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Golf ball

a golf ball and ball technology, applied in the field of golf balls, can solve the problems of golf balls receiving great shock and deformation, insufficient flight distance, short run, etc., and achieve the effects of low spin rate, excellent resilience performance, and low energy loss

Inactive Publication Date: 2013-10-31
DUNLOP SPORTS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention relates to a golf ball with a specific hardness distribution and energy loss when hit. The hardness distribution is appropriate for achieving a large flight distance when hit with a driver and a low spin rate when hit with a short iron. The golf ball has excellent resilience performance, durability, and controllability. The hardness of the inner mid layer is greater than the hardness of the outer mid layer, and the hardness of the cover is less than the hardness of the inner mid layer. The thickness of the outer mid layer is equal to or greater than 0.5 mm but equal to or less than 1.6 mm. The energy loss is low when the golf ball is hit, and the hardness of the inner mid layer is greater than the hardness of the inner cover. The soft feel at impact is obtained.

Problems solved by technology

With a golf ball that achieves a high trajectory by a high spin rate, a flight distance is insufficient.
When a backspin rate is high, the run is short.
When being hit with a driver or the like, a golf ball receives great shock and deforms.
When a local load is applied to a part of the ball due to the deformation, the golf ball is broken.
However, a golf ball having a low spin rate has inferior controllability.

Method used

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Effect test

first embodiment

[0031]A golf ball 2 shown in FIG. 1 includes a spherical core 4, an inner mid layer 6 positioned outside the core 4, an outer mid layer 8 positioned outside the inner mid layer 6, a reinforcing layer 10 positioned outside the outer mid layer 8, and a cover 12 positioned outside the reinforcing layer 10. On the surface of the cover 12, a large number of dimples 14 are formed. Of the surface of the golf ball 2, a part other than the dimples 14 is a land 16. The golf ball 2 includes a paint layer and a mark layer on the external side of the cover 12, but these layers are not shown in the drawing.

[0032]The golf ball 2 has a diameter of 40 mm or greater but 45 mm or less. From the standpoint of conformity to the rules established by the United States Golf Association (USGA), the diameter is preferably equal to or greater than 42.67 mm. In light of suppression of air resistance, the diameter is preferably equal to or less than 44 mm and more preferably equal to or less than 42.80 mm. The ...

second embodiment

[0182]A golf ball 102 shown in FIG. 3 includes a spherical core 104, an inner mid layer 106 positioned outside the core 104, an outer mid layer 108 positioned outside the inner mid layer 106, a reinforcing layer 110 positioned outside the outer mid layer 108, and a cover 112 positioned outside the reinforcing layer 110. On the surface of the cover 112, a large number of dimples 114 are formed. Of the surface of the golf ball 102, a part other than the dimples 114 is a land 116. The golf ball 102 includes a paint layer and a mark layer on the external side of the cover 112, but these layers are not shown in the drawing.

[0183]The golf ball 102 has a diameter of 40 mm or greater but 45 mm or less. From the standpoint of conformity to the rules established by the United States Golf Association (USGA), the diameter is preferably equal to or greater than 42.67 mm. In light of suppression of air resistance, the diameter is preferably equal to or less than 44 mm and more preferably equal to...

third embodiment

[0256]A golf ball 202 shown in FIG. 5 includes a spherical core 204, amid layer 206 positioned outside the core 204, a reinforcing layer 208 positioned outside the mid layer 206, an inner cover 210 positioned outside the reinforcing layer 208, and an outer cover 212 positioned outside the inner cover 210. On the surface of the outer cover 212, a large number of dimples 214 are formed. Of the surface of the golf ball 202, a part other than the dimples 214 is a land 216. The golf ball 202 includes a paint layer and a mark layer on the external side of the outer cover 212, but these layers are not shown in the drawing.

[0257]The golf ball 202 has a diameter of 40 mm or greater but 45 mm or less. From the standpoint of conformity to the rules established by the United States Golf Association (USGA), the diameter is preferably equal to or greater than 42.67 mm. In light of suppression of air resistance, the diameter is preferably equal to or less than 44 mm and more preferably equal to or...

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Abstract

A golf ball 2 includes a spherical core 4, an inner mid layer 6, an outer mid layer 8, a reinforcing layer 10, and a cover 12. When distances (%) from a central point of the core 4 to nine points and JIS-C hardnesses at the nine points, which nine points are obtained by dividing a region from the central point of the core 4 to a surface of the core 4 at intervals of 12.5% of a radius of the core 4, are plotted in a graph, R2 of a linear approximation curve obtained by a least-square method is equal to or greater than 0.95. Hm1 is greater than Hm2. Hc is less than Hm1. T2 is equal to or greater than 0.5 mm but equal to or less than 1.6 mm.

Description

[0001]This application claims priority on Patent Application No. 2012-99641 filed in JAPAN on Apr. 25, 2012, Patent Application No. 2012-116542 filed in JAPAN on May 22, 2012, Patent Application No. 2012-118422 filed in JAPAN on May 24, 2012, Patent Application No. 2012-118544 filed in JAPAN on May 24, 2012, Patent Application No. 2012-124924 filed in JAPAN on May 31, 2012, and Patent Application No. 2012-124249 filed in JAPAN on May 31, 2012. The entire contents of these Japanese Patent Applications are hereby incorporated by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to golf balls. Specifically, the present invention relates to golf balls that include a solid core, a mid layer, and a cover.[0004]2. Description of the Related Art[0005]Golf players' foremost requirement for golf balls is flight performance. In particular, golf players place importance on flight performance upon a shot with a driver. Flight performance corr...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A63B37/00
CPCA63B37/0092A63B37/0054A63B37/0043A63B37/0044A63B37/0059A63B37/0063A63B37/0076
Inventor ISOGAWA, KAZUHIKOTACHIBANA, KOSUKE
Owner DUNLOP SPORTS CO LTD
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