| 摘要 |
<p>PURPOSE:To sort accurately golf balls while providing them having the same carry performance and durability as normal golf balls, by embedding a lump of specified vol.% aluminum or aluminum alloy in the center of the ball. CONSTITUTION:A lump 1 containing 1.5X10<-4>-35vol.% aluminum or aluminum alloy is embedded in the center of a ball. If the lump 1 contains under 1.5X10<-4>vol.% aluminum or aluminum alloy, satisfactory detecting sensitivity is not provided. On the other hand, if the lump contains over 35vol.% aluminum or aluminum alloy, the weight of the whole ball is sometimes too much heavy to fall within 45.93g of the standard of authorized ball. Such a ball is not preferable for a training ball. Further, it degrades a feeling in shot and the moment of inertia differs remarkably from that of ordinary golf balls so that the satisfactory carry performance is not obtained. The preferable vol.% of the aluminum or aluminum alloy in the lump is 0.01-0.5vol.%.</p> |
