公开(公告)号：US5863649A

公开(公告)日：1999-01-26

申请号：US928894

申请日：1997-09-12

申请人： Junji Hirokane ,  Hiroyuki Katayama ,  Akira Takahashi ,  Kenji Ohta

发明人： Junji Hirokane ,  Hiroyuki Katayama ,  Akira Takahashi ,  Kenji Ohta

IPC分类号： G11B11/10 ,  C09D5/23 ,  G11B11/105 ,  G11B5/66 ,  B32B15/01 ,  G11B11/00

CPC分类号： G11B11/10504 ,  G11B11/10515 ,  G11B11/10586 ,  G11B11/10595 ,  G11B11/10589 ,  Y10T428/26

摘要： In a magneto-optical recording medium including a reading-out layer, which is in an in-plane magnetization state at a room temperature and in a perpendicular magnetization state when the temperature rises, and a recording layer, which is in a perpendicular magnetization state at a room temperature to a Curie point, an intermediate layer having in-plane magnetization component and a lower Curie point than the recording medium is formed between the reading-out layer and the recording layer so as to abruptly change magnetization state of the reading-out layer. Since magnetization state of the reading-out layer is abruptly changed, recording is carried out highdensely. Moreover, since exchange-coupling between the reading-out layer and the recording layer is controlled, a recording characteristic is improved.

摘要翻译： 在包括读出层的磁光记录介质中，当温度升高时，其在室温下处于平面内的磁化状态，并且在垂直磁化状态下处于垂直磁化状态的记录层 在室温至居里点时，在读出层和记录层之间形成具有面内磁化分量和比记录介质低的居里点的中间层，从而突然改变读出层的磁化状态， 外层。 由于读出层的磁化状态突然变化，所以高度地进行记录。 此外，由于读出层和记录层之间的交换耦合被控制，所以提高了记录特性。

公开(公告)号：US5862110A

公开(公告)日：1999-01-19

申请号：US744558

申请日：1996-11-06

申请人： Kunio Yamamiya

发明人： Kunio Yamamiya

IPC分类号： G11B7/085 ,  G11B5/09 ,  G11B7/00 ,  G11B7/09 ,  G11B7/095 ,  G11B11/10 ,  G11B11/105 ,  G11B17/02 ,  G11B17/04 ,  G11B19/02 ,  G11B19/04 ,  G11B19/10 ,  G11B19/20 ,  G11B33/02

CPC分类号： G11B7/0945 ,  G11B11/10558 ,  G11B11/10571 ,  G11B11/10576 ,  G11B11/10595 ,  G11B17/0288 ,  G11B19/06 ,  G11B19/2009 ,  G11B19/2054 ,  G11B7/0857 ,  G11B7/0908 ,  G11B7/08511 ,  G11B7/08582

摘要： An apparatus for recording and/or reproducing information on and/or from a magneto-optical disk including an optical head for projecting a laser beam onto a magneto-optical disk and receiving the laser beam reflected by the disk, an up-down block arranged movably between a lower position and an upper position, an up-down motor for moving said up-down block up and down, a turntable for supporting the disk and a spindle motor secured to said up-down block and having a driving shaft coupled with said turntable for rotating the turntable, a position detecting device for detecting a position of said up-down block to derive a position signal when the up-down block is driven into the upper position, a rotation detecting device for detecting a rotation of said optical information record disk to derive a rotation signal when the optical information record disk is rotated at a predetermined revolving speed, and a control device for initiating a focus control for moving said objective lens and turntable relative to each other in accordance with said position signal and rotation signal.

公开(公告)号：US5859813A

公开(公告)日：1999-01-12

申请号：US963986

申请日：1997-11-04

申请人： Akihiro Itakura ,  Haruhiko Izumi

发明人： Akihiro Itakura ,  Haruhiko Izumi

IPC分类号： G11B11/10 ,  G11B7/00 ,  G11B7/0045 ,  G11B11/105

CPC分类号： G11B11/1053 ,  G11B11/10506

摘要： The invention provides magneto-optical recording method and apparatus, in which a space area on a magneto-optical recording medium is irradiated with a beam in the form of a pulse train in which a bottom power and an assist power are alternately repeated, so as to rapidly change the temperature at the front edge of a recording mark, thereby preventing jitter from increasing.

摘要翻译： 本发明提供了一种磁光记录方法和装置，其中磁光记录介质上的空间区域被以下列功率和辅助功率交替重复的脉冲串形式的光束照射，以便 以快速地改变记录标记的前边缘处的温度，从而防止抖动增加。

公开(公告)号：US5856957A

公开(公告)日：1999-01-05

申请号：US939091

申请日：1997-09-26

申请人： Toshihisa Tanaka

发明人： Toshihisa Tanaka

IPC分类号： G11B11/10 ,  G11B5/02 ,  G11B11/105

CPC分类号： G11B11/10534 ,  G11B11/1056

摘要： A compact magnetic field applying device rotates and holds a magnetic field generating member using a small-scale, light-weight vibration actuator. A permanent magnet applies a bias magnetic field on a magnetized information recording area of a magnetooptical disk, and is driven by a vibration actuator. When voltage is applied to a piezoelectric element of the vibration actuator, an annular elastic member generates a travelling wave due to a bending vibration in the perimeter direction of a groove on the elastic member. Because the elastic member and a moving member provided on the permanent magnet are pressed into contact by a coil spring, the permanent magnet rotates. When voltage is not applied to the piezoelectric element, because the elastic member and the moving member are pressed into contact, the permanent magnet is held in a specified rotational position.

摘要翻译： 小型磁场施加装置使用小型轻型振动促动器旋转并保持磁场产生部件。 永磁体在磁光盘的磁化信息记录区域上施加偏置磁场，并由振动致动器驱动。 当电压施加到振动致动器的压电元件时，环形弹性构件由于弹性构件上的凹槽的周向的弯曲振动而产生行波。 由于弹性构件和设置在永久磁铁上的移动构件被螺旋弹簧压接，所以永磁体旋转。 当不向压电元件施加电压时，由于弹性构件和移动构件被按压接触，永磁体被保持在指定的旋转位置。

公开(公告)号：US5852596A

公开(公告)日：1998-12-22

申请号：US662668

申请日：1996-06-14

申请人： Shinichi Kurita ,  Hiroyuki Matsumoto ,  Masashi Horikawa ,  Koichiro Ishii

发明人： Shinichi Kurita ,  Hiroyuki Matsumoto ,  Masashi Horikawa ,  Koichiro Ishii

IPC分类号： G11B11/10 ,  G11B7/00 ,  G11B7/004 ,  G11B7/0045 ,  G11B7/005 ,  G11B7/125 ,  G11B11/105 ,  G11B20/10

CPC分类号： G11B7/126 ,  G11B11/10595 ,  G11B20/10009 ,  G11B7/0045 ,  G11B7/005

摘要： The current invention is directed to an optical storage medium system and a method for adjusting an electrically converted optical signal representing the stored data based upon the environmental or optical disk temperature and/or a heat characteristics of the optical disk.

摘要翻译： 本发明涉及一种光存储介质系统和一种用于基于环境或光盘温度和/或光盘的热特性来调整表示存储数据的电转换光信号的方法。

公开(公告)号：US5850380A

公开(公告)日：1998-12-15

申请号：US890829

申请日：1997-07-10

申请人： Wataru Kubo

发明人： Wataru Kubo

IPC分类号： G11B11/10 ,  G11B7/09 ,  G11B7/13 ,  G11B7/135 ,  G11B11/105

CPC分类号： G11B7/133 ,  G11B11/10543 ,  G11B7/1353 ,  G11B7/1356 ,  G11B7/1381 ,  G11B7/0912

摘要： A photomagnetic head apparatus includes a beam splitter which splits a laser beam, reflected by concentric recording tracks of a rotating photomagnetic recording disc, into three bundles of rays. The three bundles of rays have different polarization directions in a plane which lies in a radial direction of the recording tracks. One of the three bundles of rays is used as a servo-signal light, and the remaining two bundles of rays are used as data signal lights. A defocusing diffraction element splits at least the servo-signal light into a least two bundles of rays in a direction corresponding to the tangential direction of the recording tracks, substantially perpendicular to the split direction of the beam splitter and which provides at least two split lights with a predetermined amount of positive or negative defocus in an optical axis direction. A pair of servo-signal light receiving elements receive the split beams of the servo-signal light produced by the defocusing diffraction element. A data light receiving element receives the data signal lights. The defocusing diffraction element is made of a non-circular element whose numerical aperture in the tangential direction of the recording tracks is smaller than the numerical aperture in the radial direction.

摘要翻译： 光磁头装置包括分束器，其将由旋转的光磁记录盘的同心记录轨道反射的激光束分成三束光束。 三束光线在位于记录道的径向方向的平面内具有不同的偏振方向。 三束光线之一用作伺服信号灯，其余两束光线用作数据信号灯。 散焦衍射元件至少将伺服信号光在与记录磁道的切线方向对应的方向上分成至少两束光线，该方向基本上垂直于分束器的分割方向，并且提供至少两个分光 在光轴方向上具有预定量的正或负散焦。 一对伺服信号光接收元件接收由散焦衍射元件产生的伺服信号光的分束。 数据光接收元件接收数据信号灯。 散焦衍射元件由非圆形元件制成，其记录磁道的切线方向上的数值孔径小于径向数值孔径。

公开(公告)号：US5841612A

公开(公告)日：1998-11-24

申请号：US778852

申请日：1997-01-06

申请人： Shinichi Nanjyo

发明人： Shinichi Nanjyo

IPC分类号： G11B5/31 ,  G11B11/10 ,  G11B11/105 ,  G11B5/127

CPC分类号： G11B11/10576 ,  G11B11/1058

摘要： A magnetic head for magneto-optical recording comprises a head body (32) having a sliding portion (37) which causes a head element to come in sliding contact with a magneto-optical disc (1). The sliding portion (37) is disposed on an inner periphery of the magneto-optical disc (1) relative to a central magnetic pole core (14a) of the head element so that, even when the central magnetic pole core 14a is located at an outer peripheral point (A) of the magneto-optical disc (1), the sliding portion (37) can be prevented from hitting a bump portion formed on the outer periphery of the magneto-optical disc (1). Thus, in the sliding type magnetic head for magneto-optical recording, a utilization factor of a reliable recording and reproducing region of the magneto-optical disc (1) can be improved.

公开(公告)号：US5838649A

公开(公告)日：1998-11-17

申请号：US955909

申请日：1997-10-23

申请人： Yoshiro Joichi

发明人： Yoshiro Joichi

IPC分类号： G11B7/0037 ,  G11B7/007 ,  G11B11/10 ,  G11B11/105 ,  G11B20/02 ,  G11B20/06 ,  G11B20/14 ,  G11B20/18 ,  H09H5/76 ,  G11B7/24

CPC分类号： G11B20/1419 ,  G11B20/025 ,  G11B20/06 ,  G11B11/10502 ,  G11B20/1833 ,  G11B7/0037 ,  G11B7/007

摘要： A frequency modulated signal, which is expected to have level inversions at data bit boundaries, and which is produced by the reflection of a laser beam from a wobbled spiral groove on a disk-shaped recording medium is detected. The frequency modulated signal is demodulated and its signal level at the location just after the absence of a level inversion is corrected. The position of a movable recording/reproducing head is determined in response to the demodulated FM signal; and data is recorded on or reproduced from the recording medium at the determined position.

摘要翻译： 检测到预计在数据位边界处具​​有水平反转并且通过来自盘状记录介质上的摆动螺旋槽的激光束的反射产生的频率调制信号。 对频率调制信号进行解调，并且在不存在电平反转之前的位置校正其信号电平。 响应于解调的FM信号确定可移动记录/再现头的位置; 并且在确定的位置处将数据记录在记录介质上或从记录介质再现。

公开(公告)号：US5822282A

公开(公告)日：1998-10-13

申请号：US779774

申请日：1997-01-07

申请人： Junichiro Nakayama ,  Michinobu Mieda ,  Junji Hirokane ,  Akira Takahashi

发明人： Junichiro Nakayama ,  Michinobu Mieda ,  Junji Hirokane ,  Akira Takahashi

IPC分类号： G11B11/10 ,  G11B11/105 ,  G11B11/00

CPC分类号： G11B11/10586 ,  G11B11/10521 ,  G11B11/10506

摘要： A magneto-optical recording medium has at least a substrate, a first magnetic layer, a second magnetic layer, and a first interface layer provided between the first and second magnetic layers. The first magnetic layer exhibits a perpendicular magnetic anisotropy from room temperature to a Curie temperature thereof. The second magnetic layer has a coercive force lower than A: that of the first magnetic layer at room temperature, has a Curie temperature higher than that of the first magnetic layer, and exhibits a perpendicular magnetic anisotropy from room temperature to a Curie temperature of the second magnetic layer. The first interface layer is made of at least one rare-earth metal and has a thickness of several atoms. With this arrangement, it is possible (1) to carry out light modulation overwriting with respect to the magneto-optical recording medium, (2) to carry out initialization without an initializing magnetic field, and (3) to stabilize recording bits.

摘要翻译： 磁光记录介质至少具有衬底，第一磁性层，第二磁性层和设置在第一和第二磁性层之间的第一界面层。 第一磁性层表现出从室温到其居里温度的垂直磁各向异性。 第二磁性层具有低于A的矫顽力：室温下的第一磁性层的矫顽力的居里温度高于第一磁性层的居里温度，并呈现出从室温到居里温度的垂直磁各向异性 第二磁性层。 第一界面层由至少一种稀土金属制成，具有几个原子的厚度。 通过这种布置，可以（1）对磁光记录介质进行光调制重写，（2）在不进行初始化磁场的情况下进行初始化，以及（3）稳定记录位。

公开(公告)号：US5812501A

公开(公告)日：1998-09-22

申请号：US815947

申请日：1997-03-13

申请人： Mineo Moribe ,  Haruhiko Izumi ,  Masakazu Taguchi ,  Iwao Tsugawa

发明人： Mineo Moribe ,  Haruhiko Izumi ,  Masakazu Taguchi ,  Iwao Tsugawa

IPC分类号： G11B11/10 ,  G11B7/00 ,  G11B7/004 ,  G11B7/0055 ,  G11B7/013 ,  G11B7/24 ,  G11B7/26 ,  G11B7/30 ,  G11B11/105 ,  G11B19/02 ,  G11B20/00 ,  G11B23/28 ,  G11B23/36 ,  G11B13/00

CPC分类号： G11B23/281 ,  G11B11/10582 ,  G11B19/02 ,  G11B20/00086 ,  G11B20/00876 ,  G11B23/284 ,  G11B23/36 ,  G11B7/24 ,  G11B7/24085 ,  G11B7/26

摘要： An optical recording medium in which a medium identification code is recorded as a nonvolatile mark which is formed through irreversible change of a recording film, such as magnetization characteristic change, deformation and formation of a hole, so as to prevent illegal copying of the optical recording medium, and a recording/reproducing method for the same.

摘要翻译： 一种光记录介质，其中介质识别码被记录为通过记录膜的不可逆变化形成的非易失性标记，例如磁化特性变化，变形和孔的形成，以防止光学记录的非法复制 介质及其记录/再现方法。