JPH0452518B2 - - Google Patents
Info
- Publication number
- JPH0452518B2 JPH0452518B2 JP57234687A JP23468782A JPH0452518B2 JP H0452518 B2 JPH0452518 B2 JP H0452518B2 JP 57234687 A JP57234687 A JP 57234687A JP 23468782 A JP23468782 A JP 23468782A JP H0452518 B2 JPH0452518 B2 JP H0452518B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- magnetic head
- flux density
- magnetic flux
- residual
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 230000004907 flux Effects 0.000 claims description 40
- 238000001514 detection method Methods 0.000 claims description 33
- 230000005389 magnetism Effects 0.000 claims description 17
- 239000000696 magnetic material Substances 0.000 claims description 9
- 238000011144 upstream manufacturing Methods 0.000 claims 1
- 239000000126 substance Substances 0.000 description 11
- 239000013256 coordination polymer Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000007493 shaping process Methods 0.000 description 6
- 239000008186 active pharmaceutical agent Substances 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 230000005415 magnetization Effects 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Inspection Of Paper Currency And Valuable Securities (AREA)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Description
【発明の詳細な説明】
発明の技術分野：
本発明は、小切手、紙幣等の紙葉類に印刷され
た印刷インクに含まれる磁性物質の種類を識別す
る磁性物質識別装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention: The present invention relates to a magnetic material identification device for identifying the type of magnetic material contained in printing ink printed on paper sheets such as checks and banknotes.
発明の技術的背景：
小切手、紙蔽等の紙葉類の印刷インクの一部に
磁性物質が含まれることは周知であり（このよう
な印刷インクを磁気インクと称する）、従来紙葉
類上の磁性物質の有無、量、パターン等を検出す
ることにより、紙葉類の真偽や種類を識別するよ
うにしている。しかし、複写機の中にもトナーの
磁性物質を含むものがあり、この種複写機でトナ
ー濃度を調整して複写すると、磁性物質の識別か
らは本物と誤織別する程度のものも作成できるよ
うになつている。また、磁性物質を含まない複写
物に、磁性鉛筆で薄く上塗りしても同様に誤識別
するようなものが作成できる。Technical background of the invention: It is well known that a part of printing ink for paper sheets such as checks and paper sheets contains a magnetic substance (such printing ink is called magnetic ink). By detecting the presence, amount, pattern, etc. of magnetic substances, the authenticity and type of paper sheets can be identified. However, some copying machines contain toner that contains magnetic substances, and when the toner concentration is adjusted and copies are made using this type of copying machine, it is possible to make copies that can be mistakenly distinguished from the real thing based on the identification of the magnetic substance. It's becoming like that. Furthermore, even if a copy that does not contain magnetic material is overcoated with a thin layer of magnetic pencil, it is possible to create a copy that is similarly erroneously identified.
発明が解決しようとする課題：
紙葉類を複写機で複写したり、磁気鉛筆で上塗
りした場合に、単に磁性物質の有無、量、パター
ン等で識別することは、個別の磁化特性値や磁気
パターンの一致で検出することになり、真偽等の
識別には不十分である。確実に識別するために
は、磁性物質の種類を識別することが有効であ
る。磁性物質の種類を識別するには磁化特性のヒ
ステリシスループの形状を比較すれば良いが、ヒ
ステリシスループを求めるには一般的に手順や装
置が複雑である。また、従来のヒステリシスルー
プの測定は、被測定物を静止させ、指定箇所のポ
イント測定になるといつた問題があり、紙葉類の
識別には直ちに応用することができなかつた。Problem to be solved by the invention: When paper sheets are copied using a copying machine or overcoated with a magnetic pencil, it is difficult to identify them simply by the presence, amount, pattern, etc. of magnetic substances. Detection is based on pattern matching, which is insufficient for distinguishing between authenticity and falsehood. For reliable identification, it is effective to identify the type of magnetic substance. The type of magnetic material can be identified by comparing the shapes of the hysteresis loops of the magnetization characteristics, but determining the hysteresis loops generally requires complicated procedures and equipment. In addition, conventional hysteresis loop measurement has the problem of requiring the object to be measured to be stationary and measuring points at designated locations, and cannot be immediately applied to the identification of paper sheets.
発明の目的：
本出願人は、紙葉類の磁性物質が磁気複写物と
磁気鉛筆では異なること、また、例えば本物の紙
幣では金種等によつて含有磁性物質の種類が異な
ることを見い出し、この事実に基づき磁性物質の
種類を、紙葉類の搬送中において確実にかつ、容
易に識別するための装置を提供することを目的と
しており、これにより紙葉類の確実な識別に役だ
たせようとすることにある。Purpose of the invention: The applicant has discovered that the magnetic substances in paper sheets are different between magnetic copies and magnetic pencils, and that, for example, in genuine banknotes, the type of magnetic substance contained differs depending on the denomination, etc. Based on this fact, our aim is to provide a device that can reliably and easily identify the type of magnetic material while paper sheets are being transported. It's about trying.
