JPS6025003A - Opto-magnetic recording device - Google Patents
Opto-magnetic recording deviceInfo
- 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
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B13/00—Recording 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
- G11B13/04—Recording 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
- G11B13/045—Recording 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
-
- 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
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/02—Recording, reproducing, or erasing methods; Read, write or erase circuits therefor
- G11B5/09—Digital recording
Landscapes
- Recording Or Reproducing By Magnetic Means (AREA)
Abstract
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.
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)
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.
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)
| 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 |
-
1983
- 1983-07-20 JP JP13249283A patent/JPS6025003A/en active Pending
Cited By (14)
| 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 |
| US9139664B2 (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 |
| US9139663B2 (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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