公开(公告)号：EP0288069A3

公开(公告)日：1989-03-29

申请号：EP88106429.9

申请日：1988-04-21

申请人： SONY CORPORATION

发明人： Aratani, Katsuhisa ,  Nakaoki, Ariyoshi ,  Tanaka, Tomiji

IPC分类号： G11B11/00 ,  G11B13/04

CPC分类号： G11B11/10519 ,  G11B11/10506 ,  G11B11/10591 ,  Y10S428/928 ,  Y10T428/12632 ,  Y10T428/12951

摘要： A thermomagnetic recording method is disclosed using a thermomagnetic recording medium where first, second and third magnetic thin films (1-3) each formed of rare-earth and transition metals are sequentially superposed to form layers in a magnetically coupled manner. The recording is carried out by heating the thermomagnetic recording medium under a predetermined magnetic field perpendicular to the film plane thereof while selectively modulating, in accordance with data to be recorded, a first heating state at a first temperature T1 substantially above the Curie point Tc1 of the first magnetic thin film (1) and adequate to hold the sublattice magnetization of the transition metal of the second magnetic thin film in a predetermined direction, and a second heating state at a second temperature T2 substantially above the Curie point Tc1 and adequate to invert the sublattice magnetization of the transition metal of the second magnetic thin film (2) to the reverse of the predetermined direction. In a cooling step subsequent to the first and second heating states, maintaining the sublattice magnetization of the third magnetic thin film in a predetermined direction while orienting the sublattice magnetization of said second magnetic thin film to be directionally coincident with that of the third magnetic thin film at a temperature below the first temperature T1 without directionally inverting the sublattice magnetization of the first magnetic thin film (1).

公开(公告)号：EP1168319A1

公开(公告)日：2002-01-02

申请号：EP01118988.3

申请日：1996-04-10

申请人： SONY CORPORATION

发明人： Kaneko, Masahiko ,  Umezu, Nobuhiko ,  Aratani, Katsuhisa ,  Nakaoki, Ariyoshi

IPC分类号： G11B7/24

CPC分类号： G11B7/242 ,  G11B7/005 ,  G11B7/08511 ,  G11B7/127 ,  G11B7/24 ,  G11B7/24038 ,  G11B7/244 ,  G11B7/2531 ,  G11B7/2534 ,  G11B7/2542 ,  G11B7/257 ,  G11B7/2578 ,  G11B7/258 ,  G11B7/2585 ,  G11B2007/2571 ,  G11B2007/25713 ,  Y10S428/913 ,  Y10S430/146 ,  Y10T428/21 ,  Y10T428/31678

摘要： 1. An optical disc comprises a first information storing layer (13, 23, 43, 62) for reflecting a first laser beam and for transmitting a second laser beam, the wavelength of said second laser beam being shorter than the wavelength of said first laser beam, the information stored in said first information storing layer (13, 23, 43, 62) being read-out by said first laser beam, a second information storing layer (12, 22, 42, 63) for reflecting said second laser beam transmitted through said first information storing layer (13, 23, 43, 62), the information stored in said second information storing layer (12, 22, 42, 63) being read-out by said second laser beam, and a light incidence surface into which first and second laser beams are irradiated for reading-out the information from said first and second information storing layers (13, 23, 43, 62; 12, 22, 42, 63) respectively, said light incidence surface being formed at one side of said optical disc. The first information storing layer (13, 23, 43, 62) and the second information storing layer (12, 22, 42, 63) are provided to be optically separated for separating the reflected laser beam reflected by said first information storing layer (13, 23, 43, 62) and the reflected laser beam reflected by said second information storing layer (12, 22, 42, 63), and the length between said light incidence surface to said second information storing layer is substantially equal to the thickness of said optical disc.

