Vibration exciters and vibration systems

Abstract

To enable a volume of sound produced by a stringed instrument to be improved by vibration of a vibrating device and to enable an acoustic property close to that of the stringed instrument when a player performs the stringed instrument to be obtained.SOLUTION: Provided is a vibrating device 2 including: a vibrator 21 having a main body 23 and a vibrating body 24 that vibrates in a predetermined vibrating direction with respect to the main body 23; and a vibration transmission part 22 provided so as to extend from the vibrating body 24 and brought into contact with strings 101 of a stringed instrument to transmit vibration of the vibrating body 24 to the strings 101. The vibration transmission part 22 has a sandwiching part 25 that sandwiches the strings 101. When the sandwiching part 25 sandwiches the strings 101, the vibration transmission part 22 is held in a state in contact with the strings 101.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a vibration device and a vibration system.

Background Art

[0002] Patent Document 1 discloses a vibration device for a stringed instrument (equipped with a vibrator) that is supported by a string of the stringed instrument and causes sound to be produced by directly vibrating a bridge. Patent Document 2 discloses a vibration device for a stringed instrument that is supported by a string of the stringed instrument and causes sound to be produced by directly vibrating a saddle.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, the saddle and bridge of a stringed instrument are harder in material compared to the strings and body of the stringed instrument. Also, the saddle and bridge have a structure in which a part of them is fixed to the body and supports the strings. Therefore, even if the saddle or bridge is directly vibrated by a vibration device as in Patent Documents 1 and 2, the saddle and bridge are difficult to vibrate, and the vibration (amplitude) of the body and strings of the stringed instrument becomes smaller compared to the vibration (amplitude) of the vibration device. As a result, there is a problem that the volume of sound produced by the stringed instrument in response to the vibration by the vibration device is insufficient. Also, in the saddle and bridge, vibrations in a low frequency band caused by a vibration device are particularly likely to be attenuated. Therefore, there is a problem that the acoustic characteristics of the stringed instrument when the strings are vibrated by the vibration device are significantly different from the acoustic characteristics of the stringed instrument when a player plays the stringed instrument.

[0005] The present invention has been made in view of the above circumstances, and aims to provide a vibration device and vibration system that can improve volume and approximate the acoustic characteristics of a stringed instrument when a performer plays it. [Means for solving the problem]

[0006] A first aspect of the present invention comprises a vibrator having a main body and a vibrating body that vibrates in a predetermined vibration direction relative to the main body in response to an excitation signal, and a vibration transmission unit extending from the vibrating body and contacting the strings of a stringed instrument to transmit the vibration of the vibrating body to the strings, wherein the vibration transmission unit includes a clamping portion that holds the strings, and the clamping portion holds the strings, thereby maintaining the vibration transmission unit in contact with the strings. The vibration device is attached to the stringed instrument solely via the string, by the clamping portion clamping the string.

[0007] A second aspect of the present invention is a vibration system comprising the vibration excitation device and a body vibration excitation device for directly exciting the body of the stringed instrument. [Effects of the Invention]

[0008] According to the present invention, by directly vibrating the strings of a stringed instrument as the driven element using a vibration device, it is possible to improve the volume of sound produced by the stringed instrument and to approximate the acoustic characteristics of the stringed instrument when a performer plays it. [Brief explanation of the drawing]

[0009] [Figure 1] This is a front view showing a double bass to which a vibration excitation system according to one embodiment of the present invention is applied. [Figure 2] This is a side view showing a double bass to which a vibration system according to one embodiment of the present invention is applied. [Figure 3] Figures 1 and 2 show the vibration excitation device as viewed from the axial direction of the string. [Figure 4] This is a rear view of a double bass showing the body vibration device pressed against the outer surface of the body using the first example of the pressing device. [Figure 5]This is a side view of a double bass showing the body vibration device pressed against the outer surface of the body using the first example of the pressing device. [Figure 6] This is a rear view of a double bass showing the body vibration device pressed against the outer surface of the body using the second example of the pressing device. [Figure 7] This is a side view of a double bass showing the body vibration device pressed against the outer surface of the body using the second example of the pressing device. [Figure 8] This is a rear view of a double bass showing the body vibration device pressed against the outer surface of the body using the third example of the pressing device. [Figure 9] This is a side view of a double bass showing the body vibration device pressed against the outer surface of the body using the third example of the pressing device. [Modes for carrying out the invention]

