JPS60191477A - Positioning mechanism for oscillatory magnetic head - Google Patents

Positioning mechanism for oscillatory magnetic head

Info

Publication number
JPS60191477A
JPS60191477A JP4500784A JP4500784A JPS60191477A JP S60191477 A JPS60191477 A JP S60191477A JP 4500784 A JP4500784 A JP 4500784A JP 4500784 A JP4500784 A JP 4500784A JP S60191477 A JPS60191477 A JP S60191477A
Authority
JP
Japan
Prior art keywords
magnetic head
center
gravity
axis
center shaft
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
JP4500784A
Other languages
Japanese (ja)
Inventor
Hiroshi Matsumoto
博 松本
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP4500784A priority Critical patent/JPS60191477A/en
Publication of JPS60191477A publication Critical patent/JPS60191477A/en
Pending 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
    • 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

Abstract

PURPOSE:To stabilize positioning operation by aligning the position of a rotary center shaft to a center position of an impact to the center of gravity of a magnetic head and the whole oscillation part. CONSTITUTION:The rotary center shaft 3 is so arranged that xS=xG+I/MXG, where M is the total mass of the oscillation part consisting of the magnetic head 1, a head arm, the rotary center shaft 3, and the movable part 5 of a driving motor, I is moment of inertia, and (xG, 0) and (xS, 0) are coordinates of the center 8 of gravity and the rotary center shaft 3. Consequently, the rotary center shaft 3 is aligned to the center of the impact and a core gap 7 is held in a stationary state. Namely, when force F(t) operates on the rotary center shaft 3 in the direction of a (y) axis 10, the kinetic equation of the center 8 of gravity in the direction of the (y) axis 10 is as shown by I, where yG is fine displacement. When time t is 0 and initial displacement and an initial speed are also 0, an equation II holds. The kinetic equation in the rotational direction around the center of gravity, on the other hand, is as shown by III. When time t is 0 and an initial rotation angle and an initial angular speed are 0, an equation IV holds. Therefore, when the fine displacement of the core gap part 7 in the direction of the (y) axis 10 is denoted as yH, theta is considered to be fine, so an equation V holds. However, yH=0 because xS=I/MXG+XG.

Description

【発明の詳細な説明】 〔発明の技術分野〕 この発明は、電子計算機の外部記憶装置である磁気ディ
スク装置において、記録再生あるいは再生用の磁気ヘッ
ドを磁気円板上の任意の位置に移動させるための揺動形
磁気ヘッド位置決め機構に関するものである。[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a magnetic disk device that is an external storage device for an electronic computer, in which a magnetic head for recording and reproduction is moved to an arbitrary position on a magnetic disk. The present invention relates to an oscillating magnetic head positioning mechanism.

〔従来技術〕[Prior art]

第１図は従来の揺動形磁気ヘッド位置決め機構を示す平
面図であり、図において、（１）は電磁変換素子である
磁気ヘッド、（２）はこの磁気ヘッド（１）を支持する
ためのへラドアーム、（３）はこのヘッドアーム（２）
を保持し、回転運動の中心となる回転中心軸、（４）Ｆ
ｉこの回転中心軸（３）全支持するための軸受または軸
受を含む支持台（以下、これらを総合した意味で軸受と
呼ぶ’）　、（５１は前記へラドアーム（２）を回転運
動させるための駆動用モータの可動部、（６）は同じく
駆動用モータの固定部である。Fig. 1 is a plan view showing a conventional oscillating magnetic head positioning mechanism. Herad arm, (3) is this head arm (2)
(4) F
i A bearing for fully supporting this rotational center shaft (3) or a support base including a bearing (hereinafter referred to as a bearing in a comprehensive sense), (51 is a bearing for rotating the helad arm (2). The movable part (6) of the drive motor is also a fixed part of the drive motor.

