JPS6022738B2 - position detection device - Google Patents
position detection deviceInfo
- Publication number
- JPS6022738B2 JPS6022738B2 JP54098070A JP9807079A JPS6022738B2 JP S6022738 B2 JPS6022738 B2 JP S6022738B2 JP 54098070 A JP54098070 A JP 54098070A JP 9807079 A JP9807079 A JP 9807079A JP S6022738 B2 JPS6022738 B2 JP S6022738B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- magnetoresistive element
- magnetic information
- moving
- lead wire
- 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
Links
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- Linear Or Angular Velocity Measurement And Their Indicating Devices (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
- Control Of Electric Motors In General (AREA)
Description
【発明の詳細な説明】
発明の利用分野
本発明は磁気センサとして磁気抵抗素子を用いた位置検
出装置に係り、特に検出感度を上げる場合に好適な磁気
抵抗素子の構成に関する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a position detection device using a magnetoresistive element as a magnetic sensor, and particularly to a configuration of a magnetoresistive element suitable for increasing detection sensitivity.
発明の背景
パーマロィのような磁気抵抗素子を、磁界中に近接して
電流を流すと、磁気抵抗素子の抵抗値が磁界に応じて変
化することが知られている。BACKGROUND OF THE INVENTION It is known that when a current is passed through a magnetoresistive element such as Permalloy in close proximity to a magnetic field, the resistance value of the magnetoresistive element changes in response to the magnetic field.
この原理を従来の磁気ヘッドの代わりに利用すると、磁
気記録媒体と磁気センサとの相対速度が零のとひき、つ
まり停止状態においても記録情報を検出することが可能
である。そのため、移動体、例えば回転体の回転位置、
つまり回転角度を検出する装置の磁気センサとして使用
できる。第４図はこのような磁気抵抗素子を磁気センサ
５として用いた回転位置検出装置の従来例を示すもので
ある。If this principle is used in place of a conventional magnetic head, it is possible to detect recorded information even when the relative velocity between the magnetic recording medium and the magnetic sensor is zero, that is, when the magnetic sensor is stopped. Therefore, the rotational position of a moving body, for example, a rotating body,
In other words, it can be used as a magnetic sensor for devices that detect rotation angles. FIG. 4 shows a conventional example of a rotational position detecting device using such a magnetoresistive element as the magnetic sensor 5. As shown in FIG.
円板状の磁気記録媒体１の上に記録されたＮ，Ｓの磁気
情報を磁気抵抗素子２により検出するように構成されて
いる。磁気抵抗素子２はリード線３の取付部Ｒ１，Ｒ２
および磁界を感じ０る検出部Ｒ３の部分で構成されてお
り、リード線取付部Ｒ１，Ｒ２には通常ハンダ仕上げで
リード線３を接続するようになっている。このときの断
面図を第４図のＢ−Ｂ線にそって描くと第５図のように
なる。第５図において、１は磁気記録媒体で、回転する
部分である。It is configured so that N and S magnetic information recorded on a disk-shaped magnetic recording medium 1 is detected by a magnetoresistive element 2. The magnetoresistive element 2 is attached to the mounting portions R1 and R2 of the lead wire 3.
and a detection part R3 that senses a magnetic field, and lead wires 3 are usually connected to lead wire attachment parts R1 and R2 by soldering. If the cross-sectional view at this time is drawn along line B--B in FIG. 4, it will become as shown in FIG. 5. In FIG. 5, 1 is a magnetic recording medium, which is a rotating part.
４は基板で、この上に磁気抵抗素子２が蒸着され、さら
にこの磁気抵抗素子２は保護膜６によりその表面が保護
されて磁気センサが構成されている。Reference numeral 4 denotes a substrate, on which a magnetoresistive element 2 is deposited, and the surface of this magnetoresistive element 2 is further protected by a protective film 6 to constitute a magnetic sensor.
このような磁気センサにおいて、検出部Ｒ３が磁束を検
出する部分であり、この部分を磁気記録媒体１に近づけ
れば近づけるほど検出感度を向上できる。しかし、リー
ド線３の敬付部Ｒ１，，Ｒ２にハンダ付けをすると、通
常ハンダ５が図示のように盛り上がる。そのため、一方
のリード線取付部ＲＩの方は磁気記録媒体１の外周側の
ギャップから外れた位置にあるので問題はないが、他方
のリード線取付部Ｒ２の部分はギャップ内に位置してい
るのでハンダ５の厚みだけギャップｇを大きくしなけれ
ばならないという欠点があった。発明の目的
本発明の目的は、上託した従来技術の欠点をなくし、検
出感度を著しく向上し得るとともにリード線との接続作
業が容易な位置検出装置を提供するにある。In such a magnetic sensor, the detection part R3 is a part that detects magnetic flux, and the closer this part is to the magnetic recording medium 1, the more the detection sensitivity can be improved. However, when soldering is performed on the attached portions R1, R2 of the lead wire 3, the solder 5 usually swells as shown in the figure. Therefore, one lead wire attachment portion RI is located outside the gap on the outer circumferential side of the magnetic recording medium 1, so there is no problem, but the other lead wire attachment portion R2 is located within the gap. Therefore, there was a drawback that the gap g had to be increased by the thickness of the solder 5. OBJECTS OF THE INVENTION It is an object of the present invention to provide a position detection device that eliminates the drawbacks of the prior art, significantly improves detection sensitivity, and facilitates connection to lead wires.
発明の概要
この目的を達成するため、本発明は、磁気抵抗素子をそ
の中間部で折り返して少なくとも２つの部分で移動磁性
体に記録された磁気情報と交叉するようにするとともに
、各リード線取付部を移動磁性体の磁気情報記録面と磁
気センサの基体の磁気抵抗素子設置面との対向ギャップ
外でかつ同一側に配置し、さらに磁気抵抗素子の磁気情
報と交叉する一方の部分を幅狭の検出部とし、他方の部
分を幅広のわたり部としたことを特徴とする。SUMMARY OF THE INVENTION To achieve this objective, the present invention provides a magnetoresistive element that is folded in its middle so that at least two parts intersect magnetic information recorded on a moving magnetic body, and that each lead wire attachment The part is arranged on the same side and outside the opposing gap between the magnetic information recording surface of the moving magnetic body and the magnetoresistive element installation surface of the base of the magnetic sensor, and one part that intersects with the magnetic information of the magnetoresistive element is narrowed. , and the other part is a wide crossing part.
発明の実施例以下、本発明の実施例を第１図〜第３図に
ついて説明する。Embodiments of the Invention Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 3.
第１図において、記録媒体１に記録された磁気情報は一
定の波長＾のデジタル信号で、磁気抵抗素子２は記録媒
体１の内側で折り返されてコ字状となり、そのリード線
取付部Ｒ１，Ｒ２がいずれも記録媒体１の外側、つまり
記録媒体１の磁気情報記録面と基板４の磁気抵抗素子設
置面との間の対向ギャップｇの外に設置されている。In FIG. 1, the magnetic information recorded on the recording medium 1 is a digital signal of a certain wavelength, and the magnetoresistive element 2 is folded back inside the recording medium 1 to form a U-shape, and the lead wire attachment portion R1, Both R2 are installed outside the recording medium 1, that is, outside the facing gap g between the magnetic information recording surface of the recording medium 1 and the magnetoresistive element installation surface of the substrate 4.
また、折り返された一方の部分のみが幅狭の検出部Ｒ３
となり、他方の部分は幅広のわたり部分Ｒ４となってお
り「かつこれらの間は幅広のわたり部Ｒ５で接続されて
いる。磁気抵抗素子２は、第２図および第３図に示すよ
うに、基板４の上に蒸着され、その上に保護膜６が被覆
されている。In addition, only one folded portion has a narrow detection portion R3.
The other part is a wide crossing part R4, and these parts are connected by a wide crossing part R5.The magnetoresistive element 2, as shown in FIGS. 2 and 3, It is deposited on a substrate 4, and a protective film 6 is coated thereon.
基板４は厚さ１肋のガラス基板で、磁気抵抗素子２はパ
ーマロィを２０瓜程度０の厚さに蒸着し、その上に保護
膜６として厚さ５０仏ｍ程度のカバーガラスを使用して
いる。この様に構成された磁気センサにおいて、基板４
はセンサの強度を保持し、かつ磁気抵抗素子２を蒸着す
る基板になっている。The substrate 4 is a glass substrate with a thickness of 1 rib, and the magnetoresistive element 2 is made by vapor-depositing permalloy to a thickness of about 20 mm, and using a cover glass with a thickness of about 50 mm as a protective film 6 thereon. There is. In the magnetic sensor configured in this way, the substrate 4
serves as a substrate that maintains the strength of the sensor and on which the magnetoresistive element 2 is deposited.
磁気抵抗素子２は記録媒体に託録された磁気情報を感知
する部分で、前述したように、一体に形成された、リー
ド線をハンダ付けするりード線取付部Ｒ１，Ｒ２と磁束
を検知する検出部Ｒ３とわたり部Ｒ４，Ｒ５から礎成さ
れている。リード線取付部Ｒ１，Ｒ２はハンダ仕上げが
やり易いように幅広くなっている。さらに磁束を検出す
る検出部Ｒ３の幅は狭い程感度は上昇するが、逆に電流
密度の上限があり「出力は大きくならないので、記録密
度との関係から数十仏ｍ程度が良い。いま、リード線取
付部Ｒ１，Ｒ２の抵抗をｒｌ，ｒ２、検出部Ｒの抵抗を
ｒ３、わたり部Ｒ４，Ｒ５の抵抗をｒ４，ｒ５とすると
、記録磁気情報と交叉してその値が変化するのは検出部
Ｒ３の抵抗ｒ３とわたり部Ｒ４の抵抗ｒ４であり、この
ときの変化分を△ｒ３，△ｒ４とすると、△ｒ３が検出
すべき抵抗変化分であるのに対して、△ｒ４は検出感度
を悪くする誤差としての抵抗変化分であるから、検出感
度ｐは次のようになる。The magnetoresistive element 2 is a part that senses magnetic information recorded on a recording medium, and as described above, detects magnetic flux with the integrally formed lead wire attachment parts R1 and R2 to which the lead wires are soldered. It is made up of a detection section R3 and crossing sections R4 and R5. The lead wire attachment parts R1 and R2 are wide to facilitate soldering. Furthermore, the narrower the width of the detection part R3 that detects the magnetic flux, the higher the sensitivity will be, but on the other hand, there is an upper limit to the current density, and the output will not become large, so from the relationship with the recording density, it is better to have a width of several tens of meters. Assuming that the resistances of the lead wire attachment parts R1 and R2 are rl and r2, the resistance of the detection part R is r3, and the resistances of the crossing parts R4 and R5 are r4 and r5, their values change when intersecting with the recorded magnetic information. Resistance r3 of detection part R3 and resistance r4 of crossing part R4, and if the changes at this time are △r3 and △r4, △r3 is the resistance change that should be detected, while △r4 is the resistance change that should be detected. Since this is the resistance change as an error that deteriorates the sensitivity, the detection sensitivity p is as follows.
△ｒ３−△ｒ４Ｐ＝ｒｌ＋ｒ２十ｒ３十ｒ４十ｒ５
従って、この実施例のように、磁気抵抗素子２の検出部
Ｒ３の幅を狭くし、それ以外の部分、つまりリード線取
付部Ｒ１，Ｒ２およびわたり部Ｒ４，Ｒ５幅を広くして
、△ｒ３を広くし、ｒｌ，ｒ２，ｒ３，ｒ５，△ｒ４を
小さくすることにより、検出感度を上げることができる
。△r3-△r4P=rl+r20r30r40r5 Therefore, as in this embodiment, the width of the detection portion R3 of the magnetoresistive element 2 is narrowed, and the width of the other portions, that is, the lead wire attachment portions R1, R2, and The detection sensitivity can be increased by widening the widths of the crossing portions R4 and R5, widening Δr3, and decreasing rl, r2, r3, r5, and Δr4.
特に記録媒体の記録磁性情報と交叉するわたり部Ｒ４の
幅を広くすると、抵抗ｒ４を小さくできるばかりでなく
、検出誤差として作用する抵抗変化分△ｒ４をも小さく
できるので、極めて効果的に検出感度を上げることがで
きる。また、この実施例では、基板４の上に蒸着された
磁気抵抗素子２の各リード線取付部Ｒ１，Ｒ２はいずげ
も記録媒体１の外側、つまり対向ギャップｇの外にある
ので、ハンダ５が厚くなっても基板４の磁気抵抗設置面
と記録媒体１の磁気情報記録面との間の対向ギャップｇ
をほぼ磁気抵抗素子２の厚みに保護膜６の厚みを加えた
厚みまで４・さくすることが可能となり、磁気抵抗素子
２の検出部Ｒ３を記録媒体１の磁気情報記録面に十分接
近させて、さらに検出感度を上げることができる。In particular, by widening the width of the crossing portion R4 that intersects with the recorded magnetic information of the recording medium, not only can the resistance r4 be reduced, but also the resistance change △r4 that acts as a detection error can be reduced, which can extremely effectively improve the detection sensitivity. can be raised. Further, in this embodiment, since the lead wire attachment parts R1 and R2 of the magnetoresistive element 2 deposited on the substrate 4 are all located outside the recording medium 1, that is, outside the facing gap g, the solder 5 Even if the gap g between the magnetoresistive installation surface of the substrate 4 and the magnetic information recording surface of the recording medium 1 becomes thicker,
It is now possible to reduce the detection part R3 of the magnetoresistive element 2 sufficiently close to the magnetic information recording surface of the recording medium 1. , detection sensitivity can be further increased.
さらに、この実施例では、各リード線取付部Ｒ１，Ｒ２
がいずれも外側に、つまり同一側に配置されているため
、各リード線取付部Ｒ１，Ｒ２とりード線３との接続作
業を同一側より容易に行ない得てリード線との接続作業
性を向上することができる。なお、この実施例において
、わたり部Ｒ４の幅を、第１図に示すように、記録磁気
情報の波長入と等しくすれば、わたり部Ｒ４は記録磁気
情報と交叉しても、その各部分での記録磁気情報による
影響が相殺され、全体としては記録磁気情報に対して不
感となって、その検出誤差として作用する抵抗変化分△
ｒ４は零となり、さらに検出感度を上げることができる
。Furthermore, in this embodiment, each lead wire attachment part R1, R2
are arranged on the outside, that is, on the same side, so that the connection work between each lead wire attachment part R1 and R2 and the lead wire 3 can be easily performed from the same side, improving the workability of connecting the lead wires. can be improved. In addition, in this embodiment, if the width of the crossing portion R4 is made equal to the wavelength input of the recorded magnetic information as shown in FIG. The influence of the recorded magnetic information is canceled out, and the whole becomes insensitive to the recorded magnetic information, resulting in a resistance change △ that acts as a detection error.
r4 becomes zero, and the detection sensitivity can be further increased.
発明の効果
以上説明したように、本発明によれば、磁気抵抗素子を
その中間部で折り返して、その両端部の各リード線取付
部を、移動磁性体の磁気情報記録面と磁気センサの基体
の磁気抵抗設置面との間の対向ギャップ外に配置したの
で、ハンダなどの接続部の幅に関係なく前記対向ギャッ
プを小さくし、磁気抵抗素子の検出部を移動磁性体の磁
気情報記録面に接近させて、検出感度を上げることがで
きる。Effects of the Invention As explained above, according to the present invention, the magnetoresistive element is folded back at its middle part, and each lead wire attachment part at both ends is connected to the magnetic information recording surface of the moving magnetic body and the base of the magnetic sensor. Since it is placed outside the facing gap between the magnetoresistive installation surface of the magnetoresistive element, the facing gap can be made small regardless of the width of the connection part such as solder, and the detection part of the magnetoresistive element can be placed on the magnetic information recording surface of the moving magnetic material. By bringing them closer together, detection sensitivity can be increased.
また、折り返いこよって形成された磁気情報と交叉する
一方の部分である検出部の幅を狭くし、他方の部分であ
るわたり部の幅を広くしたので、検出部の抵抗変化分が
大きく、かつ前記わたり部の抵抗および抵抗変化分（検
出誤差として作用する）がいずれも小さくなって、この
点からも検出感度を上げることができる。さらに、各リ
ード線取付部を同一側に配置したので、各リード線との
接続作業を同一側より容易に行なうことができ、リード
線との接続作業性を向上することもできる。In addition, the width of the detection part, which is one part that intersects with the magnetic information formed by folding back, is narrowed, and the width of the other part, which is the crossing part, is made wide, so the resistance change of the detection part is large. In addition, the resistance of the crossing portion and the resistance change (which acts as a detection error) are both reduced, and detection sensitivity can also be increased from this point of view. Further, since the lead wire attachment portions are arranged on the same side, the work of connecting each lead wire can be easily performed from the same side, and the workability of connecting the lead wires can also be improved.
第１図ないし第３図は本発明の一実施例を示すもので、
第１図は回転位置検出装置の要部の展開平面図、第２図
は第１図のＡ−Ａ線に沿う断面図、第３図は磁気センサ
の分解斜視図であり、第４図および第５図は従来の回転
位置検出装置の一例を示す概略平面図および第４図のＢ
−Ｂ線に沿う断面図である。
１・・・・・・記録媒体（移動磁性体）、２・・・・・
・磁気抵抗素子、４・・・・・・基板（基体）、Ｒ１，
Ｒ２・・・・・・リード線取付部、Ｒ３…・・・検出部
、Ｒ４，Ｒ５・・・・・・わたり部、Ｎ，Ｓ・・・・・
・記録情報。
ナ’紅
才２図
才３斑
オ４図
了５鼠1 to 3 show an embodiment of the present invention,
FIG. 1 is a developed plan view of the main parts of the rotational position detection device, FIG. 2 is a sectional view taken along line A-A in FIG. 1, FIG. 3 is an exploded perspective view of the magnetic sensor, and FIGS. FIG. 5 is a schematic plan view showing an example of a conventional rotational position detection device, and B of FIG.
- It is a sectional view along the B line. 1... Recording medium (moving magnetic material), 2...
- Magnetoresistive element, 4...Substrate (base body), R1,
R2...Lead wire attachment part, R3...Detection part, R4, R5...Covering part, N, S...
・Record information. Na' Hongsai 2 Figures Sai 3 Spotted O 4 Figures Ryo 5 Mouse
Claims (1)
動磁性体と、この移動磁性体に対向して設けられた基体
とこの基体における前記移動磁性体の磁気情報記録面に
対向する表面に設けられた磁気抵抗素子からなる磁気セ
ンサとを備え、前記磁気抵抗素子は、前記移動磁性体に
記録された磁気情報と交叉して延びる検出部と、磁気抵
抗素子の両端部に設けられたリード線取付部からなる位
置検出装置において、前記磁気抵抗素子をその中間部で
折り返して少くとも２つの部分で前記磁気情報と交叉す
るようにするとともに、前記各リード線取付部を前記移
動磁性体の磁気情報記録面と前記基体の磁気抵抗素子設
置面との間の対向ギヤツプ外でかつ同一側に配置し、さ
らに前記磁気抵抗素子の磁気情報と交叉する一方の部分
を幅狭の検出部とし、他方の部分を幅広のわたり部とし
たことを特徴とする位置検出装置。1. A moving magnetic body on which a plurality of pieces of magnetic information are recorded along the moving direction, a base body provided facing the moving magnetic body, and a surface of the base body facing the magnetic information recording surface of the moving magnetic body. a magnetic sensor consisting of a magnetoresistive element provided, the magnetoresistive element having a detecting section extending to intersect with the magnetic information recorded on the moving magnetic body, and a lead provided at both ends of the magnetoresistive element. In a position detection device comprising a wire attachment portion, the magnetic resistance element is folded back at its intermediate portion so that it intersects the magnetic information in at least two portions, and each of the lead wire attachment portions is attached to the moving magnetic body. disposed outside the opposing gap and on the same side between the magnetic information recording surface and the magnetoresistive element installation surface of the base, and further having one portion that intersects with the magnetic information of the magnetoresistive element as a narrow detection section; A position detection device characterized in that the other part is a wide crossing part.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP54098070A JPS6022738B2 (en) | 1979-08-02 | 1979-08-02 | position detection device |
| US06/173,842 US4418372A (en) | 1979-08-02 | 1980-07-30 | Magnetic rotary encoder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP54098070A JPS6022738B2 (en) | 1979-08-02 | 1979-08-02 | position detection device |
Related Child Applications (3)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27239484A Division JPS60247113A (en) | 1984-12-24 | 1984-12-24 | Position detector |
| JP27239584A Division JPS60247114A (en) | 1984-12-24 | 1984-12-24 | Position detector |
| JP27239684A Division JPS60185115A (en) | 1984-12-24 | 1984-12-24 | Rotary sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5622961A JPS5622961A (en) | 1981-03-04 |
| JPS6022738B2 true JPS6022738B2 (en) | 1985-06-04 |
Family
ID=14210073
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP54098070A Expired JPS6022738B2 (en) | 1979-08-02 | 1979-08-02 | position detection device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6022738B2 (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58158017A (en) * | 1982-03-15 | 1983-09-20 | Hitachi Ltd | Magnetic head |
| JPS58163812U (en) * | 1982-04-28 | 1983-10-31 | ソニ−マグネスケ−ル株式会社 | magnetic head device |
| JPS5924210A (en) * | 1982-07-30 | 1984-02-07 | Sony Magnescale Inc | Magnetic head |
| JPS62247213A (en) * | 1986-10-20 | 1987-10-28 | Hitachi Ltd | Magnetic head |
| JPS62162215A (en) * | 1986-10-20 | 1987-07-18 | Hitachi Ltd | Magnetic head |
| JPS62162216A (en) * | 1986-10-20 | 1987-07-18 | Hitachi Ltd | Magnetic head |
| JPS62247212A (en) * | 1986-10-20 | 1987-10-28 | Hitachi Ltd | Magnetic heads |
| JPS62247214A (en) * | 1986-10-20 | 1987-10-28 | Hitachi Ltd | Magnetic head |
| JP7171380B2 (en) * | 2018-11-20 | 2022-11-15 | 日本電産サンキョー株式会社 | motor |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS572891Y2 (en) * | 1974-04-16 | 1982-01-19 |
-
1979
- 1979-08-02 JP JP54098070A patent/JPS6022738B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5622961A (en) | 1981-03-04 |
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