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JPWO2013145739

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DESCRIPTION JPWO2013145739
Adjust the frequency characteristics of air conduction noise and human vibration noise. The
electronic device 1 according to the present invention includes a panel 10, a piezoelectric
element 30, a housing 60 to which the panel 10 is attached, and a member 80 attached to the
piezoelectric element 30, and the deformation of the piezoelectric element 30 is caused. Then,
the member 80 and the panel 10 are deformed, and the air conduction sound and the human
body vibration sound are transmitted to the object contacting the deformed panel 10, and the air
conductive sound and the human body vibration sound are transmitted by the member 80. And
the frequency characteristics are adjusted.
Electronic equipment, panel unit Cross reference to related applications
[0001]
This application claims the priority of Japanese Patent Application 2012-076914 (filed on March
29, 2012) and Japanese Patent Application 2012-077674 (filed on March 29, 2012), The entire
disclosure of the application is incorporated herein by reference.
[0002]
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.
[0003]
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1
Patent Document 1 describes an electronic device such as a mobile phone that transmits airconduction sound and bone-conduction sound to a user.
Further, in Patent Document 1, air conduction sound is a sound transmitted to the eardrum by
the vibration of the air caused by the vibration of the object through the ear canal and vibrating
the eardrum. Have been described.
Further, Patent Document 1 describes that the human body vibration sound is a sound
transmitted to the user's auditory nerve through a part of the user's body (for example, the
cartilage of the outer ear) contacting the vibrating object. ing.
[0004]
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.
[0005]
JP 2005-348193 A
[0006]
The electronic device described in Patent Document 1 does not consider adjusting the frequency
characteristics of the air conduction sound and the human body vibration sound.
[0007]
An object of the present invention is to provide an electronic device capable of adjusting
frequency characteristics of air conduction sound and human body vibration sound.
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[0008]
An electronic device according to the present invention includes a panel, a piezoelectric element,
a housing to which the panel is attached, and a member attached to the piezoelectric element,
and the member and the panel are obtained by deformation of the piezoelectric element. An air
conduction sound and a human body vibrational sound are transmitted to an object which is
deformed and comes into contact with the panel to be deformed, and the frequency
characteristics of the airborne sound and the human body vibrational sound are adjusted by the
member. .
[0009]
The dip of the frequency characteristic of the air conduction sound and the human body
vibration sound may be out of the frequency band of the sound in which the use of the electronic
device is assumed by the member.
[0010]
The member may be disposed between the panel and the piezoelectric element, and the
piezoelectric element and the member may be joined by a first joining member.
[0011]
The member may be made of glass fiber and resin, or metal fiber and resin, or carbon fiber and
resin.
[0012]
The panel vibrates in a region wider than a region having a length corresponding to the distance
from the infraannular leg of the human ear to the antitragus and a width corresponding to the
distance from the tragus to the antihelix You may
[0013]
The member may be joined to the panel by a second joining member.
[0014]
The first bonding member may be a non-heat curable adhesive.
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[0015]
The first bonding member may be a double-sided tape.
[0016]
The second bonding member may be a non-heat curable adhesive.
[0017]
The second bonding member may be a double-sided tape.
[0018]
The panel may be joined to the housing by a third joining member.
[0019]
The third bonding member may be a non-heat curable adhesive.
[0020]
The third bonding member may be a double-sided tape.
[0021]
The panel may constitute part or all of a display panel, an operation panel, a cover panel, and a
lid panel for making a rechargeable battery removable.
[0022]
When the panel is a display panel, the piezoelectric element may be disposed outside a display
area for the display function.
[0023]
The panel may generate a deformation for transmitting the air conduction sound and the human
body vibration sound at any part of the panel.
[0024]
The panel has a plurality of points vibrating in a direction crossing the main surface of the panel
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in the vibration area, and in each of the points, the value of the amplitude of the vibration
changes from positive to negative with time or vice versa May vary.
[0025]
The member may be made of metal.
[0026]
The panel unit according to the present invention comprises a panel, a piezoelectric element, and
a member attached to the piezoelectric element, and the member and the panel deform due to
the deformation of the piezoelectric element, and the panel contacts the deformed panel The air
conduction sound and the human body vibrational sound are transmitted to the target object,
and the frequency characteristics of the airborne sound and the human body vibrational sound
are adjusted by the member.
[0027]
The member may be made of metal.
[0028]
According to the electronic device of the present invention, it is possible to adjust the frequency
characteristics of the air conduction sound and the human body vibration sound.
[0029]
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
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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 change of the frequency characteristic by an
adjustment member.
It is a figure which shows the example of joining of a panel and a housing | casing.
[0030]
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.
[0031]
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.
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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.
[0032]
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 bonded to the panel 10 by a bonding member (for example, an
adhesive), or may be disposed apart from the panel 10 and supported by the housing of the
electronic device 1.
[0033]
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 unimorph element in which unimorphs
are laminated (for example, 16 layers or 24 layers) or a laminated bimorph element in which
bimorphs are laminated (for example, 16 layers or 24 layers).
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.
[0034]
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 adjustment member (for
example, a sheet metal or glass fiber and resin, metal fiber and resin, carbon fiber and resin, etc.)
for adjusting the frequency characteristic of sound. . 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
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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.
[0035]
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.
[0036]
The control unit 50 is a processor that controls the electronic device 1. The control unit 50
applies a predetermined electric signal (a voltage corresponding to the audio signal) to the
piezoelectric element 30. The voltage applied to the piezoelectric element 30 by the control unit
50 is, for example, ± 15 V, which is higher than ± 5 V that is an applied voltage of a so-called
panel speaker aiming to conduct sound by air conduction sound instead of human body vibration
sound. May be there. As a result, even if the user presses the panel 10 against his / her body with
a force of, for example, 3N or more (5N to 10N), 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. The panel 10
is curved by the expansion or contraction or bending of the piezoelectric element 30. The panel
10 is bent directly by the piezoelectric element 30. “The panel 10 is directly bent by the
piezoelectric element” means that the panel is specified by the inertia force of the piezoelectric
actuator configured by arranging the piezoelectric element in the casing as employed in a
conventional panel speaker. This is different from the phenomenon in which the area of the
panel is vibrated to deform the panel. “The panel 10 is bent directly by the piezoelectric
element” means that expansion or contraction (flexure) of the piezoelectric element directly
connects the panel via the joining member or via the joining member and a reinforcing member
80 described later. It means to bend. 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
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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
[0037]
The panel 10 vibrates not only in the mounting area where the piezoelectric element 30 is
mounted, but also in the area away from the mounting area. The panel 10 has a plurality of
points vibrating in a direction intersecting the main surface of the panel 10 in the vibrating area,
and the value of the vibration amplitude changes from positive to negative with time in each of
the plurality of points. Or it changes in the opposite way. At a certain moment, the panel 10
vibrates in such a manner that the relatively large part of the vibration amplitude and the
relatively small part of the vibration seem to be randomly or periodically distributed over
substantially the entire panel 10. That is, vibration of a plurality of waves is detected over the
entire area of the panel 10. Even if the user presses the panel 10 against his / her body with a
force of, for example, 5N to 10N, the controller 50 controls the piezoelectric element 30 so that
the above-described vibration of the panel 10 does not attenuate. The applied voltage may be ±
15V. Therefore, the user can hear the sound by bringing the ear into contact with the area away
from the mounting area of the panel 10 described above.
[0038]
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
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10
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.
[0039]
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.
[0040]
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.
[0041]
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®.
[0042]
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11
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.
[0043]
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.
[0044]
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. The upper part of the panel 10 is bent directly by
the piezoelectric element 30, and the vibration is damped in the lower part relative to the upper
part. The panel 10 is bent by the piezoelectric element 30 so that the area immediately above the
piezoelectric element 30 is raised most in the long side direction of the piezoelectric element 30
as compared with its surroundings.
[0045]
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12
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
vibrating body to protrude from the outer surface of the housing 60. 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.
[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
case 60. In the second embodiment, the adjustment member 80 is disposed between the panel
10 and the piezoelectric element 30. The adjustment member 80 is an elastic member such as
rubber or silicon, for example. The adjustment member 80 may be made of, for example, a
conductive material. The adjusting member 80 may be, for example, a copper plate, an iron plate,
or a phosphor bronze plate. The adjusting member 80 may be, for example, a metal plate made
of aluminum or the like having a certain degree of elasticity. The adjusting member 80 may be,
for example, a stainless steel plate such as SUS304. The adjusting member 80 may be made of a
plurality of types of metals, for example, a metal plate in which a copper plate is plated with
silver or a plate in which a copper plate and an aluminum plate are laminated. According to the
voltage value etc. which are applied to the piezoelectric element 30, the thickness of metal plates,
such as a stainless steel board, is 0.2 mm-0.8 mm suitably, for example. The adjusting member
80 may be, for example, a resin plate. As resin which forms the board made of resin here, a
polyamide-type resin is mentioned, for example. The polyamide resin is, for example, a crystalline
thermoplastic resin obtained from metaxylylenediamine and adipic acid, and there is Reny
(registered trademark) rich in strength and elasticity. Such a polyamide resin may be a reinforced
resin reinforced with glass fiber, metal fiber, carbon fiber or the like as a base polymer itself. The
strength and elasticity are appropriately adjusted according to the amount of addition of glass
fiber, metal fiber or carbon fiber to the polyamide resin. The reinforcing resin as described above
is formed, for example, by impregnating a base material formed by knitting glass fiber, metal
11-05-2019
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fiber, carbon fiber or the like with the resin and curing it. The reinforcing resin may be formed by
mixing a finely cut fiber piece into a liquid resin and then curing it. The reinforced resin may be a
laminate of a base on which fibers are woven and a resin layer.
[0047]
That is, the electronic device 1 according to the second embodiment has a structure in which the
piezoelectric element 30 and the adjusting member 80 are bonded by the bonding member 70,
and the adjusting member 80 and the panel 10 are bonded by the bonding member 70. Further,
in the second embodiment, the display unit 20 is supported not by the panel 10 but by the
housing 60. That is, in the electronic device 1 according to the second embodiment, the display
unit 20 is separated from the panel 10, and the display unit 20 and the support unit 90 which is
a part of the housing 60 are bonded by the bonding member 70. It is a structure. In addition, the
support part 90 is not limited to the structure as a part of housing | casing 60, It is possible to
comprise as a member independent of the housing | casing 60 by metal, resin, etc. FIG.
[0048]
FIG. 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. For
this reason, in addition to the air conduction sound through air, the user can make the ear touch
an arbitrary position of the panel 10 to hear human body vibration sound.
[0049]
FIG. 7 is a view showing an example of change of the frequency characteristic by the adjusting
member 80. As shown in FIG. FIG. 7 shows the frequency characteristics when the abovementioned sheet metal such as SUS304 is used as the adjusting member 80, and the frequency
characteristics when the reinforcing resin such as the above-mentioned Reny is used as the
adjusting member 80. . The horizontal axis represents frequency, and the vertical axis represents
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sound pressure. The resonance point in the case of using a reinforced resin is about 2 kHz, and
the resonance point in the case of using a sheet metal is about 1 kHz. The dip is about 4 kHz
when the reinforced resin is used, and about 3 kHz when the sheet metal is used. That is, when
the reinforced resin is used, the resonance point of the panel 10 is located in the high frequency
region and the dip of the frequency characteristic is located in the higher frequency region as
compared with the case where the sheet metal is used. Since the frequency band used for voice
communication of the mobile phone is 300 Hz to 3.4 kHz, therefore, when a reinforced resin is
used as the adjustment member 80, the dip can be removed from the use frequency band. Even
when a sheet metal is used as the adjusting member 80, the dip can be removed from the use
frequency band of the electronic device 1 by appropriately adjusting the type or composition of
the metal constituting the sheet metal, the thickness of the sheet metal, and the like. In addition,
when comparing sheet metal and reinforced resin, the reinforced resin can reduce the influence
on the antenna performance as compared with the sheet metal. In addition, since the reinforced
resin is less likely to be plastically deformed as compared with the sheet metal, there is an
advantage that the acoustic characteristics are less likely to change. In addition, the reinforced
resin suppresses the temperature rise at the time of sound generation as compared with the
sheet metal. When the above various metal plates are used as the adjustment member 80, for
example, the adjustment member 80 is disposed in the vicinity of the contact portion between
the housing 60 and the panel 10 and electrically connected to a reference potential portion
(GND) not shown. If it is connected to, for example, static electricity that enters the inside of the
electronic device 1 from the gap between the housing 60 and the panel 10 can be introduced to
the reference potential portion. This can reduce the possibility of damage to the electronic
components inside the electronic device 1. When, for example, a stainless steel plate or a
phosphor bronze plate is used as the adjustment member 80, the stainless steel plate or the
phosphor bronze plate can be operated as an antenna element by electrically connecting the
power supply unit (not shown).
[0050]
As described above, according to the electronic device 1 according to the present embodiment,
the adjustment member 80 and the panel 10 are deformed due to the deformation of the
piezoelectric element 30 attached to the back surface of the panel 10 via the adjustment member
80, The air conduction sound and the human body vibration sound are transmitted to the object
in contact with the panel 10 to be deformed. Thus, 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, by using the adjustment member 80, it is
possible to move the resonance frequency and adjust the frequency characteristic of the sound.
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[0051]
Further, due to the adjusting member 80, dips in the frequency characteristics of the air
conduction sound and the human body vibration sound are out of the frequency band of the
sound assumed to be used for the electronic device 1. For example, the adjustment member 80
can release the position of the dip from the speech band (for example, 300 Hz to 3.4 kHz), and
can improve the frequency characteristics of the speech band.
[0052]
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.
[0053]
The adjusting member 80 is joined to the panel 10 by a joining member 70. Thus, the adjusting
member 80 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.
[0054]
Further, by arranging the adjustment 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 is
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 adjustment member
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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 adjusting member 80, a plate-like weight may be attached to the piezoelectric element 30
by the joining member 70.
[0055]
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.
[0056]
For example, as shown in FIG. 8, the panel 10 may be joined to the housing 60 by the joining
member 70. As described above, by making it difficult for the vibration from the panel 10 to be
transmitted directly to the housing 60, the risk of the user dropping the electronic device 1 can
be reduced as compared with the case where the housing itself vibrates largely. Further, the
bonding member 70 can be made of a non-heat curable adhesive. This has the advantage that
thermal stress shrinkage is less likely to occur between the housing 60 and the panel 10 during
curing. Further, the bonding member 70 can be a double-sided tape. As a result, there is an
advantage that contraction stress as in the use of an adhesive is less likely to occur between the
housing 60 and the panel 10.
[0057]
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
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plurality of piezoelectric elements 30 may be mounted.
[0058]
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.
[0059]
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.
[0060]
Reference Signs List 1 electronic device 10 panel 20 display unit 30 piezoelectric element 40
input unit 50 control unit 60 housing 70 joining member 80 adjustment member 90 support
portion
11-05-2019
18
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