JP2011186443A - Pipe structure of wind instrument - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wind instrument including a branch pipe in which a mouth piece is replaceable. <P>SOLUTION: The wind instrument is constituted of a mouthpiece and a pipe structure including tapered/straight pipes. The pipe structure is constituted of the branch pipe and a blow member in which two straight pipes are connected in a branching shape. The branch pipe is constituted of a main pipe which is a straight pipe of a cross sectional area Sa, and an auxiliary pipe which is a straight pipe having openings in both ends and connected to a side face of the main pipe. The main pipe is connected to the blow member, at the opening aperture of a connection side to the auxiliary pipe. The branch pipe simulates the resonance characteristics of a tapered pipe having a height La, a distance Ra between the upper base and the vertex, and the cross-sectional area Sa of a hollow part of the upper base. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a wind instrument tube.

  A technique for synthesizing musical sounds by simulating the sound generation mechanism in natural musical instruments is known. Patent Document 1 discloses a technique for approximating and reproducing the resonance characteristics of a resonance tube having a conical surface by branching and connecting two types of straight tubes.

  FIG. 1 is a diagram illustrating approximation of resonance characteristics in a resonance tube having a conical surface. FIG. 1A is a cross-sectional view of a resonance tube 200 having a conical surface 204. The resonance tube 200 has a hollow conical shape with a distance from the conical vertex V in the direction of the arrow D1 along the conical rotation axis X1 by a distance R and a distance from the vertex V in the direction of the arrow D1 ( R + L) is formed in a shape cut out by a plane at a position separated by R + L). The resonance tube 200 has an opening 201 that opens at a distance (R + L) from the vertex V, and an opening 202 that opens at a distance R from the vertex V. The area of the hollow part in the opening 202 is defined as area S, and the area of the hollow part in the opening 201 is defined as area S2. In the resonance tube 200, the area S and the area S2 are different. Thus, the resonance tube 200 is a tube body (hereinafter referred to as a “taper tube”) in which the cross-sectional areas of the opening portions at both ends are different. At this time, the rotation axis X1 is “taper rotation axis”, the opening 201 having a large cross-sectional area is “lower bottom surface”, the opening 202 having a small cross-sectional area is “upper bottom surface”, and the length from the lower bottom surface to the upper bottom surface L is referred to as “height” and the length R is referred to as “distance from the top bottom surface to the apex”.

  In the resonance tube 200, the air column 203 inside the resonance tube 200 resonates due to the sound input from the opening 202. The sound speed of the input sound is c, the air density of the air column 203 is ρ, and the wave number of the input sound is k. When attenuation such as friction between the resonance tube 200 and air is ignored and the end is completely reflected by the opening 201, the input acoustic impedance Z of the resonance tube 200 viewed from the portion indicated by the arrow D1 is expressed by the following equation (1). expressed.

  Here, when a part of Formula (1) is replaced with Formula (2) and Formula (3), Formula (4) is established.

As shown in Expression (4), Z is realized by parallel connection of Z _R and Z _L. Here, Z _R can be approximated as Equation (5) when kR is small.

As shown in Equation (5), the acoustic impedance of a straight tube having a sectional area S and a length L and having an end as an opening is Z _L , and when kR is small, the end is opened with a sectional area S and a length R. The acoustic impedance of the straight tube is Z _R. From the above results, the acoustic impedance of the resonance tube 200 is approximated by the acoustic impedance of the two connected straight tubes. Hereinafter, for convenience of explanation, the case where the acoustic impedances of the two tubular bodies are approximated refers to the case where the two tubular bodies are approximated.

  FIG. 1B is a cross-sectional view of a tube body 210 that approximates the resonance tube 200. The tube body 210 is formed in a shape obtained by cutting a hollow cylinder along a plane orthogonal to the rotation axis X2. The tube 210 has an opening 211 that opens at one end, and an opening 216 that opens at the opposite end. In the tubular body 210, the area of the hollow portions of the opening 211 and the opening 216 is defined as area S. Further, the tubular body 210 has the area S of the hollow portion in the cross section taken along a plane orthogonal to the rotation axis X2 (hereinafter referred to as “cross-sectional area”) at any position. Thus, the tube body 210 is a tube body whose cross-sectional area does not change (hereinafter referred to as “straight tube”). At this time, the rotation axis X2 is referred to as “straight tube rotation axis” and the distance between the openings of the straight tube at both ends is referred to as “straight tube length”.

  The tube 210 is formed in a shape in which a straight tube 214 having a length L and a straight tube 215 having a length R are connected. The straight tube 214 has an opening 211 that opens at one end. The straight tube 215 has an opening 216 that opens at one end. It is assumed that the straight pipe 214 and the straight pipe 215 do not change in cross-sectional area depending on the position of the cross section. Although it is difficult to create a straight tube whose cross-sectional area does not change at all, the cross-sectional area does not change and the error is within the range of effective digits in the approximate expression such as Equation (5). That's fine. In the following description, it is assumed that the cross-sectional area of the straight tube does not change for convenience.

  The straight tube 214 has an air column 213 inside. The air column 213 has a length L in the direction along the rotation axis X2 of the straight tube 214. Hereinafter, for convenience of explanation, the length of the air column in the straight tube in the direction along the rotation axis of the straight tube is referred to as the length of the air column. Also, in the air column inside the tapered tube, the length in the direction along the rotation axis of the tapered tube is called the length of the air column. In the pipe body 210, it is assumed that sound is input to the connecting portion between the straight pipe 214 and the straight pipe 215 indicated by the arrow D2. Here, H which is a positive constant is added to the equation (5).

By multiplying kR by H smaller than 1 to obtain a smaller value kHR and approximating tan (kHR), the accuracy of approximation is improved. When kHR is small, the acoustic impedance when the end is an opening with a straight tube having a cross-sectional area HS and a length HR is expressed by Equation (6). From the above results, the two straight tubes having different thicknesses approximate the resonance tube 200.
FIG. 1C is a cross-sectional view of a tube body 220 that approximates the resonance tube 200. The tubular body 220 is formed in a shape in which a straight tube 224 having a cross-sectional area S and a length L is connected to a straight tube 225 having a cross-sectional area HS and a length HR. The straight tube 224 has an air column having a length L inside. In the tubular body 220, it is assumed that sound is input to the connecting portion between the straight tube 224 and the straight tube 225 indicated by the arrow D2.

  FIG. 2 is a diagram showing the impedance curve IC of the tube body 210 and the tube body 220. The impedance curve IC210 indicates the impedance of the tube body 210, and the impedance curve IC220 indicates the impedance IC of the tube body 220. As shown in FIG. 2, the harmonics of the frequency at the peak of the impedance curve are different between the tube body 210 and the tube body 220. In this case, since the tube body 220 is more out of harmony than the tube body 210, it becomes closer to the characteristics of a tapered tube. Patent Document 1 shows an example in which the above-described resonance tube 200 is approximated by a straight tube and applied to a natural musical instrument.

FIG. 3A is a view showing a wind instrument in which the mouthpiece 300 is attached to the conical tube 204 of FIG. The tube body 200 includes a conical tube 204 and a cork attached to an inlet portion of the conical tube. The tube body 200 is attached to the inside of the mouthpiece through the cork.
FIG.3 (b) is a figure which shows the wind instrument provided with a branch pipe. In this wind instrument, for example, a saxophone, an entire tube having a structure as shown in FIG. 3A in which the tube starts from within the mouthpiece is approximated by a branch tube. Due to such a structure, an opening 800 that penetrates the mouthpiece 300 and the straight tube 231 is formed at the joint between the straight tube 231 and the mouthpiece 300 existing in the mouthpiece 300. A hollow cylindrical attachment 801 is fitted. This attachment 801 is mounted to perform a function as a straight pipe having a length of HR in the above description and a cross-sectional area of HS. Hereinafter, for convenience of explanation, the straight pipe 231 is referred to as a main pipe part, the attachment 801 is referred to as a sub pipe part, and a part constituted by the main pipe part and the sub pipe part is referred to as a branch pipe.
The difference between the sound hole described later and the sub pipe part is that the end part of the sound hole changes between the open state and the closed state for the purpose of obtaining a desired pitch, whereas the end part of the sub pipe part is desired. It is a point that is always open for the purpose of obtaining the pitch of.

Japanese Patent No. 2707913

However, in such a configuration, since the secondary pipe portion is located at a position where the mouthpiece is attached, it is necessary to make a hole in the mouthpiece and pass the secondary pipe portion. For this reason, the mouthpiece is fixed, and there is a disadvantage that the performer cannot replace the mouthpiece with a favorite one.
The present invention has been made in view of the above circumstances, and an object of the present invention is to make it possible to replace a mouthpiece in a wind instrument having a branch pipe.

In order to solve the above-mentioned problem, the present invention is a branch pipe branched into a tubular blow-in part having a detachable part that allows a mouthpiece to be detachable, a tubular main pipe part, and a tubular sub-pipe part, A branch pipe in which the blowing part is connected to a portion where the main pipe part and the sub pipe part are branched, and the main pipe part or the blowing part is a terminal part of the sub pipe part or the sub pipe part. It has a pitch adjustment part for obtaining a desired pitch with a part opened, and when gas is blown from the blowing part, the gas flows into both the main pipe part and the sub pipe part. A wind instrument tube is provided.

  In a preferred aspect of the present invention, the pitch adjusting unit may be a sound hole, a bypass tube, or a slide tube.

  In a preferred aspect of the present invention, the main pipe part and the sub pipe part may be straight pipes.

  In a preferred aspect of the present invention, the detachable portion may be detachable with a mouthpiece using a flaky lead or lip lead.

  In a preferred aspect of the present invention, the blowing section may be a straight pipe.

  According to the present invention, a mouthpiece can be replaced in a wind instrument having a branch pipe.

It is a figure explaining the approximation of the resonance characteristic in a conical resonance tube. It is a figure which shows the impedance curve of a tubular body. It is a figure explaining the wind instrument provided with the wind instrument provided with a taper pipe, and the branch pipe which approximates this. It is a figure explaining a wind instrument provided with a taper tube. It is an external view of the tubular body concerning a 1st embodiment. It is a figure explaining the wind instrument provided with the tubular body which concerns on 1st Embodiment. It is a figure explaining the wind instrument provided with the taper tube from which a taper rate differs. It is a figure explaining the tubular body of the wind instrument which concerns on 2nd Embodiment. It is a figure explaining the tubular body of the wind instrument which concerns on 3rd Embodiment. It is a figure explaining the tubular body of the wind instrument which concerns on 4th Embodiment. 10 is a cross-sectional view of a wind instrument according to Modification 1. FIG. It is a figure explaining the wind instrument provided with the mouthpiece of a lip lead. It is a figure explaining the tubular body of the wind instrument which concerns on the modification 2. FIG. It is a figure explaining the tubular body of the wind instrument which concerns on the modification 3. FIG. It is a figure explaining the tubular body of the wind instrument which concerns on the modification 4. FIG. It is a figure explaining the tubular body of the wind instrument which concerns on the modification 5. FIG. It is a figure which shows the example of the wind instrument to which the modification 6 is applied. It is a figure explaining the tubular body of the wind instrument which concerns on the modification 7. FIG. It is a figure explaining the tubular body of the wind instrument which concerns on the modification 8. FIG. It is a figure explaining the tubular body of the wind instrument which concerns on the modification 9. FIG. It is a figure which shows an example of the wind instrument to which the modification 10 is applied. It is a figure which shows an example of the wind instrument to which the modification 11 is applied. It is a figure explaining the pipe body of the wind instrument before applying the modification 17. FIG. It is a figure which shows the example of the wind instrument to which the modification 17 is applied. It is a figure explaining the tubular body of the wind instrument before applying the modification 18. FIG. It is a figure which shows the example of the wind instrument to which the modification 18 is applied. FIG. 10 is a diagram for explaining a tubular body of a wind instrument according to Modification 21. It is a figure explaining the tubular body of the wind instrument which concerns on the modification 22. FIG. It is a figure explaining the acoustic characteristic of the whole wind instrument concerning 1st Embodiment. It is a figure explaining the acoustic characteristic of the whole wind instrument concerning the modification 11. It is a figure explaining the acoustic characteristic of the whole wind instrument concerning the modification 21. It is a figure explaining the acoustic characteristic of the whole wind instrument concerning the modification 22.

