JP6232696B2 - Golf club head - Google Patents

Description

  The present invention relates to a golf club head.

In recent years, a golf club head having a hollow structure has been increased in size for the purpose of improving the flight distance and the directionality of the hit ball.
Since the mass of the golf club head is limited, as the size of the golf club head increases, the volume of the hollow portion increases while the thickness of the golf club head decreases. When the wall thickness is reduced, the rigidity is lowered and vibration is likely to occur, and the hitting sound becomes low and bad.
Therefore, proposals have been made to obtain a high hitting sound with a high sound even with an enlarged golf club head.
Patent Document 1 proposes that the hitting sound is made high by optimizing the structure, arrangement, and mass of the ribs.
Patent Document 2 proposes that the hitting sound be high by defining the shape of the sole portion so that the deflection at the time of hitting can be suppressed.

Japanese Patent No. 4856156 JP 2011-24649 A

However, although there is a certain effect in improving the hitting sound in the above-described prior art, there is room for improvement because the increase in the moment of inertia and weight reduction of the golf club head are not particularly taken into consideration.
The present invention has been made in view of such circumstances, and an object thereof is to provide a golf club head that is advantageous in increasing the moment of inertia and reducing the weight while improving the hitting sound. .

In order to achieve the above object, a first aspect of the present invention is directed to a face portion that forms a face surface that has a vertical height and extends to the left and right, and a crown that extends rearward from the upper portion of the face portion. A toe side portion extending rearward from a toe side end of the face portion and connecting the crown portion and the sole portion, a sole portion extending rearward from a lower portion of the face portion, A hollow golf club head having a heel side portion extending rearward from a heel side end portion of the face portion and connecting the crown portion and the sole portion and connected to the toe side side portion. The golf club head is installed at a predetermined lie angle with respect to a reference plane, and includes a shaft center axis of the golf club head in a reference state in which a face angle is set to 0 °. The plane perpendicular to the reference plane is defined as a virtual plane P0, the contour outside the cross section of the golf club head taken along the virtual plane P0 is defined as a head sectional contour, and intersects the head sectional contour at two locations. A straight line extending in parallel with the reference plane Pr on the virtual plane P0 is defined as a virtual straight line L0, and an intersection located on the toe side of two intersections at which the virtual straight line L0 intersects the head cross-sectional outline is on the toe side. The intersection point Xt, the intersection point located on the heel side as the heel side intersection point Xh, the virtual plane P0 is moved in the face-back direction, and the virtual line L0 is moved in the direction perpendicular to the virtual line L0 on the virtual plane P0. When the head is moved, the head cross-sectional contour line when the distance between the toe side crossing point Xt and the heel side crossing point Xh is maximized is defined as the head maximum cross-sectional contour line. In the maximum cross-section contour of the head, the intersection point Xt of the toe side is the A point, and the intersection of the virtual plane parallel to the reference plane and the maximum cross-section contour of the head at a position spaced 10 mm below the point A The point of intersection on the toe side is point B, and the point of intersection on the toe side is the point C of the two intersection points of the virtual plane parallel to the reference plane and the maximum cross-sectional contour of the head at a position 20 mm below the point A. The length of the straight line that projects the straight line connecting the A point and the B point on the reference plane is more than 0 mm and 3 mm or less, and the straight line that projects the straight line connecting the A point and the C point on the reference plane Is longer than 0 mm and not more than 9 mm, extends in the toe heel direction on the inner surface of the sole portion, and is connected to the inner surface of the toe side portion and the inner surface of the crown portion at the inner surface of the toe side portion. Together with the above Over the ribs connected to the inner surface and the inner surface of the crown portion of the heel-side side portion in the inner surface of the Le-side side portion is provided, the height of the rib is at 4mm 10mm or more or less, the thickness of the rib 0.5 mm or more and 1.5 mm or less, and when the golf club head is viewed in plan, the rib extends along a curve that is convex toward the face portion, and the center point of the face surface and the the most connecting the portion located behind the length of longitudinal component of the linear the golf club head of a straight line obtained by projecting onto the reference surface of the golf club head and the head length Wfb, on said reference plane, said head wherein the first straight line and the toe-side intersection point Xt is located on the largest cross-sectional contour and said heel side intersection Xh connecting the points projected onto the reference plane in a direction perpendicular to the Touhiru direction Gol A straight line moved 0.2 Wfb in front of the club head is defined as a second straight line, and the first straight line is separated by 0.4 Wfb behind the golf club head in a direction perpendicular to the toe heel direction on the reference plane. When the straight line is a third straight line, the contour of the rib projected on the reference plane is located within a range between the second straight line and the third straight line, and the reference line is in the reference state. The front and rear sides of the golf club head passing through a protrusion point that protrudes most to the toe side in the toe heel direction among the projected contour lines obtained by projecting the outer contour line of the cross section of the golf club head fractured in a virtual plane parallel to the plane onto the reference plane A fourth straight line extending in the direction and the projected contour line extending in the toe heel direction through a protruding point that protrudes most rearward of the golf club head in the front-rear direction of the golf club head When the intersection with the fifth straight line is defined as an intersection, the projected contour line is located outside the range of 20 mm from the intersection, the volume of the golf club head is 400 to 470 cc, and the golf The club head has a head mass of 160 to 190 g, and a ratio obtained by dividing the moment of inertia around a vertical line passing through the center of gravity of the golf club head by the head mass is 25 to 30 .

According to the present invention, the toe side portion is separated from the center of gravity of the golf club head toward the toe side by defining the positional relationship between points A to C defined in the maximum cross-sectional contour of the head. Accordingly, the mass of the toe side portion is separated from the center of gravity of the golf club head toward the toe side, which is advantageous in increasing the moment of inertia around the vertical line passing through the center of gravity of the golf club head.
Further, by providing the rib, the rigidity of the sole portion and each side portion can be increased to suppress the vibration of the sole portion at the time of hitting, which is advantageous in increasing the hitting sound.

1 is a front view of a golf club head 10 according to an embodiment as viewed from the front of a face surface 12A. 2 is a plan view showing a reference state in which a golf club head 10 is installed at a predetermined lie angle with respect to a reference plane Pr and a face angle is set to 0 °. FIG. It is a top view which shows the relationship between the golf club head 10 of a reference | standard state, and the virtual plane P0. It is a figure showing the relation between head section outline PG and virtual straight line L0. It is explanatory drawing of A point, B point, and C point prescribed | regulated in the head maximum outline PGmax. FIG. 6 is a diagram comparing a head cross-sectional outline PGmax of the golf club head 10 of the present embodiment and a head cross-sectional outline PGmax ′ of a conventional golf club head. 1 is a schematic perspective view showing an inertia moment measuring device for measuring an inertia moment MI of a golf club head 10. FIG. (A) And (B) is a schematic diagram which shows the measuring method of the moment of inertia MI shown in FIG. 7 in order of a process. FIGS. 7A to 7C are schematic views for explaining a fixing position for fixing the golf club head 10 to the jig 70 when measuring the moment of inertia MI. FIGS. 5 is a schematic diagram for explaining a preferred form of a fixing position for fixing the golf club head 10 to the jig 70 when measuring the moment of inertia. FIG. It is the figure which looked at the state which fractured | ruptured the golf club head 10 in the plane parallel to the reference plane Pr from the upper direction. A state in which the golf club head 10 is broken from a front side of the golf club head 10 in a longitudinal direction of the golf club head 10 by a curved surface that is perpendicular to the reference plane Pr and extends along the rib 28 at a position in front of the rib 28. FIG. An outer contour of a cross section of the golf club head 10 broken along a virtual plane parallel to the reference plane Pr in a reference state in which the golf club head 10 is set to a predetermined lie angle and face angle with respect to the reference plane Pr. It is a figure which shows the projection outline I which projected the line on the reference plane Pr, and the 4th, 5th straight lines L04 and L05. It is a diagram which shows a frequency analysis result. It is an enlarged view of the frequency peak part in FIG. It is a figure which shows the calculation formula for specifying a true primary resonant frequency. It is explanatory drawing of 45 hit points set on the face surface 12A. It is a figure which shows the experimental result of Experimental Examples 1-15 of the golf club head. It is a figure which shows the experimental result of Experimental Examples 16-29 of the golf club head. It is a first explanatory view showing a method for defining the center point Pc of the face surface 12A. It is the 2nd explanatory view showing the regulation method of center point Pc of face face 12A. It is the 3rd explanatory view showing the regulation method of central point Pc of face face 12A. It is the 4th explanatory view showing the regulation method of center point Pc of face face 12A. 4 is a cross-sectional view of the golf club head 10 showing the relationship between the center of gravity point G (center of gravity position) of the golf club head 10 and the center of gravity point Gf on the face surface 12A. FIG. 1 is a front view of a golf club head 10 for explaining a definition of a contour line If of a face surface 12A. 4 is a cross-sectional view of the golf club head 10 for explaining the definition of the contour line If of the face surface 12A. FIG. 3 is a front view of the golf club head 10 for explaining the definition of the center point Pc of the face surface 12A. FIG.

Next, an embodiment of the present invention will be described.
FIG. 1 is a front view of the golf club head 10 as viewed from the front of the face surface 12A.
The golf club head 10 includes a face portion 12, a crown portion 14, a sole portion 16, a toe side portion 18, and a heel side portion 20.
The face portion 12 constitutes a face surface 12A having a vertical height and extending left and right.
The crown portion 14 extends rearward from the upper portion of the face portion 12.
The sole portion 16 extends rearward from the lower portion of the face portion 12.
The toe side portion 18 extends rearward from the toe side end of the face portion 12 and connects the crown portion 14 and the sole portion 16.
The heel side portion 20 extends rearward from the heel side end of the face portion 12, connects the crown portion 14 and the sole portion 16, and is connected to the toe side portion 18.
The golf club head 10 has a hollow structure in which the inside of the face portion 12, the crown portion 14, the sole portion 16, the toe side portion 18 and the heel side portion 20 is a hollow portion.
The crown portion 14 is provided with a hosel 22 connected to the shaft S on the face surface 12A side and at a position near the heel.
In the figure, reference numeral 24 indicates a toe, and reference numeral 26 indicates a heel.
In the present embodiment, the metal usage ratio of the sole portion 16 is 80 to 100%. If the metal usage ratio is 80% or more, it is advantageous for making the hitting sound high, and if the metal usage ratio is less than 80%, the hitting sound tends to be low.
In the present embodiment, the primary resonance frequency obtained by exciting the sole portion 16 is 3000 Hz or more, so that the hitting sound is comfortable for the golfer.

Next, the head maximum cross-sectional outline PGmax of the golf club head 10 is defined.
As shown in FIG. 2, the golf club head 10 is set at a predetermined lie angle with respect to a reference plane (horizontal plane) Pr, and a reference state is set with the face angle set to 0 °.
The method for setting the face angle to 0 ° is as follows.
A plane including the shaft center axis 23 of the golf club head 10 and orthogonal to the reference plane Pr is defined as a virtual plane P0.
The golf club head 10 is placed on the reference plane Pr along the lie angle, and the tangent line La parallel to the reference plane Pr and in contact with the center point Pc of the face surface 12A is around the central axis 23 so as to be parallel to the virtual plane P0. The golf club head 10 is rotated and adjusted.

  The center point Pc of the face surface 12A is the geometric center of the face surface 12A, and the center point Pc is defined by a conventionally known method including a first definition method and a second definition method exemplified below. Various methods can be employed.

[A] First defining method of the center point Pc of the face surface 12A:
This is a method of defining the center point when the boundary between the face surface 12A and another golf club head 10 portion is clear, in other words, when the periphery of the face surface 12A is specified by the ridgeline. In this case, the face surface 12A is clearly defined.
20 to 23 are explanatory views showing a method for defining the center point Pc of the face surface 12A.

(1) First, as shown in FIG. 20, the golf club head 10 is placed on the reference surface so that the lie angle and the face angle become the prescribed 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 14 and the sole portion 16 is obtained.
That is, as shown in FIG. 20, a perpendicular line f0 that intersects with the approximate center point of a line parallel to the ground connecting the toe 24 and the heel 26 (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 12A intersect and the middle point of the b0 where the perpendicular f0 and the lower edge of the face surface 12A intersect are defined as a temporary center point c0.

(3) Next, as shown in FIG. 21, a horizontal line g0 passing through the temporary center point c0 is drawn.
(4) Next, as shown in FIG. 22, the d0 point where the horizontal line g0 and the edge on the toe 24 side of the face surface 12A intersect, and the e0 point where the horizontal line g0 and the edge on the heel 26 side of the face surface 12A intersect. The midpoint is defined as a temporary center point c1.

(5) Next, as shown in FIG. 23, a perpendicular line f1 passing through the temporary center point c1 is drawn, the a1 point where the perpendicular line f1 intersects the upper edge of the face surface 12A, and the perpendicular line f1 and the lower edge of the face surface 12A. 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 12A.
If the temporary center points c1 and c2 do not match, the procedures (2) to (5) are repeated.
Since the face surface 12A has a curved surface, the length of the horizontal line g0 and the lengths of the vertical lines f0 and f1 when determining 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 12A. The length along the line shall be used.
The face center line CL is defined by a straight line that passes through the center point Pc and extends in a direction orthogonal to the toe-heel direction.

[B] Second defining method of the center point Pc of the face surface 12A:
Next, the definition of the center point Pc when the peripheral edge of the face surface 12A and the portion of the other golf club head 10 are connected by a curved surface and the face surface 12A cannot be clearly defined will be described.

As shown in FIG. 24, the golf club head 10 is hollow, the symbol G indicates the center of gravity G of the golf club head 10 (the center of gravity of the golf club head 10), and the symbol Lp indicates the center of gravity G of the golf club head 10. Is a straight line connecting the center of gravity Gf on the face surface 12A, in other words, the straight line Lp is a perpendicular of the face surface 12A passing through the center of gravity G.
Here, as shown in FIG. 25, a large number of planes H1, H2, H3,..., Hn including a straight line Lp connecting the center of gravity G and the center of gravity Gf on the face surface 12A are considered.

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 are no face lines, punch marks, etc. on the face surface 12A.
The curvature radius r0 is continuously measured from the center point Pc of the face surface 12A in the outward direction (upward and downward in FIG. 26).
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 a contour line If representing the periphery of the face surface 12A. The predetermined value is, for example, 200 mm.
A region surrounded by the contour line If determined based on a large number of planes H1, H2, H3,..., Hn is defined as a face surface 12A as shown in FIGS.

Next, as shown in FIG. 27, the golf club head 10 is placed on the horizontal ground so that the lie angle and the face angle become the prescribed values.
The straight line LT passes through the toe side point PT of the face surface 12A and extends in the vertical direction.
The straight line LH passes through the heel side point PH of the face surface 12A 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 12A, and reference symbol Pd indicates a lower point of the face surface 12A. The upper point Pu and the lower point Pd are both intersections of the straight line LC and the contour line If.
The center point Pc is defined by the midpoint of the line segment connecting the upper point Pu and the lower point Pd.
The face center line CL is a straight line passing through the center point Pc and extending in a direction orthogonal to the toe-heel direction, and the straight line LC becomes the face center line CL.

