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US Patent 7574914 Acceleration sensor

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Patent Jurisdiction
United States Patent and Trademark Office
United States Patent and Trademark Office
Patent Number
7574914
Patent Inventor Names
Yoichi Mochida1
Date of Patent
August 18, 2009
Patent Application Number
12325383
Date Filed
December 1, 2008
Patent Primary Examiner
Hezron Williams
Hezron Williams
Patent abstract

An acceleration sensor includes a frame-shaped beam portion disposed above an XY substrate surface of a base in a floating state and a beam-portion supporting/fixing unit arranged to attach the beam portion to the base with support portions so as to be supported on two sides. The acceleration sensor also includes weight portions disposed above the XY substrate surface of the base in a floating state and connecting portions for attaching the weight portions to the beam portion in a cantilever state. The weight portions are movable in three axial directions including an X-axis direction, a Y-axis direction, and a Z-axis direction when the beam portion is deflected. The beam portion is provided with an X-axis-direction acceleration detection unit arranged to detect an acceleration in the X-axis direction, a Y-axis-direction acceleration detection unit arranged to detect an acceleration in the Y-axis direction, and a Z-axis-direction acceleration detection unit arranged to detect an acceleration in the Z-axis direction. The Z-axis-direction acceleration detection unit is disposed near proximal ends of Y-axis-direction extending portions of the beam portion, and the Y-axis-direction acceleration detection unit is disposed near distal ends of the Y-axis-direction extending portions.

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