課題を解決するための手段：
本発明は紙葉類の磁性物質識別装置に関するも
ので、本発明の上記目的は、紙葉類の搬送路の上
流及び下流に配設された差動型磁気ヘツド及び残
留磁気検出型磁気ヘツドと、前記差動型磁気ヘツ
ド及び残留磁気検出型磁気ヘツドの間の前記搬送
路に設けられた磁石と、前記差動型磁気ヘツドか
ら出力される最大磁束密度及び前記残留磁気検出
型磁気ヘツドから出力される残留磁束密度を入力
してその比を求める割算手段と、前記割算手段で
求められた比を入力して設定値を比較することに
よつて、前記紙葉類の磁性物質の種類を識別する
比較判別手段とを設けることによつて達成され
る。Means for Solving the Problems: The present invention relates to a magnetic substance identification device for paper sheets. and a residual magnetism detection type magnetic head, a magnet provided in the conveying path between the differential type magnetic head and the residual magnetism detection type magnetic head, the maximum magnetic flux density output from the differential type magnetic head, and the a dividing means for inputting the residual magnetic flux density outputted from the residual magnetism detection type magnetic head and calculating the ratio thereof; and inputting the ratio determined by the dividing means and comparing the set values. This is achieved by providing a comparison and discrimination means for identifying the type of magnetic material in the paper sheet.
作 用：
紙葉類を識別用のヘツド部を通過させることに
より、ヘツド部から検出した紙葉類の最大磁束密
度と残留磁束密度との比を求め、この比の値を設
定値と比較し、紙葉類に印刷された磁気インクの
磁性物質の種類を判別する。最大磁束密度と残留
磁束密度は容易に測定することができ、最大磁束
密度と残留磁束密度の比は磁化特性のヒステリシ
スループの形状と密接な関係があり、結果的にヒ
ステリシスループの形状を比較することになつて
いる。これにより、紙葉類の磁性物質を、紙葉類
を搬送しながら確実にかつ簡易に識別することが
できる。Function: By passing paper sheets through the identification head section, the ratio between the maximum magnetic flux density of the paper sheets detected from the head section and the residual magnetic flux density is determined, and the value of this ratio is compared with the set value. , determine the type of magnetic substance in magnetic ink printed on paper sheets. The maximum magnetic flux density and the residual magnetic flux density can be easily measured, and the ratio of the maximum magnetic flux density and the residual magnetic flux density is closely related to the shape of the hysteresis loop of the magnetization characteristics, and as a result, the shape of the hysteresis loop can be compared. It has become commonplace. Thereby, the magnetic substance of the paper sheet can be reliably and easily identified while the paper sheet is being conveyed.
発明の実施例：
磁気インクは、その種類によりヒステリシスル
ープで表わすと、第１図Ａ〜Ｃに示すような３つ
のタイプに分類されることが実験の結果、判明し
た。すなわち、第１図Ａのタイプは、磁界の強さ
Ｈを最大Hmにしたときの最大磁束密度Bmと、
磁界Ｈを取り去つたときの残留磁束密度Brとに
差が程んど出ないものであり、同図Ｂのタイプは
最大磁束密度Bmと残留磁束密度Brとによる程度
差が生じ、残留磁束密度Brもある程度有するも
のである。また、第１図Ｃのタイプは最大磁束密
度Bmと残留磁束密度Brとに大きな差があり、残
留磁束密度Br自体が非常に小さいものである。
これら特性図から明らかなように、磁気インクが
上記３特性のどのタイプに属するかを検出するに
は、最大磁束密度Bmと残留磁束密度Brとを測定
して両者の比を求めれば良い。本例では３つの特
性のタイプを示しているが、更に多くのタイプに
ついても適用できる。そして、両磁束密度の測定
には、２つの異なる磁気ヘツドを使用する。すな
わち、最大磁束密度Bmの検出には差動型磁気ヘ
ツド又はバイアス磁界型磁気ヘツドを用いれば良
く、差動型磁気ヘツドは第２図に示すように、コ
ア１の中央部に巻回された１次巻線２に正弦波３
を印加して交流変調磁界を形成し、コア１の両腕
部に差動的に巻回された２次巻線４で、搬送され
る紙葉類５の面に対向するヘツド部との出力の差
を取出すようにしたものであり、第３図Ａに示す
ように変調正弦波３のピーク時に最大磁束密度
Bmが検出される。また、バイアス磁界型磁気ヘ
ツドはバイアス電流により直流磁界を形成し、紙
葉類からの出力を取出すものであり、第３図Ｂに
示すようにバイアス電流による直流磁界H1を印
加した時の磁束Bmを検出するようになつてい
る。このようにして磁化された紙葉類の残留磁束
密度Brの検出には、残留磁気検出型の磁気ヘツ
ドを用いれば良く、たとえば第３図Ｃに示すよう
に当該磁気ヘツドの直前に磁石を配設して紙葉類
を一旦磁化（H2）させ、その後に紙葉類をヘツ
ド位置まで移動させて残留磁束密度Brを検出す
る。なお、差動型磁気ヘツドの場合、変調正弦波
３のゼロクロスにおける残留磁束を検出するよう
にしても良く、この場合には紙葉類を移動させな
くても検出することができる。Embodiments of the Invention: As a result of experiments, it has been found that magnetic ink can be classified into three types as shown in FIGS. 1A to 1C when represented by hysteresis loops according to their types. In other words, the type shown in Figure 1A has the maximum magnetic flux density Bm when the magnetic field strength H is the maximum Hm,
There is little difference in the residual magnetic flux density Br when the magnetic field H is removed, and in the type B in the same figure, there is a difference in degree depending on the maximum magnetic flux density Bm and the residual magnetic flux density Br, and the residual magnetic flux density It also has a certain amount of Br. Further, in the type shown in FIG. 1C, there is a large difference between the maximum magnetic flux density Bm and the residual magnetic flux density Br, and the residual magnetic flux density Br itself is very small.
As is clear from these characteristic diagrams, in order to detect which type of the above three characteristics the magnetic ink belongs to, it is sufficient to measure the maximum magnetic flux density Bm and the residual magnetic flux density Br and find the ratio between them. Although three types of characteristics are shown in this example, it can also be applied to more types. Two different magnetic heads are used to measure both magnetic flux densities. That is, to detect the maximum magnetic flux density Bm, it is sufficient to use a differential magnetic head or a bias magnetic field type magnetic head, and the differential magnetic head has a magnetic head wound around the center of the core 1, as shown in Fig. 2. Sine wave 3 in primary winding 2
is applied to form an alternating current modulated magnetic field, and the secondary winding 4 differentially wound around both arms of the core 1 outputs an output to the head section facing the surface of the paper sheet 5 to be conveyed. As shown in Figure 3A, the maximum magnetic flux density is at the peak of the modulated sine wave 3.
Bm is detected. In addition, the bias magnetic field type magnetic head forms a DC magnetic field using a bias current and extracts the output from the paper sheet, and as shown in Figure 3B, the magnetic flux Bm when a DC magnetic field H1 due to the bias current is applied. is now being detected. To detect the residual magnetic flux density Br of paper sheets magnetized in this way, a residual magnetism detection type magnetic head may be used. For example, as shown in Fig. 3C, a magnet is placed just in front of the magnetic head. The paper sheet is once magnetized (H2), and then the paper sheet is moved to the head position and the residual magnetic flux density Br is detected. In the case of a differential magnetic head, the residual magnetic flux at the zero cross of the modulated sine wave 3 may be detected, and in this case, the detection can be performed without moving the paper sheet.
以上のようにして求められる差動型磁気ヘツド
からの検出信号Bm及び残留磁気検出型磁気ヘツ
ドからの検出信号Br、あるいはバイアス磁界型
磁気ヘツドからの検出信号Bm及び残留磁気検出
型磁気ヘツドからの検出信号Brを、それぞれ割
算器に入力すればその比Bm／Brを求めることが
でき、この比の値が予め定められたどの範囲に属
するかを比較判別し、磁性物質の特性、つまり磁
気インクの種類を決定することができる。 The detection signal Bm from the differential magnetic head and the detection signal Br from the residual magnetism detection type magnetic head obtained as described above, or the detection signal Bm from the bias magnetic field type magnetic head and the detection signal Br from the residual magnetism detection type magnetic head. By inputting each of the detection signals Br to a divider, the ratio Bm/Br can be obtained.The value of this ratio is compared to determine which predetermined range it belongs to, and the characteristics of the magnetic material, that is, the magnetic The type of ink can be determined.
第４図はこの例を示す装置例であり、差動型磁
気ヘツド５１及び残留磁気検出型磁気ヘツド５２
はそれぞれ搬送される紙葉類５３に近接して配設
され、紙葉類５３に付せられた磁気インクの磁気
特性を検出するようになつている。そして、差動
型磁気ヘツド５１からの最大磁束密度Bm及び残
留磁気検出型磁気ヘツド５２からの残留磁束密度
Brはそれぞれ割算手段としての割算器５４に入
力され、この割算器５４で最大磁束密度Bmと残
留磁束密度Brとの比Bm／Brを求め、この比
Bm／Brを比較判別手段としての比較判別回路５
５に入力する。この場合、紙葉類５３の同一箇所
を同時に検出することは磁気ヘツドの取付スペー
スの関係でできないので、磁気ヘツド５１及び５
２を図示のようにずらして設け、磁気ヘツド５１
の検出出力を割算器５４で一時記憶しておき、移
動された紙葉類５３の磁気ヘツド５２からの検出
出力Brが入力された時に、その比Bm／Brを求
めるようにする。こうして、比較判別回路５５に
比Bm／Brが入力されると、比較判別回路５５は
第１図ＡとＢの特性を区別するために入力されて
いる設定値SL1と、同図ＢとＣの特性を区別する
ために入力されている設定値SL2との比較を行な
い、識別信号S1〜S3を出力する。すなわち、
１） Bm／Br＜SL1のとし信号S1を出力
２） SL1≦Bm／Br＜SL2のとき信号S2を出力
３） SL2≦Bm／Brのとき信号S3を出力
するようにする。このような比較判別を行なうこ
とにより、比Bm／Brの大きさから上述した３つ
の特性（第１図Ａ〜Ｃ）を識別することができ
る。 FIG. 4 shows an example of a device showing this example, which includes a differential magnetic head 51 and a residual magnetism detection type magnetic head 52.
are arranged close to the paper sheets 53 being conveyed, respectively, and are designed to detect the magnetic characteristics of the magnetic ink applied to the paper sheets 53. The maximum magnetic flux density Bm from the differential type magnetic head 51 and the residual magnetic flux density from the residual magnetism detection type magnetic head 52
Each Br is input to a divider 54 as a dividing means, and this divider 54 calculates the ratio Bm/Br between the maximum magnetic flux density Bm and the residual magnetic flux density Br, and this ratio
Comparison/discrimination circuit 5 as means for comparing and discriminating Bm/Br
Enter 5. In this case, it is not possible to detect the same location on the paper sheet 53 at the same time due to the installation space of the magnetic heads.
