公开(公告)号：US20060250267A1

公开(公告)日：2006-11-09

申请号：US11415230

申请日：2006-05-02

申请人： Akinobu Umemura ,  Junji Hayakawa ,  Takaaki Kawai

发明人： Akinobu Umemura ,  Junji Hayakawa ,  Takaaki Kawai

IPC分类号： G08B21/00

CPC分类号： G01P15/131 ,  G01P15/125

摘要： A substrate forming a sensor element is connected to a non-inverting input terminal of an operational amplifier, and a common voltage is applied thereto from a reference voltage supply circuit to fix them to the same potential. Thus, the impedances of the non-inverting input terminal and of the inverting input terminal of the operational amplifier are matched with respect to the power source. Therefore, noise superposed on a power source line can be greatly decreased by noise-removing characteristics determined by CMRR characteristics of the operational amplifier. As a result, a capacitive-type acceleration sensor exhibits sensor characteristics of frequency noise suppressing effect.

摘要翻译： 形成传感器元件的基板连接到运算放大器的非反相输入端子，并且从参考电压供给电路向其施加公共电压以将它们固定为相同的电位。 因此，运算放大器的非反相输入端子和反相输入端子的阻抗相对于电源是匹配的。 因此，通过由运算放大器的CMRR特性确定的噪声去除特性，可以大大降低叠加在电源线上的噪声。 结果，电容型加速度传感器具有频率噪声抑制效果的传感器特性。

公开(公告)号：US20060061372A1

公开(公告)日：2006-03-23

申请号：US11227983

申请日：2005-09-16

申请人： Junji Hayakawa ,  Norio Kitao ,  Akinobu Umemura ,  Hirokazu Ito ,  Takaaki Kawai

发明人： Junji Hayakawa ,  Norio Kitao ,  Akinobu Umemura ,  Hirokazu Ito ,  Takaaki Kawai

IPC分类号： G01R27/26

CPC分类号： G01P15/18 ,  G01P15/125 ,  G01P2015/0814

摘要： In a capacitive physical quantity sensor, a C-V converter converts a variation in a capacitance between a movable electrode and a fixed electrode into a voltage to output the converted voltage in a first operating mode. The C-V converter also outputs a constant voltage in a second operating mode. An amplifier amplifies the converted voltage to output a first voltage, and amplifies the constant voltage to output a second voltage. A first sample and hold circuit operates in the first operating mode to sample and hold the first voltage. A second sample and hold circuit operates in the second operating mode to sample and hold the second voltage. A first differential amplifier obtains a difference voltage between the first voltage held by the first sample and hold circuit and the second voltage held by the second sample and hold circuit.

公开(公告)号：US07456731B2

公开(公告)日：2008-11-25

申请号：US11415230

申请日：2006-05-02

申请人： Akinobu Umemura ,  Junji Hayakawa ,  Takaaki Kawai

发明人： Akinobu Umemura ,  Junji Hayakawa ,  Takaaki Kawai

IPC分类号： G01P15/125

CPC分类号： G01P15/131 ,  G01P15/125

摘要： A substrate forming a sensor element is connected to a non-inverting input terminal of an operational amplifier, and a common voltage is applied thereto from a reference voltage supply circuit to fix them to the same potential. Thus, the impedances of the non-inverting input terminal and of the inverting input terminal of the operational amplifier are matched with respect to the power source. Therefore, noise superposed on a power source line can be greatly decreased by noise-removing characteristics determined by CMRR characteristics of the operational amplifier. As a result, a capacitive-type acceleration sensor exhibits sensor characteristics of frequency noise suppressing effect.

摘要翻译： 形成传感器元件的基板连接到运算放大器的非反相输入端子，并且从参考电压供给电路向其施加公共电压以将它们固定为相同的电位。 因此，运算放大器的非反相输入端子和反相输入端子的阻抗相对于电源是匹配的。 因此，通过由运算放大器的CMRR特性确定的噪声去除特性，可以大大降低叠加在电源线上的噪声。 结果，电容型加速度传感器具有频率噪声抑制效果的传感器特性。

公开(公告)号：US07109727B2

公开(公告)日：2006-09-19

申请号：US11227983

申请日：2005-09-16

申请人： Junji Hayakawa ,  Norio Kitao ,  Akinobu Umemura ,  Hirokazu Ito ,  Takaaki Kawai

发明人： Junji Hayakawa ,  Norio Kitao ,  Akinobu Umemura ,  Hirokazu Ito ,  Takaaki Kawai

IPC分类号： G01R27/26 ,  G01P21/00

CPC分类号： G01P15/18 ,  G01P15/125 ,  G01P2015/0814

摘要： In a capacitive physical quantity sensor, a C-V converter converts a variation in a capacitance between a movable electrode and a fixed electrode into a voltage to output the converted voltage in a first operating mode. The C-V converter also outputs a constant voltage in a second operating mode. An amplifier amplifies the converted voltage to output a first voltage, and amplifies the constant voltage to output a second voltage. A first sample and hold circuit operates in the first operating mode to sample and hold the first voltage. A second sample and hold circuit operates in the second operating mode to sample and hold the second voltage. A first differential amplifier obtains a difference voltage between the first voltage held by the first sample and hold circuit and the second voltage held by the second sample and hold circuit.

摘要翻译： 在电容物理量传感器中，C-V转换器将可移动电极和固定电极之间的电容变化转换成电压，以在第一操作模式下输出转换的电压。 C-V转换器还在第二操作模式下输出恒定电压。 放大器放大转换的电压以输出第一电压，并放大恒定电压以输出第二电压。 第一采样和保持电路在第一操作模式下工作以采样和保持第一电压。 第二采样和保持电路在第二操作模式下工作以采样和保持第二电压。 第一差分放大器获得由第一采样和保持电路保持的第一电压与由第二采样和保持电路保持的第二电压之间的差分电压。

公开(公告)号：US07295045B2

公开(公告)日：2007-11-13

申请号：US11296464

申请日：2005-12-08

申请人： Takaaki Kawai ,  Junji Hayakawa

发明人： Takaaki Kawai ,  Junji Hayakawa

IPC分类号： H03K5/22

CPC分类号： H03K5/24

摘要： An output signal cutting-off circuit includes a first switching element, a driving circuit and a voltage-drop-signal generating circuit. When a voltage to be monitored becomes lower than a threshold voltage, a voltage-drop-signal is generated and supplied to the driving circuit. The driving circuit turns on the first switching element based on the voltage-drop-signal to thereby cut off an output signal voltage by bringing it to a ground potential. When the voltage-drop-signal disappears, the first switching element is turned off to bring the output signal to a normal state. Preferably, a second switching element for charging a capacitor and a third switching element for discharging the capacitor are used in the driving circuit. In this case, the first switching element is turned on or off based on a voltage of the capacitor.

摘要翻译： 输出信号切断电路包括第一开关元件，驱动电路和电压降信号发生电路。 当要监视的电压变得低于阈值电压时，产生电压降信号并将其提供给驱动电路。 驱动电路基于电压降信号导通第一开关元件，从而通过使其接地而切断输出信号电压。 当电压降信号消失时，第一开关元件断开，使输出信号进入正常状态。 优选地，在驱动电路中使用用于对电容器充电的第二开关元件和用于放电电容器的第三开关元件。 在这种情况下，第一开关元件基于电容器的电压而导通或截止。

公开(公告)号：US20060164129A1

公开(公告)日：2006-07-27

申请号：US11296464

申请日：2005-12-08

申请人： Takaaki Kawai ,  Junji Hayakawa

发明人： Takaaki Kawai ,  Junji Hayakawa

IPC分类号： H03K5/22

CPC分类号： H03K5/24

摘要： An output signal cutting-off circuit includes a first switching element, a driving circuit and a voltage-drop-signal generating circuit. When a voltage to be monitored becomes lower than a threshold voltage, a voltage-drop-signal is generated and supplied to the driving circuit. The driving circuit turns on the first switching element based on the voltage-drop-signal to thereby cut off an output signal voltage by bringing it to a ground potential. When the voltage-drop-signal disappears, the first switching element is turned off to bring the output signal to a normal state. Preferably, a second switching element for charging a capacitor and a third switching element for discharging the capacitor are used in the driving circuit. In this case, the first switching element is turned on or off based on a voltage of the capacitor.

摘要翻译： 输出信号切断电路包括第一开关元件，驱动电路和电压降信号发生电路。 当要监视的电压变得低于阈值电压时，产生电压降信号并将其提供给驱动电路。 驱动电路基于电压降信号导通第一开关元件，从而通过使其接地而切断输出信号电压。 当电压降信号消失时，第一开关元件断开，使输出信号进入正常状态。 优选地，在驱动电路中使用用于对电容器充电的第二开关元件和用于放电电容器的第三开关元件。 在这种情况下，第一开关元件基于电容器的电压而导通或截止。

公开(公告)号：US07168320B2

公开(公告)日：2007-01-30

申请号：US10895978

申请日：2004-07-22

申请人： Minoru Murata ,  Takaaki Kawai

发明人： Minoru Murata ,  Takaaki Kawai

IPC分类号： G01P15/125

CPC分类号： G01P15/125 ,  G01P15/131

摘要： A physical quantity (e.g., acceleration) sensing unit is provided. In this unit, a capacitive sensor has first and second fixed electrodes and a physical-quantity-sensitive movable electrode disposed between the first and second fixed electrodes. An adjusting circuit first adjusts a first bias voltage applied between the first fixed electrode and the movable electrode and a second voltage applied between the movable electrode and the second fixed electrode so that the movable electrode is brought into contact with either the first or second fixed electrode. The adjusting circuit then adjusts the first and second bias voltages to return the movable electrode to its original position. A detecting circuit detects an output on a capacitance relationship among the first and second fixed electrodes and the movable electrode. The output is subjected to determination of whether or not the output is out of order, when tested.

摘要翻译： 提供物理量（例如，加速度）感测单元。 在该单元中，电容传感器具有第一和第二固定电极以及设置在第一和第二固定电极之间的物理量敏感可动电极。 调整电路首先调整施加在第一固定电极与可动电极之间的第一偏置电压和施加在可动电极与第二固定电极之间的第二电压，使得可动电极与第一或第二固定电极 。 然后调整电路调节第一和第二偏置电压，以将可动电极返回到其初始位置。 检测电路检测第一和第二固定电极与可动电极之间的电容关系的输出。 当测试时，输出将确定输出是否失效。

公开(公告)号：US08616061B2

公开(公告)日：2013-12-31

申请号：US13425460

申请日：2012-03-21

申请人： Makiko Sugiura ,  Yasuyuki Okuda ,  Takaaki Kawai ,  Takahiko Yoshida ,  Hisanaga Matsuoka ,  Toshiki Isogai ,  Mitsuyasu Matsuura

发明人： Makiko Sugiura ,  Yasuyuki Okuda ,  Takaaki Kawai ,  Takahiko Yoshida ,  Hisanaga Matsuoka ,  Toshiki Isogai ,  Mitsuyasu Matsuura

IPC分类号： G01N29/32 ,  G01S3/82 ,  G08G1/14 ,  G08G1/04 ,  G01N29/44

CPC分类号： G01S7/52004 ,  G01S7/52 ,  G01S7/52006 ,  G01S7/521 ,  G01S15/003 ,  G01S15/876 ,  G01S15/931 ,  G01S2015/939

摘要： An ultrasonic sensor includes a transmitting device, a receiving device, and a circuit device. The circuit device determines that the receiving device receives an ultrasonic wave reflected from an object, when an output voltage of the receiving device is equal to or greater than a first threshold. The circuit device includes a humidity detection section configured to detect an ambient humidity of the transmitting and receiving devices and a threshold adjustment section configured to calculate, based on the detected ambient humidity, a sound pressure of the ultrasonic wave that is received by the receiving device after propagating over a round-trip distance between the ultrasonic sensor and the object. The threshold adjustment section reduces the first threshold, when the output voltage corresponding to the calculated sound pressure is less than a second threshold that is greater the first threshold.

公开(公告)号：US20110261651A1

公开(公告)日：2011-10-27

申请号：US13158006

申请日：2011-06-10

申请人： Yasuyuki Okuda ,  Takaaki Kawai ,  Makiko Sugiura ,  Takayuki Ishikawa

发明人： Yasuyuki Okuda ,  Takaaki Kawai ,  Makiko Sugiura ,  Takayuki Ishikawa

IPC分类号： G01S15/04

CPC分类号： G01S7/521 ,  B06B1/0629 ,  G01S3/808 ,  G01S7/52004 ,  G01S15/42 ,  G01S15/931

摘要： An ultrasonic sensor includes a transmitting device, receiving devices arranged in an array, and a circuit device. One receiving device is configured as a reference receiving device. The circuit device includes a reference signal generator and first and second synchronous detectors. The reference signal generator generates a reference signal by using a received signal of the reference receiving device. The first synchronous detector performs synchronous detection of a received signal of one of the receiving devices based on the reference signal to detect a distance to an object. The second synchronous detector performs synchronous detection of received signals of the receiving devices except the reference receiving device based on the reference signal to detect a direction of the object.

摘要翻译： 超声波传感器包括发送装置，排列成阵列的接收装置和电路装置。 一个接收设备被配置为参考接收设备。 电路装置包括参考信号发生器和第一和第二同步检测器。 参考信号发生器通过使用参考接收装置的接收信号产生参考信号。 第一同步检测器基于参考信号执行接收装置之一的接收信号的同步检测，以检测到对象的距离。 第二同步检测器基于参考信号执行除基准接收装置之外的接收装置的接收信号的同步检测，以检测对象的方向。

公开(公告)号：US20050016273A1

公开(公告)日：2005-01-27

申请号：US10895978

申请日：2004-07-22

申请人： Minoru Murata ,  Takaaki Kawai

发明人： Minoru Murata ,  Takaaki Kawai

IPC分类号： G01P21/00 ,  B60R21/16 ,  G01P15/125 ,  G01P15/13 ,  G01P15/00

CPC分类号： G01P15/125 ,  G01P15/131

摘要： A physical quantity (e.g., acceleration) sensing unit is provided in this unit, a capacitive sensor has first and second fixed electrodes and a physical-quantity-sensitive movable electrode disposed between the first and second fixed electrodes. An adjusting circuit first adjusts a first bias voltage applied between the first fixed electrode and the movable electrode and a second voltage applied between the movable electrode and the second fixed electrode so that the movable electrode is brought into contact with either the first or second fixed electrode. The adjusting circuit then adjusts the first and second bias voltages to return the movable electrode to its original position. A detecting circuit detects an output on a capacitance relationship among the first and second fixed electrodes and the movable electrode. The output is subjected to determination of whether or not the output is out of order, when tested.

摘要翻译： 在该单元中提供物理量（例如加速度）感测单元，电容传感器具有第一和第二固定电极以及设置在第一和第二固定电极之间的物理量敏感可动电极。 调整电路首先调整施加在第一固定电极与可动电极之间的第一偏置电压和施加在可动电极与第二固定电极之间的第二电压，使得可动电极与第一或第二固定电极 。 然后调整电路调节第一和第二偏置电压，以将可动电极返回到其初始位置。 检测电路检测第一和第二固定电极与可动电极之间的电容关系的输出。 当测试时，输出将确定输出是否失效。