[0010] An embodiment of the present invention will be described below with reference to Figures 1 to 3. As shown in Figures 1 and 2, the vibration exciter 2 and vibration exciter system 1 according to this embodiment are applied to a stringed instrument having a string 101, a body 102 having a hollow interior, and a bridge 103 that transmits the vibration of the string 101 to the body 102. Below, an example of applying the vibration exciter 2 and vibration exciter system 1 to a double bass 100, which is a type of stringed instrument, will be described. However, the vibration exciter 2 and vibration exciter system 1 may be applied to other stringed instruments such as violins, cellos, acoustic guitars, and ukuleles.

[0011] The vibration system 1 of this embodiment comprises a vibration device 2 and a body vibration device 3. As shown in Figures 1 and 3, the vibration exciter 2 is a device that directly excites the strings 101 of the double bass 100, and comprises a vibrator 21 and a vibration transmission unit 22. The vibrator 21 has a main body 23 and a vibrating body 24 that vibrates relative to the main body 23 in a predetermined vibration direction (left-right direction in Figures 1 and 3). The vibrator 21 is connected to an output device (not shown). Specifically, the input terminal of the vibrator 21 may be connected to the output device by wire, or a wireless unit such as WiFi® or Bluetooth® provided on the vibrator 21 may be connected to the output device wirelessly to receive signals from the output device. The output device stores musical data and sound / voice data, and outputs an excitation signal (electrical signal) based on that data. When the output device outputs an excitation signal and the vibrator 21 receives the excitation signal, the vibrating body 24 vibrates relative to the main body 23 based on the excitation signal. The vibrator 21 may be, for example, a voice coil type actuator. In this case, the main body 23 may have a magnetic part, and the vibrating body 24 may have a voice coil. The vibration transmission part 22 is provided so as to extend from the vibrating body 24. In Figure 3, the vibration transmission part 22 extends from the vibrating body 24 in the direction of vibration of the vibrating body 24, but it may also extend in a direction inclined with respect to the direction of vibration, for example. The weight of the main body 23 of the vibrator 21 is sufficiently heavy compared to the combined weight of the vibrating body 24 and the vibration transmission section 22 provided thereon. This allows the vibrating body 24 and the vibration transmission section 22 to vibrate relative to the main body 23.

[0012] The vibration transmission unit 22 transmits the vibration of the vibrating body 24 to the string 101 (driven body) of the double bass 100 by contacting the string 101. The vibration transmission unit 22 includes a clamping part 25 that holds the string 101 of the double bass 100. The clamping portion 25 includes two plate portions 26 and 27 disposed on both sides of the string 101, and a force applying portion 28 that applies a force in a direction to bring the two plate portions 26 and 27 closer to each other. The two plate portions 26 and 27 are each formed in a flat strip shape and are arranged in the plate thickness direction (the vertical direction in FIG. 3). The longitudinal directions of the two plate portions 26 and 27 are arranged along the vibration direction of the vibrating body 24. In the present embodiment, the first plate portion 26 of the two plate portions 26 and 27 is fixed to the vibrating body 24. The second plate portion 27 of the two plate portions 26 and 27 is attached to the first plate portion 26. In FIG. 3, the length of the second plate portion 27 in the longitudinal direction is shorter than the length of the first plate portion 26, but it is not limited to this.

