Abstract: An iron golf club head includes a head main body and an FRP body. The head main body includes a face portion, a first face along the face portion, second faces, and a recess behind the head portion. The second faces continue from a rear face of the face portion to the first face. The recess is defined by the first face and the second faces. The hollow FRP body is disposed in the recess, overlaps the first face and the second faces, and closes an opening portion of the recess. At least a part of crossing corner portions between the first face and the second faces has a curved face.

Abstract: An iron golf club head includes a head main body and an FRP body. The head main body includes a face portion, a first face along the face portion, second faces, and a recess behind the head portion. The second faces continue from a rear face of the face portion to the first face. The recess is defined by the first face and the second faces. The hollow FRP body is disposed in the recess, overlaps the first face and the second faces, and closes an opening portion of the recess. At least a part of crossing corner portions between the first face and the second faces has a curved face.

Abstract: A golf club head having a head body, a face plate fixedly attached to the front surface of the head body, a weight fixedly attached to the front surface of the sole portion of the head body, and an elastic body charged into a first recess portion of the golf club head. The elastic body is compressed to stick fast to the rear surface of the face plate. The lower portion of the head body having first and second recess portions is formed as a bulging portion bulging at the rear of the head body. The JIS C hardness of the elastic body is preferably 15–80, more preferably 18–70, most preferably 20–60.

Abstract: A hollow club head having a head body 14 and a face member 16 bonded to the face opening 12 of the head body 14 is provided, wherein the W/H ratio between the maximum height H (mm) and maximum width W (mm) of the face member is in the range of 1.0 to 1.7, so as to improve cost efficiency associated with improved repulsive speeds of balls hit by the club.

Abstract: A hollow golf club head has a face portion, a sole portion, a side portion, a crown portion, and a hosel portion. A main portion of the crown portion is made of fiber reinforced plastic. At least the face portion and the front edge portion of the crown portion continuing to the face portion are made of metal. A circumferential edge portion of the crown portion made of fiber reinforced plastic is joined to the rear end surface and the internal surface of the metal front edge portion of the crown portion.

Abstract: A wood-type golf club head includes a metal sole portion, an elastic body and a weight member. At least one recess is defined in the metal sole portion to extend in a front-rear direction over at least half-length of a front-rear length of the sole portion. The elastic body is embedded in the recess. The weight member is fixed to the recess to cover the elastic body. The weight member is flush with the sole portion. A total area of the recess is in a range of 10% to 60% of that of the sole portion.

Abstract: A golf putter head includes a hollow-structured body frame made of a metal material having a specific gravity of 4 to 9, which includes a face forming a recess, a crown forming in a center thereof a depression occupying at least 35% of an entire area of the crown, a toe, a heel, first and second sides extending backward from the toe and the heel respectively, a back connecting the first side and the second side, and a sole. A weight distribution is provided so that the toe, the heel, and the back are increased in wall thickness relative to a remaining portion. A face member made of a material having a specific gravity of 0.9 to 3 is attached to the recess of the face. A crown member made of the material having the specific gravity of 0.9 to 3 is attached to the depression of the crown.

Abstract: A hollow golf club head has a face portion, a sole portion, a side portion, a crown portion, and a hosel portion. A main portion of the crown portion is made of fiber reinforced plastic. At least the face portion and the front edge portion of the crown portion continuing to the face portion are made of metal. A circumferential edge portion of the crown portion made of fiber reinforced plastic is joined to the rear end surface and the internal surface of the metal front edge portion of the crown portion.

Abstract: A recess portion is provided on a rear face of a head main body. A resin layer is bonded between ribs, of an innermost face. After an element assembly of the resin layer, an element assembly of the FRP body and a balloon are inserted into the recess portion, the iron golf club head is mounted in a mold, and a gas such as air is supplied into the balloon through an air opening inserted into an opening.

Abstract: A golf club head includes a first metallic member, a second metallic member having different thickness from the first metallic member, and a part where the first and second metallic members are welded by plasma welding, laser welding or electron beam welding. A gap between the first and second metallic members is filled up with another metal material besides the first and second metallic members.

Abstract: A hollow golf club head includes a head main body having a face opening portion on a face side, and a face member that closes the face opening portion. A part or all of an upper edge of the face opening portion and an upper edge of the face member extends to a crown portion.

Abstract: A hollow golf club head includes a face portion, a sole portion, a side portion, a crown portion and a hosel portion. A main portion of the crown portion is made of a fiber plastic resin. At least the face portion, a front edge portion of the crown portion continuous with the face portion, and a central portion of the sole portion in a toe-heel direction are made of a metal. A loft angle is in a range of 14° to 25°. A head volume is in a range of 100 cc to 230 cc. A weight of a fiber plastic resin portion of the golf club head is in a range of 6% to 30% of a weight of the golf club head.