JP2003265655A - Golf club head - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a golf club head which makes good sound when it hits a ball. <P>SOLUTION: As the constitution of an wood-type golf club head 1, the golf club is obtained by welding respective members constituting a head body 1A consisting of a face 2, a crown 4, a sole back face 5, a hosel 6, etc., and has a head volume of 360 cm<SP>3</SP>. The golf club head 1 is made of a β type titanium alloy (Ti-15Al-5V-3Cr alloy), and SUS 630 stainless steel is used only for a sole 3. <P>COPYRIGHT: (C)2003,JPO

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, and more particularly to a hitting sound when hitting a ball on a golf course, a golf driving range or the like.

[0002]

2. Description of the Related Art A hitting sound is emitted from a face portion, a crown portion and a sole portion of a golf club head in different tone colors.

As a first conventional example of the invention relating to the impact sound reverberation of a golf club head, Japanese Patent Laid-Open No. 10-17981.
The following configuration is disclosed in Japanese Patent Laid-Open No. 9. That is,
“In manufacturing titanium golf club heads, α + β
By using at least the face part of a titanium type alloy that has been heat-treated at a temperature between (β transformation temperature −100 ° C.) and less than β transformation temperature, at least the face portion is improved in reverberation at impact frequency in the frequency band of 8 to 10 kHz. A method for manufacturing a golf club head made of titanium, which is characterized by reducing reverberation of a hitting sound in a frequency band of 4 to 6 kHz. Is disclosed.

Further, as a second conventional example, Japanese Examined Patent Publication Sho 55-2.
The following structure is disclosed in Japanese Patent No. 6870.
That is, "a sound producing head golf club characterized in that a shaft is fixed to a vibrating portion of a tuning fork-shaped head, which is composed of an opposing vibrating portion and a node portion, opposite to a ball striking surface".

Further, as a third conventional example, Japanese Patent Laid-Open No. 6-25
The following configuration is disclosed in Japanese Patent No. 4183.
That is, "a wood-type golf club head comprising a recessed sole, a front surface, a top wall extending rearward from the front surface, and an insertion pair of a cushioning material disposed in the recess." Further, "The present invention provides a unique sole plate for metal wood associated with the concept of multi-material damping cushioning is provided with a recess provided with cushioning material and closed by a cover. And acts as a shock absorber that acts to disperse the sound of shock,
This improves the sound and feel of the club. Is disclosed.

Further, as a fourth conventional example, Japanese Patent Laid-Open No. 2000-
The following configuration is disclosed in Japanese Patent Publication No. 300700. That is, "in the measurement method by the impact vibration method,
Maximum peak frequency of impact sound is 4500-8000
A golf club characterized in that the hitting main part or the whole is constructed so that the peak sound pressure of the maximum peak frequency of the impact sound is 78 dB (A) or more in the range of Hz. Is disclosed.

Further, as a fifth conventional example, Japanese Patent Laid-Open No. 2001-2001
The following structure is disclosed in Japanese Patent No. 112894. That is, "the frequency of the hitting sound is 1000 Hz or more and 600
Below 0 Hz, the logarithmic decrement of hitting sound is between 0 and 0.02. Is disclosed.

[0008]

Although the flight distance and the directionality are required items for a golf club, recently, great attention has been paid to the hitting sound. There are two major factors in sound: loudness and timbre, and timbre is an important sensibility factor that determines whether a golf club is good or bad. In particular, recently, there is a tendency that the thickness of the club head becomes thin and the sound becomes significantly low, and along with this, attention is paid to the timbre.

Therefore, various proposals have been made for the components of the hitting sound, those for producing a comfortable sound, and the methods for reducing the loudness of the hitting sound.

However, not only the timbre and loudness of the timbre, but also how to combine preferable timbres has been hardly disclosed in the conventional invention. The hitting sound of a golf club is generated by combining a number of sounds, and it is difficult to express the hitting sound only by the sound having the maximum peak frequency. Other than that, it is necessary to make a comprehensive judgment including the volume and attenuation of the hitting sound.

Japanese Unexamined Patent Publication No. 10-179819 cited as the above-mentioned first conventional example discloses that, in the manufacture of a golf club head made of titanium, an α + β type titanium alloy having a (β transformation temperature −100 ° C.) or more and less than the β transformation temperature is used. By using at least the face part that has been heat-treated at a temperature between 2 and 3, the hitting sound reverberation is enhanced in the frequency band of 8 to 10 kHz, and the hitting sound reverberation is lowered in the frequency band of 4 to 6 kHz. However, there is no description of a plurality of tones.

Further, in Japanese Patent Publication No. Sho 55-26870 cited as a second conventional example, a shaft is fixed to a vibrating portion on the side opposite to the ball striking surface of a tuning fork head composed of a vibrating portion and a node portion facing each other. It is a sounding head golf club characterized by that it produces a large and long sound at the time of hitting a golf ball, and it not only has a pleasant feeling but also can detect the distance by the strength of the sound, the position hit by the sound quality, and increase the flight distance of the ball. Although a golf club has been proposed, the golf club head of the present invention is a golf club head for putters only, judging from the description in the specification and the drawings, there is no description about the wood club head that needs to provide a flight distance. There is a point not.

Further, in Japanese Unexamined Patent Publication No. 6-254183 cited as a third conventional example, a recess extending upward is provided, an insert body of a cushioning material is arranged in the recess, and a cover is inserted in the recess. Has been proposed and the cover is located under the insert in the recess, but no timbre is mentioned.

Furthermore, Japanese Unexamined Patent Application Publication No. 2-59639 cited as a fourth conventional example.
000-300700 discloses a golf club in which the maximum peak frequency of the impact sound is in the range of 4500 to 8000 Hertz and the peak sound pressure is 78 dB (A), but the hitting sound is only one peak. It had a problem that when expressed, it might not match human sensitivity.

Furthermore, Japanese Unexamined Patent Application Publication No. 2-211 cited as a fifth conventional example.
In 001-11284, the frequency of the hitting sound is 10
A golf club having a logarithmic attenuation rate of a hitting sound between 00 Hz and less than 6000 Hz and between 0 and 0.02 has been proposed. However, if the hitting sound is expressed only by the attenuation, it may not match human sensitivity. I had the problem.

In other words, in order to solve the problem that the timbre for a large hitting sound is improved with the increase in head volume, which is a recent tendency, the maximum peak frequency, attenuation, and size of the hitting sound of the club head should be integrated. Then need to be designed. Further, in order to realize it, it is important to control the sole portion of the club head.

In the present invention, the sound pressure level "dB (A)" obtained by adding the A characteristic to the loudness of the sound, the maximum peak frequency "Hz" having the maximum component among the frequency components constituting the sound, and the sound attenuation Three types of values are used: a time width "ms" from the time when the total loudness, which is a time function, shows the maximum value to the time when the total loudness, which is a time function, becomes 1/4. The sound pressure level “dB (A)” is the normal sound pressure level to which the A characteristic of the frequency correction circuit for human auditory characteristics is added. The A characteristic is specified in JIS C 1502. As for the effect of noise on human beings, it is practically psychoacoustic to use the A characteristic when considering not only the loudness but also the noise level. On the other hand, the A characteristic is used.

On the other hand, loudness is used as a method of psychologically evaluating the loudness of a sound. Since "loudness" has a non-linear sound volume, it corresponds well to the human auditory system, and the method for calculating the steady loudness level is determined in ISO532B. That is, "loudness"
Is one of the sensory scales and means loudness. The loudness of a sound is the amount of sensation related to the strength of the sound, and is one of the most basic properties related to the perception of the pitch of the sound and the sounds arranged in the timbre. Size level 40 "dB (A)" (40 phon) 1 "one"
It is expressed by the ratio scale. In the present invention, the time until the maximum value of the total loudness, which is a time function, becomes 1/4 is used as the decay time. By using these values, it is possible to perform evaluation closer to human auditory sense.
It was also found that a good hitting sound can be realized by the methods described in claims 4 to 8.

Therefore, a main object of the present invention is to provide a golf club head, and particularly to provide a club head having a good hitting sound. Also, the maximum peak frequency is
The frequency of the maximum peak value that appears when the sound pressure signal of the hitting sound is subjected to FFT conversion is shown. The above three physical property values were obtained by actually hitting a golf club with a batter swinging at a head speed of 45 m / s. At the same time, the hitting sound was sampled with a DAT recorder, and the sound was evaluated by 60 general golfers including each age group. Scheffe's paired comparison method was used to evaluate the hitting sounds of 12 clubs. Two random hitting sounds were extracted from the collected 12 kinds of hitting sounds, and a questionnaire was asked which sound was better for all 66 combinations. Next, three physical quantities of the sound pressure value, the maximum peak frequency value, and the decay time of the total loudness which is a time function used in the present invention were measured for each of 12 hitting sounds.

Since the hitting sound is a human sensation, there is the opposite opinion that one person likes but another person dislikes it. Therefore, cluster analysis was performed based on the questionnaire conducted by the paired comparison method, and the golfers were divided into three groups. In each group, those with similar preferences regarding the hitting sound are collected, so the sensory scores of 1 to -1 obtained by the Scheffe's paired comparison method are used as dependent variables, and the above three physical quantities are used as independent variables for multiple regression. As a result of the analysis, it was found that a high correlation with the sensory score was obtained. In addition, it is difficult to define the characteristics of these three groups because not only age and golf experience but also various factors are involved.

As a result, it was verified that if all of the physical quantity and sensory multiple regression equations obtained from these three groups had a high score, it would be a golf club with a good hitting sound for all golfers. Also, claim 3
It was also confirmed that a good hitting sound can be realized by the methods described in ~ 8.

Therefore, a main object of the present invention is to provide a golf club head, and particularly to provide a club head having a good hitting sound.

[0023]

The invention according to claim 1 is
When a golf ball is hit with a golf club at a head speed of 45 m / s, the length L is 1 m from the set position of the golf ball toward the front front of the batter, and
A microphone is placed at a position where the height H is 1.5 m toward the set position of the golf ball, and 0.2 mm before the ball is hit at this position.
The time until the maximum value of the total loudness, which is a time function, becomes 1/4 by collecting the hitting sound for a total of 1.0 "s" of "s" and 0.8 "s" after hitting and analyzing the hitting sound. Tr "m
s ", maximum peak frequency Fp" Hz ", sound pressure" dB "
When the value of (A) ”is Sa, the three groups obtained by performing the cluster analysis on the golfer's preference for the hitting sound are the formulas for evaluating the hitting sound. The formula for evaluating the hitting sound obtained from one group is

[0024]

[Equation 7] 0.5 ≦ −9.14 + 0.000948 × Tr + 0.0000327 × Fp + 0.103 × Sa ≦ 1.0 ··· (1) and the formula for evaluating the hitting sound obtained from the second group is

[0025]

[Equation 8] 0.4 ≦ −1.63−0.0285 × Tr + 0.0000757 × Fp + 0.0352 × Sa ≦ 1.0 ··· (2) and the equation for evaluating the hitting sound obtained from the third group is

[0026]

[Formula 9] 0.35 ≦ −5.80 + 0.0000429 × Fp + 0.0645 × Sa ≦ 1.0 ... (3) A golf club head designed to satisfy the condition (3). Further, in the invention according to claim 2, when the golf ball is hit with a golf club at a head speed of 45 m / s, the length L is 1 m from the set position of the golf ball toward the front front of the batter. , And the microphone is placed at a position where the height H is 1.5 m toward the set position of the golf ball.
2 "s" and 0.8 "s" after hitting, total 1.0 "s"
The time until the maximum value of the total loudness which is a time function becomes 1/4 is Tr
"Ms", maximum peak frequency Fp "Hz", sound pressure "d"
When the value of “B (A)” is Sa, the three groups obtained by performing the cluster analysis on the golfer's preference for the hitting sound are the expressions for evaluating the hitting sound, Formula 4, Formula 5, and Formula 6, The formula for evaluating the hitting sound obtained from the first group is

[0027]

[Equation 10] 0.7 ≦ −9.14 + 0.000948 × Tr + 0.0000327 × Fp + 0.103 × Sa ≦ 1.0 ··· (4) and an expression for evaluating the hitting sound obtained from the second group. But

[0028]

[Equation 11] 0.6 ≦ −1.63−0.0285 × Tr + 0.0000757 × Fp + 0.0352 × Sa ≦ 1.0 ... (5) and the formula for evaluating the hitting sound obtained from the third group is

[0029]

[Equation 12] 0.55 ≦ −5.80 + 0.0000429 × Fp + 0.0645 × Sa ≦ 1.0 (6) A golf club head designed to satisfy the condition (6). As a difference from the numerical limitation of the golf club of the present invention, a multiple regression analysis is performed with the score obtained by the Scheffe's paired comparison method as the dependent variable and the above three physical quantities as independent variables. It was divided into three groups according to the calculation.
In each group, looking at the significance of the independent variable, the number 1,
Formulas 2 and 3 were created. Inevitably, the maximum value evaluated by this formula is a value close to 1, but the number 1 is 0.5.
In a golf club head in which the number 2 is 0.4 or less or the number 3 is 0.35 or less, the hitting sound is a hitting sound that is not powerful to the golfer, and thus the golfer generally does not have a favorable impression. Even if the flight distance is improved, the golf market has a problem that it cannot be supplied as a golf club. On the other hand, the number 1, the number 2, the number 3, the number 4, the number 5, and the number 6 do not exceed 1 due to the nature of multiple regression, but there is a possibility that a golf club more than 1 will be invented in the future. There is also. In these clubs, the hitting sound is too loud and gives offensive and unpleasant sounds for golfers. In addition, the residents around the golf driving range complained that the hitting noise would cause environmental damage. May have certain drawbacks.

According to a third aspect of the present invention, in the golf club head according to the first or second aspect, the golf club head is made of β-type titanium alloy.

In the present invention, the material for the golf club head is preferably one that can be forged or pressed, and particularly, in the case of β type titanium alloy, a golf club head that produces a high hitting sound and a high sound that a golfer likes. Can be provided. Examples of β-type titanium alloys include Ti-15Mo-5Zr-3Al alloy, Ti-15V-3Cr-3Sn-3Al alloy, and Ti-2.
2V-4Al alloy, Ti-13V-11Cr-3Al alloy, Ti-8Mo-8V-2Fe-3Al, Ti-3A
1-8V-6Cr-4Mo-4Zr alloy, Ti-11.
5Mo-6Zr-4.5Sn alloy, Ti-15Mo-5
There are Zr alloys and the like.

In the invention according to claim 4, the invention according to claim 1,
A golf club head according to 2 or 3, a golf club head, wherein the volume is 330 cm ³ or more 500 cm ³ or less. In addition, as a difference from the numerical limitation of the golf club of the present invention, when the volume of the golf club head is 330 cm ³ or less, the sound pressure of the hitting sound becomes low, and the number 1 is 0.5 or less or the number 2 is 0.4 or less. Below or
The number 3 becomes a golf club head showing 0.35 or less,
Since the hitting sound becomes a hitting sound that is not powerful to the golfer, there is a problem that the golfer generally does not like it even if the flight distance is improved. or,
In a club head having a volume of the golf club head of 500 cm ³ or more, the maximum peak frequency is considerably low, and therefore the number 1 is 0.5 or less, or the number 2 is 0.4 or less, or
The number 3 becomes a golf club head showing 0.35 or less, and the hitting sound is a hitting sound which is not powerful to the golfer, so that there is a problem that the golfer generally does not have a favorable impression. On the other hand, number 1, number 2, number 3, number 4, number 5,
A golf club in which the number 6 becomes 1 or more has not yet been realized, and if it is realized, the evaluation value may exceed 1, and the hitting sound is too loud and causes a discomforting sound that is offensive to the golfer. There is a fatal drawback that residents around the golf driving range complain as environmental damage due to hitting noise.

In the invention according to claim 5, said claim 1,
The golf club head according to any one of 2, 3 or 4 is characterized in that the sole portion is made of a material having a Young's modulus E of 220 GPa or more and 350 GPa or less. The difference from the numerical limitation of the golf club of the present invention is that the Young's modulus E of the golf club head is 22.
If it is less than 0 GPa, the club head becomes too soft and the maximum peak frequency of the hitting sound becomes low.
The following or 2 shows 0.4 or less, or 3 shows 0.35 or less. With such a golf club head, the hitting sound becomes a hitting sound that is not powerful to the golfer, so that the flight distance is improved. Even so, there was a problem that golfers generally did not like it. Further, when the Young's modulus E of the golf club head is 350 GPa or more, the material is hard and the sound pressure of the hitting sound becomes low, so that the number 1 is 0.5.
The following or 2 shows 0.4 or less, or 3 shows 0.35 or less. With such a golf club head, the hitting sound becomes a hitting sound that is not powerful to the golfer, so that the flight distance is improved. Even so, there was a problem that golfers generally did not like it. On the other hand, golf clubs in which the formula 1, the formula 2, the formula 3, the formula 4, the formula 5, and the formula 6 are 1.0 or more have not yet been realized, and if they are realized, the evaluation value may exceed 1.0. However, the hitting sound is too loud and becomes unpleasant for the golfer, and there is a fatal drawback that residents around the golf hitting range complain as environmental damage due to hitting noise. You may have.

In the invention according to claim 6, said claim 1,
The golf club head described in 2, 3, or 4 is characterized in that the sole portion is made of a stainless material.

In the invention according to claim 7, said claim 1,
In the golf club head described in 2, 3, or 4, the average thickness of the sole portion is 2 mm or more and 3 mm or less. As a difference from the numerical limitation of the golf club of the present invention, when the average thickness of the sole portion of the golf club head is 2 mm or less, the sole portion becomes too soft and the maximum peak frequency of the hitting sound becomes low. Since 0.5 or less, or the number 2 indicates 0.4 or less or the number 3 indicates 0.35 or less, the hitting sound of such a golf club head becomes a hitting sound that is not powerful to the golfer. Even if the flight distance is improved, there is a problem that golfers generally do not like it. Similarly, even when the average thickness of the sole portion of the golf club head is 3 mm or more, the sole portion becomes too hard and the sound pressure of the hitting sound becomes low. Therefore, the number 1 is 0.5 or less, the number 2 is 0.4 or less, or the number 3 is 0.3 or less.
In order to show 5 or less, in such a golf club head,
Since the hitting sound becomes a hitting sound that is not powerful to the golfer, there is a problem that the golfer generally does not like it even if the flight distance is improved. On the other hand, golf clubs in which the formula 1, the formula 2, the formula 3, the formula 4, the formula 5, and the formula 6 are 1.0 or more have not yet been realized, and if they are realized, the evaluation value may exceed 1.0. However, the hitting sound is too loud and becomes unpleasant for the golfer, and there is a fatal drawback that residents around the golf hitting range complain as environmental damage due to hitting noise. You may have. In the invention according to claim 8, in the golf club head according to claim 1, 2, 3, 4, 5, 6 or 7, the sole portion has an average radius of curvature in the toe-heel direction of 5.1 cm or more and 7. 6 cm or less and an average radius of curvature in the face-back direction of 8.9
A golf club head having a size of not less than cm and not more than 15.2 cm. As a difference from the numerical limitation of the golf club of the present invention, in the golf club head, the average radius of curvature of the sole portion in the toe-heel direction is 5.
When the average radius of curvature in the face-back direction is 1 cm or less and the face-back direction is 8.9 cm or less, the sole portion becomes too soft and the maximum peak frequency of the hitting sound becomes low.
Below, or the number 2 becomes 0.4 or less, or the number 3 becomes a golf club head showing 0.35 or less, and since the hitting sound becomes a hitting sound that is not powerful to the golfer, even if the flight distance is improved. There was a problem that golfers generally did not like it. Further, in the golf club head, when the average radius of curvature in the toe-heel direction of the sole part is 7.6 cm or more and the average radius of curvature in the face-back direction is 15.2 cm or more, the sole part becomes too hard. The sound pressure of the hitting sound becomes low, the number 1 becomes 0.5 or less, the number 2 becomes 0.4 or less, or the number 3 becomes 0.35 or less, and the hitting sound becomes a powerful feeling for the golfer. Since there is no hitting sound, there is a problem that golfers generally do not have a favorable impression even if the flight distance is improved. On the other hand, golf clubs in which the formula 1, the formula 2, the formula 3, the formula 4, the formula 5, and the formula 6 are 1.0 or more have not been realized yet, and if they are realized, the evaluation value may exceed 1. The hitting sound is too loud and makes the golfer uncomfortable, and there is a fatal drawback that residents around the golf driving range complain as environmental damage due to hitting noise. There is a nature.

[0036]

BEST MODE FOR CARRYING OUT THE INVENTION The hitting sound was measured by the method shown in FIG. First, the compression is 100 (compression is the amount of load when the ball is deformed by a certain amount. For example, a measuring instrument called "commodity name: compression 270" manufactured by Kamoshita Seikousho Co., Ltd. is used. When you hit a golf ball with a head speed of 45 m / s,
From the set position of the golf ball toward the front of the golf player 10 in the front direction, the length L is 1 m and the height H is 1.5.
At a position of m, a microphone 30 "product name; condenser microphone 4165" manufactured by Brüel & Kjær, which is connected to a microphone power supply 35 "product name; type 2804 type microphone power supply" manufactured by Brüel & Kjær, is arranged. , The sound of hitting ball at this position is DAT recorder 40 manufactured by TEAC Corporation.
Collect and analyze using "trade name; DA-P20". D
The AT recorder 40 simultaneously captures a calibrated sound of 1 KHz and 94 dB. The analysis of the hitting sound is performed by Bruel
The software "trade name; 7698 type sound quality evaluation software" manufactured by KAIR Co., Ltd. was used. This software has calibration data, 0.2 "s" before the hit and 0.8 after the hit.
A total of 1.0 "s" of hitting sound data of "s" was captured. This data was used to determine the above-mentioned three parameters. The program setting conditions are (1) X-axis scale: Ba
rk Scale, “Coordinates are bulk coordinates” (2) Sound Field: Dif
fuse, "Sound field is diffusion" (3) Resolution: 1/16 Bark, "Resolution is 1/16 bulk" (4) Total meas. time: 1.00
s, "Total time is 1 second" (5) Multispectrum Time Del
ay: 0.2s, "Multi-spectral time delay is 0.2 seconds"
(6) Multispectrum Time between Spectra: 0.001s,
"Multi-spectral time interval time 0.0
01 seconds ". Using the data for 1.0 s, the time from the moment when the maximum total loudness value obtained from the total loudness versus time is taken to the time when the total loudness value becomes 1/4, is corrected by the A characteristic. The sound pressure value and the maximum peak frequency were obtained. For example, in the conventional golf club, the decay time Tr of the loudness, the sound pressure value Sa, the maximum peak frequency Fp, and the value indicating the goodness of the sound are as shown in Table 1.

[0037]

[Table 1] Conventional example

In this sound, all of the equations 1, 2, and 3 are
It shows a negative value, and it cannot be said that the hitting sound is good. There are three formulas because the golfers are classified into three types.

[0039]

EXAMPLE In the present invention, as shown in FIG. 1, when a golf ball 20 is hit with a golf club 50 at a head speed of 45 m / s, the front direction of the front of the golf player 10 from the set position of the golf ball 20. Toward the length L
Is 1 m and the height H is 1.5 m, and the microphone 30 to which the microphone power supply 35 is connected is placed at a position of 0.2 "s" before hitting and 0.8 "s" after hitting. A total of 1.0 "s" of the hitting sound is output by the DAT recorder 40 (the DAT recorder simultaneously operates 1 KHz, 9
4 dB calibration sound is taken in) to analyze the hitting sound. Tr "ms" is the time until the maximum value of the total loudness, which is a time function, becomes 1/4, the maximum peak frequency. Where Fp is "Hz" and the sound pressure is "dB (A)" is Sa, the three groups obtained by performing a cluster analysis of the golfer's preference for the hitting sound are used to evaluate the hitting sound. In Formula 1, Formula 2 and Formula 3, the formulas for evaluating the hitting sound obtained from the first group are

[0040]

[Equation 13] 0.5 ≦ −9.14 + 0.000948 × Tr + 0.0000327 × Fp + 0.103 × Sa ≦ 1.0 ··· (1) and an expression for evaluating the hitting sound obtained from the second group But

[0041]

[Equation 14] 0.4 ≦ −1.63−0.0285 × Tr + 0.0000757 × Fp + 0.0352 × Sa ≦ 1.0 ··· (2) and the formula for evaluating the hitting sound obtained from the third group is

[0042]

[Formula 15] 0.35 ≦ −5.80 + 0.0000429 × Fp + 0.0645 × Sa ≦ 1.0 ... (3) A golf club head designed to satisfy the condition (3). In addition, when considering as a preferable golf club head as the second embodiment of the present invention,
When a golf ball is hit with a golf club at a head speed of 45 m / s, the length L is 1 m and the height H is 1.5 m from the set position of the golf ball toward the front of the batter. The microphone is placed at the position facing the set position of the golf ball, and at this position, before the ball is hit.
2 "s" and 0.8 "s" after hitting, total 1.0 "s"
The time until the maximum value of the total loudness which is a time function becomes 1/4 is Tr
"Ms", maximum peak frequency Fp "Hz", sound pressure "d"
When the value of “B (A)” is Sa, the three groups obtained by performing the cluster analysis on the golfer's preference for the hitting sound are the expressions for evaluating the hitting sound, Formula 4, Formula 5, and Formula 6, The formula for evaluating the hitting sound obtained from the first group is

[0043]

[Equation 16] 0.7 ≦ −9.14 + 0.000948 × Tr + 0.0000327 × Fp + 0.103 × Sa ≦ 1.0 ··· (4) and an expression for evaluating the hitting sound obtained from the second group. But

[0044]

[Equation 17] 0.6 ≦ −1.63−0.0285 × Tr + 0.0000757 × Fp + 0.0352 × Sa ≦ 1.0 ... (5) and the formula for evaluating the hitting sound obtained from the third group is

[0045]

[Formula 18] 0.55 ≦ −5.80 + 0.0000429 × Fp + 0.0645 × Sa ≦ 1.0 (6) A golf club head characterized by being designed to satisfy the condition (6).

Next, a specific embodiment 1 of the present invention will be described with reference to the drawings. That is, the golf club head 1 such as the wood type shown in FIG. 2 has a face portion 2 and a crown portion. A golf club head having a head volume of 360 cm ³ obtained by welding and joining the respective members constituting the head main body 1A composed of 4, the sole / back face portion 5, the hosel portion 6 and the like, wherein the golf club head 1 is β
It is made of a type titanium alloy (Ti-15Al-5V-3Cr alloy), and SUS630 stainless is used only in the sole portion 3. In contrast to the conventional club 1 shown in Table 1 in which all the golf club heads are made of β-type titanium alloy (Ti-15Al-5V-3Cr alloy), the value of Formula 1 is " 0.63 ", the value of 2) is" 0.59 ",
The value of the equation 3 was “0.44”. 40 hitting sounds
When 5 subjects were evaluated by 5 grades (1: Poor ⇔ 5: Good), the average of the 5 grades of the conventional golf club was 2.3.
On the other hand, the average value was 3.5, which was a high number.

[0047]

[Table 2] Example 1

It is considered that the sound pressure and the sound of the maximum peak frequency were increased by changing the sole portion to SUS630 stainless steel.

A second embodiment of the present invention will now be described with reference to the drawings. That is, the golf club head 1 such as the wood type shown in FIG. 3 has a face portion 2 and a crown portion. A golf club head 1 having a head volume of 350 cm ³ obtained by welding and joining the respective members constituting the head main body 1A composed of 4, the sole / back face portion 5, the hosel portion 6, etc., and the golf club head 1 is β-type titanium. Alloy (Ti-15Al-5V-3Cr alloy)
The average thickness of the sole portion 3 was 2.45 mm. All golf club heads are β type titanium alloys (Ti
-15Al-5V-3Cr alloy), the value of Formula 1 is "0.95" and the value of Formula 2 is "0. 94 ”and the value of the number 3 became“ 0.64 ”. When the hitting sound was actually evaluated by 40 subjects in 5 grades (1: bad ⇔ 5: good),
The conventional golf club showed a high number of 4.6 on average, while the average was 2.3 on a 5-point scale.

[0050]

Table 3 Example 2

It is considered that the sound pressure and the maximum peak frequency are increased by increasing the thickness of the sole portion.

The material of the sole portion has a Young's modulus of 220 GPa or more and 350 GPa or less, for example,
A tungsten nickel (W-Ni) alloy or a carbon composite material may be used.

[0053]

As described above, in the golf club head of the present invention, it is possible to provide a club head having a good hitting sound which is produced when hitting a ball on a golf course, a golf driving range or the like. Is played.
Further, in the golf club head of the present invention, the hitting sound like a conventional golf club head is too loud and becomes a sound with unpleasant sensation for the golfer, and from the residents around the golf hitting range, It is also possible to improve the fact that complaints are emitted as environmental damage due to hitting noise.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a measurement situation of a hitting sound.

FIG. 2 is a first embodiment of a golf club head according to the present invention.
Perspective view of the sole back face member

FIG. 3 is a second embodiment of the golf club head according to the present invention.
Perspective view of the sole back face member

FIG. 4 is a graph showing the total loudness and the decay time relating to the hitting sound of the golf club head according to the present invention.

