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    • 1. 发明授权
    • Angular velocity detection device
    • 角速度检测装置
    • US08456179B2
    • 2013-06-04
    • US13129927
    • 2009-11-24
    • Hiroshi IwasawaToshiaki NakamuraMasahiro Matsumoto
    • Hiroshi IwasawaToshiaki NakamuraMasahiro Matsumoto
    • G01R27/26G01P3/44
    • G01C19/5776
    • The present invention aims to provide an angular velocity detection device which is capable of reducing the effect of coupling between a drive electrode and a first displacement detection electrode by a floating capacity, and is low in cost. In the angular velocity detection device, an oscillating body 21 is displaceable in a first direction and a second direction which orthogonally intersect each other. The oscillating body 21 is oscillated in the first direction by an electrostatic force corresponding to a drive signal generated by a non-interference signal generator 1. A carrier signal generated by the non-interference signal generator 1 is applied to the oscillating body 21. A first displacement detection circuit 3 and a second displacement detection circuit 4 each detect a displacement of the oscillating body 21 as a displacement modulation signal indicative of a change in electrostatic capacity synchronized with the carrier signal to thereby detect an angular velocity. Here, the frequency of the drive signal and the frequency of the carrier signal are set so as to be generated at such a frequency ratio that a higher harmonic of the drive signal multiplied by an odd number does not the displacement modulation signal.
    • 本发明的目的在于提供一种角速度检测装置,其能够通过浮动能力降低驱动电极与第一位移检测电极之间的耦合效果,成本低。 在角速度检测装置中,振动体21可以在彼此正交的第一方向和第二方向上移位。 振动体21通过与由无干扰信号发生器1产生的驱动信号相对应的静电力在第一方向上振荡。由非干扰信号发生器1产生的载波信号被施加到振荡体21.A 第一位移检测电路3和第二位移检测电路4各自检测振荡体21的位移,作为指示与载波信号同步的静电电容的变化的位移调制信号,从而检测角速度。 这里,驱动信号的频率和载波信号的频率被设定为以使得驱动信号乘以奇数的高次谐波不是位移调制信号的频率比来生成。
    • 3. 发明申请
    • Angular Velocity Detection Device
    • 角速度检测装置
    • US20110260740A1
    • 2011-10-27
    • US13129927
    • 2009-11-24
    • Hiroshi IwasawaToshiaki NakamuraMasahiro Matsumoto
    • Hiroshi IwasawaToshiaki NakamuraMasahiro Matsumoto
    • G01R27/26
    • G01C19/5776
    • The present invention aims to provide an angular velocity detection device which is capable of reducing the effect of coupling between a drive electrode and a first displacement detection electrode by a floating capacity, and is low in cost. In the angular velocity detection device, an oscillating body 21 is displaceable in a first direction and a second direction which orthogonally intersect each other. The oscillating body 21 is oscillated in the first direction by an electrostatic force corresponding to a drive signal generated by a non-interference signal generator 1. A carrier signal generated by the non-interference signal generator 1 is applied to the oscillating body 21. A first displacement detection circuit 3 and a second displacement detection circuit 4 each detect a displacement of the oscillating body 21 as a displacement modulation signal indicative of a change in electrostatic capacity synchronized with the carrier signal to thereby detect an angular velocity. Here, the frequency of the drive signal and the frequency of the carrier signal are set so as to be generated at such a frequency ratio that a higher harmonic of the drive signal multiplied by an odd number does not the displacement modulation signal.
    • 本发明的目的在于提供一种角速度检测装置,其能够通过浮动能力降低驱动电极与第一位移检测电极之间的耦合效果,成本低廉。 在角速度检测装置中,振动体21可以在彼此正交的第一方向和第二方向上移位。 振动体21通过与由无干扰信号发生器1产生的驱动信号相对应的静电力在第一方向上振荡。由非干扰信号发生器1产生的载波信号被施加到振荡体21.A 第一位移检测电路3和第二位移检测电路4各自检测振荡体21的位移,作为指示与载波信号同步的静电电容的变化的位移调制信号,从而检测角速度。 这里,驱动信号的频率和载波信号的频率被设定为以使得驱动信号乘以奇数的高次谐波不是位移调制信号的频率比来生成。
    • 6. 发明申请
    • MAGNETIC-FIELD-ANGLE MEASUREMENT DEVICE AND ROTATIONAL-ANGLE MEASUREMENT APPARATUS USING SAME
    • 使用相同的磁场角度测量装置和旋转角度测量装置
    • US20130063135A1
    • 2013-03-14
    • US13697690
    • 2010-05-14
    • Mutsumi SuzukiHiroshi IwasawaMasahiro Iwamura
    • Mutsumi SuzukiHiroshi IwasawaMasahiro Iwamura
    • G01B7/30G01R33/09
    • G01R33/098G11C7/06H01L43/08
    • In a magnetic-field angle detection device and a rotation angle detection device in which the accuracy of the measured angle is not degraded even if the MR ratio of the tunneling magnetoresistance element is increased. In a magnetic-field-angle measurement apparatus including a magnetic-field-angle detection circuit and a magnetic sensor having a tunneling magnetoresistance element with a pinned magnetic layer, the magnetic-field-angle detection circuit has a power-supply unit that outputs a constant voltage as a bias voltage to the tunneling magnetoresistance element of the magnetic sensor and a current-detection unit that detects an output current of the tunneling magnetoresistance element. The accuracy of the measured angle of the magnetic-field angle detection device and the rotation angle detection device is improved by measuring the tunneling magnetoresistance element current while maintaining the terminal voltage of the tunneling magnetoresistance element constant with input impedance of the current-detection unit as zero.
    • 在磁场角检测装置和旋转角度检测装置中,即使隧道磁阻元件的MR比增加,测量角度的精度也不会降低。 在包括磁场角检测电路的磁场角测量装置和具有钉扎磁性层的隧道磁阻元件的磁传感器中,磁场角检测电路具有电源单元,其输出 恒定电压作为磁传感器的隧道磁阻元件的偏置电压,以及电流检测单元,其检测隧道磁阻元件的输出电流。 通过测量隧道磁阻元件电流来改善磁场角检测装置和旋转角度检测装置的测量角度的精度,同时保持隧道磁阻元件的端电压恒定,电流检测单元的输入阻抗为 零。
    • 8. 发明授权
    • Ultrasonic diagnostic apparatus and pulse compression apparatus for use
therein
    • 超声波诊断装置及脉冲压缩装置
    • US4949312A
    • 1990-08-14
    • US339113
    • 1989-04-17
    • Hiroshi Iwasawa
    • Hiroshi Iwasawa
    • G01S15/89
    • G01S15/8959G01S15/895
    • An ultrasonic diagnostic apparatus for obtaining ultrasonic images of a body to be inspected by selectively using a plurality of ultrasonic vibrating elements having different frequency characteristics, including a chirp signal generating circuit for generating a chirp signal selected from a plurality of chirp signals each corresponding to respective ultrasonic vibrating elements, a plurality of pulse compression circuits each having a reference wave signal corresponding to respective chirp signals and compressing the echo signal by deriving a correlation of the echo signal with the selected reference signal, and a switching circuit for selecting one of the pulse compression circuits in accordance with the selected chirp signal corresponding to the ultrasonic vibrating element to be used.
    • 一种超声波诊断装置,用于通过选择性地使用具有不同频率特性的多个超声波振动元件来获取待检查的身体的超声波图像,所述超声波诊断装置包括线性调频脉冲信号发生电路,用于产生从多个相互对应的多个线性调频脉冲信号中选出的啁啾信号 超声波振动元件,多个脉冲压缩电路,每个脉冲压缩电路具有对应于各个啁啾信号的参考波信号,并通过导出回波信号与所选参考信号的相关性来压缩回波信号;以及切换电路,用于选择脉冲 压缩电路根据与所使用的超声波振动元件相对应的所选择的啁啾信号。