-
公开(公告)号：EP0428128A2
公开(公告)日：1991-05-22
申请号：EP90121683.8
申请日：1990-11-13
IPC分类号： G11B11/10
CPC分类号： G11B11/10523 , G11B11/10506 , G11B11/10515 , G11B11/10519 , G11B11/10586 , Y10T428/265
摘要： A magneto-optical recording medium having a substrate (1) and a magnetic layer composed of at least a recording layer (3) and a supporting layer (4) and being capable of retrieving information by utilizing the fact that when it is irradiated with a laser beam it produces the magneto-optical effect which affects its reflected light, characterized in that the recording layer (3) has a lower Curie temperature than has the supporting layer (4) and the recording layer (3) is thin enough for the laser beam to pass through.
A magneto-optical recording medium as defined above, wherein the supporting layer (4) is composed of a first supporting layer and a second supporting layer, and the recording layer (3), the first supporting layer, and the second supporting layer have Curie temperatures of T₁, T₂, and T₃, respectively, which satisfy the following relationship.
T₁
A magneto-optical recording medium defined as above, wherein the recording layer (3) has a higher Curie temperature than has the supporting layer (4).
Owing to the above-mentioned features, the magneto-optical recording media of the present invention are capable of overwriting and have improved recording sensitivity.摘要翻译： 一种磁光记录介质，具有基板（1）和由至少记录层（3）和支撑层（4）构成的磁性层，并且能够通过利用以下事实来检索信息： 激光束产生影响其反射光的磁光效应，其特征在于记录层（3）具有比支撑层（4）更低的居里温度，并且记录层（3）对于激光器足够薄 光束通过。 如上所述的磁光记录介质，其中所述支撑层（4）由第一支撑层和第二支撑层构成，并且所述记录层（3），所述第一支撑层和所述第二支撑层具有居里 分别满足以下关系的T1，T2和T3的温度。 T1
/ = T3如上定义的磁光记录介质，其中记录层（3）具有比具有支撑层（4）的更高的居里温度。 由于上述特征，本发明的磁光记录介质能够重写并具有提高的记录灵敏度。 -
公开(公告)号：EP0428128A3
公开(公告)日：1992-10-21
申请号：EP90121683.8
申请日：1990-11-13
IPC分类号： G11B11/10
CPC分类号： G11B11/10523 , G11B11/10506 , G11B11/10515 , G11B11/10519 , G11B11/10586 , Y10T428/265
摘要： A magneto-optical recording medium having a substrate (1) and a magnetic layer composed of at least a recording layer (3) and a supporting layer (4) and being capable of retrieving information by utilizing the fact that when it is irradiated with a laser beam it produces the magneto-optical effect which affects its reflected light, characterized in that the recording layer (3) has a lower Curie temperature than has the supporting layer (4) and the recording layer (3) is thin enough for the laser beam to pass through. A magneto-optical recording medium as defined above, wherein the supporting layer (4) is composed of a first supporting layer and a second supporting layer, and the recording layer (3), the first supporting layer, and the second supporting layer have Curie temperatures of T₁, T₂, and T₃, respectively, which satisfy the following relationship.
T₁ A magneto-optical recording medium defined as above, wherein the recording layer (3) has a higher Curie temperature than has the supporting layer (4). Owing to the above-mentioned features, the magneto-optical recording media of the present invention are capable of overwriting and have improved recording sensitivity.摘要翻译： 一种磁光记录媒体，它具有基片（1）和至少由记录层（3）和支持层（4）构成的磁性层，并且能够利用这样的事实来检索信息，即当它被照射 激光束产生影响其反射光的磁光效应，其特征在于记录层（3）具有比支撑层（4）低的居里温度，并且记录层（3）对于激光来说足够薄 光束通过。 一种如上定义的磁光记录介质，其中支撑层（4）由第一支撑层和第二支撑层组成，并且记录层（3），第一支撑层和第二支撑层具有居里 温度T 1，T 2和T 3分别满足以下关系。 T 1
-
3.发明公开Magneto-optical recording/reproducing apparatus and method 审中-公开Gerätund Verfahren zur magneto-optischen Aufzeichnung / Wiedergabe
公开(公告)号：EP0910077A2
公开(公告)日：1999-04-21
申请号：EP98119496.2
申请日：1998-10-15
申请人： HITACHI, LTD. , SONY CORPORATION , SHARP KABUSHIKI KAISHA , OLYMPUS OPTICAL CO., LTD. , SANYO ELECTRIC Co., Ltd. , FUJITSU LIMITED , HITACHI MAXELL, LTD.
发明人： Tanaka, Yasuhito , Kurebayashi, Masaaki , Maeda, Takeshi , Watanabe, Hitoshi , Watanabe, Tetsu , Maeda, Shigemi , Sumi, Satoshi , Matsubayashi, Nobuhide , Matsuura, Michio
IPC分类号： G11B11/10
CPC分类号： G11B7/126 , G11B7/094 , G11B7/0941 , G11B7/0945 , G11B7/0956 , G11B11/10515 , G11B11/10576 , G11B11/10595
摘要： A magneto-optical information recording/reproducing apparatus in which a magneto-optical information recording medium (1) at least including a first magnetic film having magneto-optical information recorded on a track and having perpendicular magnetic anisotropy, and a second magnetic film to which the magneto-optical information recorded on the first magnetic film is transferred by irradiation of a laser beam, is used so that a readout laser beam is irradiated onto the second magnetic film to thereby readout the magneto-optical information transferred to the second magnetic film. The apparatus includes a 2-split detection circuit (18) constituted by two detection elements (18a, 18b) for receiving the readout laser beam reflected from the second magnetic film of the magneto-optical information recording medium, and a subtraction circuit (19) in which output signals of the two detection elements of the 2-split detection circuit having levels corresponding to the quantities of light received by the two detection elements respectively are subtracted from each other to generate a differential signal expressing the difference between the output signals. The apparatus further comprises a circuit (22, 23) for making a spot of the laser beam jump one track before readout of the magneto-optical information from the magneto-optical information recording medium, a positive/negative balance correction circuit (20) for detecting an amplitude ratio between positive and negative side amplitudes in a track jump signal generated in the differential signal from the subtraction circuit in response to the track jump to thereby output a correction signal in accordance with the amplitude ratio, and an addition circuit (21) for adding the correction signal to the differential signal to thereby generate a tracking error signal for tracking control used in readout of the magneto-optical information from the magneto-optical information recording medium.
摘要翻译： 一种磁光信息记录/再现装置，其中至少包括记录在轨道上并具有垂直磁各向异性的磁光信息的第一磁膜的磁光信息记录介质（1）和第二磁膜， 记录在第一磁性膜上的磁光信息通过激光束的照射被传送，使得读出的激光束照射到第二磁性膜上，从而读出传递到第二磁性膜的磁光信息。 该装置包括由用于接收从磁光信息记录介质的第二磁膜反射的读出激光束的两个检测元件（18a，18b）和减法电路（19）构成的二分割检测电路（18） 其中分离检测电路的两个检测元件的输出信号分别相应于由两个检测元件接收的光量的电平，以产生表示输出信号之间的差的差分信号。 该装置还包括一个电路（22,23），用于在从磁光信息记录介质读出磁光信息之前使激光束的点跳跃到一个磁道;正/负平衡校正电路（20），用于 检测来自所述减法电路的差分信号中产生的磁道跳转信号中的正负振幅之间的振幅比，以响应于所述磁道跳跃，从而根据所述振幅比输出校正信号，以及加法电路（21） 用于将校正信号添加到差分信号，从而生成用于跟踪来自磁光信息记录介质的磁光信息读出中使用的控制的跟踪误差信号。
-
公开(公告)号：EP0428128B1
公开(公告)日：1999-02-03
申请号：EP90121683.8
申请日：1990-11-13
IPC分类号： G11B11/10
CPC分类号： G11B11/10523 , G11B11/10506 , G11B11/10515 , G11B11/10519 , G11B11/10586 , Y10T428/265
-
公开(公告)号：EP0222183A2
公开(公告)日：1987-05-20
申请号：EP86114142.2
申请日：1986-10-13
申请人： HITACHI, LTD.
发明人： Yamada, Masamichi , Kurebayashi, Masaaki , Saito, Masakatsu , Yanagihara, Hitoshi , Konishi, Katsuo , Tsuchiya, Toshio
CPC分类号： G11B5/3116 , G11B5/31 , G11B5/3143
摘要： In a thin film magnetic head consisting of a non-magnetic substrate (I), and a multilayer structure superposed thereon and including a lower core (2), a gap material layer (II), a thin film coil (13) and an upper core (6), etc., the head sliding surface of the lower core (2) and that of the upper core (6) are so formed that they become wider with increasing distance from the surface of the gap material layer (II).
-
公开(公告)号：EP0910077A3
公开(公告)日：2002-01-16
申请号：EP98119496.2
申请日：1998-10-15
申请人： Hitachi, Ltd. , SONY CORPORATION , SHARP KABUSHIKI KAISHA , OLYMPUS OPTICAL CO., LTD. , SANYO ELECTRIC Co., Ltd. , FUJITSU LIMITED , HITACHI MAXELL, LTD.
发明人： Tanaka, Yasuhito , Kurebayashi, Masaaki , Maeda, Takeshi , Watanabe, Hitoshi , Watanabe, Tetsu , Maeda, Shigemi , Sumi, Satoshi , Matsubayashi, Nobuhide , Matsuura, Michio
IPC分类号： G11B11/10
CPC分类号： G11B7/126 , G11B7/094 , G11B7/0941 , G11B7/0945 , G11B7/0956 , G11B11/10515 , G11B11/10576 , G11B11/10595
摘要： A magneto-optical information recording/reproducing apparatus in which a magneto-optical information recording medium (1) at least including a first magnetic film having magneto-optical information recorded on a track and having perpendicular magnetic anisotropy, and a second magnetic film to which the magneto-optical information recorded on the first magnetic film is transferred by irradiation of a laser beam, is used so that a readout laser beam is irradiated onto the second magnetic film to thereby readout the magneto-optical information transferred to the second magnetic film. The apparatus includes a 2-split detection circuit (18) constituted by two detection elements (18a, 18b) for receiving the readout laser beam reflected from the second magnetic film of the magneto-optical information recording medium, and a subtraction circuit (19) in which output signals of the two detection elements of the 2-split detection circuit having levels corresponding to the quantities of light received by the two detection elements respectively are subtracted from each other to generate a differential signal expressing the difference between the output signals. The apparatus further comprises a circuit (22, 23) for making a spot of the laser beam jump one track before readout of the magneto-optical information from the magneto-optical information recording medium, a positive/negative balance correction circuit (20) for detecting an amplitude ratio between positive and negative side amplitudes in a track jump signal generated in the differential signal from the subtraction circuit in response to the track jump to thereby output a correction signal in accordance with the amplitude ratio, and an addition circuit (21) for adding the correction signal to the differential signal to thereby generate a tracking error signal for tracking control used in readout of the magneto-optical information from the magneto-optical information recording medium.
-
公开(公告)号：EP0222183B1
公开(公告)日：1994-01-12
申请号：EP86114142.2
申请日：1986-10-13
申请人： HITACHI, LTD.
发明人： Yamada, Masamichi , Kurebayashi, Masaaki , Saito, Masakatsu , Yanagihara, Hitoshi , Konishi, Katsuo , Tsuchiya, Toshio
CPC分类号： G11B5/3116 , G11B5/31 , G11B5/3143
-
-
-
-
-
-
搜索结果
7 条记录 (耗时 0.009 秒)
