Patent ID: 7679865
Filing Date: 2010-03-16
Classification: G01P,G11B

Abstract:
1. A spring member for an acceleration sensor, comprising: a first movable section having a plane plate shape, for fixing a first magnetic field generation member with weight used for detecting acceleration in a direction of a Z-axis that is perpendicular to an X-Y plane; a single first support arm section having a strip shape parallel to a plane of said first movable section when no acceleration is applied, one end of said single support arm section being integrally connected to one end of said first movable section and the other end of said single first support arm section being fixed; at least two second support arm sections each having a strip shape parallel to said X-Y plane when no acceleration is applied, said at least two second support arm sections freely moving in an X-axis direction and a Y-axis direction and capable of twisting; and a second movable section having a plane plate shape parallel to said at least two second support arm sections when no acceleration is applied, for fixing a second magnetic field generation member with weight used for detecting accelerations in directions of the X-axis and the Y-axis, said second movable section being supported by said at least two second support arm sections, said first movable section being supported only by said single first support arm section in a cantilever configuration, said first movable section, said first support arm section, said second movable section and said at least two second support arm sections being integrally formed.