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    • 1. 发明授权
    • Ultrasonic rangefinder
    • 超声波测距仪
    • US5812495A
    • 1998-09-22
    • US668411
    • 1996-06-21
    • Muneharu YamashitaJun TabotaYasuharu Matsui
    • Muneharu YamashitaJun TabotaYasuharu Matsui
    • G01S7/521G01S7/527G01S7/529G01S15/10G01S15/00G01N29/00
    • G01S7/521G01S7/527G01S7/529
    • An ultrasonic rangefinder capable of effectively removing high-level, directly transmitted wave components. The rangefinder can be used even at low temperatures. The rangefinder comprises an input signal-processing circuit, an output signal-processing circuit, and a gain control circuit inserted between the input and output signal-processing circuits. The output signal-processing circuit includes a reception amplification circuit and a detection circuit, the reception amplification circuit having an amplifier. The gain control circuit lowers the gain of the reception amplification circuit to raise the undetected and detected input voltage levels applied to the detection circuit. The gain control circuit comprises three control devices. The first control device is driven into conduction when its input pulse signal varies from a low level to a high level. The second control device reduces the feedback resistance of the amplifier of the reception amplification circuit in response to conduction of the first control device. In response to conduction of the first control device, the third control device controls the time for which the second control device operates.
    • 超声波测距仪能够有效地去除高级直接传输的波浪成分。 即使在低温下也可使用测距仪。 测距仪包括输入信号处理电路,输出信号处理电路和插入在输入和输出信号处理电路之间的增益控制电路。 输出信号处理电路包括接收放大电路和检测电路,接收放大电路具有放大器。 增益控制电路降低接收放大电路的增益,以提高未检测到和检测到的施加到检测电路的输入电压电平。 增益控制电路包括三个控制装置。 当其输入脉冲信号从低电平变化到高电平时,第一控制装置被驱动导通。 第二控制装置响应于第一控制装置的导通而降低接收放大电路的放大器的反馈电阻。 响应于第一控制装置的导通,第三控制装置控制第二控制装置工作的时间。
    • 8. 发明授权
    • Mechanical quantity sensor
    • 机械量传感器
    • US07355321B2
    • 2008-04-08
    • US10562363
    • 2004-05-27
    • Muneharu Yamashita
    • Muneharu Yamashita
    • H01L41/08G01L7/00
    • G01P15/09G01P15/097
    • A mechanical quantity sensor includes a current-to-voltage converter/signal adder circuit that converts electric current signals flowing through two piezoelectric vibrators into voltage signals. The piezoelectric vibrators receive stresses generated by a mechanical quantity, such as acceleration, in opposite directions. A voltage amplifier/amplitude limiter circuit amplifies an added signal obtained from the two voltage signals and limits its amplitude. A phase-difference-to-voltage converter circuit detects a difference in the phases of the added signal and a feedback voltage signal applied to an acceleration detection element. A phase shifter circuit controls the phase of the feedback voltage signal so that the phase is a predetermined phase. A filter circuit minimizes frequency components higher than an oscillation frequency in an unwanted frequency band. By increasing the resistance of resistors so as to increase the damping ratio, temperature stability is increased. Accordingly, abnormal oscillation is prevented by the filter circuit, and fluctuation in the characteristics is minimized by the phase control circuit.
    • 机械量传感器包括将流过两个压电振动器的电流信号转换为电压信号的电流 - 电压转换器/信号加法器电路。 压电振动器以相反的方向接收由诸如加速度的机械量产生的应力。 电压放大器/限幅器电路放大从两个电压信号获得的相加信号并限制其幅度。 相位差 - 电压转换器电路检测加法信号的相位差和施加到加速度检测元件的反馈电压信号。 移相器电路控制反馈电压信号的相位,使得相位是预定相位。 滤波器电路使不需要的频带中的振荡频率高的频率分量最小化。 通过增加电阻的阻值以增加阻尼比,温度稳定性提高。 因此,通过滤波电路防止异常振荡,并且通过相位控制电路使特性的波动最小化。
    • 9. 发明授权
    • Mechanical force sensor
    • 机械力传感器
    • US06763726B2
    • 2004-07-20
    • US10329507
    • 2002-12-27
    • Muneharu Yamashita
    • Muneharu Yamashita
    • G01L700
    • G01P15/097G01L1/162G01P15/09
    • A mechanical-force sensor includes two piezoelectric vibrators which are arranged such that stresses in mutually opposite directions are applied thereto by a mechanical force such as an acceleration. A current-voltage converter and signal-summing circuit converts current signals that flow through the two piezoelectric vibrators into voltage signals. A voltage-amplifier and amplitude limiter circuit amplifies a sum signal of the two voltage signals, and provides a positive feedback of a voltage signal that is in phase with the current signals, thereby causing an oscillating operation. A phase difference-voltage converter circuit generates a voltage signal that is proportional to the phase difference between the voltage signals yielded by the conversion. An amplifier and filter circuit DC-amplifies the voltage signal and removes unwanted frequency components therefrom.
    • 机械力传感器包括两个压电振动器,它们被布置成使得通过诸如加速度的机械力将相互相反方向的应力施加到其上。 电流 - 电压转换器和信号求和电路将流经两个压电振动器的电流信号转换为电压信号。 电压放大器和幅度限制器电路放大两个电压信号的和信号,并提供与电流信号同相的电压信号的正反馈,从而引起振荡操作。 相位差电压转换器电路产生与转换产生的电压信号之间的相位差成比例的电压信号。 放大器和滤波器电路对电压信号进行直流放大,并从其中去除不需要的频率分量。
    • 10. 发明授权
    • Dynamic-quantity sensor
    • 动态量传感器
    • US07343802B2
    • 2008-03-18
    • US11468796
    • 2006-08-31
    • Muneharu Yamashita
    • Muneharu Yamashita
    • G01P15/09G01C19/00
    • G01L1/162G01P15/09
    • A piezoelectric-vibrator series circuit including two series-connected piezoelectric vibrators to which stresses induced by a dynamic quantity are applied in opposite directions is used, and a Colpitts oscillator circuit is defined by the piezoelectric-vibrator series circuit and an amplifier circuit/load impedance circuit. A phase-difference-to-voltage converter circuit is provided to convert a phase difference between an output voltage of the oscillator circuit and a voltage at a piezoelectric-vibrator series node of the piezoelectric-vibrator series circuit into a voltage signal.
    • 使用包括两个串联连接的压电振动器的压电振动器串联电路,其中以相反方向施加由动态量引起的应力,并且Colpitts振荡器电路由压电振动器串联电路和放大器电路/负载阻抗 电路。 提供了一个相位差电压转换器电路,用于将振荡器电路的输出电压和压电振动器串联电路的压电振动器串联节点处的电压之间的相位差转换为电压信号。