JPH11113210A - Thin bearing equipment - Google Patents

Thin bearing equipment

Info

Publication number
JPH11113210A
JPH11113210A JP28292897A JP28292897A JPH11113210A JP H11113210 A JPH11113210 A JP H11113210A JP 28292897 A JP28292897 A JP 28292897A JP 28292897 A JP28292897 A JP 28292897A JP H11113210 A JPH11113210 A JP H11113210A
Authority
JP
Japan
Prior art keywords
magnet
coil
bearing
thin
turntable
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.)
Withdrawn
Application number
JP28292897A
Other languages
Japanese (ja)
Inventor
Kazutoshi Hirai
和年 平井
Yoshihito Yamamoto
喜仁 山本
Tsutomu Iimura
力 飯村
Hisashi Ikeda
久 池田
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.)
Namiki Precision Jewel Co Ltd
Original Assignee
Namiki Precision Jewel Co Ltd
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 Namiki Precision Jewel Co Ltd filed Critical Namiki Precision Jewel Co Ltd
Priority to JP28292897A priority Critical patent/JPH11113210A/en
Publication of JPH11113210A publication Critical patent/JPH11113210A/en
Withdrawn legal-status Critical Current

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Abstract

PROBLEM TO BE SOLVED: To provide a thin bearing equipment having a long life and a high resistance to shock which has also excellent precision in turntable surface wobbling, falling-down, and height precision. SOLUTION: In a facing type spindle motor rotating a disk, the wobbling of a turntable surface 4a is determine not by the clearance of a shaft 1 and a radial bearing 2 and bearing length, but by parallelism of the turntable surface 4a and the surface 5a on the coil 6 side of a magnet 5, flatness of the surface 5a on the coil 6 side of the magnet 5, and flatness of the surface 6a of the magnet 5 side of the coil 6. The falling-down of the turn table surface 4a is determined by parallelism of a motor fixing surface 7a and the surface 6a on the magnet 5 of the coil 6 and parallelism of the surface 5a on the coil 6 side of the magnet 5 and the turn table surface 4a.

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、スラスト受けを従来よ
りも直径と面積の大きい面受けにし、更に振れ・倒れの
精度が、軸受長やクリアランスによらないで、面平行度
できまる構成にすることにより、薄型化が容易になり、
軸受面積を増加させ、点受けで問題であった衝撃荷重に
よる圧痕が原因の振動・異音を減少させ、振れ・倒れ・
高さ寸法精度が向上する等薄型高密度ディスク記憶装置
用スピンドルモータに適した、軸受け構成に関する。
BACKGROUND OF THE INVENTION The present invention relates to a thrust bearing having a surface bearing having a larger diameter and area than conventional ones, and furthermore, the accuracy of run-out / fall can be made parallel to the surface without depending on the bearing length or clearance. By doing, thinning becomes easy,
Increased bearing area, reduced vibration and abnormal noise caused by indentation due to impact load, which was a problem with spot bearings,
The present invention relates to a bearing configuration suitable for a spindle motor for a thin and high-density disk storage device such as an improved height dimensional accuracy.

【0002】[0002]

【従来の技術および課題】従来より、レコードプレー
ヤ,CDプレーヤ,フロッピーディスクドライブ,ハー
ドディスクドライブ,光ディスクドライブ等ダイレクト
ドライブ方式のスピンドルモータでは、記憶容量の増加
に伴いシャフトの直角度とターンテーブル面振れの厳し
いスペックが必要となった。
2. Description of the Related Art Conventionally, in a direct drive type spindle motor such as a record player, a CD player, a floppy disk drive, a hard disk drive, and an optical disk drive, as the storage capacity increases, the shaft squareness and the turntable surface runout increase. Strict specifications were required.

【0003】モータの厚みが厚く、軸受スパンが長くと
れる場合は大きな問題はなかったが、小型,薄型,ポー
タブルタイプへとドライブユニットが移行していく段階
で、モータもターンテーブル込みで10mm以下と極端に薄
い要求がでてきた。
There was no major problem when the motor thickness was large and the bearing span could be long. However, when the drive unit was transitioning to a small, thin, and portable type, the motor, including the turntable, was extremely small at 10 mm or less. Thin demands came out.

【0004】しかしながら、ベルトやギヤー等側圧を受
けるタイプのモータでは薄型モータも比較的容易に作れ
るが、ディスクモータではスラスト荷重を受けながらか
つターンテーブル面振れを防止し、さらに面倒れもない
ように維持しなければならないので、薄型で構成するの
は困難であった。
However, a thin motor can be made relatively easily with a motor that receives side pressure such as a belt or a gear. However, a disk motor receives a thrust load and prevents the turntable from oscillating, so that it does not fall down. Since it had to be maintained, it was difficult to make it thin.

【0005】従来のスピンドルモータの例を図2に示
す。図2中1はロータシャフト,2はラジアル軸受,3
はスラスト軸受,4はターンテーブル,5はロータマグ
ネット,6はステータコイル,7はモータ取付ベース,
8はブッシュである。
FIG. 2 shows an example of a conventional spindle motor. In FIG. 2, 1 is a rotor shaft, 2 is a radial bearing, 3
Is a thrust bearing, 4 is a turntable, 5 is a rotor magnet, 6 is a stator coil, 7 is a motor mounting base,
8 is a bush.

【0006】スピンドルモータの軸受は、図2に示すよ
うに、軸受2として,例えばボールベアリング2個、ス
リーブメタル2個、ボールベアリングとスリーブメタル
との組合せ等の構成で、スラスト荷重受けは、ボールベ
アリングのボールの個数の多点受けか、シャフト端面を
凸球R面にして、平面、又は凹球R面で受ける点受け構
成が主流であった。
As shown in FIG. 2, the bearing of the spindle motor has, for example, two ball bearings, two sleeve metals, a combination of a ball bearing and a sleeve metal, and the like. The mainstream configuration is a multipoint bearing with the number of balls in the bearing, or a point bearing configuration in which the shaft end face is made into a convex spherical R surface and received on a flat surface or a concave spherical R surface.

【0007】ターンテーブル面の振れ精度は、ラジアル
軸受スパンと、シャフトと軸受のクリアランスとの関
係,ロータ回転シャフトとターンテーブル面の直角度と
に関係していた。その為軸受スパンが短くなると高精度
な振れ精度を維持するのが困難であった。又、スラスト
の点受けは接触面積が小さい為、スラスト荷重が小さな
面積に集中し大きな圧力となる為、特に衝撃に対して問
題があった。
The run-out accuracy of the turntable surface has been related to the relationship between the radial bearing span, the clearance between the shaft and the bearing, and the perpendicularity between the rotor rotating shaft and the turntable surface. Therefore, it has been difficult to maintain high precision runout accuracy when the bearing span is shortened. In addition, since the contact area of the thrust bearing has a small contact area, the thrust load is concentrated on a small area and a large pressure is applied.

【0008】ディスク記憶装置の高密度化に伴い、ター
ンテーブル面の振れ・倒れ・高さ公差を小さくし、高精
度に維持することが課題となった。反面、薄型化に伴い
軸受長は必然的に短くなり、軸受長が関係する構成で
は、加工精度が限界を越えてきており、軸受スパンに頼
らないで高精度維持が出来る構成が望まれていた。又マ
ルチメディア対応になり、スピンドルモータも200rpm〜
10000rpm等広い範囲の回転数に対して振れ、倒れの精度
維持が要求されている。
With the increase in the density of the disk storage device, it has become an issue to reduce the run-out / fall-down / height tolerance of the turntable surface and maintain high accuracy. On the other hand, the bearing length is inevitably shortened with the reduction in thickness, and in the configuration related to the bearing length, the processing accuracy has exceeded the limit, and a configuration that can maintain high accuracy without relying on the bearing span has been desired. . In addition, it is compatible with multimedia, and spindle motor is 200rpm ~
For a wide range of rotation speeds such as 10000 rpm, it is required to maintain the accuracy of swing and fall.

