利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

139 条记录 (耗时 0.025 秒)

    Jitter measurement apparatus detecting amplitude of phase errors between information signal and synchronized clock signal
    41.
    发明授权
    Jitter measurement apparatus detecting amplitude of phase errors between information signal and synchronized clock signal 失效
    抖动测量装置检测信息信号和同步时钟信号之间相位误差的幅度

    公开(公告)号：US5663942A

    公开(公告)日：1997-09-02

    申请号：US429681

    申请日：1995-04-27

    申请人： Hiromichi Ishibashi ,  Motoyuki Kobayashi ,  Mitsurou Moriya

    发明人： Hiromichi Ishibashi ,  Motoyuki Kobayashi ,  Mitsurou Moriya

    IPC分类号： G11B7/09 ,  G11B19/04 ,  G11B20/10 ,  G11B7/00 ,  G11B5/09

    CPC分类号： G11B20/10 ,  G11B19/04 ,  G11B7/094 ,  G11B7/0941 ,  G11B7/0908

    摘要： A read-out information signal read out from an optical disk carrier is digitized, thereby detecting an amplitude of an absolute value of a phase error between the read-out information signal and a synchronized clock signal. The synchronized clock signal is obtained by using a phase locked loop constituted by a phase detector having two outputs, that is, a phase lead and a phase lag, and a VCO operating at an average value of a differential signal representing a difference between the two outputs. A phase error amplitude is detected from a sum signal representing a sum of the two outputs of this phase detector. By appropriately displacing a focus actuator in a state where a focus control is performed, an offset compensation amount where the phase error amplitude becomes minimum is obtained.

    摘要翻译： 从光盘载体读出的读出信息信号被数字化，从而检测读出的信息信号和同步的时钟信号之间的相位误差的绝对值的幅度。 同步时钟信号通过使用由具有两个输出的相位检测器（即，相位超前和相位滞后）构成的锁相环以及以表示两者之间的差的差分信号的平均值工作的VCO来获得 输出。 从表示该相位检测器的两个输出的和的和信号中检测出相位误差幅度。 通过在执行聚焦控制的状态下适当地移动聚焦致动器，获得相位误差幅度变为最小的偏移补偿量。

    Optical reproducing device, optical reproducing method using the same, and optical record medium used in the same
    42.
    发明授权
    Optical reproducing device, optical reproducing method using the same, and optical record medium used in the same 失效
    光学再现装置，使用该光学再现装置的光学再现方法及其中使用的光学记录介质

    公开(公告)号：US5610879A

    公开(公告)日：1997-03-11

    申请号：US206752

    申请日：1994-03-07

    申请人： Mitsurou Moriya ,  Hiromichi Ishibashi ,  Takeo Ohta ,  Yasuhiro Sugihara

    发明人： Mitsurou Moriya ,  Hiromichi Ishibashi ,  Takeo Ohta ,  Yasuhiro Sugihara

    IPC分类号： G11B7/005 ,  G11B7/125 ,  G11B7/24 ,  G11B7/09

    CPC分类号： G11B7/126 ,  G11B7/005 ,  G11B7/24

    摘要： A record medium according to the present invention includes a substrate having concave or convex information pits and a thermosensitive material film formed on the substrate. The thermosensitive material film is changed from a high reflectance state to a low reflectance state when its temperature becomes a high level and returns to the high reflectance state when its temperature decreases to a low level. In the case where information is reproduced, when a light beam having a predetermined power is irradiated to the record medium, heat generated by the light beam is confined in the pits and the temperature in the pits increases; the thermosensitive material on the pits becomes the low reflectance state. The flat portions between the pits has high heat radiation and thus, the temperature in the flat portions does not increase so much; therefore, the state of the thermosensitive material film on the flat portions is not changed. Thus, an optical power of reflected light from the pits to which a light beam is irradiated is decreased, so that an amplitude of a reproduced signal is increased.

    摘要翻译： 根据本发明的记录介质包括具有凹或凹信息凹坑的衬底和形成在衬底上的热敏材料膜。 当其温度变为高电平时，热敏材料膜从高反射率状态变为低反射率状态，并且当其温度降低到低水平时，返回到高反射率状态。 在再现信息的情况下，当将具有预定功率的光束照射到记录介质上时，由光束产生的热量被限制在凹坑中并且凹坑中的温度增加; 凹坑上的热敏材料变成低反射率状态。 凹坑之间的平坦部分具有高热辐射，因此平坦部分中的温度不会增加太多; 因此，平坦部分上的热敏材料膜的状态不变。 因此，来自照射光束的凹坑的反射光的光功率减小，使得再现信号的幅度增加。

    Optical information recording disk having embossed clock mark pits and embossed information recording pits
    43.
    发明授权
    Optical information recording disk having embossed clock mark pits and embossed information recording pits 失效
    具有压纹时钟标记凹坑和压花信息记录凹坑的光学信息记录盘

    公开(公告)号：US5295131A

    公开(公告)日：1994-03-15

    申请号：US769823

    申请日：1991-10-02

    申请人： Hiromichi Ishibashi ,  Mitsuro Moriya

    发明人： Hiromichi Ishibashi ,  Mitsuro Moriya

    IPC分类号： G11B7/0045 ,  G11B7/0055 ,  G11B7/09 ,  G11B7/24

    CPC分类号： G11B7/0938 ,  G11B7/0045 ,  G11B7/00557 ,  G11B7/24

    摘要： In a first optical disk, a plurality of sets of bit information record cells, each cell including a plurality of bit information record cells, and a plurality of clock marks are formed along a track line on a substrate, and the bit information record cells are formed for example as pits, wherein the recording or reading of a bit of information to or from the bit information record cells is effected with a laser head. The information record cells are arranged at mutual intervals smaller than the minimum read distance of the laser head, while the clock marks are provided so as to have a distance from a set of bit information record cell which is larger than the minimum read distance of the laser head so that the clock marks can be recognized by the laser head to be used for synchronization. Then, the recording density can be improved. In a second optical disk, track recognition marks are arranged as d spiral at equiangular distances so that there are an odd number of track recognition marks per track unit. Thus, even if the track pitch is on the order of the minimum read distance, the distance between adjacent wobble marks becomes is about double the minimum read distance so that the wobble marks can be recognized independently for tracking error detection.

    摘要翻译： 在第一光盘中，沿着基板上的轨迹线形成多组位信息记录单元，包括多个位信息记录单元的每个单元和多个时钟标记，并且位信息记录单元是 形成为例如凹坑，其中利用激光头实现对位信息记录单元的位信息的记录或读取。 信息记录单元被布置成小于激光头的最小读取距离的相互间隔，而时钟标记被设置成与一组比特信息记录单元的距离大于最小读取距离 激光头，使得时钟标记可以由激光头识别以用于同步。 然后，可以提高记录密度。 在第二光盘中，轨道识别标记以等角距离布置为d螺旋，使得每个轨道单元存在奇数个轨道识别标记。 因此，即使轨道间距是最小读取距离的顺序，相邻摆动标记之间的距离变成约为最小读取距离的两倍，从而可以独立地识别摆动标记以进行跟踪误差检测。

    Encoding/decoding system for optical recording/reading
    45.
    发明授权
    Encoding/decoding system for optical recording/reading 失效
    用于光学记录/读取的编码/解码系统

    公开(公告)号：US5008669A

    公开(公告)日：1991-04-16

    申请号：US383153

    申请日：1989-07-19

    申请人： Hiromichi Ishibashi ,  Shinichi Tanaka

    发明人： Hiromichi Ishibashi ,  Shinichi Tanaka

    IPC分类号： G11B20/14 ,  H03M7/14

    CPC分类号： G11B20/1426

    摘要： A system for encoding/decoding an 8-bit binary code into/from a 4/11 channel code is disposed such that an 8-bit binary code is encoded into a 11-bit channel code by adding a 3-bit extension code as a parity code which keeps the number of "1"s in the channel code at four. When the 8-bit binary code cannot be encoded by this rule, it is converted to a temporary 8-bit code by a table encoder and then a 3-bit extension code is added. The 4/11 channel code is decoded referring to the 3-bit extension code, which indicates the encoding rule by which the 4/11 channel code has been generated. When the 4/11 channel code is detected to have been encoded by the bits-adding rule, an original 8-bit binary code is derived from the 4/11 code by removing the 3-bit extension code. When the 4/11 channel code has been encoded by the table-encoding rule, it is decoded by a table decoder.

    Optical head with easily adjustable collimator having two lens components
    46.
    发明授权
    Optical head with easily adjustable collimator having two lens components 失效
    具有容易调整的准直器的光学头具有两个透镜部件

    公开(公告)号：US4823334A

    公开(公告)日：1989-04-18

    申请号：US935309

    申请日：1986-11-26

    申请人： Shinichi Tanaka ,  Hiromichi Ishibashi

    发明人： Shinichi Tanaka ,  Hiromichi Ishibashi

    IPC分类号： G11B7/09 ,  G11B7/135 ,  G11B7/00

    CPC分类号： G11B7/1376

    摘要： An optical head for a recording/reproducing apparatus optically recording and/or reading information onto or from a recording medium, collimates a divergent light beam radiated from a light source into a parallel light beam using a collimator lens comprised of the first and second lenses. Collimation can precisely be adjusted by adjusting only the position of second lens. The first lens is a positive lens. The second lens has a power less than the total power of the collimator lens. Collimation adjustment can be done with extreme accuracy even when disposing a prism in the path of the parallel light beam.

    摘要翻译： 用于在记录介质上或从记录介质读取信息的记录/再现设备的光学头将使用由第一和第二透镜构成的准直透镜将从光源辐射的发散光束准直成平行光束。 准直可以通过调整第二个镜头的位置来精确调整。 第一个镜头是正镜头。 第二透镜的功率小于准直透镜的总功率。 即使在平行光束的路径中设置棱镜，也可以极高精度进行准直调整。

    Method for evaluating quality of read signal and apparatus for reading information
    47.
    发明授权
    Method for evaluating quality of read signal and apparatus for reading information 有权
    用于评估读取信号的质量的方法和用于读取信息的装置

    公开(公告)号：US08270542B2

    公开(公告)日：2012-09-18

    申请号：US12510419

    申请日：2009-07-28

    申请人： Takeshi Nakajima ,  Harumitsu Miyashita ,  Hiromichi Ishibashi ,  Shigeru Furumiya

    发明人： Takeshi Nakajima ,  Harumitsu Miyashita ,  Hiromichi Ishibashi ,  Shigeru Furumiya

    IPC分类号： H04L27/06

    CPC分类号： G11B20/1816

    摘要： A most probable path is selected from a number n (where n≧2) of paths of state transitions occurring from a first state Sk−j (where k≧3 and j≧2) at a time k−j into a second state Sk at a time k. The method includes the steps of detecting predetermined combinations of the first and second states Sk−j and Sk defining the n probable paths in a predetermined period j between the times k−j and k, and evaluating the reliability of a read signal, decoded in the period j, by |Pa−Pb|. Pa and Pb indicate the probabilities of state transition of first and second state transition paths in the period j. The first and second state transition paths are estimated to be the most probable and the second most probable, respectively, among the n probable paths defined by the combinations detected.

    摘要翻译： 从时刻k-j的第一状态Sk-j（其中k≥3和j≥2）发生的状态转换路径的数n（其中n≥2）中选择最可能的路径到第二状态Sk 在一个时间k。 该方法包括以下步骤：检测在时间k-j和k之间的预定周期j中定义n个可能路径的第一和第二状态Sk-j和Sk的预定组合，并且评估读取信号的可靠性， 周期j，由| Pa-Pb |​​。 Pa和Pb表示周期j中第一和第二状态转换路径的状态转移的概率。 估计第一和第二状态转换路径是由检测到的组合定义的n个可能路径中最可能和最可能的最可能的。