Patent ID: 6876093

Claim:
A capacitance type dynamic quantity sensor device comprising: a sensor chip having movable electrodes which can be displaced in predetermined directions in accordance with an applied dynamic quantity, and sensor-chip side fixed electrodes disposed so as to confront the movable electrodes in a horizontal direction to a surface of a substrate of the sensor chip, wherein the movable electrodes and the sensor-chip side electrodes are disposed on one surface side of the substrate; and a circuit chip for processing an output signal from the sensor chip, wherein the movable electrodes are joined to the substrate through spring portions having degrees of freedom in both a horizontal direction to a surface of the substrate and a vertical direction to the surface of the substrate, wherein the movable electrodes are displaceable in the horizontal direction to the surface of the substrate and the vertical direction to the surface of the substrate which correspond to the predetermined direction, wherein one surface of the substrate of the sensor chip and the circuit chip are disposed to confront each other, wherein a circuit-chip side fixed electrode is equipped at a site corresponding to the movable electrodes on a confronting surface of the circuit chip to the substrate, wherein the sensor chip and the circuit chip are electrically connected to each other through bump electrodes, and wherein the dynamic quantity is detected on the basis of a capacitance variation between the movable electrodes and the sensor-chip side fixed electrode and a capacitance variation between the movable electrodes and the circuit-chip side fixed electrode caused by application of the dynamic quantity.