Bridgestone Sports Co., Ltd.

Fuji Photo Film Company, Limited

Honda Giken Kogyo Kabushiki Kaisha

Honda Motor Co., Ltd.

Japan Metal Gasket Co., Ltd.

Toyo Roki Seizo Kabushiki Kaisha

Bridgestone Corporation

Toyoda Gosei Co., Ltd.

The Yokohama Rubber Co., Ltd.

Nifco Inc.

Honda Giken Kogyo K.k.

Osg Corporation

Toyo Denso Kabushiki Kaisha

Sanoh Kogyo Kabushiki Kaisha

Honda Giken Kogyo Kabushiki Kaisha (honda Motor Co., Ltd.)

Hideo Watanabe

Akira Kimura

Atsuki Kasashima

Junji Umezawa

Junji Hayashi

Rinya Takesue

Yoshinori Egashira

Masanobu Kuwahara

Hisashi Yamagishi

Yasushi Ichikawa

Katsunori Sato

Hiroyuki Nagasawa

Takashi Shoji

Jun Shindo

Kosaku Ueta

Tsuyoshi Nakajima

Yasumasa Shimizu

Kazuo Shimura

Hirotaka Shimosaka

Takashi Ohira

Atsushi Komatsu

Shigeru Saotome

Akira Kawata

Takenori Suzuki

Hiroshi Higuchi

Nobuyoshi Nakajima

Tetsu Wada

Nobufumi Mori

Takeshi Suzuki

Takeaki Nakajima

Yuichiro Ozawa

Yuji Ohara

Tatsuya Kuroda

Kazumi Yamazaki

Noboru Arai

Haruo Tsusaka

Shoji Takahashi

Kenji Tajima

Hiroaki Mihara

Yutaka Kanaguchi

Kouichi Ikuma

Masatoshi Udagawa

Shinya Makino

Motoaki Takahashi

Shinichi Hinomoto

Hideki Hoshino

Hideki Kimura

Yuichi Hosoi

Kazuo Horikawa

Hiroshi Kitagawa

Masamitsu Ishida

Atsushi Nakamura

Hiroaki Kito

Kenichiro Kaneko

Shigeki Baba

Kenji Matsumoto

Atuki Kasasima

Koichi Hidano

Kenichi Sawada

Hiroshi Nishi

Takashi Kiyomiya

Hiroto Sasaki

Hideo Moriwaki

Toshihiko Kanezaki

Ryoichi Yoshimura

Masayuki Tamura

Masataka Kumata

Satoshi Kawasaki

Takanori Tago

Takaharu Sato

Toshihiko Manami

Shoji Uhara

Yasuhiro Hasegawa

Tadahisa Nakamura

Takenori Tomita

Satoshi Komuro

Yoshinobu Terada

Naritoshi Muramatsu

Atsushi Suzuki

Masahiko Igarashi

Takeshi Mochizuki

Yoshihiro Umebayashi

Masahito Mitsumori

Masashi Takezawa

Masatoshi Oikawa

Akifumi Ohtaka

Kazuaki Kobayashi

Ryutaro Shinohara

Tooru Wako

Shinya Murabayashi

Noboru Sagara

Nobuyoshi Asaga

Tsutomu Mori

Tsuyoshi Sawada

Daisuke Sakurai

Toru Tanamura

Hideki Kaseyama

Manabu Igusa

Shouji Sekiai

Masahiro Oiwake

In a multi-piece solid golf ball having a core, an intermediate layer encasing the core and a cover which encases the intermediate layer and has numerous dimples on an outside surface thereof, the core is formed of a rubber composition including the specific ingredient compounding ingredients, the intermediate layer is formed of a resin material, the cover is formed of a urethane resin material, the core has a diameter of at least 38.0 mm, the core has a deflection when compressed under a final load of 1,275 N (130 kgf) from an initial load of 98 N (10 kgf) of at least 3.9 mm, the sphere obtained by encasing the core with the intermediate layer (intermediate layer-encased sphere) has a surface hardness on the Shore D hardness scale of at least 69, the ball has a surface hardness on the Shore D hardness scale of 62 or less, and the (intermediate layer thickness)(core diameter) value is from 0.025 to 0.043, the (cover thickness)/(core diameter) value is from 0.014 to 0.027.