<First Embodiment>
FIG. 4 is a diagram illustrating a wind instrument 100a including a tapered tube 122a. The shape of this wind instrument is exactly the same as in FIG. 3A, but for convenience of explanation, the taper tube is divided into two parts, and the dimensions and symbols are newly assigned. Therefore, S2a is equal to S in FIG. 3A, and the total length of Ra and La is equal to the total length of R and L in FIG. FIG. 4 is a cross-sectional view of the wind instrument 100a. The wind instrument 100a includes a tubular body 120a and a mouthpiece 130a. The tube body 120a is made of metal such as brass or plastic. The tubular body 120a includes a tapered tube 122a and a tapered tube 124a continuous to the tapered tube 122a. Here, the size of the spread per unit length along the rotation axis in the conical shape is referred to as a taper ratio TR, and is used as a scale indicating the degree of the conical shape. At this time, the taper rate of the taper tube 122a and the taper tube 124a is the same. The tapered tube 122a is a tapered tube having a height La, a cross-sectional area Sa on the upper bottom surface, and a length Ra from the upper bottom surface to the apex. The tapered tube 124a has a cross-sectional area Sa on the lower bottom surface and a cross-sectional area S2a on the upper bottom surface. The mouthpiece 130a is attached to the tapered tube 124a from the upper bottom surface side.

  FIG. 5 is an external view of the tubular body 20a according to the first embodiment. In the following drawings including FIG. 5, the dimensions of each component are different from the actual dimensions so that the shape of the component can be easily understood. In FIG. 5, for the sake of easy understanding, the portion showing the cross-sectional area is shown by filling the mesh. The tube body 20a is made of metal such as brass or plastic. The tubular body 20a includes a straight tubular main tube portion 22a having a straight tube axis direction, a straight tubular sub-tube portion 23a having a straight tube axis direction, and a tapered tubular blowing portion 24a. The main pipe portion 22a and the sub pipe portion 23a are connected to each other to constitute a branch pipe 21a branched into the main pipe portion 22a and the sub pipe portion 23a.

  FIG. 6 is a diagram illustrating a wind instrument 10a including the tubular body 20a according to the first embodiment. Descriptions of the same parts as those in FIG. FIG. 6A is a cross-sectional view of the tubular body 20a taken along the cutting line AA shown in FIG. The blowing portion 24a has a hollow connecting portion 24a1 on the lower bottom surface side of the tapered tube, and has an opening portion 24a2 that opens on the upper bottom surface side of the tapered tube. Here, it is assumed that the area of the hollow portion inside the blowing portion 24a in the connecting portion 24a1 shown in FIG. 4 is Sa, and the cross-sectional area of the opening 24a2 is S2a. The cross-sectional area Sa is larger than the cross-sectional area S2a.

  The main pipe portion 22a has an opening 22a1 that opens at one end, and a hollow connection portion 22a2 on the other side. The main pipe part 22a is connected to the blowing part 24a at the connection part 22a2. The cross-sectional area of the main pipe portion 22a is Sa. That is, the cross-sectional area at the connection portion 22a2 is Sa. The main pipe part 22a is connected to the sub pipe part 23a at the side surface of the end part on the connection part 22a2 side. The sub pipe portion 23a is connected to the main pipe portion 22a at one end, and the other end is open. The spaces inside the main pipe portion 22a and the sub pipe portion 23a are connected. That is, the connecting portion 22a2 is located at a portion where the branch pipe 21a branches into the main pipe portion 22a and the sub pipe portion 23a. The branch pipe 21a is connected to the blowing part 24a with the connecting part 22a2 and the connecting part 24a1 facing each other. By being configured in this way, gas (for example, air) blown from one blowing part 24a flows through the main pipe part 22a and the sub pipe part 23a.

FIG.6 (b) is sectional drawing of the wind instrument 10a provided with the tubular body 20a shown to Fig.6 (a). The wind instrument 10a includes a tubular body 20a and a mouthpiece 30a. Mouthpiece 30
“a” is a part of a wind instrument in which a performer applies his / her lips to breathe. The mouthpiece 30a is made of ebonite or the like. The mouthpiece 30a includes a flaky lead 31a formed of a cane or the like. The mouthpiece 30a is used as a woodwind instrument in natural musical instruments. The mouthpiece 30a transmits the vibration of air generated when the performer vibrates the lead 31a to the tube body 20a.

  As for the blowing part 24a, the mouthpiece 30a is mounted | worn with the opening part 24a2. The blowing part 24a has an attachment / detachment part 24a3 that allows the mouthpiece 30a to be attached / detached. A cork 40a is adhered to the blowing part 24a, and the mouthpiece 30a is fitted so as to cover the cork 40a. The pitch of the wind instrument 10a can be finely adjusted by fixing the positions of the blowing part 24a and the mouthpiece 30a and adjusting the length of fitting the mouthpiece 30a. The mouthpiece 30a attached to the blowing part 24a with the cork 40a is detachable. In the wind instrument 10a, since the attaching / detaching part 24a3 and the sub pipe part 23a are at different positions, it is not necessary to form an opening in the mouthpiece 30a unlike the mouthpiece 300 of FIG. For this reason, the mouthpiece used for a normal saxophone etc. can be attached or detached to the attachment / detachment part 24a3.

  The distance from the opening 22a1 to the center line Da of the sub pipe portion 23a is La. Here, in the state where only the opening portion 22a1 is opened in the main pipe portion 22a, and the length of the sub pipe portion 23a is H × Ra and the cross-sectional area is H × Sa, the branch pipe 21a is formed from the upper bottom surface. It is approximated to a tapered tube with a distance to the apex Ra, a cross-sectional area of the upper bottom surface Sa, and a distance between the upper bottom surface and the lower bottom surface La. H is a positive constant smaller than 1 shown in the above equation (6).

FIG. 29 is a diagram illustrating the acoustic characteristics of the wind instrument 10a as a whole according to the first embodiment. A line A in FIG. 29 is an input impedance curve when the mouthpiece 130a shown in FIG. 4 is connected to the conical tube (tube body 120a). A line B in FIG. 29 approximates the wind instrument 100a shown in FIG. 4 in a form in which the secondary pipe part (attachment 801) branches inside the mouthpiece 300 as shown in FIG. 3B, and the main pipe (straight pipe 231). ) Is an input impedance curve when all sound holes (not shown) are closed, which is equal to the cross-sectional area S2a of the upper bottom surface of the conical tube (tube body 120a) shown in FIG. The line C in FIG. 29 is an input impedance when the sound holes (sound holes 25a to be described later) are all closed by approximating the portion after the blowing portion 24a as a branch pipe 21a as shown in FIG. 6B in the first embodiment. It is a curve.
Comparing these, in the first embodiment (line C), as shown in FIG. 3 (b), compared to the conventional branch wind instrument (line B) in which the sub-pipe part branches inside the mouthpiece, the bass sound is particularly low. It can be seen that the peak value of the input impedance curve is close to the wind instrument 100a (line A) shown in FIG.

  As described above, the branch pipe 21a approximates the tapered pipe 122a. For this reason, the tone color of the sound produced by the wind instrument 10a approximates the tone color of the sound produced by the wind instrument 100a. Hereinafter, for convenience of explanation, it is said that two wind instruments are approximated by referring to a relationship in which timbres of sounds to be generated are approximated. The branch pipe 21a is not limited to a shape that approximates the tapered pipe 122a.

Returning to FIG. The main pipe portion 22a has sound holes 25a1, 25a2, 25a3, 25a4, 25a5, 25a6, and 25a7 (hereinafter referred to as “sound holes 25a” unless otherwise distinguished) that open to the side wall from the side close to the opening 22a1. The sound hole 25a is opened and closed by the player's operation. The sound hole 25a obtains a desired pitch by changing the length of the air column that resonates inside the main pipe portion 22a according to the combination of the sound holes 25a that are opened and closed. In the present embodiment, the sound hole 25a corresponds to a “pitch adjustment unit” according to the present invention. For this reason, when the performer operates the sound hole 25a while opening the wind instrument 10a to open and close it, the wavelength of the sound that resonates inside the branch pipe 21a changes, and the pitch that the wind instrument 10a produces changes.

  The wind instrument 10a generates a sound having a preset height (hereinafter referred to as “set sound”) according to the combination of the sound holes 25a to be opened and closed. For example, when the performer operates the wind instrument 10a by opening the sound holes 25a1 to 25a3 and closing the sound holes 25a4 to 25a7, the wind instrument 10a generates a sound of F. This state is said to be performed with the sound hole 25a3 open, and the set sound of the sound hole 25a3 is set to F. Similarly, the sound holes 25a1, 25a2, 25a3, 25a4, 25a5, 25a6, and 25a7 are set to D, E, F, G, A, B, and C, respectively. Each sound hole 25a is formed with an arrangement and a size that can be generated at the pitch of each set sound in a state where the terminal portion of the sub pipe portion 23a is opened. Note that these set sounds are examples, and other sounds may be set in each sound hole 25a, or sounds may be set for other combinations of opening and closing. Further, the number, arrangement, or size of the sound holes 25a may be determined according to the sound or range of sound that the wind instrument produces.

Second Embodiment
FIG. 7 is a cross-sectional view of a wind instrument 100b including taper tubes 122b having different taper ratios. The wind instrument 100b includes a tubular body 120b and a mouthpiece 130b. The tube body 120b is made of metal such as brass or plastic. The tubular body 120b includes a tapered tube 122b and a tapered tube 124b connected to the tapered tube 122b. The tapered tube 122b is a tapered tube having a height of Lb, a cross-sectional area at the upper bottom surface of Sb, and a length from the upper bottom surface to the apex of Rb. The tapered tube 124b has a cross-sectional area Sb at the lower bottom surface and a cross-sectional area S2b at the upper bottom surface. A mouthpiece 130b is attached to the tapered tube 124b from the upper bottom surface side.

  The tapered tube 122b and the tapered tube 124b differ in how the conical shape extends. Specifically, the taper rate of the taper tube 122b is smaller than the taper rate of the taper tube 124b. The taper rate of the tapered tube 124b is obtained by dividing the diameter of the upper bottom surface of the tapered tube 124b by the length R2b from the upper bottom surface to the apex. Further, the taper rate of the tapered tube 122b is obtained by dividing the diameter of the upper bottom surface of the tapered tube 122b by the length Rb from the upper bottom surface to the apex.

  FIG. 8 is a diagram for explaining the tube 20b of the wind instrument 10b according to the second embodiment. In FIG. 8, although not the same as the wind instrument 10a, the symbol “a” of the corresponding configuration is changed to “b”. In this configuration, descriptions of the same features are omitted, and only different features are described. FIG. 8 is a cross-sectional view of the wind instrument 10b. The wind instrument 10b includes a tube body 20b configured by connecting a taper tube and a straight tube, and a mouthpiece 30b corresponding to the mouthpiece 30a. The pipe body 20b includes a branch pipe 21b corresponding to the branch pipe 21a and a blowing part 24b.

  The blowing portion 24b has a hollow connecting portion 24b1 on the lower bottom surface side of the tapered tube, and an opening portion 24b2 that opens on the upper bottom surface side of the tapered tube. The cross-sectional area of the connecting portion 24b1 is Sb, and the cross-sectional area of the opening 24b2 is S2b. The cross-sectional area Sb is larger than the cross-sectional area S2b, and the radius of the connecting portion 24b1 is larger than the radius of the opening 24b2. The blowing part 24b is connected to the branch pipe 21b on the side of the connecting part 24b1 having a large cross-sectional area. The mouthpiece 30b is mounted on the side of the opening 24b2 having a small cross-sectional area. A cork 40b is mounted between the blowing part 24b and the mouthpiece 30b to fill the gap. The mouthpiece 30b attached to the blowing part 24b is detachable. The blowing part 24b has an attaching / detaching part 24b3 for attaching / detaching the mouthpiece 30b. By being configured in this way, the air blown from one blowing part 24b flows through the main pipe part 22b and the sub pipe part 23b.

  Since the wind instrument 10b is provided with the taper tube blowing portion 24b, it is possible to give the player a feeling of wind similar to a wind instrument having a taper tube blowing portion, as compared with the case where the blow portion is a straight tube. In addition, by adjusting the length of the blowing section, it is possible to adjust the feeling of resistance to the breath that the player feels. Furthermore, the wind instrument 10b can also reproduce the sound of a wind instrument having tapered tubes with different taper rates. This will be described below.

  In the wind instrument 10b, the distance from the opening 22b1 to the center line Db of the sub pipe 23b is Lb. Here, when only the opening 22b1 is opened in the main pipe portion 22b, and the length of the sub pipe portion 23b is H × Rb and the cross-sectional area is H × Sb, the branch pipe 21b is formed from the upper bottom surface. It approximates to a tapered tube having a distance to the apex of Rb, a cross-sectional area of the upper bottom surface of Sb, and a distance between the upper and lower bottom surfaces of Lb. H is a positive constant represented by the above-described formula (6). The blowing portion 24b has the same shape as the tapered tube 124b. By configuring as described above, the wind instrument 10b can reproduce the sound of the wind instrument 100b having tapered pipes with different taper rates. The branch pipe 21b is not limited to a shape approximating the tapered pipe 122b.

<Third Embodiment>
FIG. 9 is a diagram for explaining a tubular body 20c of a wind instrument 10c according to the third embodiment. FIG. 9 is a cross-sectional view of the wind instrument 10c. In FIG. 9, the same components as those of the wind instrument 10a are denoted by the same reference numerals and description thereof is omitted. Further, portions having the same characteristics but different in size and quantity from the portion of the wind instrument 10a indicate the corresponding portion of the wind instrument 10a, and description thereof is omitted. The wind instrument 10c is provided with an octave hole 26c in the vicinity of the connecting portion 22c2 of the main pipe portion 22c. When played with the octave hole 26c closed, a standing wave having a wavelength corresponding to the set sound of the sound hole 25a is generated inside the tube 20c. Here, when the octave hole 26c is opened and the wind instrument 10c is played, the standing wave inside the tube 20c is affected and changes to a standing wave whose wavelength is halved. Can produce sounds on an octave.

<Fourth embodiment>
FIG. 10 is a diagram for explaining a tubular body 20d of a wind instrument 10d according to the fourth embodiment. FIG. 10 is a cross-sectional view of the wind instrument 10d. In FIG. 10, the same components as those of the wind instrument 10a are denoted by the same reference numerals, and description thereof is omitted. Further, portions having the same characteristics but different in size and quantity from the portion of the wind instrument 10a indicate the corresponding portion of the wind instrument 10a, and description thereof is omitted. The pipe body 20d includes a main pipe portion 22a, a sub pipe portion 23d, and a blowing portion 24a. The tube body 20d has an octave hole 26d in the vicinity of the connection portion 22a2 of the main tube portion 22a. The sub pipe portion 23d is formed in a straight tube shape, and is connected to the main pipe portion 22a at one end portion and is open at the other end portion. The spaces inside the main pipe portion 22a and the sub pipe portion 23d are connected. The sub pipe portion 23d has an opening / closing hole 27d on the side wall that opens and closes when operated by a player. The opening / closing hole 27d is provided at a position having a length Ld from the end of the sub pipe portion 23d on the main pipe portion 22a side. Here, the distance between the center line Dd of the sub-pipe portion 23d and the sound hole 25a is Lt (hereinafter referred to as “sound hole distance Lt”). For example, the distance between the sound hole 25a7 and the center line Dd is referred to as Lt7. The sound hole distance Lt represents the length of the resonating air column inside the main pipe portion 22a.

Here, in the wind instrument 10d, when the performance is performed with the sound holes 25a open, there are cases where the resonance of the even-order mode in the tube 20d is strong and weak. For example, the sound holes 25a1 to 25a5 are the former. In this case, by opening the octave hole 26d, a sound one octave higher than the set sound set in each sound hole 25a can be easily obtained. On the other hand, in the sound holes 25a6 to 25a7, since the sound hole distance Lt is shorter than the length of the sub pipe portion 23d, the resonance of the even-order mode in the tubular body 20d is weakened. Furthermore, the resonance frequency of the secondary mode is higher than the double frequency of the primary mode, which is one octave above the resonance frequency of the primary mode. Therefore, when the performer plays the wind instrument 10d with the octave hole 26d and the sound holes 25a6 or 25a7 open, it is difficult to generate a sound one octave higher than the set sound. Also, when a tone is pronounced, the pitch becomes high and a difference from the timbre in other tone ranges occurs.

  When the performer generates a sound one octave higher than the set sound set in the sound hole 25a6 or 25a7, the performer plays the wind instrument 10d with the octave hole 26d and the opening / closing hole 27d opened. In this case, the length of the resonating air column in the sub-pipe portion 23d is shorter than when performing with the open / close hole 27d closed. In this way, the opening / closing hole 27d changes the length of the resonating air column inside the sub-pipe portion 23d according to the opening / closing of the opening / closing hole 27d. In the present embodiment, the opening / closing hole 27d corresponds to the “sub pipe changing portion” according to the present invention. At this time, the sub pipe portion 23d functions substantially the same as the sub pipe portion having a length Ld. For this reason, the sound hole distance Lt is not in a short state with respect to the length Ld of the sub-tube portion, and the resonance of the even-order mode in the tubular body 20d becomes strong. The wind instrument 10d can easily generate a sound one octave above the set sound range set in all the sound holes 25a, and is generated with a suitable pitch and tone color.

  When the performer performs with the octave hole 26d closed, the wind instrument 10d generates a set sound set in each sound hole 25a. In this case, when the opening / closing hole 27d is opened / closed, the tone of the sound to be generated changes. By configuring as described above, the wind instrument 10d can change the pitch and tone during the performance by operating the opening / closing hole 27d provided in the sub-pipe portion 23d. Note that the wind instrument 10d further includes an instruction unit for instructing sound generation over one octave, and either the octave hole 26d or the opening / closing hole 27d or the opening hole 27d, depending on the instruction content of the instruction unit and the opening / closing state of the sound hole 25a. You may further provide the opening-closing part which opens and closes both. A plurality of opening / closing holes 27d may be provided. In this case, if the performer performs in a state where each of the opening / closing holes 27d is opened / closed so that the length of the air column resonating inside the sub-pipe portion 23d is suitable according to the opened / closed state of the sound hole 25a. Good. Alternatively, the same effect can be obtained by closing one end of the sub pipe portion 23d and opening one or more arbitrary sound holes among the plurality of opening / closing holes 27d provided in the middle of the sub pipe portion. Also good. That is, the sub-pipe part 23d may be in a state where the terminal part or a part thereof is opened.

As mentioned above, although embodiment of this invention was described, this invention can be implemented also with another form. <Modification 1>
In the first, third, and fourth embodiments described above, the tapered tubular blowing portion 24a is used, but a straight tubular blowing portion may be used. In this case, the tubular body is composed of a straight tubular main pipe part, a secondary pipe part and a blowing part. The wind instrument having this tubular body approximates the wind instrument having the tapered tubes 122a and 124a shown in FIG.

  FIG. 11 is a cross-sectional view of a wind instrument 10e according to the first modification. In FIG. 11, the same components as those of the wind instrument 10a are denoted by the same reference numerals, and description thereof is omitted. In FIG. 11, the symbol “a” of the corresponding configuration is changed to “e” although it is not the same as the wind instrument 10 a. In this configuration, descriptions of the same features are omitted, and only different features are described. The wind instrument 10e includes a tube 20e and a mouthpiece 30e, which are configured by connecting straight tubes. The tube body 20e is formed of a metal such as brass. The tubular body 20e includes a straight tubular blowing portion 24e. A cork 40e formed to cover the outer surface of the blowing part 24e is bonded to the blowing part 24e. The blowing part 24e is equipped with a mouthpiece 30e via a cork 40e. The blowing part 24e has an opening 24e2 that opens to the mouthpiece 30e side. The mouthpiece 30e attached to the blowing part 24e to which the cork 40e is bonded is detachable. A part of the blowing part 24e where the mouthpiece 30e is attached and detached is referred to as an attaching / detaching part 24e3. Note that the mouthpiece 30e may be fixed to the tube body 20e.

The blowing part 24e has a connection part 24e1 at the end opposite to the opening part 24e2. The cross-sectional area of the connecting portion 24e1 is Sa. The blowing part 24e is connected to the branch pipe 21a with the connecting part 24e1 and the connecting part 22a2 of the main pipe part 22a facing each other. The wind instrument 10e configured as described above approximates a wind instrument in which a blowing portion having the same shape as the blowing portion 24e is connected to the tapered tube 122a shown in FIG. Thus, the blowing part may be a tubular shape such as a tapered tubular shape or a straight tubular shape. Note that the blowing portion may have a shape in which a part is a tapered tube and a part is a straight tube and these are connected.

