JPS6124072A - Magnetic disc device - Google Patents

Magnetic disc device

Info

Publication number
JPS6124072A
JPS6124072A JP14484084A JP14484084A JPS6124072A JP S6124072 A JPS6124072 A JP S6124072A JP 14484084 A JP14484084 A JP 14484084A JP 14484084 A JP14484084 A JP 14484084A JP S6124072 A JPS6124072 A JP S6124072A
Authority
JP
Japan
Prior art keywords
magnetic head
magnetic
magnetic disk
drive
signal
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
JP14484084A
Other languages
Japanese (ja)
Other versions
JPH0352670B2 (en
Inventor
Takeo Masuda
竹夫 増田
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.)
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 JP14484084A priority Critical patent/JPS6124072A/en
Publication of JPS6124072A publication Critical patent/JPS6124072A/en
Publication of JPH0352670B2 publication Critical patent/JPH0352670B2/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
    • G11B5/58—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 for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B5/596—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 for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for track following on disks

Landscapes

  • Moving Of Head For Track Selection And Changing (AREA)

Abstract

PURPOSE:To attain positioning control of a magnetic head by interrupting an input of a control signal for a prescribed time after a magnetic disc reaches a steady-state rotation and inputting externally a prescribed drive signal to magnetic head drive system. CONSTITUTION:A magnetic disc device is started by application of power and number of revolutions of the magnetic disc reaches a steady-state value, then a monostable multivibrator 10 generates a pulse with a prescribed time width and only a constant DC voltage V is fed to an amplifier 5 from the outside of the servo system. Then the supply of a control signal CS generated by a magnetic head position signal fed back from the servo system and a magnetic head speed signal fed back from a drive motor 4 is interrupted. During this time, the magnetic head is kept to a position in contact with the inside stopper 7. Thus, the amplifier is simplified and cost-down and light weight is attained.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は磁気ディスク装置、とくにサーボ面から得られ
る磁気ヘッド位置信号をフィードバックして磁気ヘッド
の位置決め制御をおこなう方式の磁気ディスク装置に関
する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic disk device, and particularly to a magnetic disk device that controls the positioning of a magnetic head by feeding back a magnetic head position signal obtained from a servo surface.

磁気ディスク装置においては、磁気ヘッドの位置決め制
御系の故障等によって、磁気ヘッドが他の構造体に接触
し破損することを防止するため。In magnetic disk drives, this is to prevent the magnetic head from coming into contact with other structures and being damaged due to a failure in the magnetic head positioning control system.

磁気ヘッドが所定範囲から出ないように、内側および外
側に機械的なストッパを設けている。Mechanical stoppers are provided on the inside and outside to prevent the magnetic head from coming out of a predetermined range.

このため、前記サーボ面を備える磁気ディスク装置にお
いては、磁気ヘッドの位置決め制御が前記ストッパに触
れない範囲で行われるようにするため、第２図にハンチ
ングによって示すように。For this reason, in a magnetic disk device equipped with the servo surface, the positioning control of the magnetic head is performed within a range that does not touch the stopper, as shown by hunting in FIG. 2.

サーボ面の内側および外側には、それぞれ数トランク分
のイレーズ領域（サーボ情報が書き込まれていない領域
）を設けている。Erase areas (areas in which servo information is not written) for several trunks are provided on the inside and outside of the servo surface, respectively.

そこで、電源を投入して磁気ディスク装置を起動したと
き、磁気ヘッドが、サーボ情報が書き込まれている領域
に位置せず、もし前記イレーズ領域にあった場合には磁
気ヘッドの現在位置を検知できず、上位装置からトラン
ク番号を与えられても磁気ヘッドを駆動すべき方向を判
別することが出来ない。Therefore, when the power is turned on and the magnetic disk device is started, the magnetic head is not located in the area where servo information is written, but if it is in the erase area, the current position of the magnetic head cannot be detected. First, even if a trunk number is given from a host device, it is not possible to determine the direction in which the magnetic head should be driven.

したがって、サーボ面の内側と外側とにイレーズ領域を
設けた磁気ディスク装置では、何等かの手段によって、
起動時における磁気ヘッドの位置を明確にして置く必要
がある。Therefore, in a magnetic disk drive in which erase areas are provided on the inside and outside of the servo surface, by some means,
It is necessary to clearly position the magnetic head at startup.

