公开(公告)号：US08830803B2

公开(公告)日：2014-09-09

申请号：US12853523

申请日：2010-08-10

申请人： Tetsuya Nishiyama ,  Takashi Kikukawa

发明人： Tetsuya Nishiyama ,  Takashi Kikukawa

IPC分类号： G11B7/00 ,  G11B27/36 ,  G11B20/10 ,  G11B7/09 ,  G11B7/085 ,  G11B7/095

CPC分类号： G11B7/0906 ,  G11B7/08511 ,  G11B7/0903 ,  G11B7/0956 ,  G11B20/10009 ,  G11B20/10527 ,  G11B2007/0013

摘要： An optical drive apparatus that reproduces an optical disk having a land and a groove, the optical drive apparatus including a first tracking-error-signal generating unit that generates a first tracking error signal by using a DPD method, a second tracking-error-signal generating unit that generates a second tracking error signal by using a DPP method, a tracking servo unit that controls the optical system, and a determining unit that determines that an irradiation point of an optical beam is in a non-recorded area. The tracking servo unit switches over to a control based on the second tracking error signal in response to a result of determination by the determining unit during performing a control based on the first tracking error signal.

摘要翻译： 一种再现具有平台和凹槽的光盘的光驱动装置，所述光驱动装置包括通过使用DPD方法产生第一跟踪误差信号的第一跟踪误差信号产生单元，第二跟踪误差信号 生成单元，其通过使用DPP方法产生第二跟踪误差信号，控制光学系统的跟踪伺服单元以及确定光束的照射点在非记录区域中的确定单元。 响应于在执行基于第一跟踪误差信号的控制期间由确​​定单元确定的结果，跟踪伺服单元基于第二跟踪误差信号切换到控制。

公开(公告)号：US08518515B2

公开(公告)日：2013-08-27

申请号：US13277472

申请日：2011-10-20

申请人： Takashi Kikukawa ,  Motohiro Inoue ,  Atsuko Kosuda ,  Tomoki Ushida

发明人： Takashi Kikukawa ,  Motohiro Inoue ,  Atsuko Kosuda ,  Tomoki Ushida

IPC分类号： G11B7/24

CPC分类号： G11B7/24038 ,  G11B7/2578 ,  G11B2007/24312 ,  G11B2007/24314 ,  G11B2007/2432

摘要： The multilayer optical recording medium with at least four or more recording and reading layers disposed one above the other has at least two or more recording and reading layer groups each including the recording and reading layers successively disposed one above the other. In adjacent recording and reading layer groups with an intermediate layer interposed therebetween, a recording and reading layer nearest a front side in the recording and reading layer group nearer a back side is higher than the higher value of the reflectances in a stacked state of two recording and reading layers nearest the back side in the recording and reading layer group nearer the front side.

摘要翻译： 具有至少四个或更多个记录和读取层的多层光学记录介质具有至少两个或更多个记录和读取层组，每个记录和读取层组包括相继地彼此重叠的记录和读取层。 在介于其间的中间层的相邻的记录和读取层组中，靠近记录和读取层组最靠近前侧的记录和读取层高于两次记录的堆叠状态下的反射率的较高值 并且在记录和读取层组中最靠近背面的读取层更靠近正面。

公开(公告)号：US08409686B2

公开(公告)日：2013-04-02

申请号：US12882281

申请日：2010-09-15

申请人： Hiroyasu Inoue ,  Takashi Kikukawa ,  Koji Mishima ,  Yoshiaki Komma ,  Joji Anzai ,  Jun Nakano ,  Manami Miyawaki ,  Shigeki Takagawa

发明人： Hiroyasu Inoue ,  Takashi Kikukawa ,  Koji Mishima ,  Yoshiaki Komma ,  Joji Anzai ,  Jun Nakano ,  Manami Miyawaki ,  Shigeki Takagawa

IPC分类号： B32B3/02

CPC分类号： G11B7/24038 ,  Y10T428/21

摘要： An optical recording medium having three or more information recording layers reduces crosstalk caused by multi-reflected beams and improves signal quality. In the optical recording medium having three or more information recording layers, the refractive index of a plurality of intermediate layers disposed between adjacent information recording layers is greater than the refractive index of a cover layer disposed between a light incident surface and an information recording layer being the closest from the light incident surface.

