JPH0560162B2 - - Google Patents
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- Publication number
- JPH0560162B2 JPH0560162B2 JP9199285A JP9199285A JPH0560162B2 JP H0560162 B2 JPH0560162 B2 JP H0560162B2 JP 9199285 A JP9199285 A JP 9199285A JP 9199285 A JP9199285 A JP 9199285A JP H0560162 B2 JPH0560162 B2 JP H0560162B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic field
- permanent magnet
- coil
- external magnetic
- disk
- 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.)
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- 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 75
- 230000003287 optical effect Effects 0.000 description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 9
- 238000001514 detection method Methods 0.000 description 5
- 229910052742 iron Inorganic materials 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000004907 flux Effects 0.000 description 3
- 230000005415 magnetization Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 150000002505 iron Chemical class 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000005381 magnetic domain Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
Landscapes
- Recording Or Reproducing By Magnetic Means (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は光磁気デイスク装置に使用される外
部磁界反転装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to an external magnetic field reversal device used in a magneto-optical disk device.
この発明は、光磁気デイスク装置に使用される
外部磁界反転装置に関し、特に外部磁界形成手段
として永久磁石を使用すると共に、この永久磁石
を囲繞するようにコイルを配し、永久磁石により
形成される外部磁界とコイルに電流を流すことに
よつて発生する磁界とによる反発力によつて発生
する永久磁石に加わる回転力で、永久磁石を所望
の方向に半回転できるようにしたものであり、こ
れによつて、安価で信頼性に富み、しかも小型化
が図れる外部磁界反転装置が得られるようにした
ものである。
The present invention relates to an external magnetic field reversal device used in a magneto-optical disk device, and in particular uses a permanent magnet as an external magnetic field forming means, and a coil is arranged to surround the permanent magnet, so that the magnetic field is formed by the permanent magnet. The permanent magnet can be rotated half a turn in the desired direction using the rotational force applied to the permanent magnet due to the repulsion between the external magnetic field and the magnetic field generated by passing current through the coil. Accordingly, it is possible to obtain an external magnetic field reversal device that is inexpensive, highly reliable, and can be miniaturized.
光磁気デイスクを使用してデータを記録再生す
ることのできる光磁気デイスク装置は既に知られ
ている(特開昭58−14306号公報や、特開昭57−
133537号公報など)。
Magneto-optical disk devices capable of recording and reproducing data using magneto-optical disks are already known (Japanese Patent Application Laid-open Nos. 14306-1982 and 1983-1999).
133537, etc.).
この光磁気デイスク装置の基本概念を第11図
及び第12図を使用して説明すると、第11図に
おいて、1は光磁気デイスクで、これはデータ記
録前において、例えば図に示すごとく一方向(下
方向)に向かつて一様に磁化されているものとす
る。デイスク1の一面にはデータをデイスク面に
記録し、またこれよりそのデータを再生するため
の光ピツクアツプ装置2が対向配置される。光ピ
ツクアツプ装置2は周知のようにデータの記録再
生用としてレーザー(半導体レーザーなど)が使
用され、このレーザーは対物レンズ3によつてデ
イスク面に光路1のごとく収束される。 The basic concept of this magneto-optical disk device will be explained using FIGS. 11 and 12. In FIG. 11, reference numeral 1 is a magneto-optical disk. It is assumed that the magnet is uniformly magnetized in the downward direction. An optical pickup device 2 for recording data on the disk surface and for reproducing the data from the disk surface is arranged opposite to one surface of the disk 1. As is well known, the optical pickup device 2 uses a laser (such as a semiconductor laser) for recording and reproducing data, and this laser is focused by an objective lens 3 onto the disk surface along an optical path 1.
光ピツクアツプ装置2とは反対側のデイスク面
には外部磁界形成手段たる電磁石5が光ピツクア
ツプ装置2と対向するように配置され、この電磁
石5によつて、図示のようなデイスク面に垂直な
外部磁界Hが形成される。 On the disk surface opposite to the optical pickup device 2, an electromagnet 5 serving as an external magnetic field forming means is arranged so as to face the optical pickup device 2. A magnetic field H is created.
所定のデイスク面に光ピツクアツプ装置2を移
動させて、これよりレーザーを照射し、そのデイ
スク面の温度をキユーリー点以上の温度(400℃)
まで加熱すると、加熱部分の磁区は不揃いとな
る。この状態で第11図に示す外部磁界Hとは逆
方向の外部磁界H(第12図)が加わるように、
電磁石5に所定の電流を流すと、加熱部分のデイ
スク1内の磁化方向は破線で示すように、外部磁
界Hと同一方向となるので、その状態でレーザー
の照射を停止すると、内部磁界は破線図示の状態
のままとなる。この内部磁界の向きをさらに反転
するには、外部磁界Hを第11図に示すように反
転させて、上述の操作を実行すればよい。そし
て、第11図に示す磁化方向を例えば“0”、第
12図の破線で示す磁化方向を“1”と定めるこ
とによつて、上述した磁化操作をデイスク1の円
周方向に所定のピツチで順次行なえば、その円周
方向に“0”、“1”のデータを記録(再記録を含
む)することができる。 Move the optical pickup device 2 to a predetermined disk surface, irradiate the laser with it, and raise the temperature of the disk surface to a temperature above the Curie point (400°C).
