发明名称 |
Capacitance change detection device |
摘要 |
<p>A capacitance change detection device includes a sensor electrode, and an electrode capacitance measurement device for measuring capacitance of the sensor electrode on the basis of a correlation value based on a reference capacitance at every first predetermined time. A detection signal is generated when a current measurement value of capacitance is changed by equal to or greater predetermined threshold value than a measurement value obtained a second predetermined time before the current measurement value is measured. The capacitance change detection device further includes a sensitivity compensation capacitance for generating capacitance variations equivalent to specific variations of capacitance of the sensor electrode, and being switched between a connected state and a disconnected state. The threshold value is determined as a difference between measurement values of capacitance of the sensor electrode measured at the connected state and at the disconnected state. The threshold value is renewed at every third predetermined time.</p> |
申请公布号 |
EP1583236(B1) |
申请公布日期 |
2012.05.02 |
申请号 |
EP20050006301 |
申请日期 |
2005.03.22 |
申请人 |
AISIN SEIKI KABUSHIKI KAISHA |
发明人 |
INABA, HISASHI;KURACHI, KOHEI;HATANO, RIKUO |
分类号 |
E05B49/00;H03K17/955;B60R25/01;B60R25/24;G01D5/24;G01R27/26;G01V3/08 |
主分类号 |
E05B49/00 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|