Sumitomo Rubber Industries Limited

Shinji Ohshima

Takashi Teraguchi

Kengo Oka

Kazunari Yoshida

Hiroyuki Katayama

The invention relates to an apparatus and a method for measuring rotation quantity of a spherical object. A recording device photographs and records a rotating spherical object from one definite direction as a plurality of stationary circular images at definite intervals. An instrumentation device measures positions of definite two points in each of the recorded stationary circular images. An arithmetic unit calculates rotation quantity of the spherical object on each axis of a three-dimensional coordinate-system on the basis of the positions of the two points in each of the stationary circular images.

Apparatus and method for measuring rotation quantity of spherical object

An apparatus and a method for simultaneously measuring velocity and an instantaneous spatial position of a spherical object. A first group of sensors and a second ground of sensors are arranged at known positions at intervals each less than the radius of the spherical object. The times when the spherical object begins to intercept the sensors of the groups of sensors and the time lengths of the respective interceptions are measured by using an instrumentation device. The velocity and instantaneous spatial position of the spherical object are calculated by using an arithmetic unit on the basis of the measured times and time lengths.

Apparatus and method for measuring velocity and instantaneous spatial

An apparatus and a method for measuring head speed and an opening angle. At least four sensors are disposed at each vertex of a defined rectangle. An instrumentation device measures differences in time between instants in which a moving head intercepts rays of light toward the sensors, respectively. An arithmetic unit calculates head speed and an opening angle on the basis of the measured time differences.

Apparatus and method for measuring head speed and opening angle using

A golf ball having a plurality of dimples on a surface thereof characterized in that more than 40% of all dimples are polygonal in shape and have a double slope in section having a straight first slope and a straight second slope continued radially inwardly from the first slope, and the gradient of the first slope of said double slope disposed in the vicinity of a dimple edge is greater than that of the second slope disposed in the vicinity of the bottom thereof.

Golf ball

A golf ball having circular dimples and noncircular dimples arranged in different percentages depending on the spherical zones, whereby a favorable aerodynamic property is obtained by eliminating the difference in trajectories between line hitting and face hitting.

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Akashi, Japan

Shinji Ohshima