JPH0777164B2 - Non-contact type potentiometer - Google Patents
Non-contact type potentiometerInfo
- Publication number
- JPH0777164B2 JPH0777164B2 JP61198773A JP19877386A JPH0777164B2 JP H0777164 B2 JPH0777164 B2 JP H0777164B2 JP 61198773 A JP61198773 A JP 61198773A JP 19877386 A JP19877386 A JP 19877386A JP H0777164 B2 JPH0777164 B2 JP H0777164B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic field
- rotor
- generating means
- field generating
- ferromagnetic magnetoresistive
- 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 - Fee Related
Links
- 230000005291 magnetic effect Effects 0.000 claims description 46
- 230000005294 ferromagnetic effect Effects 0.000 claims description 23
- 239000000758 substrate Substances 0.000 claims description 7
- 230000005389 magnetism Effects 0.000 claims 1
- 230000007423 decrease Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000696 magnetic material Substances 0.000 description 3
- WPYVAWXEWQSOGY-UHFFFAOYSA-N indium antimonide Chemical compound [Sb]#[In] WPYVAWXEWQSOGY-UHFFFAOYSA-N 0.000 description 2
- 230000005415 magnetization Effects 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 229910017709 Ni Co Inorganic materials 0.000 description 1
- 229910003267 Ni-Co Inorganic materials 0.000 description 1
- 229910003271 Ni-Fe Inorganic materials 0.000 description 1
- 229910003262 Ni‐Co Inorganic materials 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
Landscapes
- Adjustable Resistors (AREA)
- Hall/Mr Elements (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ この発明は、ロータを回転させる非接触式ポテンショメ
ータに関し、特には磁界により抵抗値が減少する強磁性
磁気抵抗素子を用いた非接触式ポテンショメータに関す
る。Description: TECHNICAL FIELD The present invention relates to a non-contact potentiometer for rotating a rotor, and particularly to a non-contact potentiometer using a ferromagnetic magnetoresistive element whose resistance value is reduced by a magnetic field. .
［従来の技術］ 非接触式ポテンショメータの磁気回路は、従来より有底
円筒状コアや回転磁性体および永久磁石とともに、閉磁
路として構成され、回転磁性体の先端部分に形成した間
隙に磁気抵抗素子であるInSbを配置して回転磁性体の回
転に応じた出力を発生するようになっており、そしてし
かして回転磁性体の先端部分に形成した間隙の大きさを
変えることにより換言すれば回転磁性体の先端を所定の
関数加工することにより前述したようなInSb製の磁気抵
抗素子から所定の関数出力を得ている。[Prior Art] A magnetic circuit of a non-contact type potentiometer has conventionally been configured as a closed magnetic circuit together with a bottomed cylindrical core, a rotating magnetic body and a permanent magnet, and a magnetoresistive element is provided in a gap formed at the tip of the rotating magnetic body. InSb is arranged to generate an output according to the rotation of the rotating magnetic body.In other words, by changing the size of the gap formed at the tip of the rotating magnetic body, in other words, the rotating magnetic body is rotated. By processing the tip of the body with a predetermined function, a predetermined function output is obtained from the InSb magnetoresistive element as described above.
［発明が解決しようとする問題点］ この場合、特願昭61-72201号に開示した如く磁界発生手
段としての永久磁石は磁極が径方向に指向するように着
磁することが考えられるが、このように円弧形状の永久
磁石に着磁することは容易ではなく着磁させにくいとい
う問題がある。[Problems to be Solved by the Invention] In this case, as disclosed in Japanese Patent Application No. 61-72201, the permanent magnet as the magnetic field generating means may be magnetized so that the magnetic poles are oriented in the radial direction. As described above, it is not easy to magnetize the arc-shaped permanent magnet and it is difficult to magnetize.
この発明はこの問題点をなくすべく行なわれたもので、
磁界発生手段の着磁方向をロータの軸心方向に設定する
ことができ、磁石の形状がどのようであっても着磁を容
易に行うことができるといった優れた効果を有する非接
触式ポテンショメータを提供することを目的とする。This invention was made to eliminate this problem.
A non-contact potentiometer having an excellent effect that the magnetizing direction of the magnetic field generating means can be set in the axial direction of the rotor and magnetizing can be easily performed regardless of the shape of the magnet. The purpose is to provide.
［問題点を解決するための手段］ この発明は、ハウジング内に回転可能に設けられたロー
タと、このロータに同心的で該回転軸から所定の間隔を
余すようにして、かつそのロータの軸心と直交する平面
上に配設された一対の強磁性磁気抵抗素子を有する絶縁
基板と、前記ロータの回転中常に前記強磁性磁気抵抗素
子の一部に対向するように前記ロータに装着された磁界
発生手段とを備え、前記磁界発生手段の磁極を前記ロー
タの軸方向に指向させるとともに、前記磁界発生手段に
より前記磁界発生手段が対向していない前記強磁性磁気
抵抗素子の部分に前記絶縁基板の平面方向に偏向した磁
界を印加して閉磁路を形成するようにしたことを具備し
ていることを特徴とする構成を採用している。[Means for Solving the Problems] The present invention relates to a rotor rotatably provided in a housing, a rotor concentric with the rotor and leaving a predetermined distance from the rotation shaft, and the rotor shaft. An insulating substrate having a pair of ferromagnetic magnetoresistive elements arranged on a plane orthogonal to the center, and mounted on the rotor so as to face a part of the ferromagnetic magnetoresistive elements during rotation of the rotor. Magnetic field generating means, the magnetic poles of the magnetic field generating means are oriented in the axial direction of the rotor, and the insulating substrate is provided at the portion of the ferromagnetic magnetoresistive element where the magnetic field generating means does not face the magnetic field generating means. The configuration is adopted, in which a closed magnetic circuit is formed by applying a magnetic field deflected in the plane direction.
［作用］ 上記のように構成したこの発明によれば、磁界発生手段
が長方形あるいは円弧状を成す場合でも、これの着磁方
向がロータ軸心と平行な方向ですむようになり、磁界発
生手段の着磁が容易となる。[Operation] According to the present invention configured as described above, even when the magnetic field generating means has a rectangular shape or an arc shape, the magnetizing direction of the magnetic field generating means is only parallel to the rotor axis, and the magnetic field generating means is attached. Magnetization becomes easy.
［発明の効果］ 上記のように構成したこの発明によれば、磁界発生手段
がどのような形状を成す場合でも、これの着磁方向はロ
ータ軸心と平行な方向ですむようになり、磁界発生手段
の着磁が容易となるといった優れた効果を奏する非接触
式ポテンショメータを提供することができる。また磁界
発生手段の形状を任意のものにできるので特性を自由に
設定できる。[Effects of the Invention] According to the present invention configured as described above, no matter what shape the magnetic field generating means has, the magnetizing direction of the magnetic field generating means can be parallel to the rotor axis. It is possible to provide a non-contact type potentiometer which has an excellent effect that it is easy to magnetize. Further, since the shape of the magnetic field generating means can be made arbitrary, the characteristics can be freely set.
［実施例］ 以下この発明の実施例を図面に基づいて説明する。ま
ず、第１図（ａ）、（ｂ）は本発明の第１実施例を示
す。この第１図において、絶縁基板１上に開口部を持つ
円形または多角形の形状Ni-Fe、Ni-Coなどの薄膜から成
る強磁性磁気抵抗素子2a、2bを形成し、両端子部、およ
び中点部に電極３、４、５を形成する。かかる強磁性磁
気抵抗素子2a、2bの電極端子３に電源端子Vcc、電極端
子４を接地GNDとし中点部５から出力Voutを導出する。
そして、強磁性磁気抵抗素子2a、2bのプリントパターン
の中心に上蓋９のボールベアリングから成る軸受８が設
けられている。軸受８には非磁性体材料から形成され上
下方向に指向するロータとしての回転軸６が軸まわりに
回転可能に枢支されている。この回転軸６の片側には角
形の永久磁石７が磁界発生手段として取り付けられてい
る。この永久磁石７は回転軸６の軸方向に沿って着磁さ
れており、永久磁石７は回転軸６の回転により回転中強
磁性磁気抵抗素子2aまたは2bの一部に常に上下方向に対
向するように配置されている。なお10はハウジング、11
はワイヤーハーネスである。Embodiments Embodiments of the present invention will be described below with reference to the drawings. First, FIGS. 1A and 1B show a first embodiment of the present invention. In FIG. 1, ferromagnetic magnetoresistive elements 2a and 2b made of thin films of circular or polygonal shape Ni-Fe, Ni-Co or the like having an opening portion are formed on an insulating substrate 1, and both terminal portions, and The electrodes 3, 4, and 5 are formed at the midpoints. The output Vout is derived from the midpoint portion 5 with the power supply terminal Vcc as the electrode terminal 3 of the ferromagnetic magnetoresistive elements 2a and 2b and the electrode terminal 4 as the ground GND.
A bearing 8 made of a ball bearing for the upper lid 9 is provided at the center of the printed pattern of the ferromagnetic magnetoresistive elements 2a and 2b. A rotating shaft 6 as a rotor, which is made of a non-magnetic material and is oriented in the vertical direction, is pivotally supported on the bearing 8 so as to be rotatable about its axis. A square permanent magnet 7 is attached to one side of the rotary shaft 6 as a magnetic field generating means. The permanent magnet 7 is magnetized along the axial direction of the rotary shaft 6, and the permanent magnet 7 is always opposed vertically to a part of the ferromagnetic magnetoresistive element 2a or 2b during rotation by the rotation of the rotary shaft 6. Are arranged as follows. 10 is a housing, 11
Is a wire harness.
さて、強磁性磁気抵抗素子2a、2bにおいては下記の事実
が理論上、知られている。すなわち、強磁性磁気抵抗素
子は電流の流れる方向に対して直角方向から磁界を受け
ると、その部分の抵抗値が減少する特性を有しており、
また、飽和磁界以上の磁界を受けたときには、抵抗値の
減少は一定となり、半導体式磁気抵抗素子やホール素子
と相違して安定な出力が得られる特徴を有している。The following facts are theoretically known in the ferromagnetic magnetoresistive elements 2a and 2b. That is, a ferromagnetic magnetoresistive element has a characteristic that when a magnetic field is applied from a direction perpendicular to the direction of current flow, the resistance value of that portion decreases.
Further, when receiving a magnetic field equal to or higher than the saturation magnetic field, the decrease in the resistance value becomes constant, and unlike the semiconductor type magnetoresistive element and the Hall element, it has a characteristic that a stable output can be obtained.
つぎに、永久磁石７が強磁性磁気抵抗素子2aの全体に対
向しているときは、強磁性磁気抵抗素子2aには第１図
（ｂ）に矢印Ｈで示すように、抵抗面に垂直方向の磁界
が印加されており、強磁性磁気抵抗素子2aの抵抗値は変
化しない。このとき、永久磁石７とは反対側に位置する
強磁性磁気抵抗素子2bは永久磁石７からの磁界を第１図
（ｂ）に矢印ｉで示すように径方向に受け、その抵抗値
が減少する。回転軸６の回転に伴い強磁性磁気抵抗素子
2bの抵抗値は第２図に示すように連続的に変化し、ポテ
ンショメータの出力は略直線状態になる。この第２図の
場合、縦軸に出力（Vcc）を現わし、横軸に回転軸６の
回転角度（度）を示している。Next, when the permanent magnet 7 is opposed to the entire ferromagnetic magnetoresistive element 2a, the ferromagnetic magnetoresistive element 2a has a direction perpendicular to the resistance surface as indicated by an arrow H in FIG. 1 (b). Is applied, the resistance value of the ferromagnetic magnetoresistive element 2a does not change. At this time, the ferromagnetic magnetoresistive element 2b located on the side opposite to the permanent magnet 7 receives the magnetic field from the permanent magnet 7 in the radial direction as indicated by the arrow i in FIG. 1 (b), and its resistance value decreases. To do. Ferromagnetic magnetoresistive element along with rotation of rotating shaft 6
The resistance value of 2b changes continuously as shown in FIG. 2, and the output of the potentiometer becomes substantially linear. In the case of FIG. 2, the vertical axis represents the output (Vcc) and the horizontal axis represents the rotation angle (degree) of the rotary shaft 6.
永久磁石７の着磁方向は絶縁基板１の平面方向ではな
く、この平面方向とは直交する方向で済むので、着磁が
容易になり、ひいては磁界発生手段の製作が容易になり
コスト的にも有利となる。Since the magnetizing direction of the permanent magnet 7 is not the plane direction of the insulating substrate 1 but the direction orthogonal to this plane direction, the magnetization is facilitated, which in turn facilitates the production of the magnetic field generating means, and also in terms of cost. Be advantageous.
また、半導体磁気抵抗素子やホール素子を用いたときに
は、磁界強度がばらつくと特性に大きく影響してくる
が、この実施例のように強磁性磁気抵抗素子を用いたと
きには、飽和磁界以上の磁界をあらかじめ印加しておけ
ば、実施例上ではポテンショメータの安定した出力が得
られる。Further, when a semiconductor magnetoresistive element or a Hall element is used, variations in magnetic field strength greatly affect the characteristics, but when a ferromagnetic magnetoresistive element is used as in this embodiment, a magnetic field above the saturation magnetic field is applied. If applied beforehand, a stable output of the potentiometer can be obtained in the embodiment.
つぎに、この発明の第２実施例を第３図および第４図を
参照して説明する。この第２実施例が第１実施例と相違
するところは第２実施例では、磁気材料により形成され
たヨーク12を設けたところである。すなわち、回転軸の
下端には、磁性材料により断面横Ｌ字状に形成されたヨ
ーク12が取り付けられ、このヨーク12の下面には永久磁
石７が接着剤などにより取り付けられている。そして、
永久磁石７が強磁性磁気抵抗素子2aに対面し、ヨーク12
の下垂部12aが強磁磁気抵抗素子2bに対応している。こ
のように構成すれば、ヨーク12の集磁作用により第３図
に記号ｉで示すように永久磁石７、強磁磁気抵抗素子2b
およびヨーク12の間に閉路が生じる。これにより強磁性
磁気抵抗素子2bを通過する磁束数が増加するため第４図
に示すような特性が得られる。この第４図において、縦
軸に出力（Vout）、横軸に回転角度（度）を取ってい
る。これによれば、第２実施例に比較して立上がりが大
となり大きな出力が得られることが理解できる。Next, a second embodiment of the present invention will be described with reference to FIGS. 3 and 4. The difference of the second embodiment from the first embodiment is that the yoke 12 made of a magnetic material is provided in the second embodiment. That is, a yoke 12 formed of a magnetic material and having an L-shaped cross section is attached to the lower end of the rotary shaft, and a permanent magnet 7 is attached to the lower surface of the yoke 12 by an adhesive agent or the like. And
The permanent magnet 7 faces the ferromagnetic magnetoresistive element 2a, and the yoke 12
The hanging portion 12a corresponds to the strong magnetic magnetoresistive element 2b. According to this structure, the permanent magnet 7 and the strong magnetic magnetoresistive element 2b as shown by the symbol i in FIG.
And a closed circuit occurs between the yoke 12 and the yoke 12. As a result, the number of magnetic fluxes passing through the ferromagnetic magnetoresistive element 2b increases, so that the characteristic shown in FIG. 4 is obtained. In FIG. 4, the vertical axis represents output (Vout) and the horizontal axis represents rotation angle (degrees). According to this, it can be understood that the rise is large and a large output can be obtained as compared with the second embodiment.
第５図はこの発明の第３実施例を示す。FIG. 5 shows a third embodiment of the present invention.
この実施例では、ヨーク12の下垂部12aの形状をくの字
状に形成している。このように構成してもよい。In this embodiment, the hanging portion 12a of the yoke 12 is formed in a dogleg shape. You may comprise in this way.
第６図はこの発明の第４実施例を示す。FIG. 6 shows a fourth embodiment of the present invention.
この実施例では、ヨーク12の下垂部12aの部分を面取り
状に形成している。このように構成してもよい。In this embodiment, the hanging portion 12a of the yoke 12 is chamfered. You may comprise in this way.
第７図はこの発明の第５実施例を示す。この実施例で
は、ヨーク12を永久磁石７に当接させるようにして回転
軸６に取り付けている。この第５実施例においても、ヨ
ーク12の下垂部12aを第５および第６実施例で述べたよ
うにくの字状あるいは面取り状に形成してもよい。FIG. 7 shows a fifth embodiment of the present invention. In this embodiment, the yoke 12 is attached to the rotary shaft 6 so as to come into contact with the permanent magnet 7. Also in the fifth embodiment, the hanging portion 12a of the yoke 12 may be formed in a dogleg shape or a chamfered shape as described in the fifth and sixth embodiments.
なお、上記実施例では強磁性磁気抵抗素子2a、2bの形状
は円形または多角形であったが、形状はこれのみに限定
されず、例えば短冊状であってもよい。Although the ferromagnetic magnetoresistive elements 2a and 2b have a circular or polygonal shape in the above embodiment, the shape is not limited to this and may be, for example, a strip shape.
第１図はこの発明のポテンショメータの一実施例であ
り、同図（ａ）にその平面図、同図（ｂ）にＡ−Ａ線の
断面図を示す。第２図は回転角度と出力との関係を示す
出力特性グラフ、第３図は第２図実施例の平面図、第４
図は第２実施例の断面図、第５図（ａ）、（ｂ）はこの
発明の第３実施例を示す平面図ならびに断面図、第６図
（ａ）、（ｂ）はこの発明の第４実施例を示す平面図な
らびに断面図、第７図（ａ）、（ｂ）はこの発明の第５
実施例を示す平面図ならびに断面図である。 図中、１……絶縁基板（回路基板）、2a、2b……強磁性
磁気抵抗素子、６……回転軸（ロータ）、７……永久磁
石（磁界発生手段）、10……ハウジングFIG. 1 shows an embodiment of the potentiometer according to the present invention. FIG. 1 (a) is a plan view thereof and FIG. 1 (b) is a sectional view taken along line AA. 2 is an output characteristic graph showing the relationship between the rotation angle and the output, FIG. 3 is a plan view of the embodiment of FIG. 2, and FIG.
