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  Golf club head and method of fabricating striking plateUSPTO Application #: 20080102984Title: Golf club head and method of fabricating striking plate Abstract: A golf club head including a head body and a striking plate is provided. The head body has an opening. The striking plate is disposed at the opening and has a striking surface. The striking plate includes a first crystallization phase region and at least a second crystallization phase region. The second crystallization phase region is located in the first crystallization phase region. The second crystallization phase region extends from the striking surface to an interior of the striking plate. The elastic modulus of the second crystallization phase region is smaller than that of the first crystallization phase region. (end of abstract) Agent: J C Patents, Inc. - Irvine, CA, US Inventor: Ming-Jui Chiang USPTO Applicaton #: 20080102984 - Class: 473342 (USPTO) The Patent Description & Claims data below is from USPTO Patent Application 20080102984. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS-REFERENCE TO RELATED APPLICATION [0001]This application claims the priority benefit of Taiwan application serial no. 95139354, filed Oct. 25, 2006. All disclosure of the Taiwan application is incorporated herein by reference. BACKGROUND OF THE INVENTION [0002]1. Field of Invention [0003]The present invention relates to a golf club head and a method of fabricating a striking plate, and more particularly to a golf club head with a striking plate having a crystallization phase region with a low elastic modulus and a method of fabricating the striking plate. [0004]2. Description of Related Art [0005]With the prevailing of sports in today's society, golf has become one of the favorite sports widely accepted by the mass, and more and more people are participating in the golf sports. Golf clubs can be classified into wooden clubs, iron clubs, putters, and so on according to various fields and usage. [0006]As for the wooden club, the golf club head is usually fabricated by first forming a head body made of a metal material or together with carbon fiber, and then, integrating a striking plate for striking a golf ball with the head body as a whole. The golf club head has a specific specification and limitation in size and weight, so as to provide a desired controlling and striking effect when striking the golf ball. Therefore, depending upon different requirements in use, in the design of the golf club head, the basic architecture of the head body and the striking plate or the combination constitution thereof is generally changed to achieve the optimal design. [0007]The region with a high coefficient of restitution (COR) of the homogeneous and uniform striking plate is usually located in the center region, and the COR of the striking plate is gradually reduced as being far away from the center region. As far as the COR of the striking plate is concerned, the larger the region with a high COR of the striking plate of the golf club head is, the better the striking effect of the striking plate is. Therefore, in the conventional design of striking plate of the golf club head, the thickness of the plate is reduced to increase the striking restitution capability, but meanwhile the durability of the striking plate is degraded. The striking plate may be easily damaged after a long time of striking as the thickness is reduced. How to simply and effectively increase the striking restitution capability of the striking plate without degrading the durability has become an urgent problem to be solved in the design of the golf club head. SUMMARY OF THE INVENTION [0008]The present invention is directed to a gold club head, wherein the striking plate has a larger region with a high COR. [0009]The present invention is also directed to a method of fabricating the striking plate, so as to enlarge the region of the striking plate with a high COR. [0010]The present invention provides a golf club head, which comprises a head body and a striking plate. The head body has an opening. The striking plate is disposed at the opening and has a striking surface. The striking plate comprises a first crystallization phase region and at least a second crystallization phase region. The second crystallization phase region is located in the first crystallization phase region and extends from the striking surface to an interior of the striking plate. The elastic modulus of the second crystallization phase region is smaller than that of the first crystallization phase region. [0011]In an embodiment of the present invention, a crystallization phase of the first crystallization phase region includes .beta.-type or .alpha.-.beta.-type. [0012]In an embodiment of the present invention, a crystallization phase of the second crystallization phase region includes .alpha.'-type or .alpha.''-type. [0013]In an embodiment of the present invention, the elastic modulus of the first crystallization phase region may be larger than or equal to 100 GPa. [0014]In an embodiment of the present invention, an absolute value of the difference between the elastic modulus of the first crystallization phase region and that of the second crystallization phase region may be larger than or equal to 5 GPa and smaller than or equal to 10 GPa. [0015]In an embodiment of the present invention, the striking plate is made of a Ti alloy. [0016]The present invention provides a method of fabricating the striking plate, which is applicable for a golf club head. The method of fabricating the striking plate comprises the following steps. First, a plate body is provided, and a crystallization phase of the plate body is a first crystallization phase. Next, a part of the plate body is heated. Next, the heated part of the plate body is quenched, so as to make the crystallization phase of the part of the plate body be transformed into a second crystallization phase. [0017]In an embodiment of the present invention, the step of heating the part of the plate body may be achieved by irradiating the plate body with a high-energy laser beam. [0018]In an embodiment of the present invention, the step of heating the part of the plate body may be achieved by irradiating the plate body with an electron beam. [0019]In an embodiment of the present invention, the step of quenching the heated part of the plate body may be achieved by water cooling, air cooling, or furnace cooling. [0020]In an embodiment of the present invention, a cooling rate of quenching the heated part of the plate body is higher than or equal to 10.degree. C. per second. [0021]In an embodiment of the present invention, the first crystallization phase includes .beta.-type or .alpha.-.beta.-type. Continue reading... Full patent description for Golf club head and method of fabricating striking plate Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Golf club head and method of fabricating striking plate patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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