Patent ID: 7559853

Claim:
A golf club head having a hollow structure comprising a face portion, a crown portion, a sole portion, a side portion, and a hosel portion, and composed of a main member provided with a top opening in the crown portion and a front opening in the face portion, a face member covering the front opening and forming a club face for striking a ball, and a crown member covering the top opening, wherein said face member is made of a first titanium alloy, said main member is made of a second titanium alloy having a larger specific gravity than that of said first titanium alloy, said crown member is made of a third titanium alloy different from the first and second titanium alloys, the main member is a casting of the second titanium alloy integrally including the sole portion, the side portion, the hosel portion, a periphery part of the crown portion around the top opening, and a periphery part of the face portion around the front opening, the sole portion has a thickness of at least 0.65 mm, the side portion has a thickness of at least 0.65 mm, the crown member has a thickness of at most 0.60 nun, the area of the crown member is at least 50% of the area of the crown portion, and the face member has a Young's modulus Y 1 of 120 to 150 GPa and a tensile strength of 950 to 2,200 MPa.