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35 条记录 (耗时 0.031 秒)

    Demodulation circuit for demodulating wobbling signal
    1.
    发明授权
    Demodulation circuit for demodulating wobbling signal 有权
    用于解调摆动信号的解调电路

    公开(公告)号：US06345018B1

    公开(公告)日：2002-02-05

    申请号：US09633227

    申请日：2000-08-04

    申请人： Hiroshi Maegawa ,  Toshihiro Shigemori

    发明人： Hiroshi Maegawa ,  Toshihiro Shigemori

    IPC分类号： G11B700

    CPC分类号： G11B27/24 ,  G11B7/0053 ,  G11B20/14 ,  G11B27/3027 ,  G11B2220/216 ,  G11B2220/2562

    摘要： A device for demodulating position information that is recorded as track wobbling in a record medium by a BPSK scheme includes a carrier-wave-generation circuit which derives a carrier wave from a wobbling signal obtained from the record medium, a phase-adjustment circuit which generates a phase-comparison signal having a 90° phase difference relative to the carrier wave, a multiplier which multiplies the wobbling signal and the phase-comparison signal to supply a product signal, and a detection circuit which detects a phase error of the carrier wave introduced by the carrier-wave-generation circuit by detecting the phase error between the wobbling signal and the phase-comparison signal based on the product signal.

    摘要翻译： 用于解调通过BPSK方式记录在记录介质中作为轨道摆动的位置信息的装置包括从从记录介质获得的摆动信号中导出载波的载波产生电路，产生 相位比较信号相对于载波具有90°的相位差;乘法器，用于将摆动信号和相位比较信号相乘以产生乘积信号;以及检测电路，其检测引入的载波的相位误差 由载波产生电路根据产品信号检测摆动信号和相位比较信号之间的相位误差。

    Wobble signal detection circuit and optical disk device
    3.
    发明授权
    Wobble signal detection circuit and optical disk device 失效
    摆动信号检测电路和光盘装置

    公开(公告)号：US06859425B2

    公开(公告)日：2005-02-22

    申请号：US10313036

    申请日：2002-12-06

    申请人： Hiroshi Maegawa ,  Toshihiro Shigemori

    发明人： Hiroshi Maegawa ,  Toshihiro Shigemori

    IPC分类号： G11B20/10 ,  G11B7/00 ,  G11B7/0045 ,  G11B7/005 ,  G11B7/007 ,  G11B7/09 ,  G11B7/095 ,  G11B19/247 ,  G11B27/24

    CPC分类号： G11B7/0045 ,  G11B7/0053 ,  G11B7/24082 ,  G11B27/24 ,  G11B2220/257

    摘要： An wobble signal detection circuit that is provided on an optical disk device and can detect a wobble signal having high accuracy and stability at least when recording information on an optical disk. This wobble signal detection circuit can be applied to plural types of optical recording media. With the wobble signal detection circuit, during a period for forming a space region, a first voltage signal provided from a first light receiving element is sampled and amplified to be a target voltage, a second voltage signal provided from a second light receiving element is sampled and amplified to be the target voltage. The difference between the two amplified signals are output as the wobble signal. The first and second light receiving elements are divided from each other in the direction tangential to a recording region on the optical recording medium.

    摘要翻译： 一种摆动信号检测电路，其设置在光盘装置上，并且至少在光盘上记录信息时能够检测出具有高精度和稳定性的摆动信号。 该摆动信号检测电路可以应用于多种类型的光记录介质。 利用摆动信号检测电路，在用于形成空间区域的时段期间，从第一光接收元件提供的第一电压信号被采样和放大为目标电压，从第二光接收元件提供的第二电压信号被采样 并放大为目标电压。 两个放大信号之间的差值作为摆动信号输出。 第一和第二光接收元件在与光记录介质上的记录区域相切的方向上彼此分开。

    Demodulation circuit for demodulating wobbling signal
    4.
    再颁专利
    Demodulation circuit for demodulating wobbling signal 有权
    用于解调摆动信号的解调电路

