JPS581858A - Magnetic disk device - Google Patents

Magnetic disk device

Info

Publication number
JPS581858A
JPS581858A JP9855981A JP9855981A JPS581858A JP S581858 A JPS581858 A JP S581858A JP 9855981 A JP9855981 A JP 9855981A JP 9855981 A JP9855981 A JP 9855981A JP S581858 A JPS581858 A JP S581858A
Authority
JP
Japan
Prior art keywords
magnetic
magnetic disk
magnetic head
head
motor
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
Application number
JP9855981A
Other languages
Japanese (ja)
Other versions
JPS6259389B2 (en
Inventor
Isokichi Inazu
稲津　五十吉
Masaru Zenitani
銭谷　優
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP9855981A priority Critical patent/JPS581858A/en
Publication of JPS581858A publication Critical patent/JPS581858A/en
Publication of JPS6259389B2 publication Critical patent/JPS6259389B2/ja
Granted 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

Landscapes

  • Rotational Drive Of Disk (AREA)

Abstract

PURPOSE:To prevent the overload of a motor caused by the adhesion between a magnetic disk and a magnetic head and the damage of the disk and the head with a simple constitution, by applying the minute vibration to the magnetic head when the magnetic disk starts its rotation. CONSTITUTION:At starting, an irregular signal is first fed to a servo motor 4 from an irregular signal generator 7 through a switch 8. Thus the motor 4 has a frequency and a vibration changing its amplitude irregularly, and this frequency or vibration is transmitted to a magnetic head 1 via an arm 3. As a result, the adhesion is released between the head 1 and a magnetic disk 2, and the load current of the motor 4 decreases suddenly. This sudden decrease of the load current is detected by a sensor 10 to change the switch 8, and the signal of the generator 7 is cut off. Then the positioning signal A of magnetic head is connected to a servo amplifier 9. At the same time, a rotary motor 5 is started and a magnetic disk device has a normal operation.

Description

【発明の詳細な説明】 本発明は磁気円板と磁気ヘッドとの固着による磁気円Ｍ
ａ転モータの過負荷ならび忙磁気円榎および磁気ヘラｙ
の損傷を防止し九磁気ディスク装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention provides a magnetic circle M by fixing a magnetic disk and a magnetic head.
Overload of A-rotation motor and busy magnetic circle and magnetic spatula y
9. Preventing damage to magnetic disk devices.

磁気ディスクｗａＴ／Ｃシいては高速回転する磁気円板
とこれに’！ａ＋ふ磁気ヘット０との間の隙間冬一定に
保つために、これらの間の流体力学的作用によって磁気
ヘッｒＫ生ず石揚力に！目し、この揚力をばね等忙よふ
押付力と平衡させる方法が広く用いられている◎そして
近時、′ａ磁気ディスク装置大容量化、高速化及び小鳳
化に伴って記録密度増大の要求が高ｔり、これに対魁す
るため磁気ヘッドの押付力を大自くすることによって磁
気円板と磁気ヘッドとの間の隙間を小さくす為ようｋな
うた０例えば磁気円板の線速度が３９ｍ／ｓのとき磁気
円板と磁気ヘッドとの間の隙間を１ｆｉに保つために６
ｇの押付力を与えてい為。磁気ヘッド面の面積を３ｍ”
とすゐと、この押付力は単位面積蟲〕では２００ｇ／ｉ
−にも遺すゐ。これに加えて磁気円板と磁気ヘッドの面
はいずれも鏡面仕上げが施され石ように危った。これら
のためコンタクト・スタート・ストップ（０８ｇ）方式
の磁気ディスク装置においては磁気円板が磁気ヘッドと
接し九ｔ〜長時間停止しているとき、これらの間にいわ
ゆる吸着現象が生じ、このために磁気円板と磁気ヘッド
が固着し、これが磁気ディスク装置の起動を困１１１Ｋ
した塾、あ為いは磁気円板及び磁気ヘッドを損傷させ為
主要な原因となっていゐ◎これ會〒、このような問題を
解決すｂための手段を備ん罠−気ディスク装置が各種提
案されているが多くは構造が複雛であ夛、シたがって高
価でありオた信頼性に欠けるという欠点があった◎本発
明はこのような現状に対してなされたものであ夛、その
目的とするところは構造が簡単で安価であり且つまた信
頼性の高い手段によって磁気円板と磁気ヘッドの固着を
解除できる磁気ディスク装置を提供すゐととにあゐ。The magnetic disk waT/C is a magnetic disc that rotates at high speed and this! In order to keep the gap between a + f and magnetic head 0 constant, the hydrodynamic action between them creates magnetic head rK and creates a stone lifting force! Therefore, a method of balancing this lifting force with the pressing force of a spring or the like is widely used.In recent years, with the increase in capacity, speed, and miniaturization of magnetic disk devices, the recording density has increased. In order to meet this demand, the pressing force of the magnetic head is increased to reduce the gap between the magnetic disk and the magnetic head. 6 to maintain the gap between the magnetic disk and the magnetic head at 1fi when the speed is 39m/s.
This is because a pressing force of g is applied. The area of the magnetic head surface is 3m"
This pressing force is 200g/i in unit area
I'll also leave it to you. In addition to this, the surfaces of the magnetic disk and magnetic head were both mirror-finished, making them look like stones. For these reasons, in contact start/stop (08g) type magnetic disk drives, when the magnetic disk is in contact with the magnetic head and stopped for a long period of time, a so-called attraction phenomenon occurs between them. The magnetic disk and magnetic head are stuck together, making it difficult to start up the magnetic disk device.
This is a major cause of damage to the magnetic disc and magnetic head.This meeting has a means to solve such problems. Although many of them have been proposed, they have the drawbacks of being complex, expensive, and lacking in reliability.The present invention was made in response to this current situation. The object is to provide a magnetic disk device that is simple in structure, inexpensive, and capable of releasing the adhesion between a magnetic disk and a magnetic head using highly reliable means.

上記の目的を達成するため、本発明においては、磁気ヘ
ッドを接触させたｔ〜磁気円板の回転の起動及び停止を
おこなう磁気ディスク装置において、周波数及びあるい
は振幅が不規則に変化する振動を磁気ヘッドに与え、磁
気円板と磁気ヘット°との固着を解除したのち磁気円板
の回転を起動するようにしたものである〇 以下、本発明の実施例を図面によって説明する◎第１図
において１は磁気ヘッド、２は磁気円板、３は診記の磁
気ヘッド１を保持するとともに、これを磁気円１１ｉ２
に押付け、磁気円！！２の回転によって磁気ヘッド１に
生ず為揚力と平衡させるに必要な弾性力を備えたアーム
、４はアーム３を介して磁気へラド１を磁気円Ｍ２の半
径方向に位置制御するサーボ・モータ、５は磁気円板２
を回転させる回転モータ、６はサーボ・モータ４及び回
転モータ５を制御する制御回路である。！１ｌＥ１図に
おいて本発明の要部は主としてサーボ・モータ４及び制
御回路６の一部が関連してｂる・第２図は前記関連部の
プａツク図であり、７は後記ナーｌ系を介し、周波数及
びあるいは振幅が不規則に変化する振動を磁気へラドに
与えるための信号を得る不規則信号発生器、畠は螢記セ
ｙすの検出信号に応じて不規則信号発生１！７の発生す
ゐ信号と磁気ヘッド位曾決め信号Ａの切替えをおこなう
スイッチ、９はサーボ・モータ４とともＫｆ−ボ系を形
放し、制御ＩＩ信号を増幅するサーボ・アンプ、１０け
サーボモータ４の負荷電流を検出するセンナである。以
上のような構ｆＫ訃いて、けじめ、スイッチ８Ｆｉ磁気
ヘッド位響決め信号Ａを断とし不規則信号発生器７が発
生すゐ信号を受は入れ石ようにたってかり、磁気へνｙ
１と磁気円Ｍ２の固着の解除及び磁気ディスク装置の起
動は次のようにしておこなわれる。不規則信号発生器７
が発生すゐ不規則信号はサーボ・アンプ９で増幅されサ
ーボ・モータ４に与えられる◎このためサーボ・モータ
４は周波数及びあるいは振幅が不規則に変化する振動を
生じ、これをアーム３を介し磁気ヘッドＩＫ伝える・そ
の結果、Ｉ１１気へラド１と磁気円［２の固着が解除で
れるとサーボ・モータ４の負荷電流が急激に減少する。In order to achieve the above object, in the present invention, in a magnetic disk device that starts and stops the rotation of a magnetic disk in contact with a magnetic head, vibrations that irregularly change in frequency and/or amplitude are magnetically suppressed. The magnetic disk is applied to the head to start rotating the magnetic disk after releasing the fixation between the magnetic disk and the magnetic head. 〇Hereafter, embodiments of the present invention will be explained with reference to the drawings. ◎In Fig. 1 1 is a magnetic head, 2 is a magnetic disk, and 3 holds the magnetic head 1 for medical records, and also connects it to a magnetic circle 11i2.
Press on the magnetic circle! ! An arm having an elastic force necessary to balance the lift generated on the magnetic head 1 by the rotation of 2, and a servo motor 4 that controls the position of the magnetic head 1 in the radial direction of the magnetic circle M2 via the arm 3. , 5 is the magnetic disk 2
A rotary motor 6 rotates the servo motor 4 and a control circuit 6 that controls the servo motor 4 and the rotary motor 5. ! In Fig. 1E1, the main parts of the present invention mainly include the servo motor 4 and a part of the control circuit 6. Fig. 2 is a block diagram of the related parts, and 7 shows the inner system described later. An irregular signal generator that obtains a signal for giving a vibration whose frequency and/or amplitude irregularly changes to the magnetic helad, and generates an irregular signal in response to the detection signal of the 9 is a switch for switching between the generated signal A and the magnetic head positioning signal A, 9 is a servo amplifier that disconnects the Kf-vo system from the servo motor 4 and amplifies the control II signal, and 10 servo motors 4 This is a sensor that detects the load current. With the above structure, the switch 8Fi cuts off the magnetic head positioning signal A and receives the signal generated by the irregular signal generator 7.
The release of the fixation between the magnetic circle M2 and the magnetic circle M2 and the activation of the magnetic disk device are performed as follows. Irregular signal generator 7
The irregular signal generated is amplified by the servo amplifier 9 and given to the servo motor 4 ◎As a result, the servo motor 4 generates vibrations whose frequency and/or amplitude changes irregularly, which is transmitted via the arm 3. As a result, the load current of the servo motor 4 decreases rapidly when the magnetic head IK is released from the magnetic circle [2].

センナ１０がこれを検知すゐと、スイッチ８の切替えが
おこなわれ、不規則信号発生器７の信号を断とし、磁気
ヘッド位置決め信号Ａをサーボ・アンプ９に警続すると
と−Ｋｎ転’！−１５の回転を起動し、以下、磁気ディ
スク装置の正常な動作に移る◎不規則信号発生器テに発
生させ為信号は、磁気ディスク＊＠によって異なり、Ｉ
Ｉ’ｌｌｌした磁気ヘッドに必要以上の無１１カ力が生
じかいように、はじめ弱く次第に強くｆｋ、！＋ように
、サーボ・アンプ９及びサーボ拳そ−タ４をふくむナー
ゼ系ならびにアーム３の動的特性を考慮しながら実験的
忙決定する◎また機構部各部の共振によゐ破損を避けゐ
ため特定の周波数を除くべきは勿論である０このよう和
して、磁気ヘッド１を磁気円板２の半径方向に振動させ
るとき、同時にアーム３と磁気へラド１の連接点付近を
通〕磁気円板２に平行で且つ磁気円板２の半径方向と直
交する直線（館ＩＷにおいて紙面に垂直方向）を軸とす
ゐ回転振動が磁気へラド１に与えられるので、磁気へラ
ド１と磁気円板２の固着を解除すゐ上で有効に作吊すゐ
。When the sensor 10 detects this, the switch 8 is switched, the signal from the irregular signal generator 7 is cut off, and the magnetic head positioning signal A is sent to the servo amplifier 9, causing a -Kn turn! ◎The irregular signal generator TE generates a signal that differs depending on the magnetic disk*@,
As if more force than necessary is being generated in the magnetic head, it starts weakly and then gradually becomes stronger fk! As shown in Figure 3, the dynamic characteristics of the servo amplifier 9 and servo fist controller 4 as well as the arm 3 are taken into account when making experimental decisions.Also, in order to avoid damage due to resonance in each part of the mechanism. It goes without saying that certain frequencies should be excluded.By adding up in this way, when the magnetic head 1 is vibrated in the radial direction of the magnetic disk 2, the magnetic circle passing through the vicinity of the connection point between the arm 3 and the magnetic disk 1 at the same time Since rotational vibration is applied to the magnetic helad 1 about a straight line parallel to the plate 2 and orthogonal to the radial direction of the magnetic disk 2 (perpendicular to the paper surface in IW), the magnetic helad 1 and the magnetic circle Release the fixation of board 2 and hang the work effectively on the board.

以上説明したように本発明和よれば磁気円板と磁気ヘッ
ドの同着を安全且つ容易に解除することが可能であり、
したがってまた磁気ディスク装置の起動を容馬とし、ま
た磁気ヘッド中磁気ディスクを破損させゐことがない。As explained above, according to the present invention, it is possible to safely and easily release the cohesion of the magnetic disk and the magnetic head.
Therefore, the startup of the magnetic disk device is made easier, and the magnetic disk in the magnetic head is not damaged.

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

第１図は本発明実施例の構成図、第２図は同じくその要
部のプｗｖタ図であり、１は磁気ヘッド、２は磁気円板
、３はアーム、４はサーボ・モータ、Ｓは回転モータ、
６は制御回路、７け不規則信号発生器、８けスイッチ、
９は号−ボ・アンプ、１０はセンナである口FIG. 1 is a configuration diagram of an embodiment of the present invention, and FIG. 2 is a diagram of the main parts thereof, in which 1 is a magnetic head, 2 is a magnetic disk, 3 is an arm, 4 is a servo motor, and S is a rotating motor,
6 is a control circuit, 7-digit irregular signal generator, 8-digit switch,
9 is the number - bo amp, 10 is the mouth that is senna

Claims (1)

【特許請求の範囲】[Claims] １、磁気円板の回転開始時及び停止時に磁気ヘッドが磁
気円板上を摺動するコンタクトスタートストップ方式の
磁気ヘッドを採用した磁気ディスク装置において、上記
磁気円板の回転開始時に該磁気ヘッドを微少振動させる
事を特徴とす為磁気ディスク装置。1. In a magnetic disk drive employing a contact start/stop type magnetic head in which the magnetic head slides on the magnetic disk when the magnetic disk starts and stops rotating, the magnetic head slides when the magnetic disk starts rotating. A magnetic disk device that is characterized by minute vibrations.
JP9855981A 1981-06-25 1981-06-25 Magnetic disk device Granted JPS581858A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9855981A JPS581858A (en) 1981-06-25 1981-06-25 Magnetic disk device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9855981A JPS581858A (en) 1981-06-25 1981-06-25 Magnetic disk device

Publications (2)

Publication Number Publication Date
JPS581858A true JPS581858A (en) 1983-01-07
JPS6259389B2 JPS6259389B2 (en) 1987-12-10

Family

ID=14223038

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9855981A Granted JPS581858A (en) 1981-06-25 1981-06-25 Magnetic disk device

Country Status (1)

Country Link
JP (1) JPS581858A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0110006A1 (en) * 1982-11-26 1984-06-13 International Business Machines Corporation Apparatus and method for releasing the magnetic head in a magnetic disk file
JPS59177762A (en) * 1983-03-28 1984-10-08 Fujitsu Ltd Magnetic disc device
US4589036A (en) * 1984-12-03 1986-05-13 International Business Machines Corporation Apparatus and method for instrumented radial translation of a read/write transducer at start-up of a rotating disk file
JPS6366780A (en) * 1986-09-08 1988-03-25 Fujitsu Ltd Attraction release method for magnetic disk device
US4833550A (en) * 1986-06-30 1989-05-23 Kabushiki Kaisha Toshiba Magnetic disk device having a mechanism for removing an adhesion between a magnetic head and a magnetic disk
US4907106A (en) * 1987-01-19 1990-03-06 Nec Corporation Head slider driving mechanism for a magnetic disk apparatus
US5530602A (en) * 1993-06-29 1996-06-25 International Business Machines Corporation Disk drive micromotion starting apparatus and method
US6154340A (en) * 1996-11-22 2000-11-28 Seagate Technology, Inc. Low velocity disk drive load controller

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55108964A (en) * 1979-02-13 1980-08-21 Nec Corp Magnetic disc device

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55108964A (en) * 1979-02-13 1980-08-21 Nec Corp Magnetic disc device

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0110006A1 (en) * 1982-11-26 1984-06-13 International Business Machines Corporation Apparatus and method for releasing the magnetic head in a magnetic disk file
JPS59177762A (en) * 1983-03-28 1984-10-08 Fujitsu Ltd Magnetic disc device
JPH0421950B2 (en) * 1983-03-28 1992-04-14 Fujitsu Ltd
US4589036A (en) * 1984-12-03 1986-05-13 International Business Machines Corporation Apparatus and method for instrumented radial translation of a read/write transducer at start-up of a rotating disk file
EP0184387A2 (en) * 1984-12-03 1986-06-11 International Business Machines Corporation A method of controlling the operation of a disk file and a disk file
JPS61134975A (en) * 1984-12-03 1986-06-23 インタ−ナショナル　ビジネス　マシ−ンズ　コ−ポレ−ション Rotary starting of disc
US4833550A (en) * 1986-06-30 1989-05-23 Kabushiki Kaisha Toshiba Magnetic disk device having a mechanism for removing an adhesion between a magnetic head and a magnetic disk
JPS6366780A (en) * 1986-09-08 1988-03-25 Fujitsu Ltd Attraction release method for magnetic disk device
US4907106A (en) * 1987-01-19 1990-03-06 Nec Corporation Head slider driving mechanism for a magnetic disk apparatus
US5530602A (en) * 1993-06-29 1996-06-25 International Business Machines Corporation Disk drive micromotion starting apparatus and method
US6154340A (en) * 1996-11-22 2000-11-28 Seagate Technology, Inc. Low velocity disk drive load controller

Also Published As

Publication number Publication date
JPS6259389B2 (en) 1987-12-10

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