Golf club head
View Patent ↗A golf club head with a vibration absorber capable of absorbing unpleasant vibrations on off-center hits without absorbing agreeable vibrations on on-center hits is disclosed. The head comprises a head main body made of a metal material, and a vibration absorber made of a visco-elastic material attached to the head main body, wherein the loss tangent of the vibration absorber exhibits its maximum value within a temperature range of −20 to 50 deg.C., the loss tangent at 30 deg.C. is not less than 0.30, and the loss tangent at −40 deg.C. is less than 0.20.
1. A golf club head comprising
a head main body made of a metal material, and
a vibration absorber made of a visco-elastic material attached to the head main body, wherein
the loss tangent of the vibration absorber exhibits its maximum value within a temperature range of −5 to 30 deg.C.,
the loss tangent at 30 deg.C. is not less than 0.50,
the loss tangent at −40 deg.C. is not more than 0.10, and
a difference of the loss tangent at 30 deg.C. from the loss tangent at −40 deg.C. is in a range of not less than 0.20 and not more than 0.70.
2. The golf club head according to claim 1 , wherein the volume of the vibration absorber is in a range of 0.4 to 3.0 cc.
3. The golf club head according to claim 1 , wherein the contact area between the vibration absorber and the head main body is in a range of 1.0 to 60.0 sq.cm.
4. The golf club head according to claim 1 , wherein said visco-elastic material is 3,4-polyisoprene rubber.
5. The golf club head according to claim 1 , wherein the vibration absorber is a sheet of the visco-elastic material having a substantially constant thickness, and fixed to the backside of a face portion by means of an adhesive agent.
6. A golf club head comprising
a head main body made of a metal material, and
a vibration absorber made of a visco-elastic material attached to the head main body, wherein
the loss tangent of the vibration absorber exhibits its maximum value within a temperature range of −5 to 30 deg.C.,
the loss tangent at 30 deg.C. is not less than 0.50,
the loss tangent at −40 deg.C. is not more than 0.10,
a difference of the loss tangent at 30 deg.C. from the loss tangent at −40 deg.C. is in a range of not less than 0.20 and not more than 0.70,
the vibration absorber is a sheet of 3,4-polyisoprene rubber having a substantially constant thickness and fixed to the backside of a face portion by means of an adhesive agent,
the volume of the vibration absorber is in a range of 0.4 to 3.0 cc, and
the contact area between the vibration absorber and the head main body is in a range of 1.0 to 60.0 sq.cm.