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    Reference clock generator for sampled servo type disk unit and disk unit
    1.
    发明授权
    Reference clock generator for sampled servo type disk unit and disk unit 失效
    用于采样伺服型磁盘单元和磁盘单元的参考时钟发生器

    公开(公告)号：US5526332A

    公开(公告)日：1996-06-11

    申请号：US263783

    申请日：1994-06-22

    申请人： Shin-iti Yamada ,  Mitsurou Moriya ,  Hiroyuki Yamaguchi ,  Toshiyuki Kinou

    发明人： Shin-iti Yamada ,  Mitsurou Moriya ,  Hiroyuki Yamaguchi ,  Toshiyuki Kinou

    IPC分类号： G11B7/007 ,  G11B7/09 ,  G11B20/14 ,  G11B27/30 ,  G06F1/04

    CPC分类号： G11B20/1403 ,  G11B27/3027 ,  G11B7/00745 ,  G11B7/0901 ,  G11B2220/20 ,  G11B7/0938

    摘要： In a reference clock signal generator for generating a sampled servo format reference clock signal using a PLL circuit, an unique distance is detected by an output signal of a VCO in a state the PLL circuit is operated based on a clock signal which corresponds to a number of rotations of a disk in generating the reference clock signal. When the unique distance is detected, a dividing ratio of a frequency divider is changed to operate the PLL circuit based on a clock mark detecting signal. The dividing ratio is set so that an oscillation frequency of the VCO becomes constant before and after switching from the clock signal that corresponds to the number of rotations of the disk to the clock mark signal. A count of the frequency divider is preset to zero with the first clock mark signal after the detection of the unique distance and the detection of the clock marks thereafter is carried out based on the count of the frequency divider.

    摘要翻译： 在用于使用PLL电路产生采样的伺服格式参考时钟信号的参考时钟信号发生器中，在PLL电路被操作的状态下，基于对应于数字的时钟信号的VCO的输出信号来检测唯一的距离 在产生参考时钟信号时盘的旋转。 当检测到唯一的距离时，改变分频器的分频比以基于时钟标记检测信号来操作PLL电路。 分频比被设定为使得在从与盘的转数相对应的时钟信号切换到时钟标记信号之前和之后，VCO的振荡频率变得恒定。 基于分频器的计数，在检测到唯一距离之后，利用第一时钟标记信号将分频器的计数预设为零，并且此后的时钟标记的检测被执行。

    Track retrieving method for making a light beam jump and scan from one track to another
    2.
    发明授权
    Track retrieving method for making a light beam jump and scan from one track to another 失效
    跟踪检索方法，使光束跳跃并从一个轨道扫描到另一个轨道

    公开(公告)号：US5566141A

    公开(公告)日：1996-10-15

    申请号：US226881

    申请日：1994-04-13

    申请人： Hiroyuki Yamaguchi ,  Mitsurou Moriya ,  Toshiyuki Kinou ,  Shinichi Yamada

    发明人： Hiroyuki Yamaguchi ,  Mitsurou Moriya ,  Toshiyuki Kinou ,  Shinichi Yamada

    IPC分类号： G11B7/007 ,  G11B7/085 ,  G11B11/105 ,  G11B17/22

    CPC分类号： G11B7/08517 ,  G11B7/00718 ,  G11B7/08529 ,  G11B11/10563

    摘要： A track retrieving method for making a light beam shift to a target track is provided in an apparatus in which at least one of a writing operation and a reading operation of information is performed to an information medium. A tracking control is applied to the information medium so as to make the light beam position on track. The information medium has tracks such that the polarity of the tracking control is alternately inverted between tracks. The method includes the steps of: making the light beam shift toward the target track, after the tracking control is made non-operational; and detecting a tracking error between the light beam and the track. The method also includes: generating a tracking error signal corresponding to the tracking error; generating a track middle-point signal for detecting a middle-point between adjacent tracks of the information medium based on a change of a polarity of a differentiation signal obtained by differentiating the tracking error signal; and generating a deceleration pulse for decelerating a shift of the light beam according to the track middle-point signal. The method also includes the steps of inverting the polarity of the tracking control before the deceleration pulse is completed, and again operating the tracking control, after the deceleration pulse is completed, to make the light beam position on the target track.

    摘要翻译： 在向信息介质执行写入操作和信息读取操作中的至少一个的装置中提供了用于使光束移动到目标轨道的轨道检索方法。 将跟踪控制应用于信息介质，以使光束位置在轨道上。 信息介质具有轨道，使得跟踪控制的极性在轨道之间交替地反转。 该方法包括以下步骤：在跟踪控制不可操作之后使光束向目标轨道移动; 并且检测光束和轨道之间的跟踪误差。 该方法还包括：产生对应于跟踪误差的跟踪误差信号; 基于通过对跟踪误差信号进行微分获得的微分信号的极性的变化，生成轨道中点信号，用于检测信息介质的相邻轨道之间的中点; 以及根据轨道中点信号产生减速光束的偏移的减速脉冲。 该方法还包括以下步骤：在减速脉冲完成之前反转跟踪控制的极性，并且在减速脉冲完成之后再次操作跟踪控制，以使目标轨道上的光束位置。

    Method for causing a light beam to jump from an initial track to a target track
    3.
    发明授权
    Method for causing a light beam to jump from an initial track to a target track 失效
    用于使光束从初始轨迹跳转到目标轨道的方法

    公开(公告)号：US5650984A

    公开(公告)日：1997-07-22

    申请号：US463041

    申请日：1995-06-05

    申请人： Hiroyuki Yamaguchi ,  Mitsurou Moriya ,  Toshiyuki Kinou ,  Shinichi Yamada

    发明人： Hiroyuki Yamaguchi ,  Mitsurou Moriya ,  Toshiyuki Kinou ,  Shinichi Yamada

    IPC分类号： G11B7/007 ,  G11B7/085 ,  G11B11/105 ,  G11B7/00

    CPC分类号： G11B7/08517 ,  G11B7/00718 ,  G11B7/08529 ,  G11B11/10563

    摘要： A method and apparatus for jumping from an initial track to a target track on a medium having tracks of alternating polarity uses a combination of two-track and one-track jumps to jump to the target track. Detection of the jump middle-point for a two-track jump includes detecting a zero crossing in a tracking error signal. Detection of the jump middle-point for a one-track jump includes detecting a zero-crossing in a differential signal generated according to the tracking error signal. A target track several tracks away may be reached using consecutive two-track jumps, and if necessary, a single one-track jump.

    摘要翻译： 在具有交替极性的轨道的介质上从初始轨迹跳跃到目标轨道的方法和装置使用双轨和单轨跳跃的组合来跳转到目标轨道。 用于双轨跳跃的跳跃中点的检测包括检测跟踪误差信号中的过零点。 用于单轨跳跃的跳跃中点的检测包括检测根据跟踪误差信号产生的差分信号中的过零点。 可以使用连续的双轨跳跃达到多个轨道的目标轨迹，如果需要，可以单个单轨跳跃。

    Focusing control apparatus using dynamic target value in relation to land/groove
    4.
    发明授权
    Focusing control apparatus using dynamic target value in relation to land/groove 失效
    使用相对于陆/沟的动态目标值对焦控制装置

    公开(公告)号：US5732051A

    公开(公告)日：1998-03-24

    申请号：US413489

    申请日：1995-03-30

    申请人： Hiroyuki Yamaguchi ,  Mitsuro Moriya ,  Osamu Yamaguchi ,  Shin-ichi Yamada ,  Toshiyuki Kinou ,  Yoshihiro Kanda

    发明人： Hiroyuki Yamaguchi ,  Mitsuro Moriya ,  Osamu Yamaguchi ,  Shin-ichi Yamada ,  Toshiyuki Kinou ,  Yoshihiro Kanda

    IPC分类号： G11B7/007 ,  G11B7/09 ,  G11B7/00

    CPC分类号： G11B7/00718 ,  G11B7/0908

    摘要： A focusing control apparatus is provided for controlling focusing of a light beam on a recording medium. The apparatus includes a control mechanism for maintaining the focusing state of the light beam on the recording medium by moving a focus mechanism based on a comparison between an output signal indicative of the focusing state and a target value. The apparatus further includes a target value setting circuit for setting the target value at a first level when the light beam is irradiated on the land track portions of the recording medium; and for setting the target value at a second level when the light beam is irradiated on the groove track portions.

    摘要翻译： 提供了一种聚焦控制装置，用于控制光束在记录介质上的聚焦。 该装置包括控制机构，用于通过基于指示聚焦状态的输出信号与目标值之间的比较来移动聚焦机构来保持光束在记录介质上的聚焦状态。 该装置还包括目标值设置电路，用于当光束照射在记录介质的脊迹部分上时，将目标值设置在第一水平; 并且当光束照射在凹槽轨道部分上时将目标值设置在第二水平。