JPS6177102A - Magnetic recording medium and its truth or falsehood deciding method - Google Patents
Magnetic recording medium and its truth or falsehood deciding methodInfo
- Publication number
- JPS6177102A JPS6177102A JP19930584A JP19930584A JPS6177102A JP S6177102 A JPS6177102 A JP S6177102A JP 19930584 A JP19930584 A JP 19930584A JP 19930584 A JP19930584 A JP 19930584A JP S6177102 A JPS6177102 A JP S6177102A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic recording
- recording medium
- magnetic
- data
- track
- 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.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
- G11B20/00094—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which result in a restriction to authorised record carriers
- G11B20/00123—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which result in a restriction to authorised record carriers the record carrier being identified by recognising some of its unique characteristics, e.g. a unique defect pattern serving as a physical signature of the record carrier
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/18—Error detection or correction; Testing, e.g. of drop-outs
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Security & Cryptography (AREA)
- Magnetic Record Carriers (AREA)
- Recording Or Reproducing By Magnetic Means (AREA)
Abstract
Description
【発明の詳細な説明】
（イ）発明の目的
［産業上の利用分野］
この発明は磁気記録媒体の真偽判定方法及びそれに使用
する磁気記録媒体、特に磁気カード、磁気シート、ｌｉ
ｆ灸気通気通帳いは磁気定１９１券等に不正使用防止機
能及び偽造改ざん防止機能を持たせるための磁気記録媒
体の真偽判定方法及びそれに使用する磁気記録媒体に関
するものである。Detailed Description of the Invention (a) Purpose of the Invention [Field of Industrial Application] This invention relates to a method for determining the authenticity of a magnetic recording medium and a magnetic recording medium used therein, particularly a magnetic card, a magnetic sheet, and a magnetic recording medium.
The f-moxibustion ventilation passbook relates to a method for determining the authenticity of a magnetic recording medium and a magnetic recording medium used therein for providing a magnetic 191 note or the like with a function to prevent unauthorized use and a function to prevent forgery and tampering.
°磁気記録カード等は、強磁性金属酸化物等の磁性相別
をバインダーや溶剤と混合分散させてカード基材等の上
に塗布し、乾燥さ才て磁気記録媒体を構成し、カード状
やシート状にしたものであって、情報出込み装置の磁気
ヘッドによって、磁気記録媒体を磁化させて情報を書き
込み、また、情＋ｆ１＠取り装置の磁気ヘッドによって
磁気記録媒体の残留磁気を検出して、情報を読取るよう
に構成されている。°Magnetic recording cards, etc. are made by mixing and dispersing a magnetic phase such as a ferromagnetic metal oxide with a binder or solvent and coating it on a card base material etc., and then drying it to form a magnetic recording medium. It is made into a sheet, and information is written by magnetizing the magnetic recording medium with the magnetic head of the information output device, and the residual magnetism of the magnetic recording medium is detected by the magnetic head of the information +f1@ collecting device. , configured to read information.
このような磁気記録媒体を貯金通帳や定期券として使用
ザる場合に【、し、不正使用や偽造改ざんを防止する機
能を真えさせる必要がある。When such magnetic recording media are used as savings passbooks or commuter passes, they must be equipped with a function to prevent unauthorized use, forgery, and falsification.
［従来の技術］
この不正使用や偽造改ざんを防止する方法としては、従
来、磁気的透かしを磁気記録媒体に入れるものがある。[Prior Art] Conventionally, as a method for preventing unauthorized use and forgery and tampering, there has been a method of placing a magnetic watermark on a magnetic recording medium.
これは２４状磁性粉の磁化容易軸の配向方向を磁気ス１
〜ライブ等の磁気記録媒体面の長手方向（記録り向）に
対しで繰返し変化さけて目視不可の磁気パターンを付加
する方法である。This means that the orientation direction of the axis of easy magnetization of the 24-shaped magnetic powder is
~This is a method of adding an invisible magnetic pattern to the longitudinal direction (recording direction) of the surface of a magnetic recording medium, such as a live recording medium, while avoiding repeated changes.
［発明が解決しようとする問題点コ
しかるに、この磁気パターンは目視不可ではあるが、マ
グネティックテープピュアー（ｍａｇｎｅｔｉｃｔａｐ
ｅ ｖｉｅｗｅｒ）等によれば磁気的に検出して可視
状１１！に再現１−ることができ、またこのような磁気
パターンは磁気的に転写可能であるので、通常の記録方
式のものに比較すれば幾分、偽造、改ざんに困難性はあ
るものの、そのような磁気パターンの偽造、改ざんが不
可能ではなく、不正使用防止、偽造改ざん防止（幾重と
しては必ずしも十分ではない。しかも、ここで必要とさ
れる端末機は複雑化し、その保守も難しいという問題が
ある。[Problems to be solved by the invention]However, although this magnetic pattern is not visible to the naked eye, magnetic tape pure
e viewer) etc., it is detected magnetically and visible 11! Since such magnetic patterns can be magnetically transferred, they are somewhat more difficult to forge or falsify than those using normal recording methods. It is not impossible to forge or tamper with the magnetic pattern, but it is not always sufficient to prevent unauthorized use and counterfeiting.Furthermore, the terminal equipment required here has become complex and its maintenance is difficult. be.
この発明は上記の如き事情に鑑みてなされたものであっ
て、磁気記録媒体に真偽識別符号を入れたものにおいて
マグネティックテープピュアー等によ−〉で、真偽判定
用のデータが目視されることがなく、また、真偽判定用
の識別符号が磁気的に転写されることがなく、かつ磁気
記録媒体の真偽識別が容易かつ確実で、従って、磁気媒
体の偽造改ざんを容易かつ確実に防ぐことができる磁気
記録媒体の真偽判定方法と、及びそのような機能を侍も
、かつ製作が容易で汎用性が大きい磁気記録媒体を提供
することを目的とするものである。This invention was made in view of the above-mentioned circumstances, and in magnetic recording media with authenticity identification codes, data for authenticity determination can be visually observed using magnetic tape pure etc. In addition, the identification code for determining authenticity is not magnetically transferred, and the authenticity of the magnetic recording medium can be easily and reliably identified. Therefore, forgery and tampering of the magnetic medium can be easily and reliably prevented. The object of the present invention is to provide a method for determining the authenticity of a magnetic recording medium that can prevent the above-mentioned problems, and a magnetic recording medium that is easy to manufacture and has great versatility.
（ロ）発明の構成
［問題を解決するための手段］
この目的に対応して、この発明の磁気記録媒体の真偽判
定方法は、磁気記録及び再生がしにくい若しくは不可能
な領域を有する磁気記録媒体において、前記領域を含む
トラックに磁気記録を行ない、次に前記１−ラックにお
ける再生出力の有無、間隔、時間若しくは前記領域の四
故等のデータにより前記磁気記録媒体の真偽を判定し、
しかる後に必要に応じて前記磁気記録を消去Ｊ°ること
をνｊ徴としている。また、この発明の磁気記録媒体は
、データトラックどして使用されない磁気記録可能な領
域の一部分に磁気記録及び再生がしにくい若しくは不可
能な領域を設けてなることを特徴としている。(B) Structure of the Invention [Means for Solving the Problem] Corresponding to this objective, the method for determining the authenticity of a magnetic recording medium of the present invention provides a method for determining the authenticity of a magnetic recording medium of the present invention. In the recording medium, magnetic recording is performed on a track including the area, and then the authenticity of the magnetic recording medium is determined based on data such as the presence or absence of reproduction output in the 1-rack, the interval, the time, the reason for the area, etc. ,
After that, the magnetic recording is erased J° as required. Furthermore, the magnetic recording medium of the present invention is characterized in that a part of the magnetically recordable area that is not used as a data track is provided with an area in which magnetic recording and reproduction are difficult or impossible.
以下、この発明のｉＴ細を一実施例を示す図面に−）い
て説明する。Hereinafter, the iT details of this invention will be explained with reference to the drawings showing one embodiment.
第１図において１は遇気記８媒体であり、磁気記録媒体
１（、Ｌ強磁性黴属酸化物等の賛灸性材料をカード阜材
簀の表面上の全面に印刷簀によって塗イ■されて形成さ
れるものである。In Fig. 1, reference numeral 1 denotes a magnetic recording medium 1 (L), in which a moxibustion material such as ferromagnetic mold oxide is coated on the entire surface of the card storage using a printing screen. It is formed by
磁気記録媒体１には１本若しくは複数本のデータトラッ
ク２が設けられ、このデータトラック２は所持者の叫人
情＋１１ユカード発行名の情報等が記録される領域であ
る。以上の磁気記録媒体の構成は従来より知られている
ところである。The magnetic recording medium 1 is provided with one or more data tracks 2, and this data track 2 is an area in which information such as the holder's name and the name of the card issued is recorded. The configuration of the magnetic recording medium described above is conventionally known.
さて、データ１〜ラツク２の領域以外の磁気記録媒体１
の領域に真偽識別用の識別符号３を設ける。Now, magnetic recording medium 1 other than the data 1 to rack 2 areas
An identification code 3 for identifying authenticity is provided in the area.
識別符号３は、あたかもバーコードのように、真偽の判
定や種類の選定のデータとなり得る所定の形状若しくは
パターンをもって形成されるが、いずれの識別符号３も
後述するように、磁気記録媒体１の真偽を判定する際に
判定用の磁気ヘッドを通るトラック（ｔ１１定用トラッ
ク４）上に配置している。識別符号３及び判定用トラッ
ク４は第１図に示す実施例では２列準備されているが、
この列数は１列でもよく、また３列以上でもよい。The identification code 3 is formed with a predetermined shape or pattern that can serve as data for determining authenticity and selecting the type, just like a bar code. It is placed on the track (t11 regular track 4) that passes through the magnetic head for determination when determining the authenticity of the information. In the embodiment shown in FIG. 1, two rows of identification codes 3 and judgment tracks 4 are prepared.
The number of columns may be one, or three or more.
特に注目１べきことどして、この識別符号３は磁気記録
及び再生がしにくい若しくは不可能にしである。識別符
号３を磁気記録の書込み再生を不可能にする技術として
は、低抗磁力磁性体（高透磁′＄磁性体）を含むインキ
を使用して識別符号３を磁気記録媒体１上に印刷によっ
て形成し、従って識別符号３の部分においてだけ磁気記
録媒体１を低抗磁力磁性体で覆い、低抗磁力磁性体の磁
気シールドは能によって、その部分だけ磁気記録媒体１
を磁気記録及び再生をしにくい若しくは不可能にしても
よいし、また、同様の手段によりＪＬｒｔｌ性層を磁気
記録媒体１のヒに形成して磁気記録及び再生をしにくい
若しくは不可能にしてもよい。It is particularly noteworthy that this identification code 3 makes magnetic recording and reproduction difficult or impossible. A technique that makes it impossible to write and reproduce the identification code 3 on magnetic recording is to print the identification code 3 on the magnetic recording medium 1 using ink containing a low coercive force magnetic material (high permeability magnetic material). Therefore, the magnetic recording medium 1 is covered with a low coercive force magnetic material only in the part marked with the identification code 3, and the magnetic shield of the low coercive force magnetic material is formed by the magnetic recording medium 1 only in that part.
may be made difficult or impossible to magnetically record and reproduce, or a JLrtl layer may be formed on the side of the magnetic recording medium 1 by similar means to make magnetic recording and reproduction difficult or impossible. good.
また、パンチ穴を磁気記録媒体１の所定部分に形成りる
ことにより、磁気記録及び再生を不可能にする方法で代
用することもできる。ここで１由川し１’７る低抗１バ
カｌｌ１ｌ竹休どしｃは抗田ノＪが゛１５０Ｑｅ以下の
Ｎｉ −７ｎ 、Ｍｎ −Ｚｎ ｖグネタイ１〜等の軟
！１７丁ライトや軟質の金属等、軟質の磁性材料を使用
することができる。その１４合の識別符号３の厚みは、
磁気シールド効果を発揮し１！？る厚みとし、低抗磁力
磁性体の密度やＫｆ４に力や書込み磁界強度若しくは再
生磁界強度とのかね合いで決定され、６μであるが外部
から不可視状にするという観点からは薄い程好ましい。Alternatively, a method may be used in which punch holes are formed in predetermined portions of the magnetic recording medium 1 to make magnetic recording and reproduction impossible. Here, 1 Yukawa and 1'7 low resistance 1 baka ll 1 l bamboo rest c are the softness such as Ni -7n, Mn - Zn v Gunetai 1 ~ below 150 Qe! A soft magnetic material such as a 17-pin light or a soft metal can be used. The thickness of the 14th identification code 3 is:
Demonstrates magnetic shielding effect 1! ? The thickness is determined based on the density of the low coercive force magnetic material, the force Kf4, and the strength of the write magnetic field or the read magnetic field.The thickness is 6μ, but from the viewpoint of making it invisible from the outside, the thinner it is, the more preferable it is.
