Multi-piece solid golf ball

摘要

A golf ball has a core, an envelope layer, an intermediate layer and a cover whose respective surface hardnesses have been set so as to satisfy certain specific relationships. In addition, the respective initial velocities measured for the core, a sphere composed of the core peripherally covered by the envelope layer (envelope layer-encased sphere), a sphere composed of the core peripherally covered by the envelope layer and the intermediate layer (intermediate layer-encased sphere), and the ball itself have been set so as to satisfy certain specific relationships. This golf ball is able to exhibit an excellent flight performance not only when struck by mid head-speed golfers, but even when struck by low head-speed golfers, in addition to which it also has a good feel at impact and an excellent durability to repeated impact.

主权项

1. A multi-piece solid golf ball comprising a core, an envelope layer, an intermediate layer and a cover, wherein the core, the envelope layer, the intermediate layer and the cover have respective surface hardnesses which satisfy the relationship:
core surface hardness>envelope layer surface hardness −40≦(envelope layer surface hardness−core surface hardness)≦−5;the core and the ball have respective initial velocities which satisfy the relationship:
−0.6 m/s≦(ball initial velocity−core initial velocity)≦0 m/s;a sphere composed of the core covered peripherally by the envelope layer and the intermediate layer (intermediate layer-encased sphere) and the ball have respective initial velocities which satisfy the relationship:
−0.4 m/s≦(ball initial velocity−intermediate layer-encased sphere initial velocity)≦0.4 m/s; and a sphere composed of the core covered peripherally by the envelope layer (envelope layer-encased sphere) and the intermediate layer-encased sphere have respective initial velocities which satisfy the relationship:
−0.2 m/s≦(intermediate layer-encased sphere initial velocity−envelope layer-encased sphere initial velocity).