JPH0249113A - Position detector - Google Patents
Position detectorInfo
- Publication number
- JPH0249113A JPH0249113A JP63198801A JP19880188A JPH0249113A JP H0249113 A JPH0249113 A JP H0249113A JP 63198801 A JP63198801 A JP 63198801A JP 19880188 A JP19880188 A JP 19880188A JP H0249113 A JPH0249113 A JP H0249113A
- Authority
- JP
- Japan
- Prior art keywords
- position detection
- magnetic
- zero point
- magnetoresistive element
- recording medium
- 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
- 238000001514 detection method Methods 0.000 claims abstract description 64
- 230000005291 magnetic effect Effects 0.000 claims abstract description 59
- 230000005294 ferromagnetic effect Effects 0.000 claims 1
- 239000010409 thin film Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Landscapes
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
- Hall/Mr Elements (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、磁気抵抗素子と繰シ返し磁気信号を発生する
磁気記録媒体とによって構成され微小長さ検出あるいは
微小回転検出等に使用される位置検出装置に関するもの
である。[Detailed Description of the Invention] [Industrial Application Field] The present invention is composed of a magnetoresistive element and a magnetic recording medium that repeatedly generates magnetic signals, and is used for minute length detection, minute rotation detection, etc. The present invention relates to a position detection device.
従来、この種の位置検出装置としては、例えば特公昭５
４−４１３３５号公報に開示されているように繰シ返し
磁気信号を発生する磁気記録媒体よシ有限の距離を隔て
た位置に磁気抵抗素子を直列に接続し、接続部よシ出力
を得ていた。Conventionally, as this type of position detection device, for example, the
As disclosed in Japanese Patent No. 4-41335, a magnetoresistive element is connected in series at a position separated by a finite distance from a magnetic recording medium that repeatedly generates magnetic signals, and an output is obtained from the connection part. Ta.
上述した従来の位置検出装置は、一定ピツチのＮ−８磁
極間隔の磁気記録媒体と、これに対応した特定の磁気抵
抗素子との組み合わせによって構成されるため、零点検
出および位置検出（微小角検出）の両方を同時に行うこ
とは不可能であシ、載板外に別のトラックに零点検出用
の着磁を行う必要がある。The conventional position detection device described above is configured by a combination of a magnetic recording medium with a constant pitch of N-8 magnetic poles and a specific magnetoresistive element corresponding to the magnetic recording medium. ) It is impossible to do both at the same time, and it is necessary to magnetize a separate track for zero point detection outside the plate.
したがって本発明は前述した従来の事情に鑑みてなされ
たものであシ、その目的は、零点検出および位Ｉｔ（微
小角）検出を同時に可能とした位置検出信号を提供する
ことにある。Therefore, the present invention has been made in view of the above-mentioned conventional circumstances, and its object is to provide a position detection signal that enables simultaneous zero point detection and position It (tiny angle) detection.
本発明による位置検出装置は、等間隔λでＮ−８極が着
磁された複数の位置検出用Ｎ−８磁極と１対のＮ−８磁
極がＮ−８極の間隔λに対して％λ十イλ十阿λの３対
に分割された零点検出用Ｎ−８磁極とを有する磁気記録
媒体と、磁気抵抗体間距離を（％＋ｎ）λ（ｎは整数）
とする位置検出用磁気抵抗素子と磁気抵抗体間距離を（
３Ａ ＋ Ｋ ｎ）λ（ｎは整数）とする零点検出用磁
気抵抗素子とを有する磁気抵抗素子とから構成される。The position detecting device according to the present invention has a plurality of position detecting N-8 magnetic poles in which the N-8 poles are magnetized at equal intervals λ, and a pair of N-8 magnetic poles that are arranged at % with respect to the interval λ between the N-8 poles. The distance between a magnetic recording medium having N-8 magnetic poles for zero point detection divided into three pairs of λ1 and λ10 and the magnetic resistor is (%+n)λ (n is an integer).
The distance between the position detection magnetoresistive element and the magnetoresistive element is (
3A + Kn)λ (n is an integer), and a magnetoresistive element for zero point detection.
