公开(公告)号：US06483783B1

公开(公告)日：2002-11-19

申请号：US09713034

申请日：2000-11-16

申请人： Kenichiro Mitani ,  Naoyuki Takagi ,  Hitoshi Noguchi ,  Hiroki Ishida ,  Atsushi Yamaguchi ,  Morio Nakatani

发明人： Kenichiro Mitani ,  Naoyuki Takagi ,  Hitoshi Noguchi ,  Hiroki Ishida ,  Atsushi Yamaguchi ,  Morio Nakatani

IPC分类号： G11B1100

CPC分类号： G11B11/10595 ,  G11B11/10515 ,  G11B11/10543 ,  G11B11/1055

摘要： A magnetic head is configured of a core and a coil wound around the core and passing current through the coil in a variable direction allows the core to have an edge generating an alternating magnetic field Hex1 and another edge generating an alternating magnetic field Hex2. Alternating magnetic fields Hex1 and Hex2 are applied to the respective edges. Furthermore, a laser beam LB1 is directed such that its optical axis L01 matches the edge receiving the alternating magnetic field Hex1, and a laser beam LB2 is directed such that its optical axis L02 matches the edge receiving the alternating magnetic field Hex2. A first magneto-optical signal detected through the alternating magnetic field Hex1 and the laser beam LB1 and a second magneto-optical signal detected through the alternating magnetic field Hex2 and the laser beam LB2 are composited together. As such, an alternating magnetic field can be applied to a magneto-optical recording medium at a predetermined angle to an in-plane direction of the recording medium to accurately enlarge a magnetic domains for reproduction.

摘要翻译： 磁头由铁芯和缠绕在磁芯上的线圈构成，并且使电流沿可变方向通过线圈允许磁芯具有产生交变磁场Hex1的边缘，另一边产生交变磁场Hex2。 交替磁场Hex1和Hex2被施加到相应的边缘。 此外，激光束LB1被引导为使得其光轴L01与接收交变磁场Hex1的边缘匹配，并且激光束LB2被引导为使得其光轴L02与接收交变磁场Hex2的边缘匹配。 通过交变磁场Hex1和激光束LB1检测到的第一磁光信号和通过交变磁场Hex2和激光束LB2检测的第二磁光信号被合成在一起。 这样，可以将交变磁场以与记录介质的面内方向成预定角度的方式施加到磁光记录介质，以精确地放大用于再现的磁畴。

公开(公告)号：US06295253B1

公开(公告)日：2001-09-25

申请号：US09666549

申请日：2000-09-21

申请人： Kenichiro Mitani ,  Naoyuki Takagi ,  Hitoshi Noguchi ,  Atsushi Yamaguchi ,  Hiroki Ishida

发明人： Kenichiro Mitani ,  Naoyuki Takagi ,  Hitoshi Noguchi ,  Atsushi Yamaguchi ,  Hiroki Ishida

IPC分类号： G11B1100

CPC分类号： G11B20/10 ,  G11B11/1051 ,  G11B11/10515 ,  G11B11/10534 ,  G11B11/1055 ,  G11B27/19 ,  G11B27/24 ,  G11B2220/2525

摘要： When recording a recorded signal consisting of “01011001110” in a magnetooptical recording medium, (1,1) corresponding to a domain of 2T is converted to (1,0,1), and (0,0) is converted to (0,1,0) in the recorded signal. In other words, the first “1” of (1,1) is converted to unit bits “1,0” and the first “0” of (0,0) is converted to unit bits “0,1”. Similarly, the first “1” of (1,1,1) corresponding to a domain of 3T is converted to unit bits “1,0”, and the second “1” is converted to unit bits “1,0”. “1” or “0” of the final unit bit is not converted but recorded as such. Consequently, a signal can be correctly reproduced by extension ally transferring domains having different domain lengths from a recording layer to a reproducing layer under the same reproducing conditions.