2 are shifted as shown in the figure, and the magnetic head 51
The detection output Br from the magnetic head 52 of the moved paper sheet 53 is temporarily stored in a divider 54, and the ratio Bm/Br is calculated when the detection output Br from the magnetic head 52 of the moved paper sheet 53 is input. In this way, when the ratio Bm/Br is input to the comparison/discrimination circuit 55, the comparison/discrimination circuit 55 uses the set value SL1 input for distinguishing the characteristics of FIG. 1A and B, and the set value SL1 of FIG. A comparison is made with a set value SL2 input to distinguish the characteristics, and identification signals S1 to S3 are output. That is, 1) When Bm/Br<SL1, the signal S1 is output.2) When SL1≦Bm/Br<SL2, the signal S2 is output.3) When SL2≦Bm/Br, the signal S3 is output. By performing such comparison and discrimination, the above-mentioned three characteristics (FIG. 1A to C) can be identified from the magnitude of the ratio Bm/Br.
次に、本発明を紙幣の識別に適用した例を第５
図Ａ，Ｂ及び第６図に示して説明する。第５図
Ａ，Ｂは紙幣１０を搬送・識別する機構を示すも
のであり、紙幣１０の挿入口には紙幣挿入を検知
するためのフオトセンサ１１が設けられており、
このフオトセンサ１１の検知信号によつて上下１
対ずつの搬送ベルト１２Ａ，１２Ｂ及び１３Ａ，
１３Ｂが駆動されるようになつている。搬送ベル
ト１２Ａ，１３Ａはプーリ１４，１５間に巻回さ
れ、搬送ベルト１２Ｂ，１３Ｂはプーリ１６，１
７間に巻回されており、ベルト１２Ａ，１２Ｂと
１３Ａ，１３Ｂとの中間部の紙幣搬送路には蒲鉾
形状の差動型磁気ヘツド２０が配設されると共
に、その下流側にも同様に残留磁気検出型磁気ヘ
ツド２１が配設されている。そして、プーリ１
４，１６の近傍には紙幣１０が搬送機構内に取込
まれたことを検知するためのフオトセンサ２２が
設けられており、磁気ヘツド２０と２１との間に
は紙幣１０に塗付された磁気インクを磁化するた
めの磁石２３が設けられている。なお、磁気ヘツ
ド２０及び２１の上方には、搬送される紙幣１０
を挟持してガイドするためのフリーローラ２４及
び２５が配設されている。また、プーリ１７には
周縁に多数のスリツトを有する回転板等で成るフ
オトインタラプタ２６が取付けられており、後述
するクロツクパルスを生成するようになつてい
る。 Next, a fifth example of applying the present invention to banknote identification will be described.
This will be explained with reference to FIGS. A, B and FIG. 5A and 5B show a mechanism for conveying and identifying banknotes 10, and a photo sensor 11 for detecting banknote insertion is provided in the banknote 10 insertion slot.
Depending on the detection signal of this photo sensor 11,
Pairs of conveyor belts 12A, 12B and 13A,
13B is driven. The conveyor belts 12A, 13A are wound between the pulleys 14, 15, and the conveyor belts 12B, 13B are wound around the pulleys 16, 1.
A semi-cylindrical differential magnetic head 20 is disposed on the banknote conveying path in the middle between the belts 12A, 12B and 13A, 13B, and a differential magnetic head 20 in the shape of a semi-circle is disposed on the downstream side thereof. A residual magnetism detection type magnetic head 21 is provided. And pulley 1
A photo sensor 22 for detecting that the banknote 10 is taken into the conveyance mechanism is provided near the banknotes 4 and 16, and a photo sensor 22 is provided between the magnetic heads 20 and 21 to detect the magnetic field applied to the banknote 10. A magnet 23 is provided for magnetizing the ink. Note that above the magnetic heads 20 and 21, the banknotes 10 being conveyed are
Free rollers 24 and 25 are provided to sandwich and guide the. Further, a photo interrupter 26 is attached to the pulley 17 and is made of a rotary plate or the like having a large number of slits around its periphery, and is adapted to generate a clock pulse to be described later.
