Patent ID: 7543498

Claim:
A spring member used in an acceleration sensor for supporting weights that cooperate as magnetic field generation members to generate a magnetic field to be detected by magnetic field detection members or the magnetic field detection members to detect the magnetic field generated by the magnetic field generation members, said spring member comprising: a first strip-shaped plate spring with a fulcrum at a center of the first strip-shaped plate spring; and two second strip-shaped plate springs with centers connected to both ends of said first strip-shaped plate spring, respectively, wherein each of the second strip-shaped plate springs includes support sections at both ends of the second strip-shaped plate spring for supporting said weights, said first strip-shaped plate spring is configured to produce a bending stress or twisting stress in response to an applied external force so as to displace said weights, and the two second strip-shaped plate springs are configured to produce bending stresses in response to the applied external force so as to displace said weights.