JPH0123794B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement of a synthetic resin flute that can be expected to improve sound quality.

[Conventional technology]

For example, patent no.
No. 589818, Patent No. 873379, Utility Model Application No. 55-130387
No., JP-A-54-48217, etc. are known.

[Problem to be solved by the invention]

As mentioned above, it is known that improvements have been made to the head pipes of flutes in the past for the purpose of improving sound quality, but in all of these cases, when forming the pipe body parts using synthetic resin, The main purpose of this is to prevent shrinkage distortion, which tends to occur during the molding process, by forming the components of the head tube thinner in particular. Therefore, the improvement of sound quality is achieved by preventing the occurrence of molding distortion. This could be said to be an effect associated with doing so. However, in synthetic resin flutes, if the component parts are molded thin to prevent molding distortion, the rigidity of the parts that have an important effect on sound quality, especially the head pipe, will be reduced.
As a result, the head tube resonates due to air vibrations in the tube's internal bore caused by playing, resulting in a disadvantage in that the sound quality deteriorates.

Furthermore, in the conventional synthetic resin flute, as a means for forming an airway in the head pipe, Fig. 9A and B are used.
It has been common practice to provide a hollow airway plug P having a partition wall W at the rear end of a cylindrical portion S, as shown in FIG. However, in the airway plug P having such a shape, shrinkage strain H occurs at the peripheral edge of the partition wall W during molding, so in order to manufacture a high-quality product without such distortion, it is necessary to adjust the heat during molding or demold. The problem was that the cooling treatment method required during this process required advanced technology, and the production cost was high, making it unsuitable for mass production.

[Means to solve the problem]

It has long been known that the sound quality of a musical instrument has a close relationship with the hardness and elasticity of the materials that make up the main body of the instrument, and that musical instruments made of harder materials produce richer sound quality. The present invention is based on such a long-known theory, and aims to increase the material rigidity of the head tube, which has a large effect on the sound quality of main wind instruments, in other words, to prevent the occurrence of molding distortion. The structural members of the pipe are made thin, but as a result of the thinner and lighter members, the rigidity is lost.
By adding substantial rigidity to the members that make up the airway, we have solved the causes of deterioration of sound quality due to the head tube resonating with the air vibrations inside the tube, and the causes of molding distortion around the septum of the airway plug. This is what we are trying to resolve by doing this. As a specific means for that purpose, the present invention provides a cylindrical body that penetrates in the length direction into the distal end insertion portion of the head tube and has an airway or a part of the airway on the upper surface, An airway tube having a recessed fitting step at the end is inserted, and a space portion is provided in the airway tube for adjusting the required cross-sectional area and weight;
A flange is provided at the rear end of the airway tube to fit with a fitting step portion of the airway tube, and the internal volume of the airway tube is substantially reduced to prevent resonance of the airway tube due to air vibration inside the tube. It is characterized by a sound quality adjustment plug that is tightly fitted and closed.

[Effect]

In the present invention, a sound quality adjustment plug having a required cross-sectional area and weight capable of imparting substantial rigidity to the airway tube is tightly fitted and closed inside the airway tube as a component of the head tube. It is possible to appropriately prevent the airway tube from resonating due to air vibrations occurring in the tube internal bore behind the airway tube, that is, from causing the head tube itself to resonate as a result. In this case, subtle adjustments to the sound quality depending on the type of flute,
This can be done by making a blind hole of an appropriate size in the sound quality control plug that closes the inside of the airway cylinder, or by cutting one or more grooves on the surface of the plug. In addition, since the airway tube is molded as a complete cylinder without a partition at the rear end like conventional airway plugs, there is no fear that molding distortion will occur at the periphery of the partition, which would occur when the airway tube has a partition. can do.

〔Example〕

Next, the present invention will be explained with reference to embodiments shown in the drawings. Fig. 1 shows an example in which the present invention is applied to a woodwind instrument of Patent No. 589818, where 1 is a woodwind, 4 is a head pipe, and 6 is a connection. 7 indicates an edge, and 27 indicates a bore inside the head tube 4. The head pipe 4 has a protrusion 1 on the outer periphery.
5, and the airway tube 10 is inserted into the airway tube insertion portion 8 which protrudes toward the distal end by the protrusion 15 so that the outer periphery of the airway tube 10 is in close contact with the inside. This airway tube 10
As shown in FIGS. 2 and 3, an airway 11 is formed in the upper part, and a hollow part 18 is provided in the lower part of the back surface of this airway 11 for holding the airway 11 inside the head tube 4. It consists of a cylinder 9 that penetrates in the length direction, and at the rear end of the inner peripheral surface of the cylinder 9, there is a fitting stepped part 19 with a thinner wall so that the inner diameter is slightly larger than that of the hollow part 18. is provided.

