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Analysis Device and Analysis System

a technology of analysis device and analysis system, which is applied in the field of analysis can solve the problems of inability to accurately calculate the angle of the spin axis of the ball with a gyroscope sensor, and the small size of the gyroscope sensor that is built into the ball can only measure a limited range, so as to achieve the effect of more accurate calculation of the angle of the spin axis of the ball

Inactive Publication Date: 2019-11-07
MIZUNO CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides an analysis device and system that can accurately calculate the angle of a spinning object's axis.

Problems solved by technology

However, since a gyroscope sensor is generally large in size, a gyroscope sensor that is small enough to be built in a ball can measure only a limited range.
Accordingly, when a thrown ball rotates at a high speed, such as in baseball, the angle of the spin axis of the ball may not be calculated accurately with a gyroscope sensor due to saturation.

Method used

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  • Analysis Device and Analysis System
  • Analysis Device and Analysis System

Examples

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embodiment 1

[0030]FIG. 1 is a view for explaining a general configuration of an analysis system 1000 according to embodiment 1. With reference to FIG. 1, analysis system 1000 is a system for analyzing the spin axis of a baseball thrown by a subject 5 (pitcher), and displaying the results of the analysis. Analysis system 1000 includes an analysis device 10, and a ball 2 including a built-in sensor device 20. In FIG. 1, three axes orthogonal to one another in the sensor coordinate system are represented by an x-axis, a y-axis, and a z-axis; and three axes orthogonal to one another in the absolute coordinate system are represented by an X-axis, a Y-axis, and a Z-axis.

[0031]Analysis device 10 is a smartphone. However, analysis device 10 may be implemented as any type of device. For example, analysis device 10 may be a laptop personal computer (PC), a tablet-type device, a desktop PC, or the like.

[0032]Analysis device 10 communicates with sensor device 20 by a wireless communication system. As the w...

embodiment 2

[0112]Embodiment 1 describes a configuration in which the angle of the spin axis is calculated using geomagnetic data. Embodiment 2 describes a configuration in which the angle of the spin axis is calculated using acceleration data. The and of embodiment 2 are the same as those of embodiment 1, and thus the detailed explanation thereof is not repeated.

[0113]FIG. 9 is a flowchart for explaining the operation of analysis device 10 according to embodiment 2. The steps below are implemented typically by CPU 102 of analysis device 10 according to embodiment 2 executing a program stored in memory 104.

[0114]With reference to FIG. 9, the processes in step S12 to step S32 are as described with reference to FIG. 5. However, FIG. 9 does not include step S10 of FIG. 5. This is because, in embodiment 2, acceleration data is used to calculate the angle of the spin axis and thus no calibration of geomagnetic sensor 208 will not significantly affect the accuracy of the angle of the spin axis. How...

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Abstract

An analysis device for analyzing a spin axis of a ball receives an input of acceleration data and geomagnetic data detected on a time-series basis by a sensor device built in the ball; calculates attitude information of the ball, based on the acceleration data and the geomagnetic data; calculates the spin rate of the ball released from a subject, based on the geomagnetic data; and calculates an angle of the spin axis of the ball relative to a predetermined direction, using a predetermined filter and based on the attitude information, the spin rate, the geomagnetic data, and a first-order differential value and a second-order differential value of the geomagnetic data.

Description

BACKGROUND OF THE INVENTIONField of the Invention[0001]The present disclosure relates to a technique for analyzing the spin axis of a ball.Description of the Background Art[0002]In recent years, a method has been known by which to measure spin parameters of a thrown baseball, such as the movement locus, the spin rate, and the spin axis direction, by using information from a sensor built in the ball. For example, Japanese Patent Laying-Open No. 2018-134153 discloses a throw analysis system.[0003]The throw analysis system according to Japanese Patent Laying-Open No. 2018-134153 includes a ball having a sensor unit and a transmitting unit that are built in the ball, and an analysis device to receive the detection value of the sensor unit transmitted from the transmitting unit and analyze the detection value. The sensor unit includes a substrate; and an acceleration sensor, a geomagnetic sensor, and a gyroscope sensor mounted on the substrate. The analysis device identifies and stores t...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A63B24/00
CPCA63B24/0021A63B2024/0034A63B2220/833A63B2220/40A63B2220/16A63B2102/18A63B2220/808A63B2220/803A63B2102/182A63B71/0622A63B2209/00A63B2071/0625A63B2220/62A63B24/0003A63B2225/02A63B2225/50A63B2220/89A63B2220/35A63B69/0002A63B2069/0006A63B43/004
Inventor SHIBATA, SHOHEINARUO, TAKESHIKASE, YUTOHIROSE, KIYOSHI
Owner MIZUNO CORPORATION