JPH08199498A - Safety protected paper and device for judging its truth or falsehood - Google Patents

Safety protected paper and device for judging its truth or falsehood

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Publication number
JPH08199498A
JPH08199498A JP1834395A JP1834395A JPH08199498A JP H08199498 A JPH08199498 A JP H08199498A JP 1834395 A JP1834395 A JP 1834395A JP 1834395 A JP1834395 A JP 1834395A JP H08199498 A JPH08199498 A JP H08199498A
Authority
JP
Japan
Prior art keywords
safety
magnetic
magnetic field
exciting
paper
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.)
Granted
Application number
JP1834395A
Other languages
Japanese (ja)
Other versions
JP3271865B2 (en
Inventor
Aiichiro Hara
愛一郎 原
Yasumasa Kawaguchi
泰正 川口
Ichiro Mizukami
一郎 水上
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.)
Iwatsu Electric Co Ltd
National Printing Bureau
Original Assignee
Printing Bureau Ministry of Finance
Iwatsu Electric Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Printing Bureau Ministry of Finance, Iwatsu Electric Co Ltd filed Critical Printing Bureau Ministry of Finance
Priority to JP01834395A priority Critical patent/JP3271865B2/en
Publication of JPH08199498A publication Critical patent/JPH08199498A/en
Application granted granted Critical
Publication of JP3271865B2 publication Critical patent/JP3271865B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Abstract

PURPOSE: To obtain safety protected paper having extremely high guarantee and to provide a device for judging its truth or falsehood. CONSTITUTION: This safety protected paper is obtained by embedding a safety filament comprising a simple substance of a ferromagnetic material having specific magnetic hysteresis characteristics or a material of a ferromagnetic material using a composite material, obtained by laminating the simple substance to a resin film, in paper. The device to judge the truth or falsehood of the safety protected paper is provided with a magnetizing means having an electric source adjustable to alter the width of change in magnetic field strength at plural stages to magnetize the embedded safety filament from the outside, indicates the magnetic hysteresis characteristics of the magnetized safety filament or measures a frequency spectrum contained in the change in magnetic flux density detected from the safety filament, compares the indicated magnetic hysteresis characteristics or the measured frequency spectrum measured with true ones and judges the truth or falsehood of the paper.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、証券類のように偽造防
止を必要とする安全保護紙とその真偽判定装置に関する
ものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a security paper that requires forgery prevention, such as securities, and an authenticity judging device therefor.

【0002】[0002]

【従来の技術】従来、証券類等の安全保護紙の偽造防止
対策としてホログラム印刷のような一般に偽造困難な特
殊印刷技術によるものや、磁気インクによる図柄の塗布
によるものや、紫外線あるいは赤外線に反応するインク
印刷によるもの、又は樹脂,糸,あるいは金属片を安全
線条として紙の中に埋め込むものが一般的に知られてい
る。このような安全線条を備えた証券類等の真偽を判定
するには、紫外線あるいは赤外線を照射して、反射,吸
収の量を検出する方法や、電磁波による反射,吸収,磁
気変化を検出する方法が知られている。また、本願出願
人が先に提案した安全線条に強磁性体の箔,糸,薄膜を
用いて、安全保証用データを記憶させた構成を用いた
り、素材の有する磁気特性を利用して安全保護紙の真偽
判定する方法もある(特願平5−196688号「安全
保護紙とその真偽判定装置」参照)。強磁性体を安全線
条として利用した場合、大バルクハウゼン効果やマチウ
シ効果、あるいは熱,スリット幅による磁気強度の変化
を磁気ヘッドや磁気コイルなどの外部検知装置により検
出し、電圧値に変換しその振幅幅により意味のあるデー
タとして利用してきた(本願出願人が先に出願した特願
平6−291994号「安全保護紙とその真偽判定装
置」参照)。
2. Description of the Related Art Conventionally, as a measure for preventing forgery of security paper such as securities, a special printing technique such as hologram printing, which is generally difficult to forge, a pattern applied with magnetic ink, a reaction to ultraviolet rays or infrared rays It is generally known to use ink printing or to embed resin, thread, or metal pieces in paper as a safety wire. In order to judge the authenticity of securities, etc. with such a safety line, there is a method of detecting the amount of reflection or absorption by irradiating ultraviolet rays or infrared rays, or detecting the reflection, absorption or magnetic change by electromagnetic waves. It is known how to do it. In addition, the applicant has previously proposed a safety wire using a foil, a thread, and a thin film made of a ferromagnetic material to store data for safety assurance, and using the magnetic properties of the material to ensure safety. There is also a method of judging the authenticity of the protective paper (see Japanese Patent Application No. 5-196688 "Safety protective paper and its authenticity judging device"). When a ferromagnetic material is used as a safety wire, the large Barkhausen effect, Machiushi effect, or changes in magnetic intensity due to heat or slit width are detected by an external detection device such as a magnetic head or magnetic coil, and converted into a voltage value. It has been used as meaningful data due to its amplitude width (see Japanese Patent Application No. 6-291994 “Safety Protective Paper and Its True / False Judging Device” filed earlier by the applicant).

【0003】[0003]

【発明が解決しようとする課題】強磁性体を安全線条と
して利用する構成は、単なる樹脂あるいは金属片を用い
る構成に比べデータの記録容量の大きさおよび記録デー
タの外部環境に対する強靱性がともに優れたものであ
る。しかしながら、強磁性体材料は特殊なものとはいえ
一般に絶対入手不可能とはいえず、今まで行われていた
単なる磁気特性上の大バルクハウゼン効果や磁気飽和特
性を利用した振幅値のみの検出比較では安全線条に用い
ている飽和磁性特性と極めて近い飽和磁性特性を持った
材料で偽造されるおそれがある。すなわち大バルクハウ
ゼン現象は現在使用されている変圧器や磁気コアの材料
をもってすれば近似させることが再現可能であり、飽和
磁気特性は励磁強度に対し強磁性材の寸法形状によって
変化することができるので、たとえ特異な飽和磁気特性
を有する材料を用いたとしても同等特性による偽造のお
それがある。合金比率と製法により容易に偽造のできな
い磁気特性を有する強磁性体をその材料そのものである
と判別する手法があれば安全性は高くなり、これを用い
た安全保護紙の利用価値を高めることができる。
A structure using a ferromagnetic material as a safety wire has both a large data recording capacity and a high toughness of the recorded data with respect to the external environment, as compared with a structure using a simple resin or metal piece. It is excellent. However, although ferromagnetic materials are special ones, they cannot be said to be absolutely unavailable, and detection of only amplitude values using the large Barkhausen effect on magnetic characteristics and magnetic saturation characteristics that have been performed up to now. In comparison, there is a risk of forgery with a material having a saturation magnetic property very close to the saturation magnetic property used for the safety wire. In other words, the large Barkhausen phenomenon can be approximated by using the materials of transformers and magnetic cores currently used, and the saturation magnetic characteristics can be changed by the size and shape of the ferromagnetic material with respect to the excitation strength. Therefore, even if a material having a unique saturation magnetic property is used, there is a risk of forgery due to the equivalent property. If there is a method that distinguishes a ferromagnetic material that has magnetic properties that cannot be easily counterfeited by the alloy ratio and manufacturing method as the material itself, the safety will be high and the utility value of the safety protection paper using this will be increased. it can.

【0004】本発明は、このような従来技術の欠点を考
慮し、極めて安全保証性の高い安全保護紙とその真偽判
定装置を提供するものである。
In view of the above-mentioned drawbacks of the prior art, the present invention provides a safety protection paper and a genuineness / counterfeiting apparatus for the same, which are extremely safe and secure.

【0005】[0005]

【課題を解決するための手段】この目的を達成するため
に、本発明による安全保護紙は、特異な磁気履歴特性を
有する強磁性体単体、あるいは樹脂膜と張り合わせた複
合材を用いた強磁性体材料からなる安全線条を埋め込ん
だものである。また、このような安全保護紙が真正であ
るかどうかを判定するために、その埋め込まれた安全線
条を外部から励磁する磁界強度の変化幅を複数段階で変
化するように調整することができる電源を有する励磁手
段を備え、励磁された安全線条の磁気履歴特性を表示す
るか、又は、その安全線条から検出した磁束密度変化に
含まれる周波数スペクトラムを測定して、表示された磁
気履歴特性又は測定された周波数スペクトラムを真正の
ものと比較して真偽判別する構成をとっている。
In order to achieve this object, the safety protection paper according to the present invention is made of a ferromagnetic substance having a unique magnetic hysteresis characteristic or a ferromagnetic substance using a composite material laminated with a resin film. It is a safety wire embedded with body material. Further, in order to determine whether or not such a safety protection paper is authentic, it is possible to adjust the change width of the magnetic field strength for externally exciting the embedded safety wire to change in multiple steps. An exciting means having a power source is provided, and the magnetic history characteristic of the excited safety wire is displayed, or the frequency spectrum included in the magnetic flux density change detected from the safety wire is measured, and the displayed magnetic history is displayed. The characteristic or measured frequency spectrum is compared with that of a genuine one to determine whether it is true or false.

【0006】[0006]

【作用】本発明による安全保護紙は、特異な磁気履歴特
性を有する強磁性体単体を埋め込んでいるので偽造が困
難であり、安全性が極めて高い。また、本発明による真
偽判定装置は、上記のような本発明による安全保護紙を
対象物としてその真偽判定を容易かつ確実に行うことが
できるめため、安全保護紙の取扱い信用性を著しく高め
る効果がある。
The safety protection paper according to the present invention is extremely safe because it is difficult to forge because it is embedded with a single ferromagnetic material having a unique magnetic hysteresis characteristic. Further, since the authenticity determination device according to the present invention can easily and reliably determine the authenticity of the above-described security paper according to the present invention as an object, the reliability of handling the security paper is remarkably high. Has the effect of increasing.

【0007】[0007]

【実施例】本発明を説明するにあたり、まず本発明の基
本的原理について述べる。強磁性体の磁化特性は次のよ
うに表される。
EXAMPLES In explaining the present invention, the basic principle of the present invention will be described first. The magnetization characteristic of a ferromagnetic material is expressed as follows.

【数1】B=μH ………(1) B:磁束密度, H:磁界の強さ, μ:透磁率 ただし、μは一般的に線形ではなく磁性材固有の非線形
特性を持っている。この特性はいわゆるB−Hカーブ特
性として磁性材料の非線形磁気特性を表現する方法とし
て用いられている。強磁性体の磁化は磁界がゼロでも残
留磁化Mrが残る。一度飽和に達した磁化をゼロにする
ために逆向きに加えなければならない磁界(Hc:保持
力)を有するため履歴曲線(ヒステリシスループ)を描
く。これは、強磁性体の理論によれば強磁性体が多くの
分域(ドメイン)に分かれ磁化は各ドメインの磁化ベク
トルの和を持つためである。外部より飽和交流磁界を加
え、次第に磁界を弱くして行ったときの履歴曲線は各強
磁性体により異なる。この変化を代表的例をもって示
す。図1(a)は非線形の履歴曲線と線形の部分が存在
する特性を持つタイプ1の強磁性体である。図1(b)
は非線形の履歴曲線がほぼ同形で保持される特性を持つ
タイプ2の強磁性体である。図1(c)は非線形の履歴
曲線が相似曲線で次第に小さくなる特性を持つタイプ3
の強磁性体である。このような物質特有のもつ特性を検
査することで、それが真の材料であることを判別するこ
とができる。
## EQU1 ## B = μH (1) B: magnetic flux density, H: magnetic field strength, μ: permeability However, μ is generally not linear but has a non-linear characteristic peculiar to magnetic materials. This characteristic is used as a method for expressing the non-linear magnetic characteristic of the magnetic material as a so-called BH curve characteristic. Regarding the magnetization of the ferromagnetic material, the residual magnetization Mr remains even if the magnetic field is zero. A hysteresis curve (hysteresis loop) is drawn because it has a magnetic field (Hc: coercive force) that must be applied in the opposite direction to zero the magnetization once reaching saturation. This is because, according to the theory of ferromagnets, the ferromagnet is divided into many domains and the magnetization has the sum of the magnetization vectors of the domains. The hysteresis curve obtained when a saturated AC magnetic field is applied from the outside to gradually weaken the magnetic field differs depending on each ferromagnetic material. This change is shown by a typical example. FIG. 1A shows a type 1 ferromagnetic material having a characteristic that a non-linear hysteresis curve and a linear portion exist. Figure 1 (b)
Is a type 2 ferromagnet having a characteristic that the nonlinear hysteresis curve is kept substantially the same. FIG. 1C shows a type 3 having a characteristic that the non-linear history curve is a similarity curve and gradually decreases.
Is a ferromagnetic material. By inspecting the characteristics peculiar to such a substance, it can be determined that it is a true material.

【0008】一般には、一履歴曲線で強磁性体の材料判
別を行おうとした場合、履歴曲線が極めて類似な物質で
あるとき、被検査材料の大きさを適度に調整したものを
用いることで判別が極めて困難になるおそれがあるが、
本発明方式によると履歴曲線の変化の度合いを目視また
は自動測定することで物質固有の特性を見いだすことが
でき、真偽判定に極めて有効である。履歴曲線の変化を
測定する方法として、図1(a),(b),(c)に示
す各タイプのような履歴曲線の変化を表示器の表面上で
目視により判定することもできるが、外部交流磁界によ
る磁束密度変化に含まれる周波数スペクトラム分析法を
用いることもできる。これは履歴曲線の非線形性が外部
交流励磁周波数の倍数の比で出力され、この周波数成分
の各次数における大きさは各強磁性体固有の値をもつの
で、ある固有値を持った強磁性体の値を予め知っておく
ことで、その物質であることを簡単かつ、正確に判別す
ることができることになる。
Generally, when it is attempted to determine the material of a ferromagnetic material by using one hysteresis curve, when the history curves are very similar substances, the material to be inspected is appropriately adjusted in size to make the determination. Can be extremely difficult,
According to the method of the present invention, the characteristic peculiar to the substance can be found by visually or automatically measuring the degree of change of the history curve, which is extremely effective for the authenticity determination. As a method of measuring the change of the history curve, the change of the history curve such as each type shown in FIGS. 1A, 1B, and 1C can be visually determined on the surface of the display. It is also possible to use a frequency spectrum analysis method included in the magnetic flux density change due to an external alternating magnetic field. This is because the non-linearity of the hysteresis curve is output at the ratio of the multiple of the external AC excitation frequency, and the magnitude of this frequency component in each order has a value peculiar to each ferromagnet. By knowing the value in advance, it is possible to easily and accurately determine that it is the substance.

【0009】次に具体的実施例について説明する。図2
乃至図7は本発明の第一の実施例であって、1は安全線
条の施された証券である。2は安全線条でポリエチレン
等化学樹脂に強磁性体を施したもので、ある合金比率、
たとえばCo,Zr,Mo材料からなる強磁性体合金で
あれば(Co)x(Zr)y (Mo)z の組成x,y,
zと、製造時の条件、すなわち、例えばスパッタ製法で
あれば真空度,封入ガス種,スパッタ時間等により決ま
った履歴曲線を描く強磁性体を得ることができ、作られ
た条件以外では同一の履歴曲線を描くことは困難なもの
である。この安全線条には本願出願人が先に提案した特
願平6−291994号「安全保護紙とその真偽判定装
置」で示されたように意味のある情報を記録することが
できる。
Next, specific examples will be described. Figure 2
7 to 7 show a first embodiment of the present invention, in which 1 is a security-lined security. 2 is a safety wire made of a chemical resin such as polyethylene with a ferromagnetic material, and has a certain alloy ratio,
For example, in the case of a ferromagnetic alloy composed of Co, Zr, and Mo materials, the composition x, y, (Co) x (Zr) y (Mo) z ,
z and the manufacturing conditions, that is, for example, in the case of the sputtering method, a ferromagnetic material can be obtained which draws a hysteresis curve determined by the degree of vacuum, the enclosed gas species, the sputtering time, etc. It is difficult to draw a history curve. In this safety line, meaningful information can be recorded as shown in Japanese Patent Application No. 6-291994 “Safety Protective Paper and Its True / False Judging Device” previously proposed by the applicant.

【0010】図3は真偽判定装置Aaの概念図である。
3は安全線条を励起するための交流電源である。4は励
起コイルに流す電流をコントロールするための抵抗(R
1 ,R2 ,R3 )である。交流電源3がVoなる電圧で
あれば、励磁電流制御スイッチ5によりVo/(R1+
RL),Vo(R1+R2+RL),Vo/(R1+R
2+R3+RL)なる強さの異なる励磁電流が得られ
る。もし必要があればスイッチの切り替え段数を増やす
か可変抵抗にしてもよく、また交流電源3の電圧Voを
変えることで同じ効果を得ることができる。電流コント
ロールの指示ICは判定回路10より与えられ、どの程
度の強さで励磁しているかが常にモニターすることがで
きるようにしておく。6は強磁性体でできた安全線条を
励起するための励起コイルRL である。効率よく安全線
条を励起するために透磁率の大きなコアをコイルの中心
に入れる手段も有効である。7は励磁された安全線条2
からの磁束密度の変化を検出する磁気ヘッドである。磁
気ヘッド7以外でも磁束密度の変化を検出できるもので
あればホール素子,MR素子,磁気コイル等を使用して
も同様な効果を得ることができる。8は磁気センサー
(磁気ヘッド)7によって検出した磁束密度の変化に比
例した電圧を増幅するための増幅器である。9は周波数
分析器である。10は判定回路でありマイコン等を利用
でき、安全線条がある励磁磁界の強度により決められた
周波数成分を持つことから、予想される周波数成分値と
比較して一致していれば検査された安全保護紙は真正で
あるとし、違っていれば偽造であると判断する。
FIG. 3 is a conceptual diagram of the authenticity determination device Aa.
3 is an AC power supply for exciting the safety line. 4 is a resistance (R
1 , R 2 , R 3 ). If the voltage of the AC power supply 3 is Vo, Vo / (R1 +
RL), Vo (R1 + R2 + RL), Vo / (R1 + R)
Exciting currents having different strengths of (2 + R3 + RL) are obtained. If necessary, the number of switching stages may be increased or a variable resistor may be used, and the same effect can be obtained by changing the voltage Vo of the AC power supply 3. The current control instruction IC is given from the determination circuit 10 so that it can be constantly monitored how strong the excitation is. Reference numeral 6 is an excitation coil R L for exciting the safety wire made of a ferromagnetic material. In order to efficiently excite the safety wire, it is effective to insert a core having a large magnetic permeability into the center of the coil. 7 is excited safety wire 2
It is a magnetic head that detects a change in magnetic flux density from. The same effect can be obtained by using a Hall element, an MR element, a magnetic coil, or the like as long as the change in the magnetic flux density can be detected other than the magnetic head 7. Reference numeral 8 is an amplifier for amplifying a voltage proportional to the change in the magnetic flux density detected by the magnetic sensor (magnetic head) 7. 9 is a frequency analyzer. Reference numeral 10 is a determination circuit, which can use a microcomputer or the like, and has a safety wire having a frequency component determined by the strength of an exciting magnetic field. Therefore, it is inspected if the frequency components match the expected frequency component value. If the security paper is authentic, it is judged to be counterfeit if it is different.

【0011】図4は周波数分析器9の一構成図である。
増幅器8を介して入力された安全線条2からの磁気信号
は分析上限周波数以上をローパスフィルタ9aによりカ
ットする。帯域制限されたアナログ信号はA/D変換器
9bによりディジタル信号に変換される。ディジタル化
された信号は一時メモリ(1)9cに記憶される。メモ
リ(1)9cに記憶された情報はFFT演算器9dでフ
ーリエ変換され周波数スペクトラム成分に変換される。
変換された周波数スペクトラム成分はメモリ(2)9e
に記憶され分析結果として判断時に参照される。これら
の制御は主制御部9fにより行われる。
FIG. 4 is a block diagram of the frequency analyzer 9.
The magnetic signal from the safety wire 2 input through the amplifier 8 cuts the analysis upper limit frequency or higher by the low pass filter 9a. The band-limited analog signal is converted into a digital signal by the A / D converter 9b. The digitized signal is stored in the temporary memory (1) 9c. The information stored in the memory (1) 9c is Fourier transformed by the FFT calculator 9d to be converted into a frequency spectrum component.
The converted frequency spectrum component is stored in the memory (2) 9e.
Are stored in the memory and are referred to at the time of judgment as the analysis result. These controls are performed by the main controller 9f.

【0012】図5および図6は透磁率等の磁気物性が良
く似た2種類の強磁性体について本方式でそれぞれ分析
した結果である。図5の(a),(b),(c)と図6
の(a),(b),(c)は、(a),(b),(c)
それぞれ励磁磁界の強度を変え、そのときのスペクトラ
ム強度を測定したものである。横軸は周波数(Hz)、
縦軸はスペクトラムのパワー強度(V)である。グラフ
上では比較しやすくするため励起スペクトラムは除いて
ある。図5の(a),(b),(c)に示す強磁性体は
図1(c)に示すタイプ3に相当し、励磁磁界の強度に
比例し各スペクトラム強度は大きくなっており、図6の
(a),(b),(c)に示す強磁性体は図1(b)に
示すタイプ2に相当し、励磁磁界の強度にそれほど関係
していないことが判る。判定回路10ではこのようにし
て各励磁磁界の強度におけるスペクトラム強度を真の材
料の値と比較し一致,不一致で真偽判定を行う。この判
定回路10は一般にマイクロコンピュータを利用したも
ので、前述周波数分析器9の分析結果を読み出す機能と
励磁電流を制御する機能と、真の材料のスペクトラム強
度を予め記憶する機能とを有する。周波数分析器9の有
する機能をこのマイクロコンピュータで行わせることも
可能である。
FIGS. 5 and 6 show the results of the analysis of two types of ferromagnetic materials having similar magnetic properties such as magnetic permeability by this method. 5 (a), (b), (c) and FIG.
(A), (b), (c) are (a), (b), (c)
The intensity of the exciting magnetic field was changed, and the spectrum intensity at that time was measured. The horizontal axis is frequency (Hz),
The vertical axis represents the power intensity (V) of the spectrum. The excitation spectrum is omitted from the graph for easier comparison. The ferromagnetic substance shown in (a), (b), and (c) of FIG. 5 corresponds to the type 3 shown in FIG. 1 (c), and each spectrum intensity increases in proportion to the intensity of the exciting magnetic field. It can be seen that the ferromagnetic bodies shown in (a), (b) and (c) of 6 correspond to the type 2 shown in FIG. 1 (b) and are not so closely related to the strength of the exciting magnetic field. In this way, the judgment circuit 10 compares the spectrum intensity in the strength of each exciting magnetic field with the value of the true material and makes a true / false decision based on whether they match or not. The determination circuit 10 generally uses a microcomputer and has a function of reading the analysis result of the frequency analyzer 9, a function of controlling the exciting current, and a function of storing the spectrum intensity of the true material in advance. The function of the frequency analyzer 9 can be performed by this microcomputer.

【0013】図7に判定回路10の行う手順をフローチ
ャートで示す。真偽制御作業にあたり、真偽判定装置A
aの励磁電流制御スイッチ5を作動(オン)させると
(S1 )、周波数分析器9により周波数分析記が開始さ
れる(S2 )。その分析結果は周波数スペクトラム成分
値βとしてメモリ(2)9eに記憶される(S3 )。判
定回路10では励磁電流Icを調整し、調整が終了する
と(S4 )、予め記憶されている真の材料のスペクトラ
ム成分値αを読み出すとともに(S5 )、分析結果βも
メモリ(2)9eから読み出され、両者の成分値αとβ
が比較される(S6 )。この比較の結果真の材料のスペ
クトラム成分値αと分析結果βが一致していれば
(S7 )、真正の安全保護紙1(本物)であると判定し
(S8 )、不一致の場合は偽造の安全保護紙1(偽物)
であると判定する(S9 )。以上のような判定手順によ
り安全保護紙1の真偽判定を行う。
FIG. 7 is a flowchart showing the procedure performed by the determination circuit 10. In authenticity control work, authenticity determination device A
When the exciting current control switch 5 of a is operated (turned on) (S 1 ), the frequency analyzer 9 starts the frequency analysis (S 2 ). The analysis result is stored in the memory (2) 9e as the frequency spectrum component value β (S 3 ). The determination circuit 10 adjusts the excitation current Ic, and when the adjustment is completed (S 4 ), the spectrum component value α of the true material stored in advance is read (S 5 ), and the analysis result β is also stored in the memory (2) 9e. And the component values α and β of both
Are compared (S 6 ). As a result of this comparison, if the spectrum component value α of the true material and the analysis result β match (S 7 ), it is determined to be the genuine safety protection paper 1 (genuine) (S 8 ), and if they do not match, Counterfeit security paper 1 (counterfeit)
Determines that the (S 9). The authenticity of the safety protection paper 1 is determined by the above determination procedure.

【0014】図8は本発明の第二の実施例を示す真偽判
定装置Abの概念図であり、図9はB−H図発生器の一
構成例図である。第一の実施例と同一符号は同等物を示
し説明を省略する。この実施例は、磁気特性表示手段に
より磁性材判別をするための一実施例である。11は磁
気特性図であるB−H図を発生させる図発生器であり、
12はB−H図発生器より出力されるB−H図を表示す
るための表示器であり、X−YレコーダあるいはX−Y
スコープあるいはCRTディスプレイと同等機能を持っ
たものである。安全線条2より発せられた磁束密度の変
化は磁気ヘッド7で検知され、増幅器8で増幅された磁
気検出信号V1と励磁コイル6からの励磁信号V2は、
それぞれA/D変換器11a,11eによりデジタル化
される。検出された電圧V1と磁束密度Bは次の式から
得られる。すなわち、
FIG. 8 is a conceptual diagram of a true / false determination device Ab showing a second embodiment of the present invention, and FIG. 9 is a block diagram of a BH diagram generator. The same reference numerals as those in the first embodiment indicate the same components, and the description thereof will be omitted. This embodiment is one for discriminating the magnetic material by the magnetic characteristic display means. Reference numeral 11 is a diagram generator for generating a BH diagram which is a magnetic characteristic diagram,
Reference numeral 12 is a display for displaying the BH diagram output from the BH diagram generator, which is an XY recorder or an XY recorder.
It has the same function as a scope or CRT display. The change in the magnetic flux density generated from the safety wire 2 is detected by the magnetic head 7, and the magnetic detection signal V1 amplified by the amplifier 8 and the excitation signal V2 from the excitation coil 6 are
It is digitized by the A / D converters 11a and 11e, respectively. The detected voltage V1 and magnetic flux density B are obtained from the following equations. That is,

【数2】e=−dφ/dt ……(2)(ファラデ
ィーの誘導法則) e:起電力 φ:検知コイルを貫く磁束 から、磁束密度Bは検出信号V1を積分演算器11bに
より積分して得られる。また、アンペールの法則から
## EQU00002 ## e = -d.phi. / Dt (2) (Faraday's induction law) e: electromotive force .phi .: magnetic flux penetrating the detection coil. From the magnetic flux density B, the detection signal V1 is integrated by the integration calculator 11b. Obtained. Also, from Ampere's law

【数3】∫H・ds=ΣI ……(3) H:磁界 I:局面を貫く電流 であるから、安全線条2を励起する磁界Hは励磁コイル
に流す電流Iに比例する。コイルを流れる電流Iとコイ
ル端子に現れる電圧eは
[Equation 3] ∫H · ds = ΣI (3) H: magnetic field I: current penetrating the phase, so the magnetic field H exciting the safety wire 2 is proportional to the current I flowing in the exciting coil. The current I flowing through the coil and the voltage e appearing at the coil terminal are

【数4】e=−L・dI/dt ……(4) e:起電圧 L:コイルのインダクタンス であるから、磁界Hは励磁信号V2を積分演算器11f
により積分して得られる。積分演算器11b,11fは
電圧値として検出した信号を実際のB,Hに変換するた
めのものである。変換された信号は各B,Hの強度に対
応づけたメモリ(1)11cおよび(2)11gの番地
に相当する箇所に記録される。励磁強度を変えて得られ
た数本のB−H図がメモリ(1)11cおよび(2)1
1gに記録される。メモリ(1)11cおよび(2)1
1gから読み出された記録内容はD/A変換器11d,
11hによりアナログ値に変換され、Bの値は表示器1
2のY軸(垂直偏向),Hの値はX軸(水平偏向)とさ
れる。この例では、A/D変換器11a,11eにより
デジタル化して処理しているが、アナログ値のまま表示
器12に表示させるようにすることは容易に可能であ
る。従って、安全保護紙1が真偽判定装置Abにより真
偽チェックをされると、強磁性体固有のパターンを有す
る磁気履歴特性を示すB−H図が表示器12に出力表示
されるので、予め認識している図1(a),(b),
(c)等の真の磁性体の各タイプのパターンと目視によ
り視覚的に対比することにより簡易に真偽の判定をする
ことができる。すなわち、対比により両パターンが一致
していれば真正、不一致が確認されればその安全保護紙
1は偽造と判定される。
## EQU4 ## e = -L.dI / dt (4) e: electromotive voltage L: coil inductance, so that the magnetic field H causes the excitation signal V2 to be the integral calculator 11f.
It is obtained by integrating. The integration calculators 11b and 11f are for converting the signals detected as voltage values into actual B and H. The converted signal is recorded in the locations corresponding to the addresses of the memories (1) 11c and (2) 11g associated with the intensities of B and H, respectively. Several BH diagrams obtained by changing the excitation intensity are shown in memories (1) 11c and (2) 1
Recorded in 1 g. Memories (1) 11c and (2) 1
The recorded contents read from 1g are the D / A converters 11d,
It is converted into an analog value by 11h, and the value of B is displayed on the display 1
The Y-axis (vertical deflection) of 2 and the value of H are X-axis (horizontal deflection). In this example, the digital values are processed by the A / D converters 11a and 11e, but the analog values can be displayed on the display 12 as they are. Therefore, when the security paper 1 is checked for authenticity by the authenticity determination device Ab, a BH diagram showing magnetic history characteristics having a pattern peculiar to a ferromagnetic substance is output and displayed on the display device 12, and Recognized Fig. 1 (a), (b),
The true / false judgment can be easily made by visually visually comparing each type pattern of the true magnetic material such as (c). That is, if both patterns are matched by comparison, the security paper 1 is determined to be counterfeit if the two patterns are confirmed to be authentic.

【0015】[0015]

【発明の効果】以上詳細に説明したように、証券類等の
用紙に安全保護紙として埋め込んだ強磁性体あるいは樹
脂基板にコーティングされた強磁性体からなる安全線条
を励磁磁界の強度変化による履歴曲線の変化として検出
し、表示して目視によるか、又は周波数分析することで
強磁性体のもつ固有の磁気特性を正確に判定することが
できる。そのため一般には容易に製作できない特有の履
歴曲線をもった強磁性体を使用すれば、偽造が困難であ
り、また偽造品の検出が容易なためその効果は高い。
As described in detail above, a safety wire made of a ferromagnetic material embedded in a paper such as securities as a safety protection paper or a ferromagnetic material coated on a resin substrate is provided by changing the intensity of the exciting magnetic field. It is possible to accurately determine the inherent magnetic characteristics of the ferromagnetic material by detecting it as a change in the history curve, displaying it and visually displaying it, or by performing frequency analysis. Therefore, in general, if a ferromagnetic material having a unique hysteresis curve that cannot be easily manufactured is used, counterfeiting is difficult, and a counterfeit product is easily detected, so that the effect is high.

【図面の簡単な説明】[Brief description of drawings]

【図1】強磁性体に外部から磁界を加えたときの磁束密
度グラフである。
FIG. 1 is a magnetic flux density graph when a magnetic field is externally applied to a ferromagnetic material.

【図2】強磁性体を安全線条として埋め込んだ安全保護
紙の例を示す斜視図である。
FIG. 2 is a perspective view showing an example of a safety protection paper in which a ferromagnetic material is embedded as a safety line.

【図3】強磁性体の磁気特性から種別を判別するための
本発明の第一の実施例を示す装置例である。
FIG. 3 is an example of an apparatus showing a first embodiment of the present invention for discriminating the type from the magnetic characteristics of a ferromagnetic material.

【図4】本発明の第一の実施例の判定装置に用いられる
周波数分析器の構成例を示すブロック図である。
FIG. 4 is a block diagram showing a configuration example of a frequency analyzer used in the determination device according to the first embodiment of the present invention.

【図5】強磁性体のサンプルを図3の判定装置において
分析した結果を示す図である。
5 is a diagram showing a result of analyzing a ferromagnetic sample by the determination device of FIG. 3. FIG.

【図6】強磁性体の他のサンプルを図4の判定装置にお
いて分析した結果を示す図である。
FIG. 6 is a diagram showing a result of analyzing another sample of a ferromagnetic material by the determination device of FIG. 4.

【図7】本発明に用いる判定回路が行う判定手順を示す
フローチャートである。
FIG. 7 is a flowchart showing a determination procedure performed by a determination circuit used in the present invention.

【図8】強磁性体の磁気特性から種別を判別するための
本発明の他の実施例を示す装置例である。
FIG. 8 is an example of an apparatus showing another embodiment of the present invention for discriminating the type from the magnetic characteristic of a ferromagnetic material.

【図9】本発明の第二の実施例の真偽判定装置に用いら
れるB−H図発生器の構成例を示すブロック図である。
FIG. 9 is a block diagram showing a configuration example of a BH diagram generator used in the authenticity determination device of the second exemplary embodiment of the present invention.

【符号の説明】[Explanation of symbols]

Aa,Ab 真偽判定装置 1 安全保護紙 2 安全線条 3 交流励磁電源 4 励磁電流制御用抵抗 5 励磁電流制御スイッチ 6 励磁コイル 7 磁気ヘッド 8 増幅器 9 周波数分析器 9a ロ−パスフィルタ 9b A/D変換器 9c メモリ(1) 9d FET演算器 9e メモリ(2) 10 判定回路 11 B−H図発生器 11a,11e A/D変換器 11b,11f 積分演算器 11c メモリ(1) 11d,11h D/A変換器 11g メモリ(2) 12 表示器 Aa, Ab True / False Judgment Device 1 Safety Paper 2 Safety Wire 3 AC Excitation Power Supply 4 Excitation Current Control Resistor 5 Excitation Current Control Switch 6 Excitation Coil 7 Magnetic Head 8 Amplifier 9 Frequency Analyzer 9a Low Pass Filter 9b A / D converter 9c Memory (1) 9d FET calculator 9e Memory (2) 10 Judgment circuit 11 BH diagram generator 11a, 11e A / D converter 11b, 11f Integral calculator 11c Memory (1) 11d, 11h D / A converter 11g Memory (2) 12 Display

───────────────────────────────────────────────────── フロントページの続き (72)発明者 水上 一郎 東京都杉並区久我山一丁目7番41号 岩崎 通信機株 式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ichiro Mizukami 1-741 Kugayama, Suginami-ku, Tokyo Iwasaki Tsushinki Co., Ltd.