FIG. 30 is a diagram for explaining acoustic characteristics of the entire wind instrument 10e according to the first modification. A line D in FIG. 30 is an input impedance curve when the blowing portion 24a and the like as shown in FIG. 6B in the first embodiment described above is approximated as a branch pipe 21a and all the sound holes 25a are closed. . A line E in FIG. 30 is an input impedance curve in the case where the blowing portion 24a is replaced with a straight tube (blowing portion 24e) as shown in FIG.
When these are compared, in the modification 1 (line E), although the blowing part 24e is a simple shape like a straight pipe, embodiment (line D) branched after the blowing part 24a like FIG.6 (b). Therefore, it can be seen that the wind instrument 10e in the modified example 1 has good acoustic characteristics like the wind instrument 10a in FIG. 6B.
Thus, by making the shape of the blowing part including the detachable part into a straight tube, it is possible to simplify the manufacture of the musical instrument while satisfying desired acoustic characteristics as much as possible.

<Modification 2>
In the embodiment described above, a single lead mouthpiece having a single piece of lead is used for the wind instrument, but a double lead or lip lead mouthpiece may be used. Hereinafter, examples of wind instruments to which the second modification is applied will be described with reference to the drawings.

  FIG. 12 is a diagram illustrating a wind instrument 100f including a lip reed mouthpiece. FIG. 12 is a cross-sectional view of the wind instrument 100f. The wind instrument 100f includes a tubular body 120f, a mouthpiece 130f, and a mouthpiece mounting part 132f. A mouthpiece attachment part 132f is bonded to the tube body 120f. The tube body 120f, the mouthpiece 130f, and the mouthpiece mounting part 132f are made of metal such as brass. The tubular body 120f includes a tapered tube 122f and a tapered tube 124f continuous to the tapered tube 122f. That is, each of the tapered tubes 122f and 124f is a part of the tube body 120f. The tapered tube 122f is a tapered tube having a height Lf, an upper bottom cross-sectional area Sf, and a length from the upper bottom surface to the apex Rf. The tapered tube 124f is a tapered tube having a height L2f, an upper bottom cross-sectional area S2f, a lower bottom cross-sectional area Sf, and a length from the upper bottom surface to the apex R2f. In this example, the taper rate of the taper tube 124f is smaller than the taper rate of the taper tube 122f.

  FIG. 13 is a diagram for explaining a tubular body 20f of a wind instrument 10f according to the second modification. In FIG. 13, configurations having the same characteristics as the wind instrument 100f are shown except for the hundreds of reference numerals of the corresponding configurations, and description of the features is omitted. FIG. 13 is a cross-sectional view of the wind instrument 10f. The wind instrument 10f includes a tube 20f and a mouthpiece 30f, which are configured by connecting a tapered tube and a straight tube. The tube 20f is formed of a metal such as brass. The tubular body 20f includes a tapered tubular blowing portion 24f. The blowing portion 24f has a hollow connection portion 24f1 on the lower bottom surface side of the tapered tube and an opening portion 24f2 that opens on the upper bottom surface side of the tapered tube. The connecting portion 24f1 has a cross-sectional area Sf, and the opening 24f2 has a cross-sectional area S2f. The cross-sectional area Sf is larger than the cross-sectional area S2f.

The blowing part 24f has an attaching / detaching part 24f3 for mounting the mouthpiece 30f on the opening 24f2 side. A mouthpiece attachment component 32f is attached to the attachment / detachment portion 24f3. The mouthpiece 30f is fitted into the mouthpiece attachment part 32f and fixed in position. The mouthpiece 30f is a part of a wind instrument in which a performer blows his / her lips. The mouthpiece 30f is made of brass or the like. The vibration of the air generated when the performer vibrates the lips applied to the mouthpiece 30f becomes a sound source of the wind instrument 10f. The mouthpiece 30f inputs this air vibration to the blowing part 24f. In the wind instrument 10f, since the attaching / detaching portion 24f3 and the sub-pipe portion 23f are at different positions, it is not necessary to form an opening in the mouthpiece 30f unlike the mouthpiece 300 in FIG. For this reason, the mouthpiece used for the normal trumpet etc. can be attached or detached to the attachment / detachment part 24f3.

  The tube body 20f includes a branch pipe 21f branched into a straight tubular main pipe portion 22f and a straight tubular sub pipe portion 23f. The main pipe portion 22f has an opening 22f1 that opens at one of both ends, and has a hollow connection portion 22f2 at the other. The main pipe portion 22f is connected to the sub pipe portion 23f at the side surface of the end portion on the connection portion 22f2 side. The sub pipe portion 23f is connected to the main pipe portion 22f at one end portion, and the other end portion is open. The spaces inside the main pipe portion 22f and the sub pipe portion 23f are connected. That is, the connecting portion 22f2 is located at a portion where the branch pipe 21f branches into the main pipe portion 22f and the sub pipe portion 23f. The branch pipe 21f is connected to the blowing part 24f with the connecting part 22f2 and the connecting part 24f1 facing each other. The distance from the opening 22f1 to the center line Df of the sub pipe portion 23f is Lf. Here, since the branch pipe 21f approximates a taper pipe whose distance from the upper bottom surface to the apex is Rf and the cross-sectional area of the upper bottom surface is Sf, the sub pipe portion 23f has a length H × Rf and a cross-sectional area. It is formed to be H × Sf. H is a positive constant represented by the above-described formula (6).

  By being configured as described above, the wind instrument 10f can sound with a timbre that approximates the wind instrument 100f including a lip lead mouthpiece and a resonance tube having a shape in which two cones having different taper rates are continuous. . In the present embodiment, an example in which the blowing portion is a tapered pipe is shown, but it may be realized by a straight pipe. In the present embodiment, an example in which the main pipe portion and the sub pipe portion of the straight pipe are combined has been shown, but either one or both may be realized by a tapered pipe.

<Modification 3>
In the third embodiment described above, the octave hole 26c is arranged in the main pipe portion 22c, but it may be provided in another location of the pipe body 20c. For example, when the sound hole distance Lt7 is shorter than the length of the sub pipe portion, the node of the standing wave in the second mode can be formed inside the sub pipe portion 23a. In this case, the sound one octave higher than the set sound set in the sound hole 25a7 cannot be generated even if the octave hole 26c disposed near the opening 22c2 of the main pipe portion 22c is opened. In this case, an octave hole may be provided in the sub pipe portion. Moreover, you may provide an octave hole in both a main pipe part and a sub pipe part.

  FIG. 14 is a view for explaining a tubular body 20g of a wind instrument 10g according to the third modification. FIG. 14 is a cross-sectional view of the wind instrument 10g. In FIG. 14, the same components as those of the wind instrument 10c are denoted by the same reference numerals, and description thereof is omitted. The wind instrument 10g has an octave hole 26g on the side surface of the main pipe portion 22a on the blowing portion 24a side. The wind instrument 10g has an octave hole 26g2 on the side surface of the sub pipe portion 23g. When the wind instrument 10g is played with the octave holes 26g and 26g2 closed, a standing wave having a wavelength corresponding to the set sound of the sound hole 25g is generated inside the tube 20g. When played with the octave hole 26g closed and the octave hole 26g opened, the wind instrument 10g produces a sound one octave higher than the set sound set in the sound holes 25a1 to 25a7. On the other hand, when played with the octave hole 26g2 opened and the octave hole 26g closed, the wind instrument 10g produces a sound one octave higher than the set sound set in the sound hole 25a7. By configuring as described above, the wind instrument 10g operates the octave hole even when the effective distance of the sound hole is short compared to the length of the sub pipe part, so that the set sound set in the sound hole can be obtained. Can sound one octave above.

<Modification 4>
In the third embodiment or the third modification described above, the octave holes 26c and 26g2 are provided in the main pipe portion 22c or the sub pipe portion 23g, respectively, but may be provided in other portions of the pipe bodies 20c and 20g. For example, when the sound hole distance Lt7 is shorter than the length of the blowing part 24a, the standing wave node of the second mode can be formed inside the blowing part 24a. In this case, the set sound C of the sound hole 25a7 cannot be generated even if the octave hole 26c disposed near the opening 22c2 of the main pipe portion 22c is opened. In this case, you may provide an octave hole in a blowing part. Moreover, you may provide an octave hole in a main pipe part and a blowing part or a main pipe part, a sub pipe part, and a blowing part.

  FIG. 15 is a diagram for explaining a tubular body 20h of a wind instrument 10h according to Modification 4. FIG. 15 is a cross-sectional view of the wind instrument 10h. The wind instrument 10h includes a tube body 20h and a mouthpiece 30h that are configured by connecting a tapered tube and a straight tube. The tube body 20h is formed of a metal such as brass. The tube body 20h includes a tapered tubular blowing portion 24h. The blowing portion 24h has a hollow connecting portion 24h1 on the lower bottom surface side of the tapered tube, and has an opening portion 24h2 that opens on the upper bottom surface side of the tapered tube. The cross-sectional area of the connecting portion 24h1 is Sh, and the cross-sectional area of the opening 24h2 is S2h. The cross-sectional area Sh is larger than the cross-sectional area S2h, and the radius of the connecting portion 24h1 is larger than the radius of the opening 24h2. A mouthpiece 30h is attached to the blowing portion 24h on the opening portion 24h2 side having a small radius.

  Between the blowing part 24h and the mouthpiece 30h, a cork 40h is attached to fill a gap. The mouthpiece 30h and the cork 40h attached to the blowing part 24h are detachable. The blowing part 24h has an attaching / detaching part 24h3 for attaching / detaching the mouthpiece 30h. The mouthpiece 30h may be fixed to the tube body 20h. Here, the cross-sectional area Sh is assumed to be larger than the cross-sectional area Sa of the wind instrument 10a. In this case, the blowing part 24h is larger than the blowing part 24a in the wind instrument 10a, the mouthpiece 30h is larger than the mouthpiece 30a, and the blowing part 24h has an opening 24h2 and a connecting part 24h1 compared to the blowing part 24a. is seperated. For this reason, compared with the wind instrument 10a, the connection part 24h1 and the tip of the mouthpiece (the end on the side not connected to the blowing part 24h of the mouthpiece 30h) are separated. The blowing part 24h is provided with an octave hole 26h on the side surface closer to the connecting part 24h1 than the attaching / detaching part 24h3.

  The pipe body 20h includes a branch pipe 21h branched into a straight tubular main pipe portion 22h and a straight tubular sub pipe portion 23h. The main pipe portion 22h has an opening 22h1 that opens at one of both ends, and has a hollow connection portion 22h2 at the other. The main pipe portion 22h is connected to the sub pipe portion 23h at the side surface of the end portion on the connection portion 22h2 side. The sub pipe portion 23h is connected to the main pipe portion 22h at one end, and the other end is open. The spaces inside the main pipe portion 22h and the sub pipe portion 23h are connected. That is, the connecting portion 22h2 is located at a portion where the branch pipe 21h branches into the main pipe portion 22h and the sub pipe portion 23h. The branch pipe 21h is connected to the blowing part 24h with the connecting part 22h2 and the connecting part 24h1 facing each other. The distance from the opening 22h1 to the center line Dh of the sub pipe portion 23h is Lh. Here, since the branch pipe 21h approximates a tapered pipe whose distance from the upper bottom surface to the apex is Rh and whose upper cross-sectional area is Sh, the sub pipe portion 23h has a length H × Rh and a cross-sectional area. It is formed to be H × Sh. H is a positive constant represented by the above-described formula (6).

With the above configuration, the wind instrument 10h can generate a sound one octave higher than the set sound set in the sound hole 25h when played with the octave hole 26h opened. As described above, in a wind instrument having a branch pipe, the octave hole may be arranged at a position corresponding to the length of the air column where the branch pipe in the main pipe section, the sub pipe section or the blowing section resonates. In this case, if the octave hole is provided in the blowing part 24h or the sub pipe part 23h when the length of the resonating air column changed by the sound hole 25h (pitch adjusting part) becomes shorter than a predetermined length, Good. In addition, when there are a plurality of octave holes, an instruction unit for instructing opening / closing of the octave holes and an opening / closing unit for opening / closing the octave holes according to the states of the instruction unit and the sound hole 25h (pitch adjustment unit) are provided. Also good.

<Modification 5>
In the fourth embodiment described above, the pitch and tone of the wind instrument 10d are changed during the performance by operating the opening / closing hole 27d, but the pitch of the wind instrument 10d is changed by changing the length of the sub-pipe section. The tone may be changed during the performance.

  FIG. 16 is a diagram for explaining a tubular body 20i of a wind instrument 10i according to Modification 5. In FIG. 16, the same components as those of the wind instrument 10a are denoted by the same reference numerals and description thereof is omitted. The tube body 20i has an octave hole 26i in the vicinity of the connection portion 22a2 of the main tube portion 22a. The sub pipe part 23i has the fixing | fixed part 23i1 fixed to the main pipe part 22a. The fixing portion 23i1 is formed in a straight tubular shape with brass or the like. The sub-tube portion 23i is provided with a straight tubular slide tube 23i2 formed of brass or the like. The slide tube 23i2 is inserted inside the fixed portion 23i1 and moves within a predetermined range. In FIG. 16A, the slide tube 23i2 is located at a position where the length of the sub-pipe portion 23i is H × Ra. In FIG. 16B, the slide tube 23i2 moves, and the slide tube 23i2 is located at a position where the length of the sub-tube portion 23i is Li. The slide tube 23i2 moves to change the length of the resonating air column inside the sub-tube portion 23i. In the present modification, the fixing portion 23i1 and the slide tube 23i2 correspond to the “sub-tube changing portion” according to the present invention.

  For example, the performer performs the performance by opening the octave hole 26i by operating the wind instrument 10i in the state of FIG. In this case, in the sound range of the set sound of the sound hole 25a6 or 25a7, as described above, the resonance of the even-order mode in the tubular body 20d becomes weak, and the resonance frequency of the second-order mode is one octave above the first-order mode. The resonance frequency is significantly higher than the resonance frequency twice that of the corresponding first mode. When the performer operates the slide tube 23i2 to bring the wind instrument 10i into the state shown in FIG. 16B, the length of the resonating air column inside the sub-pipe portion 23i changes shorter than that in the state shown in FIG. . At this time, the sound hole distance Lt is sufficiently longer than the length Li of the sub-pipe portion 23i, and the even-order mode resonance in the tubular body 20i is strengthened. As a result, the wind instrument 10i can easily generate a sound one octave above the set sound range set in all the sound holes 25a, and is generated with a suitable pitch and tone color. By configuring as described above, the wind instrument 10i can adjust the pitch and tone during the performance by operating the slide tube 23i2 provided in the sub-pipe portion 23i.

  Further, the sub-pipe section may include a detour section having a detour pipe described in Modification 6 described later. In this case, the detour unit switches whether to route the route inside the sub pipe unit to the detour tube. The detour unit switches the presence / absence of this route and changes the length of the resonating air column inside the sub-pipe portion. As a result, the length of the resonating air column inside the main pipe portion is not short with respect to the length of the resonating air column inside the sub pipe portion, and 1 in all the set sound ranges that the wind instrument sounds. The sound on the octave is easily pronounced, and it is pronounced with a suitable pitch and tone.

  Further, the sub-pipe section may be configured to change its inner diameter, and the amplitude of the resonating air column inside the sub-pipe section may be changed. As a configuration for changing the inner diameter, for example, a configuration in which the inner tube can be fitted into the sub-tube portion so as to reduce the inner diameter may be used. With this configuration, the timbre can be adjusted.

<Modification 6>
In the above-described embodiment, the pitch generated by the sound hole is changed, but the pitch may be changed using a detour portion. For example, a bypass unit used in a trumpet or the like is used. Hereinafter, an example of a wind instrument to which the modified example 6 is applied will be described with reference to the drawings.

  FIG. 17 is a plan view of a wind instrument 10j according to Modification 6. In FIG. 17, the same components as those of the wind instrument 10a are denoted by the same reference numerals, and description thereof is omitted. In FIG. 17, portions having the same characteristics but different in size and quantity from the portions of the wind instrument 10 a indicate the corresponding portions of the wind instrument 10 a and will not be described. The wind instrument 10j includes a tube body 20j to which a straight tubular tube body is connected and a mouthpiece 30a. The pipe body 20j includes a straight tubular main pipe part 22j, a sub pipe part 23j corresponding to the sub pipe part 23a, and a blowing part 24j corresponding to the blowing part 24a. In the wind instrument 10j, the main pipe portion 22j is longer and the cross-sectional area is smaller than that of the wind instrument 10a. That is, the wind instrument 10j approximates a wind instrument having a tapered tube whose upper bottom surface is narrower and longer than the wind instrument 10a.

  The main pipe section 22j has detour sections 28j1, 28j2, 28j3, 28j4, 28j5, 28j6, 28j7 (hereinafter referred to as “detour section 28j” if not distinguished). The bypass section 28j includes a bypass pipe having a path (hereinafter referred to as "detour path") that bypasses longer than a path formed by the space inside the main pipe section 22j (hereinafter referred to as "main path"). The detour unit 28j includes a detour key for the performer to perform a detour operation and a valve for switching the path in conjunction with this operation. When the detour key is operated, the detour valve (rotary valve in the figure) is moved (rotated) to switch presence / absence of the main route to the detour route. That is, the detour part 28j changes the length of the air column that resonates inside the main pipe part 22j to obtain a desired pitch. In the present embodiment, the bypass unit 28j corresponds to a “pitch adjustment unit” according to the present invention. For this reason, when the performer operates the detour unit 28j while playing the wind instrument 10j to switch between the main path and the detour path, the wavelength of the sound that resonates inside the branch pipe 21j changes, and the pitch generated by the wind instrument 10j is changed. Changes. The bypass unit 28j is designed to have a preset pitch when each is operated. The main pipe portion 22j is provided with an all-tone trill key TC1 and a semitone trill key TC2 (hereinafter referred to as “trill key TC” if not distinguished). The trill key TC changes the whole tone or semitone when operated, regardless of the operation state of the bypass key of the bypass unit 28j.

In order to maintain consistency with the fingering operation of a conventional woodwind instrument, the detour unit may be configured such that the space inside the main tube unit passes through the detour path when not being operated. In this case, when the performer operates the bypass section, the space inside the main pipe section that has been bypassed is shortly connected, the length of the air column is shortened, and the pitch of the sound is increased. Alternatively, a bypass portion may be provided in the sub-tube portion so that the length of the resonating air column inside the sub-tube portion is changed during performance. In this case, the detour part corresponds to a “sub pipe changing part” according to the present invention.
Since the wind instrument 10j whose pitch is controlled by the bypass unit 28j does not open a sound hole during performance, if a mute is provided in the opening 22j1 and the opening 23j1, a silent performance or a mute performance can be realized. Note that mute may also be applied in other embodiments or modifications.
In FIG. 17, a path switching mechanism using a rotary valve used for a brass instrument such as a French horn is used. However, a path switching mechanism using a piston valve used for a brass instrument such as a normal trumpet may be used.

<Modification 7>
In the embodiment described above, the pitch is changed by the sound hole provided in the main pipe, but the pitch may be changed by a moving straight pipe provided in the main pipe. For example, a slide tube used for a trombone or the like may be provided.

  FIG. 18 is a diagram for explaining a tubular body 20k of a wind instrument 10k according to Modification 7. In FIG. 18, the same components as those of the wind instrument 10a are denoted by the same reference numerals, and description thereof is omitted. The tubular body 20k is composed of a branch pipe 21k composed of a main pipe portion 22k and a sub pipe portion 23a, and a blowing portion 24a. The main pipe part 22k has a fixing part 22k3 that is connected and fixed to the sub pipe part 23a and the blowing part 24a. The fixing portion 22k3 is formed in a straight tubular shape with brass or the like. The main tube portion 22k is provided with a straight tubular slide tube 22k4 made of brass or the like. The slide tube 22k4 is inserted inside the fixed portion 22k3 and moves within a predetermined range. The slide tube 22k4 has an opening 22k1 that opens at an end opposite to the fixed portion 22k3. The tube body 20k has an octave hole 26k in the vicinity of the opening 22k2 of the main tube portion 22k.

  In FIG. 18A, the slide tube 22k4 is located at a position where the length of the main tube portion 22k is La. In FIG. 18B, the slide tube 22k4 moves, and the slide tube 22k4 is located at a position where the length of the main tube portion 22k is Lk. By being configured as described above, the fixed portion 22k3 and the slide tube 22k4 change the length of the main tube portion 22k to change the length of the air column that resonates inside the main tube portion 22k to obtain a desired pitch. . Therefore, when the performer operates the slide tube 22k4 while playing the wind instrument 10k to change the length of the main pipe portion 22k, the wavelength of the sound that resonates inside the branch pipe 21k changes, and the sound that the wind instrument 10k produces The height changes. In the present modification, the fixed portion 22k3 and the slide tube 22k4 correspond to the “pitch adjusting portion” according to the present invention. According to this configuration, woodwind instruments such as conventional saxophones can only be played in a jumping manner, whereas they can be used for portamento performances in which the pitch is played continuously like a brass instrument trombone. There is a merit.

<Modification 8>
In the embodiment described above, a straight straight tube having a straight tube axis direction is used, but a straight tube having a bent tube may be used. For example, you may use the straight pipe | tube bent in any of the main pipe part, the sub pipe part, or the blowing part. In addition, you may use the straight pipe | tube bent in some of them.

  FIG. 19 is a diagram for explaining a tubular body 20m of a wind instrument 10m according to Modification 8. In FIG. 19, the same components as those of the wind instrument 10a are denoted by the same reference numerals and description thereof is omitted. The pipe body 20m includes a main pipe part 22m, a sub pipe part 23m, and a blowing part 24a. The main pipe portion 22m and the sub pipe portion 23m constitute a branch pipe 21m that branches. The main pipe portion 22m and the sub pipe portion 23m are straight pipes having a curved rotation axis. The main pipe portion 22m has an opening 22m1 that opens at one end, and a hollow connection portion 22m2 at the other side. The main pipe portion 22m is connected to the blowing portion 24a at the connection portion 22m2. The cross-sectional area of the main pipe portion 22m is Sa. That is, the cross-sectional area at the connection portion 22m2 is Sa. The main pipe portion 22m is connected to the sub pipe portion 23m at the side surface of the end portion on the connection portion 22m2 side. In the main pipe portion 22m, a length of a center line 22Lm connecting the center of the cross section at the connection portion 22m2 to the center of the cross section at the opening portion 22m1 is a length La.

  The sub pipe portion 23m has an opening 23m1 that opens at one end, and a hollow connection portion 23m2 at the other side. The sub pipe portion 23m is connected to the main pipe portion 22m at the connection portion 23m2. The spaces inside the main pipe portion 22m and the sub pipe portion 23m are connected. That is, the connecting portion 22m2 is located at a portion where the branch pipe 21m branches into the main pipe portion 22m and the sub pipe portion 23m. In the sub pipe portion 23m, a length of a center line 23Lm connecting the center of the cross section at the connection portion 23m2 to the center of the cross section at the opening 23m1 is a length H × Ra. The branch pipe 21m is connected to the blowing portion 24a with the connecting portion 22m2 and the connecting portion 24a1 facing each other. By configuring as described above, the wind instrument 10m can reproduce the pitch and tone of the wind instrument 100a shown in FIG. 4 in a more compact manner.

<Modification 9>
In the wind instrument according to the embodiment and the modification described above, the sub pipe portion is connected to the side wall of the main pipe portion, but the mouth piece side opening portion of the main pipe portion and the opening portion of the sub pipe portion may be arranged side by side. In this case, the shapes of the main pipe portion and the sub pipe portion may be different from the cylinder.
In the conventional branch wind instrument in which the sub pipe portion branches in the mouthpiece as shown in FIG. 3B, the blow pipe inlet portion (the upper and lower surfaces of the conical tube 204) of the wind instrument 200 before approximation as shown in FIG. ) And the cross-sectional area S of the main pipe part (straight pipe 231) are substantially equal, the sum of the cross-sectional area S of the main pipe part (straight pipe 231) and the cross-sectional area HS of the sub pipe part (attachment 801) is Since it becomes larger than the cross-sectional area S of the inlet part of the blowing pipe, the resistance at the time of blowing is smaller than that of FIG. If the resistance to blowing is low, there may be a negative effect such as a long tone in which the sound is blown while continuing to breathe. The modified example 9 is an example for improving this.

  FIG. 20 is a diagram for explaining a tubular body 20n of a wind instrument 10n according to Modification 9. FIG. 20A is a cross-sectional view of the wind instrument 10n. The wind instrument 10n is composed of a tube 20n and a mouthpiece 30n that are configured by connecting two cylindrical tubes. The tube body 20n is formed of a metal such as brass. The tube body 20n is configured by connecting a main tube portion 22n and a sub tube portion 23n, which are two cylindrical tubes. The main pipe portion 22n is a cylindrical pipe having a length L and a cross-sectional area Sn of the hollow portion. The sub-pipe portion 23n is a tubular tube having a length of H × R and a hollow portion having a cross-sectional area of H × Sn. The main pipe portion 22n has openings 22n1 and 22n2 that open at the ends in the longitudinal direction. The sub-pipe portion 23n has openings 23n1 and 23n2 that open at the ends in the longitudinal direction. The opening 22n2 and the opening 23n2 are located on the same plane, and each faces the mouthpiece 30n. The mouthpiece 30n is connected to the main pipe portion 22n and the sub pipe portion 23n by inserting the cork 40n.

FIG. 20B is a cross-sectional view taken along the cutting line BB in FIG. The hollow part of the main pipe part 22n and the hollow part of the sub pipe part 23n are each formed so that the cross section forms a part of a circle, and the cross section S is substantially equal to the shape of the circle. By configuring as described above, the wind instrument 10n approximately approximates a wind instrument having a tapered tube with a cross-sectional area of the hollow portion of the upper bottom surface of S and a length from the upper bottom surface to the apex of R.
The sum of the cross-sectional area Sn of the hollow portion of the main pipe portion 22n and the cross-sectional area H × Sn of the hollow portion of the sub-pipe portion 23n is the inlet portion (conical tube 204) of the blowing portion of the wind instrument 200 before approximation shown in FIG. Is substantially equal to the cross-sectional area S of the upper bottom surface), so that in this type of tube, in addition to the effects obtained in other forms, in comparison with other types of tubes, in comparison with conventional acoustic instruments Also, it is possible to keep the feeling of blowing well.

Further, the wind instrument 10n is not bulky and has a high capacity because the sub-pipe part 23n is disposed along the main pipe part 22n. The cross section of the main pipe part and the sub pipe part may be circular and the gap near the connection part may be filled with a member such as cork or rubber so that the breath does not escape from the gap.
In this example, the sum of the cross sectional area Sn of the hollow portion of the main pipe portion 22n and the cross sectional area H × Sn of the hollow portion of the sub pipe portion 23n is the inlet portion of the blowing portion of the wind instrument 200 before approximation shown in FIG. Although set so as to be substantially equal to the cross-sectional area S of (the upper bottom surface of the conical tube 204), the cross-sectional area Sn of the hollow portion of the main pipe portion 22n and the cross-sectional area of the hollow portion of the sub pipe portion 23n are adjusted in order to adjust the feeling of wind. You may set so that the sum of HxSn may become smaller than the cross-sectional area S of the inlet part (upper bottom face of the conical tube 204) of the blowing part of the wind instrument 200 before the approximation shown to Fig.3 (a).

<Modification 10>
In the wind instrument according to the above-described embodiment, an opening opening is provided at one end portion of the main pipe portion, but a tubular body having a taper ratio such as a bell or a taper tube may be provided at this end portion. For example, in the main pipe part 22a, a bell is connected to the side opposite to the side to which the blowing part 24a is connected. In this case, the amount of sound to be generated is increased by the function of the bell. Further, the main pipe portion may be configured by connecting a tapered pipe having a narrowed tip instead of the bell. In this case, the amount of sound produced is reduced by the action of the tapered tube. By being configured as described above, the tubular body having the taper ratio changes the amount of sound output from the branch pipe 21a to the outside.

  FIG. 21 is a diagram illustrating an example of a wind instrument to which the tenth modification is applied. In FIG. 21, the same components as those of the wind instrument 10a are denoted by the same reference numerals and description thereof is omitted. FIG. 21A is a cross-sectional view of a wind instrument 10p having a bell 50p. The wind instrument 10p includes a tubular body 20a, a mouthpiece 30a, a cork 40a, and a bell 50p. The bell 50p is a tapered tubular body made of a metal such as brass or a plastic and having a taper rate continuously changing. The bell 50p is connected to the tubular body 20a with the side of the hollow portion having a smaller area facing the opening 22a1. By being configured as described above, the sound resonated inside the tube 20a is amplified and transmitted to the outside.

  FIG. 21B is a cross-sectional view of a wind instrument 10q having a tapered tube 50q. The wind instrument 10q includes a tubular body 20a, a mouthpiece 30a, a cork 40a, and a tapered tube 50q. The taper pipe 50q is a tapered tubular body made of a metal such as brass or a plastic and having a taper ratio continuously changing. The tapered tube 50q is connected to the tube body 20a with the side of the hollow portion having the larger area facing the opening 22a1. By being configured as described above, the sound resonated inside the tubular body 20a is attenuated and transmitted to the outside.

<Modification 11>
In the embodiment described above, the sub pipe portion is connected to the side surface of the main pipe portion, and the blowing portion is connected to the hollow connecting portion on the opposite side of the opening in the main pipe portion, but the sub pipe portion and the blowing portion are connected. The positions to be performed may be reversed. In this case, the main pipe part and the sub pipe part have the same positional relationship as that of the pipe body 220 shown in FIG.

  FIG. 22 is a diagram illustrating an example of a wind instrument to which the modification 11 is applied. In FIG. 22, the configuration having the same characteristics as the wind instrument 10a is shown by replacing the symbol a of the corresponding configuration with r, and the description of the features is omitted. FIG. 22 is a cross-sectional view of a wind instrument 10r according to the eleventh modification. The wind instrument 10r includes a tubular body 20r, a mouthpiece 30r corresponding to the mouthpiece 30a, and a cork 40r. The pipe body 20r includes a main pipe part 22r corresponding to the main pipe part 22a, a sub pipe part 23r corresponding to the sub pipe part 23a, and a straight tubular blowing part 24r.

  The sub pipe portion 23r is connected to the main pipe portion 22r at a hollow connection portion 22r2 opposite to the opening 22r1 of the main pipe portion 22r. The blowing part 24r is connected to the main pipe part 22r on the side surface of the main pipe part 22r on the connection part 22r3 side. In this case, in the branch pipe 21r, the main pipe part 22r and the sub pipe part 23r branch from the connection part 22r2 in opposite directions. The position where the blowing part 24r is connected approximates the position indicated by the arrow D2 in FIG. By being configured as described above, the wind instrument 10r approximates a wind instrument having a tapered tube corresponding to the cross-sectional area of the main pipe portion 22r, the cross-sectional area of the sub-pipe portion 23r, and the length of the sub-pipe portion 23r.

<Modification 12>
In the above-described second to fourth embodiments and the respective modifications, the mouthpiece is detachable from the blowing part, but may be fixed to the blowing part. For example, the mouthpiece may be fixed to an attaching / detaching portion of the blowing portion with an adhesive or the like, or may be formed integrally with the blowing portion.

<Modification 13>
In the embodiment described above, a straight tube having a circular cross section is used. However, a straight tube having an elliptical or polygonal cross section may be used. In this case, a straight tube whose cross-sectional shape and cross-sectional area do not change depending on the position to be cut may be used.

<Modification 14>
In the embodiment described above, a tapered tube having a circular cross section is used. However, a tapered tube having an elliptical or polygonal cross section may be used. In this case, it is only necessary to use tapered tubes in which the shapes of the hollow portions in the opening portions at both ends are similar and the areas of the hollow portions are different.

<Modification 15>
In the above-described embodiment, the main pipe part has a longer length than the sub pipe part. However, the present invention is not limited to this, and the main pipe part and the sub pipe part may have the same length. The pipe part may be longer than the main pipe part.

<Modification 16>
In the embodiment described above, the main pipe portion and the sub pipe portion constituting the branch pipe are straight pipes. However, the present invention is not limited to this, and either or both may be tapered pipes. In this case, in the wind instrument, the standing wave generated inside the branch pipe changes due to the influence of the shape of the taper pipe, and the timbre and pitch change as compared with the case where all are straight pipes.

<Modification 17>
In the second embodiment described above, the length of the resonating air column inside the blowing portion 24b did not change, but the length of the resonating air column inside the blowing portion 24b by providing the above-described sound hole in the blowing portion. May be changed. If a sound hole is provided in the blowing section, the air column inside the branch pipe will not resonate if this sound hole is opened, so the tone and pitch that are pronounced are significantly greater than when the sound hole is closed. Change. In this modification, the sound hole provided in the blowing portion corresponds to the “pitch adjustment portion” in the present invention.

