JP2903041B2 - Stringed instruments with acoustic holes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stringed instrument having a sound hole such as a guitar or a ukulele, and more particularly, to a method for reducing the amount of attenuation of a sound produced when playing a stringed instrument having a sound hole. The present invention relates to a stringed instrument having an acoustic hole capable of amplifying sound.

[0002]

2. Description of the Related Art Conventionally, stringed musical instruments having acoustic holes such as guitars and ukuleles have been widely enjoyed. In these stringed musical instruments having sound holes, good sound is still produced by the relentless pursuit of the sound of a player or an audience member who plays the stringed instrument having the sound holes. For example, the present inventor also discloses in Japanese Utility Model Publication No. 2-48875 the ceiling plate 11 of the resonance body 11.
A guitar 50 having a diaphragm 13 whose one end is directed to the acoustic hole 11d and whose one end is a free end has been proposed (see FIGS. 11 and 12).

According to the guitar 50 described in Japanese Utility Model Publication No. 2-48875, the string 14 vibrates, so that the string receiver 11e, the ceiling plate 11a, and the pair of side plates 1
1c and the back plate 11b, as well as the bracket 12 and the diaphragm 13
Since the free end of 3 can vibrate strongly, the air (or sounding body) in the resonance cylinder 11 can vibrate more strongly, and a larger sound can be generated.

[0004]

However, in the guitar 50 disclosed in Japanese Utility Model Publication No. 2-48875, for example, as shown in FIG. Are vibrated, but the vibration wave generated by the vibration of the sounding body is applied to the reinforcing block 11 h ′ provided on the top of the resonance body 11 in the opposite direction,
That is, the vibration wave is reflected in the propagation direction, and as a result, the vibration wave and the reflected wave may interfere with each other, and the effect of amplifying sound may be reduced.

The present invention has been made in view of such circumstances, and it is possible to prevent interference of sound waves that are resonated (or amplified) in a resonance cylinder, and as a result, the amount of sound attenuation is reduced. It is another object of the present invention to provide a stringed instrument having an acoustic hole capable of amplifying a sound.

[0006]

According to the present invention, there is provided a semiconductor device comprising:
A stringed musical instrument having the above described sound hole has a structure in which a string is stretched on a surface of a ceiling plate of the resonance body via a string receiver, and inside the ceiling plate of the resonance body, a longitudinal flat plate-shaped vibration is provided via a bracket. In a stringed musical instrument having an acoustic hole formed by attaching a base end of a plate, a left-right symmetrical triangular shape reflecting sound from the front to at least both sides is provided inside the resonance body in front of the free end side of the diaphragm. A reflection block is provided, and a side of the triangle has an acoustic hole which is concave in an arc shape. A stringed musical instrument having an acoustic hole according to a second aspect of the present invention is the stringed instrument having an acoustic hole according to the first aspect, wherein a columnar reflecting portion is provided at an end of the reflecting block. According to a third aspect of the present invention, there is provided a stringed musical instrument having an acoustic hole according to the first aspect of the present invention, wherein a spherical reflector is provided at a front end of the reflective block.

Here, a stringed instrument having an acoustic hole is a so-called rod-plucked stringed instrument having a resonant body (or a resonance box or body) and a neck (or a rod). And a sound hole (or a sound hole, a sound hole) for outputting the sound amplified in the resonance body to the outside. Specifically, guitar, ukulele,
Mandolin, mandola, mandello, mand base, lute, etc.

[0008] Also, when a stringed instrument having an acoustic hole is played, that is, when a string is played (hereinafter, playing a string is referred to as a bullet string), the vibration of the string is amplified in the resonance body. The amplified vibration (or sound wave) is emitted outward from the sound hole. On the other hand, the neck is used to generate a musical scale when playing a stringed instrument having the sound hole. The internal volume of the resonating body is not particularly limited, and may be appropriately selected according to a sound to be produced when a stringed instrument having an acoustic hole is played. In addition, the resonance cylinder may be provided with a resonance rod (or a reinforcement rod or a power tree) for amplifying a sound while reinforcing the resonance cylinder.

[0009] The diaphragm propagates the vibration of the resonance body (or the vibration of the string) to the front of the free end of the diaphragm when playing a stringed instrument having an acoustic hole. The vibration plate is not particularly limited as long as it can vibrate by the vibration of the resonance cylinder. For example, one end of a long flat plate is bent in one direction. In the case where the antenna is mounted on the inside of the resonance body via a bracket (or a support), a flat plate that is long in one direction (hereinafter, referred to as a long flat plate) can be used.

