Title:
ゴルフボール
Document Type and Number:
Japanese Patent JP4031353
Kind Code:
B2
Abstract:
A golf ball comprises a large number of dimples ( 4 ) on a surface thereof. The dimple ( 4 ) includes a first curved surface ( 7 ) provided from a position (P 2 ) placed downward by 85% of a depth to a position (P 1 ) placed downward by 100% of the depth in a direction of the depth from an edge (E) and a second curved surface ( 8 ) provided from a position (P 5 ) placed downward by 20% of the depth to a position (P 3 ) placed downward by 50% of the depth in the direction of the depth from the edge (E). A percentage, to a total number of the dimples, of a number of the dimples in which a ratio (R 1 /R 2 ) of a radius of curvature (R 1 ) of the first curved surface ( 7 ) to a radius of curvature (R 2 ) of the second curved surface ( 8 ) is 5 to 55 is 20% or more. A third curved surface ( 9 ) is present between the first curved surface ( 7 ) and the second curved surface ( 8 ). A fourth curved surface ( 10 ) is present between the second curved surface ( 8 ) and the edge (E). A distance (F) between the deepest portion (P 2 ) of the dimple ( 4 ) and a phantom sphere ( 6 ) is 0.10 mm to 0.60 mm.
Inventors:
Takahiro Sajima
Seiichiro Endo
Seiichiro Endo
Application Number:
JP2002332589A
Publication Date:
January 09, 2008
Filing Date:
November 15, 2002
Export Citation:
Assignee:
sri sports corporation
International Classes:
A63B37/00
Domestic Patent References:
| JP60096272A | ||||
| JP62192181A |
Attorney, Agent or Firm:
Kengo Oka