Multi-layer golf ball and method of manufacturing

DETAILED DESCRIPTION The present invention relates to a golf ball which consists of a core surrounded by a cover.
The cover has a multi-layered structure which comprises at least three layers, and preferably more than three layers.
Each of the layers have different hardness characteristics so as to provide a variation of hardness to the multi-sheet structure.
Preferably, each layer is a thin layer having a thickness of less than or equal to 0.
030 inches.
Such a golf ball structure having at least three thin layers advantageously allows for precise hardness gradients within the ball to optimize the ball properties of rebound, spin, softness, etc.
, for each type of club that is used during the game, while also maintaining the minimum thickness of the cover to provide durability.
The preferred embodiment of the golf ball described herein produces equal or better flight performance relative to prior art balls when struck by a driver.
This golf ball also exhibits improved characteristics in controllability and feel when struck by a middle iron, short iron or putter.
In accordance with the present invention, the size and hardness of the thin layers of the multi-layered structure may be varied depending upon the various needs of the players.
Preferably, the hardness varies from one layer to another adjacent layer to provide a gradual change of hardness within the multi-layered structure.
This provides the manufacturer with increased ability to tune the properties of the cover toward the various clubs depending upon the deformation to which the cover is subjected.
In one embodiment, the hardness within the multi-sheet structure gradually decreases from the innermost layer to the outermost layer.
When a driver strikes the ball, the cover deforms until the club face deforms an inner layer harder than the outer layers to thereby impart a solid rebound to the ball.
When a short iron strikes the ball, the club face only deforms the outer softer layers to confer more spin and a good feel to the ball.
In another embodiment, the hardness of each layer increases gradually from the innermost layer to the outer layers