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JP2013219720

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DESCRIPTION JP2013219720
Abstract: The present invention provides an electronic device that can be suitably used even in a
type in which a panel attached to a housing is vibrated. A housing (60) having a piezoelectric
element (30), a first main surface part to which the piezoelectric element is fixed, and a second
main surface part facing the first main surface part, and is inserted inside the second main
surface part The claw portion 66 is detachably coupled to the second main surface portion by the
engagement portion 67 engaged with the second main surface portion with the claw portion
inserted inside the second main surface portion. An electronic apparatus 1 having a lid member
64 for generating air conduction sound and vibration sound transmitted by vibrating a part of a
human body by the case, wherein the piezoelectric element is the first main surface portion
Provided on a first side 60a in a first direction parallel to the second side, and a coupling position
to which the lid member is coupled is provided on a second side 60b opposite to the first side in
the first direction . [Selected figure] Figure 3
Electronics
[0001]
According to the present invention, an electronic is used to vibrate a panel by applying a
predetermined electric signal (sound signal) to a piezoelectric element, and transmit an air
conduction sound and a human body vibration sound to a user by transmitting the vibration of
the panel to the human body. It relates to the equipment.
[0002]
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1
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. Further, Patent Document 1 describes that the human body
vibration sound is a sound transmitted to the user's auditory nerve through a part of the user's
body (for example, the cartilage of the outer ear) contacting 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 bends and vibrates as
the piezoelectric material stretches 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 human body vibration sound are transmitted to the user.
[0004]
JP 2005-348193 A
[0005]
In the electronic device described in Patent Document 1, a vibrator is attached to the outer
surface of a housing such as a mobile phone.
Therefore, no consideration has been given to the problem when the panel attached to the
housing is vibrated.
[0006]
An object of the present invention is to provide an electronic device that can be suitably used for
an electronic device of a type in which a panel attached to a housing is vibrated.
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2
[0007]
The electronic device according to the present invention includes a piezoelectric element, a
casing having a first main surface portion to which the piezoelectric element is fixed, and a
second main surface portion facing the first main surface portion, and is inserted inside the
second main surface portion. And the engaging portion that engages with the second main
surface in a state where the claw is inserted inside the second main surface, and is detachably
coupled to the second main surface. An electronic device for generating an air conduction sound
and an oscillating sound transmitted by vibrating a part of a human body by the casing, the
piezoelectric element being parallel to the first main surface portion It is provided on a first side
in a first direction, and a coupling position to which the lid member is coupled is provided on a
second side opposite to the first side in the first direction.
[0008]
The position where the claw portion is inserted may be located closer to the second side in the
first direction than the position where the engagement portion is engaged.
[0009]
The housing may include a vibrating plate to which the piezoelectric element is fixed, and a base
to which the vibrating plate and the coupling portion are coupled.
[0010]
The coupling portion may have a packing portion disposed along the outer periphery thereof.
The base may have a groove in which the packing portion is embedded.
[0011]
The length in the first direction from the side to which the piezoelectric element is fixed to the
other side in a plan view of the diaphragm is preferably equal to or greater than the length from
the antitragus to the lower leg of the anulus.
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3
The length of the diaphragm in a direction intersecting with the first direction in a plan view may
be equal to or greater than the length from the tragus to the ankle.
[0012]
The piezoelectric element can be bonded and fixed to the diaphragm by a bonding member.
The bonding member may be a non-heat curable adhesive or a double-sided tape.
[0013]
The diaphragm can be joined to the housing by a joining member.
The bonding member may be a non-heat curable adhesive or a double-sided tape.
[0014]
The diaphragm may constitute any or all of a display unit, an input unit, and a cover of the
display unit.
[0015]
The fixed portion of the piezoelectric element in the diaphragm may be located outside an
overlapping area with the display unit in a plan view of the diaphragm.
[0016]
The electronic device according to the present invention can appropriately use an electronic
device of a type in which a panel attached to a housing is vibrated.
[0017]
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4
It is a figure which shows the functional block of the electronic device which concerns on one
Embodiment of this invention.
It is a figure which shows the suitable shape of a panel.
It is a figure which shows the mounting structure of the electronic device which concerns on 1st
Embodiment.
It is a figure which shows the mounting structure of the electronic device which concerns on 1st
Embodiment. It is a figure which shows an example of a vibration of the panel of the electronic
device which concerns on 1st Embodiment. It is a figure which shows the mounting structure of
the electronic device which concerns on 2nd Embodiment. It is a figure which shows an example
of a vibration of the panel of the electronic device which concerns on 2nd Embodiment. It is a
figure which shows the example of joining of a panel and a housing | casing.
[0018]
Hereinafter, embodiments of the present invention will be described in detail with reference to
the drawings. FIG. 1 is a diagram showing functional blocks of an electronic device 1 according
to an embodiment of the present invention. The electronic device 1 is, for example, a mobile
phone (smart phone), and includes a panel 10, a display unit 20, a piezoelectric element 30, an
input unit 40, and a control unit 50. The panel 10 is an example of the "diaphragm" in this
embodiment. Although the structure of the electronic device 1 will be described in detail later,
the electronic device 1 is a case 60 in which the panel 10 is fixed and the display unit 20, the
piezoelectric element 30, the input unit 40, the control unit 50 and the like are stored. And.
[0019]
The panel 10 is a touch panel that detects a touch, a cover panel that protects the display unit
20, or the like. The panel 10 is formed of, for example, glass or a synthetic resin such as acrylic.
The shape of the panel 10 may be plate-like. The panel 10 may be a flat plate, or may be a
curved panel with a smooth surface. When the panel 10 is a touch panel, the panel 10 detects a
touch of a user's finger, a pen, a stylus pen, or the like. As a detection method of the touch panel,
any method such as a capacitance method, a resistance film method, a surface acoustic wave
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5
method (or an ultrasonic method), an infrared method, an electromagnetic induction method, and
a load detection method can be used.
[0020]
The display unit 20 is a display device such as a liquid crystal display, an organic EL display, or
an inorganic EL display. The display unit 20 is provided on the back of the panel 10. The display
unit 20 is disposed on the back of the panel 10 by a bonding member (for example, an adhesive).
The display unit 20 may be disposed apart from the panel 10 and may be supported by the
housing of the electronic device 1.
[0021]
The piezoelectric element 30 is an element that expands and contracts or bends according to the
electromechanical coupling coefficient of the constituent material by applying an electric signal
(voltage). As these elements, for example, those made of ceramic or quartz are used. The
piezoelectric element 30 may be a unimorph, bimorph or stacked piezoelectric element. The
laminated piezoelectric element includes a laminated bimorph element in which bimorphs are
laminated (for example, 16 layers or 24 layers are laminated). The laminated piezoelectric
element is formed of a laminated structure of, for example, a plurality of dielectric layers made of
PZT (lead zirconate titanate) and an electrode layer disposed between the plurality of dielectric
layers. Unimorphs expand and contract when an electric signal (voltage) is applied, and bimorph
bends when an electric signal (voltage) is applied.
[0022]
The piezoelectric element 30 is disposed on the back surface of the panel 10 (the surface on the
inner side of the electronic device 1). The piezoelectric element 30 is attached to the panel 10 by
a bonding member (for example, double-sided tape). The piezoelectric element 30 may be
attached to the panel 10 via an intermediate member (for example, a sheet metal). The
piezoelectric element 30 is spaced apart from the surface on the inner side of the housing 60 by
a predetermined distance in a state of being disposed on the back surface of the panel 10. It is
preferable that the piezoelectric element 30 be separated from the surface on the inner side of
the housing 60 by a predetermined distance even in a state of expansion and contraction or
bending. That is, the distance between the piezoelectric element 30 and the surface on the inner
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side of the housing 60 may be larger than the maximum amount of deformation of the
piezoelectric element 30.
[0023]
The input unit 40 receives an operation input from the user, and includes, for example, operation
buttons (operation keys). When the panel 10 is a touch panel, the panel 10 can also receive an
operation input from the user by detecting a touch from the user.
[0024]
The control unit 50 is a processor that controls the electronic device 1. The control unit 50
applies a predetermined electric signal (a voltage corresponding to the audio signal) to the
piezoelectric element 30. The voltage applied to the piezoelectric element 30 by the control unit
50 is, for example, ± 15 V, which is higher than ± 5 V that is an applied voltage of a so-called
panel speaker aiming to conduct sound by air conduction sound instead of human body vibration
sound. May be there. As a result, even when the user presses the panel 10 against his / her body
with a force of 3 N or more (for example, 5 N to 10 N), the panel 10 generates sufficient
vibration to cause one of the user's body Human body vibration noise can be generated through
the unit. The level of applied voltage can be appropriately adjusted according to the fixed
strength of the panel 10 to the housing or the support member or the performance of the
piezoelectric element 30.
[0025]
When the control unit 50 applies an electrical signal to the piezoelectric element 30, the
piezoelectric element 30 stretches or bends in the longitudinal direction. At this time, the panel
10 to which the piezoelectric element 30 is attached is deformed according to the expansion or
contraction or bending of the piezoelectric element 30, and the panel 10 vibrates. Therefore, the
panel 10 generates an air conduction sound and also generates a human body vibration sound
through the body part when the user contacts the body part (for example, the cartilage of the
outer ear). For example, the control unit 50 can cause the piezoelectric element 30 to apply an
electrical signal corresponding to an audio signal related to the voice of the other party, and
generate an air conduction sound and a human body vibration noise corresponding to the audio
signal. The audio signal may be related to a ring tone, music including music, and the like. Note
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that the audio signal relating to the electrical signal may be based on music data stored in the
internal memory of the electronic device 1, or music data stored in an external server or the like
is reproduced via the network. May be
[0026]
The panel 10 vibrates not only in the mounting area where the piezoelectric element 30 is
mounted, but also in the area away from the mounting area. The panel 10 has a plurality of
points vibrating in a direction intersecting the main surface of the panel 10 in the vibrating area,
and the value of the vibration amplitude changes from positive to negative with time in each of
the plurality of points. Or it changes in the opposite way. At a certain moment, the panel 10
vibrates in such a manner that the relatively large part of the vibration amplitude and the
relatively small part of the vibration seem to be randomly or periodically distributed over
substantially the entire panel 10. That is, vibration of a plurality of waves is detected over the
entire area of the panel 10. Even if the user presses the panel 10 against his / her body with a
force of, for example, 5N to 10N, the controller 50 controls the piezoelectric element 30 so that
the above-described vibration of the panel 10 does not attenuate. The applied voltage may be ±
15V. Therefore, the user can hear the sound by bringing the ear into contact with the area away
from the mounting area of the panel 10 described above.
[0027]
Here, the panel 10 may be approximately the same size as the user's ear. Also, as shown in FIG. 2,
the panel 10 may be larger than the user's ear. In this case, when the user listens to the sound,
the entire ear is easily covered by the panel 10 of the electronic device 1, so ambient noise
(noise) can be made less likely to enter the ear canal. The panel 10 is wider than a region having
a length corresponding to the distance from the lower ear ring (lower leg) to the anti tragus and
a width corresponding to the distance from the tragus to the anti-ear wheel Should vibrate. The
panel 10 preferably has a length corresponding to the distance from the portion near the upper
ear ring leg (upper upper wheel leg) to the ear lobe in the ear ring, and the distance between the
portion from the tragus to the portion near the anti ear ring in the ear ring A region having a
width corresponding to H may vibrate.
[0028]
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8
Here, the longitudinal direction is the longitudinal direction 2a in which the panel 10 extends,
and the piezoelectric element 30 is disposed closer to one end from the center thereof. Moreover,
the width direction is a direction 2b orthogonal to the longitudinal direction. The region having
such length and width may be a rectangular region, or may be an elliptical shape having the
above length as the major axis and the above width as the minor axis. The average size of
Japanese ears can be known by referring to the Japanese Human Body Size Database (19921994) prepared by the Human Life Engineering Research Center (HQL). If the size of the panel
10 is larger than the average size of Japanese ears, the panel 10 is considered to be a size that
can cover almost the entire foreign ears. By having the size and shape as described above, the
panel 10 can cover the user's ear and is tolerant of displacement when placed on the ear.
[0029]
The electronic device 1 described above can transmit the air conduction sound and the human
body vibration sound through a part of the user's body (for example, the cartilage of the outer
ear) to the user by the vibration of the panel 10. Therefore, when outputting a sound having a
volume equivalent to that of a conventional dynamic receiver, the sound transmitted to the
surroundings of the electronic device 1 due to the vibration of air due to the vibration of the
panel 10 is smaller than that of the dynamic receiver. Therefore, it is suitable, for example, when
listening to a recorded message on a train or the like.
[0030]
In addition, since the electronic device 1 described above transmits the human body vibration
sound by the vibration of the panel 10, for example, even if the user wears earphones or
headphones, the user contacts the earphones by bringing the electronic device 1 into contact
with them. Or you can hear the sound through headphones and body parts.
[0031]
The electronic device 1 described above transmits a sound to the user by the vibration of the
panel 10.
Therefore, when the electronic device 1 does not separately include a dynamic receiver, it is not
necessary to form an opening (sound outlet) for sound transmission in the housing, and the
waterproof structure of the electronic device 1 can be simplified. In addition, when the electronic
11-05-2019
9
device 1 is equipped with a dynamic receiver, it is good for the sound emission port to be
obstruct | occluded by the member which allows gas but does not allow liquid. The part that is
permeable to gas but not liquid is, for example, Gore-Tex®.
[0032]
First Embodiment FIG. 3 is a view showing a mounting structure of an electronic device 1
according to a first embodiment. Fig.3 (a) is a front view, FIG.3 (b), (c) is sectional drawing along
the bb line in FIG. 3 (a), FIG.3 (d) is a rear view. The electronic device 1 illustrated in FIG. 3 is a
smartphone in which a touch panel, which is a glass plate, is disposed on the front surface of a
housing 60 (for example, a metal or resin case) as the panel 10.
[0033]
The circuit board 52 on which the panel 10, the input unit 40, and the control unit 50 are
provided is supported by the housing 60. In the housing 60, a battery 300 for supplying power
to the display unit 20, the piezoelectric element 30, the input unit 40, the control unit 50, and
the like is accommodated. An opening 62 for inserting and removing the battery 300 is provided
on the back of the case 60. In addition, the housing 60 has a lid member 64 that is detachably
coupled to the opening 62 and seals the opening 62. FIG. 3B shows a state in which the lid
member 64 is mounted, and FIG. 3C shows a state in which the lid member 64 is removed.
[0034]
Here, the front surface portion of the case 60 having the panel 10 is the "first main surface
portion" to which the piezoelectric element 30 is fixed, and the rear surface portion provided
with the lid member 64 faces the "first main surface portion" It is a 2nd main surface part.
Further, a portion of the housing 60 other than the panel 10 to which the panel 10 is fixed
corresponds to the base 61.
[0035]
The lid member 64 is coupled to the rear surface of the housing 60, that is, the base 61 by the
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claws 66 and the engaging portions 67. The claw portion 66 is inserted, for example, inside the
opening 62 to position the lid member 64. On the other hand, the engaging portion 67 engages
with a notch or a recess provided on the inner side wall of the opening 62 in a state where the
claw 66 is inserted inside the opening 62. When attaching the lid member 64, as shown in FIG.
3C, the hook 66 is first inserted into the opening 32 (arrow 36), and the hook 67 is inserted into
the opening 32 with the hook 66 inserted. Is pushed in (arrow 38). The engagement portion 67
is resiliently engaged with the inner wall of the opening 62 or engaged with a notch or recess
provided in the inner wall.
[0036]
Further, as shown in FIG. 3D, when the piezoelectric element 30 is parallel to the front surface of
the housing 60 in a plan view of the electronic device 1, for example, the first in the longitudinal
direction of the rectangular housing 60. When provided on the side (upper side in FIG. 3D) 60a,
the connecting position of the lid member 64 is provided on the lower side (lower side in FIG.
3D) 60b opposite to the first side 60a. Here, the first side 60a and the second side 60b are
parallel to the front surface portion of the housing 60, for example, a lateral direction orthogonal
to the longitudinal direction at the middle point of the length in the longitudinal direction and the
boundary 302 In this case, the side on which the piezoelectric element 30 is provided
corresponds to the first side 60a, and the other corresponds to the second side 60b. When the
piezoelectric element 30 is disposed beyond the boundary 302, the side including half or more of
the area of the piezoelectric element 30 corresponds to the first side 60a, and the other side
corresponds to the second side 60b.
[0037]
When the piezoelectric element 30 vibrates the panel 10, the vibration of the panel 10 is
transmitted to the base 61 via the joint portion between the panel 10 and the base 61 of the
housing 60. Then, the vibration is transmitted to the claw portion 66 and the engagement
portion 67 of the lid member 64 that contacts the base 61 at the opening 62. The claw portion
66 and the engagement portion 67 have a certain amount of play with the base portion 61, and
therefore rattling according to the vibration when the vibration is transmitted. However, the
vibration transmitted through the base portion 61 is attenuated according to the distance from
the piezoelectric element 30 which is the generation source. Therefore, in the present
embodiment, the coupling position of the lid member 64 (that is, for example, the position of the
opening 62) is provided not on the upper side 60a but on the lower side 60b of the housing 60
in which the piezoelectric element 30 is provided. By doing so, compared with the case where the
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11
coupling position of the lid member 64 is provided on the same upper side 60 a as the
piezoelectric element 30, the vibration transmitted to the claw coupling portion 66 and the
engagement portion 67 can be reduced. Therefore, the volume of the sound generated by the
vibration can be reduced.
[0038]
In a further preferable aspect in this embodiment, as shown in FIGS. 3B to 3D, the position where
the claw portion 66 is inserted into the opening 62 is the position where the engaging portion 67
engages with the opening 62. It is provided closer to the second side 62b. That is, the position
where the claw portion 66 is inserted is provided farther from the position of the piezoelectric
element 30 (closer to the lower side in the drawing) than the position where the engaging
portion 67 is engaged. The claw portion 66 is configured to have a larger play than the
engagement portion 67 because the claw portion 66 has a function as positioning when the
engagement portion 67 is engaged. Therefore, when receiving the vibration of the same
magnitude, it vibrates more than the engaging portion 67. However, by thus arranging the claws
66 farther from the piezoelectric element 30 which is the generation source of the vibration than
the engaging portion 67, the vibration can be attenuated more easily than in the reverse case,
and the influence of the vibration can be suppressed. Can.
[0039]
The display unit 20 and the piezoelectric element 30 are each bonded to the panel 10 by a
bonding member 70. The bonding member 70 is an adhesive having thermosetting or ultraviolet
curing properties, a double-sided adhesive tape, or the like, and may be, for example, an optical
elastic resin which is a colorless and transparent acrylic ultraviolet curing adhesive. The panel
10, the display unit 20, and the piezoelectric element 30 each have a substantially rectangular
shape.
[0040]
The display unit 20 is disposed substantially at the center of the panel 10 in the lateral direction.
The piezoelectric element 30 is disposed at a predetermined distance from an end in the
longitudinal direction of the panel 10, and in the vicinity of the end such that the longitudinal
direction of the piezoelectric element 30 is along the short side of the panel 10. The display unit
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20 and the piezoelectric element 30 are arranged side by side in a direction parallel to the
surface on the inner side of the panel 10.
[0041]
FIG. 4 is a perspective view of the case 60 in an example. In FIG. 4, a perspective view from the
back of the housing 60 is shown with the lid member 64 removed. The housing 60 has an
opening 62 covered by a lid member 64 on the base 61 side (that is, the back side here). The
opening 62 is provided on the side 60 b opposite to the side 60 a of the piezoelectric element 30.
Here, illustration of the battery is omitted. The lid member 64 has claws 66_1 and 66_2 inserted
into the opening 62, and engaging portions 67_1 and 67_2 engaged with the opening 62. The
claws 66_1 and 66_2 protrude outward of the lid member 64, and when the lid member 64 is
attached to the opening 62, the claws 66_1 and 66_2 are inserted into the recesses 66_1a and
66_2a provided on the inner side wall of the opening 62. Then, the claws 66_1 and 66_2 are
urged outward from the inside of the recess 66a, that is, upward in the drawing, to the inner wall
of the recess 66a by an elastic force. In this state, the lid 64 is rotated about the end of the lid 64
provided with the claws 66_1 and 66_2, and the engaging portions 67_1 and 67_2 are pushed
into the opening 62. At this time, the engaging portions 67_1 and 67_2 are inserted into the
opening 62 while being elastically deformed while being in contact with the inner side wall of the
opening 62, and are provided in the notches or recesses 67_1a and 67_2a provided on the inner
side wall of the opening 62. Engage. Thus, the lid member 64 is attached to the housing 60.
[0042]
The lid member 64 may have a packing portion 65 a having a shape along the outer periphery of
the lid member 64 inside the claw portion 66 and the engaging portion 67. The packing portion
65 a is formed of an elastic member such as silicon, rubber, or plastic. The packing portion 65 a
may be integrally molded with the lid member 64. On the other hand, inside the opening 62 in
the base 61, a groove 65b is provided in which the packing 65a is embedded. By burying the
packing portion 65 a in the groove portion 65 b, the gap between the lid member 64 and the
opening portion 62 is sealed, and water can be prevented from entering the housing 60. In such
a waterproof structure, by arranging the coupling position of the lid member 64 on the side 60b
opposite to the side 60a of the piezoelectric element 30, it is possible to suppress the
deterioration of the packing portion 65a due to vibration and to prevent the deterioration of the
waterproof function. .
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[0043]
FIG. 5 is a view showing an example of the vibration of the panel 10 of the electronic device 1
according to the first embodiment. In the electronic device 1 according to the first embodiment,
the display unit 20 is attached to the panel 10. Therefore, the lower portion of the panel 10 is
less likely to vibrate than the upper portion of the panel 10 to which the piezoelectric element 30
is attached. Therefore, in the lower part of the panel 10, sound leakage due to the vibration of
the lower part of the panel 10 can be reduced.
[0044]
As described above, according to the electronic device 1 according to the present embodiment,
the panel 10 is deformed due to the deformation of the piezoelectric element 30 attached to the
back surface of the panel 10, and the object contacts the deformed panel 10. In response, air
conduction sound and human body vibration sound are transmitted. That is, the panel 10 which
is a part of the housing 60 vibrates to generate the air conduction sound and the human body
vibration sound. Thus, the air conduction sound and the human body vibration sound can be
transmitted to the user without causing the vibration body to protrude to the outer surface of the
housing 60. Therefore, a patent for bringing a very small vibration body into contact with the
human body as compared to the housing. The ease of use is improved over the electronic device
described in Document 1. Further, since it is not necessary to put the user's ear on the
piezoelectric element itself, the piezoelectric element 30 itself is unlikely to be damaged. In the
case where the case 60 is deformed instead of the panel 10, the user is likely to drop the
terminal when generating the vibration, but when the panel 10 is vibrated, such a case is caused.
It is hard to happen.
[0045]
The piezoelectric element 30 is bonded to the panel 10 by a bonding member 70. Thus, the
piezoelectric element 30 can be attached to the panel 10 in a state in which the freedom of
deformation of the piezoelectric element 30 is not easily inhibited. Further, the bonding member
70 can be made of a non-heat curable adhesive. This has the advantage that thermal stress
contraction is less likely to occur between the piezoelectric element 30 and the panel 10 during
curing. Further, the bonding member 70 can be a double-sided tape. As a result, there is an
advantage that the contraction stress as in use of the adhesive is unlikely to be applied between
the piezoelectric element 30 and the panel 10.
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[0046]
Second Embodiment FIG. 6 is a view showing a mounting structure of an electronic device 1
according to a second embodiment. 6 (a) is a front view, FIG. 6 (b) is a cross-sectional view taken
along the line b-b in FIG. 6 (a), and FIG. 6 (c) is taken along the line c-c in FIG. 6 (a) FIG. The
electronic device 1 shown in FIG. 6 is a foldable mobile phone in which a cover panel (acrylic
plate) for protecting the display unit 20 as the panel 10 is disposed on the front of the upper
case 60. The coupling position of the lid member 64 is provided not on the side 60 a of the
housing 60 where the piezoelectric element 30 is provided, but on the other side 60 b. By doing
so, as in the first embodiment, the sound generated by the vibration of the piezoelectric element
30 being transmitted to the claw portion 66 and the engagement portion 67 via the base portion
61 of the housing 60, and the coupling portion 66. Deterioration of the provided packing portion
can be suppressed. Furthermore, preferably, the claw portion 66 is provided on the side farther
from the piezoelectric element 30 than the engaging portion 67. By doing so, it is possible to
suppress the vibration to the claw portion 66 having a larger play.
[0047]
In the second embodiment, a reinforcing member 80 is disposed between the panel 10 and the
piezoelectric element 30. The reinforcing member 80 is a plate made of resin, for example, a
plate made of resin, or a plate made of resin or glass fiber. That is, the electronic device 1
according to the second embodiment has a structure in which the piezoelectric element 30 and
the reinforcing member 80 are bonded by the bonding member 70, and the reinforcing member
80 and the panel 10 are bonded by the bonding member 70. Further, in the second embodiment,
the display unit 20 is supported not by the panel 10 but by the housing 60. That is, in the
electronic device 1 according to the second embodiment, the display unit 20 is separated from
the panel 10, and the display unit 20 and the support unit 90 which is a part of the housing 60
are bonded by the bonding member 70. It is a structure. In addition, the support part 90 is not
limited to the structure as a part of housing | casing 60, It is possible to comprise as a member
independent of the housing | casing 60 by metal, resin, etc. FIG.
[0048]
FIG. 7 is a view showing an example of the vibration of the panel 10 of the electronic device 1
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according to the second embodiment. In the electronic device 1 according to the second
embodiment, the panel 10 is an acrylic plate having a rigidity lower than that of the glass plate,
and the display unit 20 is not adhered to the back surface of the panel 10. The amplitude
generated by the piezoelectric element 30 is larger than that of the electronic device 1 according
to the first embodiment. Moreover, the panel 10 vibrates not only in the attachment area where
the piezoelectric element 30 is attached but also in an area away from the attachment area.
Therefore, in addition to airborne sound through the air, the user can touch the ear to an
arbitrary position of the panel 10 to hear human body vibration sound.
[0049]
Thus, according to the electronic device 1 according to the present embodiment, the reinforcing
member 80 and the panel 10 are deformed due to the deformation of the piezoelectric element
30 attached to the panel 10 via the reinforcing member 80, and the deformation is performed.
The air conduction sound and the human body vibration sound are transmitted to the object
contacting the panel 10. Thereby, the air conduction sound and the human body vibration sound
can be transmitted to the user without putting the vibrating body itself on the ear. Also, the
piezoelectric element 30 is attached to the surface of the panel 10 on the inner side of the
housing 60. Therefore, the air conduction sound and the human body vibration sound can be
transmitted to the user without causing the vibrating body to protrude from the outer surface of
the housing 60. Further, not only in the mounting area where the piezoelectric element 30 is
attached, but also in any part of the panel 10, deformation occurs in the panel 10 to transmit the
air conduction sound and the human body vibration sound. Therefore, in addition to airborne
sound through the air, the user can touch the ear to an arbitrary position of the panel 10 to hear
human body vibration sound.
[0050]
Further, by arranging the reinforcing member 80 between the piezoelectric element 30 and the
panel 10, for example, when an external force is applied to the panel 10, the external force may
be transmitted to the piezoelectric element 30 and the piezoelectric element 30 may be damaged.
It can be reduced. Further, even if the panel 10 is in strong contact with the human body, the
vibration of the panel 10 can be hardly damped. Further, by arranging the reinforcing member
80 between the piezoelectric element 30 and the panel 10, the resonance frequency of the panel
10 is lowered, and the acoustic characteristics in the low frequency band are improved. In place
of the reinforcing member 80, a plate-like weight may be attached to the piezoelectric element
30 by the joining member 70.
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[0051]
Although the present invention has been described based on the drawings and examples, it
should be noted that those skilled in the art can easily make various changes and modifications
based on the present disclosure. Therefore, it should be noted that these variations and
modifications are included in the scope of the present invention. For example, it is possible to
rearrange the components, the functions included in each step, etc. so as not to be logically
contradictory, and it is possible to combine or divide a plurality of components or steps into one.
is there.
[0052]
For example, as shown in FIG. 8, the panel 10 may be joined to the housing 60 by the joining
member 70. As described above, by making it difficult for the vibration from the panel 10 to be
transmitted directly to the housing 60, the risk of the user dropping the electronic device 1 can
be reduced as compared with the case where the housing itself vibrates largely. Further, the
bonding member 70 can be made of a non-heat curable adhesive. This has the advantage that
thermal stress shrinkage is less likely to occur between the housing 60 and the panel 10 during
curing. Further, the bonding member 70 can be a double-sided tape. As a result, there is an
advantage that contraction stress as in the use of an adhesive is less likely to occur between the
housing 60 and the panel 10.
[0053]
For example, when the panel 10 and the display unit 20 do not overlap, the piezoelectric element
30 may be disposed at the center of the panel 10. When the piezoelectric element 30 is disposed
at the center of the panel 10, the vibration of the piezoelectric element 30 is uniformly
transmitted to the entire panel 10 to improve the quality of the air conduction sound, or the user
can listen to various positions of the panel 10 Even if it makes contact with the human body, the
human body vibration noise can be recognized. As in the above-described embodiment, a
plurality of piezoelectric elements 30 may be mounted.
[0054]
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17
Further, the panel 10 can constitute part or all of any of a display panel, an operation panel, and
a cover panel. In particular, when the panel 10 is a display panel, the piezoelectric element 30 is
disposed outside the display area for the display function. This has the advantage of being less
likely to interfere with the display. The operation panel includes the touch panel of the first
embodiment. Further, the operation panel includes, for example, a sheet key which is a member
which is integrally formed on a key top of operation keys in a foldable type portable telephone
and which constitutes one surface of an operation unit side housing.
[0055]
In the first and second embodiments, the joint member 70 for bonding the panel 10 and the
piezoelectric element 30 and the joint member for bonding the panel 10 and the housing 60
have the same reference numerals. As described. However, as the joining members used in the
first embodiment and the second embodiment, different ones may be used as appropriate
depending on the members to be joined.
[0056]
Furthermore, in the first embodiment and the second embodiment, the case where the cover 66
for sealing the opening for taking in and out the battery is coupled to the housing 60 is an
example of the claw 66 and the engaging part 67. As shown. However, even if the claw portion
66 and the engagement portion 67 are for coupling a lid other than a battery, for example, a
storage medium or circuit component, a terminal for attaching / detaching a power plug or the
like, or a cover for sealing an opening. Alternatively, other peripheral devices may be coupled to
the housing 60.
[0057]
DESCRIPTION OF SYMBOLS 1 electronic device 10 panel 20 display part 30 piezoelectric
element 40 input part 50 control part 60 housing | casing 70 joining member 80 reinforcement
member 90 support part
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