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Golf club head

  • US 20050215352A1
  • Filed: 02/07/2005
  • Published: 09/29/2005
  • Est. Priority Date: 03/23/2004
  • Status: Active Grant
First Claim
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1. A hollow golf club head comprising:

  • a metal member made of at least one kind of metal material having at least one opening in a crown portion thereof; and

    a FRP member made of a fiber reinforced resin attached to the metal member so as to cover the opening, the fiber reinforced resin formed from a plurality of prepreg plies each having a magnitude covering the opening, and the prepreg plies comprising a plurality of unidirectional plies each having fibers aligned along an unidirection, wherein the unidirectional plies comprise at least “

    n”

    kinds of (in this case, “

    n”

    is an integral number not less than 3 and not more than

         6) plies which are laminated in a state in which directions of the fibers are differentiated, and in a standard condition of being grounded on a horizontal plane at prescribed lie angle and loft angle, the directions of the fibers of the “

    n”

    kind of unidirectional plies seeing through a plane intersect at an angle (180/n) degrees obtained by substantially dividing 180 degrees by the integral number n in the crown portion.

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