JPH04325950A - Magnetic head for magneto-optical recording - Google Patents
Magnetic head for magneto-optical recordingInfo
- Publication number
- JPH04325950A JPH04325950A JP9754091A JP9754091A JPH04325950A JP H04325950 A JPH04325950 A JP H04325950A JP 9754091 A JP9754091 A JP 9754091A JP 9754091 A JP9754091 A JP 9754091A JP H04325950 A JPH04325950 A JP H04325950A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- magneto
- coil
- magnetic head
- main
- 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.)
- Withdrawn
Links
- 230000005284 excitation Effects 0.000 claims description 18
- 239000000696 magnetic material Substances 0.000 claims description 5
- 230000004907 flux Effects 0.000 description 12
- 238000010586 diagram Methods 0.000 description 4
- 230000005415 magnetization Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000012141 concentrate Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 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 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910000808 amorphous metal alloy Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 229910000702 sendust Inorganic materials 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Landscapes
- Recording Or Reproducing By Magnetic Means (AREA)
Abstract
Description
【0001】0001
【産業上の利用分野】本発明は、光磁気記録媒体に対し
て変調磁界を印加して記録信号の重書き(オーバライト
)を可能にする光磁気記録用磁気ヘッドに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head for magneto-optical recording that applies a modulated magnetic field to a magneto-optical recording medium to enable overwriting of recording signals.
【0002】0002
【従来の技術およびその課題】光磁気ディスクのような
光磁気記録媒体に対し、情報の消去および記録を同時に
行うオーバライト技術の1つとして図7に示すような磁
界変調方式が知られている。これは、光磁気ディスク1
6の垂直磁化膜14に、半導体レーザ18から照射され
た一定のレーザ光をディスク基板15を経てレンズ17
により集光させ上記垂直磁化膜14の温度をこの磁化膜
14のキューリー点以上に上げておき、磁気ヘッド11
からの磁界を磁界変調回路13を介して記録信号に応じ
て変調し上記磁化膜14に磁界の変化に応じた磁気パタ
ーンを残すことにより情報の記録を行うものである。[Prior Art and its Problems] A magnetic field modulation method as shown in FIG. 7 is known as one of the overwrite techniques for simultaneously erasing and recording information on a magneto-optical recording medium such as a magneto-optical disk. . This is magneto-optical disk 1
A constant laser beam irradiated from a semiconductor laser 18 is applied to the perpendicularly magnetized film 14 of No. 6 through a lens 17 through a disk substrate 15.
The temperature of the perpendicularly magnetized film 14 is raised above the Curie point of this magnetized film 14, and the magnetic head 11
Information is recorded by modulating the magnetic field from the magnetic field via a magnetic field modulation circuit 13 in accordance with a recording signal and leaving a magnetic pattern in the magnetized film 14 in accordance with changes in the magnetic field.
【0003】上述した磁界変調方式で情報の記録を行う
場合、垂直磁化膜14の磁化を反転させるのに必要な磁
界は膜特性にも依存するが、一般に数百Oe 以上の磁
界が必要である。しかも、光磁気記録の非接触の利点を
生かすためには、磁気ヘッド11は、光磁気ディスク1
6より数百μm以上離す必要があり、そのために磁気ヘ
ッド11には、数十アンペアターン以上の大きな起磁力
が要求される。また、高密度記録を達成するためには、
ヘッド発生磁界の立ち上がり時間も十分に速くする必要
がある。When recording information using the magnetic field modulation method described above, the magnetic field required to reverse the magnetization of the perpendicularly magnetized film 14 depends on the film characteristics, but generally a magnetic field of several hundred Oe or more is required. . Moreover, in order to take advantage of the non-contact advantage of magneto-optical recording, the magnetic head 11 must be connected to the magneto-optical disk.
Therefore, the magnetic head 11 is required to have a large magnetomotive force of several tens of ampere turns or more. In addition, in order to achieve high density recording,
It is also necessary to make the rise time of the head-generated magnetic field sufficiently fast.
【0004】このような磁界変調記録用の磁気ヘッドと
しては、光磁気ディスクに垂直に磁界を与える必要から
、一般に図8に示すような形状の主磁極励磁型磁気ヘッ
ドが用いられる。主磁極21には、この主磁極を励磁す
るための巻数Nのコイル23が巻回されており、主磁極
21は、その端部において対向する光磁気ディスク16
に磁界を印加するようになっている。主磁極21の基部
は、この主磁極21と磁気的に結合され、コイル23を
取り囲むように形成されたヨーク部22に連結されてい
る。As a magnetic head for such magnetic field modulation recording, a main pole excitation type magnetic head having a shape as shown in FIG. 8 is generally used because it is necessary to apply a magnetic field perpendicularly to the magneto-optical disk. A coil 23 having a number of turns N for exciting the main magnetic pole is wound around the main magnetic pole 21, and the main magnetic pole 21 has an opposite magneto-optical disk 16 at its end.
A magnetic field is applied to the The base of the main magnetic pole 21 is magnetically coupled to the main magnetic pole 21 and connected to a yoke portion 22 formed to surround the coil 23 .
【0005】このコイル23に、記録信号に応じて変化
する励磁電流Iを流すと、光磁気ディスク16に対向す
る主磁極21から記録信号に応じた磁界が発生し、光磁
気ディスク16の垂直磁化膜を磁化することができる。When an excitation current I that changes according to a recording signal is passed through this coil 23, a magnetic field corresponding to the recording signal is generated from the main magnetic pole 21 facing the magneto-optical disk 16, and the perpendicular magnetization of the magneto-optical disk 16 is generated. The film can be magnetized.
【0006】図8に示す主磁極励磁型磁気ヘッドにおい
ては、コイル23の巻数Nを増やし励磁電流Iを大きく
すれば、光磁気ディスク16上の磁化を反転させるのに
十分な磁界強度を得ることができる。しかし、この場合
には、主磁極21、ヨーク部22での損失やコイル23
での損失が増加するために、磁気ヘッドで発熱が生じヘ
ッドの磁性材料の特性が劣化したり、コイルの絶縁被膜
が熱的に破壊される問題があった。そこで、ヘッドの記
録効率を上げてヘッドに印加される起磁力NIに対する
主磁極発生磁束量を増加させる磁気ヘッドが提案されて
いる。In the main pole excitation type magnetic head shown in FIG. 8, by increasing the number of turns N of the coil 23 and increasing the excitation current I, a magnetic field strength sufficient to reverse the magnetization on the magneto-optical disk 16 can be obtained. Can be done. However, in this case, the loss in the main pole 21 and the yoke part 22 and the loss in the coil 23
As a result, the magnetic head generates heat, causing problems such as deterioration of the characteristics of the magnetic material of the head and thermal destruction of the insulating coating of the coil. Therefore, a magnetic head has been proposed that increases the recording efficiency of the head and increases the amount of magnetic flux generated at the main pole relative to the magnetomotive force NI applied to the head.
【0007】特開昭63−53703号公報には、図9
(a)、(b)に示すような磁気ヘッドが開示されてい
る。この磁気ヘッドは、コイル23が巻回された主磁極
21を取り囲むようにしてヨーク部22が形成されてお
り、このヨーク部22は、光磁気記録媒体面側で主磁極
21へ向けて延在されており所要のギャップgを形成し
ている。このように、コイル23を囲む磁気回路の磁気
抵抗を小さくして、コイル23で与える一定の起磁力N
I当りの磁束量を増大させている。[0007] Japanese Unexamined Patent Publication No. 63-53703 discloses FIG.
Magnetic heads as shown in (a) and (b) have been disclosed. In this magnetic head, a yoke portion 22 is formed to surround a main magnetic pole 21 around which a coil 23 is wound, and this yoke portion 22 extends toward the main magnetic pole 21 on the side of the magneto-optical recording medium. The required gap g is formed. In this way, the magnetic resistance of the magnetic circuit surrounding the coil 23 is reduced, and the constant magnetomotive force N exerted by the coil 23 is reduced.
The amount of magnetic flux per I is increased.
【0008】このような構造の磁気ヘッドにおいて、上
記磁気回路の磁気抵抗を減少するには、コイル23の断
面積を小さくしてヨーク部22が主磁極21を囲む経路
の長さを短くし、かつヨーク部22の肉厚を厚くするこ
とが望ましい。しかしながらコイル23の断面積は、必
要な起磁力を得るための巻数と、コイルでの高周波にお
ける抵抗増加にともなう銅損の増加を考慮すると、ある
程度の大きさ以上が必要であり、ヨーク部の肉厚は、磁
気ヘッド全体の大きさにより決まるといった制約を受け
るため、記録効率の向上には限界があった。In the magnetic head having such a structure, in order to reduce the magnetic resistance of the magnetic circuit, the cross-sectional area of the coil 23 is made small to shorten the length of the path along which the yoke part 22 surrounds the main magnetic pole 21. It is also desirable to increase the thickness of the yoke portion 22. However, the cross-sectional area of the coil 23 needs to be larger than a certain degree, considering the number of turns to obtain the necessary magnetomotive force and the increase in copper loss due to the increase in resistance at high frequencies in the coil. Since the thickness is determined by the overall size of the magnetic head, there is a limit to the improvement in recording efficiency.
【0009】また、特開昭64−66807号公報には
、図10(a),(b)に示すような磁気ヘッドが開示
されている。この磁気ヘッドは、ヨーク部22を複数の
細長い棒状体にし、この複数の棒状体にそれぞれコイル
23を巻回してその先端から発生する磁界を光磁気記録
媒体上で一点Pに集中させるように構成されている。Furthermore, Japanese Patent Laid-Open No. 64-66807 discloses a magnetic head as shown in FIGS. 10(a) and 10(b). This magnetic head has a configuration in which the yoke portion 22 is formed into a plurality of elongated rod-like bodies, and a coil 23 is wound around each of the plurality of rod-like bodies so that the magnetic field generated from the tip thereof is concentrated at one point P on the magneto-optical recording medium. has been done.
【0010】この構造によれば、磁界を個々の細棒状コ
アから光磁気記録媒体の一点に集中させることができる
ので、記録磁界の収束効率の向上を図ることができる。
またそれぞれの細棒状コアのコア径は十分に小さくされ
ており、これらのコアからの磁界発生を並列接続したコ
イルにより行うため、磁気ヘッド全体のインダクタンス
を小さくすることができ、高周波でも励磁電流を流し易
くしている。[0010] According to this structure, the magnetic field can be concentrated at one point on the magneto-optical recording medium from each thin rod-shaped core, so that the convergence efficiency of the recording magnetic field can be improved. In addition, the core diameter of each thin rod-shaped core is made sufficiently small, and since the magnetic field generation from these cores is performed by coils connected in parallel, the inductance of the entire magnetic head can be reduced, and the excitation current can be maintained even at high frequencies. Makes it easy to flush.
【0011】しかしながら、この様な構造の磁気ヘッド
においては、ヨーク部22の配置の関係から、細棒状コ
ア1本のコイルの回りに形成される磁気回路は、細棒状
コアが長いこと、コア断面積が小さいこと、および磁束
が通る空間部分が大きいことにより、磁気抵抗が大きく
なり、ヨーク部コア1本当たりの発生できる磁界が小さ
くなる。この磁界が減少する傾向は、主磁極21より離
れたコアほど顕著である。従って所要の記録磁界を得る
ためには多くの細棒状コアを必要する。このため所要の
記録磁界を得ようとすると、ヘッド形状が複雑になる上
、大型化する問題があり、この例においても記録効率の
向上には限界があった。However, in a magnetic head having such a structure, due to the arrangement of the yoke portion 22, the magnetic circuit formed around the coil of one thin rod-like core is difficult to form due to the long thin rod-like core and the possibility of core breakage. Since the area is small and the space through which the magnetic flux passes is large, the magnetic resistance becomes large, and the magnetic field that can be generated per yoke core becomes small. This tendency for the magnetic field to decrease is more pronounced as the core is farther away from the main magnetic pole 21. Therefore, many thin rod-shaped cores are required to obtain the required recording magnetic field. Therefore, in order to obtain the required recording magnetic field, there is a problem that the head shape becomes complicated and the size increases, and even in this example, there is a limit to the improvement of recording efficiency.
【0012】この発明は、上述した問題点に鑑みて成さ
れたもので、磁気ヘッドの記録効率を高め、主磁極から
発生する磁界強度を向上させる光磁気記録用磁気ヘッド
を提供することを目的としている。The present invention has been made in view of the above-mentioned problems, and an object thereof is to provide a magnetic head for magneto-optical recording that increases the recording efficiency of the magnetic head and improves the strength of the magnetic field generated from the main pole. It is said that
【0013】[0013]
【課題を解決するための手段】前記課題を解決するため
に、本発明の光磁気記録用磁気ヘッドは、光磁気記録媒
体に対向し、磁界を印加する主磁極と、一端で前記主磁
極と磁気的に結合され、他端が複数に分割されて前記光
磁気記録媒体に対向するヨーク部と、前記分割されたヨ
ーク部に巻回されたコイルとを有し、前記主磁極とヨー
ク部が、前記コイルを挟むように近接して配設されてい
ることを特徴としている。[Means for Solving the Problems] In order to solve the above problems, the magnetic head for magneto-optical recording of the present invention has a main magnetic pole that faces a magneto-optical recording medium and applies a magnetic field, and a main magnetic pole that is connected to the main magnetic pole at one end. It has a yoke part that is magnetically coupled and whose other end is divided into a plurality of parts and faces the magneto-optical recording medium, and a coil wound around the divided yoke part, and the main magnetic pole and the yoke part are connected to each other. , are arranged close to each other so as to sandwich the coil.
【0014】[0014]
【作用】ヨーク部を複数に分割し、これらのヨーク部に
コイルを巻回し、このコイルが巻回されたヨーク部で発
生する磁束を主磁極に集中させる。またコイルを分割し
てヨーク部に巻回させ、コイルの占める体積を減らして
主磁極とヨーク部を近接させる。[Operation] The yoke part is divided into a plurality of parts, a coil is wound around these yoke parts, and the magnetic flux generated in the yoke part around which the coil is wound is concentrated on the main magnetic pole. In addition, the coil is divided and wound around the yoke to reduce the volume occupied by the coil and bring the main pole and yoke closer together.
【0015】[0015]
【実施例】以下、本発明の実施例を添付図面に沿って具
体的に説明する。
(第1実施例)Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. (First example)
【0016】図1、図2および図3は、本発明に係る光
磁気記録用磁気ヘッド(以下、磁気ヘッド)の第1の実
施例を示したもので、図1は斜視図、図2は図1におけ
る磁気ヘッドのII−II 線に沿った断面図である。1, 2 and 3 show a first embodiment of a magnetic head for magneto-optical recording (hereinafter referred to as a magnetic head) according to the present invention, with FIG. 1 being a perspective view and FIG. 2 being a perspective view. FIG. 2 is a cross-sectional view of the magnetic head in FIG. 1 taken along line II-II.
【0017】円板状に形成された保持部30の上面の中
心部には、円柱状の主磁極31が突出している。また保
持部30の上面には、この主磁極31を取り囲むように
して放射状に同一形状でn個(本実施例では8個)のヨ
ーク部32a〜32hが突出している。これらの主磁極
、ヨーク部、保持部は、高周波での磁気得性の優れた材
質、例えばフェライト、センダスト合金、アモルファス
合金等の軟性磁性材により構成されている。すなわち、
ヨーク部32a〜32hは、円柱状に形成された軟性磁
性材のブロックの光磁気ディスク16に対向している側
の輪帯領域を8個に分割して形成されている。また、こ
れらのヨーク部は光磁気ディスク16に対向していない
側(保持部30側)で主磁極31と磁気的に結合してい
る。各ヨーク部には、励磁用コイル33が巻回されてお
り、ヨーク部32a〜32hおよび主磁極31は、この
コイル33を挟むようにして近接して配置されている。
また、各ヨーク部32a〜32hおよび主磁極31は、
それらの先端面が光磁気ディスク16の媒体面に対し所
定間隔をおいて同一平面上となるように形成されている
。A cylindrical main pole 31 protrudes from the center of the upper surface of the disc-shaped holding portion 30 . Further, n (in this embodiment, eight) yoke parts 32a to 32h of the same shape radially protrude from the upper surface of the holding part 30 so as to surround the main pole 31. The main pole, yoke portion, and holding portion are made of a material with excellent magnetic properties at high frequencies, such as a soft magnetic material such as ferrite, sendust alloy, and amorphous alloy. That is,
The yoke portions 32a to 32h are formed by dividing the annular region of the cylindrical block of soft magnetic material on the side facing the magneto-optical disk 16 into eight pieces. Further, these yoke portions are magnetically coupled to the main magnetic pole 31 on the side not facing the magneto-optical disk 16 (the holding portion 30 side). An excitation coil 33 is wound around each yoke portion, and the yoke portions 32a to 32h and the main magnetic pole 31 are arranged close to each other so as to sandwich the coil 33 therebetween. Further, each yoke portion 32a to 32h and the main magnetic pole 31 are
The leading end surfaces thereof are formed on the same plane with a predetermined distance from the medium surface of the magneto-optical disk 16.
【0018】ここで、各コイル33に同一方向に励磁電
流を流すと、各ヨーク部32a〜32hで発生した磁束
は、各コイル33の回りに形成される磁気回路を流れ、
主磁極31には各ヨーク部からの磁束が集中する。この
時、n個に分割された(この実施例ではn=8)ヨーク
部の1つ当たりの磁束の通る断面積が主磁極31の磁束
の通る断面積と同等以上であるとすると、主磁極31だ
けにコイルを巻いた場合で印加起磁力NIで発生させる
主磁極磁界と同等の磁界を得るには、各コイルでNI/
nの起磁力を発生させれば良いことになる。Here, when an excitation current is passed through each coil 33 in the same direction, the magnetic flux generated at each yoke portion 32a to 32h flows through a magnetic circuit formed around each coil 33,
Magnetic flux from each yoke portion concentrates on the main magnetic pole 31 . At this time, assuming that the cross-sectional area through which the magnetic flux passes through each of the n-divided yoke portions (n = 8 in this embodiment) is equal to or greater than the cross-sectional area through which the magnetic flux of the main magnetic pole 31 passes, the main magnetic pole In order to obtain a magnetic field equivalent to the main pole magnetic field generated by the applied magnetomotive force NI when winding a coil only around 31, each coil should have NI/
It is sufficient to generate a magnetomotive force of n.
【0019】即ち、各コイル33の巻数や励磁電流を減
らすことができるので、主磁極31だけにコイルを巻回
する場合より、各コイル33の占める断面積は大幅に減
少しその分、主磁極とヨーク部とを接近させることが可
能となる。この場合、主磁極に巻回されるコイルの占め
る体積が小さくて、他のヨーク部コイルを巻回するのに
支障がなければ、主磁極31にコイルを巻回してもよい
。That is, since the number of turns and excitation current of each coil 33 can be reduced, the cross-sectional area occupied by each coil 33 is significantly reduced compared to the case where the coil is wound only around the main pole 31, and the main pole It becomes possible to bring the yoke portion and the yoke portion closer to each other. In this case, if the volume occupied by the coil wound around the main pole is small and there is no problem in winding other yoke portion coils, the coil may be wound around the main pole 31.
【0020】この結果、主磁極31とヨーク部32a〜
32hおよび光磁気ディスク16近傍の空間からなるコ
イル33の回りの磁気回路の磁気抵抗は磁路が短くなる
ので減少する。このため、磁気回路を流れる磁束量が増
加し、主磁極31での磁界も増加する。このように、本
実施例の磁気ヘッドでは、主磁極とヨーク部との距離が
離れている従来の磁気ヘッドと比べ、主磁極とヨーク部
とを近接させることができるため、磁気ヘッドの外形を
大きくしなくても容易に主磁極の発生磁界強度を大きく
でき、記録効率を向上させることができる。As a result, the main magnetic pole 31 and the yoke portions 32a~
The magnetic resistance of the magnetic circuit around the coil 33 consisting of the space near the magneto-optical disk 16 decreases because the magnetic path becomes shorter. Therefore, the amount of magnetic flux flowing through the magnetic circuit increases, and the magnetic field at the main magnetic pole 31 also increases. In this way, in the magnetic head of this example, compared to the conventional magnetic head in which the main pole and the yoke part are far apart, the main pole and the yoke part can be brought closer together, so the external shape of the magnetic head can be reduced. The strength of the magnetic field generated by the main pole can be easily increased without increasing it, and recording efficiency can be improved.
【0021】また、各コイル33を駆動するには、それ
ぞれのコイルに単独に記録励磁電流を流しても良いが、
図3に示すように各コイルの一部または全部を並列接続
して記録励磁電流を流すようにしても良い。こうすれば
各コイルのインダクタンスをLとすると、接続したコイ
ル全体のインダクタンスは理想的にはL/nとなり、高
周波励磁に対しても磁気ヘッドのインピーダンスが小さ
く、励磁回路の負担が減少し、低消費電力で高記録密度
の記録が可能となる。
(第2実施例)図4は、本発明に係る磁気ヘッドの第2
の実施例を示した斜視図である。Furthermore, in order to drive each coil 33, a recording excitation current may be applied to each coil individually;
As shown in FIG. 3, some or all of the coils may be connected in parallel to flow the recording excitation current. In this way, if the inductance of each coil is L, the inductance of the entire connected coils will ideally be L/n, and the impedance of the magnetic head will be small even with high frequency excitation, reducing the burden on the excitation circuit and reducing the High recording density recording is possible with low power consumption. (Second Embodiment) FIG. 4 shows a second embodiment of the magnetic head according to the present invention.
FIG. 2 is a perspective view showing an embodiment of the invention.
【0022】矩形状に形成された保持部30の上面の中
心部には、角柱状の主磁極31が突出している。また保
持部30の上面には、この主磁極31を取り囲むように
して直方体状の8個のヨーク部32a〜32hが突出し
ている。これらの主磁極31およびヨーク部32a〜3
2hは、フェライト等の軟磁性体からなる直方体ブロッ
クの縦方向および横方向に、それぞれ平行な2本の溝を
互いにクロスするように刻むことによって形成すること
ができる。これらのヨーク部32a〜32hは保持部3
0によって主磁極31と磁気的に結合している。また、
主磁極31に近接した4つのヨーク部32b,32d,
32f,32hには、それぞれ励磁用コイル33が巻回
されている。A prismatic main pole 31 protrudes from the center of the upper surface of the rectangular holding portion 30. Moreover, eight rectangular parallelepiped-shaped yoke parts 32a to 32h protrude from the upper surface of the holding part 30 so as to surround the main pole 31. These main magnetic poles 31 and yoke parts 32a to 3
2h can be formed by cutting two parallel grooves in the vertical and horizontal directions of a rectangular parallelepiped block made of a soft magnetic material such as ferrite so as to cross each other. These yoke parts 32a to 32h are the holding part 3
0, it is magnetically coupled to the main magnetic pole 31. Also,
Four yoke parts 32b, 32d close to the main pole 31,
An excitation coil 33 is wound around each of 32f and 32h.
【0023】ここで、各コイル33に同一方向に励磁電
流を流すと、各ヨーク部で発生した磁束は、各コイル3
3の回りに形成される磁気回路を流れ、主磁極31には
各ヨーク部からの磁束が集中する。本実施例においても
、第1の実施例と同様、各コイル33の巻数や励磁電流
を減らすことができるので、主磁極31だけにコイルを
巻回する場合より、各コイル33の占める断面積を大幅
に減少させることができる。また、この実施例では、主
磁極31に最も近接しているヨーク部にコイルを巻回し
ているが、さらに記録効率を上げるために、主磁極およ
び周囲の8つのヨーク部全部にコイルを巻回しても良い
。Here, when an excitation current is passed through each coil 33 in the same direction, the magnetic flux generated at each yoke portion is
The magnetic flux from each yoke portion flows through a magnetic circuit formed around the main magnetic pole 31 and concentrates on the main magnetic pole 31. In this embodiment, as in the first embodiment, the number of turns and excitation current of each coil 33 can be reduced, so the cross-sectional area occupied by each coil 33 can be reduced compared to the case where the coil is wound only around the main pole 31. can be significantly reduced. Furthermore, in this embodiment, the coil is wound around the yoke portion closest to the main magnetic pole 31, but in order to further increase recording efficiency, the coil is wound around the main magnetic pole and all eight surrounding yoke portions. It's okay.
【0024】本実施例は、基本的には第1の実施例と同
様な構造を成しているが、直方体の磁性ブロックを溝入
れ加工するだけで容易に主磁極、ヨーク部を形成するこ
とができるようになっている。このように、簡単な加工
で作製できる量産に適した形状としたことにより、高い
記録効率の磁気ヘッドを安価で容易に得ることができる
。
(第3実施例)This embodiment basically has the same structure as the first embodiment, but the main pole and yoke portion can be easily formed by simply grooving a rectangular parallelepiped magnetic block. is now possible. In this way, by creating a shape suitable for mass production that can be manufactured by simple processing, a magnetic head with high recording efficiency can be easily obtained at low cost. (Third example)
【0025】図5は、本発明に係る磁気ヘッドの第3の
実施例を示した斜視図である。この実施例は、前記第2
実施例とその外観が同一であるために、詳細な説明は省
略し構造的に異なる部分について説明をする。FIG. 5 is a perspective view showing a third embodiment of the magnetic head according to the present invention. In this embodiment, the second
Since the external appearance is the same as that of the embodiment, a detailed explanation will be omitted and structurally different parts will be explained.
【0026】この磁気ヘッドは、第2実施例で示したヨ
ーク部32a,32c,32e,32gの部分、すなわ
ち、コイルが巻回されていなかったヨーク部が永久磁石
51によって形成されている。これらの永久磁石51は
、光磁気ディスクに対し垂直な方向に、上向きまたは下
向きに磁化された状態で、他のヨーク部32b,32d
,32f,32hと同様に主磁極31と磁気的に結合し
ている。従って、主磁極31での磁界は、図6に示すよ
うに、ヨーク部32b,32d,32f,32hで発生
する記録信号に応じた高周波磁界HACと、永久磁石5
1により発生する書き込み方向あるいは消去方向の一定
磁界HDCとが重畳されたものになる。In this magnetic head, the yoke portions 32a, 32c, 32e, and 32g shown in the second embodiment, that is, the yoke portions where no coil is wound, are formed of a permanent magnet 51. These permanent magnets 51 are magnetized upward or downward in a direction perpendicular to the magneto-optical disk, and are attached to the other yoke parts 32b, 32d.
, 32f, and 32h, they are magnetically coupled to the main magnetic pole 31. Therefore, as shown in FIG. 6, the magnetic field at the main pole 31 is composed of a high frequency magnetic field HAC corresponding to the recording signal generated at the yoke portions 32b, 32d, 32f, and 32h, and a permanent magnet 5.
The constant magnetic field HDC in the writing direction or the erasing direction generated by No. 1 is superimposed.
【0027】すなわち、磁気ヘッドに光磁気ディスクを
介して対向する光ピックアップの集光レンズを駆動する
アクチュエータや、磁気ヘッドを移動させるためのアク
チュエータからの漏洩磁界が光磁気ディスクや磁気ヘッ
ドに印加されても、永久磁石の磁化量を調整することに
より、光磁気ディスク上で相殺できる。なお、この永久
磁石の代わりに、第2の実施例のようにヨーク部32a
,32c,32e,32gを配してそれぞれのヨーク部
にコイルを巻回し、直流電流を流して一定の磁界を印加
するように構成しても良い。従って、本実施例の磁気ヘ
ッドを用いれば、磁気ヘッド近傍に他の装置からの漏洩
磁界があっても、その影響を無くして安定した記録が可
能になる。That is, a leakage magnetic field from an actuator for driving a condensing lens of an optical pickup that faces a magnetic head via a magneto-optical disk or an actuator for moving a magnetic head is applied to a magneto-optical disk or a magnetic head. However, by adjusting the amount of magnetization of the permanent magnet, it can be canceled out on the magneto-optical disk. Note that instead of this permanent magnet, a yoke portion 32a is used as in the second embodiment.
, 32c, 32e, and 32g, a coil may be wound around each yoke portion, and a constant magnetic field may be applied by passing a direct current. Therefore, by using the magnetic head of this embodiment, even if there is a leakage magnetic field from other devices near the magnetic head, the influence of the leakage magnetic field is eliminated and stable recording is possible.
【0028】以上、本発明の実施例を具体化して説明し
たが、本発明は上記実施例に限定されるものではない。
例えば、コイルが巻回されるヨーク部の位置、光磁気デ
ィスクに対向するヨーク部の形状、あるいはコイルの結
線方法等、種々変形実施することが可能である。また、
もちろん本発明は、光磁気ディスクに限らず磁気記録媒
体を用いたあらゆる装置に使用することができる。Although the embodiments of the present invention have been explained above, the present invention is not limited to the above embodiments. For example, various modifications can be made to the position of the yoke around which the coil is wound, the shape of the yoke facing the magneto-optical disk, the method of wiring the coil, etc. Also,
Of course, the present invention can be used not only for magneto-optical disks but also for any device using a magnetic recording medium.
【0029】[0029]
【発明の効果】以上説明したように、本発明の光磁気記
録用磁気ヘッドは、ヨーク部を複数に分割し、これらの
ヨークにコイルを巻回してヨーク部で発生する磁束を主
磁極に集中させている。従って、主磁極から発生する磁
界強度を向上させることができる。また、コイルを分割
したことにより、コイルの占める体積を減らして主磁極
とヨーク部とを近接させたために、磁気ヘッドの外形が
小さくても、コイルの回りに形成される磁気回路の磁気
抵抗を減少でき、印加起磁力当たりの主磁極発生磁界が
大きくなり、磁気ヘッドの記録効率が向上する。従って
、本発明の磁気ヘッドを用いれば、コイルに流す励磁電
流は少なくて良く、電流増加に伴う磁気ヘッドやヘッド
の励磁回路の損失を低減できる。[Effects of the Invention] As explained above, in the magnetic head for magneto-optical recording of the present invention, the yoke portion is divided into a plurality of parts, a coil is wound around these yokes, and the magnetic flux generated in the yoke portion is concentrated on the main magnetic pole. I'm letting you do it. Therefore, the strength of the magnetic field generated from the main pole can be improved. In addition, by dividing the coil, the volume occupied by the coil is reduced and the main magnetic pole and yoke are brought closer together, so even if the external size of the magnetic head is small, the magnetic resistance of the magnetic circuit formed around the coil can be reduced. As a result, the magnetic field generated by the main pole per applied magnetomotive force becomes larger, and the recording efficiency of the magnetic head improves. Therefore, by using the magnetic head of the present invention, only a small amount of excitation current is required to flow through the coil, and losses in the magnetic head and the excitation circuit of the head due to an increase in current can be reduced.
【図1】本発明に係る光磁気記録用磁気ヘッドの第1の
実施例を示す斜視図である。FIG. 1 is a perspective view showing a first embodiment of a magnetic head for magneto-optical recording according to the present invention.
【図2】図1に示す光磁気記録用磁気ヘッドのII−I
I 線に沿った断面図である。[Fig. 2] II-I of the magnetic head for magneto-optical recording shown in Fig. 1
FIG. 3 is a cross-sectional view taken along line I.
【図3】図1に示す光磁気記録用磁気ヘッドのコイルの
結線図の一例を示す図である。3 is a diagram showing an example of a coil connection diagram of the magneto-optical recording magnetic head shown in FIG. 1; FIG.
【図4】本発明に係る光磁気記録用磁気ヘッドの第2の
実施例を示す斜視図である。FIG. 4 is a perspective view showing a second embodiment of the magnetic head for magneto-optical recording according to the present invention.
【図5】本発明に係る光磁気記録用磁気ヘッドの第3の
実施例を示す斜視図である。FIG. 5 is a perspective view showing a third embodiment of the magneto-optical recording magnetic head according to the present invention.
【図6】図5に示す光磁気記録用磁気ヘッドの主磁極で
の磁界を示す図である。6 is a diagram showing the magnetic field at the main pole of the magneto-optical recording magnetic head shown in FIG. 5. FIG.
【図7】光磁気記録装置の概念を示す図である。FIG. 7 is a diagram showing the concept of a magneto-optical recording device.
【図8】従来の光磁気記録用磁気ヘッドを示す断面図で
ある。FIG. 8 is a sectional view showing a conventional magnetic head for magneto-optical recording.
【図9】(a)は別の従来の光磁気記録用磁気ヘッドを
示す斜視図でり、(b)はその断面図である。FIG. 9(a) is a perspective view showing another conventional magneto-optical recording magnetic head, and FIG. 9(b) is a sectional view thereof.
【図10】(a)は、また別の従来の光磁気記録用磁気
ヘッドを示す斜視図でり、(b)はその断面図である。FIG. 10(a) is a perspective view showing another conventional magnetic head for magneto-optical recording, and FIG. 10(b) is a sectional view thereof.
16…光磁気ディスク(光磁気記録媒体)、31…主磁
極、32a〜32h…ヨーク部、33…コイル。16... Magneto-optical disk (magneto-optical recording medium), 31... Main magnetic pole, 32a to 32h... Yoke portion, 33... Coil.
Claims (2)
する主磁極と、一端で前記主磁極と磁気的に結合され、
他端が複数に分割されて前記光磁気記録媒体に対向する
ヨーク部と、前記分割されたヨーク部に巻回されたコイ
ルとを有し、前記主磁極とヨーク部が、前記コイルを挟
むように近接して配設されていることを特徴とする光磁
気記録用磁気ヘッド。1. A main magnetic pole that faces a magneto-optical recording medium and applies a magnetic field, and a main magnetic pole that is magnetically coupled to the main magnetic pole at one end,
The other end has a yoke part that is divided into a plurality of parts and faces the magneto-optical recording medium, and a coil wound around the divided yoke part, and the main magnetic pole and the yoke part sandwich the coil. What is claimed is: 1. A magnetic head for magneto-optical recording, characterized in that the magnetic head is disposed in close proximity to the magneto-optical recording head.
体に対向する面側を分割して形成された複数のヨーク部
と、これらのヨーク部の内、少なくとも1つのヨーク部
から前記光磁気記録媒体に対して磁界を印加するように
、前記ヨーク部に巻回され励磁電流が流れることが可能
なコイルと、を有することを特徴とする光磁気記録用磁
気ヘッド。2. A plurality of yoke portions formed by dividing a surface of a magnetic material having a flat surface facing the magneto-optical recording medium; 1. A magnetic head for magneto-optical recording, comprising: a coil wound around the yoke portion and through which an excitation current can flow so as to apply a magnetic field to a recording medium.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9754091A JPH04325950A (en) | 1991-04-26 | 1991-04-26 | Magnetic head for magneto-optical recording |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9754091A JPH04325950A (en) | 1991-04-26 | 1991-04-26 | Magnetic head for magneto-optical recording |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH04325950A true JPH04325950A (en) | 1992-11-16 |
Family
ID=14195080
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP9754091A Withdrawn JPH04325950A (en) | 1991-04-26 | 1991-04-26 | Magnetic head for magneto-optical recording |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH04325950A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6327227B1 (en) * | 1997-08-08 | 2001-12-04 | Sharp Kabushiki Kaisha | Magnetic recorder/reproduction apparatus including a selective temperature controller and magnetic recording reproduction method including selective temperature control |
-
1991
- 1991-04-26 JP JP9754091A patent/JPH04325950A/en not_active Withdrawn
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6327227B1 (en) * | 1997-08-08 | 2001-12-04 | Sharp Kabushiki Kaisha | Magnetic recorder/reproduction apparatus including a selective temperature controller and magnetic recording reproduction method including selective temperature control |
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