[0013] The force applying portion 28 in the present embodiment is a screw 28A. The screw 28A is attached to the two plate portions 26 and 27 to connect the two plate portions 26 and 27. By rotating the screw 28A, the two plate portions 26 and 27 can be moved closer to or away from each other. With the string 101 disposed between the two plate portions 26 and 27, by rotating the screw 28A to bring the two plate portions 26 and 27 closer to each other, the string 101 can be clamped between the two plate portions 26 and 27. In the present embodiment, by clamping two strings 101 between the two plate portions 26 and 27, a structure is formed in which the two strings 101 support the vibration device 2. That is, in a state where the vibration device 2 is attached to the double bass 100, since the vibration device 2 does not touch the double bass 100 other than the string 101, the vibration device 2 does not interfere with the vibration of the double bass 100 or change the vibration characteristics of the double bass 100.

[0014] In the present embodiment, the screw 28A is attached to the middle portions of the two plate portions 26 and 27 in the longitudinal direction. Thereby, the string 101 can be clamped between the two plate portions 26 and 27 in regions on both sides of the screw 28A in the longitudinal direction of the plate portions 26 and 27. Note that the screw 28A may be attached to the ends of the two plate portions 26 and 27 in the longitudinal direction.

[0015] The vibration device 2 of the present embodiment configured as described above is attached to the contrabass 100 so that the two plate portions 26 and 27 (vibration transmission portion 22) contact the string 101. Specifically, by sandwiching the two strings 101 between the two plate portions 26 and 27 using the screws 28A (force application portion 28), the vibration transmission portion 22 is held in a state of contacting the string 101. In FIG. 1, the vibration device 2 is attached to the two lower strings 101L (a part of the driven body) among the four strings 101 of the contrabass 100, but it may be attached to the two upper strings 101H (a part of the driven body), for example. Further, the vibration device 2 may be attached to all four strings 101 (the whole of the driven body), for example.

[0016] In the state where the vibration device 2 is attached to the string 101 of the contrabass 100, the longitudinal directions of the two plate portions 26 and 27 intersect with the axial direction of the string 101 (the vertical direction in FIG. 1). Thereby, since the vibration direction of the vibrating body 24 intersects with the axial direction of the string 101, the vibration device 2 vibrates the string 101 in a direction intersecting with the axial direction of the string 101. In FIG. 1, the longitudinal directions of the two plate portions 26 and 27 (the left - right direction in FIG. 1) are orthogonal to the axial direction of the string 101, but they may be inclined with respect to the axial direction of the string 101, for example.

[0017] In the state where the vibration device 2 is attached to the contrabass 100, it is more preferable that the vibration transmission portion 22 contacts a position on the string 101 that can be an antinode of the vibration of the string 101. The position of the string 101 that can be an antinode of the vibration is not limited to the position where the string 101 vibrates the most, but may be any position on the string 101 that is not a node of the vibration. The position where the string 101 becomes a node of the vibration is, for example, the position where the string 101 is supported by the bridge 103 or the nut 141 of the fingerboard 104. Therefore, a position shifted in the axial direction of the string 101 from the position where the string 101 is supported by the bridge 103 or the nut 141 becomes a position where the string 101 can be an antinode of the vibration. From this, the position of the string 101 that can be an antinode of the vibration of the string 101 may be a position adjacent to the bridge 103 of the contrabass 100 as illustrated in FIG. 1. Further, the position of the string 101 that can be an antinode of the vibration of the string 101 may be a position adjacent to the nut 141, for example.

[0018] In Figure 1, the vibration transmission part 22 of the vibration excitation device 2 is in contact with the part of the string 101 between the bridge 103 and the fingerboard 104 (mainly the part that is bowed or plucked with the fingers), but it is not limited to this. The vibration transmission part 22 may also be in contact with the part of the string 101 between the bridge 103 and the tailpiece 105, or with the part of the string 101 between the nut 141 and the peg 161 provided on the head 106.

[0019] As described above, the vibration exciter 2 attached to the double bass 100 directly excites the strings 101 of the double bass 100. The vibration of the strings 101, excited by the vibration exciter 2, is transmitted to the body 102 via the bridge 103, causing the body 102 to vibrate. In addition, the vibration of the strings 101 is transmitted to other parts of the double bass 100, such as the neck 107 and head 106, causing other parts of the double bass 100 to vibrate. In other words, the vibration exciter 2 excites the entire double bass 100 through the vibration of the strings 101. As a result, the double bass 100 produces sound.

