WO2016017590A1 - Vibration exciter and musical instrument - Google Patents

Abstract

A vibration exciter comprising a vibration exciter main body and a vibrating body and generating sound by exciting a body to be excited, in a first direction. Resonance of plate springs caused by vibration of the vibrating body is suppressed, said plate springs being provided at a joint section of a coupling body that couples the vibrating body to the body to be excited. A vibration exciter 40 is provided that changes the natural frequency of a system including plate springs and a damping member 491, from the natural frequency of the plate springs by having the damping member fixed to the plate springs, said vibration exciter comprising: a vibration exciter main body 41; the vibrating body 44 provided so as to vibrate in the first direction relative to the vibration exciter main body; and the coupling body 45 that couples the vibrating body and the body 16 to be excited to each other and transmits the vibration of the vibrating body to the body to be excited. The coupling body comprises; an axis 46 extending between the vibrating body and the body to be excited; and the joint section 47 which permits slanting, in the first direction, of at least part of the axis. The joint section comprises spherical sections 473, 481, sockets 475, 483 into which part of the spherical sections are inserted, and plate springs 476, 484 that push the spherical sections into the sockets.

Description

Exciter and musical instrument

The present invention relates to a vibrator and a musical instrument provided with the vibrator.

2. Description of the Related Art Conventionally, various musical instruments such as keyboard musical instruments are provided with a vibrator that generates sound by vibrating a vibrating body such as a soundboard in a predetermined direction. This type of vibrator includes a magnetic path forming portion that forms a magnetic path and a vibrating body that is provided so as to protrude from the magnetic path forming portion. The vibrating body vibrates in the protruding direction with respect to the magnetic path forming portion.
Patent Document 1 discloses a mounting structure for a vibrator in which a magnetic path forming portion is fixed to a straight column or the like, and a tip portion in the protruding direction of the vibrating body is fixed to a vibrating body by bonding or the like. Thereby, when the vibrating body is vibrated with respect to the magnetic path forming portion, the vibrating body vibrates in a predetermined direction, and the vibration of the vibrating body becomes sound.

JP 2013-077000 A International Publication No. 2014/115482

By the way, a vibrating body such as a soundboard provided in a musical instrument may undergo dimensional change or deformation due to deterioration over time due to the influence of temperature and humidity. In particular, when the vibrating body is displaced in a direction (orthogonal direction) orthogonal to the vibration direction (predetermined direction), the vibrating body of the vibrator fixed to the vibrating body is orthogonal to the magnetic path forming portion. Will be displaced. In this case, problems such as noise mixed with the sound generated by the vibration of the vibrating body occur. Further, if the amount of displacement becomes excessively large, the vibrating body and the magnetic path forming unit may physically interfere with each other, and the vibrating body may not vibrate properly with respect to the magnetic path forming unit.

Therefore, in recent years, it has been considered that the vibrating body and the vibrating body are coupled by a rod-shaped coupling body including a joint (universal joint) without directly connecting the vibrating body to the vibrating body ( For example, see Patent Document 2). In this case, when the vibrating body is displaced with respect to the orthogonal direction due to aging deterioration or the like, the function of the joint portion (universal joint) causes a portion on the vibrating body side of the joint portion (universal joint) in the connected body. However, it is permitted to incline with respect to the vibration direction of the vibrating body. Thereby, the amount of displacement of the vibrating body in the orthogonal direction with respect to the magnetic path forming portion can be suppressed to be small, and the vibrating body can be appropriately vibrated with respect to the magnetic path forming portion.

Here, when the joint part (universal joint) has a ball joint structure in which the spherical part is rotatably held inside the retainer part, the retainer part includes a socket part into which a part of the spherical part is inserted, and the spherical part. It is good to provide the leaf | plate spring which presses against a socket part. Thereby, it can suppress that a spherical part vibrates inside a retainer part by the vibration of a vibrating body.
However, when the joint part (universal joint) has the above-described leaf spring, the leaf spring may resonate depending on the frequency of the vibrating body, and an unintended sound is generated by the vibration of the leaf spring. The sound based on the vibration of the leaf spring is not preferable because it is mixed with the sound generated by the vibration of the body to be excited as noise.

The present invention has been made in view of the above-described circumstances, and an object thereof is to provide an exciter capable of suppressing resonance of a leaf spring provided in a joint portion of a connected body, and a musical instrument including the same. And

In order to solve the above-described problems, an exciter according to the present invention is an exciter that generates a sound by vibrating an excited body in a first direction. The exciter body and the exciter body A vibrating body provided so as to vibrate in the first direction, a coupling body that interconnects the vibrating body and the excited body, and transmits vibration of the vibrating body to the excited body; The connecting body allows a shaft portion extending between the vibrating body and the excited body, and at least a part of the shaft portion to be inclined with respect to the first direction. A joint portion, and the joint portion includes a spherical portion, and a retainer portion that rotatably holds the spherical portion, and the retainer portion inserts a part of the spherical portion; A leaf spring that presses the spherical portion against the socket portion, and a damping member is fixed to the leaf spring.

According to the vibrator of the present invention, it is possible to suppress the leaf spring from resonating due to the vibration of the vibrating body by providing the damping member on the leaf spring.

In the vibrator, the damping member may be made of a material softer than the material of the leaf spring.

According to the above configuration, the natural frequency of the system including the leaf spring and the damping member can be made lower than the natural frequency of the leaf spring. Further, the spring constant of the damping member is smaller than the spring constant of the leaf spring. Thereby, when the vibrating body vibrates, the damping member is deformed (flexed) before the leaf spring, and the properties of the leaf spring (for example, the leaf spring property that presses the spherical portion against the socket portion) are maintained. The vibration of the leaf spring can be suitably damped as it is.

In the vibrator, the damping member may be formed to be elastically deformable, and may be sandwiched between the leaf spring and any one of the vibrator main body and the body to be shaken. .

According to the above configuration, even if the vibration of the vibrating body is transmitted to the leaf spring, the damping member provided between the leaf spring and the vibrator main body or the body to be excited is elastically deformed, thereby Vibration can be suitably suppressed.
In the vibrator, the leaf spring includes a main body plate portion and a plurality of spring portions protruding from the main body plate portion and arranged apart from each other in a circumferential direction of the spherical portion. The vibration member may be fixed to the main body plate portion.
In the vibration exciter, a plurality of the damping members may be arranged apart from each other in the circumferential direction corresponding to the plurality of spring portions.
Furthermore, in the vibration exciter, the damping member may be fixed to a surface of the main body plate portion facing the vibration exciter body.
In the vibrator, the vibrator main body may include a protruding portion that faces the main body plate portion and contacts the vibration damping member.
Furthermore, in the vibration exciter, the vibration damping member may be fixed to a surface of the main body plate portion facing the vibration body.

Further, in the vibration exciter, the outer shape of the leaf spring in plan view is formed in a circular shape or a polygonal shape centering on the axis of the shaft portion, and the damping member is an outer peripheral portion of the leaf spring. May be formed in a ring shape corresponding to the plan view.

According to the above configuration, the damping member can be provided with good balance in the entire circumferential direction with respect to the leaf spring with only one damping member. That is, the damping member can be easily provided with respect to the leaf spring.

