WO1991001547A1 - Reader/writer for magnetic cards - Google Patents
Reader/writer for magnetic cards Download PDFInfo
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- WO1991001547A1 WO1991001547A1 PCT/JP1990/000907 JP9000907W WO9101547A1 WO 1991001547 A1 WO1991001547 A1 WO 1991001547A1 JP 9000907 W JP9000907 W JP 9000907W WO 9101547 A1 WO9101547 A1 WO 9101547A1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/01—Details
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/08—Methods or arrangements for sensing record carriers, e.g. for reading patterns by means detecting the change of an electrostatic or magnetic field, e.g. by detecting change of capacitance between electrodes
- G06K7/082—Methods or arrangements for sensing record carriers, e.g. for reading patterns by means detecting the change of an electrostatic or magnetic field, e.g. by detecting change of capacitance between electrodes using inductive or magnetic sensors
- G06K7/083—Methods or arrangements for sensing record carriers, e.g. for reading patterns by means detecting the change of an electrostatic or magnetic field, e.g. by detecting change of capacitance between electrodes using inductive or magnetic sensors inductive
- G06K7/084—Methods or arrangements for sensing record carriers, e.g. for reading patterns by means detecting the change of an electrostatic or magnetic field, e.g. by detecting change of capacitance between electrodes using inductive or magnetic sensors inductive sensing magnetic material by relative movement detecting flux changes without altering its magnetised state
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- 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
Definitions
- a magnetic force reader / writer device for rewriting information is used.
- the Card's company prevents theft and forgery of magnetic data by means such as covering the magnetic card with a magnetic shielding layer. Also, it is usually difficult for ordinary people to obtain a magnetic head that can write data to a magnetic card. This helps prevent forgery of the magnetic card.
- a magnetic head reader that is used when a magnetic head is used is provided with a magnetic head to which data can be written. For this reason, in some cases, the reader-writer was stolen and used to forge a magnetic force.
- the present invention solves the above-mentioned conventional problems and provides a reader / writer device which is effective in preventing forgery or the like of data of a magnetic force.
- a reader / writer device that reads and writes data from and to a magnetic card must be mounted in a direction that generates a magnetic field that erases data.
- the erasing head is provided with a backflow prevention circuit that allows the head current to flow only and prevents the generation of a magnetic field in the opposite direction.
- the backflow prevention circuit is provided with a diode, or a head current in one direction is allowed to flow as it is, and a head in the opposite direction is provided. It is characterized by inverting and flowing current.
- the magnetic card reader / writer device can be equipped with an erasing head that cannot rewrite data.
- the reader / writer In order to process the magnetic card, even if the reader / writer is stolen, it cannot be used to forge the magnetic force even if the reader is stolen. There is.
- the head for erasing since the head for erasing has a backflow prevention circuit, Even if the circuit around the erasing head is modified, it cannot be used for rewriting data, and the effect is that safety is increased.
- FIG. 1 is a circuit diagram showing an erasing head of a reader / writer device according to one embodiment of the present invention.
- FIG. 2 is a circuit diagram showing a second embodiment of the erasing head
- FIG. 3 is a circuit diagram showing a third embodiment of the erasing head
- FIG. 4 is an erasing head used in the last embodiment.
- FIG. 4 (a) shows a state before erasing
- FIG. 4 (b) shows a state after erasing.
- the reader / writer device of the embodiment has a read / write head for reading / writing magnetic card data and an erasing head for only erasing data. And a head.
- the erasing head used in this embodiment is composed of a magnetic head 2 and a backflow prevention circuit 3 as shown in FIG.
- the circuit around the erasing head is composed of a resistor 11 for controlling the head current, an NPN transistor 13, a control system (not shown) and an NFN transistor. It has an erasure control line 14 that connects to the transistor 13. As a result, the control current sent from the erase control line 14 is limited to the transistor
- the magnetic field is amplified by the magnetic head 13, and a magnetic field is generated from two magnetic heads.
- the control current flowing through this circuit flows only in a fixed direction by the transistor 13, and therefore, a magnetic field is generated only in one direction from the magnetic head 2.
- the erasing head of the embodiment is almost unusable for digging data that requires a magnetic field in the opposite direction to the erasing.
- the backflow prevention circuit 3 has a diode 12 a connected in parallel with the magnetic head 2. As a result, the head current flowing through the magnetic head 2 flows only when the control current is almost constant. Therefore, even if the circuit around the erasing head is modified, or if only the erasing head is removed and connected to other circuits, it is impossible to write data. .
- FIG. 2 is a view showing a second embodiment of the erasing head.
- the backflow prevention circuit 3 of the thick embodiment has a diode 12 b connected in series to the magnetic head 2. *
- the head current flows only when the control current in a certain direction is generated by the backflow prevention circuit 3. For this reason, it is impossible to write data because a magnetic field is generated only in one direction from the magnetic head 2.
- FIG. 3 is a diagram showing a third embodiment of the erasing head. *
- the diodes 12c, 12d, 12e, and 12f are arranged in S rows as shown in the figure.
- the head current flows only in a certain direction irrespective of the characteristics of the input control current. did As a result, the magnetic head 2 always generates a magnetic field only in one direction, and data cannot be written.
- the resistance value of the erasing head of the example is measured with a tester or the like, the value is the same regardless of the current S property, so that the structure is external. It is not easy to remove.
- the erasing head of this embodiment cannot write data to the magnetic card, so it is necessary to overwrite new data when using it. It cannot be used for data tracks of this type. Therefore, an erasing data track is required to adapt to the erasing head of the embodiment.
- the format of the erasure data track is set so as to have the S-character shown in FIG. 5A.
- the data track for erasing has a plurality of blocks 51 whose magnetic states are changed, and the number of the blocks 51 depends on the number of the blocks 51. Indicates certain information. For example, each time the magnetic force is used, the blocks 51 are erased one by one, and the remaining blocks 51 indicate the number of uses of the remaining magnetic force. You can do it.
- FIG. 5 (b) shows a state in which the block 51 of the portion A in FIG. 5 (a) is DC-erased.
- the block 51 is shown with three consecutive changes in the magnetic state in the example, but it is not necessary to limit the change to three changes, for example, by one change. May be shown.
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- Engineering & Computer Science (AREA)
- Artificial Intelligence (AREA)
- Computer Vision & Pattern Recognition (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Computer Security & Cryptography (AREA)
- Signal Processing (AREA)
- Control Of Vending Devices And Auxiliary Devices For Vending Devices (AREA)
- Digital Magnetic Recording (AREA)
- Recording Or Reproducing By Magnetic Means (AREA)
Abstract
A reader/writer effective in preventing forgery of data recorded in magnetic cards, wherein an erasing head (1) is provided with a reverse current preventing circuit (3) that permits the head current to flow in only a direction in which a magnetic field for erasing data is generated and that prevents the generation of a magnetic field in the opposite direction. As a result, a reader/writer for magnetic cards can be equipped with an erasing head by which data is not rewritten. Therefore, even in case the reader/writer is stolen, it cannot be used for forging data in magnetic cards. Moreover, provision of the reverse current preventing circuit (3) makes it impossible to rewrite data in magnetic cards even if the circuitry associated with the erasing head is modified, and the safety is improved.
Description
明 細 磁気 カ ー ド の リ ー ダ一 ラ イ タ 装置 Magnetic card reader / writer
[技術分野 ] [Technical field ]
本発明 は 、 プ リ ペ イ ド カ ー ド等の使用 に 際 し 、 情報 の 書換 え を 行 う 磁気 力 一 ド の リ ー ダ 一 ラ イ タ 装置 に 閭す る 。 According to the present invention, when a prepaid card or the like is used, a magnetic force reader / writer device for rewriting information is used.
[背景技術 ] [Background Art]
近年、 磁気デ ー タ に よ っ て情報 を記録す る 磁気 力 一 ド の用途 と し て 、 記録 し た デ ー タ を 読取 る だ け で な く 使用 の際 に デー タ を 書換 え る も のが増 え て い る 。 例 え ば、 使 用 の 度 に 残 リ の 使用 度 数 や 金額 を 書換 え る プ リ ペ イ ド 力 一 ド等 で あ る 。 In recent years, the use of magnetic force to record information using magnetic data is not only to read the recorded data but also to rewrite the data at the time of use. Are increasing. For example, there is a prepaid function that rewrites the number of uses and the amount of money for each use.
従来 こ の種 の磁気 力 一 ド の デー タ の書换 え は 、 ま ず現 デ ー タ を 読取 っ た後、 新た なデ ー タ を 磁気 ス ト ラ イ プ に 上書 き す る こ と に よ り 行 われ て いた。 Conventionally, the writing of data of this type of magnetic force is performed by first reading the current data and then overwriting the new data on the magnetic stripe. Was carried out by
と こ ろ で 、 こ の 種 の 磁 気 カ ー ド の 普 及 に 伴 っ て 磁気 デ ー タ を 偽造、 複製す る と い つ た不正行為が行われ る よ う に な つ た。 At the same time, with the spread of this type of magnetic card, fraudulent acts such as forging and duplicating magnetic data began to take place.
こ れ に対 し 、 カ ー ド'会社 は磁気 カ ー ド を 磁気隠べ い層 で覆 う 等の手段 に よ り 磁気デ ー タ の盜用 、 偽造等 を 防 い で い る 。 ま た 、 通常、 磁気 カ ー ド に デー タ を 書込 む こ と が で き る 磁気 へ ッ ド を 一 般人 が入 手 す る こ と は 困難 で
ぁ リ 、 磁気 カ ー ド の偽造防止 に役立 っ て い る 。 In contrast, the Card's company prevents theft and forgery of magnetic data by means such as covering the magnetic card with a magnetic shielding layer. Also, it is usually difficult for ordinary people to obtain a magnetic head that can write data to a magnetic card. This helps prevent forgery of the magnetic card.
し か し なが ら 、 磁気 力 一 ドの使用 の際に 用 い られ る 磁 気 力一 ド の リ 一ダ一 ラ ィ タ 装置に はデー タ の書込み可能 な磁気へ ッ ドが設け られて い る ため 、 リ ー ダ一 ラ イ タ 装 置 を盗み、 これを 用 い て磁気 力 一 ドの偽造が行われ る場 合があ っ た。 However, a magnetic head reader that is used when a magnetic head is used is provided with a magnetic head to which data can be written. For this reason, in some cases, the reader-writer was stolen and used to forge a magnetic force.
[発明の開示 ] [Disclosure of the Invention]
本発明 は上記従来 の課題を解決 し 、 磁気 力 一 ドのデ一 タ の偽造等の防止 に有効 な リ 一 ダ一 ラ ィ タ 装置 を提供す る も の で ぁ リ 、 かか る 目 的 を達成す る ため 、 磁気 カ ー ド に対 し デー タ の読取 り と 書込み を行 う リ ー ダ一 ラ イ タ 装 置 に おい て、 デー タ 消去 を 行 う 磁界を 発生 さ せ る 方向 の み にへ ッ ド電流 を流 し 、 逆方向 の磁界の発生 を 防止す る 逆流 防止 回路 を 消去用 へ ッ ド に 設 け た こ と を 特徴 と す る 。 SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems and provides a reader / writer device which is effective in preventing forgery or the like of data of a magnetic force. To achieve this, a reader / writer device that reads and writes data from and to a magnetic card must be mounted in a direction that generates a magnetic field that erases data. The erasing head is provided with a backflow prevention circuit that allows the head current to flow only and prevents the generation of a magnetic field in the opposite direction.
そ し て よ り 好 ま し く は 、 逆流防止回路が ダ イ オ ー ド' を 備 え 、 あ る い は一方向 のへ ッ ド電流を そ の ま ま流 し 、 逆 方向 のへ ッ ド電流 を 反転 し て流す こ と を特徴 と す る 。 And more preferably, the backflow prevention circuit is provided with a diode, or a head current in one direction is allowed to flow as it is, and a head in the opposite direction is provided. It is characterized by inverting and flowing current.
こ の結果、 磁気 カ ー ド の リ ー ダ一 ラ イ タ 装置 に はデ一 タ の 書換 え が で き な い 消 去用 へ ッ ド を 設 け る こ と が で き 、 こ れ に よ つ て磁気 カ ー ド を処理す る ため 、 た と え リ — ダ一 ラ ィ タ 装置を盜 まれて も 磁気 力 一 ド の偽造 に用 い られ る こ と が なレ、 と レ、 ラ 効果があ る 。 As a result, the magnetic card reader / writer device can be equipped with an erasing head that cannot rewrite data. In order to process the magnetic card, even if the reader / writer is stolen, it cannot be used to forge the magnetic force even if the reader is stolen. There is.
ま た 、 消去 用 へ ッ ド に 逆流 防止 回路 を 備 え たた め 、
消去用へ ッ ド周辺 の 回路の改造等 に よ っ て も デ ー タ の書 換え に使用 す る こ と がで き ず、 安全性が増す と い う 効果 力 め る 。 In addition, since the head for erasing has a backflow prevention circuit, Even if the circuit around the erasing head is modified, it cannot be used for rewriting data, and the effect is that safety is increased.
[図面の簡単 な説明 ] [Brief description of drawings]
第 1 図は本発明 の一実施例 に係 る リ ー ダ 一 ラ ィ タ 装置 の消去用へ ッ ド を 示す回路 図、 FIG. 1 is a circuit diagram showing an erasing head of a reader / writer device according to one embodiment of the present invention.
第 2 図は消去用 へ ッ ド の第 2 実施例 を 示す回路図、 第 3 図は消去用へ ッ ド の第 3 実施例 を 示す 回路 図、 第 4 図は末実施例 に用 い る 消去用 デ 一一タ ト ラ ッ ク を 示 す図 で あ り 、 第 4 図 (a ) は消去前 を 示 し 、 第 4 図 (b ) は 消去後 を 示す。 FIG. 2 is a circuit diagram showing a second embodiment of the erasing head, FIG. 3 is a circuit diagram showing a third embodiment of the erasing head, and FIG. 4 is an erasing head used in the last embodiment. FIG. 4 (a) shows a state before erasing, and FIG. 4 (b) shows a state after erasing.
[発明 を 実施す る た め の最良の形態 ] [Best mode for carrying out the invention]
以下、 本発明 の実施例 に つい て 図面 を参照 し て説明す る 。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
*実施例 の リ ー ダ一 ラ イ タ 装置は 、 磁気 カ ー ド の デ一 タ を 読み書 き す る 読み書 き 用へ ッ ド と 、 デ ー タ の消去 の み を行 う 消去用へ ッ ド と を設け て な る 。 * The reader / writer device of the embodiment has a read / write head for reading / writing magnetic card data and an erasing head for only erasing data. And a head.
本実施例 に用 い る 消去用へ ッ ド は第 1 図 に示す如 く 磁 気へ ッ ド 2 と 逆流防止回路 3 と か ら な る 。 The erasing head used in this embodiment is composed of a magnetic head 2 and a backflow prevention circuit 3 as shown in FIG.
ま た 、 消去用 へ ッ ド周辺の 回路はへ ッ ド電流 を 制御す る た め の 抵抗 1 1 と 、 N P N 型 ト ラ ン ジ ス タ 1 3 と 、 図示 し な い制御系 と N F N型 ト ラ ン ジ ス タ 1 3 と を接続 す る 消 去制御 ラ イ ン 1 4 と を 有 す る 。 こ れ に よ つ て 、 消去制御 ラ イ ン 1 4 か ら送 られ る 制御電流 は ト ラ ン ジ ス
タ 1 3 に よ っ て増幅 され、 磁気へ ッ ド 2 カゝ ら磁界 を発生 さ せ る 。 こ こ で本回路を流れる 制御電流は ト ラ ン ジ ス タ 1 3 に よ っ て一定方向 に し か流れ な いため、 磁気へ ッ ド 2 か ら は一方向 に の み磁界が発生す る こ と と な る 。 し た が っ て *実施例の消去用へ ッ ド は、 消去 と 反対方向 の磁 界 を必要 と す る デー タ の睿込み に ほ使用不可能 と な る 。 The circuit around the erasing head is composed of a resistor 11 for controlling the head current, an NPN transistor 13, a control system (not shown) and an NFN transistor. It has an erasure control line 14 that connects to the transistor 13. As a result, the control current sent from the erase control line 14 is limited to the transistor The magnetic field is amplified by the magnetic head 13, and a magnetic field is generated from two magnetic heads. Here, the control current flowing through this circuit flows only in a fixed direction by the transistor 13, and therefore, a magnetic field is generated only in one direction from the magnetic head 2. And Therefore, the erasing head of the embodiment is almost unusable for digging data that requires a magnetic field in the opposite direction to the erasing.
上記逆流防止回路 3 は 、 磁気へ ッ ド 2 に並列に接続 し た ダ イ オ ー ド 1 2 a を有 し て な る 。 これ に よ つ て、 磁気 へ ッ ド 2 を流れ る へ ッ ド電流ほ一定方向 の制御電流の と き に しか流れ な い。 し たが っ て 、 消去用へ ッ ド周辺の 回 路 を 改造 し た り 、 消去用へ ッ ドの み を取外 し て他の 回路 に接続 し て も デー タ の書込みほ不可能であ る 。 The backflow prevention circuit 3 has a diode 12 a connected in parallel with the magnetic head 2. As a result, the head current flowing through the magnetic head 2 flows only when the control current is almost constant. Therefore, even if the circuit around the erasing head is modified, or if only the erasing head is removed and connected to other circuits, it is impossible to write data. .
第 2 図ほ消去用へ ッ ド の第 2 実施例 を示す図であ る 。 太実施例 の逆流防止回路 3 は磁気へ ッ ド 2 に直列 に接 続 し た ダ イ オ ー ド 1 2 b を有 し て な る 。 *実施例に おい て も 、 へ ッ ド電流は逆流防止回路 3 に よ っ て一定方向 の 制御電流の と き に し か流れな い。 こ の た め 、 磁気へ ッ ド 2 か ら ほ一方向 に の み磁界が発生す る こ と と な リ 、 デー タ の書込みは不可能 と な る 。 FIG. 2 is a view showing a second embodiment of the erasing head. The backflow prevention circuit 3 of the thick embodiment has a diode 12 b connected in series to the magnetic head 2. * In the embodiment as well, the head current flows only when the control current in a certain direction is generated by the backflow prevention circuit 3. For this reason, it is impossible to write data because a magnetic field is generated only in one direction from the magnetic head 2.
第 3 図は消去用へ ッ ドの第 3 実施例 を示す図であ る 。 *実施例 の 逆流防止 回路 3 は 、 ダ イ オ ー ド 1 2 c , 1 2 d , 1 2 e , 1 2 f を 図示の如 く S列 し て な る 。 太 実施例 に お い て は、 入力す る 制御電流の毪性 に閬係な く へ ッ ド 電流 ほ 一定方 向 に の み流れ る こ と と な る 。 し た
が っ て 、 磁気へ ッ ド 2 か ら は 常 に一方向 に の み磁界が発 生す る こ と と な リ 、 デー タ の書込み は不可能 と な る 。 FIG. 3 is a diagram showing a third embodiment of the erasing head. * In the backflow prevention circuit 3 of the embodiment, the diodes 12c, 12d, 12e, and 12f are arranged in S rows as shown in the figure. In the embodiment, the head current flows only in a certain direction irrespective of the characteristics of the input control current. did As a result, the magnetic head 2 always generates a magnetic field only in one direction, and data cannot be written.
ま た 、 *実施例の消去用 へ ッ ド は 、 テ ス タ 一等 で抵抗 値 を測定 し た場合、 電流 S性の如何 に関 ら ず同 じ値 と な る た め 、 構造が外都か ら わ力 リ に く い。 Also, when the resistance value of the erasing head of the example is measured with a tester or the like, the value is the same regardless of the current S property, so that the structure is external. It is not easy to remove.
なお、 本実施例の消去用へ ッ ド は磁気 カ ー ド への デ 一 タ の書込みがで.き な い た め 、 使用 に 際 し新た なデー タ の 上書 き を必要 と す る 通常のデー タ ト ラ ッ ク に は使用 で き な い。 そ こ で *実施例の消去用へ ッ ド に適応す る 消去用 デ 一 タ ト ラ ッ ク が必要 と な る 。 消去用デ一 タ ト ラ ッ ク の フ ォ ー マ ツ ト は第 5 図 a に示す S性 と な る よ う に設定 さ れ る 。 Note that the erasing head of this embodiment cannot write data to the magnetic card, so it is necessary to overwrite new data when using it. It cannot be used for data tracks of this type. Therefore, an erasing data track is required to adapt to the erasing head of the embodiment. The format of the erasure data track is set so as to have the S-character shown in FIG. 5A.
図示の様 に 消去用 デー タ ト ラ ツ ク は 、 磁気状態 を 変化 さ せ た ブ ロ ッ ク 5 1 を 複 数 設 け て あ り 、 こ の ブ ロ ッ ク 5 1 の数 に よ っ て一定 の情報 を示す。 例え ば磁気 力 一 ド を 使用 す る 度に ブ ロ ッ ク 5 1 を 1 つずつ消去 し 、 残 っ た ブ ロ ッ ク 5 1 に よ っ て磁気 力 一 ド の残 リ の使用度数 を 示 す こ と がで き る 。 第 5 図 (a ) の A 部分の ブ ロ ッ ク 5 1 を 直流消去 し た状態 を第 5 図 (b ) に示す。 As shown in the figure, the data track for erasing has a plurality of blocks 51 whose magnetic states are changed, and the number of the blocks 51 depends on the number of the blocks 51. Indicates certain information. For example, each time the magnetic force is used, the blocks 51 are erased one by one, and the remaining blocks 51 indicate the number of uses of the remaining magnetic force. You can do it. FIG. 5 (b) shows a state in which the block 51 of the portion A in FIG. 5 (a) is DC-erased.
な お、 未実施例では ブ ロ ッ ク 5 1 を磁気状態の変化 を 3 っ連統 さ せて示 し たが、 3 変化 に 限 る 必要は な く 、 例 え ば 1 変化 に よ っ て示 し て も よ い。
In the example, the block 51 is shown with three consecutive changes in the magnetic state in the example, but it is not necessary to limit the change to three changes, for example, by one change. May be shown.
Claims
( 1 ) 磁気力 一 ド に対 し デー タ の読取 り と 書込み を行 う リ 一ダー ラ ィ タ 装置 に おい て 、 (1) In a reader / writer device that reads and writes data from and to a magnetic force,
タ 消去 を行 ラ 磁界 を発生 さ せ る 方向 の み にへ ッ ド Head erase only in the direction in which the magnetic field is generated
¾流 を流 し 、 逆方向 の磁界の発生を 防止す る 逆流防止回 路 を 消去用へ ッ ド に設けた こ と を特徴 と す る 磁気 カ ー ド の リ ー ダ一 ラ イ タ 装置。 A reader / writer device for a magnetic card, wherein a backflow prevention circuit is provided in an erasing head for flowing a current and preventing generation of a magnetic field in a reverse direction.
( 2 ) 逆流防止 回路 が ダ イ ォ ー ド を 備 え て な る こ と を 特徴 と す る 請求の範囲第 1 項 に記載の磁気 力 一 ド の リ 一 ダ一 ラ イ タ 装置。 (2) The reader / writer device of the magnetic force pad according to claim 1, wherein the backflow prevention circuit is provided with a diode.
( 3 ) 逆流防止回路が、 一方向 のへ ッ ド電流 を そ の ま ま 流 し 、 逆方向 のへ ッ ド電流 を反転 し て流す こ と を特徴 と す B目求の範囲第 1 項記載の磁気力 一 ド の リ 一 ダ一 ラ ィ タ 装置
(3) The backflow prevention circuit is characterized in that the head current in one direction is allowed to flow as it is, and the head current in the opposite direction is inverted and flowed. Magnetic force reader writer
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1/181768 | 1989-07-14 | ||
JP18176889A JPH0346103A (en) | 1989-07-14 | 1989-07-14 | Reader/writer for magnetic head |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1991001547A1 true WO1991001547A1 (en) | 1991-02-07 |
Family
ID=16106548
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1990/000907 WO1991001547A1 (en) | 1989-07-14 | 1990-07-13 | Reader/writer for magnetic cards |
Country Status (2)
Country | Link |
---|---|
JP (1) | JPH0346103A (en) |
WO (1) | WO1991001547A1 (en) |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6019041B2 (en) * | 1975-05-02 | 1985-05-14 | 株式会社東芝 | Multilayer magnetic recording and reproducing device |
JPS63131306A (en) * | 1986-11-20 | 1988-06-03 | Tokyo Jiki Insatsu Kk | Magnetic card and method and device for recording and reproduction thereof |
JPS6334522B2 (en) * | 1978-09-18 | 1988-07-11 | Tokyo Jiki Insatsu Kk | |
JPS63222307A (en) * | 1987-03-11 | 1988-09-16 | Toshiba Corp | Information recording and reproducing device |
JPS6353605B2 (en) * | 1980-12-25 | 1988-10-25 | Tokyo Jiki Insatsu Kk | |
JPH01173412A (en) * | 1987-12-28 | 1989-07-10 | Tokin Corp | Magnetic head |
-
1989
- 1989-07-14 JP JP18176889A patent/JPH0346103A/en active Pending
-
1990
- 1990-07-13 WO PCT/JP1990/000907 patent/WO1991001547A1/en unknown
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6019041B2 (en) * | 1975-05-02 | 1985-05-14 | 株式会社東芝 | Multilayer magnetic recording and reproducing device |
JPS6334522B2 (en) * | 1978-09-18 | 1988-07-11 | Tokyo Jiki Insatsu Kk | |
JPS6353605B2 (en) * | 1980-12-25 | 1988-10-25 | Tokyo Jiki Insatsu Kk | |
JPS63131306A (en) * | 1986-11-20 | 1988-06-03 | Tokyo Jiki Insatsu Kk | Magnetic card and method and device for recording and reproduction thereof |
JPS63222307A (en) * | 1987-03-11 | 1988-09-16 | Toshiba Corp | Information recording and reproducing device |
JPH01173412A (en) * | 1987-12-28 | 1989-07-10 | Tokin Corp | Magnetic head |
Also Published As
Publication number | Publication date |
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JPH0346103A (en) | 1991-02-27 |
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