JPS5992406A - Photo-magnetic recorder - Google Patents
Photo-magnetic recorderInfo
- Publication number
- JPS5992406A JPS5992406A JP20270682A JP20270682A JPS5992406A JP S5992406 A JPS5992406 A JP S5992406A JP 20270682 A JP20270682 A JP 20270682A JP 20270682 A JP20270682 A JP 20270682A JP S5992406 A JPS5992406 A JP S5992406A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic field
- record
- magnet
- erasion
- recording
- 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
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
この発明は、光磁気ディスク等の記録消去装置に関する
ものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a recording/erasing device for a magneto-optical disk or the like.
従来例の構成とその問題点
光ディスクは、高密度・大容量・高速アクセス可能なメ
モリ媒体として広く研究されている。その応用はオーデ
ィオディスク、ビデオディスク。Conventional configurations and their problems Optical disks have been widely studied as high-density, large-capacity, and high-speed accessible memory media. Its applications are audio discs and video discs.
静止画ファイルディスク、文書ファイルディスクと他方
面にわたっている。The other side includes a still image file disk and a document file disk.
書き換え可能な光ディスクの有力なものとして開発研究
されている光磁気ディスクの消去方法としては、次の２
つの方法がある。■光磁気ディスク全体を、磁場だけを
用いて一括して一方向に磁化して消去する方法と、■レ
ーザー光による加熱と消去磁場との併用によって消去す
る方法である。The following two methods are available for erasing magneto-optical disks, which are being developed and researched as promising rewritable optical disks.
There are two ways. (2) A method in which the entire magneto-optical disk is magnetized and erased in one direction using only a magnetic field, and (2) A method in which the entire magneto-optical disk is erased by a combination of heating with laser light and an erasing magnetic field.
前者の場合、一括消去であるために微小部の部分的な情
報の書き換えは困難であシ、特に編集機能全要求するシ
ステムに用いる場合は不適当である。In the former case, it is difficult to rewrite partial information in minute parts because it is erased all at once, and it is particularly inappropriate when used in a system that requires all editing functions.
後者に関して、消去光学系と記録光学系を一つにする方
法と別個にする方法がある。部品点数を削減し、低コス
ト化を達成するために叫実用上記録と消去光学系が同一
であることが要求される。しかし、この消去光学系と記
録光学系を同一にする具体的な方法はまだ実現されてい
ない。Regarding the latter, there are methods of combining the erasing optical system and the recording optical system and methods of making them separate. In order to reduce the number of parts and achieve cost reduction, it is practically required that the recording and erasing optical systems be the same. However, a concrete method of making the erasing optical system and the recording optical system the same has not yet been realized.
発明の目的
この発明の目的は、任意のす前軸ビットを確実に消去で
き、しかも部品点数の削減、小型化および光学系の調整
の容易化を図シ得る光磁気記録装置を提供することであ
る。OBJECTS OF THE INVENTION An object of the present invention is to provide a magneto-optical recording device that can reliably erase any front axis bit, and that also reduces the number of parts, downsizes, and facilitates adjustment of the optical system. be.
発明の構成
この発明は、光磁気記録媒体にレーザービームを照射す
る記録消去兼用のレーザービーム照射手段と、前記光磁
気記録媒体のレーザービーム照射位置に記録時より大き
い逆磁場を消去時に与える磁場発生手段とを備えたもの
である。Structure of the Invention The present invention provides a laser beam irradiation means for irradiating a laser beam onto a magneto-optical recording medium for both recording and erasing purposes, and a magnetic field generating means for applying a reverse magnetic field larger than that during recording to a laser beam irradiation position of the magneto-optical recording medium during erasing. It is equipped with means.
実施例の説明
この発明の一実施例を第１図ないし第３図に示す。まず
、記録と、レーザー光の熱作用ヲ併用した消去の原理に
つき説明する。記録時は第１図（ａ）に示したように、
レーザー光１を記録薄膜２に照射する。これにより記録
薄膜２が温度上行し、そのために第２図に示したように
、記録薄膜２の保磁力が減少する。その時に記録外部磁
場１１ｅｘ ３と周囲からの反磁場Ｈｉ４が作用して、
磁化反転が起こり記録が行なわれる。DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention is shown in FIGS. 1 to 3. First, the principle of recording and erasing using a combination of thermal action of laser light will be explained. During recording, as shown in Figure 1(a),
A recording thin film 2 is irradiated with a laser beam 1. As a result, the temperature of the recording thin film 2 increases, so that the coercive force of the recording thin film 2 decreases as shown in FIG. At that time, the recording external magnetic field 11ex3 and the demagnetizing field Hi4 from the surroundings act,
Magnetization reversal occurs and recording is performed.
