JPH07107738B2 - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPH07107738B2 JPH07107738B2 JP61279629A JP27962986A JPH07107738B2 JP H07107738 B2 JPH07107738 B2 JP H07107738B2 JP 61279629 A JP61279629 A JP 61279629A JP 27962986 A JP27962986 A JP 27962986A JP H07107738 B2 JPH07107738 B2 JP H07107738B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- coercive force
- pattern
- recording medium
- magnetic recording
- 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 - Lifetime
Links
Landscapes
- 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] 本発明は磁気記録媒体に係り、特にセキュリティ性の向
上に関する。The present invention relates to a magnetic recording medium, and more particularly to improving security.
本発明は、不正使用防止機能および偽造改ざん防止機能
を必要とする磁気記録媒体、例えば磁気カード等に適用
される。INDUSTRIAL APPLICABILITY The present invention is applied to a magnetic recording medium that requires an unauthorized use prevention function and a forgery / tampering prevention function, such as a magnetic card.
[従来技術] 従来より、磁気カードの一部に真偽判定用の符号を形成
し、その符合を磁気ヘッドで読取ることで真偽の判定を
行い、カードのセキュリティを向上させるという方法が
採用されている。[Prior Art] Conventionally, a method of forming a code for authenticity determination on a part of a magnetic card and reading the code with a magnetic head to determine the authenticity and improving the security of the card has been adopted. ing.
従来の磁気カードでは、このような真偽判定用符合が磁
気印刷パターンと非磁性のダミー印刷パターンとで形成
され、符号が容易に判読されないように工夫されてい
る。磁気印刷パターンの材料としては、マグネタイト
(Fe3O4)やマグヘマイト(γ−Fe2O3)等の高保磁力材
料が使用されている。In a conventional magnetic card, such a code for authenticity determination is formed by a magnetic print pattern and a non-magnetic dummy print pattern, and is devised so that the code cannot be easily read. As a material for the magnetic printing pattern, a high coercive force material such as magnetite (Fe 3 O 4 ) or maghemite (γ-Fe 2 O 3 ) is used.
[発明が解決しようとする問題点] しかしながら、上記従来の磁気記録媒体では、真偽判定
用符合を読取るために外部磁界をかけると、磁気印刷パ
ターンに残留磁化を生じ、市販されているマグネティッ
クビュアーを用いれば真偽判定用符号の目視が可能にな
るという問題点を有していた。[Problems to be Solved by the Invention] However, in the above-described conventional magnetic recording medium, when an external magnetic field is applied to read the authenticity determination code, residual magnetization occurs in the magnetic printing pattern, and a commercially available magnetic viewer is used. However, there is a problem that the authenticity determination code can be visually observed by using.
この問題点を解決しようとすれば、読取り等によって外
部磁界をかけた後で毎回消磁する必要があり、システム
の複雑化を招く。In order to solve this problem, it is necessary to degauss each time after applying an external magnetic field by reading or the like, which causes the system to be complicated.
本発明は上記従来の問題点を解決しようとするものであ
り、その目的は簡単な構成でセキュリティの高い磁気記
録媒体を提供することにある。The present invention is intended to solve the above conventional problems, and an object thereof is to provide a magnetic recording medium having a simple structure and high security.
[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、少なくとも高保磁力パタ
ーと低保磁力パターンとが情報に対応して組み合わされ
ており、前記低保磁力パターンは残留磁化が生じないも
のであることを特徴とする。[Means for Solving Problems] In the magnetic recording medium according to the present invention, at least a high coercive force pattern and a low coercive force pattern are combined corresponding to information, and the low coercive force pattern does not cause remanence. It is characterized by being a thing.
[作用] 上記高保磁力パターンとは残留磁化が生じ得るパターン
であり、低保磁力パターンとは残留磁化が生じないパタ
ーンをいう。[Function] The high coercive force pattern is a pattern in which remanent magnetization can occur, and the low coercive force pattern is a pattern in which remanent magnetization does not occur.
このような構成では、情報の読取りのために外部磁界を
かけても、残留磁化が生じるのは高保磁力パターンだけ
である。そのために、例えば真偽判定用符号等の情報を
マグネットビュアー等で判読しようとしても、低保磁力
パターンを検出することができない。したがって、消磁
という特別な処理をしなくとも、極めて簡単な構成でセ
キュリティを高めることができる。In such a configuration, even when an external magnetic field is applied to read information, residual magnetization occurs only in the high coercive force pattern. Therefore, even if the information such as the authenticity determination code is read by a magnet viewer or the like, the low coercive force pattern cannot be detected. Therefore, the security can be enhanced with an extremely simple configuration without performing a special process such as degaussing.