Originally, the airway 11 was used as a component of the head tube 4.
Forming the cylindrical airway tube 10 having a hollow portion 18 in the lower part of the back surface of the airway tube 10 includes not only this airway tube 10 but also the outer tube 13 fitted to the outer periphery of the airway tube insertion portion 9. This is based on the circumstances of the molding process, in which each component is molded thinly so that shrinkage distortion does not occur during molding. By the way, when the constituent members of the head tube 4 including the airway 11 are molded to be thin, the occurrence of molding distortion can be prevented, but on the other hand, the rigidity of the head tube 4 itself is lost, and the inside of the tube is Air vibration within the hole 27 causes the airway tube 1 to
The vibration is transmitted to the entire head tube 4 through the rear end wall of the head tube 4, causing the head tube 4 to resonate and making the air vibration inside the tube inner hole 27 unstable, resulting in deterioration of sound quality.

Therefore, in the present invention, the internal volume of the hollow part 18 is reduced by tightly fitting the sound quality adjustment plug 12 as shown in FIG. The hollow portion 18 is substantially reduced in size so that the inside of the hollow portion 18 is not easily subjected to air vibrations from the tube inner hole 27. It is preferable to use a hard material such as metal, wood, stone, ceramics, or plastic as the material for the sound quality control plug 12, and its basic shape is as shown in FIG. 10, and has an airway support surface 12a in contact with the airway lower surface 11a of the airway tube 10, and a fitting stepped portion 1 provided at the rear end of the inner peripheral surface of the airway tube 10 at the rear end.
A flange 21 that is fitted and locked with 9 is provided.
It is preferable that the airway cylinder hollow part 18 has an external shape that is solid.

Of course, depending on the material of the sound quality adjustment plug 12, the mass of the head pipe 4 may increase unduly due to the difference in mass.
This may cause some inconvenience during performance. Therefore, even if a certain degree of resonance remains, it is not enough to deteriorate the sound quality.
It is also possible to reduce the weight by hollowing out or scraping a part of the stopper. Further, when the shape of the sound quality adjustment plug 12 is solid as shown in FIG. 4, resonance with the head tube 4 is reliably prevented, and air vibration within the tube inner hole 27 is kept in a good condition.
You can expect perfect sound quality, but depending on the performer's preference,
Depending on the type and size of the instrument, even if some resonance may occur as long as it does not deteriorate the sound quality, you can expect a sound quality that is different from perfect sound quality and has a positive change. You can also do that. For this reason, in the present invention, as shown in FIG. 5A, a blind hole 22 having a desired cross-sectional shape along the length direction is provided in the sound quality adjustment plug 12 to adjust the weight, or As shown in FIGS. 5B and 5C, one or more grooves 24 are cut in the airway support surface 12a, excluding the surface of the flange 21, so as to be inclined from the proximal end 23 toward the distal end to prevent loss of hardness. The weight, cross-sectional area, elastic modulus, etc. are appropriately selected to allow for a wide range of freedom in adjusting the appropriate sound quality. B in Figure 5,
The sound quality adjustment plug 12 shown in C is fitted into the hollow portion 18 from the rear end side of the airway tube 10 having the fitting stepped portion 19, and the rear end flange 21 of the plug 12 is inserted into the airway tube 10.
Since the airway tube 10 is engaged in the fitting stepped portion 19 and fixed at a predetermined position, the rear end opening of the airway tube 10 is closed by the rear end surface 20 of the sound quality adjustment plug 12. When the sound quality adjustment plug 12 is fitted into the airway cylinder 10 in this way, the upper airway support surface 12
a firmly supports the lower surface 11a of the airway 11, thereby substantially reducing the volume inside the hollow portion 18, and the rear end surface 20 of the sound quality adjustment plug 12
It will play the role of a partition wall in contact with 7. Therefore, in this case, the rear end surface 20 of the sound quality adjustment plug 12 does not come into contact with the air vibrations inside the tube inner hole 27 as a mere thin wall surface, but the solid sound quality adjustment plug 12 as a whole remains in a block shape and does not come into contact with the air vibration inside the tube inner hole 27. Since it comes into contact with air vibration, the factors that cause the airway tube 10 to resonate can be significantly suppressed. Further, if the sound quality adjustment plug 12 is provided with the blind hole 22 or the groove 24 as described above, a small space 16 will be left inside the airway tube 10, but the blind hole 22 or the groove Since the size of 24 can be freely set in advance, good sound quality can be adjusted within a range that does not deteriorate the sound quality.

FIG. 7 shows an embodiment in which the present invention is applied to the woodwind instrument of Patent No. 873379. In this woodwind instrument, the airway wall 25, which constitutes a part of the airway 11, is formed above the airway plug insertion part 9 at the tip of the head tube 4, and the airway tube 10 is shown in FIGS. 8A and 8B. In this manner, the lower airway wall 26, which forms a pair with the upper airway wall 25, is formed integrally with the hollow portion 18. Therefore, in this case as well, by inserting the sound quality adjustment plug 12 into the airway tube 10, it is possible to form the head tube 4 that does not cause deterioration in sound quality.

〔effect〕

In the woodwind instrument according to the present invention, each component of the head tube is formed thinly to achieve molding distortion.
The phenomenon of resonance caused by air vibrations generated in the tube internal bore due to the decrease in rigidity due to the thin wall can be solved by creating a space and mass with a required cross-sectional area in the hollow part of the airway tube to reduce the internal volume of the hollow part. This is prevented by tightly fitting the sound quality control plug.
Even if the air vibration in the tube internal bore is large, resonance in the head tube can be suppressed to an extremely low level, and as a result, good sound quality can be obtained.

Furthermore, by providing a blind hole or a groove in the sound quality adjustment stopper, the weight and sound quality of the stopper can be adjusted, and excellent sound quality suitable for the woodwind instrument can be obtained. In addition, by forming a space inside the airway cylinder with these blind holes and grooves, it is possible to prevent the outside temperature from directly acting on the airway, so even in cold seasons, air cannot be blown into the airway. The exhaled air will not liquefy, and there is no risk of changing the sound quality.

[Brief explanation of drawings]

FIG. 1 is a partially longitudinal side view showing the structure of the woodwind instrument according to the present invention, FIG. 2 is a perspective view of the airway tube,
Figure 3 is a cross-sectional view of the airway tube, Figure 4 is a perspective view of the sound quality adjustment plug provided in the airway tube, and Figure 5A.
B and C are both perspective views showing other embodiments of the sound quality adjustment plug, FIG. 6 is a cross-sectional view taken along the - line in FIG. 1, and FIG. FIG. 8 is a perspective view of the airway tube attached to the head pipe of FIG. 7, FIG. 8 is a sectional view thereof, and FIGS. 9 A and B are both conventional FIG. 3 is a cross-sectional view showing the shape of an airway plug provided in the head tube. 4: Head tube, 9: Airway tube insertion part, 10: Airway tube, 11: Airway, 11a: Airway lower surface, 12: Sound quality adjustment plug, 12a: Airway support surface, 13: Outer tube, 1
6: Space part, 18: Hollow part, 19: Fitting stepped part, 2
0: Rear end surface of sound quality adjustment plug, 21: Flange, 22:
Blind hole, 23: Proximal end, 24: Concave groove, 25: Upper airway wall, 26: Lower airway wall.

Claims (1)

[Scope of Claims] 1. A cylindrical body that extends in the length direction into the distal end insertion portion of the head tube and has an airway or a part of the airway on its upper surface, which is fitted into the rear end of the inner circumferential surface of the cylindrical body. An airway cylinder having a recessed joint part is inserted, and the airway cylinder has a space part for adjusting the required cross-sectional area and weight, and a rear end that fits into the fitting step part of the airway cylinder. substantially reducing the internal volume of the airway tube with mating flanges;
A synthetic resin flute whose sound quality can be freely adjusted, characterized in that a sound quality adjustment plug is tightly fitted and occluded to prevent resonance of the airway cylinder due to air vibrations in the internal bore of the pipe. 2. Claim 1, wherein the space for adjusting the cross-sectional area and weight of the sound quality adjustment plug is a blind hole cut out to a required depth from the tip of the sound quality adjustment plug toward the rear end flange. A synthetic resin flute that allows you to freely adjust the sound quality as described. 3. Claims in which the space for adjusting the cross-sectional area and weight of the sound quality adjustment plug is one or more grooves cut along the length of the surface of the sound quality adjustment plug excluding the flange surface. A flute made of synthetic resin whose sound quality can be freely adjusted as described in item 1.