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JP2014116972

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DESCRIPTION JP2014116972
Abstract: To reduce excessive deformation of a piezoelectric element. The electronic device 1
includes a panel 10, a piezoelectric element 30, a housing 60 to which the panel 10 is attached,
and an intermediate member 80 attached to the piezoelectric element 30, and the piezoelectric
element 30 is deformed. As a result, the intermediate member and the panel 10 are deformed,
and the air conduction sound and the human body vibration sound are transmitted to the object
in contact with the deformed panel 10. [Selected figure] Figure 7
Electronic device, panel unit, unit for electronic device Cross reference to related application
[0001]
The present application is described in Japanese Patent Application 2012-077674 (filed on
March 29, 2012), Japanese Patent Application 2012-076829 (filed on March 29, 2012),
Japanese patent application 2012-076965 (2012). No. 2012/116803 (filed on May 22, 2012),
the entire disclosure of which 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 measures in the case
where the deformation of the piezoelectric element of the vibrator becomes excessive.
[0007]
An object of the present invention is to provide an electronic device, a panel unit, and a unit for
an electronic device capable of reducing breakage of a piezoelectric element.
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2
[0008]
An electronic device according to the present invention comprises a panel, a piezoelectric
element, a housing to which the panel is attached, and an elastic member attached to the
piezoelectric element, the elastic member being between the panel and the piezoelectric element
And the panel is bent by the piezoelectric element so that the portion immediately above the
piezoelectric element is most raised in the long side direction of the piezoelectric element
compared with its surroundings, with respect to the object contacting the panel It transmits
human body vibration noise.
[0009]
The elastic member may be attached to the panel by a first joint member.
[0010]
The first bonding member may be a double-sided tape or a non-heat-curable adhesive.
[0011]
Further, an electronic device according to the present invention includes a panel, a piezoelectric
element, a housing to which the panel is attached, and an elastic member attached to the
piezoelectric element, the elastic member being the piezoelectric member relative to the panel An
object which is disposed outside the element, and in which the panel is bent by the piezoelectric
element so that the position immediately above the piezoelectric element is most raised in the
long side direction of the piezoelectric element compared with its surroundings. To the human
body vibration sound.
[0012]
The piezoelectric element may be attached to the panel by a second bonding member.
[0013]
The second bonding member may be a double-sided tape or a non-heat-curable adhesive.
[0014]
The elastic member may cover the side of the piezoelectric element.
[0015]
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3
The elastic member may have a plate-like portion covering the main surface of the piezoelectric
element.
[0016]
In the elastic member, an end of the elastic member may be curved toward the piezoelectric
element to cover a side portion of the piezoelectric element.
[0017]
The elastic member may cover a surface of the piezoelectric element other than the surface on
which the piezoelectric element is attached to the panel.
[0018]
The elastic member may be made of rubber or silicon.
[0019]
The human body vibration sound and the air conduction sound may be transmitted to an object
in contact with the deformed panel.
[0020]
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 It is also possible to
[0021]
The panel may constitute part or all of a display panel, an operation panel, a cover panel, and a
lid panel for making the 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 be deformed at any portion of the panel to transmit the air conduction sound and
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4
the human body vibration sound.
[0024]
The elastic member may be a member that reduces excessive deformation of the piezoelectric
element.
[0025]
The elastic member may be a member that reduces transmission of external force to the
piezoelectric element.
[0026]
The piezoelectric element may be a bimorph type or laminated type piezoelectric element.
[0027]
The elastic member may be attached to the piezoelectric element by a third bonding member.
[0028]
The third bonding member may be a double-sided tape or a non-heat-curable adhesive.
[0029]
The panel may be attached to the housing by a fourth bonding member.
[0030]
The fourth bonding member may be a double-sided tape or a non-heat-curable adhesive.
[0031]
According to the electronic device, the panel unit, and the electronic device unit according to the
present invention, breakage of the piezoelectric element can be reduced.
[0032]
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5
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.
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.
(A)-(c) is a fragmentary sectional view which shows the mounting structure of the electronic
device which concerns on 1st Embodiment, a modification, and a comparative example,
respectively.
(A)-(d) is a fragmentary sectional view which shows the mounting structure of the electronic
device which concerns on 2nd Embodiment, a modification, and a comparative example,
respectively.
It is a figure which shows the example of joining of a panel and a housing | casing.
[0033]
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6
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.
[0034]
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.
[0035]
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7
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.
[0036]
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 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
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when an electric signal (voltage) is applied.
[0037]
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.
[0038]
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.
[0039]
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
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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 an intermediate
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 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
[0040]
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
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10
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.
[0041]
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.
[0042]
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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11
[0043]
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.
[0044]
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®.
[0045]
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.
[0046]
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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.
[0047]
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.
[0048]
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.
[0049]
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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, an intermediate member 80 is disposed between the panel
10 and the piezoelectric element 30. For example, the intermediate member 80 may function as
a member that reduces the transmission of the external force to the piezoelectric element 30 in
order to reduce the breakage of the piezoelectric element due to the external force. The
intermediate member 80 may also function as a member that reduces excessive deformation of
the piezoelectric element. The intermediate member 80 is an elastic member such as rubber or
silicon, for example. The intermediate member 80 may be made of, for example, a conductive
material. The intermediate member 80 may be, for example, a copper plate, an iron plate, or a
phosphor bronze plate. The intermediate member 80 may be, for example, a metal plate made of
aluminum or the like having a certain degree of elasticity. The intermediate member 80 may be,
for example, a stainless steel plate such as SUS304. The intermediate 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 intermediate
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 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.
[0050]
That is, the electronic device 1 according to the second embodiment has a structure in which the
piezoelectric element 30 and the intermediate member 80 are bonded by the bonding member
70, and the intermediate member 80 and the panel 10 are bonded by the bonding member 70.
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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.
[0051]
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.
[0052]
As described above, according to the electronic device 1 according to the present embodiment,
the intermediate 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 intermediate
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, vibration due to expansion and
contraction or bending of the piezoelectric element 30 is first transmitted to the intermediate
member 80 and further transmitted to the panel 10. That is, the piezoelectric element 30 first
vibrates the intermediate member 80 having a larger elastic coefficient than the piezoelectric
element 30, and further vibrates the panel 10. Therefore, as compared with a structure in which
the piezoelectric element 30 is joined to the panel 10 by the joining member 70 without the
intermediate member 80, the deformation of the piezoelectric element 30 can be less likely to be
excessive. Thereby, the amount of deformation (degree of deformation) of the panel 10 can be
adjusted. This structure is effective particularly in the case of the panel 10 in which the
11-05-2019
15
deformation of the piezoelectric element 30 is not easily inhibited.
[0053]
In addition, the intermediate member 80 functions as a member that reduces the transmission of
the external force to the piezoelectric element 30. For this reason, it is possible to reduce the
breakage of the piezoelectric element due to the external force. For example, when an external
force is applied to the panel 10 by the electronic device 1 falling to the ground, the external force
is first transmitted to the intermediate member 80. The intermediate member 80 has a
predetermined elasticity, and is elastically deformed by an external force transmitted from the
panel 10. Thereby, at least a part of the external force applied to the panel 10 is absorbed by the
intermediate member 80, and the external force transmitted to the piezoelectric element 30 is
reduced. As a result, breakage of the piezoelectric element 30 can be reduced. In addition, when
the intermediate member 80 is disposed between the piezoelectric element 30 and the housing
60, the housing 60 is deformed by, for example, the electronic device 1 falling to the ground, and
the deformed housing 60 becomes the piezoelectric element 30. It is possible to reduce the
possibility that the piezoelectric element 30 is broken due to the collision.