  FIG. 23 is a diagram for explaining the tubular body 120s of the wind instrument 100s before the modification 17 is applied. The wind instrument 100s includes a tube body 120s and a mouthpiece 130s. The tube body 120s includes a tapered tube 124s and a bell 150s. The tapered tube 124s is a tapered tube having a cross-sectional area of S2s at the upper bottom surface and a cross-sectional area of S1s at the lower bottom surface. A mouthpiece 130s is attached to the tapered tube 124s from the upper bottom surface side. The tapered tube 124s has a sound hole 125s on the side surface. The bell 150s has an opening 150s1 that opens at one end, and a hollow connection 150s2 on the other side. The distance between the opening 150s1 and the connection 150s2 is Ls2. The bell 150s is connected to the tapered tube 124s on the connecting portion 150s2 side. Assume that the bell 150s approximates a tapered tube having a cross-sectional area of S1s, a height of Ls1, and a distance from the top surface to the apex of Rs1.

  FIG. 24 is a diagram illustrating an example of a wind instrument to which the modified example 17 is applied. In FIG. 24, the configuration having the same characteristics as the wind instrument 100s is shown except for the hundreds of reference numerals of the corresponding configuration, and the description of the characteristics is omitted. The pipe body 20t includes a main pipe part 22t, a sub pipe part 23t, and a blowing part 24s. The blowing portion 24s has the same configuration as the tapered tube 124s provided in the wind instrument 100s. The main pipe portion 22t and the sub pipe portion 23t constitute a branch pipe 21t that branches. The main pipe portion 22t and the sub pipe portion 23t are straight pipes. The main pipe portion 22t has an opening portion 22t1 that opens at one end portion, and has a hollow connection portion 22t2 on the other side. Here, the main pipe part 22t, the sub pipe part 23t, and the blowing part 24s are connected in the same positional relationship as the main pipe part 22a, the sub pipe part 23a, and the blowing part 24a in the pipe body 20a described above.

  The distance from the opening 22t1 to the center line Dt of the sub pipe portion 23t is Ls1. Here, when the length of the sub pipe portion 23t is H × Rs1 and the cross-sectional area is H × S1s, the branch pipe 21t has a distance from the top surface to the apex of Rs1, and the cross-sectional area of the top surface is S1s. It approximates to a tapered tube whose distance between the upper bottom surface and the lower bottom surface is Ls1. H is a positive constant represented by the above-described formula (6). That is, the branch pipe 21t approximates the bell 150s. For this reason, the pitches and tone colors produced by the wind instrument 10t approximate the pitches and tone colors produced by the wind instrument 100s.

<Modification 18>
In the second embodiment described above, the length of the resonating air column inside the blowing part 24b did not change, but the length of the resonating air column inside the blowing part 24b by providing the above-mentioned detour pipe in the blowing part. May be changed. When a detour pipe is provided in the blowing section, the distance from the mouthpiece to the main pipe and the sub pipe changes to change the feeling of blowing felt by the performer and to change the pitch. In this modified example, the detour pipe provided in the blowing portion corresponds to the “pitch adjusting portion” in the present invention.

FIG. 25 is a view for explaining the tubular body 120u of the wind instrument 100u before the modification 18 is applied. The wind instrument 100u includes a tubular body 120u, a mouthpiece 130u, and a mouthpiece mounting part 132u. The tube body 120u is composed of a tapered tube 124u1, a straight tube 124u2, and a bell 150u, and a mouthpiece attachment part 132u is bonded thereto. The taper pipe 124u1 and the straight pipe 124u2 constitute a blowing part 124u. The mouthpiece 130u is attached to the tapered tube 124u1 from the upper bottom surface side. The straight pipe 124u2 has bypass parts 128u1, 128u2, and 128u3 (hereinafter referred to as “a bypass part 128u” if not distinguished). The bypass unit 128u includes a bypass pipe having a path (hereinafter referred to as a “detour path”) that bypasses longer than a path formed by a space inside the straight pipe 124u2 (hereinafter referred to as a “straight pipe path”). The detour unit 128u includes a detour key for the performer to perform a detour operation and a valve for switching the path in conjunction with this operation. When the detour key is operated, the detour valve (rotary valve in the figure) is moved (rotated) to switch presence / absence of the straight pipe route to the detour route.
In other words, the bypass unit 128u changes the length of the air column that resonates inside the straight tube 124u2 to obtain a desired pitch.

  The bell 150u has an opening 150u1 opening at one end, and a hollow connection 150u2 on the other side. The distance between the opening 150u1 and the connection 150u2 is Lu2. The bell 150u is connected to the straight tube 124u2 on the connection portion 150u2 side. Assume that the bell 150u approximates a tapered tube having a cross-sectional area of S1u on the upper bottom surface, a height of Lu1, and a distance from the upper bottom surface to the apex of Ru1.

  FIG. 26 is a diagram illustrating an example of a wind instrument to which the modification 18 is applied. In FIG. 26, configurations having the same characteristics as the wind instrument 100u are shown except for the hundreds of the reference numerals of the corresponding configurations, and description of the features is omitted. The pipe body 20v includes a main pipe part 22v, a sub pipe part 23v, and a blowing part 24u. The blowing unit 24u has the same configuration as the blowing unit 124u included in the wind instrument 100u. The main pipe portion 22v and the sub pipe portion 23v constitute a branch pipe 21v that branches. The main pipe portion 22v and the sub pipe portion 23v are straight pipes. The main pipe portion 22v has an opening 22v1 that opens at one end, and has a hollow connection portion 22v2 on the other side. Here, the main pipe part 22v, the sub pipe part 23v, and the blowing part 24u are connected in the same positional relationship as the main pipe part 22a, the sub pipe part 23a, and the blowing part 24a in the tubular body 20a described above.

The distance from the opening 22v1 to the center line Dv of the sub-pipe 23v is Lu1. Here, when the length of the sub pipe portion 23v is H × Ru1 and the cross-sectional area is H × S1u, the branch pipe 21v has a distance from the upper bottom surface to the apex of Ru1, and the cross-sectional area of the upper bottom surface is S1u and It is approximated to a tapered tube whose distance between the upper bottom surface and the lower bottom surface is Lu1. H is a positive constant represented by the above-described formula (6). That is, the branch pipe 21v approximates the bell 150s. For this reason, the pitches and timbres produced by the wind instrument 10v approximate the pitches and timbres produced by the wind instrument 100s. 25 and 26, a path switching mechanism using a rotary valve used in a brass instrument such as a French horn is used. However, a path switching mechanism using a piston valve used in a brass instrument such as a normal trumpet may also be used. Good.

<Modification 19>
In the second embodiment described above, the length of the resonating air column inside the blowing portion 24b did not change, but the length of the resonating air column inside the blowing portion 24b by providing the above-described slide tube in the blowing portion. May be changed. When a slide tube is provided in the blowing section, the distance from the mouthpiece to the sub-tube changes to give a change to the feeling of playing felt by the performer and to change the pitch. In this modification, the slide tube provided in the blow-in portion corresponds to the “pitch adjusting portion” in the present invention.

<Modification 20>
In the modified examples 17, 18, and 19 described above, the pitch adjusting unit is provided in the blowing unit, but the pitch adjusting unit may be provided in both the main pipe unit and the blowing unit. In this case, the pitch adjustment sections (sound holes, detour sections or slide tubes) provided in the main pipe section and the blowing section may be different in combination.

<Modification 21>
The wind instrument 10n according to the modification 9 is configured such that the mouthpiece-side opening of the main pipe 22n and the opening of the sub-pipe 23n are arranged one above the other.

FIG. 27 is a diagram for explaining a tubular body 20w of a wind instrument 10w according to Modification 21. FIG. 27A is a cross-sectional view of the wind instrument 10w. It is composed of a tubular body 20w and a mouthpiece 30w configured by disposing a tubular body of a tubular main pipe portion 22w inside a tubular tubular body of the sub-pipe portion 23w. The tubular body 20w is formed of a metal such as brass. The pipe body 20w is configured by connecting a main pipe portion 22w and a sub pipe portion 23w, which are two cylindrical pipes. The main pipe portion 22w is a cylindrical pipe having a length L and a cross-sectional area of the hollow portion Sw. The sub pipe portion 23w is a tubular tube having a length of H × R and a hollow portion having a cross-sectional area of H × Sw.
The main pipe portion 22w has openings 22w1 and 22w2 that open at the ends in the longitudinal direction. The sub-pipe portion 23w has openings 23w1 and 23w2 that open at the ends in the longitudinal direction. The opening 22w2 and the opening 23w2 are located on the same plane, and each faces the mouthpiece 30w. The mouthpiece 30w inserts the cork 40w and connects to the auxiliary pipe part 23w. The sub pipe portion 23w is connected to the main pipe portion 22w through the support column 41w.

  FIG. 27B is a cross-sectional view taken along the cutting line CC in FIG. The hollow part of the main pipe part 22w is a part surrounded by the inner wall of the pipe body of the main pipe part 22w, and the cross-sectional area is Sw as described above. The hollow part of the sub pipe part 23w is a part surrounded by the inner wall of the pipe body of the sub pipe part 23w, the outer wall of the pipe body of the main pipe part 22w, and the side wall of the support column 41w. It is Sw. In this example, as shown in FIG. 27 (b), the hollow portion of the sub-pipe portion 23w is separated into three hollow portions by the three columns 41w, and each cross-sectional area is (1/3) × H ×. It is Sw. Therefore, the hollow part of the main pipe part 22w and the hollow part of the sub pipe part 23w each form a part of a circle in cross section, and the shape of the circle of the cross sectional area S (the inner wall shape of the pipe body of the sub pipe part 23w). It is formed so as to be almost equal. By being configured as described above, the wind instrument 10w approximately approximates a wind instrument having a tapered tube with a cross-sectional area of the hollow portion of the upper bottom surface of S and a length of R from the upper bottom surface to the apex.

  FIG. 31 is a diagram for explaining acoustic characteristics of the entire wind instrument 10w according to the modification 21. In FIG. A line F in FIG. 31 is an input impedance curve when the mouthpiece 130a shown in FIG. 4 is connected to the conical tube (tube body 120a). A line G in FIG. 31 approximates the wind instrument 100a shown in FIG. 4 in a form in which the secondary pipe part (attachment 801) branches inside the mouthpiece 300 as shown in FIG. 3B, and the main pipe (straight pipe 231). ) Is an input impedance curve when all sound holes (not shown) are closed, which is equal to the cross-sectional area S2a of the upper bottom surface of the conical tube (tube body 120a) shown in FIG. Line H in FIG. 31 indicates that the sum of the cross-sectional area of the hollow portion of the main pipe portion 22w and the cross-sectional area of the hollow portion of the sub-pipe portion 23w (Sw + H × Sw) is the cone shown in FIG. This is an input impedance curve when approximating it as almost the same as the cross-sectional area S2a of the upper bottom surface of the tube (tube body 120a) and closing all the sound holes.

  When these are compared, in the modified example 21 (line H), as shown in FIG. 3 (b), the sub pipe portion is a conventional branch wind instrument that branches inside the mouthpiece, and the cross-sectional area S of the main pipe (straight pipe 231). Compared with the branch wind instrument (line G) in the case where is equal to the cross-sectional area S2a of the upper and bottom surfaces of the conical tube (tube body 120a) shown in FIG. 4, the peak value of the input impedance curve especially for the bass is shown in FIG. It can be seen that it is close to the wind instrument 100a (line F) and has good acoustic characteristics.

The sum of the cross-sectional area Sw of the hollow part of the main pipe part 22w and the cross-sectional area H × Sw of the hollow part of the sub pipe part 23w is the inlet part (conical pipe 204) of the wind instrument 200 before approximation shown in FIG. Is substantially equal to the cross-sectional area S of the upper bottom surface), so that in this type of tube, in addition to the effects obtained in other forms, in comparison with other types of tubes, in comparison with conventional acoustic instruments Also, it is possible to keep the feeling of blowing well.
The wind instrument 10w is not bulky and has a high capacity because the sub-pipe part 23w is disposed along the outside of the main pipe part 22w.
In this example, the sum of the cross-sectional area Sw of the hollow part of the main pipe part and the cross-sectional area H × Sw of the hollow part of the sub pipe part is the inlet part (cone) of the blowing part of the wind instrument 200 before approximation shown in FIG. In order to adjust the feeling of wind, the cross-sectional area Sw of the hollow part of the main pipe part 22w and the cross-sectional area Hx of the hollow part of the sub-pipe part 23w are set. You may set so that the sum of Sw may become smaller than the cross-sectional area S of the inlet part (upper bottom face of the conical tube 204) of the blowing part of the musical instrument before the approximation shown to Fig.3 (a).

<Modification 22>
In the wind instrument 100a according to the first embodiment shown in FIG. 6, the cross-sectional area of the main pipe part 22a and the cross-sectional area of the terminal part of the blowing part 24a are equal to Sa. Therefore, since the sum of the cross-sectional area Sa of the main pipe portion 22a and the cross-sectional area H × Sa of the sub pipe portion 23a is larger than the cross-sectional area Sa of the terminal end portion of the blowing portion 24a, the resistance during blowing is shown in FIG. ) Is smaller than the wind instrument 100a shown in FIG. If the resistance at the time of blowing is small, there may be a negative effect such as a long tone where the sound is sustained and blown out. The modified example 22 is an example for improving this.

FIG. 28 is a diagram for explaining a tubular body 20x of a wind instrument 10x according to Modification 22. FIG. 28A is a cross-sectional view of the wind instrument 10x. The wind instrument 10x includes a tubular body 20x, a blowing section 24x, and a mouthpiece 30x configured by disposing a tubular body of the tubular main pipe section 22x inside a tubular tubular body of the sub-pipe section 23x. . The tube body 20x is formed of a metal such as brass. The tubular body 20x is configured by connecting two cylindrical pipes constituted by a main pipe part 22x and a sub pipe part 23x and a blowing part 24x. The main tube portion 22x is a cylindrical tube having a length La and a cross-sectional area Sx of the hollow portion. The tube body 23x of the sub pipe portion is a tubular tube having a length of H × Ra and a hollow portion having a cross-sectional area of H × Sx.
The main pipe portion 22x has openings 22x1 and 22x2 that open at the ends in the longitudinal direction. The sub-pipe part 23x has openings 23x1 and 23x2 that open at the ends in the longitudinal direction. Opening 22
x2 and the opening 23x2 are located on the same plane, and each faces the mouthpiece 30x. The mouthpiece 30x inserts the cork 40x and connects to the blowing part 24x. The sub pipe portion 23x is connected to the main pipe portion 22x via the support column 41x.

  FIG. 28B is a cross-sectional view taken along the cutting line DD in FIG. The hollow part of the main pipe part 22x is a part surrounded by the inner wall of the pipe body of the main pipe part 22x, and the cross-sectional area is Sx as described above. The hollow part of the sub pipe part 23x is a part surrounded by the inner wall of the pipe body of the sub pipe part 23x, the outer wall of the pipe body of the main pipe part 22x, and the side wall of the support column 41x. Sx. In this example, as shown in FIG. 28 (b), the hollow portion of the sub-pipe portion 23x is separated into three hollow portions by the three columns 41x, and each cross-sectional area is (1/3) × H ×. Sx. Therefore, the hollow part of the main pipe part 22x and the hollow part of the sub pipe part 23x each form a part of a circle, and the shape of the circle having a cross-sectional area Sa (the shape of the inner wall of the pipe body of the sub pipe part 23x). It is formed so as to be almost equal. By configuring as described above, the wind instrument 10x approximately approximates a wind instrument having a tapered tube with a cross-sectional area of the hollow portion of the upper bottom surface Sa and a length from the upper bottom surface to the apex Ra.

  FIG. 32 is a diagram for explaining acoustic characteristics of the entire wind instrument 10x according to the modification 22. A line I in FIG. 32 is an input impedance curve when the mouthpiece 130a shown in FIG. 4 is connected to the conical tube (tube body 120a). The line J in FIG. 32 approximates the part after the blowing part 24a as shown in FIG. 6B as the branch pipe 21a, and the sectional area of the terminal part of the blowing part (tapered pipe 124a) shown in FIG. 4 and the main pipe part 22a. And the sum of the cross-sectional area of the main pipe part 22a and the cross-sectional area of the sub pipe part 23a is larger than the cross-sectional area Sa at the terminal part of the blowing part (taper pipe 124a). It is an impedance curve when all the holes are closed. 32, as shown in the modified example 22, the sum of the cross-sectional area Sx of the main pipe portion 22x and the cross-sectional area H × Sx of the sub pipe portion 23x is the end portion of the blowing portion (tapered tube 124a). It is an impedance curve when it is approximated as almost the same as the cross-sectional area (corresponding to the cross-sectional area Sa shown in FIG. 4) and all the sound holes are closed.

  Comparing these, in the modified example 22 (line K), as shown in FIG. 6, the wind instrument 10a (line) in the first embodiment in which the cross-sectional area of the end portion of the blowing portion 24a and the cross-sectional area of the main pipe portion 22a are equal to Sa. Compared to J), it can be seen that the peak value of the impedance curve of the bass is particularly close to the wind instrument 100a (line I) shown in FIG. 4 before approximation and has good acoustic characteristics.

The sum of the cross-sectional area Sx of the hollow part of the main pipe part 22x and the cross-sectional area HxSx of the hollow part of the sub pipe part 23x is a break of the terminal part of the blowing part (tapered pipe 124a) of the wind instrument 100a before approximation shown in FIG. Since this area is almost equal to the area Sa, in addition to the effects obtained in other forms, the tube feeling of this form is also better than that of other acoustic instruments. Can be kept in.
The wind instrument 10x is not bulky and has a high capacity because the sub-pipe part 23x is disposed along the outside of the main pipe part 22x.
In addition to being arranged along the outer side of the main pipe part 22x, the sub pipe part 23x may be arranged so as to be installed vertically from the pipe wall at the end of the blowing part 24x toward the outside of the pipe.
In this example, the sum of the cross-sectional area Sx of the hollow portion of the main pipe portion 22x and the cross-sectional area H × Sx of the hollow portion of the sub pipe portion 23x is the sum of the blowing portion (tapered tube 124a) of the wind instrument 100a before approximation shown in FIG. Although set so as to be substantially equal to the cross-sectional area Sa of the end portion, in order to adjust the feeling of wind, the sum of the cross-sectional area Sx of the hollow portion of the main pipe portion 22x and the cross-sectional area H × Sx of the hollow portion of the sub-tube portion 23x is 4 may be set to be smaller than the cross-sectional area Sa of the end portion of the blowing portion (tapered tube 124a) of the wind instrument 100a before approximation shown in FIG. That is, when the sum of the cross-sectional area Sx of the inlet portion of the main pipe portion 22x and the cross-sectional area H × Sx of the inlet portion of the sub-pipe portion 23x is equal to or smaller than the cross-sectional area Sa of the terminal portion of the blowing portion 24x, The resistance can be increased.

10a, 10b, 10c, 10d, 10e, 10f, 10g, 10h, 10i, 10j, 10k, 10m, 10n, 10p, 10q, 10r, 10t, 10v, 10w, 10x ... wind instruments, 20a, 20b, 20c, 20d, 20e, 20f, 20g, 20h, 20i, 20j, 20k, 20m, 20n, 20r, 20t, 20v, 20w, 20x ... Tube, 21a, 21b, 21c, 21d, 21f, 21g, 21h, 21i, 21j, 21k , 21m, 21n, 21r, 21t, 21v, 21w, 21x ... branch pipe, 22a, 22b, 22c, 22f, 22h, 22j, 22k, 22m, 22n, 22r, 22t, 22v, 22w, 22x ... main pipe section, 22k3 , 23i1 ... fixed part, 22k4, 23i2 ... slide tube, 23a, 23b, 23d, 3f, 23g, 23h, 23i, 23j, 23m, 23n, 23r, 23t, 23v, 23w, 23x ... sub-pipe section, 24a, 24b, 24e, 24f, 24h, 24j, 24r, 124s, 24s, 124u, 24u, 24x ... Blowing part, 24a3, 24b3, 24e3, 24f3, 24h3, 24u3 ... Detachable part, 25a, 25b, 25h, 25r, 125s, 25s ... Sound hole, 26c, 26d, 26g, 26g2, 26h, 26i, 26j, 26k ... Octave pipe, 27d ... Open / close hole, 28j, 128u, 28u ... Detour pipe, 130a, 30a, 130b, 30b, 30e, 130f, 30f, 30h, 30n, 30r, 130s, 30s, 130u, 30u, 30w, 30x ... Mouthpiece, 31a ... lead, 132f, 32f, 132u, 32 ... mouthpiece fitting, 40a, 40b, 40e, 40h, 40n, 40r, 140s, 40s, 40w, 40x ... cork, 41w, 41x ... posts

Claims (5)

A tubular blow-in part having an attachment / detachment part that makes the mouthpiece attachable / detachable;
A branch pipe branched into a tubular main pipe section and a tubular sub pipe section, wherein the main pipe section and the sub pipe section are branched to each other, and the blowing section is connected to the branch pipe;
The main pipe part or the blowing part has a pitch adjustment part for obtaining a desired pitch in a state where a terminal part of the sub pipe part or a part of the sub pipe part is opened,
When a gas is blown from the blowing section, the gas flows through both the main pipe section and the sub pipe section. The wind instrument tube according to claim 1, wherein the pitch adjustment unit is a sound hole, a bypass tube, or a slide tube. The tubular body of the wind instrument according to claim 1 or 2, wherein the main pipe section and the sub pipe section are straight pipes. The wind instrument tube according to any one of claims 1 to 3, wherein the detachable portion is detachable from a mouthpiece using a flaky lead or lip lead. The wind instrument tube according to any one of claims 1 to 4, wherein the blowing section is a straight tube.

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