Patent ID: 6858457

Claim:
A method of manufacturing an acceleration sensor comprising the steps of: (a) preparing first and second insulating substrates and a non-insulating substrate; (b) joining said first insulating substrate and said non-insulating substrate and forming a movable electrode and a fixed electrode in said non-insulating substrate by using a photolithographic technique and an anisotropic etching technique; (c) forming, on a surface of said second insulating substrate, a second film for causing an eutectic reaction with said non-insulating substrate when it is heat treated at a predetermined temperature; and (d) carrying out a heat treatment at said predetermined temperature without causing said movable electrode to come in contact with said second film and joining, through said second film, said second insulating substrate on a surface of said non-insulating substrate which is opposite to a surface where said first insulating substrate is joined.