Golf club head
First Claim
1. A golf club head comprisinga main body anda crown cover disposed in a crown portion of the head,said main body comprising a crown base made of a metal material and provided with a plurality of openings,said openings gradually decreasing in the opening area from the backside to the foreside of the head, andsaid crown cover made of a material whose specific gravity is lower than said metal material, and disposed on the crown base so as to cover said openings, wherein said openings area single first opening formed in the rear of the crown base, anda plurality of second openings smaller than the first opening and formed on the front side of the first opening,the second openings each have an area of from 0.5 to 2.0 sq.cm,the number of the second openings is in a range of from 10 to 20,the first opening has an area of from 20 to 30 sq.cm, andthe centroid of the first opening is positioned on the backside of a position which is at a distance of 66% of the depth (CL) of the crown portion backwardly from the front end of the crown portion.
4 Assignments
0 Petitions
Accused Products
Abstract
A golf club head comprises a main body and a crown cover disposed in a crown portion of the head, wherein the main body comprises a crown base made of a metal material and provided with a plurality of openings gradually decreasing in the opening area from the backside to the foreside of the head, and the crown cover is made of a material such as FRP whose specific gravity is lower than the metal material, and disposed on the crown base so as to cover the openings.
71 Citations
11 Claims
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1. A golf club head comprising
a main body and a crown cover disposed in a crown portion of the head, said main body comprising a crown base made of a metal material and provided with a plurality of openings, said openings gradually decreasing in the opening area from the backside to the foreside of the head, and said crown cover made of a material whose specific gravity is lower than said metal material, and disposed on the crown base so as to cover said openings, wherein said openings are a single first opening formed in the rear of the crown base, and a plurality of second openings smaller than the first opening and formed on the front side of the first opening, the second openings each have an area of from 0.5 to 2.0 sq.cm, the number of the second openings is in a range of from 10 to 20, the first opening has an area of from 20 to 30 sq.cm, and the centroid of the first opening is positioned on the backside of a position which is at a distance of 66% of the depth (CL) of the crown portion backwardly from the front end of the crown portion.
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5. A golf club head comprising
a main body and a crown cover disposed in a crown portion of the head, said main body comprising a crown base made of a metal material and provided with a plurality of openings, said openings gradually decreasing in the opening area from the backside to the foreside of the head, and said crown cover made of a material whose specific gravity is lower than said metal material, and disposed on the crown base so as to cover said openings, wherein said openings are a single first opening formed in the rear of the crown base, and a plurality of second openings smaller than the first opening and formed on the front side of the first opening, the number of the second openings is in a range of from 10 to 20, the second openings each have an area of from 0.5 to 2.0 sq.cm, the first opening has an area of from 20 to 30 sq.cm, and the first opening is elongated in a toe-heel direction of the head and curved backward of the head so that the first opening has a front edge and a rear edge which are curved backward of the head, and the second openings are positioned on the front side of said front edge.
Specification