JPS63138546A - Magneto-optical recorder - Google Patents
Magneto-optical recorderInfo
- Publication number
- JPS63138546A JPS63138546A JP28522386A JP28522386A JPS63138546A JP S63138546 A JPS63138546 A JP S63138546A JP 28522386 A JP28522386 A JP 28522386A JP 28522386 A JP28522386 A JP 28522386A JP S63138546 A JPS63138546 A JP S63138546A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- head
- magnetic field
- disk
- optical
- 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
- 239000010409 thin film Substances 0.000 claims abstract description 19
- 239000000463 material Substances 0.000 claims abstract description 17
- 230000004907 flux Effects 0.000 claims abstract description 14
- 230000003287 optical effect Effects 0.000 claims abstract description 14
- 230000035699 permeability Effects 0.000 claims abstract description 13
- 230000005284 excitation Effects 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 8
- 230000005415 magnetization Effects 0.000 claims description 5
- 230000001678 irradiating effect Effects 0.000 claims description 2
- 238000004804 winding Methods 0.000 claims 1
- 239000011521 glass Substances 0.000 abstract description 8
- 229910000808 amorphous metal alloy Inorganic materials 0.000 abstract description 3
- 229910052723 transition metal Inorganic materials 0.000 abstract description 3
- 239000004065 semiconductor Substances 0.000 abstract description 2
- 239000000758 substrate Substances 0.000 abstract description 2
- 239000010408 film Substances 0.000 abstract 2
- 229910052751 metal Inorganic materials 0.000 abstract 1
- 239000002184 metal Substances 0.000 abstract 1
- 150000003624 transition metals Chemical class 0.000 abstract 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 2
- 150000002910 rare earth metals Chemical class 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920003217 poly(methylsilsesquioxane) Polymers 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
- G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
- G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
- G11B11/10532—Heads
- G11B11/10534—Heads for recording by magnetising, demagnetising or transfer of magnetisation, by radiation, e.g. for thermomagnetic recording
- G11B11/10536—Heads for recording by magnetising, demagnetising or transfer of magnetisation, by radiation, e.g. for thermomagnetic recording using thermic beams, e.g. lasers
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、磁界変調方式の光磁気記録装置に関し、特に
重ね書きの効率を改善してデータ転送速度の向上を図る
ものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a magneto-optical recording device using a magnetic field modulation method, and particularly to improving the overwriting efficiency and increasing the data transfer speed.
（従来の技術）
最近、磁気記録と光記録の両方の長所を兼ね備えた光磁
気記録が消去・書換え可能な大容量ファイルとして注目
を集めている。(Prior Art) Recently, magneto-optical recording, which combines the advantages of both magnetic recording and optical recording, has been attracting attention as a large-capacity file that can be erased and rewritten.
第３図につき光磁気記録の原理を説明する。記録媒体１
００には、一般に低キユリ一点もしくは室温付近の磁気
補償温度を何する希土類金属−遷移金属アモルファス金
属合金薄膜、例えばＧｄＴｂ Ｆ ｅ ＋ Ｔ ｂ Ｆ
ｅまたはＧｄＣｏなどが用いられる。そして、情報を
記録するときには、所望の記録位置１００ｐに、レーザ
光ＬＢを照射してそこの温度を低キユリ一点もしくは磁
気補償温度付近まで上げ、記録情報に応じた方向Ｄａに
磁界ＨＧをかける。そうすると、その方向Ｄａに磁化Ｍ
が形成され、一単位の記録ビットが得られる。この記録
ビットを読み取るときは、記録位置１００ｐに読取り用
のレーザ光を照射し、その反射光のカー回転角を検出し
てビットの判別を行う。The principle of magneto-optical recording will be explained with reference to FIG. Recording medium 1
00 generally includes a rare earth metal-transition metal amorphous metal alloy thin film that has a low magnetic compensation temperature at a single point or near room temperature, such as GdTb Fe + T b F.
e or GdCo, etc. are used. When recording information, a laser beam LB is irradiated to a desired recording position 100p to raise the temperature there to a low temperature point or around the magnetic compensation temperature, and a magnetic field HG is applied in a direction Da according to the recording information. Then, magnetization M in that direction Da
is formed, and one unit of recording bit is obtained. When reading this recorded bit, the recorded position 100p is irradiated with a reading laser beam, and the bit is determined by detecting the Kerr rotation angle of the reflected light.
ところで、実際に一連の情報を連続的に記録する方式と
しては、記録情報に応じてレーザ光を変調する光変調方
式上、記録情報に応じて磁界を変調する磁界変調方式と
がある。このうち、光変調方式は、磁界の向きが直流的
に一方向であるために重ね書き（オーバーライド）が出
来ないという欠点がある。これに対し、磁気変調方式は
、磁界の向きが記録情報に応じて交番的に変わるので、
通常の磁気記録と同様に重ね書きが可能である。Incidentally, methods for actually continuously recording a series of information include an optical modulation method that modulates a laser beam according to recorded information, and a magnetic field modulation method that modulates a magnetic field according to recorded information. Among these, the optical modulation method has the disadvantage that overwriting cannot be performed because the direction of the magnetic field is unidirectional in terms of direct current. On the other hand, in the magnetic modulation method, the direction of the magnetic field changes alternately depending on the recorded information, so
Overwriting is possible in the same way as normal magnetic recording.
（発明が解決しようとする問題点）
しかしながら、従来の磁気変調方式の光磁気記録装置は
、高速の重ね書きが困難で、データ転送速度に大きな限
界があった。すなわち、重ね書きの速度を大きくしよう
とすれば、磁界の変調周波数を高くするように磁気ヘッ
ドのインダクタンスを小さくしなければならないが、そ
うすると磁界が弱くなって確実な消去・再書込ができず
、信頼性の点で問題であった。したがって、確実な重ね
書きを行うには、磁界の強さを優先させて大きな磁気ヘ
ッドを使用して変調周波数のほうを抑え、結果的に低い
データ転送速度で妥協せざるを得なかった。(Problems to be Solved by the Invention) However, the conventional magneto-optical recording device using the magnetic modulation method has difficulty in high-speed overwriting, and has a large limit on data transfer speed. In other words, in order to increase the speed of overwriting, the inductance of the magnetic head must be reduced in order to increase the modulation frequency of the magnetic field, but this weakens the magnetic field and makes reliable erasing and rewriting impossible. , which was a problem in terms of reliability. Therefore, in order to perform reliable overwriting, it was necessary to prioritize the strength of the magnetic field, use a large magnetic head, and suppress the modulation frequency, resulting in a compromise with a low data transfer rate.
本発明は、かかる問題点に鑑みてなされたもので、重ね
書きの効率を改善して高いデータ転送速度を可能とする
光磁気記録装置を提供することを目的とする。The present invention has been made in view of the above problems, and an object of the present invention is to provide a magneto-optical recording device that improves the efficiency of overwriting and enables a high data transfer rate.
（問題点を解決するための手段）
上記目的を達成する本発明の構成は、記録媒体の所望の
記録位置に、レーザ光を照射しながら記録情報に応じて
変調された磁界を与えることにより、記録情報に応じた
方向の磁化を形成するようにした磁界変調方式の光磁気
記録装置において、レーザ光を照射する光学ヘッドと変
調磁界を生成する磁気ヘッドとを互いに対向するように
記録媒体の両側にそれぞれ配置するとともに、記録位置
に近接して記録媒体の面と垂直な方向に延長する高透磁
率高飽和磁束密度の薄膜材を配置してなることを特徴と
する。(Means for Solving the Problems) The configuration of the present invention that achieves the above object is to apply a magnetic field modulated according to recorded information to a desired recording position of a recording medium while irradiating a laser beam. In a magnetic field modulation type magneto-optical recording device that forms magnetization in a direction corresponding to recorded information, an optical head that irradiates a laser beam and a magnetic head that generates a modulated magnetic field are placed on both sides of a recording medium so as to face each other. A thin film material with high magnetic permeability and high saturation magnetic flux density is arranged close to the recording position and extending in a direction perpendicular to the surface of the recording medium.
（作用）
磁気ヘッドより生成された磁界は、収束するようにして
記録媒体の記録位置を通り高透磁率高飽和磁束密度の薄
膜材に集められる。これにより、非常に強い磁界が記録
位置に与えられ、少ない駆動電力で、したがって高い効
率で所望の方向の磁化が形成され、高周波の変調磁界の
下でも確実な重ね書きが行える。また、薄膜材は、レー
ザ光の光軸とほぼ並行に延長しているので、レーザ光の
照射に悪影響を及ぼすことはない。(Function) The magnetic field generated by the magnetic head passes through the recording position of the recording medium in a converging manner and is collected in a thin film material with high magnetic permeability and high saturation magnetic flux density. As a result, a very strong magnetic field is applied to the recording position, magnetization in a desired direction is formed with low drive power and therefore high efficiency, and reliable overwriting can be performed even under a high frequency modulated magnetic field. In addition, since the thin film material extends substantially parallel to the optical axis of the laser beam, it does not adversely affect the irradiation of the laser beam.
（実施例）
以下、第１図および第２図を参照して本発明の詳細な説
明する。(Example) Hereinafter, the present invention will be described in detail with reference to FIGS. 1 and 2.
第１図に示す装置構成において、記録媒体１０は光磁気
ディスクであり、ガラスまたはアクリル系樹脂などから
なる基板１２と、上記のような希土類金属−遷移金属ア
モルファス金属合金薄膜からなる記録層１４とで構成さ
れている。このディスク１０の上方には光学へラド１６
が配置され、その中の少なくとも集光レンズ１８は矢印
Ｆ ａ、Ｆｂで示すディスク半径方向に移動できるよう
になっている。半導体レーザ２０は、連続発振して直流
的にほぼ一定強度のレーザ光ＬＢを出力する。In the device configuration shown in FIG. 1, a recording medium 10 is a magneto-optical disk, and includes a substrate 12 made of glass or acrylic resin, and a recording layer 14 made of a rare earth metal-transition metal amorphous metal alloy thin film as described above. It consists of Above this disk 10 is an optical disc 16.
are arranged, and at least the condenser lens 18 therein is movable in the disk radial direction indicated by arrows Fa and Fb. The semiconductor laser 20 continuously oscillates and outputs a laser beam LB having a substantially constant direct current intensity.
このレーザ光ＬＢは集光レンズ１８を通ってディスク１
０の記録層１４の所望の記録位置１４ｐに照射される。This laser beam LB passes through the condensing lens 18 to the disk 1.
A desired recording position 14p of the recording layer 14 of 0 is irradiated.
なお、レーザ２０と集光レンズ１８との間にはサーボ信
号をつくるためのビームスプリッタ（図示せず）などが
設けられている。Note that a beam splitter (not shown) or the like is provided between the laser 20 and the condenser lens 18 to generate a servo signal.
一方、ディスク１０の下方には磁気へラド２２が配置さ
れ、これは記録位置１４ｐを介して光学ヘッド１６と対
向している。この磁気ヘッド２２は、軟磁性のコア２４
に励磁コイル２６を巻装して小型サイズにつくられてお
り、インダクタンスが小さいので高周波駆動が可能とな
っている。コイル端子２８．３０には記録情報に応じて
変調された電流信号が記録回路（図示せず）より供給さ
れ、これにより記録情報に応じて変調された高周彼（例
えばＩＭＨｚ）の磁界ＨＧが生成される。On the other hand, a magnetic helad 22 is arranged below the disk 10, and faces the optical head 16 via the recording position 14p. This magnetic head 22 has a soft magnetic core 24
The excitation coil 26 is wound around the magnet to make it compact, and the small inductance makes it possible to drive at a high frequency. A current signal modulated according to the recorded information is supplied to the coil terminals 28 and 30 from a recording circuit (not shown), and thereby a high frequency (for example, IMHz) magnetic field HG modulated according to the recorded information is supplied to the coil terminals 28 and 30. generated.
