Patent ID: 8220338

Claim:
A pressure sensor comprising: a semiconductor substrate comprising a diaphragm portion; and a glass pedestal provided on a bottom side of the semiconductor substrate; wherein the bottom surface of the semiconductor substrate is bonded to a top surface of the glass pedestal; a pressure introducing hole is formed in the glass pedestal so as to pass through the glass pedestal between the top surface and a bottom surface of the glass pedestal; wherein the pressure introducing hole is formed with a first diameter for the pressure introducing hole at the bottom surface of the glass pedestal from the bottom surface of the glass pedestal to a first position, and a second diameter for the pressure introducing hole at the top surface of the glass pedestal is larger than the first diameter; a metal thin film layer formed on the bottom surface of the glass pedestal; and a metal base having a top surface thereof bonded by solder to the bottom surface of the glass pedestal with the metal thin film layer interposed therebetween, wherein a through hole portion formed in the metal base so as to pass through the metal base between the top surface and a bottom surface of the metal base and so as to connect to the pressure introducing hole of the glass pedestal; wherein a diameter of the through hole portion is larger than the first diameter of the pressure introducing hole; and wherein a solder fillet is formed at a step part between the through hole in the metal thin film layer and the through hole portion of the metal base.