KR101812481B1 - Resonance fortified Saxophone Mouth piece sticker - Google Patents

Abstract

The present invention relates to a resonance fortified saxophone mouth piece sticker and, more specifically, relates to a resonance fortified saxophone mouth piece sticker, which can be manufactured at low costs, and generates a full sound. Therefore, a novice can easily blow a saxophone, and a clear tone can be provided. Moreover, high-pitched vibration can be generated, and the resonance fortified saxophone mouth piece sticker can be detachably attached to a conventional mouth piece.

Description

{Resonance fortified Saxophone Mouth piece sticker}

The present invention relates to a resonance sticker for a saxophone mouthpiece, and more particularly, to a resonance sticker for a saxophone mouthpiece, which is capable of producing a vibrant tone at a high tone, And which can be detachably attached to a mouthpiece.

A mouthpiece for a saxophone means that a player who is engaged with the neck portion of the saxophone and plays the saxophone is formed so as to be blown by the mouth.

These mouthpieces are generally classified into four types according to the structure of the musical instrument, such as a non-crown, a crown, and a gold tube, and the shape and function of the crown are different from each other.

However, when a saxophone mouthpiece is used in connection with a saxophone according to the shape of the saxophone, a very wide variety of sounds can be produced. This is because the shape of the chamber forming the mouthpiece and the inner shape connected to the chamber are uniquely configured, It is known that it is an important factor that can produce various sounds using.

On the other hand, a saxophone is a tip opening that is a narrow gap formed between a mouth piece and a lead that acts as a vibration plate. When a strong air is blown in, a sound is produced by sounding a thin plate of a lead made of bamboo or plastic. The sound that is made when it passes through the tube of the saxophone is amplified and it is released by a loud sound.

At this time, the process of blowing air is effected through double breathing. In the case of the beginner who does not practice breathing and does not practice double breathing, if the air is blown strongly, the saxophone does not sound, There has been a difficult problem.

In order to overcome this difficulty, there have been a number of conventional improved techniques. However, since the conventional structure for constructing the mouthpiece in a special form is different from the conventional one, the manufacturing and selling cost is as high as several million won. There were many things that were not great for the cost.

Therefore, there is a need to develop a new saxophone mouthpiece-related technology that enables beginners to use easily, and skilled musicians can produce a richer tone and a deeper sound than conventional conventional mouthpieces.

Korea Registered Utility Model No. 20-0481069 Korean Utility Model Registration No. 20-0473389 Korean Patent No. 10-0902129

An object of the present invention is to solve the above-mentioned problems, and it is an object of the present invention to provide a musical instrument capable of providing a clear tone, In particular, the invention provides a sticker-type resonance sticker for a saxophone mouthpiece in which a plurality of incision holes or incision grooves are formed, which can be detachably attached to a mouthpiece to achieve a sound resonance effect will be.

The problems to be solved by the present invention are not limited to those mentioned above, and other solutions not mentioned can be clearly understood by those skilled in the art from the following description.

In order to solve the problems of the present invention, there is provided a resonance sticker for a saxophone mouthpiece which is attached between a baffle inner center area and a rear area of a saxophone mouthpiece, wherein the sticker includes left and right Four incision grooves having a structure of being recessed in the direction of the longitudinal direction are arranged,
The size of the incision groove is 8 mm in width, 2 mm in length and 1 mm in depth, and the separation distance between the incision grooves is 1.9 mm or 1.26 mm.

According to the resonance sticker for a saxophone mouthpiece according to the present invention, the resonance sticker can be detachably attached to a conventional mouthpiece, can be easily opened, can provide a rich tone, and can produce vibration at a high tone have.

The effects of the present invention are not limited to those mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the following description.

1A is a photograph of a resonance mouthpiece 10 for a saxophone of the present invention made of a plastic material, a lead 75 and a ligature 70, FIG. 1B is a photograph It is a photograph.
2 is a photograph of a resonance mouthpiece for a saxophone of the present invention made of a metal material so that a plurality of incision grooves 19 appear.
3 is a perspective view showing a configuration in which a plurality of incision grooves are formed in a baffle of a resonance mouthpiece for a saxophone according to the present invention.
FIG. 4 is a cross-sectional view conceptually illustrating changes in air flow and resonance phenomenon caused by the incision grooves according to the present invention.
5A to 5D are graphs corresponding to Tables 1 to 4.
6 is a perspective view showing a resonance sticker for a saxophone mouthpiece according to the present invention.
Fig. 7 is a perspective view showing a state in which the sticker of Fig. 6 is attached.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings and the following description. However, the present invention is not limited to the embodiments described herein but may be embodied in other forms. Rather, the embodiments disclosed herein are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

1A is a photograph of a resonance mouthpiece for a saxophone of the present invention made of a plastic material, a lead and a ligature, FIG. 1B is a photograph showing a state in which the configuration of FIG. 1A is combined, FIG. FIG. 3 is a perspective view showing the construction of a voice piece of a mouthpiece for a saxophone according to the present invention. FIG. 3 is a perspective view showing a voice piece for a saxophone according to the present invention.

1A to 3, a mouthpiece 10 for a saxophone according to the present invention includes a box 13 having a chamber 13 into which air is introduced through a tip opening 12, a barrel 30 on which a ligature 70 for fixing the lead 75 to the outside is mounted and a shank 50 connected to the neck of the saxophone 50, ).

First, the shank 50 is formed behind the dental mouthpiece 10, and engages with the neck of the saxophone.

A reed table 31 on which a reed 75 is placed is formed below the barrel 30 and a ligature for fixing the reed 75 is formed on the outer circumferential surface. (70).

The beak 11 is formed in front of the mouthpiece 10 and is a region where the player comes into contact with the mouth. The beak 11 receives air through a tip opening 12 formed in combination with the lead And a chamber 13 through which it passes.

The chamber 13 is partitioned into a lower open window 14, left and right side walls 15 and an upper baffle 17.

The baffle 17 has a downwardly inclined structure from the barrel 30 toward the tip opening 12. The outer surface of the baffle 17 is a region in which the player wears the upper teeth, (19) is formed. The cutting groove is a groove that does not penetrate the inner and outer surfaces of the baffle, and the degree of processing may vary depending on the thickness of the baffle.

It is possible to optimize the sound property required by the saxophone through the incision groove 19 of the present invention. In other words, the beginner could easily hear the sound, and it was confirmed that the tone was improved and the vibration was generated at the high tone. These three attributes are often regarded as the most important factor when playing a saxophone.

More specifically, a plurality of the incision grooves 19 may be arranged with a separation distance 19d in the front-back direction in which air of the mouthpiece flows.

Each of the cut-out grooves 19 has a structure in which it is elongated in the left-right direction. For example, it is possible to exemplify that the width × length × depth is 8 mm × 2 mm × 0.5 to 1.5 mm, and the length is 1.5 mm to 2.5 mm And the volume is richer as it gets wider.

It is preferred that each incision groove 19 be located from the central region to the rear region of the baffle 17 because if the incision groove is formed in the front region of the baffle it is too close to the tip opening This is because the resonance is not performed well and a rough sound such as a chirping sound is generated. Therefore, it is preferable that the incision grooves are not disposed in at least the first area from the tip opening side when the baffle is tripled in the forward and backward directions in the air flow direction, but are divided into the second to third areas. Further, it is structurally preferable to provide the incision groove in the direction in which the generated sound proceeds, that is, on the opposite side of the lead. In other words, it is preferable to provide the inner surface of the baffle facing the lead in the mouthpiece.

The process of forming the resonance through the resonance mouthpiece for saxophone of the present invention will be described.

FIG. 4 is a cross-sectional view conceptually illustrating changes in air flow and resonance phenomenon caused by the incision grooves according to the present invention.

Referring to FIG. 4, the process of forming resonance through a resonance sticker for a saxophone mouthpiece according to the present invention includes the steps of forming air flow () by introducing air into a chamber through a tip opening (12) A second step of forming a vibration wavelength b with the vibration of the reed 75 by the air introduced into the chamber 13; A third process of forming a turbulent flow (c) by receiving air from the medium-tilting barrel 30 and the vibration wave of the lead 75 being received or collided with the sticky cut hole or incision groove 19 of the present invention And a fourth step of forming a synthesized frequency by the constructive interference while the air flow of the first process, the oscillation wavelength of the second process, and the turbulent flow of the third process are combined. In this process, the sound waves resonate with each other. At this time, the interference of the sound waves not only has a positive effect but also has an unintended negative effect. Therefore, the following experiment was carried out to develop the positive effect while eliminating the negative effect.

Hereinafter, the present invention will be described in more detail with reference to preferred embodiments and comparative examples of a resonance mouthpiece for a saxophone according to the present invention.

As shown in Fig. 1, three incision grooves were formed in a baffle of a saxophone mouthpiece made of plastic.

Here, the incision grooves are 8 mm x 2 mm x 1.0 mm in width x length x depth, and the separation distance between the incision grooves is 1.9 mm.

In Example 1, a cutting groove was formed in the same manner except that the cutting groove was 8 mm x 2 mm x 0.5 mm.

In Example 1, a cut-out groove was formed in the same manner except that the cut-out groove was 8 mm x 1 mm x 0.3 mm.

In Example 1, a cut-out groove was formed in the same manner except that the cut-out groove was 8 mm x 1 mm x 1.5 mm.

In the same manner as in Example 1 except that the incision grooves were 8 mm x 1 mm x 1.7 mm, incision grooves were formed in the same manner.

[Experimental Example 1]

(Item 1), tone improvement (item 2), and generation of vibration at a higher tone (item 3 (item 2)) by varying the number of incision grooves formed in the resonance mouthpiece for saxophone according to Examples 1 to 5, ) Were evaluated.

In this experiment, 30 participants of a saxophone who participated in an off-line gathering meeting once a week for one year or more were experimented. As a control group to be evaluated, a user using a conventional saxophone mouthpiece was given 5 points And the average score was calculated by evaluating the degree of improvement of each item by a scale of 10 points as compared with the conventional saxophone mouthpiece.

In Table 1 below, the averaged evaluation value (item 1) indicating the degree of ease of the player to breathe the saxophone is described, and the evaluation average value of the tone improvement (item 2) , And Table 3 shows the average evaluation value for vibration creation (item 3) at the treble.

It is easy to blow. division 2 incisions Three incisional grooves 4 incisions 5 incisional grooves Example 1 8.6 9.2 9.6 9.1 Example 2 8.0 8.3 9.1 9.2 Example 3 8.3 8.3 8.2 8.5 Example 4 8.1 9.0 9.2 9.2 Example 5 8.0 8.2 8.3 8.1 Control group Based on 5 points

As can be seen from the above Table 1 and FIG. 5a, it can be confirmed that the item evaluation that "easy to blow" is excellent as the number of incision grooves increases. That is, when the incision grooves are three or more, resonance phenomenon appears to occur well.

More specifically, when the scores of Examples 1 to 5 were averaged according to the number of incision grooves, the two incision grooves were 8.2 points (8.6 + 8.0 + 8.3 + 8.1 + 8.0 = 41, 41 = 5 = 8.2) , 8.6 points for three incisional grooves, 8.88 points for four incisional grooves, and 8.82 points for five incisional grooves. From this, it was confirmed that the incision grooves are installed inside the mouthpiece, which is more effective than the non-incision control.

In addition, when the incision grooves increase from two to three incision grooves, the evaluation score of 'easy to bloat' is greatly improved. However, when the incision grooves are five, it is confirmed that the incision grooves are not significantly different from the evaluation scores And it was confirmed that the item "easy to bloat" was favorable when three or four incision grooves were installed, and that it was optimal when four incisions were made.

On the other hand, as a result of the analysis according to the embodiment according to the shape of the incision groove, when the averages of the scores of the incision grooves 2 to 5 were averaged, 9.1 points (8.6 + 9.2 + 9.6 + 9.1 = 33.5, 33.5 / 4 = 9.1 ) In Example 2, 8.65 in Example 2, 8.3 in Example 3, 8.88 in Example 4, and 8.15 in Example 5, respectively. As a result, when the depth of the incision groove is 0.3 mm or the incision depth is 1.7 mm as in the fifth embodiment as in the third embodiment, the evaluation score is lower than that of the first, second, and fourth embodiments, If the score is too low or too deep, the evaluation of the player's feeling of bloating is not good. From this, it can be confirmed that the optimum cutting depth is 0.5 ~ 1.5mm and the optimum value is 1mm in order to realize 'easy to blow' function.

When all the above results are summarized, three or four incision grooves are provided, and the item "easy to blow" is excellent when the incision depth is 0.5 to 1.5 mm. Among them, And the incision grooves were 8 × 2 mm × 1.0 mm in width × length × depth, and the separation distance between the incision grooves was 1.9 mm.

Tone improvement division 2 incisions Three incisional grooves 4 incisions 5 incisional grooves Example 1 8.2 9.1 9.5 8.2 Example 2 7.4 8.5 9.2 7.6 Example 3 6.3 7.2 8.5 7.2 Example 4 7.2 8.6 9.3 7.8 Example 5 6.5 7.3 8.2 6.5 Control group Based on 5 points

As shown in the above Table 2 and FIG. 5B, item evaluation of the 'tone improvement' was confirmed to be most excellent when the number of incision grooves was three or four in the incision grooves, compared with two or five incision grooves.

In other words, the average scores of Examples 1 to 5 were calculated by dividing the number of incision grooves by 7.12 (8.2 + 7.4 + 6.3 + 7.2 + 8.5 = 35.6, 35.6 ÷ 5 = 7.12) 8.14 points in 3 cases, 8.94 points in 4 cases, and 7.46 cases in 5 cases. The results showed that the average score was 7 points for 2 and 5 incisional grooves, while the average score was 8 for 3 and 4 incisional grooves. Particularly, in case of 4 incision grooves, the score was the highest at 9 points. As a result, it was confirmed that the 'tone improvement' item is effective when there are three or four incision grooves having the above-described configuration.

On the other hand, when the shapes of the incision grooves are analyzed according to different embodiments, the points of the incision grooves 2 to 5 are averaged according to the embodiments, and the results are shown as 8.75 (8.2 + 9.1 + 9.5 + 8.2 = 35, 35 4 = 8.75), 8.18 in Example 2, 7.30 in Example 3, 8.22 in Example 4, and 7.13 in Example 5, which means that the incision depth is 0.3 mm too low , Or the resonance effect is not good when the depth of the incision groove is too large as 1.7 mm as in the fifth embodiment. Examples 1, 2, and 4 showed a high evaluation of the 8-point range. As a result, it was found that the cut groove depth was optimum in the range of 0.5 to 1.5 mm for the 'tone improvement', and particularly excellent in the case of 1 mm in the first embodiment.

The above results are summarized as follows. When three or four incision grooves are formed and the depth of incision grooves is 0.5 to 1.5 mm, the effect of improving the tone is excellent. Among them, incision grooves are four, The length × depth was 8mm × 2mm × 1.0mm, and it was confirmed that the separation distance between the incisional grooves is the most optimal value when the distance is 1.9mm.

Create vibrations at high frequencies division 2 incisions Three incisional grooves 4 incisions 5 incisional grooves Example 1 7.2 9.5 9.8 8.0 Example 2 6.5 9.0 9.3 7.8 Example 3 6.2 7.8 8.2 7.5 Example 4 6.3 8.6 9.4 8.5 Example 5 5.1 7.1 8.3 6.5 Control group Based on 5 points

As can be seen from the above Table 3 and FIG. 5C, item evaluation of the 'creation of vibra- tion at the treble' was significantly superior to that of the two or five incision grooves in the case of three or four incision grooves.

The mean score of the incision grooves was 6.26 points for two incisions, 8.40 points for three incisions, 9.00 points for four incisions, and 7.66 points for five incisions. appear. As a result, high-frequency vibration due to the resonance effect was not significant in the case of two or five incision grooves, respectively. However, in the case of three incision grooves and four incision grooves, I got a relatively excellent evaluation in terms of points. In particular, I got the highest score in 4 cases. As a result, it was confirmed that it is optimal to form three or four incision grooves for 'generation of vibrations at high frequencies'.

On the other hand, according to the embodiments in which the shapes of the incision grooves are different from each other, when the scores of the incision grooves 2 to 5 are taken into each of the embodiments, Examples 3 and 5 are low scores of 7 points and 6 points, , 2 and 4 got good evaluation of 8 point range. It was confirmed that the depth of the incision grooves was 0.5 to 1.5 mm in order to optimize the 'generation of vibrations at high frequencies'.

In summary, the effect of 'creating high-frequency vibration' is excellent when there are three or four incision grooves and the incision depth is 0.5 to 1.5 mm. Among them, incision grooves are four, × length × depth is 8 mm × 2 mm × 1.0 mm, and the separation distance between the respective incision grooves is the most optimal value when the distance is 1.9 mm.

[Experimental Example 2]

Four cut-away grooves according to Examples 1 to 5 were formed on resonance mouthpieces for saxophones, respectively, and the cut-away grooves according to Examples 6 to 10 were designed correspondingly. Only the cut-off distances were 1.06 mm, 1.26 mm, 1.50 mm, and 2.12 mm The other three items were evaluated again, that is, easy to blow (item 1), tone improvement (item 2), and vibration at high tone (item 3). Experimental Example 2 was conducted to confirm that resonance phenomena may be different depending on the separation distance when a plurality of incision grooves are formed, and the design of the incision groove spacing is arbitrarily selected.

In this experiment, 30 participants of a saxophone who participated in an off-line gathering meeting once a week for one year or more were experimented. As a control group to be evaluated, a user using a conventional saxophone mouthpiece was given 5 points And the average score was calculated by evaluating the degree of improvement of each item by a scale of 10 points as compared with the conventional saxophone mouthpiece.

Table 4 below shows averages of evaluations for easy to bloom (item 1), tone improvement (item 2) and vibration at high tone (item 3).

division Separation distance 1.06mm Separation distance 1.26mm Separation distance 1.50mm Separation distance 2.12 mm Item 1 Item 2 Item 3 Item 1 Item 2 Item 3 Item 1 Item 2 Item 3 Item 1 Item 2 Item 3 Example 6 8.0 6.1 7.6 9.7 9.2 9.7 8.2 6.5 7.9 7.3 6.5 7.2 Example 7 7.2 6.5 7.8 9.0 9.2 9.1 7.3 6.4 8.0 7.1 6.3 6.3 Example 8 7.3 5.3 6.2 8.1 8.1 8.2 7.2 5.9 6.1 6.5 6.6 6.5 Example 9 7.6 6.7 4.2 8.9 9.2 9.2 7.6 6.5 4.8 6.6 6.2 6.4 Example 10 7.2 5.6 6.1 8.3 8.0 8.1 7.3 6.1 5.5 6.3 6.0 6.1 Control group Item 1 = 5.0 criteria, Item 2 = 5.0 criteria, Item 3 = 5.0 criteria

As can be seen in the above Table 4 and FIG. 5D, it was confirmed that the optimum properties required for the saxophone vary greatly depending on the cut-away distance of the cut groove.

The mean scores of 7.46, 6.04, and 6.38 were obtained for the items 1, 2, and 3, respectively, when the distance was 1.06 mm (average score: 7.46 + 6.04 + 6.38 = 6.63)

The mean scores of 8.8, 8.74, and 8.86 were obtained for the items 1, 2, and 3, respectively, by taking the scores of Examples 6 to 10 together for a distance of 1.26 mm (average score 8.80).

When the distance was 1.50 mm, the average scores of 7.52, 6.28, and 6.46 were obtained for the items 1, 2, and 3, respectively, when the scores of Examples 6 to 10 were averaged (average score: 6.75).

The mean scores of 6.76, 6.32, and 6.50 were obtained by adding the scores of Examples 6 to 10 for items 1, 2, and 3, respectively, when the distance was 2.12 mm (overall average score: 6.52).

As shown above, the simple effect of the simple items averaged over the important attribute items 1, 2, and 3 of the saxophone by the spacing distance was the most effective at 1.26 mm, and the effect at 2.12 mm, 1.5 mm, and 1.06 mm was relatively ineffective. In other words, it was confirmed that the effect varies depending on the distance of the incision gap and the optimal value.

In addition, as shown in Tables 1 to 3, when the cut-away groove separation distance is 1.90 mm, the scores of Examples 1 to 5 for items 1, 2, and 3 are averaged to be 8.88, 8.94, and 9.00 The average score was obtained (overall average score: 8.94). Based on this, it was confirmed that the effect of 1.9mm spacing was also significant.

The total average score of the items 1, 2, and 3 for each distance of separation showed excellent results as 8.80 and 8.94, respectively, only when the distance between the cut-out grooves was 1.26 mm and 1.90 mm, When the distances were 1.06 mm, 1.50 mm, and 2.12 mm, it was confirmed that the performance of the mouthpiece used in the saxophone was inferior due to the poor evaluation of the six-point range.

Particularly, by confirming that the total average score of 1.50 mm, which is placed between 1.26 mm and 1.90 mm, which is the best overall distance score is significantly lower, the separation distance is not excellent within a specific range, but 1.26 mm And 1.90 mm, respectively. This is because the sound generated by the action of the lead and the mouthpiece is due to the fact that the sound wave interference phenomenon depending on the arrangement interval of the incision grooves for resonance operates differently, and the resonance effect is attenuated by the negative effect rather than the positive effect. The optimal spacing of incisional grooves could be obtained through this. Particularly, in the user experience surveyed in Experimental Examples 1 and 2, there were many opinions that when the separation distance is 1.9 mm, the vibration is good in the low sound region and the vibration in the high sound region is relatively better in the 1.26 mm. From this, it was confirmed that the incision groove technique spaced by 1.9 mm is suitable for the tenor saxophone, and the 1.26 mm incision groove technique is suitable for the alto saxophone or soprano saxophone.

Meanwhile, the present invention can also be manufactured in the form of a sticker so as to easily form an incision groove in a resonance mouthpiece for a conventional saxophone.

That is, the resonance sticker for the saxophone mouthpiece attached to the inner surface of the baffle of the saxophone mouthpiece may be configured to have a cut-off hole or a cut-out groove formed in the front-rear direction in which air is introduced from the mouthpiece of the saxophone, Can be formed. The incision hole may also be in the form of a through-hole. The cut-off hole or cut-out groove may have three or four cut-outs, and the cut-off distance may be 1.26 mm or 1.90 mm. This serves as a resonance sticker for the saxophone mouthpiece which increases the friction force and resonance when the high-speed air passes through the mouthpiece quickly, thereby making sound generation more effective.

It is preferable that the incising hole or incision groove is formed in the left-right direction so as to increase the frictional force in the front-back direction and the back-flow direction of the air to increase the friction with the air flow.

FIG. 6 is a perspective view showing a resonance sticker for a saxophone mouthpiece according to the present invention, and FIG. 7 is a perspective view showing a state in which the sticker of FIG. 6 is attached.

6 and 7, a resonance sticker 100 for a saxophone mouthpiece according to the present invention is mounted on a baffle 17 for partitioning the upper portion of the chamber 13 A plurality of cut-out holes 101 or cut-out grooves may be formed by using a pressure-sensitive adhesive (not shown), and having a structure that is elongated in the lateral direction so as to be offset from the front-rear direction in which air is introduced.

The dimensions of the incisional hole 101 or the incisional groove can be set to the same specifications as those of the above-described embodiments and experimental examples, and thus a detailed description thereof will be omitted.

However, the resonance sticker 100 for the saxophone mouthpiece is preferably made of the same material as the mouthpiece or the lead material so that the vibration wave caused by the airflow or the lead is not absorbed. For example, the resonance sticker 100 may be made of rubber, Materials and the like can be exemplified.

[Experimental Example 3]

The experiment was conducted in the same manner as Experimental Example 1 and Experimental Example 2 except that the structure of the incision groove was formed into a flexible plastic sticker having a thickness of 1.7 mm-2 mm without attaching directly to the mouthpiece and attached to the inner surface of the baffle. As a result, the same level of effect as in Experimental Examples 1 and 2 was confirmed.

It is to be understood that the invention is not limited to the form set forth in the foregoing description. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims. It is also to be understood that the invention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.

10: resonance mouthpiece for saxophone 11:
12: tip opening 13: chamber
14: Windows 15: Sidewall
17: baffle 19: incision groove
19d: separation distance 30:
31: Lead table 50: Shank portion
70: Riga 75: Lead
100: resonance sticker 101: incision hole

Claims (3)

A resonance sticker for a saxophone mouthpiece which is attached between a baffle inner central region and a rear region of a saxophone mouthpiece,
The sticker has four cut-away grooves spaced apart in the front-rear direction in which the air is introduced and recessed in the left-right direction,
The size of the incision groove was 8 mm in width, 2 mm in length and 1 mm in depth,
And the spacing distance between the cut-out grooves is 1.9 mm or 1.26 mm.
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