US2018169482A1PendingUtilityA1

Golf ball

44
Assignee: DUNLOP SPORTS CO LTDPriority: Dec 19, 2016Filed: Nov 15, 2017Published: Jun 21, 2018
Est. expiryDec 19, 2036(~10.4 yrs left)· nominal 20-yr term from priority
Inventors:Takahiro SajimaHironori Takihara
A63B 37/0088A63B 37/0087A63B 37/0031A63B 37/0033A63B 37/0065A63B 37/0074A63B 2037/0079
44
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Claims

Abstract

A golf ball includes a core and a cover. A difference (FB 2 −FC 2 ) between a secondary natural frequency FB 2 of the golf ball and a secondary natural frequency FC 2 of the core is not less than 80 Hz and not greater than 420 Hz. The golf ball having a sum (FB 2 +FC 2 ) of not less than 4000 Hz is preferable. Preferably, the FC 2 is not less than 1800 Hz and not greater than 2500 Hz. Preferably, the FB 2 is not less than 2000 Hz and not greater than 2800 Hz. Preferably, an amount of compressive deformation Dc is 2.30 mm to 3.90 mm. Preferably, an amount of compressive deformation Db is 1.80 mm to 3.30 mm. Preferably, a thickness Tc is 0.80 mm to 2.10 mm. Preferably, a Shore D hardness Hc is not less than 52 and not greater than 65.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
         1 . A golf ball comprising a core and a cover positioned outside the core, wherein
 when a secondary natural frequency of the golf ball is FB 2  and a secondary natural frequency of the core is FC 2 , a difference (FB 2 −FC 2 ) is not less than 80 Hz and not greater than 420 Hz.   
     
     
         2 . The golf ball according to  claim 1 , wherein a sum (FB 2 +FC 2 ) of the FB 2  and the FC 2  is not less than 4000 Hz. 
     
     
         3 . The golf ball according to  claim 1 , wherein the FC 2  is not less than 1800 Hz and not greater than 2500 Hz. 
     
     
         4 . The golf ball according to  claim 1 , wherein the FB 2  is not less than 2000 Hz and not greater than 2800 Hz. 
     
     
         5 . The golf ball according to  claim 1 , wherein the core has an amount of compressive deformation Dc of not less than 2.30 mm and not greater than 3.90 mm. 
     
     
         6 . The golf ball according to  claim 1 , wherein the golf ball has an amount of compressive deformation Db of not less than 1.80 mm and not greater than 3.30 mm. 
     
     
         7 . The golf ball according to  claim 1 , wherein the cover has a thickness Tc of not less than 0.80 mm and not greater than 2.10 mm. 
     
     
         8 . The golf ball according to  claim 1 , wherein the cover has a Shore D hardness Hc of not less than 52 and not greater than 65.

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