Golf club head

Abstract

To improve spin performance of a face part.SOLUTION: A golf club head comprises: a face part; a plurality of score lines formed in the face part and extending in a toe-heel direction; and a plurality of protrusions formed in the face part, protruding from a reference surface including each edge end of the plurality of score lines, and extending in the toe-heel direction. The plurality of protrusions include a first protrusion and a second protrusion formed between the adjacent score lines. At least one of a projection height and a width in an orthogonal direction to the toe-heel direction of the first protrusion is larger than that of the second protrusion.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a golf club head. [Background technology]

[0002] There are known techniques for improving the spin performance of a hit ball by using score lines on the face portion or grooves that are finer than score lines (for example, Patent Documents 1 and 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-217196 [Patent Document 2] Japanese Patent Application Publication No. 2019-217195 [Patent Document 3] Japanese Patent Application Laid-Open No. 2014-030566 [Patent Document 4] Japanese Patent Application Publication No. 2017-077274 [Patent Document 5] Japanese Patent Publication No. 2020-120712 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the conventional technology leaves room for improvement in terms of the spin performance of the face portion.

[0005] An object of the present invention is to improve the spin performance of the face portion. [Means for solving the problem]

[0006] According to the present invention, A face portion; a plurality of score lines formed on the face portion and extending in a toe-heel direction; a plurality of protrusions formed on the face portion, protruding from a reference plane including each edge of the plurality of scorelines and extending in the toe-heel direction; the plurality of convex portions include a first convex portion and a second convex portion formed between adjacent score lines, The first convex portion is larger than the second convex portion, Projection height and Width in the direction perpendicular to the toe-heel direction Both is large Ku , The plurality of protrusions are formed with a plurality of recesses recessed toward the reference surface in a protrusion height direction of the protrusions, The plurality of recesses include a recess having a bottom surface positioned higher than the reference surface. A golf club head is provided. [Effects of the Invention]

[0007] According to the present invention, the spin performance of the face portion can be improved. [Brief explanation of the drawings]

[0008] [Figure 1] 1A and 1B are an external view and a partially enlarged view of a golf club head according to an embodiment of the present invention; [Figure 2] 2 is a cross-sectional view of the golf club head taken along line AA in FIG. 1. [Figure 3] 10A and 10B are cross-sectional views showing other configuration examples of the protrusions. [Figure 4] 10A and 10B are an external view and a partially enlarged view of a golf club head according to another embodiment. [Figure 5] (A) is a cross-sectional view taken along line BB in Figure 4, and (B) is a cross-sectional view taken along line CC in Figure 4. [Figure 6] 10A is a diagram showing a basic pattern of a plurality of recesses, and FIG. 10B is a cross-sectional view showing another example of the depth of the recesses. [Figure 7] 10A and 10B are external views of golf club heads having different basic patterns of recesses. [Figure 8] 10A and 10B are external views of golf club heads having different basic patterns of recesses. [Figure 9] 9(A) is a diagram showing the basic pattern of the example of FIG. 7, (B) is a diagram showing the basic pattern of the example of FIG. 8, and (C) is a diagram showing an example of the broken lines that make up the basic pattern of FIG. 9(B). [Figure 10] 10A and 10B are explanatory diagrams for quantifying the relationship between the number of convex portions and the number of concave portions to serve as an index. [Figure 11] 4A to 4C are diagrams showing an example of a manufacturing method for a golf club head. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, the embodiments will be described in detail with reference to the accompanying drawings. Note that the following embodiments do not limit the scope of the invention as claimed, and not all combinations of features described in the embodiments are necessarily essential to the invention. Two or more of the features described in the embodiments may be arbitrarily combined. Furthermore, the same reference numerals are used for the same or similar components, and redundant explanations will be omitted.

[0010] First Embodiment FIG. 1 shows an external view and a partially enlarged view of a golf club head 1 according to one embodiment of the present invention. The example in the figure shows an example in which the present invention is applied to an iron-type golf club head. The present invention is suitable for iron-type golf club heads, particularly middle irons, short irons, and wedge-type golf club heads. Specifically, the present invention is suitable for manufacturing golf club heads with a loft angle of 30 degrees or more and 70 degrees or less and a head weight of 240 g or more and 320 g or less. However, the present invention can also be applied to wood-type and utility-type (hybrid-type) golf club heads.

