JP5950065B1 - Golf club head - Google Patents

Abstract

An object of the present invention is to appropriately control the amount of backspin applied to a ball to improve the flight distance. A fall suppression unit is provided at a position of the head main body 12 located behind the face part 14 to suppress the fall of the face part 14 at the time of hitting a ball. The elastic deformation part 40 is provided at a position of the head main body 12 positioned behind the fall prevention part 38 and promotes the fall of the face part 14. The elastic deformation part 40 is located behind the fall prevention part 38. It is provided at the location of the sole portion 24 that performs. When the golf club head 10 hits the ball, the fall suppressing portion 38 suppresses the fall with the position of the leading edge 42 of the face portion 14 as a fulcrum, while the elastic deformation portion 40 promotes the fall of the face portion 14. The face portion 14 is deformed so as to fall backward with the elastic deformation portion 40 as a fulcrum. [Selection] Figure 3

Description

  The present invention relates to a golf club head.

  As a cavity-type iron golf club head, by providing a groove extending along the cavity side surface of the sole part along the face part, the deformation of the sole part at the time of hitting is promoted, and the deflection amount of the face part is increased. There has been proposed one that secures improvement and improves flight distance (see Patent Document 1).

Japanese Patent No. 3658393

However, in the above prior art, it has been found that the trajectory of the ball hitting position where the ball contacts the face surface is displaced downward with the lapse of time because the face part is deformed backward when hitting.
Therefore, the backspin is excessively applied to the ball due to the gear effect applied to the ball from the face surface, and thus the hit ball tends to be blown up (to increase excessively). There is room for improvement in improving distance.
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a golf club head that is capable of appropriately controlling the amount of backspin applied to the ball and improving the flight distance. There is.

To achieve the above object, the invention according to claim 1 includes a face portion having a vertical height and extending in a toe heel direction, and a face back body extending rearward from an upper portion of the face portion, A sole portion extending rearward from a lower portion of the face portion, and a face that is a rear end of the head body between a toe side edge and a heel side edge of the face portion between the face back body and the sole portion A golf club head comprising a head body including a side portion extending through a back rear end portion , wherein the face back body extends in the toe heel direction from the upper portion of the face portion to the rear of the face portion. The rear wall portion extending downward, and the lower end of the rear wall portion and the face bar while extending in the toe heel direction and positioned at the lowest position relative to the remaining portions of the face back main body. A lower wall portion connecting the rear end portion and a standing wall portion rising from the rear end of the lower wall portion, the lower wall portion side end portion of the back wall portion as a front wall portion, When the lower wall portion side end portion of the standing wall portion is used as a rear wall portion, the front wall portion and the rear wall portion are substantially parallel to face each other, and the fall of the face portion during hitting is suppressed. A fall-suppressing portion is formed at the side portion located between the rear of the back wall portion and the front of the standing wall portion and above the lower wall portion, and the upper portion of the face portion is the face An elastically deformable portion that promotes the tilting of the face portion in a direction that is displaced backward with respect to the lower portion of the portion; a boundary portion between the front wall portion and the lower wall portion; and the rear wall portion and the lower wall portion. It is comprised including the part of the boundary of this.
In the invention according to claim 2, the width between the front wall portion and the rear wall portion is 3 mm or more and 6 mm or less, and the depth from the upper end of the front wall portion to the lower wall portion is 2 mm or more and 6 mm or less. It is characterized by being.
According to a third aspect of the present invention, in a reference state in which the golf club head is installed at a predetermined lie angle and loft angle with respect to a horizontal plane, the golf club head includes a normal passing through the center point of the face surface and is orthogonal to the horizontal plane. When the cross section obtained by breaking the head main body in a plane to be used is a face center reference cross section, the elastic deformation portion extends in the toe heel direction around the face center reference cross section and extends along the toe heel direction of the elastic deformation portion. The length is 30 mm or more.
According to a fourth aspect of the present invention, a weight portion having a mass of 10% or more and less than 30% of the total mass of the head main body is provided at a position of the head main body behind the elastic deformation portion. Features.
The invention according to claim 5 includes a normal passing through the center point of the face surface and orthogonal to the horizontal plane in a reference state in which the golf club head is installed at a predetermined lie angle and loft angle with respect to the horizontal plane. When the cross section obtained by breaking the head body in a plane to be taken as a face center reference cross section, when the leading edge and the elastically deforming portion are projected on the horizontal plane in the face center reference cross section, 10 mm or more rearward from the leading edge The elastic deformation portion is located within a range of 30 mm or less.
The invention according to claim 6 includes a normal line passing through a center point of the face surface and perpendicular to the horizontal plane in a reference state in which the golf club head is installed at a predetermined lie angle and loft angle with respect to the horizontal plane. A section obtained by breaking the head main body in a plane to be used is a face center reference section, a plane perpendicular to the face center reference section and the horizontal plane is a reference vertical plane, and the elastic deformation portion is projected onto the reference vertical when the elastic deformation portion is projected. The deformation part is located in the range of 0 mm or more and 18 mm or less upward from the horizontal plane.
The invention according to claim 7 includes a normal line passing through a center point of the face surface and orthogonal to the horizontal plane in a reference state in which the golf club head is installed at a predetermined lie angle and loft angle with respect to the horizontal plane. A cross-section obtained by breaking the head main body at a plane to be used as a face center reference cross-section, and a point at which a normal of the face surface passing through the center of gravity of the golf club head intersects the face surface is defined as a center-of-gravity point on the face surface. The height from the center of gravity on the face surface to the center of gravity on the face surface is defined as the height of center of gravity on the face surface FGH, and the height from the horizontal plane to the uppermost position of the head body in the reference center of the face center Then, the height of the center of gravity on the face surface is 40% or more and 60% or less of the head height.

According to the first aspect of the present invention, at the time of hitting the ball, the fall suppressing portion suppresses the fall with the position of the leading edge of the face portion as a fulcrum, while the elastic deformation portion positioned below the fall suppressing portion causes the face portion to The face part is deformed so as to fall backward with the elastic deformation part as a fulcrum.
Therefore, since the distance that the hit point position locus on the face surface moves downward with time is extremely small, the gear effect acting on the ball from the face surface is suppressed, and the backspin amount applied to the ball is appropriately controlled. Therefore, it is advantageous to suppress the blow-up of the hit ball.
Therefore, it is advantageous in improving the flight distance by ensuring a high launch angle and appropriately controlling the backspin amount.
In addition, it is advantageous in easily configuring the fall prevention portion and the elastic deformation portion.
According to the second to seventh aspects of the present invention, since the amount by which the face part tilts with the elastically deforming part as a fulcrum can be secured, the flying distance is improved by securing a high launch angle and appropriately controlling the backspin amount. More advantageous on the above.

1 is a front view of a golf club head according to a first embodiment as viewed from the front of a face surface. It is A arrow directional view of FIG. FIG. 5 is a cross-sectional view of a face center reference cross section Pfc broken along a plane X in FIG. 1. It is a first explanatory view showing a method for defining the center point Pc of the face surface. It is the 2nd explanatory view showing the regulation method of center point Pc of a face surface. It is a 3rd explanatory view which shows the prescription | regulation method of the center point Pc of a face surface. It is the 4th explanatory view showing the regulation method of center point Pc of a face surface. FIG. 3 is a cross-sectional view of a golf club head showing a relationship between a gravity center G0 of the golf club head and a gravity center FG on the face surface. It is a front view of the golf club head for explaining the definition of the contour line I of the face surface. It is sectional drawing of the golf club head explaining the definition of the outline I of a face surface. It is a front view of the golf club head explaining the definition of the center point Pc of the face surface. (A) is sectional drawing of the iron type golf club head of the comparative example which does not have a fall suppression part and an elastic deformation part, (B) is a golf club head of a comparative example, immediately after hitting a ball and immediately before a ball leaves | separates. It is explanatory drawing which shows the change of a shape. It is explanatory drawing which shows the change of the shape of a head main body immediately after hitting in a 1st embodiment, and immediately before a ball leaves | separates. (A) is a figure which shows an example of the result of having measured the position of the face surface and hitting point locus | trajectory with time passage from the time immediately after hitting a ball until it leaves | separates from a face part in a comparative example, (B) is 1st implementation. FIG. 6 is a diagram illustrating an example of a result of measuring a face surface position and a hit point position trajectory from when a ball is released to a face part immediately after hitting, with time. It is sectional drawing of the face center reference | standard cross section Pfc of the golf club head based on 2nd Embodiment. It is the front view which looked at the golf club head concerning a 3rd embodiment from the front of the face. It is A arrow directional view of FIG. FIG. 17 is a cross-sectional view of a face center reference cross section Pfc broken along a plane X in FIG. 16. It is a figure which shows the evaluation result of Experimental example 1 to Experimental example 12. FIG. It is a figure which shows the evaluation result of Experimental example 13 to Experimental example 23. FIG. It is a figure which shows the evaluation result of Experimental example 24 to Experimental example 34. FIG. (A) is a sectional view of the golf club head of Experimental Example 3, (B) is a sectional view of the golf club head of Experimental Example 4, (C) is a sectional view of the golf club head of Experimental Example 8, and (D) is an experiment. Sectional view of golf club head of example 10, (E) is a sectional view of golf club head of experimental example 11. FIG. (A) is a sectional view of the golf club head of Experimental Example 14, (B) is a sectional view of the golf club head of Experimental Example 15, (C) is a sectional view of the golf club head of Experimental Example 24, and (D) is an experiment. Sectional view of golf club head of example 25, (E) is a sectional view of golf club head of experimental example 28. FIG. (A) is a sectional view of the golf club head of Experimental Example 35, (B) is a sectional view of the golf club head of Experimental Example 36, (C) is a sectional view of the golf club head of Experimental Example 37, and (D) is an experiment. 42 is a cross-sectional view of the golf club head of Example 38. FIG. It is an exploded view of the golf club head of a composite structure, and shows a state in plan view.

(First embodiment)
Next, embodiments of the present invention will be described with reference to the drawings.
First, a case where the golf club head is an iron golf club head having a hollow structure will be described.

As shown in FIGS. 1 to 3, the golf club head 10 includes a head main body 12, and the head main body 12 includes a face portion 14, a back face portion 16, a blade portion 18, a side portion 20, and a sole portion. 24, a weight portion 22 and a hosel 26.
As shown in FIG. 1, the face portion 14 has a vertical height and extends in the toe heel direction, and the front surface of the face portion 14 is a face surface 14A on which a ball is hit.
The face surface 14A is provided with a plurality of score lines 28 extending in the left-right direction at intervals in the vertical direction.
The back face part 16 is opposed to the face part 14 behind the face part 14 and has a vertical height and extends to the left and right.
The blade part 18 connects the upper part of the face part 14 and the upper part of the back face part 16.
The side portion 20 includes a toe side portion 2002 that connects a toe side portion of the face portion 14 and a toe side portion of the back face portion 16, a heel side portion of the face portion 14, and the back face portion 16. The heel side portion 2004 is connected to the heel side portion.
The sole part 24 connects the lower part of the face part 14 and the lower part of the back face part 16 and extends rearward from the back face part 16, and the lower surface of the sole part 24 is a sole surface 24A.
In the present embodiment, the head body 12 has a hollow structure in which the inside surrounded by the face portion 14, the blade portion 18, the side portion 20, the back face portion 16, and the sole portion 24 is a hollow portion 31. Yes.
The weight portion 22 is provided at a position of the head main body 12 behind the elastic deformation portion 40 to be described later, and the weight portion 22 is configured by a portion of the head main body 12 positioned behind the elastic deformation portion 40. Yes.
The weight portion 22 has a mass of 10% or more and less than 30% of the total mass of the head body 12.
In addition, a cavity portion 30 is configured in a space surrounded by the back face portion 16, the side portion 20, and the weight portion 22.
The hosel 26 is erected at a position near the heel direction of the blade portion 18, and one end of the shaft axis S is inserted into and attached to the hosel 26, whereby the shaft axis is coupled to the golf club head 10.
In the figure, reference numeral 32 indicates a toe, and reference numeral 34 indicates a heel.

The portion of the golf club head 10 excluding the face portion 14 is integrally formed of a metal material such as a titanium alloy, stainless steel, or carbon steel.
The face portion 14 is formed of a metal material such as a titanium alloy, stainless steel, carbon steel, or maraging steel.

(Center point of face surface 14A)
Next, a method for defining the center point Pc of the face surface 14A will be described.
The center point Pc of the face surface 14A is the geometric center of the face surface 14A, and the center point Pc is defined by various conventionally known methods including the first definition method and the second definition method exemplified below. The method can be adopted.
In the following description, the case where the golf club head 10 is made of wood will be described, but the same method can be applied even if the golf club head 10 is made of iron.

[A] First defining method of the center point Pc of the face surface 14A:
This is a method of defining the center point Pc when the boundary between the face surface 14A and another golf club head 10 portion is clear, in other words, when the periphery of the face surface 14A is specified by a ridgeline. In this case, the face surface 14A is clearly defined.
4 to 7 are explanatory views showing a method for defining the center point Pc of the face surface 14A.

(1) First, as shown in FIG. 4, the golf club head 10 is placed on the horizontal plane HP so that the lie angle and the face angle become specified values. The state of the golf club head 10 at this time is set as a reference state. Note that the set values of the lie angle and the face angle are values described in a product catalog, for example.

(2) Next, a temporary center point c0 in a direction connecting the crown portion 36 (a blade portion in the case of an iron) and the sole portion 24 is obtained.
That is, as shown in FIG. 4, a perpendicular line f0 is drawn that intersects the approximate center point of a line parallel to the horizontal plane HP connecting the toe 32 and the heel 34 (hereinafter referred to as a horizontal line).
The midpoint of the point a0 where the perpendicular f0 and the upper edge of the face surface 14A intersect and the midpoint of the point b0 where the perpendicular f0 and the lower edge of the face surface 14A intersect are defined as a temporary center point c0.

(3) Next, as shown in FIG. 5, a horizontal line g0 passing through the temporary center point c0 is drawn.
(4) Next, as shown in FIG. 6, the d0 point where the horizontal line g0 and the edge on the toe 32 side of the face surface 14A intersect, and the e0 point where the horizontal line g0 and the edge on the heel 34 side of the face surface 14A intersect. The midpoint is defined as a temporary center point c1.

(5) Next, as shown in FIG. 7, a perpendicular line f1 passing through the temporary center point c1 is drawn, and the perpendicular line f1 and the upper edge of the face surface 14A intersect with each other, and the perpendicular line f1 and the lower edge of the face surface 14A The midpoint of the b1 point where the two intersect is defined as the temporary center point c2.
Here, if the temporary center points c1 and c2 match, that point is defined as the center point Pc of the face surface 14A.
If the temporary center points c1 and c2 do not match, the procedures (2) to (5) are repeated.
Since the face surface 14A has a curved surface, the length of the horizontal line g0 and the lengths of the vertical lines f0 and f1 when obtaining the midpoint of the horizontal line g0 and the midpoints of the vertical lines f0 and f1 are the curved surfaces of the face surface 14A. The length along the line shall be used.
The face center line CL is defined by a straight line passing through the center point Pc and extending in a direction perpendicular to the toe 32-heel 34 direction.

[B] Second defining method of the center point Pc of the face surface 14A:
Next, the definition of the center point Pc when the periphery of the face surface 14A and the other golf club head 10 portions are connected by a curved surface and the face surface 14A cannot be clearly defined will be described.

As shown in FIG. 8, the golf club head 10 is hollow, the symbol G0 indicates the center of gravity of the golf club head 10, and the symbol Lp is a straight line connecting the center of gravity G0 and the center of gravity FG on the face surface. The straight line Lp is a perpendicular of the face surface 14A passing through the center of gravity G0.
That is, a point obtained by projecting the center of gravity G0 of the golf club head 10 onto the face surface 14A is the on-face center of gravity point FG.
Here, as shown in FIG. 9, a large number of planes H1, H2, H3,.

In a cross section when the golf club head 10 is broken along each of the planes H1, H2, H3,..., Hn, the curvature radius r0 of the outer surface of the golf club head 10 is measured as shown in FIG.
When measuring the curvature radius r0, it is assumed that there is no face line, punch mark or the like on the face surface 14A.
The curvature radius r0 is continuously measured from the center point Pc of the face surface 14A in the outward direction (upward and downward in FIG. 10).
Then, in the measurement, a portion where the radius of curvature r0 is initially equal to or smaller than a predetermined value is defined as an outline I representing the periphery of the face surface 14A.
The predetermined value is, for example, 200 mm.
A region surrounded by the contour line I determined based on a large number of planes H1, H2, H3,..., Hn is defined as a face surface 14A as shown in FIGS.

Next, as shown in FIG. 11, the golf club head 10 is placed on the horizontal ground (horizontal plane HP) so that the lie angle and the face angle become specified values.
The straight line LT passes through the toe side point PT of the face surface 14A and extends in the vertical direction.
The straight line LH passes through the heel side point PH of the face surface 14A and extends in the vertical direction.
The straight line LC is parallel to the straight line LT and the straight line LH. The distance between the straight line LC and the straight line LT is equal to the distance between the straight line LC and the straight line LH.
Reference symbol Pu indicates an upper point of the face surface 14A, and reference symbol Pd indicates a lower point of the face surface 14A. The upper point Pu and the lower point Pd are both intersections of the straight line LC and the contour line I.
The center point Pc is defined by the midpoint of the line segment connecting the upper point Pu and the lower point Pd.

Next, each part of the golf club head 10 will be described in detail.
As shown in FIG. 1 to FIG. 3, the golf club head 10 is set to a reference state in which the golf club head 10 is installed at a predetermined lie angle and loft angle with respect to the horizontal plane HP.
In the reference state, a cross section in which the head body 12 is broken along a plane X that includes a normal passing through the center point Pc of the face surface 14A and is orthogonal to the horizontal plane HP is defined as a face center reference cross section Pfc. In other words, the face center reference cross section Pfc is a cross section in which the head main body 12 is broken along a plane X including the face center line CL and orthogonal to the horizontal plane HP in the reference state, and FIG. 3 shows the face center reference cross section Pfc. Yes.

In the present embodiment, as shown in FIG. 3, the head main body 12 is provided with a fall prevention portion 38 and an elastic deformation portion 40.
The fall prevention unit 38 is provided at a position of the head main body 12 positioned behind the face unit 14 and suppresses the fall of the face unit 14 at the time of hitting a ball.
In the present embodiment, the collapse suppression portion 38 is configured by the blade portion 18 and the back face portion 16. In other words, the collapse suppression portion 38 is provided across the back surface 14 </ b> B of the face portion 14 and the sole portion 24. .

  The elastic deformation part 40 is provided at a position of the head main body 12 positioned behind the fall prevention part 38 and promotes the fall of the face part 14. The elastic deformation part 40 is located behind the fall prevention part 38. It is provided at a location of the sole portion 24 to be performed. The details of the elastic deformation portion 40 will be described later.

Here, the operation of the collapse suppression unit 38 and the elastic deformation unit 40 will be described.
FIG. 12A is a cross-sectional view of a conventional iron-type golf club head (hereinafter referred to as a comparative example) that does not have the collapse suppression portion 38 and the elastic deformation portion 40, and corresponds to FIG. In addition, the same code | symbol is attached | subjected to the location similar to FIG.
FIG. 12B is an explanatory diagram showing a change in the shape of the head body 12 immediately after hitting and immediately before the ball leaves in the golf club head 10 ′ of the comparative example.
FIG. 13 is an explanatory diagram showing changes in the shape of the head main body 12 immediately after hitting and immediately before the ball leaves in the golf club head 10 according to the present embodiment.
In FIGS. 12B and 13, the solid line indicates the shape of the head main body 12 immediately after hitting, and the two-dot chain line indicates the shape of the head main body 12 immediately before the ball leaves.
When a ball is hit with the conventional golf club head 10 shown in FIG. 12A, the face portion 14 is deformed so as to fall backward with the position of the leading edge 42 as a fulcrum as shown in FIG. 12B.
On the other hand, when the ball is hit with the golf club head 10 of the present embodiment shown in FIG. 3, the fall suppressing portion 38 suppresses the fall with the position of the leading edge 42 of the face portion 14 as a fulcrum as shown in FIG. On the other hand, the fall of the face portion 14 is promoted by the elastic deformation portion 40, and therefore the face portion 14 is deformed so as to fall backward with the elastic deformation portion 40 as a fulcrum.

FIGS. 14A and 14B are views of the face surface 14A of the comparative golf club head 10 ′ and the golf club head 10 of the present embodiment, from the point immediately after the ball is hit to when the ball is separated from the face part 14, respectively. It is a figure which shows an example of the result of having measured a position and a hit point position locus with progress of time. In the figure, the symbol Pi indicates the hit point position, and the line connecting the hit point position Pi indicates the hit point position locus.
In the figure, the position of the face surface 14A moves from the right side to the left side of the paper with time.
As shown in FIG. 14A, in the comparative example, the face portion 14 falls backward with the position of the leading edge 42 as a fulcrum, so that it can be seen that the hit point position locus moves downward with time.
Here, the loft angle immediately before the ball leaves the face surface 14A is 28.8 °, and the amount of change in the loft angle that changes according to the trajectory of the hitting point position is −3.6 °.

On the other hand, as shown in FIG. 14B, in the present embodiment, the face portion 14 falls backward with the elastic deformation portion 40 as a fulcrum, so that the face portion 14 falls backward and simultaneously displaces upward. From this, it can be seen that the distance that the hit point position trajectory moves downward with time is extremely small.
Here, the loft angle immediately before the ball leaves the face surface 14A is 27.7 °, and the change amount of the loft angle that changes depending on the trajectory of the hitting point position is −0.7 °.
Therefore, if the launch angle = the amount of change of the loft angle + the loft angle, the launch angle is as follows in the comparative example and the present embodiment.
Launch angle of comparative example = 28.8 ° + (− 3.6 °) = 25.2 °
Launch angle of embodiment = 27.7 ° + (− 0.7 °) = 27.0 °
As described above, it can be seen that the golf club head 10 of the present embodiment is more advantageous in securing the launch angle than the comparative example.
Further, in the golf club head 10 of the present embodiment, since the hit point position trajectory has a very short distance to move downward with time, the gear effect acting on the ball from the face surface 14A is suppressed and applied to the ball. Since the amount of backspin that can be controlled can be appropriately controlled, it is advantageous to suppress the blow-up of the hit ball.
Therefore, it is advantageous in improving the flight distance by ensuring a high launch angle and appropriately controlling the backspin amount.

Next, the definition of each part of the golf club head 10 will be described.
(Thin part)
As shown in FIG. 3, in the present embodiment, the elastic deformation portion 40 is a thin wall having a thickness t that is 25% or more and 50% or less of the thickness T of the sole portion 24 where the elastic deformation portion 40 is not provided. A portion 2402 is formed.
If the thickness t of the thin portion 2402 is within the above range, the amount by which the face portion 14 tilts with the elastically deforming portion 40 as a fulcrum can be secured. Therefore, the flying angle is secured by ensuring a high launch angle and appropriately controlling the backspin amount. This is more advantageous for improving the distance.
If the thickness t of the thin portion 2402 is less than the above range, the deformation of the elastic deformation portion 40 becomes too large, and the hit point position trajectory on the face surface 14A at the time of hitting the ball excessively suppresses the distance that moves downward over time. The amount of backspin imparted to the ball is too suppressed, and the effect of securing the flight distance is reduced.
When the thickness t of the thin portion 2402 exceeds the above range, it is difficult to secure the amount by which the face portion 14 is tilted with the elastic deformation portion 40 as a fulcrum, ensuring a high launch angle and appropriately controlling the backspin amount. The effect of improving the efficiency is reduced.

(groove)
Further, a groove 44 extending in the toe heel direction is formed in the sole portion 24, and the thin portion 2402 is configured by the bottom of the groove 44.
The groove 44 may be formed on the upper surface 24B of the sole portion 24, on the sole surface 24A, or on both sides.
Further, the width in the front-rear direction of the groove 44 is set to 1 mm or more and 7 mm or less.
If the width Wg of the groove 44 is within the above range, the amount by which the face portion 14 can be tilted with the elastic deformation portion 40 as a fulcrum can be secured. Therefore, the flying distance can be reduced by ensuring a high launch angle and appropriately controlling the backspin amount. This is more advantageous for improvement.
When the width Wg of the groove 44 is less than the above range, it is difficult to secure the amount by which the face portion 14 falls with the elastic deformation portion 40 as a fulcrum, and the flying distance is improved by ensuring a high launch angle and appropriately controlling the backspin amount. The effect of aiming at is reduced.
If the width Wg of the groove 44 exceeds the above range, the deformation of the elastically deforming portion 40 becomes too large, and the distance at which the hit point position locus on the face surface 14A at the time of hitting the ball moves downward with time is excessively suppressed. The amount of backspin imparted to the surface is excessively suppressed, and the effect of securing the flight distance is reduced.

Further, the depth Dg of the groove 44 is 1 mm or more and 6 mm or less.
When the depth Dg of the groove 44 is within the above range, the amount by which the face portion 14 can be tilted with the elastic deformation portion 40 as a fulcrum can be secured. Therefore, the flying distance is ensured by ensuring a high launch angle and appropriately controlling the backspin amount. This is more advantageous for improving the quality.
When the depth Dg of the groove 44 is less than the above range, it is difficult to ensure the amount by which the face portion 14 is tilted with the elastic deformation portion 40 as a fulcrum, ensuring a high launch angle and appropriately controlling the backspin amount. The effect of improving is reduced.
If the depth Dg of the groove 44 exceeds the above range, the deformation of the elastic deformation portion 40 becomes too large, and the hit point position trajectory on the face surface 14A at the time of hitting the ball excessively suppresses the distance that moves downward over time. The amount of backspin imparted to the ball is too suppressed, and the effect of securing the flight distance is reduced.

(Length of elastic deformation portion 40)
As shown in FIGS. 1 and 3, in the reference state of the golf club head 10, the elastic deformation portion 40 extends in the toe heel direction around the face center reference cross section Pfc, and extends along the toe heel direction of the elastic deformation portion 40. The length L was set to 30 mm or more. Note that the upper limit of the length L of the elastic deformation portion 40 is the length of the sole portion 24 in the toe heel direction.
If the length L of the elastically deforming portion 40 is 30 mm or more, the amount by which the face portion 14 can be tilted with the elastically deforming portion 40 as a fulcrum can be secured. This is more advantageous for improving the distance.
If the length L of the elastically deforming portion 40 is less than 30 mm, it is difficult to secure the amount by which the face portion 14 falls with the elastically deforming portion 40 as a fulcrum, ensuring a high launch angle and appropriately controlling the backspin amount. The effect of improving the efficiency is reduced.

(Position in the front-rear direction of the elastic deformation portion 40)
As shown in FIG. 3, in the reference state of the golf club head 10, when the leading edge 42 and the elastically deforming portion 40 are projected on the horizontal plane HP in the face center reference cross section Pfc, they are 10 mm or more and 30 mm or less rearward from the leading edge 42. The elastic deformation portion 40 is positioned within the range.
If the position of the elastic deformation portion 40 in the front-rear direction is within the above range, the amount by which the face portion 14 can be tilted with the elastic deformation portion 40 as a fulcrum can be secured, so that the launch angle is secured high and the backspin amount is appropriately controlled. This is more advantageous for improving the flight distance.
If the position of the elastic deformation portion 40 in the front-rear direction is less than the above range, the distance between the face portion 14 and the elastic deformation portion 40 is too close, so that the hit point position locus on the face surface 14A at the time of hitting moves downward with time. Therefore, the effect of suppressing the backspin amount imparted to the ball is reduced, and the effect of securing the flight distance is reduced.
If the position of the elastic deformation portion 40 in the front-rear direction exceeds the above range, the amount by which the face portion 14 falls with the elastic deformation portion 40 as a fulcrum decreases, so the effect of securing the launch angle is reduced and the flight distance is secured. descend.

(Vertical position of the elastic deformation portion 40)
As shown in FIG. 3, when the golf club head 10 is in the reference state, a plane perpendicular to the face center reference cross section Pfc and the horizontal plane HP is set as a reference vertical plane VP, and the elastic deformation portion 40 is projected to the reference vertical. 40 is located above the horizontal plane HP within a range of 0 mm to 18 mm. Note that the lower limit of the vertical position of the elastic deformation portion 40 is a position 0 mm upward from the horizontal plane HP.
If the position of the elastic deformation portion 40 in the vertical direction is within the above range, it is possible to reliably suppress the distance that the hit point position locus on the face surface 14A moves downward over time when hitting a ball. The amount can be suppressed, which is more advantageous in securing the flight distance.
If the position of the elastic deformation portion 40 in the vertical direction exceeds the above range, it becomes difficult to suppress the distance that the hit point position locus on the face surface 14A moves downward with time, so the amount of back spin applied to the ball And the effect of securing the flight distance is reduced.

(Height center of gravity on the face FGH)
As shown in FIG. 3, in the reference state of the golf club head 10, the point where the normal of the face surface 14A passing through the center of gravity G0 of the golf club head 10 intersects the face surface 14A is defined as the center of gravity FG on the face surface, and the horizontal plane. The height from HP to the center of gravity on the face surface is defined as the height of center of gravity on the face surface FGH.
Further, in the face center reference cross section Pfc, when the height from the horizontal plane HP to the uppermost position of the head main body 12 is the head height Hh, the center-of-face center point height FGH is 40 of the head height Hh. % To 60%.
When the center of gravity height FGH on the face surface is within the above range, it is advantageous to bring the hit point and the center of gravity height FGH on the face surface close to each other, the backspin amount applied to the ball can be controlled appropriately, and the flight distance It is more advantageous in securing
If the center-of-gravity point height FGH on the face surface is below the above range, the hitting point tends to be positioned above the center-of-face center point height FGH, and the golf club head 10 rotates upward about the center of gravity point when hitting a ball. Since the gear effect caused by this acts on the ball, the backspin amount is reduced and the effect of securing the flight distance is reduced.
If the center-of-gravity point height FGH on the face surface exceeds the above range, the hitting point tends to be positioned below the center-of-face center-of-gravity point height FGH, and the golf club head 10 rotates downward about the center of gravity point when hitting a ball. As a result, the face surface 14A faces downward.
For this reason, it is difficult to suppress the distance that the hit point position locus on the face surface 14A moves downward with the passage of time at the time of hitting, so the effect of suppressing the amount of backspin applied to the ball is reduced and the flight distance is secured. descend.

(Mass of weight part 22)
As described above, the weight portion 22 having a mass of 10% or more and less than 30% of the total mass of the head main body 12 is provided at a position of the head main body 12 behind the elastic deformation portion 40.
When the mass of the weight portion 22 is within the above range, the deformation of the elastic deformation portion 40 is promoted by the inertial force of the weight portion 22 at the time of hitting the ball, so that the hit point position locus on the face surface 14A at the time of hitting the ball with time elapses. Since the distance to move downward can be reliably suppressed, the amount of backspin imparted to the ball can be suppressed, which is more advantageous in securing the flight distance.
If the mass of the weight portion 22 falls below the above range, the inertial force of the weight portion 22 at the time of hitting the ball is reduced, so that the deformation of the elastically deforming portion 40 is difficult to be promoted, and the hit point position locus on the face surface 14A at the time of hitting the ball is Since it becomes difficult to suppress the distance that moves downward as time elapses, the effect of suppressing the amount of backspin applied to the ball is reduced, and the effect of securing the flight distance is reduced.
If the mass of the weight portion 22 exceeds the above range, the inertia force of the weight portion 22 at the time of hitting the ball becomes excessive, so that the deformation of the elastically deforming portion 40 becomes excessively large, and the hit point position locus on the face surface 14A at the time of hitting the ball is Since the distance that moves downward with the passage of time is excessively suppressed, the amount of backspin applied to the ball is excessively suppressed, and the effect of securing the flight distance is reduced.

(Second Embodiment)
Next, a second embodiment will be described with reference to FIG. In the following embodiments, the same parts and members as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, the description thereof is omitted, and different parts are mainly described. To do.
The second embodiment is different from the first embodiment in that the shape of the golf club head 10 is not a hollow structure.
A peripheral edge portion 17A extending in the toe heel direction is formed along the upper portion of the back surface 14B of the face portion 14, and a blade portion 18 is formed at the peripheral edge portion 17A.
Further, a peripheral edge portion 17B extending from both ends of the peripheral edge portion 17A along both side portions of the back surface 14B of the face portion 14 in the toe heel direction and connected to both sides of the weight portion 22 in the toe heel direction is formed.
The sole portion 24 extends rearward from the lower portion of the face portion 14, and the lower surface of the sole portion 24 is a sole surface 24A.
The weight portion 22 is formed to bulge upward from the rear portion of the sole portion 24 located rearward of the elastic deformation portion 40, and extends in the toe heel direction.
Further, a cavity portion 30 is configured by a space surrounded by the face portion 14, the peripheral edge portions 17 </ b> A and 17 </ b> B, and the weight portion 22.

Similar to the first embodiment, the head main body 12 is provided with the fall prevention portion 38 and the elastic deformation portion 40.
In the second embodiment, the collapse suppression portion 38 is configured by a support wall portion 46 that is provided across the face back surface 14B and the upper surface of the sole portion 24 and extends in the toe heel direction.
The elastic deformation portion 40 is provided at the location of the sole portion 24 located behind the location where the support wall portion 46 and the upper surface 24B of the sole portion 24 are connected.
As in the first embodiment, the elastically deforming portion 40 is a thin portion 2402 having a thickness t that is 25% or more and 50% or less of the thickness T of the portion of the sole portion 24 where the elastically deforming portion 40 is not provided. Is formed.

Further, the length L of the elastic deformation portion 40, the position of the elastic deformation portion 40 in the front-rear direction, the position of the elastic deformation portion 40 in the vertical direction, the center of gravity height FGH on the face surface, and the mass of the weight portion 22 are It is defined similarly to the embodiment.
In the second embodiment as well, as in the first embodiment, when the ball is hit, the fall suppression unit 38 suppresses the fall with the position of the leading edge 42 of the face portion 14 as a fulcrum. On the other hand, the face portion 14 is deformed so as to fall backward with the elastic deformation portion 40 as a fulcrum.
Accordingly, since the gear effect acting on the ball from the face surface 14A is suppressed, it is advantageous in improving the flight distance by ensuring a high launch angle and appropriately controlling the backspin amount.

(Third embodiment)
Next, a third embodiment will be described.
In the third embodiment, a case where the golf club head 10 is a utility type golf club head having a hollow structure will be described.
As shown in FIGS. 16 to 18, the head main body 12 includes a face portion 14, a face back main body 36 , a face back rear end portion 48, a sole portion 24, a side portion 20, a weight portion 22, and a hosel. 26.
The face back body 36 and the face back rear end portion 48 constitute a face back.
The face portion 14 has a vertical height and extends to the left and right.
The face back main body 36 extends rearward from the upper portion of the face portion 14.
The sole portion 24 extends rearward from the lower portion of the face portion 14.
The side portion 20 extends between the toe side edge and the heel side edge of the face portion 14 through the face back rear end portion 48 between the face back main body 36 and the sole portion 24.
The head body 12 has a hollow structure in which the inside surrounded by the face part 14, the face back body 36 , the sole part 24, and the side part 20 is a hollow part 31.
The face back body 36 is provided with a hosel 26 that is connected to the shaft S at a position close to the heel 34 on the face surface 14A side.
The weight portion 22 is provided at a position of the head main body 12 behind the elastic deformation portion 40 described later, and has a mass of 10% or more and less than 30% of the total mass of the head main body 12.
In the present embodiment, the weight portion 22 is constituted by a portion of the head main body 12 located behind the elastic deformation portion 40 and extends in the toe heel direction.

The head main body 12 is provided with a fall prevention portion 38 and an elastic deformation portion 40.
The fall prevention portion 38 is formed by the side portion 20 located closer to the face portion 14.
The elastic deformation portion 40 is provided at a location of the face back main body 36 located below the collapse suppression portion 38.

More specifically, the face back body 36 has a rear wall portion that extends in the toe heel direction from the upper portion of the face portion 14 to the rear of the face portion 14, and the remaining face back body 36. The lower wall portion 3602 that connects the lower end of the back wall portion and the face back while extending in the toe heel direction and the standing wall portion that stands up from the rear end of the lower wall portion 3602 is provided.
When the end on the lower wall 3602 side of the back wall is the front wall 3604 and the end on the lower wall 3602 side of the standing wall is the rear wall 3606, the front wall 3604 and the rear wall 3606 are opposed to each other in parallel.
And the fall suppression part 38 is comprised in the location of the side part 20 located above the low-order wall part 3602 between the back of a back wall part, and the front of a standing wall part.
That is, the portion of the face back body 36 located below the collapse suppressing portion 38, the upper surface portion of the face back body 36, extends most located lower Touhiru direction compared to the position of rest of the face back body 36 A lower wall 3602 is provided.
A front wall portion 3604 that stands up from the front end of the lower wall portion 3602 and extends in the toe heel direction and a rear wall portion 3606 that stands up from the rear end of the lower wall portion 3602 and extend in the toe heel direction are provided.
The elastic deformation portion 40 includes a boundary portion between the front wall portion 3604 and the lower wall portion 3602 and a boundary portion between the rear wall portion 3606 and the lower wall portion 3602.

(Width between front wall portion 3604 and rear wall portion 3606)
In the present embodiment, the width Wk between the front wall portion 3604 and the rear wall portion 3606 is set to 3 mm or more and 6 mm or less.
If the width Wk between the front wall portion 3604 and the rear wall portion 3606 is within the above range, the amount by which the face portion 14 can be tilted with the elastic deformation portion 40 as a fulcrum can be secured. It is more advantageous to improve the flight distance by appropriately controlling.
When the width Wk between the front wall portion 3604 and the rear wall portion 3606 is less than the above range, it is difficult to secure the amount by which the face portion 14 falls with the elastically deforming portion 40 as a fulcrum, ensuring a high launch angle and reducing the backspin amount. Proper control reduces the effect of improving the flight distance.
If the width Wk between the front wall portion 3604 and the rear wall portion 3606 exceeds the above range, the deformation of the elastic deformation portion 40 becomes excessively large, and the hit point position locus on the face surface 14A at the time of hitting the ball is downward with time. Since the moving distance is excessively suppressed, the backspin amount applied to the ball is excessively suppressed, and the effect of securing the flight distance is reduced.

(Depth from the upper end of the front wall portion 3604 to the lower wall portion 3602)
Further, the depth Dk from the upper end of the front wall portion 3604 to the lower wall portion 3602 was set to 2 mm or more and 6 mm or less.
When the depth Dk from the upper end of the front wall portion 3604 to the lower wall portion 3602 is within the above range, the face portion 14 can secure an amount of tilting with the elastic deformation portion 40 as a fulcrum, so that a high launch angle can be secured and back spin. It is more advantageous to improve the flight distance by appropriately controlling the amount.
When the depth Dk from the upper end of the front wall portion 3604 to the lower wall portion 3602 is below the above range, it is difficult to secure the amount by which the face portion 14 falls with the elastically deforming portion 40 as a fulcrum, ensuring a high launch angle and back spin amount. The effect of improving the flight distance is reduced by appropriately controlling.
When the depth Dk from the upper end of the front wall portion 3604 to the lower wall portion 3602 exceeds the above range, the deformation of the elastic deformation portion 40 becomes excessively large, and the hit point position locus on the face surface 14A at the time of hitting the ball is lowered with time. Therefore, the backspin amount imparted to the ball is excessively suppressed, and the effect of securing the flight distance is reduced.

Further, the length of the elastic deformation portion 40, the position of the elastic deformation portion 40 in the front-rear direction, the position of the elastic deformation portion 40 in the vertical direction, the center of gravity height FGH on the face surface, and the mass of the weight portion 22 are It is defined in the same way as
In the third embodiment as well, as in the first embodiment, when the ball is hit, the gear effect acting on the ball from the face surface 14A is suppressed, so a high launch angle is secured. It is advantageous for improving the flight distance by appropriately controlling the backspin amount.

In the above embodiment, the case where the head main body 12 has a structure made of a metal material has been described. However, as described below, the head main body 12 includes a metal and a carbon fiber reinforced structure. It may have a composite structure composed of a non-metallic material such as a synthetic resin (CFRP: Carbon Fiber Reinforced Plastics).
That is, as shown in FIG. 25, the head main body 12 has a hollow structure, the face back main body 36 has an opening 37, and the opening 37 is located at a position near the face of the face back main body 36 after face back. It is provided over a portion close to the end portion 48 and from a portion close to the toe of the face back body 36 to a portion close to the heel.
The face back main body 36 has a cover member 50 that covers the opening 37 by being joined to the outer periphery of the opening 37. The cover member 50 and the head body 12 are joined together by an adhesive.
The head main body 12 is formed of a metal material, and the cover member 50 is formed of a low-rigidity material that is lower in rigidity than the head main body 12.
As such a low-rigidity material, fiber-reinforced resin materials such as carbon fiber (carbon fiber-reinforced resin material) and various conventionally known materials can be used.

The head main body 12 is provided with a fall prevention portion 38 and an elastic deformation portion 40.
The fall prevention portion 38 is formed by the side portion 20 located closer to the face portion 14.

The elastic deformation portion 40 is provided at a location of the face back main body 36 located behind the collapse suppression portion 38.
That is, in the face back main body 36 located behind the fall-preventing portion 38, in the place excluding the cover member 50, in other words, in the place of the face back main body 36 adjacent to the cover member 50 and the cover member 50. A lower wall portion 3602, a front wall portion 3604, and a rear wall portion 3606 are provided at a portion of the face back body 36 adjacent to the heel.
The lower wall portion 3602 has the upper surface portion of the face back main body 36 positioned at the lowest position as compared with the remaining portions of the face back main body 36 and extends in the toe heel direction.
The front wall portion 3604 rises from the front end of the lower wall portion 3602 and extends in the toe heel direction.
The rear wall portion 3606 stands up from the rear end of the lower wall portion 3602 and extends in the toe heel direction.
The elastic deformation portion 40 includes a boundary portion between the front wall portion 3604 and the lower wall portion 3602 and a boundary portion between the rear wall portion 3606 and the lower wall portion 3602.
The same effects as those of the above-described embodiment are also achieved in a golf club head including such a composite structure head body 12.

Hereinafter, experimental examples of the present invention will be described.
19, 20, and 21 are diagrams showing experimental results of the golf club head 10 according to the present invention.
A golf club head 10 as a sample was prepared for each experimental example, and four evaluation items described later were measured to obtain an index (evaluation score), and a total score of the four indices was determined.

(1) Launch angle A golf club equipped with the golf club head 10 was installed in a swing robot, an actual strike test was performed under the following conditions, the launch angle at 9 strike points was measured, and the average launch angle was evaluated by an index. The index of Experimental Example 1 is set to 100, and the larger the index, the larger the launch angle and the better the evaluation.
Head speed: 40m / s
The hitting positions were 9 hits in total, and the ball was hit 5 times at each hitting point.
Three strike points: a center point Pc of the face surface 14A, a point separated by 7 mm from the center point Pc in the toe direction on a straight line passing through the center point Pc and orthogonal to the face center line CL, and a point separated by 7 mm in the heel direction.
A point 5 mm away from the center point Pc in the direction of the face back body 36 on the face center line CL, and a point 5 mm away from the above point in the toe direction on the upper 5 mm line passing through this point and orthogonal to the face center line CL. , 3 strike points, 7mm apart in the heel direction.
On the face center line CL, a point 5 mm away from the center point Pc in the direction of the sole portion 24, and a point 5 mm away from the above point in the toe direction on the lower 5 mm line passing through this point and orthogonal to the face center line CL; 3 strike points, 7mm apart in the heel direction.
The index of Experimental Example 1 is set to 100, and the larger the index, the higher the resilience and the better the evaluation.

(2) Spin amount Based on the spin amount (back spin amount) obtained in the actual hit test at the hitting point position, the index of Experimental Example 1 is set to 100, and the larger the index, the larger the spin amount and the better the evaluation. Show.

(3) Initial speed The average value of the initial speed obtained in the actual hit test at the hitting point position was evaluated by an index. The index of Experimental Example 1 is 100, and the larger the index, the faster the initial speed and the better the evaluation.

(4) Flight distance The average value of the flight distance obtained in the actual hit test at the hitting point position was evaluated by an index. The index of Experimental Example 1 is set to 100, and the greater the index, the greater the flight distance and the better the evaluation.

(5) Total score The sum of the four indices of launch angle, spin rate, initial speed, and flight distance described above was defined as the total score.
The total score of Experimental Example 1 is set to 400, and the larger the total score, the better the evaluation.

Next, experimental examples 1 to 38 will be described with reference to FIGS. 19 and 20.
As shown in FIG. 12, Experimental Example 1 corresponds to a comparative example and does not satisfy the definition of claim 1 of the present invention.
Experimental Examples 2 to 34 are within the scope of the present invention and satisfy Claim 1.

As shown in FIG. 22 (A), Experimental Example 2 corresponds to the iron-type golf club head according to the first embodiment, and includes all of claims 1, 2, 3, 4, 7-11. It satisfies.
Therefore, the launch angle 140, the spin rate 140, the initial speed 100, the flight distance 140, and the total point 520 are obtained, and all the evaluations are high.

Experimental example 3 corresponds to the utility type golf club head of the third embodiment, and satisfies all of claims 1, 2, 5, 6, and 7-11.
Therefore, the launch angle 140, the spin rate 140, the initial speed 100, the flight distance 140, and the total point 520 are obtained, and all the evaluations are high.

Experimental Example 4 corresponds to the iron-type golf club head of the first embodiment, as shown in FIG. 22 (B), and is defined in claims 1, 2, 3, 4, 7-11. Claim 4 is not satisfied.
That is, the depth Dg of the groove 44 is 8 mm, which exceeds the range of 1 mm to 6 mm.
Therefore, the launch angle is 100, the spin amount is 106, the initial speed is 102, the flying distance is 102, and the total point is 410. Although all evaluations are higher than the experimental example 1, the evaluation is lower than the experimental example 2. Yes.

Experimental example 5 corresponds to the iron-type golf club head of the first embodiment, and does not satisfy claim 4 among claims 1, 2, 3, 4, 7-11.
That is, the width Wg in the front-rear direction of the groove 44 is 9 mm, which exceeds the range of 1 mm to 7 mm in claim 4.
Further, the depth Dg of the groove 44 is 8 mm, which exceeds the range of 1 mm to 6 mm in claim 4.
Therefore, the launch angle is 100, the spin amount is 105, the initial speed is 103, the flying distance is 101, and the total point is 409. Although all the evaluations are the experimental example 1 or more, the evaluation is lower than the experimental example. Yes.

Experimental Example 6 corresponds to the iron type golf club head of the first embodiment, and satisfies all of claims 1, 2, 3, 4, 7 to 11.
However, the width Wg in the front-rear direction of the groove 44 is 3 mm, which is close to the lower limit of the range of 1 mm to 7 mm.
Further, the depth Dg of the groove 44 is 2 mm, which is close to the lower limit value in the range of 1 mm to 6 mm.
Therefore, the launch angle 138, the spin amount 135, the initial speed 100, the flight distance 124, and the total point 497 are obtained, and the evaluations of the launch angle, spin amount, flight distance, and total point do not satisfy Claim 4. Is over.

Experimental example 7 corresponds to the iron-type golf club head of the first embodiment, and satisfies all of claims 1, 2, 3, 4, 7-11.
However, the width Wg in the front-rear direction of the groove 44 is 7 mm, which is the upper limit value in the range of 1 mm to 7 mm.
Further, the depth Dg of the groove 44 is 6 mm, which is the upper limit value in the range of 1 mm to 6 mm.
Therefore, the launch angle 141, the spin amount 137, the initial speed 100, the flying distance 126, and the total point 504 are obtained, and the evaluations of the launch angle, the spin amount, the flying distance, and the total point do not satisfy Claim 4. Is over.

Experimental Example 8 corresponds to the iron-type golf club head of the first embodiment, as shown in FIG. 22 (C), and is out of claims 1, 2, 3, 4, 7-11 Claim 4 is not satisfied.
That is, the width Wg in the front-rear direction of the groove 44 is 9 mm, which exceeds the range of 1 mm to 7 mm in claim 4.
Therefore, the launch angle is 100, the spin rate is 111, the initial speed is 100, the flight distance is 102, and the total point is 413. Although all evaluations are higher than experimental example 1, the evaluation is lower than experimental example 2. Yes.

Experimental example 9 corresponds to the iron-type golf club head of the first embodiment, and does not satisfy claim 4 among claims 1, 2, 3, 4, 7-11.
That is, the depth Dg of the groove 44 is 8 mm, which exceeds the range of 1 mm to 6 mm.
Therefore, the launch angle is 100, the spin rate is 115, the initial speed is 100, the flying distance is 105, and the total point is 420. Although all evaluations are higher than experimental example 1, the evaluation is lower than experimental example 2. Yes.

Experimental Example 10 corresponds to the utility type golf club head according to the third embodiment as shown in FIG. 22 (D), and is defined in claims 1, 2, 5, 6, 7-11. Claim 6 is not satisfied.
That is, the depth Dk from the upper end of the front wall portion 3604 to the lower wall portion 3602 is 1 mm, which is below the range of 2 mm to 6 mm in claim 6.
Further, the width Wk between the front wall portion 3604 and the rear wall portion 3606 is 2 mm, which is below the range of 3 mm or more and 6 mm or less.
Therefore, the launch angle 105, the spin amount 105, the initial speed 100, the flight distance 103, and the total point 413 are obtained. Although all evaluations are higher than or equal to experimental example 1, the evaluation is lower than experimental example 3. Yes.

Experimental Example 11 corresponds to the utility type golf club head of the third embodiment, as shown in FIG. 22 (E), and is out of claims 1, 2, 5, 6, 7-11. Claim 6 is not satisfied.
That is, the depth Dk from the upper end of the front wall portion 3604 to the lower wall portion 3602 is 7 mm, which exceeds the range of 2 mm to 6 mm in claim 6.
Moreover, the width Wk between the front wall part 3604 and the rear wall part 3606 is 8 mm, and exceeds the range of 3 mm or more and 6 mm or less.
Therefore, the launch angle 102, the spin amount 105, the initial speed 100, the flight distance 102, and the total point 409 are obtained. Although all the evaluations are equal to or higher than the experimental example 1, the evaluation is lower than the experimental example 3. Yes.

Experimental example 12 corresponds to the utility type golf club head of the third embodiment, and satisfies all of claims 1, 2, 5, 6, 7-11.
However, the width Wk between the front wall portion 3604 and the rear wall portion 3606 is 6 mm, which is an upper limit value in the range of 3 mm to 6 mm.
Therefore, the launch angle 132, the spin amount 132, the initial speed 100, the flight distance 121, and the total point 485 are obtained, and the evaluation of the launch angle, the spin amount, the initial speed, the flight distance, and the total point does not satisfy Claim 6. , 11 is exceeded.

Experimental example 13 corresponds to the utility type golf club head of the third embodiment, and satisfies all of claims 1, 2, 5, 6, and 7-11.
However, the depth Dk from the upper end of the front wall portion 3604 to the lower wall portion 3602 is 6 mm, which is the upper limit value in the range of 2 mm to 6 mm.
Therefore, the launch angle 132, the spin amount 132, the initial speed 100, the flight distance 121, and the total point 485 are obtained, and the evaluation of the launch angle, the spin amount, the initial speed, the flight distance, and the total point does not satisfy Claim 6. , 11 is exceeded.

Experimental example 14 corresponds to the utility type golf club head of the third embodiment as shown in FIG. 23 (A). Claim 6 is not satisfied.
That is, the width Wk between the front wall portion 3604 and the rear wall portion 3606 is 1 mm, which is below the range of 3 mm or more and 6 mm or less.
Therefore, the launch angle 104, the spin rate 103, the initial speed 100, the flight distance 102, and the total point 409 are obtained. Although all the evaluations are equal to or higher than the experimental example 1, the evaluation is lower than the experimental example 3. Yes.

Experimental Example 15 corresponds to the utility type golf club head of the third embodiment, as shown in FIG. 23 (B), and is out of claims 1, 2, 5, 6, 7-11. Claim 6 is not satisfied.
That is, the depth Dk from the upper end of the front wall portion 3604 to the lower wall portion 3602 is 7 mm, which exceeds the range of 2 mm to 6 mm in claim 6.
Therefore, the launch angle 109, the spin amount 107, the initial speed 100, the flight distance 105, and the total point 421 are obtained. Although all evaluations are higher than or equal to experimental example 1, the evaluation is lower than experimental example 3. Yes.

Experimental example 16 corresponds to the iron-type golf club head of the first embodiment, and does not satisfy claim 7 among claims 1, 2, 3, 4, 7-11.
That is, the length L of the elastically deformable portion 40 is 20 mm, which is less than the provision of 30 mm or more.
Therefore, the launch angle 104, the spin rate 103, the initial speed 100, the flight distance 102, and the total point 409 are obtained. Although all the evaluations are equal to or higher than the experimental example 1, the evaluation is lower than the experimental example 2. Yes.

Experimental example 17 corresponds to the iron-type golf club head of the first embodiment, and does not satisfy claim 7 among claims 1, 2, 3, 4, 7-11.
That is, the length L of the elastically deformable portion 40 is 25 mm, which is less than the provision of 30 mm or more.
Accordingly, the launch angle 125, the spin rate 123, the initial speed 100, the flight distance 122, and the total point 470 are obtained. Although all evaluations are higher than or equal to experimental example 1, the evaluation is lower than experimental example 2. Yes. However, the numerical value of each evaluation is improving rather than Experimental example 16 (length L = 20mm).

Experimental example 18 corresponds to the iron-type golf club head of the first embodiment, and satisfies all of claims 1, 2, 3, 4, 7-11.
That is, the length L of the elastically deformable portion 40 is 35 mm, which satisfies the requirement of 30 mm or more in claim 7.
Therefore, the launch angle 140, the spin rate 140, the initial speed 100, the flight distance 140, and the total point 520 are obtained, and all evaluations are the same as those in Experimental Example 2.

Experimental example 19 corresponds to the iron-type golf club head of the first embodiment, and satisfies all of claims 1, 2, 3, 4, 7-11.
That is, the length L of the elastically deformable portion 40 is 50 mm, which satisfies the requirement of 30 mm or more.
Therefore, the launch angle 140, the spin rate 140, the initial speed 100, the flight distance 140, and the total point 520 are obtained, and all evaluations are the same as those in Experimental Example 2.

Experimental example 20 corresponds to the iron-type golf club head of the first embodiment, and does not satisfy claim 8 among claims 1, 2, 3, 4, 7-11.
That is, the mass Ww of the weight portion 22 / the mass Wh of the head body is 5%, which is less than the range of 10% to 30% of the eighth aspect.
Therefore, the launch angle 110, the spin amount 110, the initial speed 100, the flight distance 107, and the total point 427 are obtained, and although all evaluations are higher than or equal to experimental example 1, the evaluation is lower than experimental example 2. Yes.

Experimental example 21 corresponds to the iron-type golf club head of the first embodiment, and does not satisfy claim 8 among claims 1, 2, 3, 4, 7-11.
That is, the mass Ww of the weight portion 22 / the mass Wh of the head main body is 35%, which exceeds the range of 10% to 30% of the eighth aspect.
Therefore, the launch angle 120, the spin rate 109, the initial speed 100, the flight distance 106, and the total point 435 are obtained. Although all evaluations are higher than or equal to experimental example 1, the evaluation is lower than experimental example 2. Yes.

