JP2913362B2 - Magnetic disk drive - Google Patents
Magnetic disk driveInfo
- Publication number
- JP2913362B2 JP2913362B2 JP978294A JP978294A JP2913362B2 JP 2913362 B2 JP2913362 B2 JP 2913362B2 JP 978294 A JP978294 A JP 978294A JP 978294 A JP978294 A JP 978294A JP 2913362 B2 JP2913362 B2 JP 2913362B2
- Authority
- JP
- Japan
- Prior art keywords
- hub
- magnetic disk
- peripheral surface
- disk drive
- outer peripheral
- 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 - Fee Related
Links
- 230000002093 peripheral effect Effects 0.000 claims description 22
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 18
- 239000011248 coating agent Substances 0.000 claims description 17
- 238000000576 coating method Methods 0.000 claims description 17
- 229920001721 polyimide Polymers 0.000 claims description 11
- 229910052742 iron Inorganic materials 0.000 claims description 9
- 239000004642 Polyimide Substances 0.000 claims description 8
- 238000005530 etching Methods 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 239000002985 plastic film Substances 0.000 description 7
- 229920006255 plastic film Polymers 0.000 description 7
- 229910052782 aluminium Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 229920002120 photoresistant polymer Polymers 0.000 description 3
- 239000002243 precursor Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Landscapes
- Rotational Drive Of Disk (AREA)
Description
【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION
【０００１】[0001]
【産業上の利用分野】本発明は、磁気ディスク駆動装
置、特に、磁気ディスクが外周面に装着されると共に鉄
系の金属からなるハブを備え、互いに対向するロータマ
グネットとステータとの相対回転によりハブが駆動する
磁気ディスク駆動装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk drive, and more particularly, to a magnetic disk drive having a magnetic disk mounted on an outer peripheral surface thereof and having a hub made of an iron-based metal. The present invention relates to a magnetic disk drive driven by a hub.
【０００２】[0002]
【従来の技術】従来から、例えば、図３（Ａ）に示すよ
うに（特開平４−８８８５７号公報参照）、外周面１ａ
に磁気ディスク２が装着されるハブ１と、ハブ１の内周
面１ｂに固定されたロータマグネット３と、ロータマグ
ネット３に対向するステータ４を固定すると共に軸受
５，５を介してハブ１を回転自在に支持するブラケット
６とを備え、ステータ４のコイル７に流れる電流とロー
タマグネット３の磁力とによりハブ１が磁気ディスク２
と一体に回転する磁気ディスク駆動装置８が知られてい
る。2. Description of the Related Art Conventionally, for example, as shown in FIG.
A hub 1 on which a magnetic disk 2 is mounted, a rotor magnet 3 fixed to the inner peripheral surface 1b of the hub 1, and a stator 4 facing the rotor magnet 3 are fixed, and the hub 1 is A hub 6 rotatably supported, and the hub 1 is connected to the magnetic disk 2 by the current flowing through the coil 7 of the stator 4 and the magnetic force of the rotor magnet 3.
There is known a magnetic disk drive 8 that rotates integrally with the magnetic disk drive.
【０００３】ハブ１は鉄材が使用され、このハブ１に載
置される磁気ディスク２はアルミ材のものが使用されて
いる。The hub 1 is made of an iron material, and the magnetic disk 2 placed on the hub 1 is made of an aluminum material.
【０００４】[0004]
【発明が解決しようとする課題】ところで、上記の如く
構成された磁気ディスク駆動装置８にあっては、ハブ１
は鉄材、磁気ディスク２はアルミ材でできているため、
鉄とアルミの線膨張係数に大きな差があり、温度差によ
りハブ１に載置された磁気ディスク２が初期の位置から
ズレてしまい、初期状態でフォーマティングしても、こ
のズレにより磁気ディスク２上のトラックがヘッド（共
に図示せず）に対してオフセットしてしまい、トラック
の読み込みや書き込みに支障がでるという虞があった。By the way, in the magnetic disk drive 8 constructed as described above, the hub 1
Is made of iron material and the magnetic disk 2 is made of aluminum material.
There is a large difference in the linear expansion coefficient between iron and aluminum, and the magnetic disk 2 mounted on the hub 1 is displaced from the initial position due to the temperature difference. The upper track is offset with respect to the head (both not shown), and there is a possibility that reading and writing of the track may be hindered.
【０００５】 そこで、図３（Ｂ），（Ｃ）に示すよう
に、両面テープ（図示せず）を介して厚さ０．０５ｍｍ
〜０．１ｍｍ程度のプラスチックフィルム９の放射状部
９ａ，９ａ…を外周面１０ａに添着した鉄製のハブ１０
をハブ１の代りに使用して磁気ディスクのズレ防止対策
とした。Therefore, as shown in FIGS. 3B and 3C, a thickness of 0.05 mm is applied via a double-sided tape (not shown).
