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JP2015126409

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DESCRIPTION JP2015126409
The present invention provides an electronic device in which a piezoelectric element is attached
to a panel, which can further improve the sound pressure characteristic. An electronic device 1
according to the present invention includes a case, a panel held by the case, and a piezoelectric
element attached to the panel, the electronic device 1 being caused by deformation of the
piezoelectric element. The electronic device transmits a human body vibration sound to an object
which is deformed by a panel and contacts the panel, and the sheet member is provided between
the housing and the panel, and the sheet member is a part of the sheet member. Is joined to the
panel, and another part different from the part is joined to the housing, and in the sheet member,
between the part and the other part, both the panel and the housing are Has an unmounted area.
[Selected figure] Figure 1
Electronics
[0001]
The present invention relates to an electronic device that vibrates a panel by applying a
predetermined electrical signal to a piezoelectric element and transmits sound to a user by
transmitting vibration of the panel to a human body.
[0002]
Patent Document 1 discloses that in an electronic device such as a mobile phone terminal, a
human body vibration sound is transmitted to an object in contact with the panel by vibrating the
panel due to a deformation of a piezoelectric element attached to the panel. Have been described.
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1
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) in contact with the vibrating object. ing.
[0003]
Patent No. 5255142
[0004]
In the electronic device described in Patent Document 1, further improvement in sound pressure
characteristics is desired for various applications.
[0005]
An object of the present invention is to provide an electronic device in which a piezoelectric
element is attached to a panel, which can further improve the sound pressure characteristic.
[0006]
An electronic device according to the present invention includes a housing, a panel held by the
housing, and a piezoelectric element attached to the panel, and the panel is deformed due to the
deformation of the piezoelectric element. An electronic device for transmitting human body
vibration sound to an object in contact with the panel, wherein the sheet member is provided
between the housing and the panel, and the sheet member is a part of the sheet member in the
panel The other part different from the part is joined to the case, and both the panel and the case
are attached between the part and the other part of the sheet member. With no area.
[0007]
Further, the area of the sheet member may be deformed following the deformation of the panel.
[0008]
Further, the area of the sheet member may be deformed in a direction parallel to the vibration
direction of the panel.
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2
[0009]
Further, the area of the sheet member may be deformed in a direction perpendicular to the
vibration direction of the panel.
[0010]
The piezoelectric element is attached to the surface of the sheet member opposite to the surface
attached to the panel, and the area of the sheet member to which the panel is attached when the
panel is viewed in plan view. The sheet member may have a region at least overlapping the
region where the piezoelectric element is attached.
[0011]
Further, an area where neither the housing nor the panel in the sheet member is attached is
adjacent to the area in the sheet member to which the panel is attached or the area in the sheet
member to which the piezoelectric element is attached. May be formed.
[0012]
In addition, the width of the area in the sheet member may be changeable in the direction of the
short side of the panel.
[0013]
The sheet member may be made of a PET film, an acrylic film, or a polyamide resin film.
[0014]
The sheet member may be a touch panel.
[0015]
Further, the sheet member may be a shatterproof sheet for preventing shattering of glass
constituting the panel.
[0016]
The sheet member may be a double-sided tape.
[0017]
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3
In the double-sided adhesive tape, the adhesive layer may not be disposed in the area where the
panel and the housing are not attached. Further, the electronic device according to the present
invention may be held by the housing and the housing An electronic apparatus comprising: a
panel having the above structure, and a piezoelectric element attached to the panel, wherein the
panel deforms due to the deformation of the piezoelectric element and transmits a human body
vibration sound to an object in contact with the panel And a sheet member is provided between
the housing and the panel, and a part of the sheet member is joined to the panel, and another
part different from the part is joined to the housing. It has a deformation area between the part
and the other part of the sheet member.
[0018]
Further, an electronic device according to the present invention includes a housing, the panel
held in the housing, and a piezoelectric element attached to the panel, the panel being caused by
deformation of the piezoelectric element. An electronic device that vibrates and transmits a
human body vibration sound to an object in contact with the panel, wherein the panel is attached
to the housing at one end of the panel by a joining member, and opposite to the one end of the
panel The other end is attached to the casing via a sheet member, and a part of the sheet
member is joined to the panel, and another portion different from the part is joined to the casing.
The fixing strength between the other end of the panel and the housing is lower than the fixing
strength between the one end of the panel and the housing.
[0019]
According to the electronic device of the present invention, it is possible to provide the electronic
device in which the sound pressure characteristic can be further improved in the electronic
device in which the piezoelectric element is attached to the panel.
[0020]
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 basic structure of the electronic device which concerns on
embodiment of this invention.
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It is a figure which shows an example of a vibration of the panel of the electronic device which
concerns on embodiment of this invention.
It is sectional drawing which shows the detailed structure of the electronic device which
concerns on embodiment of this invention.
It is a figure which shows the conventional structure in the electronic device in which the
piezoelectric element was attached to the panel.
It is sectional drawing which shows the structure of this invention at the time of using a doublesided tape as a sheet member.
It is a figure which shows the frequency characteristic of the electronic device in embodiment of
this invention.
(A), (b) and (c) are cross-sectional views showing a plurality of modified examