Golf club heads having constant blade length

Abstract

To provide golf club heads having the same striking face length regardless of sole configuration.SOLUTION: A golf club head 100 utilizes the same leading edge blade length for same-lofted golf club heads to achieve consistent striking face length 150 for different bounce angles and / or grind types on soles.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention generally relates to golf club heads having the same loft and blade length dimensions regardless of sole configuration. More specifically, golf club heads of the same loft according to the present invention have the same striking face dimensions and visual appearance at address regardless of bounce angle and / or grind type. [Background technology]

[0002] Modern golf club design has evolved since the early days of golf. The good thing about every technological advancement in golf club technology is that it makes the game easier to play for golfers of all levels. However, these advancements come with great challenges for golf club engineers.

[0003] To improve shot confidence, it is important to provide a golfer with a consistent club head profile when standing at the address position. In the current design of iron-type golf club heads, the club is held at the designed loft and lie angles, the sole is brought into contact with the ground plane, a shaft axis intersection point where the shaft axis intersects with the ground plane is established, a vertical plane is established that is perpendicular to the ground plane and contacts the toe-most point of the golf club head, and the blade length is measured by measuring the distance from the shaft axis intersection point to the vertical plane. When the sole of a golf club head changes, problems arise when using the conventional design method. Even if the loft is the same, golf club heads with different sole heights due to differences in bounce angle and grind will have different intersection points of the shaft axis on the ground plane. To design golf club heads with the same blade length dimensions based on the conventional measurements, the position of the vertical plane must be adjusted, and the length of the striking face observed from the address position will change.

[0004] The present invention relates to golf club heads that have the same striking face length in a given loft with a consistent appearance at address regardless of sole configuration. The invention utilizes unique design aspects that ensure that the length of the striking face in the heel-toe direction is not affected by different bounce angles and / or grind types of the sole. Summary of the Invention

[0005] One aspect of the invention is a plurality of golf club heads, the plurality of golf club heads including: a first golf club head; and a second golf club head, the first golf club head having: a first striking face; a first back portion extending from a first topline behind the first striking face to a first sole; a first leading edge at a transition between the first striking face and the first sole; and a first hosel configured to receive a first shaft having a first shaft axis, the first hosel having a first heel portion. a first hosel disposed on a first face center of the first striking face, the first heel portion being disposed opposite the first toe portion; a first coordinate system centered on a first face center of the first striking face, the first coordinate system including a first y-axis extending perpendicular to a first ground plane when the first golf club head is in a first address position with a first prescribed loft angle and a first prescribed lie angle, a first x-axis extending toward a first heel portion of the first golf club head perpendicular to the first y-axis and parallel to the first striking face, and a first x-axis extending toward a first heel portion of the first golf club head perpendicular to the first y-axis and the first x-axis and passing through the first striking face; a first coordinate system having a first z-axis extending along a first axis of the first leading edge; a first leading edge plane parallel to the first ground plane and passing through a forward-most point of the first leading edge; a first shaft axis / leading edge plane intersection located where the first shaft axis intersects the first leading edge plane; a first vertical heel plane perpendicular to the first ground plane and passing through the first shaft axis / leading edge plane intersection; a first vertical toe plane perpendicular to the first ground plane and passing through a forward-most point on a toe side of the first golf club head; and a first leading edge blade length defined as the distance along the first x-axis between the first shaft axis / leading edge plane intersection; and a first striking face length defined as the distance along the first x-axis between the first vertical toe plane and the first vertical heel plane; the second golf club head having: a second striking face; a second back portion extending from a second topline behind the second striking face to a second sole; and a second leading edge at a transition between the second striking face and the second sole;a second hosel configured to receive a second shaft having a second shaft axis, the second hosel disposed on a second heel portion, the second heel portion disposed opposite a second toe portion; a second coordinate system centered on a second face center of the second striking face, the second coordinate system having a second y-axis extending perpendicular to a second ground plane when the second golf club head is in a second address position with a second prescribed loft angle and a second prescribed lie angle, a second x-axis perpendicular to the second y-axis and parallel to the second striking face extending toward the second heel portion of the second golf club head, and a second z-axis perpendicular to the second y-axis and the second x-axis extending through the second striking face; a second leading edge plane parallel to the second ground plane and passing through a forward-most point of the second leading edge; a second shaft axis / leading edge plane intersection point located where a second shaft axis intersects the second leading edge plane; a second vertical heel plane perpendicular to the second ground plane and passing through the second shaft axis / leading edge plane intersection point; a second vertical toe plane perpendicular to the second ground plane and passing through a forward-most point on a toe side of the second golf club head; a second leading edge blade length defined as the distance along the second x-axis between the second vertical toe plane and the second shaft axis / leading edge plane intersection point; and a second striking face length defined as the distance along the second x-axis between the second vertical toe plane and the second vertical heel plane; the first sole shape is different from the second sole shape, and the first leading edge blade length is equal to the second leading edge blade length;

[0006] Another aspect of the invention is a plurality of golf club heads, the plurality of golf club heads including: a first golf club head; and a second golf club head, the first golf club head having: a first striking face having a first plurality of scorelines with a heel side maximum extent and a toe side maximum extent; a first back portion extending from a first topline behind the first striking face to a first sole; a first leading edge at a transition between the first striking face and the first sole; and a first shaft receiving a first shaft axis. a first hosel configured to engage a first heel portion of the first golf club head, the first hosel being disposed on a first heel portion opposite a first toe portion; a first coordinate system centered on a first face center of the first striking face, the first coordinate system including a first y-axis extending perpendicular to a first ground plane when the first golf club head is in a first address position with a first prescribed loft angle and a first prescribed lie angle, a first x-axis perpendicular to the first y-axis and parallel to the first striking face, the first coordinate system extending toward the first heel portion of the first golf club head; a first coordinate system having a first y-axis and a first z-axis perpendicular to the first x-axis and extending through the first striking face; a first leading edge plane parallel to the first ground plane and passing through a forward-most point of the first leading edge; a first shaft axis / leading edge plane intersection point located where the first shaft axis intersects the first leading edge plane; a first vertical heel plane perpendicular to the first ground plane and passing through the first shaft axis / leading edge plane intersection point; and a first vertical heel plane perpendicular to the first ground plane and passing through a forward-most point of a toe side of the first golf club head. a first vertical toe plane passing through a center point; a first leading edge blade length defined as the distance along the first x-axis between the first vertical toe plane and the first shaft axis / leading edge plane intersection; a first striking face length defined as the distance along the first x-axis between the first vertical toe plane and the first vertical heel plane; and a first scoreline area defined as the area of ​​the first striking face between the heel maximum extent of the first plurality of scorelines and the toe maximum extent of the first plurality of scorelines;a first toe region defined as the area of ​​the first striking face between the toe maximum extent of the first plurality of scorelines and the first vertical toe plane; and a first heel region defined as the area of ​​the first striking face between the heel maximum extent of the first plurality of scorelines and the first vertical heel plane; the second golf club head having: a second striking face having a second plurality of scorelines with a heel maximum extent and a toe maximum extent; and a second topline behind the second striking face from a second sole to a second sole. a second back portion extending from the second striking face; a second leading edge of a transition between the second striking face and the second sole; a second hosel configured to receive a second shaft having a second shaft axis, the second hosel being disposed on a second heel portion, the second heel portion being disposed opposite a second toe portion; a second coordinate system centered on a second face center of the second striking face, the second coordinate system defining a second coordinate system when the second golf club head is in a second address position at a second prescribed loft angle and a second prescribed lie angle. a second coordinate system having a second y-axis extending perpendicular to the ground plane, a second x-axis perpendicular to the second y-axis extending toward a second heel portion of the second golf club head and parallel to the second striking face, and a second z-axis perpendicular to the second y-axis and the second x-axis extending through the second striking face; a second leading edge plane parallel to the second ground plane and passing through a forward-most point of the second leading edge; and a second shaft axis / leading edge plane intersection point located where the second shaft axis intersects the second leading edge plane. a second vertical heel plane perpendicular to the second ground plane and passing through the second shaft axis / leading edge plane intersection; a second vertical toe plane perpendicular to the second ground plane and passing through a forward-most point on a toe side of the second golf club head; a second leading edge blade length defined as the distance along the second x-axis between the second vertical toe plane and the second shaft axis / leading edge plane intersection; and a second striking face length defined as the distance along the second x-axis between the second vertical toe plane and the second vertical heel plane;a second scoreline area defined as the area of ​​the second striking face between the heel maximum extent of the second plurality of scorelines and the toe maximum extent of the second plurality of scorelines; a second toe area defined as the area of ​​the second striking face between the toe maximum extent of the second plurality of scorelines and the second vertical toe plane; a second heel area defined as the area of ​​the second striking face between the heel maximum extent of the second plurality of scorelines and the second vertical heel plane; a maximum height of the first sole along the first Y-axis is different from a maximum height of the second sole along the second Y-axis; and a length of the first scoreline area along the first X-axis is equal to a length of the second scoreline area along the second X-axis.