〔作用〕
本発明においては、１組のＮ−８磁極が％λ＋イλ＋％
λの３対に分割され九Ｎ−８磁極と、素子間距離が（％
＋５Ａ１ｍ）λの零点検出用素子との組み合わせによシ
零点検出信号が得られる。[Function] In the present invention, one set of N-8 magnetic poles is %λ+iλ+%
It is divided into 3 pairs of λ and has 9N-8 magnetic poles, and the distance between the elements is (%
A zero point detection signal can be obtained by combining with a zero point detection element of +5A1m)λ.
次に図面を用いて本発明の実施例を詳細に説明する。 Next, embodiments of the present invention will be described in detail using the drawings.
第１図は本発明の一実施例による位置検出装置の構成を
示す要部平面図である。同図において、１は磁気記録媒
体であシ、この磁気記録媒体１には等間隔λでＮ−Ｓ極
を着磁して形成され九複数の位置検出用Ｎ−８磁極１人
間に、このＮ−８磁極１人を１対のＮ−Ｓ極間隔λに対
して％λ、イλ。FIG. 1 is a plan view of essential parts showing the configuration of a position detection device according to an embodiment of the present invention. In the same figure, 1 is a magnetic recording medium, and this magnetic recording medium 1 is formed by magnetizing N-S poles at equal intervals λ. %λ, iλ for one N-8 magnetic pole with respect to the spacing λ of a pair of N-S poles.
阿λの３対に分割して着磁して形成されたそれぞれＮ−
８磁極１ａｔｌｂｔｌｃ からなる零点検出用Ｎ−Ｓ
磁極１Ｂが配置されている。２．３．４は磁気記録媒体
１に有限の距離を隔てた位置に配設されたそれぞれ第１
の位置検出（微小角検出）用磁気抵抗素子、零点検出用
磁気抵抗素子、第２の位置検出（微小角検出）用磁気抵
抗素子であり、第１の位置検出用磁気抵抗素子２および
第２の位置検出用磁気抵抗素子４は、磁気記録媒体１の
Ｎ−８磁極１Ａの間隔λに対して磁気抵抗体間距離をそ
れぞれ（！Ｈ＋ｎ）λ（ｎは整数）および（３４＋ｔ）
λ（ｔは整数）の間隔を有しかつ互りに（−＋−５）λ
（Ｓは整数）の間隔を有して配置され、零点検出用磁気
抵抗素子３は磁気抵抗体距離を（３ｙｉ ＋ ３Ａ ｍ
）λ（ｍは整数）の間隔を有して配置されてそれぞれ
が直列に接続される。５，７．９は各磁気抵抗素子２，
３．４の入力端子、６．８．１０はそのグランド端子、
１１，１２．１３はその出力端子であシ、これらの出力
端子１１．１２ｉ３の中点電位は、磁気記録媒体１のＮ
−８磁極１ＡのＮ−Ｓ極間をπ（ｒａｄ）とする位相角
度θに対してＶ（θ）＝Ｋｃｏｓ２θ＋ｆ（θ）となる
関数で変化する。Each N-
N-S for zero point detection consisting of 8 magnetic poles 1atlbtlc
A magnetic pole 1B is arranged. 2.3.4 are the respective first magnetic recording mediums disposed at positions separated by a finite distance from the magnetic recording medium 1.
A magnetoresistive element for position detection (minor angle detection), a magnetoresistive element for zero point detection, a second magnetoresistive element for position detection (minor angle detection), and a first position detection magnetoresistive element 2 and a second The position detection magnetoresistive element 4 has a distance between the magnetoresistive elements of (!H+n)λ (n is an integer) and (34+t), respectively, with respect to the interval λ of the N-8 magnetic poles 1A of the magnetic recording medium 1.
with an interval of λ (t is an integer) and mutually (−+−5)λ
(S is an integer), and the zero point detection magnetoresistive element 3 has a magnetoresistive element distance of (3yi + 3A m
)λ (m is an integer) and are connected in series. 5, 7.9 are each magnetoresistive element 2,
3.4 input terminal, 6.8.10 is its ground terminal,
11, 12.13 are the output terminals, and the midpoint potential of these output terminals 11.12i3 is the N of the magnetic recording medium 1.
-8 It changes with a function of V(θ)=Kcos2θ+f(θ) with respect to the phase angle θ where π (rad) is between the N and S poles of the magnetic pole 1A.
このため、折シ返し部を各１個所有する２本の磁気抵抗
体よシなる各磁気抵抗素子２，３．４はθ＝′／２の位
相角を有した状態で配置される。この場合、中点電位Ｖ
（θ）の振巾が最大となるなおこれらの磁気抵抗素子２
，３，４は第２図に示すようにチップ１４上の同一領域
内く形成される。Therefore, each of the magnetoresistive elements 2, 3.4, which are two magnetoresistive bodies each having one folded portion, are arranged with a phase angle of θ='/2. In this case, the midpoint potential V
These magnetoresistive elements 2 have the maximum amplitude of (θ)
, 3 and 4 are formed in the same area on the chip 14 as shown in FIG.
このような構成において、例えば磁気記録媒体１が所定
の方向へ移動することによシ、各磁気抵抗素子２，３．
４には第３図に示すような出方電圧が得られる。すなわ
ち、同図（ａ）に示す磁気記録媒体１に対して第１．第
２の位置検出用磁気抵抗素子２，４は、Ｘ−Ｘ−Ｙ−Ｙ
’間でπ／２ 、 Ｙ −Ｙ’〜ｚ −ｚ’間では２π
（＝Ｏ）、Ｚ−Ｚ’〜ｗ−ｗ’間ではπ（＝０）となフ
、各磁気抵抗素子２，４を形成する各磁気抵抗体間に印
加される磁場の位相角に差がなくなるので、第１．第２
の位置検出用磁気抵抗素子２，４からそれぞれ同図（ｂ
）に示すような出力電圧Ｖ、、Ｖ、が得られる。ここで
これらの出力電圧ｖ１．■、には一部に小さな波形の歪
みが発生するが、これは第１．第２の位置検出用磁気抵
抗素子２．４に磁気記録媒体１中の零点検出用Ｎ−Ｓ磁
極１Ｂが通過する際に発生するものであり、その振幅電
圧ｖ１は同図（ｂ）に示すようにＶ、 、Ｖ、＞ｖｌ
となり、波形処理の際は無視できる。したがってこの出
力電圧Ｖ、 、Ｖ、を一定の電圧設定レベルＶ、で波形
処理することにょシ、同図（ｃ）に示すような矩形状の
位置検出信号Ｓ１が得られる。In such a configuration, for example, by moving the magnetic recording medium 1 in a predetermined direction, each magnetoresistive element 2, 3 .
4, an output voltage as shown in FIG. 3 is obtained. That is, for the magnetic recording medium 1 shown in FIG. The second position detection magnetoresistive elements 2 and 4 are X-X-Y-Y
π/2 between ' and 2π between Y - Y' and z - z'
(=O), π (=0) between Z-Z' and w-w', and there is a difference in the phase angle of the magnetic field applied between each magnetoresistive element forming each magnetoresistive element 2, 4. 1. Second
From the position detection magnetoresistive elements 2 and 4 of
), the output voltages V, , V, are obtained. Here, these output voltages v1. ③, small waveform distortion occurs in some parts, but this is due to the first. This is generated when the N-S magnetic pole 1B for zero point detection in the magnetic recording medium 1 passes through the second magnetoresistive element 2.4 for position detection, and its amplitude voltage v1 is shown in FIG. so that V, ,V,>vl
Therefore, it can be ignored during waveform processing. Therefore, by subjecting the output voltages V, ,V, to waveform processing at a constant voltage setting level V, a rectangular position detection signal S1 as shown in FIG. 2(c) is obtained.
