Multiple-piece golf ball

Abstract

A multiple-piece golf ball includes a core positioned at the center of the golf ball; an intermediate layer surrounding the core; a cover further surrounding the intermediate layer; at least one high specific gravity member having a higher specific gravity than the core, the intermediate layer and the cover. The at least one high specific gravity member is arranged such that a moment of inertia of the golf ball with respect to an x-axis Ix and a moment of inertia of the golf ball with respect to a y-axis Iy are substantially the same, a moment of inertia of the golf ball with respect to a z-axis Iz is greater than Ix and Iy, and the difference between Iz and Ix or Iy is at least approximately 3. The x-axis, y-axis, and z-axis intersect orthogonally at the center of the golf ball.

Description

BACKGROUND OF THE INVENTION[0001]The present invention relates to a multiple-piece golf ball.[0002]While there are many factors that affect the distance of a golf ball, three factors, the initial velocity of the ball, the launch angle, and the spin rate are extremely important. Of these, the ball spin is an essential element in lifting the golf ball and extending its distance. However, if the spin rate is excessive, the ball can fly upward or the ball line can be short after falling, so that the distance of the ball is not extended. The spin rate is greatest at the time the ball is struck, and gradually decreases, that is, attenuates, as the ball flies.[0003]Japanese Patent Application Publication No. 2002-515808 discloses that, with the object of providing a golf ball that generates a lower spin rate for a golfer with a low level of skill, an outer layer of a golf ball includes a discrete region of a weighting material, the weighting material being visible at the exterior surface o...

AI Technical Summary

Benefits of technology

[0006]Accordingly, it is an object of the present invention to provide a multiple-piece golf ball that generates a high spin decay rate in a case in which an initial spin rate at the time that the golf ball is struck is high and generates a low spin decay rate in a case in which the initial spin rate is low, thereby increasing the travel distance of the golf ball even in both cases in which the initial spin rate is either high or low.

Problems solved by technology

These publications, however, disclose a golf ball having an increased moment of inertia to reduce the spin rate thereof, but fail to disclose the relationship between an initial spin rate and a decay rate thereof during the time the golf ball is in flight.

However, in a case in which the initial spin rate is low, generating a high spin decay rate during flight cannot increase the travel distance of the golf ball.

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