Experimental example 22 corresponds to the iron-type golf club head of the first embodiment, and satisfies all of claims 1, 2, 3, 4, 7-11.
However, the mass Ww of the weight portion 22 / the mass Wh of the head body is 10%, which is the lower limit value in the range of 10% to 30% of claim 8.
Therefore, the launch angle 123, the spin amount 123, the initial speed 100, the flight distance 115, and the total point 461 are obtained, and the evaluation of the launch angle, spin amount, initial speed, flight distance, and total point does not satisfy Claim 8. , 21 is exceeded.

Experimental example 23 corresponds to the iron-type golf club head of the first embodiment, and satisfies all of claims 1, 2, 3, 4, and 7-11.
However, the mass Ww of the weight portion 22 / the mass Wh of the head main body is 30%, which is the upper limit value in the range of 10% to 30%.
Therefore, the launch angle 125, the spin amount 125, the initial speed 100, the flight distance 117, and the total point 467 are obtained, and the evaluation of the launch angle, spin amount, initial speed, flight distance, and total point does not satisfy Claim 8. , 21 is exceeded.

Experimental Example 24 corresponds to the iron-type golf club head of the first embodiment, as shown in FIG. Claim 9 is not satisfied.
That is, the position of the elastic deformation portion 40 in the front-rear direction (the position of the front end of the elastic deformation portion 40) is located at a position 8 mm rearward from the leading edge 42, and 10 mm or more 30 mm rearward from the leading edge 42 of claim 9. Below the range below.
Therefore, the launch angle 120, the spin amount 105, the initial speed 100, the flight distance 108, and the total point 433 are obtained. Although all evaluations are higher than or equal to experimental example 1, the evaluation is lower than experimental example 2. Yes.

Experimental Example 25 corresponds to the iron-type golf club head according to the first embodiment as shown in FIG. 23 (D), and is out of claims 1, 2, 3, 4, 7-11. Claim 9 is not satisfied.
That is, the position in the front-rear direction of the elastic deformation portion 40 (the position of the rear end of the elastic deformation portion 40) is located at a position 32 mm rearward from the leading edge 42, and 10 mm or more rearward from the leading edge 42 of claim 9. It exceeds the range of 30 mm or less.
Accordingly, the launch angle 109, the spin rate 109, the initial speed 100, the flight distance 106, and the total point 424 are obtained, and although all evaluations are higher than experimental example 1, the evaluation is lower than experimental example 2. Yes.

Experimental example 26 corresponds to the iron-type golf club head of the first embodiment, and satisfies all of claims 1, 2, 3, 4, 7-11.
However, the position in the front-rear direction of the elastically deformable portion 40 (the position of the front end of the elastically deformable portion 40) is located at a position 10 mm rearward from the leading edge 42, and 10 mm or more and 30 mm backward from the leading edge 42 of claim 9. The lower limit of the following range.
Therefore, the launch angle 130, the spin amount 130, the initial speed 100, the flight distance 120, and the total point 479 are obtained, and the evaluation of the launch angle, spin amount, initial speed, flight distance, and total point does not satisfy the ninth aspect. , More than 25.

Experimental example 27 corresponds to the iron-type golf club head of the first embodiment, and satisfies all of claims 1, 2, 3, 4, and 7-11.
However, the position of the elastic deformation part 40 in the front-rear direction (the position of the rear end of the elastic deformation part 40) is located 30 mm rearward from the leading edge 42, and 10 mm or more rearward from the leading edge 42 of claim 9. It is the upper limit of the range of 30 mm or less.
Therefore, the launch angle 132, the spin amount 132, the initial speed 100, the flight distance 121, and the total point 484 are obtained, and the evaluation of the launch angle, spin amount, initial speed, flight distance, and total point does not satisfy the ninth aspect. , More than 25.

Experimental example 28 corresponds to the utility type golf club head of the third embodiment as shown in FIG. 23 (E), and is defined in claims 1, 2, 5, 6, 7-11. Claim 10 is not satisfied.
That is, the vertical position of the elastic deformation portion 40 is 20 mm from the horizontal plane, which exceeds the range of 0 mm to 18 mm in claim 10.
Therefore, the launch angle 113, the spin amount 113, the initial speed 100, the flight distance 108, and the total point 433 are obtained. Although all the evaluations are equal to or higher than the experimental example 1, the evaluation is lower than the experimental example 3. Yes.

Experimental example 29 corresponds to the utility type golf club head of the third embodiment and satisfies all of claims 1, 2, 5, 6, and 7-11.
However, the position of the elastic deformation portion 40 in the vertical direction is 4 mm from the horizontal plane, and is close to the lower limit value in the range of 0 mm to 18 mm in claim 10.
Therefore, the launch angle 135, the spin amount 135, the initial speed 100, the flight distance 123, and the total point 492 are obtained, and the evaluation of the launch angle, the spin amount, the initial speed, the flight distance, and the total point does not satisfy Claim 10. Is over.

Experimental example 30 corresponds to the utility type golf club head of the third embodiment, and satisfies all of claims 1, 2, 5, 6, 7-11.
However, the position of the elastic deformation portion 40 in the vertical direction is 18 mm from the horizontal plane, which is the upper limit value in the range of 0 mm to 18 mm.
Therefore, the launch angle 127, the spin amount 127, the initial speed 100, the flight distance 118, and the total point 473 are obtained, and the evaluation of the launch angle, spin amount, initial speed, flight distance, and total point does not satisfy claim 10. Is over.

Experimental example 31 corresponds to the iron-type golf club head of the first embodiment, and does not satisfy claim 11 among claims 1, 2, 3, 4, 7-11.
That is, the center of gravity height FGH on the face surface is 35% of the head height Hh, which is lower than the range of 40% to 60% of claim 11.
Therefore, the launch angle 138, the spin rate 100, the initial speed 100, the flight distance 111, and the total point 449 are obtained, and although all the evaluations are the experimental example 1 or more, the evaluation is lower than the experimental example 2. Yes.

Experimental example 32 corresponds to the iron-type golf club head of the first embodiment, and does not satisfy claim 11 among claims 1, 2, 3, 4, 7-11.
That is, the center of gravity height FGH on the face surface is 65% of the head height Hh, which exceeds the range of 40% to 60% of claim 11.
Therefore, the launch angle 125, the spin rate 105, the initial speed 100, the flight distance 110, and the total point 440 are obtained. Although all evaluations are higher than or equal to experimental example 1, the evaluation is lower than experimental example 2. Yes.

Experimental example 33 corresponds to the iron-type golf club head of the first embodiment, and satisfies all of claims 1, 2, 3, 4, 7-11.
However, the center-of-gravity point height FGH on the face surface is 40% of the head height Hh, which is the lower limit of the range of 40% to 60% of claim 11.
Therefore, the launch angle 132, the spin amount 132, the initial speed 100, the flight distance 121, and the total point 485 are obtained, and the evaluation of the launch angle, spin amount, initial speed, flight distance, and total point does not satisfy Claim 11. , 32 is exceeded.

Experimental example 34 corresponds to the iron-type golf club head of the first embodiment, and satisfies all of claims 1, 2, 3, 4, 7-11.
However, the center of gravity height FGH on the face surface is 60% of the head height Hh, which is the upper limit of the range of 40% to 60% of claim 11.
Therefore, the launch angle 130, the spin amount 130, the initial speed 100, the flight distance 120, and the total point 480 are obtained, and the evaluation of the launch angle, spin amount, initial speed, flight distance, and total point does not satisfy claim 11. , 32 is exceeded.

Experimental Example 35 corresponds to the iron-type golf club head of the first embodiment, as shown in FIG. 24 (A), and is out of claims 1, 2, 3, 4, 7-11. The third aspect of the invention is not satisfied.
That is, the thickness t of the thin wall portion 2402 constituting the elastic deformation portion 40 is 20% of the wall thickness T of the portion of the sole portion 24 where the elastic deformation portion 40 is not provided. % Below the range.
Therefore, the launch angle 130, the spin amount 130, the initial speed 100, the flight distance 120, and the total point 480 are obtained, and although all evaluations are higher than experimental example 1, the evaluation is lower than experimental example 2. Yes.

Experimental Example 36 corresponds to the iron-type golf club head of the first embodiment, as shown in FIG. 24 (B), and is out of claims 1, 2, 3, 4, 7-11. The third aspect of the invention is not satisfied.
That is, the thickness t of the thin portion 2402 constituting the elastically deformable portion 40 is 55% of the thickness T of the portion of the sole portion 24 where the elastically deformable portion 40 is not provided. It is above the range of less than%.
Therefore, the launch angle 115, the spin amount 113, the initial speed 100, the flying distance 111, and the total point 439 are obtained, and although all evaluations are higher than experimental example 1, the evaluation is lower than experimental example 2. Yes.

Experimental Example 37 corresponds to the iron-type golf club head of the first embodiment as shown in FIG. 24 (C), and is out of claims 1, 2, 3, 4, 7 to 11 This does not satisfy claim 4.
That is, the width Wg in the front-rear direction of the groove 44 is 0.5 mm, which is less than the range of 1 mm to 7 mm.
Therefore, the launch angle 109, the spin amount 107, the initial speed 100, the flight distance 105, and the total point 421 are obtained. Although all evaluations are higher than or equal to experimental example 1, the evaluation is lower than experimental example 2. Yes.

Experimental Example 38 corresponds to the iron-type golf club head of the first embodiment, as shown in FIG. 24 (D), and is out of claims 1, 2, 3, 4, 7-11. This does not satisfy claim 4.
That is, the depth Dg of the groove 44 is 0.5 mm, which is less than the range of 1 mm or more and 6 mm or less.
Therefore, the launch angle 130, the spin amount 130, the initial speed 100, the flight distance 120, and the total point 480 are obtained, and although all evaluations are higher than experimental example 1, the evaluation is lower than experimental example 2. Yes.

