JPS5815823B2 - Jiseitaino Shikibetsu Sochi - Google Patents
Jiseitaino Shikibetsu SochiInfo
- Publication number
- JPS5815823B2 JPS5815823B2 JP50107370A JP10737075A JPS5815823B2 JP S5815823 B2 JPS5815823 B2 JP S5815823B2 JP 50107370 A JP50107370 A JP 50107370A JP 10737075 A JP10737075 A JP 10737075A JP S5815823 B2 JPS5815823 B2 JP S5815823B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- detection
- coil
- detection head
- printed matter
- 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
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/12—Measuring magnetic properties of articles or specimens of solids or fluids
- G01R33/1207—Testing individual magnetic storage devices, e.g. records carriers or digital storage elements
Landscapes
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Inspection Of Paper Currency And Valuable Securities (AREA)
- Recording Or Reproducing By Magnetic Means (AREA)
Description
【発明の詳細な説明】
本発明は、例えば磁気インクで印刷された紙幣等の磁気
印刷物の識別装置特にその検知回路の検知ヘッドに関す
るものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an identification device for magnetic printed matter such as banknotes printed with magnetic ink, and particularly to a detection head of a detection circuit thereof.
本発明者等は、磁気インクで印刷された磁気印刷物の識
別装置として、磁気印刷物に対向して配置されるギャッ
プを有する磁性材料コアにコイルを巻いて構成した検知
ヘッドと、一次側巻線および差動接続された一対の二次
側巻線を前記検知ヘッドのコイルに接続した差動変圧器
と、この差動変圧器の一次側巻側に接続した検知用信号
を発生する発振器と、前記差動変圧器の他方の二次側巻
線および前記検知ヘッドのコイルに接続され、磁性体の
検知信号を発生するバランス回路とを具えるものを考案
した。The present inventors have developed a detection head configured by winding a coil around a magnetic material core having a gap placed facing the magnetic print as an identification device for magnetic printed matter printed with magnetic ink, a primary winding and a differential transformer having a pair of differentially connected secondary windings connected to the coil of the detection head; an oscillator for generating a detection signal connected to the primary winding of the differential transformer; We have devised a balance circuit that is connected to the other secondary winding of the differential transformer and the coil of the detection head and generates a magnetic detection signal.
説明の便宜上、このような識別装置を以下従来装置とし
て説明する。For convenience of explanation, such an identification device will be described below as a conventional device.
磁気印刷物が検知回路の検知ヘッドを通過することによ
って得られる差動変圧器の検知信号出力をロックインア
ンプ等で増幅して磁気印刷物の識別を行なっていた。The detection signal output of a differential transformer obtained when a magnetic print passes through a detection head of a detection circuit is amplified by a lock-in amplifier or the like to identify the magnetic print.
そのような構成にしたため、磁気印刷物識別装置の検知
感度を高めるには検知ヘッドに巻いたコイルの巻き数を
増加させる必要があった。With such a configuration, it was necessary to increase the number of turns of the coil wound around the detection head in order to increase the detection sensitivity of the magnetic printed matter identification device.
しかし検知用信号の周波数が１〜１００ＫＨｚと比較的
高い周波数に選定されているので、ある程度以上は検知
ヘッドのコイルの巻き数を増加させることが出来ず、し
たがって大きな検知信号出力が得られないという欠点が
あった。However, since the frequency of the detection signal is selected to be a relatively high frequency of 1 to 100 KHz, it is not possible to increase the number of windings of the detection head coil beyond a certain point, and therefore a large detection signal output cannot be obtained. There were drawbacks.
このように従来装置の検知回路の検知ヘッドにおいては
、微小インダクタンス変化に対応する信号変化が小さい
ため、たとえ微小検知信号の増幅に適したロックインア
ンプを用いたとしても、誤動作をすることが多く、磁気
印刷物検出装置としての正確さが十分でないという欠点
があった。In this way, in the detection head of the detection circuit of conventional devices, the signal change corresponding to a minute inductance change is small, so even if a lock-in amplifier suitable for amplifying minute detection signals is used, malfunctions often occur. However, there was a drawback that the accuracy as a magnetic printed matter detection device was not sufficient.