The musical instrument of the present invention includes a vibration body that generates sound by vibration in a first direction, and the vibration exciter.

According to the present invention, it is possible to suppress the resonance of the leaf spring provided in the joint portion of the connected body.

It is a sectional side view showing the piano containing the vibrator concerning one embodiment of the present invention. It is a bottom view explaining the attachment position of the vibrator in the piano of FIG. It is a bottom view which expands and shows the state which attached the vibrator to the piano shown in FIG. FIG. 4 is a sectional view taken along line IV-IV in FIG. 3. FIG. 5 is a sectional view taken along line VV in FIG. 3. It is a longitudinal cross-sectional view which shows the magnetic path formation part and vibrating body of the vibrator shown to FIG. It is a bottom view which expands and shows the middle joint part of the connection body shown to FIG. FIG. 8 is a sectional view taken along line VIII-VIII in FIG. 7. It is a bottom view which expands and shows the front-end | tip joint part of the coupling body shown to FIG. FIG. 10 is a sectional view taken along line XX in FIG. 9. FIG. 6 is a perspective view showing a restriction holder portion provided in the vibrator shown in FIGS. It is a schematic plan view which shows the relative positional relationship of the middle joint part of FIG. 7, and the holder of FIG. It is a bottom view which shows the modification of the damping member provided in the middle joint part of the connection body shown to FIG. It is sectional drawing which shows the modification of the installation location of the damping member with respect to the front-end | tip joint part of the coupling body shown to FIG.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. In this embodiment, the piano 1 which is one of the keyboard instruments is illustrated as an instrument to which the vibrator of the present invention is applied. 1 and 2, when viewed from the player of the piano 1, the left-right direction is the X-axis direction, and the front-rear direction is the Y-axis direction. 1 to 12, the vertical direction when viewed from the player of the piano 1 is the Z-axis direction.
As shown in FIGS. 1 and 2, the piano 1 according to this embodiment is a grand piano which is a kind of acoustic piano. The piano 1 includes a housing 11, a keyboard portion 12, a pedal 13, an action mechanism 14, a damper mechanism 15, a soundboard (vibrated body) 16, a string 17 and the like.

The housing 11 is swingably connected to the shelf board 18, the bending side plate 19, the bending column 20, the straight column 21, the front rod 22, the large roof 23, and the front end of the large roof 23. A front roof 24, a pedal column 25, a pedal box 26, and a leg column 27 are provided.

The shelf board 18 is for mounting the keyboard part 12 mentioned later.
The kneading side plate 19 is fixed along the edge of the shelf plate 18 and is disposed so as to extend rearward from the shelf plate 18 (left side in FIG. 1).
The bending column 20 is fixed along the inner surface of the bending side plate 19. The straight strut 21 is bridged mainly in the front-rear direction between the bending strut 20 and the collector 28 fixed to the rear end of the shelf board 18. The straight column 21 is arranged at a position close to the lower end side of the bending side plate 19. These bending struts 20 and straight struts 21 serve to impart rigidity to the bending side plate 19.

The front bar 22 is arranged on the upper side (upper side in FIG. 1) of the shelf board 18 on the front end side (right side in FIG. 1) of the bending side plate 19 and forms the front surface of the housing 11. A part of the shelf board 18 protrudes to the front side of the front barb 22.
The large roof 23 is connected to the bent side plate 19 so as to be swingable at the rear of the front ridge 22. The large roof 23 moves between a position (closed position) that contacts the upper end of the curved side plate 19 together with the front roof 24 to cover the upper opening of the curved side plate 19 (closed position) and an open position (open position). Thus, it can swing with respect to the bending side plate 19. In FIG. 1, the large roof 23 and the front roof 24 are arranged in an open position.
The pedal column 25 extends downward from the lower surface side of the shelf board 18. The pedal box 26 is fixed to the tip of the pedal column 25.
The pedestal 27 includes left and right portions of the pedal column 25 in the lower surface of the shelf 18 positioned on the front surface side of the housing 11, and the bending column 20 and the straight column 21 positioned on the rear end side of the housing 11. It extends downward from each part below.

The keyboard unit 12 has a plurality of keys 31 arranged in the left-right direction that are operated by a player's fingers. Each key 31 is swingably provided on the shelf 18 via a collar 32. Further, the front end portion of each key 31 is exposed to the outside on the front side of the housing 11 (right side in FIG. 1).
The pedal 13 is an operator that is operated by a player's foot, and is provided exposed on the front surface of the pedal box 26.

The action mechanism 14 and the damper mechanism 15 are provided in association with each key 31 and are arranged above the rear end portion of the key 31. The action mechanism 14 is a mechanism for converting the key pressing force of the key 31 by the fingers of the performer into a string striking force (striking force) for striking the string 17 with the hammer 33.
The damper mechanism 15 converts the key pressing force of the key 31 and the stepping force by which the damper pedal, which is one of the pedals 13, is stepped on by the player's foot into a string separation force that separates the damper 34 on the string 17 from the string 17. It is a mechanism to do.

The soundboard 16 is provided between the large roof 23 and the straight column 21 disposed in a closed position inside the curved side plate 19 so that the thickness direction thereof is directed in the vertical direction.
The string 17 is provided in association with each key 31 and is stretched on the upper surface 16 a of the soundboard 16.
Further, on the upper surface 16a of the soundboard 16, a piece 35 for locking a part of the stretched string 17 is provided. On the other hand, a sounding bar 36 is provided on the lower surface 16 b of the sounding board 16 facing the straight column 21.

In the piano 1 configured as described above, for example, when one string 17 is struck by the hammer 33 and vibrates, the vibration of the one string 17 is transmitted to the soundboard 16 via the piece 35, and the soundboard 16 is Vibrate. The vibration of the soundboard 16 propagates in the air and becomes sound. That is, the soundboard 16 is pronounced by being vibrated. The vibration of the soundboard 16 is transmitted to the other strings 17 through the pieces 35, and the other strings 17 also vibrate.
The soundboard 16 vibrates mainly in the thickness direction (Z-axis direction). In the following description, the vibration direction of the soundboard 16 is referred to as a predetermined direction.

The piano 1 of this embodiment includes a vibrator 40 that generates sound by vibrating the soundboard 16 in a predetermined direction (Z-axis direction). Hereinafter, the vibrator 40 will be described with reference to FIGS.
As shown in FIGS. 3 to 6, the vibrator 40 is a voice coil type actuator, and vibrates in a predetermined direction (Z-axis direction) with respect to the vibrator main body 41 and the vibrator main body 41. The vibration body 44 provided, and the connection body 45 which mutually connects the vibration body 44 and the sound board 16 and transmits the vibration of the vibration body 44 to the sound board 16 are provided.

The vibrator main body 41 includes a magnetic path forming unit 42 that forms a magnetic path. As shown in FIG. 6, the magnetic path forming portion 42 of the present embodiment is formed with an insertion hole 420 that penetrates in a predetermined direction (Z-axis direction) and allows a connecting body 45 described later to pass therethrough.
The magnetic path forming unit 42 of this embodiment includes a top plate 421, a magnet 422, and a yoke 423.
The top plate 421 is made of, for example, a soft magnetic material such as soft iron, and is formed in a disk shape having a through hole 424 in the center.

The yoke 423 is made of, for example, a soft magnetic material such as soft iron, and is configured by integrally forming a disk-shaped disk part 425 and a columnar columnar part 426 protruding from the center of the disk part 425. Yes. The axes of the disc portion 425 and the cylindrical portion 426 coincide with each other. The outer diameter dimension of the cylindrical portion 426 is set to be smaller than the inner diameter dimension of the through hole 424 of the top plate 421. The aforementioned insertion hole 420 of the magnetic path forming portion 42 is formed so as to penetrate the disc portion 425 and the cylindrical portion 426 of the yoke 423 in the axial direction thereof.
The magnet 422 is a permanent magnet formed in an annular shape. The inner diameter dimension of the magnet 422 is set larger than the inner diameter dimension of the through hole 424 of the top plate 421.

The magnet 422 is fixed to the disc portion 425 of the yoke 423 after inserting the column portion 426 of the yoke 423. Furthermore, the top plate 421 has a magnet 422 so that the magnet 422 is sandwiched between the top plate 421 and the disc portion 425 of the yoke 423, and the tip of the cylindrical portion 426 is inserted into the through hole 424 of the top plate 421. Fixed to.
In the state where the top plate 421, the magnet 422, and the yoke 423 are fixed to each other as described above, these axes coincide with each other and form the axis C1 of the magnetic path forming portion.

In the magnetic path forming part 42 of the present embodiment configured as described above, a magnetic path MP that returns from the magnet 422 to the magnet 422 through the top plate 421, the cylindrical part 426, and the disk part 425 in order is formed. As a result, a magnetic field including a radial component of the cylindrical portion 426 is generated between the inner peripheral surface of the through hole 424 of the top plate 421 and the outer peripheral surface of the cylindrical portion 426 of the yoke 423. That is, the space between the inner peripheral surface of the through hole 424 of the top plate 421 and the outer peripheral surface of the cylindrical portion 426 of the yoke 423 is a magnetic field space 427 in which the above-described magnetic field is generated.

The vibrating body 44 is provided so as to vibrate in a predetermined direction (Z-axis direction) with respect to the magnetic path forming portion 42 described above. The vibrating body 44 is disposed on the one opening 420A side of the insertion hole 420 of the magnetic path forming portion 42. The vibrating body 44 is supported by the magnetic path forming portion 42 by the damper portion 48. The vibrating body 44 is detachably fixed to a connecting body 45 described later by a fixing means 440. Hereinafter, the vibrating body 44 of the present embodiment will be described in detail.

The vibrating body 44 of the present embodiment includes a bobbin 441, a voice coil 442, and a cap 443.
The bobbin 441 is formed in a cylindrical shape. The bobbin 441 is inserted into the cylindrical portion 426 of the magnetic path forming portion 42 and is inserted into the through hole 424 of the top plate 421. The axis of the bobbin 441 forms the axis C2 of the vibrating body 44.
The voice coil 442 is a conducting wire wound around one end of the outer peripheral surface of the bobbin 441 in the direction of the axis C2.

The cap 443 is fixed to the bobbin 441 so as to close the opening on the other end side of the bobbin 441 in the axial direction. Further, the cap 443 is formed with a hole that penetrates in the axial direction of the bobbin 441 and can be inserted into a connecting body 45 described later. Further, the cap 443 is provided with the above-described fixing means 440 for the vibrating body 44. The fixing means 440 fixes the connecting body 45 inserted through the hole of the cap 443 to the cap 443, and is a chuck device, for example.

The bobbin 441 is arranged such that one end of the bobbin 441 around which the voice coil 442 is wound is positioned in the magnetic field space 427 of the magnetic path forming unit 42 disposed on the one opening 420A side of the insertion hole 420. Is attached to the magnetic path forming portion 42 by a damper portion 48 so that the other end of the protrusion protrudes from the magnetic path forming portion 42.

The damper portion 48 serves to support the vibrating body 44 so that the vibrating body 44 does not contact the magnetic path forming portion 42, and the axis C <b> 2 of the vibrating body 44 coincides with the axis C <b> 1 of the magnetic path forming portion 42. It plays a role of supporting the body 44 so as to be displaceable in the direction of the axis C1 of the magnetic path forming portion 42 with respect to the magnetic path forming portion 42.
The damper portion 48 of the present embodiment is formed in an annular shape. Moreover, the damper part 48 is formed in the bellows shape which waves in the radial direction. The inner edge of the damper portion 48 is fixed to the other end portion of the bobbin 441, and the outer edge of the damper portion 48 is fixed to the top plate 421. Such a damper portion 48 is formed to be elastically deformable by, for example, a fiber or a resin material.

In the vibrator 40 including the magnetic path forming unit 42 and the vibrating body 44 described above, for example, a current corresponding to an audio signal flows through the voice coil 442 disposed in the magnetic field space 427, so that the vibrating body 44 forms a magnetic path. It vibrates in the direction of the axis C1 of the part 42. The audio signal is generated as a drive signal for driving the vibrating body 44 in a control device (not shown) based on audio data stored in a storage unit (not shown), for example.

As shown in FIGS. 4 to 6, the connecting body 45 includes a shaft portion 46 extending between the vibrating body 44 and the soundboard 16, and at least a part of the shaft portion 46 with respect to a predetermined direction (Z-axis direction). And an articulating portion 47 that permits tilting.
The shaft portion 46 of the present embodiment includes a rod-shaped vibrating body side shaft portion 461 that protrudes from the vibrating body 44 side toward the soundboard 16, and a rod-shaped workpiece that protrudes from the soundboard 16 side toward the vibrating body 44 side. And a vibrator side shaft portion 462. In addition, the joint portion 47 of the present embodiment includes a midway joint portion 471 that interconnects the above-described vibration body side shaft portion 461 and the vibration body side shaft portion 462, and a vibration body side shaft that is located on the soundboard 16 side. And a tip joint portion 472 provided at an end of the portion 462 in the axial direction.

A first end portion in the axial direction of the vibrating body side shaft portion 461 is detachably fixed to the vibrating body 44 by the fixing means 440. In the present embodiment, the first end portion of the vibrating body side shaft portion 461 is inserted into the insertion hole 420 of the magnetic path forming portion 42 and then fixed to the cap 443 of the vibrating body 44 by the fixing means 440. Thereby, the axis of the vibrating body side shaft portion 461 coincides with the axis C2 of the vibrating body 44. In this state, the second end portion of the vibrating body side shaft portion 461 protrudes from the other opening 420B of the insertion hole 420 toward the soundboard 16.
A first end portion in the axial direction of the vibrating body side shaft portion 462 is connected to the vibrating body side shaft portion 461 via a midway joint portion 471 described later. Further, the second end of the vibrating body side shaft portion 462 is connected to the soundboard 16 via a distal joint portion 472 described later.

The midway joint portion 471 allows the axis C2 of the vibrating body side shaft portion 461 and the axis C3 of the vibrating body side shaft portion 462 to be inclined with respect to each other. The midway joint portion 471 has a so-called ball joint structure.
The midway joint part 471 includes a spherical part 473 and a retainer part 474 that rotatably holds the spherical part. In the present embodiment, the spherical portion 473 is formed at the second end portion of the vibrating body side shaft portion 461 and the retainer portion 474 is provided at the first end portion of the vibrating body side shaft portion 462. May be. In the present embodiment, the center P <b> 1 of the spherical portion 473 is located on the axis C <b> 2 of the vibrating body side shaft portion 461.

As shown in FIGS. 7 and 8, the retainer portion 474 of the midway joint portion 471 includes a socket portion 475 into which a part of the spherical portion 473 is inserted, and a leaf spring 476 that presses the spherical portion 473 against the socket portion 475.
In the present embodiment, the socket portion 475 is provided integrally with the first end portion of the vibrating body side shaft portion 462. The concave portion 477 of the socket portion 475 into which the spherical portion 473 is inserted is a surface 475a (hereinafter referred to as an opening surface 475a) of the socket portion 475 facing the side opposite to the side to which the first end of the vibrating body side shaft portion 462 is connected. Open.)

The leaf spring 476 is formed in a plate shape that can be elastically deformed. The outer shape of the leaf spring 476 in plan view may be formed, for example, in a polygonal shape centered on the axis of the vibration body side shaft portion 461. However, in this embodiment, a circle centering on the axis of the vibration body side shaft portion 461 is used. It is formed into a shape.
The plate spring 476 includes a main body plate portion 478 formed in an annular shape in plan view, and a plurality (three in the illustrated example) of spring portions 479 projecting radially inward from the inner edge of the main body plate portion 478. The main body plate portion 478 of the present embodiment is formed in an annular shape in plan view centering on the axis of the vibrating body side shaft portion 461 corresponding to the spherical portion 473.
Each spring part 479 can be elastically bent in the plate thickness direction of the main body plate part 478 with its protruding direction base end as a fulcrum. The plurality of spring portions 479 are arranged at intervals in the circumferential direction of the main body plate portion 478.

The plate spring 476 is fixed by being overlapped on the opening surface 475a of the socket portion 475 after the vibration body side shaft portion 461 is inserted through the main body plate portion 478. In a state where the leaf spring 476 is fixed to the socket portion 475, the distal end portion of each spring portion 479 is pressed against the spherical portion 473 inserted into the concave portion 477 of the socket portion 475, and each spring portion 479 is elastically bent. The spherical portion 473 is pressed against the inner surface of the concave portion 477 of the socket portion 475 by the elastic force of the spring portion 479.

Furthermore, the size of the socket portion 475 of the present embodiment is smaller than the leaf spring 476 in plan view shown in FIG. 7 so that the weight of the entire retainer portion 474 is reduced. The socket portion 475 is disposed so as to be located on the radially inner side of the main body plate portion 478 of the leaf spring 476.
More specifically, the socket portion 475 has a concave portion 477, and a main body portion 475B positioned radially inward of the main body plate portion 478 of the leaf spring 476 in a plan view, and a radially outer side from the main body portion 475B. A plurality of screwing protrusions 475C. The number of screwing protrusions 475C matches the number of spring portions 479 of the leaf spring 476 described above. That is, the number of screwing protrusions 475C in the illustrated example is three.
On the other hand, the leaf spring 476 of the present embodiment includes a plurality of (three in the illustrated example) screwing plate portions extending radially inward from the inner edge of the main body plate portion 478 between the spring portions 479 adjacent to each other. 476C is provided. The distal end portion of each screwing plate portion 476 </ b> C is disposed so as to overlap with each screwing projection portion 475 </ b> C of the socket portion 475 and is fixed to each screwing projection portion 475 </ b> C by a screw 480.

The center P1 of the midway joint portion 471 (spherical portion 473) configured as described above is located on the axes C2 and C3 of both the vibrating body side shaft portion 461 and the excited body side shaft portion 462. Thus, the axes C2 and C3 of the vibrating body side shaft portion 461 and the shaker side shaft portion 462 can be inclined with respect to each other about the center P1 of the midway joint portion 471. That is, the connection body 45 of this embodiment can be bent at the midway joint portion 471.

As shown in FIG. 4, the tip joint portion 472 allows the axis C3 of the shaker-side shaft portion 462 to be inclined with respect to a predetermined direction (Z-axis direction). The tip joint 472 has a ball joint structure similar to that of the midway joint 471.
The distal joint portion 472 includes a spherical portion 481 and a retainer portion 482 similar to the midway joint portion 471. In the tip joint portion 472 of this embodiment, a spherical portion 481 is formed at the second end portion of the vibrating body side shaft portion 462, and the retainer portion 482 is fixed to the soundboard 16 side. The center P <b> 2 of the spherical portion 481 is located on the axis C <b> 3 of the vibrating body side shaft portion 462.

As shown in FIGS. 9 and 10, the retainer portion 482 includes a socket portion 483 into which a part of the spherical portion 481 is inserted and a plate that presses the spherical portion 481 against the socket portion 483 as in the case of the intermediate joint portion 471 described above. A spring 484 is provided.
The socket part 483 of the tip joint part 472 is fixed to the soundboard 16 side. The concave portion 485 of the socket portion 483 into which the spherical portion 481 is inserted opens to a surface 483a (hereinafter referred to as an opening surface 483a) of the socket portion 483 facing the sound board 16 and the opposite side.

The leaf spring 484 of the tip joint portion 472 is formed in the same manner as the leaf spring 476 of the midway joint portion 471 (see FIGS. 7 and 8). That is, the leaf spring 484 of the distal joint 472 is formed in a plate shape that can be elastically deformed. The leaf spring 484 is formed in a circular shape centered on the axis of the vibrating body side shaft portion 462. Further, the plate spring 484 includes a main body plate portion 486 formed in an annular shape in plan view, and a plurality (three in the illustrated example) of spring portions 487 projecting radially inward from the inner edge of the main body plate portion 486. The main body plate portion 486 of the present embodiment is formed in an annular shape in plan view. Each spring portion 487 can be flexibly elastically bent in the plate thickness direction of the main body plate portion 486 with its protruding direction base end as a fulcrum. The plurality of spring portions 487 are arranged at intervals in the circumferential direction of the main body plate portion 486.

The leaf spring 484 is fixed by being overlapped on the opening surface 483 a of the socket portion 483 after inserting the vibrating body side shaft portion 462 through the main body plate portion 486. In a state where the leaf spring 484 is fixed to the main body plate portion 486, the distal end portion of each spring portion 487 is pressed against the spherical portion 481 inserted in the recess portion 485 of the socket portion 483, and each spring portion 487 is elastically bent. The spherical portion 481 is pressed against the inner surface of the concave portion 485 of the socket portion 483 by the elastic force of the spring portion 487.

Furthermore, the size of the socket portion 483 of this embodiment is smaller than the leaf spring 484 in plan view, as shown in FIG. 9, so that the weight of the entire retainer portion 482 is reduced.
More specifically, the socket portion 483 has a recess 485 similar to the socket portion 483 (see FIG. 7) of the midway joint portion 471, and the radial direction of the main body plate portion 486 of the leaf spring 484 in plan view. A main body portion 483B located on the inner side and a plurality of screwing projection portions 483C projecting radially outward from the main body portion 483B are provided. The number of screwing projections 483C matches the number of spring portions 487 of the leaf spring 484 described above. That is, the number of screwing protrusions 483C in the illustrated example is three. However, the protruding length of the screwing projection 483C of the distal joint 472 is set longer than the screwing projection 475C (see FIG. 7) of the midway joint 471.
On the other hand, the leaf spring 484 extends inward in the radial direction from the inner edge of the main body plate portion 486 between the spring portions 487 adjacent to each other, like the leaf spring 476 (see FIG. 7) of the midway joint portion 471. (Three in the illustrated example) are provided with screwing plate portions 484C. The distal end portion of each screwing plate portion 484C is arranged so as to overlap the protruding direction base end portion of each screwing projection portion 483C of the socket portion 483, and is fixed to each screwing projection portion 483C by a screw 490. The

Further, the leaf spring 484 of the distal joint 472 is formed with an exposure hole 488 that penetrates in the thickness direction and exposes the distal end in the protruding direction of the screwing projection 483C of the socket 483. The exposure hole 488 is used when the socket portion 483 of the tip joint portion 472 is fixed to the soundboard 16 side by screws.
In the present embodiment, the shape of the leaf spring 476 (see FIG. 7) of the midway joint portion 471 described above is formed in the same shape as the leaf spring 484 of the tip joint portion 472 described above. That is, as shown in FIG. 7, an exposure hole 488 is also formed in the leaf spring 476 of the midway joint portion 471 of this embodiment.

7 to 10, a damping member 491 is fixed to the leaf springs 476 and 484 of the midway joint portion 471 and the tip joint portion 472 by adhesion or the like. As a result, the natural frequency of the system including the leaf springs 476 and 484 and the damping member 491 changes from the natural frequency of the leaf springs 476 and 484. The damping member 491 is made of a material softer than the material of the leaf springs 476 and 484 (for example, a material having a smaller spring constant than the material constituting the leaf springs 476 and 484). The vibration damping member 491 is formed to be elastically deformable. Specific examples of the material for the vibration damping member 491 include urethane foam.

The damping member 491 of the present embodiment is formed in a block shape, and is fixed to the main body plate portions 478 and 486 of the leaf springs 476 and 484 formed in an annular shape in plan view. More specifically, the damping member 491 is fixed so that its circumferential position coincides with the spring portions 479 and 487. Further, one damping member 491 is provided for each of the spring portions 479 and 487. That is, each of the leaf springs 476 and 484 is provided with a plurality of (three in the illustrated example) damping members 491.

The damping member 491A fixed to the leaf spring 476 of the midway joint portion 471 is fixed to the surface of the leaf spring 476 facing the vibrator main body 41. The vibration damping member 491A is sandwiched between the leaf spring 476 and the vibrator main body 41. As shown in FIGS. 4 and 5, the vibration damping member 491A of the present embodiment is in contact with an engagement plate portion 434 (or a clamping plate portion 438) described later, and a leaf spring 476 and a vibration exciter. It is sandwiched between the main body. The vibration damping member 491A is not limited to this configuration, and the leaf spring 476 is in a state of being in direct contact with the vibrator main body 431 or in a state of being in contact with a member relatively fixed to the vibrator main body 431. And the vibrator main body 41 may be sandwiched.
On the other hand, the damping member 491B fixed to the leaf spring 484 of the distal joint 472 is fixed to the surface of the leaf spring 484 facing the lower surface 16b of the soundboard 16. Further, the vibration damping member 491B is sandwiched between the leaf spring 484 and the soundboard 16. 4 and 10, an intervening component 60 described later is interposed between the vibration damping member 491B and the soundboard 16. That is, the damping member 491B is sandwiched between the leaf spring 484 and the soundboard 16 in a state where it is in contact with the interposed member 60. For this reason, the damping member 491B does not contact the soundboard 16. However, the present invention is not limited to this, and the vibration damping member 491B may directly contact the soundboard 16, for example.

Further, as shown in FIGS. 4 and 5, the vibrator main body 41 of the present embodiment is engaged with the vibration body side shaft portion 461, so that the vibration body side shaft portion 461 is engaged at the position where the vibration body side shaft portion 461 is engaged. Is provided with a restriction holder portion 43 that restricts movement in the direction intersecting the axis C2 direction while allowing movement in the direction of the axis C2.
The restriction holder portion 43 of this embodiment includes a frame portion 431 and a contact member 432.

The frame portion 431 is formed by bending a plate-like member made of metal or the like as shown in FIGS. The frame portion 431 is formed between the fixed plate portion 433 and the fixed plate portion 433 which is formed in a flat plate shape and fixes the magnetic path forming portion 42 so that the axis C1 direction of the magnetic path forming portion 42 faces the plate thickness direction. The engaging plate portion 434 is arranged in parallel with the fixed plate portion 433 so that the magnetic path forming portion 42 is positioned, and is formed to extend in the direction of the axis C1 of the magnetic path forming portion 42 at the side of the magnetic path forming portion 42. A connecting plate portion 435 that connects the fixing plate portion 433 and the engaging plate portion 434 to each other.

The end surface of the magnetic path forming portion 42 on which the vibrating body 44 protrudes is overlapped and fixed to the fixing plate portion 433 of the present embodiment. An opening hole 436 that penetrates in the thickness direction is formed in the fixed plate portion 433, thereby preventing the fixed plate portion 433 from interfering with the vibrating body 44, the vibrating body side shaft portion 461, and the like protruding from the magnetic path forming portion 42. It is out. The opening hole 436 in the illustrated example opens at the distal end in the extending direction of the fixed plate portion 433 extending from the connection plate portion 435, but is not limited thereto.

On the other hand, the engaging plate portion 434 is disposed between the magnetic path forming portion 42 fixed to the fixed plate portion 433 and the middle joint portion 471 of the coupling body 45. The engagement plate portion 434 is formed with a hole 437 that penetrates in the thickness direction and allows the vibration body side shaft portion 461 of the coupling body 45 to pass therethrough.
The extending length of the engagement plate portion 434 extending from the connection plate portion 435 is suppressed to such an extent that the hole 437 through which the vibration body side shaft portion 461 is inserted can be formed. That is, the extending length of the engaging plate portion 434 is set shorter than the extending length of the fixed plate portion 433. For this reason, in this embodiment, as shown in FIGS. 11 and 12, a part of the leaf spring 476 of the midway joint portion 471 is viewed from the direction of the axis C2 (Z-axis direction) of the vibrating body side shaft portion 461. It protrudes in the extending direction of the engaging plate part 434 from the extending direction tip of the part 434.

By the way, in this embodiment, the damping member 491A fixed to the leaf spring 476 of the midway joint portion 471 is sandwiched between the leaf spring 476 and the engagement plate portion 434 (see FIGS. 4, 5, and 8). For this reason, in this embodiment, a sandwiching plate portion 438 (an example of a projecting portion) that extends further from the engagement plate portion 434 is formed at a part of the extending direction tip of the engagement plate portion 434. The sandwiching plate portion 438 is engaged with the leaf spring 476 of the midway joint portion 471 and the axis C2 direction (Z-axis direction) of the vibrating body side shaft portion 461 in the extending direction front end of the engagement plate portion 434. The plywood portion 434 protrudes from the front end in the extending direction. By forming the sandwiching plate portion 438, the damping member 491A can be sandwiched between the leaf spring 476 and the engaging plate portion 434 regardless of the circumferential position of the damping member 491A in the leaf spring 476. Become. It is preferable that the size of the holding plate portion 438 as viewed from the axis C2 direction (Z-axis direction) of the vibrating body side shaft portion 461 is minimized.

As shown in FIGS. 4, 5, and 8, the contact member 432 is formed in an annular shape, and is formed of a soft fiber member such as felt or cloth. The contact member 432 is fixed to the inner peripheral surface of the hole 437 of the engagement plate portion 434 by adhesion or the like. The contact member 432 functions as a bush that fills a gap between the hole 437 of the engagement plate portion 434 and the vibration body side shaft portion 461 inserted through the hole 437. That is, the contact member 432 contacts the portion of the vibrating body side shaft portion 461 located in the hole 437 of the engagement plate portion 434 and engages with the vibrating body side shaft portion 461.
As a result, the restriction holder portion 43 restricts the movement in the direction perpendicular to the axis C2 direction while allowing the vibration body side shaft portion 461 to move in the direction of the axis C2 at the position where the vibration body side shaft portion 461 is engaged. .

Next, a mounting structure for attaching the vibration exciter 40 having the above configuration to the above-described piano 1 will be described mainly with reference to FIGS.

As shown in FIGS. 1 to 4, the vibrator main body 41 of the vibrator 40 is fixed to the housing 11. When the vibrator main body 41 is fixed to the housing 11, the vibrator main body 41 is opposed to the lower surface 16 b of the soundboard 16 with a space therebetween, and the axis C <b> 2 of the magnetic path forming unit 42. Is parallel to a predetermined direction (Z-axis direction) orthogonal to the lower surface 16b of the soundboard 16.
In the present embodiment, the magnetic path forming part 42 is fixed to the housing 11 via the support part 50. The support portion 50 is fixed to the side surface (surface extending in the Z-axis direction) of the straight column 21 of the housing 11 and extends in a direction orthogonal to the predetermined direction (Z-axis direction) from the side surface of the straight column 21.

The support portion 50 of the present embodiment is formed by bending a plate member made of, for example, metal. As shown in FIGS. 3 to 5, the support portion 50 includes a positioning plate portion 51 disposed between the soundboard 16 and the vibrator main body 41, and a vertical lower side (Z-axis) from the periphery of the positioning plate portion 51. A surrounding plate portion 52 extending in the negative direction side and surrounding the side portion of the vibrator main body 41.
The positioning plate portion 51 is formed with an opening hole 53 that penetrates in the thickness direction and through which the coupling body 45 of the vibration exciter 40 is inserted. Further, the positioning plate portion 51 of the present embodiment is formed in a rectangular shape in plan view. For this reason, the surrounding plate portion 52 is constituted by four flat plate portions 54. One flat plate portion 54A (first flat plate portion 54A) is arranged on the side surface of the straight column 21 and fixed to the straight column 21 by screws or the like.

The vibrator main body 41 is fixed to the support portion 50 having the above configuration by screwing or the like. In addition, when the vibrator main body 41 is fixed to the support portion 50, the vibrator main body 41 is pressed against the positioning plate portion 51, whereby a predetermined direction of the vibrator main body 41 with respect to the housing 11 and the soundboard 16 ( Positioning in the Z-axis direction) is achieved. In the present embodiment, since the end surface of the vibrator main body 41 located on the sound board 16 side is composed of the engagement plate portion 434 of the restriction holder portion 43, the engagement plate portion 434 is pressed so as to overlap the lower surface of the positioning plate portion 51. .

Further, the positioning plate portion 51 and the engagement plate portion 434 have positioning means 70 for positioning the vibrator main body 41 with respect to the casing 11 and the soundboard 16 in a direction orthogonal to a predetermined direction (Z-axis direction). Is provided. The positioning means 70 in the illustrated example includes a plurality of positioning projections 71 formed on the positioning plate portion 51 and a plurality of positioning holes 72 formed on the engaging plate portion 434 and into which the plurality of positioning projections 71 are individually inserted. However, it is not limited to this.

As shown in FIGS. 1 and 4, the vibrating body 44 of the vibration exciter 40 is connected to the lower surface 16 b of the soundboard 16 via a connecting body 45. Here, the connection position of the connecting body 45 in the soundboard 16 may be set to a position where the soundboard 16 is sandwiched between the piece 35 disposed on the upper surface 16a of the soundboard 16, for example.
In this embodiment, as shown in FIGS. 4 and 10, the socket portion 483 of the retainer portion 482 constituting the tip joint portion 472 of the coupling body 45 is fixed to the lower surface 16 b of the soundboard 16. In the present embodiment, the interposition component 60 is provided between the socket portion 483 and the soundboard 16, and the socket portion 483 is fixed to the soundboard 16 via the interposition component 60.
The intervening component 60 is fixed to the soundboard 16 in an detachable manner by adhesion, and is detachably fixed to the connector 45. The interposition component 60 is formed in a plate shape, and is provided so that its thickness direction coincides with a predetermined direction (Z-axis direction).

As shown in FIG. 10, the interposition component 60 is formed with a positioning recess 63 </ b> A that is recessed from the first facing surface 61 that faces the socket portion 483 of the tip joint portion 472. The positioning recess 63 </ b> A of the present embodiment penetrates in the thickness direction of the interposed component 60. On the other hand, the socket 483 of the distal joint 472 is formed with a positioning projection 63B that protrudes toward the interposition component 60 and can be inserted in a predetermined direction (Z-axis direction) with respect to the positioning recess 63A. The positioning protrusion 63B is inserted into the positioning recess 63A without a gap. Accordingly, the socket portion 483 of the distal joint portion 472 that forms the distal end of the coupling body 45 is positioned with respect to the intervening component 60.
The configuration for positioning the socket portion 483 with respect to the interposed component 60 is not limited to the above. For example, the positioning concave portion may be formed in the socket portion 483 and the positioning protrusion may be formed in the interposed component 60.

The intervening component 60 is formed with a female screw hole 65A into which a screw 64 for fastening and fixing the socket portion 483 to the intervening component 60 is screwed. On the other hand, a screw insertion hole 65B through which the screw 64 is inserted is formed at the front end in the protruding direction of the screwing projection 483C of the socket 483.
When the socket portion 483 is fastened and fixed to the interposition component 60, the screw 64 is inserted through the exposed hole 488 of the leaf spring 484 of the tip joint portion 472 and the screw insertion hole 65B of the socket portion 483 in order, and then interposed. What is necessary is just to screw in 65 A of female screw holes of the components 60. FIG. Since the diameter dimension of the exposure hole 488 of the leaf spring 484 is larger than the diameter dimension of the head portion of the screw 64, the leaf spring 484 is not fastened and fixed to the socket portion 483 or the interposed component 60 by the screw 64.

Further, the insertion component 60 is formed with a screw insertion hole 67 through which a screw 66 for fastening and fixing this to the soundboard 16 is inserted. A plurality (three in the illustrated example) of the screw insertion holes 67 are arranged at intervals in the circumferential direction of the interposed component 60. When the interposition component 60 is fastened and fixed to the lower surface 16 b of the soundboard 16, the screw 66 is inserted into the screw insertion hole 67 from the first facing surface 61 side of the interposition component 60 and then screwed to the soundboard 16. Just do it.

Next, an example of an attachment method for attaching the vibrator 40 of the present embodiment to the piano 1 will be described.
When attaching the vibration exciter 40, first, an intervening component fixing step of fixing the intervening component 60 to the soundboard 16 is performed. In this step, the interposed component 60 is fixed by adhesion so that the first facing surface 61 of the interposed component 60 faces downward (Z-axis negative direction). Thereby, the interposition component 60 is fixed to the soundboard 16 so as not to be detached.
In the present embodiment, after the interposition component 60 is bonded and fixed to the soundboard 16, the screw 66 is inserted into the screw insertion hole 67 of the interposition component 60 and then screwed to the soundboard 16. Is fastened and fixed to the soundboard 16.

Further, before and after the intervening part fixing step described above, a supporting portion fixing step for fixing the supporting portion 50 to the housing 11 is performed. In the steps to be performed later of the intervening component fixing step and the support portion fixing step, it is preferable to perform relative positioning of the intervening component 60 and the support portion 50 using a jig (not shown). In particular, relative positioning of the interposed component 60 and the support portion 50 in a direction (X-axis direction and Y-axis direction in FIGS. 1 and 2) orthogonal to a predetermined direction (Z-axis direction) may be performed.

Then, the connection body fixing process which fixes the connection body 45 to the interposition component 60 is implemented. In this step, first, the retainer portion 482 of the distal joint portion 472 is disposed so as to overlap the first facing surface 61 of the interposed component 60. At this time, the retainer portion 482 is positioned with respect to the interposed component 60 by inserting the positioning protrusion 63B formed on the socket portion 483 of the retainer portion 482 into the positioning recess 63A of the interposed component 60. Next, the screw 64 is inserted into the screw insertion hole 65 </ b> B of the socket portion 483 and then screwed into the female screw hole 65 </ b> A of the interposed component 60. As a result, the retainer portion 482 of the distal joint portion 472 is fastened and fixed to the interposed component 60.
In a state after performing this process, the vibration body side shaft portion 461 of the coupling body 45 is inserted into the opening hole 53 of the positioning plate portion 51 of the support portion 50. Further, a damping member 491B fixed to the leaf spring 484 of the distal joint 472 is sandwiched between the leaf spring 484 and the intervening component 60 (or the soundboard 16).

After the coupling body fixing step, a main body fixing step for fixing the magnetic path forming portion 42 to the support portion 50 and fixing the vibrating body 44 to the coupling body 45 is performed.
In the main body fixing step, first, the vibrating body side shaft portion 461 of the coupling body 45 is inserted into the hole 437 of the engaging plate portion 434 of the frame portion 431 fixed integrally with the magnetic path forming portion 42 and the insertion hole 420 of the magnetic path forming portion 42. Then, it is inserted through the holes of the vibrating body 44 (cap 443) in the above order.

Next, the engagement plate portion 434 of the frame portion 431 is disposed so as to overlap the positioning plate portion 51 of the support portion 50. At this time, the plurality of positioning protrusions 71 formed on the positioning plate portion 51 are individually inserted into the plurality of positioning holes 72 formed on the engaging plate portion 434. Thereby, positioning of the magnetic path formation part 42 with respect to the housing | casing 11, the sound board 16, and the connection body 45 can be aimed at. Thereafter, the magnetic path forming part 42 is fixed to the support part 50 by fixing the frame part 431 to the support part 50 by screws or the like.
Finally, the end of the vibration body side shaft portion 461 is fixed to the vibration body 44 by the fixing means 440. In this state, the axis of the vibration body side shaft portion 461 coincides with the axis C1 of the vibration body 44.
Thus, the method for attaching the vibrator 40 is completed.

In the piano 1 to which the vibrator 40 is attached as described above, when the drive signal based on the audio signal is input to the voice coil 442 of the vibrator 40, the vibrating body 44 vibrates in a predetermined direction (Z-axis direction). . The vibration of the vibrating body 44 is transmitted to the soundboard 16 by the connecting body 45, and thereby the soundboard 16 vibrates in a predetermined direction. The vibration of the soundboard 16 propagates in the air and becomes sound.

Moreover, in the piano 1 of this embodiment to which the vibration exciter 40 is attached, when a displacement in a direction (orthogonal direction) orthogonal to a predetermined direction occurs in the soundboard 16 based on aging degradation or the like, the soundboard 16 is fixed. The interposed part 60 and the retainer part 482 of the tip joint part 472 are displaced in the orthogonal direction with respect to the magnetic path forming part 42 in the same manner as the soundboard 16.
Here, since the connecting body 45 of the present embodiment includes the midway joint portion 471 and the tip joint portion 472, when the interposition component 60 and the retainer portion 482 of the tip joint portion 472 are displaced in the orthogonal direction, the midway joint portion 471 and the tip joint are provided. By the portion 472, the axis C3 of the vibrating body side shaft portion 462 is inclined with respect to both the predetermined direction and the axis C2 of the magnetic path forming portion. For this reason, it can suppress that the axis line of the vibrating body 44 and the vibrating body side axial part 461 inclines with respect to a predetermined direction. That is, it is possible to prevent the axis C2 of the vibrating body 44 fixed to the vibrating body side shaft portion 461 from being inclined with respect to the axis C1 of the magnetic path forming portion 42 parallel to the predetermined direction.

As described above, according to the vibrator 40 of the present embodiment and the piano 1 including the same, the vibration damping member 491 is fixed to the leaf springs 476 and 484 of the midway joint portion 471 and the tip joint portion 472. The natural frequency of the system including the leaf springs 476 and 484 and the damping member 491 is changed from the natural frequency of the leaf springs 476 and 484. For this reason, it can suppress that the leaf | plate springs 476 and 484 of the midway joint part 471 and the front-end | tip joint part 472 are resonated by the vibration of the vibrating body 44.
In the present embodiment, the range of the frequency (frequency) for vibrating the soundboard 16 is limited to a range (audible range) suitable for generating sound. Therefore, the damping member 491 may be fixed to the leaf springs 476 and 484 so that the natural frequency of the system including the leaf springs 476 and 484 and the damping member 491 is out of the audible range.

Further, according to the vibrator 40 of the present embodiment, the damping member 491 is softer than the material of the leaf springs 476 and 484. For this reason, the natural frequency of the system including the leaf springs 476 and 484 and the damping member 491 can be made lower than the natural frequency of the leaf springs 476 and 484. Further, the spring constant of the damping member 491 is smaller than the spring constant of the leaf springs 476 and 484. Accordingly, when the vibrating body 44 vibrates, the damping member 491 is deformed (flexed) before the leaf springs 476 and 484, and the characteristics of the leaf springs 476 and 484 (for example, the spherical portions 473 and 481 are changed to the socket portions). The vibrations of the leaf springs 476 and 484 can be suitably damped while maintaining the characteristics of the leaf springs 476 and 484 that press against the 475 and 483.

Further, according to the vibrator 40 of the present embodiment, the damping member 491 is formed to be elastically deformable and is sandwiched between the leaf springs 476 and 484 and the vibrator main body 41 and the soundboard 16. . Thereby, even if the vibration of the vibrating body 44 is transmitted to the leaf springs 476 and 484, the damping member 491 provided between the leaf springs 476 and 484 and the vibrator main body 41 and the soundboard 16 is elastically deformed. Thus, vibrations of the leaf springs 476 and 484 can be suitably suppressed.

From the above, according to the vibrator 40 of the present embodiment and the piano 1 including the same, the sound generated by vibrating the soundboard 16 by the vibrator 40 can be suitably obtained.

As mentioned above, although this invention was demonstrated in detail, this invention is not limited to the said embodiment, A various change can be added in the range which does not deviate from the meaning of this invention.

For example, the damping member 491 fixed to the leaf springs 476 and 484 is formed in an annular shape in plan view corresponding to the outer peripheral portion (for example, the body plate portions 478 and 486) of the leaf springs 476 and 484, as shown in FIG. May be. In the illustrated example, the outer shape of the leaf spring in plan view is formed in a circular shape, and the damping member is formed in an annular shape corresponding to the outer peripheral portion of the leaf spring, but this is not restrictive. Moreover, the damping member 491 may be formed in a simple annular shape, for example. For example, as shown in FIG. 13, circumferential portions corresponding to the spring portions 479 and 487 of the annular vibration damping member 491 may protrude radially inward relative to other portions.
When the damping member 491 is formed in an annular shape, the damping member 491 can be provided with good balance in the entire circumferential direction with respect to the leaf springs 476 and 484 with only one damping member 491. That is, the damping member 491 can be easily provided for the leaf springs 476 and 484.

Further, for example, as shown in FIG. 14, the vibration damping member 491 may be provided at a position where the vibration damping member 491 is not sandwiched between the leaf spring 484 of the tip joint portion 472 and the soundboard 16. That is, the damping member 491 may be fixed to a surface of the leaf spring 484 facing the opposite side of the soundboard 16, for example. Similarly, the damping member 491 may be provided at a position that is not sandwiched between the leaf spring 476 of the midway joint portion 471 and the vibrator main body 41, for example.
Even in this case, as in the case of the above-described embodiment, the leaf springs 476 and 484 of the midway joint portion 471 and the tip joint portion 472 can be prevented from resonating due to the vibration of the vibrating body 44.

Further, the joint portion 47 of the coupling body 45 may be only one of the midway joint portion 471 and the tip joint portion 472, for example. For example, when the joint portion 47 is only the tip joint portion 472, the shaft portion 46 of the coupling body 45 may be formed so as to extend from the vibrating body 44 to the soundboard 16 as in the above embodiment. In this case, the tip joint portion 472 allows the entire shaft portion 46 to be inclined with respect to a predetermined direction (Z-axis direction).

Further, the magnetic path forming portion 42 is not limited to being fixed to the fixed plate portion 433 so that the vibrating body 44 is positioned on the fixed plate portion 433 side of the restriction holder portion 43 as in the above-described embodiment. 44 may be fixed to the fixed plate portion 433 so as to be positioned on the engagement plate portion 434 side of the restriction holder portion 43.

Further, the vibrator main body 41 of the vibrator 40 is not limited to the straight column 21 of the housing 11, and may be fixed to the bending side plate 19 or the bending column 20, for example.
Further, the vibrator main body 41 of the vibrator 40 may be directly fixed to the housing 11 without using the support portion 50, for example.

Moreover, in the said embodiment, although the sound board 16 was illustrated as a vibrating body which attaches the vibration exciter 40, other members of the housing | casing 11 which may produce the displacement accompanying aged deterioration etc. are used as a vibrating body, for example. I do not care.
Further, the vibrator 40 according to the present invention is, for example, a member in which the body to be shaken is not displaced, and the member of the housing 11 that fixes the magnetic path forming portion 42 is a member that can be displaced due to aging or the like. It can also be attached to other configurations.
The vibrator 40 according to the present invention can be applied to a musical instrument including a vibrating body such as the sound board 16, for example, other keyboard instruments such as an upright piano, stringed instruments such as an acoustic guitar, a violin, The present invention can be applied to various musical instruments such as percussion instruments such as drums and timpani, and electronic musical instruments such as electronic pianos.

DESCRIPTION OF SYMBOLS 1 ... Piano (musical instrument), 16 ... Sound board (vibrated body), 40 ... Exciter, 41 ... Exciter main body, 44 ... Vibrating body, 45 ... Connection body, 46 ... Shaft part, 461 ... Vibrating body side Shaft part, 462 ... Shaking body side shaft part, 47 ... Joint part, 471 ... Intermediate joint part, 472 ... Tip joint part, 473, 481 ... Spherical part, 474, 482 ... Retainer part, 475, 483 ... Socket part, 476, 484 ... leaf spring, 491, 491A, 491B ... damping member

Claims (10)

1. An exciter that generates sound by exciting a vibrating body in a first direction,
   An exciter body,
   A vibrator provided to vibrate in the first direction relative to the vibrator main body;
   Connecting the vibrating body and the excited body to each other, and transmitting a vibration of the vibrating body to the excited body,
   A shaft that extends between the vibrating body and the vibrating body; and a joint that allows at least a portion of the shaft to be inclined with respect to the first direction. With
   The joint portion includes a spherical portion, and a retainer portion that rotatably holds the spherical portion,
   The retainer portion includes a socket portion into which a part of the spherical portion is inserted, and a leaf spring that presses the spherical portion against the socket portion,
   A vibration exciter in which a damping member is fixed to the leaf spring.
2. 2. The vibration exciter according to claim 1, wherein the damping member is made of a material softer than the leaf spring.
3. The vibration damping member according to claim 1 or 2, wherein the vibration damping member is formed so as to be elastically deformable, and is sandwiched between the leaf spring and one of the vibrator main body and the body to be vibrated. Vibrator.
4. The leaf spring includes a main body plate portion and a plurality of spring portions protruding from the main body plate portion and arranged apart from each other in the circumferential direction of the spherical portion,
   3. The vibration exciter according to claim 1, wherein the vibration damping member is fixed to the main body plate portion.
5. 5. The vibration exciter according to claim 4, wherein a plurality of the damping members are arranged apart from each other in the circumferential direction corresponding to the plurality of spring portions.
6. The vibrator according to claim 4 or 5, wherein the damping member is fixed to a surface of the main body plate portion facing the vibrator main body.
7. The vibration exciter according to claim 6, wherein the vibration exciter main body includes a protruding portion that faces the main body plate portion and contacts the vibration damping member.
8. 6. The vibration exciter according to claim 4 or 5, wherein the vibration damping member is fixed to a surface of the main body plate portion that faces the excited body.
9. The outer shape of the leaf spring in plan view is formed in a circular shape or a polygonal shape centered on the axis of the shaft portion,
   The vibrator according to any one of claims 1 to 8, wherein the damping member is formed in a ring shape in plan view corresponding to an outer peripheral portion of the leaf spring.
10. A vibrator to be sounded by vibration in the first direction;
    A musical instrument comprising the vibration exciter according to any one of claims 1 to 9.
    

Images