Patent ID: 6909158

Claim:
A capacitance type dynamical quantity sensor comprising: a semiconductor substrate; a weight portion being displaced in accordance with a dynamical quantity applied to the weight portion, and supported with the substrate; a movable electrode integrated with the weight portion; and a fixed electrode facing the movable electrode and cantilevered with the substrate, wherein the movable electrode and the fixed electrode provide a capacitor having a capacitance, wherein the movable electrode is movable together with the weight portion in accordance with the dynamical quantity in a perpendicularly direction perpendicular to a facing surface of the movable electrode, the facing surface facing the fixed electrode, wherein the capacitance of the capacitor is changed in accordance with a displacement of the movable electrode so that a capacitance change is detected by an outer circuit, and wherein the facing surface of the movable electrode has a substantially rectangular shape, and an aspect ratio of the facing surface is in a range between 0.1 and 10.