CN112104948B - Vibration applying device and musical instrument - Google Patents

Abstract

The invention suppresses the influence on the vibration application performance caused by external force. Providing a vibration application device (60) having: a 1 st unit (10); a 2 nd unit (20) that vibrates relatively to the 1 st unit (10) in accordance with an input signal and vibrates the back plate (33) in a state of being fixed to the back plate (33); a damper (23) connecting the 1 st unit (10) and the 2 nd unit (20); a protrusion (16) provided in the 1 st unit (10) and protruding in the vibration direction of the 2 nd unit (20) to a side away from a fixing position (P1) of the 2 nd unit (20) with respect to the back plate (33); and a restricting section (50) that restricts displacement of the protruding section (16) in a direction orthogonal to the vibration direction in a state of being fixed to the back plate (33).

Description

Vibration applying device and musical instrument

Technical Field

The present invention relates to a vibration applying device for applying vibration to a body to be vibrated and a musical instrument having the vibration applying device.

Background

Conventionally, a vibration device for vibrating a vibrating object is known. The vibration applying device is sometimes referred to as a vibrator, actuator, exciter, or transducer. The vibration device is operated by, for example, an audio signal, and generates sound by vibrating a target object such as a soundboard provided in a musical instrument or the like. Patent document 1 discloses a musical instrument provided with a vibration applying device. In patent document 1, a vibration applying device is provided inside a back plate of a guitar. In patent document 1, a dedicated bracket is fixed to the horn of the back plate, and a vibration applying device is held by the bracket.

Patent document 1: japanese patent laid-open publication No. 2017-129694

In general, the vibration applying device includes a magnetic circuit forming portion forming a magnetic circuit space, and includes a voice coil inserted into the magnetic circuit space. The distance between the magnetic path forming portion and the voice coil is preferably narrow in view of vibration performance. Further, if the vibration device receives an external force by the user's action (tapping, shaking) or the like with respect to the musical instrument, there is a possibility that the magnetic circuit forming portion and the voice coil may come into contact. If they are in contact with each other, the vibration performance is affected, and the generation of good sound is prevented. On the other hand, if the distance between the two members is set too wide in order to avoid contact therebetween, there is a problem that the vibration performance is lowered as described above.

Disclosure of Invention

An object of the present invention is to provide a vibration applying device and a musical instrument capable of suppressing an influence on vibration applying performance due to an external force.

According to one aspect of the present invention, there is provided a vibration applying device including: a 1 st unit; a 2 nd unit that vibrates relatively to the 1 st unit in accordance with an input signal and vibrates a vibrating object in a state of being fixed to the vibrating object; a damper connecting the 1 st unit and the 2 nd unit; a projection portion provided on the 1 st unit and projecting to a side away from a fixing position of the 2 nd unit with respect to the body to be vibrated in a vibration direction of the 2 nd unit; and a restricting portion that restricts displacement of the projecting portion in a direction orthogonal to the vibration direction in a state of being fixed to the body to be vibrated.

ADVANTAGEOUS EFFECTS OF INVENTION

According to one embodiment of the present invention, the influence on the vibration performance due to the external force can be suppressed.

Drawings

Fig. 1 is a plan view of a musical instrument having a vibration applying device.

Fig. 2 is a diagram showing an inner portion of the back plate.

Fig. 3 is a schematic cross-sectional view of a vibration applying apparatus.

Fig. 4 is a schematic diagram showing displacements at various positions when the 1 st unit swings.

Fig. 5 is a sectional view of the vibration applying device according to embodiment 2.

Fig. 6 is a schematic view of the restricting portion of the modification as viewed from the tip side of the projecting portion.

Fig. 7 is a schematic view of a portion where the regulating portion and the projecting portion are engaged.

Fig. 8 is a schematic view of a portion where the regulating portion and the projecting portion engage with each other.

Fig. 9 is an oblique view of the drum box.

Description of the reference numerals

10 st unit, 16 th projection, 20 nd unit, 2 nd unit, 23 damping member, 33 th back plate, 40 vibration applying part, 50, 70 limiting part, 60 vibration applying device, 72 surrounding part

Detailed Description

Embodiments of the present invention will be described below with reference to the drawings.

