JPH084041B2 - Potentiometer - Google Patents
PotentiometerInfo
- Publication number
- JPH084041B2 JPH084041B2 JP62016559A JP1655987A JPH084041B2 JP H084041 B2 JPH084041 B2 JP H084041B2 JP 62016559 A JP62016559 A JP 62016559A JP 1655987 A JP1655987 A JP 1655987A JP H084041 B2 JPH084041 B2 JP H084041B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetoresistive element
- annular plate
- magnetic field
- potentiometer
- 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 - Lifetime
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- Adjustable Resistors (AREA)
- Hall/Mr Elements (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明はポテンショメータに関し、特に方向の異なる
曲折状素子帯を有する差動型強磁性磁気抵抗素子を有す
る非直線無接触ポテンショメータにかかる。Description: FIELD OF THE INVENTION The present invention relates to a potentiometer, and more particularly to a non-linear contactless potentiometer having a differential ferromagnetic magnetoresistive element having bent element bands with different directions.
［従来の技術］ 従来より非接触ポテンショメータの磁気回路は、有底
円筒状コアや回転磁性体および永久磁石と共に閉磁路と
して構成され、回転磁性体の先端部分に形成した間隙に
半導体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
て回転磁性体の先端部分の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形状に
なるように加工することにより、InSbから所定の関数出
力を得ている。[Prior Art] Conventionally, a magnetic circuit of a non-contact potentiometer is configured as a closed magnetic circuit together with a bottomed cylindrical core, a rotating magnetic body and a permanent magnet, and a semiconductor magnetoresistive element is provided in a gap formed at the tip of the rotating magnetic body. An InSb is arranged to generate an output according to the rotation of the rotating magnetic body, and by changing the size of the gap at the tip of the rotating magnetic body, in other words, the tip of the rotating magnetic body. Is processed into a predetermined function shape to obtain a predetermined function output from InSb.
［発明が解決しようとする問題点］ この非接触ポテンショメータを例えば自動車のスロッ
トル開度センサに用いた場合、スロットルバルブ（絞り
弁）の開度を検出するためには、サイン曲線近似出力、
またはタンジェント曲線近似出力が必要となる。このよ
うな関数形状になるように回転磁性体の先端を加工する
ことは非常に困難である。半導体磁気抵抗素子の代りに
強磁性磁気抵抗素子を使用すれば、容易にサイン曲線近
似出力が得られるが、永久磁石の回転角度は90゜以内に
限られているので、所望の非直線関数を得ることは困難
であった。[Problems to be Solved by the Invention] When this non-contact potentiometer is used for a throttle opening sensor of an automobile, for example, in order to detect the opening of a throttle valve (throttle valve), a sine curve approximation output,
Or tangent curve approximation output is required. It is very difficult to process the tip of the rotating magnetic body so as to have such a functional shape. If a ferromagnetic magnetoresistive element is used instead of a semiconductor magnetoresistive element, a sine curve approximation output can be easily obtained, but since the rotation angle of the permanent magnet is limited to within 90 °, the desired nonlinear function can be obtained. It was difficult to get.
さらに摺動型ポテンショメータでは、機械運動する回
転軸やプランジャに直接結合して連動させているため、
ポテンショメータの寿命やヒステリシス特性が障害とな
るので、応答速度の低下、摺動ノイズの発生という問題
点を有し満足なものは得られなかった。In addition, the sliding potentiometer is directly coupled to the rotating shaft and the plunger that move mechanically, so that
Since the life of the potentiometer and the hysteresis characteristics are obstacles, there are problems that the response speed is lowered and sliding noise is generated, so that a satisfactory product cannot be obtained.
本発明は、磁界の回転角度を円環板状磁石の回転角度
の所定の角度に認定することにより、所定の非直線関数
出力を容易に得ることが可能なポテンショメータの提供
を目的とする。An object of the present invention is to provide a potentiometer capable of easily obtaining a predetermined non-linear function output by recognizing a rotation angle of a magnetic field as a predetermined rotation angle of an annular plate magnet.
