JPS60261052A - Optical head for optomagnetic disc - Google Patents
Optical head for optomagnetic discInfo
- Publication number
- JPS60261052A JPS60261052A JP59117180A JP11718084A JPS60261052A JP S60261052 A JPS60261052 A JP S60261052A JP 59117180 A JP59117180 A JP 59117180A JP 11718084 A JP11718084 A JP 11718084A JP S60261052 A JPS60261052 A JP S60261052A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic field
- optical
- recording
- recording medium
- optical head
- 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
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
-
- 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
Landscapes
- Optical Head (AREA)
- Recording Or Reproducing By Magnetic Means (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は光磁気ディスク用光学ヘッドに係り、該光学ヘ
ッドの改良に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an optical head for a magneto-optical disk, and relates to an improvement of the optical head.
（ａｌ 産業上の利用分野
周知のように光磁気ディスク装置は光磁気光学的な効果
によって光記録媒体に情報の記録・再生と、記録された
情報を消去とを行う装置である。(al) Field of Industrial Application As is well known, a magneto-optical disk device is a device that records and reproduces information on an optical recording medium and erases recorded information using magneto-optical effects.
この光磁気ディスク装置は、記録媒体のトラックの所定
位置にレーザ光を照射し、その所定位置に磁気的に情報
の記録と、トラックの所定位置より反射されたレーザ光
を捕捉し電気信号に変換して情報の再生とを行う光学系
を備えた光学ヘッドと、記録信号および消去信号に対応
して磁場の磁極を反転させて情報の記録および消去とを
行う磁界発生手段とより構成されている。This magneto-optical disk device irradiates a laser beam onto a predetermined position on a track of a recording medium, magnetically records information at the predetermined position, captures the laser beam reflected from a predetermined position on the track, and converts it into an electrical signal. an optical head equipped with an optical system for reproducing information; and a magnetic field generating means for recording and erasing information by reversing the magnetic pole of a magnetic field in response to a recording signal and an erasing signal. .
（ｂ） 従来の技術
第２図は従来の一実施例の光学ヘッドを説明するための
概略構成図である。すなわち、第２図に示すように光学
ヘッドは記録媒体１を照射するためのレーザ光を発生す
る光学系４と、光学系４にて発生したレーザ光を記録媒
体１のトラックの所定位置を照射するよう働く光ピツク
アップ３とよりなり、光学系４により発生したレーザ光
は、記録媒体１の一方の面の下方に設けられた光ピンク
アップ３の対物レンズ３１を通って焦光され記録媒体１
のトラックの所定位置を照射している。(b) Prior Art FIG. 2 is a schematic diagram illustrating an optical head according to an embodiment of the prior art. That is, as shown in FIG. 2, the optical head includes an optical system 4 that generates a laser beam for irradiating the recording medium 1, and a laser beam generated by the optical system 4 that irradiates a predetermined position on a track of the recording medium 1. The laser beam generated by the optical system 4 passes through the objective lens 31 of the optical pickup 3 provided below one surface of the recording medium 1, and is focused onto the recording medium 1.
A predetermined position on the track is irradiated.
また、記録媒体の他の一面の上方から電磁石２または永
久磁石２１によりレーザ光のトラック照射位置の反対の
トランク面に垂直方向に記録信号および消去信号に対応
した磁界が印加されている。Further, from above the other surface of the recording medium, a magnetic field corresponding to a recording signal and an erasing signal is applied perpendicularly to the trunk surface opposite to the track irradiation position of the laser beam by the electromagnet 2 or the permanent magnet 21.
このようにディスクの両面の対称位置にレーザ光の照射
と、記録あるいは消去信号に対応した磁界の印加とを同
時に行うことにより、記録層の磁化を局所的に反転して
情報の記録あるいは反転された磁極を元にもどす消去と
を行っている。In this way, by simultaneously irradiating laser light onto symmetrical positions on both sides of the disk and applying a magnetic field corresponding to a recording or erasing signal, the magnetization of the recording layer is locally reversed and information is recorded or reversed. The magnetic pole is erased by returning it to its original state.
第３図は従来の他の実施例の光学ヘッドを説明するため
の概略構成図である。第３図に示すように光ピツクアッ
プ６は、中心軸に光路を持ちその光路を通って光学系４
よりのレーザ光を記録媒体１のトラックの所定位置への
照射を行うとともに、その外周にコイル５が捲回され、
コイル５に流れる記録電流および消去電流によって記録
および消去磁界を発生し、記録媒体１のトランクの所定
位置に情報の記録および記録の消去を行う。FIG. 3 is a schematic configuration diagram for explaining another conventional optical head. As shown in FIG. 3, the optical pickup 6 has an optical path along its central axis, and the optical system 4 passes through the optical path.
A coil 5 is wound around the outer periphery of the laser beam irradiated onto a predetermined position on the track of the recording medium 1.
Recording and erasing magnetic fields are generated by the recording current and erasing current flowing through the coil 5, and information is recorded and erased at a predetermined position on the trunk of the recording medium 1.
（Ｃ） 発明が解決しようとする問題点ところが上述功
第２図の光学ヘッドの構造では、記録媒体１を挟んで設
けられた電磁石２または永久磁石２１と光ピンクアップ
３および光学系４との位置合わせを必要とするとともに
ディスク装着時には電磁石２または永久磁石２１を一時
退避させねばならないといった構造上の欠点があり、ま
たデータゾーン全体をカバーするだけの大きな電磁石ま
たは永久磁石を必要とし形状が大きくなる欠点がある。(C) Problems to be Solved by the Invention However, in the structure of the optical head shown in FIG. There are structural disadvantages such as the need for positioning and the need to temporarily retreat the electromagnet 2 or permanent magnet 21 when the disk is installed.Also, it requires an electromagnet or permanent magnet large enough to cover the entire data zone and is large in shape. There is a drawback.
また、コイル５により発生する磁界と光学系のフォーカ
ストラッキング用に発生する磁界とが干渉を起こし光学
系のフォーカストラッキングの精度が得られ難いといっ
た問題がある。Further, there is a problem in that the magnetic field generated by the coil 5 and the magnetic field generated for focus tracking of the optical system interfere with each other, making it difficult to obtain the accuracy of focus tracking of the optical system.
（ｄ） 問題点を解決するための手段
本発明は、上記問題点を解消した小型化と簡素化が得ら
れる光学ヘッドを提案するもので、その手段は、光と磁
気とによって記録媒体に情報の記録・再生を行う光磁気
ディスク用光学ヘッドであって、媒体との相対運動によ
って前記記録媒体面を浮上するエアースライダの上に光
学系を搭載し、前記エアースライダに前記光学系の光透
過路を設けるとともに、該透過路周囲に情報の記録およ
び消去を目的とした垂直磁界発生手段を内在せしめた構
造とした光磁気ディスク用光学ヘッドによってなされる
。(d) Means for Solving the Problems The present invention proposes an optical head that solves the above-mentioned problems and can be miniaturized and simplified. An optical head for a magneto-optical disk that performs recording and reproduction of information, in which an optical system is mounted on an air slider that flies above the surface of the recording medium by relative movement with the medium, and the air slider has light transmission from the optical system. This is achieved by an optical head for a magneto-optical disk having a structure in which a perpendicular magnetic field generating means for recording and erasing information is provided around the transmission path.
ｆｅｌ 作用
即ち、記録媒体の回転による相対運動によって媒体面を
浮上するエアースライダに照射および反射レーザ光の光
路となる空洞を設けるとともに、その空洞の周囲に記録
媒体に垂直な方向に磁界を発生する磁界発生手段と、前
記光路を通って記録媒体のトランクの所定面にレーザ光
を焦光させながら照射する光学系を前記エアースライダ
の上に設け、磁界発生手段と光学系を一体構造とした光
学ヘッドとすることにより、光学系の光学調整が不要と
なり、かつ強い記録・再生磁界が得られ精度の良い記録
・再生を行うことができる。In other words, a cavity is provided in the air slider that floats above the medium surface due to the relative motion caused by the rotation of the recording medium, which serves as an optical path for the irradiated and reflected laser beams, and a magnetic field is generated around the cavity in a direction perpendicular to the recording medium. A magnetic field generating means and an optical system that focuses and irradiates a predetermined surface of the trunk of a recording medium through the optical path with a laser beam are provided on the air slider, and the magnetic field generating means and the optical system are integrated into an optical system. By using a head, there is no need for optical adjustment of the optical system, and a strong recording/reproducing magnetic field can be obtained, allowing highly accurate recording/reproducing.
（ｆ） 実施例 以下、図面を参照して実施例によって詳細に説明する。(f) Example Hereinafter, embodiments will be described in detail with reference to the drawings.
第４図は本発明にかかる一実施例のエアースライダの側
断面図、第１図は本発明にがかる一実施例の光学ヘッド
の概略構成図であり、第２図および第３図と同一符号は
同一部位を示している。FIG. 4 is a side sectional view of an air slider according to an embodiment of the present invention, and FIG. 1 is a schematic configuration diagram of an optical head according to an embodiment of the present invention, with the same reference numerals as in FIGS. 2 and 3. indicate the same part.
すなわち、第４図の側断面に示すように、記録媒体１の
移動による相対運動によって記録媒体面と一定間隔を保
って浮上するエアースライダ７は軟磁性体で形成され、
記録媒体１側からその反対側につき抜けた空洞７１が設
けられ、その空洞７１の周囲で少なくとも記録媒体１の
近い方にコイル７２が回攪された構造となっている。こ
のコイル７１に流れる電流により空洞７１のまわりの磁
性体からレーザ光の光軸と平行、すなわち記録媒体１面
に垂直な方向に磁界が強化され印加される。この印加磁
界は、情報の記録時と消去時に逆転させる必要があるが
、コイル７３に流す電流の方向を逆転させることにより
容易に実現できる。That is, as shown in the side cross section of FIG. 4, the air slider 7, which floats at a constant distance from the surface of the recording medium due to the relative movement caused by the movement of the recording medium 1, is formed of a soft magnetic material.
A cavity 71 extending from the recording medium 1 side to the opposite side is provided, and a coil 72 is wound around the cavity 71 at least toward the side near the recording medium 1. Due to the current flowing through the coil 71, a magnetic field is strengthened and applied from the magnetic material around the cavity 71 in a direction parallel to the optical axis of the laser beam, that is, perpendicular to the surface of the recording medium. This applied magnetic field needs to be reversed when recording and erasing information, but this can be easily achieved by reversing the direction of the current flowing through the coil 73.
次に、第１図の光学ヘッドの概略構成図に示すように、
光学系４は記録媒体を照射するレーザ光を発生する半導
体レーザ８と、照射レーザ光と記録媒体よりの反射レー
ザ光とを分離するよう働くビームスプリンタ９と、照射
レーザ光が常に記録媒体１のトラックの所定位置を照射
するよう補正する回転ミラー１０と、反射レーザ光がビ
ームスプリンタ９を通過するようにするλ／４板１２と
、トランクの所定位置に焦点を持ち照射レーザ光の集束
と反射レーザ光の捕捉とを行う対物レンズ１３と、さら
にビームスプリッタ９により分離された反射レーザ光を
検知して記録情報を電気信号に変換する光検知器１４と
より構成されており、対物レンズ１３はエアースライダ
７の空洞７１に嵌入され、他の光学系はエアースライダ
７の上に搭載され、照射レーザ光および反射レーザ光が
空洞７１に設けられた対物レンズ１３を通過するよう配
設されている。Next, as shown in the schematic configuration diagram of the optical head in FIG.
The optical system 4 includes a semiconductor laser 8 that generates a laser beam that irradiates the recording medium, a beam splinter 9 that works to separate the irradiated laser beam from the reflected laser beam from the recording medium, and a beam splinter 9 that makes sure that the irradiated laser beam is always on the recording medium 1. A rotating mirror 10 corrects the irradiation to a predetermined position on the truck, a λ/4 plate 12 that allows the reflected laser light to pass through the beam splinter 9, and a λ/4 plate 12 that focuses the reflected laser light on a predetermined position on the trunk to focus and reflect the irradiated laser light. The objective lens 13 is composed of an objective lens 13 that captures laser light, and a photodetector 14 that detects the reflected laser light separated by a beam splitter 9 and converts recorded information into an electrical signal. It is fitted into a cavity 71 of the air slider 7, and other optical systems are mounted on the air slider 7, and arranged so that the irradiated laser beam and the reflected laser beam pass through an objective lens 13 provided in the cavity 71. .
その動作は、半導体レーザ８にて発生したレーザ光はビ
ームスプリンタ９と回転ミラー１０とλ／４板１２とを
介して対物レンズ１３に入射される。対物レンズ１３は
入射されたレーザ光を集束してエアースライダ７の空洞
７１を通って記録媒体１のトランク面に照射する。一方
、トランク面よりの反射光（受光レーザ光）は対物レン
ズ１３により捕捉されλ／４板１２と回転ミラー１０と
ビームスプリッタ９を介して光検知器１４に入射され、
光検知器１４によりアナログ電気信号に変換され情報の
再生が行われる。In operation, a laser beam generated by a semiconductor laser 8 is incident on an objective lens 13 via a beam splinter 9, a rotating mirror 10, and a λ/4 plate 12. The objective lens 13 focuses the incident laser light and irradiates it onto the trunk surface of the recording medium 1 through the cavity 71 of the air slider 7 . On the other hand, the reflected light (received laser light) from the trunk surface is captured by the objective lens 13 and enters the photodetector 14 via the λ/4 plate 12, rotating mirror 10, and beam splitter 9.
The photodetector 14 converts the signal into an analog electrical signal and reproduces the information.
このように光学ヘッドの構造をレーザ光および磁界がエ
アースライダ７の空洞７１を通っ記録媒体１のトラック
の所定位置を照射および印加するよう光学系と磁界発生
手段とを一体構造としたことにより、強い磁界と小型化
が得られる。In this way, the structure of the optical head is such that the optical system and the magnetic field generating means are integrated so that the laser beam and magnetic field pass through the cavity 71 of the air slider 7 and irradiate and apply a predetermined position on the track of the recording medium 1. A strong magnetic field and miniaturization can be obtained.
また、磁気ディスクに用いられているヘッドの例から明
らかなように、エアースライダの浮上性は安定であり、
浮上変動は０．１μｍ以下と非常に小さい。従って通常
の光学ヘッドで使われているフォーカシング用の機構や
ヘッドピックアンプ部の複雑な機構部分が不要となる。Furthermore, as is clear from the examples of heads used in magnetic disks, the air slider has stable flying properties.
The fluctuation in flying height is very small, less than 0.1 μm. Therefore, there is no need for a focusing mechanism or a complicated mechanical part of the head pick amplifier used in a normal optical head.
第４図に示す回転ミラー１０による光路補正により代用
され機構部分の簡略化を行っている。また、フォカスト
ラッキング磁界とコイル７２との干渉もなくなり精度の
良い記録・再生が得られる。This is replaced by optical path correction using a rotating mirror 10 shown in FIG. 4, thereby simplifying the mechanical part. Further, there is no interference between the focus tracking magnetic field and the coil 72, and highly accurate recording and reproduction can be obtained.
なお、本実施例ではエアースライダに光路となる空洞を
設けたが空洞部分を透明物質を充填した構造とするも差
支えないことは勿論である。In this embodiment, the air slider is provided with a cavity that serves as an optical path, but it goes without saying that the cavity may be filled with a transparent material.
（ｇｌ 発明の効果
以上の実施例から明らかなように、本発明によれば記録
・再生を行う光学系と、記録・消去に必要な磁気発生手
段とを一体構造にしてエアースライダに組み込むことに
より、光磁気記録用光学ヘッドの小型化と簡略化が得ら
れる。(gl Effects of the Invention As is clear from the above embodiments, according to the present invention, the optical system for recording and reproducing and the magnetic generation means necessary for recording and erasing are integrated into an air slider. , it is possible to downsize and simplify the optical head for magneto-optical recording.
第１図は本発明にがかる一実施例の光学ヘッドの概略構
成図、第２図は従来の一実施例の光学ヘッドを説明する
ための概略構成図、第３図は従来の他の実施例の光学ヘ
ッドを説明するための概略構成図、第４図は本発明にが
かる一実施例のエアースライダの側断面図である。
同図において、１は記録媒体、２は電磁石、２１は永久
磁石、３．６は光ピンクアンプ、４は光学系、５，７２
はコイル、７はエアースライダ、３１，６１７、は対物
レンズ、７１は空洞、８は半導体レーザ、９はビームス
プリッタ、１０は回転ミラー、１２はλ／４板、１３は
対物レンズ、１４は光検知器をそれぞれ示している。
第１図
１４
第４図FIG. 1 is a schematic configuration diagram of an optical head according to an embodiment of the present invention, FIG. 2 is a schematic configuration diagram for explaining an optical head of a conventional embodiment, and FIG. 3 is another conventional embodiment. FIG. 4 is a sectional side view of an air slider according to an embodiment of the present invention. In the figure, 1 is a recording medium, 2 is an electromagnet, 21 is a permanent magnet, 3.6 is an optical pink amplifier, 4 is an optical system, 5, 72
is a coil, 7 is an air slider, 31, 617 is an objective lens, 71 is a cavity, 8 is a semiconductor laser, 9 is a beam splitter, 10 is a rotating mirror, 12 is a λ/4 plate, 13 is an objective lens, 14 is a light Each detector is shown. Figure 1 14 Figure 4
Claims (1)
光磁気ディスク用光学ヘッドであって、媒体との相対運
動によって前記記録媒体面を浮上するエアースライダの
上に光学系を搭載し、前記エアースライダに前記光学系
の光透過路を設けるとともに、該透過路周囲に情報の記
録および消去を目的とした垂直磁界発生手段を内在せし
めた構造としたことを特徴とする光磁気ディスク用光学
ヘッド。This is an optical head for a magneto-optical disk that records and reproduces information on a recording medium using light and magnetism. An optical head for a magneto-optical disk, characterized in that an air slider is provided with a light transmission path for the optical system, and a perpendicular magnetic field generating means for recording and erasing information is built around the transmission path. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59117180A JPS60261052A (en) | 1984-06-06 | 1984-06-06 | Optical head for optomagnetic disc |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59117180A JPS60261052A (en) | 1984-06-06 | 1984-06-06 | Optical head for optomagnetic disc |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60261052A true JPS60261052A (en) | 1985-12-24 |
Family
ID=14705397
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59117180A Pending JPS60261052A (en) | 1984-06-06 | 1984-06-06 | Optical head for optomagnetic disc |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60261052A (en) |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62204456A (en) * | 1986-03-03 | 1987-09-09 | Nippon Telegr & Teleph Corp <Ntt> | Optical disk device |
| FR2621412A1 (en) * | 1987-10-05 | 1989-04-07 | Bull Sa | DEVICE FOR OPTICALLY READING AND MAGNETIC WRITING OF AN INFORMATION CARRIER |
| JPH0214448A (en) * | 1987-10-05 | 1990-01-18 | Bull Sa | Automatic control type apparatus for optical reading and magnetic programming of information medium |
| JPH0218720A (en) * | 1988-05-12 | 1990-01-23 | Digital Equip Corp <Dec> | Optical head device |
| EP0390584A2 (en) * | 1989-03-31 | 1990-10-03 | Sharp Kabushiki Kaisha | Photomagnetic composite head |
| JPH0352829U (en) * | 1989-09-22 | 1991-05-22 | ||
| US5020041A (en) * | 1987-03-06 | 1991-05-28 | Hitachi, Ltd. | Magneto-optical memory apparatus having a floating magnetic head |
| US5022018A (en) * | 1989-02-16 | 1991-06-04 | Minnesota Mining And Manufacturing Company | System for applying a perpendicular magnetic field to the illuminated side of a magneto-optic medium |
| US5022017A (en) * | 1988-04-29 | 1991-06-04 | Laser Magnetic Storage International Company | Magneto optic data recording system with variable field strength, actuator therefor and method of providing |
| US5161134A (en) * | 1989-06-29 | 1992-11-03 | Digital Equipment Corporation | Method for increasing linear bit density in magneto-optical storage media |
| US5197050A (en) * | 1989-10-06 | 1993-03-23 | Fuji Xerox Co., Ltd. | Flying head for a magneto-optical recording drive |
| US5255260A (en) * | 1989-07-28 | 1993-10-19 | Matsushita Electric Industrial Co., Ltd. | Optical recording apparatus employing stacked recording media with spiral grooves and floating optical heads |
| US5295122A (en) * | 1991-07-09 | 1994-03-15 | Fuji Xerox Co., Ltd. | Flying head of a magneto-optical recording apparatus |
| KR20010022150A (en) * | 1997-07-23 | 2001-03-15 | 추후 | Slider for optical disc data storage system |
| US6574015B1 (en) | 1998-05-19 | 2003-06-03 | Seagate Technology Llc | Optical depolarizer |
-
1984
- 1984-06-06 JP JP59117180A patent/JPS60261052A/en active Pending
Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62204456A (en) * | 1986-03-03 | 1987-09-09 | Nippon Telegr & Teleph Corp <Ntt> | Optical disk device |
| US5020041A (en) * | 1987-03-06 | 1991-05-28 | Hitachi, Ltd. | Magneto-optical memory apparatus having a floating magnetic head |
| FR2621412A1 (en) * | 1987-10-05 | 1989-04-07 | Bull Sa | DEVICE FOR OPTICALLY READING AND MAGNETIC WRITING OF AN INFORMATION CARRIER |
| JPH01128247A (en) * | 1987-10-05 | 1989-05-19 | Bull Sa | Apparatus for optical reading and magnetic writing of information medium |
| JPH0214448A (en) * | 1987-10-05 | 1990-01-18 | Bull Sa | Automatic control type apparatus for optical reading and magnetic programming of information medium |
| US5050143A (en) * | 1987-10-05 | 1991-09-17 | Bull, S.A. | Device for optical reading and magnetic writing on a data carrier |
| US5022017A (en) * | 1988-04-29 | 1991-06-04 | Laser Magnetic Storage International Company | Magneto optic data recording system with variable field strength, actuator therefor and method of providing |
| JPH0218720A (en) * | 1988-05-12 | 1990-01-23 | Digital Equip Corp <Dec> | Optical head device |
| US5105408A (en) * | 1988-05-12 | 1992-04-14 | Digital Equipment Corporation | Optical head with flying lens |
| US5022018A (en) * | 1989-02-16 | 1991-06-04 | Minnesota Mining And Manufacturing Company | System for applying a perpendicular magnetic field to the illuminated side of a magneto-optic medium |
| EP0390584A2 (en) * | 1989-03-31 | 1990-10-03 | Sharp Kabushiki Kaisha | Photomagnetic composite head |
| US5193082A (en) * | 1989-03-31 | 1993-03-09 | Sharp Kabushiki Kaisha | Optical/magnetic composite head having magnetic and optical heads in one integrated unit |
| US5161134A (en) * | 1989-06-29 | 1992-11-03 | Digital Equipment Corporation | Method for increasing linear bit density in magneto-optical storage media |
| US5255260A (en) * | 1989-07-28 | 1993-10-19 | Matsushita Electric Industrial Co., Ltd. | Optical recording apparatus employing stacked recording media with spiral grooves and floating optical heads |
| JPH0352829U (en) * | 1989-09-22 | 1991-05-22 | ||
| US5197050A (en) * | 1989-10-06 | 1993-03-23 | Fuji Xerox Co., Ltd. | Flying head for a magneto-optical recording drive |
| US5295122A (en) * | 1991-07-09 | 1994-03-15 | Fuji Xerox Co., Ltd. | Flying head of a magneto-optical recording apparatus |
| KR20010022150A (en) * | 1997-07-23 | 2001-03-15 | 추후 | Slider for optical disc data storage system |
| US6574015B1 (en) | 1998-05-19 | 2003-06-03 | Seagate Technology Llc | Optical depolarizer |
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