Musical instrument

Abstract

The utility model provides a musical instrument, which is provided with a vibration increasing device with improved driving force. A musical instrument (1) according to one embodiment includes: a castanet (7) to which vibration of a sound source is transmitted; a vibration device (50) that vibrates the castanet (7) in response to an input signal; the vibration device (50) is provided with: a vibrator (51) that contacts the castanet (7) and vibrates the castanet (7); a support part (52) which is mounted on the castanet (7) and supports the vibrator (51); the support section (52) has an elastic displacement section (521) that elastically displaces with respect to the castanet (7), and the elastic displacement section (521) has a natural vibration frequency that is equal to or less than a frequency corresponding to the highest peak value among a plurality of peak values of the frequency characteristics of the vibrator (51).

Description

Technical Field

[0001] The utility model relates to a musical instrument. Background Art

[0002] Among musical instruments, there are musical instruments that produce sound by vibrating a soundboard or the like that transmits vibrations of a sound source through an exciter. As such musical instruments, for example, Patent Documents 1 and 2 disclose a guitar equipped with an exciter that is mounted on a piano body and vibrates the piano body. Also, Patent Document 3 discloses a piano equipped with an exciter that vibrates a soundboard.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: (Japanese) Patent Publication No. 2012-150235

[0006] Patent Document 2: (Japanese) Patent Publication No. 2017-129694

[0007] Patent Document 3: (Japanese) Patent Publication No. 2014-142378 Utility Model Content

[0008] Technical problems to be solved by utility models

[0009] When vibrating the castanets of a musical instrument by means of a vibrator, there is a problem that the driving force of the vibrator is insufficient and the castanets cannot be vibrated to a desired magnitude, depending on the type of musical instrument or the size or structure of the castanets of the musical instrument. For example, when the musical instrument is a piano, the driving force caused by a small vibrator cannot vibrate the castanets to a desired magnitude, especially in the bass region. When a large vibrator with a high driving force is used, the vibration of the castanets is hindered due to the weight of the vibrator itself, and the sound of the musical instrument changes.

[0010] One of the purposes of the utility model is to provide a musical instrument equipped with a vibration device for increasing driving force.

[0011] Technical solutions for solving technical problems

[0012] According to one embodiment, a musical instrument is provided, which includes: a soundboard to which vibrations of a sound source are transmitted; a vibration device that vibrates the soundboard in response to an input signal; the vibration device has: a vibrator that contacts the soundboard and vibrates the soundboard; a supporting portion that is mounted on the soundboard and supports the vibrator; the supporting portion has an elastic displacement portion that elastically changes relative to the soundboard, the elastic displacement portion having a natural vibration frequency below a frequency corresponding to a highest peak among multiple peaks of a frequency characteristic of the vibrator.

[0013] Utility Model Effect

[0014] According to the utility model, a musical instrument can be provided, which is equipped with a vibration device with enhanced driving force. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a diagram showing the internal structure of the musical instrument according to the present embodiment.

[0016] Figure 2 This is a diagram showing an example of the appearance of the vibration exciter according to the present embodiment.

[0017] Figure 3 It is shown along Figure 2 A schematic cross-sectional view of the cross section of the oscillator taken along line A1-A2.

[0018] Figure 4 This is a diagram showing an example of the installation position of the vibrating device in the musical instrument.

[0019] Figure 5 Graph showing the magnitude of vibration of the vibration exciter device according to the present embodiment and the magnitude of vibration of only the vibrator.

[0020] Figure 6 Graphs showing the volume of a piano when the vibration exciter device of the present embodiment is attached to the sound board and the volume of a piano when only the vibration exciter is attached to the sound board.

[0021] Figure 7 Graphs showing the volume of a piano when the vibration exciter device of the present embodiment is attached to the sound board and the volume of a piano when only the vibration exciter is attached to the sound board.

