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    • 1. 发明授权
    • Method and apparatus for measuring off-track detection sensitivity
    • 用于测量离轨检测灵敏度的方法和装置
    • US07623419B2
    • 2009-11-24
    • US10768623
    • 2004-01-30
    • Yasuo Nakata
    • Yasuo Nakata
    • G11B7/085
    • G11B7/00375G11B7/002G11B7/08517G11B7/0946
    • An off-track duty measurement unit measures off-track detection sensitivity on the basis of an off-track signal, and track cross cycle information that is obtained from a tracking error signal measured by a track cross cycle measurement unit, whereby off-track detection sensitivity can be measured more accurately. Further, an off-track detection sensitivity controller changes the detection sensitivity of an off-track signal detector according to the obtained off-track detection sensitivity, whereby the off-track sensitivity can be kept constant for various kinds of discs, and accordingly, stabilities of off-track detection, track pull-in judgement, and track jumping can be secured.
    • 离轨占空比测量单元基于偏离轨道信号来测量偏离轨迹检测灵敏度,并且跟踪由轨道交叉循环测量单元测量的跟踪误差信号获得的交叉循环信息,由此进行离轨检测 灵敏度可以更准确地测量。 此外,偏离磁道检测灵敏度控制器根据获得的偏离磁道检测灵敏度改变偏离磁道信号检测器的检测灵敏度,从而可以使各种光盘的偏离磁道灵敏度保持不变,因此,稳定性 可以确保偏离轨迹检测,轨迹拉入判断和轨道跳跃。
    • 2. 发明授权
    • Optical disk device, semiconductor integrated circuit, pickup control method and vibration component detection method
    • 光盘装置,半导体集成电路,拾取控制方法和振动分量检测方法
    • US06934227B2
    • 2005-08-23
    • US10231160
    • 2002-08-30
    • Yasuo NakataMasanori Harui
    • Yasuo NakataMasanori Harui
    • G11B7/09G11B7/00
    • G11B7/0946G11B7/0908
    • To increase the vibration resistance of an optical disk device with respect to vibrations in the focus direction. More specifically, an optical disk device is provided with a multiplication means for generating a focus vibration component FC from the focus error signal FE, a multiplication means for generating a tracking vibration component TC from the tracking error signal TE, an adder for adding the focus vibration components FC and TC, and a low-pass filter for extracting the vibration component VC from the added results. Thus, the vibration component VC is extracted considering not only vibrations in the tracking direction but also vibrations in the focus direction, so that vibrations acting on the device can be more accurately detected, and vibration resistance is increased.
    • 相对于聚焦方向上的振动增加光盘装置的抗振性。 更具体地说,光盘装置设置有用于从聚焦误差信号FE产生聚焦振动分量FC的乘法装置,用于从跟踪误差信号TE产生跟踪振动分量TC的乘法装置,用于将焦点相加的加法器 振动分量FC和TC,以及用于从附加结果中提取振动分量VC的低通滤波器。 因此,不仅考虑跟踪方向上的振动,而且考虑聚焦方向的振动,提取振动分量VC,从而可以更精确地检测作用在装置上的振动,并且提高抗振性。
    • 3. 发明授权
    • Backhoe
    • 反铲
    • US06502896B1
    • 2003-01-07
    • US09653723
    • 2000-09-01
    • Yasuo NakataYoshitaka MatsubaraKenji IkedaKenzo KogaTeruo KunizawaTomoaki Miyake
    • Yasuo NakataYoshitaka MatsubaraKenji IkedaKenzo KogaTeruo KunizawaTomoaki Miyake
    • B60R2700
    • B60J5/0487E02F9/163Y10T16/531Y10T16/554Y10T16/557Y10T16/558Y10T16/5595
    • A backhoe (1) includes an upper structure (3) supported by a traveling device (2) to be rotatable about a vertical swivel axis (X). The upper structure (3) carries an excavator (4) and a cab (12) and has a rear edge (3A) formed arcuate about the swivel axis (X) in plan view. The cab (12) defines an opening (31) with a door (32) attached through hinges (34). The door (32) is pivotable about a vertical open/close axis (Y) of hinges (34). The hinges (34) are arranged on a rear edge opening (31). Each hinge (34) includes a pair of hinges (34A and 34B) which are bent to place the axis (Y) forwardly of the rear end of door (32). Consequently, when the door (32) is set to a fully open position, the free end of door (32) is displaced to a position forwardly of the rear edge (3A) of upper structure (3).
    • 反铲(1)包括由行走装置(2)支撑的上部结构(3),以可围绕垂直旋转轴线(X)旋转。 上部结构(3)承载挖掘机(4)和驾驶室(12),并且在俯视图中具有绕旋转轴线(X)弓形地形成的后边缘(3A)。 驾驶室(12)限定了具有通过铰链(34)连接的门(32)的开口(31)。 门(32)可围绕铰链(34)的垂直打开/关闭轴线(Y)枢转。 铰链(34)布置在后边缘开口(31)上。 每个铰链(34)包括一对铰链(34A和34B),其被弯曲以将轴线(Y)放置在门(32)的后端的前方。 因此,当门(32)设定为完全打开位置时,门(32)的自由端位移到上部结构(3)的后边缘(3A)的前方位置。
    • 5. 发明授权
    • Polarization detector
    • 极化探测器
    • US5473470A
    • 1995-12-05
    • US093920
    • 1993-07-21
    • Takahiro MiyakeYoshio YoshidaYasuo NakataYukio Kurata
    • Takahiro MiyakeYoshio YoshidaYasuo NakataYukio Kurata
    • G01J4/04G02B5/18G02B5/30G02B27/28G11B11/10G11B11/105G11B7/00
    • G01J4/04G02B27/283G02B5/1809G02B5/1814
    • A polarization detector includes a polarization diffraction element having a substrate with two facing surfaces which are placed in parallel with each other, a first diffraction grating formed on one surface of the substrate, and a second diffraction grating formed on the other surface of the substrate, with light being incident upon the first diffraction grating. Further, each grating pitch of the first diffraction grating and the second diffraction grating are nearly equal to a wavelength of the incident light. A limiting member is also included for limiting an incident region of the incident light with respect to the polarization diffraction element. The limiting member is formed on a light incident side of the first diffraction grating. Further, a converging lens is included for respectively converging light transmitted through the first diffraction grating and the second diffraction grating and light diffracted by the first diffraction grating and the second diffraction grating into different beam spots. Finally, a pair of photodetectors are included for detecting each optical intensity of the two beam spots converged by the converging lens.
    • 偏振检测器包括具有彼此平行放置的具有两个相对表面的基板的偏振衍射元件,形成在基板的一个表面上的第一衍射光栅和形成在基板的另一表面上的第二衍射光栅, 光入射到第一衍射光栅上。 此外,第一衍射光栅和第二衍射光栅的每个光栅间距几乎等于入射光的波长。 还包括限制入射光相对于偏振衍射元件的入射区域的限制构件。 限制部件形成在第一衍射光栅的光入射侧。 此外,包括会聚透镜,用于分别会聚透过第一衍射光栅和第二衍射光栅的光以及由第一衍射光栅和第二衍射光栅衍射的光成为不同的光束点。 最后,包括一对光检测器,用于检测由会聚透镜会聚的两束光束的每个光强度。