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DESCRIPTION JP2014112917

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DESCRIPTION JP2014112917
Abstract: To reduce sound leakage from a vibrating plate vibrated by a piezoelectric element. An
electronic device (1) according to the present invention includes a piezoelectric element (30) and
a lid, and in the longitudinal direction of the piezoelectric element (30), a portion immediately
above the piezoelectric element (30) bulges the highest compared to its surroundings. The
electronic device 1 in which the lid is bent and the contact portion of the human body in contact
with the lid vibrates to transmit sound, and a signal obtained by cutting or attenuating at least a
part of frequency components higher than a predetermined threshold The piezoelectric element
30 is vibrated by using it. [Selected figure] Figure 1
Electronics
[0001]
The present invention vibrates the panel by applying a predetermined electrical signal
(reproduction sound signal) to the piezoelectric element, and transmits the air conduction sound
and the human body vibration sound to the user by transmitting the vibration of the panel to the
human body. It relates to an electronic device.
[0002]
Patent Document 1 describes an electronic device such as a mobile phone that transmits airconduction sound and bone-conduction sound to a user.
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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]
The electronic device described in Patent Document 1 does not consider measures for the case
where the housing of the telephone vibrates due to the vibrator and sound leaks from the outer
surface of the housing.
[0006]
An object of the present invention is to provide an electronic device capable of reducing sound
leakage from a diaphragm vibrated by a piezoelectric element.
[0007]
The electronic device according to the present invention includes a piezoelectric element and a
lid, and the lid is bent so that the area immediately above the piezoelectric element is raised most
in the longitudinal direction of the piezoelectric element compared to its surroundings. An
electronic device in which a contact portion of a human body in contact with a lid vibrates to
transmit a sound, and vibrates the piezoelectric element using a signal obtained by cutting or
attenuating at least a part of frequency components higher than a predetermined threshold. Let
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[0008]
Preferably, the battery further comprises a lid that covers the battery.
[0009]
The electronic device according to the present invention comprises a piezoelectric element and a
housing, and the housing is bent so that the position immediately above the piezoelectric element
is raised most in the longitudinal direction of the piezoelectric element compared to its
surroundings. An electronic device in which a contact portion of a human body in contact with
the casing vibrates to transmit a sound, and the piezoelectric is used by using a signal obtained
by cutting or attenuating at least a part of a frequency component higher than a predetermined
threshold. The element is vibrated.
[0010]
According to the electronic device of the present invention, it is possible to reduce the sound
leakage from the vibrating plate vibrated by the piezoelectric element.
[0011]
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 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.
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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.
It is a figure which shows an example of the sound leakage characteristic of each receiver. It is a
figure which shows an example of the filter characteristic used for sound leak reduction.
[0012]
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.
[0013]
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 functions as a vibrating plate vibrated by the piezoelectric element
30. 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.
[0014]
The display unit 20 is a display device such as a liquid crystal display, an organic EL display, or
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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.
[0015]
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.
[0016]
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
side of the housing 60 may be larger than the maximum amount of deformation of the
piezoelectric element 30.
[0017]
The input unit 40 receives an operation input from the user, and includes, for example, operation
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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.
[0018]
The control unit 50 is a processor that controls the electronic device 1. The control unit 50
applies a predetermined electric signal (voltage according to the reproduction sound 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 socalled 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. 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 the reproduction sound
signal according to the voice of the other party of communication, and generate air conduction
sound and human body vibration sound corresponding to the reproduction sound signal. . The
reproduction sound signal may be related to a ringing melody, a music including music, or the
like. Note that the reproduction sound signal relating to the electric 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. It may be.
[0019]
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
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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.
[0020]
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.
[0021]
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.
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[0022]
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.
[0023]
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®.
[0024]
In the electronic device 1 described above, the control unit 50 can vibrate the piezoelectric
element using the processing sound signal obtained by cutting or attenuating at least a part of
the frequency component higher than the predetermined threshold among the reproduction
sound signal. . That is, the electronic device 1 can reduce or suppress the vibration of the
piezoelectric element 30 at a frequency higher than a predetermined threshold value in the
reproduced sound signal. This is because, in a piezoelectric receiver in which the panel 10 is
vibrated by the piezoelectric element 30, the amount of sound leakage in high frequency
components is larger than that in a general dynamic receiver. FIG. 8 is a diagram showing an
example of the sound leakage characteristic of each receiver. As illustrated, in the piezoelectric
receiver, the amount of sound leakage is large particularly at high frequency components of 2
kHz or more, as compared with the dynamic receiver. Therefore, the control unit 50 can vibrate
the piezoelectric element 30 using a processed sound signal obtained by cutting or attenuating at
least a part of frequency components higher than 2 kHz, for example, among the reproduced
sound signal. As a result, it is possible to reduce the amount of vibration of the piezoelectric
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element 30 and to suppress the sound leakage particularly in a high frequency where the sound
leakage easily occurs. It is needless to say that the predetermined threshold value is not limited
to 2 kHz because the sound leakage characteristic changes in accordance with the configuration
of the electronic device 1. For example, the reproduction sound signal according to the voice call
includes sounds of frequencies from 0.4 kHz to 3.4 kHz, and the predetermined threshold can be
set to a value between 0.4 kHz and 3.4 kHz. As a result, it is possible to reduce the sound leakage
while satisfying the reception characteristics.
[0025]
In addition, the control unit 50 can generate the processed sound signal by gradually or stepwise
increasing the attenuation rate to the reproduced sound signal as the frequency becomes higher.
That is, in the electronic device 1, the vibration of the frequency component higher than the
predetermined threshold value of the reproduction sound signal decreases gradually or stepwise
as the frequency increases, as compared to the case where the reproduction sound signal is
vibrated. Become. As a result, the amount of vibration of the piezoelectric element 30 is reduced
as the high frequency sound that is particularly susceptible to sound leakage is reduced, so that
the sound leakage can be effectively suppressed.
[0026]
In addition, the control unit 50 may not cut or attenuate frequency components lower than or
equal to the predetermined threshold value. That is, the electronic device 1 may not reduce or
suppress the vibration due to the frequency equal to or lower than the threshold. As a result,
frequency components with little sound leakage can be reproduced as air conduction sound and
bone conduction sound without reducing the amount of vibration of the piezoelectric element 30.
[0027]
Note that the electronic device 1 may include a filter, and at least a part of frequency
components higher than a predetermined threshold may be cut or attenuated by the filter. FIG. 9
is a view showing an example of filter characteristics used for sound leakage reduction. The filter
characteristics shown in FIG. 9 correspond to the sound leakage characteristics of the
piezoelectric receiver shown in FIG. The filter is set such that the attenuation amount of the
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reproduced sound signal increases as the frequency becomes higher in a frequency range of 2
kHz or more. Further, the filter does not cut or attenuate the reproduced sound signal in a
frequency range of less than 2 kHz. By using such a filter, it is possible to reduce sound leakage
while satisfying the reception characteristics. 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) is sectional drawing along the bb line in FIG. 3 (a). 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. The panel
10 and the input unit 40 are supported by the housing 60, and the display unit 20 and the
piezoelectric element 30 are bonded to the panel 10 by the bonding members 70, respectively.
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.
[0028]
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
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.
[0029]
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. 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.
[0030]
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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. 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. Further, when the panel 10 is vibrated,
the user is less likely to drop the terminal, as compared with the case where the case 60 is
deformed instead of the panel 10 to generate the vibration.
[0031]
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. Second Embodiment FIG. 5 is a view showing a
mounting structure of an electronic device 1 according to a second embodiment. 5 (a) is a front
view, FIG. 5 (b) is a cross-sectional view taken along the line b-b in FIG. 5 (a), and FIG. 5 (c) is
taken along the line c-c in FIG. 5 (a) FIG. The electronic device 1 shown in FIG. 5 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. 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
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metal, resin, etc. FIG.
[0032]
FIG. 6 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 human body vibration sound.
[0033]
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 in
contact with 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.
[0034]
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
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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.
[0035]
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.
[0036]
For example, as shown in FIG. 7, 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.
[0037]
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
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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.
[0038]
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, the
piezoelectric element 30 may be attached to the battery lid attached to the housing 60 and
covering the battery. Since the battery lid is often attached to a surface different from the panel
10 in the electronic device 1 such as a portable telephone, according to such a configuration, the
user can use a part of the body (for example, an ear) on the surface different from the panel 10
You can hear it by touching it.
[0039]
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 a key top of
operation keys in a foldable type portable telephone and which constitutes one surface of an
operation unit side housing.
[0040]
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.
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[0041]
DESCRIPTION OF SYMBOLS 1 electronic device 10 panel (diaphragm) 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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