[0022] Reference numerals

[0023] 1…piano, 2…key, 3…pedal, 4…hammer, 5…string, 6…bridge, 7…casting board, 8…damper, 9…frame, 10…control device, 22…key sensor, 23…pedal sensor, 24…hammer sensor, 30…key driving device, 33…pedal driving device, 38…damper driving device, 40…stopper, 45…action mechanism, 50…vibration device, 51…vibrator, 52…supporting portion, 53…terminal portion, 511…connecting portion, 513…displacement portion, 514…cover, 515…elastic portion, 517…frame, 521…elastic displacement portion, 523…fixing portion, 525…vibrator mounting portion, 527…vibrator supporting portion, 529…bending portion DETAILED DESCRIPTION

[0024] Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. The embodiment shown below is an example, and the present invention is not limited to these embodiments for interpretation. In the drawings referred to in the present embodiment, the same parts or parts having the same functions are marked with the same reference numerals or similar reference numerals (only reference numerals such as A, B are attached after the numbers), and their repeated descriptions are sometimes omitted. In order to make the description clear, the dimensional ratio of the drawings is sometimes different from the actual ratio, or a part of the structure is omitted from the drawings and schematically described.

[0025] A musical instrument of one embodiment is capable of mounting a vibrator having a predetermined weight on an acoustic component. In a musical instrument of one embodiment, a vibration device having a support portion for supporting the vibrator is mounted on a soundboard of the musical instrument. The support portion supports the vibrator in such a manner that a part of the vibrator contacts the soundboard. The support portion has an elastic displacement portion that elastically displaces relative to the soundboard. The driving force of the vibration device is increased by the vibration of the support portion caused by the displacement of the elastic displacement portion.

[0026] Hereinafter, a musical instrument according to an embodiment will be described with reference to the accompanying drawings. In the embodiment described below, as an example, a case where the musical instrument is a keyboard instrument will be described. In addition, the musical instrument of the present invention is not limited to a keyboard instrument.

[0027] [Structure of musical instruments]

[0028] Figure 1 1 is a diagram showing the internal structure of a keyboard instrument 1 according to the present embodiment. In the present embodiment, the keyboard instrument 1 is a piano. Hereinafter, the keyboard instrument 1 is referred to as a piano 1. In addition, in the present embodiment, the piano 1 is an upright piano. The piano 1 is an example of a keyboard instrument, and the keyboard instrument has a keyboard on which a plurality of keys (performance operating elements) 2 are arranged for performance operation by a performer, and a pedal 3. The piano 1 has a plurality of pedals, and the pedal 3 represents a damper pedal. Figure 1 In the figure, the structures provided corresponding to the keys 2 are shown with attention paid to the structures provided corresponding to one key 2 (a white key in this example), and the structures provided corresponding to the other keys 2 are omitted.

[0029] The piano 1 has a control device 10. The control device 10 has any one of an operation panel (not shown), a display unit (not shown), a touch panel (not shown), etc. The user's instructions are input to the control device 10 by operating the operation panel or the touch panel. The control device 10 controls the operation of each structure of the piano 1 based on the user's instructions.

[0030] A key driving device 30 for driving the key 2 using a solenoid may be provided at the lower portion of the rear end side of each key 2 (the back side of the key 2 as viewed from the playing user). The key driving device 30 drives the solenoid according to a key control signal from the control device 10.

[0031] The hammer 4 is provided corresponding to each key 2. When the key 2 is pressed, the hammer 4 is moved by force transmitted via the action mechanism 45, and strikes the string 5 provided corresponding to each key 2. The string 5 is a sound-generating body that generates sound by the strike from the hammer 4. The string 5 has a vibration frequency corresponding to each key 2.

[0032] The damper 8 is moved by the damper actuating mechanism 80. The contact state between the damper 8 and the string 5 is controlled by the damper actuating mechanism 80 according to the amount of depression of the key 2 and the amount of depression of the pedal 3. The control of the contact state means moving the damper 8 within a range from a position where the damper 8 contacts the string 5 to suppress the vibration of the string 5 (hereinafter referred to as a vibration damping position) to a position where the string 5 is released from the damper 8 (hereinafter referred to as a release position).

[0033] In the present embodiment, a damper driving device 38 for driving the damper actuating mechanism 80 may be provided. The damper driving device 38 can drive a solenoid in response to a damper control signal from the control device 10.

[0034] In addition, in the present embodiment, a pedal driving device 33 for driving the pedal 3 may be provided. The pedal driving device 33 can drive the solenoid in response to a pedal control signal from the control device 10 to mechanically reproduce the state in which the pedal 3 is stepped on by the player.

[0035] The stopper 40 is a member that collides with the hammer handle when a sound source is used to generate sound so as to prevent the hammer 4 from striking the string 5 before striking the string. In response to a stopper control signal from the control device 10, the stopper 40 moves to any one of a position colliding with the hammer handle (hereinafter referred to as a blocking position) and a position not colliding with the hammer handle (hereinafter referred to as a dodge position).

[0036] The key sensor 22 is provided at the bottom of each key 2. The key sensor 22 outputs a detection signal corresponding to the behavior of the key 2 to the control device 10. In this example, the key sensor 22 detects the amount of depression of the key 2 as a continuous amount (with fine resolution), and outputs a detection signal indicating the detection result to the control device 10. It should be noted that the key sensor 22 may output a detection signal indicating that the key 2 has passed a specific depression position instead of outputting a detection signal corresponding to the amount of depression of the key 2. The specific depression position refers to any position in the range from the rest position to the end position of the key 2, preferably a plurality of positions that impart a change to the sound state, such as the start of sound generation and the start of movement of the damper 8. In this way, the detection signal output by the key sensor 22 may be any signal as long as it enables the control device 10 to recognize the behavior of the key 2.

[0037] The hammer sensor 24 is provided corresponding to each hammer 4. The hammer sensor 24 outputs a detection signal corresponding to the behavior of the hammer 4 to the control device 10. In this example, the hammer sensor 24 detects the moving speed of the hammer 4 just before it strikes the string 5, and outputs a detection signal indicating the detection result to the control device 10. It should be noted that the detection signal may not indicate the moving speed of the hammer 4 itself, and may also be a detection signal detected by other means, and the moving speed may be calculated in the control device 10. For example, with respect to two positions where the hammer handle passes during the movement of the hammer 4, a detection signal indicating that the hammer handle passes may be output, or a detection signal indicating the time from passing one position to passing another position may be output. In this way, the detection signal output by the hammer sensor 24 may be any signal as long as it enables the control device 10 to recognize the behavior of the hammer 4.

[0038] The pedal sensor 23 is provided corresponding to each pedal 3. The pedal sensor 23 outputs a detection signal corresponding to the behavior of the pedal 3 to the control device 10. In this example, the amount of depression of the pedal 3 is detected, and a detection signal indicating the detection result is output to the control device 10. It should be noted that, instead of outputting a detection signal corresponding to the amount of depression of the pedal 3, the pedal sensor 23 can output a detection signal indicating that the pedal 3 has passed a specific depression position. The specific depression position refers to any position in the range from the rest position to the end position of the pedal, and it is desired to be a depression position that can distinguish between a state in which the damper 8 and the strings 5 ​​are in full contact (damping position) and a state in which they are not in contact (release position). In this way, the detection signal output by the pedal sensor 23 can be any signal as long as it is a signal that enables the control device 10 to recognize the behavior of the pedal 3.

[0039] It should be noted that, through the detection signals output from the key sensor 22, the pedal sensor 23, and the hammer sensor 24, the control device 10 can determine the striking timing (key-on timing) and striking speed (velocity) of the hammer 4 relative to the string 5, and the vibration suppression timing (key-off timing) of the damper 8 relative to the string 5 corresponding to each key 2 (key frequency). Therefore, the key sensor 22, the pedal sensor 23, and the hammer sensor 24 can output the result of detecting the behavior of the key 2, the pedal 3, and the hammer 4 as a detection signal different from the above-mentioned method. In addition, at least one of the key sensor 22, the pedal sensor 23, and the hammer sensor 24 can be omitted from the structure of the piano 1.

[0040] The soundboard 7 is connected to the sound bar 75 and the bridge 6, and the vibration of the soundboard 7 is transmitted to each string 5 via the bridge 6, and the vibration of each string 5 is transmitted to the soundboard 7 via the bridge 6. That is, the soundboard 7 and the strings 5 ​​vibrate in coupling. Here, the side connected to the bridge 6 is set as the surface 7a of the soundboard 7, and the opposite side is set as the back side 7b. On the surface 7a of the soundboard 7, a vibration device 50 is installed. The vibration device 50 is installed on the soundboard 7 in a manner that a part of the vibration device is directly connected to the surface 7a of the soundboard 7. The structure of the vibration device 50 is described in detail below.