Each evaluation item is examined below.
(1) Launch angle Experimental Examples 2, 6, 7, 18, 19, 22, 23, 26, 33 within the scope of the present invention and satisfying all of claims 1, 2, 3, 4, 7-11. 34, and Experimental Examples 3, 12, 13, 29, and 30 satisfying all of claims 1, 2, 5, 6, 7 to 11 have a launch angle of 127 to 140 and the launch angle is most excellent. Yes.
Examples 4, 5, 8-11, 14-17, 20 which are within the scope of the present invention and satisfy the provisions of claim 1 but do not satisfy any of the provisions of claims 2-11. 21, 24, 25, 28, 31, 32, 35 to 38 have a launch angle of 100 to 138 and the next best launch angle.
Therefore, what satisfies all of Claims 1, 2, 3, 4, 7 to 11 or all of Claims 1, 2, 5, 6, 7 to 11 within the scope of the present invention is within the scope of the present invention. The effect of improving the launch angle with respect to the outside is excellent.

(2) Spin amount Experimental examples 2, 6, 7, 18, 19, 22, 23, 26, 33, which satisfy all of claims 1, 2, 3, 4, 7 to 11 within the scope of the present invention. No. 34, and Examples 3, 12, 13, 29, and 30 satisfying all of claims 1, 2, 5, 6, and 7 to 11 have a spin amount of 123 to 140 and the highest spin amount. Yes.
Examples 4, 5, 8-11, 14-17, 20 which are within the scope of the present invention and satisfy the provisions of claim 1 but do not satisfy any of the provisions of claims 2-11. , 21, 24, 25, 28, 31, 32, 35 to 38 have a spin amount of 103 to 130 and the next best spin amount.
Therefore, what satisfies all of Claims 1, 2, 3, 4, 7 to 11 or all of Claims 1, 2, 5, 6, 7 to 11 within the scope of the present invention is within the scope of the present invention. The effect of improving the spin rate relative to the outside is excellent.

(3) Initial speed Examples 2, 6, 7, 18, 19, 22, 23, 26, 33, and 34 satisfying all of claims 1, 2, 3, 4, and 7 to 11 within the scope of the present invention. In Examples 3, 12, 13, 29, and 30 satisfying all of claims 1, 2, 5, 6, and 7 to 11, the initial speed is 100.
Examples 4, 5, 8-11, 14-17, 20 which are within the scope of the present invention and satisfy the provisions of claim 1 but do not satisfy any of the provisions of claims 2-11. , 21, 24, 25, 28, 31, 32, 35 to 38 have initial speeds of 100 to 103.
Therefore, those within the scope of the present invention do not decrease the initial speed compared to those outside the scope of the present invention.

(4) Flight distance Experimental examples 2, 6, 7, 18, 19, 22, 23, 26, 33, which are all within the scope of the present invention and satisfy all of claims 1, 2, 3, 4, 7-11. 34, and Examples 3, 12, 13, 29, and 30 satisfying all of claims 1, 2, 5, 6, and 7 to 11 have a flight distance of 115 to 140 and the best flight distance. Yes.
Examples 4, 5, 8-11, 14-17, 20 which are within the scope of the present invention and satisfy the provisions of claim 1 but do not satisfy any of the provisions of claims 2-11. 21, 24, 25, 28, 31, 32, 35 to 38 have a flight distance of 101 to 122 and the next best flight distance.
Therefore, what satisfies all of Claims 1, 2, 3, 4, 7 to 11 or all of Claims 1, 2, 5, 6, 7 to 11 within the scope of the present invention is within the scope of the present invention. The effect of improving the flight distance with respect to the outside is excellent.

(5) Total score Examples 2, 6, 7, 18, 19, 22, 23, 26, 33, which are all within the scope of the present invention and satisfy all of claims 1, 2, 3, 4, 7-11. 34, and Experimental Examples 3, 12, 13, 29, and 30 satisfying all of claims 1, 2, 5, 6, 7 to 11 have a total score of 461 to 520, and the total score is the most excellent Yes.
Examples 4, 5, 8-11, 14-17, 20 which are within the scope of the present invention and satisfy the provisions of claim 1 but do not satisfy any of the provisions of claims 2-11. , 21, 24, 25, 28, 31, 32, 35-38 have a total score of 409-480, which is the next best.
Therefore, what satisfies all of Claims 1, 2, 3, 4, 7 to 11 or all of Claims 1, 2, 5, 6, 7 to 11 within the scope of the present invention is within the scope of the present invention. The effect of improving the total score over the outside is excellent.

DESCRIPTION OF SYMBOLS 10 Golf club head 12 Head main body 14 Face part 14A Face surface 14B Back surface 16 Back face part 18 Blade part 20 Side part 2002 Toe side part 2004 Heel side part 22 Weight part 24 Sole part 24A Sole surface 24B Upper surface 26 Hosel 28 Score Line 30 Cavity portion 31 Hollow portion 32 Toe 34 Heel 36 Face back main body 3602 Lower wall portion 3604 Front wall portion 3606 Rear wall portion 38 Fall-down suppressing portion 40 Elastic deformation portion 42 Leading edge 44 Groove 46 Support wall portion 48 Face back rear end portion Wg Groove width in front and rear direction Dg Groove depth Wk Width between front wall portion and rear wall portion Dk Depth from upper end of front wall portion to lower wall portion L Length of elastic deformation portion Ww Weight of weight portion Mass Wh Mass of head body FGH Height of center of gravity on face Hh Head height

Claims (7)

A face portion having an upper and lower height and extending in a toe heel direction; a face back body extending rearward from an upper portion of the face portion; a sole portion extending rearward from a lower portion of the face portion; A head including a side portion extending between a toe side edge and a heel side edge of the face portion through a face back rear end portion which is a rear end of the head main body between the face back main body and the sole portion. A golf club head comprising a body,
The face back main body is positioned at the lowest position as compared with the rear wall portion extending downward while extending in the toe heel direction behind the face portion from the upper portion of the face portion, and the remaining portions of the face back main body. A lower wall portion connecting the lower end of the back wall portion and the rear end of the face back while extending in the toe heel direction, and an upright wall portion rising from the rear end of the lower wall portion,
When the lower wall portion side end portion of the back wall portion is a front wall portion, and the standing wall portion end portion on the lower wall portion side is a rear wall portion, the front wall portion and the rear wall portion are Substantially parallel to each other,
The fall suppressing portion that suppresses the fall of the face portion at the time of hitting is configured by the side portion located between the rear of the back wall portion and the front of the standing wall portion and above the lower wall portion. And
An elastic deformation part that promotes the tilting of the face part in a direction in which the upper part of the face part is displaced backward with respect to the lower part of the face part includes a boundary portion between the front wall part and the lower wall part and the rear part. It is configured including a boundary part between the wall part and the lower wall part,
A golf club head characterized by that.   The width between the front wall portion and the rear wall portion is 3 mm or more and 6 mm or less,
  The depth from the upper end of the front wall portion to the lower wall portion is 2 mm or more and 6 mm or less,
  The golf club head according to claim 1. In a reference state in which the golf club head is installed at a predetermined lie angle and loft angle with respect to a horizontal plane, the head body is broken at a plane that includes a normal passing through the center point of the face surface and is orthogonal to the horizontal plane. When the cross section is the face center reference cross section,
The elastic deformation portion extends in a toe heel direction centering on the face center reference cross section, and a length along the toe heel direction of the elastic deformation portion is 30 mm or more.
3. The golf club head according to claim 1, wherein A weight portion having a mass of 10% or more and less than 30% of the total mass of the head main body is provided at a position of the head main body behind the elastic deformation portion.
The golf club head according to any one of claims 1 to 3, wherein the golf club head is provided. In a reference state in which the golf club head is installed at a predetermined lie angle and loft angle with respect to a horizontal plane, the head body is broken at a plane that includes a normal passing through the center point of the face surface and is orthogonal to the horizontal plane. When the cross section is the face center reference cross section,
In the face center reference cross section, when the leading edge and the elastic deformation portion are projected onto the horizontal plane, the elastic deformation portion is located within a range of 10 mm or more and 30 mm or less rearward from the leading edge.
3. The golf club head according to claim 1, wherein In a reference state in which the golf club head is installed at a predetermined lie angle and loft angle with respect to a horizontal plane, the head body is broken at a plane that includes a normal passing through the center point of the face surface and is orthogonal to the horizontal plane. The cross section is the face center reference cross section,
A plane perpendicular to the face center reference cross section and the horizontal plane as a reference vertical plane;
When projecting the elastic deformation portion to the reference vertical,
The elastically deforming portion is located in a range of 0 mm or more and 18 mm or less upward from the horizontal plane.
3. The golf club head according to claim 1, wherein In a reference state in which the golf club head is installed at a predetermined lie angle and loft angle with respect to a horizontal plane, the head body is broken at a plane that includes a normal passing through the center point of the face surface and is orthogonal to the horizontal plane. The cross section is the face center reference cross section,
The point at which the normal of the face surface passing through the center of gravity of the golf club head intersects the face surface is the center of gravity on the face surface,
The height from the horizontal plane to the center of gravity on the face surface is defined as the height of center of gravity on the face surface FGH,
In the face center reference cross section, when the height from the horizontal plane to the uppermost position of the head body is the head height,
The center-of-gravity point height on the face surface is 40% or more and 60% or less of the head height,
3. The golf club head according to claim 1, wherein

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