JP7181852B2 - Golf club head and golf club - Google Patents

Description

The present invention relates to golf clubs, and more particularly to golf club heads suitable for iron-type golf clubs.

Usually, the head of an iron-type golf club is formed by integrally forming a face portion on which a ball is hit with the head body, or integrating a face member separate from the head body with the head body by bonding, welding, caulking, or the like. known to do. In such a head, it is known to form grooves on the back surface of the face portion (hereinafter referred to as a face member separate from the head body) in order to facilitate bending of the face portion and improve flight distance. ing. That is, by forming the groove, the rigidity of the groove portion is lowered, so that the flexibility of the face portion can be improved.

For example, Patent Document 1 discloses a configuration in which long grooves are formed along the toe-heel direction on the top side and the sole side of the back surface of the face portion. Normally, in a flat face portion where no grooves are formed, the geometric center position (also called face center FC) is the most flexible region. It is possible to make the geometric center position more flexible. That is, by increasing the deflection amount of the geometric center region of the face portion, the repulsive force at the time of hitting the ball is increased, and the flight distance can be improved.

However, with iron-type golf clubs, the ball is hit from the ground without teing up in most cases, and the actual hitting position is below the geometric center position. Specifically, the height of the geometric center position is about 20 mm from the ground contact surface (leading edge) of the head, while the actual height of the hitting position is about 15 mm from the contact surface of the head. However, the groove structure described above does not sufficiently improve the resilience at the actual hitting position. That is, it is desirable that the position where it is desired to improve the resilience (to greatly bend the face portion) be at a position approximately 15 mm from the ground contact surface of the head. In consideration of this point, for example, Patent Document 2 discloses a configuration in which a plurality of grooves are formed in the lower region of the back surface of the face portion so as to be parallel to the score lines to reduce the rigidity of the lower region. ing. A plurality of grooves formed on the back surface of the face portion are provided corresponding to the regions (strip-shaped regions) between the scorelines, and each groove is a connecting groove extending in a direction intersecting the extending direction of the grooves. connected by

Patent No. 5537382 Patent No. 6347305

As described above, by forming grooves on the back surface of the face portion, it is possible to improve flexibility without increasing the weight of the face portion. It is effective to form grooves in the lower region to lower the rigidity and increase the amount of bending of the lower region.
However, if grooves are formed in the actual hitting area, the strength is directly reduced, and the thickness of the face portion cannot be reduced, which is not effective in improving the flexibility. In addition, if grooves are formed in the portion where the ball is hit, the ball will be crushed at impact and the soft feel of hitting the face will be reduced (hit feel will be reduced).

The present invention was made with a focus on the above-mentioned problems, and efficiently improves the flexibility without lowering the durability in the vicinity of the position where the ball is actually hit, and furthermore, affects the feel performance. It is an object of the present invention to provide a golf club head and a golf club that do not give a

To achieve the above object, the present invention provides a golf club head having a face portion having a ball-striking surface on which scorelines are formed, and a thin thick portion formed on the back surface of the face portion. Assuming that the hitting position C is defined by a position 15 mm high from the leading edge on a perpendicular line passing through the geometric center position of the part, it is defined within a radius of 10 mm centered on the hitting position C. The thin thick portion is formed so as not to include the effective hitting area, and the thin thick portion has a toe side recess provided on the toe side and a heel side recess provided on the heel side with respect to the effective hitting area. The toe-side concave portion and the heel-side concave portion are formed in a region below a heel-side upper end position of the ball-striking surface of the face portion.

The face portion configured as described above has a toe-side concave portion and a heel-side concave portion formed on the back surface so as not to include an effective hitting area defined within a radius of 10 mm centered on the hitting position C. Flexibility (resilience) at the ball can be efficiently improved, and the flight distance of the hit ball can be improved. In particular, by forming the toe-side concave portion and the heel-side concave portion in a region below the heel-side upper end position of the ball-hitting surface of the face portion, it is possible to improve flexibility within a radius of 10 mm centered on the hitting point C. , the permissibility of hitting deviation (mis-hit) is improved, and the flight distance is not greatly reduced. Furthermore, since no recess is formed in the effective hitting area where the ball is actually hit, durability and hitting feel at the hitting portion are not lowered, and the resilience performance can be efficiently improved.

