Patent ID: 7108612
Filing Date: 2006-09-19
Classification: A63B

Abstract:
1. A hollow golf club head comprising a hollow head body formed from a metal and having a hole formed in the vicinity of the middle of a crown portion and a hole formed in a vicinity of the middle of a sole portion of said head body, wherein each of the holes is closed with a cover member made of a material different from said head body, a ratio (ρm/ρf) of the specific gravity ρm of said head body and the specific gravity ρf of said cover member is set equal to or greater than 1.3, the face portion of the head body is laminated with a reinforcement made of a fiber reinforced plastic, and the ratio of the face area of a portion where said reinforcement and said head body are combined to the face area of said head body is set equal to or greater than 20%.