Patent ID: 6984541

Claim:
A method of manufacturing a capacitive type dynamic quantity sensor, wherein the capacitive type dynamic quantity sensor has a beam portion with a beam for deforming in a predetermined deformation direction based on physical force application, a movable electrode formed integrally with the beam portion to move therewith extending in a direction perpendicular to the predetermined deformation direction, and a fixed electrode facing and being separated from the movable electrode, wherein the method comprises forming a trench in a substrate to form the beam portion, the movable electrode and the fixed electrode simultaneously, wherein: the forming of the trench forms the beam such that the beam extends in the direction perpendicular to the predetermined deformation direction and such that a width of the beam extends in the predetermined deformation direction, and the forming of the trench forms a gap disposed between the movable electrode and the fixed electrode, the gap having a width in the predetermined deformation direction that is approximately identical to the beam width; respective widths of the movable electrode, the fixed electrode and the gap are approximately identical; and the beam of the beam portion includes two beam parts each having a width that is approximately the same as the width of the gap.