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    • 3. 发明授权
    • Brushless motor and cooling fan
    • 无刷电机和散热风扇
    • US07589444B2
    • 2009-09-15
    • US12258668
    • 2008-10-27
    • Hiroyoshi TeshimaKoji MuraokaAkira Saiga
    • Hiroyoshi TeshimaKoji MuraokaAkira Saiga
    • H02K11/00
    • H02K29/08F04D25/064F04D25/0646
    • A rotor unit of a brushless motor includes a substantially cylindrical rotor magnet and a rotor holder arranged to retain an outer circumferential portion of the rotor magnet. A stator unit of the same includes a stator core around which coils are wound and a Hall IC for sensing magnetic flux generated from the rotor magnet. The stator core includes teeth disposed at positions separated in the circumferential direction, each of which has an arm portion extending outward in the radial direction around which the coil is wound, and a stretching portion extending from the arm portion outward in the radial direction and in the circumferential direction on both sides. A sensor element included in the Hall IC is positioned in the range within a lead angle of about four degrees or less as a mechanical angle in the circumferential direction from a line connecting radially the central axis and a point bisecting a line connecting neighboring stretching portions, and within a distance of about one millimeter or smaller outward in the radial direction from an arc connecting outer edges of the neighboring stretching portions.
    • 无刷电动机的转子单元包括基本上圆柱形的转子磁体和设置成保持转子磁体的外周部分的转子保持器。 其定子单元包括缠绕线圈的定子铁心和用于感测从转子磁体产生的磁通量的霍尔IC。 定子铁芯包括设置在圆周方向上分离的位置的齿,每个齿具有沿径向方向向外延伸的线圈缠绕的臂部分,以及从臂部沿径向向外延伸的拉伸部分, 两侧圆周方向。 包括在霍尔IC中的传感器元件位于距离中心轴线径向连接的线的圆周方向上的机械角度为大约四度以下的引导角的范围内,以及将相邻的拉伸部连接的线分成两点, 并且在距连接相邻拉伸​​部分的外边缘的弧的径向方向上在大约一毫米或更小的距离内。
    • 8. 发明授权
    • Optical disk apparatus
    • 光盘装置
    • US5210732A
    • 1993-05-11
    • US790842
    • 1991-11-12
    • Kiyoyuki SuenagaHiroyuki GondoMakoto TaromaruKoji MuraokaShingo Sagata
    • Kiyoyuki SuenagaHiroyuki GondoMakoto TaromaruKoji MuraokaShingo Sagata
    • G11B7/09
    • G11B7/094G11B7/0901G11B7/0941
    • An optical disk apparatus equipped with an objective lens for converging light from a light source onto a track formed on an optical disk, the objective lens being arranged to be movable and an error detecting section for detecting a difference in position between the light converged by the objective lens and the track on the optical disk. Included in the servo section of the optical disk apparatus are an amplifier for amplifying an output of the error detecting section with an amplification factor which is variable and a filter circuit for cutting off a frequency component of an output of the amplifying means, the cutoff frequency being variable. On the basis of the output of the filter circuit, a moving device moves the objective lens so that the difference between the converged light and said track is reduced. The amplification factor of the amplifier and the cutoff frequency of the filter circuit are determined in correspondence with the position of the objective lens. These amplification factor and cutoff frequency are prestored in a memory so that the corresponding amplification factor and cutoff frequency are read out therefrom in accordance with the current position of the objective lens.
    • 一种装备有用于将来自光源的光会聚到形成在光盘上的轨道上的物镜的光盘装置,所述物镜被布置为可移动的;以及误差检测部分,用于检测由所述光束收敛的光之间的位置差异 物镜和光盘上的轨道。 包括在光盘装置的伺服部分中的是放大器,用于以可变的放大系数放大误差检测部分的输出,以及用于截止放大装置的输出的频率分量的滤波电路,截止频率 是可变的 基于滤波器电路的输出,移动装置移动物镜,使得会聚光和所述轨道之间的差减小。 根据物镜的位置确定放大器的放大系数和滤波器电路的截止频率。 这些放大因子和截止频率预先存储在存储器中,使得根据物镜的当前位置从其读出相应的放大因子和截止频率。