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    • 42. 发明授权
    • Method for making a double-walled yoke
    • 制造双壁轭的方法
    • US07716809B2
    • 2010-05-18
    • US11504345
    • 2006-08-15
    • Takahiro MiuraMasayuki Yoshizawa
    • Takahiro MiuraMasayuki Yoshizawa
    • H02K15/00
    • H02K15/03H02K1/17Y10T29/49009Y10T29/49012Y10T29/49805
    • Provided is a method for making a double-walled yoke that allows an inner yoke (4) and outer yoke (3) to be integrally joined to each other both easily and securely. Such a yoke provides an adequate cross sectional area for a magnetic path of the yoke while minimizing the weight of the yoke. A tubular member (14) destined to be form the inner yoke and a cup-shaped member (13) destined to form the outer yoke are both fitted on a punch (7) and a drawing process is executed by using an appropriate drawing die (8). The outer yoke may have a small wall thickness as long as it is capable of retaining its shape during use or supporting a bearing for the motor. The inner yoke is required to be relatively small in size as long it is capable of forming a satisfactory magnetic path for the motor. A satisfactory magnetic path can be obtained if the yoke is provided with an adequate wall thickness so as to provide an adequate cross sectional area for the magnetic path.
    • 本发明提供了一种制造双层磁轭的方法,其允许内磁轭(4)和外磁轭(3)彼此一体地结合在一起容易且牢固。 这种磁轭为磁轭的磁路提供了足够的横截面积,同时最小化磁轭的重量。 用于形成内轭的管状构件(14)和用于形成外轭的杯形构件(13)都装配在冲头(7)上,并且通过使用适当的拉拔模具( 8)。 外轭铁可以具有小的壁厚,只要其能够在使用期间保持其形状或支撑用于电动机的轴承。 只要能够为马达形成令人满意的磁路,内磁轭的尺寸要求相对较小。 如果磁轭具有足够的壁厚以便为磁路提供足够的横截面积,则可以获得令人满意的磁路。
    • 47. 发明授权
    • Optical pickup, optical drive apparatus, and light illumination method
    • 光学拾取器,光学驱动装置和光照射方法
    • US08369201B2
    • 2013-02-05
    • US13053566
    • 2011-03-22
    • Kimihiro SaitoNorihiro TanabeHirotaka MiyamotoTakahiro Miura
    • Kimihiro SaitoNorihiro TanabeHirotaka MiyamotoTakahiro Miura
    • G11B7/00
    • G11B7/0908G11B7/00781G11B7/0938G11B7/1376G11B2007/0013
    • There is provided an optical pickup including: an optical-system having an object-lens illuminating a first light for information recording or reproducing on a recording layer as a target and a second light on an optical-recording medium including a reference plane having a reflection-layer and the recording-layer at a layer position different from that of the reference-plane and on which information recording is performed through mark formation, and a focus-aligned-position-adjusting unit adjusting a focus-aligned position of the first light through the object-lens by changing collimation thereof incident to the object-lens; and a focusing-mechanism driving the object-lens in a focusing direction, wherein, when a depth of focus λ/NA2 defined by a wavelength λ of the first light and a numerical aperture NA of the object lens is set to α and the maximum-surface-blur range is denoted by D, the optical-system is designed so that a use magnification ratio β satisfies |β|≧√(D/α).
    • 提供了一种光学拾取器,包括:光学系统,其具有在作为目标的记录层上照射用于信息记录或再现的第一光的物镜,以及在包括具有反射的参考平面的光记录介质上的第二光 层和位于不同于参考平面的层位置处的记录层,并且通过标记形成执行信息记录;以及聚焦对准位置调整单元,调整第一光的聚焦对准位置 通过改变入射到物镜的准直通过物镜; 以及在聚焦方向上驱动物镜的聚焦机构,其中,当由所述第一光的波长λ和所述物镜的数值孔径NA定义的焦深λ/ NA2被设定为α并且最大值 表面模糊范围由D表示,光学系统设计成使用放大率&bgr; 满足|&bgr | |≧√(D /α)。
    • 48. 发明申请
    • REPRODUCING DEVICE AND OPTICAL PATH LENGTH SERVO CONTROL METHOD
    • 再生设备和光路长度伺服控制方法
    • US20120069722A1
    • 2012-03-22
    • US13233269
    • 2011-09-15
    • Takahiro MiuraYojiro Sumi
    • Takahiro MiuraYojiro Sumi
    • G11B7/00
    • G11B7/1362G11B7/00452G11B7/0908G11B7/0938G11B7/13G11B7/1359G11B7/1365G11B7/1378G11B2007/0009
    • A reproducing device includes a homodyne detection part that carries out homodyne detection by using reflected light of first light obtained from a recording layer as signal light and using reflected light of second light by a mirror as reference light, a signal reproducing part that obtains a reproduced signal based on the signal light, based on a result of homodyne detection, and a one-axis actuator that drives the mirror. The reproducing device further includes an optical path length servo control part that carries out driving control of the one-axis actuator in such a manner that the optical path length difference between the signal light and the reference light is kept constant, and an offset giving part that gives an offset that reduces or enlarges the amplitude difference of the reproduced signal of marks that are recorded in the recording layer and have sizes different from each other.
    • 一种再现装置,包括:通过使用从记录层获得的第一光的反射光作为信号光并使用由反射镜作为参考光的第二光的反射光进行零差检测的零差检测部,获得再现的信号再现部 基于信号光的信号,基于零差检测的结果,以及驱动反射镜的单轴致动器。 再现装置还包括光路长度伺服控制部分,其以使得信号光和参考光之间的光程长度差保持恒定的方式执行单轴致动器的驱动控制,以及偏移给定部分 其给出了减小或放大记录在记录层中的标记的再现信号的幅度差并具有彼此不同的尺寸的偏移。
    • 49. 发明申请
    • OPTICAL PICKUP, OPTICAL DRIVE APPARATUS, AND LIGHT ILLUMINATION METHOD
    • 光学拾取,光学驱动装置和光照射方法
    • US20110242951A1
    • 2011-10-06
    • US13053566
    • 2011-03-22
    • Kimihiro SaitoNorihiro TanabeHirotaka MiyamotoTakahiro Miura
    • Kimihiro SaitoNorihiro TanabeHirotaka MiyamotoTakahiro Miura
    • G11B7/135
    • G11B7/0908G11B7/00781G11B7/0938G11B7/1376G11B2007/0013
    • There is provided an optical pickup including: an optical-system having an object-lens illuminating a first light for information recording or reproducing on a recording layer as a target and a second light on an optical-recording medium including a reference plane having a reflection-layer and the recording-layer at a layer position different from that of the reference-plane and on which information recording is performed through mark formation, and a focus-aligned-position-adjusting unit adjusting a focus-aligned position of the first light through the object-lens by changing collimation thereof incident to the object-lens; and a focusing-mechanism driving the object-lens in a focusing direction, wherein, when a depth of focus λ/NA2 defined by a wavelength λ of the first light and a numerical aperture NA of the object lens is set to α and the maximum-surface-blur range is denoted by D, the optical-system is designed so that a use magnification ratio β satisfies |β|≧√(D/α).
    • 提供了一种光学拾取器,包括:光学系统,其具有在作为目标的记录层上照射用于信息记录或再现的第一光的物镜,以及在包括具有反射的参考平面的光记录介质上的第二光 层和位于不同于参考平面的层位置处的记录层,并且通过标记形成执行信息记录;以及聚焦对准位置调整单元,调整第一光的聚焦对准位置 通过改变入射到物镜的准直通过物镜; 以及在聚焦方向上驱动物镜的聚焦机构,其中,当由所述第一光的波长λ和所述物镜的数值孔径NA定义的焦深λ/ NA2被设定为α并且最大值 表面模糊范围由D表示,光学系统设计成使用放大率&bgr; 满足|&bgr | |≧√(D /α)。