Patent ID: 7674638

Claim:
A method of producing a sensor device comprising the steps of: providing a sensor substrate, which comprises a frame having an opening, a movable portion movably held in said opening, and a detection portion configured to output an electric signal according to a positional displacement of said movable portion, a first package substrate bonded to one of opposite surfaces of said sensor substrate, and a second package substrate bonded to the other surface of said sensor substrate; forming a first surface-activated region on a surface of said frame facing the first package substrate over an entire circumference of said frame so as to surround said movable portion; forming a second surface-activated region on a surface of said frame facing the second package substrate over an entire circumference of said frame so as to surround said movable portion; forming a surface-activated region on each of the first package substrate and the second package substrate; and forming a direct bonding between said first surface-activated region and said surface-activated region of the first package substrate, and a direct bonding between said second surface-activated region and said surface-activated region of the second package substrate at room temperature.