次に動作について説明する。通常、駆動用モータの可動
部（５）および固定部（６）に制御回路（図示省略）か
らの信号が入力されると、可動部（５）が矢印人の方向
に移動し、軸受（４）に支持された回転中心軸（３）を
中心として回転移動を行う。その結果、駆動用モータの
可動部（５）と結合されたヘッドアーム（２）および磁
気ヘッド（１）は矢印Ｂの方向に回転移動する。回転移
動した磁気ヘッド（１）は磁気円板（図示省略）上の目
標位置に位置決めされ、磁気円板上の情報の記録、再生
を行う。Next, the operation will be explained. Normally, when a signal from a control circuit (not shown) is input to the movable part (5) and fixed part (6) of the drive motor, the movable part (5) moves in the direction of the arrow, and the bearing (4) moves in the direction of the arrow. ) Rotational movement is performed around a rotational center shaft (3) supported by a rotary shaft (3). As a result, the head arm (2) and the magnetic head (1) coupled to the movable part (5) of the drive motor rotate in the direction of arrow B. The rotationally moved magnetic head (1) is positioned at a target position on a magnetic disk (not shown), and records and reproduces information on the magnetic disk.

以上のような動作が行われる場合、情報を正確に記録、
再生するためには、位置決めされている磁気ヘッド（１
）は、外部からの機械的振動などの外乱によシ容易に動
かないことが望ましい。If any of the above operations occur, please record the information accurately.
To play, the positioned magnetic head (1
) should not move easily due to disturbances such as external mechanical vibrations.

一方、従来の磁気ヘッド位置決め悦機構においては、回
転中心軸（３）の位置は揺動部、すなわち磁気ヘッド（
１）、ヘッドアーム（２）、回転中心軸（３）および駆
動用モータの可動部（５）からなる組立体の重心ならび
に磁気ヘッド（１）に対する衝撃中心位置に一致してい
なかった。On the other hand, in the conventional magnetic head positioning mechanism, the position of the rotation center axis (3) is determined by the swinging part, that is, the magnetic head (
1) The center of gravity of the assembly consisting of the head arm (2), the central axis of rotation (3), and the movable part of the drive motor (5) and the center of impact on the magnetic head (1) were not aligned.

従来の磁気ヘッド位置決め機構は以上のように構成され
ているので、軸受（４）を通して回転中心軸（３）に外
部から回転面内の振動が伝達されたり、あるいは回転中
心軸（３）および軸受（４）自体が回転面内方向に振動
した場合、磁気ヘット責ｌ）にも振動が伝達されて、位
置決め精度を劣化させ、磁気円板上の情報の正確外記録
、再生ができないという欠点があった。Since the conventional magnetic head positioning mechanism is configured as described above, vibrations within the rotating plane are transmitted from the outside to the rotation center shaft (3) through the bearing (4), or the rotation center shaft (3) and the bearing (4) If the magnetic head itself vibrates in the direction of the rotating plane, the vibration is also transmitted to the magnetic head (l), deteriorating the positioning accuracy and making it impossible to record or reproduce information on the magnetic disk accurately. there were.

〔発明の概要〕[Summary of the invention]

この発明は上記のような従来のものの欠点を除去する目
的でなされたもので、回転中心軸の位置を、磁気ヘッド
および揺動郡全体の重心に対する衝撃中心位置に一致さ
せることにより、回転中心軸および軸受に外部の振動が
伝達されたり、あるいは回転中心軸および軸受自体が回
転面内方向に振動した場合でも、磁気ヘッドには振動が
伝わらず、安定して位置決めできる揺動形磁気ヘッド位
置決め機構を提供するものである。This invention was made for the purpose of eliminating the drawbacks of the conventional ones as described above, and by aligning the position of the center axis of rotation with the position of the center of impact with respect to the center of gravity of the magnetic head and the entire oscillating group, the center axis of rotation can be adjusted. And, even if external vibrations are transmitted to the bearing, or even if the central axis of rotation and the bearing itself vibrate in the direction of the rotating plane, the vibration will not be transmitted to the magnetic head and the swinging magnetic head positioning mechanism will allow stable positioning. It provides:

〔発明の実施例〕[Embodiments of the invention]

