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155 条记录 (耗时 0.023 秒)

    Focusing time period and power control of a multilaser diode array
    1.
    发明授权
    Focusing time period and power control of a multilaser diode array 失效
    聚焦时间段和多极二极管阵列的功率控制

    公开(公告)号：US5671209A

    公开(公告)日：1997-09-23

    申请号：US559432

    申请日：1995-11-15

    申请人： Yuichi Kamioka ,  Kenji Koishi ,  Daisuke Ogata ,  Shigeru Furumiya

    发明人： Yuichi Kamioka ,  Kenji Koishi ,  Daisuke Ogata ,  Shigeru Furumiya

    IPC分类号： G11B7/00 ,  G11B7/004 ,  G11B7/09 ,  G11B7/125 ,  G11B7/14 ,  H01S5/0683 ,  H01S5/40

    CPC分类号： G11B7/126 ,  H01S5/0683 ,  G11B7/0908 ,  G11B7/14 ,  H01S5/4025

    摘要： A method for controlling intensities of a plurality of laser beams respectively emitted on a track of an optical disk by a plurality of laser diodes according to the present invention includes a step of performing focusing servo control for focusing one of the plurality of laser beams emitted by one of the plurality of laser diodes onto the track, and concurrently controlling an intensity of the laser beam emitted by each of plurality of laser diodes to be within a predetermined range by comparing a signal which is in accordance with an intensity of the laser beam emitted by that laser beam with a reference signal. A period during which the one of the plurality of laser diodes used for the focusing does not emit the one laser beam is shorter than a response time of the focus servo control.

    摘要翻译： 根据本发明的用于控制由多个激光二极管分别发射在光盘的轨道上的多个激光束的强度的方法包括以下步骤：执行聚焦伺服控制以聚焦由 将多个激光二极管中的一个放射到轨道上，并且通过比较与发射的激光束的强度相对应的信号，同时将由多个激光二极管中的每一个发射的激光束的强度控制在预定范围内 该激光束具有参考信号。 用于聚焦的多个激光二极管中的一个不发射一个激光束的周期比聚焦伺服控制的响应时间短。

    Method and apparatus for controlling a slice signal in the reproduction information recorded in an optical disk
    8.
    发明授权
    Method and apparatus for controlling a slice signal in the reproduction information recorded in an optical disk 失效
    用于控制记录在光盘中的再现信息中的切片信号的方法和装置

    公开(公告)号：US5831951A

    公开(公告)日：1998-11-03

    申请号：US831944

    申请日：1997-04-02

    申请人： Yuichi Kamioka ,  Shigeru Furumiya ,  Yuji Hisakado

    发明人： Yuichi Kamioka ,  Shigeru Furumiya ,  Yuji Hisakado

    IPC分类号： G11B7/00 ,  G11B7/005 ,  G11B11/105 ,  G11B20/10 ,  G11B5/09

    CPC分类号： G11B7/005 ,  G11B20/10009 ,  G11B11/10595

    摘要： When information is reproduced from an optical disk, a comparator compares a reproduced signal with a slice signal to generate binarized signals, while the slice signal is corrected continuously for external disturbances in a reproduced signal. A switch changes the time constant of the frequency response of the slice signal according to the reproduced signal. For example, the frequency response of the slice signal is set faster in a first region in a prepit area of the disk and in a record area of the disk so that the slice level converges quickly, while the frequency response is changed thereafter to a low time constant for normal signals. Thus, inaccuracy in binarization of the reproduced image signal is minimized, and the sector format is performed efficiently.

    摘要翻译： 当从光盘再现信息时，比较器将再现信号与片信号进行比较，以产生二值化信号，同时对再生信号中的外部干扰连续校正片信号。 开关根据再现信号改变切片信号的频率响应的时间常数。 例如，切片信号的频率响应在盘的预凹坑区域的第一区域和盘的记录区域中设置得更快，使得限幅电平快速收敛，而频率响应此后改变为低 正常信号的时间常数。 因此，再现图像信号的二值化的不准确被最小化，并且有效地执行扇区格式。

    Optical information recording/reproducing method and optical information recording/reproducing apparatus
    9.
    发明授权
    Optical information recording/reproducing method and optical information recording/reproducing apparatus 失效
    光信息记录/再现方法和光信息记录/再现装置

    公开(公告)号：US06510116B1

    公开(公告)日：2003-01-21

    申请号：US09493102

    申请日：2000-01-28

    申请人： Naoyasu Miyagawa ,  Takashi Ishida ,  Junichi Minamino ,  Kenji Koishi ,  Shigeru Furumiya

    发明人： Naoyasu Miyagawa ,  Takashi Ishida ,  Junichi Minamino ,  Kenji Koishi ,  Shigeru Furumiya

    IPC分类号： G11B509

    CPC分类号： G11B7/00456 ,  G11B7/00736 ,  G11B7/24085 ,  G11B20/10009 ,  G11B20/10481 ,  G11B2020/1275 ,  G11B2220/2537

    摘要： When data is reproduced by an apparatus which is different from an apparatus used for recording the data, the fluctuation of edge positions of the reproducing data increases, making reproduction incompatible, and the present invention solves this problem. The present invention comprises reproducing learning means 13 and 24 for switching a frequency characteristic of the reproducing system, which detects the changes of the local optical constant, to a predetermined frequency characteristic, and recording learning means 20 for correcting the start edge or end edge position of the recording pulse for each combination of length of a mark block and length of the preceding or subsequent space, so that the edge position of the binarized reproducing data comes to a desired position, and since the frequency characteristic of the reproducing system is unified before learning the edge shift amount caused by the thermal interference between marks, the length of the recorded marks and spaces can always be constant, which improves the reproducing compatibility among reproducing apparatuses.

    摘要翻译： 当通过与用于记录数据的装置不同的装置再现数据时，再现数据的边缘位置的波动增加，使得再现不兼容，并且本发明解决了这个问题。 本发明包括用于将检测局部光学常数的变化的再现系统的频率特性切换到预定频率特性的再现学习装置13和24，以及用于校正起始边缘或结束边缘位置的记录学习装置20 对于标记块的长度和前一或后续空格的长度的每个组合的记录脉冲，使得二值化再现数据的边缘位置到达期望位置，并且由于再现系统的频率特性在 学习由标记之间的热干扰引起的边缘偏移量，记录的标记和间隔的长度总是恒定的，这提高了再现装置之间的再现兼容性。

    Optical disk system
    10.
    发明授权
    Optical disk system 失效
    光盘系统

    公开(公告)号：US5400315A

    公开(公告)日：1995-03-21

    申请号：US165560

    申请日：1993-12-13

    申请人： Kenji Koishi ,  Yoshinari Takemura ,  Shigeru Furumiya

    发明人： Kenji Koishi ,  Yoshinari Takemura ,  Shigeru Furumiya

    IPC分类号： H04N5/85 ,  G11B7/00 ,  G11B7/004 ,  G11B20/10 ,  H04N5/92 ,  H04N9/79 ,  H04N9/82

    CPC分类号： H04N9/8216 ,  H04N9/7904

    摘要： An analog-to-digital converter executes analog-to-digital conversion of a first analog video signal at a predetermined sampling frequency "fs". A time base converter converts a time base of an output signal from the analog-to-digital converter at a predetermined time base conversion frequency "ftci". A digital output signal from the time base converter is converted into a corresponding second analog video signal in response to a clock signal of a frequency corresponding to the frequency "ftci". The second analog video signal is converted into an FM video signal recorded on a video region of an optical disk. A binary audio digital signal is converted into a multi-level form digital audio signal. The binary audio digital signal has a data rate corresponding to the frequency "ftci". The multi-level form digital audio signal has a data rate "ftci/n" and 2.sup.n discrete amplitude levels where "n" denotes a predetermined integer. The multi-level form digital audio signal is converted into a corresponding analog audio signal in response to the clock signal of the frequency corresponding to the frequency "ftci". The analog audio signal is converted into an FM audio signal recorded on an audio region of the optical disk. A data signal generator generates a digital data signal at a data rate "ftci/m" where "m" denotes a predetermined integer. The digital data signal is converted into a corresponding analog data signal in response to the clock signal of the frequency corresponding to the frequency "ftci". The analog data signal is converted into an FM data signal recorded on a data region of the optical disk.

    摘要翻译： 模数转换器以预定的采样频率“fs”执行第一模拟视频信号的模数转换。 时基转换器以预定的时基转换频率“ftci”转换来自模数转换器的输出信号的时基。 响应于与频率“ftci”对应的频率的时钟信号，来自时基转换器的数字输出信号被转换成对应的第二模拟视频信号。 第二模拟视频信号被转换成记录在光盘的视频区域上的FM视频信号。 二进制音频数字信号被转换为多电平形式的数字音频信号。 二进制音频数字信号具有对应于频率“ftci”的数据速率。 多级形式数字音频信号具有数据速率“ftci / n”和2n个离散幅度电平，其中“n”表示预定的整数。 响应于对应于频率“ftci”的频率的时钟信号，多级形式的数字音频信号被转换成相应的模拟音频信号。 模拟音频信号被转换成记录在光盘的音频区域上的FM音频信号。 数据信号发生器以数据速率“ftci / m”生成数字数据信号，其中“m”表示预定的整数。 响应于对应于频率“ftci”的频率的时钟信号，将数字数据信号转换成对应的模拟数据信号。 模拟数据信号被转换成记录在光盘的数据区域上的FM数据信号。