JPH04111264A - Actuator for magnetic disk device - Google Patents

Actuator for magnetic disk device

Info

Publication number
JPH04111264A
JPH04111264A JP22801290A JP22801290A JPH04111264A JP H04111264 A JPH04111264 A JP H04111264A JP 22801290 A JP22801290 A JP 22801290A JP 22801290 A JP22801290 A JP 22801290A JP H04111264 A JPH04111264 A JP H04111264A
Authority
JP
Japan
Prior art keywords
yoke
screw
fixing
torque
laminated
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
Application number
JP22801290A
Other languages
Japanese (ja)
Inventor
Kyoichi Otsuka
恭一 大塚
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP22801290A priority Critical patent/JPH04111264A/en
Priority to DE19914128765 priority patent/DE4128765A1/en
Priority to GB9118614A priority patent/GB2247557B/en
Publication of JPH04111264A publication Critical patent/JPH04111264A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
    • G11B5/54—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head into or out of its operative position or across tracks
    • G11B5/55—Track change, selection or acquisition by displacement of the head
    • G11B5/5521—Track change, selection or acquisition by displacement of the head across disk tracks

Abstract

PURPOSE:To prevent the positioning accuracy of a head being lowered without inclining the shaft of a movable part by fixing the laminating part of a yoke by tightening with a screw via an auxiliary part connected to a base. CONSTITUTION:Torque applied when a yoke fixing screw 16 is tightened is transmitted from the bearing surface of the yoke fixing screw 16 to a yoke fixing auxiliary plate 14, however, since the yoke fixing auxiliary plate 14 is fixed with a yoke fixing auxiliary plate mounting screw 15, the torque is not transmitted to the laminating part of the yoke 1, and only the axial tension of the screw is applied to the laminating part of the yoke 1, which prevents torsion from remaining in the yoke 1. Also, since no torque is transmitted to the laminating part of the yoke 1 even when the residual torsion of the screw is released by the effect of temperature fluctuation or secular change, no deviation of the laminating part of the yoke 1 occurs. In such a way, it is possible to prevent the deviation of the laminating part of the yoke which makes worse the positioning accuracy of the head occurring by the effect of temperature fluctuation and secular change, and to accurately read information.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 この発明は、磁気ディスク装置のヘッド位置決め機構等
に適用されるアクチュエータの構造に関するものである
。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to the structure of an actuator applied to a head positioning mechanism of a magnetic disk drive.

〔従来の技術〕[Conventional technology]

第５図は、例えば特開昭６２−７７０４８号公報に示さ
れた従来の磁気ディスクのアクチュエータを示す分解斜
視図であり、図において（１）は軸受（１１）をそれぞ
れ有する上部ヨーク（２）および下部ヨーク（３）　と
、この上部ヨーク（２）　と下部ヨーク（３）とに介在
されたエンドヨーク（４）とからなり、上部ヨーク（２
）、エンドヨーク（４）および下部ヨーク（３）の積層
部を貫通ねじによって固定する積層構造のヨーク、（５
）は上部ヨーク（２）　と下部ヨーク（３）とにそれぞ
れ設けられ、磁気回路を形成する永久磁石、（６）はヘ
ッド（図示せず）を取り付けるアーム（７）、可動部フ
レーム（９）およびコイル（１０）からなる可動部、（
８）は軸であるピボット軸で、このピボット軸（８）は
その両端を上部ヨーク（２）と下部ヨーク（３）とにそ
れぞれ設けられた軸受（１１）に軸受けされている。FIG. 5 is an exploded perspective view showing a conventional magnetic disk actuator disclosed in, for example, Japanese Unexamined Patent Publication No. 62-77048. In the figure, (1) shows an upper yoke (2) each having a bearing (11). It consists of a lower yoke (3), an end yoke (4) interposed between the upper yoke (2) and the lower yoke (3), and an upper yoke (2).
), a yoke with a laminated structure in which the laminated parts of the end yoke (4) and the lower yoke (3) are fixed by penetrating screws, (5
) are provided on the upper yoke (2) and the lower yoke (3), respectively, and are permanent magnets forming a magnetic circuit, (6) are the arm (7) to which the head (not shown) is attached, and the movable part frame (9). and a movable part consisting of a coil (10), (
8) is a pivot shaft, and both ends of the pivot shaft (8) are supported by bearings (11) provided in the upper yoke (2) and the lower yoke (3), respectively.