［問題点を解決するための手段］ 本発明のポテンショメータは、絶縁基盤上に方向の異
なる曲折（ミアンダ:meander）状素子帯を付着させてな
る差動型強磁性磁気抵抗素子と、該強磁性磁気抵抗素子
と所定の間隔を隔てて平行的に配置された放射状着磁の
円環板状磁石と、前記強磁性磁気抵抗素子の中心と円環
板状磁石の中心との中間に設定した回転軸まわりに、前
記円環板状磁石を回転させ、前記強磁性磁気抵抗素子に
作用する前記円環板状磁石の磁界を偏向する回転手段と
を備え、前記磁界の回転角度を前記円環板状磁石の回転
角度の所定の角度に設定して、所定の非直線関数出力を
発生させるという構成を採用した。[Means for Solving Problems] A potentiometer according to the present invention is a differential ferromagnetic magnetoresistive element in which meander element bands of different directions are attached on an insulating substrate, and the ferromagnetic element. Radially magnetized toroidal plate magnets arranged in parallel with the magnetoresistive element at a predetermined interval, and rotation set midway between the center of the ferromagnetic magnetoresistive element and the center of the toroidal plate magnet. Rotation means for rotating the annular plate magnet around an axis to deflect the magnetic field of the annular plate magnet acting on the ferromagnetic magnetoresistive element, and the rotation angle of the magnetic field is the annular plate. A configuration is adopted in which a predetermined non-linear function output is generated by setting a predetermined rotation angle of the magnet.
［作用］ 本発明のポテンショメータは上記構成によりつぎの作
用を有する。[Operation] The potentiometer of the present invention has the following operation due to the above configuration.
差動型強磁性磁気抵抗素子の中心と放射状着磁の円環
板状磁石の中心との中間に設定した回転軸まわりに円環
板状磁石を回転させて、円環板状磁石から方向の異なる
曲折状素子帯へ作用する磁界を偏向することにより、磁
界の回転角度を円環板状磁石の回転角度の所定の角度に
設定して、所定の非直線関数出力を発生させる。Rotate the ring-shaped plate magnet around the rotation axis set midway between the center of the differential ferromagnetic magnetoresistive element and the center of the radially magnetized ring-shaped plate magnet, By deflecting the magnetic field acting on the different bent element bands, the rotation angle of the magnetic field is set to a predetermined angle of the rotation angle of the annular plate magnet, and a predetermined non-linear function output is generated.
［発明の効果］ 本発明のポテンショメータは上記構成および作用によ
りつぎの効果を奏する。[Effects of the Invention] The potentiometer of the present invention has the following effects due to the above configuration and operation.
無接触で所定の非直線関数出力を発生させることがで
き、摩耗しないので半永久的な寿命をもつと共に、摺動
ノイズが発生しない。It is possible to generate a predetermined non-linear function output without contact, and since it does not wear, it has a semi-permanent life and sliding noise does not occur.
［実施例］ 本発明のポテンショメータを図に示す実施例に基づき
説明する。[Example] The potentiometer of the present invention will be described based on an example shown in the drawings.
第１図および第２図は本発明のポテンショメータの第
１実施例を用いた非直線無接触ポテンショメータを示
す。1 and 2 show a non-linear contactless potentiometer using a first embodiment of the potentiometer of the present invention.
本実施例の非直線無接触ポテンショメータ（以下ポテ
ンショメータと略す）１は、スロットル開度センサ、ハ
イトセンサ、または車高センサに用いる。ポテンショメ
ータ１は、円形の容器状ハウジング11に設けられてお
り、このハウジング11には、上蓋12が配されている。ま
たハウジング11の底壁13に固定された円板状の取付基盤
14上には、円板状の絶縁基盤２が固定されている。The non-linear non-contact potentiometer (hereinafter abbreviated as potentiometer) 1 of this embodiment is used as a throttle opening sensor, a height sensor, or a vehicle height sensor. The potentiometer 1 is provided in a circular container-shaped housing 11, and an upper lid 12 is arranged in the housing 11. A disk-shaped mounting base fixed to the bottom wall 13 of the housing 11
A disc-shaped insulating base 2 is fixed on the top 14.
