JPH04195811A - Magnetic image sensor - Google Patents
Magnetic image sensorInfo
- Publication number
- JPH04195811A JPH04195811A JP2322964A JP32296490A JPH04195811A JP H04195811 A JPH04195811 A JP H04195811A JP 2322964 A JP2322964 A JP 2322964A JP 32296490 A JP32296490 A JP 32296490A JP H04195811 A JPH04195811 A JP H04195811A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- magnetic field
- wire
- image sensor
- exciting
- 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
- 230000005284 excitation Effects 0.000 claims description 32
- 230000005415 magnetization Effects 0.000 claims description 16
- 238000001514 detection method Methods 0.000 abstract description 14
- 238000004804 winding Methods 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 238000003491 array Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 230000004907 flux Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000010408 sweeping Methods 0.000 description 1
Landscapes
- Measuring Magnetic Variables (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明はコンピュータ等に用いられる磁気カードの読み
取り、紙幣の磁気インク等の磁界を一次元イメージとし
て読み取るためのイメージセンサに関し、特に媒体を搬
送することにより、２次元の磁気イメージを容易に取り
こむことを可能にしたものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an image sensor for reading magnetic cards used in computers, etc., and for reading the magnetic field of magnetic ink on banknotes as a one-dimensional image, and particularly relates to an image sensor for reading magnetic fields such as magnetic ink on banknotes as a one-dimensional image. This makes it possible to easily capture two-dimensional magnetic images.
従来、磁気カー１−等の多トラツクの磁気情報や、面状
に存在する磁性体の発生する磁界を検出する場合、多チ
ャンネルのギャップ式磁気ヘッド、磁気抵抗素子アレイ
、ホール素子アレイ等が用いられていたが価格的にも高
いものであり、検出回路も多チャンネル分を必要とし、
回路量も大きなものになる等の欠点があった。Conventionally, multi-channel gap type magnetic heads, magnetoresistive element arrays, Hall element arrays, etc. have been used to detect multi-track magnetic information such as magnetic cars 1- or magnetic fields generated by planar magnetic materials. However, it was expensive and required a large number of detection circuits.
There were drawbacks such as a large amount of circuitry.
この種の装置として関連するものには、例えば特開昭６
２−５４８７１号がある。Related devices of this type include, for example, Japanese Patent Application Laid-open No. 6
There is No. 2-54871.
本発明は、従来の磁気センサアレイが、小形の磁気セン
サを多数並べることにより実現していた、−次元°磁気
イメージセンサ機能を同じものを小さくして並べる手法
によらず、全く異なる動作原理で動く、零〜負磁歪係数
を持つ磁性ワイアに円周方向の磁化を与えたものの内部
磁化反転時のパルス４８号を外部磁界で変調することに
より、１つの検出回路で多チャンネル分に分割された磁
界を検出させることにある。The present invention achieves the -dimensional magnetic image sensor function by arranging a large number of small magnetic sensors in a conventional magnetic sensor array, but by using a completely different operating principle. A moving magnetic wire with a zero to negative magnetostriction coefficient is magnetized in the circumferential direction, but by modulating pulse No. 48 at the time of internal magnetization reversal with an external magnetic field, it can be divided into multiple channels with one detection circuit. The purpose is to detect magnetic fields.
零〜負磁歪係数の磁性ワイアに円周方向の磁化を発生さ
せ、それに励振コイルにより励振磁界をかけると励振磁
界の強さに応して、円周方向磁化反転時のパルス電圧が
発生する。このとき励振磁界の他に、外部磁界があると
、磁化反転時のパルス電圧は励振磁界と外部磁界両者の
影響を受ける。When circumferential magnetization is generated in a magnetic wire with a zero to negative magnetostriction coefficient and an excitation magnetic field is applied to it by an excitation coil, a pulse voltage is generated when the circumferential magnetization is reversed depending on the strength of the excitation magnetic field. At this time, if there is an external magnetic field in addition to the excitation magnetic field, the pulse voltage at the time of magnetization reversal is influenced by both the excitation magnetic field and the external magnetic field.
よって励振磁界を予め定められた値にしておけば、磁化
反転時のパルス電圧のうちの所定量を差し引くことによ
り、外部磁界の強さが検出できる。また励振コイルを分
割して配置し、スイッチにより順次切り換えることによ
り、各々該当する励振コイル近辺の外部磁界が検出でき
ることになり、磁気イメージセンサが実現できる。Therefore, if the excitation magnetic field is set to a predetermined value, the strength of the external magnetic field can be detected by subtracting a predetermined amount of the pulse voltage at the time of magnetization reversal. In addition, by arranging the excitation coils separately and switching them sequentially using a switch, the external magnetic field in the vicinity of each corresponding excitation coil can be detected, and a magnetic image sensor can be realized.
零〜負磁歪係数の磁性ワイアに円周方向の磁化を与える
方法としては磁性ワイアに適度なひねりを与えることに
より実現できる。A method of imparting circumferential magnetization to a magnetic wire having a zero to negative magnetostriction coefficient can be achieved by imparting an appropriate twist to the magnetic wire.
〔作用〕
零〜負の磁歪係数を持つ磁性ワイアにひねりを与える等
の方法により円周方向の磁化を与えたものは、外部磁界
がある一定値を越えたとき、磁化の反転を起こし、この
とき、磁束をφとしたときの−ｄφ／ｄｔに比例した電
圧を発生する。よってこの磁性ワイアを励振したとき、
磁性ワイア両端には磁化反転時のパルス電圧が発生する
。゛ここで磁性ワイアの近辺に励振コイルによる磁界以
外の磁界が存在した場合、磁性ワイアには両者の合成さ
れた磁界が加わることとなり、合成された磁界により、
内部磁化の反転が起こる。すなわち、外部磁界は励振磁
界をキャリアとしたときの変調信号として働き、磁化反
転による信号の処理により外部磁界の分離検出が行なわ
れる。外部磁界を高分解能で検出させるためには励振磁
界の範囲を狭くすれば良く、フェライト等により巻線を
行なったもので実現することが出来る。[Effect] When a magnetic wire with a magnetostriction coefficient of zero to negative is magnetized in the circumferential direction by a method such as twisting, when the external magnetic field exceeds a certain value, the magnetization is reversed and this When the magnetic flux is φ, a voltage proportional to -dφ/dt is generated. Therefore, when this magnetic wire is excited,
A pulse voltage is generated at both ends of the magnetic wire at the time of magnetization reversal.゛Here, if a magnetic field other than the magnetic field from the excitation coil exists near the magnetic wire, the combined magnetic field of both will be applied to the magnetic wire, and the combined magnetic field will cause
A reversal of internal magnetization occurs. That is, the external magnetic field acts as a modulation signal when the excitation magnetic field is used as a carrier, and the external magnetic field is separated and detected by processing the signal by magnetization reversal. In order to detect the external magnetic field with high resolution, it is sufficient to narrow the range of the excitation magnetic field, and this can be achieved by winding wires with ferrite or the like.
本発明による磁気イメージセンサの構成を図１に示す。 FIG. 1 shows the configuration of a magnetic image sensor according to the present invention.
磁気イメージセンサは検出体である磁性ワイア］、該ワ
イア１に局部的な励振磁界を与える１つ以上の励振コイ
ル３．励振コイル各々の巻線４に流れる励振電流を切り
換えるための切換えスイッチ５．励振電流を供給する発
振器６から成る。A magnetic image sensor has a magnetic wire as a detecting object], one or more excitation coils 3 which provide a local excitation magnetic field to the wire 1; A changeover switch 5 for switching the excitation current flowing through the winding 4 of each excitation coil. It consists of an oscillator 6 that supplies excitation current.
図１の磁気イメージセンサの検出ユニットは図２に示す
が、磁性ワイア１の内部には図示のように円周方向の磁
化が起こしである。The detection unit of the magnetic image sensor of FIG. 1 is shown in FIG. 2, and the inside of the magnetic wire 1 is magnetized in the circumferential direction as shown.
これは、励振コイル３の励振磁界により内部磁化の方向
が反転し、このとき端子２．ＡＢ間にパルス状の電圧を
発生する。この様子を図４に示す。This is because the direction of internal magnetization is reversed by the excitation magnetic field of the excitation coil 3, and at this time the direction of the internal magnetization is reversed by the excitation magnetic field of the excitation coil 3. A pulse voltage is generated between AB. This situation is shown in FIG.
検出信号は励振電流毎励振磁界の位相に対応した位相で
パルスを発生する。しかしここで励振磁界以外の外部磁
界が存在すると磁性ワイアｌ内部の磁化の一部にあらか
じめ方向変化を生じ励振磁界の印加によって端子Ａ、Ｂ
にパルス電圧を生じない状態となる。すなわち、外部磁
界により検出信号の大きさが変調されることとなる。こ
の原理により磁性ワイア１にはパルス電圧が発生するが
。The detection signal generates a pulse with a phase corresponding to the phase of the excitation magnetic field for each excitation current. However, if an external magnetic field other than the excitation magnetic field is present, a part of the magnetization inside the magnetic wire l will change direction in advance, and the application of the excitation magnetic field will cause the terminals A and B to change direction.
The state is such that no pulse voltage is generated. That is, the magnitude of the detection signal is modulated by the external magnetic field. Due to this principle, a pulse voltage is generated in the magnetic wire 1.
外部磁界により変調を受けるのは各励振された磁性ワイ
ア１の部分であり他の部分は変調されない。It is the portion of each excited magnetic wire 1 that is modulated by the external magnetic field, and the other portions are not modulated.
よって励振コイル３を分割することにより磁気イメージ
センサとしての分解能を上げることが可能である。励振
コイル３の実現方法としてはフェライト捧に巻線をした
ももの他、銅貼積層板（プリント基板）を多層にするこ
とにより基板上のパターン（うす巻き状等）としても実
現が可能である。Therefore, by dividing the excitation coil 3, it is possible to increase the resolution of the magnetic image sensor. The excitation coil 3 can be realized by winding a wire around a ferrite core, or by using a multi-layered copper-clad laminate (printed circuit board) as a pattern (thinly wound, etc.) on the board. .
励振コイル３を分割することによりこれらを順次励振す
ることにより感度を持つ部位が移動するため、磁傑イメ
ージセンサが実現される。励振電流は設計によっては数
１０ｍＡ以下であるため、切換スイッチ５としては一般
のアナログスイッチ等が利用可能である。By dividing the excitation coil 3 and sequentially exciting them, a sensitive part moves, so that a magnet image sensor is realized. Since the excitation current is several tens of mA or less depending on the design, a general analog switch or the like can be used as the changeover switch 5.
図３は図１でもη成される磁気イメージセンサの動作信
号を示したものであり、Ｃ】〜Ｃ６のＣ１〜Ｃ４を示す
が励振信号は順次切り換えられてゆく。FIG. 3 shows the operating signals of the magnetic image sensor which are also formed in FIG.
この時、各励振コイル付近の外部磁界により検出信号は
変調を受け、図３Ａ−Ｂ間検出信号のような振幅の変調
された検出信号となってあられれる。At this time, the detection signal is modulated by the external magnetic field near each excitation coil, resulting in an amplitude-modulated detection signal like the detection signal between A and B in FIG.
磁性ワイアとしては零〜負の磁歪係数の磁性ワイアを用
いた場合、円周方向の磁化が起こしやすく、特にワイア
を１タ一ン／１０’ｃｍ程度の割合でひねりを加えるこ
とにより磁化が安定する。When using a magnetic wire with a magnetostriction coefficient of zero to negative, magnetization tends to occur in the circumferential direction, and magnetization is stabilized by twisting the wire at a rate of about 1 turn/10'cm. do.
本発明により精密な巻線作業、磁気コアの精密加工、半
導体技術を用いずに、広い範囲を必要な分解能で検出可
能な磁気イメージセンサが実現できる。また掃造は他の
ものに比し極めて単純なものとなりコストダウンが容易
である。また動作原理が静止読み取りであり、検出媒体
の移動速度に依存しない。According to the present invention, a magnetic image sensor capable of detecting a wide range with the necessary resolution can be realized without using precise winding work, precision machining of the magnetic core, or semiconductor technology. In addition, sweeping is extremely simple compared to other methods, making it easy to reduce costs. Furthermore, the operating principle is stationary reading and does not depend on the moving speed of the detection medium.
第１図は、本発明による磁気イメージセンサの構成図で
ある。
第２図は、本磁気イメージセンサの検出ユニットの概念
図である。
第３図は、磁気イメージセンサ検出信号のタイミング図
である。
第４図は、同検出信号のタイミング拡大図である。
１・・磁性ワイア、 ２・・・端子。
３・・・励振コイル、 ４・・・巻線
。
５・・・切換スイッチ、 ６・・・発振器
。FIG. 1 is a block diagram of a magnetic image sensor according to the present invention. FIG. 2 is a conceptual diagram of the detection unit of the present magnetic image sensor. FIG. 3 is a timing diagram of magnetic image sensor detection signals. FIG. 4 is an enlarged timing diagram of the detection signal. 1...Magnetic wire, 2...Terminal. 3... Excitation coil, 4... Winding wire. 5... Selector switch, 6... Oscillator.
Claims (1)
アに分割して磁界を与える励振コイルから成り外部磁界
の検出を行なう磁気イメージセンサにおいて、励振コイ
ルを順次切り換えることにより、磁性ワイアに発生する
磁性ワイア内部の磁化反転によるパルス電圧が、各励振
コイル近辺の磁界により変調されるようにしたことを特
徴とする磁気イメージセンサ。1. In a magnetic image sensor that detects an external magnetic field, it consists of a magnetic wire with a zero or negative magnetostriction coefficient and an excitation coil that divides the wire and applies a magnetic field. A magnetic image sensor characterized in that a pulse voltage caused by magnetization reversal inside a magnetic wire is modulated by a magnetic field near each excitation coil.
Priority Applications (12)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32296490A JP2510781B2 (en) | 1990-11-28 | 1990-11-28 | Magnetic image sensor |
| DE69132528T DE69132528T2 (en) | 1990-11-28 | 1991-11-26 | Coordinate input device based on the Mateucci effect |
| KR1019910021190A KR960006091B1 (en) | 1990-11-28 | 1991-11-26 | Magnetic detector using mateucci effect |
| EP91120183A EP0488167B1 (en) | 1990-11-28 | 1991-11-26 | Magnetic detector based on Mateucci effect |
| DE69132101T DE69132101T2 (en) | 1990-11-28 | 1991-11-26 | Magnetic image sensor based on the Mateucci effect |
| US07/797,923 US5298689A (en) | 1990-11-28 | 1991-11-26 | Coordinate input device using Matteucci effect |
| EP95118295A EP0706057B1 (en) | 1990-11-28 | 1991-11-26 | Magnetic image sensor using Matteucci effect |
| EP96113405A EP0751398B1 (en) | 1990-11-28 | 1991-11-26 | Coordinate input device using Mateucci effect |
| DE69127530T DE69127530T2 (en) | 1990-11-28 | 1991-11-26 | Magnetic detector based on the Mateucci effect |
| US08/118,764 US5446377A (en) | 1990-11-28 | 1993-09-10 | Magnetic detector using Matteucci effect |
| KR1019950050863A KR960004556B1 (en) | 1990-11-28 | 1995-12-16 | Coordinates input device using mateuchi effect |
| KR1019950050864A KR960004557B1 (en) | 1990-11-28 | 1995-12-16 | Magnetic image sensor using mateuchi effect |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32296490A JP2510781B2 (en) | 1990-11-28 | 1990-11-28 | Magnetic image sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04195811A true JPH04195811A (en) | 1992-07-15 |
| JP2510781B2 JP2510781B2 (en) | 1996-06-26 |
Family
ID=18149615
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32296490A Expired - Lifetime JP2510781B2 (en) | 1990-11-28 | 1990-11-28 | Magnetic image sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2510781B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2012278A1 (en) | 2007-06-22 | 2009-01-07 | Hitachi-Omron Terminal Solutions, Corp. | Bill discrimination device and sensor for same |
| CN111292232A (en) * | 2018-12-06 | 2020-06-16 | 成都微晶景泰科技有限公司 | Lens array image splicing method and device and storage medium |
-
1990
- 1990-11-28 JP JP32296490A patent/JP2510781B2/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2012278A1 (en) | 2007-06-22 | 2009-01-07 | Hitachi-Omron Terminal Solutions, Corp. | Bill discrimination device and sensor for same |
| US7612558B2 (en) | 2007-06-22 | 2009-11-03 | Hitachi-Omron Terminal Solutions Corporation | Bill discrimination device and sensor for same |
| CN111292232A (en) * | 2018-12-06 | 2020-06-16 | 成都微晶景泰科技有限公司 | Lens array image splicing method and device and storage medium |
| CN111292232B (en) * | 2018-12-06 | 2023-08-15 | 成都微晶景泰科技有限公司 | Lens array image stitching method, device and storage medium |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2510781B2 (en) | 1996-06-26 |
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