Abstract: A wireless power-feeding apparatus that enables efficient wireless feeding to a power-receiving coil embedded at the center of a spherical power-receiving device. The apparatus includes: a holding member for holding the power-receiving device; a power-transmitting coil; a driver circuit for supplying the power-transmitting coil with high-frequency current to generate a magnetic flux for wireless power-feeding to the power-receiving coil; and a wireless data receiver for receiving data transmitted regularly from a wireless data transmitter, the power-transmitting coil being positioned relative to the holding member in such a manner that the axes of the power-receiving coil and the power-transmitting coil are parallel to each other when the power-receiving device is held by the holding member in such a manner that a mark provided on the surface of the power-receiving device faces a predetermined direction.

Abstract: A wireless power-feeding apparatus that enables efficient wireless feeding to a power-receiving coil embedded at the center of a spherical power-receiving device. The apparatus includes: a holding member for holding the power-receiving device; a power-transmitting coil; a driver circuit for supplying the power-transmitting coil with high-frequency current to generate a magnetic flux for wireless power-feeding to the power-receiving coil; and a wireless data receiver for receiving data transmitted regularly from a wireless data transmitter, the power-transmitting coil being positioned relative to the holding member in such a manner that the axes of the power-receiving coil and the power-transmitting coil are parallel to each other when the power-receiving device is held by the holding member in such a manner that a mark provided on the surface of the power-receiving device faces a predetermined direction.

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.

Abstract: In an evaluation information provision system, subject's motion data is stored in association with attributes. When an attribute is assigned, the evaluation information provision system selects feature data from a plurality of the subject's motion data associated with the assigned attribute. The evaluation information provision system calculates a score for the assigned attribute, for the user's motion, using a statistical distance between the selected feature data and the user's motion data. The calculated score is displayed, for example, as a screen.

Abstract: A shoe is configured such that front and back clearances, which are respectively provided between a front wall surface of a second receiving portion and a front end of a second buffering member received in the second receiving portion and between a back wall surface of the second receiving portion and a back end of the second buffering member received in the second receiving portion, permit the second buffering member made of an elastic material to move in a longitudinal direction in the second receiving portion when a ground surface of an outsole contacts the ground and the weight of a human body is put on a heel support surface.

Abstract: A swing analysis device for analyzing a swing of a ball hitting tool includes: an information input unit configured to receive input of acceleration information and angular velocity information detected by a sensor attached to the ball hitting tool; a posture calculation unit configured to calculate posture information of the ball hitting tool in the swing by applying a predetermined filter to the acceleration information and the angular velocity information; a correction unit configured to correct the posture information of the ball hitting tool in the swing based on the posture information of the ball hitting tool at a first time in the swing; and a swing information calculation unit configured to calculate a swing trajectory of the ball hitting tool based on the acceleration information and the posture information of the ball hitting tool corrected by the correction unit.

Abstract: In an evaluation information provision system, subject's motion data is stored in association with attributes. When an attribute is assigned, the evaluation information provision system selects feature data from a plurality of the subject's motion data associated with the assigned attribute. The evaluation information provision system calculates a score for the assigned attribute, for the user's motion, using a statistical distance between the selected feature data and the user's motion data. The calculated score is displayed, for example, as a screen.

Abstract: A swing analysis device for analyzing a swing of a ball hitting tool includes: an information input unit configured to receive input of acceleration information and angular velocity information detected by a sensor attached to the ball hitting tool; a posture calculation unit configured to calculate posture information of the ball hitting tool in the swing by applying a predetermined filter to the acceleration information and the angular velocity information; a correction unit configured to correct the posture information of the ball hitting tool in the swing based on the posture information of the ball hitting tool at a first time in the swing; and a swing information calculation unit configured to calculate a swing trajectory of the ball hitting tool based on the acceleration information and the posture information of the ball hitting tool corrected by the correction unit.

Abstract: A measurement system capable of easily notifying a subject of characteristics of motion during swing is provided. A measurement system for measuring motion of a subject includes a detection unit attached to a lower back portion of the subject, which is capable of obtaining motion information on motion of the lower back portion during swing by the subject, a processing unit finding an evaluation parameter for a swing by the subject based on the motion information obtained by the detection unit, and an output unit outputting the evaluation parameter found by the processing unit.

Abstract: An iron golf club has a club length L measured in accordance with 60-degrees method of at least 36.5 inches, and it includes: a carbon shaft; a weight attached to said carbon shaft; a grip attached to one end of said carbon shaft; and a head attached to the other end of said carbon shaft. Sum total of mass of the carbon shaft, the weight, the grip and the head is at least 0.3996 kg and at most 0.4197 kg. A value r/L, where r represents a distance from an upper end of the grip to the center of gravity of the iron golf club, is at least 0.765 and at most 0.795. Thus, an iron golf club realizing improved easiness of swing can be provided.

Abstract: A golf club having a value of L not less than 45.5 inches, with L representing a club length measured with a 60-degree method, includes a shaft, a grip attached to one end of the shaft, and a head attached to the other end of the shaft. A value of r/L is equal to or not smaller than 0.658 and equal to or not greater than 0.732, where r represents a distance from an upper end of the grip to the center of gravity of the golf club. Thus, a long-length golf club achieving an increased head speed can be obtained.

Abstract: A golf club having a value of L not less than 45.5 inches, with L representing a club length measured with a 60-degree method, includes a shaft, a grip attached to one end of the shaft, and a head attached to the other end of the shaft. A value of r/L is equal to or not smaller than 0.658 and equal to or not greater than 0.732, where r represents a distance from an upper end of the grip to the center of gravity of the golf club. Thus, a long-length golf club achieving an increased head speed can be obtained.

Abstract: A wood golf club head is adapted to achieve the maximum flight distance or optimum trajectory of a golf ball, by incorporating features to achieve an appropriate correlation between launch angle and backspin speed of a golf ball that is struck by the club head. A wood golf club head is designed to achieve a launch angle and a backspin speed of a golf ball located in an angle-spinspeed region defined by an ellipse having a center point O(21, 1800), length of a major axis L equal to 2100(rpm), length of a minor axis S equal to 5.7(deg), and tilt angle ? of the major axis measured in a counterclockwise direction from the vertical axis equal to 0.25(deg), wherein the horizontal coordinate designates the launch angle(deg) of the golf ball, the vertical coordinate designates the backspin speed(rpm) of the golf ball, and the horizontal and vertical axes have the same numerical scale. Preferably, the wood golf club head has a face formed of a low friction material and a loft angle of 13 to 20 degrees.

Abstract: The inventive golf club comprises a head of a metal having a face and a flexural range, defined in the face, where the quantity of flexure in a direction perpendicular to the face is at least 45% of the maximum quantity of vertical flexure of the face. The flexural range is arranged in coincidence with a hitting spot distribution range of a player in the face. Alternatively, a flexural range having a spring constant of at least 2 kN/mm and not more than 4 kN/mm is present in the face of the inventive golf club.

Abstract: A golf club head (1) having a hollow portion is partly or entirely provided with a PCCP structure (2) excluding its face portion (16). By this structure, a golf club head having an outer body structure which permits the thickness of the head to be reduced without loss in the strength to be provided.

Abstract: A wood golf club head adapted to effectively achieve the maximum flight distance of a golf ball, that is, describe the optimum trajectory of a golf ball, by incorporating an appropriate correlation between launch angle and backspin speed of a golf ball after striking it. A wood golf club head is designed so that launch angle and backspin speed of a golf ball can be located in the region defined by an ellipse whose center is Point O(21, 1800), length of a major axis L is equal to 2100(rpm), length of a minor axis S is equal to 5.7(deg), and gradient &thgr; of the major axis measured in a counterclockwise direction from the vertical axis is equal to 0.25(deg), wherein the horizontal coordinate designates the launch angle(deg) of a golf ball, the vertical coordinate designates the backspin speed(rpm) of a golf ball, and the horizontal and vertical axes are on the same scale. A face 2a of the wood golf club head is formed of a low friction material.

Abstract: In the metal iron golf club head (1), the rigidity of the medium sensitivity region (5) which is a region on the heel side and excluding the vicinity of the face center (3) is made lower than the rigidity of the low sensitivity region (4) so as to approximate the natural frequency of the metal iron golf club head to the natural frequency of the ball as well as to ensure the strength in the face portion (2).

Abstract: In the metal iron golf club head (1), the rigidity of the medium sensitivity region (5) which is a region on the heel side and excluding the vicinity of the face center (3) is made lower than the rigidity of the low sensitivity region (4) so as to approximate the natural frequency of the metal iron golf club head to the natural frequency of the ball as well as to ensure the strength in the face portion (2).

Abstract: The inventive golf club comprises a head of a metal having a face and a flexural range, defined in the face, where the quantity of flexure in a direction perpendicular to the face is at least 45% of the maximum quantity of vertical flexure of the face. The flexural range is arranged in coincidence with a hitting spot distribution range of a player in the face. Alternatively, a flexural range having a spring constant of at least 2 kN/mm and not more than 4 kN/mm is present in the face of the inventive golf club.

Abstract: In the metal iron golf club head (1), the rigidity of the medium sensitivity region (5) which is a region on the heel side and excluding the vicinity of the face center (3) is made lower than the rigidity of the low sensitivity region (4) so as to approximate the natural frequency of the metal iron golf club head to the natural frequency of the ball as well as to ensure the strength in the face portion (2).