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    • 21. 发明授权
    • Automatic focusing device of a microscope
    • 自动对焦装置的显微镜
    • US4342905A
    • 1982-08-03
    • US180150
    • 1980-08-21
    • Norio FujiiAtsushi KawaharaMasahiro Sawada
    • Norio FujiiAtsushi KawaharaMasahiro Sawada
    • G02B21/24G01J1/20
    • G02B21/244
    • An automatic focusing device of a microscope having an objective lens and a stage on which a specimen is placed comprises distance varying means for varying the relative distance between the objective lens and the stage, distance detecting means for producing a distance output corresponding to said distance, photoelectric detector means for photoelectrically detecting a high frequency component of the space frequency component of the image of the specimen on the stage by the objective lens, judging means for judging whether or not a predetermined peak smaller than a maximum peak exists in the output of the photoelectric detector means within a predetermined distance range from a first distance output of the distance detecting means when the output of the photoelectric detector means assumes said maximum peak and for producing an in-focus output when said predetermined peak exists, and means for determining said relative distance on the basis of said in-focus output.
    • 具有物镜的显微镜的自动聚焦装置和放置有试样的台架包括用于改变物镜与台架之间的相对距离的距离变化装置,用于产生对应于所述距离的距离输出的距离检测装置, 光电检测装置,用于通过物镜光电检测载物台上的样本的空间频率分量的高频分量;判断装置,用于判断小于最大峰值的预定峰值是否存在于 光电检测装置,当光电检测装置的输出呈现所述最大峰值时,距距离检测装置的第一距离输出预定距离范围内,并且当存在所述预定峰值时产生对焦输出,以及用于确定所述相对 基于所述对焦输出的距离。
    • 24. 发明授权
    • Motor drive device
    • 电机驱动装置
    • US06710568B2
    • 2004-03-23
    • US10043310
    • 2002-01-14
    • Norio Fujii
    • Norio Fujii
    • G05B1128
    • H02P6/14Y02P80/116
    • A motor drive device of the invention has means for producing a pulse signal having a fixed amplitude by comparing a drive signal that is a sinusoidal signal synchronous with the rotation of a motor with a predetermined high-frequency signal, and the switching of a switching device connected between a power source and the motor is controlled by the pulse signal. This prevents the lowering of the switching speed of the switching device connected between the power source and the motor near the zero-cross points of the sinusoidal drive signal. This helps minimize switching loss and enhance power efficiency. Moreover, the phase current that flows through the motor comes to have a sinusoidal waveform. This helps enhance rotation characteristics.
    • 本发明的电动机驱动装置具有通过将与电机的旋转同步的正弦信号的驱动信号与预定的高频信号进行比较来产生具有固定振幅的脉冲信号的装置,以及开关装置的切换 电源和电机之间的连接由脉冲信号控制。 这防止在正弦驱动信号的零交叉点附近连接在电源和电动机之间的开关装置的开关速度降低。 这有助于最小化开关损耗并提高功率效率。 此外,流过电动机的相电流具有正弦波形。 这有助于增强旋转特性。
    • 25. 发明授权
    • Motor control circuit and motor drive system using the same
    • 电机控制电路和电机驱动系统采用相同的
    • US5298840A
    • 1994-03-29
    • US913376
    • 1992-07-15
    • Motoyasu YoshinoNorio Fujii
    • Motoyasu YoshinoNorio Fujii
    • H02P6/20G11B19/28H02P6/08H02P5/00
    • H02P6/08G11B19/28
    • A motor control circuit which controls the speed of a motor so as to settle at a predetermined reference rotational speed based upon a detection signal dependent upon the rotating speed of the motor, and outputs to external devices a ready signal representing that the rotating speed of the motor has stabilized within a predetermined allowable range with respect to the reference rotational speed, includes a window pulse generating circuit which generates a window pulse having a width dependent upon a range of the generating period of the detection pulse generated in correspondence with the rotating speed within the allowable range; and a detection circuit which compares the window pulse and a detection pulse generated from the detection signal, detects either the window pulse or the detection pulse when the period of the detection pulse falls within a range of the period represented by the window of the window pulse and outputs the ready signal when the detection continues consecutively a plurality of times.
    • 一种电动机控制电路,其基于取决于电动机的转速的检测信号来控制电动机的速度以便以预定的参考转速稳定,并且向外部装置输出表示所述电动机的转速的就绪信号 电机相对于基准旋转速度已经稳定在预定的允许范围内,包括窗口脉冲发生电路,其产生具有取决于根据内部的转速产生的检测脉冲的产生周期的范围的宽度的窗口脉冲 允许范围; 以及检测电路,其将窗口脉冲和从检测信号产生的检测脉冲进行比较,当检测脉冲的周期落在由窗口脉冲的窗口表示的周期的范围内时,检测窗口脉冲或检测脉冲 并且当检测持续多次时输出就绪信号。