JP3713979B2 - Coin identification device - Google Patents

Coin identification device Download PDF

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Publication number
JP3713979B2
JP3713979B2 JP27494198A JP27494198A JP3713979B2 JP 3713979 B2 JP3713979 B2 JP 3713979B2 JP 27494198 A JP27494198 A JP 27494198A JP 27494198 A JP27494198 A JP 27494198A JP 3713979 B2 JP3713979 B2 JP 3713979B2
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JP
Japan
Prior art keywords
coin
sensor
time
thickness
output
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JP27494198A
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Japanese (ja)
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JP2000105846A (en
Inventor
武彦 南良
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Corp
Panasonic Holdings Corp
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Panasonic Corp
Matsushita Electric Industrial Co Ltd
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Priority to JP27494198A priority Critical patent/JP3713979B2/en
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Description

【0001】
【発明の属する技術分野】
本発明は、硬貨の正偽および種類を電気的に識別する硬貨識別装置に関するものである。
【0002】
【従来の技術】
近年、自動販売機が普及し、これに使用される硬貨識別装置には高い識別性能が要求されている。
【0003】
従来、この種の硬貨識別装置は、硬貨の入口と、この投入口に連結された硬貨通路と、この硬貨通路の側壁に配置されたセンサと、このセンサの出力から投入された硬貨の特徴を検知する検知手段と、硬貨の正偽及び硬貨の種類の基準となるデータがあらかじめ記憶された記憶回路と、前記検知手段の出力と前記記憶回路のデータとを比較する比較回路と、この比較回路の比較結果により硬貨の正偽及び種類を判定する判定回路とを備えていた。センサとしては材質、厚み、外径センサを備え、検知手段としては各センサの出力の極大値や極小値を検知する手段を備えていた。そして、硬貨通路時の各センサの出力の極大値や極小値により硬貨の材質、厚み、外径を検知して識別を行っていた。
【0004】
【発明が解決しようとする課題】
しかしながらこのような従来の構成では、硬貨の特徴として検知していたのは硬貨特性の極大値や極小値だけであった。すなわち、厚みセンサの場合であれば、最大厚みや最小厚みのみであった。
【0005】
このため、硬貨特性が極大或いは極小となる位置は、正貨と差があるが、硬貨特性の極大値がほぼ等しい偽貨を不正使用されることがあった。例えば最も厚い部分の位置は正貨と異なるが、その部分の厚みがほぼ等しい類似外国硬貨などは排除できなかった。
【0006】
本発明は、このような偽貨の不正使用を防止することが可能な硬貨識別装置を提供することを目的とするものである。
【0007】
【課題を解決するための手段】
この課題を解決するために本発明の硬貨識別装置は、位置検出手段は、前記センサの出力波形から、前記硬貨の中央が前記センサを通過する第1の時刻と、前記センサの出力波形が極大となった第2の時刻とを検出し、前記第1の時刻と前記第2の時刻との差によって硬貨の厚みが極大となる位置を中央からの離れ度合いとして求める構成としたものである。そのため、硬貨の最大厚みが正貨とほぼ等しいが、硬貨の厚みが極大となる位置が異なる偽貨の不正使用を防止することが可能になる。
【0008】
【発明の実施の形態】
以下、本発明の実施の形態について、図1から図4を用いて説明する。
【0009】
図2は本発明の一実施の形態における硬貨識別装置の概要を示した構成図である。図2において、硬貨識別装置本体1の上部には硬貨の投入口2が設けられており、この投入口2から下方に向かって硬貨の通路3が連結されている。通路3の側壁には厚み・材質兼用センサ4と外径センサ5が配置されている。また通路3は硬貨識別装置本体1の下部に位置する硬貨の出口6に連結されている。
【0010】
図1は本実施の形態における硬貨識別装置の制御回路の構成を示すブロック図である。図1において、厚みセンサ7は通路3の側壁に対向して配置された2個のコアと、これらのコアの内部に巻回されたコイルと、これらのコイルで形成する発振回路、及び発振波形を正弦波から発振レベルを示す信号に変換する整流回路により構成されている。厚みセンサ7では、対向するコアに巻回されたコイルは相互インダクタンスが負になるように直列逆相接続され、その出力は厚みの極大値を検知する第1の極大値検知手段9、厚みが極大となる回数を検知する回数検知手段10、及び厚みが極大となる位置を検知する位置検知手段11に入る。
【0011】
材質センサ8も厚みセンサ7と同様の構成であるが、対向するコアに巻回されたコイルは相互インダクタンスが正になるように直列同相接続され、その出力は厚みが極大となる位置を検知する位置検知手段11、材質の極大値を検知する第2の極大値検知手段12、及び材質が極小となる幅を検知する幅検知手段13に入る。なお、本実施の形態では、厚みセンサ7と材質センサ8とでコアを兼用しており、図2に厚み・材質兼用センサ4として示している。
【0012】
外径センサ5も材質センサ8と同様の構成で、コイルは直列同相接続され、出力は外径の極大値を検知する第3の極大値検知手段14に入る。各検知手段9〜14の出力はそれぞれ、比較回路15〜20に入る。比較回路15〜20は記憶回路21にも接続されている。比較回路15〜20の各出力は判定回路22に入り、判定回路22は判定信号23を出力する。
【0013】
以上のように構成された硬貨識別装置について、以下にその動作を説明する。投入口2から投入された硬貨がセンサ4,5に近づくと、コイルのインピーダンスが変化し、それにつれて発振回路の発振レベルが変化する。この変化量は、厚みセンサ7では主に硬貨の厚みによって、材質センサ8では主に硬貨の材質によって、外径センサ5では主に硬貨の外径によって異なるように形成されている。これらのセンサ内に設けられた整流回路ではそれぞれ、発振回路の発振波形を正弦波から発振レベルを示す信号に変換する。各極大値検知手段9,12,14では、硬貨通過時の発振レベルの変化量の最初の極大値を検知して、それぞれ対応する比較回路15,18,20に出力する。
【0014】
次に、回数検知手段10と位置検知手段11の動作を図3を用いて説明する。図3は硬貨通過時の厚みセンサ7の出力波形30,40を示す。縦軸が発振レベルの変化量で、横軸が時刻である。図3中の実線波形は日本の五百円硬貨の波形30である。それに対して、破線波形は材質、外径及び最大の厚みが五百円硬貨とほぼ等しく、厚みが極大となる回数及び位置に差がある第1の偽貨の波形40である。これらの波形30,40の違いは次の理由による。五百円硬貨は外周部が最も厚く、中央部の凹凸度合いが比較的小さくて厚みが均一に近いのに対し、第1の偽貨は中央部が最も厚くて外周部より厚いためである。本発明はこれらの違いを、回数検知手段10及び位置検知手段11により、厚みが極大となる回数及び位置の差として検知しようとするものである。
【0015】
本実施の形態では厚みセンサ7の出力が極大値31から一定値33を減じた値をしきい値32とし、厚みセンサ7の出力がしきい値32以上となる部分の回数と位置を検知している。このようにして検知した厚みが極大となる回数は図3の場合、五百円の波形30の2回に対して、第1の偽貨の波形40では1回となる。回数検知手段10は、この回数を示す信号を比較回路16に出力する。
【0016】
また、本実施の形態の位置検知手段11では、厚みが極大となる位置を硬貨の中央からの離れ度合いとして求めている。まず、厚みセンサ7の出力がしきい値32に一致する最初の時刻34,44と最後の時刻35,45を検出する。並行して後述の方法で、硬貨の中央が厚み・材質兼用センサ4を通過する時刻77を検出する。そして、中央の時刻77と最初の時刻34,44との時刻差36,46、及び中央の時刻77と最後の時刻35,45との時刻差37,47を求め、大きい方の時刻差36,47を選択する。このような検知方法としているのは、五百円は外周部が最も厚いのに対して第1の偽貨は中央部が最も厚いという差を顕著にとらえるためである。なお、材質センサ8の出力波形50は、五百円と第1の偽貨では図4に示すようにほぼ同じ波形となる。
【0017】
このようにして求められた時刻差36,47は明らかに硬貨の通過速度の影響を受けるため、通過速度の補正を行う必要がある。本実施の形態では図4に示すように、硬貨の通過速度に比例していると考えられる、材質センサ8の出力が極大となる2つの時刻74,75の時刻差76を利用している。位置検知手段11は、厚みの極大と中央との時刻差36,47を材質の2つの極大の時刻差76で割った値を示す信号を比較回路17に出力する。
【0018】
さらに、材質が極小となる幅を検知する幅検知手段13の動作を図4を用いて説明する。図4は硬貨通過時の材質センサ8の出力波形50,60を示す。図3と同様、縦軸が発振レベルの変化量で、横軸が時刻である。図4中の実線波形は日本の五百円硬貨の波形50である。それに対して、破線波形は厚み、外径及び最大と最小の材質が五百円硬貨とほぼ等しく、材質が極小となる幅に差がある第2の偽貨の波形60である。これらの波形50,60の違いは次の理由による。五百円硬貨は表面の凹凸度合いが比較的小さい、すなわち材質として検知する硬貨の電磁気的特性の均一さの度合いが高いのに対し、第2の偽貨は表面にくぼみがあるため凹凸度合いが比較的大きい、すなわち材質の均一さが低いからである。本発明はこの違いを、幅検知手段13により、材質が極小となる幅の差として検知しようとするものである。
【0019】
本実施の形態では材質センサ8の出力の極小値51に一定値53を加えた値をしきい値52とし、材質センサ8の出力がしきい値52を下回る時刻54,64と上回る時刻55,65との時刻差56,66により、材質が極小となる幅を検知している。このようにして求めた時刻差56,66は明らかに硬貨の通過速度の影響を受けるため、通過速度の補正を行う必要がある。本実施の形態では硬貨の通過速度に比例していると考えられる、材質センサ8の出力が極大となる2つの時刻74,75の時刻差76を利用している。幅検知手段13は、材質がしきい値以下である時間幅56,66を2つの極大の時刻差76で割った値を示す信号を比較回路19に出力する。
【0020】
記憶回路21には、正貨の種類毎に基準となる値が記憶されている。比較回路15〜20では各検知手段9〜14からの出力を記憶回路21の基準と比較し、許容範囲内で一致していればその正貨の種類を示す信号を出力し、どの種類の基準値とも一致しない場合には偽貨であることを示す信号を出力する。判定回路22では、比較回路15〜20からの信号が全て同じ正貨の種類を示す場合に限りその正貨の種類を示す信号を出力し、それ以外の場合には偽貨を示す信号を判定信号23として出力する。
【0021】
以上のように、本実施の形態によれば、位置、幅、回数検知手段により、硬貨特性が極大或いは極小となる位置、幅、回数をそれぞれ検知することができるので、硬貨特性が極大或いは極小となる位置、幅、回数のいずれかに正貨と差がある偽貨の不正使用を防止することが可能になる。
【0022】
なお、しきい値32,52を固定にすると温度や電源電圧の変動などの影響を受けやすいため、本実施の形態では極大値31から一定値33を減じた値や、極小値51に一定値53を加えた値としているが、極大値31や極小値51と一定値(例えば0.9や1.1)の積などとすることもできる。
【0023】
また、硬貨通過速度の補正に、材質センサ8の出力が極大となる2つの時刻74,75の時刻差76を利用しているが、硬貨の通過速度を示すものであればこれに限らず補正が可能である。
【0024】
そして、厚みセンサ7と材質センサ8でコアを兼用しているのは、硬貨中央の通過時刻を正確に検知するためである。同時に小型化やコストダウンも可能であるが、それぞれ別のセンサであっても構わない。
【0025】
さらに、本実施の形態では、硬貨通過時の発振レベル変化を識別に用いた例を示したが、硬貨によるコイルのインピーダンス変化を利用したものであれば、インダクタンス、周波数、位相等の変化を用いることもできる。
【0026】
【発明の効果】
以上のように本発明の硬貨識別装置における位置検出手段は、前記センサの出力波形から、前記硬貨の中央が前記センサを通過する第1の時刻と、前記センサの出力波形が極大となった第2の時刻とを検出し、前記第1の時刻と前記第2の時刻との差によって硬貨の厚みが極大となる位置を中央からの離れ度合いとして求める構成としたものである。これにより硬貨の厚みが極大となる位置を検出することができるので、たとえ硬貨の最大厚みが正貨とほぼ等しくとも、硬貨の厚みが極大となる位置によって偽貨を判定できる。従って、硬貨の厚みが極大となる位置に差がある偽貨の不正使用を防止することが可能になる。
【図面の簡単な説明】
【図1】 本発明の一実施の形態における硬貨識別装置の制御回路の構成を示すブロック図
【図2】 同、硬貨識別装置の概要を示す構成図
【図3】 同、硬貨識別装置の厚みセンサの出力波形図
【図4】 同、硬貨識別装置の材質センサの出力波形図
【符号の説明】
1 硬貨識別装置
2 投入口
3 硬貨通路
7 厚みセンサ
8 材質センサ
10 回数検知手段
11 位置検知手段
13 幅検知手段
15 比較回路
16 比較回路
17 比較回路
18 比較回路
19 比較回路
20 比較回路
21 記憶回路
22 判定回路
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a coin discriminating apparatus that electrically identifies the authenticity and type of a coin.
[0002]
[Prior art]
In recent years, vending machines have become widespread, and coin recognition devices used for them are required to have high identification performance.
[0003]
Conventionally, this type of coin identification device is characterized by a coin inlet, a coin passage connected to the insertion slot, a sensor disposed on the side wall of the coin passage, and the characteristics of the coin inserted from the output of the sensor. Detection means for detecting, a storage circuit in which data serving as a reference for coin authenticity and coin type is stored in advance, a comparison circuit for comparing the output of the detection means and data in the storage circuit, and this comparison circuit And a determination circuit for determining the true / false and type of coins based on the comparison result. The sensor includes a material, thickness, and outer diameter sensor, and the detection means includes means for detecting the maximum value and the minimum value of the output of each sensor. And the material, thickness, and outer diameter of the coin were detected and identified by the maximum value and the minimum value of the output of each sensor during the coin passage.
[0004]
[Problems to be solved by the invention]
However, in such a conventional configuration, only the maximum value and the minimum value of the coin characteristic were detected as the characteristics of the coin. In other words, in the case of a thickness sensor, only the maximum thickness and the minimum thickness were used.
[0005]
For this reason, although the position where the coin characteristic becomes the maximum or the minimum, there is a difference from the true coin, but there is a case where a fake coin having the same maximum value of the coin characteristic is illegally used. For example, the position of the thickest part is different from the true coin, but similar foreign coins with the same thickness of the part could not be excluded.
[0006]
An object of this invention is to provide the coin identification device which can prevent the unauthorized use of such a false coin.
[0007]
[Means for Solving the Problems]
In order to solve this problem, in the coin identification device according to the present invention, the position detection means is configured such that, from the output waveform of the sensor, the first time when the center of the coin passes the sensor and the output waveform of the sensor are maximum. The second time is detected, and the position where the thickness of the coin is maximized by the difference between the first time and the second time is obtained as the degree of separation from the center . Therefore, although the maximum thickness of the coin is almost equal to that of the true coin , it is possible to prevent the illegal use of the fake coins having different positions where the thickness of the coin is maximized .
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to FIGS.
[0009]
FIG. 2 is a block diagram showing an outline of the coin identifying device in one embodiment of the present invention. In FIG. 2, a coin slot 2 is provided at the upper part of the coin discriminating apparatus body 1, and a coin passage 3 is connected downward from the slot 2. A thickness / material combination sensor 4 and an outer diameter sensor 5 are arranged on the side wall of the passage 3. The passage 3 is connected to a coin outlet 6 located at the lower portion of the coin discriminating apparatus main body 1.
[0010]
FIG. 1 is a block diagram showing a configuration of a control circuit of the coin identifying device according to the present embodiment. In FIG. 1, a thickness sensor 7 includes two cores arranged to face the side walls of the passage 3, coils wound inside these cores, an oscillation circuit formed by these coils, and an oscillation waveform. Is converted from a sine wave to a signal indicating the oscillation level. In the thickness sensor 7, the coils wound around the opposing cores are connected in series in reverse phase so that the mutual inductance becomes negative, and the output is a first maximum value detecting means 9 for detecting the maximum value of the thickness. The frequency detection means 10 for detecting the maximum number of times and the position detection means 11 for detecting the position where the thickness becomes maximum are entered.