摘要翻译： 具有三个或更多个信息记录层的光记录介质减少了由多反射光束引起的串扰并提高了信号质量。 在具有三个以上信息记录层的光记录介质中，设置在相邻信息记录层之间的多个中间层的折射率大于设置在光入射表面和信息记录层之间的覆盖层的折射率， 最靠近光入射面。

公开(公告)号：US20120201110A1

公开(公告)日：2012-08-09

申请号：US13365341

申请日：2012-02-03

申请人： Motohiro Inoue ,  Tomoki Ushida ,  Atsuko Kosuda ,  Takashi Kikukawa

发明人： Motohiro Inoue ,  Tomoki Ushida ,  Atsuko Kosuda ,  Takashi Kikukawa

IPC分类号： G11B7/00 ,  B21D39/03 ,  G11B7/24

CPC分类号： G11B7/0903 ,  G11B7/09 ,  G11B7/1267 ,  G11B7/14 ,  G11B7/24018 ,  G11B7/2403 ,  G11B7/24038 ,  G11B7/2405 ,  G11B7/24079

摘要： An optical recording medium includes a recording and reading layer that is previously staked or formed afterward and has no concavo-convex pattern for tracking control, and a servo layer in which a concavo-convex pattern or a groove for tracking control is formed. Information can be recorded in the recording and reading layer while tracking is performed using the servo layer.

摘要翻译： 光记录介质包括预先在之后被放样或形成并且没有用于跟踪控制的凹凸图案的记录和读取层，以及其中形成有凹凸图案或用于跟踪控制的凹槽的伺服层。 当使用伺服层执行跟踪时，信息可以被记录在记录和读取层中。

公开(公告)号：US20120102509A1

公开(公告)日：2012-04-26

申请号：US13277458

申请日：2011-10-20

申请人： Motohiro INOUE ,  Takashi Kikukawa ,  Atsuko Kosuda ,  Tomoki Ushida ,  Hideki Hirata

发明人： Motohiro INOUE ,  Takashi Kikukawa ,  Atsuko Kosuda ,  Tomoki Ushida ,  Hideki Hirata

IPC分类号： G11B7/24

CPC分类号： G11B7/24038 ,  G11B2007/24314 ,  G11B2007/2432

摘要： The multilayer optical recording medium with six or more recording and reading layers disposed one above the other has at least two or more recording and reading layer groups. The recording and reading layer groups each include a plurality of recording and reading layers successively disposed one above the other. The reflectance of each of the recording and reading layers in a stacked state decreases in the order from a front side near a light incident surface toward a back side far from the light incident surface. A recording and reading layer nearest the front side among the recording and reading layers in the recording and reading layer group nearer the back side has a reflectance in a stacked state higher than that of a recording and reading layer nearest the back side among the recording and reading layers in the recording and reading layer group nearer the front side.

摘要翻译： 具有六个或更多个记录和读取层的多层光记录介质具有至少两个或更多个记录和读取层组。 记录和读取层组各自包括相继地彼此排列的多个记录和读取层。 层叠状态下的各记录层和读取层的反射率从靠近光入射面的前侧向远离光入射面的背面逐渐减小。 记录和读取层组中靠近背面的记录和读取层之间的记录和读取层的记录和读取层的堆叠状态的反射率高于记录和记录层中最靠背侧的记录和读取层的反射率， 阅读层组在阅读层组中靠近正面。

公开(公告)号：US20120069727A1

公开(公告)日：2012-03-22

申请号：US13307040

申请日：2011-11-30

申请人： Takashi KIKUKAWA

发明人： Takashi KIKUKAWA

IPC分类号： G11B27/36 ,  G11B7/1374

CPC分类号： G11B20/10009 ,  G11B20/10055 ,  G11B20/10101 ,  G11B20/1012 ,  G11B20/10481 ,  G11B2220/2537

摘要： A method for evaluating a read signal obtained by irradiating a medium with a laser beam through an objective lens and reading data from the reflected laser beam by a PRML detection method is provided. The method includes: a sampling step of sampling the data obtained from the reflected laser beam at clock timings to obtain sampled values; and a step of, when a constraint length of a PR class in the PRML detection method is an even number, computing an intermediate sampled value for evaluation using at least adjacent two of the sampled values arranged in the order sampled at the clock timings. The provided method is an objective evaluation method when the PRML detection method is used, whereby the selection of a recording medium and a reading apparatus is facilitated.

摘要翻译： 提供了一种用于评估通过用物镜照射激光束的介质并通过PRML检测方法从反射的激光束读取数据而获得的读取信号的方法。 该方法包括：采样步骤，在时钟定时对从反射激光束获得的数据进行采样，以获得采样值; 以及当PRML检测方法中的PR类的约束长度是偶数时，使用在时钟定时采样的顺序中排列的至少相邻的两个采样值来计算用于评估的中间采样值的步骤。 所提供的方法是当使用PRML检测方法时的客观评价方法，由此便于对记录介质和读取装置的选择。

公开(公告)号：US20100296377A1

公开(公告)日：2010-11-25

申请号：US12864437

申请日：2009-01-27

申请人： Koji Mishima ,  Hiroyasu Inoue ,  Takashi Kikukawa ,  Tetsuya Nishiyama

发明人： Koji Mishima ,  Hiroyasu Inoue ,  Takashi Kikukawa ,  Tetsuya Nishiyama

IPC分类号： G11B27/36

CPC分类号： G11B7/268 ,  G01B11/06 ,  G11B7/00375 ,  G11B7/24038

摘要： A multilayer optical recording medium having three or more information recording layers is irradiated with a laser beam, and a first signal obtained from the reflected laser beam is subjected to a frequency filter. A second signal obtained by filtration through a high-pass filter is used to evaluate the characteristics of the multilayer optical recording medium. In this manner, even in a multilayer optical recording medium having three or more information recording layers, the influence of the variation of the thickness and material of the information recording layers and the influence of the variation of the thickness of a spacer layer can be clearly determined and evaluated.

摘要翻译： 用激光束照射具有三个以上信息记录层的多层光记录介质，对从反射激光束得到的第一信号进行频率滤波。 使用通过高通滤波器过滤获得的第二信号来评估多层光学记录介质的特性。 以这种方式，即使在具有三个或更多个信息记录层的多层光学记录介质中，信息记录层的厚度和材料的变化的影响以及间隔层的厚度的变化的影响也可以是清楚的 确定和评估。

公开(公告)号：US07787334B2

公开(公告)日：2010-08-31

申请号：US11998549

申请日：2007-11-30

申请人： Takashi Kikukawa ,  Koji Mishima ,  Tsutomu Aoyama ,  Hidetake Itoh

发明人： Takashi Kikukawa ,  Koji Mishima ,  Tsutomu Aoyama ,  Hidetake Itoh

IPC分类号： G11B7/00

CPC分类号： G11B7/007 ,  G11B7/0045 ,  G11B7/24038 ,  G11B7/24085 ,  G11B20/1883 ,  G11B2007/0013 ,  G11B2220/20 ,  G11B2220/215 ,  G11B2220/235 ,  G11B2220/2537

摘要： When there is a defect area in a specific recording layer, recording of information is continued and reduction in a recording rate is restrained. In an optical recording method for recording information on a multilayer optical recording medium having a plurality of recording layers by irradiating the recording layer with a beam spot, any recording layer is set as an escape recording layer. When a defect area is detected while information is recorded on another recording layer except for the escape recording layer, the beam spot moves to the escape recording layer to continue recording the information.

摘要翻译： 当在特定记录层中存在缺陷区域时，继续记录信息并抑制记录速率的降低。 在通过用光斑照射记录层而在具有多个记录层的多层光学记录介质上记录信息的光学记录方法中，将任何记录层设置为逃逸记录层。 当在除了逃逸记录层之外的另一记录层上记录信息时检测到缺陷区域时，光束点移动到逃逸记录层以继续记录信息。

公开(公告)号：US20100143637A1

公开(公告)日：2010-06-10

申请号：US12580721

申请日：2009-10-16

申请人： Yoshiaki KOMMA ,  Joji Anzai ,  Hiroyasu Inoue ,  Takashi Kikukawa ,  Koji Mishima ,  Jun Nakano ,  Manami Miyawaki ,  Shigeki Takagawa

发明人： Yoshiaki KOMMA ,  Joji Anzai ,  Hiroyasu Inoue ,  Takashi Kikukawa ,  Koji Mishima ,  Jun Nakano ,  Manami Miyawaki ,  Shigeki Takagawa

IPC分类号： B32B3/02 ,  G11B7/26

CPC分类号： G11B7/24038 ,  G11B7/1376 ,  G11B7/13925 ,  Y10T428/21

摘要： An object of the invention is to provide an optical recording medium and a method for producing an optical recording medium that enable to improve the quality of a servo signal and a reproduction signal. The optical recording medium satisfies: t3−t4≧1 μm, t4−t2≧1 μm, t2≧10 μm, and t1−(t2+t3+t4)≧1 μm, where t1 is a thickness between a surface of the optical recording medium, and the first information recording surface, t2 is a thickness between the first optical recording surface and the second information recording surface, t3 is a thickness between the second optical recording surface and the third information recording surface, and t4 is a thickness between the third optical recording surface and the fourth information recording surface.

摘要翻译： 本发明的目的是提供一种能够提高伺服信号和再现信号的质量的光学记录介质和光学记录介质的制造方法。 光记录介质满足：t3-t4≥1μm，t4-t2≥1μm，t2≥10μm，t1-（t2 + t3 + t4）≥1μm，其中t1是光学表面之间的厚度 记录介质，第一信息记录表面，t2是第一光学记录表面和第二信息记录表面之间的厚度，t3是第二光学记录表面和第三信息记录表面之间的厚度，t4是 第三光学记录表面和第四信息记录表面。

公开(公告)号：US20090135711A1

公开(公告)日：2009-05-28

申请号：US12352304

申请日：2009-01-12

申请人： Takashi KIKUKAWA ,  Tatsuya Kato ,  Hajime Utsunomiya ,  Hiroshi Shingai

发明人： Takashi KIKUKAWA ,  Tatsuya Kato ,  Hajime Utsunomiya ,  Hiroshi Shingai

IPC分类号： G11B7/00

CPC分类号： G11B7/005 ,  G11B7/1263 ,  G11B7/24

摘要： An information readout method for an optical information medium comprising an information recording layer having pits or recorded marks representative of information data involves the step of irradiating a laser beam to the information recording layer through an objective lens for providing readings of the pits or recorded marks. When the laser beam has a wavelength λ of 400 to 410 nm, the objective lens has a numerical aperture NA of 0.70 to 0.85, and the pits or recorded marks have a minimum size PL of up to 0.36λ/NA, readout is carried out at a power Pr of at least 0.4 mW for the laser beam. When the laser beam has a wavelength λ of 630 to 670 nm, the objective lens has a numerical aperture NA of 0.60 to 0.65, and the pits or recorded marks have a minimum size PL of up to 0.36λ/NA, readout is carried out at a power Pr of at least 1.0 mW for the laser beam. Pits or recorded marks of a size approximate to the resolution limit determined by diffraction can be read out at a high C/N.

摘要翻译： 包括具有表示信息数据的凹坑或记录标记的信息记录层的光信息介质的信息读出方法包括通过用于提供凹坑或记录标记的读数的物镜将激光束照射到信息记录层的步骤。 当激光束具有400至410nm的波长λ时，物镜的数值孔径NA为0.70至0.85，并且凹坑或记录标记具有高达0.36λ/ NA的最小尺寸PL，读出被执行 在激光束的功率Pr为至少0.4mW。 当激光束具有630至670nm的波长λ时，物镜的数值孔径NA为0.60至0.65，并且凹坑或记录的标记具有高达0.36λ/ NA的最小尺寸PL，读出被执行 在激光束的功率Pr为至少1.0mW。 通过衍射确定的大小接近分辨率极限的刻痕或记录标记可以高C / N读出。