JPS6074163A - Positioning device of magnetic head - Google Patents

Positioning device of magnetic head

Info

Publication number
JPS6074163A
JPS6074163A JP18158183A JP18158183A JPS6074163A JP S6074163 A JPS6074163 A JP S6074163A JP 18158183 A JP18158183 A JP 18158183A JP 18158183 A JP18158183 A JP 18158183A JP S6074163 A JPS6074163 A JP S6074163A
Authority
JP
Japan
Prior art keywords
magnetic head
carriage
step motor
torque
power
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
JP18158183A
Other languages
Japanese (ja)
Inventor
Isao Utsugi
宇都木 勲
Tomiyoshi Sato
佐藤 冨義
Toru Sakamoto
通 坂本
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP18158183A priority Critical patent/JPS6074163A/en
Publication of JPS6074163A publication Critical patent/JPS6074163A/en
Pending legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/48Disposition 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
    • G11B5/54Disposition 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
    • G11B5/55Track change, selection or acquisition by displacement of the head

Landscapes

  • Moving Of Heads (AREA)

Abstract

PURPOSE:To eliminate a trouble of write and read-out by adding a frictional load to a carriage from the outside, and preventing a position shift of a magnetic head even when power of a step-motor is off. CONSTITUTION:According to this method, a plate spring 7 is installed to a carriage 2 through a metal sleeve 6 against a guide shaft 5, and the metal sleeve 6 generates a frictional force against the guide shaft 5 by a spring force of the plate spring 7. A frictional load can be generated by setting suitable the plate spring force. In this way, a step-motor is brought to electric conduction and a magnetic head is positioned, and thereafter, even if power is turned off, a position shift of the magnetic head is not generated.

Description

【発明の詳細な説明】 〔発明の利用分野〕 本発明は磁気記録再生装置に係り、特にステップモータ
の電力をオフした時位置ずれを最小にするに好適な磁気
ヘッド位置決め装置に関する。
DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a magnetic recording/reproducing device, and particularly to a magnetic head positioning device suitable for minimizing positional deviation when the power of a step motor is turned off.

〔発明の背景〕[Background of the invention]

磁気ヘッドの位置決めにステップモータを使用する従来
の実施例を図1に示す。図1に於て磁気ヘッド1はキャ
リッジ2に固層されており、キハ・リッジ2はスチール
ベルト3を介してステップモータ4の回転角θ(deg
)により、これに相当する直線移動量yたけガイドシャ
フト5の上を移動する。直線移動量yはステップモータ
4のフ゛−1)径をd、スチールベルト3の厚みをt、
!ニーJ−ル、!:、y二π (d+t)・−一 ・・
・・・・・・・+060 となる。yの量は磁気記録pf生装置のトランク密度に
、lニー)て決まり、例えば1インチ当り1001−ラ
ックでは、トラックピッチは0.254+nmでありy
の値も0.254mmとなる。yの許容誤差は、磁気ヘ
ッドのリードコア1】を0.1.5 rrrmとすると
、書き込下でなければならない。このだめに磁気ディス
クの温度、湿度膨張補償、磁気ディスクのフランツ′精
度向上、磁気ヘッド送り精度の向上が必要である。
A conventional example in which a step motor is used to position a magnetic head is shown in FIG. In FIG. 1, the magnetic head 1 is fixedly mounted on a carriage 2, and the magnetic head 2 is connected to the rotation angle θ (deg) of a step motor 4 via a steel belt 3.
), it moves on the guide shaft 5 by a linear movement amount y corresponding to this. The amount of linear movement y is determined by d being the diameter of the step motor 4 and t being the thickness of the steel belt 3.
! Neil J-le! :, y2π (d+t)・−1 ・・
......+060. The amount of y is determined by the trunk density of the magnetic recording pf generator, for example, at 1001-racks per inch, the track pitch is 0.254+nm and y
The value of is also 0.254 mm. Assuming that the read core 1 of the magnetic head is 0.1.5 rrrm, the tolerance of y must be below writing. To this end, it is necessary to compensate for the temperature and humidity expansion of the magnetic disk, improve the Franz' accuracy of the magnetic disk, and improve the feeding accuracy of the magnetic head.