FIG. 5 is a sectional view of the second embodiment, FIGS. 5 (a) and 5 (b) are plan views and sectional views showing the third embodiment of the present invention, and FIGS. 6 (a) and 6 (b) are of the present invention. A plan view and a sectional view showing a fourth embodiment, and FIGS. 7 (a) and 7 (b) show a fifth embodiment of the present invention.
It is a top view and a sectional view showing an example. In the figure, 1 ... Insulating substrate (circuit board), 2a, 2b ... Ferromagnetic magnetoresistive element, 6 ... Rotating shaft (rotor), 7 ... Permanent magnet (magnetic field generating means), 10 ... Housing
───────────────────────────────────────────────────── フロントページの続き (72)発明者 有賀 勝彦 愛知県刈谷市昭和町１丁目１番地 日本電 装株式会社内 (72)発明者 松下 利和 愛知県刈谷市昭和町１丁目１番地 日本電 装株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Katsuhiko Ariga 1-1, Showa-cho, Kariya, Aichi Nihon Denso Co., Ltd. (72) Inventor Toshikazu Matsushita 1-1, Showa-cho, Kariya, Aichi Nihon Denso Within the corporation
Claims (3)
ようにして、かつそのロータ軸心と直交する平面上に配
設された一対の強磁性磁気抵抗素子を有する絶縁基板
と、 前記ロータの回転中常に前記強磁性磁気抵抗素子の一部
に対向するように前記ロータに装着された磁界発生手段
とを備え、 前記磁界発生手段の磁極を前記ロータの軸方向に指向さ
せるとともに、前記磁界発生手段により前記磁界発生手
段が対向していない前記強磁性磁気抵抗素子の部分に前
記絶縁基板の平面方向に偏向した磁界を印加して閉磁路
を形成するようにしたことを特徴とする非接触式ポテン
ショメータ。1. A housing, a rotor rotatably provided in the housing, and a plane concentric with the rotor at a predetermined distance from the rotor and on a plane orthogonal to the rotor axis. An insulating substrate having a pair of ferromagnetic magnetoresistive elements arranged, and a magnetic field generating means attached to the rotor so as to always face a part of the ferromagnetic magnetoresistive elements during rotation of the rotor, A magnetic field generated by directing the magnetic poles of the magnetic field generating means in the axial direction of the rotor and deflecting the magnetic field generating means in the plane direction of the insulating substrate at the portion of the ferromagnetic magnetoresistive element not facing the magnetic field generating means. A non-contact potentiometer characterized in that a closed magnetic circuit is formed by applying a voltage.
る集磁を行うヨークが設けられていることを特徴とする
特許請求の範囲第１項に記載の非接触式ポテンショメー
タ。2. The non-contact potentiometer according to claim 1, wherein the rotor is provided with a yoke for collecting magnetism with respect to the magnetic field generating means.
いることを特徴とする特許請求の範囲第１項または第２
項に記載の非接触式ポテンショメータ。3. The magnetic field generating means comprises a permanent magnet, according to claim 1 or 2.
The non-contact potentiometer according to the item.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61198773A JPH0777164B2 (en) | 1986-08-25 | 1986-08-25 | Non-contact type potentiometer |
| EP87110695A EP0255052B1 (en) | 1986-07-29 | 1987-07-23 | Noncontact potentiometer |
| US07/076,891 US4835509A (en) | 1986-07-29 | 1987-07-23 | Noncontact potentiometer |
| DE3788831T DE3788831T2 (en) | 1986-07-29 | 1987-07-23 | Contactless potentiometer. |
| KR1019870008259A KR900007100B1 (en) | 1986-07-29 | 1987-07-29 | Non-contact potentiometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61198773A JPH0777164B2 (en) | 1986-08-25 | 1986-08-25 | Non-contact type potentiometer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6354780A JPS6354780A (en) | 1988-03-09 |
| JPH0777164B2 true JPH0777164B2 (en) | 1995-08-16 |
Family
ID=16396687
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61198773A Expired - Fee Related JPH0777164B2 (en) | 1986-07-29 | 1986-08-25 | Non-contact type potentiometer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0777164B2 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5227656Y2 (en) * | 1973-08-06 | 1977-06-23 |
-
1986
- 1986-08-25 JP JP61198773A patent/JPH0777164B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6354780A (en) | 1988-03-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |