Patent ID: 7631559

Claim:
An acceleration sensor, comprising: a base having an XY-substrate surface substantially parallel to an XY flat surface and including an X-axis, a Y-axis, and a Z-axis, all of which being perpendicular to one another; a beam portion having a frame shape arranged in a floating state above the XY-substrate surface of the base; a beam supporting fixed portion arranged to support the beam portion on the base via supporting portions having an elongated shape disposed on both sides of the beam portion, each facing outwards along the X-axis direction; a connecting portion having an elongated shape facing outwards along the Y-axis direction from each of two sides of the Y-axis direction of the beam portion in a state of floating above the XY-substrate surface of the base; and a weight portion connected to a tip portion of each connection portion; wherein the weight portion is arranged to be displaced in each of the X-axis direction, the Y-axis direction, and the Z-axis direction by bending deformation of the frame-shaped beam portion; and the beam portion comprises an X-axis direction acceleration detecting portion arranged to detect acceleration in the X-axis direction based on the bending deformation of the beam portion originating in the X-axis direction displacement of the weight portion, a Y-axis direction acceleration detecting portion arranged to detect acceleration in the Y-axis direction based on the bending deformation of the beam portion originating in the Y-axis direction displacement of the weight portion, and a Z-axis direction acceleration detecting portion arranged to detect acceleration in the Z-axis direction based on the bending deformation of the beam portion originating in the Z-axis direction displacement of the weight portion.