Patent ID: 9651441
Date: 2017-05-16
CPC Classifications: B81B,B81C,G01L,H01L

Claim:
1. A pressure sensing element comprising: a first substrate having top and bottom opposing sides; a diaphragm formed into the bottom of the first substrate, the diaphragm having top and bottom opposing sides, the top side of the diaphragm comprising spaced-apart piezoresistors coupled to each other to form a Wheatstone bridge; a rim, which is formed as part of the bottom of the diaphragm and which supports and stiffens a perimeter region of the bottom of the diaphragm; and a cross-stiffener, formed as part of the diaphragm on the bottom side of the diaphragm whereby the rim and the cross-stiffener improve the diaphragm's accuracy.