JPH02236868A - Recording and reproducing device - Google Patents

Recording and reproducing device

Info

Publication number
JPH02236868A
JPH02236868A JP5610789A JP5610789A JPH02236868A JP H02236868 A JPH02236868 A JP H02236868A JP 5610789 A JP5610789 A JP 5610789A JP 5610789 A JP5610789 A JP 5610789A JP H02236868 A JPH02236868 A JP H02236868A
Authority
JP
Japan
Prior art keywords
coil
center
carriage
recording
scale
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
JP5610789A
Other languages
Japanese (ja)
Inventor
Shigeru Takekado
竹門 茂
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.)
Toshiba Corp
Original Assignee
Toshiba 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 Toshiba Corp filed Critical Toshiba Corp
Priority to JP5610789A priority Critical patent/JPH02236868A/en
Publication of JPH02236868A publication Critical patent/JPH02236868A/en
Pending legal-status Critical Current

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Abstract

PURPOSE:To perform high speed access and high accurate positioning by disposing a center of gravity G of a carriage in mass, a center C of a coil in effective winding and a position detecting point P of a position detecting means to be at acute anglePGC<90 deg.. CONSTITUTION:The carriage 4 is moved on guides 2 and 3 by interaction be tween a current of the coil 18 and a permanent magnet 21. In this case, the center of gravity G of the carriage system is in between the coil 18 and a fixed part 14, whereas dislocation of C at the center C of the effective winding of the coil 18 where a center of generating driving force is located and G is small, and the coil 18 and a linear scale 25 are positioned approximately on the same plane. When a point of intersection (position detecting point) P of a light beam of a scale sensor 26 and the linear scale 25 is disposed in 1st and 4th quadrants, resulting in acute anglePGC<90 deg. around the center G clockwise, the points P and C are revolved with the same phase. Then, when the disposition is made at acute anglePGC>90 deg., beta>alpha is set up so that the positioning accuracy of the scale 25 becomes beta/alpha times to be fed back, thus enabling the accurate positioning.

Description

【発明の詳細な説明】 〔発明の目的〕 (産業上の利用分野) 本発明は記録再生装置に関する. (従来の技術) 近年,フロッピーディスク装置などの記録再生装置の大
容量化に対する要望が高まっており、最近の開発の結果
としてトラック密度を向上させることが可能となってき
た. 第7図に従来の記録再生装置の一例として磁気記録再生
装置を示す.平行に並設されたリニアガイド61とスク
リュー軸62に挿通または螺合した滑り軸受部63. 
64とスクリューナット部65を有する被駆動体である
キャリッジ66には,板パネ67を介して固定部68と
接続されたS1アーム69が設けられる.S1アーム6
9とキャリッジ66の間には、図示しないアクチュエー
タによって所定の周速で回転ずる可撓性磁気円板が位置
しており、SLアーム69とキャリッジ66に固着した
,トランスデューサであるS1ヘッド及びSOヘッド(
共に図示せず)によって扶持されている.そしてステッ
ピングモータ70によりスクリュー軸62が回転するこ
とにより、キャリッジ66が可撓性磁気円板の半径方向
に駆動され、回転する可撓性磁気円板の周方向に対し.
51ヘッド及びSOヘッドが両面記録再生を行う. このような磁気記録再生装置は標準的なフロッピーディ
スク装置の構成を示すものである.しかしS1ヘッドの
位置決め精度がステッピングモータ70の位置決め精度
に依っているため,記録密度をあまり大きくすることが
できない.また.81ヘッドの移動速度もステッピング
モータ70の移動速度に依っているため、アクセス速度
を上げることができない.また3点支持の内の1点に、
位置決めを行うステッピングモータ70が接続している
ため、組立て精度が要求される. 第8図は従来の記録再生装置の一例である光ディスク装
置を示す斜視図である。ボールベアリングあるいは滑り
軸受部がリニアガイド71. 72と摺動するように駆
動されるキャリッジ73には、ここでは図示しない光デ
ィスクに対して情報の記録や再生を行うトランスデュー
サである光ピックアップ74が搭載される。また、キャ
リッジ73の両端にはコイル75、及びリニアスケール
76が設けられている,コイル75番こはその周囲に構
成された磁気回路77によって磁場が与えられることに
より、貫通したセンターヨーク78に沿ってキャリッジ
73を駆動する.リニアスケール76はキャリッジ73
の駆動による位置の情報をスケールセンサ79に与え、
これにより光ピックアップ74の位置制御を行う.そし
て,スピンドルモータ80に固定された光ディスクが回
転することにより,光ディスクの周方向に対し、光ピッ
クアップ74が記録再生を行う.このような光ディスク
装置では駆動手段としてコイル75と磁気回路77とか
らなるボイスコイルモー夕を用いているため、前述した
ステッピングモータに比べて高密度記録,アクセス速度
の向上が可能となる.しかしここではキャリッジ系の重
心はキャリッジ73の中心付近にあるため、キャリッジ
系とリニアガイド71.72の剛性により生じる重心回
りの共振により,リニアスケール76とコイル75は逆
相に回転する.このため、重心回りの共振周波数で伝達
特性に大きなピークが生じ・、位置決めサーボ系が不安
定になりやすい.このため、アクセス時過渡応答が生じ
やすくアクセス速度が上げづらい.また,フィードバッ
クゲインも上げられないため,位置決め精度が上がらず
、高密度化ができなかったり外乱によりキャリッジが動
かされやすいなどの欠点を持っている. また、光ピックアップを磁気ヘッドに変えた型式のフロ
ッピーディスク装置もあるが,上述した欠点と同じ欠点
を持っている. (発明が解決しようとする課題) 以上のように従来の記録再生装置においては、キャリッ
ジ系とリニアガイドの剛性により生じる重心回りの共振
により、スケールセンサと駆動コイルは逆相に回転し,
それに伴い高速アクセスや高精度の位置決めが困難であ
った.本発明は前述した重心回りの共振を極力抑え、高
速アクセスや高精度の位置決めを可能とする記録再生装
置の提供を目的とする. 〔発明の構成〕 (課題を解決するための牟段) 上記の目的を達成するために本発明においては、記録媒
体に対し情報の記録や再生を行うトランスデューサと、 少なくともトランスデューサを搭載するキャリッジと, キャリッジに取付けたコイルに磁場を与える磁気回路と
、 キャリッジの位置を検出する位置検出手段とを有する記
録再生装置において、 キャリッジの質量重心をG、 コイルの有効巻線部の中心をC、 位置検出手段の位置検出点をP とするとき, (lPGc) < 90° が成立つように構成した。
[Detailed Description of the Invention] [Object of the Invention] (Field of Industrial Application) The present invention relates to a recording/reproducing device. (Prior Art) In recent years, there has been an increasing demand for higher capacity recording and reproducing devices such as floppy disk drives, and recent developments have made it possible to increase track density. Figure 7 shows a magnetic recording and reproducing device as an example of a conventional recording and reproducing device. A sliding bearing portion 63 inserted or screwed into the linear guide 61 and the screw shaft 62 arranged in parallel.
A carriage 66 which is a driven body having a screw nut portion 64 and a screw nut portion 65 is provided with an S1 arm 69 connected to a fixed portion 68 via a plate panel 67. S1 arm 6
9 and the carriage 66 is located a flexible magnetic disk that rotates at a predetermined circumferential speed by an actuator (not shown), and the S1 head and SO head, which are transducers, are fixed to the SL arm 69 and the carriage 66. (
(both not shown). When the screw shaft 62 is rotated by the stepping motor 70, the carriage 66 is driven in the radial direction of the flexible magnetic disc, and the carriage 66 is driven in the circumferential direction of the rotating flexible magnetic disc.
51 head and SO head perform double-sided recording and playback. This type of magnetic recording/reproducing device shows the configuration of a standard floppy disk device. However, since the positioning accuracy of the S1 head depends on the positioning accuracy of the stepping motor 70, the recording density cannot be increased very much. Also. Since the moving speed of the 81 head also depends on the moving speed of the stepping motor 70, the access speed cannot be increased. Also, one of the three points of support,
Since a stepping motor 70 for positioning is connected, assembly accuracy is required. FIG. 8 is a perspective view showing an optical disc device, which is an example of a conventional recording/reproducing device. The ball bearing or sliding bearing part is the linear guide 71. An optical pickup 74, which is a transducer for recording and reproducing information on and from an optical disc (not shown), is mounted on a carriage 73 that is driven to slide with the optical disc 72. Further, a coil 75 and a linear scale 76 are provided at both ends of the carriage 73. Coil No. 75 is applied with a magnetic field by a magnetic circuit 77 configured around the coil No. 75, so that the coil No. 75 is applied along the penetrating center yoke 78. to drive the carriage 73. The linear scale 76 is the carriage 73
gives information on the position caused by the drive to the scale sensor 79;
This controls the position of the optical pickup 74. As the optical disk fixed to the spindle motor 80 rotates, the optical pickup 74 performs recording and reproduction in the circumferential direction of the optical disk. Since such an optical disk device uses a voice coil motor consisting of a coil 75 and a magnetic circuit 77 as a driving means, it is possible to achieve higher density recording and improve access speed compared to the above-mentioned stepping motor. However, here, since the center of gravity of the carriage system is located near the center of the carriage 73, the linear scale 76 and the coil 75 rotate in opposite phases due to resonance around the center of gravity caused by the rigidity of the carriage system and linear guides 71 and 72. For this reason, a large peak occurs in the transfer characteristics at the resonance frequency around the center of gravity, and the positioning servo system tends to become unstable. For this reason, transient responses tend to occur during access, making it difficult to increase access speed. In addition, since the feedback gain cannot be increased, the positioning accuracy cannot be improved, and there are disadvantages such as the inability to achieve high density and the carriage being easily moved by disturbances. There is also a type of floppy disk device that replaces the optical pickup with a magnetic head, but it has the same drawbacks as mentioned above. (Problems to be Solved by the Invention) As described above, in the conventional recording/reproducing device, the scale sensor and the drive coil rotate in opposite phases due to resonance around the center of gravity caused by the rigidity of the carriage system and linear guide.
As a result, high-speed access and high-precision positioning were difficult. The present invention aims to provide a recording/reproducing device that suppresses the resonance around the center of gravity as much as possible, and enables high-speed access and highly accurate positioning. [Structure of the Invention] (Steps for Solving the Problem) In order to achieve the above object, the present invention provides a transducer for recording and reproducing information on a recording medium, a carriage on which at least the transducer is mounted, In a recording/reproducing device that has a magnetic circuit that applies a magnetic field to a coil attached to a carriage, and a position detection means that detects the position of the carriage, the center of mass of the carriage is G, the center of the effective winding of the coil is C, and the position is detected. When the position detection point of the means is P, it is configured so that (lPGc) < 90° holds true.

(作用) 上記のように構成することにより,第6図(b)に示す
ように重心まわりの共振が発生しても位置検出点には必
ずコイルと同じ向きのベクトル成分が発生するため、コ
イルと位置検出手段が逆相に回転することがなくなる。
(Function) With the above configuration, even if resonance occurs around the center of gravity as shown in Figure 6(b), a vector component in the same direction as the coil is always generated at the position detection point, so the coil This prevents the position detection means from rotating in the opposite phase.

従って高速アクセスや高精度の位置決めが可能な記録再
生装霞が実現する。
Therefore, a recording/reproducing device capable of high-speed access and high-precision positioning is realized.

(実施例) 以下、図面を参照して本発明を説明する。(Example) The present invention will be described below with reference to the drawings.

第1図は本発明に係る記録再生装置の斜視図,第2図は
磁気回路とスケールセンサを除いた部分の斜視図、第3
図は平面図、第4図は正面図、第5図は側面図である.
可撓性磁気円板1に向って平行に固定された2本のリニ
アガイド2,3は断面円形状をなし、各種部品を具備し
たキャリッジ4が摺動しながらリニアガイド2,3の軸
方向に運動可能となっている.摺動部分は3か所あり,
軸受部5,6は嵌挿孔7,8が前記リニアガイド2の断
面形状と略同形状をなし、このリニアガイド2と摺動を
行う.また軸受部9は第5図に示すように略コの字形状
をなし、前記リニアガイド3を2方向から扶持するよう
に摺動を行う。これにより軸受部5,6とリニアガイド
2はキャリッジ4のy方向と2方向の運動を規制し、ま
た軸受部9とリニアガイド3はキャリッジ4の2方向の
運動を規制する。こては図示しないが、これら軸受部5
,6.9の摺動面には、固体または液体により潤滑され
るような処理が施されてもよい。
FIG. 1 is a perspective view of a recording/reproducing apparatus according to the present invention, FIG. 2 is a perspective view of a portion excluding a magnetic circuit and a scale sensor, and FIG.
The figure is a plan view, Figure 4 is a front view, and Figure 5 is a side view.
Two linear guides 2 and 3 fixed in parallel toward the flexible magnetic disc 1 have a circular cross section, and a carriage 4 equipped with various parts slides in the axial direction of the linear guides 2 and 3. It is now possible to exercise. There are three sliding parts,
The bearings 5 and 6 have insertion holes 7 and 8 having substantially the same cross-sectional shape as the linear guide 2, and slide on the linear guide 2. Further, the bearing portion 9 has a substantially U-shape as shown in FIG. 5, and slides so as to support the linear guide 3 from two directions. As a result, the bearings 5 and 6 and the linear guide 2 restrict the movement of the carriage 4 in the y direction and two directions, and the bearing 9 and the linear guide 3 restrict the movement of the carriage 4 in the two directions. Although the iron is not shown, these bearing parts 5
, 6.9 may be treated to be lubricated with solid or liquid.

キャリッジ4のリニアガイド2と隣接する位五には、可
撓性磁気円板1に対して情報の記録・再生を行うための
トランスデューサであるSOヘッド10及びS1ヘッド
l1が設けられる。SOヘッド10はキャリッジ4から
直接突出したSOアーム12に固定され,可撓性磁気円
板1の裏面の記録・再生を行う.また、可撓性磁気円板
1の表面の記録・再生を行うS1ヘッド11はS1アー
ムl3に固定されるが、この81アーム13は固定部1
4にてネジ15,16により圧着された薄板バネからな
るヒンジ17と接続しており、可撓性磁気円板1が両ヘ
ッド10,l1間に挿入されるときにS1ヘッド1を2
方向へ退避させることができるようになっている.キャ
リッジ4のリニアガイド3と隣接する位置には、ボイス
コイルモータを形成する矩形のコイル18があり,キャ
リッジ4の一部であるコイル取り付け部19にその巻回
方向がリニアガイド2,3と直角に なるように取り付
けられている.このコイル取り付け部19は、コイル1
8の厚みと略同一の厚みを有する薄板からなる4つの梁
により構成されている.そしてキャリッジ4の外部に固
設された矩形のヨーク20と,このヨーク20内の上部
に固着した永久磁石21とからなる磁気回路より磁場を
与えられている.尚、永久磁石2工はコイルl8方向に
着磁されている.ここで前記ヨーク20の下底部22は
コイル18の巻装中心に挿通されており,永久磁石21
とヨーク20の下底部22とにより形成される磁気ギャ
ップ内に,コイル18の有効巻線部を1つ有した構成を
なしている.このようにキャリッジ4をリニアガイド2
,3の軸方向に駆動するための駆動力を得ることによっ
て,前記トランスデューサが可撓性磁気円板1の半径方
向に沿って移動される. 一方、やはりリニアガイド3に隣接する位置であり,リ
ニアガイド3を挟んで前記コイル18と反対側には、キ
ャリッジ4の一部である前記梁に対し、ネジ23. 2
4によってリニアスケール25が固定されている.この
リニアスケール25にはリニアガイド2,3の軸方向と
直角な方向に同一ピッチのスリットが多数本形成されて
おり、コイル18の有効巻線部と略同一平面上に前記ス
リットが位置するようになっている.キャリッジ4の外
部に固設されたスケールセンサ26は第1図に示すよう
にコの字形状をなし、その溝部にてリニアスケール25
を挟み込むような状態に位置している.これらリニアス
ケール25及びスケールセンサ26は光学式センサであ
り、スケールセンサ26に設けられた発光部、受光部、
及び同一ピッチのスリットが形成された固定マスク部(
共に図示せず)によってリニアスケール25を通過する
光の強弱を判断する.これら位置検出手段の位匝検出点
は、スケールセンサ26が発する光ビームとリニアスケ
ール25との交点であり、そして得られた位置情報をコ
イル18にフィードバックすることにより位置決めサー
ボ系を構成し、キャリッジ4に設けられた前記トランス
ジューサを所定の位置に位置決めする.以上のように構
成された記録再生装置においては、コイル18への通電
動作に伴い、コイルl8に流れる電流と永久磁石2lか
ら発生する磁束とからりニアガイド2,3の軸方向への
駆動力が発生する.そしてリニアガイド2,3の延長方
向に位置する可撓性磁気円板1の半径方向に沿って、ト
ランスデューサなどを搭載したキャリッジ4が駆動され
る。このようにして可撓性磁気円板の任意の位置でSO
ヘッド10とSlヘッド11が可撓性磁気円板1と摺動
可能の状態になると.SOヘッドlO及びS1ヘッドl
1による情報の記録・再生が行われる.SOヘッド10
及びS1ヘッド1lの位置決めはリニアスケール25及
びスケールセンサ26を用いて行われる. 一般に位置決めに位置情報と駆動モータを用い位置決め
サーボ系でキャリッジの位置決めを行う系では、キャリ
ッジの重心回りの回転モードの共振で位置決めサーボ系
が不安定になる場合がある.重心回りの回転により伝達
特性に大きなピークや位相ずれが生じると、位置決めサ
ーボ系が不安定になり発振したりする.または,フィー
ドバックゲインが大きくできないため位置決めエラーが
大きくなり高密度化できなかったり、外乱振動に対して
大きく振動してしまうなどの不都合を生じる.ここで重
心回りの回転モードは,平面図上の回転モードと正面図
上の回転モードの2つのモードが問題となるので,これ
を避けるために本発明では,各モードにつき位置情報を
検出する位置と駆動力を発生する位置を同じ側にし、重
心位置のそばに駆動源を配置した.また.共振周波数を
高くして安定性を増すために,軸受剛性に対して回転質
量をできるだけ小さくした. つまり本発明では,キャリッジ系の重心は第3図の平面
図でコイル18と固定部14の間にあり,第4図の正面
図ではコイル(図示せず)の有効巻線部の付近にある.
そして,駆動力発生の中心はコイル18の有効巻線部の
中心にある.また平面的には、コイル18とリニアスケ
ール25がキャリッジ系の重心に対し同一方向にあり、
その間隔(ずれ量)は小さい.従って重心回りの共振の
発生に伴いコイルl8とリニアスケール25は同位相で
回転し,しかもその位相ずれが生じづらく共振モードの
伝達ゲインも比較的小さい.第4図の正面図で見ると重
心位置と駆動力発生の中心位置のずれが小さく,しかも
コイルl8とリニアスケール25とはほとんど同一平面
上にあるため、重心回りの共振の発生による位置決めサ
ーボ系の不安定はほとんど発生しない。
At a position adjacent to the linear guide 2 of the carriage 4, an SO head 10 and an S1 head l1, which are transducers for recording and reproducing information on the flexible magnetic disk 1, are provided. The SO head 10 is fixed to an SO arm 12 that directly protrudes from the carriage 4, and performs recording and reproduction on the back side of the flexible magnetic disk 1. Further, the S1 head 11 for recording and reproducing the surface of the flexible magnetic disk 1 is fixed to the S1 arm l3, and this 81 arm 13 is connected to the fixed part 1.
4 is connected to a hinge 17 made of a thin plate spring crimped by screws 15 and 16, and when the flexible magnetic disc 1 is inserted between both heads 10 and l1, the S1 head 1 is
It is now possible to evacuate in any direction. A rectangular coil 18 forming a voice coil motor is located at a position adjacent to the linear guide 3 of the carriage 4, and its winding direction is perpendicular to the linear guides 2 and 3 at a coil mounting portion 19 that is a part of the carriage 4. It is installed so that This coil attachment part 19 is attached to the coil 1
It is made up of four beams made of thin plates with approximately the same thickness as 8. A magnetic field is applied to the carriage 4 by a magnetic circuit consisting of a rectangular yoke 20 fixed to the outside of the carriage 4 and a permanent magnet 21 fixed to the upper part of the yoke 20. The two permanent magnets are magnetized in the direction of coil l8. Here, the lower bottom part 22 of the yoke 20 is inserted through the center of the winding of the coil 18, and the permanent magnet 21
The configuration has one effective winding portion of the coil 18 within the magnetic gap formed by the lower bottom portion 22 of the yoke 20. In this way, move the carriage 4 to the linear guide 2.
, 3, the transducer is moved along the radial direction of the flexible magnetic disk 1. On the other hand, at a position also adjacent to the linear guide 3 and on the opposite side of the coil 18 with the linear guide 3 in between, there is a screw 23. 2
4, the linear scale 25 is fixed. A large number of slits with the same pitch are formed in the linear scale 25 in a direction perpendicular to the axial direction of the linear guides 2 and 3, so that the slits are located on substantially the same plane as the effective winding portion of the coil 18. It has become. The scale sensor 26 fixedly installed outside the carriage 4 has a U-shape as shown in FIG.
It is located in such a way that it is sandwiched between the two. These linear scale 25 and scale sensor 26 are optical sensors, and the scale sensor 26 has a light emitting part, a light receiving part,
and a fixed mask part in which slits of the same pitch are formed (
(both not shown) determines the strength of the light passing through the linear scale 25. The position detection point of these position detection means is the intersection of the light beam emitted by the scale sensor 26 and the linear scale 25, and by feeding back the obtained position information to the coil 18, a positioning servo system is configured, and the carriage The transducer provided at 4 is positioned at a predetermined position. In the recording/reproducing device configured as described above, as the coil 18 is energized, the driving force in the axial direction of the near guides 2 and 3 is generated by the current flowing through the coil l8 and the magnetic flux generated from the permanent magnet 2l. Occur. A carriage 4 carrying a transducer and the like is driven along the radial direction of the flexible magnetic disc 1 located in the direction in which the linear guides 2 and 3 extend. In this way, the SO at any position on the flexible magnetic disk
When the head 10 and the Sl head 11 are in a state where they can slide on the flexible magnetic disk 1. SO head lO and S1 head l
Information is recorded and played back by 1. SO head 10
The positioning of the S1 head 1l is performed using a linear scale 25 and a scale sensor 26. Generally, in a system that uses position information and a drive motor for positioning and uses a positioning servo system to position the carriage, the positioning servo system may become unstable due to resonance in the rotation mode around the center of gravity of the carriage. If a large peak or phase shift occurs in the transfer characteristics due to rotation around the center of gravity, the positioning servo system becomes unstable and may oscillate. Alternatively, since the feedback gain cannot be increased, the positioning error becomes large, resulting in inconveniences such as not being able to achieve high density, or causing large vibrations in response to external vibrations. Here, the two modes of rotation around the center of gravity are problematic: the rotation mode on the plan view and the rotation mode on the front view.In order to avoid this, in the present invention, the position information is detected for each mode. The driving force was generated on the same side, and the driving source was placed near the center of gravity. Also. In order to raise the resonance frequency and increase stability, the rotating mass was made as small as possible relative to the bearing rigidity. In other words, in the present invention, the center of gravity of the carriage system is located between the coil 18 and the fixed part 14 in the plan view of FIG. 3, and is located near the effective winding part of the coil (not shown) in the front view of FIG. ..
The center of driving force generation is located at the center of the effective winding portion of the coil 18. In addition, in plan view, the coil 18 and the linear scale 25 are in the same direction with respect to the center of gravity of the carriage system,
The interval (amount of deviation) is small. Therefore, with the occurrence of resonance around the center of gravity, the coil l8 and the linear scale 25 rotate in the same phase, and moreover, their phase shift is less likely to occur, and the transmission gain of the resonance mode is also relatively small. As seen in the front view of Fig. 4, the deviation between the center of gravity and the center of driving force generation is small, and since the coil l8 and the linear scale 25 are almost on the same plane, the positioning servo system is caused by resonance around the center of gravity. instability rarely occurs.

今、コイル18の有効巻線部の中心をC,キャリッジ系
の重心をGとする.そして第6図(a)に示すうなX−
Y座標系のX軸上にCを、原点上にGを配置する.この
ようにした場合、本発明に係る記録再生装置ではスケー
ルセンサ26が発する光ビームとリニアスケール25と
の交点PC位置検出点)が、同図(a)の第1及び第4
象限内に位置するように配置されている.これは同図(
b)に示すように,Gを中心としてX−Y座標系の時計
回りの回転を考えた場合、第1及び第4象限内の点は必
ず単位ベクトルVと同じ向きのベクトル成分を有するた
めである.つまり、zpacが901より小さい角度で
あればCと逆相に回転することがなく、必ず同位相で回
転する。尚,ここではX−Y座標系はa,c,pを含む
平面を基準にした座標系であるが本実施例では第3図に
示すx−y座標系、第4図に示すx−z座標を基準にし
た場合を考えても、共に上記のような配置となっている
.また、第6図(b)に示すようにCよりPの方がX座
標が大きくなるように、っまりlPcGが90″より大
きくなるように配置するとβ〉αの関係が成立つ.この
ため、例えばY軸とスリットが直交するようにリニアス
ケール25を取付ければ、リニアスケール25で得られ
た位置決め精度は、コイル18ニ(β/α)倍の精度と
なってフィードバックされ,より正確な位置決めが可能
となる.尚、トランスデューサの中心をTとすると、本
実施例においてはキャリッジ4の駆動方向と直角な方向
、つまりリニアガイド2,3の軸方向と直角な方向に仮
想平面を考えた場合、前記T,C,Pを含む平面との交
線上(X軸上)にこれらT,C,PがT−C−Pの順に
投影されるように構成されている.こういった構成とす
るためにはキャリッジ4に特に質量の偏りなどが無い限
り、第3図に示すy軸方向つまり前記仮想平面に沿って
順に、SO及びS1ヘッド10. 11−コイル18−
リニアスケール25と配置することにより容易に実現で
きる.これにより部品の質量の関係から重心GがT−C
間にくるので、第6図(b)に示すようにCとPが同じ
向きのベクトル成分を有するようになる。そしてやはり
高速アクセスや高精度の位置決めが可能な記録再生装置
となる. また、平面的に見てキャリッジ系の大半の構成物が3つ
の軸受部5,6.9の内部に配置されており、安定性の
よい配置となっている.これは軸受剛性に対し回転慣性
が小さいことを示しており,回転モードの共振周波数が
高くなり安定性が増すとともに、軸受の耐久性も良くす
る効果がある。
Now, let C be the center of the effective winding part of the coil 18, and G be the center of gravity of the carriage system. And the eel X- shown in Figure 6(a)
Place C on the X axis of the Y coordinate system and G on the origin. In this case, in the recording and reproducing apparatus according to the present invention, the intersection point PC position detection point between the light beam emitted by the scale sensor 26 and the linear scale 25 is the first and fourth points in FIG.
It is arranged so that it is located within the quadrant. This is the same figure (
As shown in b), when considering the clockwise rotation of the X-Y coordinate system with G as the center, the points in the first and fourth quadrants always have a vector component in the same direction as the unit vector V. be. That is, if zpac is an angle smaller than 901, it will not rotate in the opposite phase to C, but will always rotate in the same phase. Note that here, the X-Y coordinate system is a coordinate system based on a plane including a, c, and p, but in this embodiment, the x-y coordinate system shown in FIG. 3 and the x-z coordinate system shown in FIG. Even when considering the case based on the coordinates, the arrangement is as shown above. Furthermore, as shown in Fig. 6(b), if P is arranged so that the X coordinate is larger than C, so that lPcG is larger than 90'', the relationship β>α is established.For this reason, For example, if the linear scale 25 is installed so that the Y-axis and the slit are perpendicular to each other, the positioning accuracy obtained with the linear scale 25 will be fed back to the coil 18 with an accuracy twice (β/α), resulting in more accurate positioning. Positioning becomes possible.If the center of the transducer is T, then in this embodiment, a virtual plane is considered in a direction perpendicular to the driving direction of the carriage 4, that is, a direction perpendicular to the axial direction of the linear guides 2 and 3. In this case, the configuration is such that these T, C, and P are projected in the order of T-C-P on the intersection line (on the X axis) with the plane containing the above-mentioned T, C, and P. In order to do this, as long as there is no particular mass deviation in the carriage 4, the SO and S1 heads 10, 11-coil 18- are sequentially moved in the y-axis direction shown in FIG.
This can be easily achieved by arranging it with the linear scale 25. As a result, the center of gravity G is T-C due to the mass of the parts.
Therefore, as shown in FIG. 6(b), C and P have vector components in the same direction. After all, it is a recording/playback device capable of high-speed access and high-precision positioning. Furthermore, when viewed from above, most of the components of the carriage system are arranged inside the three bearings 5, 6.9, resulting in a highly stable arrangement. This indicates that the rotational inertia is small compared to the bearing rigidity, which increases the resonance frequency of the rotational mode, increases stability, and has the effect of improving the durability of the bearing.

特に軸受部9は第5図に示すようにy方向に空間を設け
ることができ、装置組立ての際に軸受部9とリニアガイ
ド3とは2方向のみ精度を注意すればよく,製作が容易
となる。
In particular, the bearing part 9 can be provided with a space in the y direction as shown in Fig. 5, and when assembling the device, the accuracy of the bearing part 9 and the linear guide 3 only needs to be paid attention to in two directions, making it easy to manufacture. Become.

もちろん本発明は上記実施例に限定されるものではなく
,例えば光ディスク装置などの記録再生装置であっても
よい。また、リニアスケール25は必ずしもリニアガイ
ド2.3と平行に配置されていなくてもよい。位置検出
手段は光学式以外に,磁気式や静電式であってもよい. 〔発明の効果〕 以上のように本発明によれば、高速アクセスや高精度の
位置決めが可能な記録再生装置が実現する。
Of course, the present invention is not limited to the above-described embodiment, and may be applied to a recording/reproducing apparatus such as an optical disc apparatus. Moreover, the linear scale 25 does not necessarily have to be arranged parallel to the linear guide 2.3. The position detection means may be magnetic or electrostatic in addition to optical. [Effects of the Invention] As described above, according to the present invention, a recording/reproducing device capable of high-speed access and highly accurate positioning is realized.

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

第1図乃至第5図は本発明の記録再生装置を示す図、第
6図は本発明の記録再生装置の要部の配置を示す図,第
7図乃至第8図は従来の記録再生装置を示す図である。 1・・・可撓性磁気円板(記録媒体) 2,3・・・リニアガイド  4・・・キャリッジ10
. 11・・・ヘッド(トランスデューサ)18・・・
コイル     20・・・ヨーク21・・・永久磁石 25・・・ガイドスケール(位置検出手段)26・・・
スケールセンサ(位置検出手段)代理人 弁理士 則 
近 憲 佑 同  松山允之 y 第1図 y 第 2 図 (a) Y 第 図
1 to 5 are diagrams showing a recording and reproducing device of the present invention, FIG. 6 is a diagram showing the arrangement of main parts of the recording and reproducing device of the present invention, and FIGS. 7 to 8 are diagrams showing a conventional recording and reproducing device. FIG. 1... Flexible magnetic disk (recording medium) 2, 3... Linear guide 4... Carriage 10
.. 11...Head (transducer) 18...
Coil 20...Yoke 21...Permanent magnet 25...Guide scale (position detection means) 26...
Scale sensor (position detection means) agent patent attorney rules
Ken Yudo Chika Masuyuki Matsuyama Figure 1 Figure 2 (a) Figure 2

Claims (2)

【特許請求の範囲】[Claims] (1)記録媒体に対し情報の記録や再生を行うトランス
デューサと、 少なくとも前記トランスデューサを搭載するキャリッジ
と、 前記キャリッジに取付けたコイルに磁場を与える磁気回
路と、 前記キャリッジの位置を検出する位置検出手段とを有す
る記録再生装置において、 前記キャリッジの質量重心をG、 前記コイルの有効巻線部の中心をC、 前記位置検出手段の位置検出点をP とするとき、 (∠PGC)<90゜ となるように構成したことを特徴とする記録再生装置。
(1) A transducer for recording and reproducing information on a recording medium, a carriage on which at least the transducer is mounted, a magnetic circuit that applies a magnetic field to a coil attached to the carriage, and a position detection means for detecting the position of the carriage. In the recording/reproducing device, where the center of mass of the carriage is G, the center of the effective winding portion of the coil is C, and the position detection point of the position detection means is P, (∠PGC)<90°. A recording and reproducing device characterized in that it is configured so that:
(2)請求項1記載の記録再生装置において、(∠PC
G)>90゜ となるように構成したことを特徴とする記録再生装置。
(2) In the recording and reproducing apparatus according to claim 1, (∠PC
G) A recording/reproducing device characterized by being configured such that the angle is greater than 90°.
JP5610789A 1989-03-10 1989-03-10 Recording and reproducing device Pending JPH02236868A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5610789A JPH02236868A (en) 1989-03-10 1989-03-10 Recording and reproducing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5610789A JPH02236868A (en) 1989-03-10 1989-03-10 Recording and reproducing device

Publications (1)

Publication Number Publication Date
JPH02236868A true JPH02236868A (en) 1990-09-19

Family

ID=13017873

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5610789A Pending JPH02236868A (en) 1989-03-10 1989-03-10 Recording and reproducing device

Country Status (1)

Country Link
JP (1) JPH02236868A (en)

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