[Explanation of symbols]

1 golf club head 1A head body 2 face part 3 sole part 4 Crown 5 sole back face part 6 Hosel part 10 golfers 20 golf balls 30 microphone 35 microphone power supply 40 DAT recorder 50 golf clubs

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kei Tsuji             12-35 South Kohoku, Suminoe-ku, Osaka City, Osaka Prefecture             Issue Mitsuno Co., Ltd. F term (reference) 2C002 AA02 CH01 CH02 CH06 MM04                       PP02 PP03

Claims (8)

[Claims] 1. A head speed of 4 using a golf club.
When hitting a golf ball at 5 m / s, a microphone is placed at a position where the length L is 1 m and the height H is 1.5 m from the set position of the golf ball toward the front of the batter. It is placed toward the set position, and at this position, the hitting sound is sampled for 0.2 "s" before hitting and 0.8 "s" after hitting, for a total of 1.0 "s", and the hitting sound is analyzed to perform a time function. The time until the maximum value of the total loudness becomes 1/4 is Tr “ms”, and the maximum peak frequency is Fp “H”.
z, and sound pressure “dB (A)” are set to Sa, three groups obtained by performing cluster analysis on the golfer's preference for hitting sound are used to evaluate the hitting sound.
In Equations 2 and 3, the formula for evaluating the hitting sound obtained from the first group is as follows: 0.5 ≦ −9.14 + 0.000948 × Tr + 0.0000327 × Fp + 0.103 × Sa ≦ 1.0 ... (1) and the formula for evaluating the hitting sound obtained from the second group is as follows: [Equation 2] 0.4 ≦ −1.63−0.0285 × Tr + 0.0000757 × Fp + 0.0352 × Sa ≦ 1.0 ... (2 ), And the equation for evaluating the hitting sound obtained from the third group satisfies the following condition: (3) 0.35 ≦ −5.80 + 0.0000429 × Fp + 0.0645 × Sa ≦ 1.0 (3) A golf club head characterized by being designed in. 2. A head speed of 4 using a golf club.
When hitting a golf ball at 5 m / s, a microphone is placed at a position where the length L is 1 m and the height H is 1.5 m from the set position of the golf ball toward the front of the batter. It is placed toward the set position, and at this position, the hitting sound is sampled for 0.2 "s" before hitting and 0.8 "s" after hitting, for a total of 1.0 "s", and the hitting sound is analyzed to perform a time function. The time until the maximum value of the total loudness becomes 1/4 is Tr “ms”, and the maximum peak frequency is Fp “H”.
z, and sound pressure "dB (A)" are set to Sa, three groups obtained by performing a cluster analysis on the golfer's preference for hitting sound are used to evaluate the hitting sound.
In Equations 5 and 6, the equation for evaluating the hitting sound obtained from the first group is as follows: 0.7 ≦ −9.14 + 0.000948 × Tr + 0.0000327 × Fp + 0.103 × Sa ≦ 1.0 ...・ ・ (4) and the formula for evaluating the hitting sound obtained from the second group is as follows: 0.6 ≦ −1.63−0.0285 × Tr + 0.0000757 × Fp + 0.0352 × Sa ≦ 1.0. .. (5) and the formula for evaluating the hitting sound obtained from the third group is as follows: [Formula 6] 0.55 ≦ −5.80 + 0.0000429 × Fp + 0.0645 × Sa ≦ 1.0 (6) A golf club head characterized in that it is designed to satisfy the conditions of. 3. The golf club head according to claim 1, wherein the golf club head is made of β-type titanium alloy. 4. The golf club head, wherein the golf club head has a volume of 330 cm ³ or more and 500 cm or more.
^{It is 3} or less, The golf club head of Claim 1, 2 or 3 characterized by the above-mentioned. 5. The golf club head according to claim 1, wherein the sole portion is made of a material having a Young's modulus E of 220 GPa or more and 350 GPa or less.
The golf club head according to 3 or 4. 6. The golf club head according to claim 1, wherein the sole portion of the golf club head is made of a stainless material. 7. The golf club head according to claim 1, wherein in the golf club head, the sole portion has an average wall thickness of 2.0 mm or more and 4.0 mm or less. Club head. 8. In the golf club head, the sole portion has an average radius of curvature in the toe-heel direction of 5.1 cm or more and 7.6 cm or less, and an average radius of curvature in the face-back direction of 8.9 cm or more and 15.2 cm. The golf club head according to claim 1, 2, 3, 4, 5, 6 or 7, wherein: