AN IMPROVED PRESSURE SENSOR
    29.
    发明授权

    公开(公告)号:EP3004828B1

    公开(公告)日:2018-08-29

    申请号:EP14728351.9

    申请日:2014-05-27

    发明人: KUISMA, Heikki

    IPC分类号: G01L19/04

    摘要: A microelectromechanical pressure sensor structure comprises a planar base, side walls and a diaphragm plate, attached to each other to form a hermetically closed gap that provides a reference pressure. The diaphragm plate extends along a planar inner surface on top of the side walls, and has an outer surface on the opposite side of the diaphragm plate. At least part of the outer surface of the diaphragm plate forms a planar part that includes a recess, a depth of which extends parallel to the side walls and is less than the nominal thickness of the diaphragm. A large part of reasons causing the different bending of the diaphragm and the underlying structures can be eliminated with one or more recesses arranged to the pressure sensor structure.