Title:
ゴルフボール
Document Type and Number:
Japanese Patent JP4489456
Kind Code:
B2
Abstract:
Golf ball has a core, a cover, and numerous dimples 12 formed on the surface of this cover. Principal component of the cover is a polyurethane elastomer. This cover has a Shore D hardness of 30 or greater and 55 or less. Occupation ratio Y of total area of the dimples 12 to surface area of a phantom sphere is equal to or greater than 75%. Proportion of the number NL of the dimples 12 having a diameter of equal to or greater than 3.90 mm to total number N of the dimples 12 is equal to or greater than 75%. Proportion of the number ML of dimples having a diameter of equal to or greater than 3.90 mm, having (Re/Rw) of 0.5 or greater and 1.5 or less, and having Re of 2.0 mm or greater and 5.0 mm or less to the number NL is equal to or greater than 50%.
Inventors:
Takashi Sasaki
Takahiro Sajima
Takahiro Sajima
Application Number:
JP2004045597A
Publication Date:
June 23, 2010
Filing Date:
February 23, 2004
Export Citation:
Assignee:
sri sports corporation
International Classes:
A63B37/00; A63B37/04; A63B37/14; A63B37/12
Domestic Patent References:
| JP62192181A | ||||
| JP11089967A | ||||
| JP9070449A | ||||
| JP2002191721A | ||||
| JP2000225211A | ||||
| JP4212385A | ||||
| JP5360965U | ||||
| JP5237202A | ||||
| JP2002331045A |
Foreign References:
| US5470076 |
Attorney, Agent or Firm:
Kengo Oka