Title:
CAPACITANCE-TYPE SENSOR DEVICE AND CAPACITANCE-TYPE SENSOR CAPACITANCE MEASURING DEVICE
Document Type and Number:
WIPO Patent Application WO/2011/125725
Kind Code:
A1
Abstract:
Provided is a capacitance-type sensor device capable of accurately measuring a capacitance while being reduced in size.
The capacitance-type sensor device comprises: a voltage applying element (21) connected in series to the first electrode (11) of a capacitance-type sensor (10) and applying a periodic rectangular wave voltage to the capacitance-type sensor (10); a rectifier (22a) connected to the second electrode (12) of the capacitance-type sensor (10) and rectifying electrical charges charged to and discharged from the capacitance-type sensor (10) when the voltage applying element (21) applies the periodic rectangular wave voltage; a smoothing capacitor (C1) connected in parallel with the rectifier (22a); current measuring shunt resistor (R1) connected in parallel with the smoothing capacitor (C1); and a voltage measuring unit (220) for measuring voltage (Vx) between both ends of the current measuring shunt resistor (R1).
Inventors:
SHIBATA, Tetsuyoshi (LTD. 1 Higashi 3-chome, Komaki-sh, Aichi 50, 〒4858550, JP)
Application Number:
JP2011/057991
Publication Date:
October 13, 2011
Filing Date:
March 30, 2011
Export Citation:
Assignee:
TOKAI RUBBER INDUSTRIES, LTD. (1 Higashi 3-chome, Komaki-shi Aichi, 50, 〒4858550, JP)
東海ゴム工業株式会社 (〒50 愛知県小牧市東三丁目１番地 Aichi, 〒4858550, JP)
東海ゴム工業株式会社 (〒50 愛知県小牧市東三丁目１番地 Aichi, 〒4858550, JP)
International Classes:
G01L1/14; G01D5/241
Attorney, Agent or Firm:
OHKAWA, Hiroshi (2-5 Meieki 3-chome, Nakamura-ku Nagoya-sh, Aichi 02, 〒4500002, JP)
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