摘要翻译： 当在磁光记录介质中记录由“01011001110”组成的记录信号时，对应于2T的域的（1,1）被转换为（1,0,1），（0,0）被转换为（0， 1,0）记录信号。 换句话说，（1,1）的第一个“1”被转换为单位比特“1,0”，（0,0）的第一个“0”被转换为单位比特“0,1”。 类似地，对应于3T的域的（1,1,1）的第一“1”被转换为单位比特“1,0”，第二“1”被转换为单位比特“1,0”。 最终单位位的“1”或“0”不转换而是被记录。 因此，通过在相同的再现条件下将具有不同域长度的域从记录层延伸到再现层，可以正确地再现信号。

公开(公告)号：US06492035B1

公开(公告)日：2002-12-10

申请号：US09530497

申请日：2000-05-01

申请人： Atsushi Yamaguchi ,  Naoyuki Takagi ,  Kenichiro Mitani ,  Hitoshi Noguchi

发明人： Atsushi Yamaguchi ,  Naoyuki Takagi ,  Kenichiro Mitani ,  Hitoshi Noguchi

IPC分类号： G11B11105

CPC分类号： G11B11/10586 ,  G11B11/10515 ,  G11B11/10584 ,  Y10T428/12465 ,  Y10T428/12861 ,  Y10T428/24942

摘要： A magneto-optical recording medium of magnetic domain enlarging/reproducing system including a recording layer and a reproducing layer, a gate layer selectively extracting each magnetic domain within the recording layer is formed on the recording layer, a magnetic field reinforcement layer reinforcing a leakage magnetic field reaching the reproducing layer is formed on the gate layer, and a blocking layer blocking an exchange coupling force from the magnetic field reinforcement layer to the reproducing layer is formed on the magnetic field reinforcement layer.

摘要翻译： 一种包括记录层和再现层的磁畴扩大/再现系统的磁光记录介质，在记录层上形成选择性地提取记录层内的每个磁畴的栅极层，加强漏磁 在栅极层上形成到达再现层的场，并且在磁场强化层上形成阻挡从磁场强化层到再生层的交换耦合力的阻挡层。

公开(公告)号：US06650599B2

公开(公告)日：2003-11-18

申请号：US09922836

申请日：2001-08-07

申请人： Naoyuki Takagi ,  Atsushi Yamaguchi ,  Kenichiro Mitani

发明人： Naoyuki Takagi ,  Atsushi Yamaguchi ,  Kenichiro Mitani

IPC分类号： G11B1100

CPC分类号： G11B7/126 ,  G11B11/10515 ,  G11B11/10595

摘要： A reproducing apparatus reproduces a signal recorded in a magneto-optical disk. The magneto-optical disk includes a layered structure having a recording layer, an intermediate layer and a reproducing layer. Laser light is illuminated from an optical head to the magneto-optical disk in such an intensity that no magnetic domain is transferred from the recording layer to the reproducing layer only by the laser light. In this state, alternating magnetic field is applied through a magnetic head to the magneto-optical disk, thereby concurrently causing transfer and expansion of a magnetic domain to the reproducing layer. As a result, transfer of the magnetic domain is effected with expansion.

摘要翻译： 再现装置再现记录在磁光盘中的信号。 磁光盘包括具有记录层，中间层和再现层的分层结构。 激光从光头照射到磁 - 光盘，其强度使得只有通过激光将磁畴从记录层转移到再现层。 在这种状态下，通过磁头向磁光盘施加交变磁场，从而同时引起磁畴向再现层的转移和扩展。 结果，扩大了磁畴的转移。

公开(公告)号：US06388955B1

公开(公告)日：2002-05-14

申请号：US09381498

申请日：1999-09-22

申请人： Naoyuki Takagi ,  Atsushi Yamaguchi ,  Kenichiro Mitani

发明人： Naoyuki Takagi ,  Atsushi Yamaguchi ,  Kenichiro Mitani

IPC分类号： G11B1100

CPC分类号： G11B7/126 ,  G11B11/10515 ,  G11B11/10595

摘要： A reproducing apparatus reproduces a signal recorded in a magneto-optical disk. The magneto-optical disk includes a layered structure having a recording layer, an intermediate layer and a reproducing layer. Laser light is illuminated from an optical head to the magneto-optical disk in such an intensity that no magnetic domain is transferred from the recording layer to the reproducing layer only by the laser light. In this state, alternating magnetic field is applied through a magnetic head to the magneto-optical disk, thereby concurrently causing transfer and expansion of a magnetic domain to the reproducing layer. As a result, transfer of the magnetic domain is effected with expansion.

