JPH05325277A - Magneto-optical recording medium and its manufacture - Google Patents
Magneto-optical recording medium and its manufactureInfo
- Publication number
- JPH05325277A JPH05325277A JP12456892A JP12456892A JPH05325277A JP H05325277 A JPH05325277 A JP H05325277A JP 12456892 A JP12456892 A JP 12456892A JP 12456892 A JP12456892 A JP 12456892A JP H05325277 A JPH05325277 A JP H05325277A
- Authority
- JP
- Japan
- Prior art keywords
- layer
- recording
- magneto
- initialization
- optical 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
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、情報の記録再生に用
いられる光磁気記録媒体、特に初期化層によって光変調
ダイレクト・オーバーライト機能を付与した光磁気記録
媒体およびその製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magneto-optical recording medium used for recording and reproducing information, and more particularly to a magneto-optical recording medium provided with an optical modulation direct overwrite function by an initialization layer and a method for manufacturing the same.
【０００２】[0002]
【従来の技術】図１２は、例えばJournal of Applied P
hysics vol. 67 No.９（１．May.'90)，PP. 4415〜4416
に示された従来の光磁気記録媒体の構成図である。図１
２において、１は半導体レーザ等により出射されレンズ
により集光された光ビーム、２はＨｂの磁界を発生させ
る外部磁界発生装置、３はガラスまたはプラスチックの
透明基板、４〜７は互いに交換結合した４層の磁性層で
あり、第１磁性層４、第２磁性層５、第３磁性層６、第
４磁性層７で構成されている。2. Description of the Related Art FIG. 12 shows, for example, the Journal of Applied P.
hysics vol. 67 No. 9 (1. May. '90), PP. 4415-4416
FIG. 6 is a configuration diagram of a conventional magneto-optical recording medium shown in FIG. Figure 1
In FIG. 2, 1 is a light beam emitted by a semiconductor laser or the like and condensed by a lens, 2 is an external magnetic field generator for generating a magnetic field of Hb, 3 is a transparent substrate of glass or plastic, and 4 to 7 are exchange-coupled to each other. It is a four-layer magnetic layer and is composed of a first magnetic layer 4, a second magnetic layer 5, a third magnetic layer 6, and a fourth magnetic layer 7.
【０００３】次に、ダイレクト・オーバーライトのメカ
ニズムについて説明する。図１３は、ある温度での遷移
金属副格子磁化の方向を示し、図１４に記録時
（ＰHIGH，ＰLOW ）と再生時（ＰREAD）の３値変調され
る光ビームの光強度を示している。図１４のＰREADは非
常に小さなパワーのため、磁化状態（記録状態）は変化
しないが、ＰLOW ，ＰHIGHでは記録膜の温度が上昇し、
その最高到達温度はＴLOW ，ＴHIGHとなり、以後冷却時
の磁化状態の変化により「０」または「１」の記録が行
われ、それぞれ「低パワー・プロセス」と「高パワー・
プロセス」と呼び、この二つについて図１３により説明
する。Next, the mechanism of direct overwrite will be described. FIG. 13 shows the direction of the transition metal sublattice magnetization at a certain temperature, and FIG. 14 shows the light intensity of the ternary-modulated light beam during recording (P HIGH , P LOW ) and during reproduction (P READ ). ing. Since P READ in FIG. 14 has a very small power, the magnetization state (recording state) does not change, but the temperature of the recording film rises at P LOW and P HIGH .
The maximum temperatures reached are T LOW and T HIGH , and after that, “0” or “1” is recorded depending on the change of the magnetization state during cooling, and “low power process” and “high power process” respectively.
These are referred to as "processes", and these two will be described with reference to FIG.
【０００４】「低パワー・プロセス」においては、第２
磁性層５と第４磁性層７はその遷移金属副格子磁化の方
向に変化なく上向きであり、その後の冷却時に第１磁性
層４は第２磁性層５からの交換力により遷移金属副格子
磁化の方向は揃い、上向きとなり、「０」が記録され
る。In the "low power process", the second
The magnetic layer 5 and the fourth magnetic layer 7 are directed upward without any change in the direction of the transition metal sublattice magnetization, and during subsequent cooling, the first magnetic layer 4 is transformed by the exchange force from the second magnetic layer 5 into the transition metal sublattice magnetization. The directions are aligned and face up, and "0" is recorded.
【０００５】また、「高いパワー・プロセス」において
は、媒体温度がＴHIGHまで、つまり、第２磁性層５のキ
ュリー温度ＴC2近傍まで上昇するため、第４磁性層７の
みが遷移金属副格子磁化の方向が上向きとなっている。
その後の冷却時に外部磁界発生装置２による磁界Ｈｂに
より、第２磁性層５の遷移金属副格子磁化の方向が下向
きとなり、次に第１磁性層４が「低パワー・プロセス」
同様に第２磁性層５からの交換力により下向きになる。In the "high power process", the medium temperature rises up to T HIGH , that is, near the Curie temperature T C2 of the second magnetic layer 5, so that only the fourth magnetic layer 7 is a transition metal sublattice. The direction of magnetization is upward.
During subsequent cooling, the magnetic field Hb generated by the external magnetic field generator 2 causes the direction of the transition metal sublattice magnetization of the second magnetic layer 5 to be downward, and the first magnetic layer 4 is then "low power process".
Similarly, it is directed downward by the exchange force from the second magnetic layer 5.
【０００６】室温近傍において、第２磁性層５が第３磁
性層６からの交換力により上向きに戻す初期化過程が起
こるが、第１磁性層４はこの時点では交換力による磁化
の反転はなく、下向きを保ち「１」が記録される。以上
のようにして、光変調によるダイレクト・オーバーライ
トが実現される。In the vicinity of room temperature, an initialization process occurs in which the second magnetic layer 5 is returned upward by the exchange force from the third magnetic layer 6, but the first magnetic layer 4 has no magnetization reversal due to the exchange force at this point. , Keep downward and "1" is recorded. As described above, direct overwrite by light modulation is realized.
【０００７】次に、第２磁性層５を初期状態である上向
きに戻す初期化過程についてさらに詳細に述べる。高パ
ワー・プロセスからの冷却過程において、まず第３磁性
層６の磁化の方向が交換結合力によって、第４磁性層７
の磁化の方向に揃い、遷移金属副格子磁化は上向きとな
る。Next, the initialization process for returning the second magnetic layer 5 to the initial state of upward will be described in more detail. In the cooling process from the high power process, first, the direction of magnetization of the third magnetic layer 6 is changed by the exchange coupling force to the fourth magnetic layer 7
And the transition metal sublattice magnetization is in the upward direction.
【０００８】次に、第２磁性層５の磁化の方向が交換結
合力によって第３磁性層６の磁化の方向に揃い、遷移金
属副格子磁化が上向きになって初期状態に戻され、初期
化過程が完了する。第４磁性層７は第２磁性層５の磁化
の方向を次の記録に備えて常に上向きに初期化する働き
を持つので、第４磁性層７は「初期化層」と呼ばれる。
後述するこの発明においても、第４磁性層７を初期化層
７として以後記載する。Next, the direction of magnetization of the second magnetic layer 5 is aligned with the direction of magnetization of the third magnetic layer 6 by the exchange coupling force, the transition metal sublattice magnetization is turned upward and returned to the initial state, and initialization is performed. The process is complete. The fourth magnetic layer 7 is called an "initialization layer" because it has the function of always initializing the magnetization direction of the second magnetic layer 5 upward in preparation for the next recording.
In the present invention described later, the fourth magnetic layer 7 will be described as the initialization layer 7 hereinafter.
