Patent ID: 8022806
Filing Date: 2011-09-20
Classification: G01L

Abstract:
1. A fluid pressure sensor package comprising: a sealed casing; a sensor chip accommodated in said casing for sensing a pressure of a fluid introduced into said casing, said sensor chip being formed of a semiconductor substrate to give a diaphragm and a sensing element; a probe tube extending from said casing and having a fluid channel for introducing the fluid into contact with said diaphragm; wherein said casing is formed to have a bottom wall and a side wall which extends from the circumference of said bottom wall to define a top opening at an upper end of said casing, said side wall being formed on its interior surface with a stepped shoulder, and said probe tube is formed at its one end with a flange which is fitted within said top opening of the casing and rests on said stepped shoulder, said flange being sealingly bonded to the side wall of the casing by a sealer, and wherein said sensor chip is bonded to the bottom wall of said casing by means of an adhesive, said bottom wall is formed with an air vent which communicates the diaphragm with an outside atmosphere for releasing a back pressure of the diaphragm, and said bottom wall is formed on its interior surface with a rim surrounding said air vent to define a space therearound for receiving therein said adhesive.