[0020] As shown in Figures 1 and 2, the body vibration device 3 directly vibrates the body 102 of the double bass 100. Although not shown, the body vibration device 3 has a body and vibrating element similar to the exciter 21 of the vibration device 2 described above. In the body vibration device 3, the vibrating element vibrates relative to the body when it receives an excitation signal (electrical signal) from an output device (not shown).

[0021] The body vibration device 3 is attached to the body 102 of the double bass 100 so that its vibrating body contacts the outer surface of the body 102. It is more preferable that the body vibration device 3 be attached to a part of the double bass 100 (a part that vibrates easily) in which the body 102 vibrates efficiently in response to the vibration by the body vibration device 3. In Figure 2, the body vibration device 3 is attached to the back plate 121 of the body 102, but it may also be attached to, for example, the top plate 122 of the body 102. Also, in Figure 1, the body vibration device 3 is attached to a position offset to the left from the center of the double bass 100 in the width direction (left-right direction in Figure 1), but it is not limited to this. The body vibration device 3 may also be attached to the center of the double bass 100 in the width direction (see, for example, Figures 4, 6, and 8).

[0022] The body vibration device 3 may be attached to the outer surface of the body 102 using peelable double-sided tape (not shown), as shown in Figures 1 and 2. Alternatively, the body vibration device 3 may be pressed against the outer surface of the body 102 by a pressing tool 4, as shown in Figures 4 to 9. The three pressing tools 4 (4C, 4D, 4E) illustrated in Figures 4 to 9 each have a support portion 41 that supports the body vibration device 3 and is sandwiched between it and the outer surface of the body 102, and a mounting portion 42 for attaching the support portion 41 to the body 102.

[0023] In the first example of the presser device 4C illustrated in Figures 4 and 5, the support portion 41 is formed in the shape of a strip extending along the outer surface of the body portion 102. The body vibration device 3 is supported at the first longitudinal end of the support portion 41. The mounting portion 42 is formed in the shape of a strip extending from the second longitudinal end of the support portion 41 toward the end pin 108, and is fixed to the body portion 102 using the end pin 108. For example, if the end pin 108 is screwed to the body portion 102, the mounting portion 42 is fixed to the body portion 102 by being fastened together with the end pin 108. By fixing the mounting portion 42 to the body portion 102, the support portion 41 is attached to the body portion 102.

[0024] In the second example of the presser device 4D illustrated in Figures 6 and 7, the support portion 41 is formed in a strip shape extending along the outer surface of the body portion 102. The support portion 41 has a support portion 43 in the middle of its longitudinal direction that supports the body vibration device 3. The mounting portions 42 protrude toward the body portion 102 from both ends of the support portion 41 in the longitudinal direction. The support portion 41 is attached to the body portion 102 by sandwiching the body portion 102 between a pair of mounting portions 42 provided at both ends of the support portion 41. The support portion 41 may elastically expand and contract or elastically flex and deform in the longitudinal direction of the support portion 41, for example, so that the distance between the pair of mounting portions 42 changes. In this case, the elastic force of the support portion 41 can be used to sandwich the body portion 102 between the pair of mounting portions 42.

[0025] In the second example, the pressing device 4D may be used alone to press the body vibration device 3 against the outer surface of the body 102, as illustrated in Figures 6 and 7, or multiple pressing devices may be used to press the body vibration device 3 against the outer surface of the body 102. When using multiple pressing devices 4D of the second example, for example, the multiple pressing devices 4D may be attached to the body 102 such that the support portions 43 of the multiple pressing devices 4D overlap each other, and the longitudinal directions of the support portions 41 of the multiple pressing devices 4D intersect each other.