~0.1mm about radial portion 9a of the plastic film 9, the hub 10 made of iron impregnated with 9a ... on the outer peripheral surface 10a
Was used in place of the hub 1 to prevent the magnetic disk from shifting.
【０００６】 しかしながら、精度良くプラスチックフ
ィルム９をハブ１０に添着するのが困難であるばかりで
なく、プラスチックフィルム９の貼り付けが手作業とな
り煩雑でコストが高騰し、しかも、プラスチックフィル
ム９がハブ１０から剥がれ易いという新たな問題が生じ
た。[0006] However, the accuracy of well plastic film 9 not only it is difficult to affixed to the hub 10, complicated and cost pasting of plastic film 9 is the manual is soaring, moreover, plastic film 9 is hub There is a new problem that it is easily peeled off from No. 10.
【０００７】本発明は、上記実状に鑑み、温度変化に起
因するハブと磁気ディスクとのズレを効率良く防止し得
て、磁気ディスクの読み込みや書き込みに支障が生じる
ことなく、しかも、耐久性や信頼性並びに生産性の向上
を安価に実現することができる磁気ディスク駆動装置を
提供することを目的とするものである。In view of the above situation, the present invention can efficiently prevent a deviation between a hub and a magnetic disk due to a temperature change, and does not hinder reading and writing of the magnetic disk, and furthermore, has a high durability and It is an object of the present invention to provide a magnetic disk drive capable of improving reliability and productivity at low cost.
【０００８】[0008]
【課題を解決するための手段】 本発明は、その目的を
達成するため、磁気ディスクが外周面に装着されると共
に前記磁気ディスクとは線膨張係数の異なる鉄系の金属
からなるハブを備え、互いに対向するロータマグネット
とステータとの相対回転により前記ハブが駆動する磁気
ディスク駆動装置において、前記ハブの外周面にポリイ
ミド系の被膜が部分的に設けられていることを要旨とす
るものである。Means for Solving the Problems In order to achieve the object, the present invention comprises a hub having a magnetic disk mounted on an outer peripheral surface and made of an iron-based metal having a different linear expansion coefficient from the magnetic disk , In a magnetic disk drive in which the hub is driven by the relative rotation of a rotor magnet and a stator facing each other, the invention is characterized in that a polyimide coating is partially provided on the outer peripheral surface of the hub.
【０００９】[0009]
【作用】この様な構成においては、鉄系の金属からなる
ハブの外周面にポリイミド系の被膜が部分的に設けら
れ、ハブの外周面に磁気ディスクが装着されると共に互
いに対向するロータマグネットとステータとの相対回転
によりハブが駆動する。In such a configuration, a polyimide coating is partially provided on the outer peripheral surface of a hub made of an iron-based metal, and a magnetic disk is mounted on the outer peripheral surface of the hub and a rotor magnet opposed to each other is provided. The hub is driven by relative rotation with the stator.
【００１０】[0010]
【実施例】次に、本発明の磁気ディスク駆動装置の実施
例を図１乃至図２に基づいて説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the magnetic disk drive of the present invention will be described with reference to FIGS.
【００１１】図１（Ａ）において、磁気ディスク駆動装
置１１は、外周面１２ａに磁気ディスク１３が装着され
るハブ１２と、ハブ１２の内周面１２ｂに固定されたロ
ータマグネット１４と、ロータマグネット１４に対向す
るステータ１５を固定すると共に軸受１６，１６を介し
てハブ１２を回転自在に支持するフレ−ム１７とを備え
ている。Referring to FIG. 1A, a magnetic disk drive 11 includes a hub 12 having an outer peripheral surface 12a on which a magnetic disk 13 is mounted, a rotor magnet 14 fixed to an inner peripheral surface 12b of the hub 12, and a rotor magnet 14. A frame 17 is provided for fixing the stator 15 opposing the hub 14 and rotatably supporting the hub 12 via bearings 16 and 16.
【００１２】有底円筒状のハブ１２は鉄性のものが使用
され、ハブ１２に載置される磁気ディスク１３はアルミ
性のものが使用されている。また、ハブ１２の底部１２
ｃには軸部１２ｄが突出形成されていて、この軸部１２
ｄをフレ−ム１７の保持筒部１７ａ内に臨ませることに
より軸受１６，１６を介してフレ−ム１７にハブ１２が
回転可能に保持される。さらに、ハブ１２の外周面１２
ａにはポリイミド系の被膜１８，１８…が設けられてい
る。The bottomed cylindrical hub 12 is made of iron, and the magnetic disk 13 mounted on the hub 12 is made of aluminum. Also, the bottom 12 of the hub 12
c, a shaft portion 12d is formed so as to protrude therefrom.