【０００９】[0009]
【発明が解決しようとする課題】以上説明したように、
ダイレクトオーバーライトを実現するには、初期化層７
の磁化の方向は常に一方向に保持される必要があり、高
パワー・プロセスを含め、全ての記録再生の過程におい
て、磁化反転を起こしてはならない。しかしながら、高
パワー・プロセスにおける光パワーＰHIGHが過大の場合
には、初期化層７の磁化の方向が反転する場合もあるこ
とが判った。As described above,
To realize direct overwrite, the initialization layer 7
The direction of magnetization must always be maintained in one direction, and magnetization reversal must not occur during all recording / reproducing processes including high-power processes. However, it has been found that when the optical power P HIGH in the high power process is excessively large, the magnetization direction of the initialization layer 7 may be reversed.
【００１０】図１５は再生信号の搬送波対雑音（Ｃ／
Ｎ）比の記録光ビームのパワーＰHIGHに対する依存性で
ある。ここでＰHIGHが１０mWを超えると、急激にＣ／Ｎ
比が低下しており、この時、初期化層７を偏光顕微鏡に
よって観察したところ、記録領域の初期化層の一部が磁
化反転していることが確かめられた。これは、ＰHIGHが
過剰のために、磁性層の温度が初期化層のキュリー温度
付近まで上昇し、初期化層の磁化が反転したものであ
る。FIG. 15 shows the carrier-to-noise (C / C) of the reproduced signal.
N) ratio is the dependence of the recording light beam power P HIGH . If P HIGH exceeds 10 mW, the C / N will suddenly increase.
At this time, the initialization layer 7 was observed with a polarization microscope, and it was confirmed that a part of the initialization layer in the recording region had a magnetization reversal. This is because the P HIGH is excessive and the temperature of the magnetic layer rises to near the Curie temperature of the initialization layer, and the magnetization of the initialization layer is reversed.
【００１１】また、図１６は繰り返し記録再生を行なっ
たときの再生信号のビットエラーレートの繰り返し記録
再生回数に対する依存性である。繰り返し記録回数が１
×１０4 回を超える付近から、ビットエラーレートの増
大が見られる。エラーが増大した光磁気記録媒体の初期
化層７の磁化が反転していることが確かめられた。この
場合は、１回の記録再生では問題にならない初期化層の
磁化方向の反転またはゆらぎが繰り返し、記録再生によ
って拡大され、エラーの増加につながる程の初期化層７
の磁化反転を引き起こしたものと考えられる。FIG. 16 shows the dependence of the bit error rate of the reproduced signal upon the repeated recording / reproduction on the number of times of the repeated recording / reproduction. Number of repeated recordings is 1
An increase in the bit error rate is seen from the vicinity of more than × 10 4 times. It was confirmed that the magnetization of the initialization layer 7 of the magneto-optical recording medium with increased error was reversed. In this case, the reversal or fluctuation of the magnetization direction of the initialization layer, which is not a problem in one recording / reproduction, is repeated, and the initialization layer 7 is enlarged by recording / reproduction and leads to an increase in errors.
It is thought that this caused the magnetization reversal of.
【００１２】以上述べたように、図１２に示した光磁気
記録媒体においては、光変調ダイレクト・オーバーライ
ト光磁気記録媒体に特有の初期化層７の磁化反転の問題
があるために、記録ビームの光パワーの上限が低く制限
され、また繰り返し記録再生可能回数が制限される場合
があることが判明した。As described above, in the magneto-optical recording medium shown in FIG. 12, the recording beam has a problem of magnetization reversal of the initialization layer 7 peculiar to the optical modulation direct overwrite magneto-optical recording medium. It has been found that the upper limit of the optical power of is limited to a low level, and the number of times recording and reproduction can be repeated is limited in some cases.
【００１３】この発明は、上記のような問題点を解消す
るためになされたものであり、初期化層によって光変調
ダイレクト・オーバーライトの機能を付与した光磁気記
録媒体において、高い記録パワーに対しても信号の劣化
がなく、また優れた耐繰り返し記録再生特性を有する光
磁気記録媒体を得ることを目的としており、また、樹脂
層を形成するのに必要な樹脂の量を低減でき、極めて安
定した樹脂層厚、初期化層過熱を抑制でき、樹脂層形
状、安定な外観品質を有し、さらに、製品歩留りを向上
させることができる光磁気記録媒体の製造方法を得るこ
とを目的としている。The present invention has been made in order to solve the above problems, and in a magneto-optical recording medium provided with a function of optical modulation direct overwrite by an initialization layer, it has a high recording power. However, the purpose is to obtain a magneto-optical recording medium that does not cause signal deterioration and that has excellent resistance to repeated recording / reproduction. Also, the amount of resin required to form the resin layer can be reduced, and it is extremely stable. It is an object of the present invention to obtain a method for manufacturing a magneto-optical recording medium which can suppress the resin layer thickness and the initialization layer overheating, have a resin layer shape and stable appearance quality, and further improve the product yield.
【００１４】[0014]
【課題を解決するための手段】この発明に係る光磁気記
録媒体は、初期化層を含む記録膜と、この記録膜に密接
し、基板と逆側に設けられた樹脂層とを設けたものであ
る。A magneto-optical recording medium according to the present invention is provided with a recording film including an initialization layer and a resin layer which is in close contact with the recording film and is provided on the opposite side of the substrate. Is.
【００１５】また、この発明に係る光磁気記録媒体の製
造方法は、穴透明基板上に第１磁性層から第３磁性層お
よび初期化層の４層を順次積層して記録膜を形成する工
程と、初期化層の記録再生領域以外を金属製のマスクで
覆って記録再生領域に樹脂を塗布して紫外線の照射によ
り硬化させて第１樹脂層を形成する工程を導入したもの
である。Further, in the method for manufacturing a magneto-optical recording medium according to the present invention, a step of forming a recording film by sequentially laminating four layers of a first magnetic layer to a third magnetic layer and an initialization layer on a transparent substrate having holes. Then, a step of forming a first resin layer by covering a region other than the recording / reproducing region of the initialization layer with a metal mask and applying a resin to the recording / reproducing region and curing the resin by irradiation of ultraviolet rays is introduced.
【００１６】また、この発明に係る光磁気記録媒体の製
造方法は、第１樹脂層形成後さらに樹脂を塗布して硬化
させることにより第２樹脂層を形成する工程を導入した
ものである。Further, the method of manufacturing a magneto-optical recording medium according to the present invention introduces a step of forming a second resin layer by applying a resin and curing the resin after forming the first resin layer.
【００１７】さらに、この発明に係る光磁気記録媒体は
初期化層と第１樹脂層との間に誘電体と金属薄膜を介在
させたものである。Further, the magneto-optical recording medium according to the present invention has a dielectric and a metal thin film interposed between the initialization layer and the first resin layer.
【００１８】この発明に係る光磁気記録媒体は、２枚の
光磁気記録媒体の樹脂層を互いに向かい合わせて接着層
により接合する工程を導入したものである。The magneto-optical recording medium according to the present invention introduces a step of adhering the resin layers of two magneto-optical recording media to each other and adhering them by an adhesive layer.
【００１９】さらに、この発明に係る光磁気記録媒体
は、２枚の光磁気記録媒体の樹脂層を互いに向かい合わ
せて、接着層を内周領域と外周領域に形成して接合する
工程を導入したものである。Further, in the magneto-optical recording medium according to the present invention, a step is introduced in which the resin layers of the two magneto-optical recording media are opposed to each other, and the adhesive layers are formed in the inner peripheral region and the outer peripheral region to bond them. It is a thing.
【００２０】また、この発明に係る光磁気記録媒体の製
造方法は、２枚の光磁気記録媒体の両方の樹脂層同志を
向かい合わせるか、または一方の光磁気記録媒体の樹脂
層と初期化層とを向かい合わせて、樹脂層を硬化する前
に圧接する工程を導入したものである。In the method of manufacturing a magneto-optical recording medium according to the present invention, both resin layers of two magneto-optical recording media face each other, or the resin layer and the initialization layer of one magneto-optical recording medium. And a step of bringing them into contact with each other and pressing them before curing the resin layer.
