The Yokohama Rubber Co., Ltd.

Michihiko Sugiura

Nobuo Suzuki

Kazuyuki Kabe

Daisuke Irii

Yoshihiro Inomata

A golf ball whose core is covered with a cover, wherein the core is constituted of a rubber composition containing polybutadiene rubber and the cover is constituted of a resin composition composed of ionomer resin and diene rubber. A golf ball cover material composition composed of ionomer resin, diene rubber and non-staining antioxidant. A method of manufacturing a golf ball cover material composition constituted by mixing/kneading ionomer resin and diene rubber.

Golf ball, golf ball cover material composition and method of manufacturing the composition

In a golf ball a spherical surface of which is divided in such a manner as to correspond to the facets of a 12-20 hedron, dimple patterns having the same arrangement are disposed in spherical regular pentagons, the dimple pattern is constituted in such a manner that the dimple arrangement thereof is different from each other when viewed from the direction of each side of the spherical regular pentagon, and the directions of each dimple pattern in five spherical regular pentagons aligned on one side along each great circle path are different from each other in the same sequence with respect to each great circle path. In a golf ball a spherical surface of which is divided in such a manner as to correspond to the facets of a cubic octagon, too, dimple patterns having the same arrangement is formed in each spherical regular triangle, the dimple pattern is constituted in such a manner that dimple arrangement thereof is different from each other when viewed from the direction of each side of the spherical regular triangle, and the directions of each dimple pattern in three spherical regular triangles aligned on one side along each great circle path are different from each other in the same sequence with respect to each great circle path.

Golf ball

A golf ball includes a substantially spherical surface containing a plurality of dimples of differing diameter. Twelve spherical regular pentagons and twenty spherical regular triangles are arranged on the spherical surface in a manner corresponding to a dodecaicosahedron (12-20 hedron). Each pentagon shares a same asymmetrical dimple pattern such that each of five sides of each pentagon have a dimple pattern that differs from a dimple pattern on four other sides, and all of the pentagons share the same five differing side patterns. Six great circle paths are arranged about the spherical surface, each great circle path being bounded on one side by a series of five adjacent pentagons, one of which is a reference pentagon, and the other four of which are respectively and angularly displaced at angles of 72.degree., 288.degree., 144.degree. and 216.degree. with respect to the reference pentagon. A sequence of angular pentagon displacement of the series is consistent along all six great circle paths.

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Hiratsuka, Japan

Michihiko Sugiura