Patent ID: 8067769

Claim:
A wafer level package structure comprising: a semiconductor wafer having a plurality of sensor units, each of which comprises a frame having an opening, a movable portion held in said opening to be movable relative to said frame, and a detecting portion configured to output an electric signal according to a positional displacement of said movable portion; a first package wafer bonded to one of opposite surfaces of said semiconductor wafer; and a second package wafer bonded to the other surface of said semiconductor wafer; wherein said frame of each of said sensor units has a first surface-activated region formed on a surface facing the first package wafer over an entire circumference thereof so as to surround said movable portion, and a second surface-activated region formed on a surface facing the second package wafer over an entire circumference thereof so as to surround said movable portion, the bonding between said semiconductor wafer and the first package wafer is a solid-phase direct bonding without diffusion between said first surface-activated region and a surface-activated region formed on the first package wafer, and the bonding between said semiconductor wafer and the second package wafer is a solid-phase direct bonding without diffusion between said second surface-activated region and a surface-activated region formed on the second package wafer, wherein at least one of said first surface-activated region and said second surface-activated region comprises a ring-like outer surface-activated region formed over the entire circumference of said frame so as to surround said movable portion, and a ring-like inner surface-activated region formed at an inner side of said outer surface-activated region over the entire circumference of said frame so as to surround said movable portion, and wherein said wafer level package structure further comprises an auxiliary sealing portion for connecting between said outer surface-activated region and said inner surface-activated region, and wherein said auxiliary sealing portion is formed at plural locations spaced from each other by a predetermined distance in the circumferential direction of said frame.