以下、この発明の一実施例を図について説明する。第２
図はこの発明の一実施例による揺動形磁気ヘッド位置決
め機構を示す要部の平面図であシ、図において、（１）
ないしく５）は第１図と同一または相当部分を示す。（
７）は磁気ヘッド（１）のコアギャップ部、（８）は回
転中心軸（３）を中心に揺動運動をする揺動郡全体の重
心、（９）は静止した状態で前記コアギャップ部（７）
と重心（８）を結んだもので、静止状態でのコアギャッ
プ部（力を原点とする座標系のＸ軸、（１〔はコアギャ
ップ部（７）を通って前記Ｘ軸（９）と直交するｙ軸で
ある。回転中心軸（３）は磁気ヘッド（１）のコアギャ
ップ部（７）および揺動部の重心（８）にする衝撃中心
位置に存在するように、Ｘ軸（９）上に配置されている
。θは重心まわりの回転角である。An embodiment of the present invention will be described below with reference to the drawings. Second
The figure is a plan view of the main parts of a swing type magnetic head positioning mechanism according to an embodiment of the present invention. In the figure, (1)
or 5) indicates the same or corresponding parts as in FIG. 1. (
7) is the core gap portion of the magnetic head (1), (8) is the center of gravity of the entire oscillating group that oscillates around the rotation center axis (3), and (9) is the core gap portion in a stationary state. (7)
and the center of gravity (8), and the X-axis of the coordinate system whose origin is the core gap part (force) in a stationary state, (1) connects the X-axis (9) through the core gap part (7). The axis of rotation (3) is perpendicular to the y-axis. ). θ is the rotation angle around the center of gravity.

衝撃中心とは衝撃中心理論における衝撃中心を意味し、
衝撃中心の外力によって生じる並進変位と回転変位がコ
アギャップ部（７）でキャンセルするような位置で、重
心（８）とは異なる位置に存在する。Shock center means the shock center in the shock center theory,
This is a position where translational displacement and rotational displacement caused by an external force at the impact center are canceled at the core gap portion (7), and is located at a position different from the center of gravity (8).

一般に衝撃中心理論は野球のバットとボールの当る位置
について説明されるが、ボールがノ（ットにジャストミ
ートして手に衝撃が伝わらないときのボールの当った位
置が衝撃中心であって、本発明では回転中心軸（３）が
この位置におかれ、コアギャップ部（７）はバットを握
る手の位置に相当する。磁気ヘッド（１）、ヘッドアー
ム（２）、回転中心軸（３）、および駆動用モータの可
動部（５）からなる揺動郡全体の質量をＭ１慣性モーメ
ントを工とし、重心（８）の座標を（ｘＧ、Ｏ）、回転
中心軸（３）の座標を（ｘｓ、Ｏ）とした時に’　ｘｓ
”　ｘｏ十Ｍ’ＸＧ　なる関係を満たすように１回転中
心軸（３）を配置すると、回転中心軸（３）は衝撃中心
に一致することになる。他の構成は第１図と同様である
。The center of impact theory is generally explained in terms of the point where the ball hits the baseball bat, but the center of impact is the point where the ball hits the ball when it just hits the ball and the impact is not transmitted to the hand. In the invention, the rotation center axis (3) is placed at this position, and the core gap portion (7) corresponds to the position of the hand gripping the bat.Magnetic head (1), head arm (2), rotation center axis (3) , and the mass of the entire swing group consisting of the movable part (5) of the drive motor is expressed as M1 moment of inertia, the coordinates of the center of gravity (8) are (xG, O), and the coordinates of the rotation center axis (3) are ( xs, O),' xs
If the center axis of one rotation (3) is arranged so as to satisfy the relationship `` xo 1 M' .

次に、上記のように構成された揺動形磁気ヘッド位置決
め機構の作用について説明する。今、回転中心軸（３）
にｙ軸α０）の方向に外乱として力Ｆ　（ｔ）が働くも
のとする。ただし、ｔは時間を表わす。Next, the operation of the oscillating magnetic head positioning mechanism configured as described above will be explained. Now, the rotation center axis (3)
Assume that a force F (t) acts as a disturbance in the direction of the y-axis α0). However, t represents time.

