JPS63149886A - Resetting circuit for actuator to specified position - Google Patents

Resetting circuit for actuator to specified position

Info

Publication number
JPS63149886A
JPS63149886A JP29593186A JP29593186A JPS63149886A JP S63149886 A JPS63149886 A JP S63149886A JP 29593186 A JP29593186 A JP 29593186A JP 29593186 A JP29593186 A JP 29593186A JP S63149886 A JPS63149886 A JP S63149886A
Authority
JP
Japan
Prior art keywords
actuator
circuit
spindle motor
power
relay
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.)
Pending
Application number
JP29593186A
Other languages
Japanese (ja)
Inventor
Doshu Suzuki
鈴木 道秋
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.)
NEC Corp
Original Assignee
NEC Corp
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 NEC Corp filed Critical NEC Corp
Priority to JP29593186A priority Critical patent/JPS63149886A/en
Publication of JPS63149886A publication Critical patent/JPS63149886A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To require no large capacity capacitor and to reset efficiently and correctly a magnetic head to a landing zone by operating an actuator by the use of the counter electromotive force of a spindle motor at the time of interrupting a power source. CONSTITUTION:A relay control circuit 5 detecting the one of the power source switches relay circuits 3, 6 to a side and rotates the spindle motor 1 through a spindle motor driving circuit 2. Thereby, a magnetic head is floated in the landing zone on a disk and seeks between cylinders by the actuator 7 driven by the output of an actuator driving circuit 8. When the power source is interrupted, the control circuit 5 switches the circuits 3, 6 to b side and the motor is changed to a rotating state to a stopping state. At that time, the counter electromotive force is produced in a coil, inputted to a rectifying circuit 4 through the circuit 3 and the rectified output moves the actuator 7 to the landing zone of the head through the circuit 6.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、アクチュエータ定位置復帰回路に関し、特に
磁気ディスク装置のアクチュエータ定位置復帰回路に関
する。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an actuator home position return circuit, and particularly to an actuator home position return circuit for a magnetic disk device.

〔従来の技術〕[Conventional technology]

従来、この種の磁気ディスク装置は、電源オン状態にな
ると、磁気ディスクを回転させるために、スピンドルモ
ータを回転させる。スピンドルモータの回転にともなっ
て、磁気ヘッドは、磁気ディスク上のランディングゾー
ン内で浮上する。浮上した磁気ヘッドは、シリンダ間を
アクチュエータによってシーク動作を行なう。電源オフ
状態または電源遮断状態になると再び電源オン状態で磁
気ヘッドがライディングゾーンで浮上できるように、磁
気ヘッドを速やかに、ランディングゾーンに戻す。この
ときアクチュエータは電源オフ状態または電源遮断状態
と同時にランディングゾーン方向に移動する。
Conventionally, this type of magnetic disk device rotates a spindle motor to rotate the magnetic disk when the power is turned on. As the spindle motor rotates, the magnetic head flies within a landing zone above the magnetic disk. The floating magnetic head performs a seek operation between cylinders by an actuator. When the power is turned off or cut off, the magnetic head is promptly returned to the landing zone so that the magnetic head can fly in the riding zone when the power is turned on again. At this time, the actuator moves toward the landing zone simultaneously with the power off state or power cutoff state.

電源オフ時または電源遮断時に磁気ヘッドを磁気ディス
ク上のランディングゾーンに戻す従来の技術としては、
予め、アクチュエータにバネなどの外力によって、ラン
ディングゾーン方向に外力を加えておき、電源オフ時ま
たは、電源遮断時にバネの外力でランディングゾーンに
戻す方式や、駆動時に予め大容量のコンデンサに電圧を
充電しておき、電源オフ時または電源遮断時にコンデン
サに光道した電圧によって磁気ヘッドをランディングゾ
ーンに戻す方式とがある。
Conventional technology for returning the magnetic head to the landing zone on the magnetic disk when the power is turned off or interrupted is as follows:
There is a method in which an external force is applied to the actuator in advance in the direction of the landing zone using an external force such as a spring, and the external force of the spring is used to return the actuator to the landing zone when the power is turned off or the power is cut off, or a voltage is charged to a large capacitor in advance during operation. There is a method in which the magnetic head is returned to the landing zone using a voltage that passes through the capacitor when the power is turned off or cut off.

