JPS5827898B2 - Head positioning mechanism - Google Patents
Head positioning mechanismInfo
- Publication number
- JPS5827898B2 JPS5827898B2 JP13620277A JP13620277A JPS5827898B2 JP S5827898 B2 JPS5827898 B2 JP S5827898B2 JP 13620277 A JP13620277 A JP 13620277A JP 13620277 A JP13620277 A JP 13620277A JP S5827898 B2 JPS5827898 B2 JP S5827898B2
- Authority
- JP
- Japan
- Prior art keywords
- carriage
- positioning mechanism
- magnetic fluid
- head
- guide rail
- 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
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B21/00—Head arrangements not specific to the method of recording or reproducing
- G11B21/02—Driving or moving of heads
Description
【発明の詳細な説明】
この発明は、磁気ディスク装置において所要トラック・
＼ヘッドを位置決めするヘッド位置決め機構に関するち
のである。DETAILED DESCRIPTION OF THE INVENTION The present invention provides a magnetic disk device with a required number of tracks.
This is about the head positioning mechanism that positions the head.
従来、この種の機構は第１図に示すように、ヘッド１を
塔載したキャリッジ２がころがり軸受３を車輪としてガ
イドレール４の上を直進するように構成されていた。Conventionally, as shown in FIG. 1, this type of mechanism has been constructed such that a carriage 2 carrying a head 1 moves straight on a guide rail 4 using rolling bearings 3 as wheels.
駆動力はアクチュ上−夕５により与えられ、ディスク６
の面に記録されている位置信号をヘッド１で検出してフ
ィードバックし。The driving force is given by actuator 5, and disk 6
The head 1 detects the position signal recorded on the surface of the head 1 and feeds it back.
アクチュ上−夕５の駆動力を制御して所要トラック位置
にヘッド１を位置決めしていた。The head 1 is positioned at a desired track position by controlling the driving force of the actuator 5.
このような機構において駆動力の作用方向はキャリッジ
２の進行方向のみであり、位置決め制御は１自由度の系
において行われる。In such a mechanism, the direction of action of the driving force is only in the direction of movement of the carriage 2, and positioning control is performed in a system with one degree of freedom.
しかるにころがり軸受３は、ある値の軸受剛性をもつ弾
性体であり、これによるばねを介してキャリッジ２はガ
イドレール４の上を進行するため、多自由度の振動系を
構成している。However, the rolling bearing 3 is an elastic body having a certain value of bearing rigidity, and since the carriage 2 moves on the guide rail 4 via the spring thereof, it constitutes a vibration system with multiple degrees of freedom.
例えば、駆動力の着力点（図中Ｆ）とキャリッジ２の重
心（図中Ｇ）とが上下方向にずれていたとすると、駆動
力は重心回りのモーメント力を発生し、キャリッジ２は
ピッチング振動をはじめる。For example, if the point of application of the driving force (F in the figure) and the center of gravity of the carriage 2 (G in the figure) are shifted vertically, the driving force will generate a moment force around the center of gravity, and the carriage 2 will experience pitching vibration. Start.
ころがり軸受３には減衰力がほとんど発生しないため、
このような振動はなかなか減衰せず、従来のこの種の位
置決め機構では所望の位置にヘッド１をすみやかに整定
されるのが困難で、位置決め時間の短縮と位置決め精度
の向上の障害となっていた。Since almost no damping force is generated in the rolling bearing 3,
Such vibrations are difficult to attenuate, and with conventional positioning mechanisms of this type, it is difficult to quickly set the head 1 at a desired position, which is an obstacle to shortening positioning time and improving positioning accuracy. .
この発明は、このような有害な振動をすみやかに減衰さ
せるためのダンパをキャリッジに付加し、上記欠点を除
去したものである。The present invention eliminates the above drawbacks by adding a damper to the carriage to quickly dampen such harmful vibrations.
以下図面によってこの発明の詳細な説明する。The present invention will be explained in detail below with reference to the drawings.
第２図はこの発明の一実施例を示す主要部の一部を断面
で表わした拡大側面図であって、１はヘッド（キャリッ
ジ取付部のみ図示）、３はころがり軸受、１１はキャリ
ッジ、１２は前記キャリッジ１１に設けたすべり面、１
３はガイドレール、１４は前記ガイドレール１３に埋設
された永久磁石、１５は磁性流体である。FIG. 2 is an enlarged side view showing a part of the main parts in cross section showing an embodiment of the present invention, in which 1 is a head (only the carriage attachment part is shown), 3 is a rolling bearing, 11 is a carriage, 12 is a sliding surface provided on the carriage 11, 1
3 is a guide rail, 14 is a permanent magnet embedded in the guide rail 13, and 15 is a magnetic fluid.
次にこの動作を説明する。Next, this operation will be explained.
キャリッジ１１は第１図に示した従来のキャリッジ２と
同様ころがり軸受３によって案内されるが、キャリッジ
１１の下拵にはすべり面１２が設けられ、ガイドレール
１３の上面と狭い隙間で対向している。The carriage 11 is guided by a rolling bearing 3 like the conventional carriage 2 shown in FIG. There is.
ガイドレール１３にはすべり函１２に対向する位置に永
久磁石１４が埋設される。A permanent magnet 14 is embedded in the guide rail 13 at a position facing the sliding box 12.
そしてすべり圓１２とガイドレール１３の上面との狭い
隙間には磁は流体１５が充たされる。A narrow gap between the sliding circle 12 and the upper surface of the guide rail 13 is filled with a magnetic fluid 15.
磁性流体１５は永久磁石１４により常にその回りに引き
つげられており、外・＼流出することはない。The magnetic fluid 15 is always drawn around it by the permanent magnet 14 and does not flow out.
位置決め機構はこのように磁性流体１５がすべり面１２
とガイドレール１３の上筒との狭い隙間に充たされてい
るため、ころがり軸受３の弾性変形をはねとする振動が
生じた場合、その振動により、磁性流体１５が充たされ
ている狭い隙間が変化し、磁性流体１５をおし出す、１
１．＜は吸い込む作用をする。In this way, the positioning mechanism is such that the magnetic fluid 15 is placed on the sliding surface 12.
Since the narrow gap between the magnetic fluid 15 and the upper cylinder of the guide rail 13 is filled, when vibration occurs that repels the elastic deformation of the rolling bearing 3, the vibration causes the narrow gap filled with the magnetic fluid 15 to The gap changes and the magnetic fluid 15 is pushed out, 1
1. < has a suction effect.
このとき磁性流体１５は、自らの粘性による絞り膜効果
を発生し、前記隙間の間隔の変化速度に応じた減衰力を
発生する。At this time, the magnetic fluid 15 generates a diaphragm film effect due to its own viscosity, and generates a damping force in accordance with the rate of change in the interval between the gaps.
このため、キャリッジ１１に生じた振動はすみやかに減
衰する。Therefore, vibrations generated in the carriage 11 are quickly attenuated.
このようにこの発明によるヘッド位置決め機構は、磁性
流体１５がキャリッジ（可動部）１１とガイドレール（
固定部）１３に介在するため、本来の位置決め直進動作
をする場合に磁性流体１５にせん断力が働き、その分だ
け直進動作における抵抗が増加するわけであるが この
せん断抵抗は流体膜厚に反比例し、磁性流体１５の絞り
膜効果が流体膜厚の３乗に反比例することから、すべり
崩１２とガイドし−ル１３の上面との隙間を微小にし、
かつ、すべり断面積を小さくすることによって、直進動
作における抵抗をアクチュ１−りの駆動力にくらべ無視
できるほど小さく、かつ、キャリッジ１１に生じる振動
を制振するに十分な減衰力をもたせることが可能である
。As described above, in the head positioning mechanism according to the present invention, the magnetic fluid 15 moves between the carriage (movable part) 11 and the guide rail (
Since the magnetic fluid 15 is interposed in the fixed part (fixed part) 13, shearing force acts on the magnetic fluid 15 when performing the original positioning straight movement, and the resistance in the straight movement increases by that amount, but this shear resistance is inversely proportional to the fluid film thickness. However, since the aperture film effect of the magnetic fluid 15 is inversely proportional to the cube of the fluid film thickness, the gap between the slide collapse 12 and the upper surface of the guide rule 13 is made very small.
In addition, by reducing the sliding cross-sectional area, it is possible to make the resistance during straight movement so small that it can be ignored compared to the driving force of the actuator 1, and to provide sufficient damping force to suppress vibrations occurring in the carriage 11. It is possible.
一例をあげれは、一般的な磁気ディスク装置に用いられ
ている位置決め機構とほぼ同様の仕様である可動重量（
＞５ｋｇ、駆動力１ｏｋｙのヘッド位置決め機構におい
て、すべり断面積１０ｇ、’すべり面１２とガイドレー
ル１３上面との隙間５０μｍとし、数百ＣＰＳの粘度の
磁性流体１５を用いれば、前述の要求性能を十分溝すこ
とができる。As an example, a movable weight (
>5 kg and a driving force of 1 ky, the sliding cross-sectional area is 10 g, the gap between the sliding surface 12 and the upper surface of the guide rail 13 is 50 μm, and the above-mentioned required performance can be achieved by using the magnetic fluid 15 with a viscosity of several hundred CPS. Can be fully grooved.
なお、上記実施例では、キャリッジ１１とガイドレール
１３との対向面にすベリ拵１２を構成したが、すべり面
１２を構成する場合はそこに限定されるわけではなく、
キャリッジ１１なとの可動部とガイドレール１２などの
固定部との間に適当に狭い隙間を有する対向向を構成す
れは、この発明による効果が得られることはいうまでも
ない。In the above embodiment, the sliding surface 12 is formed on the opposing surface of the carriage 11 and the guide rail 13, but the sliding surface 12 is not limited thereto.
It goes without saying that the effects of the present invention can be obtained by configuring a movable part such as the carriage 11 and a fixed part such as the guide rail 12 so that they face each other with an appropriately narrow gap.
以上説明したようにこの発明によれは、従来、制振が困
難であったキャリッジのころがり軸受をはねとする振動
をきわめて簡単な構造で制振することができ、位置決め
時間の短縮と位置決め精度を大幅に向上させることがで
きる利点が得られる。As explained above, the present invention makes it possible to suppress vibrations that hit the rolling bearing of the carriage, which were difficult to suppress in the past, with an extremely simple structure, thereby reducing positioning time and positioning accuracy. This provides the advantage of being able to significantly improve
第１図は従来のヘッド位置決め機構の一例を示す側揺図
、第２図はこの発明の一実施例を示すヘッド位置決め機
構の一部を断面で表わした拡大側面図である。
図中、１はヘッド、３はころがり軸受、５はアクチユエ
ータ、６はディスク、１１はキャリッジ、１２はすべり
筒、１３はガイドレール、１４は永久磁石、１５は磁性
流体である。FIG. 1 is a side view showing an example of a conventional head positioning mechanism, and FIG. 2 is an enlarged side view showing a part of the head positioning mechanism in cross section, showing an embodiment of the present invention. In the figure, 1 is a head, 3 is a rolling bearing, 5 is an actuator, 6 is a disk, 11 is a carriage, 12 is a sliding tube, 13 is a guide rail, 14 is a permanent magnet, and 15 is a magnetic fluid.
Claims (1)
を位置決めするヘッド位置決め機構において、前記キャ
リッジとこれを案内する固定部との間に狭い隙間を有す
る対向面を設けその対向面の一方に永久磁石を埋設し、
かつ前記隙間に磁性流体を充てんしたことを特徴とする
ヘッド位置決め機構。1. In a head positioning mechanism that positions a head attached to a carriage to a desired track, an opposing surface with a narrow gap is provided between the carriage and a fixed part that guides it, and a permanent magnet is embedded in one of the opposing surfaces. death,
A head positioning mechanism characterized in that the gap is filled with magnetic fluid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13620277A JPS5827898B2 (en) | 1977-11-15 | 1977-11-15 | Head positioning mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13620277A JPS5827898B2 (en) | 1977-11-15 | 1977-11-15 | Head positioning mechanism |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5469412A JPS5469412A (en) | 1979-06-04 |
| JPS5827898B2 true JPS5827898B2 (en) | 1983-06-13 |
Family
ID=15169711
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13620277A Expired JPS5827898B2 (en) | 1977-11-15 | 1977-11-15 | Head positioning mechanism |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5827898B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL8501154A (en) * | 1985-04-22 | 1986-11-17 | Philips Nv | SWIVEL ARM DEVICE FOR A SCAN FOR RECORDING AND / OR READING INFORMATION IN A DISC REGISTRATION CARRIER. |
-
1977
- 1977-11-15 JP JP13620277A patent/JPS5827898B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5469412A (en) | 1979-06-04 |
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