公开(公告)号：US06246041B1

公开(公告)日：2001-06-12

申请号：US09182845

申请日：1998-10-29

申请人： Akihito Nakayama ,  Kenji Shintani ,  Shunsuke Kohama ,  Yukari Hashimoto

发明人： Akihito Nakayama ,  Kenji Shintani ,  Shunsuke Kohama ,  Yukari Hashimoto

IPC分类号： G02B2740

CPC分类号： G11B7/094 ,  G11B7/0945 ,  G11B2007/0006

摘要： A device for measuring focusing characteristics of an optical pickup and/or an optical disc capable of measuring characteristics of focusing states with high accuracy by a simplified circuit. An arithmetic-logic unit 12d controls an offset supplying circuit 23 for applying an offset voltage to a focusing servo control signal. This arithmetic-logic unit 12d detects an error rate of the playback data in such a state in which the focusing position of the laser light is deviated by a pre-set offset amount. The arithmetic-logic unit 12d sequentially varies the offset voltage to repeat the above processing for detecting the error rate. The arithmetic-logic unit 12d approximates the relationship of the error rate to the offset amount by a quadratic curve based on detected data. The offset amount which minimizes the error rate is found from this equation of approximation.

摘要翻译： 一种用于测量能够通过简化电路以高精度测量聚焦状态的特性的光学拾取器和/或光盘的聚焦特性的装置。 算术逻辑单元12d控制向聚焦伺服控制信号施加偏移电压的偏移供给电路23。 该算术逻辑单元12d在激光的聚焦位置偏移预设偏移量的状态下检测回放数据的错误率。 算术逻辑单元12d顺序地改变偏移电压，以重复上述用于检测错误率的处理。 算术逻辑单元12d基于检测到的数据，通过二次曲线近似误差率与偏移量的关系。 从这个近似方程式可以看出误差率最小化的偏移量。

公开(公告)号：US06366631B1

公开(公告)日：2002-04-02

申请号：US09150970

申请日：1998-09-11

申请人： Akihito Nakayama ,  Kenji Shintani ,  Shunsuke Kohama ,  Yukari Hashimoto

发明人： Akihito Nakayama ,  Kenji Shintani ,  Shunsuke Kohama ,  Yukari Hashimoto

IPC分类号： H04L700

CPC分类号： G01R29/26 ,  G11B20/10 ,  G11B20/1403

摘要： A jitter measurement device for reproducing a signal from an optical disc, which has simple circuit configuration and can effectively measure the jitter component. A matrix circuit 4 supplies the RF signals to the analog/digital converting circuit 6. Second, the computer 8 computes the slice level from the digitized data of the RF signals. Computer 8 computes the time point at which the RF signals become the indicated slice level, by interpolating, based on the digital data at the sampling point in the neighborhood of the said slice level, and the sampling frequency of the analog/digital converting circuit 6. A computer 8 computes each time breadth between the time points at which the RF signals become the slice level, then computes the jitter component of the reproduced signal, based on the each time breadth.

摘要翻译： 一种抖动测量装置，用于再现来自光盘的信号，其具有简单的电路配置并且可以有效地测量抖动分量。 矩阵电路4将RF信号提供给模拟/数字转换电路6.其次，计算机8根据RF信号的数字化数据计算限幅电平。 计算机8通过基于所述限幅电平附近的采样点处的数字数据和模拟/数字转换电路6的采样频率内插来计算RF信号变为指示的限幅电平的时间点 计算机8计算RF信号成为限幅电平的时间点之间的每个时间宽度，然后基于每个时间宽度来计算再现信号的抖动分量。

公开(公告)号：US06392967B1

公开(公告)日：2002-05-21

申请号：US09151643

申请日：1998-09-11

申请人： Akihito Nakayama ,  Kenji Shintani ,  Shunsuke Kohama ,  Yukari Hashimoto

发明人： Akihito Nakayama ,  Kenji Shintani ,  Shunsuke Kohama ,  Yukari Hashimoto

IPC分类号： G11B700

CPC分类号： G11B7/22 ,  G11B7/094 ,  G11B7/0945

摘要： The characteristic test device 1 supplies the output from the photo detector of the optical pickup 2, as signals A to F, directly to the sample hold circuits 8a-8f. The sample hold circuits 8a-8f, the multiplexer 9, and the second analog/digital converting circuit 10 convert the signals A to F into digital data with the sampling frequency of 50 KHz or more. In the computer 12, the processing division 12d reads out the indicated program from the data storage division 12b, where the program P for measuring the level of RF signal, is stored. The processing division 12d performs the operation of the indicated measurement items, based on the digital data stored in the second memory 11, then measures the characteristic of the optical pickup 2.

