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1.发明公开Magneto-optical memory medium and reproducing method thereof 失效Magnetooptisches Speichermedium unddazugehörigesWiedergabeverfahren
公开(公告)号：EP1422708A1
公开(公告)日：2004-05-26
申请号：EP04003323.5
申请日：1998-03-06
发明人： Takahashi, Akira , Mieda, Michinobu , Iketani, Naoyasu , Mori, Go , Nakajima, Junsaku , Murakami, Yoshiteru , Hirokane, Junji
IPC分类号： G11B11/105
CPC分类号： G11B11/10584 , G11B11/10515 , G11B11/10586 , G11B11/10593
摘要： A magneto-optical memory medium according to the present invention comprises a reproducing layer, which has in-plane magnetization at room temperature and perpendicular magnetization when heated to above a predetermined temperature by a reproducing light beam; a recording layer, which is magnetostatically coupled to the reproducing layer; and an in-plane magnetized layer, provided adjacent to the recording layer, which has a Curie temperature at the above-mentioned predetermined temperature. In this medium, at temperatures below the predetermined temperature, signals recorded at high density in the recording layer are masked, and the above-mentioned magnetostatic coupling is suppressed, by magnetic masking by the in-plane magnetized layer. At temperatures above the predetermined temperature, however, within a domain forming part of the in-plane magnetized layer, the recording layer and the reproducing layer are magnetostatically coupled, and a recording bit of the recording layer is copied and expanded to a magnetic domain in the reproducing layer. Accordingly, with this medium, by reproducing from an expanded magnetic domain of the reproducing layer, even information from recording bits recorded at high density can be reproduced with high signal quality.
摘要翻译： 根据本发明的磁光存储介质包括再现层，其在室温下具有面内磁化并且通过再现光束被加热到高于预定温度时的垂直磁化; 记录层，其被静磁耦合到再现层; 以及与记录层相邻的面内磁化层，居里温度在上述规定温度。 在该介质中，在低于预定温度的温度下，记录层中以高密度记录的信号被掩蔽，并且通过面内磁化层的磁屏蔽来抑制上述静磁耦合。 然而，在高于预定温度的温度下，在形成面内磁化层的一部分的区域内，磁静电耦合记录层和再现层，并且将记录层的记录位复制并扩展到磁畴 再现层。 因此，利用该介质，通过从再现层的扩展磁畴再现，可以以高信号质量再现以高密度记录的记录位的信息。
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公开(公告)号：EP0539176B1
公开(公告)日：1998-01-28
申请号：EP92309600.2
申请日：1992-10-21
IPC分类号： G11B11/10
CPC分类号： G11B11/10584 , G11B11/10506 , G11B11/10519 , G11B11/10586
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公开(公告)号：EP0234547B1
公开(公告)日：1994-05-25
申请号：EP87102561.5
申请日：1987-02-24
发明人： Hirokane, Junji , Katayama, Hiroyuki , Takahashi, Akira , Inui, Tetsuya , Ohta, Kenji , Washo, Junichi , Miyake, Tomoyuki , Van, Kazuo , Mieda, Michinobu
IPC分类号： G03F1/00
CPC分类号： G03F1/54 , G03F1/68 , G11B7/261 , Y10S430/146
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公开(公告)号：EP0310412B1
公开(公告)日：1994-04-13
申请号：EP88309089.6
申请日：1988-09-30
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5.发明公开Magneto-optical recording medium and manufacturing method thereof 失效Magnetooptisches Aufzeichnungsmedium und Verfahren zu seiner Herstellung。
公开(公告)号：EP0552957A2
公开(公告)日：1993-07-28
申请号：EP93300433.5
申请日：1993-01-21
IPC分类号： G11B11/10
CPC分类号： G11B11/10582 , G11B11/10586
摘要： A magneto-optical recording medium has a recording layer including at least two magnetic layers. The magneto-optical recording medium satisfies a condition of |A₁·K₁ - A₂·K₂|
摘要翻译： 磁光记录介质具有包括至少两个磁性层的记录层。 磁光记录介质满足条件| A1.K1-A2.K2| <2.0（erg2 / cm4），其中A1，K1，A2和K2分别表示第一磁性的交换常数 第一磁性层的垂直磁各向异性，第二磁性层的交换常数和第二磁性层的垂直磁各向异性。 第一和第二磁性层由TbFeCo制成。
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公开(公告)号：EP0539176A3
公开(公告)日：1993-06-09
申请号：EP92309600.2
申请日：1992-10-21
IPC分类号： G11B11/10
CPC分类号： G11B11/10584 , G11B11/10506 , G11B11/10519 , G11B11/10586
摘要： A magneto-optical recording method for rewriting of information including the steps of projecting a light beam, whose intensity varies in response to information to be recorded, onto a magnetic thin film with perpendicular magnetization while an external magnetic field of a constant intensity is being applied thereto; and arranging the magnetization direction of an area irradiated with the light beam of the magnetic thin film with perpendicular magnetization in the direction of the external magnetic field when projecting the light beam of high intensity, while arranging it in the direction of demagnetizing field, opposite to the direction of the external magnetic field generated by magnetization in the vicinity of the irradiated area when projecting the light beam of low intensity, and a magneto-optical memory element provided with a base whereon the magnetic thin film with perpendicular magnetization and an in-plane magnetization film are formed. With the above arrangement, an overwriting operation can be carried out through light intensity modulation without requiring an initialization magnet.
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公开(公告)号：EP0527602A2
公开(公告)日：1993-02-17
申请号：EP92307222.7
申请日：1992-08-07
CPC分类号： G11B7/261 , G11B7/00454 , G11B7/007 , G11B7/0938 , G11B7/24 , G11B7/24079 , G11B7/26 , G11B11/10582
摘要： A transparent substrate of an optical memory is produced by injection molding using a stamper. Grooves and lands are alternately arranged on the optical memory, for tracking of light converged on the optical memory. The groove width is set in the range of 0.3 µm to 0.4 µm and the groove depth is set in the range of 80 nm to 100 nm. A decrease in the width of a land at each edge is restrained to 0.2 µm in maximum. With such dimensions, even when the track pitch is set to about 1.4 µm, it is possible to obtain a track crossing signal with intensity sufficient for performing an access operation to a target track. Moreover, since the dimensions bring about an improved reflectance at a land, the optical memory achieves an improved C/N and recording density.
摘要翻译： 光存储器的透明基板通过使用压模进行注射成型来制造。 光存储器上交替排列凹槽和平台，以跟踪会聚在光存储器上的光。 槽宽度设定在0.3μm至0.4μm的范围内，并且槽深度设定在80nm至100nm的范围内。 每个边缘处的平面宽度的减小最大限制在0.2μm。 利用这样的尺寸，即使当轨道间距设置为大约1.4μm时，也可以获得足够强度的轨道交叉信号以执行对目标轨道的访问操作。 而且，由于尺寸带来了在平台上的改进的反射率，光存储器实现了改进的C / N和记录密度。
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公开(公告)号：EP0228909B1
公开(公告)日：1992-03-11
申请号：EP86310145.7
申请日：1986-12-24
发明人： Murakami, Yoshiteru , Takahashi, Akira , Katayama, Hiroyuki , Ohta, Kenji , Mieda, Michinobu , Miyake, Tomoyuki
CPC分类号： G11B5/64 , G11B11/10586 , Y10S428/90
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公开(公告)号：EP0356201A3
公开(公告)日：1992-01-15
申请号：EP89308499.6
申请日：1989-08-22
发明人： Ohta, Kenji , Inui, Tetsuya , Katayama, Hiroyuki , Takahashi, Akira , Hirokane, Junji , Nishitani, Yukinori , Mieda, Michinobu , Van, Kazuo
CPC分类号： G11B7/0045 , G11B7/0938 , G11B7/126 , G11B7/24 , G11B7/24085 , G11B11/10528 , G11B11/10578 , G11B11/10595 , G11B19/02
摘要： An optical recording element (4) comprising a recording medium which includes an information recording area formed at every unit in a non-continuous condition, the recording medium further including sample (2) pits disposed at intervals of a fixed distance for providing basic information about the locations of the recording units in the same track. Each sample pit comprises a plurality of pits disposed next to the sequence of the recording units so that the spacing between the pits differs from the spacing between the recording units. At least one of the plurality of pits is a long-sized inclined pit which is inclined at an angle in the range of 6° to 80° to a recording track. A driving system for driving the optical recording element for recording information in the non-continuous recording area or erasing information stored therein with a light beam the output of which is varied as required and checking whether said recording or erasing has been correctly performed, within a very short time in which the light beam passes through the non-continuous recording area. By using the optical recording element in combination with its driving system, the processing speed can be greatly improved and the irradiating position of the light beam at every recording unit can be correctly controlled.
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公开(公告)号：EP0317344A3
公开(公告)日：1990-11-28
申请号：EP88310925.8
申请日：1988-11-18
发明人： Deguchi, Toshihisa , Ohta, Kenji , Takahashi, Akira , Van, Kazuo , Mieda, Michinobu , Inui, Tetsuya
CPC分类号： G11B7/0938 , G11B7/00745 , G11B7/24 , G11B7/24085
摘要： An optical memory medium is described comprising prepits (11, 11′) on which a light spot (5) is impinged to obtain information and, if required, guide grooves: each of those (11′) among the prepits (11, 11′) which are longer than the diameter of the light spot (5) consists of a series of pit portions (11a) and unpitted portions (12); each of the prepits (23) is sandwiched between two discontinuous portions (21a) of guide grooves (21) adjacent to each other; the guide grooves (21) have one or more narrow portions (21b), and each of the prepits (23) is sandwiched between two of the narrow portions (21b) of guide grooves (21) adjacent to each other; or the guide grooves (21) have one or more long portions (21h), one or more short portions (21j), and narrow portions (21i) formed between the long (21h) and short (21j) portions, and each of the prepits (23) is sandwiched between two of the short portions (21j) of guide grooves (21) adjacent to each other.
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