[実施例] 以下、本発明の実施例を図面を参照しながら詳細に説明
する。Embodiments Embodiments of the present invention will be described in detail below with reference to the drawings.
第1図は、本発明による磁気記録媒体の一実施例の模式
的断面図である。FIG. 1 is a schematic sectional view of an embodiment of a magnetic recording medium according to the present invention.
同図において、カード上の基材1上には、高保磁力材料
の印刷パターン2、低保磁力材料の印刷パターン3およ
び非磁性材料のダミー印刷パターン4が記録内容に対応
した組み合わせで配列されている。In the figure, a print pattern 2 of a high coercive force material, a print pattern 3 of a low coercive force material, and a dummy print pattern 4 of a non-magnetic material are arranged in a combination corresponding to the recorded contents on a base material 1 on a card. There is.
高保磁力材料としては、BaFe12O19,γ−Fe2O3,Co−γ−
Fe2O3,Fe3O4等がある。低保磁力材料としては、Fe,セン
ダスト合金,Mn−Znフェライト,Ni−Znフェライト,Cu−Z
nフェライト等がある。As a high coercive force material, BaFe 12 O 19 , γ−Fe 2 O 3 , Co−γ−
Fe 2 O 3 , Fe 3 O 4 and the like. Low coercive force materials include Fe, Sendust alloy, Mn-Zn ferrite, Ni-Zn ferrite, Cu-Z
There are ferrites, etc.
また、基材1は、紙、合成樹脂フィルム等であり、表面
に磁気記録層を形成したものでもよい。The base material 1 is paper, synthetic resin film, or the like, and may have a magnetic recording layer formed on the surface.
第2図は、本実施例の読取り方法の説明図である まず、本実施例のカードが読取り装置に挿入されると矢
印A方向に搬送され、磁気ヘッド5によって情報が読取
られる。FIG. 2 is an explanatory diagram of the reading method of the present embodiment. First, when the card of the present embodiment is inserted into the reading device, it is conveyed in the direction of arrow A, and information is read by the magnetic head 5.
情報の読取りは次のように行われる。まず、磁気ヘッド
5には直流電流によって一定の磁束を発生させる。そし
てカードを矢印A方向に搬送し、磁気ヘッド5によって
カードの磁気パターンを走査させる。The reading of information is performed as follows. First, a constant magnetic flux is generated in the magnetic head 5 by a direct current. Then, the card is conveyed in the direction of arrow A, and the magnetic pattern of the card is scanned by the magnetic head 5.
磁気ヘッド5が高保磁力パターン2又は低保磁力パター
ン3上を通過すると、磁気ヘッド5は各磁気パターン2
又は3と磁気的なカップリングを起こし、磁束が変化し
てパターンの始端および終端で逆方向の電圧を発生す
る。一方、非磁性ダミーパターン4上では磁束に変化が
生じないために磁気ヘッド5に電圧は発生しない。When the magnetic head 5 passes over the high coercive force pattern 2 or the low coercive force pattern 3, the magnetic head 5 causes each magnetic pattern 2 to move.
Alternatively, magnetic coupling occurs with the magnetic flux 3, and the magnetic flux changes to generate reverse voltage at the beginning and end of the pattern. On the other hand, since the magnetic flux does not change on the non-magnetic dummy pattern 4, no voltage is generated in the magnetic head 5.
こうして第2図に示すように、磁気パターン2および3
が存在する時のみ、磁気ヘッド5から電圧が検出され、
したがって記録内容を読取ることができる。Thus, as shown in FIG. 2, magnetic patterns 2 and 3
Voltage is detected from the magnetic head 5 only when
Therefore, the recorded contents can be read.
第3図は、外部磁界をかけた後の本実施例の模式的断面
図である。FIG. 3 is a schematic cross-sectional view of this embodiment after applying an external magnetic field.
上記読取り走査は磁気ヘッド5に磁束を発生させて行う
ために、走査後には高保磁力パターン2だけに残留磁化
が存在している。したがって、読取り装置で情報が読取
られ、所望の処理が終了した後、装置から読出されたカ
ードは同図に示すような状態でユーザに所持される。Since the reading scan is performed by generating a magnetic flux in the magnetic head 5, residual magnetization exists only in the high coercive force pattern 2 after the scan. Therefore, after the information is read by the reading device and the desired processing is completed, the card read from the device is carried by the user in the state shown in FIG.
このようなカードは市販れているマグネットビュアーで
情報を判読することができない。なぜならば、マグネッ
トビュアーで検出できるのは残留磁化の存在するのは高
保磁力パターン2だけであり、高保磁力パターン2とと
もに情報を構成する低保磁力パターン3は検出すること
ができないからである。Such cards cannot be read by commercially available magnet viewers. This is because the magnet viewer can detect only the high coercive force pattern 2 in which the residual magnetization exists, and the low coercive force pattern 3 that constitutes information together with the high coercive force pattern 2 cannot be detected.
[発明の効果] 以上詳細に説明したように、本発明による磁気記録媒体
は、少なくとも2種類の磁気パターンで構成されている
ために、偽造が困難となる。また残留磁化が生じるのは
高保磁力パターンだけであるために、例えば真偽判定用
符号等の情報をマグネットビュアー等で判断しようとし
ても、低保磁力パターンを検出することができず、結果
的に情報を判断することができない。したがって、消磁
という特別な処理をしなくとも、極めて簡単な構成でセ
キュリティを高めることができる。[Effects of the Invention] As described in detail above, since the magnetic recording medium according to the present invention is composed of at least two types of magnetic patterns, it is difficult to forge. In addition, since remanent magnetization occurs only in a high coercive force pattern, even if an attempt is made to determine information such as a genuine / counterfeit determination code with a magnet viewer, a low coercive force pattern cannot be detected, and as a result, Information cannot be judged. Therefore, the security can be enhanced with an extremely simple configuration without performing a special process such as degaussing.
第1図は、本発明による磁気記録媒体の一実施例の模式
的断面図、 第2図は、本実施例の読取り方法の説明図、 第3図は、外部磁界をかけた後の本実施例の模式的断面
図である。 1……基材 2……高保磁力パターン 3……低保磁力パターン 4……非磁性ダミーパターン 5……磁気ヘッドFIG. 1 is a schematic sectional view of an embodiment of a magnetic recording medium according to the present invention, FIG. 2 is an explanatory view of a reading method of the present embodiment, and FIG. 3 is a present embodiment after applying an external magnetic field. It is a typical sectional view of an example. 1 ... Substrate 2 ... High coercive force pattern 3 ... Low coercive force pattern 4 ... Non-magnetic dummy pattern 5 ... Magnetic head
Claims (2)
ターンとが情報に対応して組み合わされており、前記低
保磁力パターンは残留磁化が生じないものであることを
特徴とする磁気記録媒体。1. A magnetic recording medium, wherein at least a high coercive force pattern and a low coercive force pattern are combined corresponding to information, and the low coercive force pattern does not cause remanent magnetization.
合金、Mn−Znフェライト、Ni−Znフェライト、およびCu
−Znフェライトからなる群から選ばれた磁性材料を含む
ことを特徴とする請求項1記載の磁気記録媒体。2. The low coercive force pattern comprises iron, sendust alloy, Mn-Zn ferrite, Ni-Zn ferrite, and Cu.
The magnetic recording medium according to claim 1, comprising a magnetic material selected from the group consisting of -Zn ferrite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61279629A JPH07107738B2 (en) | 1986-11-26 | 1986-11-26 | Magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61279629A JPH07107738B2 (en) | 1986-11-26 | 1986-11-26 | Magnetic recording medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63133321A JPS63133321A (en) | 1988-06-06 |
| JPH07107738B2 true JPH07107738B2 (en) | 1995-11-15 |
Family
ID=17613643
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61279629A Expired - Lifetime JPH07107738B2 (en) | 1986-11-26 | 1986-11-26 | Magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07107738B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4759568B2 (en) * | 2004-10-14 | 2011-08-31 | ギーゼッケ ウント デフリエント ゲーエムベーハー | Security element |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0322214A (en) * | 1989-06-20 | 1991-01-30 | Tomoegawa Paper Co Ltd | Magnetic recording medium |
| JPH04132018A (en) * | 1990-09-20 | 1992-05-06 | Csk Corp | Magnetic card |
| JP2005268655A (en) * | 2004-03-19 | 2005-09-29 | National Printing Bureau | Magnetic printed matter |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58101385A (en) * | 1981-12-10 | 1983-06-16 | Tdk Corp | Magnetic card not erasable |
| JPH0678037B2 (en) * | 1984-12-12 | 1994-10-05 | グローリー工業株式会社 | Authentication device for authentication identification medium |
-
1986
- 1986-11-26 JP JP61279629A patent/JPH07107738B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4759568B2 (en) * | 2004-10-14 | 2011-08-31 | ギーゼッケ ウント デフリエント ゲーエムベーハー | Security element |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63133321A (en) | 1988-06-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
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|
| R250 | Receipt of annual fees |
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|
| EXPY | Cancellation because of completion of term |