Ball rotational direction detecting system
AssigneeAichi Steel Corporation
InventorMichiharu YAMAMOTO
Life of this patent
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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.
Claims13
A ball rotational direction detecting system that detects an orientation of a rotation axis and a rotational direction of a ball moving in midair with respect to a traveling direction and a gravity direction of the ball, the ball rotational direction detecting system comprising:
- a magnetic sensor that detects a geomagnetism vector in a ball coordinate system, which is a three-axis orthogonal coordinate system fixed in the ball;
- an acceleration sensor that detects an acceleration vector in the ball coordinate system;
- a bearing recording unit that records a moving bearing, the moving bearing being a bearing in which the ball moves;
- a magnetic dip recording unit that records a magnetic dip of geomagnetism;
- and
- a calculating unit that calculates an orientation of the rotation axis and a rotational direction of the ball with respect to the traveling direction and the gravity direction based on the geomagnetism vector, the acceleration vector, the moving bearing, the magnetic dip, and a time variation in the geomagnetism vector or the acceleration vector.
Dependencies are inferred from the claim text.