JP2626858B2 - Manufacturing method of magnetic recording medium - Google Patents
Manufacturing method of magnetic recording mediumInfo
- Publication number
- JP2626858B2 JP2626858B2 JP4157401A JP15740192A JP2626858B2 JP 2626858 B2 JP2626858 B2 JP 2626858B2 JP 4157401 A JP4157401 A JP 4157401A JP 15740192 A JP15740192 A JP 15740192A JP 2626858 B2 JP2626858 B2 JP 2626858B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- magnetic layer
- recording
- information
- layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Description
【０００１】[0001]
【産業上の利用分野】本発明は買物カード、預貯金カー
ド、定期券、乗車券、回数券、プリペイドカード、キャ
シュカード、クレジットカード、ポイントカード、身分
証明書、診察券等において、生産性が高く偽造し難い磁
気記録媒体の製造方法を提供するものである。The present invention has high productivity in shopping cards, savings and savings cards, commuter passes, tickets, coupons, prepaid cards, cash cards, credit cards, point cards, identification cards, medical examination tickets, etc. there is provided a method of manufacturing a forged hard magnetic recording medium body.
【０００２】[0002]
【従来の技術】近時、磁気記録を行なったカード類が前
記のような利用分野で広く用いられ、ますますその用途
が拡大してきている。その基本構造は非磁性体からなる
基体の上に、磁性体の層を設け、これを磁化したもので
ある。かかる磁気記録媒体は、磁気情報の複製や改ざん
により不正使用が発生するのを防止することが必要で、
このため種々の不正使用防止策がとられている。代表的
な偽造変造防止法としては、磁気記録情報の記録，再生
を困難にする方法と、磁気カードそのものに真偽判定情
報を持たせる方法とに大別される。前者は記録された磁
気情報を隠蔽し、情報の書込み，読み取りを難しくする
ことにより磁気情報の改ざんや複製を困難にする方法で
あり、後者は磁気カードが正規のものか否かを判定する
ための識別情報をカードそのものに入れておくことによ
り偽造、変造を防ぐ方法である。2. Description of the Related Art Recently, cards on which magnetic recording has been performed have been widely used in the above-mentioned fields of use, and the applications thereof have been increasing. The basic structure is such that a magnetic layer is provided on a base made of a non-magnetic substance and magnetized. Such magnetic recording media need to prevent unauthorized use due to duplication or falsification of magnetic information,
For this reason, various measures for preventing unauthorized use have been taken. Typical forgery / falsification prevention methods are roughly classified into a method of making recording and reproduction of magnetic recording information difficult, and a method of providing the magnetic card itself with authenticity determination information. The former is a method of hiding recorded magnetic information and making it difficult to write or read information, thereby making it difficult to falsify or duplicate magnetic information. The latter is a method for determining whether a magnetic card is genuine. This is a method of preventing forgery and falsification by putting the identification information of the card in the card itself.
【０００３】[0003]
【発明が解決しようとする課題】磁気情報の記録，再生
を困難にすることによる不正使用防止策として知られて
いるものには、磁気記録部を多層化することにより、正
規の情報を隠蔽して読み取り不能にしたり、ダミー情報
を重畳して正規の情報の解析を困難にするものである
が、何分にも製造工程が複雑であり、かつ記録の書き込
み読み出し装置が複雑になる等の欠点があり、又、一旦
情報を隠蔽する方法の詳細が判明してしまえば、磁気記
録に詳しい者であれば、情報を読み出し、解析すること
が可能であるので複製や変造を防ぎ切れない可能性があ
る。磁気カードそのものに真偽判定情報を施したカード
は正しい判定情報を持った正規のカードでなければ、例
え磁気情報の偽造ができたとしても実際に使用できない
が、この方法も製造工程が複雑で、判定情報の読み出し
装置が複雑になるという欠点がある。又、正規のカード
の真偽判定情報が偽造された場合は不正使用を防ぎ切れ
ないと云う問題がある。本発明は前記従来の技術の有す
る課題を解決することを目的とする。One of the known measures to prevent unauthorized use of magnetic information by making it difficult to record and reproduce magnetic information is to hide the legitimate information by making the magnetic recording section multi-layered. To make it difficult to read legitimate information by superimposing dummy information. However, the drawbacks are that the manufacturing process is complicated and the writing / reading device for recording becomes complicated. Also, once the details of the method of concealing information are known, anyone familiar with magnetic recording may be able to read and analyze the information, so it may not be possible to prevent duplication and alteration There is. If magnetic card itself regular authenticity card subjected to determination information with the correct determination information cards, can not be actually used even possible counterfeit magnetic information even if complicated production process this method Therefore, there is a drawback that the determination information reading device becomes complicated. Also, there is a problem that the not be to prevent unauthorized use if authenticity determination information regular card is counterfeit. An object of the present invention is to solve the problems of the conventional technology.
【０００４】[0004]
【課題を解決するための手段】本発明の概要は、非磁性
体からなる基体の上に２５０エルステッド以上４０００
エルステッド以下の保磁力の磁性体からなる磁気塗料を
塗布、乾燥することにより、第１の磁性層を形成し、つ
いで該磁性層に磁気記録を行ない、しかる後４５００エ
ルステッド以上の高保磁力磁性体からなる磁気塗料を塗
布、乾燥することにより第２の磁性層を形成することを
特徴とする磁気記録媒体の製造方法である。SUMMARY OF THE INVENTION An outline of the present invention is that a substrate made of a non- magnetic material has a thickness of 250 Oe or more and 4000 or more.
A first magnetic layer is formed by applying and drying a magnetic paint composed of a magnetic material having a coercive force of Oersted or less, and then magnetic recording is performed on the magnetic layer. magnetic paint coating comprising a preparation how the magnetic recording medium and forming a second magnetic layer by drying.
【０００５】以下図面を参照しつゝ本発明を説明する。
図１（イ）は本発明による磁気記録媒体（カード）の平
面図で、磁気記録トラックＴを有する。図１（ロ）はト
ラックＴのＸ−Ｘ’線断面図で非磁性層からなる基体１
の上に２５０エルステッド以上４０００エルステッド以
下の保磁力の磁性体からなる第１の磁性層２、４５００
エルステッド以上の高保磁力磁性体からなり、塗布後乾
燥前に磁気パターン状に着磁して形成された後で追加も
消去もし難い情報が記録された第２の磁性層３、必要に
より更に被覆層（図示せず）が積層されて本発明の磁気
記録媒体を構成してもよい。次に本発明の磁気記録媒体
を構成する材料について述べる。先ず非磁性体からなる
基体としては、厚さ１５０μｍ〜１ｍｍのポリエステル
フィルム、塩化ビニルフィルム、合成紙、木材パルプ
紙、ラミネート紙等のシート状の非磁性体が適用でき
る。 第１の磁性層に用いる磁性体としては、γ一酸化
鉄、コバルトドープのγ一酸化鉄、酸化クロム、バリウ
ムフェライト、ストロンチウムフェライト等が適用さ
れ、これらの磁性体を塩化ビニル・醋酸ビニル共重合
体、塩化ビニル・醋酸ビニル・ビニルアルコール共重合
体、ポリウレタン樹脂、ポリエステル樹脂、エポキシ樹
脂、ポリイソシアネート樹脂等の結着剤に顔料等の他の
添加剤とともに分散した塗液を基体上に塗布することに
よって第１の磁性層を形成することができる。The present invention will be described below with reference to the drawings.
FIG. 1A is a plan view of a magnetic recording medium (card) according to the present invention, and has a magnetic recording track T. FIG. FIG. 1B is a cross-sectional view taken along the line XX ′ of the track T.
A first magnetic layer 2, 4500 made of a magnetic material having a coercive force of 250 to 4000 Oe
It consists of Oe or more of the high-coercivity magnetic material, after coating dry
Before drying, a second magnetic layer 3 on which information which is hardly added or erased after being formed by magnetizing into a magnetic pattern is recorded, and a coating layer (not shown) is further laminated if necessary. You may comprise a magnetic recording medium. Next, the material constituting the magnetic recording medium of the present invention will be described. First, as a substrate made of a non-magnetic material, a sheet-like non-magnetic material such as a polyester film, a vinyl chloride film, a synthetic paper, a wood pulp paper, a laminated paper having a thickness of 150 μm to 1 mm can be applied. As the magnetic material used for the first magnetic layer, γ-iron monoxide, cobalt-doped γ-iron monoxide, chromium oxide, barium ferrite, strontium ferrite, etc. are applied. Coating liquid dispersed in a binder such as coalesce, vinyl chloride / vinyl acetate / vinyl alcohol copolymer, polyurethane resin, polyester resin, epoxy resin, polyisocyanate resin etc. together with other additives such as pigments is applied to the substrate. Thereby, the first magnetic layer can be formed.
【０００６】又、第２の磁性層としては、バリウムフェ
ライト、ストロンチウムフェライトおよびこれらの金属
イオン置換体等が適用され、これらの磁性体を前記第１
の磁性層に用いると同様の結着剤に顔料等他の添加剤と
ともに分散した塗液を第１の磁性層上に塗布することに
よって第２の磁性層を形成することができる。又、前記
第２の磁性層の上に必要に応じて設ける被覆層は、 （ａ）前記磁性層の着色を隠蔽するためのアルミニウム
粉末、白色顔料等を含んだ着色層 （ｂ）ロイコ染料型感熱記録層，錫，アルミニウム等の
金属蒸着層からなる放電記録層等の印字記録層 （ｃ）紫外線硬化型樹脂からなる保護層 のうちの１層もしくは複数層を順次積層して形成するこ
とができる。As the second magnetic layer, barium ferrite, strontium ferrite, or a metal ion substitute thereof is applied.
