Golf club head with permanent performance indicating indicia
View Patent ↗A golf club head having a face with a face center and a center face measured performance variable, which may be a characteristic time, or CT, value, a coefficient of restitution, or COR, value, or a potential smash factor. The face includes a center face permanent indicia that is indicative of the center face measured performance variable. Relationships among the permanent indicia and the face are disclosed to reduce the likelihood of distraction caused by the permanent indicia as a golfer addresses a shot. Further, the surface roughness of the permanent indicia is controlled with respect to the surface roughness of the face to reduce the impact that the permanent indicia has on the performance of the golf club head.
1. A golf club head ( 100 ) comprising:
A) a face ( 200 ) having a face center ( 250 ) and a center face measured performance variable;
B) a center face permanent indicia ( 252 ) on the face that is indicative of the center face measured performance variable; and
C) wherein the center face permanent indicia ( 252 ) has a center face permanent indicia CIELab L* value, the face ( 200 ) outside of the center face permanent indicia ( 252 ) has a face CIELab L* value, and the golf club head ( 100 ) has a volume and a loft, wherein the difference between the center face permanent indicia CIELab L* value and the face CIELab L* value is related to the volume and the loft by the equation ΔL*≦(volume)/100×(loft).
2. A golf club head ( 100 ) of claim 1 , wherein at least a portion of the face ( 200 ) has a face coating ( 290 ), and the center face permanent indicia ( 252 ) is formed in the face coating ( 290 ).
3. A golf club head ( 100 ) of claim 2 , wherein the face coating ( 290 ) is a dark diffusely reflecting surface having a chroma value of less than 1.
4. A golf club head ( 100 ) of claim 1 , wherein the difference between the center face permanent indicia CIELab L* value and the face CIELab L* value is related to the volume and the loft by the equation ΔL*≦(volume)/125×(loft).
5. A golf club head ( 100 ) of claim 1 , wherein the difference between the center face permanent indicia CIELab L* value and the face CIELab L* value is less than 25.
6. A golf club head ( 100 ) of claim 1 , wherein the face ( 200 ) has a striking surface area ( 232 ) and at least one linear face marking ( 280 ), wherein at least a portion of the at least one linear face marking ( 280 ) has a linear face marking CIELab L* value, the face CIELab L* value of the face ( 200 ) is measured outside of the center face permanent indicia ( 252 ) and the at least one linear face marking ( 280 ), and the difference between the linear face marking CIELab L* value and the face CIELab L* value is at least 30.
7. A golf club head ( 100 ) of claim 1 , wherein the center face measured performance variable is a center face COR measured upon completion of the golf club head ( 100 ), and the center face permanent indicia ( 252 ) includes numerals representing the center face COR.
8. A golf club head ( 100 ) of claim 1 , wherein the center face measured performance variable is a center face CT measured upon completion of the golf club head ( 100 ), and wherein the center face permanent indicia ( 252 ) includes numerals representing the center face CT.
9. A golf club head ( 100 ) of claim 1 , further including a first permanent indicia ( 310 ) located on a face toe portion ( 260 ) of the face ( 200 ) indicative of a first measured performance variable measured at a first face point ( 300 ) located on a face toe portion ( 260 ), wherein the face ( 200 ) has a first thickness ( 320 ) at the first face point ( 300 ), and the first permanent indicia ( 310 ) has a first indicia surface area ( 340 ).
10. A golf club head ( 100 ) of claim 9 , wherein the first face point ( 300 ) is located higher on the face ( 200 ) than the face center ( 250 ).
11. A golf club head ( 100 ) comprising:
A) a face ( 200 ) having a face center ( 250 ) and a center face measured performance variable;
B) a center face permanent indicia ( 252 ) on the face that is indicative of the center face measured performance variable; and
C) wherein golf club head ( 100 ) has a loft, the center face permanent indicia ( 252 ) has a permanent indicia surface roughness, and the face ( 200 ) has a face surface roughness and a face area, and wherein the difference between the permanent indicia surface roughness and the face surface roughness is related to the loft and the face area by the equation ΔSR≧60*(face area)/(loft), for lofts less than 25 degrees, wherein the permanent indicia surface roughness is greater than the face surface roughness.
12. A golf club head ( 100 ) of claim 11 , wherein the permanent indicia surface roughness is at least 10 μin greater than the adjacent face surface roughness.
13. A golf club head ( 100 ) of claim 11 , wherein the permanent indicia surface roughness is at least twice the adjacent face surface roughness, and the permanent indicia surface roughness is less than fifteen times the adjacent face surface roughness.
14. A golf club head ( 100 ) of claim 11 , wherein for lofts of at least 25 degrees the difference between the face surface roughness and the permanent indicia surface roughness is related to the loft and the face area by the equation ΔSR≦200*(face area)/(loft), wherein the face surface roughness is greater than the permanent indicia surface roughness.
15. A golf club head ( 100 ) of claim 11 , wherein the center face measured performance variable is a center face COR measured upon completion of the golf club head ( 100 ), and the center face permanent indicia ( 252 ) includes numerals representing the center face COR.
16. A golf club head ( 100 ) of claim 11 , wherein the center face measured performance variable is a center face CT measured upon completion of the golf club head ( 100 ), and wherein the center face permanent indicia ( 252 ) includes numerals representing the center face CT.
17. A golf club head ( 100 ) comprising:
A) a face ( 200 ) having a face center ( 250 ) and a center face measured performance variable:
B) a center face permanent indicia ( 252 ) on the face that is indicative of the center face measured performance variable;
C) a first permanent indicia ( 310 ) located on a face toe portion ( 260 ) of the face ( 200 ) indicative of a first measured performance variable measured at a first face point ( 300 ) located on a face toe portion ( 260 ), wherein the face ( 200 ) has a first thickness ( 320 ) at the first face point ( 300 ), and the first permanent indicia ( 310 ) has a first indicia surface area ( 340 ); and
D) wherein the golf club head ( 100 ) includes:
(i) a bore having a center that defines a shaft axis (SA) which intersects with a horizontal ground plane (GP) to define an origin point and establish a vertical shaft axis plane (SAP); and
(ii) a center of gravity (CG) located:
(i) vertically from the origin point a distance Ycg;
(ii) horizontally from the origin point a distance Xcg that parallel to the shaft axis plane (SAP) and the ground plane (GP); and
(iii) a distance Zcg from the origin in a direction orthogonal to the shaft axis plane (SAP);
(iii) wherein the face ( 200 ) has a face perimeter ( 210 ) and a shortest distance along the face ( 200 ) from the first face point ( 300 ) to the face perimeter ( 210 ) is less than the Xcg distance.
18. A golf club head ( 100 ) of claim 17 , wherein the shortest distance along the face ( 200 ) from the first face point ( 300 ) to the face perimeter ( 210 ) is less than seventy-five percent of the Xcg distance.
19. A golf club head ( 100 ) of claim 17 , further including a second permanent indicia ( 410 ) located on a face heel portion ( 270 ) of the face ( 200 ) indicative of a second measured performance variable measured at a second face point ( 400 ) located on a face heel portion ( 270 ), wherein the face ( 200 ) has a second thickness ( 420 ) at the second face point ( 400 ), and the second permanent indicia ( 410 ) has a second indicia surface area ( 440 ).
20. A golf club head ( 100 ) of claim 19 , wherein the face ( 200 ) has a center face thickness ( 254 ) at the face center ( 250 ), and the second thickness ( 420 ) is different than the center face thickness ( 254 ).