[0011]
The material sensor 8 has the same configuration as the thickness sensor 7, but the coils wound around the opposing cores are connected in series and in phase so that the mutual inductance becomes positive, and the output detects the position where the thickness is maximized. The position detection means 11, the second maximum value detection means 12 for detecting the maximum value of the material, and the width detection means 13 for detecting the width at which the material becomes minimum are entered. In this embodiment, the thickness sensor 7 and the material sensor 8 also serve as a core, and are shown as the thickness / material combined sensor 4 in FIG.
[0012]
The outer diameter sensor 5 has the same configuration as the material sensor 8, the coils are connected in series and in phase, and the output enters the third maximum value detecting means 14 for detecting the maximum value of the outer diameter. Outputs of the detection means 9 to 14 enter comparison circuits 15 to 20, respectively. The comparison circuits 15 to 20 are also connected to the storage circuit 21. Each output of the comparison circuits 15 to 20 enters the determination circuit 22, and the determination circuit 22 outputs a determination signal 23.
[0013]
The operation | movement is demonstrated below about the coin identification device comprised as mentioned above. When a coin inserted from the insertion slot 2 approaches the sensors 4 and 5, the impedance of the coil changes, and the oscillation level of the oscillation circuit changes accordingly. The amount of change is different depending on the thickness of the coin in the thickness sensor 7, mainly in the material of the coin in the material sensor 8, and different mainly in the outer diameter of the coin in the outer diameter sensor 5. Each of the rectifier circuits provided in these sensors converts the oscillation waveform of the oscillation circuit from a sine wave to a signal indicating the oscillation level. Each maximum value detecting means 9, 12, 14 detects the first maximum value of the change amount of the oscillation level at the time of passing the coin and outputs it to the corresponding comparison circuits 15, 18, 20 respectively.
[0014]
Next, operations of the number detection means 10 and the position detection means 11 will be described with reference to FIG. FIG. 3 shows output waveforms 30 and 40 of the thickness sensor 7 when coins pass. The vertical axis is the amount of change in oscillation level, and the horizontal axis is time. The solid line waveform in FIG. 3 is the waveform 30 of a Japanese 500 yen coin. On the other hand, the broken line waveform is a waveform 40 of a first pseudo coin having a difference in the number of times and the position where the material, the outer diameter and the maximum thickness are almost equal to a 500-yen coin and the thickness is maximized. The difference between the waveforms 30 and 40 is as follows. This is because the 500-yen coin has the thickest outer peripheral part and the unevenness of the central part is relatively small and the thickness is almost uniform, whereas the first fake coin has the thickest central part and is thicker than the outer peripheral part. The present invention intends to detect these differences as the difference in the number of times and the position where the thickness is maximized by the number-of-times detecting means 10 and the position detecting means 11.
[0015]
In the present embodiment, the value obtained by subtracting the constant value 33 from the maximum value 31 of the output of the thickness sensor 7 is set as the threshold value 32, and the number of times and the position where the output of the thickness sensor 7 is equal to or greater than the threshold value 32 are detected. ing. In the case of FIG. 3, the number of times that the thickness detected in this way is maximized is one in the first false coin waveform 40 as opposed to two in the hundred yen waveform 30. The number detection means 10 outputs a signal indicating this number to the comparison circuit 16.
[0016]
Moreover, in the position detection means 11 of this Embodiment, the position where thickness becomes maximum is calculated | required as a separation degree from the center of a coin. First, the first times 34 and 44 and the last times 35 and 45 at which the output of the thickness sensor 7 matches the threshold value 32 are detected. In parallel, a time 77 at which the center of the coin passes through the thickness / material combination sensor 4 is detected by a method described later. Then, a time difference 36, 46 between the central time 77 and the first time 34, 44 and a time difference 37, 47 between the central time 77 and the last time 35, 45 are obtained, and the larger time difference 36, 47 is selected. The reason for such a detection method is to recognize the difference that 500 yen is the thickest at the outer periphery while the first fake coin is the thickest at the center. Note that the output waveform 50 of the material sensor 8 is approximately the same as shown in FIG. 4 for 500 yen and the first false coin.
[0017]
Since the time differences 36 and 47 thus obtained are obviously affected by the passing speed of coins, it is necessary to correct the passing speed. In this embodiment, as shown in FIG. 4, a time difference 76 between two times 74 and 75 at which the output of the material sensor 8 is considered to be proportional to the passing speed of the coin is used. The position detection means 11 outputs a signal indicating a value obtained by dividing the time difference 36, 47 between the maximum thickness and the center by the time difference 76 between the two maximum values of the material to the comparison circuit 17.