【0009】従来の軸受構成は点受けであるために、特
に衝撃荷重に対して圧痕を生じやすく、ボールベアリン
グは多点受けではあるが、偏荷重などで一部に圧痕が生
じた場合、ボールが転がり移動をする為、振動・異音が
大きく現れ、トラッキングエラー等の市場クレームが発
生して、寿命に問題があった。シャフト端面受けの場合
も、部分的圧痕が摩耗を促進させ寿命を著しく悪化させ
るものが生れる原因となっていた。
Since the conventional bearing configuration is a point bearing, an indentation is apt to occur particularly against an impact load. Although a ball bearing is a multipoint bearing, if a partial indentation occurs due to an uneven load, etc. Because of the rolling movement, large vibrations and abnormal noises appeared, and market complaints such as tracking errors occurred, resulting in a problem with the life. Also in the case of the shaft end face bearing, the partial indentation accelerates abrasion and causes the life to be remarkably deteriorated.

【0010】本発明の目的は、上記のような欠点を解決
し、ターンテーブル面振れ・倒れ・高さ寸法精度の高
い、しかも衝撃に強い長寿命の薄型軸受装置を提供する
ものである。
An object of the present invention is to solve the above-mentioned drawbacks and to provide a long-life thin bearing device which has high accuracy of turntable surface runout, fall, and height dimension, and is resistant to impact.

【0011】さらに詳しく述べると、本発明は、ディス
クをターンテーブル面にのせ回転させるスピンドルモー
タに於て、ターンテーブル面の面振れ・面倒れ・面高さ
寸法が、温度変化や、広い回転数変化に対して高精度に
維持され、薄型ポータブルタイプでも衝撃に対して強
い、薄型高密度ディスク記憶装置用スピンドルモータに
適した、薄型軸受装置を提供するものである。
More specifically, the present invention relates to a spindle motor for rotating a disk placed on a turntable surface. An object of the present invention is to provide a thin bearing device which is maintained with high precision against a change and is resistant to shock even in a thin portable type, and is suitable for a spindle motor for a thin high-density disk storage device.

【0012】[0012]

【課題を解決するための手段】本発明は、前記従来の課
題を解決するためになされたもので、本発明の実施例に
対応する図1を用いて説明すると、請求項1記載の発明
は、ディスクを回転させる面対向型スピンドルモータに
於て、ターンテーブル面4aの振れが、シャフト1とラ
ジアル軸受2のクリアランス、軸受長によらないで、タ
ーンテーブル面4aとマグネット5のコイル6側の面5
aとの平行度、マグネット5のコイル6側の面5aの平
面度、コイル6のマグネット5側の面6aの平面度で決
定され、ターンテーブル面4aの倒れが、モータ取付け
面7aとコイル6のマグネット5側の面6aとの平行度
及びマグネット5のコイル6側の面5aとターンテーブ
ル面4aとの平行度で決定されるように構成したもので
ある。
SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and will be described with reference to FIG. 1 corresponding to an embodiment of the present invention. In the surface-facing spindle motor for rotating the disk, the run-out of the turntable surface 4a is not dependent on the clearance between the shaft 1 and the radial bearing 2 and the bearing length. Face 5
a, the flatness of the surface 5a of the magnet 5 on the side of the coil 6, and the flatness of the surface 6a of the coil 6 on the side of the magnet 5, the inclination of the turntable surface 4a is determined by the motor mounting surface 7a and the coil 6 Of the magnet 5 and the parallelism of the magnet 5 and the turntable surface 4a.

【0013】また、請求項2記載の発明は、請求項1記
載の薄型軸受装置において、前記コイル6またはマグネ
ット5のどちらか一方のリング状の対向面6aまたは5
aに動圧発生溝を設け、回転時にコイル6とマグネット
5の対向面が平行隙間で非接触支持されるように構成し
たものである。
According to a second aspect of the present invention, there is provided the thin bearing device according to the first aspect, wherein either the coil 6 or the magnet 5 has a ring-shaped facing surface 6 a or 5.
a is provided with a dynamic pressure generating groove so that the opposing surfaces of the coil 6 and the magnet 5 are supported in a non-contact manner by a parallel gap during rotation.

【0014】また、請求項3記載の発明は、請求項1ま
たは2記載の薄型軸受装置において、前記コイル6とマ
グネット5間のリング状対向面の少なくとも一方の面
に、耐摩耗性のニッケルメッキ等の表面処理を施すか、
または耐摩耗性のガラスまたはセラミック系等よりなる
高硬度の薄いシートを接着するか、または、前記高硬度
の薄いシートを接着した上に前記表面処理を施して構成
したものである。
According to a third aspect of the present invention, in the thin bearing device according to the first or second aspect, at least one of the ring-shaped facing surfaces between the coil 6 and the magnet 5 is nickel-plated with wear resistance. Surface treatment such as
Alternatively, a high-hardness thin sheet made of abrasion-resistant glass or ceramics is bonded, or the high-hardness thin sheet is bonded and the surface treatment is performed.

【0015】[0015]

【作用】本発明によると、回転側と固定側の2平面のリ
ング面で軸受を構成し、平面ならいでロータが回転する
ので、軸受スパン,クリアランス,直角度に関係しない
で振れ精度が維持できる。
According to the present invention, the bearing is constituted by the two ring surfaces of the rotating side and the fixed side, and the rotor rotates in the same plane, so that the runout accuracy can be maintained irrespective of the bearing span, clearance and squareness. .

【0016】通常面対向の場合、同一形状で電流を減少
させるために磁束密度を大きくする場合が多いが、この
ためマグネット吸引力が大きくなって、吸引によるスラ
スト荷重が大きくなる欠点がある。さらに2平面で軸受
を構成した場合、接触面積が大きくなり、摩擦力が大き
くなって軸受ロスが増加し、モータ定常電流を増加さ
せ、起動トルクを減少させる欠点がある。
Usually, in the case of opposed surfaces, the magnetic flux density is often increased in order to reduce the current in the same shape, but this has the drawback that the magnet attraction force increases and the thrust load due to the attraction increases. Further, when the bearing is constituted by two planes, there are disadvantages that the contact area increases, the frictional force increases, the bearing loss increases, the motor steady current increases, and the starting torque decreases.

【0017】しかしながら、本発明では、スラスト荷重
はシャフト端面のような小さな面積で受け、面振れ・面
倒れの性能は、面積の大きな2平面で維持するようにス
ラスト軸受を構成しているので、ラジアル軸受はシャフ
トのセンター位置を維持するだけの機能になり、長さが
短くてもその機能は維持できる。
However, in the present invention, the thrust bearing is configured such that the thrust load is received in a small area such as the end face of the shaft, and the surface runout / falling performance is maintained in two large planes. The radial bearing only functions to maintain the center position of the shaft, and the function can be maintained even if the length is short.

【0018】また、シャフトのすりこぎ運動は、2平面
で発生する動圧が大きければ発生しないので、面積の大
きい2平面で軸受を構成してあるので、性能・強度共に
優れる。
Further, since the sliding motion of the shaft is not generated if the dynamic pressure generated in the two planes is large, the bearing is constituted by the two planes having a large area, so that both performance and strength are excellent.

【0019】さらに、表面処理で表面硬度を上げ、平面
度・面粗さをよくすれば、圧痕が生じにくくなり、耐摩
耗・長寿命に効果がある。また、軸受長が振れに影響し
なくなった為に、これまでは軸受長を確保する為に、圧
入代を短くしたり等していたが、圧入代が十分とれるよ
うになり、機械的強度、耐衝撃性が向上する。
Furthermore, if the surface hardness is increased by the surface treatment and the flatness and surface roughness are improved, indentation is less likely to occur, which is effective in abrasion resistance and long life. In addition, since the bearing length has no effect on the run-out, the press-fit allowance has been shortened or the like in order to secure the bearing length, but the press-fit allowance can be sufficient, and the mechanical strength and Improves impact resistance.

【0020】[0020]

【実施例】以下、本発明の実施例について、図面を参照
して説明する。図1は本発明の実施例の薄型軸受装置を
説明する断面図である。
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view illustrating a thin bearing device according to an embodiment of the present invention.

【0021】図1に示すディスクを回転させる薄型スピ
ンドルモータにおいて、回転子側には、マグネット5が
固着されたターンテーブル4がブッシュ8に固定され、
このブッシュ8に回転シャフト1が挿入固定されてい
る。また、固定子側には、回転シャフト1が挿入される
シャフト挿入孔を有し、このシャフト挿入孔に回転シャ
フト1が挿入されて回転可能に支持するラジアル軸受2
が回転駆動用コイル6を備えたモータ取付ベース7に固
定されている。
In the thin spindle motor for rotating a disk shown in FIG. 1, a turntable 4 to which a magnet 5 is fixed is fixed to a bush 8 on the rotor side.
The rotary shaft 1 is inserted and fixed to the bush 8. A radial bearing 2 having a shaft insertion hole on the stator side into which the rotary shaft 1 is inserted, and rotatably supporting the rotary shaft 1 inserted into the shaft insertion hole.
Are fixed to a motor mounting base 7 having a rotation driving coil 6.

【0022】図1に於て、ロータ部は、ターンテーブル
面4aとマグネット5のコイル6側の面5aとの平行度
を1分,高さ寸法公差を0.05mmで管理した。また、マグ
ネット5のコイル6側の面5aには、動圧溝を設け、回
転が速くなれば動圧力が働くようにした。マグネット5
のコイル6側の面5aは、表面処理後研磨加工をして平
面度を出した。ステータ部は、モータ取付け面7aとコ
イル6のマグネット側の面6aとの平行度を1分,高さ
寸法公差を0.05mmで管理した。
In FIG. 1, the rotor section was controlled such that the parallelism between the turntable surface 4a and the surface 5a of the magnet 5 on the coil 6 side was 1 minute, and the height dimensional tolerance was 0.05 mm. Further, a dynamic pressure groove is provided on the surface 5a of the magnet 5 on the coil 6 side, so that a dynamic pressure is applied as the rotation speed increases. Magnet 5
The surface 5a on the side of the coil 6 was polished after surface treatment to obtain flatness. The stator was controlled so that the parallelism between the motor mounting surface 7a and the magnet-side surface 6a of the coil 6 was 1 minute, and the height dimensional tolerance was 0.05 mm.

【0023】上記2平面、5a,6aはグリスをはさん
で接触させ、グリス潤滑にした。マグネット5の吸引力
は、700gがスラスト荷重として、スラスト軸受3にかか
る。シャフト1とラジアル軸受2とのクリアランスは10
μmにした。また、軸受長さを2mm,シャフト1とター
ンテーブル面4aとの直角度を5分以下に管理して組立
てた結果、ターンテーブルの面振れ2分以下、面倒れ2
分以下、高さのバラツキ0.1mm以下の性能が安定して得
られた。寿命については、面粗さ、表面硬度が関係し、
容易に設定できる。
The two planes, 5a and 6a, were in contact with each other with grease sandwiched therebetween, and were lubricated with grease. As for the attraction force of the magnet 5, 700 g is applied to the thrust bearing 3 as a thrust load. The clearance between shaft 1 and radial bearing 2 is 10
μm. Also, assembling with a bearing length of 2 mm and a perpendicularity between the shaft 1 and the turntable surface 4a of 5 minutes or less results in a turntable surface runout of 2 minutes or less and a surface fall of 2 minutes.
Within a minute, the performance with a height variation of 0.1 mm or less was stably obtained. The life is related to surface roughness and surface hardness.
Can be set easily.

【0024】このように、平面のリング面でスラスト荷
重を受け、平面ならいでロータが回転することにより、
軸受スパン,軸受クリアランス,直角度によらない軸受
装置を構成できる。
As described above, the thrust load is received on the flat ring surface, and the rotor rotates in the flat shape, whereby
A bearing device independent of bearing span, bearing clearance, and squareness can be configured.

【0025】シャフトと軸受のクリアランスが小さいと
従来の軸受構成のように、軸受スパンで振れ精度が決る
のでクリアランスは大きくするが、あまり大きいと軸振
れを悪くするので、限界はある。平面リング面でスラス
ト荷重を受けることにより荷重を受ける面積が大きくな
り良いのであるが、これは摩擦抵抗を増し(軸受ロスを
増やし)、回転が速くなるほど動作電流の増大、発熱、
摩耗の増大を招く。しかし本実施例では動圧を使用して
非接触としたので、摩擦抵抗が無くなった。
If the clearance between the shaft and the bearing is small, the clearance is increased because the runout accuracy is determined by the bearing span, as in the conventional bearing configuration. However, if the clearance is too large, the shaft runout is deteriorated, so there is a limit. By receiving a thrust load on the flat ring surface, the load receiving area increases, which is good, but this increases friction resistance (increases bearing loss), and the faster the rotation, the greater the operating current, heat generation,
This leads to increased wear. However, in this embodiment, the contact was made non-contact by using the dynamic pressure, so that the frictional resistance was lost.

【0026】また、前記コイル6とマグネット5間のリ
ング状対向面の少なくとも一方の面に、耐摩耗性のニッ
ケルメッキ等の表面処理を施すか、または耐摩耗性のガ
ラスまたはセラミック系等よりなる高硬度の薄いシート
を接着するか、または、前記高硬度の薄いシートを接着
した上に前記表面処理を施して構成したので、マグネッ
トの面にもコイルの面にも容易に高精度な表面処理が施
せた。この表面処理で表面硬度を上げ、面粗さをよくし
たので、圧痕が生じにくくなり、加工しやすい材料で
も、耐摩耗に効果があった。
Also, at least one of the ring-shaped facing surfaces between the coil 6 and the magnet 5 is subjected to a surface treatment such as wear-resistant nickel plating, or is made of a wear-resistant glass or ceramic material. A high-hardness thin sheet is bonded, or the high-hardness thin sheet is bonded and the surface treatment is applied, so that both the magnet surface and the coil surface can be easily subjected to high-precision surface treatment. Was given. Since the surface hardness was increased and the surface roughness was improved by this surface treatment, indentations were less likely to occur, and even a material that was easy to process was effective in abrasion resistance.

【0027】本実施例では、軸受長が振れに影響しなく
なった為に、これまで軸受長を確保する為に、圧入代を
短くしたり等していたが、圧入代が十分とれるようにな
り、機械的強度、耐衝撃性が向上した。
In this embodiment, since the bearing length has no influence on the run-out, the press-fit allowance has been shortened or the like in order to secure the bearing length. However, the press-fit allowance can be sufficiently obtained. And improved mechanical strength and impact resistance.

【0028】以上詳細に説明したように本発明の構成で
は、ロータ側・ステータ側の平面度,平行度のみで、タ
ーンテーブル面の振れ・倒れ精度がきまり、ラジアル軸
受はシャフトの位置を決めているだけで、振れ・倒れ精
度を維持する目的でのラジアル軸受は必要ないので、軸
受スパンは長いとかえって障害になり、薄型化に適した
構成といえる。
As described in detail above, in the configuration of the present invention, the runout / fall accuracy of the turntable surface is determined only by the flatness and parallelism on the rotor side and the stator side, and the radial bearing determines the position of the shaft. It is not necessary to provide a radial bearing for the purpose of maintaining the run-out / fall accuracy. Therefore, if the bearing span is long, it becomes an obstacle rather than the bearing span, and it can be said that the configuration is suitable for thinning.

【0029】最終的に必要なのは、取付けベースの取付
け面とターンテーブル面との平行度であるが、従来はス
テータ側直角度と、ロータ側直角度をきびしく管理し、
シャフト外径と軸受内径もきびしく管理し、直角度と径
を介して平行度を維持する工夫をしていたが、ロータ側
もステータ側も、本構成は平行度のみできまるので、管
理がやりやすい。またスラスト受けが面受けになったの
で、接触面積が大きくなり、衝撃等に対して、圧痕がつ
きにくく、市場信頼性が増す。
What is ultimately required is the parallelism between the mounting surface of the mounting base and the turntable surface. Conventionally, the perpendicularity on the stator side and the perpendicularity on the rotor side are strictly controlled.
Shaft outer diameter and bearing inner diameter were strictly controlled, and parallelism was maintained through squareness and diameter. Cheap. In addition, since the thrust receiver is a surface support, the contact area is increased, and indentations are less likely to be formed due to an impact or the like, thereby increasing market reliability.

【0030】[0030]

【発明の効果】本発明の請求項1による薄型軸受装置に
よると、実施例で詳細に説明したとおり、スラスト荷重
受けを従来からの点受けではなく面受けにし、更にディ
スク面の振れ・倒れの精度が軸受長やクリアランスによ
らないで、面平行度できまる構成にしたので、薄型化が
容易になり、接触面積の増加により、点受けで問題であ
った衝撃荷重による圧痕が原因の振動・異音が減少し、
振れ・倒れ・高さ寸法精度が向上した薄型高密度ディス
ク記憶装置用スピンドルモータに適した薄型軸受装置を
提供できる。
According to the thin bearing device according to the first aspect of the present invention, as described in detail in the embodiment, the thrust load receiver is not a conventional spot bearing but a surface bearing, and furthermore, the thrust load of the disk surface is reduced. The accuracy is not dependent on the bearing length or clearance, and the structure is designed to be parallel to the surface.Thus, it is easy to reduce the thickness and increase the contact area. Noise is reduced,
A thin bearing device suitable for a spindle motor for a thin, high-density disk storage device with improved runout, fall, and height dimensional accuracy can be provided.

【0031】また、本発明の請求項2による薄型軸受装
置によると、前記コイル6またはマグネット5のどちら
か一方のリング状の対向面6aまたは5aに動圧発生溝
を設け、回転時にコイル6とマグネット5の対向面が平
行隙間で非接触支持されるように構成したので、面接触
による摩擦も発生せず、シャフトのすりこぎ運動も、2
平面で発生する動圧により防止できるので、性能・強度
共に優れた薄型軸受装置を提供できる。
According to the thin bearing device of the second aspect of the present invention, a dynamic pressure generating groove is provided on one of the ring-shaped opposing surfaces 6a or 5a of the coil 6 or the magnet 5, so that the coil 6 and the coil 6 are rotated during rotation. Since the opposing surfaces of the magnets 5 are configured to be supported in a non-contact manner by the parallel gaps, friction due to surface contact does not occur, and the rubbing motion of the shaft is reduced by 2 mm.
Since it can be prevented by dynamic pressure generated on a flat surface, a thin bearing device excellent in both performance and strength can be provided.

【0032】また、本発明の請求項3記載の薄型軸受装
置によると、表面処理で表面硬度を上げ、平面度・面粗
さをよくしたので、圧痕が生じにくくなり、耐摩耗・長
寿命に優れた薄型軸受装置を提供できる。
According to the thin bearing device of the third aspect of the present invention, the surface hardness is increased by the surface treatment, and the flatness and the surface roughness are improved. An excellent thin bearing device can be provided.

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

【図1】本発明の実施例の薄型ディスクモータ用軸受装
置を説明する断面図。
FIG. 1 is a sectional view illustrating a bearing device for a thin disk motor according to an embodiment of the present invention.

【図2】従来の薄型ディスクモータ用軸受装置を説明す
る断面図。
FIG. 2 is a cross-sectional view illustrating a conventional thin disk motor bearing device.

【符号の説明】[Explanation of symbols]

1 シャフト 2 ラジアル軸受 3 スラスト軸受 4 ターンテーブル 5 マグネット 6 コイル 7 取付ベース 8 ブッシュ DESCRIPTION OF SYMBOLS 1 Shaft 2 Radial bearing 3 Thrust bearing 4 Turntable 5 Magnet 6 Coil 7 Mounting base 8 Bush

フロントページの続き (72)発明者 池田 久 東京都足立区新田3丁目8番22号 並木精 密宝石株式会社内Continuation of the front page (72) Inventor Hisashi Ikeda 3-8-22 Nitta, Adachi-ku, Tokyo Inside Namiki Seiki Co., Ltd.

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 ディスクを回転させる面対向型スピンド
ルモータに於て、ターンテーブル面の振れが、シャフト
と軸受のクリアランス、軸受長によらないで、ターンテ
ーブル面とマグネットのコイル側の面との平行度、マグ
ネットのコイル側の面の平面度、コイルのマグネット側
の面の平面度で決定され、ターンテーブル面の倒れが、
モータ取付け面とコイルのマグネット側の面との平行度
及びマグネットのコイル側の面とターンテーブル面との
平行度で決定されることを特徴とする薄型軸受装置。
In a surface-facing spindle motor for rotating a disk, the run-out of a turntable surface depends on the clearance between a shaft and a bearing and the length of a bearing. It is determined by the degree of parallelism, the flatness of the magnet on the coil side, and the flatness of the coil on the magnet side.
A thin bearing device, which is determined by the parallelism between the motor mounting surface and the surface of the coil on the magnet side and the parallelism between the surface of the magnet on the coil side and the turntable surface.
【請求項2】 前記コイルまたはマグネットのどちらか
一方のリング状の対向面に動圧発生溝を設け、回転時に
前記コイルとマグネットの対向面が平行隙間で非接触支
持されることを特徴とする請求項1記載の薄型軸受装
置。
2. A dynamic pressure generating groove is provided on one of the ring-shaped opposing surfaces of the coil and the magnet, and the opposing surfaces of the coil and the magnet are non-contact supported by a parallel gap during rotation. The thin bearing device according to claim 1.
【請求項3】 前記コイルとマグネット間のリング状対
向面の少なくとも一方の面に、耐摩耗性のニッケルメッ
キ等の表面処理を施すか、または耐摩耗性のガラスまた
はセラミック系等よりなる高硬度の薄いシートを接着す
るか、または、前記高硬度の薄いシートを接着した上に
前記表面処理を施したことを特徴とする請求項1または
2記載の薄型軸受装置。
3. A surface treatment such as wear-resistant nickel plating is applied to at least one of the ring-shaped facing surfaces between the coil and the magnet, or a high hardness made of a wear-resistant glass or ceramic material or the like. The thin bearing device according to claim 1, wherein the surface treatment is performed after bonding a thin sheet having a small thickness or bonding the thin sheet having a high hardness.
JP28292897A 1997-09-30 1997-09-30 Thin bearing equipment Withdrawn JPH11113210A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP28292897A JPH11113210A (en) 1997-09-30 1997-09-30 Thin bearing equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP28292897A JPH11113210A (en) 1997-09-30 1997-09-30 Thin bearing equipment

Publications (1)

Publication Number Publication Date
JPH11113210A true JPH11113210A (en) 1999-04-23

Family

ID=17658937

Family Applications (1)

Application Number Title Priority Date Filing Date
JP28292897A Withdrawn JPH11113210A (en) 1997-09-30 1997-09-30 Thin bearing equipment

Country Status (1)

Country Link
JP (1) JPH11113210A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7915774B2 (en) * 2007-09-17 2011-03-29 Lg Innotek Co., Ltd. Spindle motor

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7915774B2 (en) * 2007-09-17 2011-03-29 Lg Innotek Co., Ltd. Spindle motor
US8076806B2 (en) 2007-09-17 2011-12-13 Lg Innotek Co., Ltd. Spindle motor having bushing
US8089186B2 (en) 2007-09-17 2012-01-03 Lg Innotek Co., Ltd. Spindle motor having bushing

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