Patent ID: 9676618
Date: 2017-06-13
CPC Classifications: B81B,B81C,G01L

Claim:
1. An apparatus, comprising: a pressure sensing element; a pedestal having an aperture; a first bonding interface, the pressure sensing element bonded to the pedestal at the first bonding interface; a cavity formed as part of the pressure sensing element; a cap bonded to the pressure sensing element at a second bonding interface; a cavity formed as part of the cap; and a plurality of polished smooth areas, a portion of the plurality of polished smooth areas formed as part of the pressure sensing element adjacent the bonding interface prior to the pressure sensing element and the pedestal being partitioned from a wafer stack, and a portion of the plurality of polished smooth areas formed as part of the pedestal adjacent the bonding interface prior to the pressure sensing element and the pedestal being partitioned from the wafer stack; wherein a portion of the pressure sensing element deflects when pressure is applied to the pressure sensing element in the cavity from the aperture.