[0018]
Further, the operation of the width detecting means 13 for detecting the width at which the material is minimized will be described with reference to FIG. FIG. 4 shows output waveforms 50 and 60 of the material sensor 8 when coins pass. Similar to FIG. 3, the vertical axis represents the amount of change in oscillation level, and the horizontal axis represents time. The solid line waveform in FIG. 4 is the waveform 50 of a Japanese 500 yen coin. On the other hand, the broken line waveform is a waveform 60 of a second pseudo coin having a thickness, an outer diameter, and a maximum and minimum material that are substantially equal to a 500-yen coin and a difference in width at which the material is minimized. The difference between the waveforms 50 and 60 is as follows. The 500-yen coin has a relatively small degree of unevenness on the surface, that is, the degree of uniformity of the electromagnetic characteristics of the coin detected as a material is high, whereas the second false coin has a depression on the surface, so the degree of unevenness is high. This is because it is relatively large, that is, the material uniformity is low. In the present invention, this difference is detected by the width detecting means 13 as a difference in width at which the material is minimized.
[0019]
In the present embodiment, a value obtained by adding a constant value 53 to the minimum value 51 of the output of the material sensor 8 is set as the threshold value 52, and the times 55 and 64 when the output of the material sensor 8 falls below the threshold value 52. Based on the time differences 56 and 66 from 65, the width at which the material is minimized is detected. Since the time differences 56 and 66 thus obtained are obviously affected by the passing speed of coins, it is necessary to correct the passing speed. In the present embodiment, a time difference 76 between two times 74 and 75 at which the output of the material sensor 8 is considered to be proportional to the passing speed of the coin is used. The width detection unit 13 outputs a signal indicating a value obtained by dividing the time widths 56 and 66 whose material is equal to or less than the threshold value by the time difference 76 between the two maximums to the comparison circuit 19.
[0020]
The storage circuit 21 stores a reference value for each type of true coin. The comparison circuits 15 to 20 compare the outputs from the detection means 9 to 14 with the reference of the storage circuit 21, and output a signal indicating the type of the genuine coin if they match within the allowable range. If the value does not match, a signal indicating that it is a fake coin is output. The determination circuit 22 outputs a signal indicating the type of the true coin only when the signals from the comparison circuits 15 to 20 all indicate the same type of the correct coin, and determines a signal indicating the false coin in other cases. Output as signal 23.
[0021]
As described above, according to the present embodiment, the position, width, and number of times detection unit can detect the position, width, and number of times at which the coin characteristic is maximized or minimized, so that the coin characteristic is maximized or minimized. It is possible to prevent illegal use of fake coins that differ from the true coins in any of the position, width, and number of times.
[0022]
Note that if the threshold values 32 and 52 are fixed, they are easily affected by fluctuations in temperature and power supply voltage. Therefore, in the present embodiment, a value obtained by subtracting the constant value 33 from the maximum value 31 or a constant value to the minimum value 51. 53 is added, but it may be a product of a maximum value 31 or a minimum value 51 and a constant value (for example, 0.9 or 1.1).
[0023]
In addition, the time difference 76 between the two times 74 and 75 at which the output of the material sensor 8 is maximized is used to correct the coin passing speed. However, the correction is not limited to this as long as it indicates the passing speed of the coin. Is possible.
[0024]
The reason why the thickness sensor 7 and the material sensor 8 serve as a core is to accurately detect the passage time of the center of the coin. At the same time, downsizing and cost reduction are possible, but different sensors may be used.
[0025]
Furthermore, in this embodiment, an example in which the oscillation level change at the time of coin passage is used for identification is shown. However, if the change in the impedance of the coil by the coin is used, changes in inductance, frequency, phase, etc. are used. You can also.