摘要翻译： 1，一种光盘，包括用于反射第一激光束和传输第二激光束的第一信息存储层（13,23,43,62），所述第二激光束的波长比所述第一激光器的波长短 由所述第一激光束读出存储在所述第一信息存储层（13,23,43,62）中的信息;第二信息存储层（12,22,42,63），用于将所述第二激光束 ，通过所述第一信息存储层（13,23,43,62）传输的信息，由所述第二激光束读出存储在所述第二信息存储层（12,22,42,63）中的信息，以及光入射表面 为了从所述第一和第二信息存储层（13,23,43,62; 12,22,42,63）分别读出信息而照射第一和第二激光束，所述光入射表面形成为一个 所述光盘的一侧。 第一信息存储层（13,23,43,62）和第二信息存储层（12,22,42,63）被设置为光学分离以分离由所述第一信息存储层（13）反射的反射激光束 ，23,43,62）和由所述第二信息存储层（12,22,42,63）反射的反射激光束之间的距离以及所述光入射表面到所述第二信息存储层之间的长度基本上等于 所述光盘。

公开(公告)号：EP0513668A1

公开(公告)日：1992-11-19

申请号：EP92107730.1

申请日：1992-05-07

申请人： SONY CORPORATION

发明人： Tanaka, Shintaro ,  Shimouma, Takahashi ,  Nakaoki, Ariyoshi ,  Kaneko, Masahiko

IPC分类号： G11B11/10

CPC分类号： G11B11/10506 ,  G11B11/10521 ,  G11B11/10584 ,  G11B11/10593 ,  Y10S428/90 ,  Y10T428/26 ,  Y10T428/265

摘要： A magneto-optical recording medium comprising a light-transmitting substrate (1) on which a dielectric layer( 2), a memory layer (3) having perpendicular magnetic anisotropy, an intermediate layer (4) having in-plane magnetic anisotropy or slight perpendicular magnetic anisotropy, a recording layer (5) having perpendicular magnetic anisotropy, a dielectric layer (6), a metal layer (7), and a protective layer (8) are formed in a stacked form, the recording medium adapted to be magnetized for recording by a process comprising the step of modulating a first thermal condition and a second thermal condition according to a recording signal, wherein a stacked film (9) composed of the memory layer (3), the intermediate layer (4) and the recording layer (5) has a total thickness of from 100 to 150 nm, the dielectric layer (6) has a thickness of from 50 to 150 nm, and the metal layer (7) has a thickness of from 25 to 150 nm. The magneto-optical recording medium permits a recording laser light to be used with an increased power margin, without causing any increase in the laser power level. Where the thickness of the memory layer is set in the range from 20 to 70 nm, an enhanced reproduction signal output is obtained.

摘要翻译： 一种磁光记录介质，包括透光性基板（1），介质层（2），具有垂直磁各向异性的存储层（3），具有面内磁各向异性或轻微垂直的中间层（4） 磁性各向异性，具有垂直磁各向异性的记录层（5），电介质层（6），金属层（7）和保护层（8）形成为堆叠形式，所述记录介质适于磁化 通过包括根据记录信号调制第一热条件和第二热条件的步骤的方法进行记录，其中由存储层（3），中间层（4）和记录层 （5）的总厚度为100〜150nm，电介质层（6）的厚度为50〜150nm，金属层（7）的厚度为25〜150nm。 磁光记录介质允许以增加的功率余量使用记录激光，而不会引起激光功率电平的任何增加。 在存储层的厚度设定在20〜70nm的范围内的情况下，获得增强的再现信号输出。

公开(公告)号：EP0288069A2

公开(公告)日：1988-10-26

申请号：EP88106429.9

申请日：1988-04-21

申请人： SONY CORPORATION

发明人： Aratani, Katsuhisa ,  Nakaoki, Ariyoshi ,  Tanaka, Tomiji

IPC分类号： G11B11/00 ,  G11B13/04

CPC分类号： G11B11/10519 ,  G11B11/10506 ,  G11B11/10591 ,  Y10S428/928 ,  Y10T428/12632 ,  Y10T428/12951

摘要： A thermomagnetic recording method is disclosed using a thermomagnetic recording medium where first, second and third magnetic thin films (1-3) each formed of rare-earth and transition metals are sequentially superposed to form layers in a magnetically coupled manner. The recording is carried out by heating the thermomagnetic recording medium under a predetermined magnetic field perpendicular to the film plane thereof while selectively modulating, in accordance with data to be recorded, a first heating state at a first temperature T1 substantially above the Curie point Tc1 of the first magnetic thin film (1) and adequate to hold the sublattice magnetization of the transition metal of the second magnetic thin film in a predetermined direction, and a second heating state at a second temperature T2 substantially above the Curie point Tc1 and adequate to invert the sublattice magnetization of the transition metal of the second magnetic thin film (2) to the reverse of the predetermined direction. In a cooling step subsequent to the first and second heating states, maintaining the sublattice magnetization of the third magnetic thin film in a predetermined direction while orienting the sublattice magnetization of said second magnetic thin film to be directionally coincident with that of the third magnetic thin film at a temperature below the first temperature T1 without directionally inverting the sublattice magnetization of the first magnetic thin film (1).

摘要翻译： 一种热磁记录方法是使用光盘，其中第一，第二和第三磁性薄膜（1-3）的稀土和过渡金属的各自形成依次叠置以形成磁耦合的方式层的热磁记录介质游离缺失。 记录是通过其而选择性调节，在雅舞蹈与要记录的数据的预定磁场下垂直于膜平面加热热塑性磁记录介质中进行，在第一温度T1基本上高于居里点的Tc1的第一加热状态 第一磁性薄膜（1）和足以保持所述第二磁性薄膜的过渡金属的亚晶格磁化在一个预定方向上，以及在第二温度T2基本上高于居里点Tc1和足够反转的第二加热状态 第二磁性薄膜（2）于所述预定方向的反向中的过渡金属的亚晶格磁化强度。 在冷却步骤之后将第一和第二加热状态，维持第三磁性薄膜的亚晶格磁化在一个预定方向而定向所述的亚晶格磁化第二磁性薄膜是定向重合所做的第三磁性薄膜的 在第一温度T1以下的温度不定向地反转第一磁性薄膜（1）的亚晶格磁化。

公开(公告)号：EP0492359B1

公开(公告)日：1997-03-19

申请号：EP91121584.6

申请日：1991-12-17

申请人： SONY CORPORATION

发明人： Tanaka, Shintaro ,  Shimouma, Takahashi ,  Aratani, Katsuhisa ,  Nakaoki, Ariyoshi

IPC分类号： G11B11/10 ,  G11B13/04

CPC分类号： G11B11/10584 ,  G11B11/10586

公开(公告)号：EP0491337B1

公开(公告)日：1996-11-20

申请号：EP91121557.2

申请日：1991-12-16

申请人： SONY CORPORATION

发明人： Shimoma, Takashi ,  Suzuki, Kayoko ,  Nakaoki, Ariyoshi ,  Muto, Yoshihiro

IPC分类号： G11B11/10 ,  G11B13/04 ,  G11B11/12

CPC分类号： G11B11/10586 ,  G11B11/10584

公开(公告)号：EP0737966A1

公开(公告)日：1996-10-16

申请号：EP96105641.3

申请日：1996-04-10

申请人： SONY CORPORATION

发明人： Kaneko, Masahiko ,  Umezu, Nobuhiko ,  Aratani, Katsuhisa ,  Nakaoki, Ariyoshi

IPC分类号： G11B7/24

CPC分类号： G11B7/242 ,  G11B7/005 ,  G11B7/08511 ,  G11B7/127 ,  G11B7/24 ,  G11B7/24038 ,  G11B7/244 ,  G11B7/2531 ,  G11B7/2534 ,  G11B7/2542 ,  G11B7/257 ,  G11B7/2578 ,  G11B7/258 ,  G11B7/2585 ,  G11B2007/2571 ,  G11B2007/25713 ,  Y10S428/913 ,  Y10S430/146 ,  Y10T428/21 ,  Y10T428/31678

摘要： A multilayer optical disk having an information storage layer which can as well as be reproduced by a general-purpose reproducing apparatus, for example, a compact disk player, and from which information can be read from other information storage layers by using an exclusive reproducing apparatus. The multilayer optical disk having a plurality of information storage layers according to the present invention includes a plurality of information storage layers, wherein one of the plural information storage layers has a reflection factor of 70 % or higher with respect to a wavelength of 770 nm to 830 nm which is a first wavelength of reproducing light, and other information storage layers are reproduced with reproducing light having a second wavelength which is different from the first wavelength of reproducing light. Each of the other information storage layers has a reflection factor of 20 % or higher with respect to the second wavelength of reproducing light. The second wavelength of reproducing light is 615 nm to 655 nm.

摘要翻译： 具有信息存储层的多层光盘，其可以由通用再现装置（例如，光盘播放器）再现，并且可以通过使用专用再现装置从其它信息存储层读取信息 。 根据本发明的具有多个信息存储层的多层光盘包括多个信息存储层，其中多个信息存储层中的一个信息存储层的反射率相对于770nm的波长具有70％以上的反射率， 作为再现光的第一波长的830nm，以及与再现光的第一波长不同的具有第二波长的再现光再现其它信息存储层。 每个其它信息存储层相对于再现光的第二波长具有20％或更高的反射系数。 再生光的第二波长为615nm〜655nm。

公开(公告)号：EP0525705A3

公开(公告)日：1993-09-08

申请号：EP92112810.4

申请日：1992-07-27

申请人： SONY CORPORATION

发明人： Suzuki, Kayoko ,  Nakaoki, Ariyoshi ,  Muto, Yoshihiro

IPC分类号： G11B11/10

CPC分类号： G11B11/10532 ,  G11B11/10523 ,  G11B11/10586

摘要： 57 A magneto-optical recording apparatus records information on a magneto-optical recording medium (20) composed of a memory layer (1) and a recording layer (2) which are disposed on a substrate (11), each comprising a magnetic thin film of amorphous-rare-earth transition-metal alloy. The memory and recording layers (1,2) are magnetically coupled directly, or through an intermediate layer (3) therebetween, to each other under an exchange force. A recording magnetic field generator such as a permanent magnet or an electromagnet applies a recording magnetic field to the magneto-optical recording medium (20), and an initializing magnetic field generator such as a permanent magnet or an electromagnet applies an initializing magnetic force to the magneto- optical recording medium. The initializing magnetic field generator has a magnetic pole confronting a surface of the magneto-optical recording medium. The initializing magnetic force comprises a magnetic field H v directed perpendicularly to the surface of the magneto-optical recording medium, and a magnetic field H H directed along the surface of the magneto- optical recording medium. The magnetic fields H v , H H are defined as follows: and where H c2 is the coercive force of the recording layer and H w2 is the exchange force.

公开(公告)号：EP0288069B1

公开(公告)日：1992-10-07

申请号：EP88106429.9

申请日：1988-04-21

申请人： SONY CORPORATION

发明人： Aratani, Katsuhisa ,  Nakaoki, Ariyoshi ,  Tanaka, Tomiji

IPC分类号： G11B11/00 ,  G11B13/04

CPC分类号： G11B11/10519 ,  G11B11/10506 ,  G11B11/10591 ,  Y10S428/928 ,  Y10T428/12632 ,  Y10T428/12951

公开(公告)号：EP1724769A3

公开(公告)日：2009-04-15

申请号：EP06009682.3

申请日：2006-05-10

申请人： Sony Corporation

发明人： Saito, Kimihiro ,  Yamasaki, Takeshi ,  Nakaoki, Ariyoshi

IPC分类号： G11B7/135 ,  G11B7/254

CPC分类号： G11B7/139 ,  B82Y10/00 ,  G11B7/1387 ,  G11B7/24 ,  G11B7/24059 ,  G11B7/243

摘要： An optical recording medium illuminated by light from a light source as near-field light using a focusing lens whose numerical aperture exceeds 1 to perform recording and/or reproduction is provided, wherein a composite layer in which a high refractive index material portion having a refractive index higher than that of a light-transmissible material portion is mixed in the light-transmissible material portion is provided on the surface of a light incident side of the optical recording medium. With an average refractive index of the composite layer being high, a numerical aperture controlled by a refractive index of a surface layer can be made large to obtain higher resolution and higher durability against contact with a lens or the like.