Patent ID: 8552513
Filing Date: 2013-10-08
Classification: G01L,H01L

Abstract:
1. A semiconductor pressure sensor comprising: a cavity disposed through digging in a one silicon substrate of a SOI (Silicon-On-Insulator) substrate having two silicon substrates bonded to each other with an oxide film therebetween; and a diaphragm formed from the other silicon substrate and the oxide film, wherein a periodic uneven section is disposed, in the digging direction, on an inner wall surface of the cavity in the one silicon substrate, the oxide film, bordering the cavity, of the diaphragm includes an arc-shaped section at a boundary portion to the one silicon substrate defining the inner wall side surface of the cavity, the arc-shaped section having the same width as the width of the cavity at a desired section of the cavity in the one silicon substrate and reducing the width of the cavity from the boundary portion toward the diaphragm center, and the arc-shaped section is disposed continuously from the periodic uneven section of the one silicon substrate.