この絶縁基盤２上には、Ni−Fe、Ni−Co等の薄膜から
なる差動型強磁性磁気抵抗素子３が付着されている。強
磁性磁気抵抗素子３は、第３図に示すごとく、絶縁基盤
２の中央部21に強磁性磁気抵抗素子３の出力（Vout）を
取り出す出力取出端子31が形成されている。この出力取
出端子31は、方向の120゜異なる曲折状素子帯32、34を
介して電源電圧（Vcc）の入力端子33および接地（Gnd）
端子35と接続されている。入力端子33は、ワイヤーハー
ネス36を介して電源（図示せず）に接続している。On the insulating substrate 2, a differential type ferromagnetic magnetoresistive element 3 made of a thin film of Ni-Fe, Ni-Co, etc. is attached. As shown in FIG. 3, the ferromagnetic magnetoresistive element 3 is provided with an output lead terminal 31 for taking out the output (Vout) of the ferromagnetic magnetoresistive element 3 at the central portion 21 of the insulating substrate 2. The output output terminal 31 is connected to the input terminal 33 for the power supply voltage (Vcc) and the ground (Gnd) via the bent element bands 32 and 34 which are different in direction by 120 °.
It is connected to terminal 35. The input terminal 33 is connected to a power source (not shown) via a wire harness 36.
この強磁性磁気抵抗素子３と所定の間隔を隔てて平行
に放射状着磁の円環板状磁石４が配されている。円環板
状磁石４は、回転軸５まわりに円環板状磁石４を回転さ
せる回転手段であるロータ６の（第２図において）図示
下面61に取付けられている。Radially magnetized annular plate-shaped magnets 4 are arranged in parallel with the ferromagnetic magnetoresistive element 3 at a predetermined interval. The annular plate-shaped magnet 4 is attached to the lower surface 61 (in FIG. 2) of the rotor 6 which is a rotating means for rotating the annular plate-shaped magnet 4 around the rotating shaft 5.
円環板状磁石４は、永久磁石であり、強磁性磁気抵抗
素子３の中心37と中心41との中間に設定された回転軸５
を回転中心42として、ロータ６と共に強磁性磁気抵抗素
子３に対して相対的に回転する。また円環板状磁石４
は、内周43がわにＳ極、外周44がわにＮ極が配されてい
る。円環板状磁石４の回転中心42は、円環板状磁石４の
中心41から半径方向に半径の2/5ずれた位置となってい
る。The annular plate-shaped magnet 4 is a permanent magnet, and has a rotating shaft 5 that is set midway between the center 37 and the center 41 of the ferromagnetic magnetoresistive element 3.
About the rotation center 42, and the rotor 6 rotates relatively to the ferromagnetic magnetoresistive element 3. In addition, the annular plate magnet 4
Has an S pole on the inner circumference 43 and an N pole on the outer circumference 44. The rotation center 42 of the annular plate magnet 4 is located at a position deviated from the center 41 of the annular plate magnet 4 in the radial direction by 2/5 of the radius.
回転軸５の先端51は、ロータ６に一体的に連結され、
円環板状磁石４の回転中心42に対応したロータ６の回転
中心62に固着されている。また回転軸５は、ハウジング
11の上蓋12の中央穴15に取付けられた軸受16に回転自在
に支持されている。ハウジング11の側壁17の内周18とロ
ータ６の外周64との間には、所定の間隙が形成されてい
る。The tip 51 of the rotating shaft 5 is integrally connected to the rotor 6,
It is fixed to the rotation center 62 of the rotor 6 corresponding to the rotation center 42 of the annular plate-shaped magnet 4. The rotating shaft 5 is a housing
It is rotatably supported by a bearing 16 attached to a central hole 15 of the upper lid 12 of the eleventh. A predetermined gap is formed between the inner circumference 18 of the side wall 17 of the housing 11 and the outer circumference 64 of the rotor 6.
つまり回転軸５が回転することにより、円環板状磁石
４およびロータ６は、強磁性磁気抵抗素子３の図示上方
を偏向しながら回転する。また強磁性磁気抵抗素子３に
作用する円環板状磁石４の磁界７は、回転軸５を中心と
して回転する。よって磁界７もまた強磁性磁気抵抗素子
３の図示上方を偏向しながら回転する。この磁界７の強
度の絶対値は、強磁性磁気抵抗素子３の飽和磁界強度以
上となっている。That is, when the rotary shaft 5 rotates, the annular plate-shaped magnet 4 and the rotor 6 rotate while deflecting the ferromagnetic magnetoresistive element 3 above the drawing. The magnetic field 7 of the annular plate-shaped magnet 4 acting on the ferromagnetic magnetoresistive element 3 rotates about the rotation axis 5. Therefore, the magnetic field 7 also rotates while deflecting above the ferromagnetic magnetoresistive element 3 in the figure. The absolute value of the strength of the magnetic field 7 is equal to or higher than the saturation magnetic field strength of the ferromagnetic magnetoresistive element 3.
まず、強磁性磁気抵抗素子の一般的事項について説明
する。First, general items of the ferromagnetic magnetoresistive element will be described.
強磁性磁気抵抗素子３に飽和磁界強度以上の磁界７を
印加して、磁界７を強磁性磁気抵抗素子３の平面で回転
させる。強磁性磁気抵抗素子３は、電流方向が磁界７に
平行な場合と垂直な場合とでは抵抗値にわずかな相違が
ある。このため、出力取出端子31と入力端子33との間の
曲折状素子帯32の抵抗値と、および出力取出端子31と接
地端子35との間の曲折状素子帯34の抵抗値との比により
決まる電源電圧（Vcc）の分圧値としての出力（Vout）
は、第４図に示すごとく、磁界７の回転角度90゜でピー
ク値を持つサイン曲線近似出力となる。A magnetic field 7 having a saturation magnetic field strength or higher is applied to the ferromagnetic magnetoresistive element 3 to rotate the magnetic field 7 on the plane of the ferromagnetic magnetoresistive element 3. The ferromagnetic magnetoresistive element 3 has a slight difference in resistance value between the case where the current direction is parallel to the magnetic field 7 and the case where the current direction is perpendicular to the magnetic field 7. Therefore, depending on the ratio of the resistance value of the bent element band 32 between the output extraction terminal 31 and the input terminal 33 and the resistance value of the bent element band 34 between the output extraction terminal 31 and the ground terminal 35. Output (Vout) as the divided voltage value of the determined power supply voltage (Vcc)
Becomes a sine curve approximation output having a peak value at a rotation angle of 90 ° of the magnetic field 7, as shown in FIG.
この出力（Vout）は、飽和磁界強度以上の磁界７であ
れば一定の出力となり、半導体磁気抵抗素子やホール素
子と比較して安定した出力となっている。よって、強磁
性磁気抵抗素子３の出力（Vout）は、円環板状磁石４の
取付け誤差および着磁強度の多少の変動に対して何ら依
存することがなくなる。This output (Vout) is a constant output if the magnetic field 7 is equal to or higher than the saturation magnetic field strength, and is a stable output as compared with a semiconductor magnetoresistive element or a Hall element. Therefore, the output (Vout) of the ferromagnetic magnetoresistive element 3 does not depend on the mounting error of the annular plate magnet 4 and the slight fluctuation of the magnetizing strength.
ここで第４図において、磁界７の回転角度０゜とは、
円環板状磁石４の点Ａが強磁性磁気抵抗素子３の中心37
の位置にあるときである。また磁界７の回転方向は、ど
ちらでも良い。Here, in FIG. 4, the rotation angle 0 ° of the magnetic field 7 is
Point A of the annular plate magnet 4 is the center 37 of the ferromagnetic magnetoresistive element 3.
When it is in the position. The magnetic field 7 may be rotated in either direction.
つぎに本実施例のポテンショメータ１の作用を図に基
づき説明する。Next, the operation of the potentiometer 1 of this embodiment will be described with reference to the drawings.
本実施例のポテンショメータ１は、回転軸５を放射状
着磁の円環板状磁石４の中心41と強磁性磁気抵抗素子３
の中心37との間（本実施例では円環板状磁石４の中心41
から半径方向に半径の2/5ずれた位置）に取付けてい
る。このため、円環板状磁石４の回転に対し、強磁性磁
気抵抗素子３に印加される磁界７の回転角度は、第５図
に示すごとく、円環板状磁石４の回転角度の1/2の角度
に設定される。したがって、強磁性磁気抵抗素子３の出
力（Vout）は、第６図に示すごとく、円環板状磁石４の
回転に対し、円環板状磁石４の回転角度０゜および180
゜でピーク値を持つサイン曲線近似出力の非直線関数出
力となる。In the potentiometer 1 of this embodiment, the rotary shaft 5 has a center 41 of a ring-shaped plate magnet 4 radially magnetized and a ferromagnetic magnetoresistive element 3.
Between the center 37 and the center 37 (in this embodiment, the center 41 of the annular plate-shaped magnet 4).
It is installed at a position that is 2/5 of the radius away from). Therefore, as shown in FIG. 5, the rotation angle of the magnetic field 7 applied to the ferromagnetic magnetoresistive element 3 with respect to the rotation of the ring-shaped plate magnet 4 is 1 / the rotation angle of the ring-shaped plate magnet 4. Set to an angle of 2. Therefore, as shown in FIG. 6, the output (Vout) of the ferromagnetic magnetoresistive element 3 is 0 ° and 180 ° with respect to the rotation of the annular plate magnet 4 with respect to the rotation of the annular plate magnet 4.
It becomes a non-linear function output of a sine curve approximation output having a peak value at °.
すなわち、本実施例のポテンショメータ１は、機械装
置において、機能の一部を電気手段に置換えることが可
能となり、スロットル開度センサ、ハイトセンサ、また
は車高センサに適用することが可能となる。また無接触
でサイン曲線近似出力を発生させることが可能なため、
半永久的な寿命をもち、摺動ノイズの発生もない。That is, the potentiometer 1 of the present embodiment can replace a part of the function of the mechanical device with an electric means, and can be applied to a throttle opening sensor, a height sensor, or a vehicle height sensor. Also, since it is possible to generate a sine curve approximation output without contact,
Has a semi-permanent life and does not generate sliding noise.
第７図は本発明のポテンショメータの第２実施例を示
す。FIG. 7 shows a second embodiment of the potentiometer of the present invention.
本実施例の磁性磁気抵抗素子８は、絶縁基盤２の中央
部21に出力取出端子81が付着されている。この出力取出
端子81は、方向の90゜異なる曲折状素子帯82、84を介し
て入力端子83および接地端子85と接続されている。In the magnetic magnetoresistive element 8 of this embodiment, an output lead terminal 81 is attached to the central portion 21 of the insulating substrate 2. The output take-out terminal 81 is connected to an input terminal 83 and a ground terminal 85 via bent element bands 82 and 84 which are different in direction by 90 °.
本実施例では、方向の異なった２つの曲折状素子帯の
角度を90゜または120゜に設定したが、２つの曲折状素
子帯の角度を所定の非直線関数出力を発生させることが
可能な範囲内で種々設定しても良い。In this embodiment, the angle of the two bent element bands having different directions is set to 90 ° or 120 °, but the angle of the two bent element bands can generate a predetermined non-linear function output. Various settings may be made within the range.
第１図は本発明の第１実施例を用いた非直線無接触ポテ
ンショメータを示す側面断面図、第２図は本発明の第１
実施例を用いた非直線無接触ポテンショメータを示す正
面図、第３図は本発明の第１実施例にかかる強磁性磁気
抵抗素子を示す正面図、第４図は本発明の第１実施例に
かかる磁界の回転角度と強磁性磁気抵抗素子の出力の値
との関係を示すグラフ、第５図は本発明の第１実施例に
かかる円環板状磁石の回転角度と強磁性磁気抵抗素子に
印加される磁界の回転角度との関係を示すグラフ、第６
図は本発明の第１実施例にかかる円環板状磁石の回転角
度と強磁性磁気抵抗素子の出力の値との関係を示すグラ
フ、第７図は本発明の第２実施例にかかる強磁性磁気抵
抗素子を示す正面図である。 図中 １……非直線無接触ポテンショメータ、３、８……強磁
性磁気抵抗素子、４……円環板状磁石、５……回転軸、
６……ロータ（回転手段）、７……磁界、41……中心FIG. 1 is a side sectional view showing a non-linear contactless potentiometer using the first embodiment of the present invention, and FIG. 2 is a first sectional view of the present invention.
FIG. 3 is a front view showing a non-linear contactless potentiometer using an embodiment, FIG. 3 is a front view showing a ferromagnetic magnetoresistive element according to the first embodiment of the present invention, and FIG. 4 is a first embodiment of the present invention. FIG. 5 is a graph showing the relationship between the rotation angle of the magnetic field and the output value of the ferromagnetic magnetoresistive element. FIG. 5 shows the rotation angle of the annular plate magnet and the ferromagnetic magnetoresistive element according to the first embodiment of the present invention. Graph showing the relationship with the rotation angle of the applied magnetic field, 6th
FIG. 7 is a graph showing the relationship between the rotation angle of the annular plate-shaped magnet according to the first embodiment of the present invention and the output value of the ferromagnetic magnetoresistive element. FIG. 7 is a graph showing the relationship between the second embodiment of the present invention. It is a front view which shows a magnetic magnetoresistive element. In the figure, 1 ... Non-linear contactless potentiometer, 3, 8 ... Ferromagnetic magnetoresistive element, 4 ... Annular plate magnet, 5 ... Rotation axis,
6 ... Rotor (rotating means), 7 ... magnetic field, 41 ... center
フロントページの続き (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 (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Front page continuation (72) Inventor Toshikazu Matsushita, 1-1, Showa-cho, Kariya city, Aichi Prefecture, Nihon Denso Co., Ltd. (72) Inventor, Katsuhiko Ariga, 1-1, Showa-cho, Kariya city, Aichi prefecture, Nihondenso Co., Ltd.
Claims (1)
付着させてなる差動型強磁性磁気抵抗素子と、 該強磁性磁気抵抗素子と所定の間隔を隔てて平行的に配
置された放射状着磁の円環板状磁石と、 前記強磁性磁気抵抗素子の中心と円環板状磁石の中心と
の中間に設定した回転軸まわりに、前記円環板状磁石を
回転させ、前記強磁性磁気抵抗素子に作用する前記円環
板状磁石の磁界を偏向する回転手段とを備え、 前記磁界の回転角度を前記円環板状磁石の回転角度の所
定の角度に設定して、所定の非直線関数出力を発生させ
ることを特徴とするポテンショメータ。1. A differential type ferromagnetic magnetoresistive element, which is formed by adhering bent element bands of different directions on an insulating substrate, and is arranged in parallel with the ferromagnetic magnetoresistive element at a predetermined interval. Radially magnetized annular plate magnets, about the axis of rotation set between the center of the ferromagnetic magnetoresistive element and the center of the annular plate magnets, the annular plate magnets are rotated to Rotation means for deflecting the magnetic field of the annular plate-shaped magnet acting on the magnetic magnetoresistive element, and setting the rotation angle of the magnetic field to a predetermined angle of the rotation angle of the annular plate-shaped magnet, A potentiometer characterized by generating a non-linear function output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62016559A JPH084041B2 (en) | 1987-01-27 | 1987-01-27 | Potentiometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62016559A JPH084041B2 (en) | 1987-01-27 | 1987-01-27 | Potentiometer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63184375A JPS63184375A (en) | 1988-07-29 |
| JPH084041B2 true JPH084041B2 (en) | 1996-01-17 |
Family
ID=11919637
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62016559A Expired - Lifetime JPH084041B2 (en) | 1987-01-27 | 1987-01-27 | Potentiometer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH084041B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2579824Y2 (en) * | 1992-11-05 | 1998-09-03 | 株式会社三協精機製作所 | Magnetoresistive element |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS575067B2 (en) * | 1973-07-13 | 1982-01-28 |
-
1987
- 1987-01-27 JP JP62016559A patent/JPH084041B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63184375A (en) | 1988-07-29 |
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| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |