Patent ID: 9696339
Date: 2017-07-04
CPC Classifications: G01P

Claim:
1. A three-axis micro accelerometer, comprising a substrate, a suspending mass block suspended in the substrate, a group of Y direction displacement detection electrodes, a group of Z direction displacement detection electrodes and a group of X direction displacement detection electrodes; the Y, Z and X direction displacement detection electrodes being arranged on the substrate adjacent to the mass block; the Y and X directions being perpendicular in a plane of the mass block and the Z direction being perpendicular to the plane; wherein: the mass block and the Y, Z and X direction displacement detection electrodes respectively comprise a plurality of metal layers and a dielectric layer between two metal layers; in the mass block, portions corresponding to the Y, Z and X direction displacement detection electrodes respectively comprise at least two metal layers connected by a via; each of the Y, Z and X direction displacement detection electrodes comprises two sub-groups of electrodes, each comprising at least two metal layers connected by a via; and the Y direction displacement detection electrodes and the Z direction displacement detection electrodes are provided in a first portion of a structure formed by the mass block and the detection electrodes and the X direction displacement detection electrodes is provided in a second portion of the structure other than the first portion.