Golf club head having a surface-modified structure and a surface modifying method therefor

Abstract

A golf club head includes a golf club head body and a striking plate. A surface of the golf club head body and the striking plate has at least one surface-modified portion processed by a high-energy treating apparatus that has a luminous energy adjustment device. A defocused high-energy beam generated from the high-energy treating apparatus penetrates through the luminous energy adjustment device and projects on a predetermined portion of the golf club head that possesses different mechanical characteristics than other portions. A surface modifying method for the golf club head include the steps of: providing a high-energy treating apparatus with a luminous energy adjustment device; and projecting a defocused high-energy beam transmitted from the luminous energy adjustment device on the predetermined portion of the golf club head to form at least one surface-modified portion.

1 . A golf club head having a surface-modified structure comprising: 
 a golf club head body at least including a crown portion, a sole portion, a skirt portion, a rear portion and a neck portion, the golf club head body having an inner surface and an outer surface;    a striking plate having an inner surface and an outer surface; and    at least one surface-modified portion provided on one of the golf club head body and the striking plate;    wherein the surface-modified portion is treated by a defocused high-energy beam which penetrates through a luminous energy adjustment device of a high-energy treating apparatus such that the surface-modified portion possesses a higher degree of the hardness than other portions.    
   
   
       2 . The golf club head as defined in  claim 1 , wherein the surface-modified portion is provided on a greater elastically deformable region of the striking plate.  
   
   
       3 . The golf club head as defined in  claim 1 , wherein the surface-modified portion is in circular form.  
   
   
       4 . The golf club head as defined in  claim 1 , wherein the surface-modified portion is in ring form.  
   
   
       5 . The golf club head as defined in  claim 1 , wherein the defocused high-energy beam has a penetrating depth not greater than 1.5 mm while the defocused high-energy beam only treating one of the outer surfaces of the golf club head body and the striking plate.  
   
   
       6 . The golf club head as defined in  claim 1 , wherein the surface-modified portion is provided on one of the inner surfaces of the golf club head body and the striking plate by the defocused high-energy beam treating the selected inner surface.  
   
   
       7 . The golf club head as defined in  claim 6 , wherein the defocused high-energy beam has a penetrating depth substantially not greater than 1.0 mm.  
   
   
       8 . The golf club head as defined in  claim 1 , wherein the high-energy treating apparatus is selected from a plasma device or a laser device.  
   
   
       9 . The golf club head as defined in  claim 1 , wherein the luminous energy adjustment device is selected from an integral lens.  
   
   
       10 . The golf club head as defined in  claim 1 , wherein the surface-modified portion is provided on a stress-concentrated region of the golf club head.  
   
   
       11 . The golf club head as defined in  claim 1 , wherein the golf club head body and the striking plate are integrally formed  
   
   
       12 . The golf club head as defined in  claim 1 , wherein the surface-modified portion is provided on a thin wall of one of the golf club head body and the striking plate.  
   
   
       13 . A surface modifying method for a golf club head, comprising the steps of: 
 providing a high-energy treating apparatus with a luminous energy adjustment device;    preparing a defocused high-energy beam of the high-energy treating apparatus; and    projecting the defocused high-energy beam transmitted from the luminous energy adjustment device on a predetermined portion of the golf club head to form at least one surface-modified portion.    
   
   
       14 . The surface modifying method as defined in  claim 13 , wherein the surface-modified portion is provided on a thin wall of one of a golf club head body and a striking plate.  
   
   
       15 . The surface modifying method as defined in  claim 13 , wherein the defocused high-energy beam is used to treat an outer surface of the golf club head.  
   
   
       16 . The surface modifying method as defined in  claim 13 , wherein the defocused high-energy beam has a penetrating depth not greater than 1.5 mm while the defocused high-energy beam treating an outer surface of the golf club head.  
   
   
       17 . The surface modifying method as defined in  claim 13 , wherein the surface-modified portion is provided on an inner surface of the golf club head by the defocused high-energy beam treating the inner surface.  
   
   
       18 . The surface modifying method as defined in  claim 17 , wherein the defocused high-energy beam has a penetrating depth substantially not greater than 1.0 mm.  
   
   
       19 . The surface modifying method as defined in  claim 13 , wherein the high-energy treating apparatus is selected from a plasma device or a laser device.  
   
   
       20 . The surface modifying method as defined in  claim 13 , wherein the luminous energy adjustment device is selected from an integral lens.  
   
   
       21 . The surface modifying method as defined in  claim 13 , wherein the high-energy beam is defocused by means of positive or negative defocus.