本発明の目的は前述した従来の磁性体識別装置の欠点を
改善し、大きな検知信号出力を得ることができる高精度
の磁性体識別装置を提供せんとするものである。SUMMARY OF THE INVENTION An object of the present invention is to improve the drawbacks of the conventional magnetic material identification device described above and to provide a highly accurate magnetic material identification device that can obtain a large detection signal output.
本発明の磁性体の識別装置は、磁性材料コアにコイルを
巻き、ギャップと検知すべき印刷物を対向して配置させ
る構造にした検知ヘッドのコイルと差動変圧器の片方の
二次巻線との間にコンデンサーを直列に挿入して、それ
らが直列共振回路を構成するようにし、この直列共振回
路の共振周波数を発振器で発生される検知用信号の周波
数と一致させることを特徴とするものである。The magnetic body identification device of the present invention has a structure in which a coil is wound around a magnetic material core, and the gap and the printed material to be detected are arranged facing each other. A capacitor is inserted in series between the two to form a series resonant circuit, and the resonant frequency of this series resonant circuit is made to match the frequency of the detection signal generated by the oscillator. be.
以下図面を用いて本発明の実施例を詳細に説明する。Embodiments of the present invention will be described in detail below with reference to the drawings.
第１図は本発明識別装置を磁気印刷物識別装置として用
いる場合の一実施例を示す回路図である。FIG. 1 is a circuit diagram showing an embodiment in which the identification device of the present invention is used as a magnetic printed matter identification device.
検知ヘッド１は磁性材料コア２を具え、そのギャップに
接触または近接させて磁気インクで印刷された磁気印刷
物３を通過させる。The sensing head 1 comprises a magnetic material core 2 in contact with or in close proximity to the gap for passing a magnetic print 3 printed with magnetic ink.
前記検知ヘッド１のコア２にはコイル４が巻かれており
、このコイル４を共振用コンデンサー５を介して差動変
圧器６の片方の二次側巻線７の両端子間に接続する。A coil 4 is wound around the core 2 of the detection head 1, and this coil 4 is connected between both terminals of one secondary winding 7 of a differential transformer 6 via a resonance capacitor 5.
前記コイル４およびコンデンサー５は直列共振回路を構
成する。The coil 4 and capacitor 5 constitute a series resonant circuit.
前記差動変圧器６の一対の二次巻線７，８は差動接続さ
れており、一次巻数９には発振器１０が差動接続されて
いる。A pair of secondary windings 7 and 8 of the differential transformer 6 are differentially connected, and an oscillator 10 is differentially connected to the primary winding 9.
この発振器１０は周波数ｆ。This oscillator 10 has a frequency f.
においで発振し、差動変圧器６の一次側巻線９には検知
用信舎を供給する。It oscillates due to the smell, and supplies a detection signal to the primary winding 9 of the differential transformer 6.
可変抵抗器１１，１２とコンデンサー１３とで公知のバ
ランス回路１４を構成する。The variable resistors 11 and 12 and the capacitor 13 constitute a known balance circuit 14.
前記差動変圧器６の差動出力を前記バランス回路１４に
供給する。The differential output of the differential transformer 6 is supplied to the balance circuit 14 .
そのバランス回路１４の可変抵抗器１１および１２を適
当に調整して、本例では磁気印刷物の非検知時には差動
変圧器６の差動出力が相殺され、バランス回路１４の出
力が零となり、検知時にはバランス回路１４から検知信
号出力が発生されるように調整する。By appropriately adjusting the variable resistors 11 and 12 of the balance circuit 14, in this example, when a magnetic printed matter is not detected, the differential output of the differential transformer 6 is canceled out, the output of the balance circuit 14 becomes zero, and the detection At times, adjustments are made so that the balance circuit 14 generates a detection signal output.
この検知信号出力をロックインアンプ１５に供給する。This detection signal output is supplied to the lock-in amplifier 15.
このロックインアンプ１５には前記発振器１０から参照
信号を供給する。A reference signal is supplied to this lock-in amplifier 15 from the oscillator 10 .
検知信号出力はロックインアンプ１５で増幅され、印刷
物の識別出力を発生する。The detection signal output is amplified by a lock-in amplifier 15 to generate a print identification output.
次に本発明の動作について説明する。Next, the operation of the present invention will be explained.
今、磁気印刷物３が検知ヘッド１のギャップ付近にない
非検知時において、差動変圧器６の二次側巻線７から見
た検知ヘッド１のインピーダンス−周波数特性は第２図
の曲線■で表わされるものとなる。Now, when the magnetic printed matter 3 is not near the gap of the detection head 1 and is not detected, the impedance-frequency characteristic of the detection head 1 seen from the secondary winding 7 of the differential transformer 6 is shown by the curve ■ in Fig. 2. It becomes what is expressed.
すなイっち非検知時には直列共振回路４゜５の共振周波
数ｆ。In other words, when there is no detection, the resonant frequency f of the series resonant circuit 4°5.
は発振器１０の発振周波数ｆ。に等しいから、そのイン
ピーダンスは最小値となる。is the oscillation frequency f of the oscillator 10. Since it is equal to , its impedance is the minimum value.
次に磁気印刷物の検知時において、検失ロヘッド１のギ
ャップに接触または近接して磁気インクで印刷された印
刷物３がギャップを通過すると、印刷物表面の磁気イン
クによってコイル４のインダクタンスが変化する。Next, when detecting a magnetic printed matter, when a printed matter 3 printed with magnetic ink contacts or approaches the gap of the detection head 1 and passes through the gap, the inductance of the coil 4 changes due to the magnetic ink on the surface of the printed matter.
そのため共振回路４，５の共振周波数は印刷物３が検知
ヘッド１を通過する時、ｆｏからｆｌへと変化する。Therefore, the resonance frequency of the resonance circuits 4 and 5 changes from fo to fl when the printed matter 3 passes the detection head 1.
このとき差動変圧器６の二次側巻線７から見た検知ヘッ
ド１のインピーダンス−周波数特性は、第２図の曲線■
で表わされるものとなる。At this time, the impedance-frequency characteristic of the detection head 1 viewed from the secondary winding 7 of the differential transformer 6 is the curve
It will be expressed as.
すなイつち直列共振回路のインピーダンスはＺ。In other words, the impedance of the series resonant circuit is Z.
からＺｌへと大きく増加していることがわかる。It can be seen that there is a large increase from Zl to Zl.
このインピ−ダンスの増加によりバランス回路１４の平
衝がくずれ、ロックインアンプ１５から磁気印刷物を検
知したことを示す信号が供給される。This increase in impedance disturbs the equilibrium of the balance circuit 14, and a signal indicating that a magnetic printed matter has been detected is supplied from the lock-in amplifier 15.
従来の印刷物識別装置において、差動変圧器６の二次側
巻線７から見た検知ヘッド１のインピーダンス−周波数
特性は第３図の直線■、■で表わされる。In the conventional printed matter identification device, the impedance-frequency characteristics of the detection head 1 viewed from the secondary winding 7 of the differential transformer 6 are represented by straight lines ① and ② in FIG.
直線■は磁気印刷物非検知時におけるインピーダンス−
周波数特性を表わし、周波数ｆ。The straight line ■ is the impedance when no magnetic printed matter is detected.
Represents frequency characteristics, frequency f.
におけるインピーダンスはＺ′ｏになる。The impedance at is Z'o.
直線■は磁気印刷物検知時のインピーダンス−周波数特
性を表イつし、周波数ｆ。The straight line ■ represents the impedance-frequency characteristic when detecting magnetic printed matter, and the frequency f.
におけるインピーダンスは′７！１になる。The impedance at is '7!1.
