JPH0240161B2 - - Google Patents
Info
- Publication number
- JPH0240161B2 JPH0240161B2 JP57072266A JP7226682A JPH0240161B2 JP H0240161 B2 JPH0240161 B2 JP H0240161B2 JP 57072266 A JP57072266 A JP 57072266A JP 7226682 A JP7226682 A JP 7226682A JP H0240161 B2 JPH0240161 B2 JP H0240161B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- scale
- sensing element
- bias
- front cover
- 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
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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
- Magnetic Heads (AREA)
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
いられる磁気ヘツド装置の改良に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a magnetic head device used for detecting magnetic scale signals and the like.
磁気スケール信号の一検出手段として強磁性金
属磁気抵抗薄膜素子又は半導体磁気抵抗素子等の
感磁素子にバイアス磁場を印加するように構成さ
れた磁気ヘツ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 magnetosensitive element such as a ferromagnetic metal magnetoresistive thin film element or a semiconductor magnetoresistive element is used as one means for detecting magnetic scale signals. .
磁気スケールの分解能を高めるためには、スケ
ールの記録ピツチを短くすることが有効な手段で
あるが、そのためにはスケールと磁気ヘツド装置
の検出間隔（クリアランス）を、より小さくする
ことが必要となる。 An effective way to increase the resolution of a magnetic scale is to shorten the recording pitch of the scale, but to do so, it is necessary to reduce the detection interval (clearance) between the scale and the magnetic head device. .
本発明は、感磁素子に対して少なくとも２個の
磁石を並列に配置することにより、平行バイアス
磁場を得てスケール検出精度を向上させ、かつ前
記平行磁場の使用により、磁場を強化して、１個
の場合に較べて１／２〜１／３の厚みでバイアス
磁場量が得られ、結果として前記感磁素子とほぼ
同一の厚みの磁石で所望の性能が得られるように
した状態で、前記スケールと磁気ヘツド装置との
クリアランスを小さくした構成を特徴としている
ものである。 The present invention improves scale detection accuracy by obtaining a parallel bias magnetic field by arranging at least two magnets in parallel with respect to a magnetic sensing element, and strengthens the magnetic field by using the parallel magnetic field. The amount of bias magnetic field can be obtained with a thickness of 1/2 to 1/3 compared to the case of one magnet, and as a result, the desired performance can be obtained with a magnet having almost the same thickness as the magnetic sensing element, The present invention is characterized by a structure in which the clearance between the scale and the magnetic head device is reduced.
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図及び第２図において、１はケー
ス、２はフロントカバー、３はケーブル、４は基
板、５は感磁素子、６及び７はバイアス磁石であ
る。 The present invention will be described below with reference to embodiments shown in the drawings. In FIGS. 1 and 2, 1 is a case, 2 is a front cover, 3 is a cable, 4 is a board, 5 is a magnetic sensing element, 6 and 7 is a bias magnet.
フロントカバー２はケース１の上端に取付けら
れていて、このカバーの内側のケース内に基板４
が設けられている。基板４上には公知の感磁素子
５が形成されており、その両側には感磁素子とほ
ぼ同じ厚みのバイアス磁石６及び７が並列に配設
されている。 A front cover 2 is attached to the upper end of the case 1, and a board 4 is placed inside the case inside this cover.
is provided. A known magnetic sensing element 5 is formed on the substrate 4, and bias magnets 6 and 7 having approximately the same thickness as the magnetic sensing element are arranged in parallel on both sides thereof.
感磁素子５はリードワイヤ８により接続端子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に接続されていて、感磁素子５か
らの検出信号が外部に取り出されるようになつて
いる。 The magnetic sensing element 5 is connected to a connecting terminal 9 by a lead wire 8.
It is connected to the cord 10 from the cable 3 via this terminal, so that the detection signal from the magnetically sensitive element 5 is taken out to the outside.
上記構成のように、フロントカバー２が感磁素
子５とほぼ同一の厚みのバイアス磁石６，７に対
接することにより、図示の如く、フロントカバー
２の位置を感磁素子５に対し、そのクリアランス
を最小の状態で正確に規定することができる。 As in the above configuration, the front cover 2 is brought into contact with the bias magnets 6 and 7 having approximately the same thickness as the magnetically sensitive element 5, so that the position of the front cover 2 is adjusted relative to the magnetically sensitive element 5 with a clearance as shown in the figure. can be accurately defined in the minimum state.
これにより、磁気スケールの検出精度を向上
し、かつバイアス磁石６，７により、フロントカ
バー２を感磁素子５に対し、最小のクリアランス
に規定できるので、その結果、磁気スケールと磁
気ヘツド装置とのクリアランスを減少することが
可能となる。 This improves the detection accuracy of the magnetic scale and allows the bias magnets 6 and 7 to provide the minimum clearance between the front cover 2 and the magnetic sensing element 5. As a result, the distance between the magnetic scale and the magnetic head device It becomes possible to reduce clearance.
磁気スケールの分解能を高めるために、磁気格
子のピツチを短くすることは、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
格子のピツチを短縮すると、磁気記録の原理から
明らかなように、磁気ヘツ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。 Shortening 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 shortening the pitch of the magnetic grating in this way violates the principles of magnetic recording. As is clear, the clearance between the magnetic head and the sensing surface of the magnetic scale must be reduced.
従つて上記実施例のように構成すればこの点か
ら見ても有利である。 Therefore, the configuration as in the above embodiment is advantageous from this point of view.
前述したように感磁素子５には磁石６，７によ
つて平行なバイアス磁場が印加される。従つて感
磁素子５に印加されるバイアス磁場の方向を所定
方向に正確に設定できる。これにより磁石に形状
異方性或いは着磁方向の偏倚等があつても、バイ
アス磁場の方向を正確に決めることができるか
ら、従来のように感磁素子の出力が直流偏倚した
り、隣り合う出力振幅が変動する欠点は解消し、
スケール精度が向上する。 As described above, a parallel bias magnetic field is applied to the magnetic sensing element 5 by the magnets 6 and 7. Therefore, the direction of the bias magnetic field applied to the magnetic sensing element 5 can be accurately set in a predetermined direction. As a result, even if the magnet has shape anisotropy or deviation in the magnetization direction, the direction of the bias magnetic field can be determined accurately. Eliminates the drawback of output amplitude fluctuation,
Improves scale accuracy.
なおケース内はエポキシ樹脂等でモールド成形
するのが好ましい。 Note that the inside of the case is preferably molded with epoxy resin or the like.
以上に説明したように、本発明によれば感磁素
子に対し所定方向に正確にバイアス磁場を印加す
ることができ、スケール読取り信号の偏倚が少な
くなつて、スケール精度が向上し、また磁気ヘツ
ド検出面と磁気スケール面との間のクリアランス
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 accurately in a predetermined direction to the magnetic sensing element, the deviation of the scale read signal is reduced, the scale accuracy is improved, and the magnetic head It also has the effect of reducing the clearance between the detection surface and the magnetic scale surface.
第１図及び第２図は本発明の一実施例を示す概
略平面図及び正面図である。
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、８……リードワイヤ、９……
接続端子、１０……コード、１１……磁気スケー
ル。
1 and 2 are a schematic plan view and a front view showing an embodiment of the present invention. 1...Case, 2...Front cover, 3...
Cable, 4... Board, 5... Magnetic sensing element, 6, 7
...Bias magnet, 8...Lead wire, 9...
Connection terminal, 10...cord, 11...magnetic scale.
Claims (1)
列に配設し、所定方向に平行バイアス磁場を印加
するように構成し、前記感磁素子及び磁石は磁気
スケール面に対向するように配置され、磁気ヘツ
ド装置のフロントカバーの内側が上記磁石によつ
て支持されることにより、感磁素子の検出面との
クリアランスを設定したことを特徴とする磁気ヘ
ツド装置。1 At least two magnets are arranged in parallel to the magneto-sensitive element, configured to apply a parallel bias magnetic field in a predetermined direction, and the magneto-sensor element and the magnet are arranged to face the magnetic scale surface. A magnetic head device, characterized in that the inner side of the front cover of the magnetic head device is supported by the magnet, thereby setting a clearance between the front cover and the detection surface of the magnetic sensing element.
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 JPS58189501A (en) | 1983-11-05 |
| JPH0240161B2 true 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) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5390424A (en) * | 1990-01-25 | 1995-02-21 | Renishaw Metrology Limited | Analogue probe |
| GB9001682D0 (en) * | 1990-01-25 | 1990-03-28 | Renishaw Plc | Position sensing probe |
| JPH09510775A (en) * | 1993-12-22 | 1997-10-28 | アイティーティー・オートモーティブ・ヨーロップ・ゲーエムベーハー | Device for detecting rotational or angular movement |
Family Cites Families (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
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58189501A (en) | 1983-11-05 |
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