JP5882523B1 - Golf club head - Google Patents

Abstract

[PROBLEMS] To improve the initial speed and ensure the launch angle when hitting a ball while improving the durability. A first connection angle α of a first flange portion 36 to a face portion 14 is set to 5? To 35 ?, and a second connection angle β of a second flange portion 38 to a crown portion 16 is set to 5? Where the width W of the first flange portion 36 is 5 mm or more and 25 mm or less, and the portion of the cover member 34 constituting the second flange portion 38 is located at the forefront in the face center reference cross section Pfc. Was positioned behind the maximum height point Kh. The first flange portion 36 and the first flange portion 36 and the second flange portion 38 can be relieved of stress acting on the joint portion between the head main body 12 and the cover member 34 and the deformation amount of the first flange portion 36 and the second flange portion 38 can be secured at the time of hitting. The shape of the two flange portions 38 was defined. [Selection] Figure 15

Description

  The present invention relates to a golf club head.

As a golf club head with a hollow structure, in order to secure the deflection amount of the face part, improve the initial speed at the time of hitting and secure the launch angle, an opening is provided in the head body, and it is made of a low rigidity material that is lower in rigidity than the head body. A member in which the formed member is joined to the outer periphery of the opening to cover the opening has been proposed (see Patent Documents 1 and 2).
However, in the above-described prior art, the stress at the time of hitting the ball locally acts on the joint portion between the head body and the member formed of the low rigidity material, so there is room for improvement in securing durability.
In view of this, it has been proposed to improve the durability by providing a boundary built-up portion in the portion of the head main body to which a member formed of a low-rigidity material is joined (see Patent Document 3).

JP 2006-212066 A JP 2005-278757 A Japanese Patent No. 5401798

However, if the head body is provided with a boundary built-up portion, the rigidity of the head body is increased, so that the amount of deflection of the face portion during hitting is ensured despite the provision of a member made of a low-rigidity material. There is a problem that decreases.
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 advantageous in improving the initial velocity at the time of hitting and securing the launch angle while improving the durability. It is to provide.

In order to achieve the above object, the invention according to claim 1 includes a face portion having a vertical height and extending left and right, a crown portion extending rearward from an upper portion of the face portion, and the face. A sole portion extending rearward from a lower portion of the portion, and a side portion extending through the face back between the toe side edge and the heel side edge of the face portion between the crown portion and the sole portion. Including a head body including a cover member that is formed of a low-rigidity material having lower rigidity than the head body and is bonded to an outer periphery of the opening provided in the crown, and covers the opening. A golf club head having a hollow portion surrounded by a face portion, a crown portion, a sole portion and a side portion, wherein the crown portion is connected to an upper end of the face portion and is displaced upward as it goes rearward. A first flange portion, a second flange portion connected to a rear end of the first flange portion and displaced downwardly toward the rear, a rear end of the second flange portion, and the face back. A crown rear portion to be connected, the opening is provided from the second flange portion to the crown rear portion, the first flange portion is constituted by a portion of the head main body, and the second flange portion. The flange portion is configured to include a portion in which the head main body portion and the cover member portion are overlapped and joined, and the golf club head is disposed at a predetermined lie angle and loft angle with respect to a horizontal plane. In a reference state installed in the face, a cross section in which the head main body is broken along a plane that includes a normal passing through the center point of the face surface and is orthogonal to the horizontal plane is a face center reference cross section. Then, in the face center reference cross section, the boundary between the upper end of the face portion and the front end of the first flange portion is a first boundary point, and the height of the crown portion from the horizontal plane is maximized. The location of the boundary between the rear end of the first flange portion and the front end of the second flange portion is the maximum height point, and the location of the boundary between the rear end of the second flange portion and the front end of the crown rear portion Is a second boundary point, and in the reference state, in the face center reference cross section, an angle formed by a straight line connecting the first boundary point and the maximum height point from the horizontal plane with respect to the horizontal plane Is the first connection angle α of the first flange portion with respect to the face portion, the first connection angle α is 5 ° or more and 35 ° or less, and in the reference state, in the face center reference cross section The maximum height point and the first When the angle between the straight line connecting the boundary point and the reference vertical plane Pv perpendicular to the face center reference cross section and the horizontal plane is the second connection angle β of the second flange portion to the crown portion, The second connection angle β is not less than 5 ° and not more than 80 °, and the distance along the contour of the first flange portion from the first boundary point to the maximum height point in the face center reference cross section is When the width W of the first flange portion is set, the width W is not less than 5 mm and not more than 25 mm, and the portion of the cover member constituting the second flange portion is located in the foremost position in the face center reference cross section. The part to be performed is located behind the maximum height point.
According to a second aspect of the present invention, in the reference state, in the face center reference cross section, a dimension obtained by projecting the distance from the leading edge of the head main body to the rear end of the head main body on the horizontal plane is defined as a head width Wh. When the front side dimension B is a dimension obtained by projecting the distance from the leading edge to the maximum height point on the horizontal plane as the front side dimension B, the front side dimension B is 15% or more and 50% or less of the head width Wh. In the face center reference cross section, when the distance from the horizontal plane to the maximum height point is a height H, the second boundary point is the height H from the maximum height point toward the horizontal plane. It is in the range of 5% to 50%.
The invention according to claim 3 is characterized in that the surface area Sc of the cover member with respect to the remaining surface area excluding the surface area of the face surface and the surface area of the sole surface from the surface area of the head body is 50% or more and 80% or less. To do.
The invention according to claim 4 is characterized in that the crown portion has a concave shape recessed toward the sole portion side.
According to a fifth aspect of the present invention, a portion of the head main body constituting the second flange portion has a convex shape on the hollow portion side, extends in a toe heel direction, and intersects the face center reference cross section. A rib and a second rib connected to the first rib and extending in a direction orthogonal to the extending direction of the first rib, and the golf club head is moved forward of the face surface in the reference state. When the distance from the heel side located 22.23 mm above the horizontal plane to the end located closest to the toe side is projected onto the horizontal plane as the head length A in the toe heel direction, When the distance of the first rib in the toe heel direction projected onto the horizontal plane is the length L of the first rib, the length L of the first rib is 20% or more of the head length A 100 % Or less And features.
According to a sixth aspect of the present invention, in the face center reference cross section, the second boundary point is positioned rearward of a position where the portion of the head main body constituting the second flange is positioned most rearward. It is characterized by being.
According to a seventh aspect of the present invention, in the face center reference cross section, three measurement points are defined at 1 mm intervals from the center point of the face surface toward the crown portion, and a radius of curvature of an arc passing through the three measurement points is determined. In addition to measuring, the curvature radius is sequentially measured by repeating the operation of measuring the curvature radius while displacing the three measurement points in a direction approaching the crown portion by 1 mm, and the first boundary point is: When a value obtained by dividing the measured radius of curvature by the radius of curvature measured immediately before exceeds two times, it is an intermediate measurement point among the three measurement points, and in the face center reference cross section An arc passing through the three measurement points by defining three measurement points at intervals of 1 mm in the direction away from the face surface along the contour of the crown portion behind the maximum height point The curvature radius is measured by repeating the operation of measuring the curvature radius and displacing the three measurement points while moving the three measurement points by 1 mm along the contour of the crown portion in the direction away from the face surface. Are sequentially measured, and the second boundary point is obtained when the value obtained by dividing the measured radius of curvature by the radius of curvature measured immediately before exceeds two times. It is an intermediate measurement point.

