Patent ID: 6171881
Filing Date: 2001-01-09
Classification: G01P

Abstract:
A process for producing an acceleration sensor, comprising:a first step of forming, on a main surface of a first single crystal silicon substrate, a groove of a predetermined depth at an area surrounding a beam to be formed;a second step of depositing, on the main surface of said first single crystal silicon substrate, a film of a polycrystalline silicon, amorphous silicon or mixture thereof, so as to fill said groove with said silicon film, and smoothing the surface of said silicon film;a third step of bonding the main surface of said first single crystal silicon substrate to the second single crystal silicon substrate with an insulating film interposed therebetween;a fourth step of polishing a surface of said first single crystal silicon substrate on the side opposite to the surface thereof bonded to the second single crystal silicon substrate to a predetermined degree, so as to make the first single crystal silicon substrate a thin film; anda fifth step of exposing said film of polycrystalline silicon, amorphous silicon or a mixture thereof on said polished surface of the first single crystal silicon substrate at an area corresponding to the position where said groove is formed, and removing said silicon film by etching from said exposed area, so as to make the beam movable.