JPH02156416A - Magnetic card - Google Patents
Magnetic cardInfo
- Publication number
- JPH02156416A JPH02156416A JP30890288A JP30890288A JPH02156416A JP H02156416 A JPH02156416 A JP H02156416A JP 30890288 A JP30890288 A JP 30890288A JP 30890288 A JP30890288 A JP 30890288A JP H02156416 A JPH02156416 A JP H02156416A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- layer
- recording layer
- card
- soft 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.)
- Pending
Links
- 239000000758 substrate Substances 0.000 claims abstract description 5
- 229910003271 Ni-Fe Inorganic materials 0.000 claims abstract description 3
- 239000010409 thin film Substances 0.000 claims description 4
- 229910000599 Cr alloy Inorganic materials 0.000 claims description 2
- 239000000696 magnetic material Substances 0.000 claims description 2
- 238000004544 sputter deposition Methods 0.000 abstract description 6
- 229920001721 polyimide Polymers 0.000 abstract description 4
- 238000001514 detection method Methods 0.000 abstract 1
- 230000004907 flux Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 2
- 241000287828 Gallus gallus Species 0.000 description 1
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 210000000936 intestine Anatomy 0.000 description 1
- 239000006247 magnetic powder Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000123 paper Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
Landscapes
- Magnetic Record Carriers (AREA)
Abstract
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は磁気カードに関する。[Detailed description of the invention] [Industrial application field] The present invention relates to magnetic cards.
［従来の技術］
第４図に示すようにプラスチックや、紙、布等の非磁性
材料から成る基板としてのカード１１上の全面に、また
は第５図に示すようにストライブ状に磁性層１２を形成
した、いわゆる磁気カードは、キャッシュカードなどに
代表される金融・流通用途の他、磁気乗車券などの交通
分野、テレフォンカードなどの通信分野、ＩＤカードな
どの事務管理分野などさまざまな用途で使用されている
。[Prior Art] A magnetic layer 12 is formed on the entire surface of a card 11 as a substrate made of non-magnetic material such as plastic, paper, or cloth as shown in FIG. 4, or in a stripe shape as shown in FIG. The so-called magnetic cards, which have formed the It is used.
現在、これらの磁気カードの記録密度はその用途により
、２５〜２１０ ［ＢＰＩ］で使用されているが、そら
に記録密度を高くすることで記憶容量を増やし、より多
くの機能や高度の機密保持性を持つカードシステムが検
討されている。Currently, the recording density of these magnetic cards is 25 to 210 [BPI] depending on the purpose, but by increasing the recording density, it is possible to increase the storage capacity, provide more functions, and maintain a high level of confidentiality. A card system with gender is being considered.
この高記憶容量磁気カードシステムの候補のひとつとし
て連続薄膜からなる垂直磁気記録媒体の応用がある。One of the candidates for this high storage capacity magnetic card system is the application of a perpendicular magnetic recording medium made of a continuous thin film.
すなわち、現在使用されているγ−Ｆ ｅ ２０ ｉ
＋（Ｃｏ）ｒ−Ｆ ｅ２０３ 、ＢａＯ・６Ｆ ｅ２０
３等の酸化物磁性粉のかわりに蒸着法などによって垂直
磁気異方性をもつ連続薄膜をカード上に形成するもので
あり、たとえば第６図に示すようなＣｏ−Ｃｒスパッタ
膜を使用した場合、従来にくらべ数十〜数百倍の記録密
度を持つ磁気カードが得られている。That is, the currently used γ-F e 20 i
+(Co)r-F e203, BaO・6F e20
A continuous thin film with perpendicular magnetic anisotropy is formed on the card by vapor deposition method instead of oxide magnetic powder such as No. 3. For example, when a Co-Cr sputtered film as shown in Fig. 6 is used. , magnetic cards with recording densities several tens to hundreds of times higher than conventional magnetic cards have been obtained.
［発明が解決しようとする課題］
しかしながら、従来の第６図に示すように磁性層が露出
している構造では、外部環境の磁界により記録内容が消
失する危険性があり、また、記録内容が容易に検出でき
、機密の保持、偽造への安全性に問題がある。[Problems to be Solved by the Invention] However, in the conventional structure in which the magnetic layer is exposed as shown in FIG. It can be easily detected, and there are problems with confidentiality and security against forgery.
本発明はこれらの問題を解決し、信頼性および機密性の
高い高記憶容量磁気カードを提供することを課題とする
。It is an object of the present invention to solve these problems and provide a high storage capacity magnetic card with high reliability and confidentiality.
［課題を解決するための手段］
本発明は、非磁性材料からなる基板上にＣｏ−Ｃｒ合金
からなる垂直磁気記録層を形成した磁気カードにおいて
、前記垂直磁気記録層の上にＮｉＦｅ薄膜からなる軟磁
性層を形成したことを特徴とする。[Means for Solving the Problems] The present invention provides a magnetic card in which a perpendicular magnetic recording layer made of a Co-Cr alloy is formed on a substrate made of a nonmagnetic material, in which a NiFe thin film is formed on the perpendicular magnetic recording layer. It is characterized by forming a soft magnetic layer.
［作 用コ
垂直磁気記録層から出る磁力線は、その大部分が軟磁性
層中を通り垂直磁気記録層に戻り外部へ漏れる磁力線が
減少する。また、外部環境中の磁界に対して軟磁性層が
磁気シールドの役目をする。[Function] Most of the magnetic lines of force coming out of the perpendicular magnetic recording layer pass through the soft magnetic layer and return to the perpendicular magnetic recording layer, reducing the number of lines of magnetic force leaking to the outside. Furthermore, the soft magnetic layer serves as a magnetic shield against magnetic fields in the external environment.
［実施例］ 以下に図面を参照して本発明の詳細な説明する。[Example] The present invention will be described in detail below with reference to the drawings.
第１図に本発明の一実施例の構造を示す。本実施例は、
基板であるポリイミドフィルム１上にＣｏ−Ｃｒからな
る垂直磁気記録層２がスパッタ法により形成されている
。そして垂直磁気記録層２の上にはＮｉ−Ｆｅからなる
軟磁性層３が同じくスパッタ法により形成されている。FIG. 1 shows the structure of an embodiment of the present invention. In this example,
A perpendicular magnetic recording layer 2 made of Co--Cr is formed on a polyimide film 1 serving as a substrate by sputtering. A soft magnetic layer 3 made of Ni--Fe is also formed on the perpendicular magnetic recording layer 2 by sputtering.
このような構造にすることによって、第２図に示すよう
に垂直磁気記録層２から出る磁力線はその一部を除き、
大部分が軟磁性層３中を通り垂直記録層２に戻る。その
結果、記録された情報の正確な検出は磁気ヘッドを使用
して再生しない限り困難になり、情報の機密性が保たれ
、偽造等に対する安全性が確保できる。また、外部環境
中の磁界に対し、軟磁性層３が磁気シールドの役目をし
、垂直記録層２の情報を保護する。With this structure, as shown in FIG. 2, the lines of magnetic force coming out of the perpendicular magnetic recording layer 2, except for some of them,
Most of it passes through the soft magnetic layer 3 and returns to the perpendicular recording layer 2. As a result, it is difficult to accurately detect recorded information unless it is reproduced using a magnetic head, and the confidentiality of information is maintained and safety against forgery and the like can be ensured. Furthermore, the soft magnetic layer 3 serves as a magnetic shield against magnetic fields in the external environment, and protects the information in the perpendicular recording layer 2.
本発明の磁気カードの耐環境性向上効果を明らかにする
ため、従来の磁気カードと、本発明の磁気カードの再生
出力の測定を行なった。In order to clarify the effect of improving the environmental resistance of the magnetic card of the present invention, the reproduction outputs of a conventional magnetic card and a magnetic card of the present invention were measured.
従来の磁気カードは、厚さ２００μ偲のポリイミドフィ
ルム上にＣｏ−Ｃｒからなる垂直磁気記録層をスパッタ
法により抗磁力３０００エルステツド、厚さ１μ■に形
成したものである。また、本発明の磁気カードは、従来
の磁気カードの垂直磁気記録層の上にＮｉ−Ｆｅからな
る軟磁性層をスパッタ法により形成したもので、軟磁性
層の厚さが０．１ μ讃、０．３ μ腸、０．５
μ―、０．７ μ−１０，９μｍ、１．５μｍ、２
．０μＩのものを７種作製した。A conventional magnetic card has a perpendicular magnetic recording layer made of Co--Cr formed by sputtering on a polyimide film having a thickness of 200 .mu.m and a coercive force of 3000 oersted and a thickness of 1 .mu.m. In addition, the magnetic card of the present invention has a soft magnetic layer made of Ni-Fe formed by sputtering on the perpendicular magnetic recording layer of a conventional magnetic card, and the thickness of the soft magnetic layer is 0.1 μm. , 0.3 μ intestine, 0.5
μ-, 0.7 μ-10,9 μm, 1.5 μm, 2
．． Seven types of 0μI were prepared.
上記従来の磁気カード１種を本発明の磁気カード７Ｐｉ
ｉにそれぞれリングヘッドを用いて５キロとットバーイ
ンチ（ＫＢＰＩ）の信号を記録した後、これらの磁気カ
ードを１００エルステツドの磁界中を通過させてから再
生出力を測定した。その結果を第３図に示す。ここで再
生出力は、軟磁性層の厚さを０．３μｍとしたときの値
を１．０とした相対値で表わしている。One type of conventional magnetic card described above can be replaced with the magnetic card 7Pi of the present invention.
After recording a signal of 5 kilometer per inch (KBPI) using a ring head on each of the magnetic cards, these magnetic cards were passed through a magnetic field of 100 oersteds, and the reproduction output was measured. The results are shown in FIG. Here, the reproduction output is expressed as a relative value, with a value of 1.0 when the thickness of the soft magnetic layer is 0.3 μm.