[0041] [Structure of the vibration device]

[0042] Figure 2 FIG. 2 is a diagram showing an example of the appearance of the vibration excitation device 50 according to the present embodiment. Figure 2 , the vibration device 50 is shown as viewed from the surface 7a side of the soundboard 7. Figure 2 , a side of the vibration device 50 facing the surface 7a of the sound board 7 is shown. Figure 3 It is shown along Figure 2 A schematic cross-sectional view of the cross section of the vibration device 50 along the line A1-A2 in FIG. Figure 3 in, omit Figure 2 A portion of cover 514 is shown.

[0043] The vibration device 50 includes a vibrator 51 and a support portion 52 (support). The vibration device 50 may further include a terminal portion 53. The vibrator 51 contacts the soundboard 7 to vibrate the soundboard 7. The support portion 52 supports the vibrator 51 in such a manner that a part of the vibrator 51 contacts the surface 7a of the soundboard 7. In addition, the support portion 52 is attached to the soundboard 7 to fix the vibrator 51.

[0044] like Figure 2 as well as Figure 3As shown, the vibrator 51 has a connecting portion 511, a displacement portion 513 and a frame 517. The vibrator 51 is connected to an output device not shown in the figure. The output device outputs a driving input signal generated based on pre-stored music data, sound / voice data or at least one of the detection signals output from the key sensor 22, the pedal sensor 23 and the hammer sensor 24 to the vibrator 51. The output device can also be connected to the terminal portion 53 via a wiring not shown in the figure. In this case, the vibrator 51 can receive the input signal output from the output device via the terminal portion 53. The terminal portion 53 supplies the driving signal output from the output device to the vibrator 51 via the wiring 531 that electrically connects the terminal portion 53 and the vibrator 51. It should be noted that the vibrator 51 can also be connected to the output device wirelessly. The vibrator 51 vibrates the soundboard 7 in response to the input signal.

[0045] Specifically, the displacement portion 513 is displaced relative to the sound board 7 based on the input signal. In other words, the displacement portion 513 vibrates in response to the input signal, and causes the sound board 7 to vibrate via the connection portion 511.

[0046] like Figure 3 As shown, in the vibrator 51, the elastic part 515 is provided between the displacement part 513 and the connection part 511. The elastic part 515 guides the vibration of the connection part 511. The elastic part 515 has flexibility. The elastic part 515 can be made of a resin material, a metal material, or the like.

[0047] like Figure 2 As shown, a cover 514 made of resin or the like is installed on the side of the vibrator 51 facing the soundboard 7. The cover 514 includes a connection portion 511 that contacts the soundboard 7. The connection portion 511 contacts the soundboard 7 and vibrates the soundboard 7. The cover 514 including the connection portion 511 is formed of a light material such as a resin such as polyimide or a metal such as an aluminum material. Figure 3 , the structure of the cover 514 except the connection portion 511 is omitted and shown.

[0048] The vibrator 51 may be, for example, a voice coil type actuator. In this case, the displacement portion 513 has a magnetic body portion, and the connection portion 511 moves integrally with the voice coil. The weight of the displacement portion 513 is greater than the weight of the connection portion 511. Thus, the connection portion 511 can be vibrated by the vibration of the displacement portion 513.

[0049] The frame 517 is in contact with the displacement portion 513. In addition, the frame 517 can accommodate a portion of the displacement portion 513. The frame 517 and the displacement portion 513 are bonded by an adhesive, a double-sided tape (not shown), or the like. In addition, instead of directly bonding the connection portion 511 and the frame 517, the two may be connected via a transfer component for easy loading and unloading. The frame 517 is fixed to the support portion 52 by screws. However, the method of fixing the frame 517 to the support portion 52 is not limited to screws. The frame 517 is made of a resin such as polyimide.

[0050] The support part 52 fixes the vibrator 51 in such a manner that the connection part 511 of the vibrator 51 contacts the soundboard 7. The support part 52 is a bracket having an integral structure having a plate-like part having a length in a predetermined first direction D1. The support part 52 is made of metal such as iron or stainless steel, resin, or the like. The support part 52 is connected to the displacement part 513 of the vibrator 51 via a frame 517. The support part 52 has an elastic displacement part 521, a fixing part 523, and a vibrator mounting part 525.

[0051] Reference Figure 2 , as for the exciter mounting portion 525, a support portion 52 is provided, and the exciter mounting portion 525 is centrally mounted with the exciter 51. The end portion of the exciter mounting portion 525 in the first direction D1 is connected to the elastic displacement portion 521. The elastic displacement portion 521 is a plate-shaped portion having a length in the first direction D1. One end 521a (first end) of the elastic displacement portion 521 is connected to the fixing portion 523. In other words, the fixing portion 523 is connected to one end 521a (first end) of the elastic displacement portion 521, and the exciter mounting portion 525 is connected to the other end 521b (second end).

[0052] The elastic displacement part 521 has flexibility and vibrates by the vibration of the displacement part 513. In other words, the elastic displacement part 521 is elastically displaced relative to the soundboard 7. The elastic displacement part 521 has a natural vibration frequency below the frequency corresponding to the highest peak among the multiple peaks of the frequency characteristics of the vibrator 51. Here, the highest peak among the multiple peaks is the highest peak on the low frequency band side. "Low frequency band side" specifically refers to the frequency band below 1000 Hz (1 kHz). That is, the elastic displacement part 521 has a natural vibration frequency below the frequency corresponding to the highest peak below 1000 Hz among the multiple peaks of the frequency characteristics of the vibrator 51. Specifically, the elastic displacement part 521 has a natural vibration frequency in the frequency band between 100 Hz and 200 Hz. The natural vibration frequency of the elastic displacement part 521 can be adjusted by adjusting the length, width, thickness, etc. of the elastic displacement part 521. Here, the length of the elastic displacement part 521 is the length in the first direction D1. The width of the elastic displacement part 521 is the width in the second direction D2 perpendicular to the first direction D1. The thickness of the elastic displacement portion 521 is a thickness in a third direction D3 perpendicular to the first direction D1 and the second direction D2 .

[0053] The fixing portion 523 is mounted on the soundboard 7 to fix the supporting portion 52 as a whole to the soundboard 7. The fixing portion 523 is mounted on the soundboard 7 by screw fixation. However, the method of mounting the fixing portion 523 on the soundboard 7 is not limited to screw fixation, and the fixing portion 523 may be bonded by an adhesive, a double-sided tape (not shown), or the like. In addition, instead of directly bonding the fixing portion 523 to the soundboard 7, the two may be connected via a transfer component for easy and detachable fixing. The fixing portion 523 is connected to one end 521a of the elastic displacement portion 521. As shown in FIG. Figure 2 As shown, the fixing portion 523 may include: a bent portion bent from one end 521 a of the elastic displacement portion 521 along the third direction D3; and a planar portion connected to the bent portion and extending along the first direction D1.

[0054] The vibrator 51 is mounted on the vibrator mounting portion 525. The vibrator mounting portion 525 has an opening 526 for exposing the connection portion 511 of the vibrator 51 to the soundboard 7. In order to ensure a space for providing a wiring 531 that electrically connects the terminal portion 53 to the vibrator 51, the side of the opening 526 where the terminal portion 53 is provided may be opened.

[0055] The vibrator mounting portion 525 has a vibrator support portion 527 at the end of the second direction D2. The vibrator support portion 527 has a higher rigidity than the elastic displacement portion 521 relative to the displacement direction of the elastic displacement portion 521, that is, the third direction D3. The thickness of the vibrator support portion 527, for example, in the third direction D3 can be greater than that of the elastic displacement portion 521. Figure 2As shown, a bent portion 529 bent along the third direction D3 may be provided at the end of the vibrator support portion 527 in the second direction D2. The bent portion 529 increases the rigidity of the vibrator support portion 527. Since the vibrator support portion 527 has a higher rigidity than the elastic displacement portion 521 in the third direction D3, when the vibrator 51 is mounted on the vibrator mounting portion 525, the vibrator 51 is stably held.

[0056] Figure 4 1 is a diagram showing an example of the installation position of the vibration device 50 in the piano 1. Figure 4 As shown, on the surface 7a of the soundboard 7, a frame 9 is arranged and strings (not shown) are laid. In addition, a bridge (not shown) is connected to the surface 7a. A plurality of sound bars 75 are arranged at predetermined intervals on the back side 7b opposite to the surface 7a. The vibration device 50 is attached to the surface 7a of the soundboard 7 in such a manner that the connection portion 511 of the vibration exciter 51 contacts the surface 7a of the soundboard 7. Figure 4 As shown, the vibration device 50 may be installed in such a manner that the connection portion 511 of the vibrator 51 contacts the area between the adjacent sound bars 75 located on the surface 7a of the sound board 7. In this case, the fixing portion 523 in the support portion 52 of the vibration device 50 may overlap with the sound bar 75 provided on the back surface 7b of the sound board 7 and be fixed to the sound bar 7.

[0057] In this embodiment, the piano 1 includes a bass-range side ( Figure 4 The vibrating device 50L is installed on the left side of the soundboard 7 shown in the figure, and the vibrating device 50L is installed on the high-range side ( Figure 4 Considering the convenience of installation on the soundboard 7, it is preferred that the vibration devices 50 (50L, 50R) are installed on the soundboard 7 so that the soundboard 7 and the frame 9 do not overlap and no strings are laid (on the right side of the soundboard 7). Figure 4 It should be noted that the position where the vibration device 50 (50L, 50R) in the soundboard 7 is installed is not limited to Figure 4 The positions shown can be appropriately set according to the structure of the frame 9, the position of the strings, and the like.

[0058] Figure 5 Graph showing the magnitude of vibration of the vibration device 50 of the present embodiment and the magnitude of vibration of the vibrator 51 in the range of greater than 70 Hz to less than 2000 Hz (2 kHz). Hereinafter, the vibrator 51 in which the support portion 52 is omitted is referred to as a comparative vibrator. Figure 5In the graph shown, the horizontal axis represents frequency (Hz), the vertical axis represents vibration level (dB), the solid line represents the frequency characteristics of the vibration device 50, and the dotted line represents the frequency characteristics of the comparative vibration device. Here, as the vibration device in the vibration device 50 and the comparative vibration device, a driver with a mass of about 109.5g, a rated input of 15W (maximum input 30W), a rated impedance of 4Ω, an impedance of about 4.4Ω at 700Hz, a minimum resonance frequency (f0) of about 215Hz at 1V, and a magnetic flux density of about 1.20T is used. As the vibration device 50, the above-mentioned vibration device and a support portion (bracket) on which the vibration device is mounted are used. The support portion (bracket) has the same Figure 2 The support portion 52 shown has the same shape, and the resonance frequency of the first-order mode of the elastic displacement portion is 119.45 Hz. In other words, the elastic displacement portion of the support portion (bracket) has a natural vibration frequency below the frequency corresponding to the highest peak (f0) of the frequency characteristic of the exciter (about 215 Hz).

[0059] like Figure 5 As shown in FIG. 1 , in the range of 100 Hz to 200 Hz, the magnitude of the vibration of the vibration device 50 indicated by the solid line is greater than the magnitude of the vibration of the comparative vibration device indicated by the dotted line. In other words, in the range of 100 Hz to 200 Hz, particularly in the range of about 100 Hz to about 160 Hz, the driving force generated by the vibration device 50 exceeds the driving force generated by the comparative vibration device. Thus, it can be seen that the vibration of the support portion (bracket) mounted on the vibration device contributes to the improvement of the driving force of the vibration device 50 as a whole.

[0060] Figure 6 as well as Figure 7 The graph shows the frequency dependence of the volume of the piano when the vibration device 50 of the present embodiment is mounted on the soundboard and driven, and when the comparative vibration device is mounted on the soundboard and driven. An upright piano was used as the piano, and the sound pressure of the piano was measured using a microphone at the position of the pianist, that is, approximately in front of the piano. The characteristics of the vibration device 50 used here and the comparative vibration device are similar to those in Figure 5 The vibration device 50 used in the measurement of the vibration of the soundboard shown in FIG. 1 and the vibration exciter used for comparison have the same characteristics. Figure 4 As shown, the vibration exciter device 50 or the comparative vibration exciter is set at two locations in the soundboard of the piano.

[0061] Figure 6 It is shown in Figure 4 The graph of the frequency dependence of the volume of a piano with a vibration exciter 50L or a comparative vibration exciter installed on the bass side of the piano is shown. Figure 6In the graph shown, the horizontal axis represents frequency (Hz), the vertical axis represents vibration level (dB), the solid line represents the volume of the piano when the vibration exciter 50 is installed on the sound board, and the dotted line represents the volume of the piano when the comparison exciter is installed on the sound board. Figure 7 Graph showing the frequency dependence of the volume of a piano in which the vibration exciter device 50R or a comparative vibration exciter is installed on the high-range side of the piano. Figure 7 In the graph shown, the horizontal axis represents frequency (Hz), the vertical axis represents vibration level (dB), the solid line represents the volume of the piano when the vibration exciter 50 is installed on the sound board, and the dotted line represents the volume of the piano when the comparison exciter is installed on the sound board.

[0062] like Figure 6 as well as Figure 7 As shown, in both the low-range side and the high-range side of the piano, in the range of 100 Hz to 200 Hz, the volume of the piano when the vibration device 50 (50L, 50R) is installed on the soundboard as shown by the solid line is greater than the volume of the piano when the comparative vibration device is installed on the soundboard as shown by the dotted line. Therefore, it can be seen that when the vibration device 50 is installed on the soundboard, the acoustic characteristics of the piano are improved. In addition, as shown in FIG. Figure 6 as well as Figure 7 As shown, by installing the vibration exciter 50 on the soundboard, the acoustic characteristics of the piano, in particular, on the low range side, can be improved.

[0063] As described above, in the vibration device 50, by providing the elastic displacement portion 521 that elastically displaces relative to the soundboard on the support portion 52 (bracket) that supports the vibrator 51, the driving force of the entire vibration device 50 can be improved. By attaching such a vibration device 50 to the soundboard 7 of the piano 1, the acoustic characteristics of the piano 1, especially the acoustic characteristics on the bass side, can be improved.

[0064] [Modifications]

[0065] As mentioned above, although one embodiment of the present invention has been described, the present invention can be implemented in various forms as follows.

[0066] (1) In the above embodiments, the present invention is described as a keyboard musical instrument. Here, the keyboard musical instrument is not limited to an upright piano, and may be, for example, a grand piano, a harpsichord, etc. In addition, the present invention is not limited to a keyboard musical instrument, and may be a sound-generating device that does not include operating elements such as keys.

[0067] (2) In the above embodiment, if Figure 4As shown, an example in which two vibration devices 50 are installed on the sound board 7 is described. However, the number of vibration devices 50 installed on the sound board 7 is not limited to two, and one or more vibration devices 50 may be installed.

[0068] (3) The same input signal may be input to the plurality of vibration excitation devices 50, or different input signals may be input to the plurality of vibration excitation devices 50. For example, when two vibration excitation devices 50 are used, the corresponding input signals may be an input signal for the vibration excitation device 50 (50L) provided on the low-frequency side and an input signal for the vibration excitation device 50 (50R) provided on the high-frequency side.

[0069] (4) In addition, the frequency characteristics of the plurality of vibration excitation devices 50 may be different. For example, the resonance frequency of the elastic displacement portion 521 of the vibration excitation device 50 (50R) provided on the high-frequency side may be higher than the resonance frequency of the elastic displacement portion 521 of the vibration excitation device 50 (50L) provided on the low-frequency side.

Claims

1. A musical instrument, characterized in that include: castanets, to which the vibrations of the sound-generating source are transmitted; a vibration device for vibrating the soundboard in response to an input signal; The vibration device comprises: a vibrator, which contacts the castanets and vibrates the castanets; A supporting part, which is mounted on the soundboard and supports the vibrator; The support portion has an elastic displacement portion that is elastically displaced relative to the castanets, The elastic displacement portion has a natural vibration frequency that is not more than a frequency corresponding to a highest peak among a plurality of peaks of the frequency characteristic of the exciter.

2. The musical instrument according to claim 1, characterized in that The input signal is generated based on a signal representing vibration of the sound source.

3. The musical instrument according to claim 1, characterized in that The support portion further comprises: A fixing portion connected to the first end of the elastic displacement portion and mounted on the soundboard; a vibration exciter mounting portion connected to a second end of the elastic displacement portion located on the opposite side of the first end and for mounting the vibration exciter; The exciter mounting portion has an exciter supporting portion at an end portion in a second direction perpendicular to a first direction from the first end along the second end. The exciter support portion has a higher rigidity than the elastic displacement portion in a direction in which the elastic displacement portion displaces.

4. The musical instrument according to claim 3, characterized in that The exciter support portion includes a bent portion that is bent in a third direction that is orthogonal to the first direction and the second direction.

5. The musical instrument according to any one of claims 1 to 4, characterized in that It also includes multiple keys. The sound generation source generates a sound based on an operation of each of the plurality of keys.

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