公开(公告)号：US06728183B1

公开(公告)日：2004-04-27

申请号：US09512558

申请日：2000-02-24

申请人： Hitoshi Takeuchi ,  Junsaku Nakajima

发明人： Hitoshi Takeuchi ,  Junsaku Nakajima

IPC分类号： G11B7125

CPC分类号： G11B7/126 ,  G11B7/00454

摘要： An optical device to control the output power of a laser on recording and reproduction without expensive high-speed circuits is provided. The optical disk device of the present invention comprises monitor portion for monitoring the power of laser light, averaged light quantity calculating portion for calculating the averaged light quantity of the power of the laser light, memory portion for memorizing the averaged light quantity, error quantity calculated portion for calculating the difference between the output signals of the averaged light quantity calculating portion and the memory portion, and laser power control portion for controlling the power of the laser light in response to the output signal from the error quantity calculating portion.

摘要翻译： 提供了一种用于在没有昂贵的高速电路的情况下在记录和再现时控制激光器的输出功率的光学装置。 本发明的光盘装置包括用于监视激光功率的监视部分，用于计算激光功率的平均光量的平均光量计算部分，用于存储平均光量的存储部分，计算出的误差量 用于计算平均光量计算部分和存储器部分的输出信号之间的差的部分，以及用于响应于来自误差量计算部分的输出信号来控制激光功率的激光功率控制部分。

公开(公告)号：US06556517B1

公开(公告)日：2003-04-29

申请号：US09419232

申请日：1999-10-15

申请人： Junsaku Nakajima

发明人： Junsaku Nakajima

IPC分类号： G11B1100

CPC分类号： B82Y25/00 ,  B82Y10/00 ,  G11B5/00 ,  G11B5/17 ,  G11B7/122 ,  G11B7/1372 ,  G11B7/22 ,  G11B11/10536 ,  G11B11/10543 ,  G11B11/10554 ,  G11B11/1058 ,  G11B2005/0002 ,  G11B2005/0021 ,  G11B2005/3996

摘要： A magneto-optical head device includes a light source, an objective lens which condenses a light beam emitted from the light source, an auxiliary lens which converts an effective numerical aperture of the light beam condensed by the objective lens to irradiate a recording medium with the light beam, and a magnetic reproducing head which is integrated into the auxiliary lens. The magneto-optical head device can thus be decreased in size and information can be reproduced from both surfaces of a disk since the magnetic reproducing head is integrated into the auxiliary lens. Further, when a thermomagnetic recording medium is employed as the recording medium, the magneto-optical head device can reproduce information recorded at a high track density and a high line density.

摘要翻译： 磁光头装置包括光源，会聚从光源发射的光束的物镜，辅助透镜，其转换由物镜会聚的光束的有效数值孔径以照射记录介质 光束和集成到辅助透镜中的磁性再现头。 因此，磁光头装置的尺寸可以减小，并且可以从盘的两个表面再现信息，因为磁性再现头被集成到辅助透镜中。 此外，当使用热磁记录介质作为记录介质时，磁光头装置可以再现以高轨道密度和高线密度记录的信息。

公开(公告)号：US07072251B2

公开(公告)日：2006-07-04

申请号：US10671239

申请日：2003-09-24

申请人： Junsaku Nakajima ,  Hitoshi Takeuchi ,  Masaru Nomura

发明人： Junsaku Nakajima ,  Hitoshi Takeuchi ,  Masaru Nomura

IPC分类号： G11B7/00

CPC分类号： G11B7/0943 ,  G11B7/005 ,  G11B7/0053 ,  G11B7/00736 ,  G11B7/0901 ,  G11B7/0938 ,  G11B7/0941 ,  G11B7/131 ,  G11B7/24085 ,  G11B7/24088 ,  G11B20/00086 ,  G11B20/00405 ,  G11B20/00594 ,  G11B20/1217 ,  G11B27/24

摘要： On an optical disc including a substrate on which pits having at least two different depths are formed, main information is recorded by the shape of the pits and additional information is recorded by the depth of the pit. It is possible to reverse polarity of a tangential push-pull signal dependent on the depth of the pit, and therefore it becomes possible to record information utilizing the depth of the pit. This improves recording density of the optical disc. Further, when information of the optical disc is to be copied, the information recorded by the depth of the pit cannot be copied. Therefore, unauthorized reproduction can be prevented.

摘要翻译： 在包括其上形成有至少两个不同深度的凹坑的基板的光盘上，通过凹坑的形状记录主信息，并且通过凹坑的深度记录附加信息。 可以根据凹坑的深度反转切向推挽信号的极性，因此可以利用凹坑的深度来记录信息。 这提高了光盘的记录密度。 此外，当要复制光盘的信息时，不能复制由凹坑的深度记录的信息。 因此，可以防止未授权的再现。

公开(公告)号：US06396775B1

公开(公告)日：2002-05-28

申请号：US09513827

申请日：2000-02-25

申请人： Junsaku Nakajima

发明人： Junsaku Nakajima

IPC分类号： G11B1100

CPC分类号： B82Y10/00 ,  G11B7/1372 ,  G11B7/1387 ,  G11B7/22 ,  G11B11/10547 ,  G11B11/10554 ,  G11B11/10576 ,  G11B11/1058

摘要： Light emitted from a light source is converged by an objective lens, and an auxiliary lens increases an effective numerical aperture to project the light on a recording medium. The temperature of a recording mark recording on the recording medium is increased by the projection of the light, and saturation magnetization which is in accordance with the information is generated, thus generating magnetic flux. There is a reproducing magnetic layer, which is provided on the auxiliary lens. Magnetization generated on the reproducing magnetic layer has an effect on the polarization direction of the reflected light at the reproducing magnetic layer. Reflected light from the reproducing magnetic layer reaches a photodetector to generate a reproduced signal.

摘要翻译： 从光源发射的光由物镜会聚，辅助透镜增加有效的数值孔径，将光投射到记录介质上。 记录介质上的记录标记的温度由于光的投射而增加，产生与信息相符的饱和磁化强度，从而产生磁通量。 存在设置在辅助透镜上的再现磁性层。 在再现磁性层上产生的磁化对再现磁性层上的反射光的偏振方向具有影响。 来自再现磁性层的反射光到达光电检测器以产生再现信号。

公开(公告)号：US06317280B1

公开(公告)日：2001-11-13

申请号：US09159700

申请日：1998-09-24

申请人： Junsaku Nakajima ,  Takeshi Yamaguchi

发明人： Junsaku Nakajima ,  Takeshi Yamaguchi

IPC分类号： G11B502

CPC分类号： G11B5/127 ,  G11B5/00 ,  G11B5/012 ,  G11B5/02 ,  G11B5/105 ,  G11B5/3967 ,  G11B5/4886 ,  G11B5/82 ,  G11B11/10595 ,  G11B13/045 ,  G11B2005/0005 ,  G11B2005/0021

摘要： A thermomagnetic recording and reproducing head includes a floating slider, and a heating head, a reproduction-use magnetic head as an MR head and a recording-use magnetic head as a thin-film inductive head mounted on the floating slider in this order from an upstream side of a track. The heating section of the heating head is formed by boron nitride or ruthenium oxide, and has a width narrower than the widths of the reproduction-use magnetic head and recording-use magnetic head. Moreover, the recording layer of a disk medium is made from an N-type ferrimagnetic material, the coercive force of the recording layer at a recording temperature and saturation magnetization thereof at a reproduction temperature are adjusted, and the compensation temperature of the recording layer is adjusted to be substantially room temperature. The thermomagnetic recording and reproducing head can realize a narrow track without decreasing the widths of the recording-use magnetic head and reproduction-use magnetic head, thereby increasing the track density.

摘要翻译： 热磁记录和再现头包括浮动滑块和加热头，作为MR磁头的再现用磁头和作为安装在浮动滑动器上的薄膜感应头的记录用磁头， 轨道的上游侧。 加热头的加热部由氮化硼或氧化钌形成，其宽度比再现用磁头和记录用磁头的宽度窄。 此外，磁盘介质的记录层由N型亚铁磁材料制成，记录层的记录温度下的矫顽磁力和再生温度下的饱和磁化被调整，记录层的补偿温度为 调节至大致室温。 热磁记录和再现头可以在不减小记录用磁头和再现用磁头的宽度的情况下实现窄轨迹，从而增加轨道密度。

公开(公告)号：US06212137B1

公开(公告)日：2001-04-03

申请号：US09324266

申请日：1999-06-02

申请人： Junsaku Nakajima

发明人： Junsaku Nakajima

IPC分类号： G11B1100

CPC分类号： G11B11/10554 ,  G11B11/10584 ,  G11B11/10586

摘要： A storage medium includes at least a storage layer, a non-magnetic layer, a storage supplementary layer, an anti-oxidation layer, and a ferromagnetism material layer provided in this or reverse order on a substrate. Owing to a magnetic field produced by the storage supplementary layer with an external magnetic field and the concentration of a magnetic flux caused by the ferromagnetism material layer, the magnetic field is strengthened at the position of the storage layer, and the magnetic field sensitivity of the storage medium is improved. In a magneto-optical disc device, an optical head having an objective lens and a magnetic head having a coil are disposed on the same side with respect to the storage medium to store information onto the storage medium.

摘要翻译： 存储介质至少包括在基板上以这种或相反的顺序设置的存储层，非磁性层，存储辅助层，抗氧化层和铁磁性材料层。 由于由具有外部磁场的存储辅助层产生的磁场和由铁磁性材料层引起的磁通浓度，磁场在存储层的位置被增强，并且磁场灵敏度 存储介质得到改进。 在磁光盘装置中，具有物镜的光头和具有线圈的磁头设置在与存储介质相同的一侧，以将信息存储到存储介质上。

公开(公告)号：US06760299B1

公开(公告)日：2004-07-06

申请号：US09606282

申请日：2000-06-29

申请人： Junsaku Nakajima ,  Hitoshi Takeuchi ,  Masaru Nomura

发明人： Junsaku Nakajima ,  Hitoshi Takeuchi ,  Masaru Nomura

IPC分类号： G11B700

CPC分类号： G11B7/0943 ,  G11B7/005 ,  G11B7/0053 ,  G11B7/00736 ,  G11B7/0901 ,  G11B7/0938 ,  G11B7/0941 ,  G11B7/131 ,  G11B7/24085 ,  G11B7/24088 ,  G11B20/00086 ,  G11B20/00405 ,  G11B20/00594 ,  G11B20/1217 ,  G11B27/24

摘要： On an optical disc including a substrate on which pits having at least two different depths are formed, main information is recorded by the shape of the pits and additional information is recorded by the depth of the pit. It is possible to reverse polarity of a tangential push-pull signal dependent on the depth of the pit, and therefore it becomes possible to record information utilizing the depth of the pit. This improves recording density of the optical disc. Further, when information of the optical disc is to be copied, the information recorded by the depth of the pit cannot be copied. Therefore, unauthorized reproduction can be prevented.

公开(公告)号：US06487165B1

公开(公告)日：2002-11-26

申请号：US09596483

申请日：2000-06-19

申请人： Junsaku Nakajima

发明人： Junsaku Nakajima

IPC分类号： G11B724

CPC分类号： G11B7/24085 ,  G11B7/00718 ,  G11B7/00745

摘要： In an optical recording medium in which marks are allowed to be written at grooves and information has been recorded beforehand in the form of prepits in a prepit area, the medium is constructed so that the groove width, Wg, the land width, Wl, and the prepit width, Wp, satisfy the relationships of either Wl Wg, and Wp>Wg. Alternatively or additionally to the above, a sum of lengths of pit-presence portions in the prepit area is larger than a sum of lengths of pit-absence portions in the prepit area.

摘要翻译： 在允许在凹槽中写入标记的光学记录介质中，并且事先已经在预凹坑区域中以预凹坑的形式记录了信息，该介质被构造成使得槽宽Wg，焊盘宽度W1和 前置宽度Wp满足Wl Wg，Wp> Wg的关系。 或者或另外地，预制区域中的凹坑存在部分的长度之和大于预凹坑区域中凹坑缺陷部分的长度之和。

公开(公告)号：US06438098B1

公开(公告)日：2002-08-20

申请号：US09706825

申请日：2000-11-07

申请人： Junsaku Nakajima ,  Masaru Nomura ,  Hitoshi Takeuchi

发明人： Junsaku Nakajima ,  Masaru Nomura ,  Hitoshi Takeuchi

IPC分类号： G11B700

CPC分类号： G11B7/24085 ,  G11B7/00718 ,  G11B7/00745 ,  G11B7/0901 ,  G11B7/0906 ,  G11B7/0938

摘要： An optical recording medium capable of obtaining a large reproduced signal from the recoded mark, a large reproduced signal of a pre-pit and a large tracking signal both in an area of the grooves and an area of the pre-pits, which provides a sufficient time allowance for switching tracking to that suitable for the area of the grooves or to that suitable for the area of the pre-pits. An optical recording medium comprising a substrate whereon tracks each comprising at least of writable grooves and pre-pits deeper than or equal to the grooves are formed and areas of a relatively shallow pits are each provided between an area of the deep pits and an area of the grooves. The depth Dg of the grooves, the depth Dsp of the shallow pits and the depth Ddp of the deep pits satisfy the following conditions: Dg

摘要翻译： 一种能够从重新编码的标记获得大的再现信号的光学记录介质，在凹槽的区域和预制凹坑的区域中的预制凹坑的大的再现信号和大的跟踪信号，其提供足够的 切换跟踪的时间容限适合于槽的区域或适合于预制坑的区域。 一种光记录介质，其特征在于，包括基板，其中，所述基板的轨道各自包括至少可写入的凹槽，并且凹槽深度大于或等于所述凹槽，并且所述凹坑的深度大于或等于所述凹槽的预凹坑，并且相对较浅的凹坑的区域各自设置在所述深凹坑的区域和 凹槽。 凹槽的深度Dg，浅凹坑的深度Dsp和深坑的深度Ddp满足以下条件：Dg