方、零点検出用磁気抵抗素子３は、ｘ −ｘ’〜Ｙ−Ｙ
′間テｒｒ／４ 、 Ｙ −Ｙ’−Ｚ −Ｚ’間ではπ
（＝Ｑ）、Ｚ−２′〜ｗ−’ｗ’では１周期となり、こ
の磁気抵抗素子３を形成する磁気抵抗体間距離加される
磁場の位相角がπ力となるので、同図（ｄ）に示すよう
に出力電圧Ｖ、 、Ｖ、と同等の振幅レベルを有する出
力電圧ｖ８が得られる。したがってこの出力電圧ｖ８を
一定の電圧設定レベルＶ、で波形処理することＫよシ、
同図（、）に示すような矩形状の位置検出信号Ｓ、が得
られる。On the other hand, the zero point detection magnetoresistive element 3 has x −x′ to Y−Y
', terr/4, Y - Y' - Z - Z', π
(=Q), Z-2' to w-'w' constitutes one period, and the phase angle of the magnetic field applied to the distance between the magnetoresistive elements forming this magnetoresistive element 3 becomes π force, so the figure ( As shown in d), an output voltage v8 having the same amplitude level as the output voltages V, , V, is obtained. Therefore, it is better to process the waveform of this output voltage v8 at a constant voltage setting level V.
A rectangular position detection signal S as shown in the figure (,) is obtained.
以上説明したように本発明によれば、等間隔λでＮ−８
極が着磁された複数の位置検出用Ｎ−８磁極と１対のＮ
−８磁極がＮ−８極の間隔λに対してハλ＋％λ十阿λ
の３対に分割された零点検出用Ｎ−８磁極とを有する磁
気記録媒体と、磁気抵抗体間距離を（５４＋ｎ）λ（ｎ
は整数）とする位置検出用磁気抵抗素子と磁気抵抗体間
距離を（％＋イｎ）λ（ｎは整数）とする零点検出用磁
気抵抗素子とを有する磁気抵抗素子とから構成したこと
により、１組の磁気抵抗素子と磁気記録媒体との組み合
わせで零点検出および位置検出の両方が同時に実現可能
となるなどの極めて優れた効果が得られる。As explained above, according to the present invention, N-8
Multiple N-8 magnetic poles for position detection with magnetized poles and a pair of N
-8 magnetic poles are λ + % λ ten a λ for the spacing λ of N-8 poles
The distance between the magnetic recording medium having N-8 magnetic poles for zero point detection divided into three pairs and the magnetic resistance body is (54+n)λ(n
is an integer) and a magnetoresistive element for zero point detection has a distance between the magnetoresistive elements of (%+in)λ (n is an integer). By combining one set of magnetoresistive elements and a magnetic recording medium, extremely excellent effects such as both zero point detection and position detection can be achieved simultaneously can be obtained.
第１図は本発明の一実施例による位置検出装置の構成を
示す要部平面図、第２図は各磁気抵抗素子が形成された
チップを示す平面図、第３図（ｉ〜（、）は各磁気抵抗
素子の出力電圧の波形を説明する図である。
１・・・・磁気記録媒体、ＩＡ ・・・−位置検出用Ｎ
−８磁極、１Ｂ ・・・・零点検出用Ｎ−８磁極、１
ｍ、１ｂ、１ｃ −−・・Ｎ−Ｓ磁極、２・・・・第１
の位置検出用磁気抵抗素子、３・・・・零点検出用磁気
抵抗素子、４自・・第２の位置検出用磁気抵抗素子、５
，７．９・・・・大刀端子、６．８，１０・・・・グラ
ンド端子、１１゜１２．１３・・・・出力端子、１４・
・・・チップ。
特許出願人 日本電気株式会社
代理人 山川政樹（ｔピλ２名）FIG. 1 is a plan view of essential parts showing the configuration of a position detection device according to an embodiment of the present invention, FIG. 2 is a plan view showing a chip on which each magnetoresistive element is formed, and FIG. 1 is a diagram explaining the waveform of the output voltage of each magnetoresistive element. 1...Magnetic recording medium, IA...-N for position detection
-8 magnetic pole, 1B...N-8 magnetic pole for zero point detection, 1
m, 1b, 1c --... N-S magnetic pole, 2... 1st
Magnetoresistive element for position detection, 3... Magnetoresistive element for zero point detection, 4 Self... Magnetoresistive element for second position detection, 5
, 7.9... Tachi terminal, 6.8, 10... Ground terminal, 11° 12.13... Output terminal, 14...
...chip. Patent Applicant: NEC Corporation Agent Masaki Yamakawa (tPiλ2 people)
Claims (1)
と、Ｎ−Ｓ極が所定の間隔で着磁された複数のＮ−Ｓ磁
極を有する磁気記録媒体とを組み合わせて回転検出およ
び位置検出を行なう位置検出装置において、前記磁気記
録媒体は位置検出用Ｎ−Ｓ磁極のＮ−Ｓ極間隔λに対し
て１つのＮ−Ｓ磁極対を（１／４）λ＋（１／２）λ＋
（１／４）λの３対に分割された零点検出用Ｎ−Ｓ磁極
を有し、前記磁気抵抗素子は位置検出用磁気抵抗素子お
よび零点検出用磁気抵抗素子がチップ内のほぼ同一領域
内に形成され、かつ位置検出用磁気抵抗素子が磁気抵抗
体間距離を（（１／２）＋ｎ）λ（ｎは整数）の間隔を
有し、零点検出用磁気抵抗素子が磁気抵抗体間隔距離を
（１／４＋（１／２）ｎ）λ（ｎは整数）の間隔を有し
て両者の磁気抵抗素子が直列接続されるとともに各磁気
抵抗素子が互いに独立した入出力端子およびグランド端
子を有することを特徴とした位置検出装置。Rotation detection and position detection are performed by combining a magnetoresistive element having a magnetoresistive body made of a ferromagnetic thin film and a magnetic recording medium having a plurality of N-S magnetic poles magnetized at predetermined intervals. In the position detecting device, the magnetic recording medium has one N-S magnetic pole pair with respect to the N-S pole spacing λ of the N-S magnetic poles for position detection at (1/4)λ+(1/2)λ+
The magnetoresistive element has N-S magnetic poles for zero point detection divided into three pairs of (1/4)λ, and the magnetoresistive element for position detection and the magnetoresistive element for zero point detection are located in almost the same area within the chip. The magnetic resistance element for position detection has a distance between the magnetic resistance elements of ((1/2) + n) λ (n is an integer), and the magnetic resistance element for zero point detection has the distance between the magnetic resistance elements. Both magnetoresistive elements are connected in series with an interval of (1/4+(1/2)n)λ (n is an integer), and each magnetoresistive element has independent input/output terminals and ground terminals. A position detection device comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63198801A JPH0249113A (en) | 1988-08-11 | 1988-08-11 | Position detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63198801A JPH0249113A (en) | 1988-08-11 | 1988-08-11 | Position detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0249113A true JPH0249113A (en) | 1990-02-19 |
Family
ID=16397139
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63198801A Pending JPH0249113A (en) | 1988-08-11 | 1988-08-11 | Position detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0249113A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0540004A (en) * | 1990-02-21 | 1993-02-19 | Torrington Co:The | High resolution sensor device for internal combustion engine and manufacture thereof |
| JP2008066564A (en) * | 2006-09-08 | 2008-03-21 | Mitsubishi Electric Corp | Resin mold transformer |
| JP2009025286A (en) * | 2007-06-20 | 2009-02-05 | Sharp Corp | Optical encoder and electronic equipment |
| US7943897B2 (en) | 2007-06-20 | 2011-05-17 | Sharp Kabushiki Kaisha | Optical encoder and electronic equipment |
-
1988
- 1988-08-11 JP JP63198801A patent/JPH0249113A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0540004A (en) * | 1990-02-21 | 1993-02-19 | Torrington Co:The | High resolution sensor device for internal combustion engine and manufacture thereof |
| JP2008066564A (en) * | 2006-09-08 | 2008-03-21 | Mitsubishi Electric Corp | Resin mold transformer |
| JP2009025286A (en) * | 2007-06-20 | 2009-02-05 | Sharp Corp | Optical encoder and electronic equipment |
| US7943897B2 (en) | 2007-06-20 | 2011-05-17 | Sharp Kabushiki Kaisha | Optical encoder and electronic equipment |
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