JP2535198B2 - Erase-only magnetic head circuit - Google Patents
Erase-only magnetic head circuitInfo
- Publication number
- JP2535198B2 JP2535198B2 JP63010864A JP1086488A JP2535198B2 JP 2535198 B2 JP2535198 B2 JP 2535198B2 JP 63010864 A JP63010864 A JP 63010864A JP 1086488 A JP1086488 A JP 1086488A JP 2535198 B2 JP2535198 B2 JP 2535198B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- circuit
- magnetic head
- winding
- erase
- 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
- Recording Or Reproducing By Magnetic Means (AREA)
- Magnetic Heads (AREA)
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，特に，磁気カード等の磁
気記録媒体に記録されたデータを消去するためだけに用
いられる消去専用磁気ヘッド回路に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head, and more particularly to an erase-only magnetic head circuit used only for erasing data recorded on a magnetic recording medium such as a magnetic card. Is.
最近，キャッシュカード，テレホンカード，及びクレ
ジットカード等の磁気カードが普及し，カード時代の到
来と言われている。この磁気カードの普及に伴い，磁気
カードにデータを書き込んだり磁気カードからデータを
読み出すことが可能な装置，所謂，磁気カードリーダラ
イタも発売され，一般の人にも磁気カードリーダライタ
が容易に手に入るようになってきた。このため，磁気カ
ードの偽造防止対策が急務となっている。Recently, magnetic cards such as cash cards, telephone cards, and credit cards have spread, and it is said that the card era has arrived. With the spread of this magnetic card, a device capable of writing data to the magnetic card and reading data from the magnetic card, that is, a so-called magnetic card reader / writer has been put on the market. I started to enter. For this reason, measures to prevent forgery of magnetic cards are urgently needed.
従来の磁気カードの偽造防止対策は，磁気カードへデ
ータを記録する際の記録信号方式を改良したり，或いは
磁気ヘッドの構造を改良することにより行なわれてい
る。Countermeasures against forgery of conventional magnetic cards have been implemented by improving the recording signal system for recording data on the magnetic card or by improving the structure of the magnetic head.
しかしながら，現在のところ，単独で万全というもの
がないので，上述した方法を組み合わせた偽造防止対策
が講じられているのが実状である。However, at present, there is no such thing as perfection alone, so the actual situation is that forgery prevention measures are taken by combining the above-mentioned methods.
本発明者らは，従来の対策で完全に磁気カードの偽造
防止ができないのは，従来の磁気ヘッドが書き込み機能
を持っているためであると考えた。The present inventors considered that the conventional measures cannot completely prevent the magnetic card from being forged because the conventional magnetic head has a writing function.
従って，本発明の目的は，磁気ヘッドの構造を改良す
ることにより，磁気カード等の磁気記録媒体へデータを
書き込む機能を除去し，磁気記録媒体に記録されている
データを消去することのみ可能な消去専用磁気ヘッド回
路を提供することにある。Therefore, the object of the present invention is only to improve the structure of the magnetic head so that the function of writing data to a magnetic recording medium such as a magnetic card can be removed and the data recorded on the magnetic recording medium can be erased. It is to provide a magnetic head circuit dedicated to erasing.
本発明による消去専用磁気ヘッド回路はギャップを持
った磁気コアに巻回された巻線の両端子間に整流回路を
接続したことを特徴とする。The erase-only magnetic head circuit according to the present invention is characterized in that a rectifier circuit is connected between both terminals of a winding wound around a magnetic core having a gap.
このような構成によると，磁気記録媒体にデータを書
き込もうとして整流回路を介し巻線間に電圧信号波形を
印加しようとしても，巻線間には整流回路により直流電
圧波形しか得られない。この直流電圧により巻線に流れ
る直流電流では，磁気コアのギャップ近傍には一方向の
漏れ磁界しか生ぜず，磁気記録媒体は一方向にしか磁化
されない。従って，この消去専用磁気ヘッド回路では，
磁気記録媒体にデータを書き込むことができず，磁気記
録媒体に記録されているデータを消去することのみ可能
である。With such a configuration, even if an attempt is made to write data to the magnetic recording medium and a voltage signal waveform is applied between the windings via the rectifying circuit, only a DC voltage waveform can be obtained between the windings by the rectifying circuit. The DC current flowing in the winding due to this DC voltage produces only a leakage magnetic field in one direction near the gap of the magnetic core, and the magnetic recording medium is magnetized in only one direction. Therefore, in this erase-only magnetic head circuit,
Data cannot be written on the magnetic recording medium, and only the data recorded on the magnetic recording medium can be erased.
以下，本発明の実施例について図面を参照して説明す
る。Embodiments of the present invention will be described below with reference to the drawings.
第１図を参照して，本発明の第１の実施例による消去
専用磁気ヘッド回路は，ギャップをもった磁気コア１
と，磁気コア１に巻回された巻線２からなる磁気ヘッド
を有する。巻線２の両端子−′間には整流回路３が
接続されている。本実施例の整流回路３は，巻線２の両
端子−′間に接続されたコンデンサＣと巻線２の一
方の端子にカソードが接続されたダイオードD1とから成
る。ダイオードD1のアノードは端子に接続され，巻線
２の端子′は端子′に接続されている。実際の消去
専用磁気ヘッド回路では，磁気ヘッドと整流回路３とは
一体に構成される。すなわち，巻線２の両端子−′
への整流回路３の接続は，磁気ヘッド内部で行なわれ，
整流回路３の端子−′が本消去専用磁気ヘッド回路
の端子として外部回路と接続される。次に，このような
構成の消去専用磁気ヘッド回路に，外部回路より電流を
流すことにより，磁気カード等の磁気記録媒体にデータ
を書き込もうとした場合について説明する。この場合，
端子−′間に書込み信号を印加しても，整流回路３
により巻線２の端子−′間には整流された直流電圧
が加わる。その為，巻線２には直流電流しか流れず，磁
気記録媒体にデータを書込むことができない。従って，
もし磁気記録媒体にデータが記録されていたとすれば，
そのデータは消去される。Referring to FIG. 1, the erase-only magnetic head circuit according to the first embodiment of the present invention is a magnetic core 1 having a gap.
And a magnetic head comprising a winding 2 wound around a magnetic core 1. A rectifying circuit 3 is connected between both terminals-'of the winding 2. The rectifier circuit 3 of this embodiment comprises a capacitor C connected between both terminals − ′ of the winding 2 and a diode D 1 having a cathode connected to one terminal of the winding 2. The anode of the diode D 1 is connected to the terminal and the terminal 'of the winding 2 is connected to the terminal'. In an actual erase-only magnetic head circuit, the magnetic head and the rectifier circuit 3 are integrally formed. That is, both terminals of winding 2-'
The rectifier circuit 3 is connected to the inside of the magnetic head,
The terminal-'of the rectifier circuit 3 is connected to an external circuit as a terminal of the magnetic head circuit dedicated to main erasure. Next, a case will be described in which an attempt is made to write data to a magnetic recording medium such as a magnetic card by causing a current to flow from an external circuit to the magnetic head circuit dedicated to erasing having such a configuration. in this case,
Even if a write signal is applied between the terminals-', the rectifier circuit 3
As a result, a rectified DC voltage is applied between the terminals -'of the winding 2. Therefore, only DC current flows through the winding 2, and data cannot be written on the magnetic recording medium. Therefore,
If the data was recorded on the magnetic recording medium,
The data will be erased.
なお，本発明は上記実施例に限定しないのは勿論であ
る。例えば，第２図に示されるように，第１図のダイオ
ードD1の代わりにトランジスタTrを使用しても良い。
又，第３図に示されるように，第１図の１個のダイオー
ドD1の代わりに，コンデンサＣの両端子間に４個のダイ
オードD1,D2,D3及びD4からなるブリッジ整流器を接続し
ても良い。又，第３図のダイオードD1,D2,D3及びD4の代
わりに，第４図に示されるように，ツェナーダイオード
ZD1,ZD2,ZD3及びZD4を用いても良い。又，上述した実施
例の整流回路の代わりに，他の整流回路を使用しても良
いのは言うまでもない。Needless to say, the present invention is not limited to the above embodiment. For example, as shown in FIG. 2, a transistor Tr may be used instead of the diode D 1 in FIG.