【００２１】さらに、この発明に係る光磁気記録媒体の
製造方法は、初期化層上に誘電体層を介して金属薄膜層
を形成した２枚の光磁気記録媒体の金属薄膜層を互いに
向かい合わせて、その間に樹脂層を介在させて接合する
工程を導入したものである。Further, in the method of manufacturing a magneto-optical recording medium according to the present invention, the metal thin film layers of the two magneto-optical recording media in which the metal thin film layer is formed on the initialization layer via the dielectric layer are opposed to each other. Then, a step of joining by interposing a resin layer therebetween is introduced.
【００２２】[0022]
【作用】この発明における光磁気記録媒体においては、
初期化層を含む記録膜に接して基板と逆側に樹脂層を設
けたことによって記録時の集光ビームによる初期化層の
熱が樹脂層に吸収された初期化層の過熱が抑制され、初
期化層の磁化反転を防止することができ、その結果とし
て、高い記録パワーまで信号の劣化を引き起こすことな
く、記録再生が行え、また繰り返し記録再生可能回数の
飛躍的な増大がもたらされる。In the magneto-optical recording medium according to the present invention,
By providing the resin layer on the side opposite to the substrate in contact with the recording film including the initialization layer, the heat of the initialization layer due to the focused beam at the time of recording is absorbed by the resin layer and the overheating of the initialization layer is suppressed, The magnetization reversal of the initialization layer can be prevented, and as a result, recording / reproduction can be performed up to high recording power without causing signal deterioration, and the number of times of repetitive recording / reproduction is dramatically increased.
【００２３】また、この発明の光磁気記録媒体の製造方
法においては、初期化層形成後に金属製マスクで覆って
記録再生領域のみに樹脂層を形成することから、必要な
樹脂量のみでよく、安定した樹脂膜厚と樹脂層を形成す
る。Further, in the method of manufacturing the magneto-optical recording medium of the present invention, since the resin layer is formed only in the recording / reproducing area by covering with the metal mask after the initialization layer is formed, only the required resin amount is required. A stable resin film thickness and a resin layer are formed.
【００２４】この発明の光磁気記録媒体の製造方法にお
いては、第１樹脂層形成後第２樹脂層を形成することに
より、第１樹脂層の塗布むら、塗り残しむらを解消する
とともに、初期化層の過熱を抑制することになり、製品
歩留まりを向上させる。In the method of manufacturing a magneto-optical recording medium according to the present invention, by forming the second resin layer after forming the first resin layer, uneven coating and uneven coating can be eliminated and initialization is performed. This will prevent overheating of the layers and improve product yield.
【００２５】この発明の光磁気記録媒体においては、初
期化層と樹脂層との間に誘電体層と金属薄膜を形成する
ことにより、記録時に初期化層に付与された熱エネルギ
を誘電体層を介して金属薄膜に迅速に伝達し、金属薄膜
に蓄積されることなく、樹脂層に伝達され、初期化層の
過熱を抑制する。In the magneto-optical recording medium of the present invention, the dielectric layer and the metal thin film are formed between the initialization layer and the resin layer, so that the thermal energy applied to the initialization layer at the time of recording can be applied to the dielectric layer. Is rapidly transferred to the metal thin film via the resin, and is transferred to the resin layer without being accumulated in the metal thin film, thereby suppressing overheating of the initialization layer.
【００２６】さらに、この発明の光磁気記録媒体の製造
方法においては、２枚の光磁気記録媒体の樹脂層を互い
に向かい合わせて接着層で接合することにより、両面光
磁気記録媒体が得られる。Further, in the method of manufacturing a magneto-optical recording medium of the present invention, a double-sided magneto-optical recording medium can be obtained by facing the resin layers of two magneto-optical recording media to each other and bonding them with an adhesive layer.
【００２７】また、この発明の光磁気記録媒体の製造方
法においては、２枚の光磁気記録媒体の第２樹脂層を互
いに向かい合わせて、内周領域と外周領域を接着層で接
合するから、接着層を必要量に削減することになる。In the method of manufacturing a magneto-optical recording medium according to the present invention, the second resin layers of the two magneto-optical recording media are opposed to each other, and the inner peripheral region and the outer peripheral region are bonded by the adhesive layer. The adhesive layer will be reduced to the required amount.
【００２８】また、この発明の光磁気記録媒体の製造方
法においては、２枚の光磁気記録媒体の樹脂層共有と
し、樹脂層の硬化前に両光磁気記録媒体を圧接すること
により、両面光磁気記録媒体が得られる。In the method of manufacturing a magneto-optical recording medium according to the present invention, the two magneto-optical recording media are shared by the resin layers, and both magneto-optical recording media are pressed before the resin layers are cured. A magnetic recording medium is obtained.
【００２９】さらに、この発明の光磁気記録媒体は２枚
の光磁気記録媒体の樹脂層を共有として２枚を接合する
から、両光磁気記録媒体が得られ、２枚の光磁気記録媒
体にそれぞれ誘電体層と金属薄膜を有するから、両初期
化層に熱エネルギが付与されたとき、それぞれ誘電体層
と金属薄膜を介して両方の樹脂層に伝達され、初期化層
の過熱を抑制する。Further, in the magneto-optical recording medium of the present invention, the two magneto-optical recording media are joined by sharing the resin layer of the two magneto-optical recording media, so that both magneto-optical recording media can be obtained and two magneto-optical recording media can be obtained. Since each has a dielectric layer and a metal thin film, when heat energy is applied to both initialization layers, it is transmitted to both resin layers via the dielectric layer and the metal thin film, respectively, and suppresses overheating of the initialization layer. ..
【００３０】[0030]
実施例１．以下、この発明の実施例を図を用いて説明す
る。図１はこの発明の光磁気記録媒体の一実施例の断面
図を示す。図１における１３はガラスまたはプラスチッ
クの透明基板、１４〜１７は互いに交換結合した４層の
磁性層であり、第１磁性層１４、第２磁性層１５、第３
磁性層１６、初期化層１７（第４磁性層）、樹脂層１８
となっている。以下に各層の諸元を記す。 透明基板１３：外周半径６５mm、中心孔半径７．５mm、
厚み１．２mm、記録再生領域が半径３０mmから６０mmの
範囲の案内溝付きポリカーボネート基板、 第１磁性層１４：Ｔｂ24Ｆｅ72Ｃｏ4 ３元系非晶質合金
薄膜、 第２磁性層１５：Ｄｙ25Ｆｅ45Ｃｏ30３元系非晶質合金
薄膜、 第３磁性層１６：Ｔｂ18Ｆｅ84２元系非晶質合金薄膜、 初期化層１７：Ｔｂ30Ｃｏ70２元系非晶質合金薄膜、 樹脂層１８：紫外線硬化型樹脂、 この実施例１の光記録媒体は透明基板１３上の半径２５
mmから半径６２mmの同心円領域に、第１磁性層１４、第
２磁性層１５、第３磁性層１６、初期化層１７の４層か
らなる記録膜を順次マグネトロンスパッタ法により成膜
し、その後初期化層１７に接して樹脂層１８をスピンコ
ーティング塗布した後、紫外線を照射して樹脂層１８を
硬化させることによって作製した。Example 1. Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of an embodiment of the magneto-optical recording medium of the present invention. In FIG. 1, 13 is a glass or plastic transparent substrate, and 14 to 17 are four magnetic layers exchange-coupled to each other. The first magnetic layer 14, the second magnetic layer 15, and the third magnetic layer.
Magnetic layer 16, initialization layer 17 (fourth magnetic layer), resin layer 18
Has become. The specifications of each layer are described below. Transparent substrate 13: outer peripheral radius 65 mm, central hole radius 7.5 mm,
Polycarbonate substrate with a guide groove having a thickness of 1.2 mm and a recording / reproducing area ranging from a radius of 30 mm to 60 mm, the first magnetic layer 14: Tb 24 Fe 72 Co 4 ternary amorphous alloy thin film, the second magnetic layer 15: Dy 25 Fe 45 Co 30 ternary amorphous alloy thin film, third magnetic layer 16: Tb 18 Fe 84 binary amorphous alloy thin film, initialization layer 17: Tb 30 Co 70 binary amorphous alloy thin film Resin layer 18: UV curable resin The optical recording medium of Example 1 has a radius of 25 on the transparent substrate 13.
