JPH0554162B2 - - Google Patents
Info
- Publication number
- JPH0554162B2 JPH0554162B2 JP62125913A JP12591387A JPH0554162B2 JP H0554162 B2 JPH0554162 B2 JP H0554162B2 JP 62125913 A JP62125913 A JP 62125913A JP 12591387 A JP12591387 A JP 12591387A JP H0554162 B2 JPH0554162 B2 JP H0554162B2
- Authority
- JP
- Japan
- Prior art keywords
- carriage
- amplifier
- support
- magnetic disk
- base member
- 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 - Lifetime
Links
- 230000007246 mechanism Effects 0.000 description 6
- 239000004020 conductor Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 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
- 230000006866 deterioration Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B33/00—Constructional parts, details or accessories not provided for in the other groups of this subclass
- G11B33/10—Indicating arrangements; Warning arrangements
-
- 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
-
- 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
Landscapes
- Moving Of Heads (AREA)
- Recording Or Reproducing By Magnetic Means (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は磁気デイスク装置に係り、特に高密度
磁気記録に好適な信号読み出し回路に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic disk device, and particularly to a signal readout circuit suitable for high-density magnetic recording.
高記録密度を要求される磁気デイスク装置では
ヘツドの位置決め精度及び塵埃の問題から、第１
図の様なHDA（ヘツド・デイスク・アセンブリ）
構成をとつている。さらに第１図では、システム
のスループツト向上のために２組の独立した位置
決め機構１及び２を有している。この様な構成の
装置では、一方が読み出し動作中に、他方がアク
セス動作を行なう場合が起こる。アクセス動作
は、永久磁石による磁界中に置かれたボイスコイ
ルに、電流を流すことにより行なわれる。この電
流は数Ａに達し、HDA内に強い電界を発生し、
読み出し動作中の位置決め機構の導体に誘導雑音
を発生させる。高密度磁気記録のためには、磁気
ヘツドより読み出される広帯域・微少信号の伝送
距離を短くするように、ヘツドキヤリア３に前置
増幅器４を統裁している。誘導雑音は、この前置
増幅器の動作にも影響を与える。ヘツドキヤリア
３は、高精度の位置決めを行なうために、その回
転軸６を中心として自由に滑らかに回転しなけれ
ばならないという制限を持つためにヘツドキヤリ
ア３とベースに結合された支持体５との間の結合
は、第１図ｂのように、可撓線７により成され、
ヘツドキヤリア３の自由な回転を妨げない構造と
していた。なお支持ベアリング部は潤滑油膜のた
めに電気的結合とはならない。第１図ｂの構成で
は、高周波における可撓線７のインピーダンスが
高く、読み出し動作中に他方がアクセス動作を行
なうと、誘導雑音のために読み出し信号誤り率が
悪化していた。
In magnetic disk devices that require high recording density, problems such as head positioning accuracy and dust have caused problems.
HDA (head disk assembly) as shown
The structure is in place. Further, in FIG. 1, two sets of independent positioning mechanisms 1 and 2 are provided to improve the throughput of the system. In devices with such a configuration, there are cases where one device is performing a read operation while the other device is performing an access operation. The access operation is performed by passing current through the voice coil placed in the magnetic field of the permanent magnet. This current reaches several amperes and generates a strong electric field within the HDA,
Inductive noise is generated in the conductor of the positioning mechanism during the read operation. For high-density magnetic recording, a preamplifier 4 is connected to the head carrier 3 so as to shorten the transmission distance of the broadband and minute signals read out from the magnetic head. Induced noise also affects the operation of this preamplifier. The head carrier 3 has a restriction that it must rotate freely and smoothly around its rotation axis 6 in order to perform high-precision positioning. The connection is made by a flexible wire 7, as shown in FIG. 1b,
The head carrier 3 had a structure that did not hinder the free rotation of the head carrier 3. Note that the support bearing part is not electrically connected due to the lubricating oil film. In the configuration shown in FIG. 1B, the impedance of the flexible wire 7 at high frequencies is high, and when one side performs an access operation during a read operation, the read signal error rate deteriorates due to induced noise.
本発明の目的は、前置増幅器の接地部と装置接
地部を低インピーダンスで結合することにより、
誘導雑音を抑えて、低い信号誤り率をもつ信号読
み出し回路を提供することにある。
The object of the present invention is to provide a low impedance coupling between the preamplifier ground and the device ground.
An object of the present invention is to provide a signal readout circuit that suppresses induced noise and has a low signal error rate.
HDA（ヘツド・デイスク・アセンブリ）内に２
組の独立した位置決め機構を有する構成の磁気デ
イスク装置において、一方が読み出し動作中に、
他方がアクセス動作を行なうと読み出し信号誤り
率が悪化するという問題が生じていた。この原因
が、前置増幅器の接地部と装置接地部間のインピ
ーダンスが高いため、他方の駆動コイルに流れる
電流により誘導雑音が発生するためであることを
発見し、接地部間のインピーダンスを下げること
を考えた。
2 in the HDA (Head Disk Assembly)
In a magnetic disk device configured to have two sets of independent positioning mechanisms, one of the sets may be used during a read operation.
A problem has arisen in that when the other side performs an access operation, the read signal error rate worsens. It was discovered that the cause of this was that the impedance between the preamplifier grounding part and the equipment grounding part was high, which caused inductive noise due to the current flowing to the other drive coil, and the team lowered the impedance between the grounding parts. I thought about it.
以下、本発明の一実施例を第２図により説明す
る。前置増幅器４は可動体６に取り付けられ、可
動体６の回転中心軸上に取り付けられた導体板９
と、支持体に取り付けられた導体板９の間を、可
撓線８で結合している。可動体６の回転角は最大
15度程度なので、可撓線８の曲率半径の変化は小
さく、ヘツドキヤリツジに加わる外力トルクを小
さくし、自由な回転を保障しながら全長を短かく
することができる。
An embodiment of the present invention will be described below with reference to FIG. The preamplifier 4 is attached to a movable body 6, and a conductor plate 9 is attached to the central axis of rotation of the movable body 6.
and a conductor plate 9 attached to the support body are connected by a flexible wire 8. The rotation angle of movable body 6 is maximum
Since the radius of curvature of the flexible wire 8 is approximately 15 degrees, the change in the radius of curvature of the flexible wire 8 is small, and the external force torque applied to the head carriage can be reduced, and the overall length can be shortened while ensuring free rotation.
本実施例によれば、可動体接地部と支持体接地
部との間のインピーダンスを、第１図ｂの従来方
式に比べて、第３図の様に小さくできた。その結
果、読み出し動作中に、他方の位置決め機構がア
クセス動作を行なつた場合に生じていた、誘導雑
音によると考えられる信号誤り率の悪化が抑えら
れた。 According to this embodiment, the impedance between the movable body grounding part and the support grounding part can be made smaller as shown in FIG. 3, compared to the conventional system shown in FIG. 1b. As a result, the deterioration of the signal error rate, which would have occurred if the other positioning mechanism performed an access operation during the read operation, was suppressed, which would have been caused by induced noise.
本発明によれば、接地系のインピーダンス低下
により、他からの誘導雑音を抑えられるので、信
号誤り率を減少させる効果がある。
According to the present invention, by reducing the impedance of the grounding system, induced noise from other sources can be suppressed, which has the effect of reducing the signal error rate.
第１図ａはHDA外観図、第１図ｂは位置決め
機構の断面図、第２図ａは本発明の適用部の拡大
図で、第２図ｂは第２図ａを上方より見た平面
図、第３図は接地線の周波数に対するインピーダ
ンスを示すグラフである。
１，２……位置決め機構、３……ヘツドキヤリ
ツジ、４……前置増幅器、５……支持体、６……
回転軸、７……可撓線、８……可撓体。
Fig. 1a is an external view of the HDA, Fig. 1b is a sectional view of the positioning mechanism, Fig. 2a is an enlarged view of the applied part of the present invention, and Fig. 2b is a plan view of Fig. 2a from above. FIG. 3 is a graph showing the impedance of the ground line versus frequency. 1, 2...Positioning mechanism, 3...Head carriage, 4...Preamplifier, 5...Support, 6...
Rotating shaft, 7...flexible wire, 8...flexible body.
Claims (1)
れる支持体と、 磁気デイスクに情報を記録／再生する磁気ヘツ
ドと、 該磁気ヘツドを上記磁気デイスク上に位置決め
するキヤリツジと、 該キヤリツジ上に固定され、上記磁気ヘツドよ
り再生された信号を増幅する増幅器と、 上記キヤリツジを揺動可能なように上記支持体
に固定するベアリングと、 上記キヤリツジと上記支持体を電気的に接続す
る可撓性部材を有し、 上記増幅器を上記キヤリツジに接地することに
よつて、前記増幅器の接地と前記ベース部材を電
気的に結合することを特徴とする磁気デイスク装
置。[Claims] 1: a base member; a support member fixed to the base member in an electrically conductive manner; a magnetic head for recording/reproducing information on a magnetic disk; and a magnetic head mounted on the magnetic disk. a carriage for positioning; an amplifier fixed on the carriage for amplifying a signal reproduced from the magnetic head; a bearing for swingably fixing the carriage to the support; the carriage and the support. What is claimed is: 1. A magnetic disk device comprising: a flexible member for electrically connecting the amplifier; and by grounding the amplifier to the carriage, the ground of the amplifier is electrically coupled to the base member.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12591387A JPS62283403A (en) | 1987-05-25 | 1987-05-25 | Magnetic disk device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12591387A JPS62283403A (en) | 1987-05-25 | 1987-05-25 | Magnetic disk device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62283403A JPS62283403A (en) | 1987-12-09 |
| JPH0554162B2 true JPH0554162B2 (en) | 1993-08-11 |
Family
ID=14922021
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12591387A Granted JPS62283403A (en) | 1987-05-25 | 1987-05-25 | Magnetic disk device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62283403A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09139063A (en) * | 1995-11-10 | 1997-05-27 | Nec Corp | Fall-off preventive insulator |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59168968A (en) * | 1983-03-17 | 1984-09-22 | Fujitsu Ltd | Magnetic storage device |
-
1987
- 1987-05-25 JP JP12591387A patent/JPS62283403A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59168968A (en) * | 1983-03-17 | 1984-09-22 | Fujitsu Ltd | Magnetic storage device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09139063A (en) * | 1995-11-10 | 1997-05-27 | Nec Corp | Fall-off preventive insulator |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62283403A (en) | 1987-12-09 |
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