JPH11296804A - Recording and reproducing method of magnetic card and the card used in the method - Google Patents
Recording and reproducing method of magnetic card and the card used in the methodInfo
- Publication number
- JPH11296804A JPH11296804A JP10097074A JP9707498A JPH11296804A JP H11296804 A JPH11296804 A JP H11296804A JP 10097074 A JP10097074 A JP 10097074A JP 9707498 A JP9707498 A JP 9707498A JP H11296804 A JPH11296804 A JP H11296804A
- Authority
- JP
- Japan
- Prior art keywords
- recording
- magnetic
- information
- reproducing method
- card
- 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.)
- Withdrawn
Links
Landscapes
- Magnetic Record Carriers (AREA)
- Digital Magnetic Recording (AREA)
- Hard Magnetic Materials (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は，磁気カードの記録
再生方法（システム）およびそれに用いられる磁気カー
ドに関し，特に，セキュリティに優れた磁気カードの記
録再生方法およびこの磁気カード記録再生方法に用いら
れる磁気カードに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic card recording / reproducing method (system) and a magnetic card used therefor, and more particularly to a magnetic card recording / reproducing method with excellent security and a magnetic card recording / reproducing method. It relates to a magnetic card.
【０００２】[0002]
【従来の技術】乗車券，テレホンカード，プリペイドカ
ードなどの金券として利用されている磁気カード類は，
カードを利用する毎に所定の装置で，カードに設けられ
た磁気記録層に残金等の所定の情報を書き換えることに
より使用されている。これらのカードには，偽造防止の
策として，磁気記録層に保護層を設ける，あるいは磁気
記録層を多層にする，または使用毎にカードにパンチ穴
を開ける等の工夫が施されている。2. Description of the Related Art Magnetic cards used as tickets, telephone cards, prepaid cards, etc., are:
Each time a card is used, it is used by rewriting predetermined information such as a balance on a magnetic recording layer provided on the card by a predetermined device. In order to prevent forgery, these cards are provided with a protective layer on the magnetic recording layer, a multilayered magnetic recording layer, or a punched hole in the card each time the card is used.
【０００３】ところが，磁気カードの普及と共に，磁気
カードの情報を再生，記録する装置技術も発達し，磁気
カードに記録した情報を容易に読み取り，さらには情報
を書き込むことまで可能となった。具体的には，磁気記
録カードの使用毎に，新しい情報を含む全情報が，旧情
報の上にオーバーライトされる形で書き換えられるた
め，カードの情報を記録，再生する装置があれば，容易
に情報の書換えが行え，これにより，カードの偽造が容
易に行えることになり，近年磁気カードの偽造が目だっ
て増えてきた。However, with the spread of magnetic cards, device technology for reproducing and recording information on magnetic cards has also been developed, and information recorded on magnetic cards can be easily read, and even information can be written. Specifically, every time a magnetic recording card is used, all information, including new information, is rewritten so that it is overwritten on old information. Information can be easily rewritten, which makes it easy to forge a card. In recent years, forgery of a magnetic card has been remarkably increased.
【０００４】この原因として，磁性層の保磁力が２〜３
ｋＯｅと低いことにあると考えられる。つまり，保磁力
が低いと従来の磁気記録，再生装置で容易に情報の書換
えができ，カードの偽造が可能となる。The cause is that the coercive force of the magnetic layer is 2-3.
It is considered to be low kOe. That is, if the coercive force is low, information can be easily rewritten by a conventional magnetic recording / reproducing apparatus, and the card can be forged.
【０００５】そこで，本発明者らは，上記問題点を鑑み
調査を進めた結果，優れたセキュリティ効果を有する磁
気記録方式および磁気カードとその製造方法を提案して
いる（特願平６−１４３６９５号，特願平６−２１６０
３９号，特願平６−２９６７９５号，特願平６−２９７
２２８号，特願平６−３２００９１号，特願平６−３２
７２５５号，特願平７−３１２８４９，特願平８−１８
６３８４号，特願平８−１８６４０７号，特願平８−１
８７８６４号，特願平８−１８７８６５号，及び特願平
８−２０９２４１号）。これら磁気記録カードに関する
発明は，磁気記録が容易であり，かつ保磁力が高い磁気
記緑材料を用いており，これにより情報の記録は容易に
行えるが，記録した情報の消去，書き換えが困難となる
ため，従来のような偽造を目的とした情報消去，書き込
みが不可能である磁気カードを得るものである。In view of the above problems, the present inventors have conducted investigations and have proposed a magnetic recording system and a magnetic card having an excellent security effect and a method of manufacturing the same (Japanese Patent Application No. 6-143695). No., Japanese Patent Application No. 6-2160
39, Japanese Patent Application No. 6-296975, Japanese Patent Application No. 6-297
No. 228, Japanese Patent Application No. 6-320091, Japanese Patent Application No. 6-32
No. 7255, Japanese Patent Application No. 7-312849, Japanese Patent Application No. 8-18.
No. 6384, Japanese Patent Application No. 8-186407, Japanese Patent Application No. 8-1
87864, Japanese Patent Application No. 8-187865, and Japanese Patent Application No. 8-209241). The inventions related to these magnetic recording cards use a magnetic recording material that is easy to magnetically record and has a high coercive force, so that information can be recorded easily, but it is difficult to erase and rewrite the recorded information. Therefore, it is possible to obtain a magnetic card that cannot erase and write information for the purpose of forgery as in the related art.
【０００６】また，これらの従来の発明における高保磁
力でかつ着磁性の良好な磁性層としては，一般式Ｒx Ｔ
100-x-y Ｍy （但し，ＲはＳｍを必須成分とするＹを含
む希土類元素から選択された少なくとも１種，Ｔは，Ｃ
ｏを主成分とする遷移金属Ｆｅ，Ｃｏ，Ｎｉの内から選
択された少なくとも１種，Ｍは，Ｓｉ，Ｔｉ，Ａｌ，Ｇ
ａ，Ｖ，Ｃｒ，Ｍｎ，Ｃｕ，Ｚｒ，Ｎｂ，Ｍｏ，Ｐｄ，
Ｈｆ，Ｔａ，Ｗ，Ｐｔ，およびＡｕの内の少なくとも１
種の元素で表され，Ｒの組成値ｘは１６．０〜２２．０
ａｔ％，Ｍの組成値ｙは０〜３０．０ａｔ％である。）
で示される合金粉末が適当である。The magnetic layer having a high coercive force and good magnetizability in these conventional inventions is represented by a general formula R x T
100-xy M y (provided that at least one R is selected from rare earth elements including Y, as an essential component Sm, T is, C
at least one selected from transition metals Fe, Co, and Ni mainly containing o, M is Si, Ti, Al, G
a, V, Cr, Mn, Cu, Zr, Nb, Mo, Pd,
At least one of Hf, Ta, W, Pt, and Au
The composition value x of R is 16.0 to 22.0.
The composition value y of at% and M is 0 to 30.0 at%. )
Is suitable.
【０００７】上記の高保磁力カードを用いたカードシス
テムを運用する場合，同じ磁気情報を記録した低保磁力
カードを使用した場合，磁気情報を読みとる際に，低保
磁力上の磁気記録は消去でき，高保磁力カード上の記録
は消去されない適当な電流で消磁処理を行い，カードを
判別する方式が考えられる。When operating a card system using the above-described high coercive force card, when using a low coercive force card on which the same magnetic information is recorded, when reading magnetic information, the magnetic recording on the low coercive force can be erased. A method is considered in which the recording on the high coercive force card is demagnetized with an appropriate current that is not erased, and the card is identified.
【０００８】[0008]
【発明が解決しようとする課題】この方式は，高保磁力
カード上の信号強度を減衰させる適当な電流を印加し
て，印加前後の出力差からカードの正当性を判別する方
法であったが，この場合，処理前後の出力差が十分に得
られない場合がある欠点が合った。In this method, a proper current for attenuating the signal strength on a high coercive force card is applied, and the validity of the card is determined from the output difference between before and after the application. In this case, the disadvantage that the output difference before and after the processing may not be sufficiently obtained was met.
【０００９】そこで，本発明の技術的課題は，より高い
セキュリティの磁気カードと磁気記録再生方法とを提供
することにある。[0009] Therefore, it is an object of the present invention to provide a magnetic card and a magnetic recording / reproducing method with higher security.
【００１０】[0010]
【課題を解決するための手段】本発明者らは，これらの
問題の検討を進めた結果，２種類以上の異なる記録密度
（１種以上の記録波形）で記録した場合，２種類以上の
記録再生出力を得られることを発見し，本発明をなすに
至ったものである。Means for Solving the Problems As a result of studying these problems, the present inventors have found that when recording is performed at two or more different recording densities (one or more recording waveforms), two or more recording densities are obtained. The inventors have found that a reproduction output can be obtained, and have accomplished the present invention.
【００１１】即ち，本発明によれば，非磁性基体上の少
なくとも一部に磁気記録層を有し，前記磁気記録層に対
して磁気ヘッドを用いて情報を記録又は再生する磁気カ
ードの記録再生方法において，前記磁性層の磁気記録領
域に，記録電流の波形の立ち上がり時間，及び立ち下が
り（減衰）時間の内の少なくとも一方が，前記記録電流
の波形の半周期の４０〜１００％である波形を有する前
記記録電流で記録することを特徴とする磁気カードの記
録再生方法が得られる。That is, according to the present invention, a recording / reproduction of a magnetic card which has a magnetic recording layer on at least a part of a non-magnetic substrate and records or reproduces information on the magnetic recording layer using a magnetic head. In the method, a waveform in which at least one of a rise time and a fall (decay) time of a recording current waveform is 40 to 100% of a half cycle of the recording current waveform in the magnetic recording region of the magnetic layer. A recording / reproducing method for a magnetic card, characterized in that recording is performed with the recording current having the following.
【００１２】また，本発明によれば，非磁性基体上の少
なくとも一部に磁気記録層を有し，前記磁気記録層に対
して磁気ヘッドを用いて情報を記録又は再生する磁気カ
ードの記録再生方法において，前記磁性層の磁気記録領
域に，前記記録電流の波形の立ち上がり時間及び立ち下
がり（減衰）時間の内の少なくとも一方が，前記記録電
流の波形の半周期の４０％以下であり，且つ前記記録電
流の波形の極大をなす部分の変化時間が当該記録電流の
波形の１周期の８０％以下である波形を有する前記記録
電流で記録することを特徴とする磁気カードの記録再生
方法が得られる。According to the present invention, there is also provided a magnetic card having a magnetic recording layer on at least a part of a non-magnetic substrate and recording or reproducing information on or from the magnetic recording layer using a magnetic head. In the method, in the magnetic recording region of the magnetic layer, at least one of a rise time and a fall (decay) time of the waveform of the recording current is 40% or less of a half cycle of the waveform of the recording current, and A recording / reproducing method for a magnetic card is characterized in that recording is performed with the recording current having a waveform in which a change time of a portion forming a maximum of the recording current waveform is 80% or less of one cycle of the recording current waveform. Can be
【００１３】また，本発明によれば，任意時間におい
て，前記した一つの磁気カードの記録再生方法を用いる
部分と前記したもう一つの磁気カードの記録再生方法を
用いる部分とを備えていることを特徴とする磁気カード
の記録再生方法が得られる。According to the present invention, there is provided, at an arbitrary time, a portion using the recording / reproducing method for one magnetic card and a portion using the recording / reproducing method for another magnetic card. A characteristic recording / reproducing method for a magnetic card is obtained.
【００１４】また，本発明によれば，前記磁気カードの
記録再生方法おいて，磁気情報が記録されている部分の
磁気情報を読み込んだ際，記録波形または，かつ，記録
密度を変化させ記録した２種類以上の再生出力差を検出
し，磁気情報に付加することを特徴とする磁気カードの
記録再生方法が得られる。According to the present invention, in the magnetic card recording / reproducing method, when reading magnetic information of a portion where magnetic information is recorded, recording is performed by changing a recording waveform or a recording density. A recording / reproducing method for a magnetic card is characterized in that two or more types of reproduction output differences are detected and added to magnetic information.
【００１５】また，本発明によれば，前記磁気カードの
記録再生方法において，磁気情報が記録されている部分
に一方向磁界を印加処理し，磁気情報を読み込んだ際，
印加処理後の磁気情報の再生出力差を検出することを特
徴とした磁気カードの記録再生方法が得られる。According to the present invention, in the recording / reproducing method for a magnetic card, when a one-way magnetic field is applied to a portion where magnetic information is recorded and the magnetic information is read,
A magnetic card recording / reproducing method is characterized in that a reproduction output difference of magnetic information after the application processing is detected.
【００１６】また，本発明によれば，前記磁気カードの
記録再生方法において，磁気情報が記録されている部分
に一方向磁界を印加処理をすることにより，磁気情報を
読み込んだ際，処理前後の記録情報再生出力差を検知す
ることを特徴とする磁気カードの記録再生方法が得られ
る。According to the present invention, in the magnetic card recording / reproducing method, a unidirectional magnetic field is applied to a portion where magnetic information is recorded, so that when magnetic information is read, the magnetic information is read before and after the process. A magnetic card recording / reproducing method characterized by detecting a recording information reproduction output difference is obtained.
【００１７】また，本発明によれば，前記いずれかの磁
気カードの記録再生方法において，少なくとも１種類以
上の方式を組み合わせ，磁気情報に付加することを特徴
とする磁気カードの記録再生方法が得られる。Further, according to the present invention, there is provided a magnetic card recording / reproducing method characterized in that at least one or more types are combined and added to magnetic information in any of the magnetic card recording / reproducing methods. Can be
【００１８】また，本発明によれば，前記磁気カードの
記録再生方法において，２種類以上の記録密度で記録す
ることを特徴とする磁気カードの記録再生方法が得られ
る。Further, according to the present invention, there is provided a magnetic card recording / reproducing method in which recording is performed at two or more types of recording densities in the magnetic card recording / reproducing method.
【００１９】また，本発明によれば，前記磁気カードの
記録再生方法おいて，磁気情報が記録されている部分の
磁気情報を読み込んだ際，記録波形または，かつ，記録
密度を変化させ記録した２種類以上の再生出力差を検出
し，磁気情報に付加することを特徴とする磁気カードの
記録再生方法が得られる。According to the present invention, in the recording / reproducing method for a magnetic card, when the magnetic information of the portion where the magnetic information is recorded is read, the recording is performed by changing the recording waveform or the recording density. A recording / reproducing method for a magnetic card is characterized in that two or more types of reproduction output differences are detected and added to magnetic information.
【００２０】また，本発明によれば，前記磁気カードの
記録再生方法において，磁気情報が記録されている部分
に一方向磁界を印加処理し，磁気情報を読み込んだ際，
印加処理後の磁気情報の再生出力差を検出することを特
徴とする磁気カードの記録再生方法が得られる。According to the present invention, in the recording / reproducing method for a magnetic card, when a one-way magnetic field is applied to a portion where magnetic information is recorded and the magnetic information is read,
A magnetic card recording / reproducing method is characterized in that a reproduction output difference of magnetic information after the application processing is detected.
【００２１】また，本発明によれば，前記磁気カードの
記録再生方法において，磁気情報が記録されている部分
に一方向磁界を印加処理をすることにより，磁気情報を
読み込んだ際，処理前後の記録情報再生出力差を検知す
ることを特徴とする磁気カードの記録再生方法が得られ
る。According to the present invention, in the magnetic card recording / reproducing method, a one-way magnetic field is applied to a portion where the magnetic information is recorded, so that when the magnetic information is read, the magnetic information is read before and after the process. A magnetic card recording / reproducing method characterized by detecting a recording information reproduction output difference is obtained.
【００２２】また，本発明によれば，前記いずれかの磁
気カードの記録再生方法において，少なくとも１種類以
上の方式を組み合わせ，磁気情報に付加することを特徴
とする磁気カードの記録再生方法が得られる。According to the present invention, there is provided a magnetic card recording / reproducing method in which at least one or more types are combined and added to magnetic information in any of the magnetic card recording / reproducing methods. Can be
【００２３】また，本発明によれば，前記いずれかの磁
気カードの記録再生方法において磁気記録層の一部，あ
るいは全ての情報が消去不可能又は困難であることを特
徴とする磁気カードの記録再生方法が得られる。According to the present invention, in any one of the above-described methods for recording / reproducing a magnetic card, information on a part or all of the magnetic recording layer is erasable or difficult. A reproduction method is obtained.