[0011] The golf club head 1 comprises a face portion 2 and a hosel portion 5. The face portion 2 forms a striking surface for striking a golf ball. A shaft (not shown) is attached to the hosel portion 5. In FIG. 1, an arrow D1 indicates the toe-heel direction, with T indicating the toe side and H indicating the heel side. An arrow D2 indicates a direction perpendicular to the D1 direction, and is a vertical direction along the face portion 2 (a direction from the top line 4 to the leading edge 3). )of U is the upper side (top line 4 side) when the sole part of the head 1 is in contact with the ground, and L is the lower side (leading edge 3 side) when the sole part of the head 1 is in contact with the ground. side ) is shown.

[0012] A plurality of scorelines 6 and a plurality of protrusions 7 are formed on the face portion 2. The scorelines 6 and the protrusions 7 will be described with reference to Fig. 2 in addition to Fig. 1. Fig. 2 is a cross-sectional view taken along line AA in Fig. 1, showing two adjacent scorelines 6 and the structure between these scorelines 6, of the golf club head 1.

[0013] Each scoreline 6 is a linear groove extending in the D1 direction. The scorelines 6 are arranged parallel to one another in the D2 direction. In this embodiment, the scorelines 6 are arranged at equal intervals (equal pitch), but the intervals may be different. In this embodiment, the cross-sectional shape of the scorelines 6 is the same except for both ends in the longitudinal direction (toe-side end and heel-side end). In addition, the cross-sectional shape of each scoreline 6 is the same.

[0014] The scoreline 6 has a pair of side walls (side portions) 61 and a bottom wall (bottom portion) 62, and its cross-sectional shape is formed into a trapezoidal shape symmetrical with respect to the center line in the D2 direction. The cross-sectional shape of the scoreline 6 is not limited to a trapezoidal shape, and may be other shapes such as a V-shape. The edge portions 63 of the scoreline 6 are rounded. The radius of the roundness is, for example, 0.05 mm or more and 0.3 mm or less. The face portion 2 has a reference surface 10. The reference surface 10 is a flat surface that includes the edge ends of each edge portion 63 of the scoreline 6. In other words, the reference surface 10 is an imaginary surface that includes the edge ends of each edge portion 63.

[0015] The depth H1 of the scoreline 6 (the distance between the bottom wall 62 and the reference plane 10) is preferably 0.3 mm or more. When the golf club head 1 is used for competition, the depth H1 must be 0.5 mm or less to comply with the rules. The width W1 of the scoreline 6 (width measured by the 30-degree measurement method) is preferably 0.6 mm or more. When the golf club head 1 is used for competition, the width W1 must be 0.9 mm or less to comply with the rules.

[0016] The multiple protrusions 7 are formed across the entire face portion 2, and each protrusion protrudes above the reference surface 10 and extends linearly in the direction D1 parallel to the scoreline 6. In this embodiment, each protrusion protrudes from the reference surface 10 in the direction normal to the reference surface 10. The multiple protrusions 7 are arranged parallel to one another in the direction D2. This makes it easier for the surface of the golf ball to bite into the spaces between adjacent protrusions when hit, improving the spin performance of the golf ball.

[0017] In this embodiment, the plurality of convex portions 7 includes two types of convex portions 8 and convex portions 9 having different specifications. In other words, convex portions 7 is a general term for convex portions 8 and convex portions 9. In this embodiment, the plurality of convex portions 7 includes only these two types of convex portions, but may include three or more types of convex portions. Four rows of convex portions 8 and three rows of convex portions 9 are formed between two score lines 6 adjacent in the D2 direction. In other words, a total of seven convex portions 7 are formed between two score lines 6 adjacent in the D2 direction. The number of convex portions 7 formed between two score lines 6 adjacent in the D2 direction is five to nine, and preferably seven to nine.

[0018] In this embodiment, four rows of convex portions 8 and three rows of convex portions 9 are formed with the same arrangement structure between any two adjacent scorelines 6 in the D2 direction. This makes it possible to prevent spin performance from being biased depending on the impact position within the face portion 2.

[0019] As shown in FIG. 2, the cross-sectional shape of the protrusions 8 and 9 taken along the cutting line in the D2 direction is a trapezoid. However, the cross-sectional shape of the protrusions 8 and 9 may be other shapes such as a triangle, a rectangle, or an arc. The width W2 of the protrusion 8 in the D2 direction and the width W3 of the protrusion 9 in the D2 direction are in the relationship W2>W3. Furthermore, the protrusion height H2 of the protrusion 8 from the reference plane 10 to its top and the width W3 of the protrusion 8 are in the relationship W2>W3. 9 The protrusion height H3 from the reference plane 10 to the top of the protrusion 8 satisfies the relationship H2 > H3. Thus, the protrusion height and width in the D2 direction of the protrusion 8 are greater than those of the protrusion 9. By forming the protrusions 8 and 9 with different protrusion heights and widths, it is possible to improve drainage and prevent clogging by turf and the like, thereby further improving spin performance.

[0020] The widths W2 and W3 are, for example, 30 μm to 150 μm, and the ratio between them is, for example, 1.2≦W2 / W3≦2.5. The protrusion heights H2 and H3 are, for example, 10 μm to 25 μm, and the ratio between them is, for example, 1.1≦H2 / H3≦1.5.

[0021] In this embodiment, the arrangement pitch P2 of the protrusions 8 is a uniform pitch, for example, 500 μm≦P2≦1500 μm. In this embodiment, the arrangement pitch P3 of the protrusions 9 is a uniform pitch, for example, 500 μm≦P3≦1500 μm. The intervals between adjacent protrusions 8 and 9 in the D2 direction are also uniform.

[0022] In this embodiment, the convex portions 8 and the convex portions 9 are alternately formed in the direction D2 between adjacent scorelines 6. This makes it possible to prevent the spin performance from being biased depending on the impact position within the face portion 2.

[0023] Second Embodiment In the first embodiment, the protrusion 8 is larger than the protrusion 9 in both the protrusion height and the width in the D2 direction, but either the protrusion height or the width in the D2 direction may be larger. In the example of FIG. 3(A), the relationship between the protrusion height H2 of the protrusion 8 and the protrusion height H3 of the protrusion 9 is H2=H3. On the other hand, the relationship between the width W2 of the protrusion 8 and the width W3 of the protrusion 9 is W2 > It's W3.

[0024] Furthermore, in the first embodiment, the convex portions 8 and the convex portions 9 are alternately formed in the direction D2 between adjacent score lines 6, but various arrangements of the convex portions 8 and the convex portions 9 can be adopted. In the example of FIG. 3(B), a plurality of convex portions 8 and a plurality of convex portions 9 are formed side by side in the direction D2. More specifically, these are arranged in the following order from the top line 4 side in the direction D2: convex portion 8 → convex portion 8 → convex portion 9 → convex portion 9 → convex portion 8 → convex portion 8. Arranging the convex portions 9 continuously in the direction D2 improves drainage and prevents clogging between the convex portions due to turf or the like.

[0025] Third Embodiment In FIG. 4, a plurality of recesses 11 are formed in a plurality of convex portions 7, recessed toward a reference plane 10 in the direction of the protruding height of the convex portions 7. The recesses 11 include recesses 12 formed in the convex portions 8 and recesses 13 formed in the convex portions 9. In other words, the recesses 11 collectively refer to the recesses 12 and 13. Water droplets adhering to the face portion 2 pass through the recesses 11 and cross the convex portions 7, thereby improving the drainage of the face portion 2. The improved drainage of the face portion 2 improves spin performance (the effect of suppressing the reduction in spin rate) in rainy weather, etc.

[0026] 5(A) is a cross-sectional view taken along line BB in FIG. 4, and FIG. 5(B) is a cross-sectional view taken along line CC in FIG. 4. In this embodiment, the depth of the recess 12 is equal to the protruding height of the protrusion 8. Therefore, the bottom surface of the recess 12 is located on the same plane as the reference surface 10, and the recess 12 divides the convex portion 8 partway in the D1 direction. Similarly, the depth of the concave portion 13 is equal to the protruding height of the convex portion 9. Therefore, the bottom surface of the concave portion 13 is located on the same plane as the reference surface 10, and the concave portion 13 divides the convex portion 9 partway in the D1 direction. Since the bottom surfaces of the concave portions 12 and 13 are located on the same plane as the reference surface 10, the drainage of water droplets that adhere to the face portion 2 and accumulate between adjacent convex portions can be improved.

[0027] As shown in FIG. 5(B), the distance S in the D1 direction between any adjacent recesses 12 on the same protrusion 8 is preferably 10 mm or less. This can suppress uneven drainage in the toe-heel direction. Although not shown, the recesses 13 are also similarly arranged on the same protrusion 8. 9 Any recess adjacent above 13 The distance between the recesses 12 and 13 in the direction D1 is preferably 10 mm or less. The width of the recesses 12 and 13 in the direction D2 is, for example, 15 μm or more and 100 μm or less.

