JPH01173410A - Magnetic head for magnetic medium - Google Patents
Magnetic head for magnetic mediumInfo
- Publication number
- JPH01173410A JPH01173410A JP33281987A JP33281987A JPH01173410A JP H01173410 A JPH01173410 A JP H01173410A JP 33281987 A JP33281987 A JP 33281987A JP 33281987 A JP33281987 A JP 33281987A JP H01173410 A JPH01173410 A JP H01173410A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- winding
- magnetic head
- recording medium
- head
- 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
- 238000004804 winding Methods 0.000 claims abstract description 16
- 239000000696 magnetic material Substances 0.000 claims description 4
- 230000005415 magnetization Effects 0.000 abstract description 3
- 230000007423 decrease Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Landscapes
- Digital Magnetic Recording (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は磁気ヘッドに関し、特Ｃ二特定の保持力を有す
る磁気カードなどの磁性記録媒体に対し、＠気カードの
偽造を防止する磁性媒体用磁気ヘッドに関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a magnetic head, and relates to a magnetic recording medium such as a magnetic card having a special C2 specific holding force, and a magnetic medium that prevents counterfeiting of @Ki cards. The present invention relates to a magnetic head for use.
キャブシュカード、テレホンカード、またはクレジット
カードなど磁性記録媒体が塗布された磁気カードは一般
：二＄気カード（−記録されているデータが磁気ヘッド
（−よって読み取られている。しかし磁気カード１；デ
ータを記録する磁気カードリーダライタも容易に人子で
きるようになったため、＠気カードの偽造防止対策が急
務となっている。A magnetic card coated with a magnetic recording medium, such as a cash card, telephone card, or credit card, is generally a two-dollar card (- the recorded data is read by a magnetic head (-).However, a magnetic card 1; Since magnetic card readers/writers that record data have become easily accessible, measures to prevent counterfeiting of @ki cards have become an urgent need.
従来この種の磁気カードの偽造を防止するため、磁気カ
ードへのデータの記録方式の改善。In order to prevent counterfeiting of conventional magnetic cards of this type, improvements have been made to the method for recording data on magnetic cards.
あるいは磁気ヘッドの構造を改良するなどの万策がとら
れている。Alternatively, measures are being taken to improve the structure of the magnetic head.
しかし従来のような記録方式の改善、磁気ヘッド構造の
改善など単独では完全に偽造を防止することが困難であ
る。その理由は従来の磁気カードのような保磁力の磁性
記録媒体が用いられるものに対しても少なからず書き込
みの能力を持っているためであると考えた。However, it is difficult to completely prevent counterfeiting by simply improving conventional recording methods and magnetic head structures. The reason for this is thought to be that it has a considerable ability to write even on magnetic recording media with coercive force, such as conventional magnetic cards.
本発明は従来のかかる欠点を除き、＠性記録媒体と接す
る面に磁気ギャップを設けた磁気コアに巻回された巻線
の両端基間に空心としての巻線を行なうか、あるいは磁
性体に巻線を行なったインダクタよりなるスライサを並
列：二接続し、且つインダクタのインピーダンスを磁気
ヘッドのインピーダンスより犬とする特定磁性媒体用磁
気ヘッドである。The present invention eliminates such drawbacks of the conventional method, and winds the wire as an air core between both end bases of the winding wire wound around a magnetic core having a magnetic gap on the surface in contact with the @-type recording medium, or This is a magnetic head for a specific magnetic medium, in which two slicers each made of a wound inductor are connected in parallel, and the impedance of the inductor is lower than the impedance of the magnetic head.
磁気ヘッドの巻線（＝並列にインダクタを接続したスラ
イサを有するため、印加する電圧信号は書き込まれる信
号の上下が切断され中央部分の信号波形に制限される。Since the magnetic head has a winding (=slicer with an inductor connected in parallel), the voltage signal to be applied is limited to the signal waveform of the central portion by cutting off the upper and lower ends of the written signal.
