JPH0799577B2 - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPH0799577B2 JPH0799577B2 JP60193393A JP19339385A JPH0799577B2 JP H0799577 B2 JPH0799577 B2 JP H0799577B2 JP 60193393 A JP60193393 A JP 60193393A JP 19339385 A JP19339385 A JP 19339385A JP H0799577 B2 JPH0799577 B2 JP H0799577B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic recording
- layer
- weight
- parts
- magnetic
- 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
Landscapes
- Credit Cards Or The Like (AREA)
- Paints Or Removers (AREA)
- Magnetic Record Carriers (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明は、磁気定期券、回数券、IDカード、又はクレジ
ットカードなどに使用する磁気記録媒体に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording medium used for a magnetic commuter pass, coupon, ID card, credit card, or the like.
従来の技術 プラスチック又は紙などの非磁性基体の表面に磁気記録
層を設けた磁気カードは、磁気定期券、回数券又はクレ
ジットカードなどの用途に広く使われている。2. Description of the Related Art A magnetic card provided with a magnetic recording layer on the surface of a non-magnetic substrate such as plastic or paper is widely used for applications such as a magnetic commuter pass, coupon ticket, or credit card.
これらの磁気カードは、磁気記録層部以外の基体表面の
余白部分又は裏面に文字、符号、図形などの印刷が施さ
れている。ところが磁気記録層の部分を拡げると、文
字、符号、図形などを印刷する面積が減少する。又その
逆の場合は、磁気記録可能な部分が減少するという問題
がある。In these magnetic cards, printing of characters, codes, figures, etc. is performed on the marginal portion or the back surface of the substrate surface other than the magnetic recording layer portion. However, when the magnetic recording layer is expanded, the area for printing characters, codes, figures, etc. is reduced. In the opposite case, there is a problem that the magnetically recordable area is reduced.
このような問題を解決するため、従来、添付図面の部分
拡大断面図に示すように、基体１に形成した磁気記録層
２の上に白色層５を設け、その上に、文字、符号、図形
などをオフセット、グラビア又は凸版など通常の印刷方
式で印刷し（又は白色層５を設けずに、磁気記録層２の
上に直接に印刷することもあった）、さらにその上に保
護ニス層６を設けた磁気カードが提案され、使用されて
いる。第４図において、参照番号４は、印刷によって付
与された印刷インキを示している。In order to solve such a problem, conventionally, as shown in a partially enlarged sectional view of the accompanying drawings, a white layer 5 is provided on a magnetic recording layer 2 formed on a substrate 1, and a character, a code, and a graphic are provided thereon. Is printed by a normal printing method such as offset, gravure or letterpress (or it may be printed directly on the magnetic recording layer 2 without providing the white layer 5), and the protective varnish layer 6 is further formed thereon. A magnetic card provided with is proposed and used. In FIG. 4, reference numeral 4 indicates a printing ink applied by printing.
発明が解決しようとする問題点 しかしながら、前述のような従来の磁気カードの如く、
磁気記録層２上に設けた通常の白色層５上又は磁気記録
層２上に直接に印刷したのでは、そこに付与された印刷
インキ層４は、第４図に誇張して示されるように、白色
層５（又は磁気記録層２）上に凸状に形成されてしま
う。従って、このような磁気カードの磁気記録層２に情
報を記録し再生を行なう場合の磁気記録層表面と磁気ヘ
ッドとの間にギャップ部の分離による信号出力の損失
（スペースロス）は、磁気記録層２上の場所によって凸
状の印刷インキ４が有ったり無かったりし、また、その
凸状の印刷インキ４の厚みに大小があるため、磁気記録
層２上の場所によって変動してしまうことになる。これ
が信号ジッターや出力レベルの変動の原因となり、記録
密度向上及び信頼性向上の妨げとなってしまっていた。
また、前述したような従来の構成では、文字、符号、図
形などを印刷した後に保護ニス６を施こす必要があるの
で、近年要求が増大している多品種少量の印刷の要求に
対しては、非常にコスト高となってしまうものであっ
た。Problems to be Solved by the Invention However, like the conventional magnetic card as described above,
When printing was performed directly on the ordinary white layer 5 provided on the magnetic recording layer 2 or on the magnetic recording layer 2, the printing ink layer 4 provided thereon was exaggerated as shown in FIG. However, it is formed in a convex shape on the white layer 5 (or the magnetic recording layer 2). Therefore, when recording and reproducing information on the magnetic recording layer 2 of such a magnetic card, the loss of signal output (space loss) due to the separation of the gap between the surface of the magnetic recording layer and the magnetic head is the magnetic recording. There may or may not be a convex printing ink 4 depending on the location on the layer 2, and the thickness of the convex printing ink 4 may be large or small, so that it varies depending on the location on the magnetic recording layer 2. become. This causes signal jitter and output level fluctuation, which hinders improvement in recording density and reliability.
Further, in the conventional configuration as described above, since it is necessary to apply the protective varnish 6 after printing characters, codes, figures, etc., it is possible to meet the increasing demand for printing a small amount of various products in recent years. The cost was very high.
本発明の目的は、前述したような従来の問題点を解消し
うる磁気記録媒体を提供することである。An object of the present invention is to provide a magnetic recording medium that can solve the above-mentioned conventional problems.
問題点を解決するための手段 本発明による磁気記録媒体は、非磁性基体に磁気記録層
を設け、該磁気記録層の上に直接的に重ねて、文字、符
号、図形等の印刷を施すための多孔質層を設け、該多孔
質層は、前記印刷を施したときに、印刷インキが充分に
浸透し、印刷インキが該多孔質層表面上に凸状とならな
い程度の多孔性を有しており、前記多孔質層は、塗布乾
燥したときに前記多孔性を与える塗料の塗膜からなるこ
とを特徴とする。Means for Solving the Problems In the magnetic recording medium according to the present invention, a magnetic recording layer is provided on a non-magnetic substrate, and a character, a code, a figure or the like is printed directly on the magnetic recording layer. Of the porous layer, and the porous layer has such a porosity that, when the printing is performed, the printing ink sufficiently penetrates and the printing ink does not become convex on the surface of the porous layer. The porous layer is composed of a coating film of a paint that gives the porosity when applied and dried.
実施例 次に、添付図面の第１図、第２図及び第３図に基づいて
本発明の実施例について本発明をより詳細に説明する。Embodiments Next, the present invention will be described in more detail with reference to FIGS. 1, 2 and 3 of the accompanying drawings.
第１図は、本発明の一実施例を示す磁気記録媒体の断面
図である。基体１の上に磁気記録層２を設け、さらにそ
の上に多孔質層３を設けたものである。FIG. 1 is a sectional view of a magnetic recording medium showing an embodiment of the present invention. The magnetic recording layer 2 is provided on the substrate 1, and the porous layer 3 is further provided on the magnetic recording layer 2.
基体１には、ポリエチレンテレフタレート（PET）フィ
ルム、ポリ塩化ビニル（PVC）フィルム、などの合成樹
脂フィルム、又は上質紙、合成樹脂含浸紙などが使用さ
れる。磁気記録層２は、γ−Fe2O3、Fe3O4、Co被着γ−
Fe2O3、Baフェライトなどの酸化金属磁性粉、Fe、Fe−C
o合金などの金属磁性粉が合成樹脂バインダーに均一に
分散された形で使用される。For the substrate 1, a synthetic resin film such as a polyethylene terephthalate (PET) film or a polyvinyl chloride (PVC) film, high-quality paper, synthetic resin-impregnated paper, or the like is used. The magnetic recording layer 2 has γ-Fe 2 O 3 , Fe 3 O 4 and Co deposited γ-
Fe 2 O 3, metal oxide magnetic powder such as Ba ferrite, Fe, Fe-C
o Metal magnetic powder such as alloy is used in the form that it is uniformly dispersed in the synthetic resin binder.
磁気記録のスペースロスを極力少なくするためには、多
孔質層３を薄く、好ましくは１〜５μｍの範囲とする必
要があり、又、文字、符号、図形等の印刷効果をより良
くするためには、磁気記録層２ができるだけ淡色である
ことが望ましい。このためには磁気記録層２のバインダ
ーの中に超微粉末シリカ及び酸化チタン（TiO2ルチル
型）を添加することにより実現できる。In order to reduce the space loss of magnetic recording as much as possible, it is necessary to make the porous layer 3 thin, preferably in the range of 1 to 5 μm, and to improve the printing effect of characters, codes, figures, etc. It is desirable that the magnetic recording layer 2 be as light as possible. This can be realized by adding ultrafine powder silica and titanium oxide (TiO 2 rutile type) to the binder of the magnetic recording layer 2.
