Patent ID: 7137905
Filing Date: 2006-11-21
Classification: A63B

Abstract:
1. A wood-type golf club head, which comprises: a face portion forming a hitting face hitting a ball; a crown portion extending from an upper edge of the hitting face and forming an upper surface of the head; a sole portion extending from a lower edge of the hitting face and forming a bottom surface of the head; a side portion extending between the crown portion and the sole portion from a toe side edge of the hitting face to a heel side edge of the hitting face through a back face; and a neck portion formed with a shaft insertion hole to which one end of a shaft is attached, wherein in a measuring state where an axial center line of the shaft insertion hole is arranged in a vertical plane and is inclined at a lie angle β determined in accordance with the head, and a face angle is set to zero, a point at which the axial center line of the shaft insertion hole crosses a virtual plane passing through an upper end surface of the neck portion is set to an origin O, and a two-dimensional X-Y coordinate in which a Y-axis is a nodal line between the horizontal plane and the vertical plane, and an X-axis is an axis line passing through the origin O and being perpendicular to the Y-axis is virtually set on the horizontal plane passing through the origin O, and in the case where the maximum value of the Y-axis in a profile line of the head projected on the X-Y coordinate system is set to ym and the maximum value of the X-axis is set to xm, a weight member having a great specific gravity is firmly attached to the sole portion in an area where a center of gravity of the weight member is set to 0.2 to 0.7 times of the xm value in the X-coordinate and set to 0.1 to 0.5 times of the ym value in the Y-coordinate, wherein the specific gravity is in the range of from 6.0 to 25.0, the weight member is mounted in a concave portion formed on the sole portion, and the golf club head satisfies the following three conditions in a moment M of inertia around a center line of a shaft axis (g·cm