重心（８）のｙ軸α（２）方向の運動方程式は、微小変
位をｙａとして、 となる。時間ｔ＝０で、初期変位、初期速度をＯとする
と、 ｙｏ＝’ｆ　Ｉ’Ｆ（ｔ）ｄｔｄｔ ＭＯ となる。一方、重心まわりの回転方向の運動方程式は、 ■ツーＦ（ｔ）（Ｘ８−ｘｏ） となる。時間１＝０で、初期回転角、初期角速度を０と
すると、 ０＝ｘＳ””Ｉ’、’ＪＩ’Ｆ（ｔ）ｄｔｄｔとなる。The equation of motion of the center of gravity (8) in the y-axis α(2) direction is as follows, where ya is the minute displacement. When the initial displacement and initial velocity are O at time t=0, yo='f I'F(t)dtdt MO. On the other hand, the equation of motion in the rotational direction around the center of gravity is: (2) F(t)(X8-xo). If time 1=0 and the initial rotation angle and initial angular velocity are 0, then 0=xS""I','JI'F(t)dtdt.

従って、コアギャップ部（７）のｙ軸傾方向の微小変位
をＹＨとすると、θは微小と考えることにより、 ＹＨ＝　Ｙｏ−θ ＝Ｊ工Ｆ（ｔ）ｄｔｄｔ　− （ＸＳ　ＸＧ）　Ｊｌ、’ＪＬ’Ｆ（ｔ）ｄｔｄｔ置し
ているので、 ＹＨ−０ とカリ、コアギャップ部（７）は静止した状態を保つこ
とができる。Therefore, if the minute displacement of the core gap part (7) in the y-axis tilt direction is YH, then by considering θ to be minute, YH=Yo-θ=JF(t)dtdt-(XS XG) Jl,' Since JL'F(t)dtdt is placed, YH-0, Potash, and the core gap portion (7) can remain stationary.

以上の作用はｙ軸００）方向の微小々変位に着目したも
のであるから、磁気ヘッド（１）の位置決めが行われる
任意の位置についてあてはまる。これは磁気ヘッド（１
）の回転移動とともに座標系も回転すると考えられるか
らである。また、上記のような配置にした場合、磁気ヘ
ッド（１）の位置決めに悪影響を及ばず外力の成分は、
概ね磁気ヘッド（１）の回転方向の成分、すなわちｙ軸
００）と平行な成分であるから、この発明が有効である
ことがわかる。他の作用は第１図の場合と同様である。Since the above action focuses on minute displacements in the y-axis 00) direction, it applies to any position where the magnetic head (1) is positioned. This is a magnetic head (1
) is considered to rotate along with the rotational movement of the coordinate system. In addition, when the above arrangement is adopted, the positioning of the magnetic head (1) is not adversely affected and the component of the external force is
It can be seen that the present invention is effective because the component is approximately in the rotational direction of the magnetic head (1), that is, the component is parallel to the y-axis 00). Other operations are the same as in the case of FIG.

なお、上記実施例では、回転中心軸に対して外乱が働く
場合について示したが、外乱の働く位置が他にあっても
良く、最も主たる外乱に対して有効となシ得るように、
衝撃中心を配置すれば良い。In the above embodiment, the case where the disturbance acts on the rotation center axis is shown, but the disturbance may act at other positions, and in order to be most effective against the main disturbance,
All you have to do is place the center of impact.

〔発明の効果〕〔Effect of the invention〕

以上のように、この発明によれば、回転中心軸の位置を
磁気ヘッドのコアギャップ部および揺動部の重心に対す
る衝撃中心位置に配置するように構成したので、回転中
心軸および軸受を通して伝達される振動が磁気ヘッドに
は伝達されず、このため安定して位置決めが行われ、記
録、再生する情報の信頼性を高めることができるという
効果がある。As described above, according to the present invention, the rotation center axis is arranged at the impact center position with respect to the core gap portion of the magnetic head and the center of gravity of the swinging portion, so that the rotation center axis is located at the impact center position with respect to the core gap portion of the magnetic head and the center of gravity of the swinging portion. The vibration caused by the head is not transmitted to the magnetic head, so that positioning is performed stably, and the reliability of recorded and reproduced information can be improved.

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

第１図は従来の揺動形磁気ヘッド位置決め機構を示す平
面図、第２図はこの発明の一実施例による揺動形磁気ヘ
ッド位置決め機構を示す要部の平面図である。 （１）・・・磁気ヘラ）”、（２）・・・ヘッドアーム
、（３）・・・回転中心軸、（５）・・・駆動用モータ
の可動部、（７）・・・コアギャップ部、（８）・・・
重心。 なお、各図中、同一符号は同一または相当部分を示す。 代理人　大岩増雄 第１図FIG. 1 is a plan view of a conventional oscillating magnetic head positioning mechanism, and FIG. 2 is a plan view of essential parts of a oscillating magnetic head positioning mechanism according to an embodiment of the present invention. (1)...Magnetic spatula)'', (2)...Head arm, (3)...Rotation center axis, (5)...Movable part of drive motor, (7)...Core Gap part, (8)...
Center of gravity. In each figure, the same reference numerals indicate the same or corresponding parts. Agent Masuo Oiwa Figure 1

Claims (3)

【特許請求の範囲】[Claims] （１）電磁変換素子である磁気ヘッドと、この磁気ヘッ
ドを支持するヘッドアームと、このヘッドアームを保持
し、かつ所定の軸線を中心として揺動運動させるための
回転中心軸および軸受と、前記へラドアームに回転力を
発生させるための駆動用モータとを備えた揺動形磁気ヘ
ッド位置決め機構において、回転中心軸の位置が、回転
円弧の作る面と同一平面内で、かつ磁気ヘッドおよび揺
動部の重心に対する衝撃中心に一致していることを特徴
とする揺動形磁気ヘッド位置決め機構。(1) A magnetic head that is an electromagnetic transducer, a head arm that supports this magnetic head, a rotation center shaft and a bearing that holds this head arm and makes it swing around a predetermined axis; In an oscillating magnetic head positioning mechanism that is equipped with a drive motor for generating rotational force in the Herad arm, the position of the center axis of rotation is within the same plane as the surface formed by the rotation arc, and the magnetic head and the oscillating An oscillating magnetic head positioning mechanism characterized in that the center of impact coincides with the center of gravity of the part. （２）衝撃中心が磁気ヘッドのコアギャップに対するも
のであることを特徴とする特許請求の範囲第１項記載の
揺動形磁気ヘッド位置決め機構。(2) The oscillating magnetic head positioning mechanism according to claim 1, wherein the center of impact is with respect to the core gap of the magnetic head. （３）揺動部が磁気ヘッド、ヘッドアーム、回転中心軸
および駆動用モータの可動部からなることを特徴とする
特許請求の範囲第１項または第２項記載の揺動形磁気ヘ
ッド位置決め機構。(3) The oscillating magnetic head positioning mechanism according to claim 1 or 2, characterized in that the oscillating part is composed of a magnetic head, a head arm, a rotation center shaft, and a movable part of a drive motor. .
JP4500784A 1984-03-09 1984-03-09 Positioning mechanism for oscillatory magnetic head Pending JPS60191477A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4500784A JPS60191477A (en) 1984-03-09 1984-03-09 Positioning mechanism for oscillatory magnetic head

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4500784A JPS60191477A (en) 1984-03-09 1984-03-09 Positioning mechanism for oscillatory magnetic head

Publications (1)

Publication Number Publication Date
JPS60191477A true JPS60191477A (en) 1985-09-28

Family

ID=12707317

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4500784A Pending JPS60191477A (en) 1984-03-09 1984-03-09 Positioning mechanism for oscillatory magnetic head

Country Status (1)

Country Link
JP (1) JPS60191477A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100397600B1 (en) * 1996-06-28 2003-11-10 삼성전자주식회사 Head stack assembly for hard disk drive

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100397600B1 (en) * 1996-06-28 2003-11-10 삼성전자주식회사 Head stack assembly for hard disk drive

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