摘要翻译： 再现装置再现记录在磁光盘中的信号。 磁光盘包括具有记录层，中间层和再现层的分层结构。 激光从光头照射到磁 - 光盘，其强度使得只有通过激光将磁畴从记录层转移到再现层。 在这种状态下，通过磁头向磁光盘施加交变磁场，从而同时引起磁畴向再现层的转移和扩展。 结果，扩大了磁畴的转移。

公开(公告)号：US20050064131A1

公开(公告)日：2005-03-24

申请号：US10943240

申请日：2004-09-17

申请人： Atsushi Yamaguchi ,  Hitoshi Noguchi ,  Shinji Kobayashi ,  Yoshihisa Suzuki ,  Morio Nakatani ,  Masahiro Higuchi ,  Yoshiaki Maeno

发明人： Atsushi Yamaguchi ,  Hitoshi Noguchi ,  Shinji Kobayashi ,  Yoshihisa Suzuki ,  Morio Nakatani ,  Masahiro Higuchi ,  Yoshiaki Maeno

IPC分类号： C08L101/16 ,  G11B7/004 ,  G11B7/005 ,  G11B7/007 ,  G11B7/243 ,  G11B7/245 ,  G11B7/251 ,  G11B7/253 ,  G11B7/254 ,  G11B7/257 ,  G11B7/258 ,  B32B3/02

CPC分类号： G11B7/2539 ,  G11B7/0053 ,  G11B7/00736 ,  G11B7/243 ,  G11B7/245 ,  G11B7/251 ,  G11B7/254 ,  G11B7/257 ,  G11B7/258

摘要： The present invention provides smooth and adequate recording/reproducing on a recording medium employing a biodegradable material as a substrate material. The present invention relates to storing on a recording medium, information, structure, or the like indicating that a substrate is formed of a biodegradable material. When the present invention is applied to CD, CD-R, and CD-RW, identification information indicating a substrate formed of a biodegradable material is included in a free area of TOC data in a lead-in area shown in FIG. 4. An optical disc apparatus reads the identification information to identify whether or not a disc loaded into the apparatus has a substrate of a biodegradable material. When the loaded disc has a substrate of a biodegradable material, the optical disc apparatus: measures a temperature inside a drive; stops a recording/reproducing operation on the disc when the temperature approaches a glass transition temperature of a substrate material; and ejects the disc to outside of the apparatus.

摘要翻译： 本发明在使用可生物降解材料作为基材的记录介质上提供平滑和充分的记录/再现。 本发明涉及在记录介质上存储表示基材由可生物降解的材料形成的信息，结构等。 当将本发明应用于CD，CD-R和CD-RW时，指示由可生物降解材料形成的衬底的识别信息被包括在图1所示导入区的TOC数据的空闲区域中。 光盘装置读取识别信息以识别装载到该装置中的盘是否具有可生物降解材料的基底。 当装载的盘具有可生物降解材料的基底时，光盘装置：测量驱动器内部的温度; 当温度接近基板材料的玻璃化转变温度时，停止盘上的记录/再现操作; 并将盘弹出到设备外部。

公开(公告)号：US06590836B1

公开(公告)日：2003-07-08

申请号：US09669454

申请日：2000-09-25

申请人： Atsushi Yamaguchi ,  Hitoshi Noguchi ,  Hiroki Ishida

发明人： Atsushi Yamaguchi ,  Hitoshi Noguchi ,  Hiroki Ishida

IPC分类号： G11B1100

CPC分类号： G11B11/10593 ,  G11B11/10582 ,  G11B11/10584

摘要： On a dielectric layer of SiN a reproduction layer, a non-magnetic layer of SiN and a recording layer of TbFeCo are formed to provide a magneto optical recording medium. The reproduction layer is formed of a first layer corresponding to a Gd layer, a second layer formed of GdFeCo and a third layer corresponding to a Gd layer. As such, the magneto optical recording medium, with the non-magnetic layer formed in contact with the reproduction layer, can prevent the non-magnetic layer from affecting the reproduction layer and thus prevent the reproduction layer from having a degraded characteristic.

摘要翻译： 在SiN的介质层上形成再生层，形成SiN的非磁性层和TbFeCo的记录层，以提供磁光记录介质。 再现层由对应于Gd层的第一层，由GdFeCo形成的第二层和对应于Gd层的第三层形成。 因此，具有与再现层接触的非磁性层的磁光记录介质可以防止非磁性层影响再现层，从而防止再现层具有劣化的特性。

公开(公告)号：US06370089B1

公开(公告)日：2002-04-09

申请号：US09208853

申请日：1998-12-10

申请人： Atsushi Yamaguchi ,  Kenichiro Mitani

发明人： Atsushi Yamaguchi ,  Kenichiro Mitani

IPC分类号： G11B1100

CPC分类号： G11B11/10586 ,  G11B11/10515

摘要： A magneto-optical recording medium including a substrate, a reproducing layer formed on the substrate, an intermediate layer formed on the reproducing layer, a recording layer formed on the intermediate layer and a high magnetization layer formed on the recording layer. The intermediate layer is made of a non-magnetic material, and set at a prescribed thickness so that a leakage magnetic field from the recording layer to the reproducing layer is so distributed that the intensity thereof is increased from an end to the center of its domain. The high magnetization layer is made of an alloy or a multilayer film of a noble metal and a transition metal having saturation magnetization stronger than that of the recording layer under a reproducing temperature. At room temperature, the coercive force of the recording layer is larger than that of the high magnetization layer. Consequently, transfer/enlargement from the recording layer to the reproducing layer is readily caused in this magneto-optical recording medium.

