JPS58189501A - Magnetic head device - Google Patents
Magnetic head deviceInfo
- Publication number
- JPS58189501A JPS58189501A JP7226682A JP7226682A JPS58189501A JP S58189501 A JPS58189501 A JP S58189501A JP 7226682 A JP7226682 A JP 7226682A JP 7226682 A JP7226682 A JP 7226682A JP S58189501 A JPS58189501 A JP S58189501A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- scale
- magnetic head
- magnets
- bias
- 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.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
Abstract
Description
【発明の詳細な説明】
本発明は磁気スケール信号等の検出のために用いられる
磁気ヘッドｉ！蝋の改良に＠する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic head i! used for detecting magnetic scale signals, etc. @ for improving wax.
磁気スケール備考の一検出手段として強轟性金属磁気抵
抗薄膜本子又は牛導体礒気抵抗素子等の感磁素子にバイ
アス磁場を印加するようＫ１１ｌｊ成された磁気ヘッド
装置が使用されていること周知の通りである。It is well known that a magnetic head device configured to apply a bias magnetic field to a magnetic sensing element such as a strong metal magnetoresistive thin film element or a magnetic conductor resistance element is used as a detection means for magnetic scale notes. That's right.
しかる〈従来のこの稙ｔ２置は、バイアス磁場の印加の
ため卑−の磁石を感磁素子に付設する構造となっている
が、このような単一磁石によるバイアス磁場の印加力法
ではＦ９に望の磁場方向を正確に設定できない欠点があ
る。即ち１通常、磁石には形状Ａ７ｉ性或いは着出方向
の偏倚尋があって機械的ＩｆＣａ場方向が決まらないた
めである。However, the conventional t2 position has a structure in which a base magnet is attached to the magnetic sensing element to apply a bias magnetic field, but with this method of applying a bias magnetic field using a single magnet, it is difficult to reach F9. There is a drawback that the desired magnetic field direction cannot be set accurately. That is, 1. Usually, a magnet has a shape A7i or a bias in the direction of arrival and departure, and the direction of the mechanical IfCa field cannot be determined.
バイアス磁場方向が定まらないと、感Ｓ嵩子の出力が直
流偏倚したり、その隣り合う出方振幅が変動することに
なるが、これは磁気スケール梢廣を劣化させる原因にな
る。If the direction of the bias magnetic field is not determined, the output of the S-sensor will be biased to DC, and the amplitudes of adjacent outputs will fluctuate, which will cause deterioration of the width of the magnetic scale.
本発明はかかる従来技術の欠点を改良するため釦なされ
たもので、感ａ［子に対して少くとも２−の磁石を並列
に配設することＫより所定方向に半打バイアス磁場を印
加し得るように構成したことを％像とする。The present invention has been devised to improve the drawbacks of the prior art, and consists of arranging at least 2-magnets in parallel to the sensor and applying a half-stroke bias magnetic field in a predetermined direction. The % image is that it is configured so as to obtain.
以下図面に示す実施内を＃照して本発明を説明すると、
第１図及びｍ２図において、ｌはケース。The present invention will be described below with reference to the implementation shown in the drawings.
In Figure 1 and Figure m2, l is the case.
２はフロントカバー、３はケーブル、４は基板。2 is the front cover, 3 is the cable, and 4 is the board.
５は感磁素子、６及び７はバイアス８石である。5 is a magnetic sensing element, and 6 and 7 are 8 bias bias stones.
フロントカバー２はケースｌの上端に堰付けられていて
、このカバーの内側のケース内に基板４が設けられ℃い
る。基板４上には公知の感Ｓ本子５が形成されており、
その両側にはバイアス６石６及び７が並列に配設されて
いる。The front cover 2 is attached to the upper end of the case 1, and a board 4 is provided inside the case inside this cover. A known sensing element 5 is formed on the substrate 4,
Six bias stones 6 and 7 are arranged in parallel on both sides thereof.
