Golf club shaft
View Patent ↗A shaft full length is defined as Ls and a distance between a tip end of the shaft and a center of gravity G of the shaft is defined as Lg. In a shaft 6 , Lg/Ls is 0.54 or greater and 0.65 or less. A shaft weight Ws is 50 g or greater and 85 g or less. The shaft 6 has at least three bias layer pairs. One bias layer pair of the three bias layer pairs is a pitch-containing bias layer pair having a pitch based carbon fiber. Two bias layer pairs of the three bias layer pairs are PAN-containing bias layer pairs having a PAN based carbon fiber. Preferably, the PAN-containing bias layer pairs are located outside and inside the pitch-containing bias layer pair.
1. A golf club shaft, wherein when a shaft full length is defined as Ls and a distance between a tip end of the shaft and a center of gravity G of the shaft is defined as Lg, Lg/Ls is 0.54 or greater and 0.65 or less;
a shaft weight Ws is 50 g or greater and 85 g or less;
the golf club shaft has at least three bias layer pairs;
one bias layer pair of the three bias layer pairs is a pitch-containing bias layer pair having a pitch based carbon fiber; and
two bias layer pairs of the three bias layer pairs are PAN-containing bias layer pairs having a PAN based carbon fiber.
2. The golf club shaft according to claim 1 , wherein the PAN-containing bias layer pairs are located outside and inside the pitch-containing bias layer pair.
3. The golf club shaft according to claim 2 , wherein the three bias layer pairs are brought into contact with each other.
4. The golf club shaft according to claim 1 , wherein the one bias layer pair of the three bias layer pairs is a butt partial layer.
5. The golf club shaft according to claim 4 , wherein the butt partial layer is the PAN-containing bias layer pair.
6. The golf club shaft according to claim 5 , wherein the three bias layer pairs are brought into contact with each other.
7. The golf club shaft according to claim 4 , wherein the two bias layer pairs of the three bias layer pairs are full length layers.
8. The golf club shaft according to claim 7 , wherein the three bias layer pairs are brought into contact with each other.
9. The golf club shaft according to claim 7 , wherein the number of the bias layer pairs is 3.
10. The golf club shaft according to claim 7 , wherein the golf club shaft has one or more full length PAN-containing bias layer pairs and one or more full length pitch-containing bias layer pairs.
11. The golf club shaft according to claim 4 , wherein the three bias layer pairs are brought into contact with each other.
12. The golf club shaft according to claim 4 , wherein a distance L 2 between a tip side end position of the butt partial layer and a butt end of the shaft is 300 mm or greater and 550 mm or less.
13. The golf club shaft according to claim 1 , wherein the three bias layer pairs are brought into contact with each other.
14. The golf club shaft according to claim 1 , wherein when a GI value in a point separated by 890 mm from the tip end of the shaft is defined as GIb, GIb is 24 N·m 2 or greater and 59 N·m 2 or less.
15. The golf club shaft according to claim 1 , wherein when a GI value in a point separated by 90 mm from the tip end of the shaft is defined as GIt, GIt is 5.4 N·m 2 or greater and 8.8 N·m 2 or less.
16. The golf club shaft according to claim 1 , wherein when a GI value in a point separated by 890 mm from the tip end of the shaft is defined as GIb, and a GI value in a point separated by 90 mm from the tip end of the shaft is defined as GIt,
GIb/GIt is 5 or greater and 9 or less.