Patent ID: 8268660

Claim:
A method for manufacturing a micromachine, comprising the steps of: providing a substrate; forming an insulating layer on the substrate; forming a lower wire on the insulating layer; forming a first sacrifice layer comprising silicon dioxide on a top surface of the lower wire; forming an oscillator on a portion of the first sacrifice layer; forming a second sacrifice layer on top and side surfaces of the oscillator so that a movable portion of the oscillator is covered with the second sacrifice layer, the second sacrifice layer comprising silicon dioxide, and in cross-section, the movable portion of the oscillator is surrounded by the first and second sacrifice layers; covering exposed portions of the first and second sacrifice layers with an overcoat film; forming first and second penetrating holes in the overcoat film respectively on both sides of the oscillator, the first and second penetrating holes extending through the overcoat film to reach the first sacrificial layer on the both sides of the oscillator, performing sacrifice-layer etching using the first and second penetrating holes to remove the first and second sacrifice layers so as to form a space around the movable portion of the oscillator; and following the sacrifice-layer etching, performing a film-formation treatment by sputtering at a reduced pressure so as to form a sputtering layer that seals the first and second penetrating holes and that is formed into at least one upper wire over the overcoat film, wherein, the sputtering layer is composed of one selected from the group consisting of an aluminum copper film and an aluminum silicon film.