Golf club and method of producing the same

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(11)

EP 1 287 858 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	07.01.2004 Bulletin 2004/02

(43)	Date of publication A2:
	05.03.2003 Bulletin 2003/10

(21)	Application number: 02019305.8

(22)	Date of filing: 28.08.2002

(51)	International Patent Classification (IPC)⁷: A63B 53/04

(84)	Designated Contracting States:
	AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SK TR
	Designated Extension States:
	AL LT LV MK RO SI

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Priority:

28.08.2001 JP 2001258142
09.08.2002 JP 2002232574

(71)	Applicant: MIZUNO CORPORATION
	Osaka-shi, Osaka-fu (JP)

(72)	Inventor:
	Iwata, Mototaka, c/o Mizuno Corporation Osaka-shi, Osaka (JP)

(74)	Representative: Prüfer, Lutz H., Dipl.-Phys. et al
	PRÜFER & PARTNER GbR, Patentanwälte, Harthauser Strasse 25d 81545 München 81545 München (DE)

(54)	Golf club and method of producing the same

(57) A golf club includes a head formed of metal and having a face (2) with a center (2a) having an average crystal grain size smaller at a rear side than at a front side. The face (2) as seen in cross section has a first region (7a) having a relatively large average crystal grain size and a second region (7b) having a relatively small average crystal grain size. The second region (7b) extends from the center (2a) at the rear side to a periphery (2b) at the front side.

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