Patent ID: 8461665
Filing Date: 2013-06-11
Classification: H01L,H03H

Abstract:
1. A stacked wafer assembly including a first wafer anodically bonded to a second wafer and defining a plurality of package products each having a cavity enclosing an operation piece, the assembly comprising: a product area in the first wafer including a plurality of concave portions each comprising a portion of the cavity in the stacked wafer assembly, the product area having an outer perimeter with respect to a geometric center of the first wafer; and the first wafer further including grooves or slits extending from a proximal portion at the geometric center of the first wafer in a radial direction toward a perimeter of the first wafer, the grooves or slits extending beyond the outer perimeter of the product area to a distal terminal portion located proximal to the perimeter of the first wafer.