公开(公告)号：US5673248A

公开(公告)日：1997-09-30

申请号：US548469

申请日：1995-10-26

申请人： Hiroshi Hasegawa ,  Hiromichi Kobori

发明人： Hiroshi Hasegawa ,  Hiromichi Kobori

IPC分类号： G11B7/0045 ,  G11B7/0055 ,  G11B7/006 ,  G11B7/007 ,  G11B7/125 ,  G11B7/00

CPC分类号： G11B7/00736 ,  G11B7/006 ,  G11B7/126 ,  G11B7/00454 ,  G11B7/00557

摘要： An optical recording apparatus that rewrites recorded information on a modified constant angular velocity type phase change optical disk by overwriting using at least a recording light beam, erasing light beam and off-pulse light beam irradiation. The apparatus comprises a semiconductor laser for irradiating the optical disk with the light beam and a control unit for controlling the intensities P1, P2 and P3, wherein P1>P2>P3, of the light beam with which the optical disk is irradiated and their irradiation periods .tau.1 and .tau.3 to obtain a relation of {(P2-P3).times..tau.3}/{(P1-P2).times..tau.1}=below 1.

摘要翻译： 一种光学记录装置，其通过使用至少记录光束进行重写，擦除光束和截止脉冲光束照射来重写经修改的恒定角速度型相变光盘的记录信息。 该装置包括用于用光束照射光盘的半导体激光器和用于控制照射光盘的光束的P1> P2> P3的强度P1，P2和P3的控制单元及其照射 周期τ1和τ3以获得{（P2-P3）×tau3} / {（P1-P2）×tau1} = 1以下的关系。

公开(公告)号：US5475210A

公开(公告)日：1995-12-12

申请号：US73320

申请日：1993-06-08

申请人： Toyoki Taguchi ,  Toshihiro Sugaya ,  Hisashi Yamada ,  Kei Shimura ,  Isao Hoshino ,  Masahiko Tanaka ,  Teruo Murakami ,  Hiroharu Satoh ,  Hiromichi Kobori ,  Sadanari Fujimoto

发明人： Toyoki Taguchi ,  Toshihiro Sugaya ,  Hisashi Yamada ,  Kei Shimura ,  Isao Hoshino ,  Masahiko Tanaka ,  Teruo Murakami ,  Hiroharu Satoh ,  Hiromichi Kobori ,  Sadanari Fujimoto

IPC分类号： G11B7/125 ,  H01S5/022 ,  H01S5/0683 ,  H04N5/85 ,  H04N5/911 ,  G01J1/32

CPC分类号： G11B7/126 ,  H04N5/911 ,  H01S5/02248 ,  H01S5/02296 ,  H01S5/0683 ,  H04N5/85

摘要： An optical disk apparatus includes a semiconductor laser for emitting a light beam, and an automatic power control or APC circuit for driving the laser. A compound prism structure is optically coupled to the laser in an optical head section, and defines a first optical path for causing a front laser light to be projected onto a rotating optical disk and guiding a reflected light therefrom toward a first photodetector, and a second optical path for guiding a part of the reflected light toward a second photodetector. An output signal of the first photodetector is used to generate a reproduced information signal. An output signal of the second photodetector is fed back to the APC circuit as a front light monitor signal. A part of a laser control signal internally generated in the APC circuit is supplied through a wiring line to a noise reduction circuit as a laser noise monitor signal. The noise reduction circuit subtracts this noise monitor signal from the reproduced information signal to provide a noise-suppressed information signal.