多孔質層３は、微粉末シリカ（湿式法シリカ）をフィラ
ーとする塗膜、又はニトロセルロースをバインダーとし
て炭酸カルシウムをフィラーとしたエマルジョン塗料等
がこの目的に適している。For the porous layer 3, a coating film using fine powder silica (wet process silica) as a filler, an emulsion paint using nitrocellulose as a binder and calcium carbonate as a filler, and the like are suitable for this purpose.
公称188μｍ厚のPETフィルム基体１の表面に、下記に示
す磁性塗料を乾燥時の厚さで約10μｍに均一に塗布し磁
気記録層２を得た。磁性塗料は、次のようにして得た。The magnetic coating shown below was uniformly applied to the surface of a PET film substrate 1 having a nominal thickness of 188 μm to a dry thickness of about 10 μm to obtain a magnetic recording layer 2. The magnetic paint was obtained as follows.
磁性酸化鉄γ−MR（チタン工業KK製） 20重量部 酸化チタンKR−380（チタン工業KK製） 1重量部 疏水性シリカアエロジルＲ−972（日本アエロジル） 1
重量部 メチルエチルケトン 3重量部 メチルイソブチルケトン 3重量部 トルオール 3重量部 以上の材料をニーダーにて30分間混合する。一方、下記
の組成のラッカーを作成し、前記ニーダーに加え30分間
混合する。Magnetic iron oxide γ-MR (manufactured by Titanium Industry KK) 20 parts by weight Titanium oxide KR-380 (manufactured by Titanium Industry KK) 1 part by weight Hydrophobic silica Aerosil R-972 (Japan Aerosil) 1
Parts by weight Methyl ethyl ketone 3 parts by weight Methyl isobutyl ketone 3 parts by weight Toluol 3 parts by weight The above materials are mixed with a kneader for 30 minutes. On the other hand, a lacquer having the following composition is prepared, added to the kneader and mixed for 30 minutes.
ポリウレタンラッカーＮ−3113樹脂分:20％）（日本ポ
リウレタン工業製） 15重量部 塩ピ系樹脂エスレックＡ（積水化学製） 3重量部 メチルエチルケトン 7重量部 メチルイソブチルケトン 7重量部 トルオール 7重量部 その後サンドミルに２回通して磁気塗料を得た。なお、
塗布時にはさらにイソシアネート硬化剤デュラネート
24A−100（旭化成工業製）１重量部を混合して塗布す
る。Polyurethane lacquer N-3113 resin content: 20%) (manufactured by Nippon Polyurethane Industry Co., Ltd.) 15 parts by weight Salt-based resin S-LEC A (manufactured by Sekisui Chemical) 3 parts by weight Methyl ethyl ketone 7 parts by weight Methyl isobutyl ketone 7 parts by weight Toluol 7 parts by weight Sand mill To obtain a magnetic paint. In addition,
Isocyanate curing agent duranate when applied
1 part by weight of 24A-100 (Asahi Kasei) is mixed and applied.
次に下記に示す組成の多孔質層用塗料（Ａ又はＢ）を調
整し、前記磁気記録層２の上に約３〜４μｍ（乾燥時）
の厚さになるように、バーコーターにより均一に塗布
し、多孔質層３を形成した。Next, a coating material (A or B) for the porous layer having the composition shown below was prepared, and was applied onto the magnetic recording layer 2 in an amount of about 3 to 4 μm (when dried)
To a uniform thickness by a bar coater to form a porous layer 3.
組成（Ａ） サイロイド244（富士デヴィソン化学製） 0.8 重量部 ポリウレタンラッカーN3113（日本ポリウレタン製） 1.
0 重量部 ニトロセルロースラッカーFM200（ダイセル製）（樹脂
製:25％） 3.2 重量部 ステアリン酸ブチル（滑剤） 0.05重量部 メチルエチルケトン 20 重量部 メチルイソブチルケトン 20 重量部 トルオール 20 重量部 硬化剤 デュラネート24A−100（旭化成工業製） 0.4 重量部 硬化促進剤 ジブチル錫ジラウレート 0.03重量部 の組成物を高速インペラー分散機30分均一に分散して多
孔質層用塗料を得た。Composition (A) Syloid 244 (Fuji Davison Chemical) 0.8 parts by weight Polyurethane lacquer N3113 (Nippon Polyurethane) 1.