【００２４】また，本発明によれば，前記いずれかの磁
気カードの記録再生方法において，保磁力が４ｋＯｅ以
上である磁性粉を使用していることを特徴とする磁気カ
ードの記録再生方法が得られる。According to the present invention, there is provided a magnetic card recording / reproducing method characterized in that in any one of the above-mentioned magnetic card recording / reproducing methods, magnetic powder having a coercive force of 4 kOe or more is used. Can be
【００２５】また，本発明によれば，前記いずれかの磁
気カードの記録再生方法において，当該磁気カードの磁
気記録層には，一般式Ｒx Ｔ100-x-y Ｍy （但し，Ｒは
Ｓｍを必須成分とするＹを含む希土類元素から選択され
た少なくとも１種，Ｔは，Ｃｏを主成分とする遷移金属
Ｆｅ，Ｃｏ，Ｎｉの内から選択された少なくとも１種，
Ｍは，Ｓｉ，Ｔｉ，Ａ１，Ｇａ，Ｖ，Ｃｒ，Ｍｎ，Ｃ
ｕ，Ｚｒ，Ｎｂ，Ｍｏ，Ｐｄ，Ｈｆ，Ｔａ，Ｗ，Ｐｔ，
およびＡｕの内の少なくとも１種の元素で表され，Ｒの
組成値ｘは１６．０〜２２．０ａｔ％，Ｍの組成値ｙは
０，３０．０ａｔ％である。）で示される合金粉末を使
用していることを特徴とする磁気カードの記録再生方法
が得られる。Further, according to the present invention, a recording and reproducing method of any one of the above magnetic card, the magnetic recording layer of the magnetic card, the general formula R x T 100-xy M y ( where, R represents a Sm T is at least one element selected from rare earth elements containing Y as an essential component, and T is at least one element selected from transition metals Fe, Co, and Ni containing Co as a main component.
M is Si, Ti, A1, Ga, V, Cr, Mn, C
u, Zr, Nb, Mo, Pd, Hf, Ta, W, Pt,
And Au are represented by at least one element. The composition value x of R is 16.0 to 22.0 at%, and the composition value y of M is 0.30.0 at%. A recording / reproducing method for a magnetic card, characterized by using the alloy powder shown in (1).
【００２６】さらに，本発明によれば，前記いずれかの
磁気カードの記録再生方法に用いられることを特徴とす
る磁気カードが得られる。Further, according to the present invention, there is provided a magnetic card which is used for any of the above magnetic card recording / reproducing methods.
【００２７】[0027]
【発明の実施の形態】以下，本発明の実施の形態による
磁気カードの記録再生方法およびこの磁気カードの記録
再生方法に用いられた磁気カードについて図面を参照し
て説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS A magnetic card recording / reproducing method according to an embodiment of the present invention and a magnetic card used in the magnetic card recording / reproducing method will be described below with reference to the drawings.
【００２８】まず，本発明者が見い出した本発明の特徴
を詳細に述べる。保磁力の高い（ＨｃJ ≧４ｋＯｅ）磁
性粉を磁性層とする磁気カードの場合，磁気情報を記録
する際，記録減磁などの問題が生じ，磁気情報の記録が
困難になる傾向にあるが，更に高記録密度や記録波形が
パルス波形で記録する際にも，記録減磁，自己減磁等の
影響により記録が困難になる傾向がある。そこでこれら
の問題の検討を進めた結果，磁気カードに記録情報を記
録する際，記録電流波形の時間及び周期がコントロール
されながら記録される結果，２種類のトラックを持つ磁
気記録領域になる。その後，一方向磁界を印加処理し，
処理前後の磁気情報の再生出力差が検知される。First, the features of the present invention found by the present inventors will be described in detail. In the case of a magnetic card using a magnetic layer having a high coercive force (Hc J ≧ 4 kOe) as a magnetic layer, when recording magnetic information, problems such as recording demagnetization occur, and it tends to be difficult to record magnetic information. In addition, even when recording is performed with a high recording density or a pulse waveform, the recording tends to be difficult due to the effects of recording demagnetization, self-demagnetization, and the like. Therefore, as a result of studying these problems, when recording information is recorded on a magnetic card, recording is performed while controlling the time and cycle of a recording current waveform, resulting in a magnetic recording area having two types of tracks. Then, apply a unidirectional magnetic field,
A difference between the reproduction output of the magnetic information before and after the processing is detected.
【００２９】具体的には，２種類以上の異なる記録密度
（１種類以上の記録波形）で記録する手段を用いてい
る。すなわち，情報記録領域は，初期情報としての情報
を２種類以上の記録密度で長手方向に磁気的に記録する
ための一方の手段による情報記録領域と他方の手段によ
る情報記録領域を備えている。これにより，２種類以上
の記録再生出力を得られることを発見した。More specifically, means for recording at two or more different recording densities (one or more recording waveforms) is used. That is, the information recording area includes an information recording area by one means and an information recording area by the other means for magnetically recording information as initial information at two or more types of recording densities in the longitudinal direction. As a result, it has been found that two or more types of recording / reproducing outputs can be obtained.
【００３０】また，２種類以上の異なる記録波形（１種
類以上の記録密度）でこれら情報記録領域をそれぞれ記
録した場合においても，２種類以上の記録再生出力を得
られることを発見した。そこで特願平９−２５０２８号
と組み合わせることによりさらに高いセキュリティを得
ることが出来る。It has also been found that, even when these information recording areas are recorded with two or more types of different recording waveforms (one or more types of recording densities), two or more types of recording / reproducing outputs can be obtained. Therefore, higher security can be obtained by combining with Japanese Patent Application No. 9-25028.
【００３１】よって，本発明によれば，磁気カードに記
録情報を記録するときの記録電流波形をコントロール
し，２種類以上の記録密度で記録（１種類以上の記録波
形），または，２種類以上の記録波形で記録（１種類以
上の記録密度）後，記録密度または，情報記録時の記
録波形の違いによる磁気情報の再生出力差を検知するこ
と，一方向磁界を印加処理後，さらに，処理後の記録
密度または，情報記録時の記録波形の違いによる磁気情
報の再生出力差を検知すること，処理前後の磁気情報
の再生出力差を検知することの項目を少なくとも１種類
以上組み合わせることにより高セキュリティ（特に，カ
ードおよび情報の真贋判定に効果大）の磁気カード，お
よび磁気記録再生方法を得ることができる。Therefore, according to the present invention, the recording current waveform when recording information is recorded on the magnetic card is controlled, and recording is performed at two or more recording densities (one or more recording waveforms) or two or more recording densities. After recording with one recording waveform (one or more types of recording densities), detecting the difference between the recording density and the reproduction output of magnetic information due to the difference in the recording waveform when recording information, applying a unidirectional magnetic field, and further processing By combining at least one or more of the following items: detecting a difference in reproduction output of magnetic information due to a difference in recording density or a recording waveform at the time of recording information, and detecting a difference in reproduction output of magnetic information before and after processing. It is possible to obtain a magnetic card and a magnetic recording / reproducing method for security (in particular, the effect of determining the authenticity of a card and information is high).
【００３２】以下に詳細な説明をする。The details will be described below.
【００３３】基体の一部あるいは全面に磁気記録層を有
した磁気カードに，磁気ヘッドを用いて所定の情報を記
録するときに，記録電流波形のピークからピークへの変
化時間が記録電流の１周期の８０％以下，かつ，立ち上
がり，または，かつ，立ち下がり（減衰）時間が記録電
流の半周期の４０％以下である記録電流で２種類以上の
記録密度（１種類以上の記録波形）または，２種類以上
の記録波形（１種類以上の記録密度）で記録した磁気カ
ードである。この記録を行った磁気カードは２種類以上
の記録密度（１種類以上の記録波形）または，２種類以
上の記録波形（１種類以上の記録密度）で記録している
ため，それに対応した２種類以上の再生出力を得ること
が出来，この再生出力差を検知する。この記録を行った
磁気カードに，一方向磁界（消磁磁界）の印加処理を施
すと，磁気カードに記録された磁気記録の再生出力は変
化する（記録後と比較し，減少あるいは増加）。そし
て，この処理後，記録密度または，記録波形の変化に対
応する磁気情報の再生出力差を検知する（処理前の再生
出力差と同等である必要はない。さらに，この印加処理
前後の再生出力差を検知する磁気記録再生方法である。
また，磁気カードに用いられる磁性粉の保磁力は４ｋＯ
ｅ以上である（保磁力が４ｋＯｅ以下の場合，消去処理
により再生出力は検出されない）。When predetermined information is recorded on a magnetic card having a magnetic recording layer on a part or the entire surface of a base by using a magnetic head, the change time from the peak of the recording current waveform to the peak is one time of the recording current. Two or more types of recording densities (one or more types of recording waveforms) with a recording current of 80% or less of the cycle and a rise (or fall) time of 40% or less of a half cycle of the recording current or , Magnetic cards recorded with two or more types of recording waveforms (one or more types of recording densities). Since the magnetic card on which this recording is performed is recorded with two or more types of recording densities (one or more types of recording waveforms) or two or more types of recording waveforms (one or more types of recording densities), two types of recordings corresponding to the two types of recording densities are used. The above reproduction output can be obtained, and this reproduction output difference is detected. When a one-way magnetic field (demagnetizing magnetic field) is applied to the magnetic card on which the recording has been performed, the reproduction output of the magnetic recording recorded on the magnetic card changes (decreases or increases compared to that after recording). After this processing, the reproduction output difference of the magnetic information corresponding to the change in the recording density or the recording waveform is detected (there is no need to be equal to the reproduction output difference before the processing. This is a magnetic recording / reproducing method for detecting a difference.
