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Golf club head

  • US 7,137,906 B2
  • Filed: 12/18/2002
  • Issued: 11/21/2006
  • Est. Priority Date: 12/28/2001
  • Status: Active Grant
First Claim
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1. A golf club head havinga face portion,a crown portion forming a head upper surface, anda sole portion forming a head bottom surface, and whereina thickness of the face portion is not more than 2.7 mm,a thickness of the crown portion is not more than 0.9 mm,a thickness of the sole portion is not more than 1.0 mm, andthe head, when mounted on a horizontal surface to have a set lie angle and face angle, with a vertical cross section passing through a center of the face portion and being perpendicular to the face surface and said horizontal surface, has (1) a smallest radius of curvature of an outer surface in the crown portion of not less than 500 mm, measured at the vertical cross section, and (2) a smallest radius of curvature of an outer surface in the sole portion of not less than 1000 mm, measured at the vertical cross section, and whereina frequency F (fix) indicating a primary minimum value of a frequency transfer function of a head obtained by firmly fixing the head to a vibrator and measured in accordance with a vibrator method is between 600 and 1200 Hz, a frequency F (free) indicating a primary minimum value of a frequency transfer function of the head obtained by placing the head in a free state and measured in accordance with an impact hammer method is between 2500 and 4000 Hz, and a ratio F (free)/F (fix) between said frequency F (fix) and said frequency F (free) is between 4.2 and 6.0.

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