摘要翻译： 包括基板，形成在基板上的再现层，形成在再现层上的中间层，形成在中间层上的记录层和形成在记录层上的高磁化层的磁光记录介质。 中间层由非磁性材料制成，并且设定为规定的厚度，使得从记录层到再现层的泄漏磁场如此分布，使得其强度从其端部到其中心部分增加 。 高磁化层由在再生温度下具有比记录层的饱和磁化强度更高的贵金属和过渡金属的合金或多层膜制成。 在室温下，记录层的矫顽力大于高磁化层的矫顽力。 因此，在该磁光记录介质中容易引起从记录层到再现层的传送/放大。

公开(公告)号：US06847590B2

公开(公告)日：2005-01-25

申请号：US09931080

申请日：2001-08-17

申请人： Atsushi Yamaguchi ,  Naoyuki Takagi ,  Yoshiharu Uchihara ,  Satoshi Sumi ,  Hiroyuki Awano ,  Hiroshi Shirai ,  Hitoshi Watanabe ,  Norio Ohta

发明人： Atsushi Yamaguchi ,  Naoyuki Takagi ,  Yoshiharu Uchihara ,  Satoshi Sumi ,  Hiroyuki Awano ,  Hiroshi Shirai ,  Hitoshi Watanabe ,  Norio Ohta

IPC分类号： G11B7/007 ,  G11B7/013 ,  G11B11/105 ,  G11B11/00

CPC分类号： G11B11/10595 ,  G11B7/00736 ,  G11B7/24085 ,  G11B11/10515 ,  G11B11/10584

摘要： A magneto-optical recording medium which includes a reproducing layer. When a laser beam is irradiated to the magneto-optical recording medium, a magnetic domain in a recording layer is transferred, through enlargement, to a reproducing layer increased in temperature. The magneto-optical recording medium further includes a calibration area that has a calibration magnetic domain recorded in a predetermined pattern in the recording layer. In a reproducing apparatus, a laser beam of an optical head is adjusted in output depending upon a reproduced signal obtained by reproducing the calibration magnetic domain.

摘要翻译： 一种磁光记录介质，包括再现层。 当激光束照射到磁光记录介质时，记录层中的磁畴通过放大转移到温度升高的再生层。 磁光记录介质还包括具有以记录层中的预定图案记录的校准磁畴的校准区域。 在再现装置中，根据通过再现校准磁畴获得的再现信号，调节光学头的激光束的输出。

公开(公告)号：US06697304B2

公开(公告)日：2004-02-24

申请号：US10247691

申请日：2002-09-20

申请人： Atsushi Yamaguchi ,  Naoyuki Takagi

发明人： Atsushi Yamaguchi ,  Naoyuki Takagi

IPC分类号： G11B1100

CPC分类号： G11B11/10528 ,  G11B11/10513 ,  G11B11/10515 ,  G11B20/1426

摘要： A magneto-optical recording medium includes a recording layer and a reproducing layer respectively formed by magnetic layers on a substrate. A record magnetic domain is formed within the recording layer by using a magnetic head, which is transferred into a reproducing layer by irradiating a laser beam upon reproduction. The physical length in recording a unit bit is taken as a unit domain length. Where the unit domain length is 1T and “1” is recorded in 1T, “1” is recorded in a former half 1T/2 and “0” is in a latter half 1T/2 by applying one period of an alternating magnetic field to the unit domain length.

摘要翻译： 磁光记录介质包括分别由衬底上的磁性层形成的记录层和再现层。 通过使用磁头在记录层内形成记录磁畴，磁头通过在再现时照射激光而被转印到再现层中。 记录单位位的物理长度作为单位域长度。 在单位域长度为1T且在1T中记录为“1”的情况下，在前半部1T / 2中记录“1”，在后半部1T / 2中记录“0”，通过将一个交变磁场周期 单位域长度。