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JP2014072555

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DESCRIPTION JP2014072555
Abstract: The present invention provides an electronic device capable of selectively using a state
in which vibration sound is generated and a state in which vibration sound is not generated. A
piezoelectric element (30) that deforms when a voltage is applied, and a first state in which an
oscillating sound is generated that is transmitted through a part of a human body due to the
deformation of the piezoelectric element (30) And a first vibration unit 11 capable of taking a
second state in which no sound is generated. [Selected figure] Figure 1
Electronics
[0001]
The present invention relates to an electronic device that vibrates a vibration unit by applying an
electrical signal such as a voice signal to a piezoelectric element and transmits vibration sound to
a user by transmitting the vibration of the vibration unit to a human body.
[0002]
Patent Document 1 describes an electronic device such as a mobile phone that transmits airconduction sound and bone-conduction sound to a user.
Further, in Patent Document 1, air conduction sound is a sound transmitted to the eardrum by
the vibration of the air caused by the vibration of the object through the ear canal and vibrating
the eardrum. Have been described. Patent Document 1 also describes that bone conduction
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sound is sound transmitted to the user's auditory nerve through a part of the user's body (for
example, the cartilage of the outer ear) that contacts the vibrating object. ing.
[0003]
In the telephone set described in Patent Document 1, it is described that a short plate-shaped
vibrator made of a piezoelectric bimorph and a flexible material is attached to the outer surface
of a housing through an elastic member. In addition, according to Patent Document 1, when a
voltage is applied to the piezoelectric bimorph of the vibrator, the vibrator vibrates as the
piezoelectric material expands and contracts in the longitudinal direction, and the user brings the
vibrator into contact with the pinna. It is described that the air conduction sound and the bone
conduction sound are transmitted to the user.
[0004]
JP 2005-348193 A
[0005]
In the electronic device described in Patent Document 1, no consideration is given to selectively
using the state in which the vibration sound is generated and the state in which the vibration
sound is not generated.
[0006]
An object of the present invention is to provide an electronic device capable of selectively using a
state in which vibration sound is generated and a state in which vibration sound is not generated.
[0007]
An electronic device according to the present invention achieves the above object, comprising: a
piezoelectric element that deforms when a voltage is applied; a first state in which an oscillating
noise is generated that is transmitted through a part of a human body due to the deformation of
the piezoelectric element; And a first vibrating portion capable of taking a second state in which
the vibration noise does not occur even if the piezoelectric element is deformed.
[0008]
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The first vibration unit may be at least a part of a housing of the electronic device.
[0009]
In the first state, a deformation of the piezoelectric element is transmitted from the second
vibrating portion to the housing in the first state, whereby the vibration noise is generated from
the housing. It is also good.
[0010]
Air conduction sound may be generated by the deformation of the piezoelectric element.
[0011]
In the first state, the air conduction sound may be generated from the housing and the second
vibration unit.
[0012]
In the second state, the air conduction sound may be generated from the second vibration unit,
and the air conduction sound may not be generated from the housing.
[0013]
The casing has an opening formed on the main surface, the second vibrating portion is exposed
from the opening, and is fixed to the main surface in the first state, and the main surface in the
second state It may not be fixed with respect to
[0014]
The apparatus may further include a vibration reducing member, which is disposed between the
housing and the second vibrating part, and reduces the transmission of the vibration from the
second vibrating part to the housing in the second state.
[0015]
In the second state, a first air conduction sound generated from the main surface side of the
second vibrating portion is propagated from the second vibration portion to the main surface via
the opening. It may be attenuated by sound.
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[0016]
The cross-sectional shape of the opening may be parabolic.
[0017]
According to the present invention, it is possible to provide an electronic device capable of
selectively using the state in which the vibration sound is generated and the state in which the
vibration sound is not generated.
[0018]
FIG. 1 is an external perspective view showing a schematic configuration of an electronic device
according to a first embodiment of the present invention.
It is sectional drawing which shows the structure of the principal part of the 2nd vibration part of
FIG.
It is a disassembled perspective view which shows the structure of the principal part of the 2nd
vibration part of FIG. 1 in a partial cross section.
It is a figure for demonstrating the operation | movement of the electronic device of FIG.
It is a figure for demonstrating the operation | movement of the electronic device of FIG.
It is a figure for demonstrating the operation | movement of the electronic device of FIG.
It is a figure for demonstrating the operation | movement of the electronic device of FIG.
It is a figure for demonstrating the 1st state and 2nd state of the electronic device of FIG.
It is sectional drawing which shows schematic structure of the principal part of the electronic
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device which concerns on 2nd Embodiment of this invention.
It is an external appearance perspective view which shows the modification of the electronic
device which concerns on this invention.
[0019]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings.
[0020]
First Embodiment FIG. 1 is an external perspective view showing a schematic configuration of an
electronic device according to a first embodiment of the present invention.
The electronic device according to the present embodiment is, for example, a mobile phone such
as a smartphone, and has a housing 11.
The housing 11 is made of a resin or metal case.
In addition, the housing 11 may include a panel such as a protective panel of a display portion or
a touch panel in part.
In the present embodiment, the housing 11 constitutes a first vibration unit.
In addition, although the rectangular-shaped housing | casing 11 is illustrated in planar view in
FIG. 1, the shape of the housing | casing 11 is arbitrary.
[0021]
In the housing 11, an opening 12 a is formed in the main surface 12.
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The second vibrating portion 20 is disposed in the opening 12a so as to be exposed from the
opening 12a. The second vibration unit 20 has a laminated piezoelectric element 30 that deforms
when a voltage is applied, and as described later, the first position exposed from the main surface
12 and the main surface 12 more than the first position. Are provided displaceably so as to
selectively hold the second position exposed therefrom. In the first position, the surface of the
second vibrating unit 20 may be flush with the main surface 12, or may be recessed from or
project from the main surface 12.
[0022]
Next, the configuration of the second vibrating unit 20 will be described.
[0023]
2 and 3 show the configuration of the main part of the second vibrating unit 20, FIG. 2 is a
sectional view, and FIG. 3 is an exploded perspective view showing a partial cross section.
The second vibration unit 20 includes an operation unit 21, a vibration transmission member 22,
a piezoelectric element attachment unit 23, a vibration reduction member 24, a rotation member
25, a compression coil spring 26, and a support 27.
[0024]
The operation portion 21 is formed of a cylindrical body with a bottom, and has a large diameter
portion 21a having a bottom portion and a small diameter portion 21b formed on the opposite
side to the bottom portion of the large diameter portion 21a. A female screw portion 21c is
formed on the inner peripheral surface of the small diameter portion 21b. The operation unit 21
is disposed in the opening 12 a such that the large diameter portion 21 a is exposed to the
outside of the housing 11. A locking portion through which the small diameter portion 21b of the
operation portion 21 penetrates through the opening 12a and which engages with the end
surface of the large diameter portion 21a via the vibration transmitting member 22 at the first
position of the second vibrating portion 20 12b is formed over the inner circumference.
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[0025]
The vibration transmission member 22 is made of, for example, a sponge capable of transmitting
vibration, and is interposed between the large diameter portion 21a of the operation portion 21
and the locking portion 12b of the opening 12a. The vibration transfer member 22 may be
bonded to the end face of the large diameter portion 21a or may be bonded to the locking
portion 12b.
[0026]
The piezoelectric element mounting portion 23 is formed of a cylindrical body with a bottom, and
has a small diameter portion 23a having a bottom portion and a large diameter portion 23b
formed on the open end side of the small diameter portion 23a. In the small diameter portion
23a, a male screw portion 23c is formed on the outer peripheral portion, and the piezoelectric
element 30 is attached to the inner surface of the bottom portion with a double-sided tape, an
adhesive or the like. Further, in the large diameter portion 23b, guide protrusions 23d are
formed at a plurality of locations on the outer peripheral portion, for example, at four locations at
equal intervals around the periphery.
[0027]
In the piezoelectric element attaching portion 23, the small diameter portion 23a to which the
piezoelectric element 30 is attached is the main surface 12 side, and the male screw portion 23c
is screwed with the female screw portion 21c of the small diameter portion 21b of the operation
portion 21. Are inserted into the opening 27a formed in the support portion 27 and arranged.
The guide projections 23d formed in the large diameter portion 23b are respectively engaged
with guide grooves 27b formed to extend in the axial direction on the inner peripheral surface of
the opening 27a of the support portion 27. The axial direction is the vertical direction in FIG. 3
or the direction in which the members are arranged. Thus, the piezoelectric element mounting
portion 23 is supported by the opening 27a so as to be movable in the axial direction. The
piezoelectric element attachment portion 23 is, for example, axially slidably disposed in the
opening 27 a so that the piezoelectric element 30 extends along the short side of the housing 11.
[0028]
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Further, in the piezoelectric element mounting portion 23, a cam surface 23e having a height
difference in the axial direction is formed on the open end face of the large diameter portion 23b.
Further, in the small diameter portion 23a, sound emitting holes 23f for emitting the sound
generated by the displacement (vibration) of the piezoelectric element 30 are formed at a
plurality of places, for example, four places at equal intervals around. In the inner peripheral
surface of the large diameter portion 23b of the piezoelectric element mounting portion 23, a
recessed portion 23g engaged with a locking claw 25c described later of the rotation member 25
is formed along the circumferential direction. The recess 23g has a clearance d in the axial
direction in a state in which the locking claw 25c is locked to the lower surface of the recess 23g.
[0029]
The vibration reducing member 24 is made of, for example, a sponge having a hardness lower
than that of the vibration transmitting member 22, and the end face of the large diameter portion
23 b of the piezoelectric element attachment portion 23 at the second position of the second
vibrating portion 20 is the vibration reducing member 24. Between the large diameter portion
23b of the piezoelectric element mounting portion 23 and the locking portion 12b of the
opening 12a so as to abut on the locking portion 12b of the opening 12a. The vibration reducing
member 24 may be bonded to the large diameter portion 23 b or the locking portion 12 b.
[0030]
The rotation member 25 is formed of a cylindrical body having a small diameter portion 25a
inserted into the large diameter portion 23b of the piezoelectric element mounting portion 23
and a large diameter portion 25b exposed from the large diameter portion 23b. At the end of the
small diameter portion 25a, locking claws 25c are formed at a plurality of locations along the
circumferential direction, for example, at four locations at equal intervals around the periphery.
In the large diameter portion 25b, the inclined surface 27c, which will be described later, is
formed on the cam surface 23e of the piezoelectric element mounting portion 23 and the
support portion 27 at a plurality of locations on the outer peripheral surface, for example, three
locations at equal intervals around the periphery. A pull-in rib 25d that can be engaged with the
stopper portion 27d and the second stopper portion 27e is formed. The small diameter portion
25 a of the rotation member 25 is inserted into the large diameter portion 23 b of the
piezoelectric element attachment portion 23, the locking claw 25 c is engaged with the recess 23
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g, and the rotation member 25 is disposed in the opening 27 a of the support portion 27.
[0031]
The support portion 27 is configured of a fixing member such as a rear case of the housing 11
different from the main surface 12. The opening 27a is formed in the support 27 as described
above, and the guide groove 27b, the inclined surface 27c, the first stopper 27d, and the second
stopper 27e are formed in the opening 27a. Here, with respect to the inclined surface 27c, the
first stopper portion 27d and the second stopper portion 27e, with respect to the rotation
direction of the rotation member 25, the respective lead-in ribs 25d simultaneously function as
the first stopper portion 27d, the inclined surface 27c, and the first The second stopper portion
27e and the inclined surface 27c are formed in order. The first stopper portion 27 d is for
positioning the second vibrating portion 20 at the first position. Further, the second stopper
portion 27e is for positioning the second vibrating portion 20 at the second position, and is
formed in a step shape deeper than the first stopper portion 27d on the main surface 12 side.
[0032]
The open end opposite to the main surface 12 side of the opening 27a is closed by the lid
member 27f. The compression coil spring 26 is disposed in a compressed state between the
bottom of the piezoelectric element mounting portion 23 and the lid member 27 f through the
cylindrical portion of the piezoelectric element mounting portion 23 and the cylindrical portion
of the rotating member 25. . Thereby, the piezoelectric element attachment portion 23 and the
rotation member 25 are always biased to the main surface 12 side.
[0033]
The operation of the electronic device according to the present embodiment will be described
below.
[0034]
FIG. 4 is a cross-sectional view showing a part of the state in which the second vibrating unit 20
holds the first position.
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In this state, each pull-in rib 25d of the pivoting member 25 abuts on the first stopper portion
27d of the support portion 27, and the locking claw 25c is biased by the compression coil spring
26 to form the recess 23g of the piezoelectric element mounting portion 23. It is locked on the
lower surface of the Further, the operation unit 21 engages with the housing 11 via the vibration
transfer member 22. Therefore, in this state, when the piezoelectric element 30 is driven by an
audio signal or the like to cause bending vibration (deformation), the vibration is propagated to
the operation unit 21 as schematically shown in FIG. 21 vibrates and a sound is generated by the
vibration. Further, the vibration of the operation unit 21 is transmitted to the housing 11 via the
vibration transfer member 22, and the main surface 12 of the housing 11 is vibrated to generate
a sound due to the vibration.
[0035]
Therefore, the user can hear both of the air conduction sound and the vibration sound
transmitted by vibrating the ear (contact portion) contacting the main surface, for example, by
bringing the main surface 12 into contact with his / her ear. That is, this state corresponds to the
first state of the casing 11 that constitutes the first vibration unit. As described above, in the first
state, the main surface 12 having a larger area than the operation unit 21 vibrates together with
the operation unit 21. Therefore, the volume becomes large as compared with the case where
only the operation unit 21 vibrates. It becomes easy to get out. Therefore, the user can listen to a
sound with good sound quality.
[0036]
Thereafter, when the operation portion 21 is pushed toward the support portion 27 from the
state shown in FIG. 4 against the biasing force of the compression coil spring 26 and the elastic
force of the vibration transfer member 22, the piezoelectric element attachment portion 23 It
descends together. In the case where the housing 11 has flexibility such as acrylic, bending of the
housing 11 is also added when pushing the operation unit 21. When the piezoelectric element
mounting portion 23 lowers the axial clearance d of the locking claw 25c in the recess 23g and
the upper end of the locking claw 25c abuts on the upper surface of the recess 23g, the rotating
member 25 is then mounted with the piezoelectric element Lower integrally with the part 23.
Then, as shown in FIG. 5, when each pulling-in rib 25d moves downward from the first stopper
portion 27d and exceeds the inclined surface 27c of the support portion 27, each pulling-in rib
25d follows the cam surface 23e. And move to the bottom of the cam surface 23e. As a result,
the pivoting member 25 pivots relative to the piezoelectric element attachment portion 23
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following the pressing of the operation portion 21.
[0037]
Thereafter, when the pushing of the operation unit 21 is released, the operation unit 21 and the
piezoelectric element attachment unit 23 move upward by the biasing force of the compression
coil spring 26. Then, when the piezoelectric element attaching portion 23 ascends the above
clearance d and the locking claw 25c is engaged with the lower surface of the recess 23g,
thereafter, the pivoting member 25 ascends integrally with the piezoelectric element attaching
portion 23. As a result, as shown in FIG. 6, each pulling-in rib 25d separates from the cam
surface 23e and ascends while rotating along the inclined surface 27c of the support portion 27.
After that, each pulling-in rib 25d is lowered into the groove of the second stopper portion 27e
of the support portion 27, and abuts on the second stopper portion 27e. Accordingly, the second
vibrating unit 20 is held at the second position where the operation unit 21 protrudes from the
main surface 12 more than the first position. Also, the piezoelectric element attachment portion
23 engages with the housing 11 via the vibration reducing member 24.
[0038]
Therefore, in this state, when the piezoelectric element 30 is driven by an audio signal or the like
to vibrate (deform), the vibration is transmitted to the operation unit 21 and the operation unit
21 vibrates, as shown in FIG. Sound is generated by the vibration. However, since the housing 11
is in contact with the piezoelectric element mounting portion 23 via the vibration reducing
member 24, the vibration transmitted to the housing 11 is attenuated. As a result, the main
surface 12 hardly vibrates and no sound is generated.
[0039]
Therefore, the user can hear both the air conduction sound and the vibration sound transmitted
by vibrating the ear (contact portion) contacting the main surface by bringing the user's ear into
contact with the operation unit 21. That is, this state corresponds to the second state of the
casing 11 that constitutes the first vibration unit. Further, as schematically shown in FIG. 8B, the
sound generated on the side of the rotating member 25 by the vibration of the piezoelectric
element 30 is emitted to the outside from the sound emitting hole 23f of the piezoelectric
element mounting portion 23 through the opening 12a. Be done. Here, the sound generated on
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the side of the rotating member 25 by the piezoelectric element 30 and the sound generated
from the operation unit 21 on the opposite side are out of phase. Preferably, the phases are
reversed. Therefore, the air conduction sound leaking from the operation unit 21 to the outside is
attenuated by the air conduction sound emitted from the sound emission hole 23 f, and the
sound leakage is reduced.
[0040]
Thereafter, from the state shown in FIG. 6, when the operation portion 21 is pushed toward the
support portion 27 against the urging force of the compression coil spring 26, the piezoelectric
element attachment portion 23 is lowered. Then, when the piezoelectric element attaching
portion 23 descends the clearance d and the upper end of the locking claw 25c abuts on the
upper surface of the recess 23g, thereafter, the pivoting member 25 descends integrally with the
piezoelectric element attaching portion 23. Then, as shown in FIG. 7, when each pulling-in rib 25
d descends from the second stopper portion 27 e and exceeds the inclined surface 27 c of the
support portion 27, each pulling-in rib 25 d follows the cam surface 23 e and cams It moves to
the bottom of the surface 23e. As a result, the pivoting member 25 pivots relative to the
piezoelectric element attachment portion 23 following the pressing of the operation portion 21.
[0041]
Thereafter, when the pushing of the operation unit 21 is released, the operation unit 21 and the
piezoelectric element attachment unit 23 move upward by the biasing force of the compression
coil spring 26. Then, when the piezoelectric element attaching portion 23 ascends the above
clearance d and the locking claw 25c is engaged with the lower surface of the recess 23g,
thereafter, the pivoting member 25 ascends integrally with the piezoelectric element attaching
portion 23. As a result, each drawing-in rib 25d separates from the cam surface 23e and ascends
while rotating along the inclined surface 27c of the support portion 27. Thereafter, each
drawing-in rib 25d is lowered to the first stopper portion 27d of the support portion 27 and is in
contact with the first stopper portion 27d. Thus, the second vibrating unit 20 is held at the first
position shown in FIG.
[0042]
According to the electronic device according to the present embodiment, the second vibrating
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portion 20 is pushed further from the first position and the first position pushed to the main
surface 12 side and biased by the compression coil spring 26, A so-called push lock mechanism
is provided which selectively holds the second position protruding from the main surface 12
ascending from the first position. Then, in a state where the second vibration unit 20 is held at
the first position, a vibration sound is generated which is transmitted through the part of the
human body by the vibration of the piezoelectric element 30 on the main surface 12 which is the
first vibration unit. It can be done. Further, in the state where the second vibrating portion 20 is
held at the second position, the main surface 12 can be brought into a second state in which no
vibration noise is generated from the main surface 12 even if the piezoelectric element 30
vibrates. Thereby, the main surface 12 which is the first vibrating portion can be easily used
properly in the first state in which the vibration sound is generated and the second state in which
the vibration sound is not generated.
[0043]
Second Embodiment FIG. 9 is a cross-sectional view showing a schematic configuration of a main
part of an electronic device according to a second embodiment of the present invention. In the
electronic device according to the present embodiment, in the configuration of the electronic
device according to the first embodiment, the cross-sectional shape of the opening 12a of the
main surface 12 is parabolic. The parabolic focal point is located at or near the piezoelectric
element 30 in a state where the second vibrating unit 20 is held at the second position, as shown
in FIG. The cross-sectional shape of the operation unit 21 may be the same as that of the first
embodiment, or may be similar to the cross-sectional shape of the opening 12a.
[0044]
According to this configuration, the sound emitted from the piezoelectric element 20 through the
sound emitting hole 23 f is reflected by the paraboloid of the opening 12 a and emitted in the
direction substantially normal to the main surface 12. As a result, the number of times of
reflection of the sound in antiphase emitted from the piezoelectric element 20 is reduced
compared to the case of the first embodiment, and the phase change of the sound due to the
reflection is reduced. Moreover, since the direction of sound emission from the opening 12a is
substantially normal to the main surface 12, the sound generated from the operation unit 21 is
more efficiently attenuated by the sound from the opening 12a, and the sound leaks Is more
efficiently reduced.
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[0045]
The present invention is not limited to the above embodiment, and many modifications or
changes are possible. For example, the push lock mechanism of the second vibrating unit 20 can
adopt other known mechanisms. Further, the shape of the second vibrating portion 20 viewed
from the main surface 12 is not limited to a circular shape, and may be appropriately changed
into an elliptical shape, a rectangular shape, or a shape according to a human ear shape. The
main surface 12 which is the first vibrating portion may have any structure as long as it can take
a first state in which a vibration sound is generated and a second state in which a vibration sound
is not generated. Moreover, the arrangement position of the 2nd vibration part 20 seen from the
main surface 12 side is also changeable suitably. Therefore, the second vibrating portion 20 may
be formed at the corner of the main surface 12 or at one end of the main surface 12 as shown in
FIG.
[0046]
Further, in the above embodiment, the piezoelectric element 30 is mounted on the second
vibrating portion 20, and in the first state, the vibration of the piezoelectric element 30 is
transmitted from the second vibrating portion 20 to the housing 11 which is the first vibrating
portion. Vibration sound is generated from the housing 11, and in the second state, the
piezoelectric element 30 is deformed but vibration of the piezoelectric element 30 is not
transmitted to the housing 11, and vibration sound is not generated from the housing 11.
However, the present invention is limited thereto I will not. For example, the third state in which
the piezoelectric element 30 is mounted on the housing 11 and the vibration of the piezoelectric
element 30 is transmitted to the second vibrating unit 20, and the fourth state in which the
vibration of the piezoelectric element 30 is not transmitted to the second vibrating unit 20 It may
be a configuration that can take In this case, in the third state, vibration sound is generated from
the second vibration unit 20 due to the deformation of the piezoelectric element 30, and in the
fourth state, the piezoelectric element 30 is deformed but vibration sound is not generated from
the second vibration portion 20.
[0047]
Further, in the electronic device 1 described above, although a laminated piezoelectric element is
mentioned as an example of a vibrating element that deforms or vibrates when a voltage is
applied, the present invention is not limited to this. The vibrating element may be a piezoelectric
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element of a type different from that of the laminated type. For example, the vibration element
may be a so-called unimorph piezoelectric element configured by attaching a single piezoelectric
ceramic plate to a metal plate. The vibrating element may be a piezoelectric element called a socalled monomorph which does not have a metal plate and is deformed by only one piezoelectric
ceramic plate. The vibrating element may be different from the piezoelectric element as long as
the panel 10 can be vibrated. The vibrating element may be, for example, an electromagnetic
vibrating element equipped with a coil and a magnet, which is mounted on a conventional
dynamic speaker. The vibrating element may be, for example, an eccentric motor.
[0048]
DESCRIPTION OF SYMBOLS 11 housing | casing (1st vibration part) 12 main surface 20 2nd
vibration part 21 operation part 22 vibration transmission member 23 piezoelectric element
attachment part 24 vibration reduction member 25 rotation member 26 compression coil spring
27 support part 30 piezoelectric element
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