[0026]
【The invention's effect】
As described above, the position detecting means in the coin discriminating apparatus of the present invention is based on the output waveform of the sensor, the first time when the center of the coin passes through the sensor, and the output waveform of the sensor is maximized. 2 is detected, and the position where the thickness of the coin is maximized by the difference between the first time and the second time is obtained as the degree of separation from the center . Since this makes it possible to detect the position where the thickness of the coin is maximized, can determine false coin if equal approximately the maximum thickness of the coin is the genuine Shikutomo, depending on the position where the thickness becomes maximum coins. Therefore, it becomes possible to prevent the illegal use of the fake coins having a difference in the position where the thickness of the coin is maximized.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of a control circuit of a coin discriminating apparatus according to an embodiment of the present invention. FIG. 2 is a block diagram showing an outline of the coin discriminating apparatus. FIG. Output waveform diagram of sensor [Fig. 4] Same as above, Output waveform diagram of material sensor of coin identification device [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Coin identification apparatus 2 Slot 3 Coin passage 7 Thickness sensor 8 Material sensor 10 Count detection means 11 Position detection means 13 Width detection means 15 Comparison circuit 16 Comparison circuit 17 Comparison circuit 18 Comparison circuit 19 Comparison circuit 20 Comparison circuit 21 Storage circuit 22 Judgment circuit

Claims (6)

硬貨の投入口と、この投入口に連結された硬貨通路と、この硬貨通路の側壁に配置されたセンサと、このセンサの出力が供給された位置検知手段と、前記硬貨の正偽及び種類の基準となるデータがあらかじめ記憶された記憶回路と、この記憶回路のデータと、前記位置検知手段の出力とを比較する比較回路と、この比較回路の比較結果により硬貨の正偽及び種類を判定する判定回路とを備え、前記位置検出手段は、前記センサの出力波形から、前記硬貨の中央が前記センサを通過する第1の時刻と、前記センサの出力波形が極大となった第2の時刻とを検出し、前記第1の時刻と前記第2の時刻との差によって硬貨の厚みが極大となる位置を中央からの離れ度合いとして求める硬貨識別装置。And coin input port, a coin passage which is connected to the inlet, a sensor disposed on a side wall of the coin passage, a position detecting unit whose output is supplied from the sensor, the genuineness and kind of the coin A storage circuit in which reference data is stored in advance, a comparison circuit that compares the data of the storage circuit with the output of the position detection means, and whether the coin is true or false is determined based on the comparison result of the comparison circuit. A determination circuit , wherein the position detection means, from the output waveform of the sensor, a first time when the center of the coin passes the sensor, and a second time when the output waveform of the sensor becomes a maximum. And a position where the thickness of the coin is maximized due to the difference between the first time and the second time as a degree of separation from the center . センサは第1のセンサと、この第1のセンサとは異なる硬貨特性を検知する第2のセンサとを有し、前記第1のセンサの出力波形から第1の時刻を検出するとともに、前記第2のセンサの出力波形から第2の時刻を検出する請求項1に記載の硬貨識別装置。The sensor has a first sensor and a second sensor for detecting a coin characteristic different from the first sensor, detects a first time from an output waveform of the first sensor, and The coin identifying device according to claim 1, wherein the second time is detected from an output waveform of the two sensors. 第1のセンサは、材質センサとするとともに、第2のセンサは、厚みセンサとした請求項2に記載の硬貨識別装置。The coin identifying apparatus according to claim 2, wherein the first sensor is a material sensor, and the second sensor is a thickness sensor. 厚みセンサは、コイルを巻いたコアを2つ硬貨通路に対向して配置し、これらのコイルを相互インダクタンスが負になるように直列逆相接続した請求項3に記載の硬貨識別装置。The coin sensor according to claim 3, wherein the thickness sensor has two cores each wound with a coil arranged opposite to the coin passage, and these coils are connected in series in reverse phase so that mutual inductance becomes negative. 材質センサは、コイルを巻いたコアを2つ硬貨通路に対向して配置し、これらのコイルを相互インダクタンスが正になるように直列同相接続した請求項3に記載の硬貨識別装置。4. The coin identification device according to claim 3, wherein the material sensor is arranged such that two cores each having a coil wound are arranged opposite to the coin passage, and these coils are connected in series and in phase so that mutual inductance becomes positive. 第1の時刻と第2の時刻との差を、硬貨の通過速度で補正する請求項1に記載の硬貨識別装置。The coin identifying device according to claim 1, wherein the difference between the first time and the second time is corrected by a coin passing speed.
JP27494198A 1998-09-29 1998-09-29 Coin identification device Expired - Lifetime JP3713979B2 (en)

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