In the configuration described above, the ball-hitting surface means the area where the score lines are formed on the surface of the face portion. It means an area within a certain range considering In other words, the golfer swings to hit the hit position C, but there is variation from the hit position C, and the present invention is designed to improve the flexibility of this variation region. In the present invention, the ball hit by an ordinary golfer is verified, and the effective hitting area is within a radius of 10 mm centered on the actual accurate hitting position (hitting position defined by the position where the height from the leading edge is 15 mm) C. and the resilience is improved within this range.

In addition, at least in the effective hitting area, there is no thin thick portion (concave portion) with low rigidity for improving resilience, so durability and hitting feel are not lowered at the hitting portion. Further, the toe-side concave portion and the heel-side concave portion only need to have low rigidity so that the central region of the face portion below the geometric center position (face center) of the face portion can be easily bent. It can be composed of a groove, a recess of a certain range, or a combination of these, and its shape, depth, etc. can be appropriately modified.
Furthermore, the head having the face structure described above can be attached to an iron-type golf club and applied regardless of the club number.

According to the present invention, it is possible to obtain a golf club head and a golf club that efficiently improve the flexibility without deteriorating the durability in the vicinity of the position where the ball is actually hit, and that do not affect the performance of hitting feeling. .

1 is a front view of a head, showing a first embodiment of a golf club head according to the present invention; FIG. (a) is a cross-sectional view of the head shown in FIG. 1 taken along line II(a)-II(a), and (b) is taken along line II(b)-II(b) of the head shown in FIG. cross section. FIG. 4 is a view of the head according to the first embodiment as seen from the back side; FIG. 10 is a diagram showing a second embodiment of the present invention, and is a diagram of the head viewed from the back side; (a) to (c) are diagrams showing third to fifth embodiments of the present invention, respectively, and are rear views of the face portion. (a) to (c) are diagrams showing sixth to eighth embodiments of the present invention, respectively, and are rear views of the face portion. (a) to (c) are diagrams showing ninth to eleventh embodiments of the present invention, respectively, and are rear views of the face portion. (a) and (b) are diagrams showing twelfth and thirteenth embodiments of the present invention, respectively, and are rear views of the face portion.

An embodiment of an iron-type golf club head (hereinafter referred to as a head) according to the present invention will be specifically described below with reference to the accompanying drawings.
1 to 3 are diagrams showing a first embodiment of the present invention, FIG. 1 is a front view of the head, and FIG. a) a cross-sectional view along the line, FIG. 2(b) is a cross-sectional view along the II(b)-II(b) line of the head shown in FIG. 1, and FIG. It is a diagram.

The golf club to which the head according to the present embodiment is attached is of the iron type. It is configured by fitting and fixing to 1B. The shaft and the head body 1A are set so that when the golf club is held with respect to the reference horizontal plane P, the axis X of the fixed shaft and the reference horizontal plane P form a predetermined lie angle α. In this case, the shaft may be made of steel or fiber reinforced resin (FRP).

A face portion 5 for hitting a ball is formed integrally with the head body 1A. The face portion 5 is formed in a plate shape, and includes a face surface 5a on which a ball is hit on the front side, and a back surface 5b on which a thin thick portion (recess) described later is formed. The face surface 5a is formed to have a predetermined loft angle β depending on the number.

The head main body 1A integrally formed with the face portion 5 can be integrally formed by casting using a metallic material such as titanium, titanium alloy, stainless steel, carbon steel, tungsten, etc. , a top portion 1a, a sole portion 1b, a toe portion 1c, and a heel portion 1d. In this case, the face portion 5 is formed of a plate-like member separate from the head main body (for example, integrally formed by casting using a metal material such as titanium, titanium alloy, stainless steel, carbon steel, or tungsten). Alternatively, for example, the head body 1A may be formed in a ring shape, and a separate face member may be attached to the opening by caulking, welding, or adhesion. Also, the end portion of the face portion 5 may constitute a part of the top portion, the sole portion, or the like of the head body.

As described above, the head body 1A has a top portion 1a, a sole portion 1b, a toe portion 1c and a heel portion 1d. there is In this embodiment, the top portion 1a extends to the back side and is bent so that the tip side thereof hangs down, and the sole portion 1b extends rearward, and the tip portion thereof is provided on the back side. A back member 1f that rises upward while extending vertically is integrated by welding or the like. The tip of the back member 1f rises to approximately the middle position between the toe portion 1c and the heel portion 1d. It is possible to lower the center of gravity. The back member 1f may be formed integrally with the head main body, or may be configured to attach a weight member separately.

Similarly, the toe portion 1c and the heel portion 1d also extend toward the back and the tip ends thereof are bent toward the center. This improves the flexibility of the face as a whole.

The head main body 1A has a shape whose height increases as it shifts from the heel side to the toe side. A plurality of lines 7 are formed so as to be parallel. In the present invention, the region R on which the scorelines 7 are formed is defined as the ball-hitting surface of the face portion 5 . The ball-striking surface R is formed, for example, by applying masking to the outside of the toe-side edge Ra and the heel-side edge Rb, and performing surface roughening treatment such as sandblasting.

The face portion 5 has a geometric center position (face center) FC within the ball hitting surface R. As shown in FIG. When the player hits the ball, in the toe-heel direction, the ball is hit near the vertical line passing through the geometric center position FC (the player hits the ball with this point in mind). The actual hitting position in the direction is below the geometric center position FC. Specifically, the height H is the position where the sole portion 1b of the head body moves along the ground and the ball is hit when the ball is placed on the ground, and is the leading edge LE of the sole portion 1b. It is around 15 mm from. This position is a position (ideal hitting position) where a ball is hit without so-called top or duffling in an iron-type golf club, and this position is defined as a hitting position C. The hitting position C is generally located near the fourth point from the bottom of the score line 7, although it depends on the type of club, and the golfer normally swings to hit the ball near the hitting position.
Note that the geometric center position FC and hitting position C are shown on the back surface of the face portion shown in FIG. The FC coincides with the hitting position C.

Since the rear side of the face portion 5 has a cavity structure as described above, the entire face portion can be bent, and the most flexible position is near the geometric center FC. However, as described above, this position does not match the hitting point C where the ball is actually hit. In reality, when viewed from the top-sole direction, the face portion 5 is short on the heel side and lengthens toward the toe side. , is considered to be slightly on the toe side of the geometric center position FC.

When a ball is hit with an iron club having the above-described head, the ball is hit in the vicinity of the hitting point C. When an average golfer (ordinary golfer) hits 100 balls, the hit mark is examined, and the height direction is as follows. , almost all of the balls are hit at a height of 25 mm or less from the leading edge LE (this height is within 6 scorelines 7). In addition, in the toe-heel direction, most of the balls were hit within a range of 10 mm to the toe side and heel side of the hit point C (the trace of hitting outside 10 mm). was also slightly seen).

In the present invention, based on the verification results described above, the effective hitting area R1 is defined as the area where a normal golfer hits a ball within the ball hitting surface R, and the effective hitting area R1 is effectively deflected. , a concave portion, which is a thin and thick portion that reduces rigidity, is formed on the back surface of the face portion 5 . Specifically, in the present invention, the effective hitting area R1 is defined as an area within a radius of 10 mm centered on the hitting position C (circular area surrounded by a dotted line). A thin thick portion (concave portion) having low rigidity is formed outside the hitting area (not including the effective hitting area) so as to effectively bend the effective hitting area R1.

The recessed portion that becomes the thin-walled portion has a toe-side recessed portion 21 provided on the toe side and a heel-side recessed portion 22 provided on the heel side with respect to the effective hitting area R1, and the rigidity of these portions is low. Therefore, it is possible to easily bend the effective hitting area R1 inside both recesses. In this case, considering the geometric shape of the face portion, the portion that is most flexible is near the geometric center position FC as described above. If it is formed at a position higher than , the easily flexible region shifts upward, making it impossible to effectively bend the effective hitting region R1. That is, the toe-side recessed portion 21 and the heel-side recessed portion 22, which are low-rigidity portions, are formed so that the lower region of the face portion, specifically, at least the ball-hitting surface R of the face portion 5, is increased so that the effective hitting region R1 is easily flexed. is formed in a region below the heel-side upper end position Pr, and further preferably below the geometric center position FC. Further, the depth D of the concave portion for reducing rigidity is preferably 30% or less of the wall thickness T of the face portion, because if the depth is too deep, the strength of the face portion is lowered.

The toe-side concave portion 21 and the heel-side concave portion 22 of this embodiment, as shown in FIG. 21a, 21b, 21c and 22a, 22b, 22c. That is, each groove is formed below the geometric center position FC, and the grooves 21a, 21b, and 21c are parallel while curving from the central position on the toe side toward the central position on the sole side. The grooves 22a, 22b, 22c are formed so as to be parallel while curving from the central position on the heel side toward the central position on the sole side. In this way, by forming three grooves, respectively, it is possible to efficiently reduce the rigidity, and by forming the toe side and the heel side in a substantially symmetrical shape, the effective hitting area R1 is substantially uniform and effective. It is possible to bend it.

In this embodiment, the toe-side concave portion 21 and the heel-side concave portion 22 are arranged not only within the range of the above-described effective hitting area R1, but also in consideration of fluctuations in the hitting points in the toe-heel direction (larger fluctuations). centered on the hit point C, 15 mm outside the toe side (outside the position indicated by symbol Rt) and 15 mm outside the heel side (outside the position indicated by symbol Rh). He is trying to bend effectively the substantially elliptical region R2 wider than the effective hitting region R1. That is, by forming the toe-side recessed portion 21 and the heel-side recessed portion 22 at positions that do not include the region R2, the elliptical region R2 that is wider than the effective hitting region R1 is effectively formed without causing a decrease in hitting feel or strength. Therefore, even if the hitting position is slightly different in the toe-heel direction, it is possible to suppress the decrease in flight distance.

The face portion 5 configured as described above has a toe-side recessed portion 21 and a heel-side recessed portion 22 formed on its rear surface so as not to include an effective hitting area R1 defined within a radius of 10 mm around the hitting position C. , the flexibility (resilience) in the effective hitting area can be efficiently improved, and the flight distance of the hit ball can be improved. In addition, by improving the flexibility within a radius of 10 mm centered on the hitting position C, the tolerance for hitting deviation (mis-hit) is improved, and the flight distance is not greatly reduced. In particular, in the present embodiment, since the formation positions of the respective grooves are shifted toward the toe side and the sole side by 15 mm or more from the hitting position C, the tolerance for miss shots is increased. In addition, since no concave portion is formed in the effective hitting area R1 where the ball is actually hit, the durability and hitting feel at the hitting portion are not lowered, and the resilience performance can be efficiently improved. Also, if a player misses a shot and hits the ball at the part where the recess is formed, the missed shot can be sensed.

Here, recesses (three curved grooves 21a, 21b, 21c formed on the toe side, and three curved grooves 22a formed on the heel side) as shown in FIG. , 22b, 22c) and a face portion having the same structure but without grooves will be explained while comparing the CT value distributions.
As for the deflection of the face, there is a method of measuring it according to the pendulum test of the USGA (United States Golf Association) as an index. It is possible to evaluate Specifically, the elasticity of the position of the face can be evaluated by measuring the contact time when a predetermined test piece collides with the face. ), it can be evaluated that the contact time with the face portion is long when the ball is hit, and the flexibility is good. That is, the higher the CT value, the easier it is for the face to flex, which improves the flight distance of the ball. means to be

In the face portion, the CT value can be derived according to the position of the face surface, and the magnitude of the CT value for each position and the overall distribution state can be obtained. Although the CT value depends on the material of the face portion, it largely depends on the thickness of the face portion and the distance from the edge region of the face portion. That is, by making the thickness thinner, the face portion itself is more likely to flex, and the region farthest from the edge region (geometric center position FC of the face portion) is more likely to flex more. The CT value near position FC is high.

In the present invention, as described above, the toe-side concave portion 21 and the heel-side concave portion 22, which are thin-walled portions, are formed on the toe side and the heel side so as not to include the effective hitting area R1. is lowered to improve the CT value of the hitting position C and the effective hitting area R1, which is the surrounding area.

Table 1 below shows the CT value distribution of a conventional face portion having no toe-side concave portion and heel-side concave portion, showing measured values and percentages. Table 1 shows the effective hitting area with a radius of 10 mm (height ranges from U5 to U25, toe (T) and heel (H ) direction is in the range of T10 to H10), showing the results of measuring the distribution of CT values in 5mm units, and furthermore, up to 20mm (T15, T20) on the toe side and up to 15mm (H15) on the heel side. It shows the measurement results. Note that measurement results for heel side 20 mm (H20) and height 5 mm (U5) are not shown because they are not suitable hitting balls such as so-called shanks or tops.

Table 2 below shows the same CT value distribution as Table 1 for the face portion according to the present invention, in which the toe-side concave portion 21 and the heel-side concave portion 22 are formed, as shown in FIG. is shown. The face portion obtained as a result of Table 2 has the same structure as the face portion of Table 1 except that the toe side recess 21 and the heel side recess 22 are formed.

The conventional face has a CT value of 224.0 μs at the hitting position C (15 mm height from the leading edge; indicated by U15), while the face of the present invention has a CT value of 247 μs. As a result, the flexibility at the hit point C where the ball is hit is improved. In addition, the CT values (measured values) in the effective hitting area of the face portion of the present invention are equal to or higher than those of the conventional face portion. As a result, the flexibility was improved, and the CT value was also increased at positions of 15 mm and 20 mm on the toe side and 15 mm on the heel side. Furthermore, in the areas of 10 mm (U10) and 15 mm (U15) in height, the CT values on the toe side and heel side with respect to the hitting position C did not decrease as much as in the conventional face. In the height range, a result was obtained in which the amount of change between the hitting position C was small. That is, a miss shot that does not greatly duff is often hit at a height equivalent to the hitting position C (or at a position slightly lower than that), but at this position, the CT value at the hitting position C is large. Since there is no decrease, it is possible to stabilize the flight distance even if a miss shot is made.

Actually, a trial hitting test was conducted with the iron type golf club having the above-described conventional face portion and the iron type golf club having the face portion of the present invention under the same conditions except for the grooves in the face portion. In the trial hitting test, a robot testing machine was used to obtain a performance evaluation when a ball was missed (a ball was hit at a position deviated from the hitting point C) within the range that an ordinary golfer would be able to hit. With the same setting, the hitting position was changed, four balls were hit at each position, and the average value was obtained. There are four hitting positions: the hitting position C, 5 mm below the hitting position C, 10 mm on the toe side from the hitting position C, and 10 mm on the heel side from the hitting position C.

As for the flight distance, the golf club having the face portion of the present invention was improved by about 5 yards as compared with the conventional golf club in terms of overall average value. In addition, in the lateral direction, in the present invention, the variation is within a range of about 3 yards from the center line (target direction), whereas in the golf club having a conventional face portion, the variation is within a range of about 5 yards. , a result with stable directionality was obtained.

As shown in Tables 1 and 2, the present invention is better than the conventional one at any of the hitting position C, 5 mm below the hitting position C, 10 mm on the toe side from the hitting position C, and 10 mm on the heel side from the hitting position C. Since the CT value is also high, it is considered that the flight distance as a whole was improved. In addition, it is considered that the reason why the directionality is stable with little variation in the left-right direction is as follows.
Wood-type golf clubs such as drivers have a bulge (roundness in the toe-heel direction) on the face surface, which produces a so-called gear effect. It is considered that a gear effect of This gear effect is that when the ball is hit at a point away from the center of gravity of the head, a moment is generated around the center of gravity, and the ball hits on the toe side hits to the right of the center line, and when hit on the heel side hits to the left of the center line. becomes. In such a launch direction, the gear effect works, a draw rotation acts on the ball when hit on the toe side, and a fade rotation acts on the ball when hit on the heel side, and the ball tries to return to the centerline direction. As described above, in the present invention, since the CT value is improved in the effective hit area, the flight distance performance is improved compared to the conventional one even if the hit point is blurred (the landing position of the hit ball is extended). It is considered that the effect works sufficiently and the hit ball tends to return to the center.

Another embodiment of the present invention will now be described.
In the following embodiments, configuration examples in which the shape of the concave portion formed on the back surface of the face portion is modified are shown, and only the back surface of the face portion is shown. Also, the same reference numerals are given to the same components as in the above-described embodiment, and detailed description thereof is omitted.

FIG. 4 is a diagram showing a second embodiment of the present invention.
In the configuration of the above-described embodiment, by forming the concave portion on the back surface of the face portion, the flexibility of the effective hitting area is efficiently improved without increasing the weight of the face portion. A rib may also be formed, and by forming the rib, it is possible to further improve the flexibility of the effective hitting area.
For example, as shown in FIG. 4, by forming a rib 25 along the toe-heel direction above the effective hit area R1, the rigidity of the peripheral portion is increased, and the increased portion and the sole portion 1b are formed. It is also possible to improve the flexibility in the effective hitting area R1 by making it easier to bend between. As for the ribs, besides forming them continuously in the toe-to-heel direction, it is possible to form them partially or to form a plurality of them, and to appropriately change their shape, formation position, and the like.

5(a) to (c) are diagrams showing third to fifth embodiments of the present invention.
The toe-side concave portion 21 and the heel-side concave portion 22 of the above-described embodiment are each formed of three curved thin grooves, but as shown in FIG . The groove widths of the curved grooves 31a, 31b, 31c and the curved grooves 32a, 32b, 32c may be widened. By widening the groove width in this way, it becomes possible to lower the rigidity in that region and improve the flexibility in the effective hitting region R1. In this case, each groove constituting the toe-side concave portion 31 and the heel-side concave portion 32 is deepened or widened as it moves outward, thereby lowering the rigidity of the peripheral region. It is possible to greatly bend the vicinity of the hit point C, which is the point where the ball hits the ball, so that the flight distance can be further improved.

Also, when grooves are formed as recesses, depending on the width of the grooves, as shown in FIGS . An improved effect is obtained. Furthermore, the shape of the grooves can also be modified as appropriate, such as by curving along the vertical direction, as shown in FIG. 5 (c).

6A to 6C are diagrams showing sixth to eighth embodiments of the present invention.
In each embodiment shown in FIG. 5, the grooves forming the toe-side recessed portion 31 and the heel-side recessed portion 32 are curved, but the grooves 41a, 41b, and 41c forming the toe-side recessed portion 41 and the heel-side recessed portion 42 are curved. The grooves 42a, 42b, and 42c may be curved as shown in FIG. 6 (a), or formed linearly in the vertical direction as shown in FIGS. 6 (b) and 6(c). , may be formed linearly in the direction of inclination.

FIGS. 7A to 7C are diagrams showing ninth to eleventh embodiments of the present invention.
As shown in FIG. 7A , the grooves 51a, 51b, 51c and the grooves 52a, 52b, 52c forming the toe side recess 51 and the heel side recess 52 may be formed along the horizontal direction. Alternatively, horizontal grooves 52a, 52b, 52c and a vertical groove 52d may be combined as in the heel-side concave portion 52 of FIG. 7 (b). Alternatively, like the toe-side concave portion 51, substantially horizontal grooves 51a and 51b and a curved groove 51c may be combined. Furthermore, as shown in FIG. 7 (c), curved grooves 51a and 52a extending in the vertical direction are combined with recesses 51b and 52b that are recessed in a certain range, or these are connected by grooves 51c and 52c. Such a structure may be used.

FIGS. 8A and 8B are diagrams showing twelfth and thirteenth embodiments of the present invention.
As shown in FIG. 8 (a), the toe-side recess 61 and the heel-side recess 62 may be configured by recesses 61a and 62a that are recessed within a certain range. In this case, by increasing the depth of each recess as it moves outward, it is possible to greatly flex the vicinity of the hitting point C, which is the center, and it is possible to further improve the flight distance. .
Further, as shown in FIG. 8B , the toe-side recess 71 and the heel-side recess 72 may be configured by forming a large number of circular recesses 71a and 72a. In this case, by increasing the number of depressions or increasing the depth of the depressions as they move outward, it is possible to greatly flex the vicinity of the hitting point C, which is the center, as in the configuration of FIG. 8 (a). becomes.

The iron-type golf club and its head according to the present invention have been described above. It is characterized by providing a thin thick portion (concave portion) to reduce rigidity on the face surface so as to make R1 easy to bend. The configurations of the toe-side recess and the heel-side recess, which are the recesses described above, are examples, and the shapes thereof can be appropriately modified. In this case, by changing the depth, size (width and length), and formation position, the flexibility of the effective hitting area R1 can be appropriately changed. For example, the concave portion that constitutes the thin thickness portion may be appropriately modified in its configuration and formation position, such as by thinning a certain range in the region other than the effective hitting region R1, forming a groove shape, or combining these. is possible. In addition, as in the above-described embodiment, the effective hitting area R1 may be formed on the toe side and the heel side, or depending on the case, the shape may be positioned above or below the effective hitting area R1. can be

1 Head 1A Head main body 5 Face portion 7 Scorelines 21, 31, 41, 51, 61, 71 Toe-side recesses 22, 32, 42, 52, 62, 72 Heel-side recesses FC Geometric center position C Hitting point R Hitting ball Surface R1 Effective hitting area

Claims (8)

A golf club head having a face portion having a ball-striking surface on which scorelines are formed, and a thin thick portion formed on the back surface of the face portion,
If C is the hitting position defined by a position 15 mm high from the leading edge on a perpendicular line passing through the geometric center position of the face portion, it is defined within a radius of 10 mm centered on the hitting position C. forming the thin thick portion so as not to include the effective hitting area where
The thin thick portion has a toe-side concave portion provided on the toe side and a heel-side concave portion provided on the heel side with respect to the effective hitting area, and the toe-side concave portion and the heel-side concave portion are provided on the hitting surface of the face portion. A golf club head characterized by being formed in a region below a heel-side upper end position of a surface. 2. The toe-side concave portion and the heel-side concave portion are formed, with the hitting point C as the center, 15 mm outward from the toe side and 15 mm outward from the heel side. golf club head. 3. The golf club head according to claim 1, wherein the toe-side recess and the heel-side recess are formed in a region below a geometric center position of the face portion. 4. The golf club head according to any one of claims 1 to 3, wherein each of the toe side recess and the heel side recess has two or more grooves. 5. The golf club head according to any one of claims 1 to 4, wherein the toe-side recess and the heel-side recess are formed in substantially symmetrical shapes. 6. The toe-side concave portion and the heel-side concave portion according to any one of claims 1 to 5, wherein the rigidity of the toe-side concave portion and the heel-side concave portion is reduced as they move outward toward the toe side and heel side, respectively. golf club head. 7. The golf club according to any one of claims 1 to 6, wherein ribs are formed along the toe-heel direction above the effective hitting area on the back surface of the face portion. head. An iron-type golf club comprising the golf club head according to any one of claims 1 to 7.

Images