JPH068735B2 - Magnetic head - Google Patents
Magnetic headInfo
- Publication number
- JPH068735B2 JPH068735B2 JP30240686A JP30240686A JPH068735B2 JP H068735 B2 JPH068735 B2 JP H068735B2 JP 30240686 A JP30240686 A JP 30240686A JP 30240686 A JP30240686 A JP 30240686A JP H068735 B2 JPH068735 B2 JP H068735B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- head
- heads
- gap
- magnetic head
- 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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- Transmission And Conversion Of Sensor Element Output (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は磁気スケール用磁気ヘッドに係わり、特に一定
波長で磁気格子を記録した磁気スケールに対する相対変
位に応じて、常時正確に９０゜位相差を有する２チャン
ネルの正弦波状信号を取り出せるように構成した磁気ヘ
ッドの改良に関する。Description: TECHNICAL FIELD The present invention relates to a magnetic head for a magnetic scale, and in particular to a 90 ° phase difference which is always accurately 90 ° depending on a relative displacement with respect to a magnetic scale on which a magnetic grating is recorded at a constant wavelength. The present invention relates to an improvement of a magnetic head configured so as to extract a two-channel sinusoidal signal having a magnetic field.
［発明の概要］ ２個のマルチギャップヘッドを有しており、夫々のヘッ
ドは磁気スケールに対する相対変位に応じて位相の異な
る２相信号を発生し、この２相信号が両方のマルチギャ
ップヘッド間で電気的又は磁気的に加算あるいは減算さ
れて常時９０゜位相の異なる正弦波状の電気信号を発生
するようになっている磁気ヘッドである。[Summary of the Invention] The present invention has two multi-gap heads, and each head generates two-phase signals having different phases according to the relative displacement with respect to the magnetic scale. It is a magnetic head which is always electrically or magnetically added or subtracted to generate sinusoidal electric signals having 90 ° different phases.
［従来の技術］ 比較的粗い波長（一般的には０．２mm）で磁気格子を記
録した磁気スケールから精密かつ高精度な位置読取りを
行うためには、２チャンネルのマルチギャップヘッド
を、磁気格子記録波長λに対して正しく （但しｎは整数）の関係を保持するように配設し、電気
的に正確な９０゜の位相差を有する２チャンネルの電気
信号を取り出す必要があった。[Prior Art] In order to perform precise and highly accurate position reading from a magnetic scale on which a magnetic grating is recorded at a relatively coarse wavelength (generally 0.2 mm), a 2-channel multi-gap head is used. Correct for recording wavelength λ It was necessary to arrange so as to maintain the relationship (where n is an integer), and to take out two channels of electrical signals having an electrically accurate phase difference of 90 °.
しかしながら、上記マルチギャップヘッドを構成する磁
気コア素材の厚みのばらつきあるいはその組立方法等の
制約から前記２チャンネルの電気信号間に正確に９０゜
の位相差を持たせたような磁気ヘッドを実現することは
困難であった。However, due to variations in the thickness of the magnetic core material constituting the multi-gap head or restrictions on the method of assembling the magnetic core material, a magnetic head having a 90 ° phase difference between the electric signals of the two channels is realized. It was difficult.
そこでこれらの不具合を解決するため、例えば特公昭５
５−３８６０１号に開示されたように前記２チャンネル
の電気信号の位相差が９０゜に対して一定のばらつき範
囲内に納まるように上記マルチギャップヘッド間にスペ
ーサを介在させる方法、又は特公昭５０−２５８１７号
に記載されている如く、上記位相差の理想値９０゜に対
する偏差を電気的に補正する方法が提案されている。Therefore, in order to solve these problems, for example, Japanese Patent Publication Sho 5
As disclosed in JP-A-5-38601, a method of interposing a spacer between the multi-gap heads so that the phase difference between the electric signals of the two channels falls within a certain variation range with respect to 90 °, or Japanese Patent Publication No. No. 25817, there is proposed a method of electrically correcting the deviation of the phase difference from the ideal value of 90 °.
［発明が解決しようとする問題点］ 而して上述した前者の方法によると、スペーサを使用し
た前記位相差の調整に手間と時間を要するので比能率的
であり、かつ部品点数が多くなるので、コスト高とな
る。[Problems to be Solved by the Invention] According to the former method described above, it takes a lot of time and effort to adjust the phase difference using the spacer, which is efficient and increases the number of parts. , Costly.
また後者の方法では、前記補正のための余分な回路が必
要となりコスト高となるとともにスケール波長内を細か
く分割して内挿処理を行い精密なスケール信号の読取り
を行う過程で、前記２チャンネルの信号の位相差が略９
０゜に保持されていないと電気的に補正した後でも誤差
が混入することになるので、可能な限り正確に９０゜の
位相差を有する２チャンネルの電気信号を出力し得る磁
気ヘッドの実現が前提となる。Further, in the latter method, an extra circuit for the correction is required, resulting in a high cost, and in the process of finely dividing the scale wavelength and performing an interpolation process to precisely read the scale signal, the two channels The signal phase difference is about 9
If it is not held at 0 °, an error will be mixed in even after it is electrically corrected. Therefore, it is possible to realize a magnetic head capable of outputting 2-channel electric signals having a phase difference of 90 ° as accurately as possible. It is a prerequisite.
従って本発明の目的は常時正確に９０゜の位相差を有す
る２チャンネルの正弦波状の電気信号を発生し、位相調
整不要で高精度なスケール信号の読取りを可能とする磁
気スケール用の磁気ヘッドを提供するにある。Therefore, an object of the present invention is to provide a magnetic head for a magnetic scale, which constantly generates a two-channel sinusoidal electric signal having a phase difference of 90 ° and which enables highly accurate reading of a scale signal without phase adjustment. To provide.
［問題点を解決するための手段］ 本発明の磁気ヘッドは上記目的を達成するため、磁気ス
ケールに対する相対変位に応じて位相の異なる２相信号
を発生するように配設した少なくとも２個のマルチギャ
ップヘッドを備え、各ヘッドには少なくとも２組の出力
信号発生手段が設けられ、かつ上記マルチギャップヘッ
ド間で上記２相信号が磁気的又は電気的に加算あるいは
減算されて、新たな２チャンネルの出力信号発生手段が
構成され、上記出力信号発生手段から常時９０゜位相の
異なる電気信号を発生するように構成したことを特徴と
する。[Means for Solving the Problems] In order to achieve the above object, the magnetic head of the present invention has at least two multi heads arranged so as to generate two-phase signals having different phases according to the relative displacement with respect to the magnetic scale. A gap head is provided, each head is provided with at least two sets of output signal generating means, and the two-phase signals are magnetically or electrically added or subtracted between the multi-gap heads to provide new two-channel signals. The output signal generating means is constituted so that the output signal generating means always generates electric signals having a phase difference of 90 °.
［作用］ 本発明の磁気ヘッドから出力される２チャンネルの信号
の位相差は常時９０゜に保持されている。従って前記内
挿処理の過程での誤差混入を避けることができる。また
本発明の磁気ヘッドを構成する磁気コア素材の厚みのば
らつきの許容度が上がり、素材単価を低減できると共に
位相調整のための調整工程が不要になる等により、上記
ヘッドの低コスト化が実現される。[Operation] The phase difference between the signals of the two channels output from the magnetic head of the present invention is always maintained at 90 °. Therefore, it is possible to avoid mixing of errors in the process of the interpolation processing. Further, the tolerance of the variation in the thickness of the magnetic core material constituting the magnetic head of the present invention is increased, the material unit price can be reduced, and the adjustment process for phase adjustment is not necessary. To be done.
［発明の実施例］ 以下図面に示す実施例を参照して本発明を説明すると、
第１図は本発明による磁気ヘッドの一実施例の原理的構
成を示す。BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below with reference to the embodiments shown in the drawings.
FIG. 1 shows the basic configuration of an embodiment of a magnetic head according to the present invention.
