JP2024009619A - musical instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a musical instrument which has a body in which a cavity is formed and can provide amplification effect of reverberation sound and adjustment effect of tone.

SOLUTION: A musical instrument includes: a body which has a sounding body, a front plate part, a back plate part facing the front plate part and a side plate part which connects the front plate part and the back plate part, forms a cavity surrounded by the front plate part, the back plate part and the side plate part, and in which at least one end of the sounding body is fixed; and a compression coil spring in which one end is brought into contact with the front plate part, the other part is brought into contact with the back plate part, and which is arranged in the cavity in a compressed state much more than natural length.

SELECTED DRAWING: Figure 3

COPYRIGHT: (C)2024,JPO&INPIT

Description

The present invention relates to a musical instrument having a hollow body.

In recent years, electric instruments such as electric guitars, which use electricity to amplify the sound, have become popular, but instruments such as acoustic guitars, which retain the original sound of the instrument without using electricity to amplify the sound, have also remained popular. There is. Acoustic instruments such as acoustic guitars have bodies that produce sound without amplifying the sound with electricity, so they can be easily played in a variety of places, and the natural tone can be enjoyed in a variety of situations. can.

On the other hand, in musical instruments, when the sound is not directly amplified by electricity in response to the vibrations of the sounding body, but rather the natural sound generated by the resonant parts of the sounding body and its accompanying body is used to perform, electronic It is difficult to freely adjust the sound quality like with musical instruments. However, even in acoustic musical instruments, proposals have been made to produce better resonance by amplifying reverberant sound.

As one such technique, a technique has been proposed in which a tilted vibrating arm to which a weight is attached is attached to a planar part of a musical instrument via a musical instrument attachment part (see Patent Document 1, etc.). However, conventional resonance aids and the like cannot be said to be sufficiently efficient in propagating vibrations to the resonance aid, and have problems in terms of reverberant sound amplification effects and timbre adjustment effects.

Patent No. 6573350 specification

TECHNICAL FIELD The present invention relates to a musical instrument having a body with a cavity formed therein, and which can provide a reverberation sound amplification effect and a timbre adjustment effect.

The musical instrument according to the present invention includes:
A pronunciation body,
It has a front plate part, a back plate part facing the front plate part, and a side plate part connecting the front plate part and the back plate part, and the front plate part, the back plate part and the a body forming a cavity surrounded by a side plate portion and to which at least one end of the sounding body is fixed;
a compression coil spring having one end in contact with the top plate and the other end in contact with the back plate and disposed in the cavity in a state compressed from its natural length.

In the musical instrument according to the present invention, by compressing and arranging the compression coil spring between the top plate part and the back plate part, the vibration of the sounding body is effectively transmitted to the compression coil spring, thereby improving the amplification effect of reverberant sound and improving the tone quality. The adjustment effect can be obtained. In addition, the compression coil spring presses the top and back plates, giving them just the right amount of tension, which amplifies and improves the resonance of the sound produced by the instrument. can be done. In addition, compression coil springs tend to strengthen low-pitched (long-period) sounds, and can effectively improve the resonance of low-pitched sounds.

Furthermore, for example, the musical instrument according to the present invention has one end connected to the top plate part, the other end connected to the back plate part, and placed in the cavity in a state stretched from its natural length. It may further include a tension coil spring.

By placing the tension coil spring stretched between the top plate and the back plate, the vibrations of the sounding body are effectively transmitted to the tension coil spring, and the effect of amplifying reverberant sound and adjusting the tone can be obtained. . In addition, if compression coil springs are used alone, there is a problem in that the force pushing the top and back plates toward the outside of the cavity becomes too strong, but by using tension coil springs together, the top and back plates can be pushed together. Since the forces of the springs acting on the body cancel each other out, multiple springs can be placed without reinforcing the body.

Further, for example, the sounding body may have a plurality of strings having different linear densities,
A bridge that contacts the plurality of strings and forms an end of vibration of the plurality of strings may be provided on the surface side of the top plate part,
The at least three tension coil springs are provided, and one end of each of the at least three tension coil springs forms a reference circle having a diameter of the bridge when viewed from a direction perpendicular to the top plate portion. Inside, it may be connected to the back side of the front plate part.

In the case of a stringed instrument such as a guitar, where the sounding body of the musical instrument has strings and the bridge is provided on the front side of the sounding body, by placing one end of the tension coil spring near the bridge, the spring and body can be , can vibrate more effectively. Note that the number of compression coil springs and tension coil springs may be increased or decreased depending on the size of the musical instrument. For example, in a small musical instrument such as a ukulele, the number of compression coil springs and tension coil springs may be increased or decreased. It can be about 2 pieces.

