Patent ID: 6841840

Claim:
A capacitive dynamic quantity sensor comprising: a substrate; a weight, which is displaced by a dynamic quantity; a movable electrode, which is integrated with the weight; a first movable unit anchor, which is fixed to the substrate to suspend the weight and the movable electrode above the substrate; a fixed electrode, which is arranged to face the movable electrode, wherein a displacement of the movable electrode that is caused in response to the dynamic quantity is detected as a variation in a capacitance between the movable electrode and the fixed electrode; a first spring, which is located between the first movable unit anchor and the weight and resiliently deforms in response to the dynamic quantity such that the movable electrode is displaced by a distance corresponding to the dynamic quantity; and a first strain buffer, which is located between the first movable unit anchor and the first spring to reduce an influence of a strain generated in the substrate on the first spring.