As shown in FIGS. 3 and 4, the contour line outside the cross section of the golf club head 10 taken along the virtual plane P0 is defined as a head cross section contour line PG.
A straight line that intersects the head section contour line PG at two locations and extends in parallel with the reference plane Pr on the virtual plane P0 is defined as a virtual line L0.
Of the two intersections at which the virtual straight line L0 intersects the head cross-sectional outline PG, the intersection located on the toe side is defined as a toe side intersection Xt, and the intersection located on the heel side is defined as a heel side intersection Xh.
Next, when the virtual plane P0 is moved in the face back direction and the virtual straight line L0 is moved in the direction perpendicular to the virtual straight line L0 on the virtual plane P0, as shown in FIG. The head cross section contour line PG when the distance from the heel side intersection Xh is maximum is defined as the head maximum cross section contour line PGmax.

The following points A to C are defined in the head maximum cross-sectional outline PGmax shown in FIG.
Let the toe side intersection Xt be point A.
The intersection point on the toe side of the two intersection points of the virtual plane P1 parallel to the reference plane Pr and the head maximum cross-sectional contour line PGmax at a position spaced 10 mm below the point A is defined as a point B.
An intersection on the toe side of two intersections of the virtual plane P2 parallel to the reference plane and the head maximum cross-sectional contour PGmax at a position spaced 20 mm below the point A is defined as a point C.
At this time, the length Lab of the straight line that projects the straight line connecting the points A and B onto the reference plane Pr is set to be greater than 0 mm and 3 mm or less, and the straight line that projects the straight line connecting the points A and C onto the reference plane Pr The thickness Lac is more than 0 mm and not more than 9 mm.
By defining the positional relationship between the points A to C in this way, the toe side portion 18 is separated from the center of gravity G (FIG. 1) of the golf club head 10 toward the toe side.

FIG. 6 is a diagram comparing the head maximum cross-sectional contour line PGmax of the golf club head 10 of the present embodiment with the head maximum cross-sectional contour line PGmax ′ of the conventional golf club head.
In FIG. 6, the solid line indicates the head maximum cross-sectional outline PGmax of the present embodiment, and the broken line indicates the head maximum cross-sectional outline PGmax ′ of the conventional golf club head 10.
As is apparent from FIG. 6, the head maximum cross-sectional contour line PGmax of the present embodiment is displaced to the toe side as a whole as compared to the conventional head maximum cross-sectional contour line PGmax ′. Therefore, the toe side portion 18 is separated from the center of gravity G of the golf club head 10 to the toe side.
If the straight line length Lab is less than the range of 0 mm to 3 mm or less, or the straight line length Lac is less than the range of 0 mm to 9 mm, the toe side portion 18 is entirely centered on the golf club head 10. Since the effect of increasing the moment of inertia increases because it is too far away from the toe side from G, the curvature of the sole surface tends to be large (closer to a flat surface), and the rigidity of the sole portion 16 of the golf club head 10 decreases. The hitting sound is low.
In addition, if the straight line length Lab exceeds the range of 0 mm to 3 mm or less, or the straight line length Lac exceeds the range of 0 mm to 9 mm, the curvature of the sole surface is likely to be small (closer to a sphere). The rigidity of the sole portion of the golf club head 10 is increased and the hitting sound is preferably high. However, the distance that the entire toe side portion 18 is separated from the center of gravity G of the golf club head 10 to the toe side is shortened, and inertia. The effect of increasing the moment is reduced.

Here, a method of measuring the moment of inertia MI around the vertical line passing through the center of gravity G of the golf club head 10 will be described with reference to FIGS.
Here, FIG. 7 is a schematic perspective view showing a moment of inertia measuring device of the golf club head 10. The moment of inertia MI of the golf club head 10 of the present embodiment is measured by the moment of inertia measuring device shown in FIG.

The inertia moment measuring device 60 includes a measurement unit 62, a calculation unit 64, a start lever 66, a display unit 68, and an operation button 69. A measurement object of inertia moment is placed on the measurement unit 62, and the start lever 66 is moved. An apparatus for measuring the moment of inertia through the calculation unit 64 by displaying the numerical value of the moment of inertia on the display unit 68 by measuring the moment of torsional vibration at this time by measuring the period of torsional vibration after the hand is picked and displaced. It is.
An example of the inertia moment measuring device 60 is inertial moment measuring device Model MOI-005-014 manufactured by Inertia Dynamics. Such a moment of inertia measuring device may be a known one, and is not particularly limited in the present invention.

As shown in FIG. 8A, the jig 70 is fixed to the moment of inertia measuring device 60, and the moment of inertia Ia of the jig 70 is measured.
Next, as shown in FIG. 8B, the sole portion 16 of the golf club head 10 is fixed to the upper surface portion 72 of the jig 70, and the total moment of inertia Ib of the golf club head 10 and the jig 70 is measured. . Next, the inertia moment MI of the golf club head 10 is obtained from (Ib−Ia) from the obtained inertia moments Ia and Ib.
In the normal moment of inertia measuring device 60, the numerical value Ia is automatically tared by a series of procedures using the operation button 69, and the numerical value (Ib-Ia) is displayed.

In order to fix the golf club head 10 and the jig 70, for example, a double-sided tape, fixing with an adhesive such as clay, fixing with an adhesive, or fixing using magnetic force may be used.
For fixing, the sole portion 16 of the golf club head 10 is fixed to the upper surface portion 72 of the jig 70. However, if the sole portion 16 has a convex curved surface, the upper surface portion 72 is preferably a concave curved surface that matches the convex curved surface. If the sole portion 16 is flat, the upper surface portion 72 is A flat surface is preferred. That is, it is preferable that both surfaces to be fixed coincide.
When the sole portion 16 of the golf club head 10 is a curved surface, an adhesive body (not shown) is provided so as to match the sole portion 16 and the upper surface portion 72, and the golf club head 10 is fixed. In this case, it is needless to say that an adhesive having an internal mass of a fixing means such as an adhesive is included in a part of the jig and is tared in the same manner as the jig.

The golf club head 10 passes through the center of gravity G of the golf club head 10 shown in FIG. 9A and is orthogonal to the horizontal plane B, and the rotation of the torsional vibration of the moment of inertia measuring device 60 shown in FIG. 9B. As shown in FIG. 9C, the axis r is preferably fixed to the moment of inertia measuring device 60 so as to coincide with or substantially coincide with the axis r.
The term “substantially coincides” means that the distance between the point where the rotation axis r passes through the horizontal plane B and the point p where the straight line V passes through the horizontal plane B is within 3 mm, preferably within 2 mm, more preferably within 1 mm.
By fixing the sole portion 16 of the golf club head 10 within this range, the inertia moment MI of the golf club head 10 can be measured more accurately.

Further, the distance between the point where the rotation axis r passes through the horizontal plane B and the point p where the straight line V passes through the horizontal plane B is not necessarily within the above range, and this distance is known and automatically tared. Correction can be made by subtracting a product obtained by multiplying the mass of the golf club head 10 by the square of this distance from the obtained numerical value of (Ib−Ia).
The moment of inertia MI of the golf club head 10 may be obtained by this correction method. Thus, the method for measuring the moment of inertia MI of the golf club head 10 is not particularly limited.

The rotational moment r of the inertia moment measuring device 60 and the point where the rotational shaft r passes through the sole portion 16 are determined by the inertia moment measuring device 60. The rotation axis r is preferably vertical or substantially vertical.
Here, “substantially vertical” means that the inclination with respect to the vertical direction is within 2 °, preferably within 1 °. In order to set the rotation axis r to be vertical or substantially vertical, the level of the measuring instrument 60 is adjusted as a guide, and the level of the measuring instrument is adjusted, or the measuring instrument is horizontally adjusted. It is possible to install it on top.
By setting within the above range, it is possible to more accurately measure the moment of inertia MI around the rotation axis with the straight line V passing through the center of gravity G of the golf club head 10 and orthogonal to the horizontal plane B as the first rotation axis. .

Further, the plane supported by the upper surface portion 72 of the jig 70 is preferably horizontal or substantially horizontal. In the present invention, the term “substantially horizontal” means that the inclination with respect to the horizontal plane is within 2 °, preferably within 1 °.
By setting within the above range, the moment of inertia MI of the golf club head 10 can be measured more accurately.

The jig 70 is preferably attached to the moment of inertia measuring device 60 so that the position of the center of gravity of the jig itself coincides with or substantially coincides with the rotation axis r. As shown in FIG. 10, when the center of gravity position of the jig 70 is C as shown in FIG. 10, the distance δ between the center of gravity C and the rotation axis r is within 2 mm, preferably within 1 mm.
By setting the center of gravity C of the jig 70 within the above range, the moment of inertia MI of the golf club head 10 can be measured more accurately.

FIG. 11 is a view of a state in which the golf club head 10 is broken along a plane parallel to the reference plane Pr as viewed from above. FIG. 12 shows the golf club head 10 at a location ahead of the rib 28 in the front-rear direction of the golf club head 10. FIG. 6 is a view of a state in which the surface is broken along a curved surface that is orthogonal to the reference plane Pr and extends along the rib 28, as viewed from the front of the golf club head 10.
As shown in FIGS. 11 and 12, the golf club head 10 extends on the inner surface of the sole portion 16 in the toe heel direction, and the inner surface of the toe side side portion 18 and the crown portion 14 on the inner surface of the toe side side portion 18. A rib 28 connected to the inner surface and connected to the inner surface of the heel side portion 20 and the inner surface of the crown portion 14 is provided on the inner surface of the heel side portion 20.
In this embodiment, the case where one rib 28 is provided will be described, but two or more ribs 28 may be provided.

Here, the length of the component in the front-rear direction of the straight golf club head 10 obtained by projecting the straight line connecting the center point Pc of the face surface 12A and the position Pb located farthest rearward of the golf club head 10 onto the reference plane Pr. The length is Wfb.
On the reference plane Pr, 20% of Wfb in front of the golf club head 10 in the direction perpendicular to the toe heel direction is a first straight line L01 that connects the point where the toe side intersection Xt and the heel side intersection Xh are projected onto the reference plane Pr. The moved straight line is defined as a second straight line L02.
A straight line obtained by moving 40% (0.4 Wfb) of Wfb to the rear of the golf club head 10 in the direction perpendicular to the toe heel direction on the reference plane Pr is defined as a third straight line L03.
The rib 28 is formed so that the contour of the rib 28 projected onto the reference plane Pr is located within the range between the second straight line L02 and the third straight line L03.
In FIG. 11, for convenience of explanation, the intersection points Xt and Xh on the reference plane Pr and the straight lines L01 to L03 are shown superimposed.

The rib 28 includes a toe side rib portion 28 </ b> A located on the inner surface of the toe side side portion 18, a heel side rib portion 28 </ b> B located on the inner surface of the heel side side portion 20, and a sole rib portion 28 </ b> C located on the inner surface of the sole portion 16. ing.
The sole rib portion 28 </ b> C has a constant height Hc from the inner surface of the sole portion 16.
The toe side rib portion 28A has a high portion 2802 whose height Ha from the inner surface of the toe side portion 18 is larger than the height Hc of the sole rib portion 28C.
The heel side rib portion 28B has a high portion 2804 whose height Hb from the inner surface of the heel side side portion 20 is larger than the height Hc of the sole rib portion 28C.
The heights of these high portions 2802 and 2804 are 1.5 to 2.5 times the height Hc of the sole rib portion 28C.
In the present embodiment, most of the toe side rib portion 28A is the high portion 2802, and most of the heel side rib portion 28B is the high portion 2804.
A portion of the toe side rib portion 28A connected to the sole rib portion 28C is a height transition portion 2810 in which the height smoothly changes from the toe side rib portion 28A to the sole rib portion 28C, and the heel side rib portion 28B. Of these, the portion connected to the sole rib portion 28C is a height transition portion 2812 whose height smoothly changes from the heel side rib portion 28B to the sole rib portion 28C.

The reason why the rib 28 is constituted by the toe side rib portion 28A, the heel side rib portion 28B, and the sole rib portion 28C as described above is as follows.
The toe side portion 18 and the heel side portion 20 are formed in a shape closer to a plane in order to increase the moment of inertia. Therefore, the rigidity is lowered and the hitting sound tends to be low. Therefore, in order to improve the hitting sound, the toe side rib portion 28A and the heel side rib portion 28B have a higher height.
In particular, the rigidity of the toe side portion 18 having a shape close to a plane tends to be low. On the other hand, the heel side portion 20 having a shape close to a plane has a higher rigidity than the toe side portion 18 because the thick hosel 22 is joined.
On the other hand, the sole portion 16 generally has a small curvature and high rigidity. Therefore, the height of the sole rib portion 28C may be lower than the height of the toe side rib portion 28A.
Therefore, since the rib height is appropriately arranged, it is advantageous in suppressing the mass of the rib 28 while increasing the rigidity of the sole portion 16 and the side portions 18 and 20. That is, the degree of freedom in designing the golf club head 10 can be improved.

In the present embodiment, the height of the ribs 28, that is, the heights Ha, Hb, and Hc are 4 mm or more and 10 mm or less, and the thickness (width) of the ribs 28 is 0.5 mm or more and 1.5 mm or less.
When the height and width of the rib 28 are within the above ranges, it is advantageous for suppressing the mass of the rib 28 while increasing the rigidity of the sole portion 16 and the side portions 18 and 20.
If the height and width of the ribs 28 are less than the above range, it is disadvantageous in increasing the rigidity of the sole portion 16 and the side portions 18 and 20, and if the height and width of the ribs 28 is above the above range, This is disadvantageous in suppressing the mass of 28.
Further, when the golf club head 10 is viewed in plan, the rib 28 extends along a curved line that is convex toward the face portion 12.
Therefore, it is advantageous in securing the rigidity of the portion of the sole portion 16 near the face portion 12 that is easily deflected when hit.
When the golf club head 10 is viewed in plan, the rib 28 may extend along a straight line (first straight line L01) parallel to the toe heel direction. This is more advantageous in securing the rigidity of the portion.

FIG. 13 is a cross-sectional view in which the golf club head 10 is broken along a virtual plane parallel to the reference plane Pr in a reference state in which the golf club head 10 has a predetermined lie angle and face angle of 0 ° with respect to the reference plane Pr. It is a figure which shows the projection outline I which projected the outline of the outer side of to the reference plane, and the 4th, 5th straight lines L04 and L05.
The fourth straight line L04 extends in the front-rear direction of the golf club head 10 through the projection point Px that protrudes most to the toe side in the toe heel direction of the projection contour I on the reference plane Pr.
On the reference plane Pr, the fifth straight line L05 extends in the toe heel direction through a protruding point of the projected contour line I that protrudes most rearward of the golf club head 10 in the front-rear direction of the golf club head 10.
A point where the fourth straight line L04 and the fifth straight line L05 intersect is defined as an intersection Pxy.
At this time, the golf club head 10 is formed so that the projected contour I is located outside the range of 20 mm from the intersection Pxy.
The golf club head 10 formed so that the projected contour line I is located within a range of 20 mm from the intersection Pxy is called a quadrangle driver because it has a quadrangular shape when viewed in plan. A square driver generally has a larger area of the sole portion 16 and the side portions 18 and 20 than a golf club head that is not square.
Therefore, even if the rectangular driver is formed with the ribs 28 similar to the present embodiment, the area of the sole portion 16 and the side portions 18 and 20 is too large, the rigidity is not easily increased, and the hitting sound tends to be low. . In order to increase the rigidity, the height of the rib may be increased. However, if the height is higher than the range of the rib height in the present invention, the mass of the rib increases too much, and the design freedom of the golf club head 10 is increased. Will fall. Therefore, when the ribs 28 are reduced in order to suppress the mass, the improvement in rigidity cannot be expected so much, and the effect of improving the hitting sound as described later cannot be expected so much.
On the other hand, in the golf club head 10 in which the projection contour line I is located outside the range of 20 mm from the intersection Pxy as in the present invention, the areas of the sole portion 16 and the side portions 18 and 20 are not so large. Even if formed, the mass of the golf club head 10 can be easily suppressed, and the ribs 28 sufficient to ensure sufficient rigidity can be provided, and an effect of improving the hitting sound can be expected.

In the present embodiment, the volume V of the golf club head 10 is 400 to 470 cc, the head mass W of the golf club head 10 is 160 to 190 g, and the center of gravity G of the golf club head 10 is determined. The ratio obtained by dividing the moment of inertia MI around the passing vertical line by the head mass W was 25-30.
If the three values of the volume V, the mass W, and the ratio obtained by dividing the moment of inertia MI by the head mass W are within the above ranges, respectively, the weight can be reduced while the moment of inertia MI is secured. Since it can prevent the appearance from becoming too small or too large, it is more advantageous for improving the ease of swinging while improving the flight distance and the direction of the hit ball without feeling uncomfortable for the golfer. Become.

  In the present embodiment, if the golf club to which the golf club head 10 is attached is a long golf club having a club length of 46.0 to 48.0 inches, the effect of improving the head speed can be achieved, and even a lightweight head can be swung. The balance is the optimum value, and there is an effect of improving the ease of swinging, and also the moment of inertia is secured, so even if the hit points vary, it is more advantageous for improving the flight distance and the direction of the hit ball Become.

Next, the effect of the golf club head 10 of this Embodiment is demonstrated.
By defining the positional relationship between points A to C defined by the head maximum cross-sectional outline PGmax, the toe side portion 18 is separated from the center of gravity G of the golf club head 10 toward the toe side.
Therefore, since the mass of the toe side portion 18 is separated from the center of gravity G of the golf club head 10 toward the toe side, the moment of inertia MI around the vertical line passing through the center of gravity G of the golf club head 10 is increased. It will be advantageous.
Further, the inner surface of the sole portion 16 extends in the toe heel direction, and is connected to the inner surface of the toe side side portion 18 and the inner surface of the crown portion 14 on the inner surface of the toe side side portion 18, and the inner surface of the heel side side portion 20 Ribs 28 connected to the inner surface of the heel side portion 20 and the inner surface of the crown portion 14 are provided, and the contour of the ribs 28 projected onto the reference plane Pr is between the second straight line L02 and the third straight line L03. It is formed so as to be located within the range.
By providing such ribs 28, the rigidity of the sole portion 16 and the side portions 18 and 20 can be increased to suppress the vibration of the sole portion 16 at the time of hitting, which is advantageous in increasing the hitting sound.

Hereinafter, experimental examples of the present invention will be described.
In the following description of the experimental examples, the same portions and members as those in the above embodiment are denoted by the same reference numerals, and the description thereof is omitted.
18 and 19 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 the following test was performed on one golf club head 10.
The experimental example was set to experimental example 1 to experimental example 29 by changing parameters to be described later.

The evaluation items are as follows.
1) Ball hitting sound The pitch of a ball hitting a golf ball with the golf club head 10 was evaluated by an index. The index of Experimental Example 29 as a conventional example is set to 100, and the larger the index, the better the evaluation. Since this experiment example differs only in the sole part 16 and the other parts are the same, it can be said that it is a hitting sound comparison of the sole part 16.
A hitting sound having a primary resonance frequency of 3000 Hz or higher of the sole portion 16 is evaluated as being comfortable for a golfer, and a hitting sound having a primary resonance frequency of 2500 Hz or less is hardly evaluated as being comfortable for a golfer.
Therefore, the index was calculated such that the higher the value of the primary resonance frequency, the larger the index, and the lower the value of the primary resonance frequency, the smaller the index.

The evaluation method of the primary resonance frequency is as follows.
The hitting sound generated from the golf club head 10 causes the face surface 12, the crown surface 14, and the sole surface 16 of the golf club head 10 to vibrate due to the impact generated when the face surface 12 of the golf club head 10 hits a golf ball. It is composed of sound generated by doing.
In the present invention, vibration of the sole portion 16 is particularly important, and frequency measurement of the sole portion 16 will be described. Of course, the measurement other than the sole portion 16 is the same.

The measurement of the frequency of the hitting sound is performed by the following method, for example.
The hosel 18 of the golf club head 10 is suspended in the air or supported in advance.
The sole portion 16 is vibrated by striking (striking) with a hammer, and a striking sound generated by the vibration is measured with a sound level meter.
In addition, what is necessary is just to let the location of the sole part 16 vibrated with a hammer be the geometric center of the sole part 16. Further, when the sole portion 16 is divided into a plurality of regions in order to give design, the geometric center of the region having the largest area may be vibrated with a hammer.
The impact sound measured by a sound level meter is taken into a personal computer via an A / D converter, and frequency analysis is performed using a known method such as FFT (Fast Fourier Transformation), and the frequency with the highest sound pressure (vibration) is obtained. It is specified as the primary resonance frequency.
In this way, the primary resonance frequency of the sole portion 16 is measured.

Note that the following method may be used instead of measuring the impact sound with a sound level meter.
1) An acceleration pickup is attached to the sole portion 16 in advance. The acceleration signal of the vibration generated by the vibration is measured with an acceleration pickup, and the primary resonance frequency is measured by analyzing the frequency of the acceleration signal.
2) The vibration of the sole portion 16 is measured with a laser vibrometer (laser Doppler vibrometer). The acceleration signal of the vibration generated by the excitation is measured with a laser vibrometer, and the primary resonance frequency is measured by analyzing the frequency of the acceleration signal.

By the way, when measuring an acceleration signal, as shown in FIG. 14, when two peaks are obtained with the first and second frequencies f1 and f2 having the same acceleration L as a result of frequency analysis, the first, It is preferable to specify the intermediate frequency between the second frequencies f1 and f2 as a true primary resonance frequency in order to more accurately evaluate the primary resonance frequency.
Therefore, in the present embodiment, the true primary resonance frequency f0 is obtained by calculating the weighted average of the first and second frequencies f1 and f2 by the following procedure.

FIG. 15 is an enlarged view of a peak portion in FIG.
As shown in FIG. 15, for example, with data Dn as a peak value, the plurality of data Dn−1, Dn−2, Dn + 1, and Dn + 2 before and after that decrease as the distance from the data Dn increases.
However, since each data is measured discretely, in the example shown in FIG. 15, the true peak value is predicted to be higher than the data Dn as indicated by the symbol ● in the figure. .
Therefore, the true peak value L1 of the first frequency f1 is obtained from the equation (1) in FIG. 16, and the true peak value L2 of the second frequency f2 is obtained from the equation (2). In the expressions (1) and (2), Li indicates a plurality of data. In addition, although the case where data Dn-1, Dn-2, Dn + 1, Dn + 2 and five data are used was illustrated, the number of data is arbitrary.

When the true peak values L1 and L2 are obtained, the acceleration peak values L1 and L2 indicated by the dB value are obtained from the acceleration linear values Acc1 and Acc1, respectively, according to the equations (3) and (4) in FIG. Convert to Acc2.
Next, linear values Acc1 and Acc2 of acceleration are converted into displacements Disp1 and Disp2 by the equations (5) to (8) in FIG.
If the displacements Disp1 and Disp2 are obtained, the weighted average of the first and second frequencies f1 and f2 is obtained by using the displacements Disp1 and Disp2 according to the equation (9) in FIG. Obtained as the primary resonance frequency f0.

  In addition, when the primary resonance frequency of the sole portion 16 having the largest surface size and the difference in the hitting sound most likely to occur is 3000 Hz or more, the hitting sound is evaluated as being comfortable for the golfer. When the primary resonance frequency is 2500 Hz or less, it is difficult to evaluate that the hitting sound is comfortable for the golfer. This is presumably because the size of the surface is the widest and the influence of the hitting sound of the lower primary resonance frequency of the sole portion 16 becomes dominant. Accordingly, it is preferable that the primary resonance frequency of the sole portion 16 is 3000 Hz or more in order to obtain a comfortable hitting sound.

2) Directionality Test strikes were given to 50 testers with head speeds of 35 to 45 m / s with a pin provided at a predetermined position in the hitting ball field as a target. The flight distance (yard) from the hit position to the position where the ball stopped is recorded, and the distance from the hit ball stop position to the pin is recorded as the direction blur width (yard).
These were performed ten balls each for one golf club, and the standard deviation of the flight distance and the direction blur width was obtained.
In addition, an index with the average value of standard deviations of the golf club head 10 of Experimental Example 29 as 100 is shown. The larger the index, the better the evaluation.

3) Flying distance As shown in FIG. 17, 45 points at equal intervals in the toe heel direction and the crown sole direction around the center point Pc of the face surface 12A were set as the hit points Pi.
A golf club was swung at 45 hit points using a dedicated swing robot, and the flying distance of the ball was measured to obtain an average value. The head speed was 40 m / s.
In this case, the golf club head 10 of Experimental Example 29 is shown as an index with the average value of the flight distance of the golf club head 10 as 100. The larger the index, the better the evaluation.

4) Total score The total score is the sum of the indices of directionality, flight distance, and durability.

Next, each parameter described in FIGS. 18 and 19 will be described.
1) Length Lab (mm) of a straight line obtained by projecting a straight line connecting points A and B onto the reference plane Pr
2) The length Lac (mm) of the straight line projected from the straight line connecting points A and C
As described with reference to FIG. 5, the lengths of the straight lines defined based on the points A, B, and C defined by the head maximum cross-sectional contour line PGmax are Lab and Lac.

3) Range where ribs 28 are formed Ar (%)
On the reference plane Pr, the rib 28 displays a range of X% of Wfb in front of the golf club head 10 with respect to the first straight line L01, and “FX%” with a sign F added to X%.
On the reference plane Pr, the rib 28 displays the range of Y% of Wfb behind the golf club head 10 with respect to the first straight line L01, and “BX%” with the sign B added to X%.

4) Height Hr (mm) of the rib 28
The height of the rib 28 from the inner surface of the sole part 16, the toe side part 18, and the heel side part 20 is shown.
5) Thickness Tr (mm) of rib 28
The thickness (width) of the rib 28 is shown.

6) Shape of the rib 28 The shape of the rib 28 when viewed from above is shown.
A case where the rib 28 extends along the convex curve toward the face portion 12 is referred to as a “curve”, and a case where the rib 28 extends along a straight line parallel to the toe heel direction is referred to as a “straight line”.

7) Head mass W (g)
The mass of the golf club head 10 is shown.
8) Head volume V (cc)
The volume of the hollow part of the golf club head 10 is shown.

9) Moment of inertia MI (g · cm ² )
The moment of inertia MI around the vertical line passing through the center of gravity G of the golf club head 10 and is measured by the measurement method described above.

10) MI / W
A ratio obtained by dividing the moment of inertia MI by the mass W of the head is shown.

11) Presence / absence of projected contour line I within a range of 20 mm from the intersection Pxy This indicates whether or not the projected contour line I of the golf club head 10 is within the range of 20 mm from the intersection Pxy defined in FIG.

12) Club length CL (inch)
The club length of the golf club to which the golf club head 10 is attached is shown.

13) Metal usage ratio α (%) of the sole portion 16

14) Height H2 of the high portions 2802, 2804 / Height H2 of the sole rib portion 28C
This is a ratio obtained by dividing the height H1 of the high portions 2802 and 2804 of the toe side rib portion 28A and the heel side rib portion 28B by the height H2 of the sole rib portion 28C.
In Experimental Examples 1 to 28, the heights H1 of the high portions 2802 and 2804 were set to be the height Ha of the toe side rib portion 28A and the height Hb of the heel side rib portion 28B.
Further, the height H2 of the sole rib portion 28C = the height Hc of the sole rib portion 28C.

Next, Experimental Examples 1 to 29 will be described.
Experimental Examples 1 to 3 and 6 to 28 are within the scope of the present invention.
Experimental examples 4, 5, and 29 are outside the scope of the present invention.
Experimental example 29 corresponds to the conventional example, in which the straight line lengths Lab and Lac are below the specified range, and the ribs 28 are not provided.

  Experimental Examples 1 to 3 satisfy all the provisions of claims 1 to 5.

In Experimental Example 4, the straight line length Lab is 4.2 mm, which exceeds the range of 0 mm to 3 mm, and the straight line length Lac is 10.4 mm, which exceeds the range of 0 mm to 9 mm.
Further, since the range Ar where the ribs 28 are formed is 50% of Wfb rearward, it deviates from the range of 40% of Wfb.

In Experimental Example 5, the straight line length Lab is 0.0 mm, which is a value outside the range of more than 0 mm and 3 mm or less. The straight line length Lac is also 0.0 mm, which is outside the range of more than 0 mm and not more than 9 mm.
Further, since the range Ar where the ribs 28 are formed is 30% of Wfb forward, it deviates from the range of 20% of Wfb.

  In Experimental Example 6, the straight line length Lab is 2.8 mm, which is close to the upper limit value in the range of 0 mm to 3 mm, and the straight line length Lac is 8.7 mm and is in the range of 0 mm to 9 mm. It is a value close to the upper limit value.

  In Experimental Example 7, the straight line length Lab is 0.3 mm, which is close to the lower limit of the range of 0 mm to 3 mm, the straight line length Lac is 0.2 mm, and the range of 0 mm to 9 mm. It is a value close to the lower limit value.

  In Experimental Example 8, since the range Ar in which the ribs 28 are formed is 38% of Wfb rearward, the value is close to the upper limit value of the range of 40% of Wfb.

  In Experimental Example 9, since the range Ar in which the ribs 28 are formed is 18% of Wfb forward, the value is close to the upper limit value of the range of 20% of Wfb.

In Experimental Example 10, the mass W of the head is 156 g, which is below the range of 160 to 190 g.
Further, the moment of inertia MI is 3850g · cm ^2, compared to 4650g · cm ² of Example 29 as a reference and has a lower value.
Moreover, MI / W is 24.7 and is less than the range of 25-30.

In Experimental Example 11, the mass W of the head is 195 g, which exceeds the range of 160 to 190 g. All other provisions are met.
Further, the moment of inertia MI is 5900 g · cm ^2, which is an extremely high value compared to 4650 g · cm ² of the experimental example 29 serving as a reference.
MI / W is 30.3, which exceeds the range of 25-30.

In Experimental Example 12, the mass W of the head is 161 g, which is a value close to the lower limit of the range of 160 to 190 g.
In addition, the moment of inertia MI is 4050 g · cm ^2, which is higher than that of 4650 g · cm ² of the experimental example 29 serving as a reference.
Moreover, MI / W is 25.2 and is in the range of 25-30.

In Experimental Example 13, the mass W of the head is 189 g, which is a value close to the upper limit value in the range of 160 to 190 g.
Further, the moment of inertia MI is 5600 g · cm ^2, which is higher than that of 4650 g · cm ² of the experimental example 29 serving as a reference.
Moreover, MI / W is 29.6 and is in the range of 25-30.

  In Experimental Examples 14 and 15, the head mass W and MI / V are close to the lower limit value or the upper limit value of the specified range, and the projection contour line I is within the range of 20 mm from the intersection Pxy. The golf club head 10 has a quadrangular shape.

