公开(公告)号：US07750276B2

公开(公告)日：2010-07-06

申请号：US11852361

申请日：2007-09-10

申请人： Harukazu Miyamoto ,  Hideharu Mikami ,  Takeshi Shimano

发明人： Harukazu Miyamoto ,  Hideharu Mikami ,  Takeshi Shimano

IPC分类号： G02B27/40

CPC分类号： G11B7/1356 ,  G11B7/005 ,  G11B7/13 ,  G11B2007/0013

摘要： In multilayer optical discs and high-speed optical discs, the amount of reproduction light per unit time greatly decreases and the reproduction signal quality (S/N) significantly drops due to the low effective reflectivity and the short read time of the medium. These problems are solved by causing reflected signal light from the optical disc and reference light, which is separated from the same light source and introduced into a detector without being shone onto the optical disc, to interference with each other on the detector. Detector outputs having four different interference states are simultaneously obtained, the interference states being displaced at intervals of 90° in terms of the phase relationship between the reference light and the signal. Based on a operation of the four detector outputs, a reproduction signal can be obtained that is stable at all times and amplified with high quality, even when there is an optical path length variation due to disc undulations.

摘要翻译： 在多层光盘和高速光盘中，由于介质的有效反射率低和读取时间短，每单位时间的再现光量大大降低，再现信号质量（S / N）显着下降。 这些问题通过使来自光盘的反射信号光和从相同光源分离并被引入检测器而不被照射到光盘上的参考光在检测器上彼此干涉来解决。 同时获得具有四种不同干扰状态的检测器输出，以参考光和信号之间的相位关系为90°的间隔移位干涉状态。 基于四个检测器输出的操作，即使当由于盘起伏而导致光程长度变化时，也可以始终获得稳定的高质量放大的再现信号。

公开(公告)号：US07639588B2

公开(公告)日：2009-12-29

申请号：US11669223

申请日：2007-01-31

申请人： Shigeharu Kimura ,  Takeshi Shimano

发明人： Shigeharu Kimura ,  Takeshi Shimano

IPC分类号： G11B7/00

CPC分类号： G11B7/1367 ,  G11B7/131 ,  G11B7/1362 ,  G11B7/1381 ,  G11B7/1392 ,  G11B2007/0013

摘要： The amount of reflected light from an adjacent layer in a multilayer optical disc is reduced by means of a combination of half-wave plates having different optical axes and a flat mirror. The polarization direction of the reflected light from a target layer is changed without changing the polarization direction of reflected light from the adjacent layer so as to detect a signal from the target layer alone. Because no stray light is introduced into the tracking error signal or focus signal, the laser light irradiated position can be controlled with high accuracy. This makes it possible to accurately determine the laser irradiated position during reading and writing, thereby enhancing signal quality. Because no reflected light from the adjacent layer is introduced into the data signal, a data signal with reduced error can be obtained.

摘要翻译： 通过具有不同光轴的半波片和平面镜的组合来减少来自多层光盘中的相邻层的反射光的量。 改变来自目标层的反射光的偏振方向，而不改变来自相邻层的反射光的偏振方向，从而仅检测来自目标层的信号。 由于没有杂散光被引入到跟踪误差信号或聚焦信号中，因此可以高精度地控制激光照射位置。 这使得可以在读取和写入期间准确地确定激光照射位置，从而提高信号质量。 由于没有将来自相邻层的反射光引入到数据信号中，所以可以获得具有减小的误差的数据信号。

公开(公告)号：US07616532B2

公开(公告)日：2009-11-10

申请号：US11529346

申请日：2006-09-29

申请人： Shigeo Nakamura ,  Takeshi Shimano ,  Masaya Horino ,  Irizo Naniwa ,  No-Cheol Park ,  Jeonghoon Yoo ,  Dong-Ju Lee ,  Jeseung Oh ,  Chul Park

发明人： Shigeo Nakamura ,  Takeshi Shimano ,  Masaya Horino ,  Irizo Naniwa ,  No-Cheol Park ,  Jeonghoon Yoo ,  Dong-Ju Lee ,  Jeseung Oh ,  Chul Park

IPC分类号： G11B7/00

CPC分类号： G11B7/08576 ,  G11B7/0933 ,  G11B7/0935

摘要： A small-sized optical disc drive includes one voice coil motor magnet within which a tracking coil and two focusing coils are disposed such that the tracking coil straddles the two poles of permanent magnets that are adjacently disposed. The two focusing coils are disposed on either side of the tracking coil, with each of the two focusing coils being only disposed over one of the permanent magnets.

摘要翻译： 小型光盘驱动器包括一个音圈电动机磁体，其中设置有跟踪线圈和两个聚焦线圈，使得跟踪线圈横跨相邻设置的永磁体的两极。 两个聚焦线圈设置在跟踪线圈的任一侧，两个聚焦线圈中的每一个仅设置在一个永磁体上。

公开(公告)号：US20090129238A1

公开(公告)日：2009-05-21

申请号：US12188297

申请日：2008-08-08

申请人： Takeshi Shimano ,  Masaki Mukoh

发明人： Takeshi Shimano ,  Masaki Mukoh

IPC分类号： G11B7/135

CPC分类号： G11B7/1374 ,  G11B7/13925 ,  G11B2007/0006

摘要： A combined aspherical lens has an aspherical shape with an intermediate substrate thickness between the substrate thicknesses of a BD and an HD in a numerical aperture (NA) range for the HD, and an aspherical shape dedicated to the BD in an NA range for the BD only. The lens is designed such that wave aberration occurring through the NA range for the HD for BD reproduction has the same aberration form as but has an opposite sign to wave aberration occurring through this range for HD reproduction. Further, in the NA range for the HD, a pattern of annular transparent electrodes is optimized for a spherical aberration wavefront defocused to minimize the maximum inclination of the wave aberration. A phase shift applied is within plus or minus half wave excluding an integer wavelength of aberration.

摘要翻译： 组合的非球面透镜具有非球面形状，在HD的数值孔径（NA）范围内具有在BD的基板厚度和HD之间的衬底厚度之间的中间衬底厚度，以及在BD的NA范围内专用于BD的非球面形状 只要。 透镜被设计成使得通过用于BD再现的HD的NA范围发生的波像差具有与HD再现的该范围所出现的波像差相同的像差形式。 此外，在HD的NA范围内，环形透明电极的图案被优化用于散焦的球面像差波前，以最小化波像差的最大倾角。 施加的相移在除了整数像差波长之外的正或负半波之内。

公开(公告)号：US20090052303A1

公开(公告)日：2009-02-26

申请号：US12222886

申请日：2008-08-19

申请人： Masaki Mukoh ,  Takeshi Shimano

发明人： Masaki Mukoh ,  Takeshi Shimano

IPC分类号： G11B7/00

CPC分类号： G11B7/1369 ,  G11B7/13925 ,  G11B2007/0006

摘要： Two optical discs used with a laser light having the same wavelength but having different substrate thicknesses can be handled by a single optical disc apparatus and a multilayer optical disc can also be reproduced. A refractive lens unit and liquid crystal elements are provided so as to condense laser light on an optical disc having a thin substrate thickness with a first NA and to condense laser light on an optical disc having a thick substrate thickness with a second NA smaller than the first NA. The refractive lens unit is designed such that the amount of RMS wavefront aberration is minimized with respect to an intermediate substrate thickness between the two optical discs in the range of the second NA; and the RMS wavefront aberration is 0.05λ or less with respect to the substrate thickness of the optical disc in an area outside the second NA. A liquid crystal element for compatibility corrects spherical aberration due to the difference in substrate thickness between the two optical discs. A liquid crystal element for multilayer corrects spherical aberration based on layer selection of a multilayer optical disc.

摘要翻译： 与具有相同波长但具有不同基板厚度的激光一起使用的两个光盘可以由单个光盘装置处理，并且也可以再现多层光盘。 提供折射透镜单元和液晶元件，以便将激光冷凝在具有第一NA的薄的基板厚度的光盘上，并且将激光聚集在具有厚的基板厚度的光盘上，其中第二NA小于 第一个NA。 折射透镜单元被设计成使得在第二NA的范围内相对于两个光盘之间的中间基板厚度使RMS波前像差的量最小化; 相对于第二NA以外的区域的光盘的基板厚度，RMS波前像差为0.05λ以下。 用于兼容性的液晶元件由于两个光盘之间的基板厚度的差异而校正球面像差。 用于多层校正球面像差的液晶元件基于多层光盘的层选择。

公开(公告)号：US20080219109A1

公开(公告)日：2008-09-11

申请号：US11780058

申请日：2007-07-19

申请人： Takeshi Maeda ,  Takeshi Shimano ,  Akemi Hirotsune ,  Harukazu Miyamoto

发明人： Takeshi Maeda ,  Takeshi Shimano ,  Akemi Hirotsune ,  Harukazu Miyamoto

IPC分类号： G11B7/00

CPC分类号： G11B7/0037 ,  G11B7/004 ,  G11B7/00552 ,  G11B7/00736 ,  G11B7/0938 ,  G11B7/24038 ,  G11B2007/0013

摘要： Provided is a recording and retrieval apparatus for a multi-layer optical disk. A multi-layer optical disk in which a plurality of recording layers and a single servo layer are combined to form a set is used. A spot for the servo layer and a spot for the recording layers are turned on in a time-sharing manner. Servo signal detection areas are formed discretely in the servo layer. The servo signal detection areas and data recording areas are provided so as not to overlap each other when viewed from the spot incident side. Thus, separation of data from each of the layers can be done by even a single photodetector without interference.

摘要翻译： 提供了一种用于多层光盘的记录和取回装置。 使用其中组合多个记录层和单个伺服层以形成集合的多层光盘。 伺服层的一个点和记录层的一个点以分时的方式被打开。 伺服信号检测区域离散地形成在伺服层中。 伺服信号检测区域和数据记录区域被设置成当从点入射侧观察时彼此不重叠。 因此，即使单个光电检测器也可以不干扰地从每层分离数据。

公开(公告)号：US20080127238A1

公开(公告)日：2008-05-29

申请号：US11704953

申请日：2007-02-12

申请人： Shigeharu Kimura ,  Takeshi Shimano

发明人： Shigeharu Kimura ,  Takeshi Shimano

IPC分类号： G11B7/08 ,  G11B7/00

CPC分类号： G11B7/1378 ,  G11B7/0903 ,  G11B7/1362 ,  G11B2007/0013

摘要： The adverse influence of reflected light from adjacent layers as stray light on a control signal or data signal is reduced when tracking a multilayered optical disc using differential push-pull method. The reflected light from the optical disc including stray light from an adjacent layer is once condensed with a condenser lens having little aberration and is then reflected by a reflecting mirror having a partial reflecting region. The resultant reflected light, which has the influence of stray light reduced, passes through a polarization beam splitter and becomes incident on a four-quadrant detector (for main beam) and a split detector (for sub beam) via a condenser lens having astigmatic aberration.

摘要翻译： 当使用差分推挽方法跟踪多层光盘时，来自相邻层的反射光作为杂散光对控制信号或数据信号的不良影响降低。 来自包括来自相邻层的杂散光的来自光盘的反射光一旦与具有很小像差的聚光透镜一起聚焦，然后被具有部分反射区域的反射镜反射。 所产生的受杂散光影响的反射光通过偏振分束器并通过具有散光像差的聚光透镜入射到四象限检测器（用于主光束）和分割检测器（用于子光束） 。