The coercive force of the magnetic powder used for the magnetic card is 4 kO.
e (when the coercive force is 4 kOe or less, no reproduced output is detected by the erasing process).
【００３４】即ち，本発明は，媒体の記録減磁を積極的
に利用し，消去処理を行うことにより出力が増加する現
象を記録再生方法に取り入れたものである。さらに，記
録減磁の影響の少ない記録密度，記録波形の場合は，消
去処理を行うことにより出力は減少する。この出力の低
下率も記録密度，記録波形によって異なる。この様に，
記録密度，記録波形により出力が増減率が変化する媒体
は，他には無いため，他の媒体での記録密度，記録波形
の組み合わせにより偽造，変造は不可能であり，磁気カ
ードおよび情報の真贋判定が容易であり，高いセキュリ
ティが得られる。 以下，本発明の実施の形態による磁
気カードの記録再生方法についての具体例を挙げて説明
する。That is, the present invention incorporates into the recording / reproducing method a phenomenon in which the output is increased by performing the erasing process by positively utilizing the recording demagnetization of the medium. Further, in the case of a recording density and a recording waveform which are less affected by the recording demagnetization, the output is reduced by performing the erasing process. The rate of decrease in the output also depends on the recording density and the recording waveform. Like this
There is no other medium whose output changes depending on the recording density and recording waveform. Therefore, forgery and falsification are impossible due to the combination of the recording density and recording waveform on other media, and the authenticity of the magnetic card and information is not possible. Judgment is easy and high security is obtained. Hereinafter, a specific example of a recording / reproducing method of a magnetic card according to an embodiment of the present invention will be described.
【００３５】（例１）１０ｋＯｅ磁場印加後の保磁力が
１４ｋＯｅのＳｍ−Ｃｏ−Ａｌ合金粉末を用い，ポリウ
レタン樹脂，塩化ビニル−酢酸ビニル共重合樹脂および
溶剤に分散させ磁性塗料を作製した。作製した磁性塗料
を，ＰＥＴ（ポリエチレンテレフタレート）の基体上に
塗布して，磁性層を形成した磁気カードを得た。Example 1 Using an Sm-Co-Al alloy powder having a coercive force of 14 kOe after applying a 10 kOe magnetic field, a magnetic paint was prepared by dispersing in a polyurethane resin, a vinyl chloride-vinyl acetate copolymer resin and a solvent. The prepared magnetic paint was applied on a PET (polyethylene terephthalate) substrate to obtain a magnetic card having a magnetic layer formed thereon.
【００３６】作製された磁気カードに記録する時の記録
電流波形を図１に示す。FIG. 1 shows a recording current waveform when recording on the manufactured magnetic card.
【００３７】図１において，記録電流波形のピークから
ピークへの変化時間をｔP ，ピークの立ち上がり時間を
ｔS ，記録電流波形の１周期をＴとする。記録電流波形
の変化率２ｔP ／ＴS ，立ち下がり率２ｔS ／Ｔをそれ
ぞれ０〜１００％，０〜８０％に変化させて磁気カード
に書き込み，その磁気カードの再生出力電圧ＶR を測定
した。さらに，この磁気カードに一方向磁界（消磁磁
界）を印加し，磁気記録情報の消去を行った。この消磁
処理を行った磁気カードの再生出力電圧ＶE を測定し
た。また，この時の記録密度は，２１０ＢＰＩである。In FIG. 1, the change time from the peak of the recording current waveform to the peak is t P , the rise time of the peak is t S , and one cycle of the recording current waveform is T. The rate of change of the recording current waveform 2t P / T S, 0~100% respectively falling rate 2t S / T, is changed to 0 to 80% writing to the magnetic card, measuring the reproduction output voltage V R of the magnetic card did. Further, a unidirectional magnetic field (demagnetizing magnetic field) was applied to the magnetic card to erase magnetically recorded information. Reproduction output voltage V E of the magnetic card performing this degaussing process were measured. The recording density at this time is 210 BPI.
【００３８】測定した結果を下記表１に示す。測定の結
果，変化率２ｔP ／Ｔ≦８０％さらに立ち上がり率２ｔ
S ／Ｔ≦４０％の磁気カードの再生出力電圧ＶR は約
４．０Ｖ以下であった。この結果より，記録電流波形を
制御（記録電流波形の変化率を２ｔP ／Ｔ≦８０％に，
さらに立ち上がり率を２ｔS ／Ｔ≦４０％に）すること
により，磁気カードの再生出力電圧を制御できることが
確認された。消磁磁界印加後は，全部の磁気カードの再
生出力電圧ＶE とも約４．２０［Ｖ］と一定になった。
よって，記録電流波形の変化率を２ｔP ／Ｔ≦８０％
に，さらに立ち上がり率を２ｔS ／Ｔ≦４０％で記録し
たカードの，再生出力電圧ＶE は増加したが，他の磁気
カードについては変化がなかった。The results of the measurement are shown in Table 1 below. As a result of the measurement, the change rate 2t P / T ≦ 80% and the rise rate 2t
The reproduction output voltage V R of the magnetic card with S / T ≦ 40% was about 4.0 V or less. Based on this result, the recording current waveform was controlled (the rate of change of the recording current waveform was set to 2t P / T ≦ 80%,
Further, it has been confirmed that the reproduction output voltage of the magnetic card can be controlled by setting the rising rate to 2 t S / T ≦ 40%. After demagnetizing the magnetic field application became constant at about 4.20 [V] with the reproduction output voltage V E of the whole of a magnetic card.
Therefore, the rate of change of the recording current waveform is 2t P / T ≦ 80%
The further rise rate of cards recorded in 2t S / T ≦ 40%, but increased reproducing output voltage V E is, no change for the other magnetic card.
【００３９】これら実験の結果より，本発明の磁気カー
ドに，記録電流波形の変化率を２ｔP ／Ｔ≦８０％に，
さらに立ち上がり率を２ｔS ／Ｔ≦４０％で情報を記録
し，その後に一方向磁界（消磁磁界）を印加すると，情
報を記録した後の再生出力電圧より，消磁磁界印加後の
再生出力電圧が増加することが確認された。From the results of these experiments, it was found that the recording current waveform change rate was 2t P / T ≦ 80% in the magnetic card of the present invention.
Further, when information is recorded at a rise rate of 2t S / T ≦ 40%, and then a unidirectional magnetic field (demagnetizing magnetic field) is applied, the reproduced output voltage after the demagnetizing magnetic field is applied is higher than the reproduced output voltage after recording the information. It was confirmed that it increased.
【００４０】[0040]
【表１】 [Table 1]
【００４１】（例２）例１の結果より，記録電流波形パ
ルス波形で変化率を２ｔP ／Ｔ＝１０％（２ｔP ／Ｔ≦
８０％）に，立ち下がり率を２ｔS ／Ｔ＝１０％（２ｔ
S ／Ｔ≦４０％）の条件で記録密度を，８０ＢＰＩ，１
２０ＢＰＩ，１６０ＢＰＩ，２００ＢＰＩ，２５０ＢＰ
Ｉ，３５０ＢＰＩと変化させ磁気カードに記録を行っ
た。１２０ＢＰＩでの記録波形を図２に示す。磁気カー
ドは例１と同様のカードである。その磁気カードの再生
出力電圧ＶR を測定した。さらに，この磁気カードに一
方向磁界（消磁磁界）を印加し，磁気記録情報の消去を
行った。この消磁処理を行った磁気カードの再生出力電
圧ＶE 測定した。これらの消去前の再生出力電圧の記録
密度特性を，図３に示す。消去後の再生出力電圧の記録
密度特性を図４，図５に示す。比較例としてＢａフェラ
イト（ＨｃJ ＝３．０ｋＯｅ）を同様の条件で塗工し，
記録した磁気カードの再生出力を示した。(Example 2) From the results of Example 1, the change rate of the recording current waveform pulse waveform was 2t P / T = 10% (2t P / T ≦
80%) and the fall rate is 2t S / T = 10% (2t
S / T ≦ 40%), the recording density was 80 BPI, 1
20BPI, 160BPI, 200BPI, 250BP
The recording was performed on a magnetic card while changing to I, 350 BPI. FIG. 2 shows a recording waveform at 120 BPI. The magnetic card is the same card as in Example 1. The reproduction output voltage V R of the magnetic card was measured. Further, a unidirectional magnetic field (demagnetizing magnetic field) was applied to the magnetic card to erase magnetically recorded information. The degaussing process was reproduced output voltage V E measured for magnetic cards were performed. FIG. 3 shows the recording density characteristics of the reproduced output voltage before the erasure. 4 and 5 show the recording density characteristics of the reproduced output voltage after erasing. As a comparative example, Ba ferrite (Hc J = 3.0 kOe) was applied under the same conditions.
