JPH0729156A - Magnetic recording medium and manufacturing method thereof - Google Patents
Magnetic recording medium and manufacturing method thereofInfo
- Publication number
- JPH0729156A JPH0729156A JP4150086A JP15008692A JPH0729156A JP H0729156 A JPH0729156 A JP H0729156A JP 4150086 A JP4150086 A JP 4150086A JP 15008692 A JP15008692 A JP 15008692A JP H0729156 A JPH0729156 A JP H0729156A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- magnetic layer
- oersted
- recording
- weight
- 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.)
- Pending
Links
Landscapes
- Credit Cards Or The Like (AREA)
- Paints Or Removers (AREA)
- Magnetic Record Carriers (AREA)
- Manufacturing Of Magnetic Record Carriers (AREA)
Abstract
(57)【要約】
【目的】 偽造や不正使用を防止できる磁気記録媒体及
びその製造方法を提供すること。
【構成】 非磁性体からなる基体の上に、２５０エルス
テッド〜４０００エルステッドの保磁力の磁性体からな
る第１の磁性層と、０．５エルステッド〜１００エルス
テッドの低保磁力の磁性体からなる第２の磁性層を順次
積層した磁気記録媒体及びその製造方法。
(57) [Summary] [Purpose] To provide a magnetic recording medium capable of preventing forgery and unauthorized use, and a manufacturing method thereof. A first magnetic layer made of a magnetic material having a coercive force of 250 oersted to 4000 oersted and a magnetic material having a low coercive force of 0.5 oersted to 100 oersted on a substrate made of a non-magnetic material. A magnetic recording medium in which two magnetic layers are sequentially laminated and a method for manufacturing the same.
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
気記録媒体およびそ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, boarding tickets, coupons, prepaid cards, cash cards, credit cards, point cards, identification cards, medical examination tickets, etc. The present invention provides a magnetic recording medium that is difficult to forge and a manufacturing method thereof.
【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, magnetic recording cards have been widely used in the above-mentioned fields of use, and their applications have been expanding more and more. The basic structure is such that a magnetic layer is provided on a base body made of a non-magnetic material and magnetized. Such a magnetic recording medium is required to prevent unauthorized use due to duplication or alteration of magnetic information,
Therefore, various measures against illegal use have been taken. Typical forgery / alteration prevention methods are roughly classified into a method of making it difficult to record / reproduce magnetically recorded information and a method of making the magnetic card itself have authenticity determination information. The former is a method of hiding recorded magnetic information, making it difficult to tamper with or copy the magnetic information by making it difficult to write or read the information, and the latter is to judge whether the magnetic card is legitimate or not. This is a method of preventing forgery and alteration by putting the identification information of the above in the card itself.
【０００３】[0003]
【発明が解決しようとする課題】磁気記録情報の記録，
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、
一旦情報の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
カードの磁気情報が変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。Recording of magnetic recording information,
Known measures to prevent unauthorized use by making playback difficult include multi-layered magnetic recording sections to hide legitimate information and make it unreadable, or to superimpose dummy information on legitimate information. Although it makes the analysis of information difficult, there are drawbacks such that the manufacturing process is complicated for many minutes, and the recording and reading device is complicated.
Once the details of the method of hiding information are known, a person who is familiar with magnetic recording can read and analyze the information, so there is a possibility that duplication or alteration cannot be prevented. A magnetic card itself with authenticity information cannot be used unless it is a legitimate card with correct identification information, even if the magnetic information can be forged, but this method also has a complicated manufacturing process. However, there is a drawback that the device for reading the judgment information becomes complicated. In addition, there is a problem that unauthorized use cannot be prevented if the magnetic information of a legitimate card is altered. An object of the present invention is to solve the problems of the above conventional techniques.
【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〜４０００エ
ルステッドの保磁力の磁性体からなる第１の磁性層と、
０．５エルステッド〜１００エルステッドの低保磁力の
磁性体からなり、後で追加も消去も不可能な情報が記録
されてなる第２の磁性層を順次積層したことを特徴とす
る磁気記録媒体（請求項１）および、非磁性体からなる
基体の上に２５０エルステッド〜４０００エルステッド
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、０．５エルステッド〜１００
エルステッドの低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（請求項２）であ
る。SUMMARY OF THE INVENTION An outline of the present invention is to provide a first magnetic layer made of a magnetic material having a coercive force of 250 Oersted to 4000 Oersted on a substrate made of a non-magnetic material.