[0054]
The intermediate member 80 also functions as a member that reduces excessive deformation of
the piezoelectric element. For this reason, it is possible to reduce excessive deformation of the
piezoelectric element. For example, vibration due to expansion or contraction or bending of the
piezoelectric element 30 is first transmitted to the intermediate member 80 and further
transmitted to the panel 10. That is, the piezoelectric element 30 first vibrates the intermediate
member 80 having a larger elastic coefficient than the piezoelectric element 30, and further
vibrates the panel 10. Therefore, as compared with a structure in which the piezoelectric element
30 is joined to the panel 10 by the joining member 70 without the intermediate member 80, the
deformation of the piezoelectric element 30 can be less likely to be excessive. Thereby, the
amount of deformation (degree of deformation) of the panel 10 can be adjusted. This structure is
effective particularly in the case of the panel 10 in which the deformation of the piezoelectric
element 30 is not easily inhibited.
[0055]
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16
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.
[0056]
The intermediate member 80 is disposed between the panel 10 and the piezoelectric element 30,
and the piezoelectric element 30 and the intermediate member 80 are joined by the joining
member 70. When the intermediate member 80 is disposed outside the piezoelectric element 30
with respect to the panel 10, deformation of the piezoelectric element 30 is transmitted through
the bonding member 70. On the other hand, when the intermediate member 80 is disposed
between the panel 10 and the piezoelectric element 30, the deformation of the piezoelectric
element 30 is directly transmitted to the intermediate member 80. Therefore, the joint member
between the piezoelectric element 30 and the intermediate member 80 There is an advantage
that 70 interfacial peeling hardly occurs.
[0057]
In addition, when the intermediate member 80 is a resin plate described above, plastic
deformation is less likely to occur as compared with the case where a metal plate is used, so that
there is an advantage that acoustic characteristics are unlikely to change. Moreover, compared
with the case where the intermediate member 80 made of sheet metal is used, the characteristics
of the antenna (not shown) disposed in the electronic device 1 are less likely to be affected.
[0058]
When the various metal plates described above are used as the intermediate member 80, for
example, the intermediate 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
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17
phosphor bronze plate is used as the intermediate 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).
[0059]
The intermediate member 80 is joined to the panel 10 by a joining member 70. Thus, the
intermediate 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.
[0060]
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.
[0061]
For example, in the first and second embodiments described above, the intermediate member 80
is a plate-like member, but the shape of the intermediate member 80 is not limited thereto. For
example, the intermediate member may be larger than the piezoelectric element 30, and may
have a shape in which an end thereof is curved toward the piezoelectric element 30 and covers
the side of the piezoelectric element 30. Further, the intermediate member may have a shape
including, for example, a plate-like portion and an extension portion which is extended from the
plate-like portion and covers the side portion of the piezoelectric element 30. In this case, the
extension portion and the side portion of the piezoelectric element may be separated by a
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predetermined distance. This makes it difficult for the extension portion to inhibit the
deformation of the piezoelectric element.
[0062]
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 60 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.
[0063]
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.
[0064]
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.
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[0065]
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.
[0066]
DESCRIPTION OF SYMBOLS 1 electronic device 10 panel 20 display part 30 piezoelectric
element 40 input part 50 control part 60 housing 70 joining member 80 intermediate member
90 support part [problem to be solved by the invention]
[0067]
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 in the electronic device that vibrates
the panel attached to the housing.
[0068]
An object of the present invention is to provide an electronic device of a type that vibrates a
panel attached to a housing that can be used well. [Means for Solving the Problems]
[0069]
The present invention comprises a piezoelectric element, a panel that generates air-conducted
sound and an oscillating sound transmitted by vibrating a part of a human body by vibrating with
the piezoelectric element, and a housing to which the panel is attached. The piezoelectric element
and the panel are electronic devices joined at both ends in the longitudinal direction of the
11-05-2019
20
piezoelectric element. [Effect of the invention]
[0070]
According to the present invention, it is possible to provide an electronic device of a type that
vibrates a panel attached to a housing that can be favorably used and a unit for an electronic
device used for the electronic device. Brief Description of the Drawing
[0071]
FIG. 1 is a diagram showing functional blocks of an electronic device according to an
embodiment of the present invention. FIG. 2 shows a preferred shape of the panel. FIG. 3 is a
view showing a mounting structure of the electronic device according to the first embodiment.
