Sumitomo Rubber Industries Limited

Sri Sports Limited

Dunlop Sports Company Limited

Other

A School Corporation Kansai University

Mitsunori Miki

Toyohashi University of Technology

Masahide Onuki

Hiroshi Hasegawa

Hyoungchol Kim

Seiji Hayase

Masahiko Ueda

Naruhiro Mizutani

Tetsuo Yamaguchi

Akihisa Inoue

Yuki Motokawa

Hiromasa Tsunashima

Masaya Tsunoda

Kaname Yamada

Wataru Kimizuka

Hisashi Kakiuchi

Takahiro Sajima

Kohei Mimura

Haruyoshi Minamiguchi

Yohei Ozaki

Keiji Moriyama

Makoto Yoshida

Jun Nishibayashi

Masaru Kono

Norio Sumitomo

Akio Ohnishi

Yoshiaki Shirai

Nobutaka Shimada

Takuzo Iwatsubo

Akio Yamamoto

Hirotaka Nakamura

Tomio Kumamoto

Kazuo Asano

Tomoya Hirano

Yoshiaki Miyamoto

Tao Zhang

Masanori Yabu

Kousuke Okazaki

Jun Ochi

Yuto Nakamura

Satoru Kinuhata

Kouhei Takemura

Yuki Nagano

Eiichi Makabe

Yuichi Takeuchi

Tatsuru Morozumi

Shozo Kawamura

A golf club head having a hollow portion therein, the head includes a face portion, and a main body including a crown portion and a sole portion each extending backwardly from the face portion. The main body is provided with at least one slit that penetrates the main body and extends in a head-front-back direction. The at least one slit includes a pair of slit inner walls extending in the head-front-back direction and at least one joint connecting the pair of slit inner walls to each other.

Golf club head and method for manufacturing the same

A golf club head is provided with a hollow therein and comprises a face portion, a crown portion, a sole portion, a toe and a heel. One of or each of a toe side and a heel side of the crown portion is provided with a first rigidity-decreasing part which is a groove or a slit and extends in a front-rear direction of the head.

Golf club head

A golf club head with a hollow therein comprises a face portion and a main body portion including a crown portion and a sole portion extending rearward from the face portion. The main body portion is provided with at least one slit penetrating through the main body portion. The slit has a width in the toe-heel direction and a length in the front-rear direction which is larger than the width. The surrounding area of the slit is at least partially provided with a thick portion.

A headincludes a head body h, a face part Fp, and a connecting part Cn. The face part Fpincludes a face surface fand a face back surface f. The connecting part Cnconnects the face back surface fof the face part Fpand the head body hto each other. The connecting part Cnmay be provided at a position separated from a peripheral edge of the face back surface f. The peripheral edge of the face back surface fmay be separated from the head body h. The face part Fpmay include a face middle region Rand a face peripheral region R. The connecting part Cnmay be provided only in the face middle region R

Provided is a sensor device-equipped golf shoes comprising: golf shoes including a left and right pair of a first shoe and a second shoe to be worn by a golfer; and a sensor device attached to the golf shoes. The sensor device includes one or more sensor modules configured to measure sensor data pertaining to at least one of an orientation of the first shoe when the golfer takes a shot, an orientation of the second shoe when the golfer takes a shot, and a positional relationship between the first shoe and the second shoe when the golfer takes a shot.

Sensor device-equipped golf shoes

A golf club head has a hollow therein and comprises a face portion, a crown portion and a sole portion. The face portion comprises a central zone including a face center, and a peripheral zone surrounding the central zone. Each of the central zone and the peripheral zone has a flexural stiffness defined by E&#xd7;t/12, wherein E is the Young's modulus (GPa) and t is the thickness (mm) of the zone concerned. The ratio sc/sp of the flexural stiffness Sc of the central zone to the flexural stiffness sp of the peripheral zone is 5.0 to 55.0.

