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Patent Searching and Data


Title:
CAPACITANCE DETECTION DEVICE
Document Type and Number:
WIPO Patent Application WO/2019/187516
Kind Code:
A1
Abstract:
This capacitance detection device comprises: a sensor unit (C) including a plurality of sensor elements that are arranged two-dimensionally and have varying capacitances; row control lines (41–43); column control lines (44–46); a control circuit (20) for supplying a charging voltage to a sensor element under measurement via a row control line, measuring the change in the voltage of the sensor element, and detecting the capacitance of the sensor element; and a potential equalization circuit (18) for outputting a signal having a potential equivalent to that of the sensor element under measurement. The control circuit applies the charging voltage to the row control line connected to the sensor element under measurement and connects the column control line connected to the sensor element to the ground potential side. Further, the potential equalization circuit makes the potential of the row control lines other than the row control lines connected to the sensor element under measurement and/or the column control lines other than the column control lines connected to the sensor element under measurement equal to the potential of the sensor element under measurement.

Inventors:
UKITSU HIRONOBU
MORIURA YUTA
FURUYA HIROYUKI
MATSUMOTO TAKASHI
SAWADA YUI
Application Number:
PCT/JP2019/001229
Publication Date:
October 03, 2019
Filing Date:
January 17, 2019
Export Citation:
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Assignee:
PANASONIC IP MAN CO LTD (JP)
International Classes:
G01L1/14; G01L5/00
Domestic Patent References:
WO2011125725A12011-10-13
Foreign References:
US4644801A1987-02-24
JP2006518033A2006-08-03
JP2000258272A2000-09-22
US20140049273A12014-02-20
Attorney, Agent or Firm:
YAMAO, Norihito et al. (JP)
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