Groove depths D 1 of clubs are defined as D 1 ( 1 ), D 1 ( 2 ), . . . , D 1 ( n ) in an order from the club having the smallest real loft angle L 1 , and groove widths W 1 of face lines of the clubs measured by the 30 degree method of measurement are defined as W 1 ( 1 ), W 1 ( 2 ), . . . , W 1 ( n ) in an order from the club having the smallest real loft angle L 1 . At this time, a golf club set satisfies D 1 ( 1 )≦D 1 ( 2 )≦ . . . ≦D 1 ( n ). A ratio [D 1 (m)/D 1 ( m −1)] of the groove depths D 1 between two golf clubs with adjacent club numbers is 1.0 or greater and 3.0 or less. The golf club set satisfies W 1 ( 1 )≦W 1 ( 2 )≦ . . . ≦W 1 ( n ). A ratio [W 1 (m)/W 1 ( m −1)] of the groove widths W 1 between two golf clubs with adjacent club numbers is 1.0 or greater and 3.0 or less.
1. A golf club set comprising n pieces of golf clubs (n is an integer of equal to or greater than 3), wherein
when groove depths D 1 of face lines of the clubs are defined as D 1 ( 1 ), D 1 ( 2 ), . . . , D 1 ( n ) in an order from the club having the smallest real loft angle L 1 ; and groove widths W 1 of the face lines of the clubs measured by the 30 degree method of measurement are defined as W 1 ( 1 ), W 1 ( 2 ), . . . , W 1 ( n ) in an order from the club having the smallest real loft angle L 1 , D 1 ( 1 )≦D 1 ( 2 )≦ . . . ≦D 1 ( n ) and D 1 ( 1 )<D 1 ( n ) are satisfied; the groove depths D 1 of all the clubs are 0.0 (mm) or greater and 0.508 (mm) or less; a ratio [D 1 ( m )/D 1 ( m− 1)] of the groove depths D 1 between two golf clubs with adjacent club numbers in all the clubs is 1.0 or greater and 3.0 or less;
W 1 ( 1 )≦W 1 ( 2 )≦ . . . ≦W 1 ( n ) and W 1 ( 1 )<W 1 ( n ) are satisfied; the groove widths W 1 of all the clubs are 0.0 (mm) or greater and 0.889 (mm) or less; and a ratio [W 1 ( m )/W 1 ( m− 1)] of the groove widths W 1 between two golf clubs with adjacent club numbers in all the clubs is 1.0 or greater and 3.0 or less, and
a roundness of curvature radius R 1 is applied to the edges of face lines in the clubs, the curvature radius R 1 being equal to or greater than 0.10 mm and equal to or less than 0.50 mm,
wherein the golf club set comprises a golf club having a real loft angle L 1 of equal to or less than 40 degrees and a golf club having a real loft angle L 1 exceeding 40 degrees and a golf club having a real loft angle L 1 of equal to or greater than 50 degrees;
wherein when a groove depth D 1 of a club having the greatest real loft angle L 1 , among clubs having a real loft angle L 1 of equal to or less than 40 degrees is defined as D 1 (X), and a groove depth D 1 of a club having the smallest real loft angle L 1 , among clubs having a real loft angle L 1 of equal to or greater than 50 degrees is defined as D 1 (Y), D 1 (X)<D 1 (Y) is satisfied, wherein the groove depths D 1 in club numbers having a real loft angle L 1 of equal to or greater than 20 degrees and equal to or less than 39 degrees are constant and groove depths D 1 in club numbers having a real loft angle L 1 of equal to or greater than 44 degrees and equal to or less than 56 degrees are constant.
2. The golf club set according to claim 1 , wherein when groove bottom widths W 2 are defined as W 2 ( 1 ), W 2 ( 2 ), . . . , W 2 ( n ) in an order from the club having the smallest real loft angle L 1 , W 2 ( 1 )≦W 2 ( 2 )≦ . . . ≦W 2 ( n ) and W 2 ( 1 )<W 2 ( n ) are satisfied;
the groove bottom widths W 2 of all the clubs are 0.0 (mm) or greater and 1.0 (mm) or less; and
a ratio [W 2 ( m )/W 2 ( m− 1)] of the groove bottom widths W 2 between two golf clubs with adjacent club numbers in all the clubs is 1.0 or greater and 3.0 or less.
3. The golf club set according to claim 1 , wherein a ratio [D 1 ( n )/D 1 ( 1 )] is equal to or greater than 1.2, and a ratio [W 1 ( n )/W 1 ( 1 )] is equal to or greater than 1.1.
4. The golf club set according to claim 1 , wherein curvature radius R 1 of edges of the face lines are constant in all the clubs.
5. The golf club set according to claim 1 , wherein when curvature radius R 1 of edges of the face lines are defined as R 1 ( 1 ), R 1 ( 2 ), . . . , R 1 ( n ) in an order from the club having the smallest real loft angle L 1 , R 1 ( 1 )≧R 1 ( 2 )≧ . . . ≧R 1 ( n ) and R 1 ( 1 )>R 1 ( n ) are satisfied.
6. The golf club set according to claim 1 , wherein the face lines are produced by forging, press processing, casting or cutting processing.
7. The golf club set according to claim 1 , wherein the golf club set comprises a golf club having a real loft angle L 1 of equal to or less than 40 degrees and a golf club having a real loft angle L 1 exceeding 50 degrees.
8. The golf club set according to claim 1 , wherein the number n of the clubs is equal to or greater than 6.
9. The golf club set according to claim 1 , wherein all the sides of the face lines are set to curved surfaces in all club numbers.
10. A golf club set comprising n pieces of golf clubs (n is an integer of equal to or greater than 3), wherein
when groove depths D 1 of face lines of the clubs are defined as D 1 ( 1 ), D 1 ( 2 ), . . . , D 1 ( n ) in an order from the club having the smallest real loft angle L 1 ; and groove widths W 1 of the face lines of the clubs measured by the 30 degree method of measurement are defined as W 1 ( 1 ), W 1 ( 2 ), . . . , W 1 ( n ) in an order from the club having the smallest real loft angle L 1 , D 1 ( 1 )≦D 1 ( 2 )≦ . . . ≦D 1 ( n ) and D 1 ( 1 )<D 1 ( n ) are satisfied; the groove depths D 1 of all the clubs are 0.0 (mm) or greater and 0.508 (mm) or less; a ratio [D 1 ( m )/D 1 ( m− 1)] of the groove depths D 1 between two golf clubs with adjacent club numbers in all the clubs is 1.0 or greater and 3.0 or less;
W 1 ( 1 )≦W 1 ( 2 )≦ . . . ≦W(n) and W 1 ( 1 )<W 1 ( n ) are satisfied; the groove widths W 1 of all the clubs are 0.0 (mm) or greater and 0.889 (mm) or less; and a ratio [W 1 ( m )/W 1 ( m− 1)] of the groove widths W 1 between two golf clubs with adjacent club numbers in all the clubs is 1.0 or greater and 3.0 or less, and
a roundness of curvature radius R 1 is applied to the edges of face lines in the clubs, the curvature radius R 1 being equal to or greater than 0.10 mm and equal to or less than 0.50 mm,
wherein the golf club set comprises a golf club having a real loft angle L 1 of equal to or less than 40 degrees and a golf club having a real loft angle L 1 exceeding 40 degrees and a golf club having a real loft angle L 1 of equal to or greater than 50 degrees;
wherein when a groove width W 1 of a club having the greatest real loft angle L 1 , among clubs having a real loft angle L 1 of equal to or less than 40 degrees is defined as W 1 (X), and a groove width W 1 of a club having the smallest real loft angle L 1 , among clubs having a real loft angle L 1 of equal to or greater than 50 degrees is defined as W 1 (Y), W 1 (X)<W 1 (Y) is satisfied, wherein the groove depths D 1 in club numbers having a real loft angle L 1 of equal to or greater than 20 degrees and equal to or less than 39 degrees are constant and groove depths D 1 in club numbers having a real loft angle L 1 of equal to or greater than 44 degrees and equal to or less than 56 degrees are constant.
11. The golf club set according to claim 10 , wherein all the sides of the face lines are set to curved surfaces in all club numbers.