The vibrating plate may be provided at any position such as the base side or the top side of the resonance cylinder as long as it is inside the resonance cylinder. When attached to a stringed instrument having an acoustic hole, when playing a stringed instrument, it is possible to vibrate the air near the acoustic hole with the vibration of the string, and as a result, the tip of the diaphragm is easily vibrated,
The sound can be further amplified.

Further, when the diaphragm is attached to the inside of the resonance cylinder without covering the acoustic hole, the sound resonated (or amplified) in the resonance cylinder can be easily cut off without being interrupted by the diaphragm. Can be placed outside. For this reason, when one end of the diaphragm is mounted close to the acoustic hole, the one end may be entirely recessed in accordance with the acoustic hole. Further, the size and the thickness of the diaphragm are not particularly limited as long as they can be vibrated by the vibration of the resonance body, and may be appropriately selected.

Further, the material of the diaphragm is not particularly limited. For example, wood, bamboo, metal, synthetic resin, etc.
Various things can be used. When the material of the diaphragm is the same as the material of the ceiling plate (or the front plate) of the resonance body or the like, the elastic modulus of the diaphragm or the bracket can be the same as the elastic modulus of the ceiling plate. Therefore, the vibration of the resonance cylinder can be efficiently propagated.

Further, the reflection block means that when the vibration wave propagated by the vibration of the diaphragm is reflected by the reflection block (hereinafter, the reflected vibration wave is referred to as a reflection wave), the vibration wave and the reflection wave To prevent interference. The reflection block is not particularly limited as long as the interference can be prevented. For example, the reflection block is formed such that a distal end portion is formed in an acute angle shape in plan view and a base end portion is formed in a divergent shape. Etc. can be used (see FIGS. 2 to 8). Further, the reflection block may be solid or hollow. Further, the outer surface of the reflection block may have a curved shape (see FIGS. 2, 3, and 4).

Further, a circular shape such as a substantially spherical shape or a substantially cylindrical shape, a triangular pyramid,
By providing a pyramid-like reflecting portion such as a quadrangular pyramid, the vibration wave can be further irregularly reflected to prevent the interference. In addition, a stringed instrument having an acoustic hole to which a reinforcing block is attached in advance for the purpose of preventing the neck portion from being taken off from the resonance body or the side plate of the resonance body being taken off at the top or base of the resonance body, When attaching the reflection block, the reflection block may be actually connected to the reinforcing block (see FIGS. 10B and 10C), or the reflection block may be divided and attached (see FIG. 10B). FIG. 10D).

Further, the surface of the reflection block may be coated. This can prevent moisture, prevent adhesion of microorganisms, and the like, and can improve the surface properties, so that the reflection of vibration waves can be enhanced. In addition,
The paint is not particularly limited, and a paint or the like that is usually applied to a ceiling plate, a back plate, a side plate, or the like can be used.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention. In each of the embodiments, the same components are denoted by the same reference numerals, and description thereof will be omitted.

First, a guitar 10 which is an example of a stringed instrument having an acoustic hole according to the first embodiment of the present invention will be described. As shown in FIGS. 1 and 2, a guitar 10, which is an example of a stringed instrument according to the first embodiment of the present invention, has a resonance body 11 having an acoustic hole 11 d and a neck connected to the top of the resonance body 11. It comprises a portion 15 and a plurality of strings 14 extending from a string receiver 11e of the resonance body 11 to a winding screw 15f of the neck portion 15.

A characteristic feature of the guitar 10 is that a wooden diaphragm 13 is mounted inside the ceiling plate 11a of the resonance body 11 with one end thereof as a free end, and a free end side of the diaphragm 13 on the free end side. Reflection block (or head block) 11h attached inside the front side plate 11c
And Hereinafter, these will be described in detail.

The resonance body 11 is formed in an approximately figure eight shape, and has a wooden ceiling plate 11a such as spruce in which a circular acoustic hole 11d is formed in a substantially central portion thereof. A wooden back plate 11b of mahogany or the like formed in substantially the same shape, and a wooden pair of mahogany or the like for connecting the ceiling plate 11a and the back plate 11b in a substantially parallel state formed in a substantially wave shape in plan view. Side plate 11c.

Edge members (or reinforcing members: not shown) are provided at upper and lower ends (in other words, both ends in the longitudinal direction) of the inside of the pair of side plates 11c, respectively, and the ceiling plate 11a and the back plate 11b are provided. A plurality of resonance rods 11j are attached to the inside of the body, and a wooden reinforcing block (or a tail block) 11i 'is provided at the base of the resonance body 11.

The neck portion 15 is attached to a wooden neck body 15a connected to the top of the resonance body 11, and an outer surface of the neck body 15a and an outer surface of a ceiling plate 11a of the resonance body 11. It has a wooden fingerboard (or fingerboard) 15d such as rosewood, and a head 15c attached to one end of the neck body 15a.

A heel portion 15b is provided at one end of the neck body 15a to increase the bonding strength between the neck body 15a and the resonance body 11, and an upper chord strut is provided at a boundary between the neck body 15a and the head 15c. 15g is mounted on the outer surface of the fingerboard 15d, and a fret 15e for adjusting the interval between chromatic scales is mounted on the outer surface of the fingerboard 15d.

A plurality of strings 14 are connected to the resonance cylinder 11
And a plurality of winding screws 15f attached to the head 15c of the neck portion 15 from a string receiver (or a bridge or bridge) 11e attached to the outer surface of the ceiling plate 11a. The strings 14 are formed of different thicknesses, materials, and the like, and generate sounds of a predetermined musical scale. The string 14 is stretched so as not to touch the fingerboard 15d or the fret 15e when the string 14 is not struck.

The diaphragm 13 is made of wood, and
It is formed in the shape of a long flat plate in plan view, and is formed such that one end (or free end) thereof is completely concave. The vibration plate 13 is substantially parallel to the ceiling plate 11a and one end of the bracket 12 attached to the inside of the ceiling plate 11a of the resonance body 11 and on the back side of the string receiver 11e. It is attached to the base side of the resonance cylinder 11 in a state facing the top side of the resonance cylinder 11.

One end of the diaphragm 13 is a free end and is not covered by the acoustic hole 11d.
The bracket 12 is made of the same wood as the diaphragm 13 and is formed in a substantially columnar or prismatic shape. The reflection block 11h has a substantially triangular shape that is bilaterally symmetric in plan view, and has a concave side in an arc shape, that is, a tip end portion is acute-angled in plan view, and a base end portion. Are formed in a flared column shape.

Next, an example of how to use the guitar 10, which is an example of a stringed musical instrument according to the first embodiment of the present invention, will be described. First, when the left hand presses the predetermined position of the string 14 above the fingerboard 15d with the left hand and adjusts the scale while playing the string 14 above the sound hole 11d with the right hand, the string 1
Since the string receiver 11e, the ceiling plate 11a, the pair of side plates 11c, and the back plate 11b can be vibrated by the vibration of 4, the bracket 12 and the vibration plate 13 can be further vibrated. The sounding body in the body 11 can be vibrated strongly to sound.

As shown in FIG. 2, for example, when a vibration wave generated by vibrating the vibration plate 13 is propagated forward, that is, toward the top side of the resonance cylinder 11, Since the reflection block 11h is mounted inside the side plate 11c on the top side, the vibration wave can be reflected in a direction different from the propagation direction. As a result, it is possible to prevent the vibration wave and the reflected wave from interfering with each other as in the related art, whereby the amplitude of the vibration wave and the reflected wave is reduced, and the vibration wave and the reflected wave are rapidly generated. Attenuation can be prevented, and the vibration wave and the reflected wave can be made to resonate more in the resonance body 11.

As described above, the guitar 1 which is an example of the stringed instrument having the acoustic hole 11d according to the first embodiment of the present invention.
According to No. 0, the vibrating plate 13 is provided inside the ceiling plate 11a of the resonance body 11 with one end thereof facing the acoustic hole 11d and attached with the one end being a free end.
Air near the acoustic hole 11d vibrated by the vibration of
This vibration plate 13 can be vibrated strongly by the vibration of the ceiling plate 11a and the like of the resonance body 11, and as a result, the amplitude of the vibration wave can be increased, so that a loud sound can be generated.

Further, since the bracket 12 is attached to the base of the ceiling plate 11a, the vibration of the string 14 can be transmitted to the vibration plate 13 sensitively, and the vibration plate 13 can be vibrated strongly. Can be. Further, the diaphragm 13
Is mounted so as not to cover the acoustic hole 11d, so that when the string 14 is struck, the sound amplified in the resonance body 11 is blocked by the diaphragm 13 and goes out. Disturbance can be prevented. Further, even if the diaphragm 13 vibrates, the inside of the resonance body 11, that is, the ceiling plate 11
Since the vibration plate 13 is attached to a position that does not contact the inside of the pair of side plates 11c, the back plate 11b, and the side plate 11c, the vibration plate 13 can be prevented from coming into contact with the resonance body 11 and generating abnormal noise.

Particularly, since the reflection block 11h is provided inside the front side plate 11c on the free end side of the vibration plate 13, it is possible to prevent the vibration wave and the reflection wave from interfering with each other. As a result, In addition, the amplitude of the vibration wave or the reflected wave is reduced, so that the vibration wave or the reflected wave can be prevented from rapidly attenuating. Therefore, the vibration wave or the reflected wave (or sound) can be spread to every corner in the resonance cylinder 11 and can be well resonated in the resonance cylinder 11 (in other words, the sound can be resonated well). When a stringed instrument having the hole 11d is played, the volume can be increased and the timbre can be lingering.

Next, a description will be given of a guitar 20 which is an example of a stringed instrument having an acoustic hole according to a second embodiment of the present invention. A guitar 20 which is an example of a stringed instrument having an acoustic hole according to the second embodiment of the present invention is different from the guitar 10 which is an example of a stringed instrument having an acoustic hole according to the first embodiment of the present invention. As shown in FIG. 3, a reflective block 21h is provided in which a distal end portion is formed in an acute angle and a pointed shape in plan view, and a base end portion is formed in a divergent column shape. The side of the reflection block 21h is substantially concave in an arc shape in plan view. Thereby, the guitar 10
The same effect as described above can be obtained.

Next, a description will be given of a guitar 40 which is an example of a stringed instrument having an acoustic hole according to a third embodiment of the present invention. A guitar 40, which is an example of a stringed instrument having an acoustic hole according to the third embodiment of the present invention, is a first embodiment of the present invention.
The difference from the guitars 10 and 20 which are examples of the stringed instrument having the sound hole according to the second embodiment is that, as shown in FIG. This is a point that a reflecting block 41h having a flared column shape and a slightly swelled tip portion is provided. Note that the side of the reflection block 41h is recessed in a substantially arc shape in plan view. Thereby, the same effects as those of the guitars 10 and 20 can be obtained.

Next, a description will be given of a guitar 50 which is an example of a stringed instrument having an acoustic hole according to a fourth embodiment of the present invention. A guitar 50 which is an example of a stringed instrument having an acoustic hole according to the fourth embodiment of the present invention is the same as the first to fifth embodiments of the present invention.
FIG. 5 is different from the guitars 10, 20, and 40, which are examples of stringed instruments having an acoustic hole according to the third embodiment.
As shown in (a) and (b), a point provided with a reflecting block 51h having a substantially spherical reflecting portion 51a at the tip end. Accordingly, the same effects as those of the guitars 10, 20, and 40 can be obtained, and the vibration wave can be further irregularly reflected by the reflecting portion 51a. As a result, the interference can be surely prevented.

Next, a description will be given of a guitar 60 as an example of a stringed instrument having an acoustic hole according to a fifth embodiment of the present invention. A guitar 60 which is an example of a stringed instrument having an acoustic hole according to the fifth embodiment of the present invention,
FIG. 6 is different from the guitars 10, 20, 40, and 50 which are examples of the stringed instrument having the acoustic hole according to the fourth embodiment.
As shown in (a) and (b), a point provided with a reflecting block 61h having two substantially spherical reflecting portions 61a at the tip end. Thereby, the guitars 10, 20, 40, 5
The same effect as 0 can be obtained.

Next, a description will be given of a guitar 70 as an example of a stringed instrument having an acoustic hole according to a sixth embodiment of the present invention. A guitar 70, which is an example of a stringed instrument having an acoustic hole according to the sixth embodiment of the present invention, is a first embodiment of the present invention.
FIG. 7 is different from the guitars 10, 20, 40, and 50, which are examples of a stringed instrument having an acoustic hole according to the fourth embodiment.
As shown in (a) and (b), a point provided with a reflecting block 71h in which a substantially cylindrical reflecting portion 71a is vertically attached at the tip end. Thereby, the guitars 10, 20, 40,
The same effect as 50 can be obtained.

Next, a description will be given of a guitar 80 which is an example of a stringed instrument having an acoustic hole according to a seventh embodiment of the present invention. A guitar 80 which is an example of a stringed instrument having an acoustic hole according to the seventh embodiment of the present invention,
The difference from the guitars 10, 20, 40, and 70, which are examples of the stringed instruments having the acoustic holes according to the third and sixth embodiments, is that, as shown in FIGS. The point is that a reflecting block 81h in which a short, substantially columnar reflecting portion 81a is attached vertically is provided. Thereby, the guitar 1
The same effects as those of 0, 20, 40, and 70 can be obtained.

Next, a description will be given of a guitar 90 which is an example of a stringed instrument having an acoustic hole according to an eighth embodiment of the present invention. A guitar 90 which is an example of a stringed instrument having an acoustic hole according to the eighth embodiment of the present invention is different from the guitar 10 which is an example of a stringed instrument having an acoustic hole according to the first embodiment of the present invention. As shown in FIGS. 9A and 9B, the point that the diaphragm 13 is provided on the top side of the resonance cylinder 11
The point is that a reflection block (or a tail block) 11i is provided at the base of the resonance cylinder 11. Thereby, the same effect as that of the guitar 10 can be obtained. Note that FIG.
In (a) and (b), reference numeral 11h 'denotes a reinforcing block (or a head block).

The embodiment of the present invention has been described above.
The present invention is not limited to these embodiments, and all changes in conditions without departing from the gist are within the scope of the present invention.

For example, like the guitars 50 and 60,
At least one or more substantially spherical reflecting portions may be provided at the tip of the guitar 40. Similarly, the guitar 7
Similar to the reference numerals 0 and 80, a substantially cylindrical reflecting portion may be provided at the tip of the guitar 40.

As shown in FIG. 10 (a), a pair of recesses 91a for connecting the pair of side plates 11c is provided on the surface of the reflection block 91h facing the neck portion 15. The adhesive strength of the pair of side plates 11c can be increased, and as a result, separation of the pair of side plates 11c from the reflection block 91h can be reliably prevented.

As shown in FIG. 10B, the reflection block 100h may be mounted via a reinforcing block 11h '(11i') provided inside the resonance cylinder 11. Accordingly, for example, the work of removing the reinforcing block 11h '(11i') provided in advance can be omitted, the installation can be easily performed, and the workability can be improved. Since the reflection block 100h is actually connected to the reinforcement block 11h '(11i'), a recess 100a is formed on the surface of the reflection block 100h facing the reinforcement block 11h '(11i').

The reinforcing block 11h "(11i")
As shown in FIG. 10 (c), when a pair of recesses 101a for connecting a pair of side plates 11c is provided on a surface facing the neck portion 15, a reinforcing block 11h ″ ( 11i ″) and the pair of side plates 11c can be increased in adhesive strength to reliably prevent the pair of side plates 11c from separating from the reinforcing block 11h ″ (11i ″).

Further, as shown in FIG. 10D, the reflection block 110h may be formed so as to be able to be divided into at least two or more. Further, the reflection blocks 11h, 11i, 2
1h, 41h, 51h, 61h, 71h, 81h, 91
The surfaces of h, 100h, and 110h may be coated with, for example, varnish or lacquer. Thereby, the surface property can be enhanced and the reflectivity of the vibration wave can be enhanced.

[0044]

As is apparent from the above description, the stringed instrument having the acoustic hole according to any one of the first to third aspects has a diaphragm mounted inside the ceiling plate of the resonance body with one end thereof being a free end. Therefore, when a stringed musical instrument having an acoustic hole is played, the vibrating plate, particularly the free end, Can be vibrated strongly, so that the sounding body in the resonance body can be vibrated more strongly, and a louder sound can be produced. A vibration block (or sound) propagated by the vibration of the diaphragm is provided by including a reflection block that reflects sound from the front to both sides inside the front side of the free end side of the diaphragm. Since it can be reflected in a direction different from the propagation direction of the vibration wave,
The vibration wave and the reflected wave can be prevented from interfering with each other, and as a result, the amplitude of the vibration wave and the reflected wave can be prevented from being reduced. Can be made to resonate more and a loud sound can be produced. Further, when the diaphragm is attached to the base side from the acoustic hole of the ceiling plate with one end of the diaphragm facing the top side, usually, in a stringed instrument having an acoustic hole, one end of the string is attached to the base side of the ceiling plate. Therefore, the vibration of the strings can be transmitted to the diaphragm sensitively, and the fine vibrations of the strings can also be transmitted to the diaphragm sensitively to produce a loud sound. Further, since the vibration wave and the reflected wave can be well resonated in the resonance body, a lingering sound can be produced. Therefore, when playing the stringed musical instrument having the sound hole according to the present invention, it is possible to enjoy music that is comfortable for the player, the audience, etc., and to create a rich living space. And, since the reflection block is a symmetrical triangle whose side is concave in an arc shape, similarly to the above, the vibration wave propagated by the vibration of the diaphragm is moved in a direction different from the propagation direction of the vibration wave. Can be reflected. In particular, in the stringed musical instrument having the acoustic hole according to claims 2 and 3, the columnar or spherical reflecting portion is provided at the tip of the reflecting block, so that the reflecting block can diffusely reflect the vibration wave. As a result, the vibration wave can be reflected in a direction different from the propagation direction of the vibration wave, and the interference between the vibration wave and the reflected wave can be more reliably prevented.

[Brief description of the drawings]

FIG. 1A is a front view of a guitar which is an example of a stringed instrument having an acoustic hole according to a first embodiment of the present invention. (B) It is a sectional side view of the same guitar. FIG. 3C is an exploded perspective view of the resonance body of the guitar.

FIG. 2 is an explanatory diagram of main parts of a vibration wave and a reflected wave in a use state of the guitar.

FIG. 3 is a perspective view of a main part of a guitar which is an example of a stringed instrument having an acoustic hole according to a second embodiment of the present invention.

FIG. 4 is a perspective view of a main part of a guitar which is an example of a stringed instrument having an acoustic hole according to a third embodiment of the present invention.

FIG. 5A is a plan view of a main part of a guitar which is an example of a stringed instrument having an acoustic hole according to a fourth embodiment of the present invention. (B) It is a principal part side view of the same guitar.

FIG. 6A is a plan view of a main part of a guitar which is an example of a stringed instrument having an acoustic hole according to a fifth embodiment of the present invention. (B) It is a principal part side view of the same guitar.

FIG. 7A is a plan view of a main part of a guitar which is an example of a stringed instrument having an acoustic hole according to a sixth embodiment of the present invention. (B) It is a principal part side view of the same guitar.

FIG. 8A is a plan view of a main part of a guitar which is an example of a stringed instrument having an acoustic hole according to a seventh embodiment of the present invention. (B) It is a principal part side view of the same guitar.

FIG. 9A is a side sectional view of a guitar which is an example of a stringed instrument having an acoustic hole according to an eighth embodiment of the present invention. FIG. 2B is an exploded perspective view of the resonance body of the guitar.

FIG. 10A is a plan view of a main part of a guitar which is an example of a stringed instrument having an acoustic hole according to an embodiment of the present invention. (B) It is a principal part top view of the other guitar. (C) It is a principal part top view of the other still another guitar. (D) It is a principal part top view of the other still another guitar.

FIG. 11A is a front view of a guitar according to a conventional embodiment. (B) It is a sectional side view of the same guitar. FIG. 3C is an exploded perspective view of the resonance body of the guitar.

FIG. 12 is an explanatory diagram of main parts of a vibration wave and a reflected wave in a use state of the guitar.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Guitar 11 Resonance body 11a Ceiling plate 11b Back plate 11c Side plate 11d Sound hole 11e String receiver 11h Reflection block 11h 'Reinforcement block 11h "Reinforcement block 11i Reflection block 11i' Reinforcement block 11i" Reinforcement block 11j Resonance bar 12 Bracket 13 Vibration plate 14 String 15 Neck 15a Neck body 15b Heel 15c Head 15d Fingerboard 15e Fret 15f Winding screw 15g Upper chord receiver (nut) 20 Guitar 21h Reflection block 40 Guitar 41h Reflection block 50 Guitar 51a Reflection 51h Reflection block 60 Guitar 61a Reflection Reflection block 70 Guitar 71a Reflection section 71h Reflection block 80 Guitar 81a Reflection section 81h Reflection block 90 Guitar 91h Reflection block 91a Hollow 100 h reflection block 100a depression 101a depression 110h reflection block

Claims (3)

(57) [Claims] 1. A base end of a vibrating plate having a longitudinal plate formed on a surface of a ceiling plate of a resonance body through a string receiver and having a long plate shape inside a ceiling plate of the resonance body via a bracket. A stringed musical instrument having an acoustic hole with a portion attached thereto, wherein a reflection block formed of a symmetrical triangle that reflects sound from the front at least to both sides is provided inside the resonance body in front of the free end side of the diaphragm. Further, a stringed instrument having an acoustic hole, characterized in that the sides of the triangle are concave in an arc shape. 2. A stringed musical instrument having an acoustic hole according to claim 1, wherein a columnar reflecting portion is provided at a tip end of said reflecting block. 3. A stringed musical instrument having an acoustic hole according to claim 1, wherein a spherical reflector is provided at a tip end of said reflector block.