一方、紙幣識別の回路系は第６図に示すように
なつており、全体の制御を行なうコンピユータ
（マイクロコンピユータ等；以下、単にCPUとす
る）３０を有し、このCPU３０にはバスライン
３１を介してROM（Read Only Memory）３２
とRAM（Random Access Memory）３３とが
接続されており、CPU３０にはフオトインタラ
プタ２６の出力を波形整形回路３４で波形整形し
たクロツクパルスCPと、フオトセンサ２２の検
出波形を波形整形回路３５で波形整形した紙幣検
知信号NDとが入力される。また、差動型磁気ヘ
ツド２０の検出信号は差動増幅器４０で増幅さ
れ、その増幅信号ASが全波整流の整流器４１及
びバンドパスフイルタ４２を経て信号を包絡線
AFに波形変換され、積分器４３で積分された後
にAD変換器４４でデジタル化される。同様に、
残留磁気検出型磁気ヘツド２１の検出信号も増幅
器４５で増幅され、その増幅信号DSが全波整流
の整流器４６及びローパスフイルタ４７を経て信
号包絡線DFに波形変換され、積分器４８で積分
された後にAD変換器４９でデイジタル化され
る。そして、CPU３０から積分器４３，４８及
びAD変換器４４，１９に対して、動作をタイミ
ング的に制御するためのタイミング信号T1〜T4
が入力されている。 On the other hand, the banknote identification circuit system is as shown in FIG. 6, and includes a computer (such as a microcomputer; hereinafter simply referred to as CPU) 30 that controls the entire system, and this CPU 30 is connected to a bus line 31. via ROM (Read Only Memory) 32
and a RAM (Random Access Memory) 33 are connected to the CPU 30, and the CPU 30 receives a clock pulse CP obtained by shaping the output of the photo interrupter 26 in a waveform shaping circuit 34, and a clock pulse CP obtained by shaping the waveform detected by the photo sensor 22 in a waveform shaping circuit 35. A banknote detection signal ND is input. The detection signal of the differential magnetic head 20 is amplified by a differential amplifier 40, and the amplified signal AS passes through a full-wave rectifier 41 and a bandpass filter 42, and then converts the signal into an envelope.
The waveform is converted into AF, integrated by an integrator 43, and then digitized by an AD converter 44. Similarly,
The detection signal of the residual magnetism detection type magnetic head 21 is also amplified by the amplifier 45, and the amplified signal DS is converted into a signal envelope DF through a full-wave rectifier 46 and a low-pass filter 47, and then integrated by an integrator 48. It is then digitized by an AD converter 49. Timing signals T1 to T4 are sent from the CPU 30 to the integrators 43 and 48 and the AD converters 44 and 19 to control the operation in terms of timing.
is entered.
このような構成において、その動作を第７図
Ａ，Ｂのタイミングチヤートを参照して説明す
る。 In such a configuration, its operation will be explained with reference to timing charts shown in FIGS. 7A and 7B.
紙幣１０が識別装置の所定位置に挿入される
と、フオトセンサ１１がこれを検出することによ
り搬送ベルト１２Ａ，１２Ｂ及び１３Ａ，１３Ｂ
が駆動され、紙幣１０がベルト間に挟まれて移送
される。搬送ベルトを巻回したプーリ１７はフオ
トインタラプタ２６が結合されており、紙幣１０
の搬送に同期したクロツクパルスCPが波形整形
回路３４から出力され、紙幣１０がフオトセンサ
２２に達し、波形整形回路３５から紙幣検知信号
NDが出力された後にこのクロツクパルスCPを
CPU３０で計数する。以後、この計数値に従つ
てCPU３０は読取りのタイミング等種々の識別
動作を制御する。 When the banknote 10 is inserted into a predetermined position of the identification device, the photo sensor 11 detects this and the conveyor belts 12A, 12B and 13A, 13B
is driven, and the banknotes 10 are conveyed while being sandwiched between the belts. A photo interrupter 26 is connected to the pulley 17 around which the conveyor belt is wound, and the banknote 10
A clock pulse CP synchronized with the conveyance of the banknote 10 is output from the waveform shaping circuit 34, the banknote 10 reaches the photo sensor 22, and the banknote detection signal is output from the waveform shaping circuit 35.
This clock pulse CP is output after ND is output.
Count with CPU30. Thereafter, the CPU 30 controls various identification operations such as reading timing according to this count value.
紙幣１０の先端が差動型磁気ヘツド２０に達し
た後、紙幣１０の模様部分が磁気ヘツド２０位置
に達すると（これはクロツクパルスCPの計数値
により判別される）、タイミング信号T1により積
分器４３のリセツトが解除されて積分が開始され
る。差動型磁気ヘツド２０にはえば5KHzの正弦
波が印加されており、磁気インクが全くないとき
でも微小な正弦波の検出出力が得られるような構
造になつており、差動型磁気ヘツド２０の出力は
差動増幅器４０により増幅された後（信号AS）、
整流器４１で全波整流され、バンドパスフイルタ
を介して（信号AFが）積分器４３へ入力される。
ここにおいて、紙幣の移動により得られる各部波
形は例えば第７図Ａのようになる。バンドパスフ
イルタ４２の出力波形AFが紙幣１０の各点にお
ける磁気インクの最大磁束密度Bmを表わし、最
大磁束密度Bmの値が変化するのは磁気インクの
量が紙幣１０の各点で変化しているからである。
そして、紙幣１０の後端が差動型磁気ヘツド２０
を通過しきるとき（紙幣１０の後端がフオトセン
サ２２を通過してからのクロツクパルスCPの計
数値により判別）に、CPU３０からのタイミン
グ信号T2に従つてAD変換器４４で積分器４３の
値AIをデイジタル量に変換し、その値をRAM３
３に記憶する。なお、第７図Ａの時間To（t1〜
t2）は紙幣１０の範囲を示している。 After the leading edge of the banknote 10 reaches the differential magnetic head 20, when the pattern part of the banknote 10 reaches the position of the magnetic head 20 (this is determined by the count value of the clock pulse CP), the integrator 43 is activated by the timing signal T1. The reset is released and integration is started. For example, a 5KHz sine wave is applied to the differential magnetic head 20, and the structure is such that a minute sine wave detection output can be obtained even when there is no magnetic ink. After the output of is amplified by the differential amplifier 40 (signal AS),
A rectifier 41 performs full-wave rectification, and the signal AF is input to an integrator 43 via a bandpass filter.
Here, the waveforms of various parts obtained by the movement of the bill are as shown in FIG. 7A, for example. The output waveform AF of the bandpass filter 42 represents the maximum magnetic flux density Bm of the magnetic ink at each point on the banknote 10, and the value of the maximum magnetic flux density Bm changes because the amount of magnetic ink changes at each point on the banknote 10. Because there is.
The rear end of the banknote 10 is connected to a differential magnetic head 20.
(determined by the counted value of the clock pulse CP after the trailing edge of the banknote 10 passes the photo sensor 22), the AD converter 44 converts the value AI of the integrator 43 in accordance with the timing signal T2 from the CPU 30. Convert it to a digital quantity and store the value in RAM3
Store in 3. Note that the time To(t1~
t2) indicates the range of banknotes 10.
一方、残留磁気検出型磁気ヘツド２１に系統に
ついてもほぼ同様の制御処理がなされ、磁気ヘツ
ド２１の出力は増幅器４５により増幅された後
（信号DS）、整流器４６で全波整流され、ローパ
スフイルタ４７を介して（信号DFが）積分器４
８へ入力される。積分開始の時期は紙幣先端の模
様部分が磁気ヘツド２１位置に達したときであり
（紙幣１０の先端がフオトセンサ２２に達してか
らのクロツクパルスCPの計数値により判別）、
CPU３０からのタイミング信号T3によつて制御
される。なお、この磁気ヘツド２１の直前には紙
幣１０の磁気インクを磁化させるための磁石２３
が設けられており、紙幣１０の移動によつて得ら
れる各波形は例えば第７図Ｂのようになる。ロー
パスフイルタ４７の出力波形DFが紙幣１０の各
点における磁気インクの残留磁束密度Brを表わ
し、この磁速密度Brの値が変化するのも上記磁
速密度Bmの場合と同様に、磁気インクの量が紙
幣１０の各点において変化しているからである。
そして、紙幣１０の後端が磁気ヘツド２１を通過
しきるときに、CPU３０からのタイミング信号
T4に従つてAD変換器４４にて積分器４８の値
DIをデイジタル量に変換し、その値をRAM３３
に記憶する。なお、第７図Ｂの時間To（t1〜t2）
も紙幣１０の範囲を示している。 On the other hand, almost the same control processing is performed on the system of the residual magnetism detection type magnetic head 21, and the output of the magnetic head 21 is amplified by the amplifier 45 (signal DS), then full-wave rectified by the rectifier 46, and passed through the low-pass filter 47. (signal DF) through integrator 4
8. The timing to start the integration is when the patterned portion of the tip of the bill reaches the position of the magnetic head 21 (determined by the count value of the clock pulse CP after the tip of the bill 10 reaches the photo sensor 22).
It is controlled by a timing signal T3 from the CPU 30. Note that a magnet 23 for magnetizing the magnetic ink on the banknote 10 is placed immediately before the magnetic head 21.
are provided, and each waveform obtained by the movement of the banknote 10 is as shown in FIG. 7B, for example. The output waveform DF of the low-pass filter 47 represents the residual magnetic flux density Br of the magnetic ink at each point on the banknote 10, and the value of this magnetic velocity density Br changes as well as the case of the magnetic velocity density Bm described above. This is because the amount changes at each point on the banknote 10.
Then, when the rear end of the banknote 10 has completely passed through the magnetic head 21, a timing signal from the CPU 30 is sent.
The value of the integrator 48 at the AD converter 44 according to T4
Convert DI to digital quantity and store the value in RAM33
to be memorized. In addition, time To (t1 to t2) in Figure 7B
also indicates the range of banknotes 10.
その後、CPU３０はRAM３３に記憶された２
つの積分値AI、DIを読出し割算の演算を行なう
ことによりAI／DI、つまりBm／Brの値を求め、
この値を一旦RAM３３に記憶する。そして、
CPU３０はこの値とROM３２に予め記憶されて
いる設定値とを比較し、磁気インクの種類を決定
する。なお、積分器４３，４８の値がAD変換さ
れて読込まれると、CPU３０はタイミング信号
T1及びT3によつて積分器４３及び４８をリセツ
トする。なお、CPU３０が割算手段と比較判別
手段とに担当する。 After that, the CPU 30 stores the 2
By reading out the two integral values AI and DI and performing a division operation, the value of AI/DI, that is, Bm/Br, is determined.