0 parts by weight Nitrocellulose lacquer FM200 (made by Daicel) (resin: 25%) 3.2 parts by weight Butyl stearate (lubricant) 0.05 parts by weight Methyl ethyl ketone 20 parts by weight Methyl isobutyl ketone 20 parts by weight Toluol 20 parts by weight Curing agent Duranate 24A-100 (Asahi Chemical Industry Co., Ltd.) 0.4 part by weight A composition of a curing accelerator dibutyltin dilaurate 0.03 part by weight was uniformly dispersed for 30 minutes by a high-speed impeller disperser to obtain a coating for a porous layer.
組成（Ｂ） 硝化綿FQ−SS1/2（ダイセル製）イソプロピルアルコー
ル30％含有 17重量部 ポリウレタンラッカーN3113（日本ポリウレタン製） 15
重量部 メチルエチルケトン 15重量部 メチルイソブチルケトン 15重量部 トルオール 13重量部 の組成物を良く溶解させて硝化綿ラッカーを作った。さ
らに、 シラン処理炭酸カルシウムSL−101（KK白石中央研究所
製） 60重量部 硝化綿ラッカー 33重量部 の組成物をニーダーにて30分間混練した。さらに ニーダー混練物 93重量部 硝化綿ラッカー 42重量部 メチルエチルケトン 45重量部 メチルイソブチルケトン 45重量部 トリオール 47重量部 の組成物を高速インペラー分散機にて30分間混合分散さ
せ、続いて、 水 200重量部 を加え、さらに10分間混合、分散を続けることにより、
多孔質層用エマルジョン塗料を得た。上記多孔質層３の
上にグラビア印刷法によりカラー４色印刷を施こし所望
の大きさに打抜いて印刷ずみ磁気カードサンプルを得
た。このカードの印刷部分は、第２図に示すように、多
孔質層３上に付与された印刷インキ４は、多孔質層３に
浸透し、表面の凹凸は、ほとんど見受けられなかった。
この磁気カードサンプルに磁気エンコード（300FCIの記
録密度でMFM飽和記録）した後自動改札機（東芝製）に
繰返し1,000回通路させ、印刷表面状態及び再生出力波
形の観測を行なった。その結果、印刷表面状態の変化も
ほとんどなく、出力レベル変動も５％以下（従来のカラ
ー印刷品は、20％以上の出力変動がある）であることが
確認された。Composition (B) Nitrified cotton FQ-SS1 / 2 (manufactured by Daicel) Contains 30% isopropyl alcohol 17 parts by weight Polyurethane lacquer N3113 (manufactured by Nippon Polyurethane) 15
Parts by weight Methyl ethyl ketone 15 parts by weight Methyl isobutyl ketone 15 parts by weight Toluol 13 parts by weight The composition of 13 parts by weight was well dissolved to prepare a nitrified cotton lacquer. Further, the composition of 60 parts by weight of silane-treated calcium carbonate SL-101 (manufactured by KK Shiraishi Central Research Institute) and 33 parts by weight of nitrified cotton lacquer was kneaded for 30 minutes in a kneader. Kneader kneaded product 93 parts by weight Nitrified cotton lacquer 42 parts by weight Methyl ethyl ketone 45 parts by weight Methyl isobutyl ketone 45 parts by weight Triol 47 parts by weight The composition of 47 parts by weight is mixed and dispersed for 30 minutes by a high-speed impeller disperser, and then 200 parts by weight of water. By adding, mixing and dispersing for another 10 minutes,
An emulsion paint for the porous layer was obtained. Four-color color printing was performed on the porous layer 3 by a gravure printing method and punched into a desired size to obtain a printed magnetic card sample. In the printed portion of this card, as shown in FIG. 2, the printing ink 4 applied on the porous layer 3 penetrated into the porous layer 3 and surface irregularities were hardly seen.
This magnetic card sample was magnetically encoded (MFM saturated recording at a recording density of 300 FCI) and then repeatedly passed through an automatic ticket gate (manufactured by Toshiba) 1,000 times to observe the printed surface condition and the reproduction output waveform. As a result, it was confirmed that there was almost no change in the printing surface condition, and the output level fluctuation was 5% or less (the conventional color printed product has an output fluctuation of 20% or more).
第３図は、本発明の別の実施例の磁気記録媒体の断面図
である。この実施例の磁気記録媒体では、基材１上に形
成した磁気記録層２に対してツライチ加工を施して磁気
記録層２を基材１へ埋設してから、その上に、多孔質層
３を形成している。磁気記録層２、多孔質層３自体の形
成については、前述した具体例と同様でよいので、繰り
返し説明しない。FIG. 3 is a sectional view of a magnetic recording medium according to another embodiment of the present invention. In the magnetic recording medium of this embodiment, the magnetic recording layer 2 formed on the base material 1 is subjected to tritching to embed the magnetic recording layer 2 in the base material 1, and then the porous layer 3 is formed thereon. Is formed. The formation of the magnetic recording layer 2 and the porous layer 3 itself may be the same as in the above-described specific example, and will not be described repeatedly.
前述した実施例は、カード状磁気記録媒体に本発明を適
用した場合であったが、本発明は、これに限らず、シー
ト状、テープ状、ディスク状の磁気記録媒体に同様に適
用して効果のあるものである。In the above-described embodiment, the present invention is applied to a card-shaped magnetic recording medium, but the present invention is not limited to this, and is similarly applied to a sheet-shaped, tape-shaped, or disk-shaped magnetic recording medium. It is effective.
発明の効果 本発明は、非磁性の基体の表面に磁気記録層を設け、さ
らにその上に印刷のための多孔質層を設けた構成である
ため、データ等の磁気記録情報と文字、符号、図形等の
印刷とを基体の一つの面に重ねて記録できる。又、印刷
インキが、多孔質層内に浸透して印刷されるため、印刷
後の保護ニスコート処理が不要となり、印刷工程を最終
の工程とすることが可能となるため、多品種少量品の要
求に対しても低コストで対応が可能となる。さらに印刷
インキが表面に突出しないため、スペーシングロスはほ
ぼ同一となり、データ等の磁気記録に対して、ジッター
や出力レベル変動が著しく少なくなり、信頼性のある記
録再生が可能となる。さらに又媒体表面に捺印、署名な
ども容易に行えることから、用途の拡大が可能となる。EFFECTS OF THE INVENTION The present invention has a structure in which a magnetic recording layer is provided on the surface of a non-magnetic substrate, and a porous layer for printing is further provided on the surface, so magnetic recording information such as data and characters, codes, Printing such as graphics can be recorded by superposing it on one surface of the substrate. Also, since the printing ink penetrates into the porous layer and is printed, there is no need for a protective varnish coating process after printing, and the printing process can be the final process. It is possible to deal with the above at low cost. Further, since the printing ink does not protrude to the surface, the spacing loss is almost the same, and the jitter and the output level fluctuation are remarkably reduced with respect to the magnetic recording of data and the like, and reliable recording / reproducing becomes possible. Furthermore, since the marking and the signature can be easily performed on the medium surface, the application can be expanded.
第１図は本発明の一実施例の磁気記録媒体を示す部分拡
大断面図、第２図は第１図の磁気記録媒体の多孔質層上
に印刷した印刷インキの様子を示す部分拡大断面図、第
３図は本発明の別の実施例の磁気記録媒体を示す部分拡
大断面図、第４図は従来の磁気記録媒体の一例を示す部
分拡大断面図である。 １……基材、２……磁気記録層、 ３……多孔質層、４……印刷インキ。1 is a partially enlarged sectional view showing a magnetic recording medium according to an embodiment of the present invention, and FIG. 2 is a partially enlarged sectional view showing a state of printing ink printed on the porous layer of the magnetic recording medium shown in FIG. FIG. 3 is a partially enlarged sectional view showing a magnetic recording medium of another embodiment of the present invention, and FIG. 4 is a partially enlarged sectional view showing an example of a conventional magnetic recording medium. 1 ... Substrate, 2 ... Magnetic recording layer, 3 ... Porous layer, 4 ... Printing ink.
Claims (3)
録層の上に直接的に重ねて、文字、符号、図形等の印刷
を施すための多孔質層を設け、該多孔質層は、前記印刷
を施したときに、印刷インキが充分に浸透し、印刷イン
キが該多孔質層表面上に凸状とならない程度の多孔性を
有しており、前記多孔質層は、塗布乾燥したときに前記
多孔性を与える塗料の塗膜からなることを特徴とする磁
気記録媒体。1. A non-magnetic substrate is provided with a magnetic recording layer, the magnetic recording layer is directly superposed on the magnetic recording layer, and a porous layer for printing characters, codes, figures, etc. is provided on the magnetic recording layer. Has a porosity such that when the printing is performed, the printing ink sufficiently penetrates and the printing ink does not form a convex shape on the surface of the porous layer, and the porous layer is coated and dried. A magnetic recording medium comprising a coating film of a paint which gives the above-mentioned porosity.
である特許請求の範囲第（１）項記載の磁気記録媒体。2. The magnetic recording medium according to claim 1, wherein the thickness of the porous layer is in the range of 1 to 5 μm.
求の範囲第（１）項又は第（２）項記載の磁気記録媒
体。3. The magnetic recording medium according to claim 1, wherein the color of the magnetic recording layer is a light color.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60193393A JPH0799577B2 (en) | 1985-09-02 | 1985-09-02 | Magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60193393A JPH0799577B2 (en) | 1985-09-02 | 1985-09-02 | Magnetic recording medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6252719A JPS6252719A (en) | 1987-03-07 |
| JPH0799577B2 true JPH0799577B2 (en) | 1995-10-25 |
Family
ID=16307194
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60193393A Expired - Fee Related JPH0799577B2 (en) | 1985-09-02 | 1985-09-02 | Magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0799577B2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2628195B2 (en) * | 1988-08-05 | 1997-07-09 | アルプス電気株式会社 | Recording device |
| JPH08106632A (en) * | 1995-08-23 | 1996-04-23 | Tokin Corp | Production of magnetic card |
| JP4492463B2 (en) * | 2004-06-30 | 2010-06-30 | Ｄｉｃ株式会社 | Magnetic recording medium and method for manufacturing magnetic recording medium |
| JP4766301B2 (en) * | 2004-06-30 | 2011-09-07 | Ｄｉｃ株式会社 | A fluorescent pattern forming method on a recording material, an article on which a fluorescent pattern is formed using the method, and a transfer laminate. |
| JP4780378B2 (en) * | 2004-06-30 | 2011-09-28 | Ｄｉｃ株式会社 | Novel pattern forming method on magnetic recording medium, transfer laminate and magnetic recording medium used therefor |
| JP4779512B2 (en) * | 2004-08-31 | 2011-09-28 | Ｄｉｃ株式会社 | Concealment card and method for manufacturing the same |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4825441A (en) * | 1971-08-02 | 1973-04-03 | ||
| JPS58180070U (en) * | 1982-05-25 | 1983-12-01 | 共同印刷株式会社 | colored magnetic recording media |
-
1985
- 1985-09-02 JP JP60193393A patent/JPH0799577B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6252719A (en) | 1987-03-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR100232111B1 (en) | Magnetic recording medium and its manufacturing method | |
| JPH02285514A (en) | Magnetic card | |
| US5439755A (en) | Magnetic recording medium comprising a magnetic recording layer, an intermediate layer, a metallic thermal recording layer and a protective layer | |
| JPH0799577B2 (en) | Magnetic recording medium | |
| JPS5896592A (en) | Information recording card | |
| KR840005875A (en) | Magnetic recording media | |
| JP2759747B2 (en) | Magnetic recording medium and manufacturing method thereof | |
| JPH0337987Y2 (en) | ||
| JP2626858B2 (en) | Manufacturing method of magnetic recording medium | |
| JPH07121864A (en) | Magnetic recording medium and its production | |
| JP3238190B2 (en) | Magnetic card and method of manufacturing the same | |
| JPH0312545Y2 (en) | ||
| JP3616938B2 (en) | Magnetic display card | |
| JPH0380427A (en) | Thermosensitive magnetic recording medium | |
| JPS6319941Y2 (en) | ||
| JP2593362Y2 (en) | Thermal transfer recording medium | |
| JPH0825855A (en) | Magnetic card and manufacture thereof | |
| JP2649756B2 (en) | Magnetic recording medium and method of manufacturing the same | |
| JPS6294396A (en) | Information record medium | |
| JPH0760509B2 (en) | Magnetic recording medium | |
| JPH0544891Y2 (en) | ||
| JP2005190652A (en) | Magnetic recording medium | |
| JP2649765B2 (en) | Magnetic recording medium and method of manufacturing the same | |
| KR20010014276A (en) | A magnetic recording medium | |
| JPH0226287B2 (en) |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |