METHOD OF IDENTIFYING AN ANTINODE OF A PRIMARY VIBRATION MODE OF A GOLF CLUB HEAD

• US 20090240479A1
• Filed: 04/03/2009
• Published: 09/24/2009
• Est. Priority Date: 12/26/2005
• Status: Active Grant

• Current Assignee: Bridgestone Sports Co Limited (Bridgestone Corporation)
• Original Assignee: Bridgestone Sports Co Limited (Bridgestone Corporation)
• Inventors: MATSUNAGA, Hideo, Shimazaki, Hideo, Ban, Wataru
• Granted Patent: US 8,126,687 B2
• Time in Patent Office: Days
• US Class Current: 703/2
• CPC Class Codes: A63B 53/0416 Heads having an impact surface provided by a face insert
• CPC Class Codes: A63B 53/0433 with special sole configurations
• CPC Class Codes: A63B 53/0437 with special crown configurations
• CPC Class Codes: A63B 53/0462 characterised by tapering thickness of the impact face plate
• CPC Class Codes: A63B 53/0466 wood-type
• CPC Class Codes: A63B 60/54 with means for damping vibrations

Abstract

This invention provides a method of identifying an antinode of a primary vibration mode of the golf club head having a hollow golf club head having a face portion, a crown portion, a sole portion, and a side portion. A viscoelastic body is to be mounted in at least one of the face portion, crown portion, sole portion, and side portion. The viscoelastic body is mounted in a part of a portion where the viscoelastic body is to be mounted, the part corresponding to an antinode of a primary vibration mode.

Claims

1. A method of identifying a position on a portion of golf club head having a face portion, a crown portion, a sole portion, and a side portion, corresponding to an antinode of a primary vibration mode of the golf club head, the method comprising the steps of:

creating a three-dimensional model of the golf club head;

obtaining the frequency response function of the golf club head as a whole;

confirming a natural frequency of the golf club head using the frequency response function;

identifying a portion of the golf club head from among the face portion, the crown portion, the sole portion, and the side portion on the basis of a vibration mode in the vicinity of the natural frequency; and

identifying a poison on the identified portion of the golf club head with reference to the vibration mode.

2. The method according to claim 1, wherein said step of obtaining the frequency response function comprises:

creating a mesh model of the three-dimensional model; and

performing a vibration mode analysis of the mesh model for obtaining the frequency response function.

3. The method according to claim 1, further comprising a step of mounting a viscoelastic body on the identified portion such that the center of the viscoelastic body is located at the identified position.