ところで、このような手段は、アクセス時における磁気
ヘッドの位置決め制御に対し何等かの妨げを与えるもの
であってはならない。By the way, such means must not interfere in any way with positioning control of the magnetic head during access.

〔従来の技術〕[Conventional technology]

第３図は磁気ディスク装置の従来例の構成図であり、１
は磁気ディスク、２は磁気ヘッド、３は磁気ヘッド２を
保持し軸Ｓに関し回動するアクセスアーム、４と５は磁
気ヘッド駆動系の要部を構成し、４はアクセスアーム３
を介して磁気ヘッド２を駆動する駆動モータ（Ｍ）、５
は入力信号に応じた駆動電流を生成して駆動モータ４に
供給する増１１１６　（ＡＭＰ）　、　　６はアクセス
アーム３の回動範囲を制約する外側ストッパ、７は同内
側ストッパ、また８はアクセスアーム３に対し図示矢印
方向の力を与えるスプリングである。FIG. 3 is a configuration diagram of a conventional example of a magnetic disk device.
2 is a magnetic disk, 2 is a magnetic head, 3 is an access arm that holds the magnetic head 2 and rotates about the axis S, 4 and 5 constitute the main parts of the magnetic head drive system, and 4 is the access arm 3.
A drive motor (M), 5 that drives the magnetic head 2 via the
1116 (AMP) generates a drive current according to an input signal and supplies it to the drive motor 4; 6 is an outer stopper that restricts the rotation range of the access arm 3; 7 is an inner stopper; 8 is an access arm 3 is a spring that applies a force in the direction of the arrow shown in the figure.

すなわち、起動時、まだ駆動モータ４に対し駆動電流が
供給されていないとき、アクセスアーム３はスプリング
８によって内側ストッパ７に接触する位置に保持される
。That is, at the time of startup, when drive current is not yet supplied to the drive motor 4, the access arm 3 is held in a position where it contacts the inner stopper 7 by the spring 8.

・〔発明が解決しようとする問題点〕 上記構成の磁気ディスク装置においては、スプリング８
による力が常にアクセスアーム３に対し作用している。・[Problem to be solved by the invention] In the magnetic disk device having the above configuration, the spring 8
force is always acting on the access arm 3.

このため、磁気ヘッド２を内側方向に駆動する場合と外
側方向に駆動する場合とに応じて、駆動モータ４に供給
する電流を変える必要があり、したがって、増幅器５に
複雑な調整回路を設けなければならないという問題点が
ある。Therefore, it is necessary to change the current supplied to the drive motor 4 depending on whether the magnetic head 2 is driven inward or outward. Therefore, the amplifier 5 must be provided with a complicated adjustment circuit. There is a problem that it must be done.

〔問題点を解決するための手段〕[Means for solving problems]

本発明は、サーボ面から再生される磁気ヘッド位置信号
によって得られる制御信号を磁気ヘッド駆動系に入力し
て磁気ヘッドの位置決め制御をおこなう磁気ディスク装
置において、磁気ディスク装置を起動し磁気ディスクが
定常回転に達してから所定時間にわたって前記磁気ヘッ
ド駆動系に対する前記制御信号の入力を遮断するととも
に該磁気ヘッド駆動系に対し外部から所定の駆動信号を
入力する手段を設けることによって、前記問題点の解消
を図ったものである。The present invention provides a magnetic disk drive that controls the positioning of a magnetic head by inputting a control signal obtained from a magnetic head position signal reproduced from a servo surface to a magnetic head drive system, and in which the magnetic disk drive is started and the magnetic disk is at a steady state. The above-mentioned problem is solved by providing means for cutting off the input of the control signal to the magnetic head drive system for a predetermined period of time after the rotation has been reached, and for inputting a predetermined drive signal from the outside to the magnetic head drive system. The aim is to

〔作用〕[Effect]

すなわち、磁気ディスク装置を起動し磁気ディスクの回
転数が定常値に達したあと、磁気ヘッド駆動系に対し、
所定時間にわたって外部から所定の駆動信号を印加し、
この間だけ、磁気ヘッドを内側または外側のストッパに
接触する位置に保持することによって、−起動時におけ
る磁気ヘッド位置を明確にするようにしたものである。In other words, after the magnetic disk drive is started and the rotational speed of the magnetic disk reaches a steady value, the magnetic head drive system is
Applying a predetermined drive signal from the outside for a predetermined time,
By holding the magnetic head in a position in contact with the inner or outer stopper only during this time, the position of the magnetic head at the time of startup is made clear.

