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    • 3. 发明授权
    • Capacitance type physical quantity detector
    • 电容式物理量检测器
    • US07267002B2
    • 2007-09-11
    • US11185751
    • 2005-07-21
    • Toshikazu ItakuraToshiki Isogai
    • Toshikazu ItakuraToshiki Isogai
    • G01R27/26G01N19/00
    • G01D5/24G01D5/2405G01N27/223
    • A capacitance type physical quantity detector includes a sensor unit of which the capacitance varies depending upon a change in the physical quantity and a C-V converter unit which converts a change in the capacitance of said sensor unit into a voltage. The C-V converter unit includes an operational amplifier, a feedback capacitor, switching means connected in parallel with said feedback capacitor, a reference voltage-generating circuit for applying a reference voltage to the operational amplifier, and a drive voltage-generating circuit for applying a drive voltage to said sensor unit. At least any one of the feedback capacitance of said feedback capacitor, the reference voltage formed by said reference voltage-generating circuit or the drive voltage formed by said drive voltage-generating circuit varies depending upon the temperature to correct temperature characteristics of the sensor unit.
    • 电容型物理量检测器包括其电容根据物理量的变化而变化的传感器单元和将所述传感器单元的电容变化转换为电压的C-V转换器单元。 CV转换器单元包括运算放大器,反馈电容器,与所述反馈电容并联连接的开关装置,用于向运算放大器施加参考电压的基准电压产生电路,以及用于施加驱动的驱动电压产生电路 电压到所述传感器单元。 所述反馈电容器的反馈电容,所述参考电压产生电路形成的参考电压或由所述驱动电压产生电路形成的驱动电压中的至少一个根据温度而变化,以校正传感器单元的温度特性。
    • 7. 发明申请
    • Humidity sensor
    • 湿度传感器
    • US20080257037A1
    • 2008-10-23
    • US12081513
    • 2008-04-17
    • Toshiki IsogaiToshikazu Itakura
    • Toshiki IsogaiToshikazu Itakura
    • G01N27/22
    • G01N27/225
    • A capacitive humidity sensor includes: a humidity sensing element with a humidity sensitive film and electrodes; and a processing circuit. The film has a dielectric constant variable in accordance with moisture. The electrodes detect capacitance of the film and outputs a signal corresponding to the capacitance. The processing circuit processes the signal. The film is made of inorganic material having fine pores for adsorbing the moisture. A diameter of the fine pores is set to be a predetermined diameter so that capillary tube aggregation phenomenon occurs at a predetermined relative humidity. The capacitance of the film has a change rate with respect to the relative humidity. The change rate in case of the relative humidity higher than the predetermined relative humidity is larger than that in case of the relative humidity lower than the predetermined relative humidity.
    • 电容式湿度传感器包括:具有湿敏膜和电极的湿度感测元件; 和处理电路。 该膜具有根据水分变化的介电常数。 电极检测胶片的电容并输出对应于电容的信号。 处理电路处理该信号。 该膜由具有用于吸附水分的细孔的无机材料制成。 细孔的直径设定为规定的直径,使得在规定的相对湿度下发生毛细管聚集现象。 膜的电容相对于相对湿度具有变化率。 在相对湿度高于预定相对湿度的情况下的变化率大于相对湿度低于预定相对湿度的情况。