ｑ！磁気記録媒体及び識別符号３上には白色インキ等か
らなる隠蔽層を設け、識別符号３を隠蔽する。q! A concealing layer made of white ink or the like is provided on the magnetic recording medium and the identification code 3 to hide the identification code 3.
次に、上記の構成の磁気記録媒体を使用した磁気記録媒
体の真偽判定方法について説明する。Next, a method for determining authenticity of a magnetic recording medium using the magnetic recording medium configured as described above will be described.
まず、磁気カード等の発券時には第１図に示すように、
デーウドラック２にのみデータ５を記録しておく。First, when issuing magnetic cards, etc., as shown in Figure 1,
The data 5 is recorded only in the data rack 2.
次に磁気カード等の使用時であるが、このときに、磁気
カード等を端末機に入れると、データ５の再生、書換え
が行われると同時に、特に重要なこととして、記録ヘッ
ドによって判定用データトラック４に判定用のデータ６
が書込まれ、かつ、その後、直らにその判定用のデータ
が再生ヘッドによって再イトされ、判定用のデータが読
取られ、かつ、必要に応じて、その後直ちにその消去ヘ
ッドによって判定用のデータが消去される。この再生ヘ
ッドによる再生によって判定用データトラック４から再
生出力が得られるが、識別符号３には磁気シールド作用
等によって判定用データの書込みも、再生もされないの
で、この部分からは再出力が得られない。この判定用デ
ータトラック４の再生出力の有無の時間、間隔、個数等
からカードの種類の判別と共に、磁気記録媒体の真偽の
判定もすることができる。 最後に、端末機から磁気カ
ード等を取り出した時には、すでに判定用Ｆ −タトラ
ック４のデータ６を消去ヘッドによって消去して４メけ
ば、磁気カード等の発＃詩と同様に、マグネティックテ
ープビ］アーによっても判定用のデータは目視されない
ことになり、効果的である。この場合、消去時の消去ヘ
ッドの幅は識別符号３の幅よりも広いものとすることが
望ましく１、□□ ａｍ”ｒｉａｃ＋：ｔ、７゜。、
−０、’ｔ’ｌｔｍ−Ｆ−９、また、消去後のス１〜ラ
イブ状の消去パターン７がラック４上をｉｉ”ｒ人して
おき、端末はでの利用面と使用後の区別がつかないよう
にして４３＜。さらには、第３図に示すように、判定用
データトラック４の位置の他にも予め消去により消去パ
ターン７を形成しておくと、判定用データトラック４の
位置の判別を困難にすることができる。消去磁界が交流
磁界であれば、消去パターンの判別を一層困難にするこ
とができる。Next, when using a magnetic card, etc., at this time, when the magnetic card, etc. is inserted into the terminal, the data 5 is reproduced and rewritten, and at the same time, what is particularly important is that the recording head records the judgment data. Data 6 for judgment on track 4
is written, and then the judgment data is immediately re-written by the playback head, the judgment data is read, and if necessary, the judgment data is immediately written back by the erase head. will be deleted. A reproduction output is obtained from the judgment data track 4 by reproduction by this reproduction head, but since judgment data is neither written nor reproduced in the identification code 3 due to magnetic shielding, etc., no re-output can be obtained from this part. do not have. The type of card can be determined based on the time, interval, number, etc. of the reproduction output of the determination data track 4, and the authenticity of the magnetic recording medium can also be determined. Finally, when you take out the magnetic card etc. from the terminal, if you have already erased the data 6 on the judgment F-ta track 4 with the erasing head, the data 6 on the magnetic card etc. will be erased using the erase head. This is effective because the judgment data is not visually checked by the viewer. In this case, it is desirable that the width of the erasing head during erasing be wider than the width of the identification code 31, □□ am”riac+:t, 7°.
-0, 't'ltm-F-9, and the erase pattern 7 in the form of a live pattern is placed on the rack 4, and the terminal is distinguished from the usage side and the after use. Furthermore, as shown in FIG. 3, if an erase pattern 7 is formed in advance by erasing in addition to the position of the judgment data track 4, the position of the judgment data track 4 can be This can make it difficult to determine the position.If the erase magnetic field is an alternating magnetic field, it can make it even more difficult to determine the erase pattern.
（ハ）発明の効果
以上の構成の磁気記録媒体の真偽判定方法及び磁気記録
媒体においては、特に判定用のデータを消去しである場
合には、磁気カード等が利用者の手許にあるときには、
真偽判定用のデータは消去されていて、真偽判定用のデ
ータはマグネティックテープ上１アーによってｂ目視す
ることができない。また、識別符号は磁化されないので
、磁気的に転写することができず、結局、磁気的な転写
が可能なのはデータトラック２上のデータ５だけであり
、データ５のみの転写だ番ブＣは磁気記録媒体の偽造は
困難である。また判定用のデーターを消去しない場合で
あっても、識別符号を改ざんすることはきわめて困難で
ある。ざらに、真偽判定のための識別符号は印刷等によ
って形成することができ、磁気カード等の製造はきわめ
て容易である。しかｔ）識別符号は磁気記録媒体と同様
に印り１１等により隠蔽し、目視されないようにするこ
とが可能である。さらに、識別符号は任意に作成するこ
とができるので磁気記録媒体としては汎用性が大きくな
る。このようにしてこの発明によれば、真偽の判定が容
易かつ確実で、かつ、偽造、改ざんを確実に防ぐことが
できる磁気記録媒体の真偽判定方法と、そのような顆能
をちも、製作が容易で汎用性が大きい磁気記録媒体を１
ｑることができる。(c) In the magnetic recording medium authenticity determination method and magnetic recording medium having a structure that exceeds the effect of the invention, especially when the data for determination is erased, when the magnetic card etc. is in the user's hand. ,
The data for determining authenticity has been erased and cannot be visually checked by placing it on the magnetic tape. In addition, since the identification code is not magnetized, it cannot be magnetically transferred, and in the end, only data 5 on data track 2 can be magnetically transferred, and the number block C that only transfers data 5 is magnetically transferred. It is difficult to counterfeit recording media. Furthermore, even if the determination data is not deleted, it is extremely difficult to tamper with the identification code. Generally speaking, the identification code for determining authenticity can be formed by printing, etc., and manufacturing of magnetic cards and the like is extremely easy. However, t) the identification code can be hidden by a mark 11 or the like in the same way as a magnetic recording medium so that it cannot be seen visually. Furthermore, since the identification code can be created arbitrarily, the magnetic recording medium has greater versatility. In this way, the present invention provides a method for determining the authenticity of a magnetic recording medium, which allows easy and reliable determination of authenticity, and also reliably prevents forgery and falsification, and a method for determining the authenticity of a magnetic recording medium. , a magnetic recording medium that is easy to manufacture and has great versatility.
I can do it.
第１図は発行時の磁気記録媒体の状態を示す平面説明図
、第２図は端末（層内での磁気記録媒体の状態を示す平
面説明図、及び第３図は端末機から取り出した１、１の
磁気記録媒体の状態を示す平面説明図である。
１・・・磁気記録媒体 ２・・・データトラック３・
・・識別符号 ４・・・判定用データトラック５・・
−データ Ｇ・・・判定用データ ７・・・消去パ
ターンFig. 1 is an explanatory plan view showing the state of the magnetic recording medium at the time of issue, Fig. 2 is an explanatory plan view showing the state of the magnetic recording medium in the terminal (layer), and Fig. 3 is an explanatory plan view showing the state of the magnetic recording medium in the terminal (layer). , 1 is an explanatory plan view showing the state of the magnetic recording medium of 1. 1... Magnetic recording medium 2... Data track 3.
...Identification code 4...Judgment data track 5...
-Data G...Judgment data 7...Erase pattern
Claims (3)
域を有する磁気記録媒体において、前記領域を含むトラ
ックに磁気記録を行ない、次に前記トラックにおける再
生出力の有無、間隔、時間若しくは前記領域の個数等の
データにより前記磁気記録媒体の真偽を判定し、しかる
後に前記磁気書込みを磁気消去することを特徴とする磁
気記録媒体の真偽判定方法(1) In a magnetic recording medium that has an area where magnetic recording and reproduction is difficult or impossible, magnetic recording is performed on a track that includes the area, and then the presence or absence of reproduction output on the track, the interval, the time, or the A method for determining the authenticity of a magnetic recording medium, comprising determining the authenticity of the magnetic recording medium based on data such as the number of pieces, and then magnetically erasing the magnetic writing.
を特徴とする特許請求の範囲第１項記載の磁気記録媒体
の真偽判定方法(2) A method for determining authenticity of a magnetic recording medium according to claim 1, characterized in that the magnetic recording is magnetically erased after the determination.
び再生が不可能な領域を設けてなることを特徴とする磁
気記録媒体(3) A magnetic recording medium characterized by having an area in which magnetic recording and reproduction are not possible in a part of the area that is not a data track.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59199305A JPH0654522B2 (en) | 1984-09-22 | 1984-09-22 | Method of judging authenticity of magnetic recording medium and magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59199305A JPH0654522B2 (en) | 1984-09-22 | 1984-09-22 | Method of judging authenticity of magnetic recording medium and magnetic recording medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6177102A true JPS6177102A (en) | 1986-04-19 |
| JPH0654522B2 JPH0654522B2 (en) | 1994-07-20 |
Family
ID=16405587
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59199305A Expired - Lifetime JPH0654522B2 (en) | 1984-09-22 | 1984-09-22 | Method of judging authenticity of magnetic recording medium and magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0654522B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6391826A (en) * | 1986-10-06 | 1988-04-22 | Mitsubishi Heavy Ind Ltd | Method for preventing forgery of magnetic recording medium |
| JPS63194991A (en) * | 1987-02-09 | 1988-08-12 | 有限会社ビタ | Magnetic card |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5567941A (en) * | 1978-11-15 | 1980-05-22 | Toshiba Corp | Recording medium |
| JPS55146570A (en) * | 1979-05-02 | 1980-11-14 | Tohoku Metal Ind Ltd | Metallic piece embedded card and its reader |
| JPS5847531U (en) * | 1981-09-29 | 1983-03-30 | 三菱電機株式会社 | car mirror |
| JPS5865644U (en) * | 1981-10-24 | 1983-05-04 | 共同印刷株式会社 | magnetic recording medium |
| JPS58101385A (en) * | 1981-12-10 | 1983-06-16 | Tdk Corp | Magnetic card not erasable |
| JPS58111130A (en) * | 1981-12-24 | 1983-07-02 | Omron Tateisi Electronics Co | Magnetic recording medium |
| JPS58147820A (en) * | 1982-02-26 | 1983-09-02 | Toshiba Corp | Magnetic card |
-
1984
- 1984-09-22 JP JP59199305A patent/JPH0654522B2/en not_active Expired - Lifetime
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5567941A (en) * | 1978-11-15 | 1980-05-22 | Toshiba Corp | Recording medium |
| JPS55146570A (en) * | 1979-05-02 | 1980-11-14 | Tohoku Metal Ind Ltd | Metallic piece embedded card and its reader |
| JPS5847531U (en) * | 1981-09-29 | 1983-03-30 | 三菱電機株式会社 | car mirror |
| JPS5865644U (en) * | 1981-10-24 | 1983-05-04 | 共同印刷株式会社 | magnetic recording medium |
| JPS58101385A (en) * | 1981-12-10 | 1983-06-16 | Tdk Corp | Magnetic card not erasable |
| JPS58111130A (en) * | 1981-12-24 | 1983-07-02 | Omron Tateisi Electronics Co | Magnetic recording medium |
| JPS58147820A (en) * | 1982-02-26 | 1983-09-02 | Toshiba Corp | Magnetic card |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6391826A (en) * | 1986-10-06 | 1988-04-22 | Mitsubishi Heavy Ind Ltd | Method for preventing forgery of magnetic recording medium |
| JPS63194991A (en) * | 1987-02-09 | 1988-08-12 | 有限会社ビタ | Magnetic card |
| JPH0473719B2 (en) * | 1987-02-09 | 1992-11-24 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0654522B2 (en) | 1994-07-20 |
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