Patent ID: 8503157

Claim:
A MEMS device comprising: first and second lower electrodes on a substrate; a first driving electrode which is provided above the first lower electrode with a first insulating film interposed therebetween and which forms a fixed capacitance element having a first capacitance between the first lower electrode and the first driving electrode; a second driving electrode which is provided above the second lower electrode with a second insulating film interposed therebetween and which forms a fixed capacitance element having a second capacitance between the second lower electrode and the second driving electrode; and an upper electrode which is supported by first and second anchors in midair above the first and second driving electrodes and which moves toward the first and second driving electrodes and which has a variable third capacitance between the first driving electrode and the upper electrode and has a variable fourth capacitance between the second driving electrode and the upper electrode, a first spring structure including a first material, one end of the first spring structure connected to the upper electrode and the other end of the first spring structure connected to the first anchor; a second spring structure including a second material different from the first material, one end of the second spring structure connected to the upper electrode and the other end of the second spring structure connected to the second anchor.