JPH03260902A - Magnetic disk device - Google Patents
Magnetic disk deviceInfo
- Publication number
- JPH03260902A JPH03260902A JP5805590A JP5805590A JPH03260902A JP H03260902 A JPH03260902 A JP H03260902A JP 5805590 A JP5805590 A JP 5805590A JP 5805590 A JP5805590 A JP 5805590A JP H03260902 A JPH03260902 A JP H03260902A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic disk
- head
- magnetic
- rotational speed
- speed
- 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
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
- G11B19/02—Control of operating function, e.g. switching from recording to reproducing
- G11B19/04—Arrangements for preventing, inhibiting, or warning against double recording on the same blank or against other recording or reproducing malfunctions
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B2005/0002—Special dispositions or recording techniques
- G11B2005/0005—Arrangements, methods or circuits
- G11B2005/001—Controlling recording characteristics of record carriers or transducing characteristics of transducers by means not being part of their structure
- G11B2005/0013—Controlling recording characteristics of record carriers or transducing characteristics of transducers by means not being part of their structure of transducers, e.g. linearisation, equalisation
- G11B2005/0016—Controlling recording characteristics of record carriers or transducing characteristics of transducers by means not being part of their structure of transducers, e.g. linearisation, equalisation of magnetoresistive transducers
- G11B2005/0018—Controlling recording characteristics of record carriers or transducing characteristics of transducers by means not being part of their structure of transducers, e.g. linearisation, equalisation of magnetoresistive transducers by current biasing control or regulation
Landscapes
- Recording Or Reproducing By Magnetic Means (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
〔概要〕
磁気ディスクを用いてデータの磁気記録及び再生を行な
う磁気ディスク装置に関し、
再生ヘッドのコイルの巻き数やコア幅を増大させること
なく再生出力電圧を増大させることを目的とし、
上述のような磁気ディスク装置において、供給される電
流と磁気抵抗とによりデータを再生する磁気抵抗効果型
磁気ヘッドと、上記磁気ディスクの回転速度が所定速度
に達することを検出する検出手段と、検出手段で上記回
転速度が所定速度に達したことが検出された時に上記磁
気抵抗効果型磁気ヘッドに電流を供給する電流供給手段
とを設は構成する。[Detailed Description of the Invention] [Summary] Regarding a magnetic disk device that performs magnetic recording and reproduction of data using a magnetic disk, an object of the present invention is to increase the reproduction output voltage without increasing the number of coil turns or the core width of the reproduction head. In a magnetic disk device as described above, the present invention includes a magnetoresistive magnetic head that reproduces data using a supplied current and magnetic resistance, and a detection device that detects when the rotational speed of the magnetic disk reaches a predetermined speed. and current supply means for supplying current to the magnetoresistive magnetic head when the detection means detects that the rotational speed has reached a predetermined speed.
本発明は磁気ディスクを用いてデータの磁気記録及び再
生を行なう磁気ディスク装置に関する。The present invention relates to a magnetic disk device that magnetically records and reproduces data using a magnetic disk.
従来、磁気ディスク装置の磁気ヘッドとして第３図に示
す巻線型ヘッドがある。2. Description of the Related Art Conventionally, there is a wire-wound type head shown in FIG. 3 as a magnetic head for a magnetic disk device.
この巻線型ヘッドは同図に示すように先端にギャップ１
１の設けられたコア（磁心）１２にコイル１３が巻かれ
た構造となっている。そしてこのギャップ１１が磁気デ
ィスク１４上でデータが磁気記録された部分の上方を通
過すると、その磁場の影響を受けてコイル１３内を通過
する磁束が変化し、電磁誘導によりコイル１３に再生出
力電圧が発生する。このため、この巻線型ヘッドの再生
出力電圧はコイル１３の巻き数及びコア１２の幅に比例
する。This wire-wound head has a gap of 1 at the tip as shown in the figure.
It has a structure in which a coil 13 is wound around a core (magnetic core) 12 provided with a coil 13. When this gap 11 passes above the area where data is magnetically recorded on the magnetic disk 14, the magnetic flux passing through the coil 13 changes under the influence of the magnetic field, and the reproduction output voltage is applied to the coil 13 by electromagnetic induction. occurs. Therefore, the reproduction output voltage of this wire-wound head is proportional to the number of turns of the coil 13 and the width of the core 12.
ところで近年、磁気ディスク装置ではデータの高記録密
度化及び高速アクセス化が進み、磁気ディスク上におけ
る記録波長が短くなると共にヘッドが小型化する傾向が
あった。記録波長が短くなり、しかもヘッドが小さくな
れば必然的に再生出力電圧が低下するので、少しても再
生出力電圧を向上させることが望まれている。Incidentally, in recent years, data recording density and high-speed access have been increased in magnetic disk devices, and there has been a tendency for recording wavelengths on magnetic disks to become shorter and heads to become smaller. As the recording wavelength becomes shorter and the head becomes smaller, the reproduction output voltage inevitably decreases, so it is desired to improve the reproduction output voltage even if only a little.
しかし従来の巻線型磁気ヘッドを使用した磁気ディスク
装置にあっては、再生出力を大きくするためコイルの巻
き数やコア幅を増大させると、ヘッドの重量が重くなっ
たり、またヘッド製造工程において工数が増大すると同
時に歩留りが悪くなるという問題が生じる。However, in magnetic disk drives that use conventional wire-wound magnetic heads, increasing the number of coil turns and core width in order to increase playback output increases the weight of the head and requires more man-hours in the head manufacturing process. The problem arises that as the amount increases, the yield deteriorates.
そこで本発明は、コイルの巻き数やコア幅を増大させる
ことなくヘッドの再生電圧を増大させることができる磁
気ディスク装置を提供することを目的とする。SUMMARY OF THE INVENTION An object of the present invention is to provide a magnetic disk device that can increase the read voltage of the head without increasing the number of turns of the coil or the width of the core.
（課題を解決するための手段）
本発明にあって上記の課題を解決するための手段は、第
１図に示すように、磁気ディスク１を用いてデータの磁
気記録及び再生を行なう磁気ディスク装置において、供
給される電流と磁気抵抗とにより上記磁気ディスク１か
らデータを再生する磁気抵抗効果型磁気へラド２と、上
記磁気ディスク１の回転速度が所定速度に達することを
検出する検出手段３と、検出手段３で上記回転速度が所
定速度に達したことが検出された時に磁気抵抗効果型磁
気ヘッド２に電流を供給する電流供給手段４とを設けた
ことにある。尚、磁気抵抗効果型磁気ヘッドとは磁気抵
抗効果素子を用い、磁気抵抗効果により再生電圧を得る
磁気ヘッドのことない〔作用〕
本発明によれば、磁気抵抗効果型磁気ヘッド２を再生ヘ
ッドとして使用したので、通常の磁気ディスク装置に使
用されている巻線型ヘッドより高い再生出力が得られる
。また、検出手段３が磁気ディスク１の回転速度が所定
速度、例えばデータ再生時の定常回転速度になるのを検
出しており、磁気ディスク１がこの速度に達したら電流
供給手段４が上記磁気抵抗効果型磁気ヘッド２に電流を
供給する。このため磁気ディスク１の回転により磁気抵
抗効果型磁気ヘット２は浮上すると共にその回転により
発生する空気流によって冷却されるので、無風下におい
て電流が供給されてジュール熱の発熱により溶断するこ
とはなくなる。尚、上記所定速度は定常回転速度以下で
あってもよい。(Means for Solving the Problems) Means for solving the above problems in the present invention are as shown in FIG. 1, a magnetic disk device that performs magnetic recording and reproduction of data using a magnetic disk 1. , a magnetoresistive magnetic disk 2 for reproducing data from the magnetic disk 1 using a supplied current and magnetic resistance; and a detection means 3 for detecting that the rotational speed of the magnetic disk 1 reaches a predetermined speed. and current supply means 4 for supplying current to the magnetoresistive magnetic head 2 when the detection means 3 detects that the rotational speed has reached a predetermined speed. Note that a magnetoresistive magnetic head does not refer to a magnetic head that uses a magnetoresistive element and obtains a reproducing voltage by the magnetoresistive effect.According to the present invention, the magnetoresistive magnetic head 2 can be used as a reproducing head. As a result, a higher reproduction output can be obtained than the wire-wound head used in ordinary magnetic disk drives. Further, the detection means 3 detects when the rotational speed of the magnetic disk 1 reaches a predetermined speed, for example, a steady rotational speed during data reproduction, and when the magnetic disk 1 reaches this speed, the current supply means 4 A current is supplied to the effective magnetic head 2. For this reason, the magnetoresistive magnetic head 2 floats due to the rotation of the magnetic disk 1 and is cooled by the air flow generated by the rotation, so that it will not be blown out due to Joule heat generation due to current being supplied under no wind. . Note that the predetermined speed may be less than or equal to the steady rotation speed.
（実施例）
以下本発明に係る磁気ディスク装置の実施例を図面に基
づいて説明する。(Example) An example of a magnetic disk device according to the present invention will be described below based on the drawings.
本実施例の磁気ディスク装置は第２図に示すように記録
媒体としての磁気ディスク２５上からデータを再生する
磁気抵抗効果型磁気ヘッド（以下、ＭＲヘッドという）
２１と、磁気ディスク２５を回転させる駆動機構２２と
、磁気ディスク２５の回転速度が所定の定常速度に達し
たことを検出する定常速度検出回路２３と、定常速度検
出回路２３の検出結果に応じてＭＲヘッド２１にセンス
電流を供給するセンス電流供給回路２４とを宥する。As shown in FIG. 2, the magnetic disk device of this embodiment is a magnetoresistive magnetic head (hereinafter referred to as MR head) that reproduces data from a magnetic disk 25 as a recording medium.
21, a drive mechanism 22 that rotates the magnetic disk 25, a steady speed detection circuit 23 that detects that the rotational speed of the magnetic disk 25 has reached a predetermined steady speed, and according to the detection result of the steady speed detection circuit 23. The sense current supply circuit 24 that supplies sense current to the MR head 21 is relieved.
同図において本実施例のＭＲヘッド２１は巻線型ヘッド
のコアとほぼ同形状でギャップが設けられた磁気抵抗効
果素子で構成され、磁気ディスク２５上に磁気記録され
たデータから受ける磁場の変化に応じて磁気抵抗が変化
する磁気抵抗効果を有するものである。そしてＭＲヘッ
ト２１は磁気ディスク２５上からデータを再生する場合
には磁気抵抗の変化と供給されるセンス電流とにより生
じる電圧を再生出力電圧とする。つまりセンス電流をｉ
、磁気抵抗の変化なΔＲとすれば、その再生出力電圧Δ
Ｖは、
Δｖ＝ｉｘΔＲ
となる。In the same figure, the MR head 21 of the present embodiment is composed of a magnetoresistive element that has almost the same shape as the core of the wire-wound head and has a gap, and is sensitive to changes in the magnetic field received from data magnetically recorded on the magnetic disk 25. It has a magnetoresistance effect in which the magnetoresistance changes accordingly. When the MR head 21 reproduces data from the magnetic disk 25, the voltage generated by the change in magnetic resistance and the supplied sense current is used as the reproduction output voltage. In other words, the sense current is i
, if ΔR is the change in magnetic resistance, then the reproduction output voltage Δ
V becomes Δv=ixΔR.
また同図において駆動機構２２は磁気ディスク２５を回
転させる駆動モータ２２ａと、駆動モータ２２ａの回転
数（回転速度）を検出するホール素子２２ｂとを有する
。Further, in the figure, the drive mechanism 22 includes a drive motor 22a that rotates the magnetic disk 25, and a Hall element 22b that detects the number of rotations (rotational speed) of the drive motor 22a.
さらに本実施例の定常速度検出回路２３はホール素子２
２ｂが求めた駆動モータ２２ａの回転数から磁気ディス
ク２５の回転速度を求めて、その回転速度が所定速度、
即ち本実施例の場合データ再生時の定常回転速度に達す
ることを検出し、後述のセンス電流供給回路２４に指令
を送るものである。そして本実施例のセンス電流供給回
路２４は定常速度検出回路２３から磁気ディスクの回転
速度が上記定常回転速度に達したという指令を受けてＭ
Ｒヘッド２１にセンス電流を供給するものである。Furthermore, the steady speed detection circuit 23 of this embodiment has a Hall element 2
The rotational speed of the magnetic disk 25 is determined from the rotational speed of the drive motor 22a determined by 2b, and the rotational speed is set to a predetermined speed,
That is, in the case of this embodiment, it is detected that the steady rotation speed during data reproduction is reached, and a command is sent to the sense current supply circuit 24, which will be described later. Then, the sense current supply circuit 24 of this embodiment receives a command from the steady speed detection circuit 23 that the rotational speed of the magnetic disk has reached the above-mentioned steady rotational speed.
It supplies a sense current to the R head 21.
次に本実施例の作用を説明する。Next, the operation of this embodiment will be explained.
まず、この磁気ディスク装置の電源が投入されると本装
置内の電源制御回路部（図示せず）等から駆動モータ２
２ａに駆動電流が供給される。すると駆動モータ２２ａ
は駆動して磁気ディスク２５を回転させる。その際、ホ
ール素子２２ｂが駆動モータ２２ａの回転数を検出し、
定常速度検出回路２３がこの回転数から磁気ディスク２
５の回転速度を検出する。First, when the power of this magnetic disk device is turned on, the drive motor 2 is
A drive current is supplied to 2a. Then, the drive motor 22a
is driven to rotate the magnetic disk 25. At that time, the Hall element 22b detects the rotation speed of the drive motor 22a,
The steady speed detection circuit 23 detects the magnetic disk 2 from this rotational speed.
Detect the rotation speed of 5.
そして定常速度検出回路２３は磁気ディスク２５の回転
速度が上記定常速度に達するとセンス電流供給回路２４
に指令を出し、ＭＲヘッド２１にセンス電流を供給させ
る。このためＭＲヘッド２１はセンス電流が供給されて
いる時は常に磁気ディスク２５の定常回転によって生じ
る空気流によって浮上すると共に冷却されるので、セン
ス電流によって発生するジュール熱による温度上昇が軽
減されて、無風下においてセンス電流が流れて溶断する
ようなことはなくなる。Then, when the rotation speed of the magnetic disk 25 reaches the above-mentioned steady speed, the steady speed detection circuit 23 sends the sense current supply circuit 24 to the sense current supply circuit 23.
A command is issued to supply the sense current to the MR head 21. Therefore, when the sense current is supplied to the MR head 21, the MR head 21 is always floated and cooled by the air flow generated by the steady rotation of the magnetic disk 25, so that the temperature rise due to Joule heat generated by the sense current is reduced. There is no possibility that the sense current will flow and cause a meltdown under no wind.
実験によるとＭＲヘッド２１は無風状態では６×１０６
Ａ／ｃｍ２の電流密度で溶断したが、磁気ディスクの定
常回転時の空気流により冷却されている状態にあっては
ａｘ １０６Ａ／ｃｍ２の無風状態の１．３倍以上の電
流密度でも溶断しないことがわかった。According to experiments, the MR head 21 has a power of 6 x 106 in windless conditions.
It melted at a current density of A/cm2, but when the magnetic disk is cooled by air flow during steady rotation, it does not melt even at a current density of 106 A/cm2 or more than 1.3 times that of a windless state. I understand.
そしてＭＲヘッド２１は溶断することなくセンス電流が
流れ、磁気ディスク２５上に磁気記録されたデータの磁
場の変化により抵抗が変り再生出力電圧を得ることがで
きる。A sense current flows through the MR head 21 without blowing out, and the resistance changes due to changes in the magnetic field of data magnetically recorded on the magnetic disk 25, making it possible to obtain a reproduction output voltage.
従って本実施例によれば、磁気ディスク装置の再生ヘッ
ドにＭＲヘッドを用い、磁気ディスク２５が予め定めた
所定回転速度に達した時に上記ＭＲヘッド２１にセンス
電流を供給するようにしたので、ＭＲヘッド２１はセン
ス電流が流れている時には常に空気流によって冷却され
、溶断することなく通常の巻線型ヘッドより高い再生出
力電圧を得ることができる。Therefore, according to this embodiment, an MR head is used as the reproducing head of the magnetic disk device, and a sense current is supplied to the MR head 21 when the magnetic disk 25 reaches a predetermined rotational speed. The head 21 is always cooled by the air flow when the sense current is flowing, and can obtain a higher reproduction output voltage than a normal wire-wound head without blowing out.
尚、上記実施例では磁気ディスク２５が予め定めた所定
の回転速度に達することをホール素子を用いて駆動モー
タの回転数から求めるようにしたが、本発明では他の方
法でも勿論よく、例えば磁気ディスクに切り欠き郁を設
けてそこに光を照射して周期を求めたり、磁気ディスク
が一回転する毎にパルスを発するようにしておいてその
パルス数により磁気ディスクの回転速度を直接検出する
ようにしてもよい。また本発明では駆動モータに駆動電
流を供給してからの経過時間により磁気ディスクの回転
速度を求めるようにしてもよい。In the above embodiment, reaching a predetermined rotational speed of the magnetic disk 25 is determined from the rotational speed of the drive motor using a Hall element, but the present invention may also use other methods. You can measure the period by making a notch in the disk and shining light into it, or you can make it emit a pulse every time the magnetic disk rotates and directly detect the rotational speed of the magnetic disk from the number of pulses. You may also do so. Further, in the present invention, the rotational speed of the magnetic disk may be determined based on the elapsed time after the drive current is supplied to the drive motor.
（発明の効果）
以上説明したように本発明によれば、磁気ディスク装置
の再生ヘッドに磁気抵抗効果型磁気ヘッドを用い、磁気
ディスクが予め定めた所定回転速度に達した時に上記磁
気抵抗効果型磁気ヘッドに電流を供給するようにしたの
で、磁気抵抗効果型磁気ヘッドは磁気ディスクの回転に
よる発生する空気流により冷却され、溶断することなく
通常の巻線型ヘッドより高い再生出力電圧を得ることが
できる。(Effects of the Invention) As explained above, according to the present invention, a magnetoresistive magnetic head is used as a reproducing head of a magnetic disk device, and when the magnetic disk reaches a predetermined rotational speed, Since current is supplied to the magnetic head, the magnetoresistive magnetic head is cooled by the air flow generated by the rotation of the magnetic disk, and can obtain a higher reproduction output voltage than a normal wire-wound head without blowing out. can.
第１図は本発明の原理図、第２図本発明に係る磁気ディ
スク装置の実施例を示す図、第３図は従来の磁気ディス
ク装置の巻線型ヘッドを示す図である。
１．２５・・・磁気ディスク
２．２１・・・磁気抵抗効果型磁気ヘラ（ＭＲヘッド）
３．２３・・・検出手段
（定常速度検出回路）
４．２４・・・電流供給手段
（センス電流供給手段）
ドFIG. 1 is a diagram showing the principle of the present invention, FIG. 2 is a diagram showing an embodiment of a magnetic disk device according to the present invention, and FIG. 3 is a diagram showing a wire-wound head of a conventional magnetic disk device. 1.25... Magnetic disk 2.21... Magnetoresistive magnetic spatula (MR head) 3.23... Detection means (steady speed detection circuit) 4.24... Current supply means (sense current supply means)
Claims (1)
を行なう磁気ディスク装置において、供給される電流と
磁気抵抗とにより上記磁気ディスク（１）からデータを
再生する磁気抵抗効果型磁気ヘッド（２）と、 上記磁気ディスク（１）の回転速度が所定速度に達する
ことを検出する検出手段（３）と、検出手段（３）で上
記回転速度が所定速度に達したことが検出された時に上
記磁気抵抗効果型磁気ヘッド（２）に電流を供給する電
流供給手段（４）とを設けたことを特徴とする磁気ディ
スク装置。[Claims] In a magnetic disk device that magnetically records and reproduces data using a magnetic disk (1), a magnetoresistance effect that reproduces data from the magnetic disk (1) using a supplied current and magnetic resistance. a magnetic head (2), a detection means (3) for detecting that the rotational speed of the magnetic disk (1) reaches a predetermined speed, and a detection means (3) for detecting that the rotational speed of the magnetic disk (1) reaches a predetermined speed. A magnetic disk drive characterized by comprising: current supply means (4) for supplying current to the magnetoresistive magnetic head (2) when detected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2058055A JP2907925B2 (en) | 1990-03-12 | 1990-03-12 | Disk unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2058055A JP2907925B2 (en) | 1990-03-12 | 1990-03-12 | Disk unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03260902A true JPH03260902A (en) | 1991-11-20 |
| JP2907925B2 JP2907925B2 (en) | 1999-06-21 |
Family
ID=13073228
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2058055A Expired - Fee Related JP2907925B2 (en) | 1990-03-12 | 1990-03-12 | Disk unit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2907925B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06259739A (en) * | 1993-02-18 | 1994-09-16 | Internatl Business Mach Corp <Ibm> | Contact magnetic recording disc-file with reluctance reading sensor |
| US5831782A (en) * | 1994-01-27 | 1998-11-03 | Fujitsu Limited | Method and apparatus for supplying optimal bias current to a magnetic head |
| US5978163A (en) * | 1996-09-23 | 1999-11-02 | International Business Machines Corporation | Circuit and method for optimizing bias supply in a magnetoresistive head based on temperature |
| US5993982A (en) * | 1997-03-18 | 1999-11-30 | Fujitsu Limited | Method and apparatus for evaluating durability of magnetic disk |
-
1990
- 1990-03-12 JP JP2058055A patent/JP2907925B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06259739A (en) * | 1993-02-18 | 1994-09-16 | Internatl Business Mach Corp <Ibm> | Contact magnetic recording disc-file with reluctance reading sensor |
| US5831782A (en) * | 1994-01-27 | 1998-11-03 | Fujitsu Limited | Method and apparatus for supplying optimal bias current to a magnetic head |
| US5978163A (en) * | 1996-09-23 | 1999-11-02 | International Business Machines Corporation | Circuit and method for optimizing bias supply in a magnetoresistive head based on temperature |
| US5993982A (en) * | 1997-03-18 | 1999-11-30 | Fujitsu Limited | Method and apparatus for evaluating durability of magnetic disk |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2907925B2 (en) | 1999-06-21 |
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| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |