Patent ID: 6971268

Claim:
A pressure sensor comprising: a diaphragm for sealing liquid, wherein the diaphragm includes a plurality of convexities, which are disposed concentrically on the diaphragm, wherein each convexity has a circular arc cross section in a radial direction and has a ring shape, wherein each convexity has a length of the circular arc representing as L, a height of the convexity representing as H, a width of the convexity in the radial direction representing as W, and a pitch between two adjacent convexities in the radial direction representing as P, wherein the diaphragm has an effective radius representing as R, and a distance between a center of the diaphragm and a center of the convexity disposed utmost outside of the diaphragm representing as r 0 , the effective radius of the diaphragm being defined as a radius of a part of the diaphragm applied with pressure, wherein the sensor has a configuration factor representing as α, which is defined as: α = ( L H ) × ( L W ) P × ( r0 R ) , and wherein the configuration factor is in a range between 2.5 and 3.5.