JPS5977609A - Magnetic reader - Google Patents
Magnetic readerInfo
- Publication number
- JPS5977609A JPS5977609A JP18682582A JP18682582A JPS5977609A JP S5977609 A JPS5977609 A JP S5977609A JP 18682582 A JP18682582 A JP 18682582A JP 18682582 A JP18682582 A JP 18682582A JP S5977609 A JPS5977609 A JP S5977609A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- magnetic
- reference voltage
- peak value
- clock
- 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.)
- Pending
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
- G11B20/10—Digital recording or reproducing
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Digital Magnetic Recording (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は磁気記録媒体から情報を読取る磁気読取シ装置
に関する。本発明による装置は、例えば金融機関、流通
機関等の端末機に多く使用される磁気カードの読取シ装
置に用いられる。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic reader that reads information from a magnetic recording medium. The device according to the present invention is used, for example, in a magnetic card reading device often used in terminals of financial institutions, distribution institutions, and the like.
周知の如く、磁気読取り装置は、磁気カード、磁気ディ
スク、磁気テープ等の磁気記録媒体に格納される情報を
読取るだめの装置である。一方、磁気記録媒体への記録
方式として代表的なものに位相変調方式、周波数変調方
式等があシ、これらの方式によって記録密度は異なシさ
らに記録媒体の移動速度も種々採用されているが、この
従来の磁気読取シ装置には種々の問題点を有している。As is well known, a magnetic reader is a device for reading information stored on magnetic recording media such as magnetic cards, magnetic disks, and magnetic tapes. On the other hand, typical recording methods for magnetic recording media include phase modulation, frequency modulation, etc., and these methods have different recording densities and different speeds of movement of the recording medium. This conventional magnetic reading device has various problems.
すなわち、第１図に従来の回路の一例を示すが、■、磁
気ヘッド１．１′のインピーダンスは磁気記録媒体の移
動速度、データの記録密度等によシ数百オームないし数
千オームの範囲で変化し、出力電圧は数ミリボルトない
し数十ミリボルトの範囲で変化するが、磁気テープ、磁
気ディスクの如き定速の移動速度が確保できない磁気カ
ードの場合には、電圧増幅器２，２′のインピーダンス
整合が十分に得られず、また再生周波数特性の大幅な変
動に対して十分に追従しきれず、さらに電圧増幅器２，
２′はその入力インピーダンスが極めて高いために外部
誘導を受は易い。■、積分回路３，３′を使用している
ために抵抗、コンデンサ等の部品点数が非常に多く回路
を複雑化しておシ、従って電圧変動、温度変化の影響を
受り易く、また電圧増幅器２，２′との間および終段の
コンパレータとの間を、オフセット電圧のドリフトの影
響を防止するだめのコンデンサによる交流結合としてい
るのでビットパターンによシ直流ベース電圧が変動し符
号量干渉を生じ易い。さらに抵抗とコンデンサにより決
定される積分定数を大きく設定すれば出力電圧が小さく
なυ、小さく設定すれば出力波形にだれを生じてしまい
従って磁気カードの移動速度の範囲を制約してしまい、
さらにバイアス電流の温度による変動を補正するために
ダイオードを必要とする、というような問題点があシ、
そのため特に手動式の磁気カードによる胱取り装置とし
て十分な性能が得られていなかった。That is, an example of a conventional circuit is shown in Fig. 1, but the impedance of the magnetic head 1.1' is in the range of several hundred ohms to several thousand ohms, depending on the moving speed of the magnetic recording medium, the data recording density, etc. The output voltage varies in the range of several millivolts to several tens of millivolts, but in the case of magnetic cards such as magnetic tapes and magnetic disks that cannot secure a constant moving speed, the impedance of the voltage amplifiers 2 and 2' In addition, the voltage amplifier 2,
2' has an extremely high input impedance and is therefore easily susceptible to external induction. ■Since the integration circuits 3 and 3' are used, the number of components such as resistors and capacitors is extremely large, making the circuit complicated. Therefore, it is easily affected by voltage fluctuations and temperature changes, and the voltage amplifier 2, 2' and the final stage comparator are connected by AC coupling using capacitors to prevent the influence of offset voltage drift, so the DC base voltage fluctuates depending on the bit pattern and code amount interference occurs. Easy to occur. Furthermore, if the integral constant determined by the resistor and capacitor is set to a large value, the output voltage will be small, υ, and if it is set to a small value, a droop will occur in the output waveform, thus restricting the range of movement speed of the magnetic card.
Furthermore, there are problems such as the need for a diode to compensate for variations in bias current due to temperature.
Therefore, sufficient performance has not been achieved especially as a manual magnetic card-based bladder removal device.
本発明の目的は上述の問題点に鑑み、手動式の磁気カー
ドの読取シにあっても十分に対応し得る、部品点数が少
く外部環境条件の変化にも十分に信頼性がち９、かつ容
易に集積回路化し得る磁気読取シ装置を提供することに
ある。SUMMARY OF THE INVENTION In view of the above-mentioned problems, an object of the present invention is to provide a system that can sufficiently cope with manual magnetic card reading systems, has a small number of parts, is sufficiently reliable even under changes in external environmental conditions, and is easy to use. An object of the present invention is to provide a magnetic reading device that can be integrated into a circuit.
以下本発明による磁気ｖＣ１取り装置を図面に従りて詳
細に説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS The magnetic vC1 collecting device according to the present invention will be explained in detail below with reference to the drawings.
第２図ｉ１本発明による磁気５取り装置の一実施例を示
す回路図である。第２図において、５．５’はクロック
およびデータ磁気ヘッド、６ 、６’は電流増幅器、７
，７′はウィンドコンパレータ、８゜８′はクリップ・
フロップ回路を示す。図に示すようにクロック磁気ヘッ
ド５により取り出された情報をクロック出力するケロッ
クチャンネルと、データ磁気ヘッド５′により取シ出さ
れた情報をデータ出力するデータチャンネルにより４１
４成されるが、説明はクロックチャンネル仙］について
行なうものとし、データチャンネル側はそれにより同様
に理解される このような構成においで、磁気ヘッド５
によυ取υ出された↑ａ報は第３図（イ）の如き出力電
流波形を示す。この出力−流は電流増幅器６により所定
のレベルまで霜、流増幅される。一方電流増幅器６とウ
ィンドコンパレータ７との間には図に示すように抵抗Ｒ
１ｒ Ｒ３、Ｒ４ｖ Ｒ５ｔおよびＲ６が介在し、ｎ、
ｔ Ｒ４＊ Ｒ１＋の共通接点を３％ Ｒ１１とＲ６
の共通接点をｂＸＲｌ とＲ４の共通接点をＣとし、点
ａ、ｂおよびＣにおける電圧を各々ＶＲＥＦ Ｉ 、Ｖ
ＲＩＤＦ ２およびＶＲＥ’！Ｆ ３ 七すると、これ
らの関係は、
５
ＶＲＥＦ３＝
−ＥＲ１十Ｒ４＋Ｒ，十Ｒ。FIG. 2 i1 is a circuit diagram showing an embodiment of the magnetic 5-pickup device according to the present invention. In FIG. 2, 5.5' is a clock and data magnetic head, 6 and 6' are current amplifiers, and 7
, 7' is a window comparator, 8°8' is a clip.
A flop circuit is shown. As shown in the figure, there are 41 channels including a Kerok channel for clock outputting the information extracted by the clock magnetic head 5 and a data channel for outputting the information extracted by the data magnetic head 5'.
4, but the explanation will be based on the clock channel side, and the data channel side will be understood in the same way.In such a configuration, the magnetic head 5
The output ↑a signal shows the output current waveform as shown in Fig. 3 (a). This output current is amplified to a predetermined level by a current amplifier 6. On the other hand, a resistor R is connected between the current amplifier 6 and the window comparator 7 as shown in the figure.
1r R3, R4v R5t and R6 intervene, n,
t R4* 3% common contact of R1+ R11 and R6
The common contact of bXRl and R4 is C, and the voltages at points a, b and C are VREF I and V, respectively
RIDF 2 and VRE'! F 3 7 Then these relationships are: 5 VREF3=
-ER1 10R4+R, 10R.
で示され、Ｒ３＝Ｒ１１，）尤＋＝Ｒａと設定するとＶ
ＲＥＦＩ ＝ Ｅ／２ と示される（Ｅは電源涌、圧
）。When R3=R11,)+=Ra is set, V
It is shown as REFI = E/2 (E is the power supply, pressure).
ＶＲＫＦＩ を基準値とし土限矩１圧ＶＲＥＦ２を上
限基準πを圧および下限電圧ＶＲＩＦ３を下限児・準電
圧として設定すると、第３図１（ロ）に示すように電流
増幅器６の出力はウィンドコンパレータ７において、不
感’ｉｉ￥ Ｖ’ＲＫＦ ２〜ＶＪｔＲ：Ｆ ｓ ノ上
限オヨＤ 下Ｖ’Ｒｕ 単重、圧ＶＲＲ１ｉＦ２および
ＶＲＫＦｓを越える正の尖頭値および負の尖頭値のみを
取シ出すことができる。この波形は第３図（ハ）、に）
に示すようにコンパレータ７１では（ハ）のように正の
尖頭値を示すパルスを、コンパレータ７２ではに）に示
すように伯の尖頭値を示すパルスを得ることができる。When VRKFI is set as the reference value, the earth limit rectangular voltage VREF2 is set as the upper limit reference π, and the lower limit voltage VRIF3 is set as the lower limit/quasi voltage, the output of the current amplifier 6 is set as the window comparator as shown in Fig. 3 (b). 7, take out only the positive peak values and negative peak values that exceed the insensitivity 'ii\ V'RKF 2 ~ VJtR: F s no upper limit Oyo D lower V'Ru unit weight, pressure VRR1iF2 and VRKFs. I can do it. This waveform is shown in Figure 3 (c) and
As shown in (c), the comparator 71 can obtain a pulse that shows a positive peak value as shown in (c), and the comparator 72 can obtain a pulse that shows a positive peak value as shown in (b).
これらのパルスはクリップ・フロップ回路８のセット（
Ｓ）およびリセッ） （Ｒ）にそれぞれ送出さＪｌ、フ
リップ・フロップ回路８は第３図（ホ）に示すような波
形を出力する。この出力は適切なデコーダ（図示せず）
に入力され復号化される。These pulses are sent to a set of clip-flop circuits 8 (
The flip-flop circuit 8 outputs a waveform as shown in FIG. 3(E). This output is connected to a suitable decoder (not shown)
is input and decoded.
本発明によって、電流増幅器として使用するために入力
インピーダンスを低くすることができ子のため誘導雑音
と同枦雑音を除去することができ雑音による誤りパルス
を発生することも回避できる。寸た積分回路を除去した
だめに符号量干渉がなくなり、再生周波数の範囲も七し
く拡大され手動式磁気カードにおける再生周波数に十分
対応できる。本発明の装置による磁気カードの読取り速
度は２〜２００ ｃｍ／ ｓｅｃ （従来は５〜８０
ｃｍ ／ ｓｅｃ ）まで可能である。前述したように
積分回路を除去したことにより部品点数が大幅に減少し
、また温度補正も不要であり混成集積回路化も容易であ
る。According to the present invention, since the input impedance can be lowered for use as a current amplifier, it is possible to eliminate inductive noise and similar noise, and it is also possible to avoid generation of erroneous pulses due to noise. By removing the small integration circuit, code amount interference is eliminated, and the reproduction frequency range is expanded seven times, making it fully compatible with the reproduction frequency of manual magnetic cards. The reading speed of magnetic cards by the device of the present invention is 2 to 200 cm/sec (previously 5 to 80 cm/sec).
cm/sec). As mentioned above, the number of parts is greatly reduced by eliminating the integrating circuit, and temperature correction is not required, making it easy to form a hybrid integrated circuit.
第１図は、従来の磁気読取シ装置の回路図、第２図は、
本発明による磁気読取り装色の一実ｈ１！１例を示す回
路図、および
第３図は、卯、２図に示す回路の各点における波形図で
ある。
（符号の説明）
５．５′・・・磁気ヘッド
６．６′・・・電流増幅器
’ｔ 、 ７’・・・ウィンドコンパレータ８．８′・
・・クリップ・フロップ回路將許出願人
日本恰備保障株式会社
特許出願代理人
弁理士 青 木 朗
弁理士西舘和之
弁理士山口昭之Fig. 1 is a circuit diagram of a conventional magnetic reading device, and Fig. 2 is a circuit diagram of a conventional magnetic reading device.
A circuit diagram showing an example of magnetic reading coloring according to the present invention h1!1, and FIG. 3 are waveform diagrams at each point of the circuit shown in FIG. (Explanation of symbols) 5.5'...Magnetic head 6.6'...Current amplifier 't, 7'...Window comparator 8.8'.
...Clip-flop circuit patent applicant Nippon Keibisho Co., Ltd. Patent application agent Akira Aoki Patent attorney Kazuyuki Nishitate Patent attorney Akiyuki Yamaguchi
Claims (1)
おいて、磁気ヘッドの出力電流を増幅する電流増幅器、
該電流増幅器の出力電圧に所定の不感帯を設け、該不感
帯の上限電圧を上限基準電圧として該上限基準電圧を越
える正の尖頭値と該不感帯の下限電圧を下限基準電圧と
して該下限基準電圧を越える負の尖頭値とを出力するウ
ィンドコンパレータ、および該ウィンドコンパレータに
応答してセットおよびリセットし方形波を発生するフリ
ップ・フロップ回路、を具備することを特徴とする磁気
読取り装置。1. In a magnetic reading device that reads information from a magnetic recording medium, a current amplifier that amplifies the output current of the magnetic head;
A predetermined dead band is provided in the output voltage of the current amplifier, and the upper limit voltage of the dead band is set as the upper limit reference voltage, and the positive peak value exceeding the upper limit reference voltage is set as the lower limit voltage of the dead band, and the lower limit reference voltage is set as the lower limit voltage of the dead band. 1. A magnetic reading device comprising: a window comparator that outputs a negative peak value that exceeds the peak value; and a flip-flop circuit that sets and resets in response to the wind comparator to generate a square wave.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18682582A JPS5977609A (en) | 1982-10-26 | 1982-10-26 | Magnetic reader |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18682582A JPS5977609A (en) | 1982-10-26 | 1982-10-26 | Magnetic reader |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5977609A true JPS5977609A (en) | 1984-05-04 |
Family
ID=16195265
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18682582A Pending JPS5977609A (en) | 1982-10-26 | 1982-10-26 | Magnetic reader |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5977609A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5030510A (en) * | 1973-06-25 | 1975-03-26 | ||
| JPS57141108A (en) * | 1981-01-23 | 1982-09-01 | Sony Corp | Current mode preamplifier |
-
1982
- 1982-10-26 JP JP18682582A patent/JPS5977609A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5030510A (en) * | 1973-06-25 | 1975-03-26 | ||
| JPS57141108A (en) * | 1981-01-23 | 1982-09-01 | Sony Corp | Current mode preamplifier |
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