従来の磁気ディスクのアクチュエータは上記のように構
成され、永久磁石（５）による磁界とコイル（１０）を
流れる電流とから発生する電磁気力によってピボット軸
（８）を中心に可動部（６）が揺動し、アーム（７）に
取り付けたヘッドが移動する。ヘッドの少なくともひと
つが磁気ディスクがらサーボ情報を読む機能を有するサ
ーボヘッドであり、他のヘッドは磁気ディスクに対して
データを読み書きするデータヘッドとなっており、この
サーボヘッドで位置決めすると、これに連動してデータ
ヘッドが位置決めされる。The conventional magnetic disk actuator is configured as described above, and the movable part (6) is moved around the pivot axis (8) by electromagnetic force generated from the magnetic field by the permanent magnet (5) and the current flowing through the coil (10). It swings and the head attached to the arm (7) moves. At least one of the heads is a servo head that has the function of reading servo information from the magnetic disk, and the other heads are data heads that read and write data from the magnetic disk. The data head is positioned.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

上記のような従来の磁気ディスク装置のアクチュエータ
では、上部ヨーク（２）、エンドヨーク（４）および下
部ヨーク（３）からなる積層構造のヨーク（１）が貫通
ねしによって固定されているから、ねじを締め付けたと
きに働くトルクでねじとヨーク（１）とに捩れが残留し
、温度変動や経年効果によって、このねじとヨーク（１
）との残留捩れが解放されて、ヨーク（１）のピボット
軸（８）の両端を支える部分に相対的なずれが生じ、こ
のとき、ピボット軸（８）とともに可動部（６）が傾き
、サーボヘッドに対してデータヘッドの相対位置がずれ
て正しく情報をよむことができなくなるという問題点が
あった。In the conventional actuator for a magnetic disk drive as described above, the yoke (1), which has a laminated structure consisting of an upper yoke (2), an end yoke (4), and a lower yoke (3), is fixed by a through screw. The torque that acts when the screw is tightened leaves a twist in the screw and yoke (1), and due to temperature fluctuations and aging effects, this screw and yoke (1)
) is released, and a relative shift occurs in the portion of the yoke (1) that supports both ends of the pivot shaft (8), and at this time, the movable part (6) tilts together with the pivot shaft (8). There was a problem in that the relative position of the data head with respect to the servo head shifted, making it impossible to read information correctly.

この発明は、ががる問題点を解決するなめになされたも
ので、温度変動や経年効果によって、ヘッドの位置決め
精度を悪化させるヨーク（１）の積層部のずれが発生し
ない磁気ディスク装置のアクチュエータを得ることを目
的とする。This invention was made to solve the problem of looseness, and provides an actuator for magnetic disk drives that does not cause misalignment of the laminated portion of the yoke (1), which deteriorates head positioning accuracy due to temperature fluctuations or aging effects. The purpose is to obtain.

〔課題を解決するための手段〕[Means to solve the problem]

この発明に係る磁気ディスク装置のアクチュエータは、
ベースに連設された補助部を介して積層部をねじを用い
てねじ締めして固定したものである。The actuator of the magnetic disk device according to the present invention includes:
The laminated part is fixed by tightening screws through an auxiliary part connected to the base.

〔作　用〕[For production]

この発明においては、ヨークの積層部の固定の際、ねじ
締めっけ時のトルクがねじの座面がら補助部に伝わるが
、補助部がベースに固定されているのでヨークの積層部
まで伝わらず、ねじの軸力のみがヨークのｉｉ部に作用
し、ヨークに捩れが残留することがない。In this invention, when the laminated part of the yoke is fixed, the torque when tightening the screw is transmitted from the seat surface of the screw to the auxiliary part, but since the auxiliary part is fixed to the base, it is not transmitted to the laminated part of the yoke. , only the axial force of the screw acts on the ii portion of the yoke, and no twist remains in the yoke.

〔実施例〕〔Example〕

第１図はこの発明の一実施例を示す平面図、第２図は第
１図の■−■線に沿う断面図であり、第５図に示す従来
の磁気ディスク装置のアクチュエータと同一または相当
部分は同一符号を付し、その説明を省略する。FIG. 1 is a plan view showing an embodiment of the present invention, and FIG. 2 is a sectional view taken along the line ■-■ in FIG. The parts are given the same reference numerals and their explanations are omitted.

図において（１２）はコイル（１０）を貫通するセンタ
ーボール、（１３）はベース、（１４）はベース（１３
）にヨーク固定補助板取付ねじ（１５）でその一端を固
定され、ベース（１３）との間に上部ヨーク（２）、エ
ンドヨーク（４）および下部ヨーク（３）からなるヨー
ク（１）の積層部を挟み込むように配置された補助部と
してのヨーク固定補助板、（１６）はヨーク（１）の積
層部を貫通させて、ベース（１３）とヨーク固定補助板
（１４）とのねじ締めによりヨークの積層部を固定する
ヨーク固定ねじである。In the figure, (12) is the center ball that passes through the coil (10), (13) is the base, and (14) is the base (13).
) with the yoke fixing auxiliary plate mounting screw (15), and the yoke (1) consisting of the upper yoke (2), end yoke (4) and lower yoke (3) is fixed between it and the base (13). The yoke fixing auxiliary plate (16) serves as an auxiliary part arranged to sandwich the laminated part, and the yoke fixing auxiliary plate (16) passes through the laminated part of the yoke (1) and tightens the screws between the base (13) and the yoke fixing auxiliary plate (14). This is a yoke fixing screw that fixes the laminated part of the yoke.

上記のように構成された磁気ディスク装置のアクチュエ
ータにおいては、ヨーク固定ねじ（１６）のねじ締めつ
け時のトルクがヨーク固定ねじ（１６）の座面からヨー
ク固定補助板（１４）に伝達されるが、ヨーク固定補助
板（１４）がベース（１３）にヨーク固定補助板取付ね
じ（１５）で固定されているため、このトルクがヨーク
（１）の積層部まで伝達されず、ねじの軸力のみヨーク
（１）の積層部に作用し、ヨーク（１）に捩れが残留す
ることがない。In the actuator of the magnetic disk drive configured as described above, the torque when tightening the yoke fixing screw (16) is transmitted from the seat surface of the yoke fixing screw (16) to the yoke fixing auxiliary plate (14). Since the yoke fixing auxiliary plate (14) is fixed to the base (13) with the yoke fixing auxiliary plate mounting screw (15), this torque is not transmitted to the laminated part of the yoke (1), and only the axial force of the screw is applied. This acts on the laminated portion of the yoke (1), and no twist remains in the yoke (1).

また、温度変動や経年効果によってねじの残留捩れが解
放されてもこのトルクがヨーク（１）の積層部まで伝わ
らないので、ヨーク（１）の積層部のずれが発生しない
。Further, even if the residual twist of the screw is released due to temperature fluctuations or aging effects, this torque is not transmitted to the laminated portion of the yoke (1), so that the laminated portion of the yoke (1) does not shift.

第３図はこの発明の他の実施例を示す側断面図であり、
（１７）はベース（１３）に固定され、ベース（１３）
との間に上部ヨーク（２）、エンドヨーク（４）および
下部ヨーク（３〉からなるヨーク（１）の積層部を挟み
込むように配置された補助部としてのトップカバーであ
り、ヨーク（１）の積層部を貫通させて、ベース（１３
）とトップカバー（１７）とをヨーク固定ねじ（１６）
でねじ締めしてヨーク（１）の積層部を固定している。FIG. 3 is a side sectional view showing another embodiment of the invention,
(17) is fixed to the base (13), and the base (13)
It is a top cover as an auxiliary part arranged to sandwich the laminated part of the yoke (1) consisting of the upper yoke (2), the end yoke (4) and the lower yoke (3) between the yoke (1) and the yoke (1). The base (13
) and top cover (17) with the yoke fixing screw (16).
The stacked part of the yoke (1) is fixed by tightening the screws.

上記のように構成された磁力ディスク装置のアクチュエ
ータにおいては、ヨーク固定ねしく１６）のねじ締めつ
け時のトルクがヨーク固定ねじ（１６）の座面からトッ
プカバー（１７）に伝達されるが、トップ力バーク１７
）がベース（１３）に固定されているため、このトルク
がヨーク（１）の積層部まで伝達されず、ねじの軸力の
みヨーク（１）の積層部に作用し、ヨーク（１）に捩れ
が残留することがない、また、温度変動や経年効果によ
ってヨーク固定ねしく１６）の残留捩れが解放されても
このトルクがヨーク（１）の１１１部まで伝わらないの
で、ヨーク（１）の積層部のずれが発生しない。In the actuator of the magnetic disk device configured as described above, the torque when tightening the screw of the yoke fixing screw (16) is transmitted from the seat surface of the yoke fixing screw (16) to the top cover (17). power bark 17
) is fixed to the base (13), this torque is not transmitted to the laminated part of the yoke (1), and only the axial force of the screw acts on the laminated part of the yoke (1), causing the yoke (1) to twist. Also, even if the residual twist in the yoke fixing screw 16) is released due to temperature fluctuations or aging effects, this torque will not be transmitted to the 111 part of the yoke (1), so the lamination of the yoke (1) No misalignment of parts occurs.

第４図はこの発明にさらに他の実施例を示す側断面図で
あり、（１８）は第２図、第３図の実施例のベース（１
３）でもある下部ヨーク（３）と一体で形成され、上部
ヨーク（２）、エンドヨーク（４）および下部ヨーク（
３）からなるヨーク（１）の積層部を挟み込むように配
置された補助部で、ヨーク（１）の積層部を貫通させて
下部ヨーク（３）と補助部（１８）とをヨーク固定ねし
く１６）でねじ締めしてヨーク（１）の積層部を固定し
ている。FIG. 4 is a side sectional view showing still another embodiment of the present invention, and (18) is a base (18) of the embodiment of FIGS. 2 and 3.
It is formed integrally with the lower yoke (3), which is also the upper yoke (2), the end yoke (4) and the lower yoke (
The auxiliary part is arranged to sandwich the laminated part of the yoke (1) consisting of 3), and the auxiliary part is fixed to the lower yoke (3) and the auxiliary part (18) by penetrating the laminated part of the yoke (1). 16) is tightened with screws to fix the laminated portion of the yoke (1).

上記のように構成された磁気ディスク装置のアクチュエ
ータにおいては、ヨーク固定ねじ（１６）のねじ締めつ
け時のトルクがヨーク固定ねしく１６）の座面から補助
部（１８）に伝達されるが、補助部〈１８）が下部ヨー
ク（３）と一体に形成されているため、このトルクがヨ
ーク（１）の積層部まで伝達されず、ねじの軸力のみヨ
ーク（１）の積層部に作用し、ヨーク（１）に捩れが残
留することはない、また、温度変動や経年効果によって
ヨーク固定ねじ（１６）の残留ねじれが解放されてもこ
のトルクがヨーク（１）の積層部まで伝わらないので、
ヨーク（１）の積層部のずれが発生しない。In the actuator of the magnetic disk drive configured as described above, the torque when tightening the yoke fixing screw (16) is transmitted from the seat surface of the yoke fixing screw 16) to the auxiliary part (18). Since the portion (18) is formed integrally with the lower yoke (3), this torque is not transmitted to the laminated portion of the yoke (1), and only the axial force of the screw acts on the laminated portion of the yoke (1). There is no residual twist in the yoke (1), and even if the residual twist in the yoke fixing screw (16) is released due to temperature fluctuations or aging effects, this torque will not be transmitted to the laminated portion of the yoke (1).
Misalignment of the laminated portion of the yoke (1) does not occur.

なお、上記実施例ではセンターボール（１２）を有する
タイプのヨーク（１）であるが、第５図に示されたよう
に従来の磁気ディスク装置のアクチュエータのようにコ
イル（１０）が偏平でセンターボール（１２〉を有した
タイプのヨークについても、積層構造をとり、かつ、軸
の両端を軸受けするヨークであれば上記実施例と同様の
効果を得ることができる。In the above embodiment, the yoke (1) is of a type having a center ball (12), but as shown in FIG. As for the type of yoke having balls (12), the same effects as in the above embodiment can be obtained as long as the yoke has a laminated structure and supports both ends of the shaft.

また、上記各実施例ではヨーク固定ねじ（１６）の数量
が２本である場合について述べたが、ねじの取付構造が
同様であれば何本であってもよい。Further, in each of the above embodiments, a case has been described in which the number of yoke fixing screws (16) is two, but any number may be used as long as the screw mounting structure is the same.

さらに、第１図ないし第３図に示した各実施例ではベー
ス（１３）に、第４図に示した実施例ではベースを兼ね
た下部ヨーク（３）に、ヨーク固定ねじ（１６）のため
のねじ穴が加工されているが、ねじ穴を加工するかわり
に、ナツトあるいはねし穴を加工した部材をベース（１
３）あるいは下部ヨーク（３）の下に配置してヨーク（
１）の積層部を固定してもよい。Furthermore, a yoke fixing screw (16) is provided on the base (13) in each of the embodiments shown in FIGS. 1 to 3, and on the lower yoke (3) which also serves as the base in the embodiment shown in FIG. A screw hole is machined, but instead of machined a screw hole, a nut or a member with a tapped hole machined is used as a base (1
3) Or place it under the lower yoke (3) and attach the yoke (
The laminated portion of 1) may be fixed.

さらにまた、上記各実施例ではヨーク固定ねじ（１６）
が上から下の方向にヨーク（１）の積層部を貫通して取
り付けられているが、ヨーク固定ねじ（１６）は下から
上の方向でもよい。Furthermore, in each of the above embodiments, the yoke fixing screw (16)
Although the yoke fixing screw (16) is attached from the top to the bottom through the laminated portion of the yoke (1), the yoke fixing screw (16) may be installed from the bottom to the top.

〔発明の効果〕〔Effect of the invention〕

この発明は以上説明したとおり、ベースに連設された補
助部を介してヨークの１１１７１部をねじを用いてねじ
締めして固定したので、ねじ締めによるトルクがヨーク
の積層部に作用せず、また、温度変動や経年効果によっ
てねじの残留捩れが解放されてもこのトルクがヨークの
積層部に作用せず、ヨークの積層部のずれも発生するこ
とはなくヘッドが取り付けられている可動部の軸が傾く
ことがないので、ヘッドの位置決め精度の悪化を防止す
ることにより、正しく情報を読むことができる磁気ディ
スク装置のアクチュエータが得られる効果がある。As explained above, in this invention, the 11171 part of the yoke is fixed by tightening the screws through the auxiliary part connected to the base, so that the torque due to screw tightening does not act on the laminated part of the yoke. In addition, even if residual twist in the screw is released due to temperature fluctuations or aging effects, this torque will not act on the laminated portion of the yoke, and the laminated portion of the yoke will not shift. Since the axis does not tilt, deterioration in head positioning accuracy is prevented, thereby providing an actuator for a magnetic disk device that can read information correctly.

【図面の簡単な説明】[Brief explanation of drawings]