A magnetic recording medium characterized in that a second magnetic layer made of a magnetic material having a low coercive force of 0.5 Oersted to 100 Oersted and in which information that cannot be added or erased later is recorded is sequentially laminated ( The first magnetic layer is formed by applying a magnetic coating material made of a magnetic material having a coercive force of 250 Oersted to 4000 Oersted on a substrate made of a non-magnetic material and drying the first magnetic layer. Magnetic recording was performed on the magnetic recording medium and then 0.5 Oersted to 100
A method of manufacturing a magnetic recording medium, characterized in that a second magnetic layer is formed by applying and drying a magnetic paint made of an Oersted low coercive force magnetic material.
【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〜４０００エルステッドの保磁
力の磁性体からなる第１の磁性層２、０．５エルステッ
ド〜１００エルステッドの低保磁力磁性体からなり追加
も消去もしがたい情報が磁気記録された第２の磁性層
３、必要によりさらに被覆層（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。図１（ロ）の
第１の磁性層と第２の磁性層の磁化後の状態は図１
（ハ）のように、第１の磁性層の記録パターンの磁気反
転部界面に第２の磁性層の塗料が集まるため、本図のよ
うな構造となり、これが磁気バーコード状パターンとし
て固定される。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、カルボニル鉄粉，マンガン
ジンクフェライト，ニッケル粉，四三酸化鉄等が適用さ
れ、これらの磁性体を塩化ビニル・酢酸ビニル共重合
体，塩化ビニル・酢酸ビニル・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。又、第２の
磁性層に用いる磁性体としては、γ−酸化鉄，コバルト
ドープのγ−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。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, which has a magnetic recording track T. FIG. 1B is a cross-sectional view taken along the line X-X of the track T, in which a first magnetic layer 2 made of a magnetic material having a coercive force of 250 Oersted to 4000 Oersted and 0.5 Oersted on a base body 1 made of a non-magnetic layer. A second magnetic layer 3 made of a low coercive force magnetic substance of ˜100 Oersted and on which information that is hard to be added or erased is magnetically recorded, and if necessary, a coating layer (not shown) is further laminated on the magnetic recording medium of the present invention. May be configured. The state after magnetization of the first magnetic layer and the second magnetic layer in FIG. 1B is shown in FIG.
As shown in (c), the paint of the second magnetic layer gathers at the interface of the magnetic reversal part of the recording pattern of the first magnetic layer, so that the structure shown in this figure is obtained and this is fixed as a magnetic bar code pattern. . Next, materials constituting the magnetic recording medium of the present invention will be described. First, as the substrate made of a non-magnetic material, a polyester film having a thickness of 150 μm to 1 mm,
Sheet-shaped non-magnetic materials such as vinyl chloride film, synthetic paper, wood pulp paper, and laminated paper can be applied. Carbonyl iron powder, manganese zinc ferrite, nickel powder, ferrosoferric oxide, etc. are applied as the magnetic material used in the first magnetic layer, and these magnetic materials are used as vinyl chloride / vinyl acetate copolymer, vinyl chloride / acetic acid. The first magnetic layer is obtained by applying a coating liquid prepared by dispersing a binder such as a vinyl / vinyl alcohol copolymer, a polyurethane resin, a polyester resin, an epoxy resin, a polyisocyanate resin and other additives such as pigments on a substrate. Can be formed. Further, as the magnetic substance used for the second magnetic layer, γ-iron oxide, cobalt-doped γ-iron oxide, chromium oxide, barium ferrite, strontium ferrite, etc. are applied, and these magnetic substances are used for the first magnetic layer. The second magnetic layer can be formed by applying a coating solution in which the same binder as that used for the magnetic layer is dispersed together with other additives such as pigments onto the first magnetic layer. The coating layer provided on the second magnetic layer as needed includes (a) a colored layer containing aluminum powder, a white pigment, etc. for concealing the coloring of the magnetic layer, and (b) a leuco dye type. A heat-sensitive recording layer, a print recording layer such as a discharge recording layer formed of a metal vapor deposition 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 and formed. it can.
【０００６】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１を送り出
しリール１１より送り出し、第１の磁性層用の塗料の塗
布装置１２に導いて塗工する。塗工ヘッド１３で塗布さ
れた基体１はロール１４を経て磁場配向装置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。なお第１の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
反の巻取り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
の磁性層用の塗料の塗布装置２１に導き塗工ヘッド２２
で塗工し、ロール２３、乾燥パート２４、ロール２５を
経て巻取りリール２６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。なお被覆層を設ける場合は、こ
れを別途被覆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）。Explaining the manufacturing method of the present invention, for example, as shown in FIG. 2, a substrate 1 made of a non-magnetic material is delivered from a delivery reel 11 and guided to a coating device 12 for coating the first magnetic layer. Work. The substrate 1 applied by the coating head 13 passes through the roll 14, the magnetic field orientation device 15, the drying part 16, and the roll 17, and is then wound around the winding reel 18. The wound product is a raw material coated with only the first magnetic layer. It is preferable that the first magnetic layer be magnetically oriented, but this may not be performed. Next, as shown in FIG. 3, the original take-up reel coated with only the first magnetic layer coating material is used as the delivery reel 19 and the magnetic head 20 magnetically records information on the first magnetic layer. Two
The coating head 22 is guided to the coating device 21 for coating the magnetic layer.
The magnetic recording medium according to the present invention is wound on a take-up reel 26 through a roll 23, a drying part 24 and a roll 25. When a coating layer is provided, it can be easily carried out by coating and winding the coating layer separately through a coating layer coating device (not shown).
【０００７】上記の方法に於いて、第１の磁性層は２５
０エルステッド〜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。２
５０エルステッド未満では磁気記録後外部磁場により消
去されるという問題を生じ、４０００エルステッドを超
えて大きいと現在実用化されている磁気ヘッドの磁気記
録が不可能となる。又第２の磁性層の磁性体の保磁力は
０．５エルステッド〜１００エルステッドの低保磁力で
あるが、０．５エルステッド未満では材料が制限され、
その選択に制約がある。又、１００エルステッドを超え
て大きいと磁性塗料が図１（ハ）のように集合しにく
い、マグネチックビュアで着磁状態が識別されるという
問題を生ずる。In the above method, the first magnetic layer is 25
Since it has a coercive force of 0 Oersted to 4000 Oersted, which is about the same as that of a normal magnetic recording medium, magnetic recording can be easily performed by a magnetic recording head after the magnetic layer is formed. Two
If it is less than 50 Oersted, there is a problem that it is erased by an external magnetic field after magnetic recording, and if it is more than 4000 Oersted, magnetic recording of a magnetic head currently in practical use becomes impossible. The coercive force of the magnetic material of the second magnetic layer is a low coercive force of 0.5 Oersted to 100 Oersted, but if it is less than 0.5 Oersted, the material is limited,
There are restrictions on the choice. On the other hand, if it exceeds 100 Oersted, the magnetic paint is difficult to gather as shown in FIG. 1C, and the magnetized state is identified by the magnetic viewer.
