JPH05203402A - Rotational displacement detecting device - Google Patents
Rotational displacement detecting deviceInfo
- Publication number
- JPH05203402A JPH05203402A JP1016292A JP1016292A JPH05203402A JP H05203402 A JPH05203402 A JP H05203402A JP 1016292 A JP1016292 A JP 1016292A JP 1016292 A JP1016292 A JP 1016292A JP H05203402 A JPH05203402 A JP H05203402A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- permanent magnet
- rotational displacement
- detection element
- sensitive surface
- 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
Landscapes
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、永久磁石の回転変位
を、磁気検出素子の感磁面上の磁束方向の変化として検
出する回転変位検出装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotational displacement detecting device for detecting a rotational displacement of a permanent magnet as a change in a magnetic flux direction on a magnetically sensitive surface of a magnetic detection element.
【０００２】[0002]
【従来の技術】図３は例えば特開平２ー２９８８１５号
公報に示された従来の回転変位検出装置の一例を模式的
に示す平面図である。2. Description of the Related Art FIG. 3 is a plan view schematically showing an example of a conventional rotational displacement detecting device disclosed in Japanese Patent Application Laid-Open No. 2-298815.
【０００３】図において１は磁気検出素子であり、この
磁気検出素子１は、例えばガラス基板上に磁気抵抗パタ
ーンに構成された強磁性体磁気抵抗材料であるＮｉＦｅ
からなる磁気抵抗素子１ａが形成され、さらに絶縁樹脂
で直方体形状にモールドされて構成され、ガラス基板表
面の磁気抵抗素子１ａの形成面が感磁面１ｂとなってい
る。２は両端に一対の磁極２ａ、２ｂが設けられた角形
の永久磁石であり、この永久磁石２は、一対の磁極２
ａ、２ｂにより形成される磁界３が磁気検出素子１の感
磁面１ｂを平行に横切るように、Ｎ極とＳ極とを構成す
る磁極２ａ、２ｂを磁気検出素子１を挟んで対向するよ
うに配置し、かつ検出される回転変位と連動して磁気検
出素子１を中心として回転可能に配設されている。In the figure, reference numeral 1 denotes a magnetic detection element. This magnetic detection element 1 is, for example, NiFe which is a ferromagnetic magnetoresistive material formed in a magnetoresistive pattern on a glass substrate.
The magnetoresistive element 1a is formed by molding it into a rectangular parallelepiped shape with an insulating resin, and the surface of the glass substrate on which the magnetoresistive element 1a is formed is the magnetically sensitive surface 1b. Reference numeral 2 denotes a prismatic permanent magnet having a pair of magnetic poles 2a and 2b provided at both ends thereof.
The magnetic poles 2a and 2b forming the N pole and the S pole are opposed to each other with the magnetic detection element 1 interposed so that the magnetic field 3 formed by a and 2b crosses the magnetic sensitive surface 1b of the magnetic detection element 1 in parallel. And is arranged rotatably around the magnetic detection element 1 in conjunction with the detected rotational displacement.
【０００４】つぎに、上記従来の回転変位検出装置の動
作について説明する。永久磁石２は、検出される回転変
位と連動して磁気検出素子１の回りを回転する。この永
久磁石２の回転にともない、磁気検出素子１の感磁面２
ｂを平行に横切る磁界３の磁束方向が変化する。磁気検
出素子１の感磁面１ｂを横切る磁束方向が変化すること
により、この感磁面１ｂを横切る磁束方向の変化に応じ
て磁気抵抗素子１ａの磁気抵抗パターンの抵抗値が変化
し、永久磁石２の回転角度に対応した電圧が出力され
る。Next, the operation of the conventional rotational displacement detecting device will be described. The permanent magnet 2 rotates around the magnetic detection element 1 in conjunction with the detected rotational displacement. As the permanent magnet 2 rotates, the magnetically sensitive surface 2 of the magnetic detection element 1
The magnetic flux direction of the magnetic field 3 that crosses b in parallel changes. When the direction of the magnetic flux crossing the magnetic sensitive surface 1b of the magnetic detection element 1 changes, the resistance value of the magnetic resistance pattern of the magnetic resistance element 1a changes according to the change of the magnetic flux direction crossing the magnetic sensitive surface 1b, and the permanent magnet. The voltage corresponding to the rotation angle of 2 is output.