The reproduction output of the recorded magnetic card is shown.
【００４２】本発明の例の磁気カードでは，消去処理前
の再生出力は，記録密度の増加に伴い減少しているのが
わかる。この結果より，記録密度を制御することによ
り，再生出力電圧を自由に変化させることができる。次
に，消去処理後の再生出力であるが，２００ＢＰＩ以下
の記録密度では，消去処理前の再生出力より減少してい
るが，２００ＢＰＩ以上の記録密度では増加しているの
がわかる。In the magnetic card according to the embodiment of the present invention, it can be seen that the reproduction output before the erasing process decreases as the recording density increases. From this result, it is possible to freely change the reproduction output voltage by controlling the recording density. Next, with respect to the reproduction output after the erasure processing, it can be seen that at a recording density of 200 BPI or less, the reproduction output decreases from the reproduction output before the erasure processing, but increases at a recording density of 200 BPI or more.
【００４３】一方，比較例の磁気カードでは，消去処理
前の再生出力は，記録密度の増加に伴い若干減少傾向で
あるが３５０ＢＰＩで約１０％の減少とほとんど減少し
ないのがわかる。消去処理後は再生出力は全て消去され
る。On the other hand, in the magnetic card of the comparative example, the reproduced output before the erasing process is slightly decreasing with the increase in the recording density, but it is seen that the output is hardly decreased by about 10% at 350 BPI. After the erasing process, all reproduction outputs are erased.
【００４４】これら実験の結果より，本発明の磁気カー
ドに，記録電流波形の変化率を２ｔP ／Ｔ≦８０％に，
さらに立ち上がり率を２ｔS ／Ｔ≦４０％で，記録密度
を変化させて情報を記録することにより再生出力電圧を
変化させられることが確認された。その後に一方向磁界
（消磁磁界）を印加すると，２００ＢＰＩ以下の記録密
度では，消去処理前の再生出力より減少し，２００ＢＰ
Ｉ以上の記録密度では増加することが確認された。According to the results of these experiments, the rate of change of the recording current waveform was set to 2 t P / T ≦ 80% in the magnetic card of the present invention.
Further, it was confirmed that the reproduction output voltage could be changed by recording information while changing the recording density at a rise rate of 2t S / T ≦ 40%. After that, when a unidirectional magnetic field (demagnetizing magnetic field) is applied, at a recording density of 200 BPI or less, the reproduction output before the erasing process is reduced to 200 BP.
It was confirmed that the recording density increased at a recording density of I or more.
【００４５】（例３）例１と同様のカードに記録密度
を，８０ＢＰＩ，１６０ＢＰＩ，３５０ＢＰＩで，記録
波形をパルス波形（２ｔP ／Ｔ＝１０％，２ｔS ／Ｔ＝
１０％）と鋸波（２ｔP ／Ｔ＝１００％，２ｔS ／Ｔ＝
５０％）で磁気カードに記録を行った。その磁気カード
の再生出力電圧ＶR を測定した。さらに，この磁気カー
ドに一方向磁界（消磁磁界）を印加し，磁気記録情報の
消去を行った。この消磁処理を行った磁気カードの再生
出力電圧ＶE 測定した。これらの消去前後の再生出力電
圧を下記表２に示す。(Example 3) The recording density was set to 80 BPI, 160 BPI, and 350 BPI on the same card as in Example 1, and the recording waveform was changed to a pulse waveform (2 t P / T = 10%, 2 t S / T =
10%) and sawtooth waves (2t P / T = 100%, 2t S / T =
(50%). The reproduction output voltage V R of the magnetic card was measured. Further, a unidirectional magnetic field (demagnetizing magnetic field) was applied to the magnetic card to erase magnetically recorded information. The degaussing process was reproduced output voltage V E measured for magnetic cards were performed. The reproduced output voltages before and after the erasure are shown in Table 2 below.
【００４６】消去前の再生出力は鋸波の方が高い。これ
は，パルス波より鋸波の方が記録減磁の影響が少ないと
考えられる。３５０ＢＰＩの時の出力増加率もパルス波
の方が大きくなっている。よって，記録波形を変化させ
ることでも，再生出力電圧を変化させられることがわか
った。The reproduced output before erasing is higher for the sawtooth wave. This is presumably because sawtooth waves have less influence of recording demagnetization than pulse waves. The output increase rate at 350 BPI is also larger for the pulse wave. Therefore, it was found that the reproduction output voltage could be changed by changing the recording waveform.
【００４７】[0047]
【表２】 [Table 2]
【００４８】（例４）１０ｋＯｅ磁場印加後の保磁力Ｈ
ｃが，それぞれ１４ｋＯｅ，７ｋＯｅ，４．５ｋＯｅ，
３ｋＯｅの粉末を作製した。保磁力Ｈｃ＝１４ｋＯｅと
７ｋＯｅの粉末はＳｍ−Ｃｏ−Ａｌ合金の磁性粉末。保
磁力Ｈｃ＝４．５ｋＯｅと３ｋＯｅの粉末は，Ｂａフェ
ライト粉末である。Example 4 Coercive force H after application of a 10 kOe magnetic field
c is 14 kOe, 7 kOe, 4.5 kOe, respectively.
A powder of 3 kOe was produced. The powders with coercive force Hc = 14 kOe and 7 kOe are magnetic powders of Sm-Co-Al alloy. The powders having coercive forces Hc = 4.5 kOe and 3 kOe are Ba ferrite powders.
【００４９】これら３種の粉末を用い，ウレタン系樹脂
・塩化ビニル−酢酸ビニル共重合樹脂などと混合し磁性
塗料を作製した。作製した磁性塗料を，ＰＥＴ（ポリエ
チレンテレフタレート）の基体上に塗布して，磁性層を
形成した磁気カードを得た。These three types of powders were mixed with a urethane resin, a vinyl chloride-vinyl acetate copolymer resin, etc. to prepare a magnetic paint. The prepared magnetic paint was applied on a PET (polyethylene terephthalate) substrate to obtain a magnetic card having a magnetic layer formed thereon.
【００５０】作製したそれぞれの磁気カードに，記録情
報を記録電流波形（パルス波）の変化率を２ｔP ／Ｔ＝
０％，４０％，８０％に，さらに立ち上がり率を２ｔS
／Ｔ＝０％，２０％，記録密度を２１０ＢＰＩで記録
し，再生出力電庄を測定した。その後，一方向磁界（消
磁磁界）を印加してから，また再生出力電圧を測定し
た。The recording information was recorded on each of the manufactured magnetic cards at a rate of change of the recording current waveform (pulse wave) of 2 t P / T =
0%, 40%, 80% and 2t S
/ T = 0%, 20%, recording density was recorded at 210 BPI, and the reproduction output voltage was measured. After that, a unidirectional magnetic field (demagnetizing magnetic field) was applied, and the read output voltage was measured again.