【０００８】本発明に於いて、第２の磁性層を構成する
磁性塗料を第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、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低保磁力磁性体が集合する。続
いてこの第２の磁性層を乾燥させると、０．５エルステ
ッド〜１００エルステッドの低保磁力磁性体からなるバ
ーコード上のパターン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の磁気記録
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 present invention, when the magnetic coating material constituting the second magnetic layer is applied so as to be laminated on the first magnetic layer,
Immediately after the application, before the second magnetic layer is dried, the magnetic recording pattern of the first magnetic layer previously transferred is transferred, and the low coercive force magnetic substance aggregates in the same magnetic recording pattern. Subsequently, when the second magnetic layer was dried, the pattern on the bar code made of the low coercive force magnetic substance of 0.5 Oersted to 100 Oersted was fixed, and the later-described magnetic head used normally was used. Information that cannot be additionally recorded or erased and can be used as unauthorized use prevention information can be given to the medium. Since this information is recorded by the 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 bar code or the like to have different information for each card, but the method according to the present invention corresponds to each card with a pattern to be recorded on the first magnetic layer. If they are different,
It is possible to give different determination 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 １００重量部 （ 保磁力２７５０エルステッド 比表面積８ｍ2 ／ｇ） 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 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前記磁性層用塗料を塗布し、乾燥パ
ート中で乾燥させ、１２μｍ厚さの磁性層を形成し、磁
気原反として巻取る。第１の磁性層用塗料の塗布を行う
とき、乾燥パートに入る前に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。EXAMPLES Examples of the present invention will be described below. Example 1 A coating material for the first magnetic layer was prepared with the following composition. Barium ferrite BaO ・ 6Fe 2 O 3 100 parts by weight (coercive force 2750 Oersted specific surface area 8 m 2 / g) 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 Parts Toluene 60 parts by weight Methyl ethyl ketone 60 parts by weight Methyl isobutyl ketone 60 parts by weight After a mixture was dispersed for 8 hours in a ball mill, 5 parts by weight of a polyisocyanate resin was added and further dispersed for 1 hour to prepare a first magnetic layer. Got the paint. The coating may be carried out according to a usual method for manufacturing a magnetic recording medium. That is, as shown in FIG. 2, a white polyester film having a thickness of 188 μm was coated with the coating material for the magnetic layer by a coating head and dried in a drying part to form a magnetic layer having a thickness of 12 μm. Wind up as the opposite. When applying the first magnetic layer coating material, it is preferable to perform magnetic field orientation before entering the drying part, but it is not necessary to perform magnetic field orientation processing.
【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。 カルボニル鉄粉 １００重量部 （保磁力１０エルステッド 比表面積１ｍ2 ／ｇ） 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 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２０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、塗工ヘッド部で第２の磁性層用塗
料を塗布し、乾燥パート中で乾燥させ、６μｍ厚さの第
２の磁性層を形成し、本発明の磁気記録媒体として巻取
る。このようにして得た本発明による磁気記録媒体か
ら、ＪＩＳサイズの磁気カードを打ち抜き以下の評価を
行った。Then, a coating material for the second magnetic layer was prepared with the following composition. Carbonyl iron powder 100 parts by weight (coercive force 10 oersted specific surface area 1 m 2 / g) 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 After a mixture of 60 parts by weight of methyl ethyl ketone and 60 parts by weight of methyl isobutyl ketone was dispersed in a ball mill for 8 hours, 5 parts by weight of a polyisocyanate resin was added and further dispersed for 1 hour to obtain a second magnetic layer coating material. The application is performed by applying the coating material for the second magnetic layer on the magnetic material sheet on which the first magnetic layer is formed so as to be laminated on the first magnetic layer. The coating may be performed in the same manner as forming the first magnetic layer. However, as shown in FIG. 3, before applying the second magnetic layer coating material, magnetic recording is performed in advance on the first magnetic layer using a magnetic head. For the magnetic recording, the magnetic head 20 having a head gap of 50 μm was used, and recording was carried out with a recording current capable of sufficiently performing saturated recording on the first magnetic layer. The recording was performed by a 100 bpi FM system. Then, as shown in FIG. 3, the coating material for the second magnetic layer is applied by the coating head portion and dried in the drying part to form a second magnetic layer having a thickness of 6 μm. Take up as a medium. From the thus obtained magnetic recording medium according to the present invention, a JIS size magnetic card was punched out and the following evaluation was performed.
【００１１】即ち、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３０００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５００ガウスのバイアス磁界
をかけながら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。
又、この磁気カードのトラックＴ以外の部分に３０００
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, after recording on the first magnetic layer at the time of coating, 3000 is formed on the track T of FIG. 1 (a) at the portion where the second magnetic layer is formed as shown in FIG. 1 (b). Information was recorded on the first magnetic layer when the information was read by applying a bias magnetic field of 500 gauss with a reproducing magnetic head after direct current erasing was performed under a recording condition capable of saturation recording on the Oersted magnetic layer. Although the information was erased, the recorded information of the first magnetic layer was transferred and fixed to the second magnetic layer, and this information was not erased, so that the information could be read.
