US2018056136A1PendingUtilityA1

Golf ball

44
Assignee: DUNLOP SPORTS CO LTDPriority: Aug 29, 2016Filed: Jul 14, 2017Published: Mar 1, 2018
Est. expiryAug 29, 2036(~10.1 yrs left)· nominal 20-yr term from priority
Inventors:Kohei MimuraTakahiro Sajima
A63B 37/0005A63B 37/002A63B 37/0019A63B 37/0012A63B 37/0018A63B 37/0022A63B 37/0006
44
PatentIndex Score
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Claims

Abstract

A golf ball 2 has a plurality of dimples 12 and a land 14 on a surface thereof. The golf ball 2 further has a large number of minute projections 18 formed on surfaces of the dimples 12 and the land 14 . An average depth Fav of the dimples 12 and an average height Hav of the minute projections 18 satisfy the following mathematical formula (1). Hav<Fav *0.05  (1) An average value Pav of pitches P between the minute projections 18 and other minute projections 18 adjacent to the minute projections 18 is not less than 10 μm and not greater than 2000 μm.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
         1 . A golf ball having a plurality of dimples and a land, wherein
 the golf ball further has a large number of minute projections formed on surfaces of the dimples and/or the land, and   an average depth Fav of the dimples and an average height Hav of the minute projections satisfy the following mathematical formula (1):
     Hav<Fav* 0.05  (1).
 
   
     
     
         2 . The golf ball according to  claim 1 , wherein an average value Pav of pitches P between the minute projections and other minute projections adjacent to the minute projections is not less than 10 μm and not greater than 2000 μm. 
     
     
         3 . The golf ball according to  claim 1 , wherein the golf ball has a plurality of rows in each of which a plurality of minute projections are aligned at equal pitches. 
     
     
         4 . The golf ball according to  claim 1 , wherein an average area Sav of the dimples and an average area Qav of bottom surfaces of the minute projections satisfy the following mathematical formula (2):
     Qav<Sav* 0.016  (2).
   
     
     
         5 . The golf ball according to  claim 1 , wherein
 the golf ball includes a main body and a paint layer positioned outside the main body, and   the minute projections each have a shape in which a surface shape of the main body is reflected.   
     
     
         6 . The golf ball according to  claim 1 , wherein an average value Lay of distances between the minute projections and other minute projections adjacent to the minute projections is not less than 5 μm and not greater than 1500 μm. 
     
     
         7 . The golf ball according to  claim 1 , wherein the average height Hav of the minute projections is not less than 0.5 μm and not greater than 25 μm. 
     
     
         8 . The golf ball according to  claim 1 , wherein a total number of the minute projections is not less than 500 and not greater than 500000.

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