Patent ID: 8443670

Claim:
A sensing accelerometer, comprising: a substrate further comprising: at least four fixed electrode plates; and a movable unit further comprising: a movable electrode having at least four edges; and plural components connected to the substrate and the movable element, wherein the plural components are flexible components, the substrate is a fixing substrate and comprises plural fixed anchors respectively connected to the plural flexible components, the at least four fixed electrode plates are disposed beside the at least four edges of the movable electrode so as to sense an X-axis, a Y-axis and a Z-axis accelerations, each of the at least four plural fixed electrode plates and the movable electrode has a via disposed therein, and the at least four plural fixed electrode plates comprises: plural lower electrode plates respectively placed along a first group of the plural edges of the movable electrode, and providing a lower limit of the movable unit in the Z-axis movement, wherein the first group of the plural edges has an even total number, and includes plural pairs of associated opposite edges; and plural upper electrode plates respectively placed along a second group of the plural edges of the movable electrode, and providing an upper limit in the Z-axis movement for the movable unit, wherein the second group of the plural edges has an even total number, and includes plural pairs of associated opposite edges, wherein each of the plural lower electrode plates has a portion being held under the movable electrode, and each of the plural upper electrode plates has a portion being held over the movable electrode.