[0026] In the third example of the presser device 4E illustrated in Figures 8 and 9, the support portion 41 has four legs 44 that extend radially in different directions along the outer surface of the body portion 102 from the support portion 43 that supports the body vibration device 3. The mounting portions 42 protrude toward the body portion 102 from the tip of each leg portion 44 in the direction of extension. The support portion 41 is attached to the body portion 102 by sandwiching the body portion 102 between these four mounting portions 42. The support portion 41 may elastically expand and contract or elastically flex and deform in the longitudinal direction of the legs 44, for example, so that the distance between the four mounting portions 42 changes. In this case, the elastic force of the support portion 41 can be used to sandwich the body portion 102 between multiple mounting portions 42. Note that the number of legs 44 constituting the support portion 41 and the number of corresponding mounting portions 42 should be at least three.

[0027] When pressing the body vibration device 3 against the body 102 using any of the pressing tools 4 (4C, 4D, 4E) described in the first to third examples above, a cushioning material such as felt may be placed between the body 102 and the mounting part 42. In this case, damage to the body 102 by the mounting part 42 can be suppressed or prevented.

[0028] As described above, when the body vibration device 3 attached to the body 102 directly vibrates the body 102, the body 102 vibrates. Furthermore, the vibration of the body 102 is transmitted to other parts of the double bass 100, such as the strings 101, neck 107, and head 106, causing those other parts of the double bass 100 to vibrate as well. In other words, the body vibration device 3 vibrates the double bass 100 in the same way as the vibration device 2. As a result, the double bass 100 produces sound.

[0029] In the vibration system 1 of this embodiment, the vibration device 2 and the body vibration device 3 receive a vibration signal corresponding to a predetermined performance sound (such as musical data or sound / voice data), and vibrate the strings 101 and body 102 of the double bass 100. As a result, the double bass 100 emits a performance sound corresponding to the vibration signal.

[0030] The frequency characteristics of the vibration by the body vibration device 3 may be the same as those of the vibration by vibration device 2, or they may be different. For example, in the case of the double bass 100, when the strings 101 are directly vibrated by vibration device 2, low-frequency sounds tend to be produced relatively easily. Also, when the body 102 is directly vibrated by body vibration device 3, mid-range and high-frequency sounds tend to be produced relatively easily. Taking this into consideration, the frequency characteristics of the vibration by vibration device 2 may be set to have a relatively large low-frequency range, while the frequency characteristics of the vibration by body vibration device 3 may be set to have a large mid-range and high-frequency range.

[0031] As described above, the vibration device 2 of this embodiment directly vibrates the string 101, which is more elastically deformable than the bridge 103, and vibrates the stringed instrument such as the double bass 100 via the vibration of the string 101. Therefore, it is possible to suppress the attenuation of the vibration when the vibration of the vibration device 2 is transmitted to the string 101. This makes it possible to vibrate the string 101 efficiently. Consequently, it is possible to improve the volume of sound produced by the stringed instrument in response to the vibration by the vibration device 2. Furthermore, it is possible to bring the acoustic characteristics of the stringed instrument when the string 101 is vibrated by the vibration device 2 closer to the acoustic characteristics of the stringed instrument when a performer plays it.

[0032] Furthermore, since the vibration device 2 of this embodiment directly vibrates the string 101, the vibration device 2 can be applied to various stringed instruments, not just the double bass 100. This point will be explained below. In the method where the vibration device 2 directly vibrates the bridge 103 (or bridge), the bridge 103 must be durable against the vibration by the vibration device 2. Therefore, this method of directly vibrating the bridge 103 can only be applied to stringed instruments where the bridge 103 is relatively large and sturdy. In contrast, in the method where the vibration device 2 directly vibrates the strings 101, as in this embodiment, the bridge 103 is not directly vibrated, so the durability of the bridge 103 is not required. Therefore, this method of directly vibrating the strings 101 can be applied to various stringed instruments regardless of the size or sturdiness of the bridge 103. This method can be applied, for example, to stringed instruments such as violins, where the bridge 103 is small and thin.

[0033] Furthermore, the vibration exciter 2 of this embodiment includes a vibrating body 24 having a main body 23 and a vibrating body 24 that vibrates relative to the main body 23, and a vibration transmission unit 22 that extends from the vibrating body 24 and contacts the string 101 to transmit the vibration of the vibrating body 24 to the string 101. This makes it possible to transmit the vibration of the vibrating body 24 in response to the excitation signal input to the vibrator 21 to the string 101 via the vibration transmission unit 22.