消去時は、第１図（ｂ）に示したように、記録時と逆の
外部磁場Ｈｅｘ’５を印カ１比て元の磁化状態に戻す。At the time of erasing, as shown in FIG. 1(b), an external magnetic field Hex'5 opposite to that at the time of recording is applied to the application force 1 to return the original magnetization state.
したがって、記録ビット径は記録時の薄膜の温度分布と
記録外部磁場Ｈｅｘ ３と反磁場ＨＩ４によって決定す
る。そこで、記録ビットの消去時にその径に応じた磁場
を与え、記録ビットの消し残りを防ぐ必要がある。Therefore, the recording bit diameter is determined by the temperature distribution of the thin film during recording, the recording external magnetic field Hex3, and the demagnetizing field HI4. Therefore, when erasing recorded bits, it is necessary to apply a magnetic field according to the diameter of the recorded bits to prevent the recorded bits from remaining erased.
すなわち、記録ビット径は、第３図に示したように、外
部磁場Ｈｅｘによって変化する。そのため、消去時には
記録ビット径に応じた磁場が必要になる。That is, the recording bit diameter changes depending on the external magnetic field Hex, as shown in FIG. Therefore, during erasing, a magnetic field corresponding to the recorded bit diameter is required.
一レーザーパワー（ピーク値）５ｍＷ、レーザーパルス
幅０１〜１μｓｅｃで記録磁場１５００ｅの時の記録ビ
ットは、同一光学系を用いると、４０’００ｅの消去磁
場を与えると完全に記録ビット’２消すことができ、消
し残りは認められなかった。When the laser power (peak value) is 5 mW, the laser pulse width is 01 to 1 μsec, and the recording magnetic field is 1500 e, the recorded bits can be completely erased by applying an erasing magnetic field of 40'00 e using the same optical system. was completed, and no unerased material was observed.
また、外部磁場を与える装置として、永久磁石を用い記
録時と消去時で回転させて磁場を反転させる。その時に
回転軸を磁石の中心とずらせることによシ、磁場の強さ
を変えることができる。Further, as a device for applying an external magnetic field, a permanent magnet is used and rotated during recording and erasing to reverse the magnetic field. By shifting the axis of rotation from the center of the magnet, the strength of the magnetic field can be changed.
第４図にその光磁気記録装置の具体例を示す。FIG. 4 shows a specific example of the magneto-optical recording device.
回転機構６に固定された光磁気ディスクからなる記録薄
膜７は、レーザービーム照射手段となる光学系８と永久
磁石９により記録と消去が行なわれる。記録時と消去時
では磁場方向は逆であるので回転軸１０により、永久磁
石９が回転し、磁場逆転が行なわれる。この時、回転軸
１ｏは磁石の中心をずらしであるために磁場の強さが変
えられる。A recording thin film 7 made of a magneto-optical disk fixed to a rotating mechanism 6 is recorded and erased by an optical system 8 serving as a laser beam irradiation means and a permanent magnet 9. Since the direction of the magnetic field is opposite during recording and erasing, the permanent magnet 9 is rotated by the rotary shaft 10, and the magnetic field is reversed. At this time, the strength of the magnetic field can be changed because the center of the magnet on the rotation axis 1o is shifted.
第５図は、使用した永久磁石９の端面からの距離による
磁界強度の依存性を表わした。記録薄膜７上で記録時に
１５００ｅ、消去時に４０００ｅ の磁場を得るため
には、記録薄膜７から磁石９の端面オでの距離は記録時
１７ ａｍ 、消去時９゜２闘である。したがって、永
久磁石９の厚みがｌ Ｏｍｍであるので回転軸】０は永
久磁石９の中心から３．９πｍずらせれば要求する磁界
強度を得ることかで゛きた。FIG. 5 shows the dependence of the magnetic field strength on the distance from the end face of the permanent magnet 9 used. In order to obtain a magnetic field of 1500 e during recording and 4000 e upon erasing on the recording thin film 7, the distance from the recording thin film 7 to the end face of the magnet 9 is 17 am during recording and 9°2 during erasing. Therefore, since the thickness of the permanent magnet 9 is lOmm, the required magnetic field strength can be obtained by shifting the rotation axis 0 by 3.9πm from the center of the permanent magnet 9.
コノヨうにして記録消去を行なうため、次の各、利点が
得られる。■記録と消去（（同一の光学系８を用いたの
で大幅な部品の削減と装置の小型化が可能となった。■
記録と消去とに同一の光学系８を用いたので、光学系８
の調整が容易になり、磁場の強弱を変えるだけで記録ビ
ットの消し残りを防ぐことができる。なお、■、■の利
点は、記録光学系と消去光学系の一部を共用することに
よっても得られる。■光学系８と分離した永久磁石９に
より磁場を与えるために、光学系８が軽くなシ、その移
動速度が速められ、情報の検索時間の短縮が可能となっ
たっ■永久磁石９の中心から回転軸１０をずらしたこと
により、容易に要求される記録磁場と消去磁場を得られ
るようになった。Since records are erased in this manner, the following advantages can be obtained. ■Recording and erasing ((Since the same optical system 8 is used, it is possible to significantly reduce the number of parts and downsize the device.■
Since the same optical system 8 was used for recording and erasing, the optical system 8
This makes it easy to adjust the magnetic field, and it is possible to prevent unerased recorded bits by simply changing the strength of the magnetic field. Note that the advantages (1) and (2) can also be obtained by sharing part of the recording optical system and the erasing optical system. ■Since the magnetic field is applied by the permanent magnet 9 separated from the optical system 8, the optical system 8 is light, its movement speed is increased, and information retrieval time can be shortened.■From the center of the permanent magnet 9 By shifting the rotation axis 10, the required recording magnetic field and erasing magnetic field can now be easily obtained.
発明の効果
この発明は、任意の情報ピッＨ−確実に消去でき、しか
も部品点数の削減、小型化およびレーザービーム照射手
段の調整の容易化が図ｉ］るという効果がある。Effects of the Invention The present invention has the advantage that any information can be reliably erased, the number of parts can be reduced, the size can be reduced, and the adjustment of the laser beam irradiation means can be made easier.
第１図（ａ） 、 （ｂ）はそれぞれ光磁気記録・消去
の原理を示す模式図、第２図はその使用した薄膜の保磁
力の温度依存性を表わす特性図、Ｍ３図は同じくその記
録ビット径の外部記録磁場依存性を表ゎした特性図、第
４図はこの発明の一実施例の要部構成図、第５図はその
磁石の磁界強度の距離依存性金示した特性図である。
１・・・レーザー光、２・・・記録薄膜、３・・外部記
録磁場、４・・・周囲からの反磁場、５・外部消去磁場
、６・・回転機構、７・・記録薄膜、８ 光学系、９・
・・−永久磁石、１０・回転軸
第１図
□外 郭 記 録砿 鼻 （にＯｅ）
第３図
□〃龜 石 ｘｉ 力＼ ら の 呂＝
タ旙第５図Figures 1 (a) and (b) are schematic diagrams showing the principle of magneto-optical recording and erasing, respectively. Figure 2 is a characteristic diagram showing the temperature dependence of the coercive force of the thin film used. Figure M3 is also a diagram showing the recording. A characteristic diagram showing the dependence of the bit diameter on the external recording magnetic field, Fig. 4 is a diagram showing the main part of an embodiment of the present invention, and Fig. 5 is a characteristic diagram showing the distance dependence of the magnetic field strength of the magnet. be. DESCRIPTION OF SYMBOLS 1... Laser light, 2... Recording thin film, 3... External recording magnetic field, 4... Demagnetizing field from surroundings, 5... External erasing magnetic field, 6... Rotating mechanism, 7... Recording thin film, 8 Optical system, 9.
・・・-Permanent magnet, 10・Rotation axis Fig. 1 □ Outer shell record 翿 ノ (ni Oe) Fig. 3 □
Figure 5
Claims (2)
−消去兼用のレーザービーム照射手段と、前記光磁気記
録媒体のレーザービーム照射位置に記録時より大きい逆
磁場全消去時に与える磁場発生手段とを備えた光磁気記
録装置。(1) A laser beam irradiation unit for both recording and erasing that irradiates a laser beam onto a magneto-optical recording medium, and a magnetic field generating unit that applies a reverse magnetic field larger than that during recording to the laser beam irradiation position of the magneto-optical recording medium during complete erasing. Magneto-optical recording device equipped with.
挾んで前記レーザービーム照射手段に対向配置こされ、
中心をずらせた回転軸で支持さ１１た永久磁石である特
許請求の範囲第（１）項記載の光磁気記録装置。(2) the magnetic field generating means is arranged opposite to the laser beam irradiation means with the magneto-optical recording medium in between;
The magneto-optical recording device according to claim 1, wherein the magneto-optical recording device is a permanent magnet supported by a rotating shaft whose center is shifted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20270682A JPS5992406A (en) | 1982-11-17 | 1982-11-17 | Photo-magnetic recorder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20270682A JPS5992406A (en) | 1982-11-17 | 1982-11-17 | Photo-magnetic recorder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5992406A true JPS5992406A (en) | 1984-05-28 |
| JPH0379761B2 JPH0379761B2 (en) | 1991-12-19 |
Family
ID=16461800
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20270682A Granted JPS5992406A (en) | 1982-11-17 | 1982-11-17 | Photo-magnetic recorder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5992406A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59142760A (en) * | 1983-02-02 | 1984-08-16 | Canon Inc | Optical information recording device |
| US4748606A (en) * | 1985-04-29 | 1988-05-31 | Sony Corporation | External magnetic field inverting apparatus for magneto-optical disc apparatus |
| WO1990003643A1 (en) * | 1988-09-20 | 1990-04-05 | Hewlett-Packard Company | Bias field switching system for magneto-optic disk drive |
| US5216643A (en) * | 1988-09-20 | 1993-06-01 | Hewlett-Packard Company | Rotary arm and optical head for a magneto-optic disk drive |
| US5229983A (en) * | 1989-12-28 | 1993-07-20 | Matsushita Electric Industrial Co., Ltd. | Bias magnetic field generating apparatus for magneto-optical recording and reproducing system |
| EP0566989A2 (en) * | 1992-04-24 | 1993-10-27 | Sony Corporation | Magneto-optical disc apparatus |
| US5345431A (en) * | 1992-09-14 | 1994-09-06 | Hewlett-Packard Company | Write and erase assembly for magneto-optic drive apparatus |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57176505A (en) * | 1981-04-23 | 1982-10-29 | Olympus Optical Co Ltd | Bias magnetic field applying system |
-
1982
- 1982-11-17 JP JP20270682A patent/JPS5992406A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57176505A (en) * | 1981-04-23 | 1982-10-29 | Olympus Optical Co Ltd | Bias magnetic field applying system |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59142760A (en) * | 1983-02-02 | 1984-08-16 | Canon Inc | Optical information recording device |
| JPH0522304B2 (en) * | 1983-02-02 | 1993-03-29 | Canon Kk | |
| US4748606A (en) * | 1985-04-29 | 1988-05-31 | Sony Corporation | External magnetic field inverting apparatus for magneto-optical disc apparatus |
| WO1990003643A1 (en) * | 1988-09-20 | 1990-04-05 | Hewlett-Packard Company | Bias field switching system for magneto-optic disk drive |
| US4977549A (en) * | 1988-09-20 | 1990-12-11 | Hewlett-Packard Company | Write and erase magnetic bias field switching system for a magneto-optic disk drive |
| US5216643A (en) * | 1988-09-20 | 1993-06-01 | Hewlett-Packard Company | Rotary arm and optical head for a magneto-optic disk drive |
| US5229983A (en) * | 1989-12-28 | 1993-07-20 | Matsushita Electric Industrial Co., Ltd. | Bias magnetic field generating apparatus for magneto-optical recording and reproducing system |
| EP0566989A2 (en) * | 1992-04-24 | 1993-10-27 | Sony Corporation | Magneto-optical disc apparatus |
| EP0566989A3 (en) * | 1992-04-24 | 1994-11-23 | Sony Corp | Magneto-optical disc apparatus. |
| US5345431A (en) * | 1992-09-14 | 1994-09-06 | Hewlett-Packard Company | Write and erase assembly for magneto-optic drive apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0379761B2 (en) | 1991-12-19 |
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