Patent ID: 8043882
Filing Date: 2011-10-25
Classification: B81B,B81C,G02B,Y10T

Abstract:
1. A method of making a microminiature moving device, the method comprising: sandwiching an insulating layer between a surface of a single-crystal silicon substrate and a first surface of a single-crystal silicon layer; forming on a second surface of the silicon layer that is opposite the first surface: selectively gas-reactive dry etching the silicon layer vertically at portions exposed through the stationary-part masks and the movable-element masks to expose portions of the insulating layer and form sidewalls of the silicon layer; covering the sidewalls with sidewall protective films; etching the exposed portions of the insulating layer to expose portions of the surface of the substrate, thereby: isotropically etching the exposed portions of the surface of the substrate until regions of the surface of the substrate under the movable elements are etched away, thereby: removing the stationary-part masks and the movable-element masks and the sidewall protective films; and removing the insulating layer under the movable elements and under the overhanging portions and portions adjacent to the overhanging portions of the stationary parts so that the insulating layer is indented from the overhanging portions of the stationary parts and edges of the depressions at the surface of the substrate.