The second magnetic layer can be formed by applying a coating solution in which the same binder is dispersed together with other additives such as a pigment to the first magnetic layer. The coating layer provided as required on the second magnetic layer includes: (a) a colored layer containing aluminum powder, a white pigment, and the like for concealing the coloring of the magnetic layer; and (b) a leuco dye type. A print recording layer such as a heat-sensitive recording layer, a discharge recording layer formed of a metal deposited layer of tin, aluminum, or the like. (C) One or more layers of a protective layer formed of an ultraviolet-curable resin may be sequentially laminated. it can.
【０００７】本発明の製造方法について説明すれば例え
ば、図２に示すように非磁性体からなる基体Ｓを送出し
リール１１より送り出し、塗工ヘッド１３を有する第１
の磁性層用の塗布装置１２に導いて塗工する。基体上に
第１の磁性層が塗布された塗布体はロール１４を経て磁
場配向器１５、乾燥パート１６、ロール１７を経て巻取
りリール１８に巻き取られる。巻き取られた製品は第１
の磁性層のみが塗布された原反である。なお磁性層は磁
場配向を行なうことが好ましいがこれを行なわなくても
よい。次に図３に示すように第１の磁性層用塗料のみが
塗布された原反の巻取リールを送り出しリール１９とし
て、磁気ヘッド２０で第１の磁性層に情報を磁気記録し
た後、第２の磁性層用塗布装置２１に導き塗工ヘッド２
２で塗工し、ロール２３、磁場配向器２４、乾燥パート
２５、ロール２６を経て巻取リール２７に本発明による
磁気記録媒体を巻取るようになっている。なお更に被覆
層を設ける場合は、これを別途被覆層層用塗料の塗布装
置を介して塗布巻取れば容易に実施できる（図示しな
い）。The manufacturing method of the present invention will be described. For example, as shown in FIG. 2, a substrate S made of a non-magnetic material is sent out from a reel 11 and a first substrate S having a coating head 13 is provided.
To the magnetic layer coating device 12 for coating. The coated body on which the first magnetic layer is coated on the substrate is wound on a take-up reel 18 via a magnetic field director 15, a drying part 16 and a roll 17 via a roll 14. Wound product is first
This is a raw material on which only the magnetic layer was applied. The magnetic layer is preferably oriented in a magnetic field, but need not be oriented. Next, as shown in FIG. 3, the take-up reel of the raw material to which only the first magnetic layer paint is applied is used as the take-out reel 19, and the magnetic head 20 magnetically records information on the first magnetic layer. 2 to the coating device 21 for the magnetic layer.
The magnetic recording medium according to the present invention is wound on a take-up reel 27 via a roll 23, a magnetic field orienter 24, a drying part 25, and a roll 26. When a coating layer is further provided, it can be easily implemented by separately applying and winding this through a coating device for coating material for the coating layer (not shown).
【０００８】上記の方法に於て、第１の磁性層は２５０
〜４０００エルステッドの通常の磁気記録媒体と同程度
の保磁力であるから、磁性層形成後は容易に磁気記録用
ヘッドで磁気記録することができる。ついで４５００エ
ルステッド以上の高保磁力磁性層を第１の磁性層に積層
するように塗布すると、塗布直後の第２の磁性層が乾燥
する前の状態では、磁性層は見かけ上保磁力が低くなっ
た状態となり、先に行なった第１の磁性層の磁気記録パ
ターンが転写し、同じ磁気記録パターン状に着磁する。
続いてこの第２の磁性層を乾燥させると、４５００エル
ステッド以上の高保磁力磁性層に磁気記録状態が固定化
されたこととなり、通常用いられる磁気ヘッドでは後で
の追加記録も消去もできない、不正使用防止情報として
使うことのできる情報を媒体に与えることができる。こ
の情報は第１の磁性記録情報を転写させる方法により記
録されるため、情報の記録パターンは第１の磁性層への
記録パターンに依存する。すなわち通常の磁気バーコー
ド等は個々のカードそれぞれに異なった情報を持たせる
ことは不可能であるが、本発明による方法は、第１の磁
性層に記録するパターンを個々のカードに対応して異な
ったものとすれば、個々のカードに異なった判定情報を
付与することが可能である。In the above method, the first magnetic layer has a thickness of 250
Since the coercive force is approximately the same as that of a normal magnetic recording medium of up to 4000 Oersted, magnetic recording can be easily performed by a magnetic recording head after the formation of the magnetic layer. Then, when a high coercive force magnetic layer of 4500 Oe or more was applied so as to be laminated on the first magnetic layer, the magnetic layer apparently had a low coercive force immediately after the application and before the second magnetic layer was dried. In this state, the previously performed magnetic recording pattern of the first magnetic layer is transferred and magnetized in the same magnetic recording pattern.
When is subsequently drying the second magnetic layer, 4 5 00 Oe or more magnetic recording state high coercivity magnetic layer becomes to have been immobilized can not be erased even additional recording later in the normal magnetic head for use Information that can be used as unauthorized use prevention information can be provided to the medium. Since this information is recorded by a method of transferring the first magnetic recording information, the recording pattern of the information depends on the recording pattern on the first magnetic layer. That is, it is impossible for a normal magnetic barcode or the like to have different information on each individual card, but the method according to the present invention uses a pattern recorded on the first magnetic layer in accordance with each individual card. If it is different, it is possible to give different judgment information to each card.
【０００９】[0009]
【実施例】以下本発明の実施例について述べる。 実施例１ 第１の磁性層の塗料を以下の配合で調製した。 バリウムフェライト ＢａＯ・６Ｆｅ2 Ｏ3 保磁力２７５０エルステッド 比表面積８ｍ2 ／ｇ １００重量部 カーボンブラック ３重量部 レシチン １重量部 塩化ビニル・酢酸ビニル・ビニルアルコール共重合体 ２０重量部 ポリウレタン樹脂 ２０重量部 トルエン ６０重量部 メチルエチルケトン ６０重量部 メチルイソブチルケトン ６０重量部 上記配合からなる混合物をボールミルで８時間分散した
後、ポリイソシアネート樹脂５重量部を添加し、更に１
時間分散を行い、第１の磁性層用塗料を得た。塗布は通
常の磁気記録媒体の製造方法に従って行えばよい。即ち
図２に示したように、１８８μｍ厚さの白色ポリエステ
ルフィルムに塗工ヘッド部で磁気塗料を塗布し、塗料を
乾燥する前に磁場配向処理を行い、乾燥装置中で乾燥さ
せ、１２μｍ厚さの磁性層を形成し、磁気原反として巻
取る。塗布を行うとき、磁性層は磁場配向を行うことが
好ましいが、磁場配向処理を行わなくとも良い。Embodiments of the present invention will be described below. Example 1 A paint for the first magnetic layer was prepared with the following composition. Barium ferrite BaO · 6Fe 2 O 3 coercive force 2750 Oersted Specific surface area 8 m 2 / g 100 parts by weight Carbon black 3 parts by weight Lecithin 1 part by weight Vinyl chloride / vinyl acetate / vinyl alcohol copolymer 20 parts by weight Polyurethane resin 20 parts by weight Toluene 60 parts by weight Methyl ethyl ketone 60 parts by weight Methyl isobutyl ketone 60 parts by weight After dispersing the mixture having the above composition in a ball mill for 8 hours, 5 parts by weight of a polyisocyanate resin was added, and 1 part of
Time dispersion was performed to obtain a first magnetic layer paint. The coating may be performed according to a usual method for manufacturing a magnetic recording medium. That is, as shown in FIG. 2, a magnetic paint is applied to a 188 μm-thick white polyester film by a coating head portion, a magnetic field orientation treatment is performed before the paint is dried, and the paint is dried in a drying device to be 12 μm-thick. Is formed and wound up as a magnetic substrate. When applying, the magnetic layer is preferably oriented in a magnetic field, but the magnetic field orientation treatment need not be performed.
【００１０】ついで、第２の磁性層用の塗料を以下の配
合で調製した。 ストロンチウムフェライト ＳｒＯ・６Ｆｅ2 Ｏ3 保磁力８０００エルステッド 比表面積５ｍ2 ／ｇ １００重量部 カーボンブラック ３重量部 レシチン １重量部 塩化ビニル・酢酸ビニル・ビニルアルコール共重合体 ２０重量部 ポリウレタン樹脂 ２０重量部 トルエン ６０重量部 メチルエチルケトン ６０重量部 メチルイソブチルケトン ６０重量部 上記配合からなる混合物をボールミルで８時間分散した
後、ポリイソシアネート樹脂５重量部を添加し、更に１
時間分散を行い、第２の磁性層用塗料を得た。塗布は第
１の磁性層を形成した磁気原反に、第１の磁性層に積層
する形で第２の磁性層用の塗料を塗布する。塗布は第１
の磁性層を形成するのと同様に行えばよい。但し図３に
示したように、第２の磁性層用磁性塗料を塗布する前
に、第１の磁性層に磁気ヘッドを用いて予め磁気記録を
行う。磁気記録はヘッドギャップ５０μｍの磁気ヘッド
を用い、第１の磁性層を充分に飽和記録できる記録電流
で記録を行った。記録は１００ｂｐｉのＦＭ方式で行っ
た。次いで図３に示したように、塗工ヘッド部で磁気塗
料を塗布し、塗料を乾燥する前に磁場配向処理を行い、
乾燥装置中で乾燥させ、６μｍ厚さの第２の磁性層を形
成し、本発明の磁気記録媒体を作製した。このようにし
て得た本発明の磁気記録媒体をＪＩＳサイズの磁気カー
ドに打ち抜き加工し、以下の評価を行った。Next, a paint for the second magnetic layer was prepared with the following composition. Strontium ferrite SrO.6Fe 2 O 3 Coercive force 8000 Oersted Specific surface area 5 m 2 / g 100 parts by weight Carbon black 3 parts by weight Lecithin 1 part by weight Vinyl chloride / vinyl acetate / vinyl alcohol copolymer 20 parts by weight Polyurethane resin 20 parts by weight Toluene 60 parts by weight Methyl ethyl ketone 60 parts by weight Methyl isobutyl ketone 60 parts by weight After dispersing the mixture having the above composition in a ball mill for 8 hours, 5 parts by weight of a polyisocyanate resin was added, and 1 part of
Time dispersion was performed to obtain a second magnetic layer paint. The coating is performed by applying a coating material for the second magnetic layer on the magnetic raw material on which the first magnetic layer is formed, in a form of being laminated on the first magnetic layer. Application is first
May be performed in the same manner as when the magnetic layer is formed. However, as shown in FIG. 3, before applying the magnetic paint for the second magnetic layer, magnetic recording is performed on the first magnetic layer in advance using a magnetic head. The magnetic recording was performed using a magnetic head having a head gap of 50 μm at a recording current capable of sufficiently recording the first magnetic layer in saturation. Recording was performed by the 100 bpi FM method. Next, as shown in FIG. 3, a magnetic paint is applied by a coating head portion, and a magnetic field orientation treatment is performed before the paint is dried.
The resultant was dried in a drying apparatus to form a second magnetic layer having a thickness of 6 μm, thereby producing a magnetic recording medium of the present invention. The magnetic recording medium of the present invention thus obtained was punched into a JIS size magnetic card, and the following evaluation was performed.
【００１１】即ち、図１（イ）に示すように塗工時に第
１の磁性層に記録を行った後図１（ロ）に示すように第
２の磁性層を形成した部分に、図１（イ）のトラックＴ
上を２７５０エルステッドの磁性層を飽和記録できる記
録条件で直流消去を行った後、再生用磁気ヘッドで情報
の読み出しを行ったところ、図１（ハ）に示すように第
１の磁性層に記録された情報は消去されたが、第２の８
０００エルステッドの磁性層には第１の磁性層の記録情
報が転写、固定化しており、この情報は消去されないた
め、読み出すことができた。この情報は、４０００エル
ステッドまでの保磁力を持つ磁性層に記録，消去できる
磁気ヘッドでは記録も消去もできなっかた。また、この
磁気カードのトラックＴ以外の部分に４０００エルステ
ッドまでの保磁力を持つ磁性層に記録、消去できる磁気
ヘッドで１００ｂｐｉの記録密度でＦＭ方式で記録を行
なったところ、通常に記録，再生できた。すなわち通常
の磁気カードとして使用できた。That is, as shown in FIG. 1A, recording is performed on the first magnetic layer at the time of coating, and then, as shown in FIG. (B) Truck T
After DC erasing was performed under recording conditions that allowed the magnetic layer of 2750 Oersted to saturate, the information was read out using a reproducing magnetic head. As shown in FIG. 1C, the information was recorded on the first magnetic layer. Information is erased, but the second 8
The recorded information of the first magnetic layer was transferred and fixed to the 000 Oersted magnetic layer, and this information was not erased, so that it could be read. This information could not be recorded or erased by a magnetic head capable of recording and erasing information on a magnetic layer having a coercive force of up to 4000 Oe. Further, when recording was performed by a magnetic head at a recording density of 100 bpi with a magnetic head capable of recording and erasing data on a magnetic layer having a coercive force of up to 4000 Oersted on a portion other than the track T of the magnetic card, it was possible to perform normal recording and reproduction. Was. That is, it could be used as a normal magnetic card.
【００１２】実施例２ 第１の磁性層用の塗料を以下の配合で調製した。 バリウムフェライト ＢａＯ・６Ｆｅ2 Ｏ3 保磁力２７５０エルステッド 比表面積８ｍ2 ／ｇ １００重量部 カーボンブラック ３重量部 レシチン １重量部 塩化ビニル・酢酸ビニル・ビニルアルコール共重合体 ２０重量部 ポリウレタン樹脂 ２０重量部 トルエン ６０重量部 メチルエチルケトン ６０重量部 メチルイソブチルケトン ６０重量部 上記配合からなる混合物をボールミルで８時間分散した
後、ポリイソシアネート樹脂５重量部を添加し、更に１
時間分散を行い、第１の磁性層用塗料を得た。塗布は通
常の磁気記録媒体の製造方法に従って行えばよい。即ち
図２に示したように、１８８μｍ厚さの白色ポリエステ
ルフィルムからなる基体上に塗工ヘッドで前記配合の磁
気塗料を塗布し、塗料を乾燥する前に磁場配向処理を行
い、乾燥装置中で乾燥させ、１２μｍ厚さの磁性層を形
成し、磁気原反として巻取った。塗布を行うとき、磁性
層は磁場配向を行うことが好ましいが、磁場配向処理を
行わなくとも良い。ついで、この磁気原反をシート状に
裁断した。続いてこの磁気シートに、磁気記録装置を用
いて磁気記録を行った。即ちヘッドギャップ５０μｍの
磁気ヘッドを用い、第１の磁性層を充分に飽和記録でき
る記録電流で記録を行った。記録は１００ｂｐｉのＦＭ
方式で行った。Example 2 A paint for the first magnetic layer was prepared with the following composition. Barium ferrite BaO · 6Fe 2 O 3 coercive force 2750 Oersted Specific surface area 8 m 2 / g 100 parts by weight Carbon black 3 parts by weight Lecithin 1 part by weight Vinyl chloride / vinyl acetate / vinyl alcohol copolymer 20 parts by weight Polyurethane resin 20 parts by weight Toluene 60 parts by weight Methyl ethyl ketone 60 parts by weight Methyl isobutyl ketone 60 parts by weight After dispersing the mixture having the above composition in a ball mill for 8 hours, 5 parts by weight of a polyisocyanate resin was added, and 1 part of
Time dispersion was performed to obtain a first magnetic layer paint. The coating may be performed according to a usual method for manufacturing a magnetic recording medium. That is, as shown in FIG. 2, the magnetic paint of the above-mentioned composition was applied by a coating head onto a base made of a white polyester film having a thickness of 188 μm, and a magnetic field orientation treatment was performed before the paint was dried. After drying, a magnetic layer having a thickness of 12 μm was formed and wound as a magnetic substrate. When applying, the magnetic layer is preferably oriented in a magnetic field, but the magnetic field orientation treatment need not be performed. Next, the magnetic material was cut into a sheet. Subsequently, magnetic recording was performed on the magnetic sheet using a magnetic recording device. That is, using a magnetic head having a head gap of 50 μm, recording was performed at a recording current capable of sufficiently recording the first magnetic layer in saturation. The record is 100 bpi FM
The method was performed.
【００１３】このようにして得た記録済み磁気シート
に、スクリーン印刷方式を用いて第２の磁性層を形成し
た。第２の磁性層用のインキを以下の配合で調製した。 ストロンチウムフェライト ＳｒＯ・６Ｆｅ2 Ｏ3 保磁力８０００エルステッド 比表面積５ｍ2 ／ｇ １００重量部 カーボンブラック ３重量部 レシチン １重量部 塩化ビニル・酢酸ビニル・ビニルアルコール共重合体 ２０重量部 ポリウレタン樹脂 ２０重量部 キシレン ６０重量部 メチルイソブチルケトン ６０重量部 イソホロン ６０重量部 上記配合からなる混合物をボールミルで８時間分散した
後、ポリイソシアネート樹脂５重量部を添加し、更に１
時間分散を行い、第２の磁性層用スクリーンインキを得
た。このようにして得た磁性インキをスクリーン印刷方
式を用い、第１の磁性層を形成し磁気記録を行った磁気
原反シートの第１の磁性層に積層して印刷、乾燥させ、
第２の磁性層を６μｍになるように形成し本発明の磁気
記録媒体を得た。A second magnetic layer was formed on the recorded magnetic sheet thus obtained by using a screen printing method. An ink for the second magnetic layer was prepared with the following composition. Strontium ferrite SrO.6Fe 2 O 3 Coercive force 8000 Oersted Specific surface area 5 m 2 / g 100 parts by weight Carbon black 3 parts by weight Lecithin 1 part by weight Vinyl chloride / vinyl acetate / vinyl alcohol copolymer 20 parts by weight Polyurethane resin 20 parts by weight Xylene 60 parts by weight Methyl isobutyl ketone 60 parts by weight Isophorone 60 parts by weight After dispersing the mixture having the above composition in a ball mill for 8 hours, 5 parts by weight of a polyisocyanate resin was added, and 1 part was further added.
Time dispersion was performed to obtain a second magnetic layer screen ink. The magnetic ink thus obtained is laminated on the first magnetic layer of the magnetic source sheet on which the first magnetic layer has been formed and magnetic recording has been performed by using a screen printing method, followed by printing and drying.
The second magnetic layer was formed so as to have a thickness of 6 μm to obtain the magnetic recording medium of the present invention.
【００１４】このようにして得た磁気記録媒体をＪＩＳ
サイズの磁気カードに打ち抜き加工を施し以下の評価を
行った。即ち、塗工時に第１の磁性層に記録を行った後
第２の磁性層を形成した部分に、２７５０エルステッド
の磁性層を飽和記録できる記録条件で直流消去を行った
後、再生用磁気ヘッドで情報の読み出しを行ったとこ
ろ、第１の磁性層に記録された情報は消去されたが、第
２の８０００エルステッドの磁性層には第１の磁性層の
記録情報が転写、固定化しており、この情報は消去され
ないため、読み出すことができた。この情報は、４００
０エルステッドまでの保磁力を持つ磁性層に記録、消去
できる磁気ヘッドでは記録も消去もできなかった。ま
た、この磁気カードのトラックＴ以外の部分に４０００
エルステッドまでの保磁力を持つ磁性層に記録、消去で
きる磁気ヘッドで１００ｂｐｉの記録密度でＦＭ方式で
記録を行なったところ、通常に記録，再生できた。すな
わち通常の磁気カードとして使用できた。The magnetic recording medium obtained in this way is JIS
A magnetic card of a size was punched and evaluated as follows. That is, after performing recording on the first magnetic layer at the time of coating, a portion where the second magnetic layer is formed is subjected to DC erasure under a recording condition capable of recording the magnetic layer of 2750 Oersted in saturation, and then the magnetic head for reproduction is obtained. As a result, the information recorded in the first magnetic layer was erased, but the information recorded in the first magnetic layer was transferred and fixed to the second 8000 Oe magnetic layer. Since this information was not erased, it could be read. This information is 400
A magnetic head capable of recording and erasing on a magnetic layer having a coercive force up to 0 Oe did not record or erase. Also, 4000 parts are added to the magnetic card other than the track T.
Recording was performed by the FM method at a recording density of 100 bpi with a magnetic head capable of recording and erasing on a magnetic layer having a coercive force up to Oersted. That is, it could be used as a normal magnetic card.
【００１５】[0015]
【発明の効果】本発明の方法は通常の磁性層の上に更に
高保磁力の磁性層を積層することになり、第１の磁性層
に磁気記録された情報が第２の磁性層に転写されてい
る。たとえ第１の磁性層の磁気記録が消去される条件で
も第２の磁性層の情報が消去されることはなく、又第２
の磁性層への情報の追加は通常の磁気記録装置では不可
能である。加えて本発明の方法により製造されたカード
は、個々のカードの固有の判定情報を付与することがで
きるため、磁気記録媒体の変造、偽造は極めて困難であ
る。又、かゝる磁気記録媒体の製造も本発明の方法によ
り極めて容易に合理的に製造することが可能である。According to the method of the present invention, a magnetic layer having a higher coercive force is further laminated on a normal magnetic layer, and the information magnetically recorded on the first magnetic layer is transferred to the second magnetic layer. ing. Even under the condition that the magnetic recording of the first magnetic layer is erased, the information of the second magnetic layer is not erased.
It is impossible to add information to the magnetic layer of the conventional magnetic recording apparatus. In addition, since the card manufactured by the method of the present invention can be provided with unique judgment information of each card, it is extremely difficult to alter or forge the magnetic recording medium. Also, such a magnetic recording medium can be extremely easily and rationally manufactured by the method of the present invention.
【図１】（イ）は本発明の方法により得られた磁気記録
媒体の平面図 （ロ）は図１（イ）のＸ−Ｘ’線断面図で磁化した後の
磁気の状態図 （ハ）は図１（イ）のＸ−Ｘ’線断面図で第１の磁気層
の磁化を消去した磁気の状態図FIG. 1A is a plan view of a magnetic recording medium obtained by the method of the present invention. FIG. 1B is a magnetic state diagram after being magnetized along the line XX ′ in FIG. 1A. ) Is a cross-sectional view taken along the line XX ′ of FIG.
【図２】第１の磁性層の塗布工程図FIG. 2 is a drawing showing a coating process of a first magnetic layer.
