JP3045653B2 - Golf club head - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a golf club head score line, and
The present invention relates to a golf club head having an effect of suppressing a decrease in the flight distance of a ball even when the ball is hit with a hit position shifted to the toe side or the heel side on the hitting surface.

[0002]

2. Description of the Related Art In golf, an important factor affecting the flight distance of a ball is the amount of back spin imparted to the ball at the time of hitting the ball. Therefore, various techniques for controlling the amount of spin have been disclosed. For example, Japanese Patent Application Laid-Open No. Sho 62-144677 discloses a golf club head in which the surface roughness of a hitting surface is adjusted by shot blasting to change the coefficient of friction with respect to a ball. Japanese Patent Publication No. 21505/1992 discloses a method of manufacturing a golf club set in which the coefficient of friction of the ball striking surface changes with a change in the number. 4-2
No. 677 discloses an iron golf club set in which the cross-sectional shape of the groove provided in the hitting surface is an equilateral trapezoidal shape, and the angle formed by the opposing wall of the groove and the hitting surface is changed for each golf club number. . JP-A-51-59666 describes:
A golf club head is disclosed in which the interval between score lines engraved on the face surface is narrow near the sweet spot and the other portions are wide. Also, Japanese Patent Publication No. 5-23154 is characterized in that shot blasting is applied to the striking surface so that the friction coefficient in the region from the toe and the region from the heel of the striking surface is larger than the friction coefficient in the intermediate region. Is described.

[0003]

In many of the techniques disclosed in the prior art, as seen in the above-mentioned prior art, a predetermined process is applied to the ball striking surface of a golf club of a specific number. Only on the same striking surface,
Techniques that change the processing state were rare. That is, the golf club described in Japanese Utility Model Publication No.
Although the angle formed by the opposing wall of the groove provided on the ball striking surface and the ball striking surface is changed for each golf club number, the angle is limited to a predetermined angle when looking at a specific golf club number. The angles of the grooves provided in the same striking surface are constant without change, and the coefficient of friction is also constant.

[0004] Of the other prior art described above,
The same can be said for the technology disclosed in Japanese Patent No. 44674 and Japanese Patent Publication No. 4-2505. Therefore, when these golf clubs were used, the friction coefficient of the striking face varied relatively between different iron numbers, and a trajectory corresponding to the characteristics of the club, such as a long iron, a middle iron, and a short iron, could be obtained. However, when the same club is used and a ball is hit at the center of the ball striking surface, a predetermined pop-out angle and back spin amount can be obtained, but when the ball is hit in the toe side area, the pop-out angle increases and conversely, the heel When the ball is hit in the side area, the pop-out angle decreases.
Therefore, even if the club is the same, the launch angle changes due to the difference in the hitting position, but the backspin amount was always almost constant, leading to a decrease in the flight distance and unstable directionality. There was a problem.

On the other hand, the golf club head described in Japanese Utility Model Laid-Open Publication No. 51-59666 can provide a proper backspin amount when hitting near a specific numbered sweet spot, but the toe side does not. When the ball is hit from the heel side or the heel side, an appropriate amount of back spin cannot be obtained, and there is a problem that the flight distance varies.

On the other hand, the iron club head described in Japanese Patent Publication No. 5-23154 has a ball striking surface such that the friction coefficient between the toe region and the heel region of the ball striking surface is larger than the friction coefficient in the intermediate region. By applying shot blasting to the ball, it is possible to obtain a ball trajectory with good directionality and extend the flight distance even if it hits at a position deviating from the sweet spot of the ball striking surface There is a description. However, it is difficult to change the amount of spin given to the ball with shot blasting, and it is difficult to change the surface roughness along a certain boundary in manufacturing, and it requires a complicated process. There was a problem that it had to be done. In addition, there is also a problem that the shot blasting surface is subject to rapid wear, and the friction coefficient changes with use.

In view of the above problems, according to the present invention, when the hitting position deviates to the toe side or the heel side at the time of hitting, an optimum spin amount is given to the ball, and a decrease in flight distance can be suppressed to maintain an optimum trajectory. It is an object to provide a golf club head.

[0008]

In the iron golf club set according to the present invention, the ball striking surface of the golf club head is divided into three regions of a toe side region, a center region, and a heel side region, and each region has a horizontal direction. the number of score lines provided in parallel, each with a golf club increases as proceeds to the heel side region from the toe side region, hitting
The pitch between the score lines provided in each area of the surface
14mm-20mm in the toe side area, and in the center area
Is 7mm to 14mm, 4mm to 7mm in the heel side area
Is most desirable.

In this case, the hitting surface of the golf club head is
Divided into three areas: toe side area, center area, and heel side area
Split, radially open from the heel side to the toe side
The number of score lines provided is from the toe side area to the heel
The golf club head increases as one moves to the side region
, Between the score lines provided in each area of the ball striking surface
Pitch is 14 mm to 20 m in the toe side area, respectively.
m, 7 mm to 14 mm in the central area, and in the heel side area
Most preferably, it is 4 mm to 7 mm. In the golf club head, it is also possible to replace a part of the score line provided on the hitting surface with a dot.

[0010]

When the golf club head according to the present invention is hit near the center of the ball striking surface, it can provide the ball with a predetermined launch angle and a back spin corresponding to the loft angle. In addition, when the ball is hit on the toe side of the ball hitting surface, the head rotates in the anti-flying direction due to the impact of the hit ball, that is, the head rotates in the so-called opening direction, and the loft angle becomes relatively large, so that the ball projection angle becomes large. . However, since the score line in the toe side region is relatively smaller than that in the central region, the amount of back spin applied to the ball is reduced, and the trajectory is prevented from becoming too high. On the other hand, when the ball is hit on the heel side of the ball hitting surface, the head rotates in the flying direction, that is, the direction in which the head is covered by the impact of the ball hitting, and the loft angle becomes relatively small. However, since the heel side region has a relatively large score line as compared with the central region, the backspin amount given to the ball is increased, and the trajectory is prevented from being too low.

In general, the backspin amount increases when the interval between score lines is made smaller, and conversely, the backspin amount decreases when the interval between score lines is made coarser. The pitch between score lines of the golf club head according to the present invention is 14 mm to 20 mm in the toe side region, and 7 mm to 1 mm in the central region.
By setting it to 4 mm and 4 mm to 7 mm in the heel side region, it is possible to provide a back spin amount that appropriately offsets the increase or decrease in the ball's pop-out angle due to the increase or decrease in the loft angle due to the difference in the ball hitting position. Can be kept small.

Since the score lines of the golf club head according to the present invention are provided in a radial shape that opens from the heel side to the toe side, each region is compared with the case where the score lines are provided in parallel. The difference between the pitches of the score lines near the boundary can be reduced, and the amount of change in the backspin amount when the ball is hit at the boundary can be reduced.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One preferred embodiment of a golf club head according to the present invention will be described with reference to the drawings. 1 to 4
FIG. 1 is a front view of a ball striking surface 1 of a golf club head according to the present invention. FIG. 1 shows score lines 2 provided in parallel with each other, and FIG. FIG. 3 shows that the score line 2 is provided with a line segment cut off in the middle, and FIG. 4 shows that the score line 2 is partially replaced by a dot 3.

The golf club head according to the present invention can be made of a metal material such as stainless steel, titanium or aluminum, a carbon fiber reinforced plastic, a synthetic resin such as ABS or a thermoplastic synthetic resin kneaded with a reinforcing fiber, or natural wood. An iron club head A or a wood club head B formed by combining known materials or a combination of these materials. The shape of the club head body is not particularly limited, and may be a conventionally used shape, or may be a shape with appropriate changes and improvements.

The golf club head according to the present invention is particularly characterized in the form of the score line 2 provided on the hitting surface 1. That is, as shown in FIG. 1, the ball striking surface of the golf club head is divided into three regions of a toe-side region X, a center region Y, and a heel-side region Z, and a score line provided substantially horizontally in each region. The golf club head according to claim 1, wherein the number of the golf club heads increases as the number of the golf clubs increases from the toe side area to the heel side area. In this embodiment, the number of score lines 2 in each region is two in the toe side region X, three in the central region Y, and five in the heel side region Z.
It is provided in the book.

A method for determining the optimum pitch of the score line 2 for the present invention will be described below. Change the pitch of the score line to the normal wood club head and place 100
Table 1 shows the behavior of the ball when repeatedly hitting the ball. When considering the performance of a golf club, it is necessary to consider the absolute amount of backspin given to the ball and the variation in the absolute amount when hit repeatedly. In general, when the pitch of the score line is small, the dispersion is small, but the absolute amount of spin is increased, and as a result, the flight distance is reduced. Conversely, when the pitch increases, the spin amount decreases and the absolute value of the flight distance increases, but the dispersion of the flight distance increases. As shown in Table 1, the pitch of the score line is 1
In the case of 6 mm, the back spin amount is reduced to 2852 rpm and the flight distance is increased, but the variation of the back spin amount is as large as 580 in standard deviation (SD), and the error of the flight distance for each hit ball is large. As a result, it becomes difficult for the golfer to control the ball to the intended location. On the other hand, when the pitch of the score line is 4 mm, the variation of the backspin amount is reduced in standard deviation from 580 to 227 as compared with the case where the pitch is 16 mm, and the flight distance can be easily controlled. Increases from 2852 rpm to 3391 rpm, which results in a decrease in the absolute value of the flight distance. Therefore, if we balance the absolute value of the flight distance and the dispersion of the flight distance,
It is appropriate that the pitch of the score line is about 8 mm at least at the center of the hitting surface.

[0017]

[Table 1]

As described above, when the ball is hit with the center portion of the hitting surface removed, the head opens when hitting on the toe side, and the head hits when hitting on the heel side, so that the ball's projection angle changes. Table 2 shows the change of the projection angle and the flight distance at this time. That is, in a golf club having a score line pitch of 8 mm, when the ball is hit at the center of the ball striking surface, the standard launch angle is 10.4 °, the backspin amount is 3236 rpm, and the flight distance is 184 m. When the ball is hit to the toe side at a position of 12 mm, the pop-out angle is 10.8 °, the back spin amount is 2862 rpm, and the flight distance is reduced to 181 m. On the other hand, when the ball is hit at a position 12 mm from the center line to the heel side, the launch angle is 9.9 °, the backspin amount is 3694 rpm, and the flight distance is reduced to 178 m. In this way, when the ball hits off the toe side, the fly-out angle increases, so it is necessary to reduce the backspin amount to extend the flight distance, and conversely, the ball hitting position moves off the heel side In such a case, the pop-out angle becomes small, so it is necessary to increase the backspin amount.

[0019]

[Table 2]

Therefore, when the launch angle changes depending on the hitting position, it is necessary to adjust the backspin amount so that the flight distance is constant according to each launch angle. Table 3 shows the results of calculating the backspin amount for keeping the flight distance constant by using a method of simulating the flight distance of a hit ball by using the launch angle, the backspin amount, and the ball initial velocity as parameters. As shown in Table 3, it was assumed that the launch angles were 11.0 ° and 10.0 ° based on a flight distance of 184m when the launch angle when hitting the ball in the center region of the hitting surface was 10.5 °. In this case, when the backspin amount is calculated so that the ball has the maximum flight distance, it is 2800 rpm and 3250 r, respectively.
pm. Here, 2800 rpm and 3250 rpm
When the interval between score lines for obtaining the backspin amount is obtained from Table 1, it is found that they are about 16 mm and about 4 mm, respectively.

[0021]

[Table 3]

Table 4 shows the behavior of the ball when the hitting position is changed to the toe side area X, the center area Y, and the heel side area Z in the club according to the embodiment of the present invention. When this is compared with the conventional golf club shown in Table 2 in which the hitting position is changed in the same manner and the hitting is performed in the central region Y, the absolute value of the flying distance is reduced on the toe side based on the hitting in the central region Y. Region X
Is 0.5% and the heel side area Z is 2.1%.
It can be seen that they are respectively improved from 1.6% and 3.3%, which are the reduction rates of the flight distance of the conventional golf club.

[0023]

[Table 4]

Another embodiment of the golf club head according to the present invention is shown in FIG. The golf club head according to the present embodiment has a hitting surface 1 similar to the golf club head described above.
Is divided into a toe-side area X, a center area Y, and a heel-side area Z, and the pitch of the score line 2 becomes wider from the heel-side area Z to the toe-side area X. The score line 2 provided on the surface 1 is provided in a radial shape that opens from the heel side to the toe side. When the score line 2 is parallel as in the above-described embodiment, the score line 2 is formed at the boundary between the toe side region X and the central region Y adjacent thereto and the central region Y and the heel side region Z adjacent thereto. Since the pitch changes abruptly, when the ball is hit at the boundary portion, the variation in the amount of back spin applied to the ball increases, and the variation in the flight distance also increases.
Therefore, as in the present embodiment, the score line 2 of each area is
When provided radially from the heel side to the toe side,
The pitch near the center of each region is 4 to 7 mm in the heel side region Z, and 7 to 14 m in the central region Y.
In the toe side region X, the pitch is set to 14 to 20 mm, and the difference in pitch between the regions can be reduced, so that the amount of change in the backspin amount when the ball is hit at the boundary can be reduced.

As another embodiment, as shown in FIGS. 3 and 4, a part of the score line 2 can be deleted, changed to dots 3, or added. By deleting a part of the score line 2 or changing it to the dot 3 and adding it, fine adjustment of the back spin amount given to the ball becomes possible, and the controllability of the hit ball can be further improved.

[0026]

Since the golf club head according to the present invention is constructed as described above, the ball hits the ball with the center area of the ball struck out of the ball at the time of ball striking, and the ball striking angle increases or decreases due to the ball striking or opening. Even if it changes, an appropriate amount of backspin is given to the ball, so that the effect of reducing the decrease in the flight distance can be reduced as compared with the case where the ball is hit in the central region of the hitting surface.

Further, since the score line is provided in a radial shape that opens from the heel side to the toe side, it is possible to suppress the variation of the optimal back spin amount when hit at the boundary of each area. This makes it possible to reduce the variation in the flight distance.

Further, a part of the score line may be deleted,
By changing to dots or adding dots, fine adjustment of the backspin amount given to the ball becomes possible, and controllability of the hit ball can be further improved.

[Brief description of the drawings]

FIG. 1 is a view showing a hitting surface of a golf club according to the present invention.

FIG. 2 is a diagram showing a hitting surface of a golf club according to the present invention.

FIG. 3 is a view showing a hitting surface of a golf club according to the present invention.

FIG. 4 is a view showing a hitting surface of the golf club according to the present invention.

FIG. 5 is a view showing an embodiment of an iron club head according to the present invention.

FIG. 6 is a view showing an embodiment of a wood club head according to the present invention.

[Explanation of symbols]

 Reference Signs List 1 hitting surface 2 score line 3 dot A iron club head B wood club head X toe side area Y center area Z heel side area

Claims (3)

(57) [Claims] 1. The golf club head has a hitting surface on a toe side area.
Area, central area, and heel side area.
Provided in each area in parallel in the horizontal direction
The number of score lines moves from the toe side area to the heel side area.
Golf club heads
The pitch between the score lines provided in each area of the surface
14 mm to 20 mm in the toe side area, and in the center area
7mm ~ 14mm, 4mm ~ 7mm in the heel area
A golf club head characterized in that: 2. The hitting surface of a golf club head has a toe side area.
Area, central area, and heel side area.
It is provided in a radial shape that opens from the heel side to the toe side.
The number of score lines from the toe side area to the heel side area
The golf club head smell increases as it moves
Between the score lines provided in each area of the ball striking surface.
H is 14mm ~ 20mm in the toe side area, center
7mm ~ 14mm in the area, 4mm ~ in the heel side area
A golf club head having a diameter of 7 mm. 3. The golf club head according to claim 1, wherein a part of the score line provided on the hitting surface is replaced with a dot in the golf club head.