BALL ROTATIONAL DIRECTION DETECTING SYSTEM
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United States of America Patent
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Issued Date -
Sep 14, 2017
app pub date -
Nov 3, 2016
filing date -
Nov 10, 2015
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Abstract
A ball rotational direction detecting system includes a magnetic sensor that is fixed in a ball, an acceleration sensor, a bearing recording unit that records a moving bearing, a magnetic dip recording unit that records a magnetic dip α of geomagnetism, and a calculating unit. The calculating unit calculates the orientation of the rotation axis and the rotational direction of the ball with respect to a traveling direction F and a gravity direction G of the ball, based on a geomagnetism vector m, an acceleration vector a, the moving bearing, the magnetic dip α, and time variations in the geomagnetism vector m or the acceleration vector a.
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