FIG. 4 is a view showing an example of the vibration of the panel of the electronic device
according to the first embodiment. FIG. 5 is a view showing a mounting structure of an electronic
device according to a second embodiment. FIG. 6 is a view showing an example of the vibration
of the panel of the electronic device according to the second embodiment. FIG. 7 is a view
showing an example of bonding of a panel and a housing. [FIG. 8] (a) to (c) are partial sectional
views showing the mounting structure, the modified example, and the comparative example of
the electronic device according to the first embodiment, respectively. [FIG. 9] (a) to (d) are partial
sectional views showing the mounting structure, the modified example, and the comparative
example of the electronic device according to the second embodiment, respectively. FIG. 10 is a
view showing an example of bonding of a panel and a housing. [Form for carrying out the
invention]
[0072]
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.
[0073]
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21
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.
[0074]
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.
[0075]
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.
[0076]
The piezoelectric element 30 is disposed on the back surface of the panel 10 (the surface on the
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22
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.
[0077]
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.
[0078]
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 which is an applied voltage of a so-called
panel speaker for the purpose of sound conduction by air conduction sound instead of vibration
sound. You may 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 Vibration noise can be generated through the unit.
[0079]
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
11-05-2019
23
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 an oscillating 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 air
conduction sound and vibration sound 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
[0080]
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.
[0081]
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
11-05-2019
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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 Research
Institute (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.
[0082]
The electronic device 1 described above can transmit the air conduction sound and the vibration
sound through a part of the user's body (for example, the cartilage of the outer ear) to the user
by the vibration of the panel 10. Therefore, when outputting a sound having a volume equivalent
to that of a conventional dynamic receiver, the sound transmitted to the surroundings of the
electronic device 1 due to the vibration of air due to the vibration of the panel 10 is smaller than
that of the dynamic receiver. Therefore, it is suitable, for example, when listening to a recorded
message on a train or the like.
[0083]
In addition, since the electronic device 1 described above transmits the vibration sound by the
vibration of the panel 10, for example, even if the user wears earphones or headphones, the user
can contact the electronic device 1 by contacting them. You can hear the sound through
headphones and body parts.
[0084]
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®.
11-05-2019
25
[0085]
First Embodiment FIG. 3 is a view showing a mounting structure of an electronic device 1
according to a first embodiment. FIG. 3A is a front view. FIG.3 (b) is sectional drawing along the
bb line in FIG. 3 (a). FIG. 8A is a partial cross-sectional view taken along the line c-c in FIG. FIG. 8
(b) is a partial cross-sectional view according to a modification of FIG. 8 (a). FIG.8 (c) is a
fragmentary sectional view which shows the structure of a comparative example with the
structure of Fig.8 (a). The electronic device 1 shown in FIGS. 3 and 8 is a smartphone in which a
touch panel which is a glass plate as the panel 10 is disposed on the front surface of a housing
60 (for example, a case of metal or resin). 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 unit 70, respectively. The bonding portion 70 is an adhesive having a
thermosetting property, an ultraviolet ray curing property, or the like, a double-sided 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.
[0086]
As shown to Fig.8 (a), the junction part 70 consists of a pair of joining member 70a, 70b. The
pair of bonding members 70 a and 70 b respectively support both end portions in the
longitudinal direction of the piezoelectric element 30. Thereby, as shown in FIG. 8C, the degree of
freedom of expansion and contraction in the longitudinal direction of the piezoelectric element
30 is unlikely to be inhibited, as compared with the case where the joint portion 70 is joined to
the entire surface of the piezoelectric element 30. Therefore, the amplitude of the panel can be
increased as compared to the case where the entire surface of the piezoelectric element 30 is
joined.
[0087]
For example, an air layer may be interposed between the pair of bonding members 70a and 70b,
and a sponge, an electronic component, etc., which are bonded to only one of the piezoelectric
element 30 and the panel are not disposed. It may be
[0088]
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26
In FIG. 8 (b), the joint 70 comprises three joint members 70a, 70b and 70c.
In addition to the pair of joining members 70a and 70b, the joining member 70c is added
between them. The bonding members 70a, 70b, 70c support the piezoelectric element 30 at
respective bonding regions in the longitudinal direction. As a result, as shown in FIG. 8C, the
degree of freedom of expansion and contraction in the longitudinal direction of the piezoelectric
element is less likely to be inhibited compared to the case where the joint 70 is joined to the
entire surface of the piezoelectric element. Therefore, the amplitude of the panel can be
increased as compared to the case where the entire surface of the piezoelectric element 30 is
joined.
[0089]
In addition, although the structure shown to Fig.8 (a) is the hardest to inhibit expansioncontraction, conversely, bonding strength becomes weak. Therefore, depending on how much
each of the flexibility and the bonding strength is designed, the number of the bonding members,
the length of each bonding member, the length in the longitudinal direction of the air layer
without the bonding members, bonding The adhesion of the member may be determined
appropriately.
[0090]
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.
[0091]
FIG. 4 is a view showing an example of the vibration of the panel 10 of the electronic device 1
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27
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.
[0092]
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 addition, air
conduction sound and vibration sound are transmitted. Thus, the air conduction noise and the
vibration noise can be transmitted to the user without causing the vibrating body to protrude
from the outer surface of the housing 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.
[0093]
Second Embodiment FIG. 5 is a view showing a mounting structure of an electronic device 1
according to a second embodiment. FIG. 5A is a front view. FIG. 5 (b) is a cross-sectional view
taken along the line bb in FIG. 5 (a). Fig.9 (a) is a fragmentary sectional view in alignment with
the cc line in FIG. 5 (a). FIG.9 (b) and FIG.9 (c) are fragmentary sectional views which show the
modification of FIG. 9 (a). FIG.9 (d) is a fragmentary sectional view which shows the structure of a
comparative example with the structure of Fig.9 (a). The electronic device 1 shown in FIGS. 5 and
9 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 surface of the upper case 60. In the second
embodiment, an intermediate member 80 is disposed between the panel 10 and the piezoelectric
element 30 to reduce the transmission of external force to the piezoelectric element 30.
[0094]
The intermediate member 80 is an elastic member such as rubber or silicon, for example. The
11-05-2019
28
intermediate member 80 may be, for example, a metal plate made of aluminum or the like having
a certain degree of elasticity. The intermediate 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 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.
[0095]
The electronic device 1 according to the second embodiment has a structure in which the
piezoelectric element 30 and the intermediate member 80 are bonded by the first bonding
portion 71, and further, the intermediate member 80 and the panel 10 are bonded by the second
bonding portion 72. is there. 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 unit 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.
[0096]
Here, as shown to Fig.9 (a), the 1st joined part 71 which joins piezoelectric element 30 and
middle member 80 may consist of a pair of joined members 71a and 71b. The pair of bonding
members 71 a and 71 b respectively support both ends of the piezoelectric element 30 in the
longitudinal direction. For example, an air layer may be interposed between the pair of bonding
members 71a and 71b, and a sponge, an electronic component, or the like which is bonded only
to one of the piezoelectric element 30 and the intermediate member 80 without bonding them. It
may be arranged. The second joining member 72 joining the intermediate member 80 and the
panel 10 joins almost the entire surface of the intermediate member 80 to the panel 10. In this
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29
structure, as shown in FIG. 9D, the degree of freedom in expansion and contraction in the
longitudinal direction of the piezoelectric element is unlikely to be inhibited, as compared with
the case where the bonding portion 71 is bonded to the entire surface of the piezoelectric
element. Therefore, the amplitude of the panel can be increased as compared to the case where
the entire surface of the piezoelectric element 30 is joined. As compared with the structure of
FIG. 9D, in the structure of FIG. 9A, the amplitude of the panel is increased by 22% at the
maximum.
[0097]
Moreover, as shown in FIG.9 (b), the 2nd joined part 72 which joins panel 10 and intermediate
member 80 consists of a pair of joined members 72a and 72b. The pair of joining members 72 a
and 72 b respectively support the longitudinal opposite end portions of the intermediate member
80. For example, an air layer may be interposed between the pair of bonding members 72a and
72b, and a sponge, an electronic component or the like may be disposed without bonding the
panel 10 and the intermediate member 80 and bonding only one of them. It may be done. The
first bonding member 71 for bonding the intermediate member 80 and the piezoelectric element
30 is bonded to the piezoelectric element 30 almost all over the intermediate member 80. In this
structure, as shown in FIG. 9D, the degree of freedom in expansion and contraction in the
longitudinal direction of the intermediate member 80 is less likely to be inhibited compared to
the case where the joint portion 72 is joined to the entire surface of the intermediate member 80.
Therefore, the degree of freedom in the longitudinal direction of the piezoelectric element 30 is
unlikely to be hindered. Therefore, as compared with the case where the entire surface of the
intermediate member 80 is joined, the amplitude of the panel can be increased. As compared
with the structure of FIG. 9 (d), in the structure of FIG. 9 (b), the amplitude of the panel is at most
24% larger.
[0098]
Further, as shown in FIG. 9C, the first bonding portion 71 for bonding the piezoelectric element
30 and the intermediate member 80 may be a pair of bonding members 71a and 71b. The pair of
bonding members 71 a and 71 b respectively support both ends of the piezoelectric element 30
in the longitudinal direction. In addition, the second bonding portion 72 for bonding the panel 10
and the intermediate member 80 may be formed of a pair of bonding members 72a and 72b. The
pair of joining members 72 a and 72 b respectively support the longitudinal opposite end
portions of the intermediate member 80. In this structure, as compared with the case where the
bonding portion 72 is bonded to the entire surface of the piezoelectric element 30 and the entire
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30
surface of the intermediate member 80 as shown in FIG. 9D, the piezoelectric element 30 and the
intermediate member 80 in the longitudinal direction The degree of freedom in stretching is
unlikely to be impeded. Therefore, the amplitude of the panel can be increased as compared to
the case where the entire surfaces of the piezoelectric element 30 and the intermediate member
80 are joined. Compared with the structure of FIG. 9D, in the structure of FIG. 9C, the amplitude
of the panel is 14% larger at the maximum.
[0099]
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 the air conduction sound through the air, the user can make the ear
touch an arbitrary position of the panel 10 to hear the vibration sound.
[0100]
As described above, according to the electronic device 1 according to the present embodiment,
the intermediate 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 intermediate
member 80, The air conduction noise and the vibration noise are transmitted to the object in
contact with the panel 10 to be deformed. Thus, the air conduction noise and the vibration noise
can be transmitted to the user without causing the vibrating body to protrude from the outer
surface of the housing 60. Also, for example, when an external force is applied to the panel 10 by
the electronic device 1 falling to the ground, the external force is first transmitted to the
intermediate member 80. The intermediate member 80 has a predetermined elasticity, and is
elastically deformed by an external force transmitted from the panel 10. Thereby, at least a part
of the external force applied to the panel 10 is absorbed by the intermediate member 80, and the
external force transmitted to the piezoelectric element 30 is reduced. As a result, breakage of the
piezoelectric element 30 can be reduced. In addition, when the intermediate member 80 is
disposed between the piezoelectric element 30 and the housing 60, the housing 60 is deformed
by, for example, the electronic device 1 falling to the ground, and the deformed housing 60
becomes the piezoelectric element 30. It is possible to reduce the possibility that the piezoelectric
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31
element 30 is broken due to the collision.
[0101]
Alternatively, the intermediate member 80 is a member that reduces damage to the piezoelectric
element 30 due to the curvature of the piezoelectric element itself. The intermediate member 80
makes it difficult for the piezoelectric element to bend, and the piezoelectric element itself is not
curved too much, so that the piezoelectric element itself is unlikely to be broken or cracked.
[0102]
Alternatively, the intermediate member 80 is a member that makes the total weight of the
piezoelectric element 30 and the intermediate member 80 heavier than the weight of the
piezoelectric element 30 alone. This makes it possible to adjust the frequency at which the
amplitude dip that occurs at a particular frequency occurs.
[0103]
In addition, deformation occurs in the panel 10 not only in the mounting area where the
piezoelectric element 30 is attached, but also in any portion of the panel 10 for transmitting the
air conduction sound and the vibration sound. Therefore, in addition to airborne sound through
the air, the user can touch the ear to an arbitrary position of the panel 10 to hear vibration
sound.
[0104]
In addition, the intermediate member 80 is disposed between the panel 10 and the piezoelectric
element 30, and the piezoelectric element 30 and the intermediate member 80 are joined by the
joining portion 70. When the intermediate member 80 is disposed on the side opposite to the
panel 10 of the piezoelectric element 30, the deformation of the piezoelectric element 30 is
transmitted through the joint 70. On the other hand, when the intermediate member 80 is
disposed between the panel 10 and the piezoelectric element 30, the deformation between the
piezoelectric element 30 is directly transmitted to the intermediate member 80. There is an
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advantage that 70 interfacial peeling hardly occurs.
[0105]
In addition, the intermediate member 80 is joined to the panel 10 by a joining unit 70. Thus, the
intermediate 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. The joint 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. The joint 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.
[0106]
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.
[0107]
For example, as shown in FIG. 10, the panel 10 may be joined to the housing 60 by the joint part
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 60 itself vibrates largely. The joint 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. The
joint 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. Further,
in FIG. 10, the piezoelectric element 30 is supported by the pair of bonding members 71 a and
71 b at both ends of the piezoelectric element 30 on the display panel which is the intermediate
member 80. For example, an air layer may be interposed between the pair of bonding members
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71a and 71b, and a sponge, an electronic component or the like may be disposed without
bonding the piezoelectric element 30 and the display panel. It may be done. In this case, the
panel 10 is not a display panel but a protective panel or a touch panel for protecting the display
panel.
[0108]
Further, the display panel which is the intermediate member 80 is supported by the panel 10 by
the pair of joining members 72 a and 72 b. For example, an air layer may be interposed between
the pair of bonding members 72a and 72b, and a sponge or an electronic component or the like
may be disposed without bonding the piezoelectric element 30 and the display panel. It may be
done. Also in such a structure, the degree of freedom in expansion and contraction in the
longitudinal direction of the piezoelectric element is less likely to be inhibited, as compared with
the case where the bonding portion is bonded to the entire surface of the piezoelectric element
or the entire surface of the display panel as an intermediate member. Therefore, the amplitude of
the panel can be increased.
[0109]
For example, in the first and second embodiments described above, the intermediate member 80
is a plate-like member, but the shape of the intermediate member 80 is not limited thereto. For
example, the intermediate member may be larger than the piezoelectric element 30, and may
have a shape in which an end thereof is curved toward the piezoelectric element 30 and covers
the side of the piezoelectric element 30. Further, the intermediate member may have a shape
including, for example, a plate-like portion and an extension portion which is extended from the
plate-like portion and covers the side portion of the piezoelectric element 30. In this case, the
extension portion and the side portion of the piezoelectric element may be separated by a
predetermined distance. This makes it difficult for the extension portion to inhibit the
deformation of the piezoelectric element.
[0110]
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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34
transmitted to the entire panel 10 to improve the quality of the air conduction sound, or the user
can listen to various positions of the panel 10 The vibration noise can be recognized even by
touching it. As in the above-described embodiment, a plurality of piezoelectric elements 30 may
be stacked in the thickness direction and mounted.
[0111]
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.
[0112]
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.
[Explanation of the code]
[0113]
DESCRIPTION OF SYMBOLS 1 electronic device 10 panel 20 display part 30 piezoelectric
element 40 input part 50 control part 60 housing | casing 70 junction part 71, 72 joining
member 80 intermediate member 90 support part
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