Also, as shown in FIG. 3, instead of the single diode D 1 of FIG. 1 , a bridge consisting of four diodes D 1 , D 2 , D 3 and D 4 is placed between both terminals of the capacitor C. A rectifier may be connected. Also, instead of the diodes D 1 , D 2 , D 3 and D 4 of FIG. 3, as shown in FIG.
ZD 1 , ZD 2 , ZD 3 and ZD 4 may be used. Further, it goes without saying that other rectifier circuits may be used instead of the rectifier circuits of the above-described embodiments.
以上の説明で明らかなように，本発明によれば，ギャ
ップを持った磁気コアに巻回された巻線の両端子間に整
流回路を接続するという簡単な構造で，磁気カード等の
磁気記録媒体へのデータの書込みを防止することができ
る。従って，本発明による消去専用磁気ヘッド回路は，
磁気カードの偽造防止に大きな効果を発揮する。As is clear from the above description, according to the present invention, the magnetic recording of a magnetic card or the like can be performed with a simple structure in which a rectifying circuit is connected between both terminals of a winding wound around a magnetic core having a gap. It is possible to prevent the writing of data on the medium. Therefore, the erase-only magnetic head circuit according to the present invention is
Greatly effective in preventing forgery of magnetic cards.
第１図は本発明の第１の実施例を示す回路図，第２図は
本発明の第２の実施例を示す回路図，第３図は本発明の
第３の実施例を示す回路図，第４図は本発明の第４の実
施例を示す回路図である。 １……磁気コア,2……巻線,3……整流回路。1 is a circuit diagram showing a first embodiment of the present invention, FIG. 2 is a circuit diagram showing a second embodiment of the present invention, and FIG. 3 is a circuit diagram showing a third embodiment of the present invention. , FIG. 4 is a circuit diagram showing a fourth embodiment of the present invention. 1 ... Magnetic core, 2 ... Winding, 3 ... Rectifier circuit.
Claims (3)
巻回された巻線とを有する磁気ヘッドにおいて，前記巻
線の両端子間に整流回路を接続したことを特徴とする消
去専用磁気ヘッド回路。A magnetic head having a magnetic core having a gap and a winding wound around the magnetic core, wherein a rectifying circuit is connected between both terminals of the winding, and an erase-only magnetic field. Head circuit.
続されたコンデンサと前記巻線の一方の端子に接続され
たダイオードを含む特許請求の範囲第１項記載の消去専
用磁気ヘッド回路。2. The erase-only magnetic head according to claim 1, wherein the rectifier circuit includes a capacitor connected between both terminals of the winding and a diode connected to one terminal of the winding. circuit.
続されたコンデンサと該コンデンサの両端子間に接続さ
れたブリッジ整流器を含む特許請求の範囲第１項記載の
消去専用磁気ヘッド回路。3. The erase-only magnetic head according to claim 1, wherein the rectifier circuit includes a capacitor connected between both terminals of the winding and a bridge rectifier connected between both terminals of the capacitor. circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63010864A JP2535198B2 (en) | 1988-01-22 | 1988-01-22 | Erase-only magnetic head circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63010864A JP2535198B2 (en) | 1988-01-22 | 1988-01-22 | Erase-only magnetic head circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01189002A JPH01189002A (en) | 1989-07-28 |
| JP2535198B2 true JP2535198B2 (en) | 1996-09-18 |
Family
ID=11762220
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63010864A Expired - Lifetime JP2535198B2 (en) | 1988-01-22 | 1988-01-22 | Erase-only magnetic head circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2535198B2 (en) |
-
1988
- 1988-01-22 JP JP63010864A patent/JP2535198B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01189002A (en) | 1989-07-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| EXPY | Cancellation because of completion of term | ||
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