Patent ID: 7494594
Filing Date: 2009-02-24
Classification: H02N

Abstract:
1. A method for manufacturing an electrostatic actuator comprised of a laminate substrate including a thin film silicon layer formed on a silicon substrate through a buried insulating film, a movable structure including a torsion beam and a movable side comb-tooth electrode, and a fixed side comb-tooth electrode disposed to face the movable side comb-tooth electrode, wherein the movable structure is constructed with the thin film silicon layer, wherein a potential difference is generated between the electrodes to swing the movable structure, the method comprising: disposing the laminate substrate on a support substrate; forming a through hole deeper than the movable structure, wherein the through hole is bored through the laminate substrate in a formation area of the fixed side comb-tooth electrode in the laminate substrate; filling the through hole with a conductive material to form the fixed side comb-tooth electrode; removing the thin film silicon layer and the buried insulating film around a formation area of the movable structure in the laminate substrate by trench etching; and removing the silicon substrate in the formation area of the movable structure by etching.