Patent ID: 6997054

Claim:
An inertial detecting device for detecting a change in capacitance of a sensor element caused by an inertial force, the sensor element comprising: a substrate and a structure bonded to the substrate with a gap between at least part of the structure and the substrate, wherein, the structure includes a displaceable unit and at least one pair of detection units for detecting displacement of the displaceable unit, the displaceable unit includes a movable mass member displaceable along an inertial force direction, a pair of beams which are connected to the movable mass member and support the movable mass member in a space opposite the gap, and a pair of anchors which support the beams and are bonded to the substrate, each of the detection units includes a respective pair of sensing electrodes, respective sensing electrodes of each pair being disposed on opposite first and second sides of the displaceable unit, each of the sensing electrodes is supported opposite and spaced from the substrate, and each pair of sensing electrodes defines a respective pair of variable gaps between the sensing electrodes and the displaceable unit, each pair of variable gaps having a respective different width when the displaceable unit is not displaced, and each of the detection units includes a drive unit for moving each sensing electrode toward and away from the displaceable unit.