Mizuno Corporation

Kanta Shimotaka

Koji Sakai

Takashi Kimura

Mototaka Iwata

Kei Tsuji

Hiroshi Nagao

A golf club head ( ) has an ellipsoid of inertia ( ) with its center at a center of gravity G. When the ellipsoid of inertia ( ) is virtually cut with a plane passing through the center of gravity of the golf club head ( ) and being parallel to a face surface ( ), a major axis of a plane ellipse ( ) appearing on its cut surface forms an angle of &thgr; with an intersecting line ( ) of the cut surface and a ground surface ( ). The major axis extends upward and away from the ground surface ( ) as it approaches a toe part ( ). The angle &thgr; is not smaller than 0.5&deg; and not larger than 9.5&deg;. An aspect ratio a/b defined by a ratio of the length a of the major axis ( ) to the length b of a minor axis ( ) of the plane ellipse ( ) is not smaller than 1 and not larger than 4.

Growing community of inventors

Osaka, Japan

Kanta Shimotaka