JPH05303701A - Magnetic head for magneto-optical recording - Google Patents
Magnetic head for magneto-optical recordingInfo
- Publication number
- JPH05303701A JPH05303701A JP10681292A JP10681292A JPH05303701A JP H05303701 A JPH05303701 A JP H05303701A JP 10681292 A JP10681292 A JP 10681292A JP 10681292 A JP10681292 A JP 10681292A JP H05303701 A JPH05303701 A JP H05303701A
- Authority
- JP
- Japan
- Prior art keywords
- magneto
- magnetic pole
- main magnetic
- optical recording
- recording
- 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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Links
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- 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 which allows a recording signal to be overwritten by applying a modulation magnetic field to a magneto-optical recording medium.
【０００２】[0002]
【従来の技術】従来から、光磁気記録において、消去と
記録を同時に行うオーバライト（重ね書き）方式の１つ
として、図６にその原理を示すような磁界変調方式が知
られている。2. Description of the Related Art Conventionally, in magneto-optical recording, a magnetic field modulation method whose principle is shown in FIG. 6 is known as one of overwrite (overwrite) methods for simultaneously performing erasing and recording.
【０００３】すなわち、図６（ａ）に示すように、光磁
気ディスク５０の垂直磁化膜５０ｂに半導体レーザ５１
から照射された一定のレーザ光をレンズ５２を介して集
光させ、ディスク基板５０ａを経て前記垂直磁化膜５０
ｂの温度を、該磁化膜のキュリー点以上に上げておき、
磁気ヘッド５３による磁界を磁界変調回路５４を介して
記録信号に応じて変調し、前記磁化膜５０ｂ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。That is, as shown in FIG. 6A, the semiconductor laser 51 is formed on the perpendicular magnetization film 50b of the magneto-optical disk 50.
A fixed laser beam emitted from the laser beam is condensed through a lens 52, passes through a disk substrate 50a, and then the perpendicular magnetization film 50 is formed.
The temperature of b is raised above the Curie point of the magnetic film,
Information is recorded by modulating the magnetic field generated by the magnetic head 53 through the magnetic field modulation circuit 54 in accordance with a recording signal and leaving a magnetic pattern corresponding to the change in the magnetic field in the magnetizing film 50b.
【０００４】このような磁界変調方式で記録を行う場
合、垂直磁化膜５０ｂ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以上の大きな
磁界が必要である。しかも、光磁気記録の非接触記録の
利点を生かすためには、磁気ヘッド５３は光磁気ディス
ク５０より数百μｍ以上離す必要があり、そのためには
磁気ヘッド５３には数１０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 is performed by such a magnetic field modulation method, the magnetic field required to reverse the magnetization of the perpendicular magnetization film 50b depends on the film characteristics, but generally a large magnetic field of several hundred Oe or more is required. .. Moreover, in order to take advantage of the non-contact recording of the magneto-optical recording, the magnetic head 53 needs to be separated from the magneto-optical disk 50 by several hundreds of μm or more, and for this purpose, the magnetic head 53 has a large size of several tens of ampere turns or more. Magnetomotive force is required. Further, in order to perform high density recording, it is necessary to make the rise time of the magnetic field generated by the head sufficiently fast.
【０００５】このような磁界変調記録用の磁気ヘッド５
３は、光磁気ディスク５０に垂直に磁界を与える必要か
ら、図６（ｂ）に示すような形状の主磁極励磁型磁気ヘ
ッドが一般に用いられる。図６（ｂ）で、６０は一端を
光磁気ディスク５０に対向し、磁界を印加する主磁極で
あり、６１は主磁極に巻かれ、該主磁極を励磁するため
の巻数Ｎのコイルであり、６２は他端で主磁極と磁気的
に結合され、上記コイルを囲むように形成されたヨーク
部である。A magnetic head 5 for such magnetic field modulation recording
In No. 3, since it is necessary to apply a magnetic field perpendicularly to the magneto-optical disk 50, a main magnetic pole excitation type magnetic head having a shape as shown in FIG. 6B is generally used. In FIG. 6B, 60 is a main magnetic pole having one end facing the magneto-optical disk 50 and applying a magnetic field, and 61 is a coil wound around the main magnetic pole and having a winding number N for exciting the main magnetic pole. , 62 are yoke portions magnetically coupled to the main pole at the other end and formed so as to surround the coil.
【０００６】このコイル６１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５０に対向する
主磁極端からは記録信号に応じた磁界が発生し、光磁気
ディスク５０の垂直磁化膜を磁化することができる。When an exciting current I that changes according to a recording signal is passed through the coil 61, a magnetic field corresponding to the recording signal is generated from the main magnetic pole end facing the magneto-optical disk 50, and the perpendicular magnetization of the magneto-optical disk 50 is generated. The film can be magnetized.
【０００７】このような主磁極励磁型の磁気ヘッド５３
により、低消費電力で主磁極６０より高速に変化する磁
界を発生させるには、磁気ヘッド５３のインダクタンス
を小さくして、低電圧で大きな電流を流す必要がある。
磁気ヘッド５３のインダクタンスを低くするには、コイ
ル６１の巻き数を減らすか、主磁極６０の断面積を小さ
くするのが有効であるが、コイル６１の巻き数を減らす
と主磁極６０より発生する磁界も減少するので、主磁極
６０の断面積を小さくしたヘッドが一般に用いられてい
る。A magnetic head 53 of such a main magnetic pole excitation type.
Therefore, in order to generate a magnetic field that changes faster than the main magnetic pole 60 with low power consumption, it is necessary to reduce the inductance of the magnetic head 53 and flow a large current at a low voltage.
In order to reduce the inductance of the magnetic head 53, it is effective to reduce the number of turns of the coil 61 or reduce the cross-sectional area of the main magnetic pole 60. However, when the number of turns of the coil 61 is reduced, the coil 61 is generated from the main magnetic pole 60. Since the magnetic field also decreases, a head having a reduced cross-sectional area of the main pole 60 is generally used.
【０００８】従って、光磁気記録ディスクの最内周部か
ら最外周部まで記録するには、光ピックアップからのレ
ーザスポット位置と磁気ヘッドの主磁極の位置を合わせ
た状態で、磁気ヘッドも光ピックアップと同様に、光磁
気ディスクの直径方向に移動させる必要があった。Therefore, in order to record from the innermost peripheral portion to the outermost peripheral portion of the magneto-optical recording disk, the magnetic head is also picked up with the laser spot position from the optical pickup and the main magnetic pole of the magnetic head aligned. Similarly, it was necessary to move the magneto-optical disk in the diametrical direction.
【０００９】即ち、光ピックアップをディスク直径方向
に高速にアクセスして記録を行う場合には、磁気ヘッド
も高速にアクセスする必要があり、磁気ヘッドを移動の
ための機構及び動力装置が大型化したり、動力装置の消
費電力が増加する問題があった。That is, when the optical pickup is accessed at a high speed in the disk diameter direction for recording, the magnetic head also needs to be accessed at a high speed, and the mechanism and the power unit for moving the magnetic head are increased in size. However, there is a problem that the power consumption of the power unit increases.
