JPS6025003A - Opto-magnetic recording device - Google Patents

Opto-magnetic recording device

Info

Publication number
JPS6025003A
JPS6025003A JP13249283A JP13249283A JPS6025003A JP S6025003 A JPS6025003 A JP S6025003A JP 13249283 A JP13249283 A JP 13249283A JP 13249283 A JP13249283 A JP 13249283A JP S6025003 A JPS6025003 A JP S6025003A
Authority
JP
Japan
Prior art keywords
spot
recording
laser
shape
recording device
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
Application number
JP13249283A
Other languages
Japanese (ja)
Inventor
Shiro Okamura
岡村 史良
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to JP13249283A priority Critical patent/JPS6025003A/en
Publication of JPS6025003A publication Critical patent/JPS6025003A/en
Pending legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B13/00Recording simultaneously or selectively by methods covered by different main groups among G11B3/00, G11B5/00, G11B7/00 and G11B9/00; Record carriers therefor not otherwise provided for; Reproducing therefrom not otherwise provided for
    • G11B13/04Recording simultaneously or selectively by methods covered by different main groups among G11B3/00, G11B5/00, G11B7/00 and G11B9/00; Record carriers therefor not otherwise provided for; Reproducing therefrom not otherwise provided for magnetically or by magnetisation and optically or by radiation, for changing or sensing optical properties
    • G11B13/045Recording simultaneously or selectively by methods covered by different main groups among G11B3/00, G11B5/00, G11B7/00 and G11B9/00; Record carriers therefor not otherwise provided for; Reproducing therefrom not otherwise provided for magnetically or by magnetisation and optically or by radiation, for changing or sensing optical properties combined recording by magnetic and optic means
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B11/00Recording 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
    • G11B11/10Recording 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
    • G11B11/105Recording 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
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/02Recording, reproducing, or erasing methods; Read, write or erase circuits therefor
    • G11B5/09Digital recording

Abstract

PURPOSE:To cancel the distortion of a spot on a magnetic medium exactly by deforming the spot of a laser beam previously. CONSTITUTION:The shape of the previously distorted spot 20 of a recording laser is deformed as shown by 21 and 22 by the movement of the medium and heat effect. Therefore, rectangular bit recording and high-density recording are attained. They are reproduced sufficiently with a normal magnetic head as a matter of course, but the latter is very suitable to reproduction using a laser beam. The beam 6 of the laser 7 passes through the screen 25 having a lens 4 and a slit 27 in a laser recording system to form a spot 26 on the magnetic surface 1. The shape of the slit 27 is determined in consideration of diffraction so that the spot 26 is formed.

Description

【発明の詳細な説明】 この発明はレーザ類を用いた光磁気記録装置に関する。[Detailed description of the invention] The present invention relates to a magneto-optical recording device using lasers.

このような装置において、レーザビームによる磁性媒体
上のスポットは通常、円、長円、方形的な形をしている
が、熱の伝導現象のため磁性媒体移動速度が大きい程ス
ポットの形状は変形して、凸部が進行方向へ向いた三ケ
月状となる。そこで、直線状間隙のヘッドで再生すると
、出力の減少、混信、帯域幅の低下などの障害が生じる
In such devices, the spot on the magnetic medium caused by the laser beam usually has a circular, elliptical, or rectangular shape, but due to heat conduction phenomena, the shape of the spot deforms as the magnetic medium moves faster. As a result, the protrusion becomes crescent-shaped with the protrusion facing in the direction of travel. Therefore, when playing with a head with a linear gap, problems such as a decrease in output, interference, and a decrease in bandwidth occur.

この発明はこのような欠点のないほぼ方形的記録パタン
の配列した光磁気記録を得゛ることを目的とする。
The object of the present invention is to obtain magneto-optical recording in which a substantially rectangular recording pattern is arranged without such drawbacks.

この目的のため本発明においては、レーザビームのスポ
ットを予め変形しておいて、上記の変歪を丁度打ち消す
ようにすることを要旨とする。
For this purpose, the gist of the present invention is to deform the spot of the laser beam in advance so as to exactly cancel out the distortion described above.

第1図は本発明の適用される光磁気記録装置を示す。1
はCrO2などの磁気テープで、先ず帯磁ヘッド2で一
方向に磁化され、これと逆方向の磁化磁石3の存在下に
信号8て変調されたレーザ7のビーム6でキューリ点近
くまで加熱されて記録が行なわれる発明者出願特願昭5
8−25389号記載の如き方法である。4はレンズで
ある。
FIG. 1 shows a magneto-optical recording device to which the present invention is applied. 1
is a magnetic tape such as CrO2, which is first magnetized in one direction by a magnetic head 2, and heated to near the Curie point by a beam 6 of a laser 7 modulated by a signal 8 in the presence of a magnet 3 magnetized in the opposite direction. Inventor application patent application recorded in 1973
This method is as described in No. 8-25389. 4 is a lens.

第2図は従来の光磁気記録装置の例で、消去ヘッド12
を経た磁性媒体】は信号8で励磁されるヘッドあるいは
コイル10の磁界中でレーザビーム6で加熱される。
FIG. 2 shows an example of a conventional magneto-optical recording device, in which an erasing head 12
The magnetic medium] is heated by a laser beam 6 in the magnetic field of a head or coil 10 excited by a signal 8.

何れにしても、ビームのスポットの形状がたとえ円形で
あっても、進行する媒体のためスポット9の形は変形す
る。第3図15.16はディジタル記録の場合変形した
記録を示す。このような変形した記録から直線状間隙を
持つ通常の磁気ヘッドを使って読み出すと、明らかに出
力の減少、隣接ビットの混信等を生じ、これを避けるた
めにはビット間隔を明ける他なかった。ずなわ”ち記録
密度の低下をきたす。レーザビームを使って読み出す場
合は読出しレーザビームのスポットを15.16のよう
な形とすれば、可能ではあるが、記録の上下端部が近接
し混信を生じ最良動作は期待し難い。
In any case, even if the shape of the beam spot is circular, the shape of the spot 9 is deformed due to the traveling medium. FIG. 3 15.16 shows a modified recording in the case of digital recording. If such a deformed record is read using a normal magnetic head with a linear gap, there will obviously be a decrease in output and interference between adjacent bits, and the only way to avoid this is to widen the bit spacing. When reading using a laser beam, it is possible to set the spot of the reading laser beam in a shape like 15.16, but the upper and lower ends of the recording are close to each other, resulting in a decrease in recording density. Therefore, it is difficult to expect optimal operation.

第4図は第3図の如きスポットによる実効的記録跡の配
列を示し2図示の如くビット間のすぎ間が大きくなって
無駄がある。
FIG. 4 shows the arrangement of effective recording traces by spots as shown in FIG. 3, and as shown in FIG. 2, the gaps between bits are large and wasteful.

第5図は本発明による記録レーザスポットの変歪したも
のを示す。20は予め変歪された記録レーザのスポット
の形を示し、大体第3図15.16と逆向きとなり、こ
のようなスポットが媒体の移動と熱効果によって21.
22のように変形することを示す。従って方形的なビッ
ト記録が並び高密度記録ができることを示す。もちろん
通常の磁気ヘッドによって十分再生が可能であるが、レ
ーザビームによる再生にも後者の場合がずっと好都合で
ある。
FIG. 5 shows a distorted recording laser spot according to the invention. 20 shows the shape of the recording laser spot that has been distorted in advance, and is approximately in the opposite direction to that in FIG.
22 shows the deformation. This shows that rectangular bit recording is arranged and high-density recording is possible. Of course, it is possible to sufficiently reproduce the information using a normal magnetic head, but the latter case is also much more convenient for reproduction using a laser beam.

第6図は本発明によるレーザ記録系を示す。し′二′ザ
1のビーム6はレンズ4、スリット27−を有するつい
立25を経て磁性面lにスポット26を生じる。27の
形は第5図20に相当するスポット26を生じるように
回折を考慮して定める。場合によっては、レンズ屡の曲
面収差を応用して第5図20に近い形のスポット26を
生じることもできる。また、変形レンズや傾けた光軸に
よって類似のスポットを生じてもよい。
FIG. 6 shows a laser recording system according to the invention. The beam 6 from the laser 1 passes through a lens 4 and a stand 25 having a slit 27 to form a spot 26 on the magnetic surface l. The shape of 27 is determined in consideration of diffraction so as to produce a spot 26 corresponding to FIG. 5, 20. In some cases, a spot 26 having a shape similar to that shown in FIG. 5, 20 can be produced by applying the curvature aberration of the lens. Similar spots may also be produced by a deformed lens or a tilted optical axis.

本発明はもちろん磁気ディスク、ドラムその他にも適用
できる。また第1.2図以外の光磁気記録装置にも適用
できる。
The present invention can of course be applied to magnetic disks, drums, and other devices. It can also be applied to magneto-optical recording devices other than those shown in FIG. 1.2.

本発明は上記特定例に限らず種々の変形ができる。The present invention is not limited to the above specific example and can be modified in various ways.

【図面の簡単な説明】[Brief explanation of the drawing]

第1.2図は本発明の適用される光磁気記録装置の例を
示す。第3図は第1.2図の装置における磁化パタンを
示す。第4図は第3図に対応する等価磁化バタンを示す
。第6図は本発明による記録ビームスポットの形を示す
。第6図は第5図のようなスポットを生じる本発明装置
を示す。
FIG. 1.2 shows an example of a magneto-optical recording device to which the present invention is applied. FIG. 3 shows the magnetization pattern in the device of FIG. 1.2. FIG. 4 shows an equivalent magnetization button corresponding to FIG. FIG. 6 shows the shape of the recording beam spot according to the invention. FIG. 6 shows an apparatus according to the invention which produces a spot such as that shown in FIG.

Claims (1)

【特許請求の範囲】[Claims] 移動する磁性媒体と、光ビームと、信号源とを備えた光
磁気記録装置において、該光ビームによる該磁性媒体上
のスポットの形状に磁性媒体の移動と熱的現象によるス
ポットの歪みを補正するよう予め逆の歪みを与えること
を特徴とする光磁気記録装置。
In a magneto-optical recording device including a moving magnetic medium, a light beam, and a signal source, the shape of a spot on the magnetic medium caused by the light beam is corrected for spot distortion caused by movement of the magnetic medium and thermal phenomena. A magneto-optical recording device characterized by applying a reverse distortion in advance.
JP13249283A 1983-07-20 1983-07-20 Opto-magnetic recording device Pending JPS6025003A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13249283A JPS6025003A (en) 1983-07-20 1983-07-20 Opto-magnetic recording device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13249283A JPS6025003A (en) 1983-07-20 1983-07-20 Opto-magnetic recording device

Publications (1)

Publication Number Publication Date
JPS6025003A true JPS6025003A (en) 1985-02-07

Family

ID=15082635

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13249283A Pending JPS6025003A (en) 1983-07-20 1983-07-20 Opto-magnetic recording device

Country Status (1)

Country Link
JP (1) JPS6025003A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6599720B2 (en) 1993-12-01 2003-07-29 Marine Polymer Technologies Methods for making poly-β-1→4-N-acetylglucosamine
US8858964B2 (en) 2010-04-15 2014-10-14 Marine Polymer Technologies, Inc. Anti-bacterial applications of poly-N-acetylglucosamine nanofibers
US8871247B2 (en) 2007-02-19 2014-10-28 Marine Polymer Technologies, Inc. Hemostatic compositions and therapeutic regimens
US10765698B2 (en) 2011-04-15 2020-09-08 Marine Polymer Technologies, Inc. Treatment of disease with poly-N-acetylglucosamine nanofibers

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6599720B2 (en) 1993-12-01 2003-07-29 Marine Polymer Technologies Methods for making poly-β-1→4-N-acetylglucosamine
US6649599B2 (en) 1993-12-01 2003-11-18 Marine Polymer Technologies, Inc. Methods and compositions for poly-β-1-4-N-acetylglucosamine cell therapy system
US6686342B2 (en) 1993-12-01 2004-02-03 Marine Polymer Technologies, Inc. Bicompatible poly-β-1→4-N-acetylglucosamine
US6864245B2 (en) 1993-12-01 2005-03-08 Marine Polymer Technologies, Inc. Biocompatible poly-β-1→4-N-acetylglucosamine
US9139663B2 (en) 2007-02-19 2015-09-22 Marine Polymer Technologies, Inc. Hemostatic compositions and therapeutic regimens
US8871247B2 (en) 2007-02-19 2014-10-28 Marine Polymer Technologies, Inc. Hemostatic compositions and therapeutic regimens
US9139664B2 (en) 2007-02-19 2015-09-22 Marine Polymer Technologies, Inc. Hemostatic compositions and therapeutic regimens
US10383971B2 (en) 2007-02-19 2019-08-20 Marine Polymer Technologies, Inc. Hemostatic compositions and therapeutic regimens
US8858964B2 (en) 2010-04-15 2014-10-14 Marine Polymer Technologies, Inc. Anti-bacterial applications of poly-N-acetylglucosamine nanofibers
US9198928B2 (en) 2010-04-15 2015-12-01 Marine Polymer Technologies, Inc. Anti-bacterial applications of poly-N-acetylglucosamine nanofibers
US9642871B2 (en) 2010-04-15 2017-05-09 Marine Polymer Technologies, Inc. Anti-bacterial applications of poly-N-acetylglucosamine nanofibers
US10206938B2 (en) 2010-04-15 2019-02-19 Marine Polymer Technologies, Inc. Anti-bacterial applications of poly-N-acetylglucosamine nanofibers
US10561677B2 (en) 2010-04-15 2020-02-18 Marine Polymer Technologies, Inc. Anti-bacterial applications of poly-N-acetylglucosamine nanofibers
US10765698B2 (en) 2011-04-15 2020-09-08 Marine Polymer Technologies, Inc. Treatment of disease with poly-N-acetylglucosamine nanofibers

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