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11. 发明授权

US09097558B2 Position sensor 有权
标题翻译：位置传感器
公开(公告)号：US09097558B2
公开(公告)日：2015-08-04
申请号：US13637693
申请日：2011-02-23
申请人： Masahisa Niwa , Kunitaka Okada
发明人： Masahisa Niwa , Kunitaka Okada
IPC分类号： G01R27/02 , G01D5/20
CPC分类号： G01D5/2013
摘要： A position sensor includes a detector, an oscillation circuit, a signal processing circuit, and a resonance circuit having a detection coil and a capacitor. The oscillation circuit forms a negative feedback loop from: an amplitude detection circuit that detects an amplitude of an oscillation signal outputted from the resonance circuit; an integrating circuit that outputs a signal corresponding to a difference between a predetermined reference voltage and the amplitude of the oscillation signal; a negative conductance control circuit that, based on the output of the integrating circuit, controls the negative conductance of the oscillation circuit such that the amplitude of the oscillation signal is equals to the predetermined reference voltage; and an operational amplifier that adjusts such that the oscillation voltage of the resonance circuit is equal to the applied voltage of the negative conductance control circuit.
摘要翻译：位置传感器包括检测器，振荡电路，信号处理电路和具有检测线圈和电容器的谐振电路。所述振荡电路从检测从所述谐振电路输出的振荡信号的振幅的振幅检测电路形成负反馈回路; 积分电路，其输出与预定参考电压和振荡信号的振幅之间的差相对应的信号; 负电导控制电路，其基于所述积分电路的输出，控制所述振荡电路的负电导，使得所述振荡信号的振幅等于所述规定的基准电压; 以及调节使得谐振电路的振荡电压等于负电导控制电路的施加电压的运算放大器。

12. 发明授权

US08427138B2 Position sensor 有权
标题翻译：位置传感器
公开(公告)号：US08427138B2
公开(公告)日：2013-04-23
申请号：US13026798
申请日：2011-02-14
申请人： Kunitaka Okada , Masahisa Niwa
发明人： Kunitaka Okada , Masahisa Niwa
IPC分类号： G01B7/14
CPC分类号： G01B7/003
摘要： The position sensor includes a moving member configured to be displaced in response to displacement of a measurement target, a resonant unit, an oscillation unit, a signal processing unit, an output unit, a signal absence detection unit, and a low-pass filter. The resonant unit includes a detection coil. The oscillation unit is configured to output an oscillation signal. The signal absence detection unit is configured to judge whether or not the oscillation signal is output from the oscillation unit. The low-pass filter is configured to have a cut-off frequency which passes the oscillation signal corresponding to the resonant frequency of the resonant unit in a normal condition, but blocks the oscillation signal output from the oscillation unit when the resonant unit sees an oscillation at an abnormal frequency.
摘要翻译：位置传感器包括响应于测量对象，谐振单元，振荡单元，信号处理单元，输出单元，信号缺失检测单元和低通滤波器的位移而移位的移动构件。谐振单元包括检测线圈。振荡单元被配置为输出振荡信号。信号缺失检测单元被配置为判断振荡信号是否从振荡单元输出。低通滤波器被配置为具有在正常状态下通过与谐振单元的谐振频率对应的振荡信号的截止频率，但是当谐振单元看到振荡时，阻断从振荡单元输出的振荡信号在异常频率。

13. 发明申请

US20080290861A1 DISPLACEMENT SENSOR 有权
标题翻译：位移传感器
公开(公告)号：US20080290861A1
公开(公告)日：2008-11-27
申请号：US12120411
申请日：2008-05-14
申请人： Masahisa NIWA , Yukiko NISHIDA , Kunitaka OKADA
发明人： Masahisa NIWA , Yukiko NISHIDA , Kunitaka OKADA
IPC分类号： G01B7/02
CPC分类号： G01D5/202
摘要： An oscillator circuit outputs an oscillator signal with a frequency corresponding to an inductance of a displacement detector coil. An oscillation cycle measurement circuit measures a cycle of the oscillator signal output from the oscillator circuit, and outputs a signal corresponding to the measured cycle. A squaring circuit calculates and outputs a square of the signal output from the oscillation cycle measurement circuit. By the calculation and output of the square of the oscillator signal cycle, a square root component of the product of inductance and capacitance components is eliminated, so that the output signal changes linearly relative to the displacement of a displacement body. As a result, the linearity of the output signal relative to the displacement of the displacement body can be improved.
摘要翻译：振荡器电路输出具有对应于位移检测器线圈的电感的频率的振荡器信号。振荡周期测量电路测量从振荡器电路输出的振荡器信号的周期，并输出与测量周期对应的信号。平方电路计算并输出从振荡周期测量电路输出的信号的平方。通过振荡器信号周期的平方的计算和输出，消除了电感和电容分量乘积的平方根分量，使得输出信号相对于位移体的位移线性变化。结果，能够提高输出信号相对于位移体的位移的线性。

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