【００５１】情報を記録後の再生出力電圧ＶR と，消磁
磁界印加後の再生出力電圧ＶE の測定結果，および再生
出力電圧の増加率（ＶE −ＶR ）／ＶR を下記表３に示
す。表３より，保磁力が３ｋＯｅの粉末では，消磁磁界
を印加すると再生出力信号は検出されず，記録情報は消
去されることがわかった。以上の結果より，保磁力が４
ｋＯｅ以上である磁性粉を使用していることにより，記
録情報が消去されることなく検出されることを特徴とす
る磁気カードが得られ，消磁磁界を印加後の再生出力電
圧が変化することが確認された。The measurement results of the reproduction output voltage V R after recording the information, the reproduction output voltage V E after the application of the demagnetizing magnetic field, and the rate of increase of the reproduction output voltage (V E −V R ) / V R are shown in Table 3 below. Shown in From Table 3, it was found that when the coercive force was 3 kOe, the reproduction output signal was not detected when the demagnetizing magnetic field was applied, and the recorded information was erased. From the above results, the coercive force was 4
By using a magnetic powder of kOe or more, it is possible to obtain a magnetic card characterized in that the recorded information is detected without being erased, and the reproduction output voltage after the application of the demagnetizing magnetic field is changed. confirmed.
【００５２】[0052]
【表３】 [Table 3]
【００５３】（例５）例３と同様にして，１０ｋＯｅ磁
場印加後の保磁力Ｈｃが，それぞれ１４ｋＯｅ，７ｋＯ
ｅ，４．５ｋＯｅ，３ｋＯｅの粉末を作製した。保磁力
Ｈｃ＝１４ｋＯｅと７ｋＯｅの粉末はＳｍ−Ｃｏ−Ａｌ
合金の磁性粉末。保磁力Ｈｃ＝４．５ｋＯｅと３ｋＯｅ
の粉末は，Ｂａフェライト粉末である。(Example 5) In the same manner as in Example 3, the coercive force Hc after applying a 10 kOe magnetic field was 14 kOe and 7 kOe, respectively.
e, 4.5 kOe and 3 kOe powders were produced. Coercive force Hc = 14 kOe and 7 kOe powder is Sm-Co-Al
Alloy magnetic powder. Coercive force Hc = 4.5 kOe and 3 kOe
Is a Ba ferrite powder.
【００５４】これら３種の粉末を用い，ウレタン系樹脂
・塩化ビニル−酢酸ビニル共重合樹脂などと混合し磁性
塗料を作製した。作製した磁性塗料を，ＰＥＴ（ポリエ
チレンテレフタレート）の基体上に塗布して，磁性層を
形成した磁気カードを得た。These three types of powders were mixed with a urethane resin, a vinyl chloride-vinyl acetate copolymer resin, and the like to prepare a magnetic paint. The prepared magnetic paint was applied on a PET (polyethylene terephthalate) substrate to obtain a magnetic card having a magnetic layer formed thereon.
【００５５】作製したそれぞれの磁気カードに，記録情
報を記録電流波形（パルス波）の変化率を２ｔP ／Ｔ＝
１０％に，さらに立ち上がり率を２ｔS ／Ｔ＝１０％で
記録密度を８０，１６０，３５０ＢＰＩで記録し，再生
出力電圧を測定した。その後，一方向磁界（消磁磁界）
を印加してから，また再生出力電圧を測定した。記録波
形は図２に示す。The recording information was recorded on each of the manufactured magnetic cards at a rate of change of the recording current waveform (pulse wave) of 2 t P / T =
Recording was performed at a recording density of 80, 160, and 350 BPI at a rise rate of 2 t S / T = 10%, and the reproduction output voltage was measured. Then, one-way magnetic field (demagnetizing magnetic field)
, And the reproduction output voltage was measured again. The recording waveform is shown in FIG.
【００５６】情報を記録後の再生出力電圧ＶR と，消磁
磁界印加後の再生出力電圧ＶE の測定結果，および再生
出力電圧の増加率（ＶE −ＶR ）／ＶR を下記表４に示
す。表４より，保磁力が３ｋＯｅの粉末では，消磁磁界
を印加すると再生出力信号は検出されず，記録情報は消
去されることがわかった。保磁力が４．５ｋＯｅ，７．
０ｋＯｅ，１４．０ｋＯｅと増加するに従い消去処理前
後の再生出力の差は，小さくなり７．０ｋＯｅ，１４．
０ｋＯｅでは，記録密度により消去処理後の再生出力は
増加する場合がある。以上の結果より，保磁力が４ｋＯ
ｅ以上である磁性粉を使用していることにより，記録情
報が消去されることなく記録密度によって異なる出力が
検出されることを特徴とする磁気カードが得られ，消磁
磁界を印加後の再生出力電圧も同様に記録密度によって
変化することが確認された。The measurement results of the reproduction output voltage V R after recording the information, the reproduction output voltage V E after the application of the demagnetizing magnetic field, and the rate of increase (V E −V R ) / V R of the reproduction output voltage are shown in Table 4 below. Shown in From Table 4, it was found that in the case of powder having a coercive force of 3 kOe, the reproduction output signal was not detected when the demagnetizing magnetic field was applied, and the recorded information was erased. Coercivity is 4.5 kOe, 7.
As the values increase to 0 kOe and 14.0 kOe, the difference between the reproduction outputs before and after the erasing process becomes smaller and becomes 7.0 kOe and 14 kOe.
At 0 kOe, the reproduction output after the erasing process may increase depending on the recording density. From the above results, the coercive force was 4 kO
e, a magnetic card characterized in that different outputs are detected depending on the recording density without erasing the recorded information, and the reproduction output after applying a demagnetizing magnetic field is obtained. It was confirmed that the voltage also changed depending on the recording density.
【００５７】[0057]
【表４】 [Table 4]
【００５８】（例６）次に，２種類の記録密度で記録す
る手段により，実際に磁気カードを得た。(Example 6) Next, a magnetic card was actually obtained by means of recording at two different recording densities.
【００５９】例１と同様にＳｍ−Ｃｏ−Ａｌ合金を水素
吸蔵・粉砕・熱処理して，１０ｋＯｅ磁場印加後の保磁
力が１４ｋＯｅの磁性粉末を製造した。この粉末を用
い，ウレタン系樹脂・塩化ビニル−酢酸ビニル共重合樹
脂などと混合し磁性塗料を作製した。作製した磁性塗料
を，ＰＥＴ（ポリエチレンテレフタレート）の基体上に
塗布して，磁性層を形成し，さらにその上に保護層を形
成した磁気カードを得た。比較例として保磁力が３．０
ｋＯｅのＢａフェライト粉末を上記と同様の方式で磁気
カードを作製した。The Sm-Co-Al alloy was occluded with hydrogen, pulverized, and heat-treated in the same manner as in Example 1 to produce a magnetic powder having a coercive force of 14 kOe after applying a 10 kOe magnetic field. This powder was mixed with a urethane resin, a vinyl chloride-vinyl acetate copolymer resin, and the like to prepare a magnetic paint. The prepared magnetic paint was applied on a PET (polyethylene terephthalate) substrate to form a magnetic layer, and a magnetic card having a protective layer formed thereon was obtained. As a comparative example, the coercive force is 3.0
A magnetic card was prepared from kOe Ba ferrite powder in the same manner as described above.
【００６０】図６は，後述する図７の長手方向から見た
VI−VI線断面図である。２はＰＥＴ，３は磁性層，４は
保護層である。図７は，本発明の例による磁気カードを
説明するための磁性層の面からみた平面図である。磁気
カード１の磁性層３には磁気カード１の長手方向での両
端間にのびたストライプ状の情報記録トラック５が設け
られている。情報記録領域５は，図８では便宜的に明瞭
に目視でき得るように記載したが，実際には目視できな
い形態で設けられることが望ましい。FIG. 6 is a view from the longitudinal direction of FIG.
It is a VI-VI sectional view. 2 is a PET, 3 is a magnetic layer, and 4 is a protective layer. FIG. 7 is a plan view of a magnetic layer for explaining a magnetic card according to an example of the present invention. The magnetic layer 3 of the magnetic card 1 is provided with stripe-shaped information recording tracks 5 extending between both ends in the longitudinal direction of the magnetic card 1. Although the information recording area 5 is described in FIG. 8 so as to be clearly visible for the sake of convenience, it is preferable that the information recording area 5 is provided in a form that is not actually visible.
【００６１】本発明の特徴としては，情報記録領域５
は，初期情報としての情報を２種類以上の記録密度で長
手方向に磁気的に記録するための一方のトラック手段と
しての情報記録領域５１と他方のトラック手段としての
情報記録領域５２を備えていることである。従って，情
報記録領域５１と情報記録領域５２とは記録密度が異な
り，２種類の斜線で示した。（情報記録領域の情報は，
磁気バーコード等で形成しても良い）。As a feature of the present invention, the information recording area 5
Is provided with an information recording area 51 as one track means and an information recording area 52 as the other track means for magnetically recording information as initial information in two or more kinds of recording densities in the longitudinal direction. That is. Therefore, the information recording area 51 and the information recording area 52 have different recording densities, and are indicated by two types of oblique lines. (The information in the information recording area is
It may be formed of a magnetic barcode or the like).