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 磁界の強さの変化幅が複数段階に変化す
る励磁磁界に対し特異な磁気履歴特性の変化を示す強磁
性体材料からなる安全線条が用紙内に埋め込まれている
安全保護紙。
1. A safety protection in which a safety wire made of a ferromagnetic material, which exhibits a unique change in magnetic hysteresis characteristic with respect to an exciting magnetic field in which a change width of a magnetic field strength changes in a plurality of steps, is embedded in a sheet. paper.
【請求項2】 磁界の強さの変化幅が複数段階に変化す
る励磁磁界に対し特異な磁気履歴特性の変化を示す強磁
性体材料からなる安全線条が用紙内に埋め込まれている
安全保護紙を取扱い対象として、 前記強磁性体材料からなる安全線条を励磁するための励
磁磁界をその変化幅を複数段階に変化させて発生させる
機能を有する励磁手段と、 励磁された前記安全線条から数段階に変化させた前記励
磁磁界による磁束密度変化を検出して該安全線条を形成
する前記強磁界体材料の磁気履歴特性を表示する磁気特
性表示手段とを備え、 該表示された磁気履歴特性が真正の安全線条に対応して
予め求められた固有の磁気履歴特性と適正に一致するか
否かにより,前記安全保護紙が真正であるか又は偽造で
あると判定し得るように構成された安全保護紙の真偽判
定装置。
2. A safety protection in which a safety wire made of a ferromagnetic material, which exhibits a unique change in magnetic hysteresis characteristic with respect to an exciting magnetic field in which a change width of magnetic field strength changes in a plurality of steps, is embedded in a sheet. Exciting means having a function of generating an exciting magnetic field for exciting the safety wire made of the ferromagnetic material by changing the change width in a plurality of steps for handling paper, and the excited safety wire. A magnetic characteristic display means for displaying a magnetic history characteristic of the strong magnetic field material forming the safety line by detecting a change in magnetic flux density due to the exciting magnetic field which is changed in several steps. According to whether or not the history characteristic properly matches the inherent magnetic history characteristic previously obtained corresponding to the authentic safety line, it is possible to determine that the safety protection paper is authentic or counterfeit. Structured security paper Authenticity determination device.
【請求項3】 磁界の強さの変化幅が複数段階に変化す
る励磁磁界に対し特異な磁気履歴特性の変化を示す強磁
性体材料からなる安全線条が用紙内に埋め込まれている
安全保護紙を取扱い対象として、 前記強磁性体材料からなる安全線条を励磁するための励
磁磁界をその変化幅を複数段階に変化させて発生させる
機能を有する励磁手段と、 励磁された前記安全線条から前記励磁磁界による磁束密
度変化を検出する磁束検知手段と、 前記複数段階に変化させた励磁磁界の各磁界強度変化幅
に対応する前記磁束密度変化に含まれる周波数スペクト
ラム強度を求める周波数分析手段と、 求められた該周波数スペクトラム強度が真正の安全線条
に対応して予め定められた固有の周波数スペクトラム強
度と適正に一致するか否かにより、前記安全保護紙が真
正であるか又は偽造であると判定する判定手段とを備え
た安全保護紙の真偽判定装置。
3. A safety protection in which a safety wire made of a ferromagnetic material, which exhibits a unique change in magnetic hysteresis characteristics with respect to an exciting magnetic field in which a change width of a magnetic field strength changes in a plurality of steps, is embedded in a sheet. Exciting means having a function of generating an exciting magnetic field for exciting the safety wire made of the ferromagnetic material by changing the change width in a plurality of steps for handling paper, and the excited safety wire. Magnetic flux detecting means for detecting a change in magnetic flux density due to the exciting magnetic field, and frequency analyzing means for obtaining a frequency spectrum strength included in the magnetic flux density change corresponding to each magnetic field strength change width of the exciting magnetic field changed in a plurality of steps, , The safety protection depends on whether or not the obtained frequency spectrum intensity properly matches the predetermined frequency spectrum intensity corresponding to the authentic safety line. Authenticity determination apparatus of security paper that includes a is a determination means or is counterfeit is authentic.
JP01834395A 1995-01-11 1995-01-11 Safety protection paper and its authenticity judgment device Expired - Lifetime JP3271865B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP01834395A JP3271865B2 (en) 1995-01-11 1995-01-11 Safety protection paper and its authenticity judgment device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP01834395A JP3271865B2 (en) 1995-01-11 1995-01-11 Safety protection paper and its authenticity judgment device

Publications (2)

Publication Number Publication Date
JPH08199498A true JPH08199498A (en) 1996-08-06
JP3271865B2 JP3271865B2 (en) 2002-04-08

Family

ID=11969018

Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Link
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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001315477A (en) * 2000-05-12 2001-11-13 Dainippon Printing Co Ltd Forgery preventive heat sensitive paper and ticket paper using the same
JP2005146477A (en) * 2003-11-18 2005-06-09 Fuji Xerox Co Ltd Security paper, method and apparatus for producing the same
WO2005088860A1 (en) * 2004-03-10 2005-09-22 Toyo Boseki Kabushiki Kaisha Commodity inspection system and method, commodity which can be inspected, and illegal sale prevention aid system
JP2006060025A (en) * 2004-08-20 2006-03-02 National Printing Bureau Falsification prevention structure of amorphous magnetic thin film and method of authenticity judgment of falsification prevention structure
US7173416B2 (en) 2002-03-04 2007-02-06 Sicpa Holding S.A. Measurement probe and authentication device comprising the same
US7726796B2 (en) * 2005-03-17 2010-06-01 Fuji Xerox Co., Ltd. Magnetic wire application apparatus, method thereof and printed material including magnetic wire

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001315477A (en) * 2000-05-12 2001-11-13 Dainippon Printing Co Ltd Forgery preventive heat sensitive paper and ticket paper using the same
JP4522537B2 (en) * 2000-05-12 2010-08-11 大日本印刷株式会社 Anti-counterfeit thermal paper and ticket using it
US7173416B2 (en) 2002-03-04 2007-02-06 Sicpa Holding S.A. Measurement probe and authentication device comprising the same
JP2005146477A (en) * 2003-11-18 2005-06-09 Fuji Xerox Co Ltd Security paper, method and apparatus for producing the same
WO2005088860A1 (en) * 2004-03-10 2005-09-22 Toyo Boseki Kabushiki Kaisha Commodity inspection system and method, commodity which can be inspected, and illegal sale prevention aid system
JP2006060025A (en) * 2004-08-20 2006-03-02 National Printing Bureau Falsification prevention structure of amorphous magnetic thin film and method of authenticity judgment of falsification prevention structure
US7726796B2 (en) * 2005-03-17 2010-06-01 Fuji Xerox Co., Ltd. Magnetic wire application apparatus, method thereof and printed material including magnetic wire

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