Sensor, and method for measuring physical quantity by use of...

Details Sensor, and method for measuring physical quantity by use of... Sensor, and method for measuring physical quantity by use of...

2005-09-28

2008-10-28

Whittington, Kenneth J (Department: 2862)

Electricity: measuring and testing

Magnetic

Displacement

C324S260000, C073S514310

Reexamination Certificate

active

07443158

ABSTRACT:
A sensor includes a first X-axis GMR element to a fourth X-axis GMR element fixed on a substrate, and a movable coil movably supported on the substrate. When electric current flows through the movable coil, a magnetic field is generated around the movable coil. The generated magnetic field is applied to the first to fourth X-axis GMR elements. The movable coil moves in accordance with acceleration generated in the sensor. The movement of the movable coil causes variation in the magnetic field applied to the first to fourth X-axis GMR element. While no electric current flows to the movable coil, the sensor measures an external magnetic field on the basis of resistances of the first to fourth X-axis GMR elements. While constant electric current flows through the movable coil, the sensor measures acceleration or the like on the basis of resistances of the first to fourth X-axis GMR elements.

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patent: 2002/0017134 (2002-02-01), Sakurai et al.
patent: 2003-172633 (2003-06-01), None

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