Patent ID: 8701490

Claim:
A Z-axis capacitive accelerometer, comprising: a substrate; a capacitance sensing plate; a proof mass; and at least one pair of spring beams, wherein the proof mass and the capacitance sensing plate are separated from each other, and two sensing areas of differential capacitance are located opposite to a rotational axis of the sensing plate and outside the proof mass, and when the proof mass rotates in a first direction due to an applied acceleration, the capacitance sensing plate rotates in an opposite direction to create the angular displacement for measurement, wherein the capacitance sensing plate has a first rotation axis, the proof mass has a second rotation axis and the first and second rotation axes are parallel to each other, and wherein the first rotation axis comprises: an upper first rotation axis; a lower first rotation axis; and a first anchor point connecting the upper first rotation axis and the lower first rotation axis.