Further, for example, the at least three tension coil springs are arranged so that the distance between them increases from one end connected to the top plate part to the other end connected to the back plate part. They may also be arranged radially.

By arranging the tension coil springs in a radial manner in this way, the springs as well as the front plate and back plate to which the springs are connected are effectively vibrated, and the effect of amplifying reverberant sound and adjusting the tone can be obtained.

Further, for example, the sounding body has a plurality of strings with different linear densities,
A bridge that contacts the plurality of strings and forms an end of vibration of the plurality of strings may be provided on the surface side of the top plate part,
The compression coil spring may be arranged closer to a high-density string having the highest linear density among the plurality of strings than to a low-density string having the lowest linear density among the plurality of strings.

Compression coil springs tend to strengthen sounds on the bass (long period) side, so placing them near high-density strings with high linear density can effectively improve the resonance of sounds on the bass side. can.

Further, for example, the sounding body may have a plurality of strings having different linear densities,
A bridge that contacts the plurality of strings and forms an end of vibration of the plurality of strings may be provided on the surface side of the top plate part,
It has at least two compression coil springs, and one of the at least two compression coil springs has the highest linear density among the plurality of strings when viewed from a direction perpendicular to the top plate part. The at least two compressed compressors are disposed at a position farther from the center line of the body than the high-density string and its extension line, and closer to the high-density string or its extension line than the center line, and The other one of the coil springs is farther from the center line of the body than the low-density string having the lowest linear density among the plurality of strings and its extension line, when viewed from a direction perpendicular to the top plate portion. The low-density chord may be located closer to the low-density chord or its extension than the center line.

By arranging two compression coil springs on both sides of the center line, the force acting from the springs on the body can be homogenized and the problem of excessive force acting locally on the body can be prevented. Furthermore, by arranging compression coil springs on both sides of the bridge, the springs and the front and back plates to which they are connected can be effectively vibrated, resulting in the effect of amplifying reverberant sound and adjusting the tone.

For example, the musical instrument further includes a sound stopper that is operable to come into contact with and separate from the compression coil spring, and that stops or suppresses vibration of the compression coil spring when in contact. Good too.

A guitar having such a sound stop part can adjust the resonance of the sound produced by the instrument by operating the sound stop part according to the melody or the balance with other instruments.

FIG. 1 is an external view of a musical instrument according to a first embodiment of the present invention. FIG. 2 is a conceptual diagram showing the arrangement of a compression coil spring and a tension coil spring arranged within the body of the musical instrument shown in FIG. FIG. 3 is a cross-sectional view of the musical instrument shown in FIG. FIG. 4 is a conceptual diagram showing a compression coil spring and a tension coil spring used in the musical instrument shown in FIG. FIG. 5 is an external view of a musical instrument according to a second embodiment of the present invention. FIG. 6 is a conceptual diagram showing the arrangement of a compression coil spring, a tension coil spring, and an additional tension coil spring arranged within the body of the musical instrument shown in FIG. FIG. 7 is a conceptual diagram showing the arrangement of additional tension coil springs arranged on the inner surface side of the top plate portion of the musical instrument shown in FIG. 5. FIG. FIG. 8 is a cross-sectional view of the musical instrument shown in FIG. FIG. 9 is a conceptual diagram showing the arrangement of a compression coil spring and a tension coil spring arranged in the body of a musical instrument according to a second embodiment of the present invention. FIG. 10 is a conceptual diagram illustrating a tension coil spring and a sound stop portion arranged within the body of a musical instrument according to a modification.

First Embodiment FIG. 1 is an external view showing a guitar 10 as a musical instrument according to a first embodiment of the present invention. In the embodiment, explanation will be given using the guitar 10 as an example of a musical instrument, but the musical instrument to which the invention is applied may be a stringed instrument other than the guitar 10, such as a ukulele, a violin, a lute, or a mandolin, or a stringed instrument such as a percussion instrument or a wind instrument. Other musical instruments may also be used.

The guitar 10 includes a head 51, a plurality of strings 20 as a sounding body, a neck 53, a body 30, and the like. The guitar 10 also includes compression coil springs (first compression coil spring 61 and second compression coil spring 66) and tension coil springs (first tension coil spring 71, A second tension coil spring 72, a third tension coil spring 73, a fourth tension coil spring 74, and a fifth tension coil spring 75).

Guitar 10 has much in common with typical guitars, except for the presence of compression and tension coil springs located within cavity 37 of body 30. For example, the guitar 10 has a plurality of strings 20 having different linear densities as sounding bodies. The plurality of strings 20 are composed of six strings, which are a first string 21, a second string 22, a third string 23, a fourth string 24, a fifth string 25, and a sixth string 26 in descending order of linear density. Note that in this specification, the linear density means the mass per unit length of each of the strings 21 to 26.

The guitar 10 also includes a top plate 32 in which the sound hole 32d is formed, a back plate 34 opposite to the top plate 32, and a connection between the outer periphery of the top plate 32 and the outer periphery of the back plate 34. It has a side plate part 36. The body 30 forms a cavity 37 surrounded by a front plate part 32, a back plate part 34, and a side plate part 36. One ends of the plurality of strings 20, which are sounding bodies, are fixed to the top plate portion 32 of the body 30 via string pins 54 and the like.

As shown in FIG. 1, in the guitar 10, a neck 53 extends from the body 30, and a head 51 is connected to the tip of the neck 53. The other ends of the plurality of strings 20 are fixed to the head 51 via pegs 52. Thereby, by operating the pegs 52, the plurality of strings 20, which are sounding bodies, are passed from the head 51, over the neck 53 and over the sound hole 32d formed on the top plate part 32, to the surface of the body 30. The string pin 54 of the plate part 32 is stretched with a predetermined tension.

Further, a bridge 40 is provided on the front surface side 32a of the top plate portion 32 of the body 30, adjacent to the neck 53 side with respect to the string pin 54. The bridge 40 contacts the plurality of strings 20, which are sounding bodies, and forms vibration ends of the plurality of strings 20 at the contact positions between the plurality of strings 20 and the bridge 40.

The material of the body 30 is not particularly limited, and examples include wood such as spruce, cedar, and rosewood, but materials other than wood such as resin may also be used. For example, the resonance may be improved or adjusted by partially or entirely constructing the front plate part 32, the back plate part 34, the side plate part 36, etc. using metal, FRP, or the like. The pegs 52, string pins 54, bridge 40, etc. can be made of metal, resin, wood, cow bone, etc., but are not particularly limited. In addition, the first string 21 to the sixth string 26 that constitute the plurality of strings 20 are made of resin such as nylon, metal strings, wound strings made of nylon floss wrapped with copper wire, or metal wound strings. The materials of the plurality of strings 20 are also not limited to these.

As shown by dotted lines in FIG. 1, compression coil springs 61, 66 and tension coil springs 71, 72, 73, 74, 75 are arranged in the cavity 37 formed by the body 30. FIG. 2 omits illustration of the front plate part 32 of the body 30 shown in FIG. FIG. 3 is a conceptual diagram showing the arrangement relationship.

As shown in FIG. 2, two compression coil springs and five tension coil springs are arranged in the cavity 37 formed by the body 30. The two compression coil springs include a first compression coil spring 61 and a second compression coil spring 66. The five tension coil springs include a first tension coil spring 71 , a second tension coil spring 72 , a third tension coil spring 73 , a fourth tension coil spring 74 , and a fifth tension coil spring 75 .

FIG. 3 is a sectional view showing the internal state of the body 30 of the guitar 10 shown in FIG. As shown in FIGS. 2 and 3, the second compression coil spring 66 has one end 66a in contact with the front plate part 32, the other end 66b in contact with the back plate part 34, and is compressed from its natural length. It is placed in the cavity 37 in a closed state. Also, regarding the first compression coil spring 61 shown in FIG. They are arranged in the cavity 37 in a state in which they are in contact and are compressed from their natural length.

As shown in FIGS. 2 and 3, the first compression coil spring 61 and the second compression coil spring 66 are sandwiched between the inner surface 32b of the top plate 32 and the inner surface 34b of the back plate 34. , the front plate part 32 and the back plate part 34 are held in a predetermined position within the cavity 37 by the force that compresses the first compression coil spring 61 and the second compression coil spring 66. Even if the inner surfaces 32b and 34b of the top plate part 32 and the back plate part 34 are formed with protrusions, recesses, etc. that prevent the first compression coil spring 61 and the second compression coil spring 66 from shifting from their predetermined positions. good.

As can be understood from FIGS. 1 and 2, the first compression coil spring 61 is more sensitive to the sixth string 26, which has the highest linear density among the plurality of strings 20, than the first string 21, which has the lowest linear density among the plurality of strings 20. located nearby. Here, the compression coil springs 61 and 66 tend to strengthen the low-pitched sound generated by the 4th to 6th strings rather than the high-pitched tone generated by the 1st to 3rd strings 21 to 23, so if the guitar 10 is When there is only one coil spring, it is preferable to arrange it near the sixth string 26 like the first compression coil spring 61 (see FIG. 5).

Further, as shown in FIG. 1, when the guitar 10 has at least two compression coil springs, the first compression coil spring 61 and the second compression coil spring 66 are parallel to the plurality of strings 20 in the body 30. It is also preferable that they be distributed and arranged on both sides of the center line 38 in the same direction. That is, the first compression coil spring 61, which is one of the at least two compression coil springs 61 and 66, has the highest linear density among the plurality of strings 20 when viewed from the direction perpendicular to the top plate portion 32. It is located at a position farther from the center line 38 of the body 30 than the sixth string 26, which is a high-density string, and its extension line 26a, and closer to the sixth string 26 or its extension line 26a than the center line 38.

The second compression coil spring 66, which is the other one of the at least two compression coil springs 61 and 66, has the highest linear density among the plurality of strings 20 when viewed from the direction perpendicular to the top plate portion 32. It is located at a position farther from the center line 38 of the body 30 than the first string 21, which is a low-density string, and its extension line 21a, and closer to the first string 21 or its extension line 21a than the center line 38. Ru. By arranging the two compression coil springs 61 and 66 on both sides of the center line 38, the forces acting on the body 30 from the compression coil springs 61 and 66 are homogenized, and excessive force is locally applied to the body 30. This can prevent problems that may occur. Further, the guitar 10 has compression coil springs 61 and 66 disposed on both sides of the bridge 40, and a top plate part 32 and a back plate part to which the compression coil springs 61 and 66 and both ends of the compression coil springs 61 and 66 are connected. 34 to effectively resonate and vibrate with respect to the vibrations generated by the plurality of strings 20, thereby achieving the effect of amplifying reverberant sound and adjusting the tone color.

FIG. 4 is an external view of the first compression coil spring 61. The first compression coil spring 61 can have, for example, a length of about 75 to 200 mm, an outer diameter of about 5 to 20 mm, and a wire diameter of about 0.5 to 2 mm, but the size of the first compression coil spring 61 is not particularly limited. First, it is adjusted as appropriate depending on the size and strength of the body 30. Further, the first compression coil spring 61 can be placed in the cavity 37 of the body 30 in a state where it is compressed, for example, by about 5 to 30% with respect to its natural length, but the compression ratio of the first compression coil spring 61 is Not particularly limited. The size and compression rate of the second compression coil spring 66 are also the same as those of the first compression coil spring 61.

As shown in FIGS. 2 and 3, the first tension coil spring 71 has one end 71a connected to the front plate part 32, the other end 71b connected to the back plate part 34, and is stretched beyond its natural length. It is placed in the cavity 37 in a suspended state. As shown in FIG. 3, one end 71a of the first tension coil spring 71 is attached to the top plate 32 via a hook 90 attached to a strength bar 32c formed on the inner surface 32b of the top plate 32. Connected.

Further, the other end 71b of the first tension coil spring 71 is connected to the back plate 34 via a hook 90 attached to a strength bar 34c formed on the inner surface 34b of the back plate 34. Further, with respect to the second to fifth tension coil springs 72 to 75, which are tension coil springs other than the first tension coil spring 71, one end portions 72a to 75a are the front plate portions, similarly to the first tension coil spring 71. 32, and the other end portions 72b to 75b are connected to the back plate portion 34, and is disposed within the cavity 37 in a state where it is stretched from its natural length.

As shown in FIGS. 2 and 3, the guitar 10 has at least three (five in the embodiment) tension coil springs 71 to 75, and each of the at least three tension coil springs 71 to 75 has one The ends 71a to 75a are connected to the top plate part 32 via hooks 90 installed on the back side of the bridge 40 in the top plate part 32. That is, as shown in FIG. 1, each of the tension coil springs 71 to 75 has one end 71a to 75a located inside a reference circle 42 whose diameter is the bridge 40 when viewed from a direction perpendicular to the top plate portion 32. , it is connected to the inner surface side 32b (see FIG. 3) of the top plate portion 32.

