US Patent 7655995 Semiconductor device using MEMS technology

A semiconductor device using a MEMS technology according to an example of the present invention comprises a cavity, a lower electrode provided in a lower part of the cavity, an actuator provided in an upper part or inside of the cavity, an upper electrode connected to the actuator, and a conductive layer in contact with the lower electrode outside the cavity via a contact hole whose bottom face is provided above an upper face of the lower electrode in the cavity.