JPS63211101A - Magnetic head - Google Patents
Magnetic headInfo
- Publication number
- JPS63211101A JPS63211101A JP4385387A JP4385387A JPS63211101A JP S63211101 A JPS63211101 A JP S63211101A JP 4385387 A JP4385387 A JP 4385387A JP 4385387 A JP4385387 A JP 4385387A JP S63211101 A JPS63211101 A JP S63211101A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- core
- films
- magnetic head
- soft
- 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.)
- Pending
Links
- 230000004907 flux Effects 0.000 claims abstract description 29
- 229910000889 permalloy Inorganic materials 0.000 claims abstract description 6
- 229910000702 sendust Inorganic materials 0.000 claims abstract description 6
- 229910000808 amorphous metal alloy Inorganic materials 0.000 claims abstract description 5
- 238000010030 laminating Methods 0.000 claims abstract description 4
- 230000003287 optical effect Effects 0.000 claims description 9
- 229910000859 α-Fe Inorganic materials 0.000 claims description 5
- 239000007769 metal material Substances 0.000 claims description 4
- 239000011810 insulating material Substances 0.000 claims description 2
- 239000000696 magnetic material Substances 0.000 abstract description 9
- 230000005415 magnetization Effects 0.000 abstract description 6
- 239000012212 insulator Substances 0.000 abstract description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract 1
- 229910052681 coesite Inorganic materials 0.000 abstract 1
- 229910052593 corundum Inorganic materials 0.000 abstract 1
- 229910052906 cristobalite Inorganic materials 0.000 abstract 1
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 239000000377 silicon dioxide Substances 0.000 abstract 1
- 235000012239 silicon dioxide Nutrition 0.000 abstract 1
- 229910052682 stishovite Inorganic materials 0.000 abstract 1
- 229910052905 tridymite Inorganic materials 0.000 abstract 1
- 229910001845 yogo sapphire Inorganic materials 0.000 abstract 1
- 239000011162 core material Substances 0.000 description 36
- 239000010408 film Substances 0.000 description 18
- 238000000034 method Methods 0.000 description 15
- 239000010409 thin film Substances 0.000 description 8
- 239000000463 material Substances 0.000 description 3
- 229920006395 saturated elastomer Polymers 0.000 description 3
- 239000000956 alloy Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000002500 effect on skin Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000004397 blinking Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
Landscapes
- Recording Or Reproducing By Magnetic Means (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
この発明は、磁界変調方式により情報信号を光磁気記録
する際に用いられる磁界変調用磁気ヘッドの改良構造に
関する。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to an improved structure of a magnetic head for magnetic field modulation used when magneto-optically recording information signals using a magnetic field modulation method.
従来の技術
消去・書き換え可能な光ディスクとして光磁気ディスク
がある。この光磁気ディスクへの情報の記録方式には大
別して２通りある。１つは光変調方式であり、他の１つ
は磁界変調方式である。光変調方式は、記録したい方向
に直流磁界を５えておき、記録信号で媒体に照射するレ
ーザ光を変調し、光の点滅に変換して記録するものであ
る。一方、磁界変調方式は、レーザ光は常に連続照射し
ておき、記録信号で媒体に印加する磁界を変調し、その
方向を信号に応じて反転させて磁化を形成するものであ
る。一般には前者の方が開発の主流になっていた。2. Description of the Related Art Magneto-optical disks are known as erasable and rewritable optical disks. There are roughly two types of methods for recording information on this magneto-optical disk. One is an optical modulation method, and the other is a magnetic field modulation method. In the optical modulation method, a direct current magnetic field is set in the direction of recording, and the laser light irradiated onto the medium is modulated with a recording signal, converting it into blinking light for recording. On the other hand, in the magnetic field modulation method, laser light is constantly irradiated, the magnetic field applied to the medium is modulated by a recording signal, and its direction is reversed according to the signal to form magnetization. In general, the former was the mainstream of development.
光変調方式では、消去時には、記録媒体のトラ７りに直
流レーザ光を照射しつつ反磁界を与えることによって消
去動作が行われる。これは、再占き込み動作を行う前に
記録トラックを一度消去しておく方法である。この光変
調方式では、新しい情報を記録する際に記録トラックに
書き込まれた古い情報を予め消去モードで消去しなけれ
ばならず、いわゆるオーバーライドといわれる重ね書き
ができない。In the optical modulation method, during erasing, the erasing operation is performed by applying a demagnetizing field while irradiating the track 7 of the recording medium with a DC laser beam. This is a method of erasing the recording track once before performing the re-interfering operation. In this optical modulation method, when recording new information, old information written on a recording track must be erased in advance in an erase mode, and so-called overwriting cannot be performed.
これに対して磁界変調方式では、その原理上、他の磁気
記録と同様に、古い情報が書き込まれた記録トランクの
上に直接新しい情報を占き込むことができる。すなわち
、即時に新しい情報を重ね書きできる。したがって、別
に消去動作を行うためのモードを設定する必要はなく、
即時オーバーライドが可能である。そのため、緊急時の
重ねどきが必要とされる場合の記録方式としてｉＬ ［
ｌされ始めている。On the other hand, in the magnetic field modulation method, based on its principle, new information can be written directly onto a recording trunk in which old information has been written, similar to other magnetic recording methods. In other words, new information can be immediately overwritten. Therefore, there is no need to set a separate mode for performing the erase operation.
Immediate overrides are possible. Therefore, iL [
It's starting to get worse.
この磁界変調方式に用いられる磁気ヘッド１は、第２図
に示すように、媒体面にレーザ光を照射する光ヘッド２
と記録媒体３を挾んで対向し、磁心コア１ａの先端部と
媒体面との間には、０．１〜０．２ｍｍ程度のギャップ
が設定され、非接触で情報の記録が行われる。これは、
媒体との摺接によるヘッドと媒体の相互の摩耗、損耗、
傷等を避けるためである。As shown in FIG. 2, a magnetic head 1 used in this magnetic field modulation method includes an optical head 2 that irradiates a laser beam onto a medium surface.
A gap of approximately 0.1 to 0.2 mm is set between the tip of the magnetic core 1a and the surface of the medium, and information is recorded without contact. this is,
Mutual wear and tear between the head and the medium due to sliding contact with the medium,
This is to avoid scratches, etc.
発明が解決しようとする問題点
ところが、非接触で情報を記録する場合、コイル１ｂへ
高周波電流を通電し、ヘッドを励磁して磁心ファから磁
束を生じさせ、媒体へ磁界を印加するのであるが、その
際、生ずる磁界の強度は媒体との距離の２〜３乗に反比
例して弱くなる性質がある。そのため、記録媒体を磁化
させるに必要な強い磁界強度を得るには、磁気ヘッド１
の起磁力をＥげ、磁心コア１ａの部分から十分に強い磁
束が発生できるようにすることか必要である。Problems to be Solved by the Invention However, when recording information in a non-contact manner, a high-frequency current is passed through the coil 1b, the head is excited, a magnetic flux is generated from the magnetic core F, and a magnetic field is applied to the medium. At this time, the strength of the generated magnetic field has the property of becoming weaker in inverse proportion to the second to third power of the distance to the medium. Therefore, in order to obtain the strong magnetic field strength necessary to magnetize the recording medium, it is necessary to
It is necessary to increase the magnetomotive force of the magnetic core 1a so that a sufficiently strong magnetic flux can be generated from the magnetic core 1a.
しかしながら、従来の磁気ヘッドは、特に磁心コア１ａ
の部分全体が比較的飽和磁束密度が低いフェライト等の
金属軟磁性材により単体ブロツクとして形成されていた
ので、起磁力を上げるためにフィルｉｔ）にいくら高周
波電流を流したとしても、飽和磁束密度が低いために磁
心コア１ａが低いレベルで飽和してしまい、起磁力に見
合う十分に強い磁束を生じさせることができなかった。However, in the conventional magnetic head, especially the magnetic core 1a
Since the entire part was formed as a single block from a metal soft magnetic material such as ferrite, which has a relatively low saturation magnetic flux density, no matter how much high-frequency current is passed through the filter to increase the magnetomotive force, the saturation magnetic flux density will be low. Since the magnetic core 1a was low, the magnetic core 1a was saturated at a low level, and it was not possible to generate a sufficiently strong magnetic flux commensurate with the magnetomotive force.
更に、ヘッドを励磁して磁化を反転するには、コイル１
ｂに高周波電流を流す必要があるが、磁心コア１ａが唱
体のブロック形状であるので、コイル１ｂに流れる高周
波によりコア内部に渦電流が生し易く、渦電流損が大き
くなる問題があった。したがって、従来の磁気ヘッドで
は、磁心コアの部分の飽和磁束密度が低いことと、高周
波による渦電流損等に起因して起磁力に見合った十分に
強い磁束を生じさせることができず、媒体に印加する十
分に強い磁界強度が得られなかった。Furthermore, in order to excite the head and reverse the magnetization, coil 1
It is necessary to flow a high-frequency current through the coil 1b, but since the magnetic core 1a has a block shape, the high-frequency waves flowing through the coil 1b tend to generate eddy currents inside the core, resulting in a problem of large eddy current loss. . Therefore, in conventional magnetic heads, due to the low saturation magnetic flux density in the magnetic core part and eddy current loss due to high frequency, it is not possible to generate a sufficiently strong magnetic flux commensurate with the magnetomotive force. A sufficiently strong magnetic field strength could not be obtained.
この発明は、上述した従来のヘッド構造の問題点を解消
するために提案されたもので、その目的は磁心コアの飽
和磁束密度を高くすると共に、高周波による渦電／＆損
が生じに＜＜シ、起磁力に見合った十分に強い磁束を発
生できるようにすることにある。This invention was proposed to solve the above-mentioned problems of the conventional head structure, and its purpose is to increase the saturation magnetic flux density of the magnetic core and to prevent the occurrence of eddy electric/& loss due to high frequency. Second, it is possible to generate a sufficiently strong magnetic flux commensurate with the magnetomotive force.
問題点を解消するための手段
この発明は、高飽和磁束密度を打する磁性体膜と絶縁体
膜とを交互に積層し、この積層体を一対の軟磁性体ブロ
ツクによって挾持して磁心コアを形成したことを特徴と
するものである。Means for Solving the Problems This invention consists of alternately laminating magnetic films and insulating films that produce a high saturation magnetic flux density, and sandwiching this laminated body between a pair of soft magnetic blocks to form a magnetic core. It is characterized by the fact that it has been formed.
作用
コイルに流れる高周波電流によりヘッドに与える起磁力
を上げても、飽和磁束密度が高いので、磁心コアには飽
和は生じない。また、磁心コアを形成する磁性体膜は、
極く薄い層であり、これを絶縁体膜で区切って交互に所
定数積層しているので、コイルに高周波を流しても、い
わゆる表皮効果により渦電流の発生は抑制され、全体を
磁化して強い磁束を生じさせることができる。したがっ
て、記録媒体に印加する磁界強度を十分に強（すること
ができる。Even if the magnetomotive force applied to the head is increased by the high-frequency current flowing through the working coil, saturation will not occur in the magnetic core because the saturation magnetic flux density is high. In addition, the magnetic film forming the magnetic core is
These extremely thin layers are separated by insulating films and stacked alternately in a predetermined number of layers, so even when high frequency waves are applied to the coil, the so-called skin effect suppresses the generation of eddy currents, magnetizing the entire coil. Can generate strong magnetic flux. Therefore, the magnetic field strength applied to the recording medium can be made sufficiently strong.