    公开(公告)号：USRE39513E1

    公开(公告)日：2007-03-13

    申请号：US10640282

    申请日：2003-08-14

    申请人： Hiroshi Maegawa ,  Toshihiro Shigemori

    发明人： Hiroshi Maegawa ,  Toshihiro Shigemori

    IPC分类号： G11B7/00 ,  G11B27/24 ,  G11B27/19 ,  G11B7/005 ,  G11B20/14

    CPC分类号： G11B27/24 ,  G11B7/0053 ,  G11B20/14 ,  G11B27/3027 ,  G11B2220/216 ,  G11B2220/2562

    摘要： A device for demodulating position information that is recorded as track wobbling in a record medium by a BPSK scheme includes a carrier-wave-generation circuit which derives a carrier wave from a wobbling signal obtained from the record medium, a phase-adjustment circuit which generates a phase-comparison signal having a 90° phase difference relative to the carrier wave, a multiplier which multiplies the wobbling signal and the phase-comparison signal to supply a product signal, and a detection circuit which detects a phase error of the carrier wave introduced by the carrier-wave-generation circuit by detecting the phase error between the wobbling signal and the phase-comparison signal based on the product signal.

    摘要翻译： 用于解调通过BPSK方式记录在记录介质中作为轨道摆动的位置信息的装置包括从从记录介质获得的摆动信号中导出载波的载波产生电路，产生 相位比较信号相对于载波具有90°的相位差;乘法器，用于将摆动信号和相位比较信号相乘以产生乘积信号;以及检测电路，其检测引入的载波的相位误差 由载波产生电路根据产品信号检测摆动信号和相位比较信号之间的相位误差。

    Optical pickup device, information reproduction/recording apparatus, and information processing apparatus
    7.
    发明授权
    Optical pickup device, information reproduction/recording apparatus, and information processing apparatus 有权
    光学拾取装置，信息再现/记录装置和信息处理装置

    公开(公告)号：US06741540B2

    公开(公告)日：2004-05-25

    申请号：US09736246

    申请日：2000-12-15

    申请人： Hiroshi Maegawa

    发明人： Hiroshi Maegawa

    IPC分类号： G11B700

    CPC分类号： G11B7/13 ,  G11B7/005

    摘要： The present invention provides an optical pickup device that is resistant to noise in a signal or an RF signal outputted from each light receiving member. Current signals outputted from the light receiving members are converted into voltage signals by I/V converters. The voltage signals are then added up by an adder, and then the added voltage signal is attenuated by an attenuator, so as to obtain an RF signal having the same signal level as the voltage signal outputted from each I/V converter. The RF signal is then transmitted from the optical pickup device to a circuit substrate through a signal line.

    摘要翻译： 本发明提供一种抵抗从每个光接收元件输出的信号或RF信号中的噪声的光拾取装置。 从光接收部件输出的电流信号由I / V转换器转换为电压信号。 然后通过加法器将电压信号相加，然后加上的电压信号被衰减器衰减，以便获得与每个I / V转换器输出的电压信号具有相同信号电平的RF信号。 然后，RF信号通过信号线从光拾取装置发送到电路基板。

    Phase-change optical disc recording method and apparatus, and information recording apparatus and recording pre-compensation method
    8.
    发明授权
    Phase-change optical disc recording method and apparatus, and information recording apparatus and recording pre-compensation method 失效
    相变光盘记录方法和装置，以及信息记录装置和记录预补偿方法

    公开(公告)号：US5648952A

    公开(公告)日：1997-07-15

    申请号：US536833

    申请日：1995-09-26

    申请人： Hiroshi Maegawa ,  Ikuo Aoki

    发明人： Hiroshi Maegawa ,  Ikuo Aoki

    IPC分类号： G11B7/0045 ,  G11B7/0055 ,  G11B7/006 ,  G11B7/125 ,  G11B7/00

    CPC分类号： G11B7/126 ,  G11B7/00454 ,  G11B7/00557 ,  G11B7/006

    摘要： A trial writing operation is performed on a phase-change optical disc using write and erase light-emitting powers, which together are varied according to predetermined variation ratios respectively. Signals relevant to said trial writing operation are reproduced from said disc. Optimum ones of the write and erase light-emitting powers are determined using the thus-reproduced signals. The predetermined variation ratios for the write and erase light-emitting powers may be the same as each other. Alternatively, the trial writing operation may be performed on a phase-change optical disc using write and erase light-emitting powers which are individually varied according to predetermined variation ratios respectively.

    摘要翻译： 使用写入和擦除发光功率在相变光盘上执行试用写入操作，它们一起根据预定的变化比变化。 与所述试写操作相关的信号从所述盘再现。 使用这样再生的信号来确定写入和擦除发光功率的最佳值。 写入和擦除发光功率的预定变化比可以彼此相同。 或者，可以在相变光盘上使用分别根据预定变化比单独变化的写入和擦除发光功率来执行试写操作。