CAPACITIVE PROXIMITY SENSOR, PROXIMITY DETECTION METHOD AND ELECTRODE STRUCTURE OF CAPACITIVE PROXIMITY SENSOR

摘要

PROBLEM TO BE SOLVED: To provide a capacitive proximity sensor capable of optionally setting an area of a detection region by improving the directivity without requiring a three-dimensional sensor structure, a detection method and an electrode structure.;SOLUTION: A capacitive proximity sensor 100 includes a sensor part 10 and a detection circuit part 20. The sensor part 10 includes first sensor electrodes 11a, 11b, a second sensor electrode 11c, a shield electrode 12, first auxiliary electrodes 13a, 13b, and a second auxiliary electrode 13c. These are connected to a positive input terminal P or a negative input terminal N of a C-V conversion circuit 21 of the detection circuit part 20, a shield driving circuit 24, or the like by change over switches SW1 to SW4. The changeover switches SW1 to SW4 are provided on the side 1 and the side 2, and can be selectively switched. The detection range of the sensor part 10 is optionally set by operation such as comparison between the capacitances C1, C2 detected by the C-V conversion circuit 21 upon switching to the side 1 and the side 2 by these changeover switches SW1 to SW4.;COPYRIGHT: (C)2011,JPO&INPIT