公开(公告)号：US07436746B2

公开(公告)日：2008-10-14

申请号：US10924445

申请日：2004-08-24

申请人： Akira Mashimo ,  Keishi Ueno

发明人： Akira Mashimo ,  Keishi Ueno

IPC分类号： G11B7/00

CPC分类号： G11B7/0956 ,  G11B7/00736 ,  G11B7/0938 ,  G11B7/0945 ,  G11B7/24085

摘要： A tilt detection system includes an optical disk having a series of data recorded therein, the series of data having a pulse width smaller than the minimum pulse width of data recorded in an ordinary optical disk; a reproducing part reproducing a signal from the optical disk by emitting a light beam onto the optical disk; and a tilt detecting part detecting a tilt of the light beam with respect to the optical disk based on a reproduced RF signal provided by the reproducing part when the series of data having the smaller pulse width is reproduced.

摘要翻译： 倾斜检测系统包括具有记录在其中的一系列数据的光盘，所述一系列数据具有小于记录在普通光盘中的数据的最小脉冲宽度的脉冲宽度; 再现部分通过将光束发射到光盘上来再现来自光盘的信号; 以及当再现具有较小脉冲宽度的一系列数据时，基于由再现部分提供的再现RF信号来检测光束相对于光盘的倾斜的倾斜检测部分。

公开(公告)号：US06999388B2

公开(公告)日：2006-02-14

申请号：US10131974

申请日：2002-04-24

申请人： Akira Mashimo ,  Chisato Takayama ,  Keishi Ueno

发明人： Akira Mashimo ,  Chisato Takayama ,  Keishi Ueno

IPC分类号： G11B7/00

CPC分类号： G11B7/0945 ,  G11B7/094

摘要： An optical disk apparatus capable of adjusting a focus servo and the like by precisely detecting a jitter amount. Light reflected from an optical disk is converted into an RF signal in an optical pickup and amplified by an RF amplifier before being supplied to an equalizer. The boost amount of the equalizer is set to zero during adjustment and set to a predetermined finite value (e.g., +20 dB) during normal recording and reproducing. By first setting the boost amount to zero, the delay characteristics of the RF signal from 3T to 11T are flattened such that an accurate jitter amount can be determined based on the integrated value of the phase differences of 3T to 11T, thereby allowing the optical pickup to be adjusted so as to minimize the jitter amount.

公开(公告)号：US20050025016A1

公开(公告)日：2005-02-03

申请号：US10924445

申请日：2004-08-24

申请人： Akira Mashimo ,  Keishi Ueno

发明人： Akira Mashimo ,  Keishi Ueno

IPC分类号： G11B7/095 ,  G11B7/00 ,  G11B7/007 ,  G11B7/08

CPC分类号： G11B7/0956 ,  G11B7/00736 ,  G11B7/0938 ,  G11B7/0945 ,  G11B7/24085

摘要： A tilt detection system includes an optical disk having a series of data recorded therein, the series of data having a pulse width smaller than the minimum pulse width of data recorded in an ordinary optical disk; a reproducing part reproducing a signal from the optical disk by emitting a light beam onto the optical disk; and a tilt detecting part detecting a tilt of the light beam with respect to the optical disk based on a reproduced RF signal provided by the reproducing-part when the series of data having the smaller pulse width is reproduced.

摘要翻译： 倾斜检测系统包括具有记录在其中的一系列数据的光盘，所述一系列数据具有小于记录在普通光盘中的数据的最小脉冲宽度的脉冲宽度; 再现部分通过将光束发射到光盘上来再现来自光盘的信号; 以及当再现具有较小脉冲宽度的一系列数据时，基于由再现部分提供的再现RF信号来检测光束相对于光盘的倾斜的倾斜检测部分。

公开(公告)号：US07983132B2

公开(公告)日：2011-07-19

申请号：US11584067

申请日：2006-10-20

申请人： Keishi Ueno

发明人： Keishi Ueno

IPC分类号： G11B20/00

CPC分类号： G11B20/10009

摘要： An optical disk apparatus for enhancing time resolution of an RF sum signal. A reproduction sum signal (a signal A+a signal D) on the leading side and a reproduction sum signal (a signal B+a signal C) on the following side, which have been output from a four-quadrant photodetection section of an optical pickup, are supplied to first and second A/D converters. The first A/D converter samples a signal in accordance with a first clock signal CLK, and the second A/D converter samples a signal in accordance with a second clock signal CLK. The first and second clock signals CLK are out of phase with each other. By means of a phase difference between the clock signals, a phase difference between the leading-side reproduction signals and the following-side reproduction signals is compensated for. The phase difference between the first and second clock signals CLK is adjusted such that the quality of a reproduction signal, such as jitter, an error rate, or the like, is optimized.

摘要翻译： 一种用于增强RF和信号的时间分辨率的光盘装置。 在前一侧的再现和信号（信号A +信号D）和从光学器件的四象限光电检测部分输出的后一侧的再现和信号（信号B + a信号C） 拾取，被提供给第一和第二A / D转换器。 第一A / D转换器根据第一时钟信号CLK对信号进行采样，并且第二A / D转换器根据第二时钟信号CLK对信号进行采样。 第一和第二时钟信号CLK彼此不同相。 通过时钟信号之间的相位差，补偿前端再现信号和后侧再现信号之间的相位差。 调整第一和第二时钟信号CLK之间的相位差，使得优化诸如抖动，错误率等的再现信号的质量。

公开(公告)号：US20080239899A1

公开(公告)日：2008-10-02

申请号：US12055211

申请日：2008-03-25

申请人： Keishi Ueno

发明人： Keishi Ueno

IPC分类号： G11B5/00

CPC分类号： G11B7/1267 ,  G11B7/00736

摘要： An optical disk drive sets optimum recording power responsive to recording linear speed. When data are recorded in an optical disk, data are managed for each recording unit block (RUB). An APC area is provided at the top of RUBs, and OPC is performed by use of the APC area, whereby optimum recording power responsive to recording linear speed is set. Tentative optimum recording power responsive to recording linear speed is set, and test data are written, for a try, in the APC area at recording power that is determined by increasing or decreasing the tentative optimum recording power by a trace amount. The optimum recording power is set in according with a β value obtained as a result of reproduction of the test data.

摘要翻译： 光盘驱动器响应于记录线速度设置最佳记录功率。 当数据记录在光盘中时，为每个记录单元块（RUB）管理数据。 在RUB的顶部设置有APC区域，并且通过使用APC区域来执行OPC，由此设置响应于记录线速度的最佳记录功率。 设置响应于记录线速度的暂定最佳记录功率，并且尝试在APC区域中以通过增加或减少临时最佳记录功率确定的记录功率来记录测试数据微量。 根据作为测试数据再现的结果获得的β值设定最佳记录功率。

公开(公告)号：US20080239889A1

公开(公告)日：2008-10-02

申请号：US12055205

申请日：2008-03-25

申请人： Keishi Ueno

发明人： Keishi Ueno

IPC分类号： G11B7/00

CPC分类号： G11B7/0053

摘要： A demodulation circuit accurately demodulates a wobble signal of an optical disk without being affected by a phase shift induced by crosstalk. An A-D converter subjects wobble signal reproduced from an optical disk to A-D conversion and feeds a result of conversion to a zero-crossing detection circuit. The zero-crossing detection circuit detects zero-crossing points of the wobble signal. A sinusoidal wave generation circuit generates a sinusoidal wave by means of sequentially connecting sinusoidal wave elements whose periods are each equal to a time interval between zero-crossing points. A multiplier multiplies an original wobble signal by a sinusoidal wave signal. A slicer detects an HMW-modulated portion of the wobble signal, and another slicer detects an MSK-modulated portion of the wobble signal.

摘要翻译： 解调电路在不受串扰引起的相移影响的情况下对光盘的摆动信号进行精确的解调。 A-D转换器将从光盘再现的摆动信号转换为A-D转换，并将转换结果馈送到过零检测电路。 过零检测电路检测摆动信号的过零点。 正弦波产生电路通过顺序连接周期等于过零点之间的时间间隔的正弦波元件来产生正弦波。 乘法器将原始摆动信号乘以正弦波信号。 切片器检测摆动信号的HMW调制部分，另一限幅器检测摆动信号的MSK调制部分。

公开(公告)号：US20070091747A1

公开(公告)日：2007-04-26

申请号：US11584067

申请日：2006-10-20

申请人： Keishi Ueno

发明人： Keishi Ueno

IPC分类号： G11B20/10

CPC分类号： G11B20/10009

摘要： An optical disk apparatus for enhancing time resolution of an RF sum signal. A reproduction sum signal (a signal A+a signal D) on the leading side and a reproduction sum signal (a signal B+a signal C) on the following side, which have been output from a four-quadrant photodetection section of an optical pickup, are supplied to first and second A/D converters. The first A/D converter samples a signal in accordance with a first clock signal CLK, and the second A/D converter samples a signal in accordance with a second clock signal CLK. The first and second clock signals CLK are out of phase with each other. By means of a phase difference between the clock signals, a phase difference between the leading-side reproduction signals and the following-side reproduction signals is compensated for. The phase difference between the first and second clock signals CLK is adjusted such that the quality of a reproduction signal, such as jitter, an error rate, or the like, is optimized.

摘要翻译： 一种用于增强RF和信号的时间分辨率的光盘装置。 在前一侧的再现和信号（信号A +信号D）和从光学器件的四象限光电检测部分输出的后一侧的再现和信号（信号B + a信号C） 拾取，被提供给第一和第二A / D转换器。 第一A / D转换器根据第一时钟信号CLK对信号进行采样，并且第二A / D转换器根据第二时钟信号CLK对信号进行采样。 第一和第二时钟信号CLK彼此不同相。 通过时钟信号之间的相位差，补偿前端再现信号和后侧再现信号之间的相位差。 调整第一和第二时钟信号CLK之间的相位差，使得优化诸如抖动，错误率等的再现信号的质量。

公开(公告)号：US08018798B2

公开(公告)日：2011-09-13

申请号：US12055205

申请日：2008-03-25

申请人： Keishi Ueno

发明人： Keishi Ueno

IPC分类号： G11B7/00

CPC分类号： G11B7/0053

摘要： A demodulation circuit accurately demodulates a wobble signal of an optical disk without being affected by a phase shift induced by crosstalk. An A-D converter subjects wobble signal reproduced from an optical disk to A-D conversion and feeds a result of conversion to a zero-crossing detection circuit. The zero-crossing detection circuit detects zero-crossing points of the wobble signal. A sinusoidal wave generation circuit generates a sinusoidal wave by means of sequentially connecting sinusoidal wave elements whose periods are each equal to a time interval between zero-crossing points. A multiplier multiplies an original wobble signal by a sinusoidal wave signal. A slicer detects an HMW-modulated portion of the wobble signal, and another slicer detects an MSK-modulated portion of the wobble signal.

摘要翻译： 解调电路在不受串扰引起的相移影响的情况下对光盘的摆动信号进行精确的解调。 A-D转换器将从光盘再现的摆动信号转换为A-D转换，并将转换结果馈送到过零检测电路。 过零检测电路检测摆动信号的过零点。 正弦波产生电路通过顺序连接周期等于过零点之间的时间间隔的正弦波元件来产生正弦波。 乘法器将原始摆动信号乘以正弦波信号。 切片器检测摆动信号的HMW调制部分，另一限幅器检测摆动信号的MSK调制部分。

公开(公告)号：US20100091627A1

公开(公告)日：2010-04-15

申请号：US12580095

申请日：2009-10-15

申请人： Keishi Ueno

发明人： Keishi Ueno

IPC分类号： G11B20/18

CPC分类号： G11B20/1816 ,  G11B2020/1823 ,  G11B2220/2537

摘要： There is provided an optical disk device which quickly inspects the presence or absence of a defect in an optical disk in order to ensure that it can be played back on various types of optical disk devices. A detection unit uses signals supplied from a playback unit to detect defects from each of an RF signal, a focus error signal, and a tracking error signal. A CPU stores positions of the defects in a memory. The playback unit plays back data while degrading playback conditions at the positions of the defects . The detection unit detects an error rate of the played-back data, and finally determines whether the optical disk is “OK” or “NG”.

摘要翻译： 提供了一种光盘装置，其可以快速检查光盘中是否存在缺陷，以确保可以在各种类型的光盘装置上重放。 检测单元使用从重放单元提供的信号来检测RF信号，聚焦误差信号和跟踪误差信号中的每一个的缺陷。 CPU将缺陷的位置存储在存储器中。 播放单元在缺陷的位置降低播放条件的同时重放数据。 检测单元检测重放数据的错误率，最后确定光盘是“OK”还是“NG”。

公开(公告)号：US20080074301A1

公开(公告)日：2008-03-27

申请号：US11859632

申请日：2007-09-21

申请人： Keishi Ueno

发明人： Keishi Ueno

IPC分类号： H03M1/12

CPC分类号： H03M1/1235 ,  H03M1/168 ,  H03M1/188 ,  H03M1/365 ,  H03M1/367 ,  H03M1/44

摘要： An A/D conversion circuit converts an asymmetric analogue signal into a digital signal. In an A/D conversion circuit of a parallel type, a central value of a reference voltage is adjusted by means of an average of an input analogue signal, such as a reproduced RF signal from an optical disk, or the like. The average value of the input analogue signal is detected by means of a low-pass filter (LPF). Respective comparators compare the input analogue signal with the reference voltage, and encodes a result of comparison by means of an encoder. An A/D conversion characteristic determined by voltage values from a maximum value Vref1 to an average value and another A/D conversion characteristic determined by voltage values from the average value to a minimum value Vref2 become nonlinear, thereby becoming able to address asymmetry of the input analogue signal.

摘要翻译： A / D转换电路将不对称模拟信号转换为数字信号。 在并行类型的A / D转换电路中，通过诸如来自光盘的再现的RF信号之类的输入模拟信号的平均值来调整参考电压的中心值。 通过低通滤波器（LPF）检测输入模拟信号的平均值。 相应的比较器将输入模拟信号与参考电压进行比较，并通过编码器对比较结果进行编码。 由从最大值Vref 1到平均值的电压值确定的A / D转换特性和由平均值至最小值Vref 2的电压值确定的另一个A / D转换特性变为非线性，从而变得能够解决不对称性 的输入模拟信号。