JPS62214538A - Method and device for photomagnetic recording and carrying body - Google Patents
Method and device for photomagnetic recording and carrying bodyInfo
- Publication number
- JPS62214538A JPS62214538A JP5502286A JP5502286A JPS62214538A JP S62214538 A JPS62214538 A JP S62214538A JP 5502286 A JP5502286 A JP 5502286A JP 5502286 A JP5502286 A JP 5502286A JP S62214538 A JPS62214538 A JP S62214538A
- Authority
- JP
- Japan
- Prior art keywords
- recording
- magneto
- optical recording
- layer
- layers
- 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
- 238000000034 method Methods 0.000 title claims description 7
- 239000000463 material Substances 0.000 claims abstract description 19
- 125000006850 spacer group Chemical group 0.000 claims abstract description 9
- 239000000758 substrate Substances 0.000 claims abstract description 6
- 230000005415 magnetization Effects 0.000 abstract description 4
- 230000001678 irradiating effect Effects 0.000 abstract description 2
- 238000010030 laminating Methods 0.000 abstract 2
- 230000005540 biological transmission Effects 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 55
- 230000031700 light absorption Effects 0.000 description 9
- 230000003287 optical effect Effects 0.000 description 7
- 239000002223 garnet Substances 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 4
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 229910052733 gallium Inorganic materials 0.000 description 3
- 229910017052 cobalt Inorganic materials 0.000 description 2
- 239000010941 cobalt Substances 0.000 description 2
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000005381 magnetic domain Effects 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 239000011241 protective layer Substances 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 230000005374 Kerr effect Effects 0.000 description 1
- 229910016629 MnBi Inorganic materials 0.000 description 1
- 229910000808 amorphous metal alloy Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- -1 for example Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229910000765 intermetallic Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- AJCDFVKYMIUXCR-UHFFFAOYSA-N oxobarium;oxo(oxoferriooxy)iron Chemical compound [Ba]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O AJCDFVKYMIUXCR-UHFFFAOYSA-N 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔概 要〕
光磁気記録材料層を複数層積み重ねて高密度記録を可能
にする。[Detailed Description of the Invention] [Summary] A plurality of layers of magneto-optical recording material are stacked to enable high-density recording.
本発明は光磁気記録方法、装置および担体に係り、特に
、記録層を複数層積み重ねた多層記録方法、装置および
担体に関する。The present invention relates to a magneto-optical recording method, device, and carrier, and particularly relates to a multilayer recording method, device, and carrier in which a plurality of recording layers are stacked.
従来、光磁気記録媒体としては主にＭｎＢ ｉのような
金属間化合物あるいはＴｂＦｅのような非晶質金属合金
が用いられ、基板上に光磁気記録媒体層およびその記録
媒体層を挟持する保８１膜を形成して構成されている。Conventionally, as magneto-optical recording media, intermetallic compounds such as MnBi or amorphous metal alloys such as TbFe have been mainly used. It is constructed by forming a membrane.
記録は全面を一方向に磁化した後レーザービームを集光
して反対方向に磁化した磁区を選択的に形成することに
よって行なう。こうして記録された情報の読み出しは上
記の記録媒体では光吸収が大きいので一般にカー効果を
用いた反射モードで行なわれる。Recording is performed by magnetizing the entire surface in one direction and then focusing a laser beam to selectively form magnetic domains magnetized in the opposite direction. The information recorded in this manner is generally read out in a reflection mode using the Kerr effect, since the above-mentioned recording medium has high light absorption.
すなわち、記録媒体の磁化の向きに対応して反射光の偏
光状態が変化する（偏光角が一方向に回転する）現象を
利用して情報を再生する。That is, information is reproduced by utilizing the phenomenon that the polarization state of reflected light changes (the polarization angle rotates in one direction) in accordance with the direction of magnetization of the recording medium.
上記のような記録担体および記録方法では、光記録の１
ビツト（磁区）の大きさはレーザービームのスポット径
で決められてしまい、そのため、上記のような光吸収の
大きな記録媒体を用いる場合には、現状の記録密度（５
Ｘ１０”ビット／ｃＪ）を大幅に越えることはできない
と考えられる。In the record carrier and recording method described above, one of the optical recording
The size of the bit (magnetic domain) is determined by the spot diameter of the laser beam, so when using a recording medium with high light absorption as described above, the current recording density (5
It is considered that it is not possible to significantly exceed X10'' bits/cJ).
〔問題点を解決するための手段および作用］本発明は、
上記問題点を解決するために、記録担体に複数層の光磁
気記録材料層を積層して形成し、その光磁気記録材料層
の夫々に独立に光磁気記録を行なうことによって記録密
度の増大を図るものである。[Means and effects for solving the problems] The present invention has the following features:
In order to solve the above problems, the recording density can be increased by stacking multiple layers of magneto-optical recording material on a record carrier and performing magneto-optical recording independently on each layer of the magneto-optical recording material. This is what we aim to do.
例えば、ビスマス置換磁性ガーネットなどの酸化物光磁
気材料は可視から近赤外の光に比較的透明であるので、
このような記録媒体を複数層積み重ねれば、それらの各
層にそれぞれ独立に情報を記録することが可能である。For example, oxide magneto-optical materials such as bismuth-substituted magnetic garnet are relatively transparent to visible to near-infrared light;
By stacking a plurality of layers of such recording media, it is possible to record information independently on each layer.
第１図はこの目的のために構成した多層光磁気記録媒体
の例である。FIG. 1 shows an example of a multilayer magneto-optical recording medium constructed for this purpose.
基板１０上に半透明の光磁気記録材料層１．２゜・・・
５を透明スペーサ［６、７、・・・９を狭んで５層積み
重ねて構成されている。この透明スペーサ層６〜９の厚
みが数μｍもあれば、入射光１２ 、１３を特定の記録
層上にのみ集光でき、その特定の記録層以外の記録層で
は入射光の径が十分に大きくなる。そのため、記録時に
は他の記録層に書き込むためにはパワーが不足し、また
、再生時には、他の記録層の情報は全体として相殺され
て読み出されることはない。こうして、本発明によれば
、多層の光磁気記録方法が提供される。この光磁気記録
は、上記に明らかな如く、情報の書き込み、消去および
読み出しのすべての態様を含むものであり、またその各
態様単独の場合も本発明でいう広義の光磁気記録の概念
に含まれるものである。A translucent magneto-optical recording material layer 1.2° on the substrate 10...
5 with transparent spacers [6, 7, . . . 9 are stacked in 5 layers. If the thickness of the transparent spacer layers 6 to 9 is several μm, the incident light beams 12 and 13 can be focused only on a specific recording layer, and the diameter of the incident light is sufficient for recording layers other than that specific recording layer. growing. Therefore, during recording, there is insufficient power to write to other recording layers, and during reproduction, information on other recording layers is canceled out as a whole and is not read. Thus, according to the present invention, a multilayer magneto-optical recording method is provided. As is clear from the above, this magneto-optical recording includes all aspects of writing, erasing and reading information, and each aspect alone is also included in the concept of magneto-optical recording in the broad sense of the present invention. It is something that can be done.
本発明は、また、この多層光磁気記録を行なうための装
置にも係る。この装置は、多層光磁気記録層を有する記
録担体を所定の位置にセットでき、そのセットされた記
録担体の光磁気記録層の夫々の層に集光しうる光学系を
具備するものである。The invention also relates to an apparatus for performing this multilayer magneto-optical recording. This device is capable of setting a record carrier having a multi-layered magneto-optical recording layer at a predetermined position, and is equipped with an optical system capable of focusing light on each of the magneto-optical recording layers of the set record carrier.