A recording film consisting of four layers of the first magnetic layer 14, the second magnetic layer 15, the third magnetic layer 16 and the initialization layer 17 is sequentially formed by a magnetron sputtering method in a concentric area with a radius of 62 mm to a radius of 62 mm. The resin layer 18 was applied by spin coating in contact with the chemical layer 17, and then the resin layer 18 was cured by irradiation with ultraviolet rays.
【００３１】図２は、実施例１の光磁気記録媒体の再生
信号のＣ／Ｎ比の記録光ビームのパワーＰHIGHに対する
依存性である。ここで樹脂層１８がない場合には、Ｐ
HIGHが１０mWを超えると急激にＣ／Ｎ比が低下したのに
対し、樹脂層１８を付与したこの実施例では、ＰHIGHが
１２．５mWを超えるまでＣ／Ｎ比が低下しない。FIG. 2 shows the dependence of the C / N ratio of the reproduction signal of the magneto-optical recording medium of Example 1 on the power P HIGH of the recording light beam. Here, when the resin layer 18 is not provided, P
When HIGH exceeds 10 mW, the C / N ratio sharply decreases, whereas in this embodiment with the resin layer 18, the C / N ratio does not decrease until P HIGH exceeds 12.5 mW.
【００３２】これは記録光ビームの加熱による初期化層
１７の熱が樹脂層１８へ伝達吸収され、初期化層１７の
温度上昇が抑制され、より大きなＰHIGHまで初期化層の
磁化反転による特性劣化が抑えられたものである。This is because the heat of the initialization layer 17 due to the heating of the recording light beam is transferred to and absorbed in the resin layer 18, the temperature rise of the initialization layer 17 is suppressed, and the characteristics due to the magnetization reversal of the initialization layer up to a larger P HIGH. Deterioration is suppressed.
【００３３】また、図３は実施例１の光磁気記録媒体に
繰り返し記録再生を行なったときの再生信号ビットエラ
ーレートの繰り返し記録再生回数に対する依存性であ
る。ここで樹脂層１８がない場合には、繰り返し記録回
数が１×１０4 回を超える付近からビットエラーレート
の増大が見られたのに対し、樹脂層１８を付与したこの
実施例１では、１×１０7 回の繰り返し記録再生に対し
ても、エラーの増加は見られない。FIG. 3 shows the dependence of the reproduction signal bit error rate on the number of times of repeated recording and reproduction when the recording and reproduction are repeatedly performed on the magneto-optical recording medium of the first embodiment. In the case where the resin layer 18 was not provided, the bit error rate increased from the vicinity of the number of times of repeated recording exceeding 1 × 10 4 , whereas in Example 1 in which the resin layer 18 was provided, No increase in error is observed even after repeatedly recording and reproducing 10 7 times.
【００３４】この媒体の初期化層を偏光顕微鏡で観察し
たところ繰り返し記録再生領域の初期化層１７の磁化は
一方向を向いており、繰り返し記録再生によるエラーの
増加につながる初期化層１７の磁化反転は起こっていな
い。なお、樹脂層１８の厚みとしては、０．３μｍ以上
であれば、初期化層１７の過熱を抑制することによって
得られるこの発明の効果が認められ、これよりも厚い樹
脂層１８を設けることによって、より確実にこの発明の
効果が発揮される。When the initialization layer of this medium is observed with a polarization microscope, the magnetization of the initialization layer 17 in the repetitive recording / reproducing area is oriented in one direction, and the magnetization of the initialization layer 17 leading to an increase in errors due to repetitive recording / reproducing. No reversal has occurred. If the thickness of the resin layer 18 is 0.3 μm or more, the effect of the present invention obtained by suppressing overheating of the initialization layer 17 is recognized, and by providing the resin layer 18 thicker than this. The effect of the present invention is exhibited more reliably.
【００３５】実施例２．図４はこの発明の実施例２を説
明する断面図である。この実施例２は実施例１の光磁気
記録媒体において記録再生を行なう領域（記録再生領
域）である半径３０mmから半径６０mmの同心円領域を包
含するように、図５に示すように半径２９．５mmから半
径６０．５mmの同心円領域以外を金属製のマスク１９に
よって覆い、半径２９．５mmから半径６０．５mmの同心
円領域に樹脂層１８を塗布、硬化させ形成したものであ
る。Example 2. Second Embodiment FIG. 4 is a sectional view illustrating a second embodiment of the present invention. The second embodiment includes a concentric area having a radius of 30 mm to a radius of 60 mm which is a recording / reproducing area (recording / reproducing area) in the magneto-optical recording medium of the first embodiment, and has a radius of 29.5 mm as shown in FIG. To a concentric region having a radius of 60.5 mm are covered with a metal mask 19, and a resin layer 18 is applied and cured on the concentric region having a radius of 29.5 mm to 60.5 mm.
【００３６】この実施例２の製造方法によって、実施例
１で述べたようなこの発明の効果を損なうことなく、樹
脂層１８を形成するのに必要な樹脂の量を低減でき、極
めて安定な樹脂層厚、樹脂層１８の形状、および安定な
外観品質を有する光磁気記録媒体を製造することができ
る。According to the manufacturing method of the second embodiment, the amount of the resin necessary for forming the resin layer 18 can be reduced without impairing the effect of the present invention as described in the first embodiment, and the extremely stable resin can be obtained. It is possible to manufacture a magneto-optical recording medium having a layer thickness, a shape of the resin layer 18, and a stable appearance quality.
【００３７】実施例３．図６はこの発明の実施例３によ
る光磁気記録媒体の製造方法により製造された光磁気記
録媒体の断面図である。この実施例３は実施例２中にて
述べた光磁気記録媒体の製造方法により樹脂層１８を設
けた後に、樹脂層を再塗布し硬化させることによって、
さらに第２の樹脂層を１層付加したものである。この発
明の効果を得るには、記録再生領域の初期化層１７と樹
脂層１８が密接して完全に覆われる必要があるが、例え
ば、実施例２の光磁気記録媒体の製造方法の工程におい
て、樹脂層１８の塗布むら、塗り残し等により、樹脂層
１８が完全に記録再生領域を覆っていない不具合が生じ
た場合、この実施例３の工程により、塗り残し部分にも
第２の樹脂層１８ａを形成することができ、この発明の
光磁気記録媒体の生産工程における製品歩留まりを向上
させる効果がある。Example 3. FIG. 6 is a sectional view of a magneto-optical recording medium manufactured by the method for manufacturing a magneto-optical recording medium according to Example 3 of the present invention. In the third embodiment, after the resin layer 18 is provided by the method of manufacturing the magneto-optical recording medium described in the second embodiment, the resin layer is recoated and cured,
Further, one second resin layer is added. In order to obtain the effect of the present invention, it is necessary that the initialization layer 17 and the resin layer 18 in the recording / reproducing area are intimately and completely covered. For example, in the step of the method for manufacturing the magneto-optical recording medium of the second embodiment If there is a problem that the resin layer 18 does not completely cover the recording / reproducing area due to uneven coating of the resin layer 18, uncoated portion, etc., the second resin layer is applied to the uncoated portion by the process of the third embodiment. 18a can be formed, which has the effect of improving the product yield in the manufacturing process of the magneto-optical recording medium of the present invention.
【００３８】また、この実施例３の工程によって作成さ
れた光磁気記録媒体は記録再生領域の樹脂層厚が他の領
域の樹脂層厚より厚くなり、初期化層１７の過熱を抑制
することによって得られるこの発明の効果がより確実に
得られるという効果がある。In the magneto-optical recording medium manufactured by the process of the third embodiment, the resin layer thickness in the recording / reproducing area becomes thicker than the resin layer thickness in the other areas, and the overheating of the initialization layer 17 is suppressed. There is an effect that the obtained effect of the present invention can be obtained more reliably.
【００３９】実施例４．図７はこの発明の実施例４の断
面図である。この実施例４における記録層は、樹脂層１
８に接する側からＡｕ、Ａｇ、Ａｌ、Ｃｕ、Ｎｉなどの
金属または合金からなる金属薄膜層２０、Ｔａ2 Ｏ5 、
ＳｉＮ、ＡｌＮ、ＡｌＳｉＮ、ＳｉＡｌＯＮ、ＳｉＯ、
ＳｉＯ2 、ＧｅＮなどからなる誘電体層２１を設けたも
のである。Example 4. 7 is a sectional view of Embodiment 4 of the present invention. The recording layer in this Example 4 is the resin layer 1
From the side in contact with 8, the metal thin film layer 20 made of a metal or alloy such as Au, Ag, Al, Cu, Ni, Ta 2 O 5 ,
SiN, AlN, AlSiN, SiAlON, SiO,
A dielectric layer 21 made of SiO 2 , GeN or the like is provided.
【００４０】この実施例４の構成の光磁気記録媒体で
は、記録時に初期化層１７に付与された熱エネルギは、
誘電体層２１を介して金属薄膜層２０に迅速に伝達さ
れ、しかも熱エネルギが金属薄膜層２０に蓄積されるこ
となく樹脂層１８に伝達される。これによって、初期化
層１７の過熱を抑制することによって得られるこの発明
の効果がより確実に得られるという効果が有る。In the magneto-optical recording medium of the fourth embodiment, the thermal energy applied to the initialization layer 17 during recording is
The heat energy is rapidly transferred to the metal thin film layer 20 through the dielectric layer 21, and the heat energy is transferred to the resin layer 18 without being accumulated in the metal thin film layer 20. As a result, there is an effect that the effect of the present invention obtained by suppressing the overheating of the initialization layer 17 can be obtained more reliably.
【００４１】実施例５．図８はこの発明の実施例５の断
面図である。この実施例５は初期化層を有する両面光磁
気記録媒体において、この発明の光磁気記録媒体の構成
を適用したものである。この実施例５の光磁気記録媒体
を作成する方法を以下に述べる。まず、実施例２の光磁
気記録媒体２枚を作成する。次に、この両媒体の樹脂層
１８を互いに向かい合わせ、ホットメルト接着剤や粘着
性テープなどの接着層２２によって接合したものであ
る。Example 5. FIG. 8 is a sectional view of a fifth embodiment of the present invention. Example 5 is a double-sided magneto-optical recording medium having an initialization layer, to which the structure of the magneto-optical recording medium of the present invention is applied. A method for producing the magneto-optical recording medium of Example 5 will be described below. First, two magneto-optical recording media of Example 2 are prepared. Next, the resin layers 18 of both the media are opposed to each other and joined by an adhesive layer 22 such as a hot melt adhesive or an adhesive tape.
【００４２】この実施例５の構成によって両面光磁気記
録媒体であっても、この発明の効果を得ることができ
る。また、接着層２２は樹脂層１８の未塗布部分である
内周部と外周部のみに設けることによって、接着層の必
要量を削減することもでき、この場合でも、この発明の
効果は変わらない。The effect of the present invention can be obtained even with a double-sided magneto-optical recording medium according to the configuration of the fifth embodiment. Further, the adhesive layer 22 can be provided only on the inner peripheral portion and the outer peripheral portion, which are the uncoated portions of the resin layer 18, so that the required amount of the adhesive layer can be reduced. Even in this case, the effect of the present invention does not change. ..
【００４３】実施例６．図９はこの発明の実施例６の断
面図である。この実施例６は実施例３に示した光磁気記
録媒体２枚をこの両媒体の樹脂層１８ａを互いに向かい
合わせ、ホットメルト接着剤や粘着性テープなどの接着
層２２を内周領域と外周領域に設けて接合したものであ
る。Example 6. FIG. 9 is a sectional view of a sixth embodiment of the present invention. In the sixth embodiment, the two magneto-optical recording media shown in the third embodiment are made to face each other with resin layers 18a of both media facing each other, and an adhesive layer 22 such as a hot-melt adhesive or an adhesive tape is provided on the inner peripheral region and the outer peripheral region. It is provided and joined to.
【００４４】実施例７．図１０はこの発明の実施例７の
断面図である。この実施例７は実施例５において両面の
光磁気記録媒体２枚にそれぞれ設けていた樹脂層１８
を、両面で一つの樹脂層１８を共有するようにしたもの
である。この実施例７の構成の光磁気記録媒体の作成方
法は以下の通りである。Example 7. FIG. 10 is a sectional view of Embodiment 7 of the present invention. In this Example 7, the resin layer 18 provided on each of the two magneto-optical recording media on both sides in Example 5 was used.
Is to share one resin layer 18 on both sides. The method for producing the magneto-optical recording medium having the structure of Example 7 is as follows.
【００４５】まず、実施例２で述べた方法によって２枚
の光磁気記録媒体の内１枚にエポキシ樹脂層１８を塗布
する。この時、樹脂層１８の塗布厚、あるいは塗布厚の
合計が０．３μｍ以上となるように塗布樹脂量を調節し
た。次に、この樹脂層１８が硬化する以前に両光磁気記
録媒体の記録層を互いに向かい合わせて、互いに押しつ
けるような圧力を印加した。First, the epoxy resin layer 18 is applied to one of the two magneto-optical recording media by the method described in the second embodiment. At this time, the coating resin amount was adjusted so that the coating thickness of the resin layer 18 or the total coating thickness was 0.3 μm or more. Next, before the resin layer 18 was cured, the recording layers of both magneto-optical recording media were opposed to each other and a pressure was applied to press them against each other.
【００４６】この際、接着強度の必要に応じた量のホッ
トメルト接着剤や粘着性テープなどの接着層２２を設け
た。この実施例７の構成によっても、実施例５と同様
に、この発明の効果を得ることができる。At this time, an adhesive layer 22 such as a hot melt adhesive or an adhesive tape was provided in an amount suitable for the adhesive strength. With the configuration of the seventh embodiment, the effect of the present invention can be obtained as in the fifth embodiment.
【００４７】実施例８．図１１はこの発明の実施例８の
断面図である。この実施例８は実施例７における光磁気
記録媒体の両面の各記録層として、それぞれ樹脂層１８
に接する側から、Ａｕ、Ａｇ、Ａｌ、Ｃｕ、Ｎｉなどの
金属または合金からなる金属薄膜層２０、Ｔａ2 Ｏ5 、
ＳｉＮ、ＡｌＮ、ＡｌＳｉＮ、ＳｉＡｌＯＮ、ＳｉＯ、
ＳｉＯ2、ＧｅＮなどからなる誘電体層２１を設けたも
のである。Example 8. 11 is a sectional view of an eighth embodiment of the present invention. In this Example 8, a resin layer 18 was used as each recording layer on both sides of the magneto-optical recording medium in Example 7.
From the side in contact with the metal thin film layer 20 made of a metal or alloy such as Au, Ag, Al, Cu, Ni, Ta 2 O 5 ,
SiN, AlN, AlSiN, SiAlON, SiO,
A dielectric layer 21 made of SiO 2 , GeN or the like is provided.
【００４８】上記各実施例では、樹脂層１８、第２樹脂
層１８ａとして紫外線硬化型樹脂や、エポキシ系樹脂を
用いたが、この他のゴム系樹脂、ウレタン系樹脂、アク
リル系樹脂の場合においても、樹脂層を記録膜上に密着
するよう設けた場合には、同様の効果が得られた。In each of the above-mentioned embodiments, the resin layer 18 and the second resin layer 18a are made of an ultraviolet curable resin or an epoxy resin, but in the case of other rubber resin, urethane resin or acrylic resin. However, when the resin layer was provided so as to be in close contact with the recording film, the same effect was obtained.