予めランディングゾーン方向に外力を加えておく方式は
、前記外力によって、シーク時にシータ方向によってシ
ークタイムが違ったり、シータ方向によっては過渡応答
が悪くなったシする欠点がある。また大容量のコンデン
サに電圧を充電しておく方式は大型の大容量コンデンサ
を必要とする欠点がある。
The method of applying an external force in the direction of the landing zone in advance has the disadvantage that the external force causes seek time to vary depending on the theta direction during seek, and transient response worsens depending on the theta direction. Furthermore, the method of charging a voltage to a large-capacity capacitor has the drawback of requiring a large-sized, large-capacity capacitor.

〔発明が解決しようとする問題点〕 本発明が解決しようとする問題点は、上述した従来のア
クチュエータ定位置復帰機構の有する欠点を除去して、
電源オフ時または電源遮断時K。
[Problems to be Solved by the Invention] The problems to be solved by the present invention are as follows:
K when the power is off or cut off.

スピンドルモータを発電機として使用し、スピンドルモ
ータの定常回転状態から停止状態に移るときに生じる逆
起電圧を用いて、アクチュエータを動かすことによって
、バネなどの外力の影響がなく、大型の大容量コンデン
サを必要とせずに、効率良く、正確に磁気ヘッドをラン
ディングゾー/に戻すアクチュエータ定位置復帰回路を
提供することにある。
By using the spindle motor as a generator and moving the actuator using the back electromotive force generated when the spindle motor changes from a steady rotation state to a stopped state, there is no influence from external forces such as springs, and large, large capacitors can be used. An object of the present invention is to provide an actuator home position return circuit that efficiently and accurately returns a magnetic head to a landing zone without the need for.

〔問題点を解決するだめの手段〕[Failure to solve the problem]

本発明のアクチュエータ定位ff1ffl帰回路は、磁
気ディスクを回転させるためのスピンドルモータと、前
記スピンドルモータを、駆動するためのスピンドルモー
タ駆動回路と、電源オフ時または電源遮断時に前記スピ
ンドルモータを発電機として1更用シ、前記スピンドル
モータの定常回転状態から停止状態に移るときに生じる
逆起電圧を整流するための整流回路と、磁気ヘッド′を
目標位置に移動させるアクチュエータと、前記アクチュ
エータを駆動するためのアクチュエータ駆動回路と、電
源オフ時まだは電源遮断時に、前記スピンドルモータの
逆起電圧を前記整流回路に流すように切り換える第一の
リレー回路と電源オフ時または電源遮断時に、前記アク
チュエータの入力信号を前記アクチュエータ駆動回路の
出力信号から前記整流回路の出力信号に切り換える第2
のリレー回路と、電源の状態を検出し前記第1のリレー
回路と前記第2のリレー回路とを制御するリレー制御回
路とを備えて構成される。
The actuator localization ff1ffl return circuit of the present invention includes a spindle motor for rotating a magnetic disk, a spindle motor drive circuit for driving the spindle motor, and a spindle motor that operates as a generator when the power is turned off or cut off. 1. A rectifier circuit for rectifying a back electromotive voltage generated when the spindle motor shifts from a steady rotation state to a stopped state, an actuator for moving the magnetic head' to a target position, and for driving the actuator. an actuator drive circuit, a first relay circuit that switches the back electromotive voltage of the spindle motor to flow to the rectifier circuit when the power is off or when the power is cut off, and an input signal for the actuator when the power is turned off or cut off. a second switch for switching from the output signal of the actuator drive circuit to the output signal of the rectifier circuit;
and a relay control circuit that detects the state of the power supply and controls the first relay circuit and the second relay circuit.

〔実施例〕〔Example〕

次に本発明について図面を参照して説明する。 Next, the present invention will be explained with reference to the drawings.

第1図は本発明の一実施例のアクチュエータ定位置復帰
回路のブロック図である。本実施例は、磁気ディスクを
回転させるだめのスピンドルモータ1とスピンドルモー
タ1を駆動するためのスピンドルモータ駆動回路2と電
源オフ時または電源遮断時に、スピンドルモータ1を発
電機として使用し、スピンドルモータ1の定常回転状態
から停止状態に移るときに生じる逆起電圧を整流するた
めの整流回路4と磁気ヘッドをシリンダ間で移動させる
アクチュエータ7と、アクチュエータ7を駆動するため
のアクチュエータ駆動回路8と電源オフ時または電源遮
断時にスピンドルモータ1の逆起電圧を整流回路4に流
すように切り換えるリレー回路3と電源オフ時または電
源遮断時にアクチュエータの入力信号をアクチュエータ
駆動回路8の出力信号から整流回路4の出力信号に切り
換えるリレー回路6と電源状態を検出しリレー回路3.
6を制御するリレー制御回路5とから構成されている。
FIG. 1 is a block diagram of an actuator home position return circuit according to an embodiment of the present invention. This embodiment uses a spindle motor 1 for rotating a magnetic disk, a spindle motor drive circuit 2 for driving the spindle motor 1, and a spindle motor 1 that is used as a generator when the power is turned off or cut off. A rectifying circuit 4 for rectifying the back electromotive force generated when moving from a steady rotation state to a stopped state, an actuator 7 for moving the magnetic head between cylinders, an actuator drive circuit 8 for driving the actuator 7, and a power source. A relay circuit 3 switches the back electromotive voltage of the spindle motor 1 to flow to the rectifier circuit 4 when the power is off or the power is cut off, and a relay circuit 3 switches the actuator input signal from the output signal of the actuator drive circuit 8 to the rectifier circuit 4 when the power is off or the power is cut off. A relay circuit 6 that switches to an output signal and a relay circuit 3 that detects the power state.
and a relay control circuit 5 that controls the relay control circuit 6.

次に動作について説明する。電源オン状態になると、リ
レー制御回路5は電源オン状態になったことを検出し、
リレー回路3及びリレー回路6をa側に切り換える。ま
だ、電源オン状態になると磁気ディスクを回転させるた
めに、スピンドルモ−タ駆動回路2は駆動信号を出力し
、スピンドルモータ1を回転させる。スピンドルモータ
1の回転にともなって磁気ディスクが回転し、磁気ヘッ
ドは、磁気ディスク上のランディングゾーンで浮上する
。浮上後の磁気ヘッドはアクチュエータ駆動回路8の駆
動信号を受は取ったアクチュエータフによってシリンダ
間をシーク動作する。
Next, the operation will be explained. When the power is turned on, the relay control circuit 5 detects that the power is turned on,
Switch the relay circuit 3 and relay circuit 6 to the a side. When the power is turned on, the spindle motor drive circuit 2 outputs a drive signal to rotate the spindle motor 1 in order to rotate the magnetic disk. As the spindle motor 1 rotates, the magnetic disk rotates, and the magnetic head flies in a landing zone above the magnetic disk. After floating, the magnetic head performs a seek operation between cylinders by an actuator that receives a drive signal from an actuator drive circuit 8.

電源オフ状態または電源遮断状態になるとリレー制御回
路5は電源オフ状態または電源遮断状態になったことを
検出し、リレー回路3及びリレー回路6をb側に切り換
える。また、電源オフ状態または電源遮断状態になると
、スピンドルモータエは定常回転状態から停止状態に移
る。このときスピンドルモータ1は発電機として働き、
スピンドルモータ1のコイルに逆起電圧を生じる。逆起
電圧はリレー回路3を通って、整流回路4に入力される
。入力された逆起電圧は整流回路4で整流され、リレー
回路6を通ってアクチュエータフに入力される。整流回
路4からの出力信号によってアクチュエータ7は、磁気
ヘッドのツ/ディングゾーン方向に速やかに移動し、磁
気ヘッドを正確に、効率良く、ランディングゾーンに戻
す。
When the power is turned off or cut off, the relay control circuit 5 detects that the power is turned off or cut off, and switches the relay circuits 3 and 6 to the b side. Further, when the power is turned off or cut off, the spindle motor shifts from the steady rotation state to the stopped state. At this time, the spindle motor 1 works as a generator,
A back electromotive force is generated in the coil of the spindle motor 1. The back electromotive force passes through the relay circuit 3 and is input to the rectifier circuit 4. The input back electromotive force is rectified by a rectifier circuit 4, and is input to the actuator tough through a relay circuit 6. The actuator 7 quickly moves in the direction of the landing zone of the magnetic head by the output signal from the rectifier circuit 4, and accurately and efficiently returns the magnetic head to the landing zone.

