Measuring and testing – Speed – velocity – or acceleration – Acceleration determination utilizing inertial element
Reexamination Certificate
2007-01-17
2008-11-04
Kwok, Helen C. (Department: 2856)
Measuring and testing
Speed, velocity, or acceleration
Acceleration determination utilizing inertial element
Reexamination Certificate
active
07444871
ABSTRACT:
An acceleration sensor includes a pair of permanent magnets, each having a surface facing a magnetic field detection sensor, arranged in parallel so that the surfaces of the pair of permanent magnets have different magnetic polarities with each other, a spring member for supporting the pair of permanent magnets to displace the pair of permanent magnets when an external force is applied, and a magnetic field detection sensor mounted in stationary state to face the pair of permanent magnets. The magnetic field detection sensor has at least one pair of multi-layered MR elements, each including a magnetization fixed layer and a magnetization free layer, the magnetization fixed layer being magnetized in a direction parallel to a displacement detection direction. The pair of permanent magnets are arranged so that a longitudinal direction of each permanent magnet is in parallel with the magnetized direction of the magnetization fixed layer.
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Kwok Helen C.
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
TDK Corporation
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