Patent ID: 8567256
Filing Date: 2013-10-29
Classification: G01L,H01L

Abstract:
1. A pressure sensor comprising: a piezoresistive sensor chip element having a closed chip cavity for measuring the pressure of a pressure medium flowing around the chip element, the chip element having an element lower face, and a substrate having a substrate upper face, to which the sensor chip element is fastened at the lower face thereof, wherein said lower face includes an adhesion area and has an outer edge, and wherein the lower face adheres to the substrate upper face in the adhesion area, wherein the lower face has a non-adhesion area that does not adhere to the substrate upper face and wherein the non-adhesion area extends at least over a circular area located centrally on the lower face, which circular area occupies a third of the total surface area of the element lower face, and wherein the non-adhesion area comprises at least one communicating area from the circular area to the edge of the lower face, so that the pressure in the pressure medium is able to spread through the communicating area into a space below the non-adhesion area on the element lower face, wherein the substrate has a recess located centrally below the sensor chip element.