(embodiment 1)

Fig. 1 is a plan view of a musical instrument including a vibration applying device according to embodiment 1 of the present invention. As this musical instrument, a guitar 100 is exemplified. The guitar 100 is a so-called acoustic guitar. The guitar 100 has: a body 110; a neck 113 connected to the body 110; and a head 115 attached to the front end of the neck 113. The guitar 100 has 6 strings 125. The strings 125 are strung between the headstock 115 and a bridge 139 mounted on the face plate 31 of the body 110. The dial 31 has sound holes 143 for emitting sound generated by resonance in the internal space of the body 110 to the outside. The side plate 35 is provided with an input unit 47 for connection to an external sound source. In the body 110, an enlarged portion 49 is provided on the side plate 35.

Fig. 2 is a view showing an inner portion of the back plate 33 of the body 110. As shown in fig. 1 and 2, the body 110 is configured as a hollow box-shaped resonance box having a front panel 31, a back panel 33, and side panels 35. As shown in fig. 2, an anti-skinning member 53 and 4 banners 55A, 55B, 55C, and 55D are attached to the inner side surface 33a of the back plate 33. The peeling preventer 53 and the squealer rods 55A to 55D are fixed to the inner surface 33a at predetermined positions by adhesion, for example. The 4 rods 55A to 55D are provided on the inner surface 33a with a predetermined interval therebetween.

A vibration applying device 60 is attached to the inner surface 33a of the back plate 33. The vibration device 60 is disposed at a position avoiding the peeling preventer 53 and the squealer bars 55A to 55D. The vibration applying device 60 has a vibration applying portion 40 and a restricting portion 50. The acoustic signal (input signal) input from the input unit 47 is amplified by the amplifier 49 and input to the vibration applying unit 40 of the vibration applying device 60 via the acoustic cable 105.

Fig. 3 is a schematic cross-sectional view of the vibration applying device 60. The vibration applying section 40 includes the 1 st cell 10 and the 2 nd cell 20. The 1 st unit 10 and the 2 nd unit 20 can be relatively displaced in the vibration direction, i.e., the direction F1. The 2 nd unit 20 includes a cap 24, an annular bobbin 21, and a voice coil 22. The bobbin 21 is fixed to the cap 24. The voice coil 22 is formed of a wire wound around the outer peripheral surface of the bobbin 21. The thin-ended tip of the cap 24 is fixed to the inner surface 33a of the back plate 33 at a fixing position P1 by bonding or the like.

The 1 st unit 10 has a magnetic path forming portion 11 and a projection portion 16. The magnetic path forming portion 11 includes a plate 14, a magnet 13, and a yoke 12, which are arranged in this order. The opposing portion 12a of the yoke 12 closely opposes the voice coil 22. The flange portion 12b of the yoke 12 and the bobbin 21 of the 1 st unit 10 are connected by a Damper (Damper) 23. The damper 23 is formed into a disk shape by fibers or the like, and the disk-shaped portion has a wavy shape. The connection by the damper 23 prevents the voice coil 22 and the bobbin 21 from contacting the magnetic circuit forming portion 11, and the 2 nd unit 20 is supported by the 1 st unit 10 so as to be displaceable in the F1 direction. The damper 23 absorbs unnecessary movement in the vibration direction of the spool 21.

The voice coil 22 is inserted into the magnetic circuit space formed by the magnetic circuit forming portion 11, and vibrates to change the current flowing in itself. That is, if a current corresponding to an acoustic signal is input to the voice coil 22, the 2 nd cell 20 vibrates relatively in the F1 direction with respect to the 1 st cell 10. The 2 nd unit 20 vibrates the back plate 33 by the vibration. The vibration of the back plate 33 is converted into acoustic radiation.

The projecting portion 16 is a rod member projecting in the direction F1 toward the side (downward in fig. 3) away from the fixed position P1. The projection 16 is fixed to the yoke 12. The projection 16 is made of, for example, resin or the like. Further, the projecting portion 16 may be formed integrally with the yoke 12. The outer contour of the cross section of the projection 16 is circular. In addition, a hole 16b is formed in the projection 16. That is, the projection 16 is a hollow round bar. The direction in which the projection 16 extends is parallel to the F1 direction. The projecting portion 16 is displaced integrally with the yoke 12.