【０００５】この時、磁気検出素子１から出力される出
力電圧波形は、図４の波形Ａに示すような正弦波とな
り、約±２５ｄｅｇの回転角度範囲において磁石回転角
度と出力電圧値との間にリニアな関係が得られ、この出
力電圧値から永久磁石２の回転角度、つまり対象とする
回転変位を検出することができる。At this time, the output voltage waveform output from the magnetic detection element 1 becomes a sine wave as shown by the waveform A in FIG. 4, which is between the magnet rotation angle and the output voltage value in the rotation angle range of about ± 25 deg. A linear relationship is obtained, and the rotation angle of the permanent magnet 2, that is, the target rotational displacement can be detected from this output voltage value.
【０００６】[0006]
【発明が解決しようとする課題】従来の回転変位検出装
置は以上のように、角形の永久磁石２の両端に設けられ
た磁極２ａ、２ｂのそれぞれを磁気検出素子１を挟んで
対向するように配置し、磁気検出素子１を中心として回
転するように配設しているので、磁気検出素子１の配置
が永久磁石２の回転の障害とならないようにする必要が
あり、永久磁石２の回転機構が複雑となり、かつ磁石部
の構成部品が多くなり、組み立て性が低下するととも
に、広範囲な検出回転角度範囲が得られないという課題
があった。As described above, the conventional rotational displacement detecting device is configured so that the magnetic poles 2a and 2b provided at both ends of the rectangular permanent magnet 2 face each other with the magnetic detection element 1 interposed therebetween. Since the magnetic detection element 1 is arranged so as to rotate about the magnetic detection element 1, it is necessary to prevent the arrangement of the magnetic detection element 1 from interfering with the rotation of the permanent magnet 2. However, there is a problem that the magnet is complicated, the number of constituent parts of the magnet part is increased, the assemblability is deteriorated, and a wide detection rotation angle range cannot be obtained.
【０００７】この発明は、上記のような課題を解決する
ためになされたもので、装置構造を簡略化し、組み立て
性を向上するとともに、広範囲な検出回転角度範囲が得
られる回転変位検出装置を得ることを目的とする。The present invention has been made in order to solve the above problems, and provides a rotational displacement detecting device which simplifies the device structure, improves the assembling property, and obtains a wide range of detected rotational angle. The purpose is to
【０００８】[0008]
【課題を解決するための手段】この発明に係る回転変位
検出装置は、所定のパターンに形成された磁気抵抗素子
からなる感磁面を有する磁気検出素子と、磁束方向が感
磁面と平行となるように磁気検出素子と対向し、かつ検
出される回転変位と連動して回転可能に配設された円筒
形の永久磁石とを備えるものである。A rotational displacement detecting device according to the present invention has a magnetic detecting element having a magnetic sensitive surface formed of a magnetoresistive element formed in a predetermined pattern, and a magnetic flux direction parallel to the magnetic sensitive surface. The cylindrical permanent magnet is provided so as to face the magnetic detection element and rotatably arranged in association with the detected rotational displacement.
【０００９】[0009]
【作用】この発明においては、円筒形の永久磁石を、そ
の磁束方向が磁気検出素子の感磁面と平行となるように
磁気検出素子と対向し、かつ検出される回転変位と連動
して回転可能に配設しているので、永久磁石の回転軸は
磁気検出素子から所定の間隔をもって配置でき、永久磁
石の回転機構が簡易となり、磁石部の構成部品が簡素化
され、さらに永久磁石の検出回転角度範囲が広範囲とな
る。In the present invention, the cylindrical permanent magnet is opposed to the magnetic detecting element so that the magnetic flux direction thereof is parallel to the magnetic sensitive surface of the magnetic detecting element, and is rotated in association with the detected rotational displacement. Since it is possible to arrange, the rotation axis of the permanent magnet can be arranged at a predetermined distance from the magnetic detection element, the rotation mechanism of the permanent magnet can be simplified, the components of the magnet part can be simplified, and the detection of the permanent magnet can be performed. The rotation angle range becomes wide.
【００１０】[0010]
【実施例】以下、この発明の実施例を図について説明す
る。図１はこの発明の一実施例を示す回転変位検出装置
の断面図であり、図において図３に示した従来の回転変
位検出装置と同一または相当部分には同一符号を付し、
その説明を省略する。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of a rotational displacement detecting device showing an embodiment of the present invention, in which the same or corresponding parts as those of the conventional rotational displacement detecting device shown in FIG.
The description is omitted.
【００１１】図において、４は例えばポリブチレンテレ
フタレート樹脂でモールド成形された回転変位検出装置
の樹脂フレーム、５は樹脂フレーム４に回転自在に配設
された回転シャフト、６は回転シャフト５の一端に固着
されたアーム、７は回転シャフト５の他端に接着剤８で
接着固定された円筒形の永久磁石、９は図示していない
が配線パターンが形成されるとともに種々の電子部品が
搭載された回路基板としてのセラミック基板であり、こ
のセラミック基板９上には、感磁面１ｂが基板面に平行
となるように磁気検出素子１が搭載されている。１０は
磁気検出素子１が搭載されたセラミック基板９を包囲し
て配設された電磁波シールドケースとしての銅ケース、
１１は貫通コンデンサ１２を介して磁気検出素子１の出
力を取り出す入出力端子である。In the figure, 4 is a resin frame of a rotational displacement detection device molded with polybutylene terephthalate resin, 5 is a rotary shaft rotatably disposed on the resin frame 4, and 6 is one end of the rotary shaft 5. A fixed arm, 7 is a cylindrical permanent magnet adhered and fixed to the other end of the rotary shaft 5 with an adhesive 8, 9 is a wiring pattern (not shown) and various electronic parts are mounted. This is a ceramic substrate as a circuit substrate, and the magnetic detection element 1 is mounted on the ceramic substrate 9 so that the magnetic sensitive surface 1b is parallel to the substrate surface. Reference numeral 10 denotes a copper case as an electromagnetic wave shield case which is disposed so as to surround the ceramic substrate 9 on which the magnetic detection element 1 is mounted,
Reference numeral 11 is an input / output terminal for taking out the output of the magnetic detection element 1 via the feedthrough capacitor 12.
【００１２】ここで、このセラミック基板９は基板面が
永久磁石７と直交するように、つまり永久磁石７の磁界
が磁気検出素子１の感磁面１ｂを平行に横切るように樹
脂フレーム４に収納保持されている。Here, the ceramic substrate 9 is housed in the resin frame 4 so that the substrate surface is orthogonal to the permanent magnet 7, that is, the magnetic field of the permanent magnet 7 crosses the magnetic sensitive surface 1b of the magnetic detection element 1 in parallel. Is held.
【００１３】つぎに、上記実施例の回転変位検出装置の
動作について説明する。例えば車両の燃料流路である吸
気管内のスロットルバルブ（図示せず）の開閉状態に連
動してアーム６が回転する。このアーム６の回転は回転
シャフト５を介して永久磁石７に伝達され、アーム６の
回転に連動して永久磁石７が回転する。永久磁石７の回
転によって、磁気検出素子１の感磁面１ｂを平行に横切
る磁束方向が変化し、この感磁面１ｂを横切る磁束方向
の変化に応じて磁気抵抗素子１ａの磁気抵抗パターンの
抵抗値が変化し、永久磁石７の回転角度に対応した電圧
が出力される。磁気検出素子１からの出力電圧は増幅さ
れ、入出力端子１１を介して外部装置（図示せず）に出
力され、スロットルバルブの開閉状態が検出される。Next, the operation of the rotational displacement detecting device of the above embodiment will be described. For example, the arm 6 rotates in conjunction with the open / close state of a throttle valve (not shown) in the intake pipe that is the fuel flow path of the vehicle. The rotation of the arm 6 is transmitted to the permanent magnet 7 via the rotary shaft 5, and the permanent magnet 7 rotates in conjunction with the rotation of the arm 6. The rotation of the permanent magnet 7 changes the direction of the magnetic flux that crosses the magnetic sensitive surface 1b of the magnetic detection element 1 in parallel, and the resistance of the magnetic resistance pattern of the magnetic resistance element 1a changes according to the change of the magnetic flux direction that crosses the magnetic sensitive surface 1b. The value changes and a voltage corresponding to the rotation angle of the permanent magnet 7 is output. The output voltage from the magnetic detection element 1 is amplified and output to an external device (not shown) via the input / output terminal 11 to detect the open / closed state of the throttle valve.
【００１４】この時、磁気検出素子１が搭載されたセラ
ミック基板９を包囲して設けられた銅ケース１０によ
り、外部からの電磁波を遮蔽し、セラミック基板９に搭
載されている回路素子の誤動作を防止している。At this time, electromagnetic waves from the outside are shielded by the copper case 10 surrounding the ceramic substrate 9 on which the magnetic detection element 1 is mounted, and malfunction of the circuit element mounted on the ceramic substrate 9 is prevented. To prevent.
【００１５】つぎに、上記実施例において、種々の磁石
特性の円筒形の永久磁石７を用いて出力電圧波形を測定
し、その結果を図４に示す。ここでは、図２に示す磁気
検出素子１における永久磁石７の水平方向磁界成分ρ1
と垂直方向磁界成分ρ2との比（ρ2／ρ1）がそれぞ
れ、０．６＜ρ2／ρ1＜１、０．４≦ρ2／ρ1≦０．
６、ρ2／ρ1＜０．４の３種類の永久磁石７を用いてい
る。Next, in the above embodiment, the output voltage waveform was measured using the cylindrical permanent magnet 7 having various magnet characteristics, and the results are shown in FIG. Here, the horizontal magnetic field component ρ 1 of the permanent magnet 7 in the magnetic detection element 1 shown in FIG.
And the ratio (ρ 2 / ρ 1 ) of the vertical magnetic field component ρ 2 to 0.6 <ρ 2 / ρ 1 < 1, 0.4 ≦ ρ 2 / ρ 1 ≦ 0.
6, 3 types of permanent magnet 7 of ρ 2 / ρ 1 <0.4 are used.
【００１６】０．６＜ρ2／ρ1＜１の永久磁石７を用い
ると、図４の波形Ｂに示すように、約±４０ｄｅｇの永
久磁石７の回転角度範囲においてリニアな出力電圧が得
られている。また、０．４≦ρ2／ρ1≦０．６の永久磁
石７を用いると、図４の波形Ｃに示すように、約±５５
ｄｅｇの永久磁石７の回転角度範囲においてリニアな出
力電圧が得られている。さらに、ρ2／ρ1＜０．４の永
久磁石７を用いると、図４の波形Ｄに示すように、約±
５０ｄｅｇの永久磁石７の回転角度範囲においてリニア
な出力電圧が得られている。When the permanent magnet 7 with 0.6 <ρ 2 / ρ 1 <1 is used, a linear output voltage is obtained in the rotation angle range of the permanent magnet 7 of about ± 40 deg as shown by the waveform B in FIG. Has been. Further, when the permanent magnet 7 with 0.4 ≦ ρ 2 / ρ 1 ≦ 0.6 is used, as shown in the waveform C of FIG.
A linear output voltage is obtained in the rotation angle range of the permanent magnet 7 of deg. Further, when the permanent magnet 7 with ρ 2 / ρ 1 <0.4 is used, as shown in the waveform D of FIG.
A linear output voltage is obtained in the rotation angle range of the permanent magnet 7 of 50 deg.
【００１７】このように構成された上記実施例によれ
ば、円筒形の永久磁石７を用いることにより、磁気検出
素子１と対向する位置に永久磁石７を回転可能に配設で
き、永久磁石７の回転機構が簡単で、かつ構成部品が簡
素化され、さらに図３に示した従来の回転変位検出装置
に比べて、リニアな出力電圧が得られる永久磁石７の回
転角度範囲を広範囲とすることができる。さらに、磁気
検出素子１における永久磁石７の水平方向磁界成分ρ1
と垂直方向磁界成分ρ2との比（ρ2／ρ1）を０．４≦
ρ2／ρ1≦０．６と設定すると、リニアな出力電圧が得
られる永久磁石７の回転角度範囲は特に広範囲となる。According to the above-described embodiment, by using the cylindrical permanent magnet 7, the permanent magnet 7 can be rotatably arranged at the position facing the magnetic detection element 1, and the permanent magnet 7 can be arranged. The rotation mechanism is simple, the components are simplified, and the rotation angle range of the permanent magnet 7 capable of obtaining a linear output voltage is made wider than that of the conventional rotation displacement detection device shown in FIG. You can Further, the horizontal magnetic field component ρ 1 of the permanent magnet 7 in the magnetic detection element 1
And the ratio (ρ 2 / ρ 1 ) of the vertical magnetic field component ρ 2 to 0.4 ≦
When ρ 2 / ρ 1 ≦ 0.6 is set, the rotation angle range of the permanent magnet 7 where a linear output voltage is obtained becomes particularly wide.
【００１８】[0018]
【発明の効果】この発明によれば、円筒形の永久磁石
を、その磁束方向が磁気検出素子の感磁面と平行となる
ように磁気検出素子と対向させ、かつ検出される回転変
位と連動して回転可能に配設しているので、永久磁石の
回転機構の構造が簡単となり、組み立て性の向上が図れ
るとともに、広範囲の回転角度変位を検出できる回転変
位検出装置が得られるという効果がある。According to the present invention, the cylindrical permanent magnet is opposed to the magnetic detecting element so that the magnetic flux direction thereof is parallel to the magnetically sensitive surface of the magnetic detecting element, and is interlocked with the detected rotational displacement. Since it is rotatably arranged, the structure of the rotating mechanism of the permanent magnet is simplified, the assemblability can be improved, and the rotational displacement detection device capable of detecting a wide range of rotational angular displacement can be obtained. ..
【図１】この発明の一実施例を示す回転変位検出装置の
断面図である。FIG. 1 is a cross-sectional view of a rotational displacement detection device showing an embodiment of the present invention.
【図２】この発明の一実施例の回転変位検出装置を模式
的に示す平面図である。FIG. 2 is a plan view schematically showing a rotational displacement detection device according to an embodiment of the present invention.
【図３】従来の回転変位検出装置の一例を模式的に示す
平面図である。FIG. 3 is a plan view schematically showing an example of a conventional rotational displacement detection device.
【図４】この発明の回転変位検出装置における磁石回転
角度と出力電圧との関係を示すグラフである。FIG. 4 is a graph showing a relationship between a magnet rotation angle and an output voltage in the rotation displacement detection device of the present invention.
１ 磁気検出素子 １ａ 磁気抵抗素子 １ｂ 感磁面 ７ 永久磁石 1 Magnetic Detection Element 1a Magnetoresistive Element 1b Magnetic Sensing Surface 7 Permanent Magnet
Claims (1)
子からなる感磁面を有する磁気検出素子と、磁束方向が
前記感磁面と平行となるように前記磁気検出素子と対向
し、かつ検出される回転変位と連動して回転可能に配設
された円筒形の永久磁石とを備え、前記永久磁石の回転
変位を、前記感磁面を平行に横切る磁束方向の変化とし
て検出することを特徴とする回転変位検出装置。1. A magnetic detection element having a magnetically sensitive surface formed of a magnetoresistive element formed in a predetermined pattern, facing the magnetically sensitive element such that the magnetic flux direction is parallel to the magnetically sensitive surface, and detecting the magnetic field. And a cylindrical permanent magnet rotatably arranged in conjunction with the rotational displacement, the rotational displacement of the permanent magnet is detected as a change in a magnetic flux direction across the magnetically sensitive surface in parallel. And a rotational displacement detection device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1016292A JPH05203402A (en) | 1992-01-23 | 1992-01-23 | Rotational displacement detecting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1016292A JPH05203402A (en) | 1992-01-23 | 1992-01-23 | Rotational displacement detecting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05203402A true JPH05203402A (en) | 1993-08-10 |
Family
ID=11742589
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1016292A Pending JPH05203402A (en) | 1992-01-23 | 1992-01-23 | Rotational displacement detecting device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05203402A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001304805A (en) * | 2000-04-25 | 2001-10-31 | Tokai Rika Co Ltd | Detecting device for rotational angle |
| JP2006300789A (en) * | 2005-04-22 | 2006-11-02 | Tdk Corp | Tilt sensor |
| JP2008281556A (en) * | 2007-04-13 | 2008-11-20 | Hitachi Metals Ltd | Angle detector, valve system, and noncontact volume |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6031005A (en) * | 1983-07-29 | 1985-02-16 | Toshiba Corp | Detector of position of rotary angle |
| JPH03246401A (en) * | 1990-02-26 | 1991-11-01 | Matsushita Electric Ind Co Ltd | Rotational angle detector |
-
1992
- 1992-01-23 JP JP1016292A patent/JPH05203402A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6031005A (en) * | 1983-07-29 | 1985-02-16 | Toshiba Corp | Detector of position of rotary angle |
| JPH03246401A (en) * | 1990-02-26 | 1991-11-01 | Matsushita Electric Ind Co Ltd | Rotational angle detector |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001304805A (en) * | 2000-04-25 | 2001-10-31 | Tokai Rika Co Ltd | Detecting device for rotational angle |
| JP2006300789A (en) * | 2005-04-22 | 2006-11-02 | Tdk Corp | Tilt sensor |
| JP4618424B2 (en) * | 2005-04-22 | 2011-01-26 | Ｔｄｋ株式会社 | Tilt sensor |
| JP2008281556A (en) * | 2007-04-13 | 2008-11-20 | Hitachi Metals Ltd | Angle detector, valve system, and noncontact volume |
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