[0034] Furthermore, according to the excitation device 2 of this embodiment, the vibration transmission section 22 contacts a position on the string 101 that can become an antinode of the string 101's vibration. As a result, the string 101 can be vibrated with high efficiency in response to the excitation of the string 101 by the excitation device 2.

[0035] Furthermore, the vibration device 2 of this embodiment vibrates the string 101 in a direction intersecting the axial direction of the string 101. This makes it possible to vibrate the string 101 in a direction intersecting its axial direction. This vibration pattern of the string 101 is similar to the vibration pattern of the string 101 when a performer plays a stringed instrument such as a double bass 100. Therefore, the acoustic characteristics of the stringed instrument when the string 101 is vibrated by the vibration device 2 can be made closer to the acoustic characteristics of the stringed instrument when a performer plays it.

[0036] Furthermore, according to the vibration device 2 of this embodiment, the vibration transmission section 22 includes a clamping section 25 that holds the string 101 (driven body). This allows the vibration device 2 (especially the exciter 21) to be supported by the string 101. When the vibration device 2 is supported by the string 101, it does not hinder the vibration of the body 102 as much as when the vibration device 2 is supported by the body 102. Therefore, the acoustic characteristics of a stringed instrument such as a double bass 100 that produces sound by the vibration of the string 101 by the vibration device 2 can be made closer to the acoustic characteristics of a stringed instrument when a performer plays it. Furthermore, according to the vibration device 2 of this embodiment, since the clamping portion 25 clamps multiple strings 101, the vibration device 2 can be stably supported by the strings 101 compared to the case where the clamping portion 25 clamps only one string 101.

[0037] Furthermore, according to the vibration excitation device 2 of this embodiment, the clamping portion 25 includes two plate portions 26 and 27 arranged on both sides of the string 101 (driven body), and a force applying portion 28 that applies force in a direction that brings the two plate portions 26 and 27 closer together. This ensures that the vibration excitation device 2 is reliably supported by the string 101.

[0038] Furthermore, in the vibration device 2 of this embodiment, the screw 28A, which is the force-applying part 28, is attached to the middle of the two plate parts 26 and 27 in the longitudinal direction. As a result, the chord 101 can be clamped with equal force in the regions on both sides of the screw 28A (force-applying part 28) in the longitudinal direction of the plate parts 26 and 27.

[0039] Furthermore, in the vibration device 2 of this embodiment, the vibration transmission part 22 can be made to contact parts of the string 101 other than the part between the bridge 103 and the fingerboard 104 (mainly the part that is bowed or plucked with the fingers). Therefore, a player of a stringed instrument such as a double bass 100 can play the instrument without being hindered by the vibration device 2 attached to the instrument. In other words, the player can play the stringed instrument while producing sound using the vibration device 2. In addition, the player can easily compare the example performance with their own performance in terms of both sound and vibration by listening to the example performance sound produced by the stringed instrument using the vibration device 2 and feeling the vibration of the stringed instrument accompanying the example performance sound. As a result, the player can efficiently understand and learn how to play a stringed instrument.

[0040] The vibration system 1 of this embodiment includes a vibration device 2 that directly vibrates the strings 101 and a body vibration device 3 that directly vibrates the body 102. Therefore, the frequency characteristics of the vibration of the strings 101 by the vibration device 2 and the frequency characteristics of the vibration of the body 102 by the body vibration device 3 can be adjusted separately. This makes it easier to adjust the acoustic characteristics of a stringed instrument such as a double bass 100 compared to cases where only the strings 101 are vibrated or only the body 102 is vibrated.

[0041] Furthermore, in the vibration system 1 of this embodiment, if the frequency characteristics of the vibration of the string 101 and the frequency characteristics of the vibration of the body 102 are different, the vibration system 1 makes it easy to adjust the acoustic characteristics of a stringed instrument such as a double bass 100 by making the frequency characteristics of the vibration by the vibration device 2 and the frequency characteristics of the vibration by the body vibration device 3 different from each other.

[0042] Although the present invention has been described in detail above, the present invention is not limited to the embodiments described above, and various modifications can be made without departing from the spirit of the invention.

[0043] In the vibration device of the present invention, the force-applying part 28 of the clamping part 25 may be an elastic body such as a spring. That is, the elastic force of the elastic body may bring the two plate parts 26 and 27 closer together.

[0044] The vibration exciters of the present invention may be attached to multiple stringed instruments, for example. For example, one vibration exciter 2 may be attached to a portion of multiple strings 101 (for example, the two bass strings 101L), and another vibration exciter 2 may be attached to the remaining portion of the multiple strings 101 (for example, the two treble strings 101H). In this case, the frequency characteristics of the excitation signal received by the vibration exciters 2 may be common among the multiple vibration exciters 2, or they may be different. The frequency characteristics of the excitation signal may differ, for example, between the vibration exciter 2 attached to the treble string 101H and the vibration exciter 2 attached to the bass string 101L.

[0045] The vibration device of the present invention may be attached to each of several strings 101 of a stringed instrument, for example. In this case, each vibration device 2 can vibrate each string 101 at a frequency corresponding to the frequency band of each string 101. For example, a vibration device 2 attached to a low-pitched string 101L can vibrate the low-pitched string 101L at a low frequency corresponding to the low-frequency band of the low-pitched string 101L. This makes it possible to more closely approximate the acoustic characteristics of a stringed instrument when a performer plays it.

[0046] In the vibration excitation device of the present invention, the clamping portion 25 of the vibration transmission portion 22 is not limited to clamping the strings 101 of a stringed instrument, but may clamp any driven object (object to be excited). In other words, the vibration excitation device of the present invention is not limited to being applied to stringed instruments. [Explanation of symbols]

[0047] 1...Excitation system, 2...Excitation device, 3...Body vibration device, 21...Exciter, 22...Vibration transmission section, 23...Main body, 24...Vibrating body, 25...Clamping section, 26...First plate section, 27...Second plate section, 28...Force application section, 100...Double bass (stringed instrument), 101...Strings (driven body), 102...Body section, 103...Bridge

Claims

1. A vibrator having a main body and a vibrating body that vibrates in a predetermined vibration direction relative to the main body in response to an excitation signal, The system includes a vibration transmission unit that extends from the vibrating body and contacts the strings of a stringed instrument to transmit the vibrations of the vibrating body to the strings, The vibration transmission part includes a clamping part that holds the string, The vibration exciter is such that the clamping portion holds the string, thereby keeping the vibration transmission portion in contact with the string, A vibration device in which the entire vibration device is attached to the stringed instrument only via the string, by having the clamping portion clamp the string.

2. The vibration exciter according to claim 1, wherein the clamping portion holds the string from both sides to prevent it from falling.

3. The vibration excitation device according to claim 1 or claim 2, wherein the clamping portion clamps a plurality of the strings.

4. The vibration excitation device according to claim 1 or claim 2, wherein the clamping portion clamps one of the plurality of strings.

5. The vibration device according to any one of claims 1 to 4, wherein the vibration signal is a signal corresponding to a performance sound.

6. The vibration device according to any one of claims 1 to 5, wherein the vibration direction is a direction intersecting the axial direction of the string and along the surface of the body of the stringed instrument.

7. The vibration transmission part is in contact with a part of the string other than the part between the bridge and the fingerboard, according to any one of claims 1 to 6.

8. A vibration system comprising a vibration exciter according to any one of claims 1 to 7, and a body vibration exciter for directly exciting the body of the stringed instrument.

9. The body vibration device is pressed against the outer surface of the body by a pressing device, The vibration system according to claim 8, wherein the pressing device has a support portion that sandwiches the body vibration device between itself and the outer surface of the body portion, and a mounting portion that attaches the support portion to the body portion.

10. The vibration system according to claim 8 or 9, wherein the frequency characteristics of the vibration by the vibration exciter and the frequency characteristics of the vibration by the body vibration exciter are different from each other.

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