This value is temporarily stored in the RAM 33. and,
The CPU 30 compares this value with a set value previously stored in the ROM 32 and determines the type of magnetic ink. Note that when the values of the integrators 43 and 48 are AD converted and read, the CPU 30 receives the timing signal.
Integrators 43 and 48 are reset by T1 and T3. Note that the CPU 30 is in charge of the division means and the comparison and determination means.
このように、差動型磁気ヘツド２０を残留磁気
検出型磁気ヘツド２１とを使用し、紙幣１０の全
長にわたつて最大磁束密度Bm及び残留磁束密度
Brの積分値AI及びDIを求め、その積分値の割算
から磁速密度の比Bm／Brを求めて磁気インクの
種類を決定するようにしている。すなわち、紙幣
１０を移動させると、磁気インクの量によつて最
大磁束密度Bmの検出値及び残留磁束密度Brの検
出値はそれぞれ時々刻々と変化するが、磁気イン
クの濃度が一様でない場合は同一検出位置に関し
てみれば、比Bm／Brはほぼ一定となつている
（Bm／Brは磁気インクの量ではなく、質によつ
て決まるものである）。従つて、紙幣１０の全長
にわたつて同一部分を走査し、その積分値を求め
て割算しても何ら問題はないのである。なお、磁
気インクの濃度が一様となている部分を有する紙
葉類の場合は、その位置では残留磁気検出型磁気
ヘツド２１から信号が出力されないため、当該位
置では比Bm／Brを求めることができないが、積
分値を求めるようにしているので問題はない。 In this way, by using the differential magnetic head 20 and the residual magnetism detection type magnetic head 21, the maximum magnetic flux density Bm and the residual magnetic flux density can be adjusted over the entire length of the banknote 10.
The type of magnetic ink is determined by determining the integral values AI and DI of Br, and dividing the integral values to determine the magnetic velocity density ratio Bm/Br. That is, when the banknote 10 is moved, the detected value of the maximum magnetic flux density Bm and the detected value of the residual magnetic flux density Br change from time to time depending on the amount of magnetic ink, but if the concentration of the magnetic ink is not uniform, As for the same detection position, the ratio Bm/Br is almost constant (Bm/Br is determined not by the quantity but by the quality of the magnetic ink). Therefore, there is no problem even if the same portion is scanned over the entire length of the banknote 10, and the integrated value is calculated and divided. In addition, in the case of a paper sheet that has a part where the concentration of magnetic ink is uniform, since no signal is output from the residual magnetism detection type magnetic head 21 at that position, the ratio Bm/Br must be calculated at that position. Although it is not possible to do this, there is no problem because we are trying to find the integral value.
発明の効果：
以上のように本発明によれば、磁気インクの最
大磁束密度と残留磁束密度との比を求め、この比
の値と設定値との比較を行なうことにより、紙葉
類の磁気インクの種類を確実に識別することがで
きる。Effects of the Invention: As described above, according to the present invention, by determining the ratio between the maximum magnetic flux density and the residual magnetic flux density of the magnetic ink and comparing the value of this ratio with a set value, the magnetic The type of ink can be reliably identified.
第１図Ａ〜Ｃは本発明の原理を説明するための
磁気特性図、第２図は本発明に適用し得る差動型
磁気ヘツドの構造図、第３図Ａ〜Ｃは本発明に適
用可能な磁気ヘツドの特性例を示す図、第４図は
本発明を実現する装置の一例を示すブロツク図、
第５図Ａは本発明装置の一実施例を示す平面図、
同図Ｂはその側面図、第６図はその回路構成例を
示すブロツク図、第７図Ａ，Ｂはその動作例を示
すタイミングチヤートである。
１，２０…差動型磁気ヘツド、２，２１…残留
磁気検出型磁気ヘツド、３，１０…紙幣、４…割
算器、５…比較判別回路、１１，２２…フオトセ
ンサ、１４〜１７…プーリ、２３…磁石、２６…
フオトインタラプタ、３０…CPU（コンピユー
タ）、３１…バスライン、３２…ROM、３３…
RAM、４３，４８…積分器、４４，４９…AD
変換器。
Figures 1A to C are magnetic characteristic diagrams for explaining the principle of the present invention, Figure 2 is a structural diagram of a differential magnetic head applicable to the present invention, and Figures 3A to C are applicable to the present invention. A diagram showing an example of the characteristics of a possible magnetic head; FIG. 4 is a block diagram showing an example of a device realizing the present invention;
FIG. 5A is a plan view showing an embodiment of the device of the present invention;
FIG. 6 is a block diagram showing an example of its circuit configuration, and FIGS. 7A and 7B are timing charts showing examples of its operation. DESCRIPTION OF SYMBOLS 1, 20... Differential type magnetic head, 2, 21... Residual magnetism detection type magnetic head, 3, 10... Bill, 4... Divider, 5... Comparison/discrimination circuit, 11, 22... Photo sensor, 14-17... Pulley , 23... magnet, 26...
Photo interrupter, 30...CPU (computer), 31...bus line, 32...ROM, 33...
RAM, 43, 48...integrator, 44, 49...AD
converter.
Claims (1)
差動型磁気ヘツド及び残留磁気検出型磁気ヘツド
と、前記差動型磁気ヘツド及び残留磁気検出型磁
気ヘツドの間の前記搬送路に設けられた磁石と、
前記差動型磁気ヘツドから出力される最大磁束密
度及び前記残留磁気検出型磁気ヘツドから出力さ
れる残留磁束密度を入力してその比を求める割算
手段と、前記割算手段で求められた比を入力して
設定値と比較することによつて、前記紙葉類の磁
性物質の種類を識別する比較判別手段とを具備し
たことを特徴とする紙葉類の磁性物質識別装置。1. A differential magnetic head and a residual magnetism detection type magnetic head disposed upstream and downstream of a conveyance path for paper sheets, and a magnetic head in the conveyance path between the differential magnetic head and the residual magnetism detection type magnetic head. With a magnet provided,
a dividing means for inputting the maximum magnetic flux density output from the differential magnetic head and the residual magnetic flux density output from the residual magnetism detection type magnetic head and calculating a ratio thereof; and a ratio obtained by the dividing means. 1. A magnetic material identification device for paper sheets, comprising: a comparison and determination means for identifying the type of magnetic material in the paper sheets by inputting a value and comparing it with a set value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57234687A JPS59120857A (en) | 1982-12-27 | 1982-12-27 | Method for assortment of magnetic material for sheet paper |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57234687A JPS59120857A (en) | 1982-12-27 | 1982-12-27 | Method for assortment of magnetic material for sheet paper |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59120857A JPS59120857A (en) | 1984-07-12 |
| JPH0452518B2 true JPH0452518B2 (en) | 1992-08-24 |
Family
ID=16974857
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57234687A Granted JPS59120857A (en) | 1982-12-27 | 1982-12-27 | Method for assortment of magnetic material for sheet paper |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59120857A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009163336A (en) * | 2007-12-28 | 2009-07-23 | Nidec Sankyo Corp | Magnetic pattern detection device |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0812234B2 (en) * | 1987-03-02 | 1996-02-07 | グローリー工業株式会社 | Method for detecting magnetic properties of magnetic thin film |
| JPH0812236B2 (en) * | 1987-06-15 | 1996-02-07 | グローリー工業株式会社 | Magnetic thin film magnetization characteristic measuring device |
| JPH0812235B2 (en) * | 1987-03-25 | 1996-02-07 | グローリー工業株式会社 | Magnetic thin film magnetization characteristic measuring device |
| JPH0260867U (en) * | 1988-10-26 | 1990-05-07 | ||
| JP4507585B2 (en) * | 2003-12-16 | 2010-07-21 | 日本電産サンキョー株式会社 | Drive circuit for paper sheet identification sensor and paper sheet identification device |
| JP4617483B2 (en) * | 2004-10-29 | 2011-01-26 | 独立行政法人 国立印刷局 | Discrimination method and discrimination device for printed matter |
| JP4629456B2 (en) * | 2005-02-28 | 2011-02-09 | 日立オムロンターミナルソリューションズ株式会社 | Paper sheet discrimination device |
| JP4926595B2 (en) * | 2006-08-07 | 2012-05-09 | アロン化成株式会社 | Fitting fitting aid |
| US7857114B2 (en) | 2008-07-07 | 2010-12-28 | Glory, Ltd. | Banknote discrimination apparatus and banknote discrimination method |
| JP5719515B2 (en) * | 2010-02-05 | 2015-05-20 | 日本電産サンキョー株式会社 | Magnetic sensor device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5215279A (en) * | 1975-07-25 | 1977-02-04 | Nec Corp | Semiconductor laser oscillator with mode selector |
| JPS52122193A (en) * | 1976-04-07 | 1977-10-14 | Emu Ii Esu Kk | Device for distinguishing correct paper money from false one |
| JPS5312370A (en) * | 1976-07-20 | 1978-02-03 | Toei Kogyo Kk | Device for automatically and contnuously measuring magnetization curve of magnetic substance |
| JPS5360535A (en) * | 1976-11-12 | 1978-05-31 | Hitachi Ltd | Detection of magnetic material by magnetic modulator of even higher harmonictype |
-
1982
- 1982-12-27 JP JP57234687A patent/JPS59120857A/en active Granted
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5215279A (en) * | 1975-07-25 | 1977-02-04 | Nec Corp | Semiconductor laser oscillator with mode selector |
| JPS52122193A (en) * | 1976-04-07 | 1977-10-14 | Emu Ii Esu Kk | Device for distinguishing correct paper money from false one |
| JPS5312370A (en) * | 1976-07-20 | 1978-02-03 | Toei Kogyo Kk | Device for automatically and contnuously measuring magnetization curve of magnetic substance |
| JPS5360535A (en) * | 1976-11-12 | 1978-05-31 | Hitachi Ltd | Detection of magnetic material by magnetic modulator of even higher harmonictype |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009163336A (en) * | 2007-12-28 | 2009-07-23 | Nidec Sankyo Corp | Magnetic pattern detection device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59120857A (en) | 1984-07-12 |
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