実施例
以上、この発明の実施例について図面を参照して説明す
る。Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.
第１図は本発明に係る磁界変調用磁気ヘッドを示してい
る。FIG. 1 shows a magnetic head for magnetic field modulation according to the present invention.
磁気ヘッド１０は、中心に磁心コア１１を有するＥ形状
に形成されている。磁心コア１１は一対の軟磁性体ブロ
ック１２．１２°によってサンドウィンチ状に挾持され
ている。The magnetic head 10 is formed in an E shape with a magnetic core 11 at the center. The magnetic core 11 is held in a sandwich-like manner by a pair of soft magnetic blocks 12.12°.
磁心コア１１は、高飽和磁束密度を有する磁性体薄膜１
１１と絶縁体薄膜１１２とを交互に所定数積層し、この
積層体１１０を一対の軟磁性体ブロック１２．１２のコ
ア片１２１．１２１′で挾み付け、サンドウィッチした
もので、各磁性体薄膜１１１は絶縁体膜１１２によって
区切られている。The magnetic core 11 is made of a magnetic thin film 1 having a high saturation magnetic flux density.
11 and insulating thin films 112 are alternately laminated in a predetermined number, and this laminated body 110 is sandwiched between core pieces 121 and 121' of a pair of soft magnetic blocks 12 and 12, and each magnetic thin film is 111 is separated by an insulating film 112.
磁性体薄膜１１１は、例えば１８ＫＧ（キロガウス）程
度の高飽和磁束密度を有するＣｏＴａＺｒ系のアモルフ
ァス合金より成るが、これに替えである程度高い飽和磁
束密度を有するセンダスト、パーマロイ等の軟磁性体よ
り成る金属材料で形成しても良く、以下に掲記するのと
同様の効果が得られる。絶縁体膜１１２は、絶縁性を有
する材料、例えば、Ｓ ｉ０２ 、Ａ１２０３等より成
る。磁性体薄膜１１１と絶縁体膜１１２とは、一方の軟
磁性体ブロック１２の鏡面仕上げされた而１２２にスパ
ッタ、蒸着等によって交互に積層成膜される。The magnetic thin film 111 is made of, for example, a CoTaZr-based amorphous alloy having a high saturation magnetic flux density of about 18 KG (kilogauss), but instead of this, it may be made of a metal made of a soft magnetic material such as Sendust or Permalloy, which has a somewhat high saturation magnetic flux density. It may be formed of a material, and the same effects as described below can be obtained. The insulator film 112 is made of an insulating material, such as S i02 or A1203. The magnetic thin film 111 and the insulating film 112 are alternately laminated on the mirror-finished surface 122 of one of the soft magnetic blocks 12 by sputtering, vapor deposition, or the like.
磁性体薄膜１１１をＣＯ基合金アモルファス膜とした場
合の最大飽和磁束密度１６ＫＧは、従来よりヘッドのコ
ア材として用いられてきたフェライト等の軟磁性金属材
の５〜８ＫＧ （キロガウス）程度に比べて格段に高く
、現状で望み得る上限値に近い。The maximum saturation magnetic flux density of 16 KG when the magnetic thin film 111 is made of a CO-based alloy amorphous film is about 5 to 8 KG (kilo Gauss) for soft magnetic metal materials such as ferrite, which have traditionally been used as the core material of heads. This is extremely high and close to the current maximum desired value.
軟磁性体ブロック１２．１２’は、フェライト、センダ
スト、パーマロイ等の軟磁性金属材により略コ字状に形
成され、その一方の片は薄肉であり、積層体１１０を挾
持して磁心コア１１を形成するコア片１２Ｌ Ｌ２１
“となっている。両ブロック１２．１２′のコア片１２
１．１２１“を有する積層体１１０との接合面１２２．
１２２”は研磨加工等によって鏡面仕上げされている。The soft magnetic material block 12.12' is formed of a soft magnetic metal material such as ferrite, sendust, permalloy, etc. in a substantially U-shape, and one piece thereof is thin, and holds the laminate 110 and holds the magnetic core 11. Core piece 12L L21 to be formed
".The core pieces 12 of both blocks 12 and 12'
The bonding surface 122. with the laminate 110 having a diameter of 1.121".
122'' is mirror finished by polishing or the like.
一方の軟磁性体ブロック１２の接合面１２２の−１−に
磁性体薄膜１１１と絶縁体膜１１２とをスバ、夕等によ
り交互に積層し、被着形成せしめた後、他方の軟磁性体
ブロック１２“を接合面１２２′を介して積層体１１０
に接着固定すると、第１図に示すように積層体１１０が
一対の軟磁性体ブロック１２．１２’によって挾持され
、その中央に積層体１１０とコア片１２１．１２１′と
によって磁心コア１１が形成される。その後、磁心コア
部１１に励磁用コイル１３を巻線して装着すると、第１
図に示す構造を持つ磁界変調用磁気ヘット１０が形成さ
れる。A magnetic thin film 111 and an insulating film 112 are alternately laminated on -1- of the bonding surface 122 of one soft magnetic block 12 by using a method such as coating, coating, etc., and then the other soft magnetic block 12 is coated. 12'' to the laminate 110 via the joint surface 122'.
When fixed with adhesive, the laminate 110 is sandwiched between a pair of soft magnetic blocks 12 and 12' as shown in FIG. 1, and a magnetic core 11 is formed in the center by the laminate 110 and core pieces 121 and 121'. be done. After that, when the excitation coil 13 is wound and attached to the magnetic core part 11, the first
A magnetic head 10 for magnetic field modulation having the structure shown in the figure is formed.
軟磁性体ブロック１２．１２′を形成する材料としては
、フェライト、センダスト、パーマロイ簿の軟磁性材が
用いられるが、必す１７もこれらの材料に限定されるも
のではない。例えば、その他、アモルファス合金材料を
用いることも可能セある。As the material for forming the soft magnetic blocks 12, 12', soft magnetic materials such as ferrite, sendust, and permalloy are used, but they are not necessarily limited to these materials. For example, it is also possible to use other amorphous alloy materials.
以上のようなヘッド構成において、光磁気記録にあたり
、コイル１３に記録信号に応じた高周波電流を流すと、
その起磁力によりヘッド１０の磁心コア１１が磁化され
、媒体方向に磁束が発生する。そして、記録信号に応じ
て記録媒体に印加される変調磁界の方向が反転し、光ヘ
ッドから連続照射されるレーザ光との協働により媒体の
記録トランクに情報が記録される。一度記録した記録ト
ラックに別の情報を３き込むには、そのまま同一トラッ
ク上をトレースして重ねて記録して行けば良い。すると
、前の記録された情報は新しい情報によって消去され、
新しい情報が書き込まれる。In the head configuration as described above, when a high frequency current is passed through the coil 13 in accordance with the recording signal during magneto-optical recording,
The magnetic core 11 of the head 10 is magnetized by the magnetomotive force, and a magnetic flux is generated in the direction of the medium. Then, the direction of the modulated magnetic field applied to the recording medium is reversed in accordance with the recording signal, and information is recorded on the recording trunk of the medium in cooperation with the laser beam continuously irradiated from the optical head. To write three different pieces of information to a recording track that has been recorded once, it is sufficient to trace the same track and record it overlappingly. Then, the previously recorded information is erased by the new information,
New information is written.
したがって、別設消去動作を行うためのモードを設定す
る必要はなく、即時オーバーライドができるので、光変
調方式に比べてデータ書き込みに要する時間が短く、そ
の分データ転送速度も速（なる。Therefore, there is no need to set a mode for performing a separate erase operation, and immediate override can be performed, so the time required for data writing is shorter than in the optical modulation method, and the data transfer speed is correspondingly faster.
ヘッド１０を励磁して磁化を反転させるには、上記のよ
うに高周波電流が用いられる。ヘッドの磁心コア１１か
ら発生する磁束の強さは、コイル１３に流れる高周波電
流によって生ずる起磁力に依存する。コイル１３に高周
波電流を流すと、コア部に渦電流が発生しようとするが
、コア１１を形成する磁性体膜１１１は極めて薄い薄膜
であり、それが絶縁体膜１１２で区切られて交互に積層
されているので、１つの磁性体膜１１１をとって見たと
き、あたかもブロック体の表層の薄い層だけが存在する
形となる。したがって、磁性体膜１１２の内部の高周波
による渦電流は抑制される。そして、いわゆる表皮効果
により各磁性体膜１１１・・・は、高周波によって全体
が強く磁化されることとなる。また、高周波による渦電
流損はほとんど生じない。To excite the head 10 and reverse the magnetization, a high frequency current is used as described above. The strength of the magnetic flux generated from the magnetic core 11 of the head depends on the magnetomotive force generated by the high frequency current flowing through the coil 13. When a high frequency current is passed through the coil 13, an eddy current tends to be generated in the core part. However, the magnetic film 111 forming the core 11 is an extremely thin film, and it is separated by insulating films 112 and laminated alternately. Therefore, when one magnetic film 111 is taken and viewed, it appears as if only a thin surface layer of the block body exists. Therefore, eddy currents caused by high frequencies inside the magnetic film 112 are suppressed. Then, due to the so-called skin effect, each magnetic film 111 . . . is entirely strongly magnetized by the high frequency. Furthermore, almost no eddy current loss occurs due to high frequencies.
更に、磁心コア１１を形成する磁性体膜１１１は、現状
における上限に近い程度まで飽和磁束密度か高いので、
コイル１３に高周波電流を流してヘッド１０の起磁力を
大きく上げても、それを１分に許容することができ、飽
和することはない。Furthermore, since the magnetic film 111 forming the magnetic core 11 has a high saturation magnetic flux density close to the current upper limit,
Even if the magnetomotive force of the head 10 is greatly increased by passing a high-frequency current through the coil 13, it can be tolerated for one minute and will not become saturated.
したがって、渦′心流損が抑制され、磁化に見合った磁
束が出せるようになったことと相俟ち、ヘッドの起磁力
を十分に大きく」こげ、それに見合った強い磁束を磁心
コア１１から生じさせることが可能となる。これにより
、記録媒体を磁化させるに７認な十分に強い磁界強度が
得られる。Therefore, the vortex core flow loss is suppressed and magnetic flux commensurate with the magnetization can be produced, and the magnetomotive force of the head is sufficiently increased, and a commensurately strong magnetic flux is generated from the magnetic core 11. It becomes possible to do so. This provides a sufficiently strong magnetic field strength to magnetize the recording medium.
発明の効果
以上のように、本発明に係るヘッド構造によると、高周
波電流を流してもコア内部には渦電流１ｉは極めて少な
く、磁化に見合った磁束を発生させることが可能となる
。また、コアを形成する磁性体膜は飽和磁束密度が１分
に高いので、高周波電流を流して起磁力を十分に上げて
も飽和することはない。したかって、起磁力を十分に大
きくＩ−げ、それに見合った強い磁束を発生させること
ができ、記録媒体に印加する磁界強度を磁化させるに７
妥な十分な強さで生じさせることができる。Effects of the Invention As described above, according to the head structure according to the present invention, even when high-frequency current is passed, there is very little eddy current 1i inside the core, and it is possible to generate magnetic flux commensurate with magnetization. Furthermore, since the magnetic film forming the core has a high saturation magnetic flux density per minute, it will not become saturated even if a high frequency current is applied to sufficiently increase the magnetomotive force. Therefore, it is possible to increase the magnetomotive force sufficiently large and generate a commensurately strong magnetic flux, and the magnetic field strength applied to the recording medium can be set to 7.
can be generated with reasonable sufficient strength.
第１図は本発明に係る磁界変調用磁気へ１ドを示す斜視
図、第２図は磁界変調方式による光磁気記録の原理を説
明する模式図である。
１１・＊＊Ｆ！！ｉ心コア、
１１０・・・積層体、
１１１・・・磁性体膜、
１１２・・・絶縁体膜、
１２．１２’ ・・・軟磁性体ブロック、１２１．１２
１’ −・・コア片。
特許出願人 日本電気ホームエレクトロニクスし去りFIG. 1 is a perspective view showing a magnetic head for magnetic field modulation according to the present invention, and FIG. 2 is a schematic diagram illustrating the principle of magneto-optical recording using the magnetic field modulation method. 11・**F! ! i-core, 110... laminate, 111... magnetic film, 112... insulator film, 12.12'... soft magnetic material block, 121.12
1' - Core piece. Patent applicant: NEC Home Electronics Inc.
Claims (7)
を挾んで対向し、情報信号に応じて変調された磁界を発
生する磁界変調用の磁気ヘッドであって、高飽和磁束密
度を有する磁性体膜と絶縁体膜とを交互に積層し、この
積層体を一対の軟磁性体ブロックによって挾持して磁心
コアを形成したことを特徴とする磁気ヘッド。(1) A magnetic head for magnetic field modulation that faces an optical head that irradiates a laser beam onto a medium surface with a recording medium in between, and generates a magnetic field modulated according to an information signal, and has a high saturation magnetic flux density. A magnetic head characterized in that a magnetic core is formed by alternately laminating magnetic films and insulating films, and sandwiching the laminated body between a pair of soft magnetic blocks.
ァス合金より成ることを特徴とする特許請求の範囲第（
１）項記載の磁気ヘッド。(2) The magnetic film is made of an amorphous alloy having a high saturation magnetic flux density.
1) The magnetic head described in section 1).
性金属材より成ることを特徴とする特許請求の範囲第（
１）項記載の磁気ヘッド。(3) The magnetic film is made of a soft magnetic metal material such as sendust or permalloy.
1) The magnetic head described in section 1).
絶縁材より成ることを特徴とする特許請求の範囲第（１
）項記載の磁気ヘッド。(4) Claim 1, wherein the insulating film is made of an insulating material such as SiO_2, Al_2O_3, etc.
) The magnetic head described in section 2.
等の結晶性金属材より成ることを特徴とする特許請求の
範囲第（１）項記載の磁気ヘッド。(5) The magnetic head according to claim (1), wherein the soft magnetic block is made of a crystalline metal material such as sendust or permalloy.
ることを特徴とする特許請求の範囲第（１）項記載の磁
気ヘッド。(6) The magnetic head according to claim (1), wherein the soft magnetic block is made of an amorphous alloy.
を特徴とする特許請求の範囲第（１）項記載の磁気ヘッ
ド。(7) The magnetic head according to claim (1), wherein the soft magnetic pair block is made of ferrite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4385387A JPS63211101A (en) | 1987-02-26 | 1987-02-26 | Magnetic head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4385387A JPS63211101A (en) | 1987-02-26 | 1987-02-26 | Magnetic head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63211101A true JPS63211101A (en) | 1988-09-02 |
Family
ID=12675269
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4385387A Pending JPS63211101A (en) | 1987-02-26 | 1987-02-26 | Magnetic head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63211101A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5986976A (en) * | 1992-08-28 | 1999-11-16 | Canon Kabushiki Kaisha | Magnetooptical recording head for a recording apparatus including a laminated core having a plurality of magnetic thin films sandwiching insulating films therebetween |
-
1987
- 1987-02-26 JP JP4385387A patent/JPS63211101A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5986976A (en) * | 1992-08-28 | 1999-11-16 | Canon Kabushiki Kaisha | Magnetooptical recording head for a recording apparatus including a laminated core having a plurality of magnetic thin films sandwiching insulating films therebetween |
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