The gap Ca, which is the space between the voice coil 22 and the opposing portion 12a of the yoke 12, is very small. This is to exert high vibration performance. When the vibration applying section 40 vibrates, it is desirable that the 2 nd unit 20 and the 1 st unit 10 are not relatively displaced in the direction perpendicular to the direction F1. However, the vibration applying portion 40 may receive an external force including a component in a direction perpendicular to the direction of F1. The external force is an acceleration including gravity.

For example, the F1 direction does not coincide with the vertical direction (gravity direction) due to the posture of the guitar 100 during playing. Further, the user may receive an external force from the vibrating portion 40 by performing a tapping, shaking, or other operation on the guitar 100. When the vibration applying portion 40 receives the external force as described above, the 1 st unit 10 is rotationally displaced around the swing fulcrum C1. That is, the 1 st cell 10 swings about the swing fulcrum C1 in a direction intersecting the F1 direction. If an external force is applied to the vibration of the vibration applying portion 40, the 1 st unit 10 swings, and therefore the voice coil 22 may come into contact with the opposing portion 12 a. Therefore, the restricting portion 50 is provided to suppress the rotational displacement or the wobbling displacement of the 1 st unit 10.

Further, the position of the swing fulcrum C1 is determined according to the connection condition of the flange portion 12b and the spool 21 by the damper 23, and the like. For example, the connection position of the damper 23 and the spool 21 in the direction F1 on the central axis of the 1 st unit 10 becomes the swing fulcrum C1. Hereinafter, a state in which the vibration applying section 40 is in a non-vibrating state and is not subjected to an external force including a component in a direction perpendicular to the direction of F1 is referred to as an "initial state". The design value of the clearance Ca was determined as a value in the initial state. Further, the axial center of the projection 16 coincides with the central axis of the 1 st unit 10 in the initial state.

The shape of the restricting portion 50 is not limited, and is formed in a box shape covering the vibration applying portion 40, for example. The restricting portion 50 is integrally formed of a lightweight material such as resin. The restricting portion 50 may be integrally formed by joining a plurality of separate members. The regulating portion 50 is fixed to the inner surface 33a of the back plate 33 at a fixing position P2 by adhesion or the like. The restricting portion 50 is formed with a restricting hole 51 as a through hole. The projecting portion 16 penetrates the limiting hole 51, and the tip end portion 16a of the projecting portion 16 projects from the limiting hole 51 toward the side away from the fixed position P1. The limiting hole 51 is a circular surrounding portion that surrounds the vicinity of the distal end portion 16a of the projecting portion 16. The outer diameter of the projection 16 is the same, and the inner diameter of the limiting hole 51 is larger than the outer diameter of the projection 16. Therefore, in the initial state, the restriction hole 51 surrounds the projecting portion 16 without contacting the projecting portion 16. The tip end portion 16a of the projecting portion 16 may be inserted into the limiting hole 51 to such an extent that the projecting portion 16 does not recede to a position where the limiting hole 51 is not located when the 1 st unit 10 vibrates, and does not necessarily project from the limiting hole 51.

Further, when the worker fixes the vibrating portion 40 and the regulating portion 50 to the back plate 33, the worker fixes the vibrating portion 40 and the regulating portion 50 to the back plate 33 so that the center position of the regulating hole 51 coincides with the axial center position of the projecting portion 16.

If the displacement of the projecting portion 16 in the direction perpendicular to the direction F1 is suppressed, the rocking displacement of the 1 st unit 10 can also be suppressed. Since the tip end portion 16a of the projection 16 is farther from the swing fulcrum C1 than the yoke 12, the displacement amount in the direction perpendicular to the F1 direction when the 1 st unit 10 swings is large. That is, the displacement amount of the tip end portion 16a of the projecting portion 16 is larger than that of the yoke 12. Therefore, the displacement of the front end portion 16a of the projecting portion 16 is restricted by the restricting hole 51, whereby the design of the restricting amount of the swing displacement of the 1 st unit 10 becomes easy. This is illustrated in fig. 4.

Fig. 4 is a schematic diagram showing displacements at various positions when the 1 st unit 10 swings. As shown in fig. 3 and 4, Da is the distance from the pivot point C1 to the voice coil 22 in the direction F1. The distance from the pivot C1 to the restriction hole 51 in the direction F1 is designated by Db. The position of the voice coil 22 when the distance Da is determined is set to be the closest position of the facing portion 12a and the voice coil 22 when the 1 st unit 10 swings. The position of the restricting hole 51 when the distance Db is determined is set to a position at which the restricting hole 51 and the projecting portion 16 are closest to each other when the 1 st unit 10 swings. Further, Cb is a minimum interval between the limiting hole 51 and the projecting portion 16 in the initial state.

In order to prevent the voice coil 22 from contacting the facing portion 12a when the 1 st unit 10 swings, the gap Ca may not be zero. For this reason, the values are designed so that the relationship of (Ca/Da) > (Cb/Db) holds. With the design as described above, the regulating portion 50 can regulate the displacement of the projecting portion 16 within a range in which the opposing portion 12a of the magnetic circuit forming portion 11 and the voice coil 22 do not contact when the 1 st unit 10 swings integrally with the projecting portion 16.

According to the present embodiment, the projection 16 is provided in the 1 st unit 10 so as to project in the direction of F1 (vibration direction) to the side away from the fixing position P1. Further, a restricting portion 50 is provided for restricting displacement of the projecting portion 16 in a direction orthogonal to the direction F1 (vibration direction). Since the displacement of the projecting portion 16 is restricted, the facing portion 12a and the voice coil 22 can be prevented from coming into contact when the 1 st unit 10 swings, and therefore the vibration applying portion 40 can be protected, and the influence of the external force on the vibration applying performance of the vibration applying device 60 can be suppressed.

In particular, the relationship of (Ca/Da) > (Cb/Db) holds, and therefore, contact between the magnetic circuit forming portion 11 and the voice coil 22 can be reliably avoided. Since the gap Ca can be designed to be small, the vibration performance can be improved.

The regulating hole 51 of the regulating portion 50 surrounds the tip end portion 16a of the projecting portion 16 and abuts on the tip end portion 16a to regulate the displacement of the projecting portion 16. Therefore, the design of the limit amount of the rocking displacement of the 1 st unit 10 can be facilitated.

Further, since the outer contour shape of the cross section of the protruding portion 16 is circular and the limiting hole 51 is circular, the displacement amount of the protruding portion 16 can be equalized in all directions perpendicular to the direction F1. Therefore, the displacement of the projecting portion 16 can be effectively restricted without forming the restriction hole 51 excessively large.

In addition, in a state where no external force perpendicular to the direction F1 is applied, even if the 1 st unit 10 vibrates, the boss portion 16 does not contact the restricting hole 51, and therefore the vibration of the 1 st unit 10 is not hindered. Therefore, the influence on the vibration application performance can be reduced.

Further, since the projecting portion 16 is hollow, an increase in the moment of inertia of the 1 st unit 10 can be suppressed, and the influence on the vibration performance can be reduced. Further, the projection 16 does not have to be hollow.

The 1 st unit 10 is not fixed to the back plate 33, the bracket, or the like, and is not restrained by other members, and therefore can freely vibrate, contributing to improvement of vibration performance. In addition, a dedicated holding member such as a bracket is not required, and thus the structure is simple.

In addition, since the restricting portion 50 only has the restricting hole 51 to restrict the displacement of the projecting portion 16, the structure is simple and the cost is low. Further, since the restricting portion 50 only needs to be formed in accordance with the shape of the vibration applying portion 40, the versatility is high.

The 2 nd unit 20 and the restricting portion 50 are fixed to the back plate 33, which is the same member. If either one of the two is fixed to another member (for example, the surface plate 31), the protrusion 16 and the restriction hole 51 may not be concentric due to a difference in temporal change between the back plate 33 and the other member. However, since both are fixed to the same member, the influence of the change over time on the vibration performance can be reduced.

