JPH04162271A - Supporting device of levitated magnetic head - Google Patents
Supporting device of levitated magnetic headInfo
- Publication number
- JPH04162271A JPH04162271A JP28786690A JP28786690A JPH04162271A JP H04162271 A JPH04162271 A JP H04162271A JP 28786690 A JP28786690 A JP 28786690A JP 28786690 A JP28786690 A JP 28786690A JP H04162271 A JPH04162271 A JP H04162271A
- Authority
- JP
- Japan
- Prior art keywords
- flexure
- magnetic head
- load beam
- rigidity
- torsion mode
- 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
- 230000003014 reinforcing effect Effects 0.000 claims description 8
- 238000007667 floating Methods 0.000 claims description 7
- 239000000725 suspension Substances 0.000 abstract description 8
- 238000000034 method Methods 0.000 abstract description 3
- 230000002787 reinforcement Effects 0.000 abstract description 3
- 238000005452 bending Methods 0.000 description 5
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 239000013013 elastic material Substances 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
Landscapes
- Supporting Of Heads In Record-Carrier Devices (AREA)
Abstract
Description
本発明は、磁気ディスク装置に用いられる浮上式磁気ヘ
ッドの支持装置に係り、詳しくは、ロードビームと磁気
ヘッドとを結合する改良されたフレキシャーを備えた浮
上式磁気ヘッドの支持装置に関する。The present invention relates to a floating magnetic head support device used in a magnetic disk drive, and more particularly to a floating magnetic head support device equipped with an improved flexure for coupling a load beam and a magnetic head.
浮上式磁気ヘッドの支持装置においては、従来より、片
持ちばりの平板状支持体を用いたものが多く使用されて
いる。第４図に示すように、支持装置２０は、磁気ヘッ
ド２９を平板状のロードビーム２１の自由端に取り付け
、他端には取付マウント２５を配置した構造となってい
る。
ロードビーム２１は、ステンレス等の弾性材料からなり
、取付マウント２５側を底辺とする略二等辺三角形をな
しており、各斜辺に相当する部分には曲げ加工２２ａ、
２２ｂが施されている。これは、取付マウント２５に近
い部分には、塑性加工による曲げ加工が施してあり、弾
力性を持たせるかたわら、ロードビームの本体部分は曲
げ加工２２ａ、２２ｂにより剛性を高めている。
また、磁気コイル２９ａの巻回された磁気コア２９ｂと
スライダ２３からなる磁気ヘッド２９をロードビーム２
１に結合するのに、第５図に示す、弾性部材からなるフ
レキシャー２４を用い、その結合部分にも弾力性を与え
ていた。
二のフレキンヤ−２４は、方形の平板部２４１の一方の
短辺２４２ｂ側にロードビーム取付面２４５を一体に展
延して設けた形状で、平板部２４１の略中央から他方の
短辺２４４ａ側にかけて、略Ｕ字状の打抜き部になる磁
気ヘッド２９の吊持部２４７を設け、ここで磁気ヘッド
を弾力的に吊持していた。
このような部材になる支持装置２０は、取付マウント２
５を介して磁気ディスク装置のヘットアームに接続され
るが、上記構造により磁気媒体の揺動等に追従させよう
とするものであった。2. Description of the Related Art Conventionally, many support devices for floating magnetic heads employ a cantilevered flat support. As shown in FIG. 4, the support device 20 has a structure in which a magnetic head 29 is attached to the free end of a flat load beam 21, and a mounting mount 25 is arranged at the other end. The load beam 21 is made of an elastic material such as stainless steel, and has a substantially isosceles triangular shape with the base facing the mounting mount 25. The portions corresponding to the hypotenuses are bent 22a,
22b is applied. This is because the portion close to the mounting mount 25 is bent by plastic working to provide elasticity, while the main body portion of the load beam is bent by bending 22a and 22b to increase rigidity. A magnetic head 29 consisting of a magnetic core 29b around which a magnetic coil 29a is wound and a slider 23 is attached to the load beam 2.
