Patent ID: 11137307

Abstract:
A sensor chip (24) is joined to an inner wall surface (20a) of a base body (21-1), with a lower surface (24a) of a first retaining member (24-2) serving as a joint surface, in such a manner as to allow an enclosing chamber (23) (including a pressure receiving chamber (23-1) and a pressure guiding passage (23-2)) between a pressure receiving diaphragm (22) and the joint surface (24a) of the sensor chip (24) to communicate with a pressure guiding hole (24-2b) in the first retaining member (24-2). In this state, a narrow tube (31) made of stainless steel is passed through the pressure guiding passage (23-2) in the base body (21-1) and inserted and secured in the pressure guiding hole (24-2b) in the first retaining member (24-2). This reduces the pressure receiving area of a pressure guiding passage that guides a pressure (P1) of a measured fluid to a first surface (24-1a) of a sensor diaphragm (24-1), suppresses force applied in the direction of separating the joint between the sensor chip (24) and the base body (21-1), and makes it possible to use a soft adhesive.