| 摘要 |
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). |
