Patent ID: 6601452
Filing Date: 2003-08-05
Classification: B81B,G01L

Abstract:
A semiconductor pressure sensor comprising:a semiconductor substrate having a recess formed on a surface thereof by anisotropic etching, the recess having a sidewall, a bottom wall that serves as a diaphragm for detecting a pressure, and a corner portion provided between the sidewall and the diaphragm, the corner portion being rounded and having a radius of curvature R, wherein: the radius of curvature R of the corner portion satisfies a formula of; R/S=526Â·(d/S)2âˆ’0.037Â·(d/S)+a1 where S is an area of the diaphragm, d is a thickness of the diaphragm, 526 and 0.037 are proportional constants and a1 is a correction value that is in a range of 9.6Ã—10âˆ’7 to 16Ã—10âˆ’7 inclusive.