〔発明の効果〕〔Effect of the invention〕

以上説明したように、本発明は電源オフ時または、電源
遮断時にスピンドルモータを発電機として使用し、スピ
ンドルモータの定常回転状態から停止状態に移るときに
生じる逆起電圧を使って、アクチュエー・夕を動かすこ
とによってバネなどの外力の影響がなく、大型の大容姓
コンデンサを必要とせずに、効率良く、正確に磁気ヘッ
ドをランディングゾーンに戻すことができるという効果
がある。
As explained above, the present invention uses the spindle motor as a generator when the power is turned off or cut off, and uses the back electromotive force generated when the spindle motor changes from a steady rotation state to a stopped state to generate an actuator and a generator. By moving the magnetic head, there is no influence of external forces such as springs, and the magnetic head can be returned to the landing zone efficiently and accurately without the need for a large capacitor.

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

第1図は本発明の一実施例を示すアクチュエータ定位置
復帰回路のブロック図である。
FIG. 1 is a block diagram of an actuator home position return circuit showing one embodiment of the present invention.

Claims (1)

【特許請求の範囲】[Claims] 磁気ディスクを回転させるためのスピンドルモータと、
前記スピンドルモータを駆動するためのスピンドルモー
タ駆動回路と、電源オフ時または電源遮断時に前記スピ
ンドルモータを発電機として使用し前記スピンドルモー
タの定常回転状態から停止状態に移るときに生じる逆起
電圧を整流するための整流回路と、磁気ヘッドを目標位
置に移動させるアクチュエータと、前記アクチュエータ
を駆動するためのアクチュエータ駆動回路と、電源オフ
時または電源遮断時に前記スピンドルモータの逆起電圧
を前記整流回路に流すように切り換える第一のリレー回
路と、電源オフ時または電源遮断時に前記アクチュエー
タの入力信号をアクチュエータ駆動回路の出力信号から
前記整流回路の出力信号に切り換える第二のリレー回路
と、電源の状態を検出し前記第1のリレー回路と前記第
2のリレー回路とを制御するリレー制御回路とを備える
ことを特徴とするアクチュエータ定位置復帰回路。
a spindle motor for rotating the magnetic disk;
A spindle motor drive circuit for driving the spindle motor, and rectifying a back electromotive force generated when the spindle motor changes from a steady rotation state to a stopped state by using the spindle motor as a generator when the power is turned off or cut off. an actuator for moving the magnetic head to a target position; an actuator drive circuit for driving the actuator; and a back electromotive voltage of the spindle motor flowing through the rectifier circuit when the power is turned off or cut off. a first relay circuit that switches the input signal of the actuator from the output signal of the actuator drive circuit to the output signal of the rectifier circuit when the power is turned off or cut off, and a second relay circuit that detects the state of the power supply. An actuator home position return circuit comprising: a relay control circuit that controls the first relay circuit and the second relay circuit.
JP29593186A 1986-12-12 1986-12-12 Resetting circuit for actuator to specified position Pending JPS63149886A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP29593186A JPS63149886A (en) 1986-12-12 1986-12-12 Resetting circuit for actuator to specified position

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP29593186A JPS63149886A (en) 1986-12-12 1986-12-12 Resetting circuit for actuator to specified position

Publications (1)

Publication Number Publication Date
JPS63149886A true JPS63149886A (en) 1988-06-22

Family

ID=17826971

Family Applications (1)

Application Number Title Priority Date Filing Date
JP29593186A Pending JPS63149886A (en) 1986-12-12 1986-12-12 Resetting circuit for actuator to specified position

Country Status (1)

Country Link
JP (1) JPS63149886A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0598446A3 (en) * 1992-11-17 1994-07-20 Koninkl Philips Electronics Nv Motor drive circuit, as well as a data reading and/or recording apparatus comprising such a motor drive circuit.
US5486957A (en) * 1994-06-01 1996-01-23 International Business Machines Corporation Disk drive with rectifier circuit for parking the head carriers on power down

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0598446A3 (en) * 1992-11-17 1994-07-20 Koninkl Philips Electronics Nv Motor drive circuit, as well as a data reading and/or recording apparatus comprising such a motor drive circuit.
US5486957A (en) * 1994-06-01 1996-01-23 International Business Machines Corporation Disk drive with rectifier circuit for parking the head carriers on power down

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