【図３】第２の磁性層の塗布工程図FIG. 3 is a coating process diagram of a second magnetic layer.
Ｔ トラック １ 非磁性体からなる基体 ２ 第１の磁性層 ３ 第２の磁性層 １１ 送り出しリール １２ 第１の磁性層用塗布装置 １３ 塗工ヘッド １４ ロール １５ 磁場配向器 １６ 乾燥パート １７ ロール １８ 巻取りリール １９ 送り出しリール ２０ 磁気ヘッド ２１ 第２の磁性層用塗布装置 ２２ 塗工ヘッド ２３ ロール ２４ 磁場配向器 ２５ 乾燥パート ２６ ロール ２７ 巻取りリール T track 1 Base made of non-magnetic material 2 First magnetic layer 3 Second magnetic layer 11 Sending reel 12 First magnetic layer coating device 13 Coating head 14 Roll 15 Magnetic field aligner 16 Drying part 17 Roll 18 roll Take-up reel 19 Send-out reel 20 Magnetic head 21 Second magnetic layer coating device 22 Coating head 23 Roll 24 Magnetic field aligner 25 Drying part 26 Roll 27 Take-up reel
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｇ１１Ｂ 20/10 Ｇ０７Ｆ 7/08 Ｃ (56)参考文献 特開 平４−39097（ＪＰ，Ａ) 特開 昭62−33325（ＪＰ，Ａ) 特開 平３−130197（ＪＰ，Ａ) 特開 平２−195513（ＪＰ，Ａ) 特開 昭57−164429（ＪＰ，Ａ)──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 6 Identification number Agency reference number FI Technical indication location G11B 20/10 G07F 7/08 C (56) References JP-A-4-39097 (JP, A) JP-A-62-33325 (JP, A) JP-A-3-130197 (JP, A) JP-A-2-195513 (JP, A) JP-A-57-164429 (JP, A)
Claims (1)
ステッド以上４０００エルステッド以下の保磁力の磁性
体からなる磁気塗料を塗布、乾燥することにより第１の
磁性層を形成し、ついで該磁性層に磁気記録を行ない、
しかる後、４５００エルステッド以上の高保磁力磁性体
からなる磁気塗料を塗布、乾燥することにより第２の磁
性層を形成することを特徴とする磁気記録媒体の製造方
法。1. A first magnetic layer is formed by applying a magnetic coating composed of a magnetic substance having a coercive force of not less than 250 Oersteds and not more than 4000 Oersted on a base made of a nonmagnetic substance and drying the same, and then forming the first magnetic layer. Magnetic recording on
Thereafter, a second magnetic layer is formed by applying a magnetic coating composed of a magnetic material having a high coercive force of 4500 Oe or more and drying it to form a second magnetic layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4157401A JP2626858B2 (en) | 1992-05-26 | 1992-05-26 | Manufacturing method of magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4157401A JP2626858B2 (en) | 1992-05-26 | 1992-05-26 | Manufacturing method of magnetic recording medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05318974A JPH05318974A (en) | 1993-12-03 |
| JP2626858B2 true JP2626858B2 (en) | 1997-07-02 |
Family
ID=15648830
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4157401A Expired - Fee Related JP2626858B2 (en) | 1992-05-26 | 1992-05-26 | Manufacturing method of magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2626858B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5643686A (en) * | 1994-01-06 | 1997-07-01 | Tokyo Magnetic Printing Co., Ltd. | Magnetic recording medium and method for manufacturing the same |
| JP4623373B2 (en) * | 2005-07-29 | 2011-02-02 | Ｄｉｃ株式会社 | Magnetic label and magnetic recording medium manufactured using magnetic label |
| JP5445183B2 (en) * | 2010-02-04 | 2014-03-19 | 大日本印刷株式会社 | Magnetic recording medium and magnetic recording method for magnetic recording medium |
| JP5445213B2 (en) * | 2010-02-19 | 2014-03-19 | 大日本印刷株式会社 | Magnetic recording medium and magnetic recording method |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57164429A (en) * | 1981-04-01 | 1982-10-09 | Tokyo Jiki Insatsu Kk | Magnetic recording body |
| JPS6233325A (en) * | 1985-08-06 | 1987-02-13 | Tomoegawa Paper Co Ltd | Heat sensitive magnetic recording medium |
| JPH03130197A (en) * | 1988-12-21 | 1991-06-03 | Dainippon Printing Co Ltd | Manufacture of magnetic card |
| JP2949636B2 (en) * | 1990-06-05 | 1999-09-20 | 株式会社トーキン | How to determine the authenticity of a card |
-
1992
- 1992-05-26 JP JP4157401A patent/JP2626858B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05318974A (en) | 1993-12-03 |
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