公开(公告)号：US20070274171A1

公开(公告)日：2007-11-29

申请号：US11746681

申请日：2007-05-10

申请人： Takeshi Shimano ,  Harukazu Miyamoto

发明人： Takeshi Shimano ,  Harukazu Miyamoto

IPC分类号： G11B7/00

CPC分类号： G11B7/1362 ,  G11B7/1356 ,  G11B7/1365

摘要： Provided is an optical disc apparatus including an interference-type optical disk signal detection system, which allows an optical path difference between two kinds of light to be controlled easily, which has a high signal amplification effect, and which is suitable for miniaturization of an optical system. An interference-type optical system is integrally formed to stabilize an optical path difference between signal light and reference light. At the same time, means for controlling an optical path length of the reference light is attached to a reference mirror, and thereby controls signal amplitude so as to be constantly set the maximum in response to a change in the optical path length with time due to a variation in the thickness of a cover layer of an optical disk, a temperature and the like. Moreover, the optical system is miniaturized by using a Twyman-Green type interference optical system.

摘要翻译： 提供了一种包括干涉型光盘信号检测系统的光盘装置，其能够容易地控制两种光之间的光路差异，其具有高的信号放大效应，并且适合于光学的小型化 系统。 整体形成干涉型光学系统，以稳定信号光与参考光之间的光程差。 同时，用于控制参考光的光程长度的装置附加到参考反射镜，从而控制信号幅度，以便随着时间的流逝随时间的变化而恒定地设定最大值 光盘的覆盖层的厚度的变化，温度等。 此外，通过使用Twyman-Green型干涉光学系统，光学系统被小型化。

公开(公告)号：US20070223325A1

公开(公告)日：2007-09-27

申请号：US11698108

申请日：2007-01-26

申请人： Shigeo Nakamura ,  Takeshi Shimano ,  Irizo Naniwa ,  No-Cheol Park ,  Jeonghoon Yoo ,  Hyun Seok Yang ,  Dong-Ju Lee ,  Heoksoo Hong

发明人： Shigeo Nakamura ,  Takeshi Shimano ,  Irizo Naniwa ,  No-Cheol Park ,  Jeonghoon Yoo ,  Hyun Seok Yang ,  Dong-Ju Lee ,  Heoksoo Hong

IPC分类号： G11B7/00

CPC分类号： G11B7/08576 ,  G11B7/0933 ,  G11B7/0935

摘要： There is provided a compact optical disc apparatus having a small footprint actuator. A tracking coil of a swing arm-type actuator is disposed substantially perpendicular to an arm and on the opposite side to an optical disc loading slot with respect to the line connecting the center of rotation of the optical disc to the center of swing movement of the actuator. A pair of permanent magnets are disposed such that they face the tracking coil and they are opposite in polarity. The tracking coil is disposed on both the permanent magnets such that the tracking coil straddles the boundary of the pair of permanent magnets.

摘要翻译： 提供了一种具有小占位面积致动器的紧凑型光盘装置。 摆臂式致动器的跟踪线圈基本上垂直于臂，并且在相对于将光盘的旋转中心连接到光盘的旋转中心的线的光盘装载槽的相对侧上布置 执行器。 一对永磁体被设置为使得它们面对跟踪线圈并且它们的极性相反。 跟踪线圈设置在两个永磁体上，使得跟踪线圈跨越一对永磁体的边界。

公开(公告)号：US20070171557A1

公开(公告)日：2007-07-26

申请号：US11716616

申请日：2007-03-12

申请人： Takeshi Shimano ,  Masatoshi Kanamaru ,  Masaya Horino

发明人： Takeshi Shimano ,  Masatoshi Kanamaru ,  Masaya Horino

IPC分类号： G02B5/08

CPC分类号： G11B7/08576 ,  G11B7/123 ,  G11B7/1374

摘要： A method of manufacturing an optical head includes joining of a first substrate on which a plurality of lenses are formed in an array, a second substrate on which a plurality of prisms and mirrors are formed in an array, and a third substrate on which a plurality of detectors and light sources are formed in an array, after positioning of the individual substrates, and cutting the joined substrates along the rows and columns of the array.

摘要翻译： 一种光学头的制造方法包括以阵列形式形成有多个透镜的第一基板与其上形成有多个棱镜和反射镜的第二基板的接合，在该第二基板上形成有多个透镜 检测器和光源在定位各个基板之后以阵列形成，并且沿阵列的行和列切割连接的基板。