In addition, 3000 is recorded in a part other than the track T of this magnetic card.
When recording was performed in the FM system with a recording density of 100 bpi by a magnetic head capable of recording and erasing on a magnetic layer having a coercive force up to Oersted, normal recording and reproduction were possible. That is, it could be used as an ordinary magnetic card.
【００１２】実施例２ 第１の磁性層の塗料として以下の配合を調製したほかは
実施例１と同様にして、本発明の磁気記録媒体を作成し
た。 γ酸化鉄 １００重量部 （保磁力３００エルステッド 比表面積２０ｍ2 ／ｇ） 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 このようにして得た本発明の磁気記録媒体から、ＪＩＳ
サイズの磁気カードを打ち抜き実施例１と同様な評価を
行ったところ、実施例１と同様な結果を得た。また、こ
の磁気カードのトラックＴ以外の部分に３０００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。Example 2 A magnetic recording medium of the present invention was prepared in the same manner as in Example 1 except that the following composition was prepared as the coating material for the first magnetic layer. γ iron oxide 100 parts by weight (coercive force 300 oersted specific surface area 20 m 2 / g) 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 From the magnetic recording medium of the present invention thus obtained, JIS
When a size-sized magnetic card was punched out and evaluated in the same manner as in Example 1, the same results as in Example 1 were obtained. In addition, when recording was performed in the FM system at a recording density of 100 bpi with a magnetic head capable of recording and erasing on a magnetic layer having a coercive force of up to 3000 Oersted in a portion other than the track T of this magnetic card, normal recording and reproduction were possible. It was That is, it could be used as an ordinary magnetic card.
【００１３】実施例３ 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 １００重量部 （保磁力２７５０エルステッド 比表面積８ｍ2 ／ｇ） 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 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前記第１の磁性層用塗料を塗布し、
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、前記第１の磁性層は磁
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 3 A coating material for the first magnetic layer was prepared with the following composition. Barium ferrite BaO.6Fe 2 O 3 100 parts by weight (coercive force 2750 Oersted specific surface area 8 m 2 / g) 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 Parts Toluene 60 parts by weight Methyl ethyl ketone 60 parts by weight Methyl isobutyl ketone 60 parts by weight After a mixture was dispersed for 8 hours in a ball mill, 5 parts by weight of a polyisocyanate resin was added and further dispersed for 1 hour to prepare a first magnetic layer. Got the paint. The coating may be carried out according to a usual method for manufacturing a magnetic recording medium. That is, as shown in FIG. 2, the coating material for the first magnetic layer is applied to a white polyester film having a thickness of 188 μm by a coating head,
Before the coating material was dried, a magnetic field orientation treatment was performed, and the coating material was dried in a drying device to form a magnetic layer having a thickness of 12 μm, which was wound as a magnetic original sheet. When applying, it is preferable that the first magnetic layer be magnetically oriented, but it is not necessary to perform magnetic field orientation treatment. Then, the magnetic original sheet was cut into a sheet shape. Subsequently, magnetic recording was performed on this magnetic sheet using a magnetic recording device. That is, recording was performed using a magnetic head having a head gap of 50 μm at a recording current capable of sufficiently performing saturated recording on the first magnetic layer. The recording was performed by a 100 bpi FM system.
【００１４】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以下の手順にて第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。 カルボニル鉄粉 １００重量部 （保磁力１０エルステッド 比表面積１ｍ2 ／ｇ） 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 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の磁性層用のスクリーン印刷インキを得
た。このようにして得たスクリーン印刷インキをスクリ
ーン印刷方式を用い、第１の磁性層を形成し磁気記録を
行った磁気原反のシートの第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
した。A second magnetic layer was formed on the recorded magnetic sheet thus obtained by the following procedure using a screen printing method. An ink for the second magnetic layer was prepared with the following formulation. Carbonyl iron powder 100 parts by weight (coercive force 10 oersted specific surface area 1 m 2 / g) 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 ethyl ketone 60 parts by weight A mixture of methyl isobutyl ketone 60 parts by weight was dispersed in a ball mill for 8 hours, then 5 parts by weight of polyisocyanate resin was added, and further dispersed for 1 hour to prepare a screen printing ink for the second magnetic layer. Obtained. Using the screen printing ink thus obtained, the first magnetic layer was formed on the first magnetic layer of the magnetic material sheet on which the first magnetic layer was formed and the magnetic recording was carried out, printed, dried, and The second magnetic layer was formed to have a thickness of 6 μm.
【００１５】このようにして得た磁気原反から、ＪＩＳ
サイズの磁気カードを打ち抜き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なった後第２の磁
性層を形成したトラックＴの部分に、３０００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５００ガウスのバイアス磁
界をかけながら磁気情報の読出を行なったところ、第２
の磁性層に転写した第１の磁性層の記録情報は固定化し
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。又、この磁気カードのトラックＴ以外の部分に３
０００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。From the magnetic fabric thus obtained, JIS
A size magnetic card was punched out and the following evaluations were performed. That is, after performing recording on the first magnetic layer at the time of coating, direct current erasing was performed on the portion of the track T on which the second magnetic layer was formed under a recording condition capable of performing saturation recording of the magnetic layer of 3000 Oersted, and then reproducing. Magnetic information was read while applying a bias magnetic field of 500 Gauss with a magnetic head for use.
The recorded information of the first magnetic layer transferred to the magnetic layer of No. 1 was fixed and this information was not erased, so that it could be read. In addition, it is 3 in the part other than the track T of this magnetic card.
Recording on magnetic layer with coercive force up to 000 Oersted,
FM with erasable magnetic head and recording density of 100 bpi
When the recording was done by the method, it was possible to record and reproduce normally. That is, it could be used as an ordinary magnetic card.
【００１６】実施例４ 第２の磁性層の塗料として以下の配合を調製したほかは
実施例３と同様にして、本発明の磁気記録媒体を作成し
た。 マンガンジンクフェライト １００重量部 （保磁力２０エルステッド 比表面積１０ｍ2 ／ｇ） 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 このようにして得た磁気原反から、ＪＩＳサイズの磁気
カードを打ち抜き実施例１と同様な評価を行ったとこ
ろ、実施例１と同様な結果を得た。又、この磁気カード
のトラックＴ以外の部分に３０００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１
００ｂｐｉ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。Example 4 A magnetic recording medium of the present invention was prepared in the same manner as in Example 3 except that the following formulation was prepared as the coating material for the second magnetic layer. Manganese zinc ferrite 100 parts by weight (coercive force 20 oersted specific surface area 10 m 2 / g) 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 From the magnetic raw material thus obtained, a JIS size magnetic card was punched out and evaluated in the same manner as in Example 1, and the same result as in Example 1 was obtained. . In addition, a magnetic head capable of recording and erasing on a magnetic layer having a coercive force of up to 3000 Oersted in a portion other than the track T of this magnetic card.
When recording was performed by the FM system at a recording density of 00 bpi, normal recording and reproduction could be performed. That is, it could be used as an ordinary magnetic card.
【００１７】[0017]
【発明の効果】本発明による磁気記録媒体は、後で追加
したり消去したりできない判定情報を磁性塗料塗布時に
いれることができる。この方法により製造されたカード
は 個々のカードに固有の判定情報を付与することがで
きるため、きわめて偽造、不正使用が困難である。また
製造設備も通常の磁気記録媒体の製造設備に簡単な磁気
記録装置を追加するだけであり、特殊な技術も必要ない
ため、生産性も高い。In the magnetic recording medium according to the present invention, judgment information that cannot be added or erased later can be added when the magnetic paint is applied. Cards manufactured by this method can be given unique judgment information to each card, making it extremely difficult for counterfeiting and unauthorized use. Further, the manufacturing facility is high in productivity because it is only necessary to add a simple magnetic recording device to the conventional magnetic recording medium manufacturing facility and no special technique is required.
【図面の簡単な説明】[Brief description of drawings]
【図１】（イ）は本発明の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（ロ）の第１の磁性層と第２の磁性層との
状態を拡大した断面図FIG. 1A is a plan view of a magnetic recording medium of the present invention. FIG. 1B is a magnetic state diagram after magnetization in the cross-sectional view taken along line XX in FIG. 1A. ) An enlarged cross-sectional view of the state of the first magnetic layer and the second magnetic layer of FIG.
【図２】第１の磁性層の塗布工程図FIG. 2 is a coating process diagram 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 非磁性層からなる基体 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の磁性層用の塗料の塗布装置 １３ 塗工ヘッド部 １４ ロール １５ 磁場配向装置 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の磁性層用の塗料の塗布装置 ２２ 塗工ヘッド部 ２３ ロール ２４ 乾燥パート ２５ ロール ２６ 巻取りリール T track 1 substrate made of non-magnetic layer 2 first magnetic layer 3 second magnetic layer 11 delivery reel 12 coating device for coating material for first magnetic layer 13 coating head part 14 roll 15 magnetic field aligning device 16 drying part 17 rolls 18 take-up reel 19 feed-out reel 20 magnetic head 21 coating device for paint for second magnetic layer 22 coating head part 23 roll 24 drying part 25 roll 26 take-up reel
Claims (2)
ステッド〜４０００エルステッドの保磁力の磁性体から
なる第１の磁性層と、０．５エルステッド〜１００エル
ステッドの低保磁力の磁性体からなり、後で追加も消去
も不可能な情報が記録されてなる第２の磁性層を順次積
層したことを特徴とする磁気記録媒体。1. A first magnetic layer made of a magnetic material having a coercive force of 250 oersted to 4000 oersteds and a magnetic material having a low coercive force of 0.5 oersteds to 100 oersted on a substrate made of a non-magnetic material. A magnetic recording medium characterized in that a second magnetic layer on which information that cannot be added or erased later is recorded is sequentially laminated.
ステッド〜４０００エルステッド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、０．５エルステッド〜１００エルステッドの低保磁
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。2. A first magnetic layer is formed by applying a magnetic coating material made of a magnetic material having a coercive force of 250 oersted to 4000 oersted on a substrate made of a non-magnetic material and drying the same, and then forming the first magnetic layer on the magnetic layer. A magnetic recording medium is characterized in that magnetic recording is carried out, and then a magnetic coating composed of a magnetic material having a low coercive force of 0.5 Oersted to 100 Oersted is applied and dried to form a second magnetic layer. Production method.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4150086A JPH0729156A (en) | 1992-05-19 | 1992-05-19 | Magnetic recording medium and manufacturing method thereof |
| JP4175930A JP2649756B2 (en) | 1992-05-19 | 1992-06-11 | Magnetic recording medium and method of manufacturing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4150086A JPH0729156A (en) | 1992-05-19 | 1992-05-19 | Magnetic recording medium and manufacturing method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0729156A true JPH0729156A (en) | 1995-01-31 |
Family
ID=15489211
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4150086A Pending JPH0729156A (en) | 1992-05-19 | 1992-05-19 | Magnetic recording medium and manufacturing method thereof |
| JP4175930A Expired - Fee Related JP2649756B2 (en) | 1992-05-19 | 1992-06-11 | Magnetic recording medium and method of manufacturing the same |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4175930A Expired - Fee Related JP2649756B2 (en) | 1992-05-19 | 1992-06-11 | Magnetic recording medium and method of manufacturing the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (2) | JPH0729156A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100324252B1 (en) * | 1998-06-24 | 2002-02-25 | 호소이 쇼지로 | A magnetic recording media and a reproducing method for an information fixed on the magnetic recording media |
-
1992
- 1992-05-19 JP JP4150086A patent/JPH0729156A/en active Pending
- 1992-06-11 JP JP4175930A patent/JP2649756B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100324252B1 (en) * | 1998-06-24 | 2002-02-25 | 호소이 쇼지로 | A magnetic recording media and a reproducing method for an information fixed on the magnetic recording media |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0729157A (en) | 1995-01-31 |
| JP2649756B2 (en) | 1997-09-03 |
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