そして、情報の書き込み、消去、読み出しの各態様に応
じて、異なる光学系あるいはその他の付属装置、例えば
、磁気装置、電気回路等を有している。このような装置
の構成は、記録担体の複数層の記録層の夫々に記録（書
き込み、消去、読み出し）を行なうことができる点を除
けば、従来公知の光磁気記録用の装置と基本的に同じで
よい。It has different optical systems or other accessory devices, such as magnetic devices, electric circuits, etc., depending on the manner of writing, erasing, and reading information. The configuration of such a device is basically the same as that of conventionally known magneto-optical recording devices, except that recording (writing, erasing, and reading) can be performed on each of the multiple recording layers of the record carrier. The same is fine.
本発明は、さらに、この多層光磁気記録に用いる光磁気
記録担体に係る。この記録担体は、上記の如く、半透明
の光磁気記録材料層を透明スペーサ層を狭んで複数層積
み重ねて構成する。光磁気記録材料層は光磁気記録がで
きかつ光を透過し得るものであればよい。スペーサ層も
基本的には透光性であればよい。The present invention further relates to a magneto-optical record carrier used for this multilayer magneto-optical recording. As described above, this record carrier is constructed by stacking a plurality of translucent magneto-optical recording material layers with a transparent spacer layer between them. The magneto-optical recording material layer may be any material as long as it can perform magneto-optical recording and transmit light. Basically, the spacer layer may also be transparent as long as it is transparent.
第１図は、前記のように、本発明による多層光磁気記録
担体の例を示す。この例において、例えば、基板１１に
厚さ約１ ａｍのカドリニウムガリウムガーネット（Ｇ
ＧＧ）結晶あるいはガラスを用い、光磁気記録材料層１
．２．・・・５をビスマス置換ガーネットＢｉ、Ｙｚ−
ｘＧａｙＣｏＪｅｓ−（ｙ＋ｚｌｏＩ２で構成し、厚さ
約０．５μｍとし、そしてスペーサ層６゜７・・・９を
二酸化シリコンなどの透明誘電体で構成し、厚さ５μｍ
とし、最後に二酸化シリコンなどで保護層１０を形成す
る。これらの層１〜１０の形成は、スパッタリングとそ
れに次ぐ熱処理によって可能である。FIG. 1, as mentioned above, shows an example of a multilayer magneto-optical record carrier according to the invention. In this example, for example, the substrate 11 is coated with cadrinium gallium garnet (G
GG) Using crystal or glass, magneto-optical recording material layer 1
．． 2. ...5 is bismuth-substituted garnet Bi, Yz-
xGayCoJes-(consisting of y+zloI2, with a thickness of approximately 0.5 μm, and spacer layers 6°7...9 consisting of a transparent dielectric material such as silicon dioxide, with a thickness of 5 μm)
Finally, a protective layer 10 is formed using silicon dioxide or the like. Formation of these layers 1 to 10 is possible by sputtering followed by heat treatment.
こうして、多層光磁気記録担体が提供される。A multilayer magneto-optical record carrier is thus provided.
しかし、ここで、このような記録担体を同一の同吸収を
持つ記録媒体から構成し、かつ単一の光源を用いること
には次のような問題がある。すなわち、記録用のレーザ
ービームは各記録層で吸収を受け、次第に減衰するので
、第１図において、レーザービーム１２ 、１３が第１
記録層ｌから第５記録層５まで光が届き、かつ第５記録
層５で記録が可能なパワーを有するとすれば、この光源
を用いて第１記録Ｎ１に記録するとパワーは過剰になる
。However, there are the following problems in constructing such a record carrier from recording media having the same absorption and using a single light source. That is, since the recording laser beam is absorbed in each recording layer and gradually attenuates, in FIG.
If light reaches the fifth recording layer 5 from the recording layer 1 and has a power that allows recording in the fifth recording layer 5, the power will be excessive if this light source is used to record on the first recording N1.
記録層に過剰なパワーを投入すると、記録ビットが大き
くなりすぎたり、ビット形状が悪化したり、さらには記
録層が損傷する不都合がある。この問題を解決するため
には、各記録層の光吸収率が異なればよい。すなわち、
第１記録層１では光吸収が最も小さく、順次、光吸収が
大きくなって、第５記録層５では最も大きな光吸収を持
つように構成し、各記録層の光吸収を適当にすれば、ど
の記録層にも適切な記録パワーで記録することが可能に
なる。If excessive power is applied to the recording layer, the recording bits may become too large, the bit shape may deteriorate, or the recording layer may be damaged. In order to solve this problem, it is sufficient that each recording layer has a different light absorption rate. That is,
The first recording layer 1 has the smallest light absorption, and the light absorption increases sequentially, and the fifth recording layer 5 has the largest light absorption. If the light absorption of each recording layer is adjusted appropriately, It becomes possible to record on any recording layer with appropriate recording power.
各記録層の光吸収の調整は、上記のビスマス置換ガーネ
ットを用いた記録担体の例では、ガーネットの組成を調
整することによって可能である。In the example of the record carrier using bismuth-substituted garnet described above, the light absorption of each recording layer can be adjusted by adjusting the composition of the garnet.
すなわち、ガリウムのＩｙを多（すれば光吸収は小さく
なり、コバルトの量２を多くすれば光吸収は大きくなる
。また、記録層の厚みを変えて光吸収を調整することも
可能である。That is, increasing the amount of Iy of gallium decreases the optical absorption, and increasing the amount of cobalt increases the optical absorption. It is also possible to adjust the optical absorption by changing the thickness of the recording layer.
半透明の光磁気記録材料としては、上記のビスマス置換
ガーネットのほかに、コバルトフェライトＣｏＦｅｚＯ
４、バリウムフェライトＢａＦｅ ＋ ２０１ ｑなど
を用いてもよい。これらの記録材料でも、例えば、鉄（
Ｆ ｅ）をガリウムなどの非磁性元素で置換しくＣｏＧ
ａｘＦｅｚ−ｘ０４＋ ＢａＧａＸＦｅ＋ｚ−ｘＯ＋Ｊ
、その置換のｔｘを調整して光吸収を適当にすること
ができる。In addition to the above-mentioned bismuth-substituted garnet, cobalt ferrite CoFezO is used as a translucent magneto-optical recording material.
4. Barium ferrite BaFe + 201 q or the like may be used. Even with these recording materials, for example, iron (
CoG to replace Fe) with a non-magnetic element such as gallium
axFez-x04+ BaGaXFe+z-xO+J
, the tx of that substitution can be adjusted to suit the light absorption.
第２図は、本発明による多層光磁気記録を行なうための
装置の例を模式的に示すものであり、同図中、２１は記
録担体、２２は光源、２３ 、２４ 、２５゜２６はレ
ンズ、２７はハーフミラ−１２８はミラー、２９ 、３
０ 、３１は偏光フィルター、３２ 、３３は光検出器
である。FIG. 2 schematically shows an example of an apparatus for performing multilayer magneto-optical recording according to the present invention, in which 21 is a record carrier, 22 is a light source, 23, 24, 25, and 26 are lenses. , 27 is a half mirror - 128 is a mirror, 29 , 3
0 and 31 are polarizing filters, and 32 and 33 are photodetectors.
