JP6304576B1 - Acoustic device and acoustic system - Google Patents

Abstract

Provided is an acoustic device having a mounting structure that does not apply a mechanical load to a soundboard of a piano. The acoustic device 10 includes a support post fixing part 11, an overhang part 12, a vibrator 13, and a contact assisting part 14. The column fixing part 11 is fixed to the column 3. In the illustrated example, four L-shaped angles are fixed by the tension of the wire. The overhanging portion 12 protrudes from the column fixing portion 12 toward the sounding rod 2. The position can be adjusted vertically and horizontally. The vibrator 13 is provided substantially at the tip of the overhanging portion 12, and the vibrator 31 of the vibrator 13 is brought into contact with the surface of the sounding rod 2 through the contact assisting portion 14. The contact assistant 14 assists the vibrator 31 of the vibrator 13 to contact the sounding rod 2. Due to this contact state, the vibration of the vibrator 31 is transmitted to the soundboard 1 through the soundbar 2. As a result, the acoustic device 10 operates.

Description

  The present invention relates to a sound device and a sound system, and more particularly, to a sound device and a sound system using a soundboard of a piano.

  Traditionally, there are pianos that can be played automatically. In Japan, it was exhibited as an interior of the store from 1980s to 1990s. However, as the performer performs, it involves a physical drive such as hitting a string with a hammer, so there are many failures. Even if it breaks down due to long-term use, the piano tuner cannot repair electricity, and there are no parts for repair and replacement. Under such circumstances, handling of pianos that can be automatically played is decreasing.

  On the other hand, there are times when grand pianos and upright pianos have been purchased even in ordinary households, but they are often not used at present. In addition, many pianos are also available in the secondhand market at a relatively low price.

  Furthermore, some electronic pianos reproduce a soundboard of a raw 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.

  With the composite background described above, it has been attempted to reproduce music by using an acoustic signal from an electronic device such as a smartphone using a soundboard of an existing grand piano or upright piano as a sound device (for example, Patent Document 2). .

  A piano equipped with such an acoustic device is suitable for music education because a performer can perform simultaneously with music reproduction.

JP 2017-067913 JP-A-2015-114457

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

  In the acoustic device, the vibrator or the vibrator of the vibrator is directly fixed to the soundboard. This ensures that vibrations are transmitted to the soundboard.

  However, if the soundboard is processed, the original tone color of the soundboard may not be reproduced. That is, the original function of the piano may be impaired.

  In addition, once attached, it is difficult to remove, and even if it is removed, it is not an opportunity to attach a vibration exciter to the test because the processing mark remains and the appraisal value at the time of pre-sale is low.

  This invention solves the said subject, and it aims at providing the audio equipment provided with the attachment structure which does not apply a mechanical load to a soundboard.

  This invention which solves the said subject is an audio equipment attached to a piano. The acoustic device includes a column fixing unit fixed to the piano column, a projecting unit projecting from the column fixing unit, a vibration unit provided at the distal end of the projecting unit and configured to vibrate based on an external acoustic signal, And an abutting assisting part for abutting the vibrator of the exciting part to the sounding rod.

  Due to this contact state, the vibration of the vibrator is transmitted to the soundboard via the soundbar. As a result, the acoustic device operates. In this contact state, no load is generated on the soundboard.

  Preferably, in the above invention, the contact assisting portion has a clamping mechanism for clamping the sounding rod.

  As a result, no load is generated on the sounding stick.

  Preferably, in the above invention, the contact assisting portion includes a biasing mechanism that biases the vibrator toward the sounding rod.

  Thereby, even if a reaction force acts on the vibrator, the contact state can be maintained.

  In the above invention, preferably, the contact assisting portion includes a rotation mechanism that can rotate around the long axis of the vibrator.

  Thereby, the axial direction can be clamped with respect to an arbitrary sounding rod.

  This invention which solves the said subject is an acoustic system using the said acoustic apparatus. The acoustic system is configured to provide sound to a first acoustic device that is in contact with a high-frequency sounding sound bar, a second acoustic device that is in contact with a low-frequency sounding sound bar, the first acoustic device, and the second acoustic device. A sound source device for providing a signal.

  Thereby, music can be reproduced in a wide sound range from high to low.

  According to the acoustic device of the present invention, no mechanical load is applied to the soundboard. As a result, the original tone of the piano can be maintained.

  Moreover, it is easy to remove, and no processing mark is left on the soundboard. Remove the shaker to return to the original piano. Therefore, it becomes an opportunity to attach a vibration exciter to trial.

Schematic cross section of grand piano Exploded perspective view of grand piano A view of the soundboard from below Schematic perspective view of audio device Disassembled perspective view of upright piano A view of the soundboard from the back side Schematic perspective view of the contact assistant Partial cross-sectional perspective view of a contact assisting portion Detailed cross-sectional view of the contact assistant Damper plan view Modification of sound system

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

  A grand piano is composed of a keyboard, hammer, damper, string, soundboard, bridge, and the like.

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

  When you hit the keyboard, the damper rises and the hammer hits the strings and vibrates. This vibration is propagated from the bridge, which is one of the ends of the string vibration, to the soundboard and expanded. When you take your hand off the keyboard, the damper goes down and the vibration stops.

  Also, if all the dampers are raised by the pedal, other strings that are not struck will resonate, creating a unique sound of the piano.

  The grand piano has an upper lid (large roof) that covers the strings, and you can raise the volume by lifting it. This is fixed at about 45 degrees diagonally by a support bar. This makes the sound directional.

  The soundboard and the soundbar will be described in more detail.

  The soundboard / sound stick is located under the string and efficiently transmits the vibration of the string transmitted through the bridge to the air. The soundboard is generally made of wood and its direction generally matches the length direction of the bridge.

  The sounding bar is located on the opposite side of the soundboard bridge, and is also wooded in a square.

  The sounding bar is arranged in a direction crossing the sounding board grain direction, that is, the length direction of the bridge. The sounding rod plays the role of a framework that supports the soundboard. The sound transmitted through the soundboard / sound bar is approximately a predetermined ratio in the grain direction and the grain crossing direction. The sounding bar assists the propagation of vibrations in the direction across the grid of the sounding board, so that the vibrations are uniformly transmitted throughout the sounding board.

  FIG. 3 is a view of the soundboard 1 as viewed from below. A plurality of support columns 3 support the grand piano in the horizontal direction. The soundboard 1 is located on the column 3. A plurality of sound bars 2 are provided below the sound board 1. The dotted line in the figure indicates the bridge equivalent position.

~ Sound device ~
FIG. 4 is a schematic diagram of the acoustic device. The acoustic device according to the present embodiment will be described based on FIGS. 1, 3, and 4. The acoustic device 10 is added to FIGS. 1 and 2.

  The acoustic device 10 includes a support post fixing part 11, an overhang part 12, a vibrator 13, and a contact assisting part 14.

  The column fixing part 11 is fixed to the column 3. In the illustrated example, four L-shaped angles are fixed by the tension of the wire.

  The overhanging portion 12 protrudes from the support post fixing portion 11 toward the sounding rod 2. Position adjustment is possible in the vertical direction in FIG. 1 and in the horizontal direction in FIG. The components can be slidably coupled to adjust the position. Moreover, it has moderate elasticity as a leaf spring.

  The vibrator 13 is provided substantially at the tip of the overhanging portion 12, and the vibrator 31 of the vibrator 13 is brought into contact with the surface of the sounding rod 2 through the contact auxiliary portion 14.

  The vibrator 13 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 positioned in the magnetic gap by a damper 35 (see FIGS. 9 and 10). ). A rod-shaped vibrator 31 as an output end is fixed to the voice coil 34. The outer periphery of the yoke member 33 is covered with a case. The damper 35 is obtained by cutting a flat leaf spring into a predetermined shape.

  In the vibrator 13, the current corresponding to the acoustic signal is supplied to the voice coil 34, so that the vibrator 31 is vibrated by the voice coil 34.

  The contact assistant 14 assists the vibrator 31 of the vibrator 13 to contact the sounding rod 2. Details of the contact assisting portion 14 will be described with reference to FIGS.

  Strictly speaking, the acoustic device 10 includes a soundboard 1 and a soundbar 2.

  The acoustic device 10 is an example, and various modifications can be made as appropriate within the scope of the technical idea of the invention.

-Upright Piano Overview-
The acoustic device 10 can be applied to an upright piano as well as a grand piano.

  FIG. 5 is an exploded perspective view of the upright piano. FIG. 6 is a view of the soundboard 1 as seen from the back side. The basic structure of an upright piano will be described in comparison with a grand piano.

  A grand piano arranges a frame, a string, a soundboard, etc. in a horizontal direction, whereas an upright piano arranges a frame, a string, a soundboard, etc. in a vertical direction. Thereby, an upright piano does not need installation space compared with a grand piano.

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

  The other configuration is the same as that of the grand piano, and the operation is the same as that of the grand piano. In other words, when the keyboard is hit, the damper rises in conjunction with it, and the hammer strikes the string to vibrate. This vibration is propagated from the bridge, which is one of the ends of the string vibration, to the soundboard and expanded. When you take your hand off the keyboard, the damper goes down and the vibration stops.

  A bridge is provided on one surface of the soundboard 1, and a plurality of soundbars 2 are provided on the opposite surface. A plurality of support columns 3 support the upright piano in the vertical direction. The soundboard 1 is located inside the column 3.

  That is, the acoustic device in the grand piano and the acoustic device in the upright piano are almost the same except for the mounting direction.

-Details of contact assisting part-
FIG. 7 is a schematic perspective view of the contact assisting portion 14. FIG. 8 is a partial cross-sectional perspective view of the contact assisting portion. FIG. 9 is a detailed cross-sectional view of the contact assisting portion 14. Details of the contact assisting portion 14 will be described.

  The contact assistant 14 assists the vibrator 31 of the vibrator 13 to contact the sounding rod 2. The contact assisting portion 14 includes a clamping member 41 and a biasing member 42.

  The sandwiching member 41 is a substantially C-shaped member, and sandwiches the sounding rod 2 through the spacer 43. The spacer 43 is inserted between the side surface of the sounding rod 2 and the clamping member 41. A clamping hole is provided on one side of the clamping member 41, and the sounding rod 2 is securely clamped by the clamping screw 44.

  The clamping member 41 and the spacer 43 constitute a clamping mechanism.

  Appropriate rigidity is required for secure clamping. Although it may be made of resin, it is preferably made of metal (for example, aluminum).

  The urging member 42 is a plate member having elasticity. It may be made of metal, but is preferably made of resin.

  It is preferable that the biasing member 42 be easily deformed as compared with the holding member 41.

  The vibrator 31 penetrates substantially at the center of the urging member 42 and is engaged with the vibrator 31 so as to be rotatable around the major axis.

  Both ends of the urging member 42 are integrated with the clamping member 41 via the crimping screw 45. The vibrator 31 and the clamping member 41 are not directly connected.

  The vibrator 31, the clamping member 41, the urging member 42, and the crimping screw 45 constitute an urging mechanism. The vibrator 31 and the biasing member 42 constitute a rotation mechanism.

  The biasing member 42 does not operate when the vibrator 13 is not vibrated, but when the reaction force acts on the vibrator 31 during vibration, the vibrator 31 is biased toward the sounding rod 2 (in operation). Detail).

~ Operation ~
First, the operation of bringing the vibrator 31 into contact with the sounding rod 2 will be described.

  The column is arbitrarily selected from a plurality of columns, and the column fixing part 11 is fixed to the column 3.

  Using the position adjustment function of the overhanging portion 12, the vibrator 31 of the vibrator 13 is adjusted so as to be positioned near the sounding rod 2.

  The contact assisting portion 14 can be rotated around the long axis of the vibrator 31, and the clamping member 41 is fitted in the axial direction of the sounding rod 2. The sounding rod 2 is clamped by the clamping member 41.

  When the crimping screw 45 is tightened, the vibrator 31 approaches the surface of the sounding rod 2 through the biasing member 42. In this way, the contact state is finely adjusted.

  Thereby, the vibrator 31 is reliably brought into contact with the surface of the sounding rod 2.

  At this time, the weights of the vibrator 13 and the contact assisting portion 14 are supported by the column 3 via the column fixing unit 11. Further, no internal force is generated in the contact state. In other words, the vibrator 31 is not excessively pressed against the surface of the sounding rod 2.

  As a result, no external force acts on the sounding stick 2. Of course, no external force acts on the soundboard 1. In other words, no load is applied to the soundboard 1 or the soundbar 2.

  Next, the operation of the acoustic device 10 when the vibrator 13 is vibrated will be described.

  The acoustic signal is converted into the vibration of the vibrator 31, and the vibration is transmitted to the soundboard 1 via the soundbar 2 by the contact state. As a result, the acoustic device 10 operates. That is, music is played.

  The acoustic signal is not limited to a sound source related to piano performance. Other musical instruments, human singing voices, and composite sound sources of these may be used. These sound sources can be reproduced faithfully.

  When the vibrator 31 vibrates in the contact state, a reaction force from the sounding rod 2 is generated. In contrast, the biasing member 42 biases the vibrator 31 toward the sounding rod 2.

  Furthermore, the overhanging portion 12 acts as a leaf spring, and the wire of the column fixing portion 11 expands and contracts to absorb the reaction force.

  Thereby, the said contact state is maintained and music is reproduced stably. At this time, no load is applied to the soundboard 1 or the soundbar 2.

~effect~
The acoustic device 10 does not apply a mechanical load to the soundboard 1 or the soundbar 2. As a result, when used as a piano, the original tone of the piano can be maintained.

  Since the acoustic device 10 is attached from the lower side or the back side, the workability is good and the attachment is easy.

  Since it is attachment by the contact mechanism and the clamping mechanism, removal is easy. When removed, there is no processing mark left on the soundboard 1 or soundbar 2.

  It can be easily restored to its original state. Therefore, it becomes an opportunity to attach a vibration exciter to trial.

~ Remarks ~
Conventionally, a major piano manufacturer attempts to use a piano soundboard as an electronic device acoustic device. Major piano makers are familiar with the structure of the piano and transmit vibration directly to the soundboard in order to maximize the characteristics of the soundboard. Therefore, there is no opportunity to use the sounding stick.

  On the other hand, when the inventor transmitted vibration to the sounding rod as a test, sufficient sound was obtained. Compared to transmitting vibration directly to the soundboard, there was no difference in the amount of music you can enjoy.

  Then, the idea of using a sounding bar as a mounting structure was conceived, and the present invention was completed through trial and error. That is, if it is a sounding stick, a clamping mechanism can be applied.

~ Sound system ~
In the example of FIGS. 3 and 6, two acoustic devices 10A and 10B are provided. The acoustic device 10A is provided on the support 3A and abuts on the sounding bar 2A. The acoustic device 10B is brought into contact with the sounding rod 2B on the support 3B. The sounding bar 2A is on the high sound side, and the sounding bar 2B is on the low sound side.

  By the way, the soundboard 1 is originally made to resonate in a wide sound range from high to low. In other words, the soundboard 1 selects a sound range, and a high sound is resonated on the high sound side and a low sound is sounded on the low sound side.

  The same acoustic signal is given to the acoustic devices 10A and 10B from one electronic device (see FIG. 4). The acoustic signal includes high to low sounds.

  An acoustic signal including high to low sounds is input from the acoustic device 10A, but the soundboard 1 selects a high sound on the high sound side and makes a high sound resonate.

  An acoustic signal including a high tone and a low tone is input from the acoustic device 10B, but the soundboard 1 selects a low tone on the low tone side and makes the low tone sound.

  Thereby, the acoustic system can reproduce music in a wide sound range from high to low.

~ Variation of acoustic system ~
The acoustic system is mounted on a single piano and reproduces music in a wide sound range from high to low, but can also be applied to stringed instruments.

  FIG. 11 is a conceptual diagram according to a modification of the acoustic system.

  Examples of stringed instruments include violins, violas, cellos, and contrabass. The violin has a high sound, the viola has a high sound, the cello has a low sound, and the contrabass has a low sound.

  Attach acoustic devices to the violin, viola, cello, and contrabass. Each acoustic device is given the same acoustic signal from one electronic device. The acoustic signal includes high to low sounds.

  An acoustic signal including high to low sounds is input from an acoustic device attached to the violin. The violin selects a high sound and makes a high sound resonate.

  An acoustic signal including high to low sounds is input from an acoustic device attached to the viola, but the viola selects a slightly high sound and resonates a slightly high sound.

  An acoustic signal including high to low sounds is input from an acoustic device attached to the cello, but the cello selects a slightly low sound and makes a low sound.

  An acoustic signal included from high to low sounds is input from an acoustic device attached to the contrabass. The contrabass selects a low tone and makes a low tone sound.

  Thereby, the acoustic system can reproduce music in a wide sound range from high to low.

DESCRIPTION OF SYMBOLS 1 Sound board 2 Sound bar 3 Support | pillar 10 Sound apparatus 11 Support | pillar fixing part 12 Overhang | projection part 13 Exciter 14 Contact assistance part 31 Vibrator 32 Permanent magnet 33 Yoke 34 Voice coil 35 Damper 41 Holding member 42 Energizing member 43 Spacer 44 Clamping screw 45 Crimping screw

Claims (5)

An acoustic device attached to a piano,
A column fixing part fixed to the piano column;
A projecting portion projecting from the support post fixing portion;
A vibration unit that is provided at the tip of the overhang part and vibrates based on an external acoustic signal;
An acoustic device comprising: an abutment assisting unit that abuts the vibrator of the excitation unit against a sounding rod. The acoustic device according to claim 1, wherein the contact assisting unit includes a clamping mechanism that clamps the sounding rod. The acoustic device according to claim 1, wherein the contact assisting unit includes a biasing mechanism that biases the vibrator toward the sounding rod. The acoustic device according to any one of claims 1 to 3, wherein the contact assisting portion includes a rotation mechanism that can rotate about a major axis of the vibrator. A first acoustic device that is in contact with a high-frequency sounder;
A second acoustic device that is in contact with a low-frequency sounder;
A sound source device for applying an acoustic signal to the first acoustic device and the second acoustic device;
With
The acoustic system according to claim 1, wherein the first acoustic device and the second acoustic device are acoustic devices according to claim 1.

Images