Sumitomo Rubber Industries Limited

Sri Sports Limited

Teijin Limited

Dunlop Sports Company Limited

Akira Kato

Keiji Moriyama

Satoshi Iwami

Takashi Sasaki

Kuniyasu Horiuchi

Akihiko Hamada

Yoshikazu Yabuki

Yoshinori Sano

Kazuhiko Isogawa

Masatoshi Yokota

Makoto Yoshida

Hidenori Hiraoka

Tadahiro Ebisuno

Nobuo Takahashi

Naoki Kato

Shigeo Koono

Motohiro Kitagawa

Takahiro Sajima

Mikio Yamada

Tsutomu Hirau

Masaaki Kikuchi

Ryozo Hasegawa

Terukuni Ikuta

Hiroshi Hirata

Kazutoshi Mizoi

Toshimi Nishiyama

Yoshikazu Yubuki

Kazuyoshi Takarada

Masamichi Tamada

A wood-type golf club head comprises a face portion having a face for striking a ball. The face comprises a first region having a surface roughness and a second region having a surface roughness larger than that of the first region. The first region is positioned centrally in a toe-heel direction of the face and in an upper side of the face. The second region is positioned adjacently to the first region on a toe side, a heel side and a lower side of the first region and the second region is formed in a U-shape in the front view of the head.

Wood-type golf club head

A golf club head of the present invention includes a face. The face has a score line groove, a fine groove, and a land area. A depth of the fine groove is 0.01 mm or greater and less than 0.03 mm. A width of the fine groove is 0.1 mm or greater and 0.3 mm or less. A pitch of the fine groove is 0.3 mm or greater and 0.7 mm or less. Preferably, the face further has a protruding part protruding beyond the land area. Preferably, the protruding part is provided on a top blade side of the fine groove. Preferably, the protruding part extends along the fine groove.

Golf club head

A golf club has a reverse flex is 80 to 110 mm. The face portion includes a central thick part, a toe-crown-side thin part on a crown-side and on a toe-side of the central thick part, and a heel-sole-side thin part on a sole-side and on a heel-side the central thick part. In the front view of the head, a first straight line passing an area centroid of the toe-crown-side thin part and an area centroid of a back surface of the face portion has an angle &#x3b8;A of 38 to 45 degrees, and a second straight line passing an area centroid of the heel-sole-side thin part and the area centroid of the back surface of the face portion has an angle &#x3b8;B of 40 to 45 degrees, each with respect to the horizontal plane.

Golf club

An iron type golf club head has a toe inclination visually recognizing part and a heel inclination visually recognizing part. The toe inclination visually recognizing part, which is provided on a toe side of a face surface, formed by a visible boundary between a toe side region of the face surface and a center region of the face surface, can be visually recognized to be inclined to a heel side from the toe side in a direction toward a sole side from a top side. The heel inclination visually recognizing part, which is formed on the heel side of the face surface, formed by a visible boundary between a heel side region of the face surface and a center region of the face surface, can be visually recognized to be inclined to the heel side from the toe side in a direction toward the sole side from the top side.

Iron type golf club head

The present invention provides a multi-piece solid golf ball, which is superior in flight distance, spin performance and shot feel. The present invention relates to a multi-piece solid golf ball comprising a core consisting of a center and an intermediate layer, and a cover, wherein the center has surface hardness (D) higher than central point hardness by not less than 15, the intermediate layer and cover are formed from thermoplastic resin as a main component and have a thickness of not less than 0.3 to less than 1.0 mm, the cover has a hardness (F) of not less than 35 to less than 55, a hardness of the intermediate layer is higher than D and F, and a difference (A&#x2212;B) between a deformation amount of the core (A) and that of the golf ball (B) is within the range of not less than 0.15 to less than 0.35 mm.

Multi-piece solid golf ball

The present invention provides a golf ball having excellent shot feel, controllability, rebound characteristics, scuff resistance, yellowing resistance and productivity. The present invention relates to a golf ball comprising a core and a cover covering the core, wherein the cover comprises polyurethane-based thermoplastic elastomer formed by using cycloaliphatic diisocyanate as a base resin.

Golf ball

The present invention provides a three-piece solid golf ball having excellent shot feel, controllability, rebound characteristics, scuff resistance, yellowing resistance and productivity. The present invention relates to a three-piece solid golf ball comprising a core composed of a center and an intermediate layer formed on the center, and a cover formed on the core, wherein the cover comprises a mixture of polyurethane-based thermoplastic elastomer and polyamide-based thermoplastic elastomer as a base resin.

Three-piece solid golf ball

The present invention provides a three-piece solid golf ball having long flight distance by accomplishing low spin amount and high launch angle at the time of hitting, while maintaining good shot feel. The present invention relates to a three-piece solid golf ball comprising a core composed of a center and an intermediate layer formed on the center, and a cover covering the core and having many dimples on the surface thereof, wherein

A golf ball is provided which contains a core and a cover. In the forming of the cover, two half shells made from a thermoplastic resinous composition are used to cover the core, the composite is put in a spherical mold, then, the mold is clamped. Thereafter, the thermoplastic resin where it is heated and pressurized at a pressure of 5 kgf/cmto 50 kgf/cm, and the excess thermoplastic resin composition flows out of the spherical cavity. Subsequently, the thermoplastic resin composition is heated in the spherical cavity and is pressurized at a pressure of 70 kgf/cmor more whereby the cover is formed. The total volume of the two half shells is 105% to 120% of the volume of the cover.

Golf ball manufacturing method

The present invention provides a multi-piece solid golf ball, which is superior in flight distance, spin performance, shot feel and putting sound. The present invention relates to a multi-piece solid golf ball comprising a core consisting of a center, an intermediate layer formed on the center and an outer layer formed on the intermediate layer, and a cover covering the core, wherein the center has a diameter of 10 to 20 mm and a central point hardness in JIS-A hardness of 30 to 85, the intermediate layer has a surface hardness in Shore D hardness of 30 to 55, the outer layer has a hardness in Shore D hardness of 65 to 85 and comprises thermoplastic resin as a main component, and the cover has a Shore D hardness of 35 to 55 and a thickness of 0.3 to 1.5 mm.

A golf ball is provided that is soft and thus provides an excellent shot feeling, the golf ball exhibiting less deterioration in impact resilience and a superior spin characteristic. The golf ball is further superior in burr resistance and scuff resistance when being shot by an iron club. The golf ball is formed of a core and a cover surrounding the core and the cover composition contains a polymer component including 10 to 80 parts by weight of an ethylene-(meth)acrylic acid copolymer-based ionomer resin (Component A), 0 to 60 parts by weight of an ethylene-(meth)acrylic acid-(meth)acrylic acid ester ternary copolymer-based ionomer resin (Component B), and 5 to 60 parts by weight of a thermoplastic elastomer containing a styrene block (Component C). The cover composition has a shore D hardness of 40 to 60.

The present invention provides a multi-piece solid golf ball, which is superior in flight distance, spin performance, shot feel and scuff resistance. The present invention relates to a multi-piece solid golf ball comprising a core consisting of a center and an intermediate layer, and a cover, wherein the center has a diameter of 25 to 40 mm, and a surface hardness (B) is higher than a central point hardness (A) of the center by not less than 15, the intermediate layer has a thickness of 0.5 to 8.0 mm, and a surface hardness of the intermediate layer (C) is higher than the (A) by 15 to 35, the cover comprises polyurethane-based thermoplastic elastomer as a main component, and has a thickness of 0.3 to 1.5 mm and a hardness (D) in Shore D hardness of 35 to 55, and the (D) is higher than the (D) by 3 to 25.

The present invention provides a multi-piece solid golf ball, which is superior in flight distance, spin performance and shot feel. The present invention relates to a multi-piece solid golf ball comprising a core consisting of a center, an intermediate layer formed on the center and an outer layer formed on the intermediate layer, and a cover covering the core, wherein

The present invention provides a thread wound golf ball having long flight distance, and having large spin amount and good controllability at approach shot when hitting by a short iron club and the like, while maintaining soft and good shot feel at the time of hitting as good as the conventional liquid center type thread wound golf balls. The present invention related to a thread wound golf ball comprising (a) a solid center composed of an inner center formed from a vulcanized molded rubber composition containing an oily substance, and a center outer layer formed from an oil-resistant substance and coated around the inner center so as to prevent the oily substance of the inner center from bleeding, (b) a thread rubber layer formed on the solid center, and (c) a cover covering the thread rubber layer, wherein the inner center has a diameter of 24 to 33 mm, a JIS-A hardness of not more than 50 and a deformation amount of not less than 2.0 mm when applying from an initial load of 1 kg to a final load of 5 kg, the center outer layer has a Shore D hardness of not more than 60 and is formed from a resin composition mainly containing thermoplastic resin, and the solid center has a diameter of 25 to 34 mm.

Thread wound golf ball

The present invention provides a multi-piece solid golf ball, which is superior in flight distance, shot feel, controllability and scuff resistance. The present invention relates to a multi-piece solid golf ball comprising a core consisting of a center and an intermediate layer, and a cover having many dimples on the surface thereof, wherein the center has a diameter of 25 to 40 mm, and a surface hardness of the center is higher than a central point hardness of the center in Shore D hardness by not more than 7, the intermediate layer has a thickness of 0.5 to 8.0 mm, and a surface hardness in Shore D hardness of the intermediate layer is higher than the central point hardness of the center by 3 to 25, and a hardness in Shore D hardness of the cover is lower than the surface hardness of the intermediate layer by 0 to 15.

Growing community of inventors

Kobe, Japan

Akira Kato