Patent ID: 7274079
Filing Date: 2007-09-25
Classification: G01D,G01P,G01V,Y10T

Abstract:
1. A method of fabricating a sensor element, comprising: using a first process to fabricate a measurement mass wafer for detecting acceleration, the measurement mass wafer including a mass housing having a cavity, and a spring mass assembly positioned within the cavity; fabricating a top cap wafer using the first process; fabricating a bottom cap wafer using the first process; forming at least one of the top cap wafer and the bottom cap wafer using a balanced metal pattem for reducing bowing of the at least one of the top cap wafer and the bottom cap wafer, such that the balanced metal pattern and a corresponding electrode capacitor are disposed on opposing parallel surfaces of the at least one of the top cap wafer and the bottom cap wafer; bonding the top cap wafer to a side of the measurement mass wafer using a bonding process; bonding the bottom cap wafer to another side of the measurement mass wafer using the bonding process; and making one or more dicing cuts at predetermined locations on the sensor element.