感磁素子５はリードワイヤ８により接続港子９に接続さ
れており、該端子を介してケーブル３からのコード１０
Ｋ ！続されていて、感磁素子５からの検出信号が外
Ｎ５に取り出されるようになっている。The magnetic sensing element 5 is connected to a connection port 9 by a lead wire 8, and a cord 10 from the cable 3 is connected through the terminal.
K! The detection signal from the magnetic sensing element 5 is taken out to the outside N5.
またフロントカバー２は上記磁石６．７ＫＮ接すること
により図示の如く支持されている。これＫより本磁気ヘ
ッド装置と面対向している磁気スケール１１の検出面と
の間のクリアランスを著しく低減することができる。Further, the front cover 2 is supported as shown in the figure by being in contact with the magnet 6.7KN. Because of this K, the clearance between the present magnetic head device and the detection surface of the magnetic scale 11 facing each other can be significantly reduced.
磁気スケールの分解能を高めるために、磁気格子のピッ
チを煉かくすることは、検出回路の構成を簡易にする上
でも有効であるが、このように磁気格子のピッチを煉縮
すると、磁気記録の原理から明らかなように、磁気ヘッ
ドと磁気スケールの検出面間のクリアランスは減少させ
ざるを得ない。Increasing the pitch of the magnetic grating in order to increase the resolution of the magnetic scale is effective in simplifying the configuration of the detection circuit, but reducing the pitch of the magnetic grating in this way also improves magnetic recording. As is clear from the principle, the clearance between the magnetic head and the detection surface of the magnetic scale must be reduced.
従って上記実施例のよつＦＣ構成すればこの点から見て
も有利である。Therefore, the FC configuration of the above embodiment is advantageous from this point of view.
さて、前述したように感磁素子５には磁石６゜７によっ
て平行なバイアス磁場が印加される。従って感磁素子５
に印加されるバイアス出湯の方向を所定力ＩＫ正確に設
定できる。これにより磁石に形状異方性或いは着磁方向
のｉＪ！倫等があっても、バイアス磁場の方向を正確に
決めることができるから、従来のよ５Ｋ［Ｂ素子の出力
が直流偏倚したり、１ｌｊ１り合う出力蚕暢かに動−す
る欠点は解消し。Now, as mentioned above, a parallel bias magnetic field is applied to the magnetosensitive element 5 by the magnet 6.7. Therefore, the magnetic sensing element 5
The direction of bias tapping applied to the predetermined force IK can be accurately set. This gives the magnet shape anisotropy or magnetization direction iJ! Even if there is an error, the direction of the bias magnetic field can be determined accurately, which eliminates the disadvantages of the conventional 5K[B element, in which the output is DC biased and the outputs that match 1lj1 move smoothly. .
スケール積度が向上する。Improves scale efficiency.
第３図は本発明の他の実施例で、Ｓ石６，７を基板４の
ｊｕ＋ｇに取付けると共忙フロントカバー２の内側に突
起部１２．１３を設け℃ある。この突起部はプレス又は
金型等で成形して成るもので、これを基板４に対接させ
ることＫより前記実施例と同様にしてクリアランスを著
しく低減させて設定できる。また上配突起邸の内向は基
板４に対接する必要上、非導電性処理するか、もしくは
非導電性材料で形成する。FIG. 3 shows another embodiment of the present invention, in which projections 12 and 13 are provided on the inside of the front cover 2 when the S stones 6 and 7 are attached to the ju+g of the substrate 4. This protrusion is formed by a press or a mold, and by making it face the substrate 4, it can be set with a significantly reduced clearance in the same manner as in the previous embodiment. Further, since the inward portion of the upper protrusion needs to be in contact with the substrate 4, it is treated to be non-conductive or made of a non-conductive material.
本実施例においても感磁素子５に平行磁場を印加し得る
こと勿−である。Of course, a parallel magnetic field can also be applied to the magnetic sensing element 5 in this embodiment.
なおケース内はエポキシＩＩ＆等でモールド成形するの
が好ましい。Note that the inside of the case is preferably molded with epoxy II & the like.
以上説明したように本発明によれば感磁素子に対し所足
方向に１妬にバイアス磁場を目ｊ加することができ、ス
ケール読取り信号の偏倚が少な（なって、スケール積度
が向上し、また磁気ヘッド検出面と磁気スケール向との
関ハクリフランスを低減し得る効果もある。As explained above, according to the present invention, it is possible to apply a bias magnetic field to the magneto-sensitive element in the desired direction, and the deviation of the scale read signal is reduced (thereby, the scale integrality is improved). This also has the effect of reducing the separation distance between the magnetic head detection surface and the magnetic scale direction.
第１図及びｍ２図は本発明の一実一的を示す概略平向図
及び正面図、第３図は本発明の他の実論湾を示１軌略正
面図である。
１・・・ケース、２・・・フロントカバー、３・・・ケ
ーブル、４°・・基板、５・・・感磁素子、６，７・・
・バイアス磁石。
２Figures 1 and 2 are a schematic plan view and a front view showing the practical aspects of the present invention, and Figure 3 is a 1-track schematic front view showing another practical bay of the present invention. 1... Case, 2... Front cover, 3... Cable, 4°... Board, 5... Magnetic sensing element, 6, 7...
・Bias magnet. 2
Claims (1)
ｋ設し、均足方向に平行バイアス磁場を印加するようＫ
１１成したことを特徴とする磁気ヘッド装置。 （２３ｍ記感ａ素子及び１石は磁気スケール面に対、向
するように配置され、磁気ヘッド装置のフロントカバー
の内側が上記磁石によって支持されることにより、感ｉ
１素子の検出面とのクリアランスを設定したことを特徴
とする籍＃！Ｆ―求の範囲第１項記載の磁気ヘッド装置
。[Claims] (At least two magnets in parallel Kf for 11 sensors aX
K is set so that a parallel bias magnetic field is applied in the direction of uniform footing.
11. A magnetic head device characterized by the following. (The 23m sensing element and one stone are arranged to face the magnetic scale surface, and the inner side of the front cover of the magnetic head device is supported by the magnet, so that the sensing element is
#! The feature is that the clearance between one element and the detection surface is set! The magnetic head device according to item 1 of the F-required range.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7226682A JPS58189501A (en) | 1982-04-28 | 1982-04-28 | Magnetic head device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7226682A JPS58189501A (en) | 1982-04-28 | 1982-04-28 | Magnetic head device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58189501A true JPS58189501A (en) | 1983-11-05 |
| JPH0240161B2 JPH0240161B2 (en) | 1990-09-10 |
Family
ID=13484304
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7226682A Granted JPS58189501A (en) | 1982-04-28 | 1982-04-28 | Magnetic head device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58189501A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0568120A2 (en) * | 1990-01-25 | 1993-11-03 | RENISHAW plc | Position sensing probe |
| US5390424A (en) * | 1990-01-25 | 1995-02-21 | Renishaw Metrology Limited | Analogue probe |
| US5998989A (en) * | 1993-12-22 | 1999-12-07 | Itt Automotive Europe Gmbh | Device including magnet-biased magnetoresistive sensor and rotatable, magnetized encoder for detecting rotary movements |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5452567A (en) * | 1977-10-04 | 1979-04-25 | Sony Corp | Position detector |
-
1982
- 1982-04-28 JP JP7226682A patent/JPS58189501A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5452567A (en) * | 1977-10-04 | 1979-04-25 | Sony Corp | Position detector |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0568120A2 (en) * | 1990-01-25 | 1993-11-03 | RENISHAW plc | Position sensing probe |
| EP0568120A3 (en) * | 1990-01-25 | 1994-06-29 | Renishaw Plc | Position sensing probe |
| US5390424A (en) * | 1990-01-25 | 1995-02-21 | Renishaw Metrology Limited | Analogue probe |
| US5998989A (en) * | 1993-12-22 | 1999-12-07 | Itt Automotive Europe Gmbh | Device including magnet-biased magnetoresistive sensor and rotatable, magnetized encoder for detecting rotary movements |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0240161B2 (en) | 1990-09-10 |
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