光源２２から発生したレーザー光３４はレンス２３で平
行光にされ、ミラー２８で反射され、レンズ２４で記録
担体２１中の所望の記録層に集光される。このとき、記
録担体２１からの反射光３５はレンズ２４．ミラー２８
．ハーフミラ−２７、レンズ２５を介して光検出器３２
に至り、この反射光を利用してレーザービームのフォー
カスおよびトラッキングを行なう。この目的のためには
、記録担体２１にフォーカスおよびトラッキング用の反
射層を設けておく。こうして、レーザービームを記録層
上に走査して記録を行なう。記録は、一般に、全体を一
方向に磁化した後、レーザービームを照射して記録層を
選択的に加熱し、その部分の磁化の向きを反転させ、（
このとき、一般的には、外部磁界は不要であるが、外部
磁界を印加してもよい。）、この磁化の向きの配列によ
って情報を記録する。A laser beam 34 generated from a light source 22 is collimated by a lens 23, reflected by a mirror 28, and focused by a lens 24 onto a desired recording layer in the record carrier 21. At this time, the reflected light 35 from the record carrier 21 is reflected by the lens 24. mirror 28
．． Photodetector 32 via half mirror 27 and lens 25
This reflected light is then used to focus and track the laser beam. For this purpose, the record carrier 21 is provided with a reflective layer for focusing and tracking. In this way, recording is performed by scanning the laser beam onto the recording layer. Generally, recording is performed by magnetizing the entire recording layer in one direction, then selectively heating the recording layer by irradiating it with a laser beam, and reversing the direction of magnetization in that part.
At this time, an external magnetic field is generally not required, but an external magnetic field may be applied. ), information is recorded by the arrangement of this magnetization direction.
記録担体２１中の所望の記録層にフォーカスするには、
例えば、レンズ２４を上下して調整する。To focus on a desired recording layer in the record carrier 21,
For example, the lens 24 is adjusted by moving it up and down.
再生は上記書き込みと基本的に同一の操作により所望の
記録層にフォーカスし、走査するが、再生用レーザー光
のパワーは書き込み用レーザー光のパワーより小さい。For reproduction, a desired recording layer is focused and scanned by basically the same operation as for writing, but the power of the reproduction laser beam is smaller than the power of the writing laser beam.
このパワーの調整は光源２２で行なってもよいが、フィ
ルター２９などで行なってもよい。所望の記録層に集光
されたレーザービームは、前述のように、スペーサ層の
存在のために、他の記録層中の情報をひろうことばな（
、集光された特定の記録層の情報だけをひろって、すな
わちその記録層の情報に基づいて右または左にファラデ
ー回転し、記録担体２１を透過する。透過光３６をレン
ズ２６．偏光フィルター３１を介して光検出器３３で検
出すると、記録層中の情報を再生することができる。This power adjustment may be performed by the light source 22, but may also be performed by a filter 29 or the like. As mentioned above, the laser beam focused on the desired recording layer is unable to pick up information in other recording layers due to the presence of the spacer layer (
, the light is transmitted through the record carrier 21 by extracting only the information on the specific recording layer that has been focused, that is, based on the information on the recording layer, it is Faraday rotated to the right or left. The transmitted light 36 is passed through the lens 26. When detected by the photodetector 33 through the polarizing filter 31, the information in the recording layer can be reproduced.
以上、多層光磁気記録用の記録担体、装置およびその操
作について実施例を用いて説明したが、これらはあくま
で例であって、本発明は広く多層光磁気記録一般の方法
、装置および記録担体を提供するものである。The record carrier, device, and operation thereof for multilayer magneto-optical recording have been described above using examples, but these are merely examples, and the present invention broadly applies to methods, devices, and record carriers for multilayer magneto-optical recording in general. This is what we provide.
本発明により、多層の記録層による光磁気記録が提供さ
れ、記録密度は記録層の数に応じて増加するので飛曜的
に増加する。記録層の数は記録材料の選択や改良、光学
系の工夫などにより増加することは明らかである。According to the present invention, magneto-optical recording using multiple recording layers is provided, and since the recording density increases according to the number of recording layers, it increases exponentially. It is clear that the number of recording layers can be increased by selecting and improving recording materials, devising optical systems, etc.
第１図は本発明による多層光磁気記録担体の模武断面図
、第２図は本発明による多層光磁気記録装置の模式図で
ある。
■・・・第１記録層、 ２・・・第２記録層、５・・
・第５記録層、 ５，６．９・・・スペーサ、１０
・・・保護層、 １１・・・基板、１２．１３・
・・レーザービーム、
２１・・・記録担体、 ２２・・・光源、２３ 、２
４ 、２５ 、２６・・・レンズ、２７・・・ハーフミ
ラ−１２８・・・ミラー、２９ 、３０ 、３１・・・
偏光フィルター、３２ 、３３・・・光検出器、 ３４
・・・レーザ光、３５・・・反射光、 ３６・・・
透過光。
第１ 図 １１・・・基板
１２．１３・・・入射光
２１・・・記録担体
２２・・・光源
２７・・・ハーフミラ−FIG. 1 is a cross-sectional view of a multilayer magneto-optical recording carrier according to the present invention, and FIG. 2 is a schematic diagram of a multilayer magneto-optical recording device according to the present invention. ■...First recording layer, 2...Second recording layer, 5...
・Fifth recording layer, 5, 6.9... Spacer, 10
...protective layer, 11...substrate, 12.13.
...Laser beam, 21...Record carrier, 22...Light source, 23, 2
4, 25, 26...lens, 27...half mirror 128...mirror, 29, 30, 31...
Polarizing filter, 32, 33...photodetector, 34
...Laser light, 35...Reflected light, 36...
Transmitted light. 11...Substrate 12.13...Incoming light 21...Record carrier 22...Light source 27...Half mirror
Claims (1)
記録担体を用い、その光磁気記録材料層の夫々に独立に
光磁気記録のための情報の記録、消去および（または）
再生を行なうことを特徴とする光磁気記録方法。 ２、複数の半透明光磁気記録材料層を積層して有する記
録担体を所定の位置にセットし、その記録担体の光磁気
記録層の夫々に独立に光を集光し、それによって光磁気
記録のための情報の記録、消去および（または）再生を
行なうことを特徴とする光磁気記録装置。 ３、基板上に半透明の光磁気記録材料層を透明スペーサ
層を狭んで複数層積み重ねたことを特徴とする光磁気記
録担体。[Claims] 1. Recording of information for magneto-optical recording independently in each of the layers of the magneto-optical recording material using a record carrier provided with a plurality of laminated layers of semi-transparent magneto-optical recording material; Erase and/or
A magneto-optical recording method characterized by reproduction. 2. A record carrier having a plurality of laminated layers of translucent magneto-optical recording material is set in a predetermined position, and light is focused independently on each of the magneto-optical recording layers of the record carrier, thereby producing magneto-optical recording. 1. A magneto-optical recording device for recording, erasing and/or reproducing information. 3. A magneto-optical recording carrier comprising a plurality of translucent magneto-optical recording material layers stacked on a substrate with a transparent spacer layer between them.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61055022A JP2679704B2 (en) | 1986-03-14 | 1986-03-14 | Magneto-optical recording device and carrier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61055022A JP2679704B2 (en) | 1986-03-14 | 1986-03-14 | Magneto-optical recording device and carrier |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62214538A true JPS62214538A (en) | 1987-09-21 |
| JP2679704B2 JP2679704B2 (en) | 1997-11-19 |
Family
ID=12987040
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61055022A Expired - Fee Related JP2679704B2 (en) | 1986-03-14 | 1986-03-14 | Magneto-optical recording device and carrier |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2679704B2 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61107552A (en) * | 1984-10-30 | 1986-05-26 | Brother Ind Ltd | Optical recording medium |
| JPS61107553A (en) * | 1984-10-30 | 1986-05-26 | Brother Ind Ltd | Optomagnetic reproducing device |
-
1986
- 1986-03-14 JP JP61055022A patent/JP2679704B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61107552A (en) * | 1984-10-30 | 1986-05-26 | Brother Ind Ltd | Optical recording medium |
| JPS61107553A (en) * | 1984-10-30 | 1986-05-26 | Brother Ind Ltd | Optomagnetic reproducing device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2679704B2 (en) | 1997-11-19 |
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| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |