WO2022097304A1

WO2022097304A1 - Acoustic apparatus

Info

Publication number: WO2022097304A1
Application number: PCT/JP2020/041759
Authority: WO
Inventors: 功児小林; 竜太香川
Original assignee: 株式会社弦奏Japan
Priority date: 2020-11-09
Filing date: 2020-11-09
Publication date: 2022-05-12
Also published as: CN114762036A; JP7329870B2; JP2023080380A

Abstract

The present invention provides an acoustic apparatus that is attached to any of a plucked string instrument, a bowed string instrument, and a struck stringed instrument. An acoustic apparatus 10 is provided with a vibration mechanism 11, a base part 12, a string retaining part 13, a through-hole 14, a string hanging part 15, a displacement mechanism 18, and fine adjustment mechanisms 21, 22. The string hanging part 15 is configured from a bar section 16 and an overhang section 17. The overhang section 17 is brought into a state of being hung on a string 4 by moving the string hanging part 15 to a position away from a sounding board 1 by the displacement mechanism 18. Elastic force is generated in the string 4, and a vibrator 31 is gently pressed against a bridge 3 by a third-class lever action. If there is a possibility that pressing force becomes excessive due to strong tension of the string 4, the pressing force can be appropriately adjusted by the fine adjustment mechanisms 21, 22.

Description

Audio equipment

The present invention relates to an acoustic device, particularly to an acoustic device that can be attached to a piano.

Traditionally, there are pianos that can be played automatically. Even in Japan, it was exhibited as a store interior, mainly in the 1980s and 1990s. However, as with a performer playing, there are many failures because it involves physical drive such as hitting a string with a hammer. Even if it breaks down due to long-term use, the piano tuner cannot repair the electricity, and there are no parts for repair and replacement. Due to these circumstances, the handling of pianos that can be played automatically is still slightly continuing, but it is decreasing in the long run.

On the other hand, even in ordinary households, there were times when grand pianos and upright pianos were purchased, but nowadays they are often left unused. In addition, many pianos are distributed in the second-hand market at a relatively low price.

Furthermore, some electronic pianos reproduce the soundboard of a live piano (grand piano or upright piano) as a natural musical instrument and use it as an acoustic device (for example, Patent Document 1).

In recent years, with the development of digital technology, it has become easier to play music on electronic devices.

Based on the above complex background, it has been attempted to play music by acoustic signals from electronic devices such as audio players, personal computers, and smartphones, using the soundboards of existing grand pianos and upright pianos as acoustic devices. For example, Patent Document 2).

A piano equipped with such a sound device allows the performer to play at the same time as the music is played, and is suitable for new playing methods and music education.

Japanese Unexamined Patent Publication No. 2017-067913 JP-A-2015-114457

In the above acoustic device, vibration is transmitted to the soundboard via a vibration mechanism that converts an electric signal into vibration. Therefore, if there is a problem in transmitting vibration to the soundboard, music cannot be played. Therefore, the mounting structure between the vibration mechanism and the soundboard is important.

In the above acoustic device, the vibration mechanism or the vibrator of the vibration mechanism is directly fixed to the soundboard. This ensures that the vibration is transmitted to the soundboard.

Further, it is preferable to press the soundboard by applying a certain load via the vibrator. This prevents the oscillator from repelling and separating from the soundboard during vibration. If the vibrator is separated from the soundboard even a little, the vibration is not transmitted to the soundboard.

However, if the soundboard is processed or a load is applied directly to the soundboard, the original tone of the soundboard may not be reproduced. That is, there is a risk of impairing the original function of the piano. It is also reported that the fact that the acoustic device is inside the piano itself causes noise and resonance. In this respect as well, the original function of the piano may be impaired.

In addition, it is necessary to make major modifications to the installation, and once it is installed, it is difficult to remove it, and even if it is removed, processing marks will remain and the evaluation value at the time of second-hand sales will be low, so let's install the vibration mechanism as a trial. It does not become an opportunity to do so.

The present invention solves the above-mentioned problems, and an object of the present invention is to provide an acoustic device having a mounting structure that does not impose a mechanical load on the soundboard.

The present invention that solves the above problems is an acoustic device attached to any of a plucked string instrument, a bowed string instrument, and a plucked string instrument that transmits the vibration of a string to a board via a piece. The acoustic device is provided on a vibration mechanism that vibrates the piece via a vibrator based on an acoustic signal from the outside, a base portion connected to the vibration mechanism, and an end portion side of the base portion. A string holding portion that presses the string from the opposite side of the plate, a through hole provided substantially in the center of the base portion, a rod portion provided so as to be able to displace the inside of the through hole in the axial direction, and the tip of the rod portion. It is composed of an overhanging portion provided in the rod axis in a direction substantially orthogonal to the rod axis, and the string hanging portion for hanging the strings from the plate side and the string hanging portion are placed on the plate between the position corresponding to the piece and the position corresponding to the string holding portion. It is provided with a displacement mechanism that displaces the rod portion toward and away from the position, and a fine adjustment mechanism that adjusts the axial positional relationship between the rod portion and the overhanging portion.

In the above invention, preferably, the displacement mechanism is set so that the chord hanging portion is located away from the plate so that the overhanging portion is hung on the chord and the chord hanging portion is located close to the plate. The hook between the overhanging portion and the string is released.

The displacement mechanism generates an elastic force on the strings, and the vibrator is gently pressed against the bridge by the third-class leverage action. If the tension of the strings is strong and there is a risk that the pressing force will be excessive, the fine adjustment mechanism can be used to adjust the pressing force to an appropriate level.

In the above invention, preferably, the displacement mechanism is capable of rotating the rod portion about an axis, and displaces the overhanging portion in the chord direction and the chord orthogonal direction.

By setting the overhanging part in the direction of the strings, the overhanging part can be inserted between the strings. By setting the overhanging part in the direction orthogonal to the strings, the strings are securely hooked.

In the above invention, preferably, the displacement mechanism displaces the chord hook portion to a position approaching the plate and a position moving away from the plate by rotating the rod portion around an axis.

By screwing in the rod part, it can be attached while adjusting the pushing pressure.

In the above invention, the tension acting on the strings is preferably 10 kgf or more.

Especially when the tension of the strings is strong, the effect of the fine adjustment mechanism becomes remarkable.

The present invention that solves the above problems is an acoustic device attached to any of a plucked string instrument, a bowed string instrument, and a plucked string instrument that transmits the vibration of a string to a board via a piece. The acoustic device is provided on a vibration mechanism that vibrates the piece via a vibrator based on an acoustic signal from the outside, a base portion connected to the vibration mechanism, and an end portion side of the base portion. A string holding portion that presses the string from the opposite side of the plate, a through hole provided substantially in the center of the base portion, a rod portion provided so as to be able to displace the inside of the through hole in the axial direction, and the tip of the rod portion. It consists of an overhanging portion that is provided in the rod axis in a direction substantially orthogonal to the rod axis. It is provided with a displacement mechanism that displaces the string hanging portion to a position approaching the plate and a position moving away from the plate by rotating the string hanging portion.

By adjusting the pressing force while screwing in the rod part, an effect similar to the effect of the fine adjustment mechanism can be obtained.

The present invention that solves the above problems is a method of attaching an audio device. The audio device is arranged so that the string holding portion is distal to the piece on the string operating side.

The string operation side is the side that repels the strings in a plucked string instrument, the side that rubs the strings in a plucked string instrument, and the side that strikes the strings in a plucked string instrument. In the case of a piano, it is on the keyboard side.

By pressing the strings distal to the piece, the strings are almost never muted. This enables simultaneous performance.

According to the acoustic device according to the present invention, no mechanical load is applied to the board of the musical instrument. As a result, the original tone of the musical instrument can be maintained. That is, it can be played as a musical instrument.

In addition, it is easy to install and remove, and no processing marks are left on the instrument board.

It can be attached to any of plucked string instruments, bowed string instruments, and plucked string instruments, but it is also applicable especially when the tension of the strings is strong.

Schematic cross section of a grand piano An exploded perspective view of a grand piano Detailed configuration diagram of a grand piano Detailed configuration diagram of a grand piano An exploded perspective view of an upright piano Schematic configuration of an upright piano Detailed configuration diagram of an upright piano Detailed configuration diagram of an upright piano Side view of audio equipment Cross-sectional view of the vibration mechanism Operation explanatory diagram Mounting method Fine adjustment mechanism Operation explanatory diagram (variation example) Application example to bowed string instrument

-Overview of the grand piano-
FIG. 1 is a schematic cross-sectional view of a grand piano. FIG. 2 is an exploded perspective view. The basic structure of a grand piano will be briefly explained.

A grand piano consists of a keyboard, hammer, damper, strings, soundboard, pieces, etc.

The strings are stretched horizontally and in front of the player.

When you hit the keyboard, the damper goes up and the hammer hits the strings to vibrate. It is transmitted to the soundboard through the vibrating piece of the string and enlarged. When you release your hand from the keyboard, the damper goes down and the vibration is stopped.

Also, if all the dampers are raised by the pedal, other strings that have not been struck will also resonate, creating a sound peculiar to a piano.

The grand piano has an upper lid (large roof) that covers the strings, and by lifting this, a richer volume can be produced. It is fixed at an angle of about 45 degrees by a support rod. This makes the sound directional.

The soundboard and sound stick are located under the strings, and the vibration of the strings transmitted through the bridge is efficiently transmitted to the air. The soundboard is grained and the direction is generally the same as the length of the piece. The sound stick is located on the opposite side of the soundboard piece, and is also grained.

The sound bar is arranged in the direction of the grain of the sound board, that is, in the direction of intersection with the length of the piece. The sound stick acts as a framework that supports the sound board. The sound transmitted through the soundboard / sound bar has a predetermined ratio between the grain direction and the grain crossing direction. The sound bar helps propagate the vibration in the cross-grain direction of the soundboard, which causes the vibration to be transmitted uniformly throughout the soundboard.

The soundboard 1 is supported horizontally on the support. A plurality of sound bars 2 are arranged side by side on the lower surface of the sound board 1. On the upper surface of the soundboard 1, the piece 3 is extended so as to intersect the two-axis direction of the sound bar.

FIGS. 3 and 4 are detailed configuration diagrams around the piece. For convenience, the keyboard side is in front.

The 4th end of the string is fixed with a pin. On the front side of the pin, the string 4 is continuous with the piece 3 via the front and rear piece pins. Piece 3 has a short piece and a long piece. The short piece is continuous with the low-pitched string, and the long piece is continuous with the middle and high-pitched strings. As a result, the vibration of the string 4 is transmitted to the piece 3.

The sound device 10 is attached so as to come into contact with the piece 3 via the string 4. In the illustrated example, two acoustic devices, a short piece and a long piece, are attached.

By the way, the soundboard 1 is designed to resonate in a wide range from high to low. In other words, the soundboard 1 selects a range, and the treble is reverberated on the treble side and the bass is reverberated on the bass side. When an acoustic signal including high to low sounds is input to the two acoustic devices, the soundboard 1 appropriately selects a range. As a result, music is reproduced in a wide range from high to low.

～ Overview of upright piano ～
The sound device 10 can be applied to an upright piano as well as a grand piano.

FIG. 5 is an exploded perspective view of an upright piano. FIG. 6 is a schematic configuration diagram of the inside as viewed from the front. The basic structure of an upright piano will be explained in comparison with a grand piano.

In a grand piano, the frame, strings, soundboard, etc. are arranged in the horizontal direction, whereas in an upright piano, the frame, strings, soundboard, etc. are arranged in the vertical direction. As a result, the upright piano requires less installation space than the grand piano.

In a grand piano, the hammer falls down naturally due to recoil and gravity, whereas in an upright piano, the hammer is returned by a spring.

Other configurations are the same as the grand piano, and the operation is also the same as the grand piano. That is, when the keyboard is hit, the damper is raised and the hammer hits the strings to vibrate. This vibration is transmitted to the soundboard from the bridge, which is one of the ends of the string vibration, and is expanded. When you release your hand from the keyboard, the damper goes down and the vibration is stopped.

A piece 3 is provided on one side of the soundboard 1, and a plurality of sound sticks 2 are provided on the opposite side. Multiple stanchions support the upright piano vertically.

FIGS. 7 and 8 are detailed configuration diagrams around the piece. For convenience, the keyboard side is in front. The composition around the pieces of the upright piano is the same as that of the grand piano.

~ Audio equipment ~
FIG. 9 is a side view of the audio device.

The acoustic device 10 includes a vibration mechanism 11, a base portion 12, a string holding portion 13, a through hole 14, a string hooking portion 15, and a displacement mechanism 18.

The vibration mechanism 11 is the main configuration of the acoustic device 10, and will be described later separately. When the acoustic device is attached, the oscillator 31 of the vibration mechanism 11 comes into contact with the surface of the piece 3.

The base portion 12 is a plate-shaped member, and is arranged so that the longitudinal direction coincides with the chord direction. The base portion 12 is connected to the vibration mechanism 11. For example, the vibration mechanism 11 may be fitted to the ring portion provided at the end portion. The end portion of the base portion 12 and the vibration mechanism 11 may be integrally molded so as to be continuous. The material is not limited, but it is preferable that it has appropriate elasticity and rigidity.

The string pressing portion 13 extends in the direction orthogonal to the plate surface at the end portion of the base portion 12 opposite to the vibration mechanism. When the audio device is attached, the plurality of strings 4 are pressed from the opposite side of the soundboard 1. The string pressing portion 13 has a longitudinal direction in the direction orthogonal to the strings.

The through hole 14 penetrates in the plate thickness direction at substantially the center of the base portion 12.

The string hanging portion 15 is composed of a rod portion 16 and an overhanging portion 17. The rod portion 16 is provided so as to be freely displaceable in the through hole in the direction of the rod axis and the direction around the rod axis.

The overhanging portion 17 is provided at the tip of the rod portion 16 and overhangs in a direction substantially orthogonal to the rod axis. When the audio device is attached, it has a longitudinal direction in the direction orthogonal to the strings, and the strings 4 are hung from the soundboard 1 side between the position corresponding to the bridge and the position corresponding to the string holding portion.

In the acoustic device 10, the base portion 12 serves as a lever body, the string pressing portion 13 serves as a fulcrum, the string hooking portion 15 serves as a force point, and the oscillator 31 serves as an action point.

The displacement mechanism 18 displaces the string hanging portion 15 to a position approaching and a position away from the soundboard 1. The displacement mechanism 18 is, for example, a lever cam.

The lever cam 18 is composed of an L-shaped lever and a base. The L-shaped lever is pin-coupled to the rod portion 16 head and also to the base portion. When the L-shaped lever rotates with respect to the base portion, the rod portion 16 is displaced in the rod axial direction via the pin coupling.

FIG. 10 is a schematic cross-sectional view of the vibration mechanism 11. The vibration mechanism 11 vibrates based on an acoustic signal from the outside.

The vibration mechanism 11 includes a permanent magnet 32, a yoke 33 surrounding the permanent magnet 32, and a voice coil 34 supported by the yoke 33 so as to be located in the magnetic gap by the damper 35 (see FIGS. 9 and 10). ). A rod-shaped oscillator 31 as an output end is fixed to the voice coil 34. The outer circumference of the yoke member 33 is covered with a case. The damper 35 is a flat leaf spring cut out into a predetermined shape.

In the vibration mechanism 11, the oscillator 31 vibrates due to the voice coil 34 when the current corresponding to the acoustic signal is supplied to the voice coil 34.

～ Installation / Removal ～
11 and 12 are diagrams illustrating an operation of attaching the acoustic device 10 so as to abut on the piece 3 via the string 4.

First, the audio device 10 is placed distal to the piece 3 when viewed from the keyboard. The sound device 10 is tilted to bring the oscillator 31 into contact with the surface of the piece 3. The L-shaped lever of the lever cam 18 is in the raised state.

The overhanging portion 17 is displaced in the chord direction via the lever cam 18, and the overhanging portion 17 is inserted between the strings. Further, the string pressing portion 13 is brought into contact with the plurality of strings 4. After that, the overhanging portion 17 is displaced in the direction orthogonal to the strings via the lever cam 18.

When the L-shaped lever of the lever cam 18 is pushed down, the rod portion 16 moves in the direction of the base portion 12 due to the cam action. Along with this, the string hanging portion 15 is set at a position away from the soundboard 1. The overhanging portion 17 is in a state of being caught on the string 4.

The elastic force of the string 4 is generated at the string hanging portion 15, which is the point of effort. A force that presses the oscillator 31 against the piece 3 acts on the string pressing portion 13 as a fulcrum. In this way, the base portion 12 acts as a third-class lever. As a result, the pressing force of the oscillator 31 against the piece 3 is appropriately adjusted and acts reliably.

In other words, the acoustic device 10 is securely attached to the string 4, and the oscillator 31 is gently pressed against the piece 3 by the third-class leverage action. The vibration of the oscillator 31 is transmitted to the soundboard 1 via the piece 3.

Next, the operation of removing the audio device 10 from the string 4 will be described (not shown).

When the L-shaped lever of the lever cam 18 is pushed up, the rod portion 16 moves in one direction of the soundboard. Along with this, the string hanging portion 15 is set to a position close to the soundboard 1. The overhanging portion 17 is released from being caught on the string 4. The elastic force of the string 4 is also released.

The overhanging portion 17 is displaced in the chord direction via the lever cam 18, and the overhanging portion 17 is removed from between the strings.

As described above, the installation / removal of the audio device 10 is easy.

~ Effect ~
By the way, if the oscillator 31 is separated from the piece 3 even a little, the vibration is not transmitted to the soundboard 1. If the pressing force against the piece 3 is too weak, the oscillator 31 jumps and causes a chattering sound. On the other hand, if the pressing force of the vibrator 31 against the piece 3 is excessive, the vibration of the vibrator 31 is constrained, and as a result, the soundboard 1 does not vibrate.

In the sound device 10, the pressing force of the oscillator 31 against the piece 3 is appropriately adjusted. As a result, music can be played appropriately.

In addition, no mechanical load is applied to the soundboard 1 when the audio device 10 is attached. Further, by arranging the acoustic device 10 distal to the piece 3 when viewed from the keyboard, there is almost no influence on the strings 4. As a result, when playing as a piano, the original tone of the piano can be maintained.

~ Fine adjustment mechanism ~
FIG. 13 is a configuration diagram of the fine adjustment mechanisms 21 and 22.

The example of attaching the audio device 10 to the piano has been described above. The tension of the piano strings is stronger than the tension of the guitar and violin strings. In other words, piano strings are less likely to deform than guitar or violin strings. Therefore, due to excessive deformation of the strings, the pressing force of the oscillator 31 against the piece 3 tends to be strong. Excessive pressing force restrains the vibration of the vibrator 31. Further, an excessive pressing force destroys the acoustic device 10.

By the way, the space (distance) between the string 4 and the surface of the piece 3 is slightly different depending on the type of piano. In addition, the piano has a large number of strings, and the tension of the strings differs depending on the strings. There is a risk of problems due to differences in distance and tension.

On the other hand, the fine adjustment mechanism 21 may be added to the audio device 10.

In the string hanging portion 15, the rod portion 16 and the overhanging portion 17 can be separated. The fine adjustment mechanism 21 is provided at the joint portion between the rod portion 16 and the overhanging portion 17.

For example, a screw hole is provided on the end surface of the rod portion 16, and a screw is provided on the overhanging portion 17 to be screwed. At the time of screwing, the degree of screwing may be adjusted, or may be selected from a plurality of overhanging portions 17 having different screwing amounts. A nut may be inserted into the threaded portion and the nut size may be changed as appropriate.

The rod axial position of the overhanging portion 17 may be finely adjusted by providing the rod portion 16 with an expansion / contraction mechanism.

The fine adjustment mechanism 21 is not limited to the above if the position of the overhanging portion 17 and the rod portion 16 can be adjusted in the rod axis direction, in other words, if the position of the overhanging portion 17 can be finely adjusted in the rod axis direction.

The fine adjustment mechanism 21 allows fine adjustment of the positional relationship between the overhanging portion 17 and the string 4. As a result, even if there is almost no displacement of the string 4, the pressing force can be adjusted to an appropriate level.

Further, the string pressing portion 13 presses the string 4 from the opposite side of the soundboard 1, while the overhanging portion 17 hangs the string 4 from the soundboard 1 side. By the way, the thickness of the string 4 differs depending on the string. In particular, since the number of strings is large in a piano, there is a risk that problems may occur due to differences in the thickness of the strings.

On the other hand, the fine adjustment mechanism 22 may be added to the audio device 10.

The string holding portion 13 is separable from the base portion 12. The fine adjustment mechanism 22 is provided at the joint portion between the string pressing portion 13 and the base portion 12.

A fitting hole is provided at a position corresponding to the connection of the base portion 12, and the rod portion of the string pressing portion 13 is fitted. If the fitting hole and the rod portion are not circular (for example, hexagonal), they will not rotate and will be stably coupled. At that time, the insertion member 22A is detachably provided on the head of the string holding portion 13 rod portion. The positional relationship between the string pressing portion 13 and the base portion 12 can be adjusted by the presence or absence of the interposing member or by changing the size of the interposing member. As a result, the positional relationship between the string pressing portion 13 and the overhanging portion 17 can be adjusted.

-Example of modification of fine adjustment mechanism-
The fine adjustment mechanism 21 can be modified in various ways. If the positional relationship between the overhanging portion 17 and the rod portion 16 in the rod axis direction can be adjusted, in other words, the position of the overhanging portion 17 may be adjusted in the rod axis direction.

In the fine adjustment mechanism 21, a fitting hole may be provided in the end surface of the rod portion 16 to fit the overhanging portion 17, and an insertion member may be detachably provided on the head of the overhanging portion 17.

The fine adjustment mechanism 22 can be deformed in various ways. If the positional relationship between the string pressing portion 13 and the base portion 12 can be adjusted, in other words, the positional relationship between the string pressing portion 13 and the overhanging portion 17 may be adjusted.

In the fine adjustment mechanism 22, the string pressing portion 13 and the base portion 12 may be connected via the insertion member 22B (not shown) without a head. Further, the string pressing portion 13 and the base portion 12 may be screwed together to adjust the degree of screwing at the time of screwing, or the nut may be inserted into the screwed portion to change the nut size. ..

If the positional relationship between the overhanging portion 17 and the string pressing portion 13 can be adjusted by adjusting the position of the overhanging portion 17 by the fine adjustment mechanism 21, only the fine adjustment mechanism 21 may be added.

~ Displacement mechanism deformation example ~
Although the lever cam 18 is given as an example of the displacement mechanism 18, various deformations are possible as long as the mechanism displaces the chord hanging portion 15 between the position approaching and the position away from the soundboard 1. For example, instead of the lever cam 18, a screw-in type displacement mechanism 19 is used.

FIG. 14 is an operation explanatory view of the screw-in type displacement mechanism 19. The screw-in type displacement mechanism 19 is integrated with the rod portion 16 and has a knob on the head. The rod portion 16 and the through hole 14 form a screw mechanism. When the knob is rotated, the rod portion 16 is displaced in the direction of the rod axis while rotating.

The overhanging portion 17 is displaced in the chord direction via the knob of the screw-in type displacement mechanism 19, and the overhanging portion 17 is inserted between the strings. If the longitudinal direction of the knob and the longitudinal direction of the overhanging portion 17 match, it is easy to imagine the direction of the overhanging portion 17. Further, the string pressing portion 13 is brought into contact with the plurality of strings 4. After that, the overhanging portion 17 is displaced in the direction orthogonal to the strings via the knob of the screw-in type displacement mechanism 19.

When the knob of the screw-in type displacement mechanism 19 is rotated, the rod portion 16 moves in the direction of the base portion 12. Along with this, the string hanging portion 15 is set at a position away from the soundboard 1. The overhanging portion 17 is in a state of being caught on the string 4. Due to the elastic force of the string 4, the base portion 12 acts as a third-class lever, and the vibrator 31 is pressed against the piece 3.

When the knob of the screw-in type displacement mechanism 19 is rotated in the opposite direction, the rod portion 16 moves in the soundboard 1 direction. Along with this, the string hanging portion 15 is set to a position close to the soundboard 1. The overhanging portion 17 is released from being caught on the string 4. The elastic force of the string 4 is also released.

The overhanging portion 17 is displaced in the chord direction via the knob of the screw-in type displacement mechanism 19, and the overhanging portion 17 is removed from between the strings.

By the way, the elastic force of the string 4 selectively acts by pushing down / pushing down the L-shaped lever of the lever cam 18. Piano strings are less likely to deform than guitar or violin strings. If it is excessively deformed, the pressing force of the oscillator 31 against the piece 3 may become excessive, and the vibration of the oscillator 31 may be restrained or the acoustic device 10 may be destroyed.

On the other hand, in the screw-in type displacement mechanism 19, the position of the overhanging portion 17 can be adjusted in the rod axis direction depending on the degree of knob rotation, and the pressing force can be adjusted to an appropriate level.

That is, the screw-in type displacement mechanism 19 has the features of the lever cam type displacement mechanism 18 and the fine adjustment mechanism 21.

Further, if the same effect as that of the fine adjustment mechanism 21 can be obtained only by the screw-in type displacement mechanism 19, the fine adjustment mechanism 21 does not have to be indispensable.

The piano strings are less likely to be deformed than the guitar or violin strings, the movement of the rod portion 16 is short, and the screwing operation of the screw-in type displacement mechanism 19 is not a burden.

-Application to other musical instruments-
Although an example of attaching an acoustic device to a piano has been described, it can be applied to a plucked string instrument, a bowed string instrument, and a plucked string instrument. Plucked string instruments, bowed string instruments, and plucked string instruments are common in that the strings are stretched along the board and the vibration of the strings is transmitted to the board through the pieces.

Plucked string instruments produce sound by plucking the strings. Examples include guitar, bass, harp, kin, shamisen, harpsichord, sitar and the like. Bowed strings make sounds by rubbing the strings with a bow or stick. Examples include violins, violas, cellos, contrabass and kokyu. In plucked string instruments, the strings are struck in some way to produce sound. An example is the piano.

However, in the harp, the strings are not stretched along the board, and the "board" in the specification should be read as "virtual surface on the support side" as appropriate.

The invention of the present application is particularly suitable for a stringed instrument such as a piano or a contrabass, in which the tension of the strings is strong.

FIG. 15 is an image diagram when the sound device 10 is attached to the contrabass. If there is a risk that the strings will vibrate due to the vibration of the acoustic device 10 and a dissonant sound will be generated, the acoustic device 10 is arranged proximal to the piece when viewed from the neck, and the oscillator 31 is brought into contact with the surface of the piece. The string pressing portion 13 suppresses unnecessary vibration of the strings. When there is a request for simultaneous performance as in the case of a piano, the acoustic device 10 is arranged proximal to the piece when viewed from the neck, and the oscillator 31 is brought into contact with the surface of the piece.

～ Remark 1 ～
The inventor of the present application has already proposed an acoustic device to be attached to a stringed instrument mainly for acoustic guitars (Patent No. 5849172). The vibration mechanism is attached to the strings of the guitar.

The acoustic guitar piece is provided at the end of the string. Therefore, the mounting position is uniquely determined. If you attach a vibration mechanism to the strings of an acoustic guitar, the vibration of the strings will change. Therefore, it is difficult to use it as a musical instrument with an audio device attached. Further, the strings of the acoustic guitar are exposed, and the attachment / detachment of the acoustic device is relatively easy. When the acoustic guitar is used as a musical instrument, the acoustic device may be removed. It is not intended to be used as a musical instrument with the sound device attached to an acoustic guitar or the like.

Also, as the audio device operates, the strings also vibrate, causing dissonance. Therefore, the string presser (mute) is indispensable. From this point as well, it is not intended to be used as a musical instrument with the acoustic device attached to an acoustic guitar or the like.

Next, the inventor of the present application proposes an acoustic device to be attached to a piano (Patent 6304576, Patent 6390069). The structure of a piano is more complicated than that of a guitar, and it is laborious to install. Once installed, it is relatively difficult to remove the audio device. On the other hand, in the case of piano, there are many requests that performers want to play at the same time as music is played because of new playing methods and music education. Therefore, it is important to consider the mounting position of the vibration mechanism. In other words, the guitar sound device mounting mechanism (using strings) cannot be directly used for the piano.

By the way, a major piano maker has been trying to use a piano soundboard as an acoustic device for an electronic device. A major piano maker is familiar with the structure of a piano and transmits vibrations directly to the soundboard in order to maximize the characteristics of the soundboard. However, it is difficult to attach the vibration mechanism directly to the soundboard.

On the other hand, the inventor of the present application tries to transmit the vibration of the vibration mechanism to the sound bar by using the support column as the mounting mechanism, or uses the sound bar as the mounting mechanism to transmit the vibration of the vibration mechanism to the sound bar. I tried to tell it to you and tried and errored.

After that, as a result of repeated trial and error, the guitar is a plucked string instrument and the piano is a plucked string instrument, both of which have the characteristics of a stringed instrument. When the tension is strong like a piano string, we focused on the fact that the effect of the vibration of the string due to the operation of the acoustic device is small. Therefore, it was found that even if the vibration mechanism is attached to the piano strings, the vibration of the strings is not affected if the piano strings are located distal to the piece when viewed from the keyboard. That is, it can be used (simultaneously played) as a musical instrument with an audio device attached. Through the above thinking process, the present invention was completed.

～ Remark 2 ～
The tension of the strings of a guitar or a violin is 10 kgf / piece or less. When the tension of a string is weak like a guitar or a violin, the string is easily deformed by applying a relatively weak force. When the string hook pulls up the string, the string shape follows. As a result, there is no possibility that an excessive elastic force is generated, and the position adjustment is relatively easy due to the displacement of the strings.

On the other hand, the tension of the cello strings is about 10 to 20 kgf / line, the tension of the contrabass strings is about 25 to 35 kgf / line, and the tension of the piano strings is about 75 to 90 kgf / line, which are relatively strong. Even if a strong force is applied, the strings are not easily deformed. In addition, if a strong force is applied, the device may be damaged. Therefore, the displacement of the string hook is relatively short. As a result, the fine adjustment mechanism becomes important.

That is, the present invention is particularly suitable when the tension of the strings is strong, such as in a piano or a contrabass.

1 Soundboard 2 Sound bar 3 Piece 10 Sound device 11 Vibration mechanism 12 Base part 13 String holding part 14 Through hole 15 String hanging part 16 Rod part 17 Overhanging part 18 Displacement mechanism (lever cam type)
19 Displacement mechanism (screw type)
21 Fine adjustment mechanism (string hook side)
22 Fine adjustment mechanism (string presser side)
31 Oscillator 32 Permanent magnet 33 York 34 Voice coil 35 Damper

Claims

An acoustic device that can be attached to any of a plucked string instrument, a bowed string instrument, or a plucked string instrument that transmits the vibration of a string to a board via a piece.
A vibration mechanism that vibrates the piece via an oscillator based on an acoustic signal from the outside,
The base part connected to the vibration mechanism and
A string pressing portion provided on the end side of the base portion and pressing the strings from the opposite side of the plate, and a string pressing portion.
A through hole provided in the substantially center of the base portion and
The rod portion is provided so as to be freely displaceable in the through hole in the axial direction, and the rod portion is provided at the tip of the rod portion and overhangs in a direction substantially orthogonal to the rod axis. Between the string hanging part where the string is hung from the plate side,
A displacement mechanism that displaces the string hook to a position that approaches and a position that moves away from the plate.
An audio device including a fine adjustment mechanism for adjusting the axial positional relationship between the rod portion and the overhanging portion.
The displacement mechanism is
By locating the string hanging portion away from the board, the overhanging portion is placed on the string.
The acoustic device according to claim 1, wherein the string hooking portion is positioned close to the plate to release the hooking between the overhanging portion and the string.
The acoustic device according to claim 1 or 2, wherein the displacement mechanism is capable of rotating the rod portion about an axis and displaces the overhanging portion in a chord direction and a chord orthogonal direction.
The acoustic device according to any one of claims 1 to 3, wherein the displacement mechanism displaces the chord hanging portion between a position approaching and a position away from the plate by rotating the rod portion around an axis. ..
The acoustic device according to any one of claims 1 to 4, wherein the tension acting on the strings is 10 kgf or more.
An acoustic device that can be attached to any of a plucked string instrument, a bowed string instrument, or a plucked string instrument that transmits the vibration of a string to a board via a piece.
A vibration mechanism that vibrates the piece via an oscillator based on an acoustic signal from the outside,
The base part connected to the vibration mechanism and
A string pressing portion provided on the end side of the base portion and pressing the strings from the opposite side of the plate, and a string pressing portion.
A through hole provided in the substantially center of the base portion and
The rod portion is provided so as to be freely displaceable in the through hole in the axial direction, and the rod portion is provided at the tip of the rod portion and overhangs in a direction substantially orthogonal to the rod axis. Between the string hanging part where the string is hung from the plate side,
A displacement mechanism that displaces the string hanging portion between a position approaching and a position away from the plate by rotating the rod portion around an axis.
An audio device characterized by being equipped with.
In the acoustic device according to any one of claims 1 to 6.
So that the string holding part is distal to the piece with respect to the string operating side.
How to install an audio device, characterized by placement.