【００４９】また、上記実施例では、記録膜が磁性層の
みからなるもの、磁性層に接して誘電体層２１と金属薄
膜層２０を有するものについて説明したが、記録膜とし
て磁性層と基板の間、あるいは磁性層と樹脂層１８との
間、金属薄膜２０と樹脂層１８との間に誘電体などから
なる保護層を設けた光磁気記録媒体についても、この発
明の効果は変わらなかった。Further, in the above-mentioned embodiments, the description has been made of the recording film consisting only of the magnetic layer and the one having the dielectric layer 21 and the metal thin film layer 20 in contact with the magnetic layer, but the recording film is composed of the magnetic layer and the substrate. The effect of the present invention is not changed even in a magneto-optical recording medium in which a protective layer made of a dielectric or the like is provided between the magnetic layer and the resin layer 18, or between the metal thin film 20 and the resin layer 18.
【００５０】さらに、実施例５のような両面構造の場合
には、樹脂層１８として接着性の特に良好な材料を選択
して用いれば、樹脂層１８と接着層２２を兼用しても良
い。Further, in the case of the double-sided structure as in Example 5, the resin layer 18 and the adhesive layer 22 may be used together by selecting and using a material having particularly good adhesiveness as the resin layer 18.
【００５１】[0051]
【発明の効果】この発明の光磁気記録媒体は、以上説明
したように構成されているので、以下に記載されるよう
な効果を奏する。Since the magneto-optical recording medium of the present invention is constructed as described above, it has the following effects.
【００５２】初期化層を含む記録膜を有する光磁気記録
媒体において記録膜と接し、初期化層の熱を伝達吸収す
ることで初期化層の過熱を防止するような樹脂層を設け
たので、初期化層の磁化反転が抑制され、より高い記録
パワーに対しても信号の劣化を起こすことがなく、広い
範囲の記録パワーで高品質の再生信号を得ることができ
る。Since the magneto-optical recording medium having the recording film including the initialization layer is provided with the resin layer which is in contact with the recording film and prevents the initialization layer from overheating by transmitting and absorbing the heat of the initialization layer, The magnetization reversal of the initialization layer is suppressed, the signal is not deteriorated even at higher recording power, and a high-quality reproduced signal can be obtained with a wide range of recording power.
【００５３】また、同様の理由によって、記録再生を多
数回繰り返しても初期化層の磁化反転が抑制されエラー
の増加を招くことがなく、繰り返し記録再生可能回数が
飛躍的に向上する。For the same reason, even if the recording / reproducing is repeated many times, the magnetization reversal of the initialization layer is suppressed and the error is not increased, and the number of times of repetitive recording / reproducing is dramatically improved.
【００５４】さらに、良好な再生信号品質を保証する記
録パワー幅が広がり、磁性膜の組成、膜厚の製造ばらつ
きに対するマージンが広がり、製造コスト低減の効果が
ある。Further, the recording power width for ensuring good reproduction signal quality is widened, the margin for manufacturing variations in the composition and film thickness of the magnetic film is widened, and the manufacturing cost is reduced.
【００５５】また、この発明の光磁気記録媒体の製造方
法においては、初期化層を含む記録膜の形成後に記録再
生領域以外を金属製のマスクで覆い、記録再生領域に樹
脂層を形成するようにしたので、樹脂層を形成するのに
必要な樹脂の量が少なくて済むとともに、樹脂層の厚さ
およびその形状が安定した外観品質が得られる効果があ
る。In the method of manufacturing the magneto-optical recording medium of the present invention, after forming the recording film including the initialization layer, the area other than the recording / reproducing area is covered with a metal mask to form the resin layer in the recording / reproducing area. As a result, the amount of resin required to form the resin layer can be reduced, and the thickness and shape of the resin layer are stable and the appearance quality can be obtained.
【図１】この発明の実施例１による光磁気記録媒体の断
面図である。FIG. 1 is a sectional view of a magneto-optical recording medium according to a first embodiment of the present invention.
【図２】この発明の実施例１による光磁気記録媒体のＣ
／Ｎ比の記録パワーＰHIGHに対する依存性を示す説明図
である。FIG. 2 C of the magneto-optical recording medium according to Example 1 of the present invention
It is explanatory drawing which shows the dependency of the / N ratio on the recording power P HIGH .
【図３】この発明の実施例１による光磁気記録媒体のビ
ットエラーレートの繰り返し記録再生回数に対する依存
性を示す説明図である。FIG. 3 is an explanatory diagram showing the dependence of the bit error rate of the magneto-optical recording medium according to Example 1 of the present invention on the number of times of repeated recording and reproduction.
【図４】この発明の実施例２による光磁気記録媒体の製
造方法を説明するための断面図である。FIG. 4 is a sectional view for explaining a method for manufacturing a magneto-optical recording medium according to a second embodiment of the present invention.
【図５】この発明の実施例２による光磁気記録媒体の製
造方法における樹脂層を形成する工程を説明するための
断面図である。FIG. 5 is a cross-sectional view for explaining a step of forming a resin layer in the method of manufacturing the magneto-optical recording medium according to the second embodiment of the present invention.
【図６】この発明の実施例３による光磁気記録媒体の製
造方法を説明するための断面図である。FIG. 6 is a sectional view for explaining a method for manufacturing a magneto-optical recording medium according to a third embodiment of the present invention.
【図７】この発明の実施例４による光磁気記録媒体の断
面図である。FIG. 7 is a sectional view of a magneto-optical recording medium according to Example 4 of the present invention.
【図８】この発明の実施例５による光磁気記録媒体の製
造方法を説明するための断面図である。FIG. 8 is a sectional view for explaining a method for manufacturing a magneto-optical recording medium according to a fifth embodiment of the present invention.
【図９】この発明の実施例６による光磁気記録媒体の製
造方法を説明するための断面図である。FIG. 9 is a sectional view for explaining a method for manufacturing a magneto-optical recording medium according to a sixth embodiment of the present invention.
【図１０】この発明の実施例７による光磁気記録媒体の
製造方法を説明するための断面図である。FIG. 10 is a sectional view for explaining the method for manufacturing the magneto-optical recording medium according to the seventh embodiment of the present invention.
【図１１】この発明の実施例８による光磁気記録媒体の
製造方法を説明するための断面図である。FIG. 11 is a cross-sectional view for explaining the method of manufacturing the magneto-optical recording medium according to the eighth embodiment of the present invention.
【図１２】従来の光磁気記録媒体の部分断面図である。FIG. 12 is a partial cross-sectional view of a conventional magneto-optical recording medium.
【図１３】光変調ダイレクト・オーバライトのメカニズ
ムを説明するためのある温度での遷移金属副格子磁化方
向の説明図である。FIG. 13 is an explanatory diagram of a transition metal sublattice magnetization direction at a certain temperature for explaining a mechanism of light modulation direct overwrite.
【図１４】同上光変調ダイレクト・オーバーライトのメ
カニズムを説明するための記録時と再生時の３値変調さ
れた光ビームの光強度の説明図である。FIG. 14 is an explanatory diagram of the light intensity of a ternary-modulated light beam at the time of recording and reproduction for explaining the mechanism of the light modulation direct overwrite.
【図１５】従来の記録媒体のＣ／Ｎ比の記録パワーＰ
HIGHに対する依存性を示す説明図である。FIG. 15 is a recording power P of C / N ratio of a conventional recording medium.
It is explanatory drawing which shows the dependency with respect to HIGH .
【図１６】従来の記録媒体のビットエラーレートの繰り
返し記録再生回数に対する依存性を示す説明図である。FIG. 16 is an explanatory diagram showing the dependence of the bit error rate of a conventional recording medium on the number of times of repeated recording and reproduction.