したがって磁気ギャップ近くの漏れ磁界は一定となり、
この磁界により磁化反転される磁性記録媒体のみ磁化さ
せる。Therefore, the leakage magnetic field near the magnetic gap is constant,
Only the magnetic recording medium whose magnetization is reversed by this magnetic field is magnetized.
本発明の特性磁性媒体用磁気ヘッドの実施例を第１図の
回路図に示す。An embodiment of the magnetic head for characteristic magnetic media of the present invention is shown in the circuit diagram of FIG.
図面に示すように磁気ギャップ２が設けられた磁気コア
１に巻回された巻線３の両端子間にスライサが接続され
る。本発明で実施されるスライサは巻線３の両端（＝並
列にインダクタ４を接続して磁性体記録用磁気ヘッド回
路の入力端子５，５１として外部回路と接続される。As shown in the drawings, a slicer is connected between both terminals of a winding 3 wound around a magnetic core 1 provided with a magnetic gap 2. The slicer according to the present invention is connected to an external circuit as input terminals 5, 51 of a magnetic head circuit for recording magnetic material by connecting an inductor 4 to both ends of the winding 3 (=parallel).
いまこの入力端子５，５′に外部回路より電流を流し、
＠気カードなどの磁性記録媒体にデータを書き込む場合
について説明する。この回路において磁気ヘッドのイン
ピーダンスｚ１に流れる記録電流を１２．インダクタ４
のインピーダンスを２２とし入力端子５，５１から流れ
る入力電流１１とすると１２＝（” ）ｈとなる。こ
ｚ１＋ｚ２
こにおいてｚｌ ＜ ｚ２となるようにすることによっ
て１２中１１となり入力端子５の入力電流にほぼ等しい
記録電流１２が磁気ヘッドの巻線３に部れる。通常使用
する書き込み電流を印加するとインダクタ４の磁気コア
１は磁気飽和をおこしｚ２が低下してｚ１＝ｚ２に近付
き１２＝１“乃 となり磁気ヘッドの巻線３（：流れる
記録電流１２が減少し、さらに人力電流１１を増加する
ときｚ２が低下しｚｌ〉ｚ２となり記録電流１２は著し
く流れ（：＜＜なり記録電流１２が制限されてくる。し
たがって磁気ヘッドの磁気コア１の磁気ギャップ２から
の漏れ磁界が特定保磁力を有する磁性記録媒体の磁化反
転させるの冨：十分となるよう ４な巻線３のインダク
タ４のインピーダンスｚ２を設定すれば記録媒体に書き
込みされる。さらに高い電圧の入力を印加してもスライ
スレベル以上に記録電流１２が流れないので磁気ギャッ
プ２からの漏れ磁界も増加することがない。Now, a current is applied to these input terminals 5 and 5' from the external circuit,
The case of writing data to a magnetic recording medium such as a @ki card will be explained. In this circuit, the recording current flowing through the impedance z1 of the magnetic head is 12. Inductor 4
If the impedance of is 22 and the input current flowing from input terminals 5 and 51 is 11, then 12 = ('' ) h. Here, z1 + z2 By making zl < z2, the input current of input terminal 5 becomes 11 out of 12. A recording current 12 approximately equal to 12 is applied to the winding 3 of the magnetic head. When a normally used write current is applied, the magnetic core 1 of the inductor 4 undergoes magnetic saturation, and z2 decreases and approaches z1 = z2, and 12 = 1". No Then, when the recording current 12 flowing in the winding 3 of the magnetic head decreases and the human power current 11 is further increased, z2 decreases, zl>z2, and the recording current 12 flows significantly (:<<, so the recording current 12 is limited. Therefore, the impedance z2 of the inductor 4 of the winding 3 is set so that the leakage magnetic field from the magnetic gap 2 of the magnetic core 1 of the magnetic head is sufficient to reverse the magnetization of a magnetic recording medium having a specific coercive force. By setting , data is written on the recording medium.Even if a higher voltage input is applied, the recording current 12 does not flow more than the slice level, so the leakage magnetic field from the magnetic gap 2 does not increase.
したがって磁気ヘッドの巻線３に流れる電流が入力電流
１１によって自然に制御され、所定の保磁力より高い保
磁力を有する他の磁性記録媒体へのデータの書き込みが
不可能で磁気カードの偽造が防止できる。Therefore, the current flowing through the winding 3 of the magnetic head is naturally controlled by the input current 11, making it impossible to write data to other magnetic recording media having a coercive force higher than a predetermined coercive force, thus preventing counterfeiting of magnetic cards. can.
以上に述べたように本発明；二よれば、磁気ギャップ２
が設けられた磁気コア１τ二巻回された巻線３の両端子
間に磁性体６に巻線したインダクタンスよりなるスライ
サを接続すること（＝よって簡単な構造と部品だけで磁
気カードなどの磁気記録媒体への書き込み能力が制限さ
れ磁気カードの偽造が防止できる。As described above, according to the present invention; the magnetic gap 2
A slicer made of an inductance wound around a magnetic material 6 is connected between both terminals of a winding 3 wound with a magnetic core 1τ2 (=therefore, with a simple structure and components, it is possible to The ability to write to the recording medium is restricted and counterfeiting of magnetic cards can be prevented.
第１図は本発明の媒体磁気ヘッドの実施例を示す回路図
である。
なお
に＠気コア、２：＠気ギャップ、３：巻線。
４：インダクタ、５，５°：入力端子、６：磁性体。FIG. 1 is a circuit diagram showing an embodiment of the magnetic medium head of the present invention. Nao @ki core, 2: @ki gap, 3: winding wire. 4: Inductor, 5,5°: Input terminal, 6: Magnetic material.
Claims (1)
間にスライサを接続したことを特徴とする磁性媒体用磁
気ヘッド。 ２、前記スライサとしてインダクタを前記巻線の両端子
間に並列に接続する特許請求の範囲第１項記載の磁性媒
体用磁気ヘッド。 ３、前記インダクタは磁性体に巻線された特許請求の範
囲第２項記載の磁性媒体用磁気ヘッド。 ４、前記磁気ヘッドのインピーダンスＺ＿１と前記イン
ダクタのインピーダンスＺ＿２との間にＺ＿１≪Ｚ＿２
の関係を有する特許請求の範囲第２項および第３項記載
の磁性媒体用磁気ヘッド。 ５、前記磁気ヘッド内に前記スライサを内蔵させる特許
請求の範囲第１項記載の磁性媒体用磁気ヘッド。[Claims] 1. A magnetic head for magnetic media, characterized in that a slicer is connected between both terminals of a winding of a magnetic core provided with a magnetic gap. 2. The magnetic head for magnetic media according to claim 1, wherein an inductor is connected in parallel between both terminals of the winding as the slicer. 3. The magnetic head for magnetic media according to claim 2, wherein the inductor is wound around a magnetic material. 4. Z_1<<Z_2 between the impedance Z_1 of the magnetic head and the impedance Z_2 of the inductor.
A magnetic head for magnetic media according to claims 2 and 3 having the following relationship. 5. The magnetic head for magnetic media according to claim 1, wherein the slicer is built into the magnetic head.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62332819A JP2598657B2 (en) | 1987-12-28 | 1987-12-28 | Porcelain head for magnetic media |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62332819A JP2598657B2 (en) | 1987-12-28 | 1987-12-28 | Porcelain head for magnetic media |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01173410A true JPH01173410A (en) | 1989-07-10 |
| JP2598657B2 JP2598657B2 (en) | 1997-04-09 |
Family
ID=18259157
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62332819A Expired - Fee Related JP2598657B2 (en) | 1987-12-28 | 1987-12-28 | Porcelain head for magnetic media |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2598657B2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0711848A (en) * | 1993-06-25 | 1995-01-13 | Nec Corp | Door sealing structure of closed room |
-
1987
- 1987-12-28 JP JP62332819A patent/JP2598657B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0711848A (en) * | 1993-06-25 | 1995-01-13 | Nec Corp | Door sealing structure of closed room |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2598657B2 (en) | 1997-04-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |