Patent ID: 6946398

Claim:
A method for fabricating a micro machine comprising the steps of: implanting oxygen ions into a first region of a first semiconductor substrate, and performing thermal processing to form an oxide film buried in the first semiconductor substrate, spaced from the surface of the first semiconductor substrate; bonding the surface of the first semiconductor substrate with the oxide film buried in to a second semiconductor substrate with an insulation film therebetween; forming a first mask with an opening in the first region and a second region on both sides of the first region on the surface of the first semiconductor substrate, which is opposite to the surface with the oxide film buried in; etching the first semiconductor substrate with the first mask and the oxide film as a mask to form a spring portion integral with the first semiconductor substrate between the oxide film and the insulation film to thereby form a torsion bar including the spring portion; forming a second mask with an opening in the first region and the second region on the surface of the second semiconductor substrate, which is opposite to the surface bonded to the first semiconductor substrate; etching the second semiconductor substrate with the second mask as a mask; and etching the insulation film in the first region and the second region.