同図において、Ａ1及びＡ2は第１のマルチギャップヘッ
ドＡを構成する単位ヘッド、Ｂ1及びＢ2は第２のマルチ
ギャップヘッドＢを構成する単位ヘッド、ＭＳは磁気ス
ケールである。単位ヘッドＡ1のコイルＬＡ1とＢ1のコ
イルＬＢ1が各々の出力が加算されるように接続され、
単位ヘッドＡ２のコイルＬＡ2とＢ2のコイルＬＢ2が各
々の出力が減算されるように接続されている。単位ヘッ
ドＡ1とＡ2及びＢ1とＢ2の出力電圧をｅA1，ｅA2及びｅ
ｅB1，ｅB2とすると各々の単位ヘッドは同相且つ等しい
出力電圧を発生するように近接して配設しているので各
単位ヘッドの出力電圧は次のように表すことができる。In the figure, A 1 and A 2 are unit heads constituting the first multi-gap head A, B 1 and B 2 are unit heads constituting the second multi-gap head B, and MS is a magnetic scale. Coil LA 1 and the coil LB 1 of B 1 unit heads A 1 is connected to each output of the adder,
Coil LB 2 of the coil LA 2 and B 2 of unit heads A 2 are connected to each output of the subtraction. The output voltages of the unit heads A 1 and A 2 and B 1 and B 2 are e A1 , e A2 and e
Assuming that e B1 and e B2 , the unit heads are arranged close to each other so as to generate the same phase and the same output voltage, the output voltage of each unit head can be expressed as follows.
ｅA1＝ｅA2＝ｅA (１) ｅB1＝ｅB2＝ｅB (２) ｜ｅA｜＝｜ｅB （３） ここで、磁気スケールＭＳの記録波長λに対して第１及
び第２のマルチギャップヘッドＡ，Ｂの間隔をｎλ＋
ｄ、相対位置をｘとすると、各単位ヘッドに発生する出
力電圧は次のように表すことができる。e A1 = e A2 = e A (1) e B1 = e B2 = e B (2) | e A | = | e B (3) Here, the first and the first with respect to the recording wavelength λ of the magnetic scale MS. The distance between the two multi-gap heads A and B is nλ +
The output voltage generated in each unit head can be expressed as follows, where d is the relative position and x is the relative position.
すなわち、第１及び第２のマルチギャップヘッドＡ，Ｂ
の出力電圧は振幅が等しく各々位相がαだけ異なる２相
信号である。 That is, the first and second multi-gap heads A and B
The output voltages of are two-phase signals having the same amplitude and different phases by α.
次に上記マルチギャップヘッドＡ，Ｂ間で加算又は減算
的に接続された新たな２チャンネルの出力電圧をｅ1，
ｅ2とすると、 上記出力電圧ｅ1，ｅ2の間の位相差をθとすると、 上式から明らかなように、出力電圧ｅ1とｅ2の間の位相
差θは、第１及び第２のマルチギャップヘッドＡ，Ｂの
出力電圧ｅAとｅBとの間の位相差αの如何に係わらず常
時９０゜を保持する。Next, output voltages of new two channels connected additively or subtractively between the multi-gap heads A and B are e 1 ,
If we say e 2 , If the phase difference between the output voltages e 1 and e 2 is θ, As is clear from the above equation, the phase difference θ between the output voltages e 1 and e 2 is the phase difference α between the output voltages e A and e B of the first and second multi-gap heads A and B. Regardless of, always keep 90 °.
本発明の動作原理は第２図に示すベクトル図からも容易
に理解できるであろう。The operating principle of the present invention can be easily understood from the vector diagram shown in FIG.
また、両マルチギャップヘッドのＡ1とＡ2の間隔、Ｂ1
とＢ2の間隔は各々磁気スケールの記録波長λの整数倍
として同相の出力電圧を得ていたが、上記間隔は１／２
λの整数倍としても構成できる。但しこの場合は各単位
ヘッド間の出力電圧の位相が１８０゜異なるため、ｅ1
の出力電圧を得るためには単位ヘッドＢ1のコイルの接
続方向を逆にし、ｅ2の出力電圧を得るためには単位ヘ
ッドＢ2のコイルの接続方向を順方向（第１図とは逆方
向）に変更する必要がある。Also, the distance between A 1 and A 2 of both multi-gap heads, B 1
The output voltage of the same phase was obtained by setting the interval between B 2 and B 2 as an integral multiple of the recording wavelength λ of the magnetic scale.
It can also be configured as an integral multiple of λ. However, in this case, the phase of the output voltage between the unit heads differs by 180 °, so e 1
In order to obtain the output voltage of the unit head B 1 , the connecting direction of the coil of the unit head B 1 is reversed, and in order to obtain the output voltage of e 2 , the connecting direction of the coil of the unit head B 2 is the forward direction (reverse to that of FIG. Direction).
上記実施例では第１，第２のマルチギャップヘッドを２
個の単位ヘッドで構成するとしたが、これは２ｍ個の単
位ヘッドで構成してもよい。In the above embodiment, the first and second multi-gap heads are
Although it has been described that the unit heads are used, the number of unit heads may be 2m.
第３図は本発明の他の実施例で、第１のマルチギャップ
ヘッドＡの磁気ヨーク部ＭＡ1と第２のマルチギャップ
ヘッドＢの磁気ヨーク部ＭＢ1とを可飽和コアＭ1で接続
し、各磁気ヨーク部に流入する磁束が可飽和コアＭ1で
加算されるようになっている。FIG. 3 shows another embodiment of the present invention in which the magnetic yoke portion MA 1 of the first multi-gap head A and the magnetic yoke portion MB 1 of the second multi-gap head B are connected by a saturable core M 1. The magnetic fluxes flowing into the respective magnetic yoke parts are added by the saturable core M 1 .
同様に第１のマルチギャップヘッドＡの磁気ヨーク部Ｍ
Ａ2と第２のマルチギャップヘッドＢの磁気ヨーク部Ｍ
Ｂ2とを可飽和コアＭ2で接続し、各磁気ヨーク部に流入
する磁束が可飽和コアＭ2で減算されるようになってい
る。Similarly, the magnetic yoke portion M of the first multi-gap head A is
A 2 and the magnetic yoke portion M of the second multi-gap head B
B 2 and S 2 are connected by a saturable core M 2 , and the magnetic flux flowing into each magnetic yoke portion is subtracted by the saturable core M 2 .
従って可飽和コアＭ1，Ｍ2に信号巻線Ｌ1，Ｌ2を巻装す
ることにより、上記加算又は減算された磁束に対応する
２チャンネルの出力電圧を発生する磁束応答型の磁気ヘ
ッドが得られる。Therefore, by winding the signal windings L 1 and L 2 around the saturable cores M 1 and M 2 , a magnetic flux response type magnetic head that generates a two-channel output voltage corresponding to the added or subtracted magnetic flux is provided. can get.
上記説明を数式で説明すると次のようになる。The above description can be described as mathematical expressions as follows.
今、各ヘッドの磁気ヨーク部ＭＡ1〜ＭＢ2に流れる磁束
をφA1，φA2，φB1，φB2とし、可飽和コアＭ1，Ｍ2に
流入する磁束をφ1，φ2とすると、 φ1＝φA1＋φB1 (８) φ2＝φA2−φB2 (９) となる。ここで上記磁気ヨーク及び可飽和コアを φA1＝φA2＝φA (10) φB1＝φB2＝φB (11) となるようにすると、 φ1＝φA＋φB (12) φ2＝φA−φB (13) の磁束が流入する。Now, assuming that the magnetic fluxes flowing in the magnetic yoke parts MA 1 to MB 2 of each head are φ A1 , φ A2 , φ B1 , and φ B2, and the magnetic fluxes flowing into the saturable cores M 1 and M 2 are φ 1 and φ 2. , Φ 1 = φ A1 + φ B1 (8) φ 2 = φ A2 −φ B2 (9) Here, if the magnetic yoke and the saturable core are set to φ A1 = φ A2 = φ A (10) φ B1 = φ B2 = φ B (11), φ 1 = φ A + φ B (12) φ 2 = Φ A −φ B The magnetic flux of (13) flows in.
そしてここで、磁束φA,φBはスケール信号に対応し、
前記出力電圧が磁束φ1,φ2に対応しているので、(12)
及び(13)式が前記ｅ1,e2と全く等価なこと明らかであ
る。And here, the magnetic fluxes φ A and φ B correspond to the scale signal,
Since the output voltage corresponds to the magnetic flux φ 1 and φ 2 , (12)
It is clear that the expressions (13) and (13) are completely equivalent to the above e 1 and e 2 .
［発明の効果］ 以上説明した所から明らかなように本発明によれば、本
発明の磁気ヘッドの２チャンネルの出力電圧は常に９０
゜の位相差を保持するので、内挿処理時において誤差を
誘発せず、高精度の磁気スケール信号の読取りを行うこ
とができる。[Effect of the Invention] As is apparent from the above description, according to the present invention, the output voltage of two channels of the magnetic head of the present invention is always 90.
Since the phase difference of .degree. Is held, it is possible to read the magnetic scale signal with high accuracy without inducing an error during the interpolation processing.
また本発明の磁気ヘッドを構成する磁気コア素材の厚み
のばらつきの許容度が上がるので、素材単価の低減によ
り低コスト化を図ることができる。Further, since the tolerance of the variation in the thickness of the magnetic core material constituting the magnetic head of the present invention is increased, it is possible to reduce the cost by reducing the unit price of the material.
更に２チャンネルの出力電圧間の位相差を一定の許容範
囲内に入るようにするための調整工程及びその調整用の
スペーサが不要となるので、この点からも低コスト化が
図られ、能率的になる。Further, an adjustment process for keeping the phase difference between the output voltages of the two channels within a certain allowable range and a spacer for the adjustment are not required, so that the cost can be reduced and the efficiency can be improved. become.
第１図は本発明の一実施例の原理的構成を示す略線図、
第２図はその動作説明用ベクトル図、第３図は本発明の
他の実施例の要部を示す概略斜視図である。 Ａ,Ｂ・・・第１，第２のマルチギャップヘッド、Ａ1〜
Ｂ2・・・単位ヘッド。FIG. 1 is a schematic diagram showing the principle configuration of an embodiment of the present invention,
FIG. 2 is a vector diagram for explaining the operation, and FIG. 3 is a schematic perspective view showing the main part of another embodiment of the present invention. A, B ... First and second multi-gap heads, A 1 to
B 2 ... Unit head.
Claims (2)
相の異なる２相信号を発生するように配設した少なくと
も２個のマルチギャップヘッドを備え、各ヘッドには少
なくとも２組の出力信号発生手段が設けられ、かつ上記
マルチギャップヘッド間で上記２相信号が磁気的又は電
気的に加算あるいは減算されて、新たな２チャンネルの
出力信号発生手段が構成され、上記出力信号発生手段か
ら常時９０゜位相の異なる電気信号を発生するように構
成したことを特徴とする磁気ヘッド。1. At least two multi-gap heads are provided so as to generate two-phase signals having different phases according to relative displacement with respect to a magnetic scale, and each head has at least two sets of output signal generating means. A new two-channel output signal generating means is provided by magnetically or electrically adding or subtracting the two-phase signals between the multi-gap heads, and the output signal generating means always provides a 90 ° phase. A magnetic head characterized in that the magnetic head is configured to generate different electric signals.
られた可飽和コア部において、上記２相信号が磁気的な
加算又は減算が行われるように構成されたことを特徴と
する特許請求の範囲第１項記載の磁気ヘッド。2. A saturable core portion provided commonly to each of the multi-gap heads, wherein the two-phase signals are magnetically added or subtracted. The magnetic head according to item 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30240686A JPH068735B2 (en) | 1986-12-18 | 1986-12-18 | Magnetic head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30240686A JPH068735B2 (en) | 1986-12-18 | 1986-12-18 | Magnetic head |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63153423A JPS63153423A (en) | 1988-06-25 |
| JPH068735B2 true JPH068735B2 (en) | 1994-02-02 |
Family
ID=17908532
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30240686A Expired - Lifetime JPH068735B2 (en) | 1986-12-18 | 1986-12-18 | Magnetic head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH068735B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4833693B2 (en) * | 2006-03-09 | 2011-12-07 | 古河電気工業株式会社 | Twisted wire manufacturing method and apparatus |
| FR2904412B1 (en) * | 2006-07-27 | 2008-10-17 | Snr Roulements Sa | METHOD FOR DETERMINING TWO QUADRATURE SIGNALS |
-
1986
- 1986-12-18 JP JP30240686A patent/JPH068735B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63153423A (en) | 1988-06-25 |
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