〔実施例〕〔Example〕

以下に本発明の要旨を第１図に示す実施例によって兵′
体的に説明する。The gist of the present invention will be explained below with reference to the embodiment shown in FIG.
Explain physically.

第り図は本発明一実施例の構成を示すブロック図であり
、第３図従来例と共通する符号は同一対象を指す。FIG. 3 is a block diagram showing the configuration of an embodiment of the present invention, and the same reference numerals as those in the conventional example in FIG. 3 refer to the same objects.

その他、９は磁気ディスク回転モータのスピンドルに設
けられる回転計によって磁気ディスクの回転数を監視し
定常値に達したとき検出信号を出力する検出器、　１０
は検出器９の検出信号を入力として所定時間長のパルス
を発生する単安定マルチバイブレーク（ＳＳＭＭ）、１
１は単安定マルチバイブレーク１０の出力を反転する反
転回路、１２は反転回路１１の出力が“０″の間、増幅
器５に対し。In addition, 9 is a detector that monitors the number of rotations of the magnetic disk using a tachometer provided on the spindle of the magnetic disk rotation motor and outputs a detection signal when a steady value is reached; 10
1 is a monostable multi-bi break (SSMM) which generates a pulse of a predetermined time length by inputting the detection signal of the detector 9;
1 is an inverting circuit that inverts the output of the monostable multi-bi break 10, and 12 is for the amplifier 5 while the output of the inverting circuit 11 is "0".

サーボ面からフィードバンクされる磁気ヘッド位置信号
によって得られる制御信号ＣＳの供給を遮断するスイッ
チ（ＳＷ）、１３は単安定マルチバイブレーク１０の出
力が“０”の間、増幅器５に対し。A switch (SW) 13 for cutting off the supply of the control signal CS obtained by the magnetic head position signal fed from the servo surface is applied to the amplifier 5 while the output of the monostable multi-vib break 10 is "0".

一定の直流電圧Ｖを外部から供給するスイッチである。This is a switch that supplies a constant DC voltage V from the outside.

以上のような構成によって、電源の投入によって磁気デ
ィスク装置が起動され、磁気ディスクの回転数が定常値
に達すると、単安定マルチバイブレーク１０は一定時間
幅のパルスを発生し、この間は、サーボ系の外部から一
定の直流電圧■だけが増幅器５に供給され、サーボ面か
らフィードバンクされる磁気ヘッド位置信号、および駆
動モータ４からフィードバックされる磁気ヘッド速度信
号等によって生成される制御信号ＣＳの供給が遮断され
る。With the above configuration, when the magnetic disk drive is started by turning on the power and the rotational speed of the magnetic disk reaches a steady value, the monostable multi-by-break 10 generates a pulse with a fixed time width, and during this period, the servo system Only a constant DC voltage (2) is supplied to the amplifier 5 from the outside, and a control signal CS generated by a magnetic head position signal fed back from the servo surface, a magnetic head speed signal fed back from the drive motor 4, etc. is supplied. is blocked.

したがって、この間、磁気ヘッドは内側のストソバ７に
接触する位置に保持される。Therefore, during this time, the magnetic head is held at a position in contact with the inner stobrow 7.

〔発明の効果〕〔Effect of the invention〕

以上説明したように１本発明によれば、従来例における
スプリングを不要とし、したがって増幅器を簡略化でき
、コストダウンおよび軽量化等の効果が得られる。As explained above, according to the present invention, the spring in the conventional example is not required, and therefore the amplifier can be simplified, and effects such as cost reduction and weight reduction can be obtained.

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

第１図は本発明一実施例の構成を示すブロック図。 第２図はイレーズ領域を持つサーボ面に関する説明図。 第３図は従来例の構成図である。 図中。 １は磁気ディスク、　　　２は磁気ヘッド。 ４は駆動モータ、　　　　５は増幅器 ９は検出器。 １０は単安定マルチバイブレーク。 １２と１３はスイッチである。 亨　　１　　因 FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. FIG. 2 is an explanatory diagram of a servo surface having an erase area. FIG. 3 is a configuration diagram of a conventional example. In the figure. 1 is a magnetic disk, 2 is a magnetic head. 4 is the drive motor, 5 is the amplifier 9 is a detector. 10 is a monostable multi-bi break. 12 and 13 are switches. Toru 1 Cause

Claims (1)

【特許請求の範囲】[Claims] サーボ面から再生される磁気ヘッド位置信号によって得
られる制御信号を磁気ヘッド駆動系に入力して磁気ヘッ
ドの位置決め制御をおこなう磁気ディスク装置において
、磁気ディスク装置を起動し磁気ディスクが定常回転に
達してから所定時間にわたって前記磁気ヘッド駆動系に
対する前記制御信号の入力を遮断するとともに該磁気ヘ
ッド駆動系に対し外部から所定の駆動信号を入力する手
段を設けたことを特徴とする磁気ディスク装置。In a magnetic disk device that controls the positioning of the magnetic head by inputting a control signal obtained from a magnetic head position signal reproduced from a servo surface to the magnetic head drive system, the magnetic disk device is started and the magnetic disk reaches steady rotation. 1. A magnetic disk drive comprising means for blocking input of the control signal to the magnetic head drive system for a predetermined period of time and inputting a predetermined drive signal to the magnetic head drive system from the outside.
JP14484084A 1984-07-12 1984-07-12 Magnetic disc device Granted JPS6124072A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14484084A JPS6124072A (en) 1984-07-12 1984-07-12 Magnetic disc device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14484084A JPS6124072A (en) 1984-07-12 1984-07-12 Magnetic disc device

Publications (2)

Publication Number Publication Date
JPS6124072A true JPS6124072A (en) 1986-02-01
JPH0352670B2 JPH0352670B2 (en) 1991-08-12

Family

ID=15371651

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14484084A Granted JPS6124072A (en) 1984-07-12 1984-07-12 Magnetic disc device

Country Status (1)

Country Link
JP (1) JPS6124072A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63201961A (en) * 1987-02-17 1988-08-22 Hitachi Ltd Carriage control circuit for magnetic disk device
JP2008043753A (en) * 2006-08-17 2008-02-28 Moldetk Precision Corp Counter

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63201961A (en) * 1987-02-17 1988-08-22 Hitachi Ltd Carriage control circuit for magnetic disk device
JP2008043753A (en) * 2006-08-17 2008-02-28 Moldetk Precision Corp Counter

Also Published As

Publication number Publication date
JPH0352670B2 (en) 1991-08-12

Similar Documents

Publication Publication Date Title
JPS6124072A (en) Magnetic disc device
US4607355A (en) Drive system
US4782406A (en) Data transfer apparatus with a disklike record medium and a method of operation therefore
EP0383299A3 (en) Optical disk recording/reproducing apparatus and its disk rotary driving apparatus
JPS5836431B2 (en) head control device
JPH0743875B2 (en) Disk rotation control device
US6724162B2 (en) Motor-control device enabling the rotational speed of the motor's rotor to be measured
KR900010124Y1 (en) Breaking apparatus for spindle of vdp
JPH0237183Y2 (en)
JPH02110003U (en)
JPS63255870A (en) Optical information reader
JPS62155783A (en) Stop device for revolution of motor
JPH0132212Y2 (en)
JP2703195B2 (en) Disc player braking system
JPS63102086A (en) Magnetic tape device
JPS6313178A (en) Head positioning device for disk device
JPS613379A (en) Magnetic disk device
KR910008696A (en) Over rotation prevention device of spindle motor
JPS61107582A (en) Magnetic head control device
JPS63108577A (en) Origin position setting device for head disk device
JPS6182383A (en) Magnetic recorder
KR940016130A (en) Spindle motor protector
JPH02122422A (en) Optical disk device
JPH01258266A (en) Motor driving circuit
JPH05189899A (en) Access system for disc unit

Legal Events

Date Code Title Description
LAPS Cancellation because of no payment of annual fees