Patent ID: 7930943
Filing Date: 2011-04-26
Classification: G01L

Abstract:
1. A differential pressure sensor, comprising: a housing comprising a first wall which defines a first chamber and a second wall which defines a second chamber; a diaphragm disposed within said housing between said first chamber and said second chamber, and comprising a movable part which can be moved along a certain shift axis (X) upon receipt of a pressure difference between said first chamber and said second chamber; an elastic reaction member which applies an elastic reaction force to said movable part; and a transducer which outputs an electrical signal according to a position of said movable part along said shift axis; wherein: said elastic reaction member comprises: a contact portion which contacts said movable part and is shiftable together with said movable part; and a plate shaped or linear spring comprising a loose end which is connected to said contact portion, and a fixed end which is connected to said housing; said spring comprises a first spring portion and a second spring portion which are connected in series between said loose end and said fixed end, with said first spring portion extending in a first direction from said loose end to a mutual connection point between said first spring portion and said second spring portion, and said second spring portion extending in a second direction from said mutual connection point to said fixed end; and said first spring portion and said second spring portion are disposed so that said first direction and said second direction mutually subtend an obtuse angle upon a two dimensional coordinate plane (Y-Z) which is orthogonal to said shift axis; and a length of said second spring portion is greater than a length of said first spring portion.