When heated to a certain temperature, the magnetic domains in the heated area become irregular. In this state, an external magnetic field H (Fig. 12) in the opposite direction to the external magnetic field H shown in Fig. 11 is applied.
When a predetermined current is passed through the electromagnet 5, the direction of magnetization in the heated portion of the disk 1 becomes the same direction as the external magnetic field H, as shown by the broken line.If the laser irradiation is stopped in this state, the internal magnetic field changes as shown by the broken line. The state remains as shown. In order to further reverse the direction of this internal magnetic field, the external magnetic field H may be reversed as shown in FIG. 11 and the above-described operation may be performed. By setting the magnetization direction shown in FIG. 11 as, for example, "0" and the magnetization direction shown by the broken line in FIG. If this is performed sequentially, data of "0" and "1" can be recorded (including re-recording) in the circumferential direction.
外部磁界形成手段としては電磁石の他に永久磁
石も使用できる。第13図は永久磁石を外部磁界
形成手段5として利用した場合の一例を示す外部
磁界反転装置20の構成図であつて、図示のよう
な極性をもつて着磁された偏平な直方体状をなす
永久磁石5はデイスク1に対向配置されると共
に、これが回転自在に取り付けられ、その回転軸
6はステツピングモータ7の回転軸に連結手段8
を介して連結される。 In addition to electromagnets, permanent magnets can also be used as the external magnetic field forming means. FIG. 13 is a block diagram of an external magnetic field reversal device 20 showing an example of a case where a permanent magnet is used as the external magnetic field forming means 5, and is a flat rectangular parallelepiped magnet magnetized with the polarity shown in the figure. A permanent magnet 5 is disposed opposite to the disk 1 and is rotatably attached, and its rotating shaft 6 is connected to a rotating shaft of a stepping motor 7 through a connecting means 8.
connected via.
モータ7はシステムコントローラ(図示せず)
からの駆動信号に基づき制御され、モータ7の駆
動に基づき永久磁石5が半回転され、半回転状態
は第14図に示す一対のスイツチ11,12によ
つて検出される。 Motor 7 is a system controller (not shown)
The permanent magnet 5 is controlled based on a drive signal from the motor 7, and the permanent magnet 5 is rotated half a rotation based on the drive of the motor 7, and the half rotation state is detected by a pair of switches 11 and 12 shown in FIG.
そのため、永久磁石5を取り付けているホール
ダ13には、第14図に示すように突片13Aが
設けられると共に、永久磁石5が180゜回転する
夫々の位置には一対のスイツチ11,12が設け
られ、スイツチ11,12に突片13Aが当接し
たときに得られる信号でモータ7への駆動信号の
供給が停止される。これによつて、永久磁石5の
半回転状態の安定化が図られる。 Therefore, the holder 13 to which the permanent magnet 5 is attached is provided with a projection 13A as shown in FIG. 14, and a pair of switches 11 and 12 are provided at each position where the permanent magnet 5 rotates 180 degrees. The supply of the drive signal to the motor 7 is stopped by a signal obtained when the protrusion 13A contacts the switches 11 and 12. This stabilizes the half-rotation state of the permanent magnet 5.
このように、電磁石に替えて永久磁石を使用し
て外部磁界反転装置10を構成する場合、次のよ
うな問題がある。
As described above, when the external magnetic field reversal device 10 is constructed using permanent magnets instead of electromagnets, the following problems occur.
まず、この外部磁界反転装置10は永久磁石5
の反転駆動源としてステツピングモータ7を使用
する関係上、モータ7の他にドライバーなどの回
路も必要となり、全体としてコスト高となる欠点
がある。またモータ7や一対のスイツチ11,1
2などの消耗部品を使用して構成されているた
め、装置の寿命が短く、信頼性に欠けると共に、
モータ7などの取り付けのために装置小型化の隘
路となつている。 First, this external magnetic field reversal device 10 uses a permanent magnet 5.
Because the stepping motor 7 is used as a reversing drive source, a circuit such as a driver is also required in addition to the motor 7, which has the drawback of increasing the overall cost. In addition, the motor 7 and a pair of switches 11, 1
Since the device is constructed using consumable parts such as 2, it has a short lifespan, lacks reliability, and
The installation of the motor 7, etc. is a bottleneck in making the device more compact.
そこで、この発明ではこのような従来の問題点
を解決したものであつて、安価で信頼性に富む小
型化できる光磁気デイスク装置用外部磁界反転装
置を提案するものである。 Therefore, the present invention solves these conventional problems and proposes an external magnetic field reversal device for a magneto-optical disk device that is inexpensive, highly reliable, and can be miniaturized.
上述の問題点を解決するため、この発明では第
1図にその一例を示すように、回転自在に配され
た永久磁石5に対し、これを囲繞するようにコイ
ル25が配され、永久磁石5の磁界とコイル25
に電流を流すことによつて発生する磁界との反発
力によつて、永久磁石5に所望方向の回転力を付
与する。
In order to solve the above-mentioned problems, in the present invention, as shown in FIG. magnetic field and coil 25
A rotational force in a desired direction is applied to the permanent magnet 5 by the repulsive force with the magnetic field generated by passing a current through the magnet.
永久磁石5に所望方向の回転力を与える手段と
しては種々の手段を採り得、第1図に示す実施例
では、永久磁石5の長手方向に沿うコイル25の
中心Lcに対し、永久磁石5の回転中心Lmをコイ
ル中心Lcと並行に所定の間隔ΔLだけ若干ずら
す。 Various means can be used to apply a rotational force in a desired direction to the permanent magnet 5, and in the embodiment shown in FIG. The rotation center Lm is slightly shifted by a predetermined distance ΔL parallel to the coil center Lc.
この構成によれば、コイル25に電流を流すこ
とによつて生ずる磁界と永久磁石5そのものの磁
界との反発力が永久磁石5の回転中心Lmの左側
と右側とで相違するから、この反発力の相違で永
久磁石5が所望の方向(時計方向または反時計方
向)に回転する。この場合、コイル25への通電
をそのまま保持すれば、永久磁石5は半回転した
状態で安定する。これは永久磁石5の磁界とコイ
ル25の磁界とが同じ向きになつて、永久磁石5
に加わる反発力が消失するからである。
According to this configuration, the repulsive force between the magnetic field generated by passing a current through the coil 25 and the magnetic field of the permanent magnet 5 itself is different between the left side and the right side of the rotation center Lm of the permanent magnet 5, so this repulsive force The permanent magnet 5 rotates in a desired direction (clockwise or counterclockwise) due to the difference between the two. In this case, if the coil 25 is kept energized, the permanent magnet 5 is stabilized in a half-rotation state. This is because the magnetic field of the permanent magnet 5 and the magnetic field of the coil 25 are in the same direction, and the permanent magnet 5
This is because the repulsive force applied to the will disappear.
これによつて、デイスク1を通過する外部磁界
Hの向きが反転し、またこの外部磁界Hの向きを
さらに反転させる場合には、コイル25に上述と
は逆向きの電流を流せば、上述と同様な理由に基
づき永久磁石5はさらに半回転してその状態で安
定する。 As a result, the direction of the external magnetic field H passing through the disk 1 is reversed, and if the direction of the external magnetic field H is to be further reversed, a current in the opposite direction to that described above can be passed through the coil 25 to achieve the above-mentioned result. Based on the same reason, the permanent magnet 5 rotates another half turn and becomes stable in that state.
このように、永久磁石5の磁界を積極的に利用
し、コイル25で発生する磁界を必要なときだけ
発生させれば、デイスク面に対する永久磁石5の
対向極性を自由に変更することができる。 In this way, by actively utilizing the magnetic field of the permanent magnet 5 and generating the magnetic field generated by the coil 25 only when necessary, the opposing polarity of the permanent magnet 5 with respect to the disk surface can be freely changed.
永久磁石5の磁界とコイル25の磁界で永久磁
石5に対する回転力を形成するこの発明の構成に
よれば、装置の小型化、装置の信頼性などの効果
が得られる。 According to the configuration of the present invention in which the magnetic field of the permanent magnet 5 and the magnetic field of the coil 25 form a rotational force on the permanent magnet 5, effects such as miniaturization of the device and reliability of the device can be obtained.
第1図以下を参照してこの発明に係る外部磁界
反転装置20の一例を詳細に説明する。
An example of an external magnetic field reversal device 20 according to the present invention will be described in detail with reference to FIG. 1 and the following figures.
この装置に使用される永久磁石は第4図に示す
ように、偏平な直方体をなし、偏平面の一方がS
極、他方がN極となるように着磁される。永久磁
石5は第1図及び第2図に示すホールダ21に取
り付けられ、ホールダ21にはその左右両端に回
転軸22が設けられ、これらは主取付板23に形
成された一対の取付片24A,24Bに回転自在
に軸支される。 The permanent magnet used in this device has a flat rectangular parallelepiped shape, as shown in Figure 4, and one of the flat surfaces is S.
One pole is magnetized so that the other becomes a north pole. The permanent magnet 5 is attached to a holder 21 shown in FIGS. 1 and 2, and the holder 21 is provided with rotating shafts 22 at both left and right ends thereof, which are connected to a pair of attachment pieces 24A formed on the main attachment plate 23, 24B and is rotatably supported.
永久磁石5の周囲には第1図に示すように、こ
の永久磁石5を囲繞するように所定のターン数を
もつてコイル25が設けられる。この場合、永久
磁石5の回転中心Lmとコイル25の回転軸22
方向における中心LcとがΔLだけけずられ、この
例では図示のように回転中心Lmがコイル25の
中心LcよりもΔLだけ下側に位置するように夫々
の取り付け位置が選定される。 As shown in FIG. 1, a coil 25 is provided around the permanent magnet 5 with a predetermined number of turns so as to surround the permanent magnet 5. In this case, the rotation center Lm of the permanent magnet 5 and the rotation axis 22 of the coil 25
The respective mounting positions are selected so that the center Lc in the direction is shifted by ΔL, and in this example, the rotation center Lm is located below the center Lc of the coil 25 by ΔL, as shown in the figure.
26,27はコイル25の囲繞位置を特定する
ために設けられた係止片で、これらはいずれも主
取付板23に固定されている。 Locking pieces 26 and 27 are provided to specify the surrounding position of the coil 25, and both of these pieces are fixed to the main mounting plate 23.
ここで、第1図の縦断面の要部を示せば第3図
のようになる。説明の都合上、永久磁石5の極性
は上方がN極で、下側がS極となつており、この
状態のときコイル25に所定の電流を流して下向
きのコイル磁界Hcを発生させたとする。このと
き、磁界Hcはコイル中心Lcで最大となるから、
この磁界Hc内に置かれる永久磁石5の回転軸2
2を基準にしてその右側での磁界Hcの強さと、
その左側での磁界Hc′とは、
Hc>Hc′
の関係になる。 Here, the main part of the longitudinal section of FIG. 1 is shown in FIG. 3. For convenience of explanation, it is assumed that the polarity of the permanent magnet 5 is an N pole on the upper side and an S pole on the lower side, and in this state, a predetermined current is passed through the coil 25 to generate a downward coil magnetic field Hc. At this time, the magnetic field Hc is maximum at the coil center Lc, so
Rotating shaft 2 of permanent magnet 5 placed within this magnetic field Hc
The strength of the magnetic field Hc on the right side of 2,
The magnetic field Hc′ on the left side has the relationship Hc>Hc′.
一方、永久磁石5の磁界Hmは回転軸22の両
側とも等しく、また第3図に示す極性ではその磁
界Hmは上向きとなることから、これら磁界Hc
とHm及びHc′とHmとの間で反発力が生じる。
また、コイル磁界Hc,Hc′と永久磁石5の磁界
Hmとの関係は、
Hc,Hc′≪Hm
に選定されている。 On the other hand, the magnetic field Hm of the permanent magnet 5 is equal on both sides of the rotating shaft 22, and in the polarity shown in FIG. 3, the magnetic field Hm is directed upward, so these magnetic fields Hc
A repulsive force is generated between and Hm and between Hc′ and Hm.
In addition, the coil magnetic fields Hc, Hc′ and the magnetic field of the permanent magnet 5
The relationship with Hm is selected as Hc, Hc′≪Hm.
このようなことから、図示の場合には、Hc>
Hc′であるから、回転軸22の右側の方が左側よ
りも反発力が大きくなるため、永久磁石5は反時
計方向に回転する。 For this reason, in the case shown, Hc>
Hc', the repulsive force is greater on the right side of the rotating shaft 22 than on the left side, so the permanent magnet 5 rotates counterclockwise.
永久磁石5が半回転すると、永久磁石5の極性
は図示と反対になるので、磁界Hmも下向きとな
り、この場合には反発力は生じない。 When the permanent magnet 5 rotates half a rotation, the polarity of the permanent magnet 5 becomes opposite to that shown in the figure, so the magnetic field Hm also becomes downward, and in this case, no repulsive force is generated.
永久磁石5が半回転したのちでもコイル25に
は電流を流しておく。こうすると、外乱によつて
も永久磁石5の回転位置は変動せず、回転状態が
安定する。 A current is kept flowing through the coil 25 even after the permanent magnet 5 has rotated half a rotation. In this way, the rotational position of the permanent magnet 5 will not change even due to disturbances, and the rotational state will be stabilized.
永久磁石5を元の回転状態に復帰させるには、
コイル25に対して上述とは逆向きの電流を流
す。そうすれば、このとき上向きのコイル磁界
Hc,Hc′が発生し、この磁界Hc,Hc′と永久磁
石5の磁界Hmとの間で反発力が生じて、上述と
同一の方向に永久磁石5が回転するからである。 To return the permanent magnet 5 to its original rotational state,
A current is passed through the coil 25 in the opposite direction to that described above. Then, at this time, the upward coil magnetic field
This is because Hc and Hc' are generated, and a repulsive force is generated between these magnetic fields Hc and Hc' and the magnetic field Hm of the permanent magnet 5, causing the permanent magnet 5 to rotate in the same direction as described above.
このような動作をなす外部磁界反転装置20は
第5図に示すように、その主取付板23が回動板
35に取り付けられ、回動板35は支点36を中
心に矢印aのように回動する。従つて、デイスク
1の装着時は2点鎖線図示のように外部磁界反転
装置20が回動されて、デイスク装着を容易に
し、デイスク装着後には実線図示のように回動さ
れ、デイスク1に対し永久磁石5が図示のように
対向される。 As shown in FIG. 5, the external magnetic field reversal device 20 that operates in this manner has its main mounting plate 23 attached to a rotating plate 35, and the rotating plate 35 rotates about a fulcrum 36 in the direction of arrow a. move. Therefore, when the disk 1 is mounted, the external magnetic field reversal device 20 is rotated as shown by the two-dot chain line to facilitate the mounting of the disk, and after the disk is mounted, it is rotated as shown by the solid line and Permanent magnets 5 are opposed as shown.
この状態でデータの記録及び再生が実行され、
例えば、所定のデータ(“0”または“1”)をデ
イスク面に記録する場合には、記録すべき位置に
光ピツクアツプ装置2を移動し、その状態でレー
ザーをデイスク面に照射すれば、永久磁石5によ
つて形成される外部磁界Hmの向きに応じたデー
タを記録できる。また、上述とは異なるデータを
記録する場合には、コイル25への通電によつて
永久磁石5のデイスク面に対する対向極性を反転
させ、その状態でレーザーを照射すればよい。 Data recording and playback are executed in this state,
For example, when recording predetermined data (“0” or “1”) on the disk surface, move the optical pickup device 2 to the recording position and irradiate the disk surface with a laser in that state. Data can be recorded according to the direction of the external magnetic field Hm formed by the magnet 5. In addition, when recording data different from that described above, the polarity of the permanent magnet 5 facing the disk surface may be reversed by energizing the coil 25, and the laser beam may be irradiated in this state.
このように、この発明では、永久磁石5自身の
磁界Hmを利用し、これに外部よりコイル磁界
Hcを加えることによつて永久磁石5に回転力を
付与するわけであるが、永久磁石5に回転力を付
与するための手段としては、第1図に示す実施例
に限られない。 In this way, in this invention, the magnetic field Hm of the permanent magnet 5 itself is used, and the coil magnetic field is applied to this from the outside.
Although the rotational force is applied to the permanent magnet 5 by applying Hc, the means for applying the rotational force to the permanent magnet 5 is not limited to the embodiment shown in FIG.
第6図以下を参照して他の手段の一例を説明し
よう。 An example of other means will be explained with reference to FIG. 6 and subsequent figures.
第6図に示す例は永久磁石5のホールダ21に
取り付けられる回転軸22の取り付け位置を、永
久磁石5の中心LmよりΔLだけずらして偏心さ
せ、その回転軸22がコイル25の中心Lcに一
致するように取り付けられる。 In the example shown in FIG. 6, the mounting position of the rotating shaft 22 attached to the holder 21 of the permanent magnet 5 is eccentrically shifted by ΔL from the center Lm of the permanent magnet 5, and the rotating shaft 22 is aligned with the center Lc of the coil 25. It can be installed as follows.
この構成によつても、永久磁石5の回転軸22
を中心としてその右側と左側とでは、磁界の強さ
が相違するので、上述したと同様な反発力が発生
して、永久磁石5を所望の方向に回転させること
ができる。 Even with this configuration, the rotating shaft 22 of the permanent magnet 5
Since the strength of the magnetic field is different on the right and left sides of the center, a repulsive force similar to that described above is generated, and the permanent magnet 5 can be rotated in a desired direction.
第7図に示す実施例は、永久磁石5の中心Lm
とその回転軸22の軸心が等しい第1図に示す構
成の永久磁石5を使用して構成した場合であつ
て、第8図に示すように、両中心LcとLmとは一
致するようにその相対的位置関係が選定されると
共に、一方の回転軸22の軸受け側には軸垂線に
対し所定の角度θだけ傾斜した状態で、ほぼコ字
状の鉄片30が取り付け固定される。 In the embodiment shown in FIG. 7, the center Lm of the permanent magnet 5
In the case of using a permanent magnet 5 having the configuration shown in FIG. 1, in which the axes of the rotating shaft 22 and the rotating shaft 22 are equal, and as shown in FIG. Their relative positional relationship is selected, and a substantially U-shaped iron piece 30 is attached and fixed to the bearing side of one rotating shaft 22 in a state inclined by a predetermined angle θ with respect to the axis perpendicular.
この鉄片30があると、コイル25の磁束は鉄
片30を通過するような磁路が形成されるため
に、永久磁石5の磁界Hmに対しコイル磁界Hc
がθだけ傾斜する。これによつて、その合成磁界
による永久磁石5に対する回転力が生じて、永久
磁石5が上述と同様に所定の方向に回転される。 With this iron piece 30, a magnetic path is formed in which the magnetic flux of the coil 25 passes through the iron piece 30, so that the coil magnetic field Hc is different from the magnetic field Hm of the permanent magnet 5.
is tilted by θ. As a result, a rotational force is generated on the permanent magnet 5 due to the combined magnetic field, and the permanent magnet 5 is rotated in a predetermined direction in the same manner as described above.
第9図に示す実施例は、第7図に示した鉄片3
0の替わりに短絡コイル33を設けた場合であつ
て、図のようにコイル25の中心Lcに第1図と
同様な永久磁石5が配されると共に、短絡コイル
33が永久磁石5の一面に対向するように配され
る。 The embodiment shown in FIG. 9 is based on the iron piece 3 shown in FIG.
In this case, a short-circuiting coil 33 is provided instead of 0, and as shown in the figure, a permanent magnet 5 similar to that shown in FIG. Arranged to face each other.
すなわち、第10図に示すようにこの例では、
永久磁石5の上面側で、かつその回転軸22の左
側に位置するようにこの永久磁石5と所定の間隔
を隔てて配置される。 That is, in this example, as shown in FIG.
It is arranged at a predetermined distance from the permanent magnet 5 so as to be located on the upper surface side of the permanent magnet 5 and on the left side of the rotating shaft 22 thereof.
このように構成した場合、コイル25の磁束の
一部が短絡コイル33と鎖交するのでこれに起電
力が発生して、これに基づき短絡コイル33には
所定の磁界が発生する。この磁界とコイル25の
磁界とによつて、その合成磁界は所定の角度たと
えばθだけ傾斜する。その結果、第7図に示した
と同じ回転力がこの永久磁石5に加わり、永久磁
石5を回転させることができる。 With this configuration, a part of the magnetic flux of the coil 25 interlinks with the shorting coil 33, so that an electromotive force is generated, and a predetermined magnetic field is generated in the shorting coil 33 based on this. Due to this magnetic field and the magnetic field of the coil 25, the combined magnetic field is tilted by a predetermined angle, for example, θ. As a result, the same rotational force as shown in FIG. 7 is applied to the permanent magnet 5, and the permanent magnet 5 can be rotated.
第1図以下に示す実施例では、第5図に示すよ
うに、永久磁石5の長さはデイスク1に記録でき
るトラツク数の長さにほぼ等しく選定され、所定
のトラツクデータを記録する場合には、そのトラ
ツクまで光ピツクアツプ装置2を移動させるよう
な構成であるが、これは一例に過ぎない。 In the embodiment shown in FIG. 1 and subsequent figures, the length of the permanent magnet 5 is selected to be approximately equal to the length of the number of tracks that can be recorded on the disk 1, as shown in FIG. Although the configuration is such that the optical pickup device 2 is moved to the truck, this is only an example.
なお、永久磁石5が正しく反転したかどうかを
判別するために、第5図に示すように永久磁石5
と対向する主取付板23にはその長孔23Aに臨
むように、磁界反転検出手段例えば、ホール素子
38が取り付けられる。ホール素子38に対向す
る永久磁石5の極性がN極かS極かによつて、ま
たこの永久磁石5よりの外部磁界Hmがホール素
子38を垂直に通過するか否かによつて、このホ
ール素子38の検出出力の極性及びその検出レベ
ルが相違するから、この検出出力で永久磁石5が
正しく反転しているか否かの判別及びその極性を
検出できる。 In addition, in order to determine whether the permanent magnet 5 has been correctly reversed, as shown in FIG.
A magnetic field reversal detecting means, for example, a Hall element 38 is attached to the main mounting plate 23 facing the main mounting plate 23 so as to face the elongated hole 23A. Depending on whether the polarity of the permanent magnet 5 facing the Hall element 38 is N pole or S pole, and whether or not the external magnetic field Hm from this permanent magnet 5 passes through the Hall element 38 perpendicularly, this hole Since the polarity and the detection level of the detection output of the element 38 are different, it is possible to determine whether the permanent magnet 5 is correctly reversed or not and to detect the polarity based on the detection output.
検出出力はシステムコントローラに供給され、
その検出出力に基づいてレーザーの照射状態の有
無がコントロールされる。 The detection output is supplied to the system controller,
Based on the detection output, the presence or absence of laser irradiation is controlled.
第1図以下に示す永久磁石5の形状及び長さは
一例であつて、これ以外の形状及び長さでもこの
考案を適用することができる。 The shape and length of the permanent magnet 5 shown in FIG. 1 and below are merely examples, and the present invention can be applied to other shapes and lengths.
以上説明したように、この発明では外部磁界形
成手段として永久磁石5が使用されると共に、回
転自在に配された永久磁石5に対し、これを囲繞
するようにコイル25が配され、永久磁石5の磁
界とコイル25に電流を流すことによつて発生す
る磁界の反発力を利用して、永久磁石5に所望方
向の回転力を付与したものである。すなわち、こ
の構成によれば、コイル25に電流を流すことに
よつて生ずる磁界と永久磁石5そのものの磁界と
の反発力が永久磁石5の回転中心Lmの左側と右
側とで相違するから、この反発力の相違で永久磁
石5が所望の方向(磁石中心Lmをコイル中心Lc
に対しいずれの方向にΔLだけずらすかによつて、
その回転方向が相違する。)に回転する。
As explained above, in this invention, the permanent magnet 5 is used as an external magnetic field forming means, and the coil 25 is arranged to surround the permanent magnet 5, which is arranged so as to be rotatable. A rotational force in a desired direction is applied to the permanent magnet 5 by using the magnetic field of the magnetic field and the repulsive force of the magnetic field generated by passing a current through the coil 25. That is, according to this configuration, the repulsive force between the magnetic field generated by passing a current through the coil 25 and the magnetic field of the permanent magnet 5 itself is different between the left side and the right side of the rotation center Lm of the permanent magnet 5. Due to the difference in repulsive force, the permanent magnet 5 moves in the desired direction (the center of the magnet Lm is the center of the coil Lc)
Depending on which direction you shift by ΔL,
The direction of rotation is different. ).
これによつて、デイスク1を通過する外部磁界
Hmの向きが反転し、またこの外部磁界Hmの向
きをさらに反転させる場合には、コイル25に上
述とは逆向きの電流を流せば、上述と同様な理由
に基づき永久磁石5はさらに半回転してその状態
で安定する。この構成により、この発明では従来
に比し、少なくとも以下のような効果が得られ
る。 As a result, the external magnetic field passing through the disk 1
If the direction of Hm is reversed and the direction of this external magnetic field Hm is to be further reversed, if a current in the opposite direction to that described above is passed through the coil 25, the permanent magnet 5 will rotate another half turn for the same reason as described above. and stabilize in that state. With this configuration, the present invention can achieve at least the following effects compared to the prior art.
第1に、永久磁石5とコイル25を使用し、永
久磁石5の磁界を巧みに利用してこの永久磁石5
を回転駆動できるので、従来よりもローコストの
外部磁界反転装置を実現できる。 First, a permanent magnet 5 and a coil 25 are used, and the magnetic field of the permanent magnet 5 is skillfully utilized to create a permanent magnet 5.
Since the external magnetic field reversal device can be rotationally driven, it is possible to realize a lower cost external magnetic field reversal device than conventional ones.
第2に、永久磁石5に対する回転力の殆どは永
久磁石5自身の磁束によるため、コイル25には
回転力を得るための僅かな電流を流すだけでよ
く、従つてこの発明に係る装置20は消費電力を
大幅に削減できる。 Secondly, since most of the rotational force on the permanent magnet 5 is due to the magnetic flux of the permanent magnet 5 itself, only a small amount of current needs to be passed through the coil 25 to obtain the rotational force. Therefore, the device 20 according to the present invention Power consumption can be significantly reduced.
第3に、従来に比しモータなどのような消耗部
品を構成部品として使用していないために、装置
寿命が延び、信頼性に富む装置を提供できる。 Thirdly, since consumable parts such as motors are not used as components compared to the past, the life of the device is extended and a highly reliable device can be provided.
第4に、モータ7の替わりにコイル25を設け
るだけであるから、装置の小型化を図り得る。 Fourthly, since only the coil 25 is provided in place of the motor 7, the device can be made smaller.
第5に、光ピツクアツプ装置2は外部磁界反転
装置20と別体に構成されているために、保守点
検が容易である。例えば、特開昭57−133537号公
報に開示された構成は、光ピツクアツプ装置と外
部磁界反転装置とが一体になつているため、光ピ
ツクアツプ装置のみが故障したような場合にも、
その全体を取り替えたり、点検したりする必要が
あるからである。 Fifth, since the optical pickup device 2 is constructed separately from the external magnetic field reversal device 20, maintenance and inspection are easy. For example, in the configuration disclosed in Japanese Patent Application Laid-Open No. 57-133537, the optical pickup device and the external magnetic field reversal device are integrated, so even if only the optical pickup device fails,
This is because the entire structure needs to be replaced or inspected.
第6に、第2図に示すように、磁界反転検出手
段を取り付ければ、永久磁石5の極性反転を確認
できるため、レーザーの照射状態を正確に制御で
きる。 Sixthly, as shown in FIG. 2, if a magnetic field reversal detecting means is attached, it is possible to confirm the polarity reversal of the permanent magnet 5, so that the laser irradiation state can be accurately controlled.
第1図はこの発明に係る外部磁界反転装置の一
例を示す平面図、第2図はその横断面図、第3図
はその縦断面図、第4図は永久磁石の一例を示す
斜視図、第5図はこの外部磁界反転装置を実装し
た光磁気デイスク装置の一例を示す一部の断面
図、第6図、第7図及び第9図は夫々この発明の
他の例を示す平面図若しくは断面図、第8図及び
第10図は第7図及び第9図の各縦断面図、第1
1図及び第12図は光磁気記録の概念的説明図、
第13図は従来の外部磁界反転装置の一例を示す
構成図、第14図はその動作状態を示すその一部
の図である。
1は光磁気デイスク、2は光ピツクアツプ装
置、20は外部磁界反転装置、5は外部磁界形成
手段たる永久磁石、22はその回転軸、25はコ
イル、30は鉄片、33は短絡コイル、Lcはコ
イルの中心、Lmは永久磁石5の中心である。
FIG. 1 is a plan view showing an example of an external magnetic field reversal device according to the present invention, FIG. 2 is a cross-sectional view thereof, FIG. 3 is a longitudinal cross-sectional view thereof, and FIG. 4 is a perspective view showing an example of a permanent magnet. FIG. 5 is a partial sectional view showing an example of a magneto-optical disk device equipped with this external magnetic field reversal device, and FIGS. 6, 7, and 9 are plan views showing other examples of the present invention, respectively. The sectional views, FIGS. 8 and 10, are the longitudinal sectional views of FIGS. 7 and 9, and
1 and 12 are conceptual explanatory diagrams of magneto-optical recording,
FIG. 13 is a configuration diagram showing an example of a conventional external magnetic field reversal device, and FIG. 14 is a partial diagram showing its operating state. 1 is a magneto-optical disk, 2 is an optical pickup device, 20 is an external magnetic field reversal device, 5 is a permanent magnet serving as an external magnetic field forming means, 22 is its rotating shaft, 25 is a coil, 30 is an iron piece, 33 is a short-circuit coil, and Lc is a The center of the coil, Lm, is the center of the permanent magnet 5.
Claims (1)
て対向配置され、このデイスク面を垂直に通過す
る外部磁界を得る回転自在な永久磁石と、 この永久磁石を囲繞してコイルが配され、 このコイルへの通電によつて生ずる磁界と上記
永久磁石の磁界とによる反発力によつて発生する
上記永久磁石に加わる回転力でこの永久磁石を半
回転させることにより、上記永久磁石による外部
磁界の向きを反転するようにした光磁気デイスク
装置用外部磁界反転装置。[Scope of Claims] 1. A rotatable permanent magnet that is arranged opposite to the magneto-optical disk surface at a predetermined distance and that receives an external magnetic field that passes perpendicularly to the disk surface; A coil is disposed, and the permanent magnet is rotated by half a rotation with the rotational force applied to the permanent magnet generated by the repulsion between the magnetic field generated by energizing the coil and the magnetic field of the permanent magnet. An external magnetic field reversal device for a magneto-optical disk device that reverses the direction of an external magnetic field generated by a magnet.
Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP60091992A JPS61250801A (en) | 1985-04-29 | 1985-04-29 | Device of reversing external magnetic field for optomagnetic disc device |
US07/012,458 US4748606A (en) | 1985-04-29 | 1986-04-28 | External magnetic field inverting apparatus for magneto-optical disc apparatus |
DE8686902518T DE3687694T2 (en) | 1985-04-29 | 1986-04-28 | EXTERNAL MAGNETIC FIELD REVOLUTION DEVICE FOR PHOTOMAGNETIC PLATES. |
EP92100047A EP0485359B1 (en) | 1985-04-29 | 1986-04-28 | An external magnetic field inverting apparatus for a magneto-optical disc apparatus |
PCT/JP1986/000216 WO1986006534A1 (en) | 1985-04-29 | 1986-04-28 | External magnetic field reversing apparatus for photomagnetic disks |
DE3650686T DE3650686T2 (en) | 1985-04-29 | 1986-04-28 | External magnetic field reversing device for magneto-optical disk device |
EP86902518A EP0222916B1 (en) | 1985-04-29 | 1986-04-28 | External magnetic field reversing apparatus for photomagnetic disks |
KR1019860700953A KR940005552B1 (en) | 1985-04-29 | 1986-04-28 | External magnetic field reversing apparatus and processing method thereof |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP60091992A JPS61250801A (en) | 1985-04-29 | 1985-04-29 | Device of reversing external magnetic field for optomagnetic disc device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS61250801A JPS61250801A (en) | 1986-11-07 |
JPH0560162B2 true JPH0560162B2 (en) | 1993-09-01 |
Family
ID=14041937
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP60091992A Granted JPS61250801A (en) | 1985-04-29 | 1985-04-29 | Device of reversing external magnetic field for optomagnetic disc device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS61250801A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19532209B4 (en) * | 1994-09-01 | 2005-05-04 | Pentax Corp. | Magneto-optic disk device |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62209751A (en) * | 1986-03-10 | 1987-09-14 | Matsushita Electric Ind Co Ltd | Photomagnetic recorder |
JPH0727606B2 (en) * | 1986-12-11 | 1995-03-29 | ソニー株式会社 | Magnetic field application device for recordable optical disk |
JPH0661122B2 (en) * | 1987-05-08 | 1994-08-10 | シャープ株式会社 | Magneto-optical disk device |
JPS63317903A (en) * | 1987-06-22 | 1988-12-26 | Mitsubishi Electric Corp | Bias magnetic field impressing device |
JPH0633526Y2 (en) * | 1988-11-10 | 1994-08-31 | ティアツク株式会社 | Magneto-optical disk device |
-
1985
- 1985-04-29 JP JP60091992A patent/JPS61250801A/en active Granted
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19532209B4 (en) * | 1994-09-01 | 2005-05-04 | Pentax Corp. | Magneto-optic disk device |
Also Published As
Publication number | Publication date |
---|---|
JPS61250801A (en) | 1986-11-07 |
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