【００６２】磁気カード１を使用する毎にカードリーダ
ーで信号の有無及び記録密度の異なる２種類以上の信号
レベルを読み取り，図８の（２）に示すように，情報記
録領域５１−１と情報記録領域５１−２を消去する（こ
れは使用度数によって異なる場合がある）。この消去処
理後の情報記録領域５１−１と情報記録領域５２−１の
信号レベルを読み取る。また，この消去処理前後の５１
−１と５１−２との比較しチェックを行った後，この情
報を使用する。この工程を使用毎に行い，同様のチェッ
クを行う。Each time the magnetic card 1 is used, a card reader reads two or more types of signal levels having different signal presence / absence and recording density, and as shown in (2) of FIG. Erase the recording area 51-2 (this may vary depending on the number of uses). The signal levels of the information recording area 51-1 and the information recording area 52-1 after the erasing process are read. In addition, 51 before and after this erasing process
After comparing and checking -1 and 51-2, this information is used. This process is performed for each use, and the same check is performed.
【００６３】この結果，Ｂａフェライトカードの場合，
記録の消去（図８の（２））を行ったところ，記録信号
は消去前の１０％以下の出力に消去されて，使用できな
くなった。また，本発明カードの場合，初期状態とは，
全く異なる記録情報を得ることが出来た。この本発明の
磁気カードを図８の（３）に示すように，最終状態にし
た後，磁気ヘッドを用い，全ての記録信号を消去し，図
８の（１）の状態に戻そうと試みたが，９０（％）以上
の出力が残留し，記録信号は，消去されなかった。さら
に，６Ｔの磁界中で消磁を行い，図８の（１）の状態に
戻した場合でも，次の処理である図８の（２）の消去で
記録信号は１０％以下の出力に消去されて使用できなく
なった。As a result, in the case of a Ba ferrite card,
When the recording was erased ((2) in FIG. 8), the recording signal was erased to an output of 10% or less of that before the erasure, and could not be used. In the case of the card of the present invention, the initial state is
Completely different recorded information could be obtained. After bringing the magnetic card of the present invention into the final state as shown in FIG. 8 (3), an attempt is made to erase all recorded signals using a magnetic head and return to the state of FIG. 8 (1). However, an output of 90% or more remained, and the recorded signal was not erased. Further, even when degaussing is performed in a magnetic field of 6T and the state is returned to the state of (1) in FIG. 8, the recording signal is erased to an output of 10% or less by the next erasure in (2) of FIG. Can no longer be used.
【００６４】以上のことより，本発明の磁気カードおよ
び磁気記録方式を用いることにより，優れたセキュリテ
ィが得られる。As described above, excellent security can be obtained by using the magnetic card and the magnetic recording system of the present invention.
【００６５】また，上記例では，磁気記録層が１層であ
るが，多層であっても良く，磁気カードの製造方式も限
定されるものではない。In the above example, the magnetic recording layer is a single layer, but may be a multilayer, and the method of manufacturing the magnetic card is not limited.
【００６６】しかも，磁気ヘッドの構造等により，再生
出力変化の仕方等は，影響されるが，本方式の原理は，
左右されるものではない。In addition, the manner of changing the reproduction output is affected by the structure of the magnetic head and the like.
It doesn't matter.
【００６７】[0067]
【発明の効果】本発明によれば，磁気カードに記録情報
を記録するときの記録電流波形をコントロールし，２種
類以上の記録密度（１種類以上の記録波形）または，２
種類以上の記録波形（１種類以上の記録密度）で記録
後，記録密度または情報記録時の記録波形の違いによ
る再生出力差を検知すること，一方向磁界を印加処理
後，さらに，処理後の記録密度または情報記録時の記
録波形の違いによる磁気情報の再生出力差を検知するこ
と，処理前後の再生出力差を検知することの項目を少
なくとも１種類以上組み合わせることにより高セキュリ
ティの磁気カード，および磁気記録再生方法（特にカー
ドおよび情報の真贋判定に効果大）を得ることが出来
る。従って，セキュリティ上極めて有益である。According to the present invention, the recording current waveform when recording information is recorded on a magnetic card is controlled, and two or more recording densities (one or more recording waveforms) or two or more recording densities are recorded.
After recording with more than one type of recording waveform (one or more types of recording density), detecting the difference in reproduction output due to the difference in recording density or recording waveform at the time of information recording, after applying a unidirectional magnetic field, and further after processing A high-security magnetic card by combining at least one of the following items: detecting a difference in reproduction output of magnetic information due to a difference in recording density or a recording waveform at the time of recording information; and detecting a difference in reproduction output before and after processing. It is possible to obtain a magnetic recording / reproducing method (particularly effective for determining authenticity of a card and information). Therefore, it is extremely useful for security.
【図１】（ａ）〜（ｅ）は，本発明の実施の形態の磁気
カードの記録再生方法に係る記録電流ｉの波形図であ
る。1 (a) to 1 (e) are waveform diagrams of a recording current i according to a magnetic card recording / reproducing method according to an embodiment of the present invention.
【図２】図１の磁気カードの記録再生方法に係る記録電
流ｉの波形を説明するための図である。FIG. 2 is a diagram for explaining a waveform of a recording current i according to the magnetic card recording / reproducing method of FIG.
【図３】本発明の例による磁気カードの記録再生方法に
係る消去処理前の例および比較例の記録密度と出力との
関係を示す図である。FIG. 3 is a diagram illustrating a relationship between recording density and output in an example before an erasing process and a comparative example according to a magnetic card recording / reproducing method according to an example of the present invention.
【図４】本発明の例による磁気カードの記録再生方法に
係る消去処理前後の例の記録密度と出力との関係を示す
図である。FIG. 4 is a diagram illustrating a relationship between recording density and output before and after an erasing process according to a magnetic card recording / reproducing method according to an example of the present invention.
【図５】本発明の例による磁気カードの記録再生方法に
係る消去処理前後の比較例の記録密度と出力との関係を
示す図である。FIG. 5 is a diagram showing a relationship between a recording density and an output of a comparative example before and after an erasing process according to a magnetic card recording / reproducing method according to an example of the present invention.
【図６】本発明の実施の形態に係る磁気カードの記録再
生方法に用いられた磁気カード１の断面図である。FIG. 6 is a cross-sectional view of the magnetic card 1 used in the magnetic card recording / reproducing method according to the embodiment of the present invention.
【図７】図６の磁気カード１の平面図である。FIG. 7 is a plan view of the magnetic card 1 of FIG.
【図８】図７の磁気カード１において，磁性層３の一部
に形成された磁気記録領域としてのストライプ状の情報
記録トラック５に係る記録信号の波形の状態を説明する
ための図である。8 is a diagram for explaining a state of a waveform of a recording signal relating to a stripe-shaped information recording track 5 as a magnetic recording area formed in a part of the magnetic layer 3 in the magnetic card 1 of FIG. .
１ 磁気カード ２ ＰＥＴ ３ 磁性層 ４ 保護層 ５ ストライプ状の情報記録トラック ｔP 記録電流波形の変化時間 ｔs 記録電流波形の立ち上がり時間 Ｔ 記録電流波形の周期 ｉｐ 記録電流波形の記録電流Reference Signs List 1 magnetic card 2 PET 3 magnetic layer 4 protective layer 5 stripe-shaped information recording track t P change time of recording current waveform t s rise time of recording current waveform T period of recording current waveform ip recording current of recording current waveform
Claims (16)
録層を有し，前記磁気記録層に対して磁気ヘッドを用い
て情報を記録又は再生する磁気カードの記録再生方法に
おいて，前記磁性層の磁気記録領域に，記録電流の波形
の立ち上がり時間，及び立ち下がり（減衰）時間の内の
少なくとも一方が，前記記録電流の波形の半周期の４０
〜１００％である波形を有する前記記録電流で記録する
ことを特徴とする磁気カードの記録再生方法。1. A recording / reproducing method for a magnetic card which has a magnetic recording layer on at least a part of a non-magnetic substrate and records or reproduces information on the magnetic recording layer using a magnetic head. In the magnetic recording area, at least one of the rise time and the fall (decay) time of the recording current waveform is 40% of the half cycle of the recording current waveform.
A recording / reproducing method for a magnetic card, wherein recording is performed with the recording current having a waveform of about 100%.
録層を有し，前記磁気記録層に対して磁気ヘッドを用い
て情報を記録又は再生する磁気カードの記録再生方法に
おいて，前記磁性層の磁気記録領域に，前記記録電流の
波形の立ち上がり時間及び立ち下がり（減衰）時間の内
の少なくとも一方が，前記記録電流の波形の半周期の４
０％以下であり，且つ前記記録電流の波形の極大をなす
部分の変化時間が当該記録電流の波形の１周期の８０％
以下である波形を有する前記記録電流で記録することを
特徴とする磁気カードの記録再生方法。2. A recording / reproducing method for a magnetic card which has a magnetic recording layer on at least a part of a non-magnetic substrate and records or reproduces information on the magnetic recording layer using a magnetic head. In the magnetic recording area, at least one of the rise time and the fall (decay) time of the waveform of the recording current is set to 4 times of the half cycle of the waveform of the recording current.
0% or less, and the change time of the portion forming the maximum of the recording current waveform is 80% of one cycle of the recording current waveform.
A recording / reproducing method for a magnetic card, wherein recording is performed with the recording current having the following waveform.
カードの記録再生方法を用いる部分と請求項２記載の磁
気カードの記録再生方法を用いる部分とを備えているこ
とを特徴とする磁気カードの記録再生方法。3. A magnetic card comprising a portion using the magnetic card recording / reproducing method according to claim 1 and a portion using the magnetic card recording / reproducing method according to claim 2 at an arbitrary time. Recording and playback method.
法おいて，磁気情報が記録されている部分の磁気情報を
読み込んだ際，記録波形または，かつ，記録密度を変化
させ記録した２種類以上の再生出力差を検出し，磁気情
報に付加することを特徴とする磁気カードの記録再生方
法。4. The magnetic card recording / reproducing method according to claim 3, wherein when the magnetic information of the portion where the magnetic information is recorded is read, the recording waveform and / or the recording density are changed and recorded. A recording / reproducing method for a magnetic card, comprising detecting the above-mentioned reproduction output difference and adding the difference to magnetic information.
法において，磁気情報が記録されている部分に一方向磁
界を印加処理し，磁気情報を読み込んだ際，印加処理後
の磁気情報の再生出力差を検出することを特徴とした磁
気カードの記録再生方法。5. The magnetic card recording / reproducing method according to claim 3, wherein a unidirectional magnetic field is applied to a portion where the magnetic information is recorded, and when the magnetic information is read, the magnetic information after the application process is reproduced. A magnetic card recording / reproducing method characterized by detecting an output difference.
法において，磁気情報が記録されている部分に一方向磁
界を印加処理をすることにより，磁気情報を読み込んだ
際，処理前後の記録情報再生出力差を検知することを特
徴とする磁気カードの記録再生方法。6. The recording / reproducing method for a magnetic card according to claim 3, wherein a unidirectional magnetic field is applied to a portion where the magnetic information is recorded, so that when the magnetic information is read, the recording information before and after the processing is read. A recording / reproducing method for a magnetic card, comprising detecting a reproduction output difference.
ードの記録再生方法において，少なくとも１種類以上の
方式を組み合わせ，磁気情報に付加することを特徴とす
る磁気カードの記録再生方法。7. The magnetic card recording / reproducing method according to claim 4, wherein at least one or more types are combined and added to magnetic information.
法において，２種類以上の記録密度で記録することを特
徴とする磁気カードの記録再生方法。8. The magnetic card recording / reproducing method according to claim 2, wherein recording is performed at two or more types of recording densities.
法おいて，磁気情報が記録されている部分の磁気情報を
読み込んだ際，記録波形または，かつ，記録密度を変化
させ記録した２種類以上の再生出力差を検出し，磁気情
報に付加することを特徴とする磁気カードの記録再生方
法。9. The magnetic card recording / reproducing method according to claim 8, wherein when reading the magnetic information of the portion where the magnetic information is recorded, the recording waveform or the recording density is changed to record the two types. A recording / reproducing method for a magnetic card, comprising detecting the above-mentioned reproduction output difference and adding the difference to magnetic information.
方法において，磁気情報が記録されている部分に一方向
磁界を印加処理し，磁気情報を読み込んだ際，印加処理
後の磁気情報の再生出力差を検出することを特徴とする
磁気カードの記録再生方法。10. A magnetic card recording / reproducing method according to claim 8, wherein a one-way magnetic field is applied to a portion where the magnetic information is recorded, and when the magnetic information is read, the magnetic information after the application process is reproduced. A recording / reproducing method for a magnetic card, comprising detecting an output difference.
方法において，磁気情報が記録されている部分に一方向
磁界を印加処理をすることにより，磁気情報を読み込ん
だ際，処理前後の記録情報再生出力差を検知することを
特徴とする磁気カードの記録再生方法。11. The recording / reproducing method for a magnetic card according to claim 8, wherein a unidirectional magnetic field is applied to a portion where the magnetic information is recorded, so that when the magnetic information is read, the recorded information before and after the processing is read. A recording / reproducing method for a magnetic card, comprising detecting a reproduction output difference.
の磁気カードの記録再生方法において，少なくとも１種
類以上の方式を組み合わせ，磁気情報に付加することを
特徴とする磁気カードの記録再生方法。12. A magnetic card recording / reproducing method according to claim 9, wherein at least one or more types are combined and added to magnetic information. Method.
の磁気カードの記録再生方法において磁気記録層の一
部，あるいは全ての情報が消去不可能又は困難であるこ
とを特徴とする磁気カードの記録再生方法。13. The magnetic card recording / reproducing method according to claim 1, wherein a part or all of the information on the magnetic recording layer is erasable or difficult. Card recording and playback method.
の磁気カードの記録再生方法において，保磁力が４ｋＯ
ｅ以上である磁性粉を使用していることを特徴とする磁
気カードの記録再生方法。14. A method according to claim 1, wherein the coercive force is 4 kO.
e. A magnetic card recording / reproducing method using a magnetic powder of e or more.
の磁気カードの記録再生方法において，当該磁気カード
の磁気記録層には，一般式Ｒx Ｔ100-x-y Ｍy （但し，
ＲはＳｍを必須成分とするＹを含む希土類元素から選択
された少なくとも１種，Ｔは，Ｃｏを主成分とする遷移
金属Ｆｅ，Ｃｏ，Ｎｉの内から選択された少なくとも１
種，Ｍは，Ｓｉ，Ｔｉ，Ａ１，Ｇａ，Ｖ，Ｃｒ，Ｍｎ，
Ｃｕ，Ｚｒ，Ｎｂ，Ｍｏ，Ｐｄ，Ｈｆ，Ｔａ，Ｗ，Ｐ
ｔ，およびＡｕの内の少なくとも１種の元素で表され，
Ｒの組成値ｘは１６．０〜２２．０ａｔ％，Ｍの組成値
ｙは０，３０．０ａｔ％である。）で示される合金粉末
を使用していることを特徴とする磁気カードの記録再生
方法。15. The recording and reproducing method of a magnetic card according to any one of claims 1 to 12, the magnetic recording layer of the magnetic card, the general formula R x T 100-xy M y ( where,
R is at least one element selected from rare earth elements including Y containing Sm as an essential component, and T is at least one element selected from transition metals Fe, Co, and Ni containing Co as a main component.
Species, M is Si, Ti, A1, Ga, V, Cr, Mn,
Cu, Zr, Nb, Mo, Pd, Hf, Ta, W, P
t, and at least one element of Au;
The composition value x of R is 16.0 to 22.0 at%, and the composition value y of M is 0.30.0 at%. A recording / reproducing method for a magnetic card, comprising using the alloy powder represented by the formula (1).
載の磁気カードの記録再生方法に用いられることを特徴
とする磁気カード。16. A magnetic card used in the magnetic card recording / reproducing method according to claim 1. Description:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10097074A JPH11296804A (en) | 1998-04-09 | 1998-04-09 | Recording and reproducing method of magnetic card and the card used in the method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10097074A JPH11296804A (en) | 1998-04-09 | 1998-04-09 | Recording and reproducing method of magnetic card and the card used in the method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11296804A true JPH11296804A (en) | 1999-10-29 |
Family
ID=14182503
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10097074A Withdrawn JPH11296804A (en) | 1998-04-09 | 1998-04-09 | Recording and reproducing method of magnetic card and the card used in the method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11296804A (en) |
-
1998
- 1998-04-09 JP JP10097074A patent/JPH11296804A/en not_active Withdrawn
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20050705 |