JP3083583B2 - Swing type actuator - Google Patents
Swing type actuatorInfo
- Publication number
- JP3083583B2 JP3083583B2 JP03103005A JP10300591A JP3083583B2 JP 3083583 B2 JP3083583 B2 JP 3083583B2 JP 03103005 A JP03103005 A JP 03103005A JP 10300591 A JP10300591 A JP 10300591A JP 3083583 B2 JP3083583 B2 JP 3083583B2
- Authority
- JP
- Japan
- Prior art keywords
- permanent magnet
- movable coil
- magnetic
- coil
- magnetic pole
- 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.)
- Expired - Lifetime
Links
- 238000004519 manufacturing process Methods 0.000 description 7
- 230000004907 flux Effects 0.000 description 5
- 238000000465 moulding Methods 0.000 description 5
- 230000001788 irregular Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000005415 magnetization Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052761 rare earth metal Inorganic materials 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 229910052692 Dysprosium Inorganic materials 0.000 description 1
- 229910052779 Neodymium Inorganic materials 0.000 description 1
- 229910052777 Praseodymium Inorganic materials 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
Landscapes
- Reciprocating, Oscillating Or Vibrating Motors (AREA)
Description
【0001】[0001]
【産業上の利用分野】本発明は例えば磁気ディスク用ア
クチュエータのような揺動型アクチュエータに関するも
のであり、特に磁気ヘッドのような機能部材が円弧軌跡
を描くように揺動する揺動型(スイング型)アクチュエ
ータに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oscillating actuator such as an actuator for a magnetic disk, and more particularly to an oscillating actuator in which a functional member such as a magnetic head oscillates in an arc trajectory. Type) actuator.
【0002】[0002]
【従来の技術】従来磁気ディスク等の記録トラックに磁
気ヘッドを位置決めするには、図4および図5に示すよ
うな揺動型若しくは回転式のアクチュエータが使用され
ている。両図においてヨーク1には永久磁石2を固着
し、かつ各々極性を異にして対向配置して支柱3によっ
て組立て、空隙部4を介して磁気回路を形成する。5は
アームであり、一端に偏平型の可動コイル6を、他端に
は磁気ヘッド(図示せず)を各々固着し、可動コイル6
が前記空隙部4内に位置するように、軸7を介して回転
揺動自在に配設する。2. Description of the Related Art Conventionally, an oscillating or rotary actuator as shown in FIGS. 4 and 5 is used to position a magnetic head on a recording track of a magnetic disk or the like. In both figures, a permanent magnet 2 is fixed to a yoke 1 and arranged opposite to each other with different polarities and assembled by a support 3 to form a magnetic circuit via a gap 4. An arm 5 has a flat movable coil 6 fixed to one end and a magnetic head (not shown) fixed to the other end.
Are disposed via the shaft 7 so as to be rotatable and oscillating so as to be positioned in the gap 4.
【0003】而して可動コイル6に信号電流を通電する
と、フレミングの左手の法則に従って可動コイル6に軸
7の回りの駆動力が作用し、アーム5を回転揺動させ、
アーム5に固着した磁気ヘッドを磁気ディスク上の所定
の記録トラックに位置決めするのである。なお回転方向
の切り換えは、コイルへの通電電流の向きを反転させる
ことによって行う。When a signal current is applied to the movable coil 6, a driving force about the shaft 7 acts on the movable coil 6 in accordance with Fleming's left-hand rule, causing the arm 5 to rotate and swing.
The magnetic head fixed to the arm 5 is positioned on a predetermined recording track on the magnetic disk. The rotation direction is switched by reversing the direction of the current flowing through the coil.
【0004】この場合磁気ヘッドの移動を良好に制御す
るためには、可動コイル6に加わる力を可動コイル6の
移動範囲内(例えば可動コイル6の上辺においてはθ1
〜θ 2 )において均一にして磁気ヘッド速度をその位置
に無関係に均一にする必要がある。このため従来におい
ては、永久磁石2の可動コイル6に対する磁束密度分布
を均一にするために、可動コイル6の幅に対して永久磁
石2の幅を充分に大きくし、可動コイル6の移動範囲を
永久磁石2の中央部分のみとしていた。従って永久磁石
2が必然的に大となり、重量が増大し、装置が大型化す
るという欠点があった。In this case, the movement of the magnetic head is controlled well.
In order to achieve this, the force applied to the movable coil 6 is
Within the moving range (for example, θ1
~ Θ Two) To make the magnetic head speed at that position
Need to be uniform regardless of For this reason
The magnetic flux density distribution of the permanent magnet 2 with respect to the movable coil 6
In order to make the
The width of the stone 2 is made sufficiently large, and the moving range of the movable coil 6 is increased.
Only the central part of the permanent magnet 2 was used. Therefore permanent magnet
2 is inevitably large, increasing the weight and increasing the size of the device.
Had the disadvantage of
【0005】上記の欠点を解消するために、可動コイル
6の円弧軌跡の直角方向についての永久磁石2の長さが
可動コイル6の移動範囲の中央部から外端部に向かって
長くなるように形成する、という内容の提案がされてい
る(特公昭61− 46901号公報参照)。この提案により、
可動コイル6に加わる力を可動コイル6の移動範囲にお
いて均一にできるとしている。In order to solve the above-mentioned drawback, the length of the permanent magnet 2 in the direction perpendicular to the arc trajectory of the movable coil 6 is increased from the center of the moving range of the movable coil 6 toward the outer end. A proposal has been made to form (see Japanese Patent Publication No. 61-46901). With this proposal,
It is stated that the force applied to the movable coil 6 can be made uniform in the moving range of the movable coil 6.
【0006】しかし上記提案は、永久磁石2の平面への
投影輪郭形状を、曲線を有する特殊な形状にする必要が
あり、永久磁石2の成形手順を複雑化し、製造コストを
高めるという問題点がある。上記問題点を解決するため
に、磁気回路のギャップ幅、すなわち永久磁石2とヨー
ク1との空隙部4の幅を、可動コイル6の移動方向に沿
って、永久磁石2の中央部から端部に向かって減ずるよ
うに構成する、という内容の提案がある(特開昭64− 7
7455号公報参照)。この提案により、永久磁石2の形状
を直線で構成することができるため、製造コストを低減
させ得ると共に、可動コイル6の位置に拘らず空隙磁束
密度を均一化し、可動コイル6に加わる力を均一化でき
るとしている。However, the above proposal has a problem that the projection contour of the permanent magnet 2 onto the plane needs to be a special shape having a curved line, which complicates the molding procedure of the permanent magnet 2 and increases the manufacturing cost. is there. In order to solve the above problem, the gap width of the magnetic circuit, that is, the width of the gap 4 between the permanent magnet 2 and the yoke 1 is changed from the center of the permanent magnet 2 to the end along the moving direction of the movable coil 6. There is a proposal that the content be reduced toward
No. 7455). According to this proposal, since the shape of the permanent magnet 2 can be configured as a straight line, the manufacturing cost can be reduced, the air gap magnetic flux density is made uniform regardless of the position of the movable coil 6, and the force applied to the movable coil 6 is made uniform. It can be converted.
【0007】[0007]
【発明が解決しようとする課題】上記提案においては、
何れも永久磁石2および/またはヨーク1の外形形状若
しくは断面形状が曲線を含む異形であるため、それらの
製造が煩雑となり、コスト高となる欠点がある。また近
年におけるこの種の揺動型アクチュエータに対する要求
は次第に厳しさを増してきており、上記可動コイル6に
加わる力の均一化は当然のことながら、より高推力化、
小型化の要請が強くなってきている。SUMMARY OF THE INVENTION In the above proposal,
In any case, since the outer shape or the cross-sectional shape of the permanent magnet 2 and / or the yoke 1 is an irregular shape including a curved line, their production is complicated and the cost is increased. In recent years, the requirements for this type of oscillating actuator have been increasingly strict. Therefore, it is natural that the force applied to the movable coil 6 is made uniform, and the thrust is increased.
The demand for miniaturization is increasing.
【0008】上記高推力化の手段としては、永久磁石2
の高性能化が考えられ、例えば希土類系のものを使用す
ることは当然であるが、この他に横磁場成形品を使用す
ることが有効である。すなわち通常の縦磁場成形品は、
プレス成形方向と磁化容易軸の方向とが同一であるもの
に対して、横磁場成形においては、プレス成形方向に対
して磁化容易軸の方向を直角方向としたものである。こ
のような永久磁石を使用すると推力をより増大できると
されている(例えば特公昭47− 37327号公報参照)。As means for increasing the thrust, a permanent magnet 2
It is natural to use rare earth materials, for example, but it is effective to use transverse magnetic field molded products. That is, a normal vertical magnetic field molded product is
In the transverse magnetic field molding, the direction of the axis of easy magnetization is perpendicular to the direction of the press molding, while the direction of the press molding and the direction of the axis of easy magnetization are the same. It is said that the use of such a permanent magnet can further increase the thrust (see, for example, Japanese Patent Publication No. 47-32727).
【0009】しかしながら上記のような横磁場成形によ
る永久磁石2を使用したものにおいては、リニアリティ
すなわち可動コイル6に加わる力を均一にすることが困
難であると共に、前記特公昭61− 46901号公報記載のも
ののように永久磁石2を異形に成形することが困難であ
るという問題点がある。However, it is difficult to make the linearity, that is, the force applied to the movable coil 6 uniform, in the case of using the permanent magnet 2 formed by the above-described transverse magnetic field, and it is described in Japanese Patent Publication No. 46901/1986. However, there is a problem that it is difficult to form the permanent magnet 2 into an irregular shape as in the case of FIG.
【0010】このため上記異形部分を例えば機械加工に
よって成形することが考えられる。図3はこのようにし
て成形した永久磁石2の例を示す平面図である。図3に
おいて2aは凹部であり、可動コイル6の移動範囲の中
央部に対応する永久磁石2の外縁部およびその近傍に設
けたものである。しかしながら、永久磁石2を成形焼結
した後において凹部2aを加工することは、永久磁石2
が硬質であることと、本質的に脆性であることにより、
凹部2aの加工には多大の時間と工数とを必要とし、製
作コストを高騰させるという問題点がある。[0010] For this reason, it is conceivable to form the deformed portion by, for example, machining. FIG. 3 is a plan view showing an example of the permanent magnet 2 formed as described above. In FIG. 3, reference numeral 2a denotes a concave portion, which is provided at the outer edge of the permanent magnet 2 corresponding to the center of the moving range of the movable coil 6 and in the vicinity thereof. However, processing the concave portion 2a after molding and sintering the permanent magnet 2 requires the permanent magnet 2
Is hard and inherently brittle,
Processing of the concave portion 2a requires a great deal of time and man-hours, and has a problem of increasing the manufacturing cost.
【0011】本発明は上記従来技術に存在する問題点を
解決し、高推力かつ高リニアティ特性を有すると共に、
製作が容易である揺動型アクチュエータを提供すること
を目的とする。The present invention solves the above-mentioned problems in the prior art, has high thrust and high linearity characteristics,
An object of the present invention is to provide an oscillating actuator that is easy to manufacture.
【0012】[0012]
【課題を解決するための手段】上記目的を達成するため
に、本発明においては、対向する1対のヨークの少なく
とも一方に永久磁石を固着し、この永久磁石の表面に磁
気空隙を形成してなるハウジングと、一端に可動コイル
を他端に機能部材を各々固着して揺動自在に形成したア
ームとからなり、前記磁気空隙内に可動コイルを移動自
在に配設して構成した揺動型アクチュエータにおいて、
可動コイルの移動範囲の中央部に対応する永久磁石の外
縁部およびその近傍に、前記磁気空隙を形成する駆動磁
極と逆極性の磁極を設ける、という技術的手段を採用し
た。In order to achieve the above object, according to the present invention, a permanent magnet is fixed to at least one of a pair of opposed yokes, and a magnetic gap is formed on the surface of the permanent magnet. And a swingable arm having a movable coil fixedly attached to one end and a functional member fixed to the other end, the arm being slidably formed, and the movable coil being movably disposed in the magnetic gap. In the actuator,
Technical means is adopted in which a magnetic pole having a polarity opposite to that of the driving magnetic pole forming the magnetic gap is provided at and near the outer edge of the permanent magnet corresponding to the center of the moving range of the movable coil.
【0013】[0013]
【作用】上記の構成により、可動コイルに加わる力を増
大させ得ると共に、リニアリティ特性を向上させ得る。According to the above arrangement, the force applied to the movable coil can be increased and the linearity characteristics can be improved.
【0014】[0014]
【実施例】図1は本発明の実施例を示す要部平面図であ
り、同一部分は前記図3ないし図5と同一の参照符号で
示す。図1において2bは磁極であり、可動コイル6の
移動範囲、すなわち中心角θ1 〜θ2 の中央部に対応す
る永久磁石2の外縁部およびその近傍に、駆動磁極と逆
極性に形成する。例えば駆動磁極がN極であればS極
に、駆動磁極がS極であればN極に形成する。FIG. 1 is a plan view of an essential part showing an embodiment of the present invention, and the same parts are denoted by the same reference numerals as in FIGS. In FIG. 1, reference numeral 2b denotes a magnetic pole, which is formed in the moving range of the movable coil 6, that is, at the outer edge of the permanent magnet 2 corresponding to the center of the central angles θ 1 to θ 2 and in the vicinity thereof, with the polarity opposite to that of the driving magnetic pole. For example, if the driving magnetic pole is an N pole, it is formed as an S pole, and if the driving magnetic pole is an S pole, it is formed as an N pole.
【0015】なお永久磁石2は、例えばR−Fe−B系
(但し、RはNd、Pr、Dy等の希土類元素の1種以
上)磁石材料により、所謂横磁場成形手段によって成形
する。すなわち成形方向(この場合図1において紙面と
直角方向)と直角方向(図1において紙面と平行方向)
に磁場を印加して成形体を作製後,焼結、熱処理、加工
した後、上記磁場印加方向に着磁して形成する。次にこ
の永久磁石2の所定位置(図1における破線の領域内)
に前記駆動磁極と逆極性の補助の磁極2bを着磁する。The permanent magnet 2 is formed of, for example, an R-Fe-B (where R is at least one of rare earth elements such as Nd, Pr, and Dy) magnet material by a so-called transverse magnetic field forming means. That is, a direction perpendicular to the forming direction (in this case, a direction perpendicular to the paper surface in FIG. 1) (a direction parallel to the paper surface in FIG. 1).
After applying a magnetic field to form a molded body, sintering, heat-treating, and processing, the body is magnetized in the above-described magnetic field application direction to be formed. Next, a predetermined position of the permanent magnet 2 (within a region indicated by a broken line in FIG. 1)
Then, an auxiliary magnetic pole 2b having a polarity opposite to that of the driving magnetic pole is magnetized.
【0016】図2は可動コイル6の振れ角θと可動コイ
ル6に加わる力Fとの関係を示す図であり、鎖線は従来
のものを、実線は本発明のものを各々示す。図2から明
らかなように、鎖線にて示す従来のものにおいては、可
動コイル6の移動範囲の両端部、すなわち振れ角θ1 、
θ2 の近傍において可動コイル6に加わる力Fが大幅に
低下し、所謂リニアリティが低いが、実線にて示す本発
明によるものにおいては、振れ角θ1 〜θ2 間に亘って
力Fが均一であり、高リニアリティ特性を示している。FIG. 2 is a diagram showing the relationship between the deflection angle θ of the movable coil 6 and the force F applied to the movable coil 6, wherein a chain line indicates the conventional one and a solid line indicates the one according to the present invention. As is apparent from FIG. 2, in the conventional device shown by the dashed line, both ends of the moving range of the movable coil 6, that is, the deflection angle θ 1 ,
theta force F applied to the moving coil 6 in the vicinity of 2 is significantly reduced, but less so-called linearity, in accordance with the invention shown by the solid line, uniform force over between deflection angle theta 1 through? 2 F is Which indicates high linearity characteristics.
【0017】すなわち、図3に示すものにおいては、可
動コイル6の移動範囲の中央部に対応する永久磁石2の
外縁部およびその近傍に凹部2aを設けて、可動コイル
6の移動範囲の中央部と両端部との空隙磁束密度の均一
化を図ったものである。これに対して本発明のものは、
上記凹部2aに相当する部位に、図1に示すように駆動
磁極と逆極性の補助の磁極を設けることにより、この部
分の磁束の一部を可動コイル6の移動範囲の両端部、す
なわち振れ角θ1 、θ2 の位置に追いやって増加させた
ものである。従って可動コイル6の移動範囲、例えば振
れ角θ1 〜θ2 の如何なる位置においても、空隙磁束密
度を均一にすることができ、可動コイル6に加わる力を
一定にすることができる。That is, in the embodiment shown in FIG. 3, a concave portion 2a is provided at the outer edge of the permanent magnet 2 corresponding to the center of the moving range of the movable coil 6 and in the vicinity thereof, so that the central portion of the moving range of the movable coil 6 is provided. This is to make the air gap magnetic flux density uniform between the two ends. On the other hand, according to the present invention,
By providing an auxiliary magnetic pole having a polarity opposite to that of the driving magnetic pole as shown in FIG. It is increased following the positions of θ 1 and θ 2 . Therefore, the air gap magnetic flux density can be made uniform in the moving range of the movable coil 6, for example, at any position of the deflection angles θ 1 to θ 2 , and the force applied to the movable coil 6 can be made constant.
【0018】本実施例においては、対向するヨーク内面
の一方のみに永久磁石を固着した例について記述した
が、ヨーク内面の両方に永久磁石を固着した構成として
も作用は同様である。In this embodiment, an example has been described in which a permanent magnet is fixed to only one of the inner surfaces of the yoke, but the operation is the same even if a permanent magnet is fixed to both of the inner surfaces of the yoke.
【0019】[0019]
【発明の効果】本発明は以上記述のような構成および作
用であるから、下記の効果を奏し得る。 (1)可動コイルの移動範囲の中央部に対応する永久磁
石の外縁部およびその近傍に、駆動磁極と逆極性の補助
の磁極を設けたことにより、可動コイルの移動範囲にお
ける有効空隙磁束量を均一化し、可動コイルに常に均一
な力を作用させることができる。 (2)永久磁石に横磁場成形品を使用できるため、高推
力が得られ、高速高応答性のアクチュエータが実現でき
る。 (3)永久磁石およびヨークの形状を異形とする必要が
ないため、製造が容易であり、製造コストを低減させ得
る。Since the present invention has the configuration and operation as described above, the following effects can be obtained. (1) By providing auxiliary magnetic poles of opposite polarity to the drive magnetic poles at and near the outer edge of the permanent magnet corresponding to the center of the moving range of the movable coil, the effective air gap magnetic flux in the moving range of the movable coil can be reduced. It is possible to make the moving coil uniform by applying uniform force to the moving coil. (2) Since a transverse magnetic field molded product can be used for the permanent magnet, a high thrust can be obtained, and a high-speed and high-responsive actuator can be realized. (3) Since there is no need to make the permanent magnets and the yoke irregular, the manufacturing is easy and the manufacturing cost can be reduced.
【図1】本発明の実施例を示す要部平面図である。FIG. 1 is a main part plan view showing an embodiment of the present invention.
【図2】可動コイルの振れ角θと可動コイルに加わる力
Fとの関係を示す図である。FIG. 2 is a diagram illustrating a relationship between a deflection angle θ of a movable coil and a force F applied to the movable coil.
【図3】従来の揺動型アクチュエータにおける永久磁石
を示す要部平面図である。FIG. 3 is a main part plan view showing a permanent magnet in a conventional swing type actuator.
【図4】従来の揺動型アクチュエータの例を示す一部破
砕一部断面平面図である。FIG. 4 is a partially broken partial cross-sectional plan view showing an example of a conventional swing type actuator.
【図5】図4におけるA矢視図である。FIG. 5 is a view taken in the direction of arrow A in FIG. 4;
1 ヨーク 2 永久磁石 2b 磁極 6 可動コイル DESCRIPTION OF SYMBOLS 1 Yoke 2 Permanent magnet 2b Magnetic pole 6 Moving coil
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7,DB名) H02K 33/18 ──────────────────────────────────────────────────の Continued on front page (58) Field surveyed (Int. Cl. 7 , DB name) H02K 33/18
Claims (1)
に永久磁石を固着し、この永久磁石の表面に磁気空隙を
形成してなるハウジングと、一端に可動コイルを他端に
機能部材を各々固着して揺動自在に形成したアームとか
らなり、前記磁気空隙内に可動コイルを移動自在に配設
して構成した揺動型アクチュエータにおいて、可動コイ
ルの移動範囲の中央部に対応する永久磁石の外縁部およ
びその近傍に、前記磁気空隙を形成する駆動磁極と逆極
性の磁極を設けたことを特徴とする揺動型アクチュエー
タ。1. A housing having a permanent magnet fixed to at least one of a pair of opposing yokes, a magnetic gap formed on the surface of the permanent magnet, a movable coil at one end, and a functional member at the other end. And a movable coil movably disposed in the magnetic space, wherein the permanent magnet corresponding to the central portion of the movable range of the movable coil is provided. An oscillating actuator, wherein a magnetic pole having a polarity opposite to that of a driving magnetic pole forming the magnetic gap is provided at an outer edge portion and in the vicinity thereof.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP03103005A JP3083583B2 (en) | 1991-05-09 | 1991-05-09 | Swing type actuator |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP03103005A JP3083583B2 (en) | 1991-05-09 | 1991-05-09 | Swing type actuator |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH04334961A JPH04334961A (en) | 1992-11-24 |
JP3083583B2 true JP3083583B2 (en) | 2000-09-04 |
Family
ID=14342548
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP03103005A Expired - Lifetime JP3083583B2 (en) | 1991-05-09 | 1991-05-09 | Swing type actuator |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3083583B2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3347649B2 (en) * | 1997-08-25 | 2002-11-20 | 富士通株式会社 | Magnetic circuit of flat coil type voice coil motor |
-
1991
- 1991-05-09 JP JP03103005A patent/JP3083583B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPH04334961A (en) | 1992-11-24 |
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