Patent ID: 6212955
Filing Date: 2001-04-10
Classification: G01L

Abstract:
A capacitance-type pressure sensor unit comprising:a capacitance-type pressure sensor element including a first insulating substrate which is made of an insulating material and has a front surface provided thereon with a first capacitance detecting electrode pattern and a rear surface constituting a pressure sensing surface and a second insulating substrate which is made of an insulating material and fixed with respect to said first insulating substrate and has a rear surface provided thereon with a second capacitance detecting electrode pattern in a manner to be opposite to said first capacitance detecting electrode pattern while being spaced at an interval therefrom;a receiving casing made of metal and including a cylindrical casing body provided at one end thereof with an opening and at the other end thereof with a bottom wall section, said bottom wall section being provided with a fluid inlet port through which a pressure measured fluid is introduced into said receiving casing;a circuit board including a board member provided thereon with circuit patterns and mounted thereon with at least a part of a plurality of electric circuit components constituting a signal processing circuit for processing an output of said pressure sensor element; anda connector including a connector body which is made of an insulating material and includes a base formed on one surface thereof with an opening and provided therein with a circuit component receiving chamber for receiving said circuit board therein in a manner to communicate with said opening of said connector body;said connector also including a plurality of connection conductors fixed in said connector body and each having one end extending into said circuit component receiving chamber and electrically connected to each of said circuit patterns on said circuit board and an other end externally exposed;said circuit board having a component mounting surface arranged so as to extend along a front surface of said second insulating substrate of said pressure sensor element;said pressure sensor element being received in said casing body of said receiving casing while keeping said pressure sensing surface facing said bottom wall section of said casing body;said connector body being received in said casing body of said receiving casing in such a manner that said base of said connector body is positioned on a side of said opening of said receiving casing rather than on a side of said pressure sensor element;said receiving casing being securely mounted at an end thereof positioned on a side of said opening of said connector body on said base of said connector body by caulking;said pressure sensor element and said circuit patterns on said circuit board being electrically connected to each other through a plurality of metal terminal fitments;said circuit board being supported by at least one of said connection conductors of said connector and said metal terminal fitments.