さて、本実施例では、記録位置１４ｐのすぐ真上に、高
透磁率高飽和磁束密度の薄膜材、例えばＧｏ拳ＴａｅＺ
ｒなどのアモルファス軟磁性薄膜材３２がガラス仮３４
．３６に支持されて配置されている。そして、図示のよ
うに、この薄膜材３２は記録層１４の面に対し垂直な方
向に延長している。Now, in this embodiment, a thin film material with high magnetic permeability and high saturation magnetic flux density, such as Goken TaeZ, is placed directly above the recording position 14p.
The amorphous soft magnetic thin film material 32 such as
．． 36. As shown in the figure, this thin film material 32 extends in a direction perpendicular to the surface of the recording layer 14.
しかして、上記のように磁気ヘッド２２より発生された
磁界ＨＧは収束するようにして記録層１４の記録位置１
４ａを通り高透磁率高飽和磁束密度の薄膜材３２に集め
られ、これによって非常に強い磁界が記録位置に与えら
れ、少ない駆動電力で、したがって高い効率で所望の方
向の磁化が形成される。しかも、磁気ヘッド２２から与
えられる磁界ＨＧは高周波（ＩＭＨｚ）であり、このよ
うな磁界の下で確実な重ね書きが可能であり、これによ
ってデータ転送速度の向上が図れる。As described above, the magnetic field HG generated by the magnetic head 22 is converged to the recording position 1 of the recording layer 14.
4a and are collected in a thin film material 32 of high magnetic permeability and high saturation magnetic flux density, which provides a very strong magnetic field at the recording position, creating magnetization in the desired direction with low drive power and therefore with high efficiency. Moreover, the magnetic field HG applied from the magnetic head 22 is of high frequency (IMHz), and reliable overwriting is possible under such a magnetic field, thereby improving the data transfer speed.
なお、ディスク１０はスピンドルモータ（図示せず）に
よって所定速度で回転しており、光学へ７ド１６．磁気
ヘッド２２は矢印Ｆ ａ、Ｆ ｂの方向に移動可能であ
るが、高透磁率高飽和磁束密度薄膜材３２および支持ガ
ラス３４．３６もそれらと一体的にあるいは連動して同
方向に移動するようになっている。Note that the disk 10 is rotated at a predetermined speed by a spindle motor (not shown), and the disk 10 is rotated at a predetermined speed by a spindle motor (not shown). The magnetic head 22 is movable in the directions of arrows F a and F b, and the high magnetic permeability high saturation magnetic flux density thin film material 32 and the support glasses 34 and 36 also move in the same direction, either integrally or in conjunction with them. It looks like this.
第２図に、高透磁率高飽和磁束密度薄膜材３２および支
持ガラス３４．３６の組立体を詳細に示す。支持棒３８
の他端（図示せず）は光学ヘッド１６に結合されていて
よい。なお、この組立体は薄膜材３２がレーザ光ＬＢの
光軸と並行なため、レーザ光ＬＢをほとんどそのまま透
過し、レーザ光ＬＢの照射に影響を及ぼすことはない。FIG. 2 shows the assembly of high magnetic permeability high saturation magnetic flux density thin film material 32 and support glasses 34, 36 in detail. Support rod 38
The other end (not shown) may be coupled to optical head 16 . Note that in this assembly, since the thin film material 32 is parallel to the optical axis of the laser beam LB, the laser beam LB is transmitted almost as is, and does not affect the irradiation of the laser beam LB.
以上、一実施例を説明したが、種々の変形、変更が可能
であり、例えば上記の高透磁率高飽和磁束密度薄膜材３
２および支持ガラス３４．３８を磁気ヘッド２２のある
側に配置することも可能である。Although one embodiment has been described above, various modifications and changes are possible. For example, the above-mentioned high magnetic permeability high saturation magnetic flux density thin film material 3
It is also possible to arrange the magnetic head 22 and the supporting glass 34, 38 on the side with the magnetic head 22.
（発明の効果）
上述のように、本発明によれば、記録媒体の所望の記録
位置に近接して記録媒体の面と垂直な方向に延長する高
透磁率高飽和磁束密度の薄膜材を設けることにより、効
率よく強い磁界を該記録位置に与えられるので、高周波
磁界の下で確実な重ね書きが可能であり、データ転送速
度の向上が図れる。(Effects of the Invention) As described above, according to the present invention, a thin film material with high magnetic permeability and high saturation magnetic flux density is provided close to a desired recording position of a recording medium and extending in a direction perpendicular to the surface of the recording medium. As a result, a strong magnetic field can be efficiently applied to the recording position, so reliable overwriting can be performed under a high frequency magnetic field, and data transfer speed can be improved.
第１図は、本発明の一実施例による磁界変調方式光磁気
記録装置の構成を示す一部断面側面図、第２図は、第１
図の高透磁率高飽和磁束密度薄膜材３２および支持ガラ
ス３４，３θの組立体を詳しく示す斜視図、および
第３図は、光磁気記録の原理を説明するための略斜視図
である。
１０・・・・光磁気ディスク、 １４・・・・記録層
、 １４ａ・・・・記録位置、 １６・・・・光学
ヘッド、 ２２・・・・磁気ヘッド、 ３２・・・・高
透磁率高飽和磁束密度薄膜材、 ３４．３８・・・・支
持ガラス。FIG. 1 is a partially sectional side view showing the configuration of a magnetic field modulation type magneto-optical recording device according to an embodiment of the present invention, and FIG.
FIG. 3 is a perspective view showing in detail the assembly of the high magnetic permeability, high saturation magnetic flux density thin film material 32 and the supporting glass 34, 3θ, and FIG. 3 is a schematic perspective view for explaining the principle of magneto-optical recording. 10... Magneto-optical disk, 14... Recording layer, 14a... Recording position, 16... Optical head, 22... Magnetic head, 32... High magnetic permeability. Saturation magnetic flux density thin film material, 34.38...Support glass.
Claims (3)
ながら記録情報に応じて変調された磁界を与えることに
より、前記記録情報に応じた方向の磁化を形成するよう
にした磁界変調方式の光磁気記録装置において、 前記レーザ光を照射する光学ヘッドと前記変調磁界を生
成する磁気ヘッドとを互いに対向するように前記記録媒
体の両側にそれぞれ配置するとともに、前記記録位置に
近接して前記記録媒体の面と垂直な方向に延長する高透
磁率高飽和磁束密度の薄膜材を配置してなることを特徴
とする光磁気記録装置。(1) A magnetic field modulation method in which a magnetic field modulated according to the recorded information is applied to a desired recording position of a recording medium while irradiating a laser beam, thereby forming magnetization in a direction according to the recorded information. In the magneto-optical recording device, an optical head that irradiates the laser beam and a magnetic head that generates the modulated magnetic field are arranged on both sides of the recording medium so as to face each other, and the optical head that irradiates the laser beam and the magnetic head that generates the modulated magnetic field are arranged on both sides of the recording medium, and A magneto-optical recording device comprising a thin film material with high magnetic permeability and high saturation magnetic flux density that extends in a direction perpendicular to the surface of a recording medium.
巻装して構成することを特徴とする特許請求の範囲第１
項に記載の光磁気記録装置。(2) The magnetic head is constructed by winding an excitation coil around a soft magnetic core.
2. Magneto-optical recording device as described in .
ヘッドのある側に設けることを特徴とする特許請求の範
囲第１項に記載の光磁気記録装置。(3) The magneto-optical recording device according to claim 1, wherein the thin film material having high magnetic permeability and high saturation magnetic flux density is provided on the side where the optical head is located.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28522386A JPS63138546A (en) | 1986-11-29 | 1986-11-29 | Magneto-optical recorder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28522386A JPS63138546A (en) | 1986-11-29 | 1986-11-29 | Magneto-optical recorder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63138546A true JPS63138546A (en) | 1988-06-10 |
Family
ID=17688697
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28522386A Pending JPS63138546A (en) | 1986-11-29 | 1986-11-29 | Magneto-optical recorder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63138546A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001097214A3 (en) * | 2000-06-16 | 2002-04-04 | Koninkl Philips Electronics Nv | Record head for thermally assisted magnetic recording |
-
1986
- 1986-11-29 JP JP28522386A patent/JPS63138546A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001097214A3 (en) * | 2000-06-16 | 2002-04-04 | Koninkl Philips Electronics Nv | Record head for thermally assisted magnetic recording |
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