Patent ID: 6475099
Filing Date: 2002-11-05
Classification: A63B,Y10T

Abstract:
A golf club head comprising a ball striking face having a loft angle of from 6 to 30 degrees, and having a depth of the gravity center of not less than 18 mm,said ball striking face provided with a region adjusted to decrease spin of a hit golf ball such that a maximum static friction coefficient of said region is set in a range of not less than 0.35 but not more than 0.6, said maximum static friction coefficient being the quotient of a maximum force required to move a golf ball relatively to the ball striking face at a speed of 50 mm/minute in a direction parallel to the ball striking face when the golf ball is relatively pressed against the ball striking face at a load of 400 kgf normally to the ball striking face, divided by the load of 400 kgf, wherein said golf ball is a two-piece ball having a core made of polybutadiene rubber and an outer cover made of ionomer resin of 2.3 mm in thickness coated with urethane paint, and the golf ball has a contact area of substantially 300 sq.mm with the ball striking face when the load of 400 kgf is applied.