第１図はこの発明の一実施例を示す要部平面図、および
第２図は第１図の■−■線に沿う断面図、第３図および
第４図はそれぞれこの発明の実施態様を示す側断面図、
第５図は従来の磁気ディスク装置のアクチュエータを示
す分解斜視図である。 図において、（１）はヨーク、（２）は上部ヨーク、（
３）は下部ヨーク、（４）はエンドヨーク、（５）は永
久磁石、（６）は可動部、（８）はピボット軸、（１３
）はベース、（１４）はヨーク固定補助板、（１６）は
ヨーク固定補助板取付ねじ、（１７）はトップ力バ−（
１８）は補助板、補助部である。 なお、各図中同一符号は同一またＣま相当部分を示す。FIG. 1 is a plan view of essential parts showing an embodiment of the present invention, FIG. 2 is a sectional view taken along the line ■-■ in FIG. 1, and FIGS. 3 and 4 each illustrate an embodiment of the invention. A side sectional view showing,
FIG. 5 is an exploded perspective view showing an actuator of a conventional magnetic disk device. In the figure, (1) is the yoke, (2) is the upper yoke, (
3) is the lower yoke, (4) is the end yoke, (5) is the permanent magnet, (6) is the movable part, (8) is the pivot shaft, (13) is the
) is the base, (14) is the yoke fixing auxiliary plate, (16) is the yoke fixing auxiliary plate mounting screw, (17) is the top force bar (
18) is an auxiliary plate or auxiliary part. Note that the same reference numerals in each figure indicate the same parts or parts corresponding to C.

Claims (1)

【特許請求の範囲】 上部ヨーク、下部ヨークおよび上部ヨークと下部ヨーク
との間に挟持されたエンドヨークとからなるヨークと、 このヨークを貫通した軸と、 この軸に回転自在に設けられているとともにヘッドが搭
載された可動部と、 前記上部ヨーク、前記下部ヨークおよび前記エンドヨー
クが積層されてなる積層部を貫通して前記ヨークを固定
するねじと、 を備えた磁気ディスク装置のアクチュエータにおいて、 前記ねじはベースに連設された補助部を介して前記積層
部をねじ締めして固定したことを特徴とする磁気ディス
ク装置のアクチュエータ。[Claims] A yoke consisting of an upper yoke, a lower yoke, and an end yoke held between the upper yoke and the lower yoke; a shaft passing through the yoke; and a shaft rotatably provided on the shaft. an actuator for a magnetic disk device, comprising: a movable part on which a head is mounted; and a screw that passes through a laminated part in which the upper yoke, the lower yoke, and the end yoke are laminated to fix the yoke. An actuator for a magnetic disk device, wherein the screw is fixed by tightening the laminated portion through an auxiliary portion connected to the base.
JP22801290A 1990-08-31 1990-08-31 Actuator for magnetic disk device Pending JPH04111264A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP22801290A JPH04111264A (en) 1990-08-31 1990-08-31 Actuator for magnetic disk device
DE19914128765 DE4128765A1 (en) 1990-08-31 1991-08-29 OPERATING DEVICE FOR A MAGNETIC DISK DEVICE
GB9118614A GB2247557B (en) 1990-08-31 1991-08-30 Actuator for magnetic disc apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP22801290A JPH04111264A (en) 1990-08-31 1990-08-31 Actuator for magnetic disk device

Publications (1)

Publication Number Publication Date
JPH04111264A true JPH04111264A (en) 1992-04-13

Family

ID=16869800

Family Applications (1)

Application Number Title Priority Date Filing Date
JP22801290A Pending JPH04111264A (en) 1990-08-31 1990-08-31 Actuator for magnetic disk device

Country Status (3)

Country Link
JP (1) JPH04111264A (en)
DE (1) DE4128765A1 (en)
GB (1) GB2247557B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6819020B2 (en) 2000-11-06 2004-11-16 Matsushita Electric Industrial Co., Ltd. Compact electric motor
US6912105B1 (en) 1997-07-07 2005-06-28 Hitachi Global Storage Technologies, Netherlands B.V. Magnetic disk device with firmly fixed yokes

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6912105B1 (en) 1997-07-07 2005-06-28 Hitachi Global Storage Technologies, Netherlands B.V. Magnetic disk device with firmly fixed yokes
US6819020B2 (en) 2000-11-06 2004-11-16 Matsushita Electric Industrial Co., Ltd. Compact electric motor

Also Published As

Publication number Publication date
GB2247557B (en) 1994-04-27
GB2247557A (en) 1992-03-04
GB9118614D0 (en) 1991-10-16
DE4128765A1 (en) 1992-03-05

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