According to the first aspect of the present invention, the first connection angle α, the second connection angle β, and the width W of the first flange portion are defined as described above. The part where the portion of the cover member constituting the part is located in the foremost position is located behind the maximum height point.
Therefore, it is possible to ensure the deformation amount of the first flange portion and the second flange portion while improving the durability of the golf club head by relaxing the stress acting on the joint portion between the head main body and the cover member. Therefore, it is advantageous in improving the restitution coefficient of the face portion and securing the launch angle and improving the flight distance of the hit ball.
According to the second aspect of the present invention, by defining the position in the front-rear direction of the maximum height point and the position in the vertical direction of the second boundary point, the amount of deformation of the first flange portion and the second flange portion. This is more advantageous in securing the amount of deflection of the face portion and more advantageous in improving the flight distance.
According to the third aspect of the invention, securing the surface area of the cover member is more advantageous in securing the amount of deformation of the golf club head, securing the launch angle, and improving the flight distance.
According to the fourth aspect of the present invention, the crown part is formed in a concave shape that is recessed toward the sole part side, so that it is more advantageous in securing the amount of deflection of the face part, securing the launch angle, and improving the flight distance. Become.
According to the fifth aspect of the invention, the strength of the second flange portion can be reinforced by the first rib and the second rib, which is more advantageous in improving the durability of the golf club head.
According to the sixth aspect of the present invention, it is possible to prevent the cover member portion formed of a low-rigidity material and the head main body portion from interfering with each other at the second boundary point portion, thereby improving the durability of the golf club head. This is more advantageous for improvement.
According to the seventh aspect of the invention, it is advantageous to easily and reliably determine the first boundary point K1, the maximum height point Kh, and the second boundary point K2.

1 is a front view of a golf club head according to an embodiment as viewed from the front of a face surface. It is A arrow directional view of FIG. It is a B arrow line 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. It is explanatory drawing of the measuring method of the curvature radius R for prescribing | regulating the 1st boundary point K1. It is explanatory drawing of the measuring method of the curvature radius R for prescribing | regulating the 2nd boundary point K2. The first and second boundary points K1, K2, the maximum height point Kh, the first connection angle α with respect to the face portion of the first flange portion, and the second connection angle β with respect to the crown portion of the second flange portion. It is explanatory drawing. FIG. 5 is a view as viewed in the direction of arrow D in FIG. 4 and is a view of the first rib and the second rib as viewed from the hollow portion side. It is a mimetic diagram showing the deformation state at the time of hitting the golf club head concerning an embodiment. FIG. 14 is a diagram showing a cross-sectional shape of a golf club head of Experimental Example 12. FIG. 40 is a diagram showing a cross-sectional shape of a golf club head of Experimental Example 19; FIG. 38 is a diagram showing a cross-sectional shape of a golf club head of Experimental Example 20; It is a 1st figure which shows the evaluation result of Experimental example 1 to 20. It is a 2nd figure which shows the evaluation result of Experimental example 1 to 20.

Next, embodiments of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 to 4, in the present embodiment, the golf club head 10 is a hollow fairway wood type golf club head and includes a head body 12.
Of course, the present invention can be applied to a hollow structure iron or a hollow structure wood.

The head body 12 is mainly composed of a metal material.
As said metal material, 1 type (s) or 2 or more types, such as stainless steel, maraging steel, pure titanium, a titanium alloy, or an aluminum alloy, are used, for example.
The head body 12 includes a face portion 14, a crown portion 16, a sole portion 18, and a side portion 20.
The face portion 14 has a vertical height and extends to the left and right.
The crown portion 16 extends rearward from the upper portion of the face portion 14.
The sole portion 18 extends rearward from the lower portion of the face portion 14.
The side portion 20 extends between the crown portion 16 and the sole portion 18 through the face back 26 between the toe 22 side edge and the heel 24 side edge of the face portion 14.
The head body 12 has a hollow structure in which the inside surrounded by the face portion 14, the crown portion 16, the sole portion 18, and the side portion 20 is a hollow portion 28.
The surface exposed to the outside of the face portion 14 is a face surface 14A for hitting a ball, and the back surface facing the hollow portion 28 of the face portion 14 is a face back surface 14B.
The surface exposed to the outside of the crown portion 16 is a crown surface 16A.
The crown portion 16 is provided with a hosel 30 connected to the shaft S at a position near the heel 24 on the face surface 14A side.
The surface exposed to the outside of the sole portion 18 is a sole surface 18A, and the back surface facing the hollow portion 28 of the sole portion 18 is a sole back surface 18B.

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.

[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.
5 to 8 are explanatory views showing a method for defining the center point Pc of the face surface 14A.

(1) First, as shown in FIG. 5, 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 the direction connecting the crown portion 16 and the sole portion 18 is obtained.
That is, as shown in FIG. 5, a perpendicular line f <b> 0 that intersects with the approximate center point of a line parallel to the horizontal plane HP connecting the toe 22 and the heel 24 (hereinafter referred to as a horizontal line) is drawn.
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, a horizontal line g0 passing through the temporary center point c0 is drawn as shown in FIG.
(4) Next, as shown in FIG. 7, the d0 point where the horizontal line g0 and the edge on the toe 22 side of the face surface 14A intersect, and the e0 point where the horizontal line g0 and the edge on the heel 24 side of the face surface 14A intersect. The midpoint is defined as a temporary center point c1.

(5) Next, as shown in FIG. 8, 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, 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 orthogonal to the toe 22-heel 24 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. 9, 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, in other words. 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. 10, a large number of planes H1, H2, H3,..., Hn including a straight line Lp connecting the center of gravity G0 and the on-face center of gravity FG are considered.

In a cross section when the golf club head 10 is broken along 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. 11).
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. 12, the golf club head 10 is placed on the horizontal ground (horizontal plane HP) so that the lie angle and the face angle become the prescribed values.
The straight line LT passes through the toe 22 side point PT of the face surface 14A and extends in the vertical direction.
The straight line LH passes through the heel 24 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, the definition of each part of the golf club head 10 will be described in detail.
As shown in FIGS. 1 to 4, 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 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.

As shown in FIGS. 3 and 4, the crown portion 16 has an opening 32, and the opening 32 is provided from a second flange portion 38 to be described later to the crown rear portion 17.
The crown portion 16 has a cover member 34 that covers the opening 32 by being joined to the outer periphery of the opening 32.
The cover member 34 is formed of a low-rigidity material that has lower rigidity than the head 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.