図に示すように、軟磁性層の厚さを０．３〜０．４μ層
にしたときが最も再生出力が大きく、それより薄くなる
ほど、また厚くなるほど再生出力は低くなる。As shown in the figure, the reproduction output is highest when the thickness of the soft magnetic layer is 0.3 to 0.4μ, and the reproduction output decreases as the soft magnetic layer becomes thinner or thicker.
軟磁性層が薄い場合は、磁気カードに信号が飽和記録さ
れた後、磁界中を通過させたときに外部磁界の影響を受
けたと考えられる。また軟磁性層が厚い場合は、信号を
記録するときに、スペーシングロスにより未飽和記録と
なったと考えられる。If the soft magnetic layer is thin, it is considered that the magnetic card was influenced by an external magnetic field when the card was passed through a magnetic field after a signal was recorded in saturation. Furthermore, if the soft magnetic layer is thick, it is considered that unsaturated recording occurs due to spacing loss when recording signals.
実際に磁気カードとして使用する場合を考えると、軟磁
性層の厚さを０．１−０．０μｍにすれば、信頼性およ
び機密性の高い高記憶容量磁気カードが得られる。Considering the case where the card is actually used as a magnetic card, if the thickness of the soft magnetic layer is set to 0.1 to 0.0 μm, a magnetic card with high storage capacity and high reliability and security can be obtained.
［本発明の効果］
本発明によれば、垂直磁気記録層の上に軟磁性層を設け
たことで、ｆ≦頼性が高く、機密性の高い磁気カードが
得られる。[Effects of the Present Invention] According to the present invention, by providing a soft magnetic layer on the perpendicular magnetic recording layer, a magnetic card with high reliability and high confidentiality can be obtained.
第１図は本発明に係る磁気カードの構造を示す斜視図、
第２図は第１図の磁気カードの断面概略図、第３図は磁
気カードの軟磁性層と再生出力の関係を表わすグラフ、
第４図〜第６図は従来の磁気カードの構造を示す斜視図
である。
１・・・ポリイミドフィルム、２・・・垂直磁気記録層
、３・・・軟磁性層、４・・・磁力線の一部、５・・・
磁力性の大部分、１１・・・カード、１２・・・磁性層
。
第３図
軟ｇｉ＋′！渭膜の厚さ〔Ｐ鶏〕
第１図
第２図FIG. 1 is a perspective view showing the structure of a magnetic card according to the present invention;
FIG. 2 is a schematic cross-sectional view of the magnetic card shown in FIG. 1, and FIG. 3 is a graph showing the relationship between the soft magnetic layer of the magnetic card and the reproduction output.
4 to 6 are perspective views showing the structure of a conventional magnetic card. DESCRIPTION OF SYMBOLS 1... Polyimide film, 2... Perpendicular magnetic recording layer, 3... Soft magnetic layer, 4... Part of magnetic field lines, 5...
Majority of magnetic properties, 11...Card, 12...Magnetic layer. Figure 3 Soft gi+'! Thickness of the membrane [P chicken] Figure 1 Figure 2
Claims (1)
る垂直磁気記録層を形成した磁気カードにおいて、前記
垂直磁気記録層の上にＮｉ−Ｆｅ薄膜からなる軟磁性層
を形成したことを特徴とする磁気カード。1. A magnetic card in which a perpendicular magnetic recording layer made of a Co-Cr alloy is formed on a substrate made of a non-magnetic material, characterized in that a soft magnetic layer made of a Ni-Fe thin film is formed on the perpendicular magnetic recording layer. magnetic card.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30890288A JPH02156416A (en) | 1988-12-08 | 1988-12-08 | Magnetic card |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30890288A JPH02156416A (en) | 1988-12-08 | 1988-12-08 | Magnetic card |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02156416A true JPH02156416A (en) | 1990-06-15 |
Family
ID=17986643
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30890288A Pending JPH02156416A (en) | 1988-12-08 | 1988-12-08 | Magnetic card |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02156416A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003513392A (en) * | 1999-10-23 | 2003-04-08 | ウルトラカード，アイエヌシー． | Data storage device, apparatus and use thereof |
| US9430727B2 (en) | 1999-10-23 | 2016-08-30 | Ultracard, Inc. | Data storage device, apparatus and method for using same |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5651136B2 (en) * | 1975-02-28 | 1981-12-03 |
-
1988
- 1988-12-08 JP JP30890288A patent/JPH02156416A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5651136B2 (en) * | 1975-02-28 | 1981-12-03 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003513392A (en) * | 1999-10-23 | 2003-04-08 | ウルトラカード，アイエヌシー． | Data storage device, apparatus and use thereof |
| US9430727B2 (en) | 1999-10-23 | 2016-08-30 | Ultracard, Inc. | Data storage device, apparatus and method for using same |
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