従来の磁気印刷物識別装置の検知ヘッドと本発明の磁気
印刷物識別装置の検知ヘッドとを比較すると明らかなよ
うに、本発明においては磁気印刷物３が検知ヘッド１の
ギャップを通過するのに伴う微小インダクタンス変化に
よる差動変圧器６の二次側巻線７から見た検知ヘッド１
のインピーダンス変化△２＝２１−２ｏは、従来装置の
インピーダンス変化△ｌ−Ｚ′１−７１０よりも著しく
大きくなる。As is clear from a comparison between the detection head of the conventional magnetic print identification device and the detection head of the magnetic print identification device of the present invention, in the present invention, the minute inductance accompanying the magnetic print 3 passing through the gap of the detection head 1 is reduced. Sensing head 1 seen from the secondary winding 7 of the differential transformer 6 due to changes
The impedance change Δ2=21-2o is significantly larger than the impedance change Δl-Z'1-710 of the conventional device.
したがって本発明装置では、磁気印刷物検知時においで
インピーダンスが大きく増加するのに伴って差動変圧器
６の差動バランスが大きくくずれてロックインアンプ１
５に入力される検知信号を従来装置のものより大きく取
ることが出来るからより正確な印刷物の識別をすること
が出来る。Therefore, in the device of the present invention, as the impedance increases greatly when detecting magnetic printed matter, the differential balance of the differential transformer 6 is greatly disrupted, and the lock-in amplifier 1
Since the detection signal inputted to 5 can be larger than that of the conventional device, it is possible to identify printed matter more accurately.
上述したように本発明においては、印刷物検知回路の検
知ヘッド１に巻いたコイル４と共振コンデンサー５とで
直列共振回路を構成させ、この共振回路のＱ値を大きく
することにより、磁気印刷物の通過に伴うインダクタン
ス変化が微小な場合でも直列共振回路のインピーダンス
が大きく変化するようにして差動出力を十分大きく取る
ことが出来、正確な識別を行なうことが出来る。As described above, in the present invention, the coil 4 wound around the detection head 1 of the printed matter detection circuit and the resonant capacitor 5 constitute a series resonant circuit, and by increasing the Q value of this resonant circuit, the passage of the magnetic printed matter is prevented. Even if the change in inductance accompanying this change is minute, the impedance of the series resonant circuit can be made to change greatly, so that a sufficiently large differential output can be obtained, and accurate identification can be performed.
このように本発明によれば従来の識別装置に共振用コン
デンサーを追加するだけで極めて微量な磁性体が付着し
た磁気印刷物を極めて正確に識別することが出来るとい
う顕著な効果を得ることが出来る。As described above, according to the present invention, it is possible to obtain the remarkable effect that a magnetic printed matter to which an extremely small amount of magnetic material is attached can be identified extremely accurately simply by adding a resonant capacitor to a conventional identification device.
本発明は前述した例にのみ限定されるものではなく、幾
多の変更を加えることが出来る。The present invention is not limited to the examples described above, but can be modified in many ways.
例えば、バランス回路およびロックインアンプは前述し
た形式以外のものを用いることが出来る。For example, balance circuits and lock-in amplifiers of types other than those described above may be used.
また前述した例では、直列共振回路を非検知時に周波数
ｆ。Further, in the above-mentioned example, the frequency f when the series resonant circuit is not detected.
で共振させ、検知時に共振状態からずらせて検知信号を
発生させるようにしたが、その逆に、非検知時に共振状
態からずらせておき、検知時に周波数ｆ。When detecting, the resonance state is shifted from the resonance state and a detection signal is generated.However, conversely, when non-detection is occurring, the resonance state is shifted from the resonance state, and when detection is performed, the frequency f is generated.
で共振させるよう構成することも出来る。ただし、バラ
ンス回路における調整および共振状態を得るための回路
定数の設定等を考慮すると、第１図に示した実施例の方
が好適である。It is also possible to configure it so that it resonates. However, in consideration of adjustment in the balance circuit and setting of circuit constants for obtaining a resonant state, the embodiment shown in FIG. 1 is more suitable.
第１図は磁気印刷物識別装置として用いる本発明識別装
置の一実施例の構成を示す回路図、第２図は本発明装置
のインピーダンス−周波数特性を示すグラフ、第３図は
従来装置のインピーダンス−周波数特性を示すグラフで
ある。
１・・・・・・検知ヘッド、２・・・・・・コア、３・
・・・・・印刷物、４・・・・・・コイル、５・・・・
・・共振用コンデンサー、６・・・・・・差動変圧器、
７，８・・・・・・二次側巻線、９・・・・・・一次側
巻線、１０・・・・・・発振器、１４・・・・・・バラ
ンス回路、１す−−−−−−ロツクインアンプ。Fig. 1 is a circuit diagram showing the configuration of an embodiment of the present invention identification device used as a magnetic printed matter identification device, Fig. 2 is a graph showing the impedance-frequency characteristics of the present invention device, and Fig. 3 is the impedance-frequency characteristic of the conventional device. It is a graph showing frequency characteristics. 1...Detection head, 2...Core, 3.
...Printed matter, 4...Coil, 5...
... Resonance capacitor, 6... Differential transformer,
7, 8... Secondary winding, 9... Primary winding, 10... Oscillator, 14... Balance circuit, 1... −−−−Lock-in amplifier.
Claims (1)
れるギャップを有する磁性材料コアにコイルを巻いて構
成した検知ヘッドと、一次側巻線および差動接続された
一対の二次側巻線を有し、一方の二次側巻線を前記検知
ヘッドのコイルに接続した差動変圧器と、この差動変圧
器の一次側巻線に接続した検知用信号を発生する発振器
と、前記差動変圧器の他方の二次側巻線および前記検知
ヘッドのコイルに接続され、磁性体の検知信号を発生す
るバランス回路とを具える磁性体の識別装置において、
前記検知ヘッドのコイルと前記差動変圧器の二次側巻線
との間にコンデンサーを直列に挿入して直列共振回路を
構成し、その直列共振周波数を前記発振器から発生され
る検知用信号の周波数と一致させたことを特徴とする磁
性体の識別装置。1 A detection head configured by winding a coil around a magnetic material core having a gap placed near a magnetic printed matter printed with magnetic ink, a primary winding and a pair of differentially connected secondary windings. a differential transformer having one secondary winding connected to the coil of the detection head; an oscillator that generates a detection signal connected to the primary winding of the differential transformer; A magnetic body identification device comprising a balance circuit connected to the other secondary winding of the transformer and the coil of the detection head and generating a magnetic body detection signal,
A capacitor is inserted in series between the coil of the detection head and the secondary winding of the differential transformer to form a series resonant circuit, and the series resonant frequency is set to the detection signal generated from the oscillator. A magnetic substance identification device characterized by matching the frequency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP50107370A JPS5815823B2 (en) | 1975-09-04 | 1975-09-04 | Jiseitaino Shikibetsu Sochi |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP50107370A JPS5815823B2 (en) | 1975-09-04 | 1975-09-04 | Jiseitaino Shikibetsu Sochi |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5230410A JPS5230410A (en) | 1977-03-08 |
| JPS5815823B2 true JPS5815823B2 (en) | 1983-03-28 |
Family
ID=14457364
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP50107370A Expired JPS5815823B2 (en) | 1975-09-04 | 1975-09-04 | Jiseitaino Shikibetsu Sochi |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5815823B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS593134B2 (en) * | 1979-08-31 | 1984-01-23 | 千代田技研工業株式会社 | Immediate demolding machine for concrete products |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3842407A (en) * | 1972-06-30 | 1974-10-15 | Ibm | Inductive sensor for magnetic bubble domain detection |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4980626U (en) * | 1972-11-01 | 1974-07-12 | ||
| JPS5344336Y2 (en) * | 1973-05-10 | 1978-10-24 |
-
1975
- 1975-09-04 JP JP50107370A patent/JPS5815823B2/en not_active Expired
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3842407A (en) * | 1972-06-30 | 1974-10-15 | Ibm | Inductive sensor for magnetic bubble domain detection |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5230410A (en) | 1977-03-08 |
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