As shown in FIGS. 3 and 4, the crown portion 16 includes a first flange portion 36, a second flange portion 38, and a crown rear portion 17.
The first flange portion 36 is connected to the upper end of the face portion 14, is displaced upward as it goes rearward, extends along the toe heel direction, and is configured by the head body 12.
The second flange portion 38 is connected to the rear end of the first flange portion 36 and is displaced downward and extends along the toe heel direction toward the rear. The second main body portion 12 and the cover member 34 portion. And a portion that is overlapped and joined.
The crown rear portion 17 connects the rear end of the second flange portion 38 and the face back 26.

More specifically, as shown in FIG. 4, the head main body side mounting surface 1202 and the head main body side standing surface are formed on the portion of the head main body 12 located on the outer periphery of the opening 32 of the second flange portion 38. 1204 is formed.
The head main body side mounting surface 1202 extends along the contour of the opening 32 at a location displaced closer to the hollow portion 28 than the surface of the second flange portion 38.
The head main body side standing surface 1204 is erected from the outer periphery of the head main body side mounting surface 1202.
A cover member side mounting surface 3402 and a cover member side standing surface 3404 are formed in a portion of the cover member 34 located on the outer periphery of the opening 32 in the second flange portion 38.
The cover member side placement surface 3402 is a place on the head main body side placement surface 1202, and extends along the contour of the opening 32.
The cover member side standing surface 3404 is raised from the outer periphery of the cover member side mounting surface 3402.
The cover member 34 is bonded to the head main body 12 with the cover member side mounting surface 3402 overlapped with the head main body side mounting surface 1202 and the cover member side rising surface 3404 is overlapped with the head main body side rising surface 1204. Has been.
The cover member 34 and the head body 12 are joined together by an adhesive.

Next, the first flange portion 36 and the second flange portion 38 will be described in detail.
As shown in FIGS. 3 and 4, in the reference state of the golf club head 10, the first center point K <b> 1, the maximum height point Kh, and the second height point in the face center reference section Pfc based on the procedure described below. A boundary point K2 is defined.
The first boundary point K1 is the boundary between the upper end of the face portion 14 and the front end of the first flange portion 36 in the face center reference cross section Pfc.
The maximum height point Kh is a boundary between the rear end of the first flange portion 36 and the front end of the second flange portion 38 where the height of the crown portion 16 from the horizontal plane HP is maximum.
The second boundary point K <b> 2 is a boundary point between the rear end of the second flange portion 38 and the front end of the crown rear portion 17.
Hereinafter, specific rules for the first boundary point K1, the maximum height point Kh, and the second boundary point K2 will be described.

(First boundary point K1)
As shown in FIGS. 4 and 13, in the face center reference section Pfc, three measurement points p are defined at intervals of 1 mm from the center point Pfc of the face surface 14 </ b> A toward the crown portion 16, and arcs passing through the three measurement points p. The radius of curvature (R = R1, R2, R3) is measured by repeating the operation of measuring the radius of curvature R and displacing the three measurement points p in the direction approaching the crown portion 16 by 1 mm. ,..., Rn-1, Rn, Rn + 1,.
When the value obtained by dividing the measured radius of curvature Rn by the radius of curvature Rn-1 measured immediately before exceeds two times, the intermediate measurement point p among the three measurement points p is defined as the first boundary point. Let K1.

(Maximum height point Kh)
As shown in FIG. 4, in the face center reference cross section Pfc, a point at which the height of the crown portion 16 from the horizontal plane HP is the maximum is defined as a maximum height point Kh.

(Second boundary point K2)
As shown in FIGS. 4 and 14, in the face center reference cross section Pfc, three measurement points p are spaced at 1 mm intervals in the direction away from the face surface 14A along the contour of the crown portion 16 behind the maximum height point Kh. Is measured, and the radius of curvature R of the arc passing through the three measurement points p is measured, and the measurement of the curvature radius R is performed in the direction away from the face surface 14A along the contour of the crown portion 16 by measuring the three measurement points p by 1 mm. The radius of curvature (R = R1, R2, R3,... Rn−1, Rn, Rn + 1,...) Is sequentially measured by repeating the operation performed while displacing toward the surface.
When the value obtained by dividing the measured radius of curvature Rn by the radius of curvature Rn-1 measured immediately before exceeds twice, the intermediate measurement point p among the three measurement points p is set as the second boundary point. Let K2.

(First connection angle α)
As shown in FIG. 15, in the reference state of the golf club head 10, a straight line L1 connecting the first boundary point K1 and the maximum height point Kh from the horizontal plane HP in the face center reference section Pfc is a horizontal plane HP ( HP ′) is defined as a first connection angle α with respect to the face portion 14 of the first flange portion 36.
In the drawing, symbol HP ′ indicates a horizontal plane parallel to the horizontal plane HP.

(Second connection angle β)
As shown in FIG. 15, in the reference state of the golf club head 10, in the face center reference section Pfc, the straight line L2 connecting the maximum height point Kh and the second boundary point K2 is the face center reference section Pfc and the horizontal plane HP. The second connection angle β of the second flange portion 38 with respect to the crown portion 16 is defined as an angle formed with the reference vertical plane Pv orthogonal to the second flange portion 38.

(Width W of the first flange part)
As shown in FIG. 15, in the face center reference cross section Pfc, the distance along the contour of the first flange portion 36 from the first boundary point K1 to the maximum height point Kh is the width W of the first flange portion 36. And

In the present embodiment, the first connection angle α of the first flange portion 36 with respect to the face portion 14 is set to 5 ° to 35 °.
When the first connection angle α is in the range of 5 ° or more and 35 ° or less, a large amount of deformation of the first flange portion 36 can be ensured at the time of hitting the ball, and accordingly, the amount of deflection of the face portion 14 increases. Since the coefficient can be increased and the launch angle can be increased, this is advantageous in improving the flight distance.
If the first connection angle α is less than the range of 5 ° or more and 35 ° or less, it is disadvantageous in securing the deformation amount of the first flange portion 36 at the time of hitting, and therefore the amount of deflection of the face portion 14 is reduced. In addition, the coefficient of restitution is reduced and the launch angle is reduced, which is disadvantageous in improving the flight distance.
When the first connection angle α exceeds the range of 5 ° or more and 35 ° or less, the deformation amount of the first flange portion 36 can be ensured at the time of hitting, and accordingly, the amount of deflection of the face portion 14 increases, and the amount of deflection is large. Since it is too large, the coefficient of restitution becomes too high, the launch angle becomes too large, and the sweet area becomes narrow, which is disadvantageous for improving the average flight distance. In addition, the golf club head 10 has an uncomfortable feeling with respect to the external shape, which is disadvantageous in that it is difficult to hold and swing.

In the present embodiment, the second connection angle β of the second flange portion 38 with respect to the crown portion 16 is set to 5 ° or more and 80 ° or less.
When the second connection angle β is in the range of 5 ° to 80 °, the deformation of the first flange portion 36 and the second flange portion 38 at the time of hitting is promoted.
Therefore, the amount of deflection of the face portion 14 can be ensured, and in particular, the effect of ensuring backward tilting of the face portion 14 (deformation of the face portion 14 in the direction in which the loft angle increases) becomes remarkable.
Therefore, the coefficient of restitution can be increased to increase the initial velocity of the ball, and the effect of securing the launch angle can be achieved, which is advantageous in improving the flight distance.

Further, when the second connection angle β is less than the range of 5 ° or more and 80 ° or less, the location of the maximum height point Kh that is the location of the boundary between the first flange portion 36 and the second flange portion 38 is an acute angle. Therefore, when the ball is hit, the stress is likely to act locally at the maximum height point Kh, which is disadvantageous in improving the durability of the golf club head 10.
When the second connection angle β exceeds the range of 5 ° or more and 80 ° or less, deformation of the first flange portion 36 and the second flange portion 38 during hitting is suppressed.
Accordingly, the amount of deflection of the face portion 14 is reduced, and the backward tilting of the face portion 14 (deformation of the face portion 14 in the direction in which the loft angle increases) is reduced.
Therefore, it is disadvantageous in increasing the initial speed of the ball and securing the launch angle, and disadvantageous in improving the flight distance.
In addition, when the second connection angle β is less than the range of 5 ° or more and 80 ° or less, a large force is applied to the boundary (maximum height point Kh) between the first flange portion 36 and the second flange portion 38. Since it becomes easy to join, it is disadvantageous in improving the durability of the golf club head 10.

Moreover, in this Embodiment, the width W of the 1st flange part 36 was 5 mm or more and 25 mm or less.
When the width W of the first flange portion 36 is in the range of 5 mm or more and 25 mm or less, it is advantageous for securing the amount of deformation of the first flange portion 36 during hitting and securing the amount of deflection of the face portion 14. This is advantageous in improving the flight distance.
When the width W of the first flange portion 36 is less than the range of 5 mm or more and 25 mm or less, the load locally applied to the first flange portion 36 at the time of hitting the ball becomes excessive, and the durability of the golf club head 10 is ensured. It is disadvantageous to do.
If the width W of the first flange portion 36 exceeds the range of 5 mm or more and 25 mm or less, the deformation amount of the first flange portion 36 at the time of hitting the ball is small, which is disadvantageous in securing the amount of deflection of the face portion 14, and the flight distance. It is disadvantageous to improve In addition, the golf club head 10 has an uncomfortable feeling with respect to the external shape, which is disadvantageous in that it is difficult to hold and swing.

Further, in the present embodiment, as shown in FIG. 4, in the face center reference cross section Pfc, the portion of the cover member 34 that constitutes the second flange portion 36 is located at the forefront (front end of the cover member 34). Is located behind the maximum height point Kh.
That is, the joint portion between the head main body 12 and the cover member 34 (joint portion between the head main body side standing surface 1204 and the cover member side standing surface 3404) is located behind the maximum height point Kh.
Therefore, since the joint portion between the head main body 12 and the cover member 34 is separated rearward from the portion of the maximum height point Kh at which the stress is likely to act locally at the time of hitting the ball, the stress acting on the joint portion can be relieved. This is advantageous in improving the durability of the golf club head 10.
On the other hand, in the face center reference cross section Pfc, when the portion of the cover member 34 constituting the second flange portion 36 is located at the foremost position at the same position as the maximum height point Kh, the head body 12 Stress is likely to act locally on the joint between the cover member 34 and the cover member 34, which is disadvantageous in improving the durability of the golf club head 10.

As shown in FIG. 4, in the reference state of the golf club head 10, a dimension obtained by projecting the distance from the leading edge N3 of the head body 12 to the rear end N4 of the head body 12 on the horizontal plane HP in the face center reference section Pfc. The length A is a dimension obtained by projecting the distance from the leading edge N3 to the maximum height point Kh on the horizontal plane HP, and the front dimension B.
In the present embodiment, the front dimension B is in the range of 15% to 50% of the head width Wh.
When the front dimension B is in the range of 15% or more and 50% or less of the head width Wh, it is advantageous for securing the amount of deformation of the first flange portion 36 at the time of hitting and securing the deflection amount of the face portion 14. This is advantageous in improving the flight distance.
When the front dimension B is less than 15% or more and 50% or less of the head width Wh, the load applied locally to the first flange portion 36 at the time of hitting the ball becomes large, and the durability of the golf club head 10 is ensured. The effect is reduced.
Further, if the front dimension B is less than 15% to 50% of the head width Wh, the width W of the first flange portion 36 is narrow although it is within the range of 5 mm to 25 mm. The deformation amount (deflection amount) of the flange portion 36 is easily suppressed, the effect of ensuring resilience is reduced, and the effect of improving the initial speed (flying distance) is reduced.
When the front dimension B is less than 15% to 50% of the head width Wh, the maximum height point Kh approaches the face surface 14A. Therefore, when the golf club is held, the face surface 14A is visually observed. It is easy to feel the orientation of the golf club in the target direction, and the effect of securing the ease of holding the golf club is reduced.
When the front dimension B exceeds the range of 15% or more and 50% or less of the head width Wh, the deformation amount of the first flange portion 36 at the time of hitting the ball is small, and the effect of securing the deflection amount of the face portion 14 is reduced, and the flight distance is reduced. The effect of improving the efficiency is reduced.

As shown in FIG. 4, in the reference state of the golf club head 10, the distance from the horizontal plane HP to the maximum height point Kh in the face center reference cross section Pfc is the height H.
In the present embodiment, the second boundary point K2 is set in the range of 5% to 50% of the height H from the maximum height point Kh toward the horizontal plane HP.
When the second boundary point K2 is within the range of 5% to 50% of the height H from the maximum height point Kh toward the horizontal plane HP, the amount of deformation of the second flange portion 38 at the time of hitting the ball is secured. This is advantageous in securing the amount of deflection of the face portion 14, and is advantageous in improving the flight distance.
When the second boundary point K2 falls below a range of 5% or more and 50% or less of the height H from the maximum height point Kh toward the horizontal plane HP, an effect of securing the deformation amount of the second flange portion 38 at the time of hitting the ball. Decreases, the effect of securing the amount of deflection of the face portion 14 decreases, and the effect of improving the flight distance decreases.
Further, the load locally applied to the second flange portion 38 at the time of hitting the ball becomes large, and the effect of ensuring the durability of the golf club head 10 is reduced.
When the second boundary point K2 exceeds the range of 5% or more and 50% or less of the height H from the maximum height point Kh toward the horizontal plane HP, the tendency to feel uncomfortable with the appearance shape of the golf club head 10 increases. .

In the present embodiment, the surface area Sc of the cover member 34 with respect to the remaining surface area ΔS = Sh− (Sf + Ss) obtained by removing the surface area Sf of the face surface 14A and the surface area Ss of the sole surface 18A from the surface area Sh of the head body 12 is 50. % To 80%.
When the surface area Sc of the cover member 34 with respect to the surface area ΔS is in the range of 50% or more and 80% or less, the golf club body is made golf at the time of hitting by the action of the cover member 34 formed of a low rigidity material having lower rigidity than the golf club body 12. This is advantageous in securing the amount of deformation of the club head 10 and securing the amount of deflection of the face portion 14, and is advantageous in securing the launch angle and improving the flight distance.
When the surface area Sc of the cover member 34 with respect to the surface area ΔS falls below the range of 50% or more and 80% or less, the surface area of the cover member 34 is small, so that the deformation amount of the golf club head 10 is ensured at the time of hitting and the face portion 14 is bent. The effect of securing the amount is reduced, and the effect of securing the launch angle and improving the flight distance is reduced.
If the surface area Sc of the cover member 34 with respect to the surface area ΔS exceeds the range of 50% or more and 80% or less, the surface area of the cover member 34 is large, so that the deformation amount of the golf club head 10 at the time of hitting is large and the deflection amount of the face portion 14 is large. The effect of ensuring the durability of the golf club head 10 is reduced.

In the present embodiment, as shown in FIG. 4, the crown portion 16 has a concave shape that is recessed toward the sole portion 18.
When the crown portion 16 has a concave shape that is recessed toward the sole portion 18, the deformation amount of the first flange portion 36 and the second flange portion 38 at the time of hitting the ball increases, and the amount of deflection of the face portion 14 is ensured. This is advantageous for securing the launch angle and improving the flight distance.
As shown in FIG. 18, if the crown portion 16 does not exhibit a concave shape that is recessed toward the sole portion 18, the amount of deformation of the first flange portion 36 and the second flange portion 38 at the time of hitting the ball becomes small, and the face The effect of securing the deflection amount of the portion 14 is reduced, and the effect of securing the launch angle and improving the flight distance is reduced.

In the present embodiment, as shown in FIGS. 4 and 16, the first rib 40 and the second rib 42 are provided in the portion of the head main body 12 constituting the second flange portion 38. . In order to simplify the drawing, the shapes of the first rib 40 and the second rib 42 are simplified in FIG.
The first rib 40 has a convex shape on the hollow portion 28 side, extends in the toe heel direction, and intersects the face center reference cross section Pfc.
Two first ribs 40 are provided at intervals in the front-rear direction.
The second rib 42 has a convex shape on the hollow portion 28 side, is connected to the first rib 40, and extends in a direction orthogonal to the extending direction of the first rib 40.
Four second ribs 42 are provided at intervals in the extending direction of the first ribs 40, and the four second ribs 42 have a symmetrical positional relationship with respect to the face center reference cross section Pfc. 42 is arranged.
In this case, as shown in FIG. 1, when the golf club head is viewed from the front of the face surface 14A in the reference state, the end located on the most toe side from the heel side position located 22.23 mm above the horizontal plane HP. The head length A in the toe heel direction is a dimension obtained by projecting the distance to the portion onto the horizontal plane HP.
As shown in FIG. 16, a dimension obtained by projecting the distance in the toe heel direction of the first rib 40 onto the horizontal plane HP is defined as a length Lr of the first rib.
In the present embodiment, the length Lr of the first rib 40 is 20% or more and 100% or less of the head length A.
When the first rib 40 and the second rib 42 defined as described above are provided, the strength of the second flange portion 38 can be reinforced, and the resilience of the face portion 14 is increased (initial velocity is increased). This is advantageous in improving the durability of the golf club head 10.
If the first rib 40 and the second rib 42 are not provided, the effect of reinforcing the strength of the second flange portion 38 is reduced, the effect of increasing the resilience of the face portion 14 and the durability of the golf club head 10. The effect of improving the property is reduced.
One or more first ribs 40 and second ribs 42 may be provided.

In the present embodiment, as shown in FIG. 4, in the face center reference section Pfc, the second boundary point K2 is a position where the portion of the head main body 12 constituting the second flange 38 is located at the rearmost position. It is located behind.
That is, the portion of the head main body 12 that constitutes the second flange 38 is an edge portion 1210 that defines the outer periphery of the opening 32 of the head main body 12, and the second boundary point K 2 is located behind the edge portion 1210. positioned.
Therefore, since the second boundary point K2 of the cover member 34 and the edge 1210 of the head main body 12 are separated from each other, even if the second flange portion 38 is deformed at the time of hitting, it is formed of a low rigidity material. Interference between the second boundary point K2 of the cover member 34 and the edge 1210 of the head body 12 can be suppressed. That is, since it is possible to suppress interference between the portion of the cover member 34 formed of a low-rigid material and the portion of the head main body 12 at the portion of the second boundary point K2, the durability of the golf club head 10 can be improved. It is advantageous in planning.
On the other hand, in the face center reference cross section Pfc, when the second boundary point K2 is at the same position as the position where the portion of the head main body 12 constituting the second flange 38 is located at the rearmost position, the cover member 34 is provided. The second boundary point K2 and the location where the head main body 12 is located most rearward are likely to interfere with each other, and the effect of improving the durability of the golf club head 10 is reduced.

As described above, according to the golf club head 10 of the present embodiment, the first connection angle α of the first flange portion 36 with respect to the face portion 14 is set to 5 ° to 35 °, and the second flange portion 38. The second connection angle β with respect to the crown portion 16 is set to 5 ° or more and 80 ° or less, the width W of the first flange portion 36 is set to 5 mm or more and 25 mm or less, and the second flange portion 38 is formed in the face center reference cross section Pfc. The place where the portion of the cover member 34 to be configured is located in the foremost position is located behind the maximum height point Kh.
Therefore, it is advantageous in improving the durability of the golf club head 10 by reducing the stress acting on the joint portion between the head body 12 and the cover member 34.
Further, since the shapes of the first flange portion 36 and the second flange portion 38 are defined so that the deformation amount of the first flange portion 36 and the second flange portion 38 can be secured at the time of hitting the ball, the repulsion of the face portion 14 is achieved. It is advantageous in improving the coefficient and launch angle, and improving the flight distance of the hit ball.
FIG. 17 is a schematic diagram showing a deformed state of the golf club head according to the embodiment at the time of hitting, a solid line showing a state before hitting, and a two-dot chain line showing a state after hitting.
When the ball is hit by the face portion 14, the first flange portion 36, the second flange portion 38, and the cover member 34 are deformed, so that the deflection amount of the face portion 14 is ensured and the loft angle is increased. The face portion 14 is tilted backward so as to increase.

Hereinafter, experimental examples of the present invention will be described.
21 and 22 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) Initial Speed A golf club equipped with the golf club head 10 was installed in a swing robot, and an actual hit test was performed under the following conditions, and the average value of the initial speed at 9 points 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.
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.
On the face center line CL, a point 5 mm away from the center point Pc in the direction of the crown portion 16, 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.
A point 5 mm away from the center point Pc in the direction of the sole 18 on the face center line CL, a point 5 mm away from the above point in the toe direction on a 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) Launch angle Based on the launch angle obtained in the actual launch test at the above-mentioned launch position, the index of Experimental Example 1 is set to 100, and the larger the index, the greater the launch angle and the better the evaluation.

(3) Durability A golf ball is repeatedly applied with an air cannon to the face surface 14A of the golf club head 10 fixed to the shaft, and the number of hits required until the face part 14 is deformed or damaged is measured. Was indexed. The ball speed was 50 m / s.
In this case, the measurement result of the golf club head 10 of Experimental Example 1 is shown as an index with 100 as the measurement result. The larger the index, the better the evaluation.

(4) Ease of holding The ease of holding when actually holding the golf club head 10 was evaluated by an index. The index of the conventional example is set to 100, and the larger the index, the easier it is to hold.

(5) Total score The total score was obtained by summing up the above four indices of initial speed, launch angle, durability, and ease of holding.
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 20 will be described with reference to FIGS.
Experimental example 1 is a conventional technique and corresponds to a comparative example, and does not satisfy the definition of claim 1 of the present invention.
That is, in Experimental Example 1, a cover member 34 formed of a low-rigidity material having lower rigidity than the head main body 12 is joined to the opening 32 formed in the crown portion 16.
Further, it has a portion corresponding to the first flange portion 36, but does not have a portion corresponding to the second flange portion 38.
In addition, ribs corresponding to the first and second ribs 40 and 42 are formed at positions near the cover member 34 in a portion corresponding to the first flange portion 36. At this time, two ribs corresponding to the first rib 40 and two ribs corresponding to the second rib 42 are provided.

Experimental Examples 2, 3, 4, 19, and 20 are within the scope of the present invention and satisfy all of the provisions of claims 1 to 6.
Experimental Examples 9 to 15 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 to 6.
Experimental Examples 5 to 8 are outside the scope of the present invention and do not satisfy the definition of claim 1.

Experimental example 2 is within the scope of the present invention and satisfies all of the provisions of claims 1 to 6.
Therefore, the initial speed 130, the launch angle 130, the durability 130, the ease of holding 100, and the total score 490 are the same as those of Experimental Example 1, and the remaining evaluation is superior to Experimental Example 1. .

Experimental Example 3 is within the scope of the present invention, and the front dimension B / head width Wh is 15%, which is the lower limit of the range of 15% to 50% of claim 2.
Therefore, the initial speed 125, the launch angle 123, the durability 122, the ease of holding 100, and the total score 470 are the same as those of Experimental Example 1, and the remaining evaluation is superior to that of Experimental Example 1. .

Experimental Example 4 is within the scope of the present invention, and the second connection angle β is 6 °, which is a value in the vicinity of the lower limit value in the range of 5 ° to 80 ° of claim 1.
Therefore, the initial speed 119, the launch angle 121, the durability 118, the ease of holding 100, and the total score 458 are the same as those of Experimental Example 1, and the remaining evaluation is superior to that of Experimental Example 1. .

Experimental example 5 is outside the scope of the present invention, and the first connection angle α is 3 °, which is less than the range of 5 ° to 35 ° of claim 1.
Therefore, since it is disadvantageous in securing the deflection amount of the first flange portion 36, the initial speed 94, launch angle 110, durability 104, ease of holding 100, and the total point 408, the launch angle is improved. However, other evaluations are equivalent to those of Experimental Example 1.

Experimental Example 6 is outside the scope of the present invention, and the width W of the first flange portion 36 is 27 mm, which exceeds the range of 5 mm to 25 mm in claim 1.
Therefore, it is disadvantageous in securing the amount of deflection of the first flange portion 36, and there is a sense of incongruity in the shape. Therefore, the initial speed 92, launch angle 113, durability 110, ease of holding 94, and the total point 409 are obtained. Although the launch angle is improved, the other evaluations are the same as in Experimental Example 1.

Experimental example 7 is outside the scope of the present invention, and the second connection angle β is 85 °, which exceeds the range of 5 ° to 80 ° of claim 1.
Therefore, since it is disadvantageous in securing the deflection amount of the second flange portion 38, the initial speed 98, launch angle 113, durability 98, ease of holding 100, and the total point 409, the launch angle is improved. However, other evaluations are equivalent to those of Experimental Example 1.

Experimental Example 8 is outside the scope of the present invention, and the rear end of the cover member is not positioned behind the maximum height point Kh, and the rear end of the cover member coincides with the maximum height point Kh.
Therefore, since stress is likely to act locally on the joint portion between the head main body 12 and the cover member 34, the initial speed 107, the launch angle 114, the durability 88, the ease of holding 100, and the total point 409, Although the initial speed and launch angle are improved, the durability is greatly reduced as compared with Experimental Example 1.

Experimental Example 9 is within the scope of the present invention, but the front dimension B / head width Wh indicating the position in the front-rear direction of the maximum height point Kh is 10%, and 15% to 50% of claim 2 Below range.
Therefore, since the effect of ensuring the durability and the initial speed is reduced, the initial speed 110, the launch angle 115, the durability 100, the ease of holding 95, and the total point 420, the initial speed, compared to the experimental example 2, The effects of launch angle, durability, and ease of use are reduced.

Experimental example 10 is within the scope of the present invention, but the position of the second boundary point K2 from the maximum height point Kh is 55% of the height H of the maximum height position Kh. % Over the range of 50% to 50%.
Therefore, the effect of ensuring the durability of the golf club head 10 is reduced, and the effect of suppressing the uncomfortable feeling with respect to the external shape of the golf club head 10 is reduced.
Therefore, the initial speed 111, the launch angle 114, the durability 100, the ease of holding 100, and the total score 425 are obtained, and the effects of durability and ease of holding are reduced as compared with Experimental Example 2.

In Experimental Example 11, the ratio of the surface area Sc of the cover member to the surface area ΔS obtained by subtracting the surface area of the face surface and the sole surface from the surface area of the head body is 40% within the scope of the present invention. % And below 80%.
Therefore, since the surface area of the cover member 34 is small, the effect of ensuring the amount of deformation of the golf club head 10 and the amount of deflection of the face portion 14 is reduced.
Therefore, the initial speed 112, the launch angle 107, the durability 110, the ease of holding 100, and the total point 429 are obtained, and the effects of the initial speed and the launch angle are reduced as compared with Experimental Example 2.

Although Experimental Example 12 is within the scope of the present invention, as shown in FIG. 18, the crown portion 16 does not have a concave shape, and thus does not satisfy the definition of claim 4.
Therefore, the deformation amount of the first flange portion 36 and the second flange portion 38 at the time of hitting the ball becomes small.
Therefore, the initial speed 110, the launch angle 117, the durability 110, the ease of holding 100, and the total score 437 are obtained, and the effects of the initial speed and the launch angle are reduced as compared with Experimental Example 2.

Experimental Example 13 is within the scope of the present invention, but the first rib 40 is not formed and does not satisfy the definition of claim 5.
Therefore, the effect of reinforcing the strength of the second flange portion 38 is reduced.
Therefore, the initial speed 118, the launch angle 120, the durability 113, the ease of holding 100, and the total point 451 are obtained, and the effects of the initial speed, the launch angle, and the durability are reduced as compared with Experimental Example 2.

Experimental Example 14 is within the scope of the present invention, but the second rib 42 is not formed and does not satisfy the definition of claim 5.
Therefore, the effect of reinforcing the strength of the second flange portion 38 is reduced.
Therefore, the initial speed 117, the launch angle 116, the durability 115, the ease of holding 100, and the total score 448 are obtained, and the effects of the initial speed, the launch angle, and the durability are reduced as compared with Experimental Example 2.

Experimental Example 15 is within the scope of the present invention, but in the face center reference cross section Pfc, the second boundary point K2 is a position where the portion of the head body 12 constituting the second flange 38 is located at the rearmost position. They are in the same position and do not meet the provisions of claim 6.
Therefore, the second boundary point K2 of the cover member 34 and the portion where the head main body 12 is located most rearward are likely to interfere with each other.
Therefore, the initial speed 117, the launch angle 119, the durability 117, the ease of holding 100, and the total point 453 are obtained, and the durability effect is reduced as compared with Experimental Example 2.

Experimental example 16 is outside the scope of the present invention, and the first connection angle α is 40 °, which exceeds the range of 5 ° to 35 ° of claim 1.
Therefore, since the deflection amount is too large, the launch angle becomes too large, and the sweet area becomes narrow, which is disadvantageous in improving the average flight distance. In addition, a sense of incongruity with respect to the external shape of the golf club head 10 is likely to occur.
Therefore, the initial speed 110, the launch angle 105, the durability 100, the ease of holding 93, and the total score 408 are obtained, and the initial speed and the launch angle are improved, but the evaluation of ease of holding is lower than that of Experimental Example 1. .

Experimental Example 17 is outside the scope of the present invention, and the width W of the first flange portion 36 is 3 mm, which is less than the range of 5 mm to 25 mm of claim 1.
Therefore, it is disadvantageous in securing the amount of deflection of the face portion 14, and the initial speed 93, the launch angle 111, the durability 106, the ease of holding 100, and the total point 410 are obtained, and the launch angle is improved. Evaluation is low compared with Experimental Example 1.

Experimental example 18 is outside the scope of the present invention, and the second connection angle β is 3 °, which is less than the range of 5 ° to 80 ° of claim 1.
Accordingly, stress is likely to act locally at the position of the maximum height point Kh at the time of hitting, which is disadvantageous for improving the durability of the golf club head 10, and the initial speed 98, launch angle 109, durability 101, and easy to hold. 100, a total score of 408, and the launch angle is improved, but the other evaluations are the same as in Experimental Example 1.

Experimental Example 19 is within the scope of the present invention, but the front dimension B / head width Wh indicating the position in the front-rear direction of the maximum height point Kh is 58%, which is 15% to 50% of claim 2. Exceeding range.
Therefore, since the effect of securing the amount of deflection of the face portion 14 is reduced, the initial speed 99, launch angle 112, durability 113, ease of holding 100, total point 424, compared to the experimental example 2, The effect of initial speed and launch angle is reduced.

Experimental example 20 is within the scope of the present invention, but the position of the second boundary point K2 from the maximum height point Kh is 3% of the height H of the maximum height position Kh. % Is below the range of 50% or less.
Accordingly, since the effect of securing the deformation amount of the second flange portion 38 is reduced, the initial speed 105, the launch angle 117, the durability 101, the ease of holding 100, and the total point 423 are obtained, which is compared with the experimental example 2. As a result, the effects of initial speed and launch angle are reduced.

Experimental example 21 is within the scope of the present invention, and satisfies all the provisions of claims 1 to 6.
In Experimental Example 21, as shown in FIG. 19, the shape of the head body 12 is a driver type.
Experimental example 21 has initial speed 128, launch angle 128, durability 130, ease of holding 101, and total score 487. Ease of setting is equivalent to experimental example 1, and the remaining evaluation is higher than experimental example 1. Are better.

Experimental example 22 is within the scope of the present invention, and satisfies all the provisions of claims 1 to 6.
In Experimental Example 22, as shown in FIG. 20, the shape of the head main body 12 is a utility type.
Experimental example 22 has initial speed 129, launch angle 128, durability 130, ease of holding 100, and total score 487. Ease of setting is equivalent to experimental example 1, and the remaining evaluation is higher than experimental example 1. Are better.

Each evaluation item is examined below.
(1) Initial speed In Experimental Examples 2, 3, 4, 21, and 22 that satisfy all the definitions of claims 1 to 6 within the scope of the present invention, the initial speed is 119 to 130, and the initial speed is the best.
Within the scope of the present invention, Examples 9 to 15, 19, and 20 that satisfy the definition of claim 1 but do not satisfy any of the definitions of claims 2 to 6 have an initial speed of 99 to 118, and the initial speed is the next best.
In Experimental Examples 5 to 8 and 16 to 18 which are outside the scope of the present invention and do not satisfy the provisions of Claim 1, the initial speed is 93 to 106, and the evaluation of the initial speed is equivalent to that of Experimental Example 1.
Therefore, those satisfying all the provisions of claims 1 to 6 within the scope of the present invention are excellent in the effect of improving the initial speed over those outside the scope of the present invention.

(2) Launch angle Experimental Examples 2, 3, 4, 21, and 22 that satisfy all the definitions of claims 1 to 6 within the scope of the present invention have launch angles of 121 to 130, and the launch angle is the best. ing.
In Examples 9 to 15, 19, and 20, which are within the scope of the present invention and satisfy the provision of claim 1 but do not satisfy any of the provisions of claims 2 to 6, the launch angle is 107. ˜120, and the launch angle is the next best.
Examples 5 to 8 and 16 to 18 that are outside the scope of the present invention and do not satisfy the provisions of claim 1 have launch angles of 105 to 114, and the launch angle is higher than that of Experimental Example 1, Low compared to experimental examples within the scope of the invention.
Therefore, those satisfying all of the definitions of claims 1 to 6 within the scope of the present invention have an excellent effect of improving the launch angle with respect to those outside the scope of the present invention.

(3) Durability Within the scope of the present invention, Experimental Examples 2, 3, 4, 21, and 22 satisfying all the provisions of claims 1 to 6 have a durability of 118 to 130 and the highest durability. ing.
Within the scope of the present invention, the experimental examples 9 to 15, 19, and 20 that satisfy the definition of claim 1 but do not satisfy any of the definitions of claims 2 to 6 have durability of 100. It is -117, and durability is next excellent.
The experimental examples 5 to 8 and 16 to 18 which are outside the scope of the present invention and do not satisfy the provisions of claim 1 have a durability of 88 to 110 and are lower than the experimental example 1 except for a part.
Therefore, those satisfying all of the definitions of claims 1 to 6 within the scope of the present invention have an excellent effect of improving the durability over those outside the scope of the present invention.

(4) Ease of setting In Examples 2, 3, 4, 21, and 22, which are within the scope of the present invention and satisfy all the provisions of claims 1 to 6, the ease of setting is 100 and 101, and the ease of setting is improved. Is equivalent to Experimental Example 1.
Within the scope of the present invention, Examples 9 to 15, 19, and 20 that satisfy the provision of claim 1 but do not satisfy any of the provisions of claims 2 to 6 are easy to hold. It is 95-100 and is easy to prepare, which is equivalent to Experimental Example 1.
The experimental examples 5 to 8 and 16 to 18 that are outside the scope of the present invention and do not satisfy the provisions of claim 1 are 93 to 100 and are equal to or less than the experimental example 1.
Therefore, those satisfying all of the provisions of claims 1 to 6 within the scope of the present invention are advantageous in securing ease of setting against those outside the scope of the present invention.
(5) Total score In Experimental Examples 2, 3, 4, 21, and 22, which are within the scope of the present invention and satisfy all the provisions of claims 1 to 6, the total score is 458 to 490, and the total score is the best. ing.
Within the scope of the present invention, Experimental Examples 9 to 15, 19, and 20 that satisfy the provision of claim 1 but do not satisfy any of the provisions of claims 2 to 6 have a total score of 420. It is ˜453 and the total score is the next best.
Examples 5 to 8 and 16 to 18 which are outside the scope of the present invention and do not satisfy the provisions of claim 1 have a total score of 408 to 410, which is higher than Example 1 and within the scope of the present invention. Low compared to experimental examples.
Therefore, those satisfying all of the definitions of claims 1 to 6 within the scope of the present invention are excellent in the effect of improving the total score over those outside the scope of the present invention.

DESCRIPTION OF SYMBOLS 10 Golf club 12 Head main body 14 Face part 14A Face surface 16 Crown part 16A Crown surface 17 Crown rear part 18 Sole part 18A Sole surface 20 Side part 22 Toe 24 Heel 26 Face back 28 Hollow part 32 Opening part 34 Cover member 36 1st Flange portion 38 Second flange portion 40 First rib 42 Second rib HP Horizontal plane Pc Center point Pfc of face surface 14A Face center reference section CL Face center line X plane K1 First boundary point K2 Second boundary point Kh Maximum height point p Measurement point R Curvature radius A Head length Wh Head width L First rib length W First flange width

Claims (7)

A face portion having a vertical height and extending left and right; a crown portion extending rearward from the upper portion of the face portion; a sole portion extending rearward from the lower portion of the face portion; and the crown portion A head body including a side portion extending between a toe side edge and a heel side edge of the face portion through a face back between the sole portion and the sole portion,
A cover member that is formed of a low-rigidity material having lower rigidity than the head main body and covers the opening by being joined to the outer periphery of the opening provided in the crown is provided.
A golf club head in which the inside surrounded by the face part, the crown part, the sole part and the side part is a hollow part,
The crown portion is connected to the upper end of the face portion and is displaced upward as it goes backward, and the crown portion is connected to the rear end of the first flange portion and is displaced downward as it goes backward. And a crown rear portion connecting the rear end of the second flange portion and the face back,
The opening is provided from the second flange portion to the crown rear portion,
The first flange portion is constituted by a portion of the head main body,
The second flange portion includes a portion in which the head main body portion and the cover member portion are overlapped and joined,
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,
In the face center reference cross section, the boundary between the upper end of the face part and the front end of the first flange part is defined as a first boundary point, and the height of the crown part from the horizontal plane is maximized. The boundary between the rear end of the first flange and the front end of the second flange is the maximum height point, and the boundary between the rear end of the second flange and the front end of the crown rear is 2 boundary point,
In the reference state, in the face center reference cross section, an angle formed by a straight line connecting the first boundary point and the maximum height point from the horizontal plane with respect to the horizontal plane is the first flange portion. When the first connection angle α with respect to the face portion is set, the first connection angle α is 5 ° or more and 35 ° or less,
In the reference state, in the face center reference cross section, an angle formed by a straight line connecting the maximum height point and the second boundary point with a reference vertical plane Pv perpendicular to the face center reference cross section and the horizontal plane is When the second connection angle β of the second flange portion with respect to the crown portion is set, the second connection angle β is 5 ° or more and 80 ° or less,
In the face center reference cross section, when the distance along the contour of the first flange portion from the first boundary point to the maximum height point is defined as the width W of the first flange portion, the width W Is 5 mm or more and 25 mm or less,
In the face center reference cross section, a portion where the portion of the cover member constituting the second flange portion is located in the foremost position is located behind the maximum height point,
A golf club head characterized by that. In the reference state, in the face center reference cross section, a dimension obtained by projecting the distance from the leading edge of the head body to the rear end of the head body on the horizontal plane is a head width Wh, and the maximum height point from the leading edge. When the distance projected up to the horizontal plane is the front dimension B,
The front dimension B is 15% or more and 50% or less of the head width Wh,
In the reference state, when the distance from the horizontal plane to the maximum height point is a height H in the face center reference cross section, the second boundary point is from the maximum height point toward the horizontal plane. In the range of 5% to 50% of the height H,
The golf club head according to claim 1. The surface area Sc of the cover member with respect to the remaining surface area excluding the surface area of the face surface and the surface area of the sole surface from the surface area of the head body is 50% or more and 80% or less.
3. The golf club head according to claim 1, wherein The crown portion has a concave shape that is recessed toward the sole portion side,
The golf club head according to any one of claims 1 to 3, wherein the golf club head is provided. A first rib that protrudes toward the hollow portion and extends in the toe heel direction and intersects the face center reference cross section at a portion of the head main body constituting the second flange portion; and the first rib And a second rib extending in a direction orthogonal to the extending direction of the first rib,
When the golf club head is viewed from the front of the face surface in the reference state, the distance from the heel side position located 22.23 mm above the horizontal plane to the end portion positioned closest to the toe side is defined as the horizontal plane. The projected dimension is the head length A in the toe heel direction,
When the dimension of the first rib projected in the toe heel direction on the horizontal plane is the length L of the first rib,
The length L of the first rib is 20% or more and 100% or less of the head length A,
The golf club head according to any one of claims 1 to 4, wherein the golf club head is provided. In the face center reference cross section, the second boundary point is located behind a place where the portion of the head main body that constitutes the second flange is located most rearward.
The golf club head according to claim 1, wherein the golf club head is a golf club head. In the face center reference cross section, three measurement points are defined at intervals of 1 mm from the center point of the face surface toward the crown portion, and the radius of curvature of the arc passing through the three measurement points is measured. The curvature radius is sequentially measured by repeating the operation of measuring the three measurement points while displacing them in a direction approaching the crown portion by 1 mm.
The first boundary point is an intermediate measurement point among the three measurement points when a value obtained by dividing the measured radius of curvature by the radius of curvature measured immediately before the first boundary point exceeds twice. Yes,
In the face center reference section, three measurement points are defined at intervals of 1 mm in the direction away from the face surface along the contour of the crown portion behind the maximum height point, and an arc passing through the three measurement points The curvature radius is measured by repeating the operation of measuring the curvature radius while displacing the three measurement points by 1 mm along the contour of the crown portion in the direction away from the face surface. Measure the radius sequentially,
The second boundary point is an intermediate measurement point among the three measurement points when a value obtained by dividing the measured radius of curvature by the radius of curvature measured immediately before the second boundary point exceeds twice. is there,
The golf club head according to any one of claims 1 to 6, wherein:

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