Multi-piece solid golf ball

In a golf ball having a core, an intermediate layer and a cover, the ball and the sphere obtained by encasing the core with the intermediate layer have respective surface hardnesses such that (surface hardness of ball)<(surface hardness of intermediate layer-encased sphere); the ball has an initial velocity of ≤75.0 m/s; and the core has a hardness profile in which the center hardness, the hardness at a midpoint between the core center and core surface, and the hardnesses at specific positions inward from the midpoint and at specific positions outward from the midpoint are optimized. Given the possibility that the rules limiting the distance traveled by a golf ball on shots by long hitters will change, this ball reduces the drop-off in distance on driver shots and iron shots taken by average hitters while increasing the drop-off in distance on driver shots taken by long hitters.

Provided is a golf ball including a core, an intermediate layer, and a cover. A relationship between surface hardness of an intermediate layer-encased sphere and surface hardness of the ball satisfies a predetermined relational expression. With an initial velocity of the ball and a deflection under a predetermined load applied to the ball optimized, and letting a value of (initial velocity of core×weight of core) be Ciw, a value of [(initial velocity of intermediate layer-encased sphere−initial velocity of core)×(weight of intermediate layer-encased sphere−weight of core)] be Miw, and a value of [(initial velocity of ball−initial velocity of intermediate layer-encased sphere)×(weight of ball−weight of intermediate layer-encased sphere)] be CViw, the following expression is satisfied:2500≤≤2650. A volume occupancy ratio of dimples is set to a predetermined range.

In a golf ball for professional golfers and skilled amateurs which has a single-layer core, a cover and at least one intermediate layer therebetween, the intermediate layer has a specific gravity of at least 1.05, the sphere the sphere obtained by encasing the core with the intermediate layer (intermediate layer-encased sphere) and the ball have a surface hardness relationship which satisfies the condition:(surface hardness of intermediate layer-encased sphere)>(surface hardness of ball).The core has a diameter of from 35.5 to 39.5 mm and a distinctive hardness profile that satisfies specific conditions. The ball is endowed with both an excellent flight performance and excellent durability to repeated impact.

Golf ball

The golf ball includes a core having an inner layer core and an outer layer core, a single-layered intermediate layer and cover, wherein the inner layer core is formed of a rubber composition, the intermediate layer and the cover are formed of a resin composition, and a relationship between an initial velocity of the inner layer core, an initial velocity of the entire core, an initial velocity of an intermediate layer-encased sphere, and an initial velocity of a ball satisfies the following conditions:(initial velocity of ball)<(initial velocity of intermediate layer-encased sphere)(initial velocity of intermediate layer-encased sphere)−(initial velocity of entire core)≤0.70 (m/s)(initial velocity of entire core)−(initial velocity of inner layer core)≥0.20 (m/s)

Provided is a golf ball including a core, an intermediate layer, and a cover. A relationship between surface hardnesses of an intermediate layer-encased sphere and the ball satisfies a predetermined relational expression. With a ball initial velocity and a deflection under a predetermined load applied to the ball optimized, and letting a value of (initial velocity of core×weight of core) be Ciw, a value of [(initial velocity of intermediate layer-encased sphere−initial velocity of core)×(weight of intermediate layer-encased sphere−weight of core)] be Miw, and a value of [(initial velocity of ball−initial velocity of intermediate layer-encased sphere)×(weight of ball−weight of intermediate layer-encased sphere)] be CViw, the following condition is satisfied: Lift coefficients and drag coefficients at predetermined Reynolds numbers and spin rates are set to predetermined ranges.

In a golf ball including a core, an intermediate layer, and a cover, the relationship of the surface hardness between an intermediate layer-encased sphere and the ball satisfies a predetermined relational expression, and with an initial velocity of the ball and a deflection under a predetermined load applied to the ball optimized, and letting a value of (initial velocity of core×weight of core) be Ciw, a value of [(initial velocity of intermediate layer-encased sphere−initial velocity of core)×(weight of intermediate layer-encased sphere−weight of core)] be Miw, and a value of [(initial velocity of ball−initial velocity of intermediate layer-encased sphere)×(weight of ball−weight of intermediate layer-encased sphere)] be CViw, the expression of Ciw+Miw+CViw is optimized, and lift and drag coefficients at predetermined Reynolds numbers and spin rates of dimples are set to predetermined ranges.

A multi-piece solid golf ball includes a core, an intermediate layer, and a cover, in which the core is formed of a rubber composition, the intermediate layer and the cover are formed of a resin composition, and a specific gravity of the intermediate layer is set to at least 1.05, or a relationship among a core surface hardness, a surface hardness of an intermediate layer-encased sphere, and a ball surface hardness satisfies the following condition:ball surface hardness<surface hardness of intermediate layer-encased sphere>core surface hardness

A golf ball includes a core, an intermediate layer, and a cover, in which an initial velocity is not more than 76.0 m/s, a deflection when the ball is compressed under a specific load is at least 2.8 mm, and letting a value of (initial velocity of core×weight of core) be Ciw, a value of [(initial velocity of intermediate layer-encased sphere−initial velocity of core)×(weight of intermediate layer-encased sphere−weight of core)] be Miw, and a value of [(initial velocity of ball−initial velocity of intermediate layer-encased sphere)×(weight of ball−weight of intermediate layer-encased sphere)] be CViw, the condition is of Ciw+Miw+CViw≤2,550 is satisfied, thereby to be capable of making a distance for reducing a distance on shots with a driver and an iron by average hitters smaller.

In a golf ball having a core, a cover, at least one intermediate layer therebetween, and a coating layer on the cover, the cover is formed of a transparent or translucent resin composition and the intermediate layer is formed of a resin composition. The sphere consisting of the core encased by the intermediate layer has specific lightness and chroma values in the Lab color space. The coating layer is composed of one or more layer, at least one of which contains an effect pigment having polarizing properties. Markings are provided inside of the coating layer and have a specific L value. During use, the ball retains a visual to familiarity close to that of a white ball. Up close, it is clearly discernible from a white ball; from a distance, it appears white and is highly visible.

In a multi-piece solid golf ball having a core, an envelope layer, an intermediate layer and a cover, the core is formed of one or more layer of a rubber composition; the envelope layer, intermediate layer and cover are each formed of a single layer of resin material; the hardness relationship among the layers satisfies the following two conditions:material hardness of cover>material hardness of intermediate layer, andmaterial hardness of envelope layer≥surface hardness of core;the ball additionally satisfies the condition:

In a golf ball having a core, envelope layer, intermediate layer and cover, the core has a specific hardness profile, the resin materials making up either or both of the envelope layer and the intermediate layer has a material hardness on the Shore D hardness scale of at least 65 and has a specific gravity of at least 1.05, and the Shore C hardness relationships among the core center, surface of the envelope-encased layer and surface of the intermediate layer-encased sphere satisfy the following conditions:surface hardness of envelope layer-encased sphere<surface hardness of intermediate layer-encased sphere,  (1)surface hardness of intermediate layer-encased sphere−center hardness of core≥40.  (2)This ball achieves a good distance on shots with utility and iron clubs, is receptive to spin in the short game, and has a soft feel at impact on all shots, making it useful to amateur golfers.

In a golf ball having a core and a cover with a plurality of dimples on the surface, the cover is formed primarily of polyurethane, the dimples have a specific volume occupancy ratio and the ball has a diameter of at least 42.8 mm. In an impact test carried out by hitting the ball with a driver at a head speed of 40 m/s, the sum t+tof the time trequired from initial contact by the driver with the ball for deformation of the ball to reach a maximum and the time trequired from the state of maximum ball deformation for the ball and driver to separate is 660 μsec or less. This golf ball makes it possible for golfers who have a high head speed and ordinary golfers who do not to compete without relying excessively on superiority in terms of distance.

In a golf ball for professional golfers and skilled amateurs which has a single-layer core, a cover and at least one intermediate layer therebetween, the sphere obtained by encasing the core with the intermediate layer (intermediate layer-encased sphere) and the ball have a surface hardness relationship which satisfies the condition:(surface hardness of intermediate layer-encased sphere)>(surface hardness of ball).The core has a diameter of from 35.5 to 39.5 mm and a distinctive hardness profile that satisfies specific conditions. The ball is endowed with both an excellent flight performance and excellent durability to repeated impact.

In a golf ball having a core, an envelope layer, an intermediate layer and a cover, the difference between the center hardness and the surface hardness of the core is set in a specific range, the intermediate layer is formed of a resin material that includes a high-acid ionomer, the Shore C hardness relationships among the core center and the surfaces of the envelope-encased layer and the intermediate layer-encased sphere satisfy specific conditions; and the ball has a deflection when compressed under a given load which is at least 2.7 mm. This ball achieves a good distance on shots with a driver, utility club or iron, is receptive to spin in the short game, and has a soft feel at impact on all shots, making it useful to amateur golfers.

Growing community of inventors

Chichibu, Japan

Hideo Watanabe