[0028] The multiple recesses 11 are formed in a continuous pattern across the entire face portion 2. By forming the multiple recesses 11 in a continuous pattern, it is possible to make the drainage of the face portion 2 uniform and to prevent bias in spin performance depending on the impact position within the face portion 2. It also improves the design of the face portion 2. Figure 6(A) shows the pattern that forms the basis of this. The pattern of this embodiment is configured by using symbol 11a as one unit and arranging these symbols 11a regularly in the D1 and D2 directions. Recesses 11 are formed in the areas where this pattern overlaps with the multiple protrusions 7.

[0029] Symbol 11a is configured in a Y-shape by a vertical line extending in the D2 direction and two inclined lines branching from the vertical line and inclining in opposite directions. Therefore, the recesses 11 are located either on imaginary line L1, which overlaps the vertical line, or on imaginary lines L2 and L3, which overlap the inclined lines. Note that imaginary line L2 is an imaginary line inclined from the toe side to the heel side from the leading edge 3 toward the top line 7. Also, imaginary line L3 is an imaginary line inclined from the heel side to the toe side from the leading edge 3 toward the top line 4 and intersects with imaginary line L2. The drainage performance of the face 2 can be prevented from changing significantly whether the golf club head 1 is hit with the face 2 open or closed toward the target. Furthermore, when the face 2 is hit with the face 2 open or closed toward the target, the edges of the recesses 11 are more likely to catch the golf ball, improving spin performance.

[0030] <Fourth embodiment> In the third embodiment, the depth of the recessed portion 12 is equal to the protruding height of the protruding portion 8, but it may be shallower than the protruding height of the protruding portion 8. FIG. 6(B) is a cross-sectional view showing an example thereof, and corresponds to the cross-sectional view taken along line CC in FIG. 4. In the illustrated example, the bottom surface of the recessed portion 12 is located at a position higher than the reference plane 10 (at the top side of the protruding portion 8). Since the protruding portion 8 continues without interruption in the D1 direction, when hitting with the face portion 2 toward the target, it is possible to improve spin performance while maintaining the drainage properties of the recessed portion 12. Although not illustrated, the depth of the recessed portion 13 may also be shallower than the protruding height of the protruding portion 9. The depths of the recessed portion 12 and the recessed portion 13 may be different.

[0031] Fifth Embodiment When forming a plurality of recesses 11 in a continuous pattern, the basic pattern is not limited to the example shown in Fig. 6(A) Figures 7 and 8 are external views of golf club heads 1 having different basic patterns.

[0032] 9(A) shows the pattern that is the basis for the multiple recesses 11 formed in a continuous pattern in the example of FIG. 7. The illustrated pattern is configured by regularly arranging the figures 11b in the D1 and D2 directions, with each figure 11b being one unit. Recesses 11 are formed in the areas where this pattern overlaps with the multiple protrusions 7.

[0033] The figure 11b is a polygon, particularly a quadrilateral, and is a parallelogram. Each side of the figure 11b extends in a direction intersecting with the D2 direction. The imaginary lines L4 and L5 are imaginary lines that overlap with the long sides of the figure 11b and are inclined with respect to the D1 direction. The plurality of recesses 11 include recesses located on the imaginary lines L4 and L5. The imaginary line L4 is a line extending from the leading edge 3 side to the top line 4The imaginary line L5 is an imaginary line that slopes from the toe side to the heel side from the leading edge 3 side toward the top line 4 side and intersects with the imaginary line L4. Whether the golf club head 1 is used with the face portion 2 open toward the target or closed for impact, the drainage performance of the face portion 2 can be prevented from changing significantly. Furthermore, whether the face portion 2 is used with the face portion 2 open toward the target or closed for impact, the edge of the recess 11 is more likely to catch on the golf ball, improving spin performance.

[0034] The shape of the figure 11b may be a rectangle or a square other than a parallelogram, and may be a triangle, a pentagon, a hexagon, a circle, or an ellipse other than a square.

[0035] Next, Fig. 9(B) shows the pattern that served as the basis for the multiple recesses 11 formed in a continuous pattern in the example of Fig. 8. The illustrated pattern is composed of two types of regularly bent folded lines 11c and 11d shown in Fig. 9(C). The pattern of Fig. 9(B) is composed of multiple folded lines 11c regularly arranged in the D1 direction and multiple folded lines 11d regularly arranged in the D2 direction. Recesses 11 are formed in the areas where this pattern overlaps with multiple protrusions 7.

[0036] The fold lines 11c and 11d are generally inclined relative to the D1 direction, and the inclinations of these fold lines are different, and the fold lines 11c and 11d intersect in the pattern shown in Fig. 9(B). The intersections of the many fold lines 11c and 11d form a network of water channels, improving drainage.

[0037] Sixth Embodiment In the third to fifth embodiments, the design efficiency of the golf club head 1 can be improved by quantifying the relationship between the number of convex portions 7 and the number of concave portions 11 between two adjacent scorelines 6 and using this as an index. FIG. 10(A) is an explanatory diagram of one example. In the illustrated example, three convex portions 8 and six convex portions 9 are formed between two adjacent scorelines 6. The total number of convex portions 7 is nine. In addition, three concave portions 12 and two concave portions 13 are formed.

[0038] At any position in the D1 direction, a virtual reference line extending in the D2 direction is drawn so as to cross two score lines 6, and the number of convex portions 7 intersecting the virtual reference line is defined as X, and the number of concave portions 11 intersecting the virtual reference line is defined as Y. The index Z is defined as Z=Y / X. (A) In this example, three virtual reference lines L11 to L13 are illustrated.

[0039] At the virtual reference line L11, the index Z = 2 / 9 ≈ 0.22. At the virtual reference line L12, the index Z = 0 / 9 = 0. At the virtual reference line L13, the index Z = 3 / 9 ≈ 0.33.

[0040] In the example of FIG. 10(B), three convex portions 8 and four convex portions 9 are formed between two adjacent score lines 6. The total number of convex portions 7 is seven. Also, three concave portions 12 and two concave portions 13 are formed. In the example of FIG. 10(B), three virtual reference lines L21 to L23 are illustrated.

[0041] At the virtual reference line L21, the index Z = 2 / 7 ≈ 0.29. At the virtual reference line L22, the index Z = 0 / 7 = 0. At the virtual reference line L23, the index Z = 3 / 7 ≈ 0.43.

[0042] In terms of spin performance, the total number of convex portions 7 between two adjacent score lines 6 is preferably seven or more. On the other hand, in terms of the space between two adjacent score lines 6, drainage, and clogging, The total number of convex portions 7 between two adjacent score lines 6 is preferably nine or less. From the viewpoint of achieving both drainage performance and spin performance, in the D2 direction, it is preferable that there are positions where there are no recesses 11, positions where there are few recesses 11, and positions where there are many recesses 11. For example, as in the examples of FIGS. 10(A) and 10(B), it is preferable that there are positions (L12, L22) where there are no recesses 11, positions (L11, L21) where there are few recesses 11, and positions (L13, L23) where there are many recesses 11.

[0043] From such a viewpoint, when a virtual reference line is drawn at an arbitrary position in the D2 direction, the indices Z1 to Z3 are Z1 = 0, 0.22 < Z2 < 0.29, or 0.33 < Z3 < 0.43 It becomes like this. By setting the number of convex portions 7 and the number of recesses 11 in the D2 direction so as to be composed only of these three index ranges, and making the distance S in the D1 direction between any adjacent recesses 11 on the same convex portion 7 10 mm or less as described above, it is possible to obtain a surface structure in which the bias of spin performance and drainage performance due to the hitting position is suppressed.

[0044] <Seventh Embodiment> Next, a method for forming the convex portions 7 and the recesses 11 will be described. The golf club head 1 is manufactured, for example, by forging or casting a primary molded product without the convex portions 7 and the recesses 11. Next, the convex portions 7 and the recesses 11 are formed on the primary molded product. Thereafter, painting or surface treatment is performed to complete the golf club head 1. The primary molded product may have the score lines 6 formed thereon, or may not have the score lines 6 formed thereon. When the primary molded product does not have the score lines 6, the score lines 6 can also be formed when forming the convex portions 7 and the recesses 11. The primary molded product may be a single member or a plurality of members. In the case of a plurality of members, for example, the primary molded product may be composed of a face forming member that forms the face portion 2 and a head body that forms portions other than the face portion 2. In this case, after forming the convex portions 7 and the recesses 11 on the face forming member, the face forming member and the head body may be assembled.