(embodiment 2)

Fig. 5 is a sectional view of a vibration applying device 60 according to embodiment 2 of the present invention. The vibration applying device 60 includes: a plate-like or film-like sheet portion 73 that can be fixed to the back plate 33 as a vibrating object; and a restricting portion 70. In embodiment 1, the regulating portion 50 and the vibrating portion 40 are each fixed to the back plate 33. In contrast, in the present embodiment, the sheet portion 73 is fixed to the back plate 33 in a state of the vibration applying device 60 in which the sheet portion 73 and the regulating portion 70 are fixed to be integrated. The structure of the vibration applying portion 40 is the same as that of embodiment 1.

The basic shape of the regulating portion 70 is the same as that of the regulating portion 50 in embodiment 1. However, the restricting portion 70 has a box-shaped portion 74 and a hat-shaped protrusion 71. The convex portion 71 is formed integrally with the box-shaped portion 74 as a part of the regulating portion 70, and protrudes from the box-shaped portion 74. The convex portion 71 may be provided by fixing a member that is separate from the box-shaped portion 74 to the box-shaped portion 74. The (box-shaped portion 74 of the) regulating portion 70 is fixed to the sheet portion 73 at the fixing position P4 by bonding or the like. The tip of the cap 24 of the 2 nd unit 20 is fixed to the sheet portion 73 by, for example, adhesion at a fixing position P3.

The protruding portion 71 is formed with a surrounding portion 72, and the tip of the protruding portion 71 is closed. Therefore, the vibration applying portion 40 is accommodated in a space sealed by the sheet portion 73 and the regulating portion 70. With this structure, the dustproof and waterproof functions of the vibration applying portion 40 are ensured. The shape of the surrounding portion 72 as a hole is the same as the shape of the restriction hole 51 (fig. 3) of the restriction portion 50. The relationship between the surrounding portion 72 and the protruding portion 16 in the direction F1 and the direction perpendicular to the direction F1 is the same as the relationship between the restriction hole 51 and the protruding portion 16. Further, in order to prevent the protrusion 16 from contacting the tip of the projection 71 when the 1 st unit 10 vibrates, a distance between the two in the direction F1 is set.

When manufacturing the vibration applying device 60, the worker fixes the cap portion 24 of the 2 nd unit 20 to the sheet portion 73 and then fixes the regulating portion 70 to the sheet portion 73. At this time, the operator fixes the regulating portion 70 so that the center position of the surrounding portion 72 coincides with the axial center position of the projecting portion 16. The material of the sheet portion 73 is not limited, but the sheet portion 73 is preferably as thin as possible in order to efficiently transmit the vibration of the 2 nd unit 20 to the back plate 33. However, the sheet-like portion 73 is made of a material and has a thickness that is not easily formed into wrinkles or the like and is not easily stretched so that the positional relationship between the fixed position P3 and the fixed position P4 does not change.

In the configuration described above, when the vibration applying portion 40 vibrates, the surrounding portion 72 restricts displacement of the distal end portion 16a of the projecting portion 16 in the direction perpendicular to the direction F1, as in the restricting hole 51 in embodiment 1.

According to the present embodiment, the same effects as those of embodiment 1 can be obtained with respect to protecting the vibration applying portion 40 and suppressing the influence of the external force on the vibration applying performance of the vibration applying device 60.

Further, since the vibration applying section 40 is accommodated in the space sealed by the sheet-shaped section 73 and the regulating section 70, the dust-proof and water-proof functions of the vibration applying section 40 can be realized.

The vibration device 60 can be used by fixing the sheet portion 73 to the back plate 33. In this case, since the surrounding portion 72 and the projecting portion 16 do not need to be aligned, the workability is high.

In addition, the restricting portion 70 in embodiment 2 may employ a restricting hole 51. Conversely, the convex portion 71 may be used as the restricting portion 50 in embodiment 1.

Various modifications will be described with reference to fig. 6 to 9. Fig. 6 is a schematic view of the restricting portion 50 of the modification as viewed from the tip end side of the projecting portion 16. The restricting portion 50 strictly speaking blocks the vibration of the back plate 33, and is therefore preferably as lightweight as possible. Therefore, the restricting portion 50 is not box-shaped, but has a shape of 4 frames 58(58A, 58B, 58C, 58D). The main portion 57 is formed with the above-described restriction hole 51. Extending from the main portion 57 are 4 frames 58, each of the 4 frames 58 being fixed to the back plate 33. With the above-described structure, the vibration performance of the vibration device 60 can be maintained high.

Further, the main section 57 and the frame 58 are formed integrally, but they may be formed separately, and the frame 58 may support the main section 57. The number of frames 58 is not limited to 4, and may be 1, 2, 3, or 5 or more. The configuration of fig. 6 can be applied to the regulating unit 70 of embodiment 2 even when the function of sealing the vibration applying unit 40 is not required.

Fig. 7 and 8 are schematic views of the interaction between the restricting portion 50 and the projecting portion 16. First, in embodiment 1, as shown in fig. 7, a bearing structure for supporting the protruding portion 16 may be provided in the restricting portion 50. That is, in the modification shown in fig. 7, the bearing portion 54 is provided in the limiting hole 51. The projection 16 can vibrate in the direction F1 while being supported by the bearing portion 54. The bearing portion 54 is not limited to the structure, and for example, a fluid bearing or a ball bearing may be used. In the initial state, the projection 16 may be in contact with the bearing portion 54, but may be set so as not to be in contact. With the above-described configuration, even when the projection 16 comes into contact with the bearing 54 during vibration, the displacement of the projection 16 becomes smooth, and thus the vibration is prevented from being hindered. In particular, by setting the interval between the bearing portion 54 and the projecting portion 16 in the initial state as small as possible, the maximum displacement of the projecting portion 16 becomes small, and therefore it is easy to design the gap Ca small.

In embodiment 1, as shown in fig. 7, a cushion material 59 may be provided in the regulating portion 50. That is, by providing the buffer material 59 such as felt in the limiting hole 51, the projecting portion 16 is brought into contact with the limiting hole 51 through the buffer material 59 during vibration. With this configuration, contact noise between the projection 16 and the restriction hole 51 can be suppressed. The modification shown in fig. 7 and 8 can also be applied to embodiment 2.

In the respective embodiments including the modified example, it is preferable to use a material having high slidability for the projecting portion 16 in order to suppress interference with free vibration of the projecting portion 16. From the viewpoint of realizing the restricting function of the projecting portion 16, the shapes of the restricting hole 51 and the surrounding portion 72 are not limited to the circular shape, and may be a partially missing shape. Alternatively, the shapes of the limiting hole 51 and the surrounding portion 72 and the cross-sectional outer contour shape of the protruding portion 16 may be shapes other than a circular shape.

Further, the axial center of the projection 16 does not necessarily coincide with the central axis of the 1 st unit 10. In addition, the projection 16 does not necessarily have to be rod-shaped. The number of the projections 16 may be 2 or more, and the displacement of at least 1 of the plurality of projections 16 may be restricted by the restricting portions 50 and 70. Further, the restricting portions 50, 70 and the 1 st unit 10 may be connected by a loose damper.

The unit (2 nd unit 20) including the voice coil 22 side out of the 1 st unit 10 and the 2 nd unit 20 is illustrated as being directly or indirectly fixed to the back plate 33. However, either the 1 st unit 10 or the 2 nd unit 20 may include the magnetic path forming portion 11, and the other may include the voice coil 22. Therefore, in contrast to the configurations of the above embodiments, the unit (the 1 st unit 10) including the magnetic path forming portion 11 side may be directly or indirectly fixed to the back plate 33. In this case, the projection 16 is provided to a unit (2 nd unit 20) including the voice coil 22 side.

In the unit 1, the magnetic path forming portion 11 is a so-called internal magnetic type magnetic path, but the present invention is not limited thereto. For example, an internal magnetic circuit of the so-called external magnetic type as disclosed in japanese patent application laid-open No. 2015-200828 and the like may be employed.

The object to which the vibration generator of the present invention is applied is not limited to musical instruments, and objects that produce sound by vibration can be used. For example, the vibrating device may be mounted inside the wall of the bath. Even when the present invention is applied to a musical instrument, the musical instrument to which the present invention is applied is not limited to a stringed musical instrument such as the guitar 100. For example, the present invention can also be applied to a musical instrument having a soundboard, such as a piano and a chime. Alternatively, as a musical instrument having no strings, a vibration device may be attached to the inside of the resonance box of the timpani or the inside of the cabinet drum shown in fig. 9.

