Patent ID: 8659101

Claim:
An inertia sensor comprising: a packaging member; a first semiconductor chip having a substrate and a detecting unit of the sensor comprising weights displaceable relative to the substrate and detecting electrodes for converting displacements of the weights to electric signals, the detecting unit of the sensor being mounted on the substrate; a second semiconductor chip mounted on the packaging member so as to perform arithmetic operations based on the electric signals; and a vibration-proof structure having a first vibration-proof part and a second vibration-proof part made of material having a larger Young's modulus than the first vibration-proof part, the vibration-proof structure being disposed between the first semiconductor chip and the second semiconductor chip, wherein a periphery of the first vibration-proof part is surrounded by the second vibration-proof part or a combination of the second vibration-proof part and the packaging member; and wherein one portion of the periphery of the first vibration-proof part is in contact with the packaging member while another portion of the periphery of the first vibration-proof part is surrounded by the second vibration-proof part.