１３ 透明基板 １４ 第１磁性層 １５ 第２磁性層 １６ 第３磁性層 １７ 初期化層（第４磁性層） １８ 樹脂層 １８ａ 樹脂層 １９ マスク ２０ 金属薄膜層 ２１ 誘電体層 ２２ 接着層 13 transparent substrate 14 first magnetic layer 15 second magnetic layer 16 third magnetic layer 17 initialization layer (fourth magnetic layer) 18 resin layer 18a resin layer 19 mask 20 metal thin film layer 21 dielectric layer 22 adhesive layer
─────────────────────────────────────────────────────
─────────────────────────────────────────────────── ───
【手続補正書】[Procedure amendment]
【提出日】平成４年９月２４日[Submission date] September 24, 1992
【手続補正１】[Procedure Amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】特許請求の範囲[Name of item to be amended] Claims
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【特許請求の範囲】[Claims]
【手続補正２】[Procedure Amendment 2]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００１１[Correction target item name] 0011
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【００１１】また、図１６は繰り返し記録再生を行なっ
たときの再生信号のビットエラーレートの繰り返し記録
再生回数に対する依存性である。繰り返し記録回数が１
×１０4 回を越える付近から、ビットエラーレートの増
大が見られる。エラーが増大した光磁気記録媒体の初期
化層７の磁化が反転していることが確かめられた。この
場合は、１回の記録再生では問題にならない初期化層の
磁化方向の反転またはゆらぎが繰り返し記録再生によっ
て拡大され、エラーの増加につながる程の初期化層７の
磁化反転を引き起こしたものと考えられる。FIG. 16 shows the dependence of the bit error rate of the reproduced signal upon the repeated recording / reproduction on the number of times of the repeated recording / reproduction. Number of repeated recordings is 1
An increase in the bit error rate is seen from around x10 4 times. It was confirmed that the magnetization of the initialization layer 7 of the magneto-optical recording medium with increased error was reversed. In this case, magnified by repeatedly magnetization reversal of the direction of or fluctuations in the initializing layer is not problematic records played on one recording reproducing causes magnetization reversal of enough for initializing layer 7 which leads to an increase in the error It is believed that
【手続補正３】[Procedure 3]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００１５[Correction target item name] 0015
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【００１５】また、この発明に係る光磁気記録媒体の製
造方法は、透明基板上に第１磁性層から第３磁性層およ
び初期化層の４層を順次積層して記録膜を形成する工程
と、初期化層の記録再生領域以外を金属製のマスクで覆
って記録再生領域に樹脂を塗布して紫外線の照射により
硬化させて第１樹脂層を形成する工程を導入したもので
ある。[0015] A method of manufacturing a magneto-optical recording medium according to the invention, the step of forming sequentially stacking a recording layer of four layers of the third magnetic layer and the initializing layer from the first magnetic layer to the transparency substrate Then, a step of forming a first resin layer by covering a region other than the recording / reproducing region of the initialization layer with a metal mask and applying a resin to the recording / reproducing region and curing the resin by irradiation of ultraviolet rays is introduced.
【手続補正４】[Procedure amendment 4]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００２２[Name of item to be corrected] 0022
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【００２２】[0022]
【作用】この発明における光磁気記録媒体においては、
初期化層を含む記録膜に接して基板と逆側に樹脂層を設
けたことによって記録時の集光ビームによる初期化層の
熱が樹脂層に吸収されて初期化層の過熱が抑制され、初
期化層の磁化反転を防止することができ、その結果とし
て、高い記録パワーまで信号の劣化を引き起こすことな
く、記録再生が行え、また繰り返し記録再生可能回数の
飛躍的な増大がもたらされる。In the magneto-optical recording medium according to the present invention,
By providing the resin layer on the side opposite to the substrate in contact with the recording film including the initialization layer, the heat of the initialization layer due to the focused beam at the time of recording is absorbed by the resin layer and the overheating of the initialization layer is suppressed. The magnetization reversal of the initialization layer can be prevented, and as a result, recording / reproduction can be performed up to high recording power without causing signal deterioration, and the number of times of repetitive recording / reproduction is dramatically increased.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 堤 和彦 兵庫県尼崎市塚口本町８丁目１番１号 三 菱電機株式会社材料デバイス研究所内 (72)発明者 羽島 一夫 兵庫県尼崎市塚口本町８丁目１番１号 三 菱電機株式会社材料デバイス研究所内 (72)発明者 深見 達也 兵庫県尼崎市塚口本町８丁目１番１号 三 菱電機株式会社材料デバイス研究所内 (72)発明者 川野 裕司 兵庫県尼崎市塚口本町８丁目１番１号 三 菱電機株式会社材料デバイス研究所内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuhiko Tsutsumi 8-1-1 Tsukaguchi Honcho, Amagasaki City, Hyogo Prefecture Sanryu Electric Co., Ltd. Material Devices Research Laboratory (72) Kazuo Hajima Inventor, 8 Tsukaguchi Honcho, Amagasaki City, Hyogo Prefecture No. 1-1 Sanryo Electric Co., Ltd. Material Device Research Center (72) Inventor Tatsuya Fukami 8-1-1 Tsukaguchi Honcho, Amagasaki City, Hyogo Prefecture Sanryo Electric Co., Ltd. Material Device Research Center (72) Inventor Yuji Kawano Hyogo Prefecture 8-1-1 Tsukaguchihonmachi, Amagasaki-shi Sanryo Electric Co., Ltd.
Claims (8)
数の記録膜と、この記録膜の表面に密着して形成された
初期化層と、この初期化層の表面に形成された樹脂層と
を備えた光磁気記録媒体。1. A plurality of recording films formed of a magnetic layer laminated on a transparent substrate, an initialization layer formed in close contact with the surface of the recording film, and a resin layer formed on the surface of the initialization layer. And a magneto-optical recording medium.
磁性層から第３磁性層および初期化層の４層からなる記
録膜を順次マグネトロンスパッタ法により成膜する工程
と、この記録膜の成膜後上記初期化層上の記録再生領域
以外に金属製のマスクで覆って記録再生領域に樹脂をス
ピンコーティングにより塗布した後に紫外線を照射し
て、この樹脂を硬化させて樹脂層を形成する工程とより
なる光磁気記録媒体の製造方法。2. A first recording / reproducing area on a transparent substrate.
A step of sequentially forming a recording film composed of four layers of a magnetic layer to a third magnetic layer and an initialization layer by a magnetron sputtering method, and after forming the recording film, a metal film other than the recording / reproducing area on the initialization layer is formed. A method for manufacturing a magneto-optical recording medium, which comprises a step of coating a resin on the recording / reproducing area by spin coating after irradiating with ultraviolet rays to cure the resin to form a resin layer.
磁性層から第３磁性層および初期化層の４層からなる記
録膜を順次マグネトロンスパッタ法により成膜する工程
と、この記録膜の成膜後上記初期化層上の記録再生領域
以外に金属製のマスクで覆って記録再生領域に第１の樹
脂層をスピンコーティングにより塗布した後に紫外線を
照射してこの第１の樹脂層を硬化させる工程と、この第
１の樹脂層の形成後第２の樹脂層を塗布して硬化させる
工程とよりなる光磁気記録媒体の製造方法。3. A first recording / reproducing area on a transparent substrate.
A step of sequentially forming a recording film composed of four layers of a magnetic layer to a third magnetic layer and an initialization layer by a magnetron sputtering method, and after forming the recording film, a metal film other than the recording / reproducing area on the initialization layer is formed. Coating the first resin layer on the recording / reproducing area by spin coating and then irradiating it with ultraviolet rays to cure the first resin layer; and after the formation of the first resin layer, the second step A method for manufacturing a magneto-optical recording medium, which comprises a step of applying a resin layer and curing the resin layer.
数の記録膜と、この記録膜の表面に密着して形成された
初期化層と、この初期化層の表面に形成された金属薄膜
層と、この金属薄膜層上に形成された誘電体層と、この
誘電体層に形成された樹脂層とを備えた磁気記録媒体。4. A plurality of recording films made of a magnetic layer laminated on a transparent substrate, an initialization layer formed in close contact with the surfaces of the recording films, and a metal thin film formed on the surface of the initialization layer. A magnetic recording medium comprising a layer, a dielectric layer formed on the metal thin film layer, and a resin layer formed on the dielectric layer.
１磁性層から第３磁性層および初期化層の４層からなる
記録膜を順次マグネトロンスパッタ法により成膜する工
程と、この記録膜の成膜後上記初期化層上の記録再生領
域以外に金属製のマスクで覆って記録再生領域に樹脂層
をスピンコーティングにより塗布した後に紫外線を照射
して樹脂層を硬化させる工程と、上記各工程を順次経て
製造された２枚の光磁気記録媒体の上記樹脂層を互いに
向かい合わせて接着層により接合する工程とよりなる光
磁気記録媒体の製造方法。5. A step of sequentially forming a recording film consisting of four layers of a first magnetic layer to a third magnetic layer and an initialization layer on a transparent substrate in a recording / reproducing area by a magnetron sputtering method, and a step of forming the recording film. After the film formation, a step of coating the resin layer on the recording / reproducing area by spin coating, covering the recording / reproducing area other than the recording / reproducing area on the initialization layer, and then irradiating ultraviolet rays to cure the resin layer, and the above steps. A method for manufacturing a magneto-optical recording medium, which comprises the steps of facing the resin layers of two magneto-optical recording media manufactured by sequentially adhering to each other and joining them with an adhesive layer.
磁性層から第３磁性層および初期化層の４層からなる記
録膜を順次マグネトロンスパッタ法により成膜する工程
と、この記録膜の成膜後上記初期化層上の記録再生領域
以外に金属製のマスクで覆って記録再生領域に第１の樹
脂層をスピンコーティングにより塗布した後に紫外線を
照射してこの第１の樹脂層を硬化させる工程と、この第
１の樹脂層の形成後第２の樹脂層を塗布して硬化させる
工程と、上記各工程を順次経て製造された２枚の光磁気
記録媒体の第２の樹脂層を互いに向かい合わせて内周領
域と外周領域に接着層を設けて接合する工程とよりなる
光磁気記録媒体の製造方法。6. A first recording / reproducing area on a transparent substrate.
A step of sequentially forming a recording film composed of four layers of a magnetic layer to a third magnetic layer and an initialization layer by a magnetron sputtering method, and after forming the recording film, a metal film other than the recording / reproducing area on the initialization layer is formed. Coating the first resin layer on the recording / reproducing area by spin coating and then irradiating it with ultraviolet rays to cure the first resin layer; and after the formation of the first resin layer, the second step A step of applying a resin layer and curing the resin layer, and a step of sequentially adhering the second resin layers of the two magneto-optical recording media manufactured through the above steps to each other to form an adhesive layer in the inner peripheral region and the outer peripheral region. A method for manufacturing a magneto-optical recording medium, which comprises a step of joining.
磁性層から第３磁性層および初期化層の４層からなる記
録膜を順次マグネトロンスパッタ法により成膜する工程
と、上記各工程を順次経て製造された２枚の光磁気記録
媒体のそれぞれの上記初期化あるいは一方の上記初期化
に樹脂層を塗布してこの樹脂層が硬化する以前に上記両
光磁気記録媒体の両樹脂層同志または一方の光磁気記録
媒体の樹脂層と他方の光磁気記録媒体の初期化層とを互
いに向かい合わせて圧接する工程とよりなる磁気記録媒
体の製造方法。7. A first recording / reproducing area on a transparent substrate.
A step of sequentially forming a recording film composed of four layers of a magnetic layer to a third magnetic layer and an initialization layer by a magnetron sputtering method, and the above-mentioned two magneto-optical recording media manufactured through the above-mentioned steps. Before the resin layer is hardened by applying a resin layer to the initialization or one of the initializations, both resin layers of the both magneto-optical recording media or the resin layer of one magneto-optical recording medium and the other magneto-optical recording A method of manufacturing a magnetic recording medium, which comprises the step of press-contacting an initialization layer of the medium so as to face each other.
第３磁性層および初期化層の４層からなる記録膜とこの
記録膜上に誘電体層を介して形成された金属薄膜とから
なる２枚の光磁気記録媒体と、この２枚の光磁気記録媒
体の各金属薄膜を互いに向かい合わせてその両者間に介
在されてこの両金属薄膜を接合する樹脂層とを備えた光
磁気記録媒体。8. A recording film comprising four layers of a first magnetic layer to a third magnetic layer and an initialization layer laminated on a transparent substrate, and a metal thin film formed on the recording film via a dielectric layer. A magneto-optical recording medium comprising two magneto-optical recording media and a resin layer for interposing the metal thin films of the two magneto-optical recording media facing each other and interposing the two metal thin films therebetween. recoding media.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4124568A JP2603027B2 (en) | 1992-05-18 | 1992-05-18 | Magneto-optical recording medium |
| US08/209,258 US5547751A (en) | 1992-04-10 | 1994-03-14 | Magneto-optical recording medium and method of manufacturing the same |
| US08/543,517 US5593791A (en) | 1992-04-10 | 1995-10-16 | Magneto-optical recording medium and method of manufacturing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4124568A JP2603027B2 (en) | 1992-05-18 | 1992-05-18 | Magneto-optical recording medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05325277A true JPH05325277A (en) | 1993-12-10 |
| JP2603027B2 JP2603027B2 (en) | 1997-04-23 |
Family
ID=14888705
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4124568A Expired - Lifetime JP2603027B2 (en) | 1992-04-10 | 1992-05-18 | Magneto-optical recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2603027B2 (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5938780A (en) * | 1982-04-10 | 1984-03-02 | Sharp Corp | Magnetooptic storage element |
| JPS61133067A (en) * | 1984-11-30 | 1986-06-20 | Tdk Corp | Optomagnetic recording medium |
| JPH02218034A (en) * | 1989-02-17 | 1990-08-30 | Fuji Photo Film Co Ltd | Both-face recording type magneto-optical disk |
| JPH0312042A (en) * | 1989-06-08 | 1991-01-21 | Nec Home Electron Ltd | Method for resin coating of optical disk |
| JPH0337844A (en) * | 1989-07-05 | 1991-02-19 | Teijin Ltd | Magneto-optical disk |
| JPH03219449A (en) * | 1989-11-14 | 1991-09-26 | Mitsubishi Electric Corp | Magneto-optical recording medium and device |
| JPH0417931A (en) * | 1990-05-10 | 1992-01-22 | Nissan Motor Co Ltd | Simulator for transfer finger |
| JPH04123339A (en) * | 1990-09-13 | 1992-04-23 | Nikon Corp | Overwritable magneto-optical recording medium with high level margin extended |
| JPH04216339A (en) * | 1990-12-14 | 1992-08-06 | Fujitsu Ltd | Magneto-optical recording medium and production thereof |
-
1992
- 1992-05-18 JP JP4124568A patent/JP2603027B2/en not_active Expired - Lifetime
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5938780A (en) * | 1982-04-10 | 1984-03-02 | Sharp Corp | Magnetooptic storage element |
| JPS61133067A (en) * | 1984-11-30 | 1986-06-20 | Tdk Corp | Optomagnetic recording medium |
| JPH02218034A (en) * | 1989-02-17 | 1990-08-30 | Fuji Photo Film Co Ltd | Both-face recording type magneto-optical disk |
| JPH0312042A (en) * | 1989-06-08 | 1991-01-21 | Nec Home Electron Ltd | Method for resin coating of optical disk |
| JPH0337844A (en) * | 1989-07-05 | 1991-02-19 | Teijin Ltd | Magneto-optical disk |
| JPH03219449A (en) * | 1989-11-14 | 1991-09-26 | Mitsubishi Electric Corp | Magneto-optical recording medium and device |
| JPH0417931A (en) * | 1990-05-10 | 1992-01-22 | Nissan Motor Co Ltd | Simulator for transfer finger |
| JPH04123339A (en) * | 1990-09-13 | 1992-04-23 | Nikon Corp | Overwritable magneto-optical recording medium with high level margin extended |
| JPH04216339A (en) * | 1990-12-14 | 1992-08-06 | Fujitsu Ltd | Magneto-optical recording medium and production thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2603027B2 (en) | 1997-04-23 |
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