The hub 12 is rotatably held on the frame 17 via the bearings 16 and 16 by allowing the d to face the holding cylinder 17a of the frame 17. Further, the outer peripheral surface 12 of the hub 12
a is provided with a polyimide-based coating film 18.
【００１３】被膜１８は、印刷やエッチング等によりハ
ブ１２の外周面１２ａ（底部１２ｃの表面に跨ってもよ
い）に生成されている。The coating 18 is formed on the outer peripheral surface 12a of the hub 12 (which may straddle the surface of the bottom 12c) by printing, etching, or the like.
【００１４】印刷により被膜１８を生成する場合には、
ハブ１２の外周面１２ａの必要な部分にマスキングを施
してポリイミド前駆体溶液を印刷した後、加熱乾燥させ
ることにより所望の位置に被膜１８を生成することがで
きる。When the coating 18 is produced by printing,
After a necessary portion of the outer peripheral surface 12a of the hub 12 is masked and the polyimide precursor solution is printed, the coating is heated and dried to form the coating 18 at a desired position.
【００１５】また、エッチングにより被膜１８を生成す
る場合には、図２（Ａ）〜（Ｇ）に示すように、ポリイ
ミド前駆体溶液をハブ１２の外周面１２ａに塗布してポ
リイミド膜１９を形成（図２（Ａ））し、その上にフォ
トレジスト膜２０を塗布（図２（Ｂ））して所望のパタ
ーンで露光（図２（Ｃ））してマスク部分のフォトレジ
スト膜２０をフォトレジスト現象により除去（図２
（Ｄ））する。When the film 18 is formed by etching, a polyimide precursor solution is applied to the outer peripheral surface 12a of the hub 12 to form a polyimide film 19, as shown in FIGS. (FIG. 2A), a photoresist film 20 is applied thereon (FIG. 2B), and is exposed in a desired pattern (FIG. 2C). Removal by resist phenomenon (Fig. 2
(D)).
【００１６】次に、ポリイミド膜１９のうちフォトレジ
スト膜２０が除去された部分に対応した部分をエッチン
グ処理（図２（Ｅ））し、残りのフォトレジスト膜２０
を剥離（図２（Ｆ））した後、残りのポリイミド膜１９
を加熱硬化（図２（Ｇ））することにより外周面１２ａ
の所望部分に被膜１８が生成される。Next, a portion of the polyimide film 19 corresponding to the portion from which the photoresist film 20 has been removed is subjected to an etching process (FIG. 2E), and the remaining photoresist film 20 is removed.
After peeling (FIG. 2F), the remaining polyimide film 19 is removed.
Is heat-cured (FIG. 2 (G)) to form an outer peripheral surface 12a.
A coating 18 is formed on the desired portion of the substrate.
【００１７】磁気ディスク１３はハブ１２の外周面１２
ａと鍔部１２ｅとで所定位置に保持されている。The magnetic disk 13 is provided on the outer peripheral surface 12 of the hub 12.
a and the collar 12e are held at predetermined positions.
【００１８】ステータ１５は、フレ−ム１７の保持筒１
７ａの外周面１７ｂに固定された積層コア２１と、積層
コア２１に巻回されたコイル２２とを備えている。The stator 15 is a holding cylinder 1 for the frame 17.
The laminated core 21 includes a laminated core 21 fixed to the outer peripheral surface 17b of the laminated core 7a and a coil 22 wound around the laminated core 21.
【００１９】上記の構成において、ステータ１５のコイ
ル２２に流れる電流とロータマグネット１４の磁力とに
よりハブ１２が磁気ディスク１３と一体に回転し、この
磁気ディスク１３の回転により磁気ディスク１３上のト
ラックの読み込みや書き込みが可能となる。In the above configuration, the hub 12 rotates integrally with the magnetic disk 13 by the current flowing through the coil 22 of the stator 15 and the magnetic force of the rotor magnet 14, and the rotation of the magnetic disk 13 causes the tracks on the magnetic disk 13 to rotate. Reading and writing are possible.
【００２０】この際、ハブ１２と磁気ディスク１３との
間にポリイミド系の被膜１８が介在されていることによ
り温度変化に起因するハブ１２と磁気ディスク１３との
ズレが効率良く防止されるばかりでなく、ズレの防止を
実現したことにより磁気ディスク１３の読み込みや書き
込みに支障が生じることがない。At this time, since the polyimide coating 18 is interposed between the hub 12 and the magnetic disk 13, the misalignment between the hub 12 and the magnetic disk 13 due to a temperature change can be prevented efficiently. In addition, since the deviation is prevented, the reading or writing of the magnetic disk 13 is not hindered.
【００２１】また、被膜１８はプラスチックフィルム９
と異なって剥がれることがないので耐久性を向上させる
ことができ、よって信頼性をも向上させることができ
る。The coating 18 is made of a plastic film 9.
Unlike the case described above, it does not peel off, so that the durability can be improved, and the reliability can also be improved.
【００２２】しかも、両面テープによるプラスチックフ
ィルム９の添着作業と異なって機械的に被膜１８をハブ
１２に設けることができ、安価且つ生産性の高いハブ１
２を提供することができる。In addition, unlike the operation of attaching the plastic film 9 with the double-sided tape, the coating 18 can be mechanically provided on the hub 12, and the hub 1 is inexpensive and has high productivity.
2 can be provided.
【００２３】[0023]
【発明の効果】以上説明したように、本発明の磁気ディ
スク駆動装置にあっては、ハブの外周面にポリイミド系
の被膜が部分的に設けられていることにより、温度変化
に起因するハブと磁気ディスクとのズレを効率良く防止
し得て、磁気ディスクの読み込みや書き込みに支障が生
じることなく、しかも、耐久性や信頼性並びに生産性の
向上を安価に実現することができる。As described above, in the magnetic disk drive of the present invention, since the hub is partially provided with the polyimide-based coating on the outer peripheral surface of the hub, the hub is not affected by the temperature change. A deviation from the magnetic disk can be efficiently prevented, and there is no hindrance to reading and writing of the magnetic disk, and furthermore, durability, reliability and productivity can be improved at low cost.
【図１】本発明の磁気ディスク駆動装置を示し、（Ａ）
は磁気ディスク駆動装置の縦断面図、（Ｂ）はハブの外
観を示す斜視図である。FIG. 1 shows a magnetic disk drive of the present invention, wherein (A)
FIG. 1 is a longitudinal sectional view of a magnetic disk drive, and FIG. 1B is a perspective view showing an appearance of a hub.
【図２】（Ａ）〜（Ｇ）はハブに被膜を添着する工程を
時系列に示す説明図である。FIGS. 2 (A) to 2 (G) are explanatory views showing steps of applying a coating film to a hub in a time series.
【図３】従来の磁気ディスク駆動装置を示し、（Ａ）は
磁気ディスク駆動装置の縦断面図、（Ｂ）はハブの外観
を示す斜視図、（Ｃ）はプラスチックフィルムの平面図
である。3A and 3B show a conventional magnetic disk drive, wherein FIG. 3A is a longitudinal sectional view of the magnetic disk drive, FIG. 3B is a perspective view showing the appearance of a hub, and FIG. 3C is a plan view of a plastic film.
１１…磁気ディスク駆動装置 １２…ハブ １２ａ…外周面 １３…磁気ディスク １４…ロータマグネット １５…ステータ １８…被膜 DESCRIPTION OF SYMBOLS 11 ... Magnetic disk drive 12 ... Hub 12a ... Outer peripheral surface 13 ... Magnetic disk 14 ... Rotor magnet 15 ... Stator 18 ... Coating
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) G11B 19/20 ──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. 6 , DB name) G11B 19/20
Claims (3)
に前記磁気ディスクとは線膨張係数が異なる鉄系の金属
からなるハブを備え、互いに対向するロータマグネット
とステータとの相対回転により前記ハブが駆動する磁気
ディスク駆動装置において、 前記ハブの外周面にポリイミド系の被膜が部分的に設け
られていることを特徴とする磁気ディスク駆動装置。A magnetic disk is mounted on an outer peripheral surface, and a hub made of an iron-based metal having a linear expansion coefficient different from that of the magnetic disk is provided. The hub is rotated by a relative rotation between a rotor magnet and a stator facing each other. A magnetic disk drive to be driven, wherein a polyimide-based coating is partially provided on an outer peripheral surface of the hub.
に部分的に設けられていることを特徴とする請求項１に
記載の磁気ディスク駆動装置。2. The magnetic disk drive according to claim 1, wherein the coating is partially provided on an outer peripheral surface of the hub by printing.
外周面に部分的に設けられていることを特徴とする請求
項１に記載の磁気ディスク駆動装置。3. The magnetic disk drive according to claim 1, wherein the coating is partially provided on an outer peripheral surface of the hub by etching.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP978294A JP2913362B2 (en) | 1994-01-31 | 1994-01-31 | Magnetic disk drive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP978294A JP2913362B2 (en) | 1994-01-31 | 1994-01-31 | Magnetic disk drive |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07220381A JPH07220381A (en) | 1995-08-18 |
| JP2913362B2 true JP2913362B2 (en) | 1999-06-28 |
Family
ID=11729811
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP978294A Expired - Fee Related JP2913362B2 (en) | 1994-01-31 | 1994-01-31 | Magnetic disk drive |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2913362B2 (en) |
-
1994
- 1994-01-31 JP JP978294A patent/JP2913362B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07220381A (en) | 1995-08-18 |
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