Patent ID: 7371600

Claim:
A manufacturing method of an acceleration sensor comprising: forming a fixed electrode and a beam on a sensor substrate, and a movable electrode suspended by said beam movable above said sensor substrate with a restoring force, wherein said fixed electrode and said movable electrode are configured to detect an acceleration based upon a capacity change therebetween, and said forming includes; forming a sacrifice on said sensor substrate; depositing with doping on said sacrifice film a plurality of semiconductor layers having different impurities and different sizes, at least one layer of said semiconductor layers being deposited while being doped, and a cross-section shape of a side end face of said plurality of semiconductor layers has an irregular shape along a direction perpendicular on said plurality of semiconductor layers, the irregular shape comprising a narrow portion disposed between wider portions; removing said sacrifice film for said movable electrode to have a predetermined gap from said sensor substrate; patterning the plurality of semiconductor layers; and lamp annealing said movable electrode, said fixed electrode, and said beam.