Fig. 9 is an oblique view of the drum box 200. The main body 201 of the drum box 200 has a discharge hole 203. The vibration device 60 is provided on the back side of the striking surface 202 of the main body 201, for example.

The present invention has been described above in detail based on the preferred embodiments thereof, but the present invention is not limited to these specific embodiments, and various embodiments without departing from the scope of the present invention are also included in the present invention. Some of the above embodiments may be combined as appropriate.

Claims (11)

1. A vibration applying apparatus, comprising:

a 1 st unit;

a 2 nd unit that vibrates relatively to the 1 st unit in accordance with an input signal and vibrates a vibrating object in a state of being fixed to the vibrating object;

a damper connecting the 1 st unit and the 2 nd unit;

a projection portion provided on the 1 st unit and projecting to a side away from a fixing position of the 2 nd unit with respect to the body to be vibrated in a vibration direction of the 2 nd unit; and

a restricting portion that restricts displacement of the projecting portion in a direction orthogonal to the vibration direction in a state of being fixed to the body to be vibrated,

either one of the 1 st cell and the 2 nd cell includes a magnetic path forming portion forming a magnetic path space, and the other of the 1 st cell and the 2 nd cell includes a voice coil inserted into the magnetic path space,

the restricting portion restricts displacement of the projecting portion within a range in which the magnetic circuit forming portion and the voice coil do not contact,

the restricting portion includes an enclosing portion that encloses a periphery of the projecting portion,

da is a distance in the vibration direction from a swing fulcrum point when the 1 st unit swings in a direction intersecting the vibration direction integrally with the projection to the voice coil,

db is a distance from the swing fulcrum to the surrounding portion in the vibration direction,

ca is a distance between the magnetic circuit forming portion and the voice coil when the vibration device is in a non-vibration state and is not subjected to an external force including a component in a direction perpendicular to the vibration direction,

cb represents a distance between the surrounding portion and the protruding portion when the vibration device is in a non-vibration state and is not subjected to an external force including a component in a direction perpendicular to the vibration direction,

the relationship (Ca/Da) > (Cb/Db) holds.

2. The vibration applying apparatus according to claim 1,

the restricting portion includes an enclosing portion that encloses a periphery of the projecting portion.

3. The vibration application apparatus according to claim 1 or 2,

having a plate-like or film-like sheet-like portion capable of being fixed to the body to be vibrated,

the unit 2 and the regulating portion are fixed to the sheet portion.

4. The vibration applying apparatus according to claim 3,

the 1 st unit and the 2 nd unit are housed in a space sealed by the sheet-like portion and the regulating portion.

5. The vibration application apparatus according to claim 1 or 2,

the regulating portion regulates displacement of the projecting portion by abutting against a tip end portion of the projecting portion.

6. The vibration application apparatus according to claim 1 or 2,

the protruding portion does not contact the regulating portion when the vibration applying device is in a non-vibrating state and is not subjected to an external force including a component in a direction perpendicular to the vibrating direction.

7. The vibration applying apparatus according to claim 1,

the restricting portion has a bearing structure that supports the projecting portion,

the projecting portion is capable of vibrating in the vibration direction in a state of being supported by the bearing structure.

8. A musical instrument, having:

the vibration applying apparatus of claim 1 or 2; and

the body to be vibrated is a body to be vibrated,

the 2 nd unit and the restricting portion are fixed to the body to be vibrated.

9. The musical instrument according to claim 8,

the protruding portion does not contact the regulating portion when the vibration applying device is in a non-vibrating state and is not subjected to an external force including a component in a direction perpendicular to the vibrating direction.

10. A musical instrument, having:

the vibration applying apparatus of claim 3 or 4; and

the body to be vibrated is a body to be vibrated,

the sheet portion is fixed to the body to be vibrated.

11. The musical instrument according to claim 10,

the protruding portion does not contact the regulating portion when the vibration applying device is in a non-vibrating state and is not subjected to an external force including a component in a direction perpendicular to the vibrating direction.

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