このうち磁気ヘッド送り精度について詳述すると(1)
式よりyの値はd、t、θで決υ、d、tについては加
工精度の向上で僅少な公差で製作することが出来る。θ
についてはステップモータの製作fft&、すなわち、
固定子歯部精度、エアギャップ精度、回転子歯部精度、
固定子巻線の抵抗、インダクタンスのバラツキ、軸受部
のガタ等の要因で精度が決まシ、回転角θの精度向上に
は苦労している。更に最近、省電力化のためステップモ
ータで磁気ヘッドを所定の位置に移動後、電力をオフし
てしまい、データの書込み読出しを行う磁気記録再生装
置が現われてきている。この場合、回転子に永久磁石を
使用したステップモータの時は電力をオフすることによ
シー担位置決めされた磁気ヘッド位置がずれてしまい、
yの値が許容誤差を越えて誓込み読出した支障をきたす
現象が生じる。この現象を以下図によって詳細に説明す
る。
Of these, the magnetic head feeding accuracy is detailed (1)
From the formula, the values of y are determined by d, t, and θ, and υ, d, and t can be manufactured with small tolerances by improving processing accuracy. θ
For step motor fabrication fft&, i.e.
Stator tooth accuracy, air gap accuracy, rotor tooth accuracy,
Accuracy is determined by factors such as resistance of the stator winding, variations in inductance, and play in the bearing, and it is difficult to improve the accuracy of the rotation angle θ. Furthermore, recently, in order to save power, magnetic recording and reproducing apparatuses have appeared in which the magnetic head is moved to a predetermined position by a step motor and then the power is turned off to write and read data. In this case, when using a step motor that uses a permanent magnet in the rotor, turning off the power will cause the position of the magnetic head that is positioned on the seat to shift.
A troublesome phenomenon occurs in which the value of y exceeds the allowable error and is read out. This phenomenon will be explained in detail below using the figures.

回転子に永久磁石を使用したステップモータは電力を通
電した時に生じる静止トルクと、電力をオフした時に生
じるディーテントトルクが1、両者共角度変位を変える
ことにより増減する。ステップモータを1相励磁方式で
励磁し、磁気へノドの位置決めを行い、その後−力をオ
フすると磁気ヘッドの位置がずれるのは静止トルクと、
ディーテントトルクの安定点位箇、が異るためである1
゜図2に静止トルクとディーテントトルクの安定点が同
一の場合を示す。この場合、どの角度変位に於ても静止
トルクがディーテントトルクより大きいので、磁気ヘッ
ドを同層したキャリッジが静止トルクによって安冗点近
くの八又はB点に位置決めされると、′電力をオフして
もディーテントトルクによっての移@は生じない。ここ
で安定点に磁気ヘッドが位置しないのは、キャリッジと
ガイドシャフトの間に摩擦負荷がおるためである。図3
に静止トルクとディープントトルクの安定点の異る場合
を示す。n正トルクによってキャリッジi:jニーA、
B、C又はD点に位置決めされる。次にF1″〔力をオ
フするとディープントトルクのみが生じていて、ディー
テントトルクより少いキャリッジの摩擦負荷で位置決め
されているC1又は1)点のキャリッジはディーテント
トルりとの安息するC′又はD′点まで移動する。これ
がステップモータの電力をオフし7’(場合の磁気ヘッ
ドの位1hずれ現象であり、ステップモータを省電力化
して使用する欠点となっていた。
In a step motor that uses a permanent magnet in its rotor, the static torque generated when power is applied and the detent torque generated when power is turned off are both increased or decreased by changing the angular displacement. The step motor is excited using a one-phase excitation method to position the nod to the magnetic field, and then when the force is turned off, the position of the magnetic head shifts due to static torque.
This is because the stable point of detent torque is different1.
゜Figure 2 shows the case where the static torque and detent torque have the same stable point. In this case, the static torque is larger than the detent torque at any angular displacement, so when the carriage with the magnetic heads in the same layer is positioned at point 8 or B near the safety point by the static torque, the power is turned off. However, no movement due to detent torque occurs. The reason why the magnetic head is not located at a stable point is because a frictional load is applied between the carriage and the guide shaft. Figure 3
Figure 2 shows the different stable points of static torque and deep torque. Carriage i:j knee A by n positive torque,
Positioned at point B, C or D. Next, the carriage at point F1'' (C1 or 1) where only deep ent torque is generated and is positioned with less friction load of the carriage than the detent torque when the force is turned off, is at rest with the detent torque C ' or D'. This is the phenomenon in which the power of the step motor is turned off and the position of the magnetic head shifts by 1 h when the step motor is turned off.

この欠点を解決する手段としては、−F記かある。2(
1) ステップモータの静止トルりとディーテントトル
クの安定点を一致させる様、ステップモータのi+it
U向上をはかる。
As a means to solve this drawback, there is -F. 2(
1) The i+it of the step motor is adjusted so that the stable torque of the step motor and the stable torque of the step motor match.
We aim to improve U.

(2)静止トルクとディーテントトルりの安定点の異る
ステップモータを外部より何らかの手段で、を力をオフ
した時の位置ずれを防止する。
(2) Use some external means to prevent positional deviation when power is turned off to a step motor whose static torque and detent torque have different stable points.

〔発明の目的〕[Purpose of the invention]

本発明の目的は静止トルクとディーテン)トA−りの安
定点の異るステップモータについて、電力オフ時の磁気
ヘッドの位置ずれを防止する手段を加えて瞥込み読み出
しの支障をなくする装置を提供することにある。
The object of the present invention is to provide a device that eliminates trouble in glance reading by adding a means to prevent the positional deviation of the magnetic head when the power is turned off for a step motor having different stable points of static torque and detent. It is about providing.

〔発明の概要〕[Summary of the invention]

けてステップモータの亀カオフ時にも磁気ヘッドの位置
ずれを防止することにある。第4図によシ説明する。8
144図においてイ眠気ヘッドを固オfしたキャリッジ
は、M点より上部では静止トルクカーブ上に、M点より
下部ではディープントトルクカーブ上に位置し、M点が
角度変位の最小となる点である。ここでキャリッジにM
点で丁#釣合う摩擦負荷を加えれば第3図に示す角j及
ずれは生じないことになる。この摩擦負荷の範囲もM点
を中央値として上下に均等にLF(t−1)〜IJF(
ト)とすれば良い。
The purpose of the present invention is to prevent the magnetic head from shifting its position even when the step motor is turned off. This will be explained with reference to FIG. 8
In Fig. 144, the carriage with the drowsy head turned off is located on the static torque curve above the M point, and on the deep torque curve below the M point, and the M point is the point where the angular displacement is the minimum. be. M on the carriage here
If a frictional load that is balanced at the point J is applied, the angle j and deviation shown in FIG. 3 will not occur. The range of this frictional load is also equally distributed upward and downward from LF(t-1) to IJF(
g).

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

本発明の実施例を第5図及び第6図により説明する。 An embodiment of the present invention will be explained with reference to FIGS. 5 and 6.

第5図はガイドシャフト5にメタルスリーブ6を介して
板バネ7をキャリッジ2に取りつけたものであシ、板バ
ネ7のバネ力でメタルスリーブ6がガイドシャフト5と
の間に摩擦力を生じる方法である。板バネのバネ力を適
当に設定することで第4図のM点に相当する摩擦負荷を
生じさせることができる。
In FIG. 5, a plate spring 7 is attached to the guide shaft 5 via a metal sleeve 6 to the carriage 2, and the spring force of the plate spring 7 generates a frictional force between the metal sleeve 6 and the guide shaft 5. It's a method. By appropriately setting the spring force of the leaf spring, a frictional load corresponding to point M in FIG. 4 can be generated.

第6図はバネの形状を変えた実施例である。FIG. 6 shows an embodiment in which the shape of the spring is changed.

板バネの代わりにゴムをメタルスリーブとキャリジの間
に介在させても同様の効果がある。
A similar effect can be obtained by interposing rubber between the metal sleeve and the carriage instead of the leaf spring.

〔発明の効果〕〔Effect of the invention〕

本発明によれば、ステップモータを通電して磁気ヘッド
の位置決め行った後、電力をオフしても磁気ヘッドの位
置ずれを生じなくする効果がある。
According to the present invention, there is an effect that the positional deviation of the magnetic head does not occur even if the power is turned off after the step motor is energized to position the magnetic head.

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

第1図はステップモータを使用した従来の磁気ヘッド位
置決め装置の要部拡大斜視図、第2図から第4図は静止
トルクとディーテントトルクとの角度変位との関係図、
第5図から第6図は本発明の実施例を示す図である。 1・・・磁気ヘッド、2・・・キャリッジ、3・・・ス
チールベルト、4・・・ステップモータ、5・・・ガイ
ドシャツ予 1 図 矛7図 予5図 7 第匹
FIG. 1 is an enlarged perspective view of the main parts of a conventional magnetic head positioning device using a step motor, and FIGS. 2 to 4 are diagrams showing the relationship between static torque and detent torque and angular displacement.
5 to 6 are diagrams showing embodiments of the present invention. DESCRIPTION OF SYMBOLS 1... Magnetic head, 2... Carriage, 3... Steel belt, 4... Step motor, 5... Guide shirt 1 Figure 7 Figure 5 Figure 7 No.

Claims (1)

【特許請求の範囲】 1゜磁気ヘッドと磁気ヘッドを固着したキャリッジと、
キャリッジの移動するガイドシャフトと、キャリッジに
取付けたスチールベルトと、スチールベルトを介してキ
ャリッジを移動させるステップモータと、ガイドシャフ
トを頁通させたメタルスリーブと、メタルスリーブとキ
ャリッジの間にバネ力を持たせる板バネとで構成された
ことを特徴とする磁気ヘッドの位置決め装置。 2゛、板バネの代わシにゴムを用いたことを特徴とする
特許a請求の範囲第1項記載の磁気ヘッド位置決め装置
[Claims] A 1° magnetic head, a carriage to which the magnetic head is fixed,
A guide shaft that moves the carriage, a steel belt attached to the carriage, a step motor that moves the carriage via the steel belt, a metal sleeve through which the guide shaft passes, and a spring force between the metal sleeve and the carriage. 1. A magnetic head positioning device comprising a plate spring to be held. 2. The magnetic head positioning device according to claim 1, characterized in that rubber is used in place of the leaf spring.
JP18158183A 1983-09-28 1983-09-28 Positioning device of magnetic head Pending JPS6074163A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18158183A JPS6074163A (en) 1983-09-28 1983-09-28 Positioning device of magnetic head

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18158183A JPS6074163A (en) 1983-09-28 1983-09-28 Positioning device of magnetic head

Publications (1)

Publication Number Publication Date
JPS6074163A true JPS6074163A (en) 1985-04-26

Family

ID=16103306

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18158183A Pending JPS6074163A (en) 1983-09-28 1983-09-28 Positioning device of magnetic head

Country Status (1)

Country Link
JP (1) JPS6074163A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04147473A (en) * 1990-10-09 1992-05-20 Matsushita Electric Ind Co Ltd Head transfer device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5029009A (en) * 1973-07-18 1975-03-24
JPS56117373A (en) * 1980-02-16 1981-09-14 Pioneer Electronic Corp Linear tracking arm assembly

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5029009A (en) * 1973-07-18 1975-03-24
JPS56117373A (en) * 1980-02-16 1981-09-14 Pioneer Electronic Corp Linear tracking arm assembly

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04147473A (en) * 1990-10-09 1992-05-20 Matsushita Electric Ind Co Ltd Head transfer device

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