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JP2013219584

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DESCRIPTION JP2013219584
Abstract: An electronic device using a large size vibrator is appropriately used. The electronic
device includes a piezoelectric element, a diaphragm fixed to the piezoelectric element, and
vibrating by the piezoelectric element to generate an air-conducted sound and an oscillating
sound transmitted by vibrating a part of a human body, A housing to which the diaphragm is
fixed and an operation key provided on the housing are provided to make it difficult for the
vibration of the diaphragm to be transmitted to the operation key. [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]
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
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1
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.
[0007]
In the electronic device according to the present invention, a piezoelectric element, a diaphragm
in which the piezoelectric element is fixed and which vibrates by the piezoelectric element to
generate air conducted sound and vibration sound transmitted by vibrating a part of a human
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2
body, the vibration It has a case where a board is fixed, and an operation key provided in the
case.
[0008]
The piezoelectric element is fixed near a first end in a plan view of the diaphragm, and the
operation key is on a second end side opposite to the first end in a plan view of the diaphragm
The housing may be provided in the housing.
[0009]
The electronic device may further include a display unit fixed to a region between the fixing
portion of the piezoelectric element on the diaphragm and the second end.
[0010]
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.
[0011]
The operation key may be embedded in an opening provided in the housing.
[0012]
The length in the second direction from the side to which the piezoelectric element is fixed to the
other side in a plan view of the diaphragm may be equal to or longer than the length from the
antitragus to the lower leg of the anulus.
[0013]
The length in the direction intersecting with the second direction in plan view of the diaphragm
may be equal to or greater than the length from the tragus to the ankle.
[0014]
The piezoelectric element may be bonded and fixed to the diaphragm by a bonding member.
[0015]
The bonding member may be a non-heating curable adhesive.
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[0016]
The joining member may be a double-sided tape.
[0017]
The diaphragm may be joined to the housing by a joining member.
[0018]
The bonding member may be a non-heating curable adhesive.
[0019]
The joining member may be a double-sided tape.
[0020]
The diaphragm may constitute a part or all of any of a display unit, an input unit, a cover of the
display unit, and a lid for making the battery removable.
[0021]
According to the present invention, it is possible to appropriately use an electronic device of a
type that vibrates a panel attached to a housing.
[0022]
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.
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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 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.
[0023]
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.
[0024]
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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.
[0025]
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.
[0026]
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
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(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.
[0027]
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.
[0028]
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.
[0029]
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
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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.
[0030]
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
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
[0031]
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, panel 10 vibrates
such that a portion where the amplitude of the vibration is relatively large and a portion where
the amplitude of the vibration is relatively small are randomly distributed substantially
throughout the 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 abovedescribed vibration of the panel 10 does not attenuate. The applied voltage may be ± 15V.
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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.
[0032]
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 longitudinal direction is the longitudinal direction 2a
in which the panel 10 extends in this example, and the piezoelectric element 30 is disposed
closer to one end from the center thereof. Moreover, the width direction is a direction 2h
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 (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.
[0033]
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.
[0034]
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.
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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.
[0035]
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.
[0036]
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®.
[0037]
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 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. The input unit 40 is an
operation key embedded in the opening 310 provided in the housing 60.
[0038]
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The operation key, which is the input unit 40, is a movable input means that causes an electrical
contact and generation of an input signal when pressed by the user. Therefore, the movable part
is allowed a certain amount of play. Then, for example, when the operation key is embedded in
the panel 10 with the opening provided, when the piezoelectric element 30 vibrates the panel 10,
the vibration of the panel 10 is transmitted to the operation key, and the operation key rattled.
There is a possibility that a sound may be generated or a call sound may leak. Therefore, in the
present embodiment, the operation key is provided not on the panel 10 side but on the housing
60 side, and the opening portion 310 is provided and embedded therein. By doing so, although
the vibration of the panel 10 is transmitted to the housing 60 to a certain extent through the
joint portion or the contact portion of the panel 10 and the housing 60, it is attenuated in the
path, so that the operation key can be shaken Effects of vibration can be reduced.
[0039]
Furthermore, the vibration transmitted through the housing 60 is attenuated according to the
distance from the piezoelectric element 30 that is the generation source. Therefore, assuming
that the piezoelectric element 30 is provided, for example, on the first end side (upper end side in
FIG. 3) 60a in the longitudinal direction 300 of the rectangular panel 10 in plan view, the
operation key is the first It is provided on the second end side (lower end side in FIG. 6) 60b
opposite to the end side 60a. Here, the first end side 60 a and the second end side 60 b are
divided, for example, at the middle point 302 of the length in the longitudinal direction 300 with
the lateral direction orthogonal to the longitudinal direction as the boundary 304. Then, in plan
view, the one including the fixed position of the piezoelectric element 30 corresponds to the first
end side 60a, and the other corresponds to the second end side 60b. When the piezoelectric
element 30 is disposed beyond the boundary 304, the side including half or more of the area of
the piezoelectric element 30 corresponds to the first end side 60a, and the other corresponds to
the second end side 60b. .
[0040]
As described above, by providing the operation key to the housing 60 on the lower side 60b
instead of the upper side 60a on which the piezoelectric element 30 is provided, it is transmitted
to the coupling portion 66 than when provided on the same upper side 60a as the piezoelectric
element 30. Vibration can be reduced. Therefore, the vibration transmitted to the operation key
can be suppressed more effectively.
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[0041]
The display unit 20 and the piezoelectric element 30 are each bonded to the panel 10 by a
bonding member 70. When bonding the display unit 20 to the panel 10, the bonding member 70
is preferably an adhesive having a thermosetting property or an ultraviolet curing property, for
example, an optical elastic resin which is a colorless and transparent acrylic ultraviolet curing
adhesive. By doing so, the display unit 20 can display various display contents through the panel
10. When the piezoelectric element 30 is bonded to the panel 10, the bonding member 70 is a
thermosetting or ultraviolet curable adhesive or a double-sided adhesive tape, and is, for
example, a colorless and transparent acrylic ultraviolet curable adhesive. It may be photoelastic
resin. The panel 10, the display unit 20, and the piezoelectric element 30 each have a
substantially rectangular shape.
[0042]
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.
[0043]
FIG. 4 is a view showing an example of the vibration of the panel 10 of the electronic device 1
according to the present 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. In addition, the display unit 20 is
provided between the position of the piezoelectric element 30 in the panel 10 and the position of
the input unit 40 as the operation key in the housing 60, so that the lower portion of the panel
10 contacts the housing 60. In the path in which the vibration is transmitted from the
piezoelectric element 30 to the input unit 40, the vibration can be efficiently attenuated.
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Therefore, rattling of the operation key of the input unit 40 can be suppressed.
[0044]
Further, 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 contacting the deformed panel 10 is The air conduction sound
and the 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 can not easily drop the terminal
as compared with the case where the case 60 is deformed instead of the panel 10 to generate the
vibration.
[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.
[0046]
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
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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.
[0047]
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. Then, on the case 60 side, an input unit 40 which is an operation key is provided.
[0048]
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. On the other hand, by
providing the operation key on the housing 60 side, it is possible to make it difficult for the
vibration of the panel 10 to be transmitted to the operation key.
[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
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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.
[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]
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15
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.
[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]
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.
[0055]
In addition, the panel 10 can constitute any or all of a display panel, an operation panel, a cover
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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.
[0056]
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.
[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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