JPS622953Y2 - - Google Patents
Info
- Publication number
- JPS622953Y2 JPS622953Y2 JP1980107845U JP10784580U JPS622953Y2 JP S622953 Y2 JPS622953 Y2 JP S622953Y2 JP 1980107845 U JP1980107845 U JP 1980107845U JP 10784580 U JP10784580 U JP 10784580U JP S622953 Y2 JPS622953 Y2 JP S622953Y2
- Authority
- JP
- Japan
- Prior art keywords
- yoke
- linear actuator
- permanent magnet
- magnetic flux
- center
- 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
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims 2
- 239000010959 steel Substances 0.000 claims 2
- 230000004907 flux Effects 0.000 description 16
- BGPVFRJUHWVFKM-UHFFFAOYSA-N N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] Chemical compound N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] BGPVFRJUHWVFKM-UHFFFAOYSA-N 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 235000011293 Brassica napus Nutrition 0.000 description 1
- 240000008100 Brassica rapa Species 0.000 description 1
- 235000000540 Brassica rapa subsp rapa Nutrition 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000010960 cold rolled steel Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Landscapes
- Reciprocating, Oscillating Or Vibrating Motors (AREA)
Description
【考案の詳細な説明】
本考案はリニアアクチユエータに関しさらに詳
しくは磁気デイスクにおけるリニアアクチユエー
タの漏洩磁束を減少させるごとくしたリニアアク
チユエータに関するものである。[Detailed Description of the Invention] The present invention relates to a linear actuator, and more particularly, to a linear actuator that reduces leakage magnetic flux of the linear actuator in a magnetic disk.
従来よりこの種磁気デイスク装置におけるリニ
アアクチユエータの構造は第１図に示すごとくな
つている。 Conventionally, the structure of a linear actuator in this type of magnetic disk device has been as shown in FIG.
第１図はその断面図で、１はセンターヨークを
示し、その周囲には空隙２を介して外周部ヨーク
３が設けられ、該ヨーク３の前後に永久磁石４，
４′を同極性になるごとく軸方向に対抗させてお
り、また該永久磁石４，４′の反対の極とセンタ
ーヨーク１の前後両端面とをそれぞれ磁気的に矢
印５，５′のごとく短絡させた前部ヨーク６と後
部ヨーク７を有している。そして、中央部に磁気
ヘツド８を搭載する。またキヤリツジ９に連結し
た可動コイル１０が収容されていて、該可動コイ
ルへの入力信号によつて磁気ヘツドを所望のＲ／
Ｗ位置に移動させることができるようになつてい
る。しかしながら、このような構造においては、
永久磁石４′の側面等の露出が大きく、図示のよ
うに磁気回路からの漏洩磁束１１が磁気ヘツド側
に大きく漏洩し、Ｒ／Ｗに悪い影響を及ぼす不都
合がある。特に最近の小型化高密度化したデイス
ク装置にあつては漏洩磁束による障害が大である
という問題点があつた。 FIG. 1 is a cross-sectional view of the same, in which 1 indicates a center yoke, around which an outer peripheral yoke 3 is provided with a gap 2 in between, and permanent magnets 4,
4' are opposed in the axial direction so that they have the same polarity, and the opposite poles of the permanent magnets 4, 4' and both front and rear end surfaces of the center yoke 1 are magnetically shorted as shown by arrows 5, 5', respectively. It has a front yoke 6 and a rear yoke 7. A magnetic head 8 is mounted in the center. Further, a moving coil 10 connected to the carriage 9 is housed, and an input signal to the moving coil moves the magnetic head to a desired R/R.
It can be moved to the W position. However, in such a structure,
The side surfaces of the permanent magnets 4' are largely exposed, and as shown in the figure, a large amount of leakage magnetic flux 11 from the magnetic circuit leaks to the magnetic head side, which is disadvantageous in that it adversely affects the R/W. Particularly in the case of recent disk devices that have become smaller and more dense, there has been a problem in that problems caused by leakage magnetic flux are serious.
本考案は上記問題点に鑑みなされたものであつ
てその目的とするところは、磁気ヘツド側に磁束
の漏洩すること防止するごとくしたリニアアクチ
ユエータを提供することにある。 The present invention has been devised in view of the above problems, and its purpose is to provide a linear actuator that prevents magnetic flux from leaking to the magnetic head side.
上記目的達成のため本考案の特徴は、軸方向に
移動可能な可動コイルと、該可動コイルの内側に
配置されたセンターヨークと、センターヨークの
周囲に上記可動コイルの移動できる所定厚さの空
隙を介して配置された外周部ヨークと、軸方向に
該外周部ヨークを介して同じ極性同土を対抗させ
て設けた永久磁石と、該永久磁石の反対極とセン
ターヨークの軸方向両端面とをそれぞれ磁気的に
短絡するごとくした前ヨークと後ヨークとを有す
るボイスコイルモータよりなるリニアアクチユエ
ータにおいて、上記前ヨークの外形の一部または
全周が前記永久磁石より大でかつ上記軸方向に折
曲げたことにある。 To achieve the above object, the present invention is characterized by a moving coil movable in the axial direction, a center yoke disposed inside the moving coil, and a gap of a predetermined thickness around the center yoke through which the moving coil can move. an outer circumferential yoke disposed through the outer circumferential yoke, a permanent magnet provided with the same polarity opposite in the axial direction via the outer circumferential yoke, and an opposite pole of the permanent magnet and both axial end surfaces of the center yoke. In a linear actuator comprising a voice coil motor having a front yoke and a rear yoke that are magnetically short-circuited, the front yoke has a part or the entire circumference larger than the permanent magnet, and It is because it was bent.
以下本考案の一実施例につき、図面を参照して
説明する。第２図ＡおよびＢに本考案に係るリニ
アアクチユエータの側断面および正面の一部断面
を示す。図示される前部後部ヨーク６，７の材料
としては冷間圧延鋼板を数枚重ねとすることによ
り所定の厚さとしたものを使用できる。前部ヨー
ク６のうち磁気ヘツド側の１枚または２枚の板を
磁石４，４′の外径より大きくするだけとするか
若しくは大きくすると共に外周先端を１２のごと
く軸方向に磁石４′の側面を覆うごとく折曲げ
る。このように前部ヨーク６の磁気ヘツド側の板
を磁石を覆うごとく折曲げたことによつて磁束５
の漏洩磁束１１は図のごとく前部ヨーク６の折曲
げ部１２により遮蔽され該前部ヨーク６から磁気
ヘツド側へ漏れることを防止することができる。 An embodiment of the present invention will be described below with reference to the drawings. FIGS. 2A and 2B show a side cross section and a partial front cross section of the linear actuator according to the present invention. As the material for the front and rear yokes 6 and 7 shown in the figure, it is possible to use a material made by stacking several cold-rolled steel plates to a predetermined thickness. One or two plates on the magnetic head side of the front yoke 6 may be made larger than the outer diameter of the magnets 4, 4', or may be made larger and the outer peripheral tip oriented axially as shown at 12 of the magnet 4'. Fold it to cover the sides. By bending the plate on the magnetic head side of the front yoke 6 to cover the magnet in this way, the magnetic flux 5
The leakage magnetic flux 11 is shielded by the bent portion 12 of the front yoke 6 as shown in the figure, and can be prevented from leaking from the front yoke 6 to the magnetic head side.
第３図は本考案のリニアアクチユエータを従来
と比較した漏洩磁束分布カーブで示すものであ
り、前部ヨーク端面の位置を０とした距離Ｘ
（mm）が横軸に、漏洩磁束Hy（ｏ）が縦軸に対
応している。この図から明らかなように従来のア
クチユエータではカーブ１３に示す通り漏洩磁束
Hyは甚しく大であるが本考案のアクチユエータ
ではカーブ１４で示すごとく従来のものに比べて
漏洩磁束Hyが大巾に減少し情報領域の最外部１
５の位置において半減する。 Figure 3 shows a leakage magnetic flux distribution curve comparing the linear actuator of the present invention with a conventional one, and shows the distance X with the position of the front yoke end face as 0.
(mm) corresponds to the horizontal axis, and leakage magnetic flux Hy(o) corresponds to the vertical axis. As is clear from this figure, in the conventional actuator, magnetic flux leaks as shown by curve 13.
Hy is extremely large, but in the actuator of the present invention, as shown by curve 14, the leakage magnetic flux Hy is greatly reduced compared to the conventional one, and the outermost part of the information area 1
It is halved at position 5.
以上説明したように本考案のリニアアクチユエ
ータであれば前部ヨーク６の磁気ヘツド８に最も
近いヨーク板の１枚または２枚を磁石４，４′の
外径より大きくするか若しくは大きくした外周を
１２のごとく永久磁石４′の側面を覆う方向に折
曲げたことにより磁束が磁気ヘツド８の側に漏洩
することを防止することができその効果は極めて
大である。 As explained above, in the linear actuator of the present invention, one or two of the yoke plates closest to the magnetic head 8 of the front yoke 6 are made larger or larger than the outer diameter of the magnets 4, 4'. By bending the outer periphery as indicated by 12 in a direction to cover the side surface of the permanent magnet 4', it is possible to prevent the magnetic flux from leaking to the magnetic head 8 side, which is extremely effective.
第１図は従来のリニアアクチユエータの構造を
示す側断面図、第２図Ａは本考案のリニアアクチ
ユエータの側断面図、第２図Ｂは第２図Ａの正面
図（一部断面）、第３図は本考案のリニアアクチ
ユエータの効果を示す漏洩磁束の曲線図である。
１……センターヨーク、２……空隙、３……外
周部ヨーク、４，４′……永久磁石、５……磁
束、６……前部ヨーク、７……後部ヨーク、８…
…磁気ヘツド、９……キヤリツジ、１０……可動
コイル、１１……漏洩磁束、１２……前部ヨーク
の折曲げ部、１３……従来の漏洩磁束分布カブ、
１４……本発明の折曲げ部を有する場合の漏洩磁
束分布カーブ。
Figure 1 is a side sectional view showing the structure of a conventional linear actuator, Figure 2A is a side sectional view of the linear actuator of the present invention, and Figure 2B is a front view (partially FIG. 3 is a curve diagram of leakage magnetic flux showing the effect of the linear actuator of the present invention. 1... Center yoke, 2... Air gap, 3... Outer yoke, 4, 4'... Permanent magnet, 5... Magnetic flux, 6... Front yoke, 7... Rear yoke, 8...
... Magnetic head, 9... Carriage, 10... Moving coil, 11... Leakage magnetic flux, 12... Bent part of front yoke, 13... Conventional leakage magnetic flux distribution turnip,
14...Leakage magnetic flux distribution curve when the present invention has a bent portion.
Claims (1)
ルの内側に配置されたセンターヨークと、該セン
ターヨークの周囲に上記可動コイルの移動できる
所定厚さの空隙を介して配置された外周部ヨーク
と、軸方向に該外周部同じ極性同士を対向させて
設けた永久磁石と、該永久磁石の反対極とセンタ
ーヨークの軸方向両端面とをそれぞれ磁気的に短
絡するごとくした前部ヨークと後部ヨークとを有
するボイスコイルモータよりなるリニアアクチユ
エータにおいて、上記前部ヨークを複数枚の鋼板
で構成し、その最前部の鋼板の外形の一部または
全周が前記永久磁石より大でかつ上記軸方向に折
り曲げたことを特徴とするリニアアクチユエー
タ。 a movable coil that is movable in the axial direction; a center yoke disposed inside the movable coil; and an outer peripheral yoke disposed around the center yoke with a gap of a predetermined thickness through which the movable coil can move. , a front yoke and a rear yoke, each having a permanent magnet with the same polarity facing each other on the outer periphery in the axial direction, and magnetically short-circuiting the opposite pole of the permanent magnet and both axial end surfaces of the center yoke. In the linear actuator comprising a voice coil motor, the front yoke is composed of a plurality of steel plates, and a part or the entire circumference of the frontmost steel plate is larger than the permanent magnet, and the shaft A linear actuator characterized by being bent in one direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1980107845U JPS622953Y2 (en) | 1980-07-30 | 1980-07-30 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1980107845U JPS622953Y2 (en) | 1980-07-30 | 1980-07-30 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5731081U JPS5731081U (en) | 1982-02-18 |
| JPS622953Y2 true JPS622953Y2 (en) | 1987-01-23 |
Family
ID=29469127
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1980107845U Expired JPS622953Y2 (en) | 1980-07-30 | 1980-07-30 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS622953Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0619301Y2 (en) * | 1988-12-21 | 1994-05-18 | 株式会社コパル | Linear solenoid |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS505114B2 (en) * | 1972-11-17 | 1975-02-28 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS505114U (en) * | 1973-05-11 | 1975-01-20 |
-
1980
- 1980-07-30 JP JP1980107845U patent/JPS622953Y2/ja not_active Expired
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS505114B2 (en) * | 1972-11-17 | 1975-02-28 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5731081U (en) | 1982-02-18 |
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