JPS59217250A - Recording, reproducing, and erasing device for photomagnetic disk - Google Patents
Recording, reproducing, and erasing device for photomagnetic diskInfo
- Publication number
- JPS59217250A JPS59217250A JP9300283A JP9300283A JPS59217250A JP S59217250 A JPS59217250 A JP S59217250A JP 9300283 A JP9300283 A JP 9300283A JP 9300283 A JP9300283 A JP 9300283A JP S59217250 A JPS59217250 A JP S59217250A
- Authority
- JP
- Japan
- Prior art keywords
- recording
- erasure
- beam splitter
- erasing
- reproduction
- 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.)
- Granted
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
- G11B11/10532—Heads
-
- 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
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
本発明は、光磁気ディスクの記録時に、以前に情報が記
録されていた箇／ｙｊの消去を行いながら記録する光磁
気ディスク記録再生消去装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a magneto-optical disk recording, reproducing and erasing device that performs recording while erasing previously recorded information on a magneto-optical disk. It is.
従来例の構成とその問題点
光磁気ディスクは、記録情報の書き換えが可能な光ディ
スクで、ビデオディスク、オーディオディスクへの利用
、きらには文書ファイル、コンピュータ用データファイ
ルへの幅広い利用が考えられる。従来、光磁気ディスク
における記録情報の消去方法として、次の様なものが考
えられていた。Conventional Structures and Problems Magneto-optical disks are optical disks on which recorded information can be rewritten, and can be used in a wide range of applications such as video disks, audio disks, document files, and computer data files. Conventionally, the following methods have been considered as methods for erasing recorded information on magneto-optical disks.
すなわち第１の方法は、強力な磁場のみを利用した方法
で、この方法は、部分的な情報の消去が極めて難しいと
いう問題があった。第２の方法は、弱磁場の印加と同時
にレーザ光を照射する方法で、この方法においては、消
去光学系を一般的に記録光学系と共用するために、記録
と消去とを同時に行うことができないという問題がめっ
た。That is, the first method uses only a strong magnetic field, and this method has the problem that it is extremely difficult to erase partial information. The second method is to apply a weak magnetic field and irradiate laser light at the same time. In this method, since the erasing optical system is generally used in common with the recording optical system, recording and erasing can be performed at the same time. The problem was that I couldn't do it.
発明の目的
本発明は上記従来の欠点を解消するもので、情報の部分
的消去を可能にし、消去と同時に記録を行うことができ
る、つまシディスク上の不要な情報のみを消去しながら
、新たな情報を記録できる光磁気ディスク記録再生消去
装置を提供することを目的とする。OBJECT OF THE INVENTION The present invention solves the above-mentioned conventional drawbacks, and enables partial erasure of information and recording at the same time as erasing, while erasing only unnecessary information on the disk. An object of the present invention is to provide a magneto-optical disk recording/reproducing/erasing device that can record information of various types.
発明の構成
上記目的を達成するため、本発明の記録再生消去装置は
、光磁気ディスクに情報の記録を行う記録光学系と、光
磁気ディスクに記録された情報の再生・消去を行う再生
・消去光学系との２系統の光学系を備えた構成である。Structure of the Invention In order to achieve the above object, the recording/reproducing/erasing device of the present invention includes a recording optical system for recording information on a magneto-optical disk, and a reproducing/erasing system for reproducing/erasing information recorded on the magneto-optical disk. The configuration includes two optical systems: the optical system and the optical system.
実施例の説明
以下、本発明の一実施例について、図面に基づいて説明
する。DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.
第１図は光ｆａ気ディスク記録再生消去装置の構成図で
、図面左半分が記録光学系、右半分が再生・消去光学系
である。第１図において、（１）は光磁気ディスク、（
２）は記録用半導体レーザ発生装置、（３）はコリメー
トレンズ、（４）はビーム整形プリズム、λ
（５１は偏光ビームスプリッタ、（６）は−板、（７）
は対物レンズ、（８） ｉｊ集束レンズ、（９）は受光
器、００は再生・消去用半導体レーザ発生装置、０店は
コリメートレンズ、（２）はビーム整形プリズム、０は
偏光ビームスプリッタ、０４は対物レンズ、ａｆＪは偏
光ビームスプリッタ、ａＱは集束レンズ、Ｑ力は偏光プ
リズム、（ト）は受光器、Ｉａ＋＋ｒは集束レンズ、に
）は受光器、に）は記録磁場印加装置、伜は消去磁場印
加装置である。FIG. 1 is a block diagram of an optical fa disc recording/reproducing/erasing device, in which the left half of the figure is a recording optical system, and the right half is a reproducing/erasing optical system. In Figure 1, (1) is a magneto-optical disk, (
2) is a recording semiconductor laser generator, (3) is a collimating lens, (4) is a beam shaping prism, λ (51 is a polarizing beam splitter, (6) is a negative plate, (7)
is an objective lens, (8) is a focusing lens, (9) is a light receiver, 00 is a semiconductor laser generator for reproducing and erasing, 0 is a collimating lens, (2) is a beam shaping prism, 0 is a polarizing beam splitter, 04 is the objective lens, afJ is the polarizing beam splitter, aQ is the focusing lens, Q force is the polarizing prism, (g) is the light receiver, Ia++r is the focusing lens, ni) is the light receiver, ni) is the recording magnetic field applying device, and 传 is the erasing device. This is a magnetic field application device.
記録用半導体レーザ発生装置（２）からのレーザ光は、
コリメートレンズ（３）、ビーム整形プリズム（４）、
λ
偏光ビームスプリッタ（５＋、７板（６）、及び対物レ
ンズ（７）を通って光磁気ディスク（１）に入射し、こ
の光磁気ディスク（１）で反射され１３反射光は、対物
レンλ
ズ（７）及び７板（−を通って偏光ビームスプリッタ（
５］で反射され、集束レンズ（８）を通って受光器（９
）に入射する。The laser light from the recording semiconductor laser generator (2) is
Collimating lens (3), beam shaping prism (4),
λ The light enters the magneto-optical disk (1) through the polarizing beam splitter (5+, 7 plate (6), and objective lens (7), is reflected by the magneto-optical disk (1), and the reflected light 13 passes through the objective lens λ (7) and the 7th plate (-) to the polarizing beam splitter (
5] and passes through the focusing lens (8) to the receiver (9).
).
また再生・消去用半導体レーザ発生装置０１からのレー
ザ光は、コリメートレンズａυ、ビーム整形プリズム（
２）、偏光ビームスグリツタ（至）、及び対物レンズ（
ロ）を通って光磁気ディスク（１）に入射し１この光磁
気ディスク（１）で反射された反射光は、対物レンズＱ
楡を通って偏光ビー上スプリッタ（至）で反射され、偏
光ビームスプリッタＱＱに入射する。この入射光の一部
は偏光ビームスプリッタ（ト）から集束レンズαＱ及び
偏光プリズムＱのを通って受光器（至）に入射され、残
部は集束レンズ鵠を通って受光器（ホ）に入射される。In addition, the laser light from the reproducing/erasing semiconductor laser generator 01 is transmitted through a collimating lens aυ, a beam shaping prism (
2), polarizing beam sinter (to), and objective lens (
The reflected light that is incident on the magneto-optical disk (1) through the magneto-optical disk (1) and reflected by the magneto-optical disk (1) is transmitted through the objective lens Q.
It passes through the elm, is reflected by the polarizing beam splitter (to), and enters the polarizing beam splitter QQ. A part of this incident light passes from the polarizing beam splitter (G), passes through the focusing lens αQ and the polarizing prism Q, and enters the photoreceiver (E), and the remainder passes through the focusing lens (E) and enters the photoreceiver (E). Ru.
なお受光器（ト）はメイン信号を得るためのものであシ
、受光器（２）はフォーカス制−などを行うためのもの
である。Note that the photoreceiver (g) is for obtaining the main signal, and the photoreceiver (2) is for performing focus control and the like.
記録用半導体レーザ発生装置（２）と再生・消去用半導
体レーザ発生装置００とを同一出力のものを用いた場合
、記録系の偏光ビームスプリッタ（５）は光源からの光
をほぼ１００チ透過する特性を持つのに対して、再生・
消去系では信号の関係で７板を用いることができないこ
とから、偏光ビームスプリッタａ３は透過率と反射率と
の比がほぼ１：１であるため、ディスク投入パワーは、
記録系に比較して、再生・消去系では約半分に減少する
。また記録時に対して、消去時のレーザパワーは半分で
あるので１消去時には光磁気ディスク（１）の薄膜の温
度がキュリ一点まで達しないが、第２図に示す様に、保
磁力は温度上昇にょ夛減少するため１外部印加磁場を消
去時には記録時よシも大きクシ）磁化反転するに充分の
磁場を与えれば消去可能である。When the recording semiconductor laser generator (2) and the reproducing/erasing semiconductor laser generator 00 have the same output, the polarizing beam splitter (5) of the recording system transmits approximately 100 beams of light from the light source. Regeneration and
In the erasing system, it is not possible to use 7 plates due to signal issues, and since the polarizing beam splitter a3 has a ratio of transmittance to reflectance of approximately 1:1, the disk input power is
Compared to the recording system, it is reduced to about half in the reproduction/erasing system. Also, since the laser power during erasing is half of that during recording, the temperature of the thin film of the magneto-optical disk (1) does not reach the single Curie point during one erasure, but as shown in Figure 2, the coercive force increases with temperature. Erasing is possible by applying a magnetic field sufficient to reverse the magnetization (the externally applied magnetic field is larger during erasing than during recording).
そこで、記録条件を、ディスク投入レーザパワ＝ ８ｍ
Ｗ％外部印加磁場１２０ｏｅとし、消去条件を、ディス
ク投入レーザパワー４ｍＷ 、外部印加磁場６００ ｏ
ｅとして、室温での保磁力１ ｋｏｅの光磁気ディスク
を用い１ディスク回転数を１８０Ｏｒｐｍとじて実験を
行った結果、記録情報の記録・再生・消去を良好に行う
ことができた。Therefore, the recording conditions were as follows: disk input laser power = 8 m
W% Externally applied magnetic field is 120oE, and the erasing conditions are: disk input laser power 4mW, externally applied magnetic field 600oE.
As a result of conducting an experiment using a magneto-optical disk with a coercive force of 1 koe at room temperature and setting the number of revolutions of each disk to 180 rpm as e, recording, reproducing, and erasing of recorded information could be performed satisfactorily.
発明の詳細
な説明したように本発明によれば１不要情報のみの部分
的消去が可能であ夛、シかも古い記録情報の消去を行い
ながら、新しい情報の記録を行い得る。As described in detail, according to the present invention, only unnecessary information can be partially erased, and new information can be recorded while erasing old recorded information.
第１図は本発明の一実施例における光磁気ディスク記録
再生消去装置の全体構成図１第２図は光磁気ディスクの
垂直磁性薄膜の保磁力の温度依存性の説明図である。
（１）・・・光磁気ディスク、（２）・・・記録用半導
体レーザ発生装置、（３）・・・コリメートレンズ、（
４）・・・ビーム整人
形プリズム、（５し・偏光ビームスプリッタ、（ｂし・
７＆、（７）・・・対物レンズ、（８）・・・集束レン
ズ、（９）・・・受光器、θＯ・・・再生・消去用半導
体レーザ、αル・・・コリメートレンズ、亜・・・ビー
ム整形プリズム、（至）・・・偏光ビームスプリッタ、
Ｏ→・・・対物レンズ、０１・・・偏光と−ムスプリツ
タ、００・・・集束レンズ、ｏ７）・・・偏光ブリズム
、（ト）・・・受光器、■・・・集束レンズ、に）・・
・受光器、（２）・・・記録磁場印加装置、（２）・・
・消去磁場印加装置代理人 森本義弘FIG. 1 is an overall configuration of a magneto-optical disk recording/reproducing/erasing device according to an embodiment of the present invention. FIG. 2 is an explanatory diagram of the temperature dependence of the coercive force of a perpendicular magnetic thin film of a magneto-optical disk. (1)...Magneto-optical disk, (2)...Semiconductor laser generator for recording, (3)...Collimating lens, (
4)...Beam shaping prism, (5shi・polarizing beam splitter, (bshi・
7&, (7)...Objective lens, (8)...Focusing lens, (9)...Photodetector, θO...Semiconductor laser for reproducing/erasing, αL...Collimating lens, sub- ...Beam shaping prism, (to)...Polarizing beam splitter,
O→...Objective lens, 01...Polarized light and -muscle splitter, 00...Focusing lens, o7)...Polarizing prism, (G)...Photodetector, ■...Focusing lens, ni)・・・
・Photoreceiver, (2)...Recording magnetic field applying device, (2)...
・Erase magnetic field application device agent Yoshihiro Morimoto
Claims (1)
光磁気ディスクに記録された情報の再生・消去を行う再
生・消去光学系との２系統の、光学系を備えた光磁気デ
ィスク記録再生消去装置・1. A recording optical system that records information on a magneto-optical disk;
A magneto-optical disk recording/reproducing/erasing device equipped with two optical systems: a reproducing/erasing optical system for reproducing/erasing information recorded on a magneto-optical disk;
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9300283A JPS59217250A (en) | 1983-05-25 | 1983-05-25 | Recording, reproducing, and erasing device for photomagnetic disk |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9300283A JPS59217250A (en) | 1983-05-25 | 1983-05-25 | Recording, reproducing, and erasing device for photomagnetic disk |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59217250A true JPS59217250A (en) | 1984-12-07 |
| JPH0520819B2 JPH0520819B2 (en) | 1993-03-22 |
Family
ID=14070163
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9300283A Granted JPS59217250A (en) | 1983-05-25 | 1983-05-25 | Recording, reproducing, and erasing device for photomagnetic disk |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59217250A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6192460A (en) * | 1984-10-12 | 1986-05-10 | Toshiba Corp | Optical information recording device |
| JPS61153875A (en) * | 1984-12-27 | 1986-07-12 | Canon Inc | Optical information recording and reproducing device |
| JPS62157348A (en) * | 1985-12-28 | 1987-07-13 | Nec Home Electronics Ltd | Photomagnetic disk player |
| EP0280548A2 (en) * | 1987-02-27 | 1988-08-31 | Matsushita Electric Industrial Co., Ltd. | Erasable optical disk and optical information recording/reproduction apparatus |
| US4841502A (en) * | 1985-06-14 | 1989-06-20 | Kabushiki Kaisha Toshiba | Information recording system and reproducing for recording and reproducing information on a magneto-optical disk |
| JPH07176101A (en) * | 1994-12-26 | 1995-07-14 | Hitachi Ltd | Magneto-optical storing method and device therefor |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59117703A (en) * | 1982-12-25 | 1984-07-07 | Fujitsu Ltd | Photomagnetic disc device |
| JPS59221850A (en) * | 1983-05-23 | 1984-12-13 | ゼロツクス・コ−ポレ−シヨン | Writing, errasing and reading apparatus for magnetooptical recording medium |
-
1983
- 1983-05-25 JP JP9300283A patent/JPS59217250A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59117703A (en) * | 1982-12-25 | 1984-07-07 | Fujitsu Ltd | Photomagnetic disc device |
| JPS59221850A (en) * | 1983-05-23 | 1984-12-13 | ゼロツクス・コ−ポレ−シヨン | Writing, errasing and reading apparatus for magnetooptical recording medium |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6192460A (en) * | 1984-10-12 | 1986-05-10 | Toshiba Corp | Optical information recording device |
| JPS61153875A (en) * | 1984-12-27 | 1986-07-12 | Canon Inc | Optical information recording and reproducing device |
| US4841502A (en) * | 1985-06-14 | 1989-06-20 | Kabushiki Kaisha Toshiba | Information recording system and reproducing for recording and reproducing information on a magneto-optical disk |
| JPS62157348A (en) * | 1985-12-28 | 1987-07-13 | Nec Home Electronics Ltd | Photomagnetic disk player |
| EP0280548A2 (en) * | 1987-02-27 | 1988-08-31 | Matsushita Electric Industrial Co., Ltd. | Erasable optical disk and optical information recording/reproduction apparatus |
| JPH07176101A (en) * | 1994-12-26 | 1995-07-14 | Hitachi Ltd | Magneto-optical storing method and device therefor |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0520819B2 (en) | 1993-03-22 |
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