Patent ID: 6363791
Filing Date: 2002-04-02
Classification: G01L

Abstract:
A semiconductor pressure sensor, comprising:a first substrate having a surface; a second substrate having a diaphragm and a thick part surrounding the diaphragm and forming a wall around said diaphragm, said diaphragm connected to said thick part and spanning over a region defined by said wall, wherein at least one surface of said wall bonds said second substrate to said first substrate; a first electrode disposed on the surface of the first substrate opposite the diaphragm; a second electrode on the diaphragm opposite the first electrode; an insulating layer covering the first electrode and said first substrate opposite the diaphragm, said insulating layer separating said first electrode and said second electrode; wiring on the surface of said first substrate in a region between the first and second substrates and extending between the first electrode and an external electrode; and a plurality of additional wiring portions intersecting the wiring, the additional wiring portions being connected to the outside of the wiring on the surface of the first substrate in a region between the first and second substrates, and projecting along the surface of the first substrate from the wiring in a direction which is not parallel to the direction of the wiring, wherein capacitance between the first and second electrodes changes in response to a deflection of the diaphragm resulting from pressure whereby pressure is detected.