【００１０】そこで、特開平１−９６８０４号公報で考
案されているような小さな単位磁気ヘッドを光磁気ディ
スクの直径方向に並べたアレー型磁気ヘッドが提案され
ている。Therefore, there has been proposed an array type magnetic head in which small unit magnetic heads are arranged in the diametrical direction of the magneto-optical disk as proposed in Japanese Patent Laid-Open No. 1-96804.
【００１１】図７（ａ）に示すように、このアレー型磁
気ヘッド７０は、光磁気ディスク５０の径方向に配設さ
れ、その断面は図７（ｂ）または（ｃ）に示すように、
円柱ないし角柱よりなる多数の単位電磁石棒７１により
構成されており、アレー型磁気ヘッド７０の側面図であ
る図７（ｄ）が示すように、単位電磁石棒７１は基端側
にコイル７２が巻かれている。各単位電磁石棒７１に巻
かれたコイル７２は、個々に独立に図示していないスイ
ッチ回路に接続されており、光ピックアップのポジショ
ン情報によりスイッチ回路を作動させることで選択さ
れ、ヘッド駆動回路と接続される。As shown in FIG. 7 (a), the array type magnetic head 70 is arranged in the radial direction of the magneto-optical disk 50, and its cross section is as shown in FIG. 7 (b) or (c).
The unit electromagnet rod 71 is composed of a large number of unit electromagnet rods 71 formed of a cylinder or a prism. As shown in FIG. 7D, which is a side view of the array type magnetic head 70, the unit electromagnet rod 71 has a coil 72 wound on the proximal end side. It has been. The coil 72 wound around each unit electromagnet rod 71 is individually and independently connected to a switch circuit (not shown), and is selected by operating the switch circuit according to the position information of the optical pickup and connected to the head drive circuit. To be done.
【００１２】このようなアレー型磁気ヘッド７０を用い
ることにより、磁気ヘッドを移動しないで固定ヘッドと
して使用することができるため、磁気ヘッドを移動する
ための駆動機構等が不要となり、アクセス時間の短縮
や、装置の小型化が容易になる。By using the array type magnetic head 70 as described above, the magnetic head can be used as a fixed head without moving, so that a drive mechanism for moving the magnetic head becomes unnecessary and access time is shortened. Also, it becomes easy to downsize the device.
【００１３】[0013]
【発明が解決しようとする課題】しかしながら、このよ
うなアレー型磁気ヘッド７０では、単位電磁石棒７１か
ら十分な磁界を効率的に得るためには、単位磁石棒７１
のインダクタンスを小さくする必要がある。However, in such an array type magnetic head 70, in order to efficiently obtain a sufficient magnetic field from the unit electromagnet rod 71, the unit magnet rod 71 is used.
It is necessary to reduce the inductance of.
【００１４】単位磁石のインダクタンスを小さくするに
は、例えば、単位磁石の磁極（媒体に対向する主磁極）
の断面積を小さくし、単位磁石の先端にコイルを巻き磁
路を短くし、磁路の磁気抵抗を減らす必要がある。To reduce the inductance of the unit magnet, for example, the magnetic pole of the unit magnet (main magnetic pole facing the medium)
It is necessary to reduce the cross-sectional area of, reduce the magnetic resistance of the magnetic path by winding a coil around the tip of the unit magnet to shorten the magnetic path.
【００１５】一方、単位磁石の磁極の断面積を小さくす
ると、ディスク直径方向の記録膜上のどの部分でも一定
強度の磁界を得るために、多くの単位電磁石棒をディス
クの直径方向に並べ、単位電磁石の先端部を密にしなけ
ればならない。しかし、上述したように、磁路を短くす
るために単位磁石の先端にコイルを巻くとすると、構造
上、単位電磁石の先端部を密に並べることができないと
いう問題がある。On the other hand, if the cross-sectional area of the magnetic poles of the unit magnets is reduced, many unit electromagnet rods are arranged in the diametrical direction of the disc in order to obtain a magnetic field of constant strength at any portion on the recording film in the disc diametrical direction. The tip of the electromagnet must be tight. However, as described above, if a coil is wound around the tip of the unit magnet in order to shorten the magnetic path, there is a problem in that the tip portions of the unit electromagnets cannot be densely arranged due to the structure.
【００１６】逆に、単位電磁石の先端部を密にするため
には、例えば図８に示すように、コイル８０を単位電磁
石８１の基端側に設ける必要があり、すなわち、コイル
位置を光磁気ディスク記録面に対向する単位電磁石先端
部より離して配置しなければならない。このように単位
電磁石先端からコイル位置が離れると、磁路が長くなり
磁路の磁気抵抗が増え、磁気ヘッドのコイル起磁力に対
する主磁極発生磁界、即ち、記録効率が低下するため、
コイルに大きな起磁力が必要となり、磁気ヘッド及びコ
イル駆動回路の損失が増加したり、磁気ヘッドのインダ
クタンスが増加して、高周波記録信号による高密度記録
が困難になる問題がある。On the contrary, in order to make the tip portion of the unit electromagnet dense, it is necessary to provide the coil 80 on the base end side of the unit electromagnet 81 as shown in FIG. It must be placed away from the tip of the unit electromagnet facing the recording surface of the disc. When the coil position is separated from the tip of the unit electromagnet in this way, the magnetic path becomes longer, the magnetic resistance of the magnetic path increases, and the magnetic field generated by the main magnetic pole against the coil magnetomotive force of the magnetic head, that is, the recording efficiency decreases,
There is a problem that a large magnetomotive force is required for the coil, the loss of the magnetic head and the coil drive circuit increases, and the inductance of the magnetic head increases, making it difficult to perform high-density recording with a high-frequency recording signal.
【００１７】さらに、磁気ヘッドを励磁する磁石励磁回
路からの高周波記録信号を高速に切り替えて各単位電磁
石に出力する高周波切り替え回路の数が多く必要とな
り、このような高周波切り替え回路は、高周波信号を切
り替えることから複雑な回路構成となり、コスト、回路
スペース、消費電力等が増加する問題もある。Further, a large number of high-frequency switching circuits for switching the high-frequency recording signal from the magnet exciting circuit for exciting the magnetic head at high speed and outputting it to each unit electromagnet are required. Since switching causes a complicated circuit configuration, there is also a problem that cost, circuit space, power consumption, and the like increase.
【００１８】本発明は、上記事情に鑑みてなされたもの
であり、磁気ヘッドの主磁極がディスク直径方向に長く
伸びて、直径方向にヘッドを移動する必要がない固定し
た光磁気記録用磁気ヘッドにおいて、インダクタンスが
小さく、また、記録効率が高く、高密度に記録できる光
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 circumstances, and the main magnetic pole of the magnetic head extends long in the disk diameter direction, and the fixed magnetic head for magneto-optical recording does not need to move the head in the diameter direction. In order to provide a magnetic head for magneto-optical recording, the inductance is small, the recording efficiency is high, and high density recording can be performed.
【００１９】[0019]
【課題を解決するための手段及び作用】本発明の光磁気
記録用磁気ヘッドは、情報を記録する光磁気記録媒体に
光ビームの照射と共に印加され、記録信号により変調さ
れる磁界を発生する光磁気記録用磁気ヘッドにおいて、
前記光磁気記録媒体の記録領域に沿って設けられ、前記
光磁気記録媒体に磁界を印加するための主磁極と、前記
主磁極を周回するように巻かれ、前記記録信号により変
調された電流を流すことにより該主磁極を励磁する第１
のコイルと、前記光磁気記録媒体の記録領域に対応して
設けられ、前記主磁極と磁気的に結合したヨーク部と、
前記ヨーク部に巻かれた複数の第２のコイルとを備え、
前記複数の第２のコイルのうち、前記光ビームの照射位
置に対応した第２のコイルは、前記主磁極の前記光ビー
ムの照射位置に応じた部分を磁気的に飽和しないように
磁化する直流電流で駆動し、残りの第２のコイルは、前
記主磁極のそれぞれ対応した部分を磁気的に飽和に近い
状態に磁化させる直流電流で駆動する。A magnetic head for magneto-optical recording according to the present invention is a light which is applied to a magneto-optical recording medium for recording information together with irradiation of a light beam to generate a magnetic field modulated by a recording signal. In the magnetic head for magnetic recording,
A main magnetic pole that is provided along the recording area of the magneto-optical recording medium and is used to apply a magnetic field to the magneto-optical recording medium, and a current that is wound around the main magnetic pole and that is modulated by the recording signal. A first magnetizing the main pole by flowing
A coil, and a yoke portion provided corresponding to the recording area of the magneto-optical recording medium and magnetically coupled to the main magnetic pole,
A plurality of second coils wound around the yoke portion,
The second coil corresponding to the irradiation position of the light beam of the plurality of second coils magnetizes a portion of the main pole corresponding to the irradiation position of the light beam so as not to be magnetically saturated. The remaining second coils are driven by an electric current, and are driven by a direct current that magnetizes the corresponding portions of the main magnetic poles to a state close to magnetic saturation.
【００２０】[0020]
【実施例】以下、図面を参照しながら本発明の実施例に
ついて述べる。Embodiments of the present invention will be described below with reference to the drawings.
【００２１】図１ないし図３は本発明の第１実施例に係
わり、図１は光磁気記録用磁気ヘッドの構成を説明する
説明図、図２は主磁極の磁化特性を説明するヒステリシ
ス特性図、図３は光磁気記録用磁気ヘッドの作用を説明
する説明図である。1 to 3 relate to the first embodiment of the present invention, FIG. 1 is an explanatory view for explaining the construction of a magnetic head for magneto-optical recording, and FIG. 2 is a hysteresis characteristic view for explaining the magnetization characteristics of the main magnetic pole. 3A and 3B are explanatory views for explaining the operation of the magnetic head for magneto-optical recording.
【００２２】光磁気記録用磁気ヘッドの斜視図である図
１（ａ）に示すように、光磁気記録用磁気ヘッド１は、
光磁気ディスクに対向してディスクの直径方向（図中で
はＡ−Ａ’軸方向）の記録領域を覆うように長く形成さ
れた主磁極２と、主磁極２と磁気的に結合したヨーク部
３と、主磁極２を励磁して光磁気ディスクの記録膜に記
録信号に応じて変化する磁界を印加するための第１コイ
ル４と、ヨーク部３に巻かれた複数の第２コイル５とで
構成されている。As shown in FIG. 1 (a), which is a perspective view of the magneto-optical recording magnetic head, the magneto-optical recording magnetic head 1 includes:
A main magnetic pole 2 formed to be long so as to face the magneto-optical disk so as to cover a recording area in the diametrical direction of the disk (the AA 'axis direction in the figure), and a yoke portion 3 magnetically coupled to the main magnetic pole 2. And a first coil 4 for exciting the main magnetic pole 2 to apply a magnetic field that changes according to a recording signal to the recording film of the magneto-optical disk, and a plurality of second coils 5 wound around the yoke portion 3. It is configured.
【００２３】前記主磁極２及びヨーク部３は、高周波励
磁において磁気特性の優れたフェライトやセンダスト合
金等の磁性材料で形成されており、光磁気ディスクの直
径方向にＮ分割されている（図１（ａ）ではＮ＝３）。
即ち、前記主磁極２及びヨーク部３は、図１（ａ）のＵ
n（n＝１〜３）で示す単位主磁極と単位ヨーク部を光磁
気ディスクの直径方向にＮ個一列に接合して構成されて
いる。The main magnetic pole 2 and the yoke portion 3 are made of a magnetic material such as ferrite or sendust alloy having excellent magnetic characteristics in high frequency excitation and are divided into N in the diameter direction of the magneto-optical disk (FIG. 1). In (a), N = 3).
That is, the main magnetic pole 2 and the yoke portion 3 are connected to the U of FIG.
A unit main magnetic pole and a unit yoke portion indicated by n (n = 1 to 3) are joined in N rows in a row in the diameter direction of the magneto-optical disk.
【００２４】尚、Ｎ分割された単位主磁極Ｕn間を磁気
シールドすることにより、単位主磁極からの漏れ磁束
が、隣接する単位主磁極に入り込むのを防止するように
しても良い。The magnetic flux may be shielded between the unit main magnetic poles Un divided into N to prevent the leakage magnetic flux from the unit main magnetic poles from entering the adjacent unit main magnetic poles.
【００２５】分割されたヨーク部３には、各々第２コイ
ル５がＮ個独立に巻かれており、第２コイルには直流電
流を流すことにより、図１（ａ）のＢ−Ｂ’断面図であ
る図１（ｂ）に示すように、実線ｂに示すような磁路に
従って一方向に磁束が発生して、分割されたヨーク部３
に対応する主磁極２を一方向に磁化する。N pieces of the second coil 5 are independently wound around each of the divided yoke portions 3, and by applying a direct current to the second coil, a cross section taken along the line BB 'of FIG. 1 (a). As shown in FIG. 1B, which is a diagram, a magnetic flux is generated in one direction along a magnetic path shown by a solid line b, and the divided yoke portion 3 is formed.
The main magnetic pole 2 corresponding to is magnetized in one direction.
