Sumitomo Rubber Industries Limited

Dunlop Sports Company Limited

Kazuhiro Hayashi

Takahiro Norimura

Daisuke Kohno

Kosuke Tachibana

An iron golf club head comprises; a head main body including a club face provided with score lines; a weight member having a specific gravity larger than that of the head main body; and a fixing member having a specific gravity larger than that of the head main body and less than that of the weight member, and fixed to the head main body by welding so as to cover the weight member. In a forward tilting state of the club head in which the score lines are horizontal and the club face is vertical, the distance D in the perpendicular direction to the club face from the backmost position of the club head to the center of gravity of the weight member is not more than 47.3% of the maximum thickness w of the club head which is the shortest distance from the backmost position of the club head to the club face.

Iron golf club head

An iron golf club head comprises; a head main body including a club face provided with score lines; a weight member having a specific gravity larger than that of the head main body; and a fixing member having a specific gravity larger than that of the head main body and less than that of the weight member, and fixed to the head main body by welding so as to cover the weight member. In a forward tilting state of the club head in which the score lines are horizontal and the club face is vertical, the distance D in the perpendicular direction to the club face from the backmost position of the club head to the center of gravity of the weight member is not more than 47.3% of the maximum thickness W of the club head which is the shortest distance from the backmost position of the club head to the club face.

A coating regionof a crownhas a maximum saturation portion SRat which a saturation is a maximum value Cmax, a high saturation region SRwhich includes the maximum saturation portion SRand in which a saturation difference from the saturation Cmax is not greater than 15, and a low saturation region SRin which a saturation difference from the saturation Cmax is greater than 15. When a straight line that passes through a face center Fc and extends in a face-back direction is defined as a straight line C, an area of a portion of the high saturation region SRat a toe side with respect to the straight line C is denoted by St, and an area of a portion of the high saturation region SRat a heel side with respect to the straight line C is denoted by Sh, then St&#x3e;Sh.

Golf club head

A golf club head according to the present invention is provided with a face portion, a crown portion and a sole portion, the crown portion including a first area extending in a toe-heel direction along at least part of the face portion and a second area arranged further to a back side than the first area, a sloped surface that extends in the toe-heel direction and slopes downward approaching the back side being formed between the first area and the second area, and a transfer sheet that is formed in a shape corresponding to the sloped surface and is a different color from the first area and the second area being stuck to the sloped surface.

A headincludes a head body hand a face plate pfixed to the head body h. The face plate pincludes a plate front surface fhaving a hitting face, a plate back surface bwhich is a surface opposite to the plate front surface f, and a plate side surface s. The head body hincludes an opening part to which the face plate is disposed, and a receiving surface uwhich supports the face plate pfrom back. The plate back surface bincludes an outer peripheral edge parthaving a circular shape. The outer peripheral edge partincludes a first portion xwhich abuts on the receiving surface u, and a second portion which does not abut on the receiving surface uand forms a gap gp between the second portion and the receiving surface u

A sole surface fof a headincludes a first sole region R. An outer edge of the region Rincludes a first edge line Eg, a second edge line Eg, a third edge line Eg, and a fourth edge line Eg. The line Egis inclined so as to come closer to a face surface toward a toe side. The line Egis inclined so as to come closer to the face surface toward a heel side. The line Egis inclined so as to come closer to the face surface toward the heel side. The line Egis inclined so as to come closer to the face surface toward the toe side. The lines Egto Egare joined to form a single line.

A golf club includes a hollow head, a shaft, and a grip. The headincludes a face f. The face fincludes a thick portion T. The thick portion Tincludes a thick portion center point Ec. A face height at the position of the thick portion center point Ec is defined as H, and the height of the thick portion center point Ec is defined as H. H/His equal to or greater than. The face fpreferably further includes secondary thick portions Tand Tthinner than the thick portion T, and thin portions Tand Tthinner than the secondary thick portions Tand T. The thick portion Tand the secondary thick portions Tand Tpreferably form a sloped thick portion Ts extending from the upper side of a heel to the lower side of a toe.

A golf club setincludes a plurality of golf clubstohaving different club lengths. Each of the golf clubstoincludes a head, a shaft, and a grip. The club length of each of the clubstois 38.5 inches or greater and 42 inches or less. Face progression of the headis substantially constant. If a moment of inertia of the head about an axis line of the shaft is defined as MI, an MI difference ratio between the adjacent clubs is equal to or less than 3%. Preferably, a loft angle is equal to or greater than 17 degrees in each of all the clubsto

Growing community of inventors

Kobe, Japan

Kazuhiro Hayashi