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31. 发明授权

US06678109B2 Disk drive, servo control unit, and control unit 有权
标题翻译：磁盘驱动器，伺服控制单元和控制单元
公开(公告)号：US06678109B2
公开(公告)日：2004-01-13
申请号：US09133464
申请日：1998-08-13
申请人： Naoyuki Kagami , Masayuki Murakami , Yuzo Nakagawa , Tatsuya Sakai
发明人： Naoyuki Kagami , Masayuki Murakami , Yuzo Nakagawa , Tatsuya Sakai
IPC分类号： G11B5596
CPC分类号： G11B5/59611
摘要： A disk drive, a servo controller, and a controller which have realized high-degree control by lightening processing load to a microprocessor unit (MPU) without increasing cost is disclosed. An analog/digital (AD) converter (ADC) performs the AD conversions of the regenerated levels A, B, C, and D of burst patterns supplied from a channel and retains the converted levels in an ADC register. A servo assist (SA) computes parameters, such as the position error of a head, independently of an MPU, based on the regenerated levels of the burst patterns retained in the ADC register and an instruction from the MPU retained in a SRAM. Based on the computed parameters, the SA computes servo data (DACOUT) for driving a voice coil motor and supplies the servo data to the DAC section of a VCM driver section through a SIO.
摘要翻译：公开了一种磁盘驱动器，伺服控制器和控制器，其通过将处理负载减轻到微处理器单元（MPU）而不增加成本而实现了高度的控制。模拟/数字（AD）转换器（ADC）执行从通道提供的脉冲串模式的再生电平A，B，C和D的AD转换，并将转换后的电平保持在ADC寄存器中。伺服辅助（SA）基于保留在ADC寄存器中的脉冲串模式的再生电平和来自保留在SRAM中的MPU的指令，而独立于MPU来计算头部的位置误差等参数。基于计算出的参数，SA计算用于驱动音圈电机的伺服数据（DACOUT），并通过SIO将伺服数据提供给VCM驱动器部分的DAC部分。

32. 发明授权

US06377418B1 Digital filter, servo control unit, and disk drive 有权
标题翻译：数字滤波器，伺服控制单元和磁盘驱动器
公开(公告)号：US06377418B1
公开(公告)日：2002-04-23
申请号：US09148846
申请日：1998-09-03
申请人： Naoyuki Kagami , Akira Tokizono , Hien Dang , Arun Sharma , Sri M. Sri-Jayantha
发明人： Naoyuki Kagami , Akira Tokizono , Hien Dang , Arun Sharma , Sri M. Sri-Jayantha
IPC分类号： G11B5596
CPC分类号： H03H17/04 , G11B5/59622 , G11B21/085 , H03H17/0294
摘要： The present invention provides a digital filter which is capable of preventing filter outputs from being discontinuous when a filter characteristic is changed. Initially, a servo assistant (SA) computes parameters for computing servo data, and based on the computed parameters, the SA judges an operating mode. If the mode has been changed, the SA will advance in processing. Next, the parameters of a filter are changed in correspondence with the judged operating mode, and the initial values of the interior variables of the filter are set to appropriate values.
摘要翻译：本发明提供一种数字滤波器，当滤波器特性改变时，能够防止滤波器输出不连续。最初，伺服助理（SA）计算用于计算伺服数据的参数，并且基于所计算的参数，SA判断操作模式。如果模式发生变化，SA将进行处理。接下来，根据判断的操作模式改变滤波器的参数，并将滤波器的内部变量的初始值设置为适当的值。

33. 发明授权

US06351343B1 Arrangement structure of the printed circuit board and the interface cable connector of a magnetic disk drive 失效
标题翻译：印刷电路板的布置结构和磁盘驱动器的接口电缆连接器
公开(公告)号：US06351343B1
公开(公告)日：2002-02-26
申请号：US08798443
申请日：1997-02-10
申请人： Yuzo Nakagawa , Kiyoshi Satoh , Hiroki Kitahori , Naoyuki Kagami
发明人： Yuzo Nakagawa , Kiyoshi Satoh , Hiroki Kitahori , Naoyuki Kagami
IPC分类号： G11B3312
CPC分类号： G11B25/043 , G11B33/122
摘要： An arrangement structure of the printed circuit board and the interface cable connector of a magnetic disk drive for increasing the degree of freedom of the arrangement of a spindle motor, and for minimizing the size of a printed circuit board. An interface cable connector is disposed on the side opposite to the spindle motor, and the printed circuit board is sized so as not to contact with the spindle motor in the height direction. This allows the degree of freedom of the arrangement of the spindle motor to increase. Further, the distance between the interface cable connector and the preamplifier connector on the printed circuit board is short. Thus, the size of the printed circuit board can be made as small as possible.
摘要翻译：印刷电路板和磁盘驱动器的接口电缆连接器的布置结构，用于增加主轴电动机布置的自由度，并使印刷电路板的尺寸最小化。接口电缆连接器设置在与主轴电动机相对的一侧，并且印刷电路板的尺寸设计成不在高度方向上与主轴电动机接触。这允许主轴电动机的布置的自由度增加。此外，接口电缆连接器和印刷电路板上的前置放大器连接器之间的距离很短。因此，可以使印刷电路板的尺寸尽可能小。

34. 发明授权

US5459309A Focus acquiring method and optical disk drive 失效
标题翻译：聚焦获取方法和光盘驱动器
公开(公告)号：US5459309A
公开(公告)日：1995-10-17
申请号：US138028
申请日：1993-10-19
申请人： Naoyuki Kagami , Makoto Takekoshi
发明人： Naoyuki Kagami , Makoto Takekoshi
IPC分类号： G11B7/085 , G11B7/09 , G11B7/00
CPC分类号： G11B7/0945 , G11B7/0908
摘要： The present invention ensures successful focus acquisition in an optical disk drive independent of a travelling speed of an objective lens at the time when a focus servo circuit loop is closed. The present invention provides sending a signal to a focus actuator for bringing an objective lens close to an in-focus position while a focus servo circuit loop is opened; closing the loop by shutting off the signal sent to the focus actuator; adding an offset of a predetermined level to the focus error signal; detecting that the focus error signal to which the offset is added reaches a predetermined level; and closing the loop when it is detected that the predetermined level is reached, and gradually decreasing the value of the offset to be added to the focus error signal.
摘要翻译：本发明确保在聚焦伺服电路回路关闭时独立于物镜的移动速度的光盘驱动器中的成功的聚焦获取。本发明在聚焦伺服电路回路打开的同时，向聚焦致动器发送信号，使物镜接近对焦位置; 通过关闭发送到聚焦致动器的信号来闭合回路; 向所述聚焦误差信号添加预定电平的偏移; 检测添加了偏移的聚焦误差信号达到预定水平; 并且当检测到达到预定电平时闭合环路，并逐渐减小要添加到聚焦误差信号的偏移值。

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