[0045] The protrusions 7 and recesses 11 can be formed by laser processing or cutting. Figures 11(A) and 11(B) illustrate an example in which the protrusions 7 and recesses 11 are formed by laser processing. A primary molded article 1' in which the protrusions 7 and recesses 11 have not yet been formed is fixed to a laser irradiation device (not shown) via a jig 100. The laser irradiation device has a laser light irradiation unit 101. While the face portion 2 is irradiated with laser light by the irradiation unit 101, the face portion 2 (primary molded article 1') or the irradiation unit 101 can be moved relatively to form the protrusions 7 and recesses 11.

[0046] 11(C) illustrates an example in which the protrusions 7 and recesses 11 are formed by cutting. The primary molded product 1' is fixed to an NC milling machine via a jig 100. The NC milling machine has a spindle 102 that is driven to rotate around the Z axis, and a cutting tool (end mill) is attached to the lower end of the spindle 102. As in the case of laser processing, the protrusions 7 and recesses 11 are formed by moving the face portion 2 (primary molded product 1') or the cutting tool relatively.

[0047] After forming the protrusions 7 and recesses 11, it is preferable to perform a surface treatment to increase the hardness of the face portion 2. Examples of such surface treatments include carburizing, nitriding, soft nitriding, PVD (Physical Vapor Deposition), ion plating, DLC (Diamond-Like Carbon), and plating. In particular, surface treatments such as carburizing and nitriding that modify the surface without forming a separate metal layer on the surface are preferable. The surface of the face portion 2 may be coated with a plating layer.

[0048] Although the embodiments of the invention have been described above, the invention is not limited to the above-described embodiments, and various modifications and variations are possible within the scope of the gist of the invention. [Explanation of symbols]

[0049] 1 golf club head, 2 face portion, 6 score line, 7-9 convex portion, 11-12 concave portion

Claims

1. A face portion; a plurality of score lines formed on the face portion and extending in a toe-heel direction; a plurality of protrusions formed on the face portion, protruding from a reference plane including each edge of the plurality of score lines and extending in the toe-heel direction; the plurality of convex portions include a first convex portion and a second convex portion formed between adjacent score lines, the first convex portion has a larger protrusion height and a larger width in a direction perpendicular to the toe-heel direction than the second convex portion; The plurality of protrusions are formed with a plurality of recesses recessed toward the reference surface in a protrusion height direction of the protrusions, The plurality of recesses include a recess having a bottom surface positioned higher than the reference surface. A golf club head characterized by:

2. 2. The golf club head according to claim 1, the first convex portions and the second convex portions are alternately formed between the adjacent score lines in the orthogonal direction; A golf club head characterized by:

3. 2. The golf club head according to claim 1, a total of seven to nine of the first convex portions and the second convex portions are formed between adjacent score lines; A golf club head characterized by:

4. 2. The golf club head according to claim 1, The distance in the toe-heel direction between adjacent recesses on the same convex portion is 10 mm or less. A golf club head characterized by:

5. 2. The golf club head according to claim 1, the plurality of recesses include a plurality of recesses located on a virtual line inclined with respect to the orthogonal direction, A golf club head characterized by:

6. 2. The golf club head according to claim 1, the plurality of recesses include a plurality of recesses located on a plurality of imaginary lines inclined with respect to the orthogonal direction, The plurality of virtual lines are: a first imaginary line inclined from the toe side to the heel side from the leading edge side toward the top line side; a second imaginary line that slopes from the heel side to the toe side from the leading edge side toward the top line side and intersects with the first imaginary line, A golf club head characterized by:

7. 2. The golf club head according to claim 1, The plurality of recesses are formed in a continuous pattern. A golf club head characterized by:

8. 2. The golf club head according to claim 1, The plurality of recesses are formed in a continuous pattern of symbols. A golf club head characterized by:

9. 2. The golf club head according to claim 1, The plurality of recesses are formed in a continuous polygonal pattern. A golf club head characterized by:

10. 2. The golf club head according to claim 1, The plurality of recesses are formed in a continuous pattern of regularly bent lines. A golf club head characterized by:

11. 2. The golf club head according to claim 1, The plurality of recesses are formed in a continuous pattern of a plurality of regularly bent lines, the plurality of broken lines includes a first broken line and a second broken line intersecting the first broken line; A golf club head characterized by:

12. 5. The golf club head according to claim 4, When a virtual line is drawn in the orthogonal direction so as to cross between the adjacent score lines, and the number of intersections of the virtual line and the convex portion is defined as X, and the number of intersections of the virtual line and the concave portion is defined as Y, then for the virtual line at any position in the toe-heel direction, Y / X=0, 0.22<Y / X<0.29, or 0.33<Y / X<0.43 That is, A golf club head characterized by:

Images