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JP2013239857

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2013239857
Abstract: The present invention provides an electronic device capable of efficiently suppressing a
decrease in sound pressure and an increase in distortion factor. A piezoelectric element (30), a
panel (10) supporting the piezoelectric element (30), and a housing (60) holding the panel (10) A
shock absorbing material 90 is disposed between the panel 10 and the housing 60 in the
electronic device 1 that generates vibration noise to be transmitted. [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 bone conduction sound to a user by transmitting the vibration of the
panel to a human body. It relates to the equipment.
[0002]
Patent Document 1 describes an electronic device such as a mobile phone terminal that transmits
air conduction 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. Further, 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 bone conduction 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 terminal.
Therefore, it is necessary to hit a small vibrating body protruding from the outer surface of the
housing to the ear, which may be inconvenient. Therefore, by placing the vibrating body on the
back (inner surface) of the panel of a mobile phone terminal etc. and deforming the panel due to
the deformation of the vibrating body, the air conducted sound to the object (ear) contacting the
panel It is assumed that the bone conduction sound is transmitted.
[0006]
However, in Patent Document 1 described above, the various problems that occur when the
panel is deformed have not been studied at all.
[0007]
An object of the present invention is to solve the problem in an electronic device that vibrates a
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panel and to provide a good electronic device.
[0008]
An electronic device according to the present invention includes a piezoelectric element, a panel
for supporting the piezoelectric element, and a case for holding the panel, and the panel vibrates
and transmits an air conduction sound and a part of a human body. In an electronic device that
generates sound, a buffer material is disposed between the panel and the housing.
[0009]
Both the piezoelectric element and the buffer material may be disposed at one end side in one
direction in a plan view of the panel.
[0010]
The buffer material may become thinner as it goes away from the piezoelectric element in the
direction of the other end.
[0011]
The cushioning material may be adhered to only one of the panel and the housing.
[0012]
The housing may include a sheet metal as an insert member.
[0013]
The piezoelectric element may have a rectangular shape in a plan view, and the cushioning
material may be disposed outside the end in the longitudinal direction of the piezoelectric
element.
[0014]
The case may be configured of a first case portion, and a second case portion located inside the
first case portion and including the sheet metal.
[0015]
The buffer material may be disposed in the other end direction in the one direction of the panel
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than the piezoelectric element.
[0016]
The display unit may be held by the panel, and the buffer material may be in contact with the
display unit.
[0017]
The buffer material may be in a pressed state before the vibration of the piezoelectric element.
[0018]
The housing may have a rectangular shape in a plan view, and the length of one of the two
opposing sides may be equal to or greater than the length from the anti tragus to the anti anulus
lower leg.
[0019]
In the housing, the length of the other two opposing sides may be equal to or greater than the
length from the tragus to the ankle.
[0020]
The piezoelectric element may be bonded and fixed to the housing by a bonding member.
[0021]
The bonding member may be a non-heating curable adhesive.
[0022]
The joining member may be a double-sided tape.
[0023]
The panel may be joined to the housing by a joining member.
[0024]
The bonding member for bonding the panel to the housing may be a non-heat curable adhesive.
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[0025]
The joining member for joining the panel to the housing may be a double-sided tape.
[0026]
The panel may constitute any or all of a display unit, an input unit, and a cover of the display
unit.
[0027]
The fixed portion of the piezoelectric element in the panel may be located outside an overlapping
area with the display unit in a plan view of the panel.
[0028]
The display unit may be fixed to the panel from the inside of the housing.
[0029]
ADVANTAGE OF THE INVENTION According to this invention, the subject in the electronic device
which vibrates a panel is solved, and a favorable electronic device can be provided.
[0030]
It is a figure which shows the functional block of the principal part 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 roughly the principal part of 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.
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It is a figure which shows the frequency characteristic regarding the sound pressure of the
electronic device which concerns on 1st Embodiment.
It is a figure which shows the frequency characteristic regarding the distortion factor of the
electronic device which concerns on 1st Embodiment.
It is a figure which shows roughly the principal part of 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.
[0031]
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 main parts of an electronic device 1 according to
an embodiment of the present invention.
The electronic device 1 is, for example, a mobile phone terminal, and includes a wireless
communication unit 5, a panel 10, a display unit 20, a piezoelectric element 30, an input unit 40,
and a control unit 50.
The wireless communication unit 5 has a known configuration, and is wirelessly connected to a
communication network via a base station or the like.
[0032]
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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 method (or an ultrasonic method), an infrared method, an
electromagnetic induction method, and a load detection method can be used.
[0033]
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 side of the panel 10.
For example, the display unit 20 is disposed on the back surface of the panel 10 by a bonding
member (for example, an adhesive).
Alternatively, the display unit 20 is separated from the panel 10 and supported by the housing of
the electronic device 1.
[0034]
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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.
The unimorph stretches when an electrical signal (voltage) is applied, and the bimorph bends
when an electrical signal (voltage) is applied.
[0035]
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 by a predetermined distance in a state of being
disposed on the back surface of the panel 10. The piezoelectric element 30 may be separated
from the surface on the inner side of the housing 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 side of the housing may be larger than the maximum amount of
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deformation of the piezoelectric element 30.
[0036]
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.
[0037]
The control unit 50 is a processor that controls the electronic device 1. The control unit 50
applies, to the piezoelectric element 30, a predetermined electric signal (a sound according to the
other party of the call, or a voltage according to an audio signal such as a ring tone or music
including music). The sound signal may be based on music data stored in the internal memory, or
music data stored in an external server or the like may be reproduced via a network.
[0038]
When an electrical signal is applied 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 in accordance with the expansion or contraction
or bending of the piezoelectric element 30, and the panel 10 bends and vibrates. Here, the
maximum voltage of the electric signal applied to the piezoelectric element 30 by the control unit
50 is, for example, higher than ± 5 V, which is an applied voltage of a so-called panel speaker
for the purpose of sound conduction by air conduction sound instead of vibration sound. , ±
15V. Thus, even when the user presses the panel 10 against his / her body with a force of 3 N or
more (5 N to 10 N, for example), the panel 10 generates sufficient bending vibration to cause the
user's body to Vibration noise can be generated through a part (for example, the cartilage of the
outer ear). 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.
[0039]
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The panel 10 bends and 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 maximum voltage applied
may be ± 15V. Therefore, the user can hear the sound by bringing the ear into contact with the
area apart from the mounting area of the piezoelectric element 30 described above, for example,
the central portion of the panel 10.
[0040]
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. The region having the above 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 (1992-1994) 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.
[0041]
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10
The electronic device 1 described above can transmit the air conduction sound and the 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.
[0042]
In addition, since the electronic device 1 described above transmits the vibration sound by the
vibration of the panel 10, for example, even if the user wears earphones or headphones, the user
can contact the electronic device 1 by contacting them. You can hear the sound through
headphones and body parts.
[0043]
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
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®.
[0044]
First Embodiment FIG. 3 is a view schematically showing a main part of a mounting structure of
an electronic device 1 according to a first embodiment. Fig.3 (a) is a front view, FIG.3 (b) is
sectional drawing along the bb line in FIG. 3 (a). FIG. 3 (c) is a cross-sectional view taken along
the line c-c in FIG. 3 (a). The electronic device 1 illustrated in FIG. 3 is a smartphone in which a
substantially rectangular glass plate in a plan view is disposed on the front surface of a housing
60 (for example, a case of metal or resin) as the panel 10.
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[0045]
The panel 10 constitutes, for example, a capacitive touch panel, and is supported (held) by the
housing 60 via the bonding member 70. The display unit 20 is joined to the panel 10 via a
joining member 70 on the back surface except for the upper part on one end side in the
longitudinal direction which is one direction in plan view. In addition, the piezoelectric element
30 is bonded to the upper rear surface at one end side in the longitudinal direction of the panel
10 via the bonding member 70 and supported by the panel 10. That is, as shown in FIG. 3A, the
fixed portion of the piezoelectric element 30 is located outside the overlapping area of the panel
10 and the display unit 20 in plan view. The piezoelectric element 30 has a substantially
rectangular shape in a plan view, and is joined such that the long side thereof is along the short
side of the panel 10. The bonding member 70 is an adhesive having a thermosetting property, an
ultraviolet ray curing property, or the like, 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.
[0046]
FIG. 4 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. For this reason, the other end side of the panel 10
is less likely to vibrate as compared with one end side (hereinafter also referred to as a main
vibration portion) of the panel 10 to which the piezoelectric element 30 is attached. Therefore,
sound leakage due to the vibration of the other end side of the panel 10 can be reduced at the
other end side of the panel 10.
[0047]
In FIG. 3, the input unit 40 is supported by the housing 60 at the other end side of the panel 10
in the longitudinal direction. Further, in the input unit 40, as shown by a broken line, a
mouthpiece 41 of a microphone is formed. That is, the piezoelectric element 30 is disposed in the
upper portion on one end side of the substantially rectangular casing 60, and the mouthpiece 41
is formed in the lower portion on the other end side.
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[0048]
The housing 60 includes a rear case (first housing portion) 62 and a front case (second housing
portion) 61 located inside the rear case. The rear case 62 is detachable with respect to the front
case 61. The front case 61 is configured to have a recess 63. Similarly, the rear case 62 is
configured to have a recess 64. The front case 61 and the rear case 62 are not limited to the
concave shape, and can be configured in any suitable shape.
[0049]
The front case 61 is configured to include a sheet metal 80 which is an insert member. The panel
10, the display unit 20, the piezoelectric element 30, and the input unit 40 are disposed in the
recess 63 of the front case 61.
[0050]
A shock absorbing material 90 is disposed between the display unit 20 and the sheet metal 80.
The shock absorbing material 90 reduces the interference of the display unit 20 which is bent
and vibrated with the vibration of the piezoelectric element 30 with the sheet metal 80 (contact
with the sheet metal 80). That is, the shock absorbing material 90 is disposed between the panel
10 and the front case 61 which is a part of the housing, and the interference between the panel
10 and the front case 61 is reduced. The buffer material is a substance of SCF (Super Critical
Fluid), a foam material or the like, and is, for example, a sponge or a foam polystyrene.
[0051]
The shock absorbing material 90 is bonded to the display unit 20 via the bonding member 70.
Moreover, the shock absorbing material 90 is in contact with the sheet metal 80 without
interposing the joining member. The buffer material 90 and the sheet metal 80 may have a gap
between the buffer material 90 and the sheet metal 80 without contacting with each other.
Moreover, the shock absorbing material 90 is not limited to joining to the display part 20 instead
of the sheet metal 80, The shock absorbing material 90 may be adhere | attached only to either
one of the display part 20 and the sheet metal 80. FIG.
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[0052]
The thickness of the shock absorbing material 90 can be set so as to become thinner as it goes
away from the piezoelectric element 30 in the direction of the other end, that is, as it gets away
from the main vibration part. The vibration decreases as the area is farther from the main
vibration portion, and the display unit 20 is less likely to contact the sheet metal 80, so the
buffer material 90 can be made thinner. Note that the display unit 20 and the sheet metal 80 are
not arranged in parallel as shown in FIG. 3B according to the shape of the buffer material 90, and
the display unit is moved away from the piezoelectric element 30 in the direction of the other
end. The electronic device 1 can also be configured such that the gap between the sheet 20 and
the sheet metal 80 is reduced.
[0053]
When the thickness of the shock absorbing material 90 is larger than the gap between the
display unit 20 and the sheet metal 80, the shock absorbing material 90 is disposed between the
display unit 20 and the sheet metal 80 in a pressed state before the vibration of the piezoelectric
element 30. Ru. The pressed state means a state in which the shock absorbing material 90 is
compressed and deformed. In addition, when the thickness of the shock absorbing material 90 is
the same as the gap between the display unit 20 and the metal plate 80, the shock absorbing
material 90 may be disposed between the display unit 20 and the metal plate 80 without
compression. it can.
[0054]
In the present embodiment, the cushioning material 90 is disposed on one end side in the same
manner as the piezoelectric element 30 disposed on the one end side in the longitudinal direction
of the panel 10. That is, as shown in FIG. 3A, the buffer material 90 is disposed around the
piezoelectric element 30.
[0055]
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Further, in the present embodiment, the buffer material 90 is disposed outside the end in the
longitudinal direction of the piezoelectric element 30. That is, as shown in FIG. 3A, the buffer
material 90 is disposed on the outer peripheral side of the panel 10 with respect to the
piezoelectric element 30 in the longitudinal direction of the piezoelectric element 30.
[0056]
Further, in the present embodiment, the buffer material 90 is disposed in the other end direction
in one direction (longitudinal direction) of the panel 10 rather than the piezoelectric element 30.
That is, as shown in FIG. 3A, the buffer material 90 is disposed on the side of the input unit 40
disposed on the other end side of the piezoelectric element 30.
[0057]
Various electronic components are disposed between the bottom of the recess 63 of the front
case 61 and the bottom of the recess 64 of the rear case 62. In FIG. 3B, a circuit board 130
incorporating electronic components (processor, memory, etc.) necessary to realize the function
of the control unit 50, and a battery (battery) 150 for driving the electronic device 1 are
provided. , In the recess 64.
[0058]
FIG. 5 is a diagram showing frequency characteristics of the sound pressure of the electronic
device 1 according to the first embodiment. In FIG. 5, the frequency characteristic 170 when the
shock absorbing material 90 is not disposed between the display unit 20 and the sheet metal 80,
and the frequency when the shock absorbing material 90 is disposed between the display unit 20
and the sheet metal 80 Characteristics 171 are shown respectively. The horizontal axis
represents frequency [Hz], and the vertical axis represents A characteristic sound pressure level
[dBA]. As shown in FIG. 5, for example, in the frequency band of 300 to 1000 Hz, the sound
pressure level is increased by approximately 5 to 10 dBA due to the arrangement of the buffer
material 90.
[0059]
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FIG. 6 is a diagram showing frequency characteristics regarding the distortion factor of the
electronic device 1 according to the first embodiment. The distortion factor represents the degree
of distortion of the vibration waveform, and is defined as the ratio of harmonics to the
fundamental wave. The smaller the distortion factor, the smaller the ratio of harmonics to the
fundamental wave, and the better the sound quality. In FIG. 6, the frequency characteristic 180
when the shock absorbing material 90 is not disposed between the display unit 20 and the sheet
metal 80, and the frequency when the shock absorbing material 90 is disposed between the
display unit 20 and the sheet metal 80 Characteristics 181 are shown respectively. The
horizontal axis represents frequency [Hz] and the vertical axis represents distortion factor [%]. As
shown in FIG. 6, for example, in the frequency band of 300 to 1000 Hz, the distortion factor is
reduced by about 4 to 24% due to the arrangement of the buffer material 90.
[0060]
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 longitudinal direction in which the piezoelectric element 30
is adhered Sufficiently vibrate from one end side of the Therefore, the user brings in a part of the
user's body (for example, the cartilage of the outer ear) to at least a part of the region from the
center to the upper part of the panel 10 to cause air conduction noise and vibration due to the
vibration of the panel 10 I can hear the sound. As a result, air conduction noise and vibration
noise can be transmitted to the user without causing the vibrating body to protrude to the outer
surface of the housing 60, so that a very small vibrating body is brought into contact with the
human body as compared to the housing. The usability is improved more than the electronic
device described in 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.
[0061]
Further, in the present embodiment, the display unit 20 and the piezoelectric element 30 are
joined to the panel 10 by the joining 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
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curable adhesive. Thereby, there is an advantage that thermal stress contraction is less likely to
occur between the display unit 20 and 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 a contraction stress as in the use of an adhesive is unlikely to be applied between
the display unit 20 and the piezoelectric element 30 and the panel 10. In addition, since the
panel 10 is also joined to the housing 60 by the joining member 70, the same effect can be
obtained.
[0062]
Further, in the present embodiment, a shock absorbing material 90 is disposed between the
display unit 20 and the sheet metal 80. Thereby, it is possible to reduce the interference of the
display unit 20 which is bent and vibrated with the vibration of the piezoelectric element 30 with
the sheet metal 80. Therefore, it is possible to reduce the decrease in the sound pressure and the
increase in the distortion factor generated by the vibration of the panel 10. Since the interference
between the display unit 20 and the sheet metal 80 can be suppressed or reduced, the gap
between the display unit 20 and the sheet metal 80 can be reduced, and the electronic device 1
can be thinned.
[0063]
Further, in the present embodiment, both of the piezoelectric element 30 and the shock
absorbing material 90 are disposed at one end side in one direction in a plan view of the panel
10. Since the region (main vibration portion) of the panel 10 to which the piezoelectric element
30 is attached vibrates to the greatest extent, arranging the buffer material 90 on the same side
as the piezoelectric element 30 allows the display portion 20 and the sheet metal 80 to be
efficiently performed. Interference can be reduced or reduced.
[0064]
Further, in the present embodiment, the shock absorbing material 90 is adhered only to the
display unit 20 and is in contact with the sheet metal 80 only. By not adhering the shock
absorbing material 90 to both the display unit 20 and the sheet metal 80, the generation of
tension between the display unit 20 and the sheet metal 80 via the shock absorbing material 90
is prevented, and the bending vibration of the panel 10 is more than necessary. It is possible to
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reduce inhibition.
[0065]
Further, in the present embodiment, the front case 61 includes a sheet metal 80 as an insert
member. The sheet metal 80 can reduce the thickness while maintaining the strength of the
electronic device 1.
[0066]
Moreover, in the present embodiment, the shock absorbing material 90 is disposed outside the
end in the longitudinal direction of the piezoelectric element 30. The main vibration which is a
large vibration occurs inside the end of the piezoelectric element 30, and by disposing the buffer
member 90 on the outer side, it is possible to reduce unnecessary interference with the desired
vibration.
[0067]
Second Embodiment FIG. 7 is a view showing a mounting structure of an electronic device 1
according to a second embodiment. 7 (a) is a front view, FIG. 7 (b) is a cross-sectional view taken
along line bb in FIG. 7 (a), and FIG. 7 (c) is line cc in FIG. 7 (a). FIG. In the electronic device 1
shown in FIG. 7, a cover panel (acrylic plate) for protecting the display unit 20 as the panel 10 is
disposed on the front of the upper case 60a, and the input unit 40 is disposed on the lower case
60b. Mobile phone terminal. The display unit 20, the piezoelectric element 30, and the circuit
board 130 are disposed in the recess 65 of the housing 60a. In FIG. 7C, illustration of the
piezoelectric element 30 and the reinforcing member 100 which are visible between the two
buffer members 90 is omitted for the sake of clarity of the drawing.
[0068]
In the second embodiment, a reinforcing member 100 is disposed between the panel 10 and the
piezoelectric element 30. The reinforcing member 100 is, for example, a resin plate, a sheet
metal, or a resin plate containing glass fibers. That is, the electronic device 1 according to the
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second embodiment has a structure in which the piezoelectric element 30 and the reinforcing
member 100 are bonded by the bonding member 70, and the reinforcing member 100 and the
panel 10 are bonded by the bonding member 70.
[0069]
Further, in the second embodiment, the display unit 20 is not bonded to the panel 10, but is
supported by the housing 60a. 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
housing 60a are coupled to each other through the circuit board 130. In addition, it is possible to
comprise the case 60a so that a sheet metal may be included similarly to the front case 61 of 1st
Embodiment.
[0070]
A shock absorbing material 90 similar to that of the first embodiment is disposed between the
panel 10 and the display unit 20 (housing 60 a). The panel 10 and the shock absorbing material
90 are joined via the joining member 70, and the display unit 20 and the shock absorbing
material 90 are in contact without interposing the joining member. As in the first embodiment,
the panel 10 and the shock absorbing material 90 may be in contact with each other without the
bonding member, and the display unit 20 and the shock absorbing material 90 may be bonded
via the bonding member.
[0071]
FIG. 8 is a view showing an example of the vibration of the panel 10 of the electronic device 1
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 vibration sound.
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[0072]
As described above, according to the electronic device 1 according to the present embodiment,
the reinforcing member 100 and the panel 10 are deformed due to the deformation of the
piezoelectric element 30 attached to the panel 10 via the reinforcing member 100, and the
deformation is performed. The air conduction sound and the vibration sound are transmitted to
the object in contact with the panel 10. Thereby, the air conduction sound and the vibration
sound can be transmitted to the user without putting the vibrator itself on the ear. The
piezoelectric element 30 is attached to the surface of the panel 10 on the inner side of the
housing 60 a. Therefore, the air conduction noise and the vibration noise can be transmitted to
the user without causing the vibrating body to protrude from the outer surface of the housing
60a. In addition, deformation occurs in the panel 10 not only in the mounting area where the
piezoelectric element 30 is attached, but also in any portion of the panel 10 for transmitting the
air conduction sound and the 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 vibration
sound.
[0073]
Further, in the present embodiment, by arranging the reinforcing member 100 between the
piezoelectric element 30 and the panel 10, for example, when an external force is applied to the
panel 10, the external force is transmitted to the piezoelectric element 30, and the piezoelectric
element 30 The possibility of breakage 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 100 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 100, a plate-like weight may
be attached to the piezoelectric element 30 by the joining member 70.
[0074]
Also, in the present embodiment, a shock absorbing material 90 is disposed between the panel
10 and the display unit 20. Thereby, interference with the display unit 20 of the panel 10 that is
bent and vibrated with the vibration of the piezoelectric element 30 can be reduced.
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[0075]
Further, in the present embodiment, the shock absorbing material 90 adheres only to the panel
10 and is in contact with the display unit 20 only. By not adhering the shock absorbing material
90 to both the panel 10 and the display unit 20, generation of tension between the panel 10 and
the display unit 20 via the shock absorbing material 90 is prevented, and bending vibration of
the panel 10 is unnecessarily increased. It is possible to reduce inhibition.
[0076]
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.
[0077]
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 The vibration noise can be recognized even by
touching it. A plurality of piezoelectric elements 30 may be mounted.
[0078]
Moreover, in the above-described electronic device 1, the piezoelectric element 30 is attached to
the panel 10, but may be attached to a place different from the panel 10. For example, in the first
embodiment, the piezoelectric element 30 may be attached to the rear case 62 attached to the
housing 60 and covering the battery 150. Since the rear case 62 is often attached to a surface
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21
different from the panel 10 in the electronic device 1 such as a mobile phone terminal, according
to such a configuration, the user can use a part of the body (e.g. You can hear the sound by
touching). In this case, the shock absorbing material 90 is disposed between the rear case 62
which is bent and vibrated by the piezoelectric element 30 and a portion (for example, the
battery 150) which can contact the rear case 62.
[0079]
In addition, the panel 10 can constitute any or all of a display panel, an operation panel, a cover
panel, and a lid panel for making a rechargeable battery removable. 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 the key top of
the operation key in the folding type portable telephone terminal and which constitutes one
surface of the operation unit side case.
[0080]
In the first embodiment and the second embodiment, the bonding members for bonding the
panel 10 and the piezoelectric element 30 and the bonding members for bonding the panel 10
and the housing 60 (60a) have the same reference numerals. It demonstrated as the joining
member 70. FIG. 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.
[0081]
REFERENCE SIGNS LIST 1 electronic device 5 wireless communication unit 10 panel 20 display
unit 30 piezoelectric element 40 input unit 41 mouthpiece 50 control unit 60, 60 a, 60 b
housing 61 front case (second housing portion) 62 rear case (first housing) Part) 63, 64, 65
Recess 70 Bonding member 80 Sheet metal 90 Buffer material 100 Reinforcement member 130
Circuit board 150 Battery
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