[0007] Another aspect of the invention is a plurality of golf club heads, the plurality of golf club heads including: a first golf club head; and a second golf club head, the first golf club head having: a first striking face having a first plurality of scorelines with a heel side maximum extent and a toe side maximum extent; a first back portion extending from a first topline behind the first striking face to a first sole; a first leading edge at a transition between the first striking face and the first sole; and a second golf club head having a first shaft axis. a first hosel configured to receive a first shaft, the first hosel being disposed on a first heel portion, the first heel portion being disposed opposite a first toe portion; a first coordinate system centered on a first face center of the first striking face, the first coordinate system including a first y-axis extending perpendicular to a first ground plane when the first golf club head is in a first address position with a first prescribed loft angle and a first prescribed lie angle, and a first y-axis extending perpendicular to the first y-axis extending toward the first heel portion of the first golf club head and a first y-axis extending perpendicular to the first y-axis. the first coordinate system having a first x-axis parallel to the first striking face and a first z-axis perpendicular to the first y-axis and the first x-axis and extending through the first striking face; a first leading edge plane parallel to the first ground plane and passing through a forward-most point of the first leading edge; a first shaft axis / leading edge plane intersection located where the first shaft axis intersects with the first leading edge plane; a first shaft axis / ground plane intersection located where the first shaft axis intersects with the first ground plane; a first vertical heel plane perpendicular to the ground plane and passing through the first shaft axis / leading edge plane intersection; a first vertical toe plane perpendicular to the first ground plane and passing through a forward-most point on a toe side of the first golf club head; a first leading edge blade length defined as the distance along the first x-axis between the first vertical toe plane and the first shaft axis / leading edge plane intersection; and a first striking face length defined as the distance along the first x-axis between the first vertical toe plane and the first vertical heel plane;a first scoreline area defined as the area of ​​the first striking face between the heel side maximum extent of the first plurality of scorelines and the toe side maximum extent of the first plurality of scorelines; a first toe area defined as the area of ​​the first striking face between the toe side maximum extent of the first plurality of scorelines and the first vertical toe plane; and a first heel area defined as the area of ​​the first striking face between the heel side maximum extent of the first plurality of scorelines and the first vertical heel plane; The club head includes: a second striking face having a second plurality of scorelines having a heel maximum extent and a toe maximum extent; a second back portion extending from a second topline behind the second striking face to a second sole; a second leading edge at a transition between the second striking face and the second sole; and a second hosel configured to receive a second shaft having a second shaft axis, the second hosel being disposed on a second heel portion, the second heel portion being disposed opposite a second toe portion. a hosel; a second coordinate system centered on a second face center of the second striking face, the second coordinate system having a second y-axis extending perpendicular to a second ground plane when the second golf club head is in a second address position with a second prescribed loft angle and a second prescribed lie angle, a second x-axis perpendicular to the second y-axis and parallel to the second striking face extending toward a second heel portion of the second golf club head, and a second z-axis perpendicular to the second y-axis and the second x-axis extending through the second striking face; a second leading edge plane passing through the forward-most point of the second leading edge; a second shaft axis / leading edge plane intersection point located where the second shaft axis intersects with the second leading edge plane; a second shaft axis / ground plane intersection point located where the second shaft axis intersects with the second ground plane; a second vertical heel plane perpendicular to the second ground plane and passing through the second shaft axis / leading edge plane intersection point; a second vertical toe plane perpendicular to the second ground plane and passing through the forward-most point on the toe side of the second golf club head;a second leading edge blade length defined as the distance along the second x-axis between the second vertical toe plane and the second shaft axis / leading edge plane intersection; a second striking face length defined as the distance along the second x-axis between the second vertical toe plane and the second vertical heel plane; a second scoreline area defined as the area of ​​the second striking face between the heel side maximum extent of the second plurality of scorelines and the toe side maximum extent of the second plurality of scorelines; a second toe region defined as the area of ​​the second striking face between a maximum extent and the second vertical toe plane; a second heel region defined as the area of ​​the second striking face between the heel maximum extent of the second plurality of scorelines and the second vertical heel plane; the first prescribed loft angle is equal to the second prescribed loft angle; the shape of the first sole is different from the shape of the second sole; and a distance between the first shaft axis / ground plane intersection and the first vertical toe plane is different from a distance between the second shaft axis / ground plane intersection and the second vertical toe plane;

[0008] These and other features, aspects, and advantages of the present invention will become better understood with reference to the following drawings, description, and claims. [Brief description of the drawings]

[0009] The above and other features and advantages of the present invention will become apparent from the following description of the invention as illustrated in the accompanying drawings, which are incorporated herein and form a part of the specification, and further serve to explain the principles of the invention and to enable one skilled in the art to make or use the invention.

[0010] [Figure 1] FIG. 1 of the accompanying drawings shows a side view of a golf club head in accordance with an embodiment of the present invention. [Diagram 2] FIG. 2 of the accompanying drawings shows a side view of a golf club head in accordance with an embodiment of the present invention. [Diagram 3]FIG. 3 of the accompanying drawings shows a front view of the golf club head of FIG. [Figure 4] FIG. 4 of the accompanying drawings shows a front view of the golf club head of FIG. [Diagram 5] FIG. 5 of the accompanying drawings shows a front view of the golf club head of FIG. [Figure 6] FIG. 6 of the accompanying drawings shows a front view of the golf club head of FIG. Detailed Description of the Invention

[0011] The following detailed description sets forth the best mode presently contemplated for carrying out the invention. This description is not to be taken in a limiting sense, but is made merely for the purpose of illustrating the general principles of the invention, the scope of which is best defined by the appended claims.

[0012] Various inventive features are described below, each of which can be used independently of one another or in combination with the other features.

[0013] 1-6 of the accompanying drawings illustrate golf club heads 100 and 200 for a better understanding of the present invention. The golf club head 100 includes a striking face 110, a back portion 122, a topline 112, a toe portion 114, a sole 116, a heel portion 118, and a hosel 120 configured to receive a shaft (not shown) having a shaft axis SA. The striking face 110 includes a plurality of scorelines 124 extending in a heel-to-toe direction and a face center located midway between a heel-side maximum limit of the plurality of scorelines 124 and a toe-side maximum limit of the plurality of scorelines 124. The golf club head 100 further includes a leading edge 130 at the transition from the striking face 110 to the sole 116.

[0014] The golf club head 200 includes a striking face 210, a back portion 222, a topline 212, a toe portion 214, a sole 216, a heel portion 218, and a hosel 220 configured to receive a shaft (not shown) having a shaft axis SA. The striking face 210 includes a plurality of scorelines 224 extending in a heel-to-toe direction and a face center located midway between a heel-side maximum extent of the plurality of scorelines 224 and a toe-side maximum extent of the plurality of scorelines 224. The golf club head 200 further includes a leading edge 230 at the transition from the striking face 210 to the sole 216.

[0015] The golf club head 100 includes a coordinate system centered on the face center of the striking face 110. The coordinate system includes a y-axis that extends perpendicular to the ground plane GP when the golf club head 100 is in an address position at a given loft angle and a given lie angle. The coordinate system includes an x-axis that is perpendicular to the y-axis, parallel to the striking face 110 and the ground plane GP, and extends toward the heel portion 118 of the golf club head 100. The coordinate system includes a z-axis that is perpendicular to the y-axis and parallel to the striking face 110 and the ground plane GP, and extends through the striking face 110. The golf club head 100 further defines a leading edge plane LEP that is parallel to the ground plane GP and passes through the forward-most point of the leading edge 130. The striking face 110 includes a striking face length 150 that is defined as the distance along the x-axis between the vertical toe plane VTP and the vertical heel plane VHP when the golf club head 100 is in an address position at a given loft angle and a given lie angle. Here, the vertical toe plane VTP is a plane perpendicular to the ground plane GP that includes the forward-most point of the golf club head 100, and the vertical heel plane VHP is a plane perpendicular to the ground plane GP that includes the shaft axis / leading edge plane intersection 160, which is the point where the shaft axis SA intersects the leading edge plane LEP. The hitting face 110 includes a scoreline region 151, a toe region 153, and a heel region 155. The scoreline region 151 is defined as the area of ​​the hitting face 110 between the heel side maximum limit of the plurality of scorelines 124 and the toe side maximum limit of the plurality of scorelines 124. The toe region 153 is defined as the area of ​​the hitting face 110 between the toe side maximum limit of the plurality of scorelines 124 and the vertical toe plane VTP. The heel region 155 is defined as the area of ​​the hitting face 110 between the heel side maximum limit of the plurality of scorelines 124 and the vertical heel plane VHP.

[0016] The golf club head 200 includes a coordinate system centered on the face center of the striking face 210. The coordinate system includes a y-axis that extends perpendicular to the ground plane GP when the golf club head 200 is in an address position at a given loft angle and a given lie angle. The coordinate system includes an x-axis that is perpendicular to the y-axis, parallel to the striking face 210 and the ground plane GP, and extends toward the heel portion 218 of the golf club head 200. The coordinate system includes a z-axis that is perpendicular to the y-axis and parallel to the striking face 210 and the ground plane GP and extends through the striking face 210. The golf club head 200 further defines a leading edge plane LEP that is parallel to the ground plane GP and passes through the forward-most point of the leading edge 230. The striking face 210 includes a striking face length 250 that is defined as the distance along the x-axis between the vertical toe plane VTP and the vertical heel plane VHP when the golf club head 200 is in an address position at a given loft angle and a given lie angle. Here, the vertical toe plane VTP is a plane perpendicular to the ground plane GP that includes the forward-most point of the golf club head 200, and the vertical heel plane VHP is a plane perpendicular to the ground plane GP that includes the shaft axis / leading edge plane intersection 260, which is the point where the shaft axis SA intersects the leading edge plane LEP. The striking face 210 includes a scoreline region 251, a toe region 253, and a heel region 255. The scoreline region 251 is defined as the area of ​​the striking face 210 between the maximum limit of the heel side of the plurality of scorelines 224 and the maximum limit of the toe side of the plurality of scorelines 224. The toe region 253 is defined as the area of ​​the striking face 210 between the maximum limit of the toe side of the plurality of scorelines 224 and the vertical toe plane VTP. The heel region 255 is defined as the area of ​​the striking face 210 between the maximum limit of the heel side of the plurality of scorelines 224 and the vertical heel plane VHP.

[0017] Although golf club head 100 and golf club head 200 have the same specified loft angle and specified lie angle, sole 116 of golf club head 100 has a different shape than sole 216 of golf club head 200. In the embodiment shown in Figures 1-6, the maximum height of sole 116 along the Y axis is lower than the maximum height of sole 216 along the Y axis. The reason why sole 116 has a lower maximum height along the Y axis is because the bounce angle of golf club head 100 is smaller than the bounce angle of golf club head 200.

[0018] 3 and 4 show a conventional method of measuring the blade length of an iron-type golf club head, referred to in this application as the ground plane blade length GPBL. As shown in FIG 3, the ground plane blade length GPBL is the distance along the x-axis between the vertical toe plane VTP and the shaft axis / ground plane intersection 140, which is the point where the shaft axis SA intersects the ground plane GP when the golf club head 100 is in an address position at a specified loft angle and a specified lie angle.

[0019] Similar to FIG. 3, FIG. 4 shows that the ground plane blade length GPBL is the distance along the x-axis between the vertical toe plane VTP and the shaft axis / ground plane intersection 240, which is the point where the shaft axis SA intersects the ground plane GP when the golf club head 200 is in the address position at a specified loft angle and a specified lie angle.

[0020] Conventional golf club head designs keep the ground plane blade length GPBL constant for clubs with the same loft, regardless of sole configuration, but this creates the problem of different heel-to-toe striking face lengths for golf club heads with the same loft. As the sole dimension along the y-axis changes due to different bounce angles and / or grind types, the location along the shaft axis SA where the shaft axis SA intersects with the ground plane GP also changes. Because the shaft axis SA has an x-axis component, moving the intersection of the shaft axis SA and the ground plane GP downward along the shaft axis SA moves the vertical toe plane VTP away from the heel portion, increasing the striking face length. Conversely, moving the intersection of the shaft axis SA and the ground plane GP upward along the shaft axis SA moves the vertical toe plane VTP toward the heel portion, decreasing the striking face length. Thus, designing golf club heads of the same loft with a fixed ground plane blade length GPBL means changing the length of one or more of the scoreline region, toe region, or heel region of the striking face for different sole geometries. As a result, a golfer will see inconsistent golf club head sizes at address position for golf club heads of the same loft.

[0021] The present invention addresses the above problems in conventional golf club head designs. Figures 5 and 6 show an exemplary embodiment of the present invention. As shown in Figure 5, the present invention utilizes a leading edge blade length LEBL defined as the distance along the x-axis between the vertical toe plane VTP and the shaft axis / leading edge plane intersection point 160 when the golf club head 100 is in an address position with a given loft angle and a given lie angle. Similar to Figure 5, Figure 6 shows the leading edge blade length LEBL defined as the distance along the x-axis between the vertical toe plane VTP and the shaft axis / leading edge plane intersection point 260 when the golf club head 200 is in an address position with a given loft angle and a given lie angle.

[0022] The present invention uses a constant leading edge blade length LEBL, rather than a constant ground plane blade length GPBL, to create golf club heads of the same loft. The leading edge blade length LEBL is the same for both golf club head 100 and golf club head 200 with the same loft, so that the striking face length 150 of golf club head 100 is the same as the striking face length 250 of golf club head 200, even though the maximum height along the y-axis of sole 116 of golf club head 100 is smaller than sole 216 of golf club head 200. Because the striking face length 150 of golf club head 100 is equal to the striking face length 250 of golf club head 200, individual regions of striking face 110 can have the same length as individual regions of striking face 210, improving uniformity. In other words, the length along the x-axis of the scoreline region 151 may be equal to the length along the x-axis of the scoreline region 251, the length along the x-axis of the toe region 153 may be equal to the length along the x-axis of the toe region 253, and the length along the x-axis of the heel region 155 may be equal to the length along the x-axis of the heel region 255.

[0023] Designing golf club heads of the same loft with a constant leading edge blade length, LEBL, results in golf club heads with the same striking face length and the same appearance at address regardless of sole configuration. A consistent striking area and appearance of the golf club head at address is important to achieve consistent performance across the striking face and provide a confidence-inspiring visual. This is an advantage over traditional designs that use a constant ground plane blade length, GPBL, for golf club heads of the same loft, where a change in sole configuration results in a different striking face length and a different appearance at address.

[0024] Although specific embodiments and aspects have been described herein and specific examples have been given, the scope of the invention is not limited to these specific embodiments and examples. Those skilled in the art will recognize other embodiments or modifications that are within the scope and spirit of the invention. Thus, the specific structures, acts, or media are disclosed as exemplary embodiments only. The scope of the invention is defined by the following claims and their equivalents.

Claims

1. In a plurality of golf club heads, A first golf club head; a second golf club head; The first golf club head comprises: A first striking face; a first back portion extending from a first topline behind the first striking face to a first sole; a first leading edge of a transition between the first striking face and the first sole; a first hosel configured to receive a first shaft having a first shaft axis, the first hosel being disposed over a first heel portion, the first heel portion being disposed opposite a first toe portion; a first coordinate system centered on a first face center of the first striking face, the first coordinate system having a first y-axis extending perpendicular to a first ground plane when the first golf club head is in a first address position with a first prescribed loft angle and a first prescribed lie angle, a first x-axis extending toward a first heel portion of the first golf club head perpendicular to the first y-axis and parallel to the first striking face, and a first z-axis perpendicular to the first y-axis and the first x-axis extending through the first striking face; a first leading edge plane parallel to the first ground plane and passing through a forward-most point of the first leading edge; a first shaft axis / leading edge plane intersection point located where the first shaft axis intersects the first leading edge plane; a first vertical heel plane perpendicular to the first ground plane and passing through the first shaft axis / leading edge plane intersection; a first vertical toe plane perpendicular to the first ground plane and passing through a forward-most point on a toe side of the first golf club head; a first leading edge blade length defined as the distance along the x-axis between the first vertical toe plane and the first shaft axis / leading edge plane intersection; a first striking face length defined as a distance along the first x-axis between the first vertical toe plane and the first vertical heel plane; The second golf club head includes: A second striking face; and a second back portion extending from a second topline behind the second striking face to a second sole; a second leading edge of a transition between the second striking face and the second sole; a second hosel configured to receive a second shaft having a second shaft axis, the second hosel being disposed on a second heel portion, the second heel portion being disposed opposite the second toe portion; a second coordinate system centered on a second face center of the second striking face, the second coordinate system having a second y-axis extending perpendicular to a second ground plane when the second golf club head is in a second address position with a second prescribed loft angle and a second prescribed lie angle, a second x-axis extending toward a second heel portion of the second golf club head perpendicular to the second y-axis and parallel to the second striking face, and a second z-axis extending through the second striking face perpendicular to the second y-axis and the second x-axis; a second leading edge plane parallel to the second ground plane and passing through a forward-most point of the second leading edge; a second shaft axis / leading edge plane intersection point located where the second shaft axis intersects the second leading edge plane; and a second vertical heel plane perpendicular to the second ground plane and passing through the second shaft axis / leading edge plane intersection; a second vertical toe plane perpendicular to the second ground plane and passing through a forward-most point on a toe side of the second golf club head; a second leading edge blade length defined as the distance along the x-axis between the second vertical toe plane and the second shaft axis / leading edge plane intersection; a second striking face length defined as the distance along the second x-axis between the second vertical toe plane and the second vertical heel plane; A plurality of golf club heads, wherein the first sole shape is different from the second sole shape, and the first leading edge blade length is equal to the second leading edge blade length.

2. 2. The plurality of golf club heads of claim 1, wherein said first prescribed loft angle is equal to said second prescribed loft angle.

3. 3. The plurality of golf club heads of claim 2, wherein said first prescribed lie angle is equal to said second prescribed lie angle.

4. The plurality of golf club heads of claim 2 , wherein a maximum height of the first sole along the first Y-axis is different from a maximum height of the second sole along the second Y-axis.

5. 3. The plurality of golf club heads of claim 2, wherein the bounce angle of the first sole is different from the bounce angle of the second sole.

6. In a plurality of golf club heads, A first golf club head; a second golf club head; The first golf club head comprises: a first striking face having a first plurality of scorelines having a heel side maximum extent and a toe side maximum extent; a first back portion extending from a first topline behind the first striking face to a first sole; a first leading edge of a transition between the first striking face and the first sole; a first hosel configured to receive a first shaft having a first shaft axis, the first hosel being disposed on a first heel portion, the first heel portion being disposed opposite a first toe portion; a first coordinate system centered on a first face center of the first striking face, the first coordinate system having a first y-axis extending perpendicular to a first ground plane when the first golf club head is in a first address position with a first prescribed loft angle and a first prescribed lie angle, a first x-axis extending toward a first heel portion of the first golf club head, perpendicular to the first y-axis and parallel to the first striking face, and a first z-axis extending through the first striking face and perpendicular to the first y-axis and the first x-axis; a first leading edge plane parallel to the first ground plane and passing through a forward-most point of the first leading edge; a first shaft axis / leading edge plane intersection point located where the first shaft axis intersects the first leading edge plane; a first vertical heel plane perpendicular to the first ground plane and passing through the first shaft axis / leading edge plane intersection; a first vertical toe plane perpendicular to the first ground plane and passing through a forward-most point on a toe side of the first golf club head; a first leading edge blade length defined as the distance along the x-axis between the first vertical toe plane and the first shaft axis / leading edge plane intersection; a first striking face length defined as the distance along the first x-axis between the first vertical toe plane and the first vertical heel plane; a first scoreline area defined as an area of ​​the first striking face between the heel side maximum extent of the first plurality of scorelines and the toe side maximum extent of the first plurality of scorelines; a first toe region defined as an area of ​​the first striking face between the toe maximum extent of the first plurality of scorelines and the first vertical toe plane; a first heel area defined as an area of ​​the first striking face between the heel side maximum extent of the first plurality of scorelines and the first vertical heel plane; The second golf club head includes: a second striking face having a second plurality of scorelines having a heel side maximum extent and a toe side maximum extent; a second back portion extending from a second topline behind the second striking face to a second sole; a second leading edge of a transition between the second striking face and the second sole; a second hosel configured to receive a second shaft having a second shaft axis, the second hosel being disposed on a second heel portion, the second heel portion being disposed opposite the second toe portion; a second coordinate system centered on a second face center of the second striking face, the second coordinate system having a second y-axis extending perpendicular to a second ground plane when the second golf club head is in a second address position with a second prescribed loft angle and a second prescribed lie angle, a second x-axis extending toward a second heel portion of the second golf club head perpendicular to the second y-axis and parallel to the second striking face, and a second z-axis extending through the second striking face perpendicular to the second y-axis and the second x-axis; a second leading edge plane parallel to the second ground plane and passing through a forward-most point of the second leading edge; a second shaft axis / leading edge plane intersection point located where the second shaft axis intersects the second leading edge plane; and a second vertical heel plane perpendicular to the second ground plane and passing through the second shaft axis / leading edge plane intersection; a second vertical toe plane perpendicular to the second ground plane and passing through a forward-most point on a toe side of the second golf club head; a second leading edge blade length defined as the distance along the x-axis between the second vertical toe plane and the second shaft axis / leading edge plane intersection; a second striking face length defined as the distance along the second x-axis between the second vertical toe plane and the second vertical heel plane; a second scoreline area defined as an area of ​​the second striking face between the heel side maximum extent of the second plurality of scorelines and the toe side maximum extent of the second plurality of scorelines; a second toe region defined as an area of ​​the second striking face between the toe maximum extent of the second plurality of scorelines and the second vertical toe plane; a second heel area defined as an area of ​​the second striking face between the heel side maximum extent of the second plurality of scorelines and the second vertical heel plane; a maximum height of the first sole along the first Y-axis is different from a maximum height of the second sole along the second Y-axis; A plurality of golf club heads, wherein a length of the first scoreline area along the first X-axis is equal to a length of the second scoreline area along the second X-axis.

7. In a plurality of golf club heads, A first golf club head; a second golf club head; The first golf club head comprises: a first striking face having a first plurality of scorelines having a heel side maximum extent and a toe side maximum extent; a first back portion extending from a first topline behind the first striking face to a first sole; a first leading edge of a transition between the first striking face and the first sole; a first hosel configured to receive a first shaft having a first shaft axis, the first hosel being disposed on a first heel portion, the first heel portion being disposed opposite a first toe portion; a first coordinate system centered on a first face center of the first striking face, the first coordinate system having a first y-axis extending perpendicular to a first ground plane when the first golf club head is in a first address position with a first prescribed loft angle and a first prescribed lie angle, a first x-axis extending toward a first heel portion of the first golf club head perpendicular to the first y-axis and parallel to the first striking face, and a first z-axis perpendicular to the first y-axis and the first x-axis extending through the first striking face; a first leading edge plane parallel to the first ground plane and passing through a forward-most point of the first leading edge; a first shaft axis / leading edge plane intersection point located where the first shaft axis intersects the first leading edge plane; a first shaft axis / ground plane intersection point located where the first shaft axis intersects the first ground plane; a first vertical heel plane perpendicular to the first ground plane and passing through the first shaft axis / leading edge plane intersection; a first vertical toe plane perpendicular to the first ground plane and passing through a forward-most point on a toe side of the first golf club head; a first leading edge blade length defined as the distance along the x-axis between the first vertical toe plane and the first shaft axis / leading edge plane intersection; a first striking face length defined as the distance along the first x-axis between the first vertical toe plane and the first vertical heel plane; a first scoreline area defined as an area of ​​the first striking face between the heel side maximum extent of the first plurality of scorelines and the toe side maximum extent of the first plurality of scorelines; a first toe region defined as an area of ​​the first striking face between the toe maximum extent of the first plurality of scorelines and the first vertical toe plane; a first heel area defined as an area of ​​the first striking face between the heel side maximum extent of the first plurality of scorelines and the first vertical heel plane; The second golf club head includes: a second striking face having a second plurality of scorelines having a heel side maximum extent and a toe side maximum extent; a second back portion extending from a second topline behind the second striking face to a second sole; a second leading edge of a transition between the second striking face and the second sole; a second hosel configured to receive a second shaft having a second shaft axis, the second hosel being disposed on a second heel portion, the second heel portion being disposed opposite the second toe portion; a second coordinate system centered on a second face center of the second striking face, the second coordinate system having a second y-axis extending perpendicular to a second ground plane when the second golf club head is in a second address position with a second prescribed loft angle and a second prescribed lie angle, a second x-axis extending toward a second heel portion of the second golf club head perpendicular to the second y-axis and parallel to the second striking face, and a second z-axis extending through the second striking face perpendicular to the second y-axis and the second x-axis; a second leading edge plane parallel to the second ground plane and passing through a forward-most point of the second leading edge; a second shaft axis / leading edge plane intersection point located where the second shaft axis intersects the second leading edge plane; and a second shaft axis / ground plane intersection point located where the second shaft axis intersects the second ground plane; a second vertical heel plane perpendicular to the second ground plane and passing through the second shaft axis / leading edge plane intersection; a second vertical toe plane perpendicular to the second ground plane and passing through a forward-most point on a toe side of the second golf club head; a second leading edge blade length defined as the distance along the second x-axis between the second vertical toe plane and the second shaft axis / leading edge plane intersection; a second striking face length defined as the distance along the second x-axis between the second vertical toe plane and the second vertical heel plane; a second scoreline area defined as an area of ​​the second striking face between the heel side maximum extent of the second plurality of scorelines and the toe side maximum extent of the second plurality of scorelines; a second toe region defined as an area of ​​the second striking face between the toe maximum extent of the second plurality of scorelines and the second vertical toe plane; a second heel area defined as an area of ​​the second striking face between the heel side maximum extent of the second plurality of scorelines and the second vertical heel plane; The first prescribed loft angle is equal to the second prescribed loft angle, The shape of the first sole is different from the shape of the second sole, a distance between the first shaft axis / ground plane intersection and the first vertical toe plane that is different from a distance between the second shaft axis / ground plane intersection and the second vertical toe plane.

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