摘要翻译： 特征测试装置1将来自光学拾取器2的光电检测器的输出作为信号A至F直接提供给采样保持电路8a-8f。 采样保持电路8a-8f，多路复用器9和第二模拟/数字转换电路10将信号A至F转换为采样频率为50KHz或更大的数字数据。 在计算机12中，处理部分12d从存储有用于测量RF信号电平的程序P的数据存储部分12b读出指示的程序。 处理部分12d基于存储在第二存储器11中的数字数据执行所指示的测量项目的操作，然后测量光学拾取器2的特性。

公开(公告)号：US06226246B1

公开(公告)日：2001-05-01

申请号：US09182179

申请日：1998-10-29

申请人： Akihito Nakayama ,  Kenji Shintani ,  Shunsuke Kohama ,  Yukari Hashimoto ,  Hideo Kato

发明人： Akihito Nakayama ,  Kenji Shintani ,  Shunsuke Kohama ,  Yukari Hashimoto ,  Hideo Kato

IPC分类号： G11B390

CPC分类号： G11B7/0953 ,  G11B7/0901

摘要： A device for measuring characteristics of an optical pickup and/or an optical disc by which characteristics of tracking signals can be measured accurately in a noise-free manner. The measurement device 1 has a sample-and-hold circuit 8 and an analog-to-digital converter 10 for directly sampling an output of an optical pickup 2 as signals A to F in order to store the resulting digital data in a second memory 11. An arithmetic-logic unit 12d measures tracking error signals based on the digital data stored in the second memory 11. The arithmetic-logic unit 12d eliminates unstable portions of the tracking signals generated responsive to rotational eccentricity of the optical disc to find data.

摘要翻译： 用于测量光学拾取器和/或光盘的特性的装置，通过该装置可以以无噪声的方式精确地测量跟踪信号的特性。 测量装置1具有采样保持电路8和模拟数字转换器10，用于直接对光学拾取器2的输出进行采样作为信号A至F，以便将所得数字数据存储在第二存储器11中 算术逻辑单元12d基于存储在第二存储器11中的数字数据来测量跟踪误差信号。算术逻辑单元12d消除响应于光盘的旋转偏心产生的跟踪信号的不稳定部分以找到数据。

公开(公告)号：US6025907A

公开(公告)日：2000-02-15

申请号：US182905

申请日：1998-10-29

申请人： Akihito Nakayama ,  Kenji Shintani ,  Shunsuke Kohama ,  Yukari Hashimoto

发明人： Akihito Nakayama ,  Kenji Shintani ,  Shunsuke Kohama ,  Yukari Hashimoto

IPC分类号： G01M11/00 ,  G11B7/0037 ,  G11B7/095 ,  G11B7/12 ,  G11B7/22 ,  G11B7/26 ,  G01J1/00

CPC分类号： G11B7/22 ,  G11B7/0037 ,  G11B7/123

摘要： A device for measuring characteristic values of an optical pickup and/or an optical disc capable of detecting tracking signals for measuring characteristic values even if optical disc rotation is not subjected to eccentricity. The device for measuring characteristic values of an optical pickup and/or an optical disc 1 samples outputs of photodetectors of an optical pickup 2 as signals A to F directly by a sample-and-hold circuit 8 and an analog-to-digital converter 10 to store the resulting digital data in a second memory 11. An arithmetic-logic unit 12d measures tracking error signals based on the digital data stored in the second memory 11. A signal generating circuit 25 then sends a sine wave signal to a tracking coil 2b for moving the laser light illuminated on the optical disc along the radius of the disc.

摘要翻译： 一种用于测量光学拾取器和/或光盘的特性值的装置，其能够检测跟踪信号，用于测量特性值，即使光盘旋转不受偏心率的影响。 用于测量光学拾取器和/或光盘1的特征值的装置，通过采样保持电路8和模数转换器10直接将光拾取器2的光电检测器的输出作为信号A至F进行采样 以将所得到的数字数据存储在第二存储器11中。算术逻辑单元12d基于存储在第二存储器11中的数字数据来测量跟踪误差信号。然后，信号发生电路25将正弦波信号发送到跟踪线圈2b 用于沿光盘的半径移动照在光盘上的激光。