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US08692565B2 Capacitive proximity sensor and proximity sensing method 有权
电容接近传感器和接近感测方法

Capacitive proximity sensor and proximity sensing method
Abstract:
A capacitive proximity sensor (100) comprises a sensor unit (10) and a sense circuit unit (20). The sensor unit (10) includes a sensor electrode (11), a shield electrode (12) and an auxiliary electrode (13). The sensor electrode (11) is connected to a C-V conversion circuit (21) and the shield electrode (12) is connected to a shield drive circuit (24). The auxiliary electrode (13) is connected via a change-over switch (30) to the C-V conversion circuit (21) or the shield drive circuit (24). The capacitance values (C1, C2) switched by the change-over switch (30) and detected at the C-V conversion circuit (21) are compared to arbitrarily set a range of a sense region on the sensor electrode (11).
Abstract(Chinese):

电容式接近传感器（100）包括传感器单元（10）和感测电路单元（20）。 传感器单元（10）包括传感器电极（11），屏蔽电极（12）和辅助电极（13）。 传感器电极（11）连接到C-V转换电路（21），屏蔽电极（12）连接到屏蔽驱动电路（24）。 辅助电极（13）通过转换开关（30）连接到C-V转换电路（21）或屏蔽驱动电路（24）。 将由转换开关（30）切换并在C-V转换电路（21）检测的电容值（C1，C2）进行比较，以任意设定传感器电极（11）上的感测区域的范围。

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