  In Experimental Example 16, the volume V of the head is 395 cc, which is below the range of 400 to 470 cc.

  In Experimental Example 17, the volume V of the head is 475 cc, which exceeds the range of 400 to 470 cc.

  In Experimental Example 18, the volume V of the head is 410 cc, which is close to the lower limit value in the range of 400 to 470 cc.

  In Experimental Example 19, the volume V of the head is 465 cc, which is a value close to the upper limit value in the range of 400 to 470 cc.

  In Experimental Example 20, the club length CL is 45.5 inches, which is below the range of 46.0 to 48.0 inches.

  In Experimental Example 21, the club length CL is 48.5 inches, which exceeds the range of 46.0 to 48.0 inches.

  In Experimental Example 22, the club length CL is 46.0 inches, which is the lower limit value in the range of 46.0 to 48.0 inches.

  In Experimental Example 23, the club length CL is 48.0 inches, which is the upper limit value in the range of 46.0 to 48.0 inches.

  In Experimental Example 24, the metal usage ratio α of the sole portion 16 is 79%, which is below the range of 80% to 100%.

  In Experimental Example 25, the metal usage ratio α of the sole portion 16 is 84%, which is in the range of 80% to 100%.

  In Experimental Example 26, the height H1 of the high portion and the height H2 of the sole rib portion 28C are 1.4 times, which is below the range of 1.5 to 2.5 times.

  In Experimental Example 27, the height H1 of the high portion and the height H2 of the sole rib portion 28C are 2.6 times, which is higher than the range of 1.5 to 2.5 times.

  In Experimental Example 28, the height H1 of the high part / the height H2 of the sole rib portion 28C is 2.4 times, which is a value close to the upper limit value in the range of 1.5 to 2.5 times.

Experimental example 29 corresponds to the conventional example, the straight line length Lab is 1.9 mm and is in the range of more than 0 mm to 3 mm and the straight line length Lac is 6.7 mm and more than 0 mm and 9 mm. Within the following range.
However, the ribs 28 are not formed.

Comparison of Experimental Examples 1-3, 6-28 within the scope of the present invention and Experimental Examples 4, 5, 29 outside the scope of the present invention reveals the following.
1) In Experimental Examples 1 to 3 and 6 to 28 within the scope of the present invention, the hitting sound is 90 to 170 points, the flight distance is 87 to 148 points, the directionality is 87 to 148 points, and the total points are 303 to 466. Is a point.

2) In Experimental Examples 4, 5, and 29 outside the scope of the present invention not satisfying the provisions of claim 1, the hitting sound is 87 to 100 points, the flight distance is 100 to 109 points, and the directionality is 100 to 103 points. The total score is 300 to 303, which is disadvantageous in securing the hitting sound, flight distance, and directionality as compared with Experimental Examples 1 to 3 and 6 to 28 within the scope of the present invention.

3) In Experimental Examples 1 to 3 that satisfy all of the provisions of claims 1 to 5, the hitting sound is 167 to 170 points, the flight distance is 147 to 148 points, the directionality is 146 to 148 points, and the total number is 460 to 460. Compared to 466 points and Experimental Example 29, this is the most advantageous in improving the hitting sound, securing the directionality and the flight distance.

4) In Examples 10 and 11 where the masses W and MI / V of the head of claim 2 are out of the range, the hitting sound is 147 and 148 points, the flight distance is 89 and 90 points, the directionality is 88 and 89 points, The total points are 325 and 326 points.
The experiment example 10 is because the swing of the head tends to vary because the mass W of the head is light, and the flight distance decreases because the hit points vary.
In Experimental Example 11, the head mass W is heavy, so the head speed decreases and the flight distance decreases.
On the other hand, in Experimental Examples 12 and 13 in which the masses W and MI / V of the head of claim 2 are values close to the upper limit value or the lower limit value, the hitting sounds are 145 and 146 points, the flying distance is 133 points, and the directionality Are 138, 140 points, and the total points are 416, 419 points, which is advantageous in improving the hitting sound, securing the directionality and the flight distance.
Further, although the upper limit value or the lower limit value of the range of the mass W and MI / V of the head of claim 2 is present, the projection contour line I is within a range of 20 mm from the intersection Pxy, and the golf club head 10 is so-called. In Experimental Examples 14 and 15 having a square shape, the hitting sound is 94 and 95 points, the flying distance is 114 and 115 points, the directivity is 113 and 116 points, and the total points are 322 and 325 points. It is more disadvantageous than Experimental Examples 12 and 13 in securing directionality and flight distance.
This is because the golf club heads of Experimental Examples 14 and 15 have a quadrangular shape, so that it is easy to give the golfer a sense of incongruity. Therefore, swing variation is large, variation in hit points is large, and the area of the sole portion 16 is large. Because it is large, it tends to be a bass hitting sound, and there is a limit to improving the hitting sound.

5) In Experimental Example 16 in which the volume V and MI / W of the head of claim 2 are below the range, the ball hitting sound is 151 points, the flying distance is 87 points, the directionality is 87 points, and the total point is 325 points. Although the sound is improved, it is disadvantageous compared to Experimental Example 29 in securing the directionality and the flight distance.
This is because the golf club head 10 is too small and the hit points are likely to vary and the flight distance is reduced.
Further, in Experimental Example 17 which exceeds the ranges of the volume V and MI / W of the head according to claim 2, the direction of the ball hitting sound is 95 points, the flying distance is 114 points, the directionality is 113 points, and the total point is 322 points. However, it is more disadvantageous than Experimental Example 29 in improving the hitting sound.
This is because the golf ball head 10 is too loud and the hitting sound is low.
On the other hand, in Examples 18 and 19 near the upper limit value or lower limit value of the range of volume V and MI / W of claim 2, the hitting sound is 148, 152 points, the flight distance is 130, 132 points, and the directionality is The hitting sound is improved by 133 and 140 points, and the total points are 417 and 418 points, which is advantageous in comparison with Examples 16 and 17 in securing the directionality and the flight distance.

6) In Experimental Example 20 in which the club length CL of claim 3 is below the range of 46 to 48 inches, the hitting sound is 165 points, the flying distance is 89 points, the directionality is 91 points, and the total score is 345 points. Although the hitting sound is improved, it is disadvantageous compared to Experimental Example 29 in securing the directionality and the flight distance.
This is because the club length CL is too short, so the head speed is reduced and the flight distance is reduced.
Further, in Experimental Example 21 in which the club length CL of claim 3 exceeds the range of 46 to 48 inches, the hitting sound is 160 points, the flying distance is 99 points, the directionality is 88 points, and the total score is 347 points. Although the hitting sound is improved, it is disadvantageous compared to Experimental Example 29 in securing the directionality and the flight distance.
This is because the club length CL is too long, so that the hit points vary and it is difficult to secure the flight distance.
On the other hand, in Experimental Examples 22 and 23, the club length CL of Example 3 is close to the lower limit value or the upper limit value in the range of 46 to 48 inches, the hitting sound is 162, 164 points, the flight distance is 131, 139 points, the directionality 132, 142 points, the total score is 435 points, and the ball sound is improved, which is more advantageous than Examples 20 and 21 in securing directionality and flight distance.

7) In Example 24 where the metal usage ratio α of the sole portion 16 of claim 4 is 79% and falls below the range of 80 to 100%, the hitting sound is 90 points, the flight distance is 135 points, and the directionality is 134. Although the point and total points are 359 points and the directionality and the flight distance are improved, the improvement of the spherical sound is disadvantageous compared to the experimental example 29.
This is because the rigidity of the sole portion 16 is insufficient because the metal usage ratio α is low.
On the other hand, in Example 25 where the metal usage ratio α of the sole portion 16 of claim 4 is 84% and is close to the lower limit of the range of 80 to 100%, the hitting sound is 147 points, the flying distance is 147 points, and the directionality is 146 points, the total score is 440 points, the ball sound is improved, and it is advantageous compared with Example 24 in securing directionality and flight distance.
This is because the metal usage ratio α exceeds 80% and the rigidity of the sole portion 16 is ensured.

8) The height H1 of the high portion of claim 5 / the height H2 of the sole rib portion 28C is 1.4, which is less than the range of 1.5 to 2.5, the shot sound is 130 points, The flying sound is 120 points, the directivity is 120 points, the total point is 370 points, and the ball sound is improved, which is advantageous in comparison with the embodiment 29 in securing the directivity and the flying distance.
Further, in Experimental Example 27 in which the height H2 of the high portion of Claim 5 / the height H2 of the sole rib portion 28C is 2.6 and exceeds the range of 1.5 to 2.5, the hitting sound has 135 points, With a flight distance of 118 points, a directivity of 117 points, and a total point of 370 points, the ball sound is improved, which is advantageous in comparison with the embodiment 29 in securing the directivity and the flight distance.
On the other hand, the height H2 of the high part of claim 5 / the height H2 of the sole rib portion 28C is 2.4, and the experimental example 28 in the range of 1.5 to 2.5 has a hitting sound of 165 points and a flight distance. 147 points, directionality is 148 points, and the total number is 460 points, which is more advantageous than Examples 26 and 27 in terms of improving the ball sound and ensuring the directionality and flight distance.
This provides a good balance of the arrangement of the toe side rib portion 28A, the heel side rib portion 28B, and the sole rib portion 28C, which is advantageous in suppressing the mass of the rib 28 while increasing the rigidity of the sole portion 16 and the side portions 18 and 20. This is because.

From the above, it can be seen that the experimental examples within the scope of the present invention are superior in all of the directivity, flight distance, durability, and total points as compared with the experimental examples outside the scope of the present invention.
Further, in contrast to the experimental example satisfying only the range defined in claim 1, the experimental example further satisfying the range defined in claims 2 to 5 is any one of hitting sound, directionality, flight distance, durability, and total point. It can be seen that this is even better.

  DESCRIPTION OF SYMBOLS 10 ... Golf club head, 12 ... Face part, 12A ... Face surface, 14 ... Crown part, 16 ... Sole part, 18 ... Toe side part, 20 ... Heel side part, 28 ... Rib, 28A ... Toe side rib, 28B ... Heel side rib, 28C ... Sole rib, 2802, 2804 ... High part, Pr ... Reference plane, PG ... Head cross section contour, PGmax ... Head maximum cross section Contour line, Xt: Toe side intersection, Xh: Heel side intersection, P0: Virtual plane, L0: Virtual straight line, I: Projected contour line, Pc: Center point of face surface 12A, Pb: Golf Locations located at the rearmost side of the club head 10, L01 to L05... First to fifth straight lines, Px, Py... Protruding points, Pxy.

Claims (4)

A face portion having a top and bottom height and forming a face surface extending left and right, a crown portion extending rearward from the upper portion of the face portion, and a sole portion extending rearward from the lower portion of the face portion And a toe side side portion that extends rearward from the toe side end portion of the face portion and connects the crown portion and the sole portion, and extends rearward from a heel side end portion of the face portion, A golf club head having a hollow structure that includes a heel side part connected to the toe side part while connecting the crown part and the sole part,
In the reference state in which the golf club head is installed at a predetermined lie angle with respect to the reference surface and the face angle is set to 0 °,
A plane including the shaft center axis of the golf club head and orthogonal to the reference plane is defined as a virtual plane P0.
A contour outside the cross section of the golf club head broken at the virtual plane P0 is a head cross sectional contour.
A straight line that intersects the head cross-sectional contour line at two locations and extends in parallel with the reference plane Pr on the virtual plane P0 is defined as a virtual line L0.
Of the two intersections where the virtual straight line L0 intersects the head cross-sectional outline, the intersection located on the toe side is defined as a toe side intersection Xt, and the intersection located on the heel side is defined as a heel side intersection Xh.
When moving the virtual plane P0 in the face-back direction and moving the virtual straight line L0 in the direction perpendicular to the virtual straight line L0 on the virtual plane P0,
The head cross-sectional contour line when the distance between the toe side crossing point Xt and the heel side crossing point Xh is the maximum is the head maximum cross-sectional contour line,
In the head maximum cross-sectional contour line,
The toe side intersection Xt is point A,
Of the two intersections of the virtual plane parallel to the reference plane at a position spaced 10 mm below the point A and the head maximum cross-sectional contour line, the intersection on the toe side is the point B,
Of the two intersections of the virtual plane parallel to the reference plane at a position spaced 20 mm below the point A and the maximum cross-sectional contour of the head, the intersection on the toe side is the point C,
The length of the straight line projected on the reference plane that connects the point A and the point B is more than 0 mm and 3 mm or less,
The length of a straight line projected on the reference plane connecting the point A and the point C is more than 0 mm and not more than 9 mm,
The inner surface of the sole portion extends in the toe heel direction, and is connected to the inner surface of the toe side side portion and the inner surface of the crown portion on the inner surface of the toe side side portion, and on the inner surface of the heel side side portion, Ribs connected to the inner surface of the heel side portion and the inner surface of the crown portion are provided,
The height of the rib is 4 mm or more and 10 mm or less,
The thickness of the rib is 0.5 mm or more and 1.5 mm or less,
When the golf club head is viewed in plan, the rib extends along a curve that is convex toward the face portion,
The length of the component in the front-rear direction of the golf club head, which is a straight line that projects a straight line connecting the center point of the face surface and the position located at the rearmost position of the golf club head, is defined as a head length Wfb.
On the reference plane, a first straight line connecting a point obtained by projecting the toe side intersection point Xt and the heel side intersection point Xh located on the maximum cross-sectional contour of the head onto the reference plane is a direction orthogonal to the toe heel direction. The straight line moved 0.2 Wfb in front of the golf club head is the second straight line,
When the straight line spaced apart 0.4 Wfb behind the golf club head in the direction perpendicular to the toe heel direction on the reference plane is defined as a third straight line,
An outline of the rib projected on the reference plane is located within a range between the second straight line and the third straight line ;
In the reference state, a projected point that protrudes most to the toe side in the toe heel direction among the projected contour lines obtained by projecting the contour line outside the cross section of the golf club head fractured on a virtual plane parallel to the reference plane on the reference plane. A fourth straight line extending in the front-rear direction of the street golf club head;
When the intersection point of the projected contour line intersects with a fifth straight line extending in the toe heel direction through a protruding point that protrudes most rearward of the golf club head in the front-rear direction of the golf club head,
The projected contour is located outside the range of 20 mm from the intersection;
The volume of the golf club head is 400 to 470 cc, the head mass of the golf club head is 160 to 190 g, and the moment of inertia around the vertical line passing through the center of gravity of the golf club head is represented by the head mass. The divided ratio is 25-30,
A golf club head characterized by that. The club length of the golf club to which the golf club head is attached is 46.0 to 48.0 inches.
The golf club head according to claim 1 . The metal usage ratio of the sole portion is 80 to 100%.
3. The golf club head according to claim 1, wherein The rib includes a toe side rib portion located on the inner surface of the toe side side portion, a heel side rib portion located on the inner surface of the heel side side portion, and a sole rib portion located on the inner surface of the sole portion,
The sole rib portion has a constant height from the inner surface of the sole portion,
The toe side rib part has a high portion whose dimension from the inner surface of the toe side part is larger than the height of the sole rib part,
The heel side rib portion has a high portion whose dimension from the inner surface of the heel side side portion is larger than the height of the sole rib portion,
The height of those high parts is 1.5 to 2.5 times the height of the sole rib part,
The golf club head according to any one of claims 1 to 3 , wherein the golf club head is any one of the above.

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