【００２６】従って、第２コイル５の幾つかを選択し直
流電流を流すことによって、主磁極２が一方向に磁化さ
れる領域を選択するようになっている。すなわち、予
め、トラックアドレスと、そのアドレスに対応して選択
される単位単位主磁極Ｕnとの対応が決められており
（つまり、アドレス番号ＸＸＸＸのときはｉ番目の単位
主磁極Ｕiを選択する）、この対応関係はＲＯＭ等のテ
ーブルに書かれている。Therefore, by selecting some of the second coils 5 and passing a direct current, a region where the main magnetic pole 2 is magnetized in one direction is selected. That is, the correspondence between the track address and the unit main magnetic pole Un corresponding to the address is determined in advance (that is, when the address number is XXXX, the i-th unit main magnetic pole Ui is selected). , This correspondence is written in a table such as a ROM.
【００２７】記録時において、図示しないホストコント
ローラにより指示される記録しようとするトラックのト
ラックアドレスに対応した単位主磁極の番号Ｎをテーブ
ルより読みだして、Ｎ番目の単位主磁極ＵNを選択し、
このＮ番目の単位主磁極ＵNに巻かれた第２コイル５に
は電流を流さない、あるいは、少なくとも単位主磁極Ｕ
５を磁気的に飽和させない程度の直流電流を流し、それ
以外の単位主磁極に巻かれた第２コイル５には一方向に
磁気的に飽和に近いレベルまで磁化する直流電流を流す
ようになっている。At the time of recording, the number N of the unit main magnetic pole corresponding to the track address of the track to be recorded, which is designated by a host controller (not shown), is read from the table, and the Nth unit main magnetic pole UN is selected,
No current flows through the second coil 5 wound around the N-th unit main magnetic pole UN, or at least the unit main magnetic pole U
5, a DC current that does not magnetically saturate is supplied, and a DC current that magnetizes in one direction to a level close to magnetic saturation is supplied to the second coil 5 wound around the other unit main magnetic pole. ing.
【００２８】一方、第１コイル４は、主磁極２全体の回
りに巻かれており、第１コイル４に記録信号に応じて極
性の変化する高周波電流を流すと、図１（ｂ）の破線ａ
で示す磁路に従って磁束が発生し、主磁極２全体を磁化
しようとする。On the other hand, the first coil 4 is wound around the entire main magnetic pole 2, and when a high frequency current whose polarity changes according to a recording signal is passed through the first coil 4, the broken line in FIG. a
A magnetic flux is generated according to the magnetic path indicated by, and tries to magnetize the entire main magnetic pole 2.
【００２９】この時、第１コイル４及び第２コイル５に
より、主磁極２に印加される磁界Ｈに対して、主磁極２
の内部の磁束φの変化が図２に示すようなヒステリシス
特性であるとすれば、第１コイル４で印加する高周波磁
界の変化ΔＨ１に対する主磁極内の磁束変化量Δφは、
第２コイル５に直流電流を流すことにより印加される直
流磁界ＨＤＣの大きさにより変化する。At this time, the main magnetic pole 2 is applied to the magnetic field H applied to the main magnetic pole 2 by the first coil 4 and the second coil 5.
Assuming that the change in the magnetic flux φ inside the magnetic field has a hysteresis characteristic as shown in FIG. 2, the magnetic flux change amount Δφ in the main pole with respect to the change ΔH1 of the high frequency magnetic field applied by the first coil 4 is
It changes depending on the magnitude of the DC magnetic field HDC applied by applying a DC current to the second coil 5.
【００３０】例えば、ＨＤＣが０の時は、図２のΔφ1
のように磁束変化量は大きく、ＨＤＣを主磁極が飽和に
近い状態まで大きくした時は、図２のΔφ2のように磁
束変化量は小さい。For example, when HDC is 0, Δφ1 in FIG.
As described above, the amount of change in magnetic flux is large, and when the HDC is increased to a state where the main magnetic pole is close to saturation, the amount of change in magnetic flux is small like Δφ2 in FIG.
【００３１】このようにして本実施例では、第２コイル
５に流す直流電流の大きさにより、主磁極で発生する磁
束変化量を制御し、図１（ａ）で示す複数の単位主磁極
Ｕの第２コイル５を選択して高周波磁界を励磁すること
により、第１コイル４により主磁極２に発生する極性の
変化する磁界の大きさを光磁気ディスクの直径方向の位
置により変えることができるようになっている。In this way, in this embodiment, the amount of change in the magnetic flux generated in the main pole is controlled by the magnitude of the direct current flowing through the second coil 5, and the plurality of unit main poles U shown in FIG. By selecting the second coil 5 to excite a high frequency magnetic field, it is possible to change the magnitude of the magnetic field generated by the first coil 4 in the main magnetic pole 2 with changing polarity depending on the position in the diametrical direction of the magneto-optical disk. It is like this.
【００３２】次に、本実施例の光磁気記録用磁気ヘッド
の作用について説明する。Next, the operation of the magnetic head for magneto-optical recording of this embodiment will be described.
【００３３】図３は、例えば、光磁気ディスクの所定ト
ラックに書き込み磁界を印加する場合の本実施例の光磁
気記録用磁気ヘッド１の主磁極部分の光磁気ディスク直
径方向の断面図を示したもので、分割数Ｎ＝９の場合で
ある。主磁極部の下には、光磁気ディスク１１を介して
光ピックアップ１２が対向して設置されており、光磁気
ディスク１１の直径方向にアクセス可能となっている。
ここで主磁極２部分の単位主磁極Ｕ１〜Ｕ９は、光磁気
ディスク１１の内周から外周に渡る記録領域（記録トラ
ック）Ｗをカバーするように配置されている。FIG. 3 shows a cross-sectional view of the main magnetic pole portion of the magnetic head 1 for magneto-optical recording of the present embodiment when the write magnetic field is applied to a predetermined track of the magneto-optical disk in the diameter direction of the magneto-optical disk. This is the case where the number of divisions N = 9. An optical pickup 12 is installed below the main magnetic pole portion so as to face the magneto-optical disk 11, and is accessible in the diameter direction of the magneto-optical disk 11.
Here, the unit main magnetic poles U1 to U9 in the main magnetic pole 2 portion are arranged so as to cover a recording area (recording track) W extending from the inner circumference to the outer circumference of the magneto-optical disk 11.
【００３４】まず、図３（ａ）に示すように、光磁気デ
ィスク１１の中周付近の所定トラックに書き込みを行う
場合、光ピックアップ１２はディスク１１のトラック番
地情報をもとに、記録すべき所定のトラックに移動して
光磁気ディスク１１の記録膜を一定のレーザ光で照射す
る。First, as shown in FIG. 3A, when writing is performed on a predetermined track near the middle circumference of the magneto-optical disk 11, the optical pickup 12 should record based on the track address information of the disk 11. After moving to a predetermined track, the recording film of the magneto-optical disk 11 is irradiated with a constant laser beam.
【００３５】この時、所定のトラック位置に最も近い例
えば単位主磁極Ｕ５を除く単位主磁極８個に対応するヨ
ーク部３の第２コイル５に、直流電流が流され、図３
（ａ）に示すように、主磁極２の単位主磁極Ｕ５を除く
単位主磁極８個に対応する部分を、一方向に磁気的に飽
和に近いレベルまで磁化する。また、所定のトラック位
置に最も近い単位主磁極Ｕ５に対応するヨーク部３の第
２コイル５には電流を流さない、あるいは、少なくとも
単位主磁極Ｕ５を磁気的に飽和させない程度の直流電流
を流す。At this time, a direct current is caused to flow through the second coil 5 of the yoke portion 3 corresponding to the eight unit main magnetic poles except the unit main magnetic pole U5 which is the closest to the predetermined track position.
As shown in (a), the portions of the main magnetic pole 2 corresponding to the eight unit main magnetic poles excluding the unit main magnetic pole U5 are magnetized in one direction to a level close to magnetic saturation. Further, no current flows through the second coil 5 of the yoke portion 3 corresponding to the unit main magnetic pole U5 closest to the predetermined track position, or at least a direct current that does not magnetically saturate the unit main magnetic pole U5 flows. ..
【００３６】一方、単位主磁極の集合である主磁極２の
全体には、第１コイル４より記録信号により極性の反転
する磁界が印加されるが、Ｕ５を除く他の単位主磁極は
直流バイアス磁界が印加されているため、磁束の変化量
は小さく、直流バイアス磁界の印加されていない単位主
磁極Ｕ５のみが、第１コイル４の磁界に反応して磁束が
大きく変化する。従って、Ｕ５を除く単位主磁極の下に
ある光磁気ディスク１１の記録膜面上では、記録信号で
変化する磁界は小さく、一方向の直流磁界（例えば消去
方向の磁界）が印加され、記録膜を十分に磁化反転する
だけの磁界は得られない。On the other hand, a magnetic field whose polarity is inverted by the recording signal is applied from the first coil 4 to the entire main magnetic pole 2 which is a set of unit main magnetic poles, but a DC bias is applied to the other main magnetic poles except U5. Since the magnetic field is applied, the amount of change in the magnetic flux is small, and only the unit main magnetic pole U5 to which the DC bias magnetic field is not applied responds to the magnetic field of the first coil 4 to greatly change the magnetic flux. Therefore, on the recording film surface of the magneto-optical disk 11 below the unit main pole except U5, the magnetic field that changes with the recording signal is small, and a DC magnetic field in one direction (for example, a magnetic field in the erasing direction) is applied to the recording film. It is not possible to obtain a magnetic field that sufficiently reverses the magnetization.
【００３７】また、Ｕ５の下の記録すべき所定のトラッ
ク付近には、記録膜を充分に反転できる大きさの記録信
号に応じて極性の反転する磁界が印加され、光ピックア
ップ１２よりレーザが照射される、記録すべき所定のト
ラックに磁界変調記録が行われる。In the vicinity of a predetermined track to be recorded under U5, a magnetic field whose polarity is inverted in accordance with a recording signal of a magnitude sufficient to invert the recording film is applied, and the laser is irradiated from the optical pickup 12. The magnetic field modulation recording is performed on a predetermined track to be recorded.
【００３８】同様にして、ディスク１１の外周部に記録
を行う場合も、図３（ｂ）で示すように記録すべきトラ
ックの位置に応じて、単位主磁極を選択して直流バイア
ス磁界を印加することにより、主磁極の記録トラック付
近に対応する部分（図ではＵ８）のみで記録反転磁界を
発生できる。Similarly, when recording on the outer peripheral portion of the disk 11, a unit main magnetic pole is selected and a DC bias magnetic field is applied according to the position of the track to be recorded as shown in FIG. 3B. By doing so, the recording reversal magnetic field can be generated only in the portion (U8 in the figure) corresponding to the vicinity of the recording track of the main magnetic pole.
【００３９】また、図３（ｃ）で示すように、記録すべ
きトラック位置が単位主磁極の境界部分に相当する時
は、境界部両側の２つの単位主磁極（図ではＵ３及びＵ
４）を除く単位主磁極に直流バイアス磁界を印加すれ
ば、境界部でも均一の反転磁界が得られる。Further, as shown in FIG. 3C, when the track position to be recorded corresponds to the boundary portion of the unit main magnetic poles, two unit main magnetic poles on both sides of the boundary portion (U3 and U in the figure).
If a DC bias magnetic field is applied to the unit main magnetic poles other than 4), a uniform reversal magnetic field can be obtained even at the boundary.
【００４０】以上のように、本実施例の光磁気記録用磁
気ヘッド１を用いれば、光磁気ディスクの任意のトラッ
クに最も近い単位主磁極Ｕnを選んで、記録磁界を印加
することが可能で、光磁気記録用磁気ヘッド１を光ピッ
クアップと同様に光磁気ディスク直径方向に移動させる
必要がなく、従って光磁気記録用磁気ヘッド１を駆動す
る駆動機構及び駆動制御手段を必要とせず、簡単な構成
により光磁気記録を行うことができる。As described above, by using the magneto-optical recording magnetic head 1 of this embodiment, it is possible to apply the recording magnetic field by selecting the unit main magnetic pole Un closest to an arbitrary track of the magneto-optical disk. As with the optical pickup, it is not necessary to move the magneto-optical recording magnetic head 1 in the diameter direction of the magneto-optical disk, and thus a drive mechanism and drive control means for driving the magneto-optical recording magnetic head 1 are not required, which is simple. Magneto-optical recording can be performed depending on the configuration.
【００４１】しかも、光磁気記録用磁気ヘッド１は、光
磁気ディスクに対向し接近して配置される主磁極２全体
に密着して該主磁極２励磁用の第１コイル４を巻くこと
が可能となるので、主磁極２の磁路を短くでき、ヘッド
の記録効率を上げることが容易に実現できる。Moreover, the magnetic head 1 for magneto-optical recording can be wound in close contact with the entire main magnetic pole 2 which is arranged facing and close to the magneto-optical disk, and the first coil 4 for exciting the main magnetic pole 2 is wound. Therefore, the magnetic path of the main pole 2 can be shortened, and the recording efficiency of the head can be easily increased.
【００４２】また、記録に寄与する単位主磁極Ｕn以外
の大部分の主磁極２は、直流バイアス磁界が印加されて
磁束の変化は小さいので、主磁極２全体に巻かれた第１
コイル４のインダクタンスは、コイル内に記録に寄与す
る単位主磁極Ｕnのみが存在している場合とほぼ等価の
状態となり、主磁極２全体を励磁する場合より小さな値
となる。つまり、インダクタンスはコイルに囲まれる主
磁極の断面積に比例するので、分割数Ｎの磁気ヘッドで
１個の単位主磁極でのみ磁界反転する場合、インダクタ
ンスは主磁極２全体を励磁する場合の１／Ｎ程度にな
り、高周波励磁でのヘッドインピーダンスを小さくし
て、高密度記録が可能となる。Further, since most of the main magnetic poles 2 other than the unit main magnetic pole Un that contribute to recording have a small change in the magnetic flux due to the application of the DC bias magnetic field, the first main magnetic pole 2 is wound around the entire main magnetic pole 2.
The inductance of the coil 4 is almost equivalent to the case where only the unit main magnetic pole Un that contributes to recording exists in the coil, and has a smaller value than when the entire main magnetic pole 2 is excited. That is, since the inductance is proportional to the cross-sectional area of the main magnetic pole surrounded by the coil, when the magnetic field is reversed by only one unit main magnetic pole in the magnetic head having the division number N, the inductance is 1 when the main magnetic pole 2 is excited as a whole. / N, the head impedance under high frequency excitation is reduced, and high density recording becomes possible.
【００４３】さらに、第２コイル５に流れる電流は、直
流電流であり、記録に寄与する単位主磁極を選択する場
合の第２コイル５に流す電流の制御は、従来の高周波信
号の切り替え手段に比べ、簡単な切り替えスイッチ等で
構成で実現できる。Further, the current flowing through the second coil 5 is a direct current, and the current flowing through the second coil 5 when the unit main magnetic pole contributing to recording is selected is controlled by the conventional high frequency signal switching means. In comparison, it can be realized by a configuration with a simple changeover switch.
【００４４】尚、光磁気記録用磁気ヘッドの分割数Ｎ
は、上述したように、記録時の光磁気記録用磁気ヘッド
の高周波励磁でのヘッドインピーダンスを小さくするた
めに、製造効率等を考慮した上で、十分大きくすること
が望ましい。The division number N of the magnetic head for magneto-optical recording
As described above, in order to reduce the head impedance during high frequency excitation of the magnetic head for magneto-optical recording during recording, it is desirable to sufficiently increase it in consideration of manufacturing efficiency and the like.
【００４５】また、主磁極２及びヨーク部３は、光磁気
ディスクの直径方向にＮ分割されているとしたが、これ
に限らず、主磁極２及びヨーク部３を一体構造とし、ヨ
ーク部３に第２コイルを巻くためのコイル巻付部をＮ個
設けることにより、選択的に主磁極２に直流バイアス磁
界を印加するようにしても良い。The main magnetic pole 2 and the yoke portion 3 are divided into N in the diametrical direction of the magneto-optical disk. However, the present invention is not limited to this, and the main magnetic pole 2 and the yoke portion 3 have an integrated structure. Alternatively, a DC bias magnetic field may be selectively applied to the main magnetic pole 2 by providing N coil winding portions for winding the second coil.
【００４６】次に本発明の第２実施例の光磁気記録用磁
気ヘッドを説明する。Next explained is a magnetic head for magneto-optical recording according to the second embodiment of the invention.
【００４７】図４は第２実施例に係る光磁気記録用磁気
ヘッドの構成を説明する説明図である。FIG. 4 is an explanatory view for explaining the structure of the magneto-optical recording magnetic head according to the second embodiment.
【００４８】第２実施例の光磁気記録用磁気ヘッドの斜
視図である図４（ａ）に示すように、第２実施例の光磁
気記録用磁気ヘッド１ａは、基本的には第１実施例と同
じであるが、ヨーク部３が延びて、主磁極２とギャップ
２１を形成し、ヨーク部３に巻かれた第２コイル５が主
磁極２の直下ではなく、主磁極２の第１コイル４より空
間的に離れた位置に設置されている点が、第１実施例と
は異なる。As shown in FIG. 4A, which is a perspective view of the magneto-optical recording magnetic head of the second embodiment, the magneto-optical recording magnetic head 1a of the second embodiment is basically the first embodiment. Same as the example, but the yoke portion 3 extends to form the gap 21 with the main magnetic pole 2, and the second coil 5 wound around the yoke portion 3 is not directly below the main magnetic pole 2 but the first magnetic pole 2 of the main magnetic pole 2. It is different from the first embodiment in that it is installed at a position spatially separated from the coil 4.
【００４９】すなわち、本実施例においては、ヨーク部
３は主磁極２と主磁極部２の下端で磁気的に結合し、主
磁極上端でも空隙（ギャップ）２１を介して磁気的に結
合しているため、第１実施例のような主磁極２下端のみ
で磁気的に結合する場合に比べ、ヨーク部３の主磁極２
に対する磁気的結合は強い。従って、主磁極２に結合す
るヨーク部３の第２コイル５から見た磁気抵抗は減少す
るため、ヨーク部３に巻かれた第２コイル５の起磁力が
小さくても主磁極２を十分に飽和に近い状態まで磁化で
きる。That is, in this embodiment, the yoke portion 3 is magnetically coupled to the main magnetic pole 2 at the lower end of the main magnetic pole portion 2, and magnetically coupled to the upper end of the main magnetic pole via the gap 21. Therefore, as compared with the case of magnetically coupling only at the lower end of the main magnetic pole 2 as in the first embodiment, the main magnetic pole 2 of the yoke portion 3 is
The magnetic coupling to is strong. Therefore, since the magnetic resistance seen from the second coil 5 of the yoke portion 3 coupled to the main magnetic pole 2 is reduced, the main magnetic pole 2 can be sufficiently moved even if the magnetomotive force of the second coil 5 wound around the yoke portion 3 is small. Can magnetize up to near saturation.
【００５０】図４（ａ）のＣ−Ｃ’線断面図である図４
（ｂ）に示すように、ヨーク部３と主磁極２とのギャッ
プ２１の間隔ＧＰは、小さくすると第２コイル５から見
たヨーク部３の磁気抵抗が減少して、第２コイル５での
起磁力をより小さくできるが、主磁極端と光磁気ディス
クの間隔より小さくすると、第１コイル４による主磁極
２からの発生磁束がヨーク部３に入り易くなり、ヘッド
の記録効率が低下するため、主磁極端と光磁気ディスク
間距離より大きな最適値に設定してある。FIG. 4 is a sectional view taken along the line CC ′ of FIG.
As shown in (b), when the gap GP of the gap 21 between the yoke portion 3 and the main magnetic pole 2 is reduced, the magnetic resistance of the yoke portion 3 viewed from the second coil 5 decreases, and the second coil 5 has a smaller magnetic resistance. The magnetomotive force can be made smaller, but if it is made smaller than the distance between the main magnetic pole end and the magneto-optical disk, the magnetic flux generated from the main magnetic pole 2 by the first coil 4 will easily enter the yoke portion 3, and the recording efficiency of the head will be reduced. The optimum value is set to be larger than the distance between the main magnetic pole end and the magneto-optical disk.
【００５１】その他の構成、作用は第１実施例と同じで
ある。Other configurations and operations are the same as those in the first embodiment.
【００５２】従って、本第２実施例の光磁気記録用磁気
ヘッド１ａは、第１実施例の効果に加え、第１実施例と
同一巻き数の第２コイル５を用いた場合には、第２コイ
ル５に流す直流電流を減らすことが可能で、ヘッドコイ
ル駆動の消費電力を減らすことができる。Therefore, in the magnetic head 1a for magneto-optical recording of the second embodiment, in addition to the effect of the first embodiment, when the second coil 5 having the same number of turns as in the first embodiment is used, It is possible to reduce the direct current flowing through the two coils 5 and reduce the power consumption for driving the head coil.
【００５３】また、主磁極２とヨーク部３との磁気的な
結合が強くなるので、第２コイル５をヨーク部３の主磁
極２から距離の離れた場所に設置することが可能とな
り、第２コイル５を、図４（ｂ）で示すように、第１コ
イル４から離れた水平面に置くことも可能で、第１コイ
ル４と第２コイル５の電気的、熱的干渉を小さくして、
第２コイル５の直流励磁回路に、第１コイル４の高周波
信号ノイズが漏れ込むのを防止して、直流励磁回路の誤
動作を無くしたり、高周波励磁に伴う主磁極２及び第１
コイル４の発熱が第２コイル５に伝わり難くして、第２
コイル５の熱的な劣化を防止できる。Further, since the magnetic coupling between the main magnetic pole 2 and the yoke portion 3 becomes strong, it becomes possible to install the second coil 5 at a position away from the main magnetic pole 2 of the yoke portion 3, It is also possible to place the two coils 5 on a horizontal plane apart from the first coil 4 as shown in FIG. 4 (b), thereby reducing the electrical and thermal interference between the first coil 4 and the second coil 5. ,
The high frequency signal noise of the first coil 4 is prevented from leaking into the direct current excitation circuit of the second coil 5 to eliminate malfunction of the direct current excitation circuit, and the main magnetic pole 2 and the first magnetic pole accompanying the high frequency excitation.
The heat of the coil 4 is less likely to be transmitted to the second coil 5,
The thermal deterioration of the coil 5 can be prevented.
【００５４】さらに、光磁気記録用磁気ヘッド１ａ全体
を偏平構造にすることも可能で、形状設計の自由度も上
がる。Furthermore, the entire magneto-optical recording magnetic head 1a can be made to have a flat structure, and the degree of freedom in shape design is increased.
【００５５】次に本発明の第３実施例の光磁気記録用磁
気ヘッドを説明する。Next explained is a magnetic head for magneto-optical recording according to the third embodiment of the invention.
【００５６】図５は第３実施例に係る光磁気記録用磁気
ヘッドの構成を説明する説明図である。FIG. 5 is an explanatory view for explaining the structure of the magneto-optical recording magnetic head according to the third embodiment.
【００５７】図５に示すように、第３実施例の光磁気記
録用磁気ヘッド１ｂは、基本的には第２実施例と同じ構
造をしているが、主磁極が磁性金属材料からなる薄膜や
薄体で形成されている点が第２実施例と異なる。As shown in FIG. 5, the magnetic head 1b for magneto-optical recording of the third embodiment has basically the same structure as that of the second embodiment, but the main pole is a thin film made of a magnetic metal material. It is different from the second embodiment in that it is formed of a thin body.
【００５８】すなわち、光磁気記録用磁気ヘッドの上面
図である図５（ａ）において、主磁極２は、高周波励磁
で磁気特性の優れた、アモルファス合金やセンダスト合
金等からなる磁性金属の薄膜やリボン状の薄体の２ａ
と、ＳｉＯ2等の非磁性の材料２ｂからなる、積層構造
をとっている。ここで、非磁性材料としては、薄体磁性
材料をラミネートする際の接着剤でも構わない。また、
ヨーク部３は、主磁極体積が大きくても低コストのフェ
ライト材で構成している。That is, in FIG. 5A, which is a top view of the magneto-optical recording magnetic head, the main magnetic pole 2 is a thin film of a magnetic metal made of an amorphous alloy, a sendust alloy, or the like, which has excellent magnetic characteristics by high-frequency excitation. Ribbon-shaped thin body 2a
And a non-magnetic material 2b such as SiO2 has a laminated structure. Here, the non-magnetic material may be an adhesive for laminating the thin magnetic material. Also,
The yoke portion 3 is made of a low-cost ferrite material even if the main magnetic pole volume is large.
【００５９】このように、主磁極２を薄い磁性材料２ａ
及び薄い磁性材料と非磁性材料２ｂの積層体とすること
で、高周波励磁での主磁極磁性材料で発生する渦電流損
失を減らして、磁界の発生効率を向上できるようになっ
ている。As described above, the main magnetic pole 2 is made of the thin magnetic material 2a.
By using a laminated body of a thin magnetic material and a non-magnetic material 2b, it is possible to reduce the eddy current loss generated in the magnetic material of the main pole during high frequency excitation and improve the efficiency of magnetic field generation.
【００６０】その他の構成、作用は第２実施例と同じで
ある。Other configurations and operations are the same as those in the second embodiment.
【００６１】従って、本第３実施例の光磁気記録用磁気
ヘッド１ｂは、第２実施例の効果に加え、高密度記録時
で低損失の磁気ヘッドを実現できる上、図５（ａ）のＤ
−Ｄ’線断面図である図５（ｂ）に示すように、主磁極
２面積を減らして、第１コイル４のインダクタンスを小
さくすることにより、第１コイル駆動回路の消費電力も
低減できる。Therefore, in addition to the effect of the second embodiment, the magnetic head 1b for magneto-optical recording of the third embodiment can realize a low loss magnetic head at the time of high density recording. D
As shown in FIG. 5B, which is a cross-sectional view taken along the line D ', the power consumption of the first coil drive circuit can be reduced by reducing the area of the main pole 2 and the inductance of the first coil 4.
【００６２】[0062]
【発明の効果】以上説明したように本発明によれば、本
発明の光磁気記録用磁気ヘッドは、磁気ヘッドの主磁極
がディスク直径方向に長く伸びて、直径方向にヘッドを
移動する必要がなく、また、インダクタンスが小さく、
記録効率が高いので、高密度に記録ができるという効果
がある。As described above, according to the present invention, in the magneto-optical recording magnetic head of the present invention, it is necessary that the main magnetic pole of the magnetic head extends in the diameter direction of the disk and moves the head in the diameter direction. And the inductance is small,
Since the recording efficiency is high, there is an effect that high density recording can be performed.
【図１】 第１実施例に係る光磁気記録用磁気ヘッドの
構成を説明する説明図である。FIG. 1 is an explanatory diagram illustrating a configuration of a magnetic head for magneto-optical recording according to a first embodiment.
【図２】 第１実施例に係る主磁極の磁化特性を説明す
るヒステリシス特性図である。FIG. 2 is a hysteresis characteristic diagram illustrating the magnetization characteristic of the main pole according to the first example.
【図３】 第１実施例に係る光磁気記録用磁気ヘッドの
作用を説明する説明図である。FIG. 3 is an explanatory diagram illustrating an operation of the magneto-optical recording magnetic head according to the first embodiment.
【図４】 第２実施例に係る光磁気記録用磁気ヘッドの
構成を説明する説明図である。FIG. 4 is an explanatory diagram illustrating a configuration of a magnetic head for magneto-optical recording according to a second embodiment.
【図５】 第３実施例に係る光磁気記録用磁気ヘッドの
構成を説明する説明図である。FIG. 5 is an explanatory diagram illustrating a configuration of a magneto-optical recording magnetic head according to a third embodiment.
【図６】 従来例に係る光磁気記録用磁気ヘッドを説明
する説明図である。FIG. 6 is an explanatory diagram illustrating a conventional magnetic head for magneto-optical recording.
【図７】 従来例に係るアレー型光磁気記録用磁気ヘッ
ドを説明する説明図である。FIG. 7 is an explanatory diagram illustrating an array type magneto-optical recording magnetic head according to a conventional example.
【図８】 従来例に係る図７のアレー型光磁気記録用磁
気ヘッドの具体例を示す断面図である。FIG. 8 is a cross-sectional view showing a specific example of the array-type magneto-optical recording magnetic head of FIG. 7 according to a conventional example.
１…光磁気記録用磁気ヘッド ２…主磁極 ３…ヨーク部 ４…第１コイル ５…第２コイル DESCRIPTION OF SYMBOLS 1 ... Magnetic head for magneto-optical recording 2 ... Main magnetic pole 3 ... Yoke part 4 ... 1st coil 5 ... 2nd coil
Claims (3)
ムの照射と共に印加され、記録信号により変調される磁
界を発生する光磁気記録用磁気ヘッドにおいて、 前記光磁気記録媒体の記録領域に沿って設けられ、前記
光磁気記録媒体に磁界を印加するための主磁極と、 前記主磁極を周回するように巻かれ、前記記録信号によ
り変調された電流を流すことにより該主磁極を励磁する
第１のコイルと、 前記光磁気記録媒体の記録領域に対応して設けられ、前
記主磁極と磁気的に結合したヨーク部と、 前記ヨーク部に巻かれた複数の第２のコイルとを備え、 前記複数の第２のコイルのうち、前記光ビームの照射位
置に対応した第２のコイルは、前記主磁極の前記光ビー
ムの照射位置に応じた部分を磁気的に飽和しないように
磁化する直流電流で駆動し、残りの第２のコイルは、前
記主磁極のそれぞれ対応した部分を磁気的に飽和に近い
状態に磁化させる直流電流で駆動するようにしたことを
特徴とする光磁気記録用磁気ヘッド。1. A magnetic head for magneto-optical recording, which is applied to a magneto-optical recording medium for recording information with irradiation of a light beam and generates a magnetic field modulated by a recording signal, wherein the recording area of the magneto-optical recording medium is A main magnetic pole for applying a magnetic field to the magneto-optical recording medium, and a main magnetic pole wound around the main magnetic pole so as to excite the main magnetic pole by causing a current modulated by the recording signal to flow. 1 coil, a yoke portion provided corresponding to the recording area of the magneto-optical recording medium and magnetically coupled to the main magnetic pole, and a plurality of second coils wound around the yoke portion, The second coil corresponding to the irradiation position of the light beam of the plurality of second coils magnetizes a portion of the main pole corresponding to the irradiation position of the light beam so as not to be magnetically saturated. Driven by electric current And, the remaining of the second coil, a magneto-optical recording magnetic head is characterized in that so as to drive a DC current for magnetizing the corresponding portions of the main magnetic pole in a state close to magnetically saturate.
ムの照射と共に印加され、記録信号により変調される磁
界を発生する光磁気記録用磁気ヘッドにおいて、 前記光磁気記録媒体の記録領域に沿って設けられ、前記
光磁気記録媒体に磁界を印加するための主磁極と、 前記主磁極を周回するように巻かれ、前記記録信号によ
り変調された電流を流すことにより該主磁極を励磁する
第１のコイルと、 前記光磁気記録媒体の記録領域に対応して設けられ、前
記主磁極と磁気的に結合したヨーク部と、 前記ヨーク部に巻かれた複数の第２のコイルとを備え、 前記複数の第２のコイルのうち、前記光ビームの照射位
置に対応した第２のコイルは、直流電流を流さず、残り
の第２のコイルは、前記主磁極のそれぞれ対応した部分
を磁気的に飽和に近い状態に磁化させる直流電流で駆動
するようにしたことを特徴とする光磁気記録用磁気ヘッ
ド。2. A magneto-optical recording magnetic head which is applied to a magneto-optical recording medium for recording information with irradiation of a light beam to generate a magnetic field which is modulated by a recording signal, along a recording area of the magneto-optical recording medium. A main magnetic pole for applying a magnetic field to the magneto-optical recording medium, and a main magnetic pole wound around the main magnetic pole so as to excite the main magnetic pole by causing a current modulated by the recording signal to flow. 1 coil, a yoke portion provided corresponding to the recording area of the magneto-optical recording medium and magnetically coupled to the main magnetic pole, and a plurality of second coils wound around the yoke portion, Of the plurality of second coils, the second coil corresponding to the irradiation position of the light beam does not flow a direct current, and the remaining second coils magnetically correspond to respective portions of the main magnetic pole. Close to saturation A magnetic head being characterized in that so as to drive a DC current to magnetize the state.
と非磁性の薄体の積層体で構成されていることを特徴と
する請求項１または請求項２に記載の光磁気記録用磁気
ヘッド。3. The magneto-optical recording according to claim 1, wherein the main magnetic pole is composed of a magnetic thin body or a laminated body of a magnetic thin body and a non-magnetic thin body. Magnetic head.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10681292A JPH05303701A (en) | 1992-04-24 | 1992-04-24 | Magnetic head for magneto-optical recording |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10681292A JPH05303701A (en) | 1992-04-24 | 1992-04-24 | Magnetic head for magneto-optical recording |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05303701A true JPH05303701A (en) | 1993-11-16 |
Family
ID=14443254
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10681292A Withdrawn JPH05303701A (en) | 1992-04-24 | 1992-04-24 | Magnetic head for magneto-optical recording |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05303701A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0736866A2 (en) * | 1995-04-07 | 1996-10-09 | Discovision Associates | Bias coil for magneto-optical drive |
| KR100733641B1 (en) * | 2000-08-03 | 2007-07-02 | 쓰리엠 이노베이티브 프로퍼티즈 캄파니 | Apparatus and method for breathing apparatus component coupling |
-
1992
- 1992-04-24 JP JP10681292A patent/JPH05303701A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0736866A2 (en) * | 1995-04-07 | 1996-10-09 | Discovision Associates | Bias coil for magneto-optical drive |
| EP0736866A3 (en) * | 1995-04-07 | 1997-12-17 | Discovision Associates | Bias coil for magneto-optical drive |
| KR100733641B1 (en) * | 2000-08-03 | 2007-07-02 | 쓰리엠 이노베이티브 프로퍼티즈 캄파니 | Apparatus and method for breathing apparatus component coupling |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
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