1, a flexure 24 made of an elastic member shown in FIG. 5 was used to impart elasticity to the connecting portion. The second flexible ring 24 has a shape in which a load beam mounting surface 245 is integrally provided on one short side 242b side of a rectangular flat plate part 241, and extends from approximately the center of the flat plate part 241 to the other short side 244a side. A suspension portion 247 for the magnetic head 29, which is a substantially U-shaped punched portion, is provided over the magnetic head, and the magnetic head is elastically suspended here. The support device 20 that becomes such a member is a mounting mount 2.
The head arm of the magnetic disk drive is connected to the head arm of the magnetic disk device through the head arm 5, and the above structure is intended to follow the swinging motion of the magnetic medium.
磁気ディスク装置の高速化に伴い、殊に高速シーク時に
おいては、外部振動と磁気ヘットのシータ方向への振れ
により、磁気ヘッドの支持装置にねじり振動が発生する
ことがある。
これは、支持装置を構成する各部材の固有振動数が上記
振動数に含まれる場合、支持装置で共振をおこすもので
、磁気ヘッドを理想的な状態に維持することが難しくな
り、ときには、サーホ系の乱調からノークエラーを来す
こともある。支持装置で特に問題となるのは、１次、お
よび、２次モードのねしり振動で、このねじり振動の一
つは、ロートビームの本体部分に発生するものであり、
また一つは、磁気ヘッドとロードビームとの間に介在す
るフレキシャーに発生するものである。
このうち、ロートビームについては、前述の曲げ加工等
により剛性を高めて、ロードビームの固有のねじり振動
についてそのピーク周波数を高くして、共振を防止する
ことが計られていた。一方、ロードビームと磁気ヘッド
とを結合するフレキンヤーについては、１次、２次モー
ドの応力集中か起こる反面、十分な解決手段が講じられ
ていなかった。
本発明では、磁気ヘッドを弾力的に吊持したうえで、ね
じり振動による共振を抑制し得る改良された磁気ヘッド
のフレキジャ〜を備えた浮上式磁気ヘッドの支持装置を
提供することを目的としている。As magnetic disk drives become faster, torsional vibrations may occur in the magnetic head support device due to external vibrations and deflection of the magnetic head in the theta direction, especially during high-speed seeking. This is because if the natural frequency of each member that makes up the support device is included in the above frequency, resonance will occur in the support device, making it difficult to maintain the magnetic head in an ideal state, and sometimes causing Nok errors may also occur due to system disturbances. A particular problem with support devices is the primary and secondary modes of torsional vibration, one of which occurs in the main body of the funnel beam.
Another problem occurs in the flexure interposed between the magnetic head and the load beam. Among these, attempts have been made to increase the rigidity of the load beam by the above-mentioned bending process, etc., and to increase the peak frequency of the inherent torsional vibration of the load beam to prevent resonance. On the other hand, with respect to the flexible layer that connects the load beam and the magnetic head, stress concentration in the first and second modes occurs, but no sufficient solution has been taken. SUMMARY OF THE INVENTION An object of the present invention is to provide a floating magnetic head support device that is equipped with an improved magnetic head flexure that can elastically suspend the magnetic head and suppress resonance due to torsional vibration. .
上記課題を解決するために、本発明においては、記録媒
体上を浮上して情報を記録あるいは再生する磁気ヘッド
を保持するフレキシャーと、該フレキシャーを長手方向
の一端に取り付け、他端には取付マウントを具備してな
るロードビームとから構成する浮上式磁気ヘッドの支持
装置において、上記フレキシャーのロードビーム長手方
向に沿う両側縁部にフレキンヤー補強部材を設けること
を特徴とする。In order to solve the above problems, the present invention includes a flexure that holds a magnetic head that flies above a recording medium to record or reproduce information, and a flexure that is attached to one end in the longitudinal direction and a mounting mount to the other end. A floating magnetic head support device comprising a load beam and a load beam is characterized in that flexure reinforcing members are provided on both side edges of the flexure along the longitudinal direction of the load beam.
このような構成のフレキンヤーは、ロードビームの自由
端の下面に固着され、吊持部の略Ｕ字部分の下面に磁気
ヘッドのスライダが吊持される。
そして、ロードビームと磁気ヘッドとは、フレキンヤー
がバネ体として緩衝的に介在して結合される。このとき
、ロードビームの長手方向に沿うフレキシャーの両側縁
部に一体に取り付けられた補強部材は、平板部の剛性を
高めてねじり振動に対するフレキンヤーの固有振動のピ
ーク周波数を上げることとなり、磁気ヘッド、フレキシ
ャー、および、ロードビームの一体となった支持装置系
における１次、２次のねじりモードの共振を回避する。The flexible cable having such a structure is fixed to the lower surface of the free end of the load beam, and the slider of the magnetic head is suspended from the lower surface of the approximately U-shaped portion of the suspension portion. The load beam and the magnetic head are coupled to each other with a flexible cushion interposed as a spring body. At this time, the reinforcing members that are integrally attached to both side edges of the flexure along the longitudinal direction of the load beam increase the rigidity of the flat plate part and increase the peak frequency of the natural vibration of the flexure against torsional vibration. To avoid resonance of primary and secondary torsional modes in a supporting device system in which a flexure and a load beam are integrated.
本発明の実施例を第１図ないし第３図を参照して説明す
る。
支持装置ｌＯは、磁気ヘッド９を平板状のロードビーム
Ｉの自由端にフレキシャー４を介して取り付け、他端に
は取付マウント５を配置した構造となっている。
ロードビームｌは、ステンレス等の弾性材料からなり、
取付マウント５側を底辺とする略二等辺三角形をなして
おり、各斜辺に相当する部分には曲げ加工２ａ、２ｂが
施されている。
第２図（ａ）において、フレキンヤ−４ａは、ステンレ
ス等の弾性部材からなる略方形平板状であって、打抜き
等により成形されたものである。
そして、その平面形状が方形の平板部４１の一辺４２ｂ
には、このフレキシャー４ａをロードビームｌに弾力的
に固着するための、辺４２ｂがら外方に展延されたロー
ドビーム取付面４５が形成されている。また、平板部４
１には、略中央部から他方の一辺４２ａに至る部分には
、磁気ヘッド９を緩衝的に吊持するための磁気ヘッド吊
持部４７が設けられている。
本発明においては、このような形状の７レキシヤー４ａ
にあって、上記平板部４１のロードビームｌの長手方向
に沿う両側縁部４３ａ、４３ｂには、第２図（ｂ）のＡ
−Ａ矢視図に示すように、これら両側縁部と所定の角度
を有して交叉するフレキシャー補強部材４６２Ｌ、４６
ｂが一体に設けられていることを特徴としている。
ロートビーム取付面４５は、先端縁か若干円弧に近いも
のとなっているが、フレキシャー４ａがこの取付面４５
にてロードビーム１の下面に取り付けられたときに、磁
気ヘッドを支持する作用点を分散させるためである。ま
た、両側縁部４３ａ。
４３ｂに設けられるフレキシャー補強部材４６ａ。
４６ｂは、プレスによる曲げ加工により一体に形成され
たものである。
このようなフレキシャー４ａでは、ロードビーム取付面
４５の仮想底辺４４に対しその短辺４２ｂが相対的に伸
長された形状となっている。すなわち、磁気ヘッド９の
加重を支持する取付面４５の幅に対し平板部４１の幅を
広く設けてその剛性を高めている。
さらに、フレキシャー４の他の実施例を、第３図に、前
述の実施例と同様の部分には同一符号で示すと、フレキ
シャー４ｂは、方形の平板部４１の対向する両側縁部４
３ａ、、４３ｂに、フレキシャー補強部材４６ａ、４６
ｂが一体に取り付けられている。そして、平板部４１の
略中央から一辺４２ａ側にかけて磁気ヘッド吊持部４７
か設けられているか、本実施例では、ロードビーム取付
面４５ｂが平板部４１の一部として辺４２ｂ側に含まれ
、とくに展延して設けたものとはなっていない。これは
、フレキンヤー補強Ｉｌ材４６ ａ、 ４６ｂを設ける
ことによる剛性の向上によりフレキシャー４ｂ自体の板
厚を薄くすることが可能となり、磁気ヘッド９を吊持す
るのに、吊持部４７だけて十分緩衝的に支持できるので
ある。このことは、フレキシャー４の加工を容易にし、
製造上のコストメリットを生むことができる。
このような構成のフレキシャー４は、第１図に示される
ように、ロードビーム取付面４５の上面でロードビーム
Ｉの自由端の下面に固着され、吊持部４７の略Ｕ字部分
の下面に磁気ヘッド９のスライダ３が吊持される。そし
て、ロードビームＩと磁気ヘッド９とは、フレキシャー
４がバネ体として緩衝的に介在して結合される。
このとき、両側縁部４３ａ、４３ｂに一体に取り付けら
れたフレキシャー補強部材４６ａ、４６ｂは、平板部４
１の剛性をさらに高くする。このように、剛性を高める
ことにより、ねじり振動に対するフレキシャー４の固有
振動のピーク周波数を上げ、１次、２次のねじりモード
の共振を回避するのである。
本発明者は、ドライブ装置の高速化を阻害するフレキシ
ャーの振動を解析した結果、ねじり振動に対する共振を
、その固有振動を上げることにより対処することを知得
したもので、ちなみに、従来のフレキシャーと本発明に
係るフレキシャーとにおける支持装置系の固有振動解析
結果を次頁の第１表に示す。
第１表
（以下余白）
第１表の数値は、本発明の支持装置と従来のフレキシャ
ーを備えた支持装置の各振動モードにおけるピーク周波
数であり、このうち、ねじり１次。
２次モードが問題となる。尚、板厚は、ステンレスにな
るフレキンヤーの平板部の厚みである。
尚、本発明の支持装置におけるフレキンヤーは、両側縁
部４３ａ、４３ｂに設けられるフレキンヤー補強部材４
６ａ、４６ｂは、曲げ加工により成形されたものに限ら
ず、他に作製した部材を一体に取り付けるものであって
もよく、また、その取付角度は平板部４１の剛性を高め
得る〔囲の角度を有して取り付けられる。
【効果］
以上説明した構成によれば、フレキンヤーの縦方向の弾
力性を維持したうえで、剛性を高ぬて支持装置系のねじ
り振動に対する共振点を上げ得る。
従って、ドライブ時の磁気ヘッドの浮上姿勢を安定させ
ることができ、磁気ディスク装置の高速シークに対応し
得るという効果を奏する。Embodiments of the present invention will be described with reference to FIGS. 1 to 3. The support device IO has a structure in which a magnetic head 9 is attached to the free end of a flat load beam I via a flexure 4, and a mounting mount 5 is arranged at the other end. The load beam l is made of an elastic material such as stainless steel,
It has a substantially isosceles triangular shape with the base facing the mounting mount 5, and bending processes 2a and 2b are applied to the portions corresponding to the oblique sides. In FIG. 2(a), the flexible ring 4a has a substantially rectangular flat plate shape made of an elastic member such as stainless steel, and is formed by punching or the like. One side 42b of the flat plate portion 41 whose planar shape is rectangular.
A load beam mounting surface 45 is formed extending outward from the side 42b for elastically fixing the flexure 4a to the load beam l. In addition, the flat plate part 4
1 is provided with a magnetic head suspension portion 47 for suspending the magnetic head 9 in a cushioning manner from the substantially central portion to the other side 42a. In the present invention, 7 lexiers 4a having such a shape are used.
2(b).
- As shown in the A arrow view, flexure reinforcing members 462L and 46 intersect with these both side edges at a predetermined angle.
b is integrally provided. The rotor beam mounting surface 45 has a tip edge that is slightly close to an arc, and the flexure 4a is attached to this mounting surface 45.
This is to disperse the points of action that support the magnetic head when it is attached to the lower surface of the load beam 1. Moreover, both side edge parts 43a. A flexure reinforcing member 46a provided at 43b. 46b is integrally formed by bending using a press. In such a flexure 4a, the short side 42b thereof is extended relative to the virtual base 44 of the load beam mounting surface 45. That is, the width of the flat plate part 41 is made wider than the width of the mounting surface 45 that supports the load of the magnetic head 9, thereby increasing its rigidity. Further, another embodiment of the flexure 4 is shown in FIG. 3, where the same parts as in the above-mentioned embodiment are denoted by the same reference numerals.
3a, 43b, flexure reinforcing members 46a, 46
b is attached integrally. A magnetic head suspension section 47 extends from approximately the center of the flat plate section 41 to the side 42a.
In this embodiment, the load beam mounting surface 45b is included on the side 42b side as a part of the flat plate portion 41, and is not particularly provided in an extended manner. This is because the rigidity of the flexure 4b itself is improved by providing the flexure reinforcing materials 46a and 46b, and the thickness of the flexure 4b itself can be reduced, and the suspension portion 47 alone is sufficient to suspend the magnetic head 9. It can be supported as a buffer. This facilitates the processing of the flexure 4,
It can produce cost benefits in manufacturing. As shown in FIG. 1, the flexure 4 having such a configuration is fixed to the lower surface of the free end of the load beam I on the upper surface of the load beam mounting surface 45, and is fixed to the lower surface of the approximately U-shaped portion of the suspension portion 47. The slider 3 of the magnetic head 9 is suspended. The load beam I and the magnetic head 9 are coupled to each other with the flexure 4 interposed as a buffer as a spring body. At this time, the flexure reinforcing members 46a and 46b, which are integrally attached to both side edges 43a and 43b,
Further increase the rigidity of 1. In this way, by increasing the rigidity, the peak frequency of the natural vibration of the flexure 4 with respect to torsional vibration is increased, and resonance in the primary and secondary torsional modes is avoided. As a result of analyzing the vibration of the flexure that impedes the speeding up of the drive device, the present inventor learned that resonance with torsional vibration can be countered by increasing its natural vibration. Table 1 on the next page shows the results of natural vibration analysis of the support system for the flexure according to the present invention. Table 1 (blank space below) The values in Table 1 are the peak frequencies in each vibration mode of the support device of the present invention and the support device equipped with a conventional flexure, and among these, the first-order torsion. The secondary mode becomes a problem. Note that the plate thickness is the thickness of the flat plate part of the flexible stainless steel. Incidentally, the flexible yarn in the support device of the present invention includes flexible yarn reinforcing members 4 provided on both side edges 43a and 43b.
6a and 46b are not limited to those formed by bending, and may be integrally attached to other manufactured members, and the attachment angle can increase the rigidity of the flat plate portion 41. It can be installed with [Effect] According to the configuration described above, while maintaining the longitudinal elasticity of the flexible cable, the rigidity can be increased and the resonance point for torsional vibration of the support system can be raised. Therefore, it is possible to stabilize the flying posture of the magnetic head during driving, and it is possible to cope with the high-speed seek of the magnetic disk device.
第１図は本発明の支持装置を示す斜視図、第２図（ａ）
は改良されたフレキンヤーを示す平面図。
（ｂ）はＡ−Ａ矢視図、第３図は他のフレキンヤーの実
施例を示す平面図、第４図は従来のフレキンヤーを取り
付けた支持装置を示す斜視図、第５図は従来のフレキン
中−を示す平面図である。
】・・・・・ロードビーム、
３−・・・スライダ、
４．４ａ、４ｂ・・・・・・フレキンヤー、４１・・・
・平板部、
４３ ａ、 ４３ ｂ−・縁部、
４５ ・・ロードビーム取付面、
４６ａ、４６ｂ・・・・・・フレキンヤー補強部材４７
・・・・磁気ヘッド吊持部、
５・・・・・取付マウント、
９・ ・・磁気ヘッド、
９ａ・・・・磁気コイル、
９ｂ・・・・磁気コア。Fig. 1 is a perspective view showing the support device of the present invention, Fig. 2(a)
is a plan view showing an improved flexible cable. (b) is a view taken along arrow A-A, FIG. 3 is a plan view showing another embodiment of a flexible cable, FIG. 4 is a perspective view showing a support device to which a conventional flexible cable is attached, and Figure 5 is a conventional flexible cable. It is a top view showing the inside. ]...Load beam, 3-...Slider, 4.4a, 4b...Flexing ear, 41...
・Flat plate portion, 43 a, 43 b-・Edge portion, 45 ・Load beam mounting surface, 46 a, 46 b ・・Flexible reinforcement member 47
...Magnetic head suspension part, 5...Mounting mount, 9...Magnetic head, 9a...Magnetic coil, 9b...Magnetic core.
Claims (1)
ヘッドを保持するフレキシャーと、該フレキシャーを長
手方向の一端に取り付け、他端には取付マウントを具備
してなるロードビームとから構成する浮上式磁気ヘッド
の支持装置において、上記フレキシャーのロードビーム
長手方向に沿う両側縁部にフレキシャー補強部材を設け
ることを特徴とする浮上式磁気ヘッドの支持装置。A floating type consisting of a flexure that holds a magnetic head that flies above a recording medium to record or reproduce information, and a load beam that has the flexure attached to one longitudinal end and a mounting mount at the other end. 1. A floating magnetic head support device, characterized in that flexure reinforcing members are provided on both side edges of the flexure along the longitudinal direction of the load beam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2287866A JP2771690B2 (en) | 1990-10-25 | 1990-10-25 | Floating magnetic head support device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2287866A JP2771690B2 (en) | 1990-10-25 | 1990-10-25 | Floating magnetic head support device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04162271A true JPH04162271A (en) | 1992-06-05 |
| JP2771690B2 JP2771690B2 (en) | 1998-07-02 |
Family
ID=17722768
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2287866A Expired - Lifetime JP2771690B2 (en) | 1990-10-25 | 1990-10-25 | Floating magnetic head support device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2771690B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6002548A (en) * | 1992-11-27 | 1999-12-14 | Fujitsu Limited | Magnetic head supporting mechanism |
| US6522505B1 (en) | 1992-11-27 | 2003-02-18 | Fujitsu Limited | Magnetic head supporting mechanism |
| JP2009026441A (en) * | 2007-07-06 | 2009-02-05 | Shinka Jitsugyo Kk | Head gimbal assembly and system provided with head gimbal assembly |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0283871A (en) * | 1988-09-20 | 1990-03-23 | Hitachi Ltd | Transducer supporting device and rotary discoid recorder |
| JPH03245381A (en) * | 1990-02-21 | 1991-10-31 | Nec Corp | Magnetic head assembly |
-
1990
- 1990-10-25 JP JP2287866A patent/JP2771690B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0283871A (en) * | 1988-09-20 | 1990-03-23 | Hitachi Ltd | Transducer supporting device and rotary discoid recorder |
| JPH03245381A (en) * | 1990-02-21 | 1991-10-31 | Nec Corp | Magnetic head assembly |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6002548A (en) * | 1992-11-27 | 1999-12-14 | Fujitsu Limited | Magnetic head supporting mechanism |
| US6212041B1 (en) | 1992-11-27 | 2001-04-03 | Fujitsu Limited | Magnetic head supporting mechanism |
| US6522505B1 (en) | 1992-11-27 | 2003-02-18 | Fujitsu Limited | Magnetic head supporting mechanism |
| US6560073B1 (en) | 1992-11-27 | 2003-05-06 | Fujitsu Limited | Magnetic head supporting mechanism |
| JP2009026441A (en) * | 2007-07-06 | 2009-02-05 | Shinka Jitsugyo Kk | Head gimbal assembly and system provided with head gimbal assembly |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2771690B2 (en) | 1998-07-02 |
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