169724A (en) * | 2017-03-29 | 2018-11-01 | グローリー株式会社 | Magnetic detection device, coin identification device, and magnetic detection method using magnetic detection device |
| US11205315B2 (en) | 2017-03-29 | 2021-12-21 | Glory Ltd. | Magnetism detection device, coin recognition device, and method for detecting magnetism using magnetism detection device |
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