公开(公告)号：US06992956B2

公开(公告)日：2006-01-31

申请号：US10275961

申请日：2001-04-23

申请人： Shigekazu Minechika ,  Koichi Tada ,  Junko Onaka

发明人： Takashi Onaka

IPC分类号： G11B7/005

CPC分类号： G11B20/10009 ,  G11B7/0053 ,  G11B7/00718 ,  G11B7/0901 ,  G11B7/24082 ,  G11B11/10515 ,  G11B27/19 ,  G11B27/3027

摘要： A disk reproducing apparatus includes a variable gain amplifier (VCA) (32), and the VCA applies a radial push-pull signal including an address signal and an FCM leakage-in signal to a switch (38). The switch outputs only the address signal to a peak-hold circuit (40) on the basis of an FCM mask signal from a mask signal generation circuit (36). The peak-hold circuit generates a peak-hold signal of the address signal so as to be output to a DSP (30), and the DSP controls a gain of the VCA on the basis of the peak-hold signal. Then, the radial push-pull signal in which the gain is controlled on the basis of the address signal is applied to an address detection circuit (42), and the address signal is detected therein.

摘要翻译： 盘再现装置包括可变增益放大器（VCA）（32），并且VCA将包括地址信号和FCM泄漏信号的径向推挽信号施加到开关（38）。 根据来自掩模信号发生电路（36）的FCM屏蔽信号，开关仅将地址信号输出到峰值保持电路（40）。 峰值保持电路产生地址信号的峰值保持信号，以便输出到DSP（30），DSP根据峰值保持信号控制VCA的增益。 然后，将基于地址信号控制增益的径向推挽信号施加到地址检测电路（42），并在其中检测地址信号。

公开(公告)号：US20050152247A1

公开(公告)日：2005-07-14

申请号：US10501331

申请日：2003-01-17

申请人： Shigekazu Minechika ,  Tadashi Okajima ,  Takanobu Hisamitsu

发明人： Shigekazu Minechika ,  Tadashi Okajima ,  Takanobu Hisamitsu

IPC分类号： G11B7/1263 ,  G11B7/005 ,  G11B19/28 ,  G11B5/09

CPC分类号： G11B7/1267 ,  G11B7/005 ,  G11B11/10515 ,  G11B11/10595

摘要： A disk apparatus includes a DSP (Digital Signal Processor), and the DSP performs a test writing and a test reading on a magneto-optical disk rotated in a ZCLV system to obtain an optimal reproduction laser power value (reference reproduction laser power value) “Pt” at a linear velocity of 30 Mbps in the ZCLV system. Next, by use of a relational expression between a power coefficient and a linear velocity, a linear velocity coefficient “αx” as an optimal reproduction laser power value at a desired linear velocity (zone) “Vx” in a ZCAV system is obtained when the reference reproduction laser power value is multiplied. Then, the optimal reproduction laser power value at the zone in the ZCAV system is obtained by multiplying the reference reproduction laser power value “Pt” by the linear velocity coefficient “αx”.

摘要翻译： 磁盘装置包括DSP（数字信号处理器），并且DSP在以ZCLV系统旋转的磁光盘上执行测试写入和测试读取以获得最佳再现激光功率值（参考再现激光功率值）“ Pt“在ZCLV系统中的线速度为30Mbps。 接下来，通过使用功率系数和线速度之间的关系表达式，在ZCAV系统中在期望的线速度（区域）“Vx”处的线速度系数“alphax”作为最佳再现激光功率值获得，当 参考再生激光功率值相乘。 然后，通过将参考再现激光功率值“Pt”乘以线速度系数“alphax”来获得ZCAV系统中的区域处的最佳再现激光功率值。

公开(公告)号：US20050088930A1

公开(公告)日：2005-04-28

申请号：US10250680

申请日：2002-01-09

申请人： Shigekazu Minechika ,  Hideaki Yano ,  Keiji Nagata ,  Yoshihiro Aoi ,  Ichizo Sakamoto ,  Kenji Asano ,  Tadashi Okajima

发明人： Shigekazu Minechika ,  Hideaki Yano ,  Keiji Nagata ,  Yoshihiro Aoi ,  Ichizo Sakamoto ,  Kenji Asano ,  Tadashi Okajima

IPC分类号： G11B7/005 ,  G11B7/00 ,  G11B7/09 ,  G11B7/125 ,  G11B11/105

CPC分类号： G11B7/126 ,  G11B7/00 ,  G11B7/0908 ,  G11B7/0945 ,  G11B11/10595

摘要： A disc apparatus (10) includes an optical lens (14). A laser beam is irradiated onto a recording surface of the magneto-optical disc (68) through the optical lens (14), and a TE signal or an RF signal is detected on the basis of the laser beam reflected by the recording surface. Herein, an MPU (50) replaces the optical lens (14) in an optical axis direction, and a TE signal detection circuit (42) or an RF signal detection circuit (60) detects the TE signal or the RF signal at each of lens positions. A laser power is adjusted by the MPU (50) such that amplitude of each of the TE signal or the RF signal detected is below a saturation value. When a parameter is adjusted, a position of the optical lens (14) is controlled such that the amplitude of the TE signal or the RF signal detected thereafter is maximized.

摘要翻译： 盘装置（10）包括光学透镜（14）。 激光束通过光学透镜（14）照射在磁光盘（68）的记录表面上，并且基于由记录表面反射的激光束来检测TE信号或RF信号。 这里，MPU（50）在光轴方向上替换光学透镜（14），TE信号检测电路（42）或RF信号检测电路（60）检测每个透镜上的TE信号或RF信号 职位 通过MPU（50）调整激光功率，使得检测到的每个TE信号或RF信号的振幅低于饱和值。 当调整参数时，控制光学透镜（14）的位置，使得TE信号或其后检测到的RF信号的振幅最大化。

公开(公告)号：US06426923B1

公开(公告)日：2002-07-30

申请号：US09926142

申请日：2001-09-10

申请人： Shigekazu Minechika

发明人： Shigekazu Minechika

IPC分类号： G11B1100

CPC分类号： G11B5/09 ,  G11B5/012 ,  G11B5/02 ,  G11B11/10508 ,  G11B2005/0013 ,  H03K17/6872

摘要： A magnetic head drive circuit comprises a control circuit for receiving a recording signal for recording data on a recording medium with use of magnetism and producing a control signal based on the recording signal, and a switch circuit comprising switching FETs for changing the direction of current to be passed through a field coil of a magnetic head based on the control signal received from the control circuit. Pch FETs and Nch FETs are both used as the switching FETs. The maximum value of the gate voltage of the switching FETs is lower than the voltage Vd of a coil power source for supplying the current to be passed through the field coil and higher than the gate threshold voltage of the switching FETs.

摘要翻译： 一种磁头驱动电路，包括：控制电路，用于接收用于使用磁记录在记录介质上的数据的记录信号，并产生基于该记录信号的控制信号;以及开关电路，包括切换用于改变电流方向的FET 基于从控制电路接收的控制信号，通过磁头的励磁线圈。 Pch FET和Nch FET都用作开关FET。 开关FET的栅极电压的最大值低于用于提供要通过励磁线圈的电流的线圈电源的电压Vd，并且高于开关FET的栅极阈值电压。

公开(公告)号：US4993011A

公开(公告)日：1991-02-12

申请号：US425503

申请日：1989-10-20

申请人： Kenji Torazawa ,  Satoshi Sumi ,  Seiji Murata ,  Shigekazu Minechika

发明人： Kenji Torazawa ,  Satoshi Sumi ,  Seiji Murata ,  Shigekazu Minechika

IPC分类号： G11B7/00 ,  G11B7/0045 ,  G11B7/08 ,  G11B7/09 ,  G11B7/125 ,  G11B7/13 ,  G11B11/105

CPC分类号： G11B11/10597 ,  G11B11/10519 ,  G11B11/10532 ,  G11B11/10576 ,  G11B7/0045 ,  G11B7/08 ,  G11B7/125 ,  G11B7/131 ,  G11B7/0901 ,  G11B7/0903 ,  G11B7/0909

摘要： An erasing beam B1 and a recording beam B2 emitted from a laser diode array 20 are focused on different tracks of a optical magnetic disk D, the erasing beam B1 being focused on a track located ahead of a track on which the recording beam B2 is focused. The reflected beams of the erasing beam B1 and the recording beam B2 are separated respectively into two polarized components by means of a polarized beam splitter 17 and the polarized components are received by photo sensor means 23 and 24. Based on outputs of the photo sensor means 23 and 24, an address signal, a focus error signal and a tracking error signal are obtained. At the time of reproduction, the laser diode array 20 emits a reproducing beam so that the photo sensor means provide a reproducing signal.

摘要翻译： 从激光二极管阵列20发射的擦除光束B1和记录光束B2聚焦在光盘D的不同轨道上，擦除光束B1被聚焦在位于记录光束B2聚焦的光道前方的光道上 。 擦除光束B1和记录光束B2的反射光束通过偏振光束分离器17分别分离成两个偏振分量，并且偏振分量被光传感器装置23和24接收。基于光传感器装置 23和24，获得地址信号，聚焦误差信号和跟踪误差信号。 在再现时，激光二极管阵列20发射再现光束，使得光传感器装置提供再现信号。