公开(公告)号：US20050224146A1

公开(公告)日：2005-10-13

申请号：US11101426

申请日：2005-04-08

申请人： Koichi Tada ,  Kiichi Miyazaki

发明人： Koichi Tada ,  Kiichi Miyazaki

IPC分类号： B22D11/04 ,  B22D11/00 ,  B22D11/045 ,  B22D11/049 ,  B22D11/10 ,  B22D11/106 ,  B22D21/04 ,  C22F1/06

CPC分类号： B22D11/045 ,  B22D11/001 ,  B22D11/049

摘要： A molten Mg or Mg alloy is supplied into a mold, which is sheltered from the surroundings, from a pool in a tundish, which is shielded from the surroundings. An Mg slab or Mg alloy slab in the mold is drawn out to the outside from an outlet of the mold. A cooling medium is jetted onto the slab on an outer side of and in a vicinity of the outlet to cool the slab. A sealing gas is sprayed over an entire width of a free surface of the molten Mg or Mg alloy on an inner side of and in the vicinity of the outlet, to seal a portion above the entire width of the free surface of the molten Mg or Mg alloy, whereby preventing oxygen from flowing into the mold from the portion and preventing the cooling medium from running back to the mold side.

摘要翻译： 将熔融的Mg或Mg合金从与环境屏蔽的中间包中的池中供应到与周围环境保护的模具中。 模具中的Mg板或Mg合金板从模具的出口被抽出到外部。 将冷却介质喷射到出口外侧并在出口附近的板坯上以冷却板坯。 密封气体在熔融Mg或Mg合金的自由表面的整个宽度上喷射在出口的内侧和附近，以密封熔融Mg的自由表面的整个宽度以上的部分，或 Mg合金，从而防止氧从该部分流入模具并防止冷却介质回流到模具侧。

公开(公告)号：US6160783A

公开(公告)日：2000-12-12

申请号：US125788

申请日：1998-08-27

申请人： Yoichi Tsuchiya ,  Yasuyuki Kanou ,  Seiji Kajiyama ,  Koichi Tada

发明人： Yoichi Tsuchiya ,  Yasuyuki Kanou ,  Seiji Kajiyama ,  Koichi Tada

IPC分类号： G11B7/00 ,  G11B7/135

CPC分类号： G11B7/139 ,  G11B7/1369 ,  G11B2007/0006

摘要： An optical pick-up device includes an optical active element (11) which transmits an introduced laser beam (18) with its polarization direction (17) rotated by 90.degree. in playback of a DVD and also transmits an introduced laser beam (18) without rotating its polarization direction (17) in playback of a CD, and a polarizer (14) which transmits the entirety of a laser beam with its polarization direction rotated in playback of a DVD and also blocks the perimeter of a laser beam with its polarization direction not rotated in playback of a CD to reduce the effective numerical aperture of an objective lens (15). A rubbing direction (28) of an rubbing film (24) of the optical active element (11) that is positioned at the incident side of the laser beam, is adapted to be parallel to the polarization direction (17) of the introduced laser beam (18). Thus, the optical pick-up device can play back DVD as well as CD while reducing laser beam loss.

摘要翻译： PCT No.PCT / JP98 / 00022 Sec。 371日期1998年8月27日第 102（e）1998年8月27日PCT PCT 1998年1月7日PCT公布。 出版物WO98 / 48416 PCT 日期：1998年10月29日光拾取装置包括光学有源元件（11），其在DVD的回放中使其引导的激光束（18）的偏振方向（17）旋转90°，并且还传输引入的激光 光束（18），而不在CD的回放中旋转其偏振方向（17）;以及偏振器（14），其透射其整个激光束的偏振方向在DVD的重放中旋转，并且还阻挡激光的周边 光束的偏振方向在CD的回放中不旋转以减小物镜（15）的有效数值孔径。 位于激光束入射侧的光学有源元件（11）的摩擦膜（24）的摩擦方向（28）适于与引入的激光束的偏振方向（17）平行 （18）。 因此，光学拾取装置可以在减少激光束损耗的同时再现DVD以及CD。

公开(公告)号：US06522605B1

公开(公告)日：2003-02-18

申请号：US09650640

申请日：2000-08-30

申请人： Koichi Tada ,  Takashi Onaka

发明人： Koichi Tada ,  Takashi Onaka

IPC分类号： G11B700

CPC分类号： G11B7/0945 ,  G11B7/0053 ,  G11B7/094

摘要： A disk apparatus includes a DSP core. When turning on power to the apparatus main body or exchanging the MO disk, setting processing of focus offset (offset) values is performed. The DSP core extracts fine clock mark (FCM) signals out of the reproduced signal through tracking on the land/groove. Specifically, in a range that mean value of FCM signal levels is equal to or greater than a predetermined level, FCM signal levels are detected at positions shifted left and right by a predetermined amount from a present offset value. In this manner, scanning is made throughout the range while being shifted by a predetermined amount, each time of which a difference is detected. An offset value where the difference assumes a minimum is determined as an optimal offset value. The optimal offset values are determined respectively for the land and the groove, which are switched according to a track (land/groove) upon reproduction.

摘要翻译： 盘装置包括DSP核。 当打开设备主体的电源或更换MO盘时，执行聚焦偏移（偏移）值的设置处理。 DSP内核通过在接地/沟槽上进行跟踪，提取出再生信号中的精细时钟标记（FCM）信号。 具体地说，在FCM信号电平的平均值等于或大于预定电平的范围内，从当前偏移值向左右移动预定量的位置检测FCM信号电平。 以这种方式，在整个范围内进行扫描，同时移动预定量，每次检测到差异。 将差异假定为最小的偏移值确定为最佳偏移值。 分别对于在再现时根据轨道（平台/凹槽）切换的脊和槽分别确定最佳偏移值。

公开(公告)号：US6025866A

公开(公告)日：2000-02-15

申请号：US64032

申请日：1998-04-22

申请人： Yoichi Tsuchiya ,  Yasuyuki Kanou ,  Seiji Kajiyama ,  Koichi Tada ,  Katsutoshi Hibino ,  Shigeki Hori

发明人： Yoichi Tsuchiya ,  Yasuyuki Kanou ,  Seiji Kajiyama ,  Koichi Tada ,  Katsutoshi Hibino ,  Shigeki Hori

IPC分类号： G11B11/10 ,  G02B27/58 ,  G11B7/00 ,  G11B7/005 ,  G11B7/125 ,  G11B7/135 ,  G11B11/105 ,  B41J2/47

CPC分类号： B82Y10/00 ,  G02B27/58 ,  G11B11/10543 ,  G11B7/1365

摘要： An optical pickup apparatus including a polarization plane rotary unit arranged between a semiconductor laser and an objective lens, and a polarizing film arranged between the polarization plane rotary unit and the objective lens. The polarization plane rotary unit includes liquid crystal, two glass plates sandwiching the liquid crystal, and transparent electrodes patterned to a predetermined configuration on an inner face of these glass planes. The polarization plane rotary unit permits passage of the laser beam without rotating the plane of polarization of the entire laser beam at the time of recording, and permits passage of the laser beam with the plane of polarization of the center portion of the laser beam rotated and the plane of polarization of the remaining outer portion of the laser beam not rotated at the time of reproduction. Only the outer portion of the laser beam is focused on a magneto-optical disk in a reproduction mode, so that a main beam of a small spot is formed by mutual interference. Since the plane of polarization of the laser beam directed on the magneto-optical disk is not rotated, the Kerr angle of rotation can be detected at high accuracy. As a result, the reproducibility is improved.

摘要翻译： 一种包括设置在半导体激光器和物镜之间的偏振面旋转单元的光拾取装置，以及配置在偏振面旋转单元与物镜之间的偏振膜。 偏振面旋转单元包括液晶，夹着液晶的两个玻璃板以及在这些玻璃平面的内表面上被图案化成预定构造的透明电极。 在记录时，偏振面旋转单元允许激光束的通过而不旋转整个激光束的偏振平面，并且允许激光束与激光束的中心部分的偏振平面一起旋转，并且 在再现时激光束的剩余外部部分的偏振面不转动。 只有激光束的外部部分在再现模式下聚焦在磁光盘上，使得通过相互干扰形成小光斑的主光束。 由于朝向磁光盘的激光束的偏振面不旋转，因此可以高精度地检测克尔角的旋转角度。 结果，再现性提高。

公开(公告)号：US5175861A

公开(公告)日：1992-12-29

申请号：US812853

申请日：1991-12-23

申请人： Tadashi Hara ,  Koichi Tada

发明人： Tadashi Hara ,  Koichi Tada

IPC分类号： G06F9/46

CPC分类号： G06F9/52

摘要： A lock processing system which judges locking requests from a plurality of processors. The lock processing system contains two system control units. Locking or unlocking information is transferred between the two system control units. The lock processing system stores the information transferred between the two system control units and judges whether there is a conflict for locking or unlocking. The lock processing system dispenses with hardware otherwise needed for transferring between system control units.

摘要翻译： 一种锁定处理系统，其判断来自多个处理器的锁定请求。 锁处理系统包含两个系统控制单元。 在两个系统控制单元之间传送锁定或解锁信息。 锁处理系统存储在两个系统控制单元之间传送的信息，并判断是否存在用于锁定或解锁的冲突。 锁处理系统不需要在系统控制单元之间转移的硬件。

公开(公告)号：US06891787B1

公开(公告)日：2005-05-10

申请号：US09642886

申请日：2000-08-22

申请人： Koichi Tada

发明人： Koichi Tada

IPC分类号： G11B7/0037 ,  G11B7/005 ,  G11B7/007 ,  G11B7/09 ,  G11B11/105 ,  G11B20/10 ,  G11B20/18 ,  G11B27/36 ,  G11B7/00

CPC分类号： G11B20/10203 ,  G11B7/00375 ,  G11B7/0053 ,  G11B7/00718 ,  G11B7/0945 ,  G11B7/0948 ,  G11B11/10576 ,  G11B11/10595 ,  G11B20/18 ,  G11B27/36 ,  G11B2220/20 ,  G11B2220/2525

摘要： A defect detecting circuit generates a defect detection signal when the level of a sum signal obtained from an optical sensor in an optical pickup is lower than a predetermined level, and a gate circuit responds to the defect detection signal to set the level of a fine clock mark signal to zero, that is a difference signal obtained from the optical sensor in the optical pickup. A fine clock mark is thus distinguished from any defect such as scratch and a correct fine clock mark signal is accordingly generated. Alternatively, the value of a sum signal, which indicates the total amount of reflected light output from the optical pickup, is compared with a predetermined threshold. When the period in which the value of the sum signal is smaller than the threshold lasts for a predetermined threshold time period, it is determined that focus of an objective lens deviates from an optical disk and accordingly focus servo control is stopped. The threshold is defined by gradually reducing a drive signal while detecting peak and bottom values of the sum signal which is generated as the objective lens is moved in the direction of its optical axis, and then setting the threshold between the detected peak and bottom values. In this way, defocus of the objective lens is surely detected.

摘要翻译： 当从光学拾取器中的光学传感器获得的和信号的电平低于预定电平时，缺陷检测电路产生缺陷检测信号，并且门电路响应缺陷检测信号以设置精细时钟的电平 将信号标记为零，即从光学拾取器中的光学传感器获得的差分信号。 因此，精确的时钟标记与任何诸如划痕的缺陷区分开，并且相应地产生正确的精细时钟标记信号。 或者，将表示从光学拾取器输出的反射光的总量的和信号的值与预定阈值进行比较。 当和信号的值小于阈值的周期持续预定的阈值时间段时，确定物镜的焦点偏离光盘，从而停止聚焦伺服控制。 通过逐渐减小驱动信号来定义阈值，同时检测当物镜沿着其光轴的方向移动时产生的和信号的峰值和底值，然后在检测到的峰值和底部值之间设置阈值。 以这种方式，确实地检测到物镜的散焦。

公开(公告)号：US06529455B1

公开(公告)日：2003-03-04

申请号：US09642935

申请日：2000-08-22

申请人： Tadashi Okajima ,  Toshihide Hamaguchi ,  Koichi Tada

发明人： Tadashi Okajima ,  Toshihide Hamaguchi ,  Koichi Tada

IPC分类号： G11B700

CPC分类号： G11B11/10556 ,  G11B7/0908 ,  G11B7/0945 ,  G11B7/0956

摘要： A disk apparatus includes a DSP core, and executes processing for focal point positioning when turning on the power to the apparatus main body or exchanging the MO disk. The DSP core detects maximum and minimum values of outputs (focus error signal) of an FE signal detector circuit while moving the objective lens from an uppermost position of not contacted with a disk surface to a lowermost position. The DSP core calculates a middle position using positions of the objective lens upon fetching maximum and minimum values (uppermost and lowermost positions). Subsequently, the DSP core determines a range narrower than a range to be determined by the uppermost and lowermost positions, by the use of the middle point and amount of surface deflection of the MO disk. Then, the DSP core wobbles the objective lens within the narrow range and detects a focal point based on a level of the focus error signal.

摘要翻译： 磁盘装置包括DSP内核，并且当接通设备主体的电源或更换MO盘时，执行用于焦点定位的处理。 DSP内核检测FE信号检测器电路的最大值和最小值，同时将物镜从不与盘表面接触的最上位置移动到最低位置。 DSP内核在获取最大值和最小值（最高和最低位置）时，使用物镜的位置来计算中间位置。 随后，DSP核心通过使用中间点和MO盘的表面偏转量来确定比由最上位置和最下位置确定的范围窄的范围。 然后，DSP内核在窄范围内摆动物镜，并根据聚焦误差信号的电平检测焦点。