摘要翻译： 光盘装置包括用于发射光束的半导体激光器和用于驱动激光器的自动功率控制或APC电路。 复合棱镜结构在光学头部分光学耦合到激光器，并且限定第一光路，用于使前激光投射到旋转光盘上并将其反射的光从第一光电检测器引导，第二光路 用于将一部分反射光引导到第二光电检测器的光路。 第一光电检测器的输出信号用于产生再生信息信号。 第二光电检测器的输出信号作为前光监视信号反馈到APC电路。 在APC电路中内部生成的激光控制信号的一部分通过布线作为激光噪声监视信号提供给降噪电路。 噪声降低电路从再生信息信号中减去该噪声监视信号，提供噪声抑制信息信号。

公开(公告)号：US07894317B2

公开(公告)日：2011-02-22

申请号：US12034818

申请日：2008-02-21

申请人： Hiroshi Hasegawa ,  Hiromichi Kobori

发明人： Hiroshi Hasegawa ,  Hiromichi Kobori

IPC分类号： G11B7/00

CPC分类号： G11B7/0903 ,  G11B7/094 ,  G11B2007/0013

摘要： A tracking control is performed based on a first tracking error signal obtained from a first light beam reflected on an optical recording medium and a second tracking error signal obtained from a second light beam reflected on the optical recording medium. The first tracking error signal is corrected when recording information to or reproducing information from a first information recording layer that includes a first area facing an area on a second information recording layer with no information recorded and a second area facing an area on the second information recording layer with information recorded.

摘要翻译： 基于从在光记录介质上反射的第一光束获得的第一跟踪误差信号和从在光记录介质上反射的第二光束获得的第二跟踪误差信号执行跟踪控制。 当从第一信息记录层记录信息或从第一信息记录层再现信息时，第一跟踪误差信号被校正，所述第一信息记录层包括面向第二信息记录层上没有记录信息的区域的第一区域和面向第二信息记录区域的第二区域 层与信息记录。

公开(公告)号：US07016271B2

公开(公告)日：2006-03-21

申请号：US10252611

申请日：2002-09-24

申请人： Hiromichi Kobori

发明人： Hiromichi Kobori

IPC分类号： G11B7/00

CPC分类号： G11B7/0903 ,  G11B7/00718 ,  G11B7/00745 ,  G11B7/0938 ,  G11B7/1353 ,  G11B7/24079

摘要： An optical recording/reproducing apparatus comprises a light beam emitting unit which emits a plurality of light beams to the recording medium, a photodetection unit which detects the reflected light beams and output detection signals, a detection signal selection unit which selects one of the detection signals according to one of a plurality of tracks which is selected in order to record or reproduce data, the tracks being formed on at least one of the land and the groove, and a tracking control unit which make one of the light beams trace the track which is selected in order to record or reproduce data, according to the selected detection signal.

公开(公告)号：US4984226A

公开(公告)日：1991-01-08

申请号：US402760

申请日：1989-09-05

申请人： Hiromichi Kobori

发明人： Hiromichi Kobori

IPC分类号： G11B11/105

CPC分类号： G11B11/10576 ,  G11B11/10517 ,  G11B11/10532 ,  G11B11/10552

摘要： To reduce the size and thickness of a magnetooptic head, a single hollow cylindrical permanent magnet magnetized in the radial direction thereof is arranged at the center of a condenser lens. The axial component of the magnetic flux is available for an external magnetic field required for recording and erasing operations, while the radial component of the magnetic flux is available for a magnetic field required for focusing operation in cooperation with a cylindrical focusing coil arranged coaxially with the cylindrical magnet.

公开(公告)号：US4868802A

公开(公告)日：1989-09-19

申请号：US77851

申请日：1987-07-27

申请人： Hiromichi Kobori

发明人： Hiromichi Kobori

IPC分类号： G11B11/105

CPC分类号： G11B11/10576 ,  G11B11/10517 ,  G11B11/10532 ,  G11B11/10552

摘要： To minimize the size and thickness of a magnetooptic head, a plurality of permanent magnets are arranged symmetrical with respect to the center of a condenser lens in such a way that the magnetic flux extends in both axial and radial directions of the condenser lens or that the same magnet poles are confronted each other. The axial magnetic flux is available for external magnetic field required for recording and erasing operations; while the radial magnetic flux is available for a magnetic field required for focusing and tracking operation is cooperation with focusing and tracking coils. In addition, part of the radial magnetic flux is available for lens position detection in cooperation with Hall elements to generate a lens position signal.

摘要翻译： 为了最小化磁光头的尺寸和厚度，多个永磁体相对于聚光透镜的中心对称地布置成使得磁通量在聚光透镜的轴向和径向方向上延伸，或者 相同的磁极相互面对。 轴向磁通可用于记录和擦除操作所需的外部磁场; 而径向磁通可用于聚焦和跟踪操作所需的磁场，与聚焦和跟踪线圈配合。 另外，一部分径向磁通可用于与霍尔元件协作进行透镜位置检测，以产生透镜位置信号。

公开(公告)号：US5673249A

公开(公告)日：1997-09-30

申请号：US617630

申请日：1996-03-19

申请人： Hiroshi Hasegawa ,  Hiromichi Kobori

发明人： Hiroshi Hasegawa ,  Hiromichi Kobori

IPC分类号： G11B7/0045 ,  G11B7/0055 ,  G11B7/006 ,  G11B7/007 ,  G11B7/125 ,  G11B7/00

CPC分类号： G11B7/00736 ,  G11B7/006 ,  G11B7/126 ,  G11B7/00454 ,  G11B7/00557 ,  G11B7/0079

摘要： An optical recording apparatus which records information by irradiating an optical recording medium with a light beam of a first intensity P1 for an irradiation period .tau.1 so as to form an amorphous state area in the recording medium, with a light beam of a third intensity P3 during an irradiation period .tau.3 and with a light beam of a second intensity P2 so as to form a crystal state area in the recording medium optical recording medium includes an information recording area provided for recording the recording information and a recording condition recording area provided for recording a recording condition. The recording condition recording area is provided on one of an outer circumference side and inner circumference side of the information recording area. The recording condition recording area stores recording condition data representing the intensities P1, P2, P3 (P1>P2>P3) and irradiation periods .tau.1, .tau.3 of the light beam corresponding to the radius position of the optical recording medium and satisfying the condition {(P2-P3).times..tau.3}/{(P1-P2).times..tau.1}=below unity.

摘要翻译： 一种光学记录装置，其通过用照射周期τ1的第一强度P1的光束照射光学记录介质来记录信息，以便在记录介质中形成具有第三强度P3的光束 在照射时间段τ3期间和具有第二强度P2的光束以便在记录介质中形成晶体状态区域光学记录介质包括用于记录记录信息的信息记录区和提供用于记录信息的记录条件记录区 录制条件。 记录条件记录区域设置在信息记录区域的外周侧和内周侧之一上。 记录条件记录区域存储表示对应于光记录介质的半径位置的光束的强度P1，P2，P3（P1> P2> P3）和照射周期τ1，τ3的记录条件数据，并且满足条件 {（P2-P3）×tau 3} / {（P1-P2）×tau1} =低于统一。

公开(公告)号：US07518961B2

公开(公告)日：2009-04-14

申请号：US11370408

申请日：2006-03-08

申请人： Hiroshi Hasegawa ,  Hiromichi Kobori

发明人： Hiroshi Hasegawa ,  Hiromichi Kobori

IPC分类号： G11B7/00

CPC分类号： G11B7/08511 ,  G11B7/0956 ,  G11B2007/0013

摘要： An optical disk recording and reproducing apparatus includes a focus unit that focuses an irradiation light beam on an optical disk having data recording layers and tracks; a drive unit that changes a direction of the beam by moving the focus unit; a tilt control unit that detects a tilt amount of the optical disk, computes a control operation amount in a band wider than a rotation frequency of the optical disk based on the tilt amount, and controls the drive unit to move the focus unit based on the control operation amount. The tilt control unit holds a control state of the control at an immediate pre-state of an inter-layer jump in which the beam is moved to a different data recording layer or a track jump in which the beam is moved to a different track during the inter-layer jump or the track jump.

摘要翻译： 光盘记录和再现装置包括：聚焦单元，其将照射光束聚焦在具有数据记录层和轨道的光盘上; 通过移动所述聚焦单元来改变所述光束的方向的驱动单元; 倾斜控制单元，其检测光盘的倾斜量，基于倾斜量计算比光盘的旋转频率宽的带的控制操作量，并且控制驱动单元基于所述倾斜量移动聚焦单元 控制操作量。 倾斜控制单元将控制的控制状态保持在其中波束被移动到不同的数据记录层或轨道跳跃的层间跳跃的即时状态，其中波束被移动到不同的轨道 层间跳跃或轨道跳跃。

公开(公告)号：US20080239903A1

公开(公告)日：2008-10-02

申请号：US12034818

申请日：2008-02-21

申请人： Hiroshi Hasegawa ,  Hiromichi Kobori

发明人： Hiroshi Hasegawa ,  Hiromichi Kobori

IPC分类号： G11B5/58

CPC分类号： G11B7/0903 ,  G11B7/094 ,  G11B2007/0013

摘要： A tracking control is performed based on a first tracking error signal obtained from a first light beam reflected on an optical recording medium and a second tracking error signal obtained from a second light beam reflected on the optical recording medium. The first tracking error signal is corrected when recording information to or reproducing information from a first information recording layer that includes a first area facing an area on a second information recording layer with no information recorded and a second area facing an area on the second information recording layer with information recorded.

摘要翻译： 基于从在光记录介质上反射的第一光束获得的第一跟踪误差信号和从在光记录介质上反射的第二光束获得的第二跟踪误差信号执行跟踪控制。 当从第一信息记录层记录信息或从第一信息记录层再现信息时，第一跟踪误差信号被校正，所述第一信息记录层包括面向第二信息记录层上没有记录信息的区域的第一区域和面向第二信息记录区域的第二区域 层与信息记录。

公开(公告)号：US5187694A

公开(公告)日：1993-02-16

申请号：US885014

申请日：1992-05-19

申请人： Katsutarou Ichihara ,  Hiromichi Kobori

发明人： Katsutarou Ichihara ,  Hiromichi Kobori

IPC分类号： G11B11/105

CPC分类号： G11B11/10517 ,  G11B11/10504 ,  G11B11/10586

摘要： A magneto-optical information storage medium includes a substrate, a recording layer formed on the substrate and having an axis of easy magnetization extending in the direction perpendicular to its surface, a nonmagnetic layer formed on the recording layer, and a bias layer, formed on the nonmagnetic layer, for generating bias magnetic field H.sub.B (T) in accordance with a temperature. The magnetization of the recording layer is reversed by bias magnetic field H.sub.B (T) in first and second magnetization reversal temperature regions T.sub.W and T.sub.E (T.sub.W >T.sub.E). Information is recorded on such a magneto-optical information storage medium by radiating a first laser beam having a first power level for heating an irradiated portion to a temperature in region T.sub.W. In addition, information erasing is performed by radiating a second laser beam having a second power level which is lower than the first power level and heats an irradiated portion to a temperature in region T.sub.E. Overwrite is performed by power-modulating between the first and second power levels and radiating the modulated laser beam onto a previously recorded area of the medium.

摘要翻译： 磁光信息存储介质包括基板，形成在基板上的记录层，其具有在垂直于其表面的方向上易于磁化的轴线，形成在记录层上的非磁性层，以及偏置层，形成在 非磁性层，用于根据温度产生偏置磁场HB（T）。 在第一和第二磁化反转温度区域TW和TE（TW> TE）中，记录层的磁化被偏置磁场HB（T）反转。 通过将具有第一功率电平的第一激光束照射到区域TW中的温度，将信息记录在这种磁光信息存储介质上。 此外，通过照射具有低于第一功率电平的第二功率电平的第二激光束并将照射部分加热到区域TE中的温度来执行信息擦除。 通过在第一和第二功率电平之间的功率调制执行覆盖，并将调制的激光束辐射到介质的先前记录的区域上。