Bridgestone Sports Co., Ltd.

Bridgestone Corporation

Wataru Ban

Kozue Wada

Fumiaki Sato

Hideo Matsunaga

Tadahiro Narita

Hideo Shimazaki

Hiroshi Takahashi

Atsuo Tateno

Tomonori Kitagawa

Atsushi Komatsu

Tatsuya Ishikawa

Vinh-Duy Thai Nguyen

Kazuo Uchida

Koki Motoyoshi

Daisuke Mikame

Tomotaka Ishihara

Hiroyuki Ueda

Takeyuki Yano

Katsutoshi Kasuya

Yoshihumi Nakajima

The golf club head includes a face portion, a plurality of score lines formed in the face portion and extending in a toe-heel direction, and a plurality of convex portions formed in the face portion, projecting from reference plane which includes edges of each of the plurality of score lines, and extending in the toe-heel direction. The plurality of convex portions include a first convex portion and a second convex portion formed between adjacent score lines. A projecting height of the first convex portion and/or a width in an orthogonal direction of the toe-heel direction of the first convex portion is larger than that of the second convex portion.

Golf club head

A golf club head having a volume of from 400 cc through 460 cc includes: a face portion that includes a face surface that is to be a striking surface; and a body portion that includes carbon fiber-reinforced plastics. The body portion includes a sole portion, a crown portion, and a weight member attached to the sole portion at an inner-surface side thereof. The weight member includes a first weight member that is disposed directly below a center of gravity of the golf club head, and a second weight member that extends from the first weight member in a toe-heel direction.

A golf club head includes a face portion, a plurality of score lines formed in the face portion and extending in a toe-heel direction, a plurality of convex portions formed in the face portion and extending in the toe-heel direction between the score lines adjacent to each other in a vertical direction of the face portion, and at least one concave portion formed in the face portion and extending in the toe-heel direction between the convex portions adjacent to each other in the vertical direction. A flat surface is formed between the concave portion and the convex portion adjacent to the concave portion.

Golf club head and manufacturing method thereof

A golf club head includes a face portion, score lines n the face portion and extending in a toe-heel direction, protruding portions formed on the face portion and extending parallel to the score lines, and recessed portions formed on the face portion and extending parallel to the score lines. Each protruding portion and each recessed portion are formed alternately in a direction orthogonal to the toe-heel direction. The protruding portions include first protruding portions and second protruding portions. Each apex portion of the first protruding portions is positioned in a first imaginary plane parallel to a reference plane that contains each edge of the score lines. Each apex portion of the second protruding portions is positioned in a second imaginary plane parallel to the reference plane and different from the first imaginary plane.

A golf club head including a face portion includes a plurality of score lines formed on the face portion, a plurality of first grooves formed on the face portion, and a plurality of second grooves formed on the face portion. The first grooves have a depth Dand a width Wthat is in a direction orthogonal to a direction in which the first grooves extend, the second grooves have a depth Dand a width Wthat is in a direction orthogonal to a direction in which the second grooves extend, WDand WD

A golf club set includes a plurality of golf clubs having different loft angles. The plurality of golf clubs have the same lie angle. Each loft angle difference between two golf clubs that are adjacent in a loft angle order is the same. Each club length difference between two golf clubs that are adjacent in the loft angle order is 0.125 inches (3.175 mm) (inclusive) to 0.375 inches (9.525 mm) (inclusive). A loft angle of a golf club having a minimum frequency is smaller than a loft angle of a golf club having a maximum frequency. A difference between the minimum frequency and the maximum frequency is not less than 40 cpm.

Golf club set

A wood type golf club head includes a face portion, a crown portion, and a sole portion. The face portion includes an impact area, a toe-side area on a toe side with respect to the impact area, and a heel-side area on the heel side with respect to the impact area. At least one groove is formed in the toe-side area and/or the heel-side area. The depth of the groove is 0.025 mm (inclusive) to 0.508 mm (inclusive). A groove area occupancy in the toe-side area is different from a groove area occupancy in the heel-side area.

A golf club head includes: a crown portion; a sole portion; a face portion; and a hosel portion. The crown portion includes a concave portion that starts from the face portion, passes through a boundary portion of the hosel portion and the crown portion, and extends toward a back side. The concave portion includes a range from the face portion toward the back side where a width of the concave portion is larger than a depth of the concave portion. The range passes on a toe side of the hosel.

A golf club head includes a face, a sole, an attachment member, an attachment part, and a rib. The face includes a ball-striking surface. The sole defines the bottom of the golf club head. The attachment member is attachable to the attachment part. The rib is formed on the internal surface of the golf club head, and at least partially surrounds the attachment part.

A golf club head includes a crown portion and a face portion. The crown portion includes a first protruding portion arranged on the side of the face portion, and a second protruding portion arranged on the back side to be adjacent to the first protruding portion. The width of the first protruding portion in the face-back direction on a plane passing through the face center of the face portion and extending in the vertical direction is smaller than the width of the second protruding portion in the face-back direction. The protruding height of the second protruding portion is larger than the protruding height of the first protruding portion.

A golf club head according to this invention is a wood type golf club head including a face portion, a crown portion, and a sole portion. A plurality of grooves are formed in the face portion. The depth of the plurality of grooves is less than 0.025 mm. A film having a thickness not more than the depth is formed on the face portion by a surface treatment.

Golf club head with grooves shallower than scorelines and surface film thickness

A golf club head of this invention includes a face portion, first and second interchangeable members, a first attachment portion from which the first and second interchangeable members are detachable, and a second attachment portion from which the first and second interchangeable members are detachable. The first interchangeable member is a reinforcing member that abuts against the rear surface of the face portion and restricts deformation of an abutment portion when the member is attached to the first attachment portion. The second interchangeable member is a member that does not abut against the rear surface of the face portion when the member is attached to the first attachment portion.

A golf club head according to this invention is a wood type golf club head including a face portion, a crown portion, and a sole portion. A plurality of grooves are formed in the face portion. The depth of the plurality of grooves is less than 0.025 mm. Each pitch between adjacent grooves of the plurality of grooves ranges from 0.1 mm (inclusive) to 1 mm (inclusive).

Golf club head with grooves shallower than scorelines and goove pitch and length

An iron type golf club head includes a body part that is provided with a face surface and a sole surface; and a hosel part that is connected to the body part. A lower part of a back surface of the body part is an expansion part that expands rearward, a slit is disposed, which penetrates the expansion part from an upper surface to a lower surface of the expansion part, an elastic body is arranged in the vicinity of an upper part of the slit.

Growing community of inventors

Chichibu, Japan

Wataru Ban