By connecting one end portions 71a to 75a of the tension coil springs 71 to 75 to the front plate portion 32 around which the bridge 40 is provided, the tension coil springs 71 to 75 and the front plate portion 32 can be connected to a plurality of strings 20. It is possible to effectively resonate and vibrate the vibrations caused by this, thereby effectively intensifying reverberant sounds. Note that the ends 71a to 75a of the tension coil springs 71 to 75 do not necessarily have to be engaged with one hook 90 all at once as shown in FIG. 3, but may be engaged with a plurality of hooks separately. You can leave it there.

Further, as shown in FIGS. 1 to 3, at least three tension coil springs 71 to 75 are connected from one end 71a to 75a connected to the top plate part 32 to the other end connected to the back plate part 34. They may be arranged radially such that the distance from each other increases toward the portions 71b to 75b. By arranging the tension coil springs 71 to 75 radially, the tension coil springs 71 to 75 and the top plate section 32 and back plate section 34 to which the tension coil springs 71 to 75 are connected are effectively resonated and vibrated, thereby reducing reverberant sound. You can obtain amplification effects and tone adjustment effects.

4(a) is an external view of the first tension coil spring 71, FIG. 4(b) is an external view of the second tension coil spring 72, and FIG. 4(c) is an external view of the fourth tension coil spring 74. FIG. As shown in FIGS. 4(a) to 4(c), the first helical tension spring 71, the second helical tension spring 72, and the fourth helical tension spring 74 have different natural lengths. In the guitar 10 shown in FIGS. 1 to 3, the tension coil springs 71 to 75 are configured by a plurality of springs having different natural lengths, so that the magnitude of the force generated when the tension coil springs 71 to 75 are stretched can be reduced. It is possible to appropriately adjust the natural frequencies of the tension coil springs 71 to 75.

The natural length of the tension coil springs 71 to 75 is not particularly limited, but may be about 50 to 300 mm in length, about 5 to 20 mm in outer diameter, and about 0.5 to 2 mm in wire diameter, but is not particularly limited. Further, the tension coil springs 71 to 75 can be placed in the cavity 37 of the body 30 in a state where they are stretched, for example, by about 5 to 40% relative to their natural length, but the stretching ratio of the tension coil springs 71 to 75 is Not particularly limited.

In the guitar 10 shown in FIGS. 1 to 3, compression coil springs 61 and 66 are compressed and arranged between the top plate part 32 and the back plate part 34, so that the vibrations of the plurality of strings 20, which are sounding bodies, are compressed. It is effectively transmitted to the coil springs 61 and 66, and the effect of amplifying reverberant sound and adjusting the tone color can be obtained. In addition, the compression coil springs 61 and 66 press the top plate 32 and the back plate 34, so that the top plate 32 and the back plate 34 can be given appropriate tension. The resonance of the generated sound can be improved. Moreover, the compression coil springs 61 and 66 tend to strengthen the sound on the bass side (long period), and can effectively improve the resonance of the sound on the bass side.

In addition, the guitar shown in FIGS. 1 to 3 also has tension coil springs 71 to 75 stretched between the top plate part 32 and the back plate part 34, so that the plurality of strings 20, which are sounding bodies, can be The vibrations are effectively transmitted to the tension coil springs 71 to 75, and the effect of amplifying reverberant sound and adjusting the tone can be obtained. Furthermore, if only the compression coil springs 61 and 66 are used, there is a risk that the force pushing the top plate part 32 and the back plate part 34 toward the outside of the cavity 37 will be too strong. By using the compression coil springs 61 and 66 together, the spring forces acting on the top plate 32 and the back plate 34 cancel each other out in the inner and outer directions, so the front plate 32 and the back plate 34 are moved outward. This prevents the problem of too strong a pushing force and allows many springs to be placed in the cavity 37.

Second Embodiment FIG. 5 is an external view showing a guitar 210 according to a second embodiment of the present invention. The guitar 210 shown in FIG. It differs from the guitar 10 shown in FIG. 1 in that it is provided. However, the guitar 210 shown in FIG. 5 is the same as the guitar 10 except for the compression coil spring 261, the tension coil springs 271 and 272, and the additional tension coil springs 281 to 287. The explanation of the guitar 210 will focus on the differences from the guitar 10, and the common points with the guitar 10 will be given the same reference numerals and the explanation will be omitted.

As shown in FIG. 5, guitar 210 has one compression coil spring 261. As shown in FIG. 6 omits illustration of the top plate portion 32 of the body 30, and shows the arrangement relationship of the compression coil spring 261, tension coil springs 271, 272, and additional tension coil springs 281, 282 connected to the back plate portion 34 of the guitar 210. FIG. Further, FIG. 8 is a cross-sectional view showing the inside of the cavity 37 of the body 30 of the guitar 210.

As shown in FIGS. 6 and 8, the compression coil spring 261, like the compression coil spring 61 shown in FIG. It is placed in the cavity 37 in a state in which it is in contact with the portion 34 and is compressed from its natural length. Further, as shown in FIG. 5, similarly to the first compression coil spring 61 shown in FIG. It is placed near the 6th string 26.

However, the arrangement of the compression coil spring 261 is different from that of the first compression coil spring 61, which is arranged near the bridge 40, in that the compression coil spring 261 is arranged near the sound hole 32d. Although the arrangement of the compression coil spring 261 is not particularly limited, by arranging it near the sound hole 32d as shown in FIG. 5, it is possible to replace or remove the compression coil spring 261 as necessary. , it is easy to attach and detach from the body 30.

As shown in FIGS. 5 and 6, the guitar 210 has two tension coil springs, and the two tension coil springs are a first tension coil spring 271 and a second tension coil spring 272. The first and second tension coil springs 271 and 272, like the tension coil springs 71 to 73 shown in FIG. is connected to the back plate portion 34 and placed in the cavity 37 in a state where it is stretched from its natural length.

7 omits illustration of the back plate part 34 of the body 30, and shows first and second tension coil springs 271, 272 and additional tension coil springs 283, 284, 285, 286 connected to the top plate part 32 of the guitar 210. , 287 is a conceptual diagram showing the arrangement relationship of . As shown in FIG. 7, one end portions 271a, 272a (see FIGS. 6 and 8) of the first and second tension coil springs 271, 272 are attached to a strength bar 32c provided on the inner surface side 32b of the top plate portion 32. It is connected to via a hook 90. Further, as shown in FIG. 6, the other end portions 271b and 272b of the first and second tension coil springs 271 and 272 are connected to the hook 90 with respect to the strength bar 34c provided on the inner surface side 34b of the back plate portion 34. connected via.

As shown in FIGS. 5 and 8, the first and second tension coil springs 271 and 272 are arranged substantially symmetrically on both sides of the center line of the body 30 with the bridge 40 in between. The arrangement of the tension coil springs 271 and 272 is not particularly limited, and may be arranged approximately symmetrically on both sides of the bridge 40 as shown in FIG. , may be arranged radially from the vicinity of the bridge 40.

As shown in FIGS. 5 and 6, the guitar 210 has additional tension coil springs 281, 282. The additional tension coil springs 281, 282 are composed of tension coil springs like the first and second tension coil springs 271, 272, but unlike the first and second tension coil springs 271, 272, both ends are Connected to the back plate section 34. The additional tension coil springs 281 and 282 are installed in the cavity 37 in a state where they are stretched moderately from their natural length, and the additional tension coil springs 281 and 282 are designed to absorb vibrations of the plurality of strings 20 mainly through the back plate portion 34. is conveyed.

As shown in FIGS. 5 and 7, guitar 210 further includes additional tension coil springs 283-287. The additional tension coil springs 283 to 287 are composed of tension coil springs like the first and second tension coil springs 271 and 272, but unlike the first and second tension coil springs 271 and 272, both ends are Connected to the top plate section 32. The additional tension coil springs 283 to 287 are installed in the cavity 37 in a state where they are stretched moderately from their natural lengths, and the additional tension coil springs 283 to 287 are provided with vibrations of the plurality of strings 20 mainly through the top plate portion 32. is conveyed.

As shown in FIGS. 7 and 8, three additional tension coil springs 283-285 are arranged radially near the bridge 40. Further, the additional tension coil springs 281, 282 and the additional tension coil springs 286, 287 are arranged substantially symmetrically on both sides of the center line of the body 30. The shapes of the additional tension coil springs 283 to 285, 286, and 287 are similar to the tension coil springs 71 to 75, 271, and 272.

In addition to the compression coil spring 261 and the tension coil springs 271 and 272, the guitar 210 may have additional tension coil springs 281 to 287. It vibrates together with the top panel 32 and has the effect of intensifying reverberation and adjusting the resonance of the sound. However, in order to improve the sound of the guitar 210, it is possible to provide a spring to connect the top plate part 32 and the back plate part 34, such as the compression coil spring 261 or the tension coil springs 271 and 272. , more preferred. Note that the guitar 210 has the same effects as the guitar 10 in terms of common features with the guitar 10.

Third Embodiment FIG. 9 shows first to fourth compression coil springs 361 to 364 and first to sixth tension coil springs 371 to 376 arranged in a guitar body 330 according to a third embodiment of the present invention. FIG. 3 is a conceptual diagram showing the arrangement. The guitar shown in FIG. 9 differs from the guitar 10 shown in FIG. 1 in the number, shape, and arrangement of compression coil springs 361 to 364 and tension coil springs 371 to 376. However, the guitar shown in FIG. 9 is the same as the guitar 10 except for these parts. The description of the guitar according to the third embodiment will focus on the differences from the guitar 10, and the same reference numerals will be given to the common points with the guitar 10, and the description will be omitted.

The first to fourth compression coil springs 361 to 364 shown in FIG. 9 have one end connected to the top plate portion 32 (see FIG. 3), similarly to the first and second compression coil springs 61 and 66 shown in FIG. The other end is in contact with the back plate part 34, and is arranged in the cavity 37 in a state where it is compressed from its natural length. As shown in FIG. 9, by increasing the number of compression coil springs 361 to 364, it is possible to more effectively improve the reverberation of sound and amplify reverberant sound. In addition, by increasing the number of compression coil springs 361 to 364, the balance against the increase in the number of tension coil springs 371 to 376 can be ensured, and the problem of the bridge 40 of the top plate part 32 lowering toward the cavity 37 (arched top (Also referred to as an "arch top") structure, such as a guitar, can prevent so-called "dropped tops" (or "dropped frames").

The first to sixth tension coil springs 371 to 376 shown in FIG. 9 have one end connected to the top plate portion 32 (see FIG. 3), similar to the first to fifth tension coil springs shown in FIG. , the other end is connected to the back plate part 34, and is placed in the cavity 37 in a state where it is stretched out from its natural length. By connecting one end of the tension coil springs 371 to 376 to the peripheral surface plate portion 32 where the bridge 40 (see FIG. 1) is provided, the tension coil springs 371 to 376 and the surface plate portion 32 are effectively connected. It can vibrate and effectively intensify reverberant sounds.

In addition, in the guitar shown in FIG. 9, six tension coil springs 371 to 376 of approximately equal length are connected from one end connected to the top plate 32 to the other end connected to the back plate 34. They are arranged radially so that the distance from each other increases. Further, the first to third tension coil springs 371 to 373 are arranged approximately symmetrically with respect to the fourth to sixth tension coil springs 374 to 376. By arranging the first to sixth tension coil springs 371 to 376 in this manner, the top plate portion 32 to which the first to sixth tension coil springs 371 to 376 and the first to sixth tension coil springs 371 to 376 are connected In addition, the back plate portion 34 can be effectively vibrated, and the effect of amplifying reverberant sound and adjusting the tone can be obtained.

Note that the guitar according to the third embodiment has the same effects as the guitar 10 regarding the common points with the guitar 10.

Modification FIG. 10 is a conceptual diagram showing the arrangement of the sound stop part 492 and tension coil springs 471a to 471b arranged inside the cavity 37 of the guitar body according to a modification. Note that in FIG. 10, illustration of the compression coil spring is omitted. The sound stopping part 492 shown in FIG. 10 has a substantially truncated conical contact part 492a and the like.

The contact portion 492a of the sound stop portion 492 moves in the vertical direction (direction connecting the front plate portion and the back plate portion) shown by the arrow 493 in FIG. It is provided so that it can be brought into contact with and separated from the As shown in FIG. 10, a felt 492aa similar to a piano damper is provided on the surface of the side surface of the contact portion 492a. The felt 492aa of the contact portion 492a is pressed against the tension coil springs 471a to 471b by an operation wire or an operation shaft (not shown) (position P1), and by contacting the tension coil springs 471a to 471b, the tension coil springs 471a to 471b are Vibration can be stopped or suppressed.

On the other hand, when the contact portion 492a is moved to a position (position P2) where it is separated from the tension coil springs 471a to 471b by the player's operation, the tension coil springs 471a to 471b prevent the reverberant sound as shown in the above embodiment. Provides an amplification effect and a tone adjustment effect. The operating shaft or operating wire that supports the contact portion 492a is connected to the side plate portion of the body, and the structure in which the contact portion 492a is supported from the side plate portion of the body prevents resonance of the body from being suppressed by these structures. This is preferable from the viewpoint of

The performer can change the reverberant sound amplification effect and timbre adjustment effect of the tension coil springs 471a to 471b by operating the sound stopping section 492 to come into contact with and separate from the tension coil springs 471a to 471b. For example, the performer can adjust the sound of the guitar by operating the sound stop section 492 according to the melody and balance with other instruments. A similar sound stopper 492 can also be provided in other tension coil springs or compression coil springs.

Although the present invention has been described above by citing a plurality of embodiments, the technical scope of the present invention is not limited only to the above-described embodiments, and includes many other embodiments and modifications. Needless to say. For example, in the embodiment, an acoustic musical instrument that generates performance sound without electrically amplifying the sound has been described as an example, but the present invention provides a pickup, amplifier, etc. It is also possible to apply the present invention to an electric musical instrument that has a body that has a body.

However, the musical instrument according to the present invention does not use electricity to amplify the sound of the vibrations of the sounding body, but when live performance is performed by making use of the natural sounds generated by the resonating parts of the sounding body and its accompanying body. It is particularly effective, and can improve the sound as if you were playing in a concert hall with good acoustics. Therefore, it is more preferable to apply the present invention to musical instruments that perform live performances without electrically amplifying sound.

10, 210, 310...guitar (musical instrument)
20... Plural strings 21... 1st string 22... 2nd string 23... 3rd string 24... 4th string 25... 5th string 26... 6th string 21a, 26a... Extension line 30... Body 32... Top plate part 32a... Surface side 32b, 34b ...Inner side 32c...Strength wood 32d...Sound hole 34...Back plate parts 32b, 34b...Inner side 32c, 34c...Strength wood 36...Side plate part 37...Cavity 38...Center line 40...Bridge 42...Reference circle 51...Head 52...Peg 53...Neck 54...String pin 61, 261...First compression coil spring 61a, 66a, 71a, 72a, 73a, 74a, 75a, 261a, 271a, 272a...One end 61b, 66b, 71b, 72b , 73b, 74b, 75b, 261b, 271b, 272b...Other end 66...Second compression coil spring 71, 271...First tension coil spring 72, 272...Second tension coil spring 73...Third tension coil spring 74 ...Fourth tension coil spring 75...Fifth tension coil spring 90...Hooks 281, 282, 283, 284, 285, 286, 287...Additional tension coil spring

Claims (7)

A pronunciation body,
It has a front plate part, a back plate part facing the front plate part, and a side plate part connecting the front plate part and the back plate part, and the front plate part, the back plate part and the a body forming a cavity surrounded by a side plate portion and to which at least one end of the sounding body is fixed;
A compression coil spring having one end in contact with the top plate, the other end in contact with the back plate, and disposed within the cavity in a state compressed from its natural length. Claim 1 further comprising a tension coil spring, one end of which is connected to the top plate, the other end of which is connected to the back plate, and is disposed within the cavity in a state where it is stretched from its natural length. Instruments listed in. The sounding body has a plurality of strings with different linear densities,
A bridge that contacts the plurality of strings and forms an end of vibration of the plurality of strings is provided on the surface side of the top plate portion,
The at least three tension coil springs are provided, and one end of each of the at least three tension coil springs forms a reference circle having a diameter of the bridge when viewed from a direction perpendicular to the top plate portion. The musical instrument according to claim 1, wherein the musical instrument is connected to the back side of the top plate portion inside. The at least three tension coil springs are arranged radially such that the distance between them increases from one end connected to the top plate part to the other end connected to the back plate part. The musical instrument according to claim 3. The sounding body has a plurality of strings with different linear densities,
A bridge that contacts the plurality of strings and forms an end of vibration of the plurality of strings is provided on the surface side of the top plate portion,
The musical instrument according to claim 1, wherein the compression coil spring is arranged closer to a high-density string having the highest linear density among the plurality of strings than to a low-density string having the lowest linear density among the plurality of strings. The sounding body has a plurality of strings with different linear densities,
A bridge that contacts the plurality of strings and forms an end of vibration of the plurality of strings is provided on the surface side of the top plate portion,
It has at least two compression coil springs, and one of the at least two compression coil springs has the highest linear density among the plurality of strings when viewed from a direction perpendicular to the top plate portion. The at least two compressed compressors are disposed at a position farther from the center line of the body than the high-density string and its extension line, and closer to the high-density string or its extension line than the center line, and The other one of the coil springs is farther from the center line of the body than the low-density string having the lowest linear density among the plurality of strings and its extension line, when viewed from a direction perpendicular to the top plate portion. The musical instrument according to claim 1, wherein the musical instrument is located closer to the low-density string or the extension thereof than the center line. The musical instrument according to claim 1, further comprising a sound stopper that is operable to come into contact with and separate from the compression coil spring, and stops or suppresses vibration of the compression coil spring when in contact.

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