A golf club head having a cavity therein comprises a wall at least a part of which is formed as a convexo-concave wall portion. The convexo-concave wall portion is composed of convexed portions repeatedly arranged in a first direction and a second direction intersecting the first direction, and concaved portions formed between the convexed portions. Each of the convexed portions includes at least one first protrusion extending in the first direction and at least one second protrusion extending in the second direction.

Provided is a sensitive golf club with a sensor unit. The sensor unit includes a battery, a sensor module configured to measure sensor data indicating a state of the golf club using power from the battery, a communications unit configured to wirelessly transmit the sensor data to an external device using power from the battery, and a control unit configured to control operation of the sensor module and the communications unit using power from the battery. The sensor unit has an A mode, and a B mode in which operation of the communications unit is suppressed compared to the A mode. The control unit is configured to judge whether or not the golf club is prepared for a shot based on the sensor data, and switch between the A mode and B mode based on whether or not the golf club is prepared for a shot.

Golf club having sensor unit

A hollow golf club head comprises a face portion having a club face for hitting a ball, and a main body portion including a crown wall, a side wall and a sole wall which extend from the face portion toward the rear of the head. At least one of the walls of the main body portion is provided with a folded portion for facilitating a partial elastic deformation of the main body portion when the face portion hits a ball. The folded portion includes a first folded portion and a second folded portion each extending in the front-back direction of the head while swinging in the thickness direction of the wall. The first folded portion and the second folded portion are continuous with each other and extend along the peripheral edge of the club face, and have different phases in the swing.

Golf club head with deformation portion

This fitting method includes, for example, the following steps A1 to E1:

Fitting method of golf club

A golf club includes a head including a hosel part, a shaft, and a tip engagement part having a reverse-tapered shape and being disposed at a tip end portion of the shaft. The tip engagement part includes a sleeve having a reverse-tapered shape and being fixed to the tip end portion of the shaft. The hosel part includes a hosel hole. The hosel hole includes a reverse-tapered hole corresponding to at least a part of the outer surface of the tip engagement part. The tip engagement part is fitted to the reverse-tapered hole. Of the hosel hole, at least an upper end edge and a lower end edge are formed by a resin.

Golf club

A hollow golf club headcomprises a face portionwhich includes a club facefor striking a ball, and a main bodyextending rearward of the head from the face portion. The face Portionis made of a low-specific-gravity material having a specific gravity of 4.0 or less. The main bodyis provided in its face portionside with a low stiffness zonewhere the stiffness is locally reduced.

A golf club head includes a head body, a face part located apart from the head body, and a plurality of connecting parts that extend between the head body and the face part. Each connecting part includes an inclination portion that extends while inclining with respect to a face perpendicular direction. The inclination portion may include a straight inclination portion that extends along a straight line. The inclination portion may include an arc inclination portion that extends along a circular arc. The inclination portion may include a first inclination portion and a second inclination portion that are inclined inversely to each other. The inclination portion can facilitate deformation of the connecting part at impact.

Provided is a method of evaluating stability of a golf swing. The method comprises calculating a force indicator that represents a force that acts on a body of a golfer during the golf swing and evaluating stability of the golf swing according to a magnitude of the force indicator. In the calculating, the force indicator may be calculated during the golf swing made with a specific golf club, and in the evaluating, the stability of the golf swing may be evaluated as a characteristic of the specific golf club, in accordance with the magnitude of the force indicator.

Method of evaluating stability of golf swing

A hollow golf club head comprises a face part having a face for striking a ball, and a main body extending rearward from the face part. The main body is provided with a low-rigidity zone which comprises through holes and connecting portions arranged alternately along a peripheral edge of the face. The through holes penetrate the main body from the outside to the inside of the main body. The connecting portions extend in the front-back direction of the head, and include an oblique connecting portion comprising an oblique part inclined with respect to the front-back direction.

Growing community of inventors

Kobe, Japan

Masahide Onuki