Motion analysis device and motion analysis system

• US 9,864,904 B2
• Filed: 02/12/2015
• Issued: 01/09/2018
• Est. Priority Date: 02/21/2014
• Status: Active Grant

• Current Assignee: Seiko Epson Corporation (Seiko Group)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: Saiki, Kenji
• Primary Examiner(s): Nicely, Joseph C
• Application Number:
  US14/620,891
• Publication Number:
  US 20150238813A1
• Time in Patent Office: 1,062 Days
• CPC Class Codes: A63B 24/0003 Analysing the course of a movement or motion sequences during an exercise or trainings sequence, e.g. swing for golf or tennis
• CPC Class Codes: G01P 15/00 Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
• CPC Class Codes: G01P 15/02 by making use of inertia forces using solid seismic massesG01P15/14 takes precedence
• CPC Class Codes: G01P 15/14 by making use of gyroscopes gyroscopes per se G01C19/00
• CPC Class Codes: G01P 15/18 in two or more dimensions
• CPC Class Codes: G06F 18/00 Pattern recognition
• CPC Class Codes: G06F 2218/00 Aspects of pattern recognition specially adapted for signal processing
• CPC Class Codes: G06V 40/23 Recognition of whole body movements, e.g. for sport training

Abstract

An motion analysis device includes a processing unit that performs motion analysis of a subject using an output of a sensor unit. The sensor unit includes an angular velocity sensor capable of measuring angular velocity of at least 2500 dps, a second acceleration sensor capable of measuring acceleration of at least 50 G, and a first acceleration sensor capable of measuring acceleration of at least 24 G. The sensor unit is mounted on at least one of a golf club and a subject. The processing unit calculates a posture of the sensor unit at the time of motion using the angular velocity measured by the angular velocity sensor, and performs selection of outputs of the second and first acceleration sensors according to acceleration applied at the time of the motion and calculates a position of the sensor unit during the motion using the selected acceleration of the sensor.

Claims

1. An motion analysis device comprising:

a first sensor that is able to measure angular velocity of at least 2500 dps;

a second sensor that is able to measure acceleration of at least 50 G;

a third sensor that is able to measure acceleration of at least 24 G, the third sensor having a lower measurement range than the second sensor; and

a processing unit that performs motion analysis for a subject using an output of a sensor unit comprising the first sensor, the second sensor and the third sensor and mounted on at least one of a golf dub and the subject operating the golf club,

wherein the processing unit calculates a posture of the sensor unit at a time of motion using the angular velocity measured by the first sensor, and performs selection of outputs of the second and third sensors according to acceleration applied at the time of the motion and calculates a position of the sensor unit during the motion using the selected acceleration of the sensor, the output of the third sensor being selected at a first threshold during the operation of the golf club and the output of the second sensor being selected at a second threshold during the operation of the golf club different from the first threshold, so as to allow for the position of the sensor unit to be determined.

2. The motion analysis device according to claim 1,

wherein the first sensor is able to measure angular velocity of rotation of a plurality of axes, and

wherein the processing unit calculates a timing of ball hitting from a norm of the angular velocity generated at the rotation of each axis.

3. The motion analysis device according to claim 1, wherein the processing unit performs calculation using the acceleration measured by the third sensor at a time of start of the motion and performs calculation using the acceleration measured by the second sensor when acceleration applied during the motion exceeds a threshold value set in advance.

4. The motion analysis device according to claim 1, wherein the first sensor is able to measure angular velocity of at least 3000 dps.

5. The motion analysis device according to claim 1, wherein a sampling rate of at least one of the first, second, and third sensors is equal to or greater than 1 ksps.

6. The motion analysis device according to claim 1, wherein a width of the sensor unit is equal to or less than a maximum width of a shaft of the golf club.