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JP2017129694

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DESCRIPTION JP2017129694
Abstract: [Problem] To provide a vibrating device and a musical instrument capable of improving
the conversion efficiency for converting vibration due to vibration into acoustic radiation. An
oscillating device 61 is attached to an inner side surface 33A of a back plate 33 of a body of a
guitar. Each of the pair of support portions 62 and 63 of the vibration device 61 is attached to
each of the sound rods 55C and 55D which are likely to be nodes of the vibration generated on
the back plate 33. The exciter 67 of the exciter 61 is supported by the support portions 62 and
63 via the bracket 65, so that the displacement of the exciter 67 before and after the excitation
operation is suppressed. Further, in the vibrator 67, the position at which the vibration is
antinode is set as the vibration position P2. Thus, the vibrator 67 can efficiently convert the
vibration into acoustic radiation. [Selected figure] Figure 4
Musical instruments and excitation devices
[0001]
The present invention relates to an excitation apparatus for exciting a musical instrument, and an
instrument equipped with an oscillator.
[0002]
2. Description of the Related Art Conventionally, there are instruments that emit sound by
vibrating a soundboard or the like with a vibrator (for example, Patent Document 1).
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In the electric acoustic guitar (electric acoustic guitar) disclosed in Patent Document 1, a plurality
of vibrators are attached in a body. A pick-up provided at Eleako's bridge converts the vibration
of the string into an electrical signal and outputs it to an amplifier in the body. The amplifier
amplifies the input vibration and outputs it to the vibrator. The vibrator vibrates the front plate
of the body according to the signal input from the amplifier to emit sound from the front plate.
[0003]
Patent No. 3788382
[0004]
In an instrument equipped with the above-described vibrator, the efficiency of converting
vibration into acoustic radiation fluctuates significantly depending on the mounting position and
mounting structure of the vibrator.
For this reason, an excitation apparatus that can be attached in an optimal state, and a musical
instrument attached with the excitation apparatus are desired.
[0005]
This application is proposed in view of the above-mentioned subject, and it aims at providing an
oscillating device and a musical instrument which can improve conversion efficiency which
transforms vibration by excitation into acoustic radiation.
[0006]
The musical instrument according to the present application includes an acoustic unit that emits
sound in response to a vibration, a support unit provided to the acoustic unit and attached to a
portion serving as a node in the vibration generated in the acoustic unit, supported by the
support unit, and extending from the support unit And an exciter provided on the bracket to
vibrate the acoustic unit in accordance with an input acoustic signal, the exciter excites a position
that becomes an antinode of the vibration generated in the acoustic unit. It is characterized by
[0007]
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In the musical instrument, the support portion is attached to a node portion of the vibration
generated in the sound portion.
In an acoustic part such as a soundboard, for example, there is a portion where rigidity is
enhanced as compared with other portions by attaching a sound rod or the like.
This part is likely to be a node of vibration occurring in the acoustic part. In addition, the exciter
that vibrates the acoustic part is disposed with reference to a specific position or plane of the
acoustic part in a non-oscillated state, fixed at the initial position disposed, and before and after
the excitation operation and during the excitation operation It is preferable not to shift. The
reason for this is that when the vibrator deviates from the initial position before and after the
excitation operation, the accuracy and efficiency of converting the vibration into acoustic
radiation decrease. The support of the instrument is mounted at the "node" at the acoustic part
where the amplitude of the vibration is very small or preferably zero. The vibrator is supported
by the support portion via the bracket, so that displacement of the vibrator before and after the
vibration operation is suppressed. Furthermore, the exciter is provided to excite a position that is
the antinode of the vibration. This allows the exciter to efficiently convert vibrations into acoustic
radiation. In addition, the acoustic part can confirm the part used as a node for every frequency
of vibration by simulation etc. beforehand. In addition, it is assumed that a large number of
vibrations with different magnitudes of frequency exist in the acoustic part. In this case, as
vibration of an object for determining the position of a belly or a node, for example, it is
conceivable to generate a realistic bass by targeting vibration (such as bass) having a low
frequency. Alternatively, as the target vibration, it is conceivable to target vibration of a
frequency that matches the user's preference.
[0008]
Further, in the musical instrument according to the present application, the sound unit may have
a plate-like shape and have a sound bar provided on a plane, and the support may be attached to
the sound bar.
[0009]
The plate-like acoustic part increases the rigidity of the portion to which the sound bar is
attached.
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For this reason, the part to which the sounding bar is attached is likely to be a node of vibration
generated in the acoustic part. Therefore, in the musical instrument, by attaching the support
portion to the sounding rod having a high possibility of becoming the position of the node, it is
possible to more surely enhance the conversion efficiency of the vibration into the acoustic
radiation.
[0010]
In the musical instrument according to the present invention, the musical instrument further
comprises a pair of support portions, the pair of support portions being attached to each of the
two sound rods, and the bracket being connected to each of the pair of support portions; A
bridge is provided between them, and the exciter may be configured to excite the position
between the two sound rods in the acoustic part.
[0011]
Here, the acoustic part formed of wood etc. may generate a warp due to the change over time.
In this case, the position of the sound bar is displaced in accordance with the warp of the
acoustic part. As a result, in the vibrator, the relative position with the acoustic unit, more
specifically, the excitation position in contact with the acoustic unit may be shifted, and the
conversion efficiency of the vibration into acoustic radiation may be reduced. On the other hand,
in the musical instrument, the brackets are bridged by a pair of supports attached to each of the
two sound rods. In such a configuration, it is possible to suppress displacement of the excitation
position by deforming the support portion in accordance with the warp of the acoustic portion.
As a result, the instrument can suppress the reduction of the conversion efficiency of acoustic
radiation when used for a long time.
[0012]
Further, in the musical instrument according to the present application, the two sounding bars
are arranged adjacent to each other along the plane of the sound unit, and the exciter excites the
sounding unit at a position intermediate between the two adjacent sounding bars. It may be a
configuration.
[0013]
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The location where the sounding bar is attached is likely to be a node of vibration due to the
increase in rigidity.
Therefore, the position between the two adjacent sound rods is likely to be the antinode of the
vibration. Therefore, the vibrator of the musical instrument can more reliably enhance the
conversion efficiency of the vibration into the acoustic radiation by vibrating the intermediate
position of the adjacent sounding bars.
[0014]
Further, in the musical instrument according to the present invention, the vibrator includes a
vibrating portion that vibrates according to an acoustic signal, and a cap portion provided
between the vibrating portion and the acoustic portion to vibrate together with the vibrating
portion to transmit the vibration to the acoustic portion. The cap portion may have a first tapered
portion that tapers from the vibrating portion side toward the acoustic portion side.
[0015]
The vibrating portion of the vibrator includes, for example, a coil, a magnet, and the like, and has
a certain size.
For this reason, the cap part attached to a vibration part also needs a certain size. On the other
hand, strictly speaking, the antinode position of the vibration of the specific frequency is one
point in the acoustic part. For this reason, it is ideal that the excitation position for exciting the
acoustic part by the exciter be this one point. Therefore, in the musical instrument, by providing
the first tapered portion in the cap portion, the excitation position at which the cap portion and
the acoustic portion come in contact can be narrowed as much as possible to one point serving
as the antinode of the vibration. In addition, the cap portion has the first taper portion, so that
the excitation position can be separated as much as possible from the position of the support
portion which becomes a node. For example, the conversion efficiency of acoustic radiation can
be improved by moving the excitation position away from the position of high rigidity in the
acoustic unit (the position where the sounding bar is provided).
[0016]
Further, in the musical instrument according to the present application, the cap portion may have
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a pressing portion for pressing the cap portion to the side of the acoustic portion when
adhesively fixed to the acoustic portion.
[0017]
In this musical instrument, for example, when bonding the first tapered portion of the cap
portion to the acoustic portion, the operator presses the pressing portion with his hand to easily
and reliably fix the first tapered portion to the acoustic portion. can do.
[0018]
Further, in the musical instrument according to the present application, the support portion may
have a second tapered portion which is tapered from the bracket side toward the acoustic
portion side.
[0019]
The vibrator is fixed with reference to a specific position or surface of the acoustic part in a nonoscillated state.
In the support portion of the musical instrument, for example, by attaching the tip of the second
tapered portion in contact with the acoustic portion, the support portion can be easily positioned
in the operation of attaching the support portion to the acoustic portion.
[0020]
Further, in the musical instrument according to the present application, the support portion may
have a plurality of second tapered portions, and may be in contact with the acoustic portion at
three or more support points that are not on a straight line.
[0021]
The support portion is in contact with the acoustic portion by three or more support points
which are not on a straight line, and a plane is determined by these three points, which makes it
possible to keep the distance between the bracket and the acoustic portion constant.
[0022]
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The invention in the present application is not limited to a musical instrument having an exciter,
and can be embodied as an exciter for exciting a sound unit.
[0023]
According to the musical instrument and the excitation apparatus according to the present
application, it is possible to improve the conversion efficiency of converting vibration into
acoustic radiation.
[0024]
It is a top view of the guitar concerning an embodiment.
It is a top view which shows the inner part of the back plate of a body.
It is an enlarged view of the part which attached the excitation apparatus.
It is a side view of an excitation apparatus.
It is sectional drawing cut | disconnected by the AA shown in FIG.
It is the side view which looked at a support part and a sound stick from the front side.
It is the figure which showed the cross section of the exciter typically. It is a schematic diagram
which shows the state before curvature generate | occur | produces in a back plate. It is a
schematic diagram which shows the state which the upward curvature generate | occur |
produced in the back plate. It is a schematic diagram which shows the state which the downward
curvature generate | occur | produced in the back plate. It is a top view which shows the inner
part of the back plate of another example. It is a top view of another example guitar. It is a side
view of an excitation apparatus of another example.
[0025]
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Hereinafter, the guitar 10 shown in FIG. 1 will be described as an embodiment embodying the
musical instrument of the present application. FIG. 1 shows a plan view of the guitar 10. FIG. 2
shows the inside of the back plate 33 of the body 11. The guitar 10 is a so-called acoustic guitar,
and comprises a body 11, a neck 13 connected to the body 11, and a head 15 attached to the tip
of the neck 13.
[0026]
The neck 13 is in the form of a bar extending in one direction, and its proximal end is fixed to the
body 11. Mounted on the neck 13 is a fingerboard 23 having a plurality of frets 21. In the
following description, as shown in FIG. 1 and FIG. 2, the front end side (head 15 side) of the neck
13 is forward, the base end side (body 11 side) of the neck 13 is rear, The direction substantially
parallel to the surface of the body 11 is referred to as the left-right direction, and the direction
orthogonal to the front-rear direction and the left-right direction is referred to as the up-down
direction. In this case, the extension direction of the neck 13 is parallel to the front-rear direction.
[0027]
As shown in FIGS. 1 and 2, the body 11 is configured as a hollow box-shaped resonance box
having a front plate 31, a back plate 33, and a side plate 35. The body 11 has a predetermined
thickness in the vertical direction, and a constricted portion which is curved at a predetermined
angle in the lateral direction as it goes from the front to the rear is formed. As a material of the
body 11, for example, wood such as spruce, cedar, rosewood, mahogany can be used.
[0028]
The heel (not shown) at the rear end of the neck 13 is fixed to the neck block 37 provided at the
front end of the body 11 by adhesion or a bolt or the like. Further, six strings 25 are stretched in
the guitar 10 of the present embodiment. Each string 25 is stretched between a head 15
provided at the tip of the neck 13 and a bridge 39 attached to the front plate 31 of the body 11.
Each string 25 can be tuned by changing the tension applied by turning a peg 15A provided on
the head 15.
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[0029]
The bridge 39 is provided with a saddle 41 for supporting the strings 25 from below and
maintaining the height of the neck 13 relative to the fingerboard 23. The vibration of the strings
25 is transmitted to the body 11 via the saddle 41 and a bridge 39 supporting the saddle 41. On
the front plate 31 of the body 11, a sound hole 43 is formed at a position behind the neck 13 to
emit the sound resonating in the internal space of the body 11 to the outside.
[0030]
The back plate 33 has substantially the same shape as the top plate 31 when viewed in the
vertical direction. The side plate 35 is formed along the curved outer peripheral portion of the
front plate 31 and the back plate 33, and connects the front plate 31 and the back plate 33 in
the vertical direction. An end block 45 is provided at the rear end of the back plate 33. The neck
block 37 and the end block 45 firmly fix each of the front plate 31, the back plate 33 and the
side plate 35 to each other, and function as a reinforcing member that enhances the rigidity of
the body 11 against the tension of the strings 25.
[0031]
As shown in FIG. 2, a peel-off stop 53 and four sounding bars 55A, 55B, 55C, 55D are attached to
the inner side surface 33A of the back plate 33. As shown in FIG. The peel-offs 53 and the sound
rods 55A to 55D are fixed at predetermined positions, for example, by adhesion to the inner side
surface 33A. As an adhesive for fixing the peel-off stopper 53 and the sound rods 55A to 55D,
for example, glue having high adhesive strength and good sound can be used. The shapes,
numbers, positions and the like of the barbs 53 and the sound rods 55A to 55D shown in FIG. 2
are merely examples, and the positions and the like are appropriately changed according to the
purpose of enhancing the rigidity and the purpose of adjusting the timbre. Ru.
[0032]
The peel-off stopper 53 has a plate shape standing on the inner side surface 33A, is provided at
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the center of the back plate 33 in the left-right direction, and is arranged on the inner side
surface 33A along the front-rear direction. The peel-off stop 53 prevents the peeling off of the
adhesion of the back plate 33 configured by bonding the two plates at the center in the left-right
direction. Each of the four sounding bars 55A to 55D is disposed at a predetermined interval in
the front-rear direction and is disposed on the inner side surface 33A along the left-right
direction. A vibrating device 61 is attached to the two sound rods 55C and 55D on the rear side
among the four sound rods 55A to 55D. The vibrating device 61 is attached to the left side of the
peel-off 53. In addition, the attachment position of the vibration excitation apparatus 61 can be
suitably changed according to the position of the bar stop 53 and sound stick 55A-55D.
[0033]
The excitation device 61 includes a pair of support portions 62 and 63, a bracket 65, and an
oscillator 67. FIG. 3 shows an enlarged view of a portion of the back plate 33 to which the
vibration device 61 is attached. FIG. 4 shows a side view of the excitation device 61. As shown in
FIG. As shown in FIG. 3 and FIG. 4, the support portion 62 is attached to the front side sound bar
55C. Moreover, the support part 63 is attached to the sound stick 55D on the rear side. In
addition, since the support parts 62 and 63 of this embodiment become the mutually same
structure, it demonstrates about the common part mainly using the support part 62, and
abbreviate | omits the description of the support part 63 suitably.
[0034]
The support portion 62 is formed, for example, by bending a metal plate material, and includes a
front side plate 62A, a rear side plate 62B, and an upper side plate 62C connecting the front side
plate 62A and the rear side plate 62B. The support portion 62 is substantially U-shaped having
an opening at the lower side when viewed in the left-right direction, and extends along the leftright direction. The distance between the front side plate 62A and the rear side plate 62B in the
front-rear direction is a length corresponding to the thickness in the front-rear direction of the
sound bar 55C.
[0035]
FIG. 5 is a view of the support portion 62 and the sound rod 55C as viewed from the rear side
plate 62B side (rear side) by cutting along the line AA shown in FIG. As shown in FIG. 5, the rear
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side plate 62B is in point contact with the back plate 33 only at one support point P1. More
specifically, as shown in FIGS. 3 and 4, the sound rod 55C has a substantially plate shape long in
the vertical and horizontal directions, and stands up with the lower end surface fixed to the inner
side surface 33A of the back plate 33. It is set up. As shown in FIG. 5, the rear side plate 62B
extends in the vertical direction along the rear side surface of the sound rod 55C, and has a plate
shape extending in the left-right direction. In the rear side plate 62B, a long through hole 71 in
the left-right direction is formed at an upper portion which is a connection portion with the
upper side plate 62C. The through hole 71 is formed at the center in the left-right direction of
the rear side plate 62B. The rear side plate 62 </ b> B is connected to the upper side plate 62 </
b> C by a pair of connecting portions 73 facing each other with the through hole 71 interposed
therebetween in the left-right direction. For this reason, the rear side plate 62B has a
substantially U-shape with the lower portion as the bottom when viewed from the rear side.
[0036]
In the rear side plate 62B, contact portions 75 are formed at the center in the left-right direction
and at the lower end. The contact portion 75 protrudes downward from the lower side edge
(bottom of the U-shape) of the rear side plate 62B, and a tapered portion 75A is formed to be
tapered by decreasing the width in the left-right direction as it goes downward. ing. The rear side
plate 62B makes point contact with only the protruding end of the contact portion 75 at the
support point P1 to the inner side surface 33A, and separates the other portion from the back
plate 33 in the vertical direction by the distance L1. It is fixed. The support point P1 is the same
position in the left-right direction as an excitation position P2 (see FIG. 4) which is the center of
the contact portion between the exciter 67 and the back plate 33 described later.
[0037]
FIG. 6 is a view of the support portion 62 and the sound stick 55C as viewed from the front side
plate 62A side (front side). As shown in FIG. 6, the front side plate 62A is composed of two plate
members, a first front plate 78 provided on the right side and a second front plate 79 provided
on the left side. As shown in FIG. 6, each of the first and second front plates 78, 79 has a plate
shape extending vertically, along the front side face of the sound rod 55C, if the width in the leftright direction is constant. There is. Each of the first and second front plates 78 and 79 has a
substantially rectangular shape that is long in the vertical direction when viewed from the front
side. In each of the first and second front plates 78 and 79, through holes 78A and 79A each
having an elliptical shape that is long in the vertical direction are respectively formed. The upper
end of each of the first and second front plates 78, 79 is connected to the upper plate 62C.
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[0038]
In the first front plate 78, a contact portion 78B is formed at the center in the left-right direction
and at the lower end. The contact portion 78B protrudes downward from the lower portion of the
first front plate 78, and has a tapered portion 78C which is tapered by reducing the width in the
left-right direction as it goes downward. Similarly, in the second front plate 79, a contact portion
79B is formed at the center in the left-right direction and at the lower end. The contact portion
79B protrudes downward from the lower portion of the second front plate 79, and a tapered
portion 79C is formed to be tapered by reducing the width in the left-right direction as it goes
downward. Each of the contact portions 78B and 79B is inclined rearward as going from the
lower side to the upper side (see FIG. 4).
[0039]
The first front plate 78 is fixed to the sounding rod 55C in a state in which only the protruding
end of the contact portion 78B is point-contacted with the inner side surface 33A at the support
point P3 and the other portion is vertically separated from the back plate 33. It is done. Similarly,
in the second front plate 79, only the protruding end of the contact portion 79B is pointcontacted with the inner side surface 33A at the support point P4, and the other portion is
separated from the back plate 33 in the vertical direction. It is fixed to 55C. The support point P1
of the rear side plate 62B is not located on the straight line connecting the support points P3 and
P4. Therefore, the support portion 62 contacts the inner side surface 33A by three points which
are not in a straight line, and a plane is determined by these three points, and the height H1 (see
FIG. 4) of the back plate 33 and the upper plate 62C is kept constant. ing.
[0040]
As shown in FIG. 4, the support portion 62 sandwiches the sounding rod 55C by the front side
plate 62A and the rear side plate 62B in a state where the sounding rod 55C is inserted from
below between the front side plate 62A and the rear side plate 62B. doing. The support portion
62 is fixed to the sounding rod 55C, for example, by bonding while holding the sounding rod
55C.
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[0041]
As shown in FIGS. 3 and 4, the upper side plate 62C of the support portion 62 connects the
upper ends of the front side plate 62A and the rear side plate 62B to each other. The upper side
plate 62C has a flat plate shape, and when viewed from the up and down direction, has a
substantially rectangular shape long in the left and right direction. Further, the upper end portion
of the sound rod 55C is in the shape of a circular arc curved at a predetermined angle (see FIG.
4). A predetermined gap 77 is formed between the upper side plate 62C and the upper end of the
sound bar 55C in the vertical direction (see FIG. 4). A front end portion 65A of the bracket 65 is
fixed to a central portion in the left-right direction of the upper side plate 62C.
[0042]
The bracket 65 is a flat metal member and extends in the front-rear direction. The shape and
material of the bracket 65 are selected so as to be higher in rigidity than the support portions 62
and 63. The bracket 65 is bridged between the two sounding bars 55C and 55D by being
supported by the pair of support portions 62 and 63. The width of the bracket 65 in the left-right
direction is such that the central portion 65D in the front-rear direction is larger than the other
portions. The front end portion 65A of the bracket 65 is fixed to the upper side plate 62C by two
screws 81 and one hexagonal hole bolt 82 which are vertically inserted while being
superimposed on the upper side plate 62C of the support portion 62. There is. The screw 81 and
the hexagon socket head cap screw 82 are screwed into a threaded portion provided on the
upper side plate 62C. The method of fixing the bracket 65 to the support portion 62 is not
limited to this. For example, the bracket 65 may be fixed to the upper side plate 62C only with
the hexagonal socket bolt 82. In this case, a hole for inserting the screw 81 (a hole not provided
with the threaded portion) may be formed in the support portion 62, and the two screws 81 may
be used only for positioning the bracket 65 with respect to the upper plate 62C. .
[0043]
The rear side support portion 63 has the same configuration as the front side support portion
62, and includes a front side plate 63A, a rear side plate 63B, and an upper side plate 63C. The
support portion 63 is substantially U-shaped having an opening at the bottom when viewed from
the left and right direction, and is a back plate only with three contact points (see the support
point P1 in FIG. It is configured to be in point contact with 33. The contact point corresponding
to the support point P1 in the support portion 63 is also the same position in the left-right
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direction as the excitation position P2 (see FIG. 4) of the exciter 67 and the back plate 33
described later.
[0044]
The support portion 63 is fixed by sandwiching the sound rod 55D from both sides in the frontrear direction by the front side plate 63A and the rear side plate 63B. The upper end plate 63C of
the support portion 63 has a rear end 65B of the bracket 65 fixed at the center in the left-right
direction. The bracket 65 is supported by the support portion 62 and the support portion 63,
and is thus held at a position spaced upward from the inner side surface 33A of the back plate
33 by a predetermined height H1 (see FIG. 4).
[0045]
The rear end portion 65B of the bracket 65 is fixed to the upper side plate 63C by a single
hexagonal socket bolt 83 in a state of being superimposed on the upper side plate 63C of the
support portion 63. The hexagonal socket bolt 83 is screwed into a threaded portion provided on
the upper side plate 63C.
[0046]
Further, in the rear end portion 65B, a groove portion 65C cut out toward the front from the rear
end is formed. The groove 65 </ b> C is formed to have a width corresponding to the thickness
of the body of the hexagonal socket bolt 83. The hexagonal socket bolt 83 inserts the body into
the groove 65C and engages the head. The bracket 65 is slidable in the front-rear direction with
the hexagonal socket bolt 83 inserted in the groove 65C. Thus, the bracket 65 can be fixed to the
support portion 63 by tightening the hexagonal holed bolt 83 after adjusting the position in the
front-rear direction.
[0047]
A vibrator 67 is attached to a central portion 65D of the bracket 65. FIG. 7 schematically shows a
cross-sectional view of the vibrator 67. As shown in FIG. As shown in FIGS. 4 and 7, the yoke 91
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of the exciter 67 is formed to cover the top of the exciter 67. A part of the yoke 91 is inserted
into the mounting hole formed in the central portion 65D of the bracket 65 from below. The
yoke 91 is, for example, adhesively fixed to the central portion 65D. The yoke 91 is also fixed to
the bracket 65 by a screw 85 in the inserted state. In addition, the fixing method of the bracket
65 and the vibrator 67 can be changed suitably. In the vibrator 67, a voice coil 95 is wound
around a coil bobbin 93. At the upper part of the exciter 67, a magnet 97 and a cancel magnet
98, which have mutually opposing polarities facing each other, are provided to face each other in
the vertical direction. The voice coil 95 is provided between the two magnets 97 and the cancel
magnet 98 so as to interlink magnetic flux. For example, a neodymium magnet can be used as the
magnet 97 and the cancel magnet 98.
[0048]
Further, the spring 101 of the vibrator 67 holds the coil bobbin 93 so as to be able to vibrate in
the vertical direction with respect to the yoke 91. Thus, the coil bobbin 93 can vibrate in the
vertical direction with respect to the bracket 65 via the spring 101 and the yoke 91. In the
vibrator 67, when a current flows through the voice coil 95, the coil bobbin 93 and the voice coil
95 vibrate in the vertical direction. A cap portion 103 is attached to the lower end portion of the
coil bobbin 93. The cap portion 103 vibrates in the vertical direction together with the coil
bobbin 93.
[0049]
The cap portion 103 has a substantially conical shape whose diameter decreases from the upper
side to the lower side. The cap portion 103 is formed with a tapered portion 104 which tapers
downward from above. At the lower end of the cap portion 103, a disc-shaped tip portion 103A
is formed. The lower surface of the tip portion 103A is fixed in a state of being in contact with
the inner side surface 33A of the back plate 33. The tip end portion 103A is fixed to the inner
side surface 33A by adhesion, for example. The center of the circular lower surface of the tip
portion 103A is the above-described excitation position P2 (see FIG. 4).
[0050]
Further, as shown in FIG. 1, an input unit 47 for connecting to an external sound source is
provided on the rear side portion of the side plate 35. The acoustic signal input from the input
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unit 47 is amplified by the amplification unit 49 in the body 11 and is input to the vibration
exciter 67 of the vibration excitation apparatus 61 via the acoustic cable 105 (see FIG. 2). The
exciter 67 inputs a current corresponding to the acoustic signal to the voice coil 95 (see FIG. 3).
The coil bobbin 93 and the cap portion 103 oscillate in a reciprocating motion in the vertical
direction when a current is input to the voice coil 95. The back plate 33 vibrates together with
the cap portion 103 and converts the vibration of the vibrator 67 into acoustic radiation.
[0051]
Here, by attaching the peel-off stopper 53 and the sound rods 55A to 55D as the reinforcing
members, the portion of the back plate 33 provided with the sound rods 55A and the like has
higher rigidity than the other portions. Therefore, for example, the connection portion between
the sounding rod 55C and the back plate 33 shown in FIG. 4 is likely to be a node of vibration
generated in the back plate 33. The support parts 62 and 63 are attached to each of the sound
rods 55C and 55D which become this node.
[0052]
On the other hand, the positions further away from the peel stop 53 and the sound rods 55A to
55D are likely to be antinodes of vibration due to the decrease in rigidity. Therefore, the exciter
67 of the present embodiment is installed such that the intermediate position in the front-rear
direction of the sound rods 55C and 55D is the excitation position P2. In this case, the distance
L2 between the sounding rod 55C and the excitation position P2 corresponds to, for example, an
odd multiple of 1⁄4 of the target vibration cycle, that is, an antinode position. In addition, the
position of the back of the back plate 33 can be set in advance by carrying out simulation and
analyzing actual acoustic radiation and the like. In this case, the above-described distance L2 may
be adjusted to a more optimal distance. In the vibrator 67 having such a configuration, the
vibration is made more efficient by supporting the support portions 62 and 63 provided at the
positions where the nodes are difficult to vibrate and setting the positions where the antinodes
should be vibrated as the vibration position P2. It is possible to convert well into acoustic
radiation.
[0053]
Further, in the cap portion 103, a pressing portion 103B is formed extending outward from each
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outer peripheral surface in the front-rear direction. The pair of pressing portions 103B is formed
in a plate shape. On the upper surface of the pressing portion 103B, a plane is formed along the
front-rear direction and the left-right direction. Further, as shown in FIG. 3, through holes 65 </
b> E are formed in the bracket 65 in accordance with the position and size of the pressing
portion 103 </ b> B. Thereby, for example, when bonding the exciter 67 to the back plate 33 in
the assembling process of the guitar 10, the operator inserts a finger or a tool from the through
hole 65E, and the back plate 33 from the upper side of the two pressing portions 103B. By
pressing to the side, the tip portion 103A can be firmly fixed to the inner side surface 33A.
[0054]
Incidentally, in the above embodiment, the back plate 33 is an example of a sound unit. The voice
coil 95 and the coil bobbin 93 are an example of a vibration unit. The tapered portion 104 is an
example of a first tapered portion. The tapered portions 75A, 78C, 79C are an example of a
second tapered portion.
[0055]
As mentioned above, according to the above-mentioned embodiment, the following effects are
produced. <Effect 1> Each of the pair of support portions 62, 63 of the vibration exciter 61 is
attached to the sound rods 55C, 55D which are likely to be nodes of the vibration generated in
the back plate 33. The exciter 67 of the exciter 61 is supported by the support portions 62 and
63 via the bracket 65, so that the displacement of the exciter 67 before and after the excitation
operation is suppressed. Further, in the vibrator 67, the position at which the vibration is
antinode is set as the vibration position P2 (see FIG. 4). Thus, the vibrator 67 can efficiently
convert the vibration into acoustic radiation.
[0056]
<Effect 2> In addition, each of the support portions 62 and 63 is attached to the sound rods 55C
and 55D for increasing the rigidity of the back plate 33. The portion of the back plate 33
provided with the sound rods 55C and 55D has high rigidity and is likely to be a node of
vibration. For this reason, in the excitation device 61 of the present embodiment, by attaching
the support portions 62 and 63 to the sound rods 55C and 55D, it is possible to more reliably
enhance the conversion efficiency of the vibration into acoustic radiation.
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[0057]
<Effect 3> Further, the bracket 65 is supported by the pair of support portions 62 and 63, and is
provided in a bridge-like manner between the two sound rods 55C and 55D. The exciter 67
brings the tip end portion 103A of the cap portion 103 into contact with the back plate 33 at the
excitation position P2. Thus, even if downward or upward warping in FIG. 4 occurs in the back
plate 33 due to aging, the support portions 62 and 63 are displaced together with the sound rods
55C and 55D.
[0058]
FIG. 8 schematically shows the bracket 65, the support portion 62, the back plate 33, and the
like of the present embodiment, and shows a state in which no warpage occurs in the back plate
33. As shown in FIG. FIG. 9 shows a state in which the back plate 33 is warped upward. FIG. 10
shows a state in which the back plate 33 is warped downward. 8-10, illustration of the exciter 67
is abbreviate | omitted, in order to avoid that a drawing becomes complicated.
[0059]
The rigidity of the bracket 65 of the present embodiment is higher than that of the support
portions 62 and 63. Therefore, as shown in FIG. 9 and FIG. 10, if warpage occurs in the back
plate 33, the support portions 62 and 63 will bend in accordance with the warpage. On the other
hand, the bracket 65 having increased rigidity is supported by the easily bendable support
portions 62 and 63 and remains horizontal as in FIG. 8 before the occurrence of warpage. As a
result, when the distance between the support portions 62 and 63 is L5, the excitation position
P2 is maintained at a distance of (L5 / 2) from the support portion 63, that is, a distance L2. The
excitation position P2 is always the position of the apex (inflection point) of the back plate 33
that is deformed. Therefore, in the guitar 10 according to the present embodiment, the support
portions 62 and 63 are deformed in accordance with the warpage of the back plate 33, whereby
the displacement of the excitation position P2 can be suppressed. As a result, the guitar 10 of the
present embodiment can suppress the reduction of the conversion efficiency of acoustic radiation
when used for a long time.
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[0060]
<Effect 4> Further, the excitation device 61 is fixed to the sound rods 55C and 55D adjacent in
the front-rear direction, and the intermediate position in the front-rear direction of the sound
rods 55C and 55D is set as the excitation position P2. An intermediate position between the two
sounding bars 55C and 55D which are likely to be adjacent and to be a node of vibration is likely
to be an antinode of vibration. For this reason, in the guitar 10, it is possible to more reliably
enhance the conversion efficiency of the vibration into the acoustic radiation by vibrating the
intermediate position of the adjacent sound rods 55C and 55D.
[0061]
<Effect 5> In addition, the excitation device 61 vibrates the coil bobbin 93 and the cap portion
103 in the vertical direction by inputting a current according to an acoustic signal input from the
outside to the voice coil 95. The cap portion 103 is formed with a tapered portion 104 (an
example of a first tapered portion) that tapers downward from above. In the vibration excitation
device 61 of the present embodiment, by providing the tapered portion 104 in the cap portion
103, the vibration excitation position P2 at which the cap portion 103 and the back plate 33
contact is narrowed as much as possible to one point serving as an antinode of vibration. it can.
[0062]
In addition, if the back plate 33 is separated from the position of high rigidity where the sound
rods 55C and 55D are provided, the rigidity is reduced and it becomes easy to vibrate. The cap
portion 103 has the tapered portion 104, so that the excitation position P2 can be kept away
from the position of the highly rigid support portions 62 and 63 along the longitudinal direction
as much as possible. Thereby, the conversion efficiency of acoustic radiation can be improved.
[0063]
<Effect 6> Further, the cap portion 103 is formed with a pressing portion 103B extending
outward from each outer peripheral surface in the front-rear direction. Further, through holes
65E are formed in the bracket 65 in accordance with the position and size of the pressing
portions 103B. Thereby, when bonding the exciter 67 to the back plate 33, an operator who
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assembles the guitar 10 inserts a finger and a tool from the through hole 65E, and the two
pressing portions 103B from the upper side to the back plate 33 side. By pressing, the tip portion
103A can be firmly fixed to the inner side surface 33A. Then, when vibrating the vibrator 67 in
the vertical direction, not only the operation of pushing the back plate 33 downward by the cap
portion 103, but also the operation of pulling the back plate 33 upward can be favorably
performed. As a result, the vibrator 67 can efficiently transmit the vibration to the back plate 33.
[0064]
<Effect 7> The support portion 62 is formed with tapered portions 75A, 78C, 79C (an example of
a second tapered portion) which are tapered (see FIG. 5). The rear side plate 62B makes point
contact with only the protruding end of the contact portion 75 at the support point P1 to the
inner side surface 33A, and separates the other portion from the back plate 33 in the vertical
direction by the distance L1. It is fixed. The front side plate 62A is in point contact with the inner
side surface 33A at the support points P3 and P4 and is fixed to the sounding rod 55C in a state
where the other portion is vertically separated from the back plate 33. Therefore, the support
portion 62 is in contact with the back plate 33 at the three contact points (support points P1, P3,
P4). Moreover, the support part 63 by the side of a back has a taper part (not shown) similarly to
the support part 62 by the side of a front, and is contacting with the back plate 33 by three
points. Thereby, in the support portions 62 and 63 of the present embodiment, by attaching the
tapered portions 75A, 78C and 79C in a state in which the tapered portions 75A, 78C and 79C
are in contact with the back plate 33, mounting work of the support portions 62 and 63 to the
sound rods 55C and 55D. Positioning can easily be performed. In addition, the support portions
62 and 63 contact the inner side surface 33A by three points that are not in a straight line, and
the three points determine the plane, and the height H1 of the back plate 33 and the upper side
plates 62C and 63C (see FIG. 4) Can be kept constant.
[0065]
<Effect 8> The pair of support portions 62, 63 is fixed in a state of holding each of the sound
rods 55C, 55D. In such a configuration, the vibration exciter 61 can be attached to the guitar 10
later without applying special processing to the body 11 of the guitar 10. Specifically, the user
can insert the vibrating device 61 from the sound hole 43 and attach the vibrating device 61 to
the desired sound rods 55A to 55D.
[0066]
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The present invention is not limited to the above embodiment, and it goes without saying that
various improvements and changes can be made without departing from the spirit of the present
invention. For example, in the above embodiment, the guitar 10 is configured to include one
excitation device 61, but may be configured to include a plurality of excitation devices 61. In the
following description, the same components as those in the above embodiment are given the
same reference numerals, and the description thereof will be omitted as appropriate. FIG. 11
shows the inner side surface 33A of the back plate 33 of another example. For example, as
shown in FIG. 11, the guitar 10 may be provided with three excitation devices 61A, 61B, 61C.
These three vibration devices 61A to 61C are provided, for example, at positions that become
antinodes of vibrations of different magnitudes of frequency (high tone, middle tone, low tone,
etc.) among the vibrations generated on the back plate 33. . Thus, the excitation devices 61A to
61C can emit sound from the back plate 33 according to each frequency.
[0067]
Moreover, the position where the vibration excitation apparatus 61 of the said embodiment was
attached is an example, and can be changed suitably. For example, the support portions 62 and
63 of the excitation device 61A shown in FIG. 11 are attached to the adjacent sound rods 55B
and 55D with the sound rod 55C interposed therebetween in the front-rear direction. Moreover,
the rigidity of the part which attached the neck block 37 and the end block 45 becomes high
similarly to the part to which the backboard 33 attached sound-bar 55A-55D. Therefore, the
portion attached with the neck block 37 and the end block 45 is likely to be a node of vibration.
For example, the excitation device 61B is attached to the end block 45. The excitation device 61
</ b> B sandwiches the side surface of the end block 45 in the left-right direction by the support
portion 109, and is supported by only the end block 45.
[0068]
Also, for example, the vibration exciter 61C is attached to the neck block 37 and the sound rod
55A. The excitation device 61C is supported by a support portion 110 that holds the neck block
37 in the left-right direction, and a support portion 63 that holds the sound bar 55A. The neck
block 37 and the end block 45 may have a projection or the like for attaching the support
portions 109 and 110. Further, for example, the excitation device 61C arranges a bracket 65 so
as to function as a stick for each of the side surfaces of the neck block 37 and the sound rod 55A
facing each other in the front-rear direction. 67 may be attached. In this case, the support
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portions 63 and 110 may not be used. Further, the member to which the vibration exciter 61 is
attached is not limited to the sound rods 55A to 55D, but may be the peel-off stopper 53.
[0069]
Further, the plurality of vibration exciters 61A to 61C may be in a state in which the vibrator 67
is removed from the bracket 65. In this case, the user selects one of the plurality of vibration
excitation devices 61A to 61C attached in advance, and attaches the vibration exciter 67 later to
emit the desired sound. Can be used selectively.
[0070]
Moreover, you may attach the vibration excitation apparatus 61 not only to the inner side of the
body 11, but the outer side. For example, an excitation device 61D shown in FIG. 12 is attached
to the surface of the top plate 31. In the surface plate 31, the rigidity of the portion to which the
side plate 35 is attached is high, and there is a high possibility of becoming a node of vibration.
The excitation device 61D has plate-like support portions 121 and 123 bent in an L-shape. The
support portions 121 and 123 are disposed outside the side plate 35 in the left and right
direction, and fix the vibration exciter 61D to the body 11 by sandwiching the body 11 from both
sides in the left and right direction. Even in such a configuration, the support portions 121 and
123 can be disposed at the positions of the nodes of vibration, and the exciter 67 can be
disposed at the positions of the antinodes, as in the above embodiment.
[0071]
Moreover, the structure of the support parts 62 and 63 of the said embodiment is an example,
and can be changed suitably. For example, an excitation device 61E shown in FIG. 13 has a nut
111 embedded in a sound rod 55D. The nut 111 is, for example, a buried nut such as a Kirime
nut (registered trademark). The nut 111 engages, for example, a claw provided on the outer
peripheral surface with the sounding rod 55D, and is fixed in the sounding rod 55D. The
hexagonal socket bolt 83 is screwed into the nut 111. In addition, a spring 113 is provided
between the rear end portion 65B and the nut 111 in the vertical direction. The spring 113
elastically deforms in the vertical direction. Thus, the vibration of the back plate 33 is partially
absorbed by the spring 113 and is not directly transmitted from the sounding rod 55D to the
bracket 65. As a result, it is possible to suppress positional deviation of the excitation position P2
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due to vibration. In addition, in this structure, the nut 111 is an example of the support part in
this application.
[0072]
Further, the musical instrument in the present application is not limited to the guitar 10, and may
be another stringed instrument (for example, a violin), and may be a piano, a wind instrument, a
percussion instrument or the like. For example, the vibration device 61 of the above embodiment
may be attached to a sound bar of a sound board of a piano to vibrate the sound board.
Alternatively, the exciter 61 may be attached to the trumpet support to vibrate the bell.
Alternatively, the vibrating device 61 may be attached to the shell of a membrane sounding
instrument such as a drum to vibrate the membrane. また、ギター10は、エレクトリック・ア
コースティック・ギターでもよい。 In this case, for example, the guitar 10 may be configured to
input the vibration obtained by converting the vibration of the string 25 into an electrical signal
by the pickup into the vibration device 61 to vibrate.
[0073]
Moreover, the material, the shape, and the like of each member in the above-described
embodiment are an example, and can be appropriately changed. For example, the material of the
support portions 62 and 63 and the bracket 65 is not limited to metal but may be plastic. Also,
for example, the bracket 65 may be provided with a rib for enhancing the rigidity of a part of the
metal plate. The gap 77 between the upper side plate 62C and the sounding bar 55C and
between the upper side plate 63C and the sounding bar 55D may not be provided.
[0074]
Reference Signs List 10 musical instrument, 33 back plate (sound unit), 61, 61A to 61E exciter,
62, 63, 109, 110, 121, 123 support portion, 65 bracket, 67 exciter, 51 sound bar, 55A to 55D
echo Bar, 75A tapered portion (second tapered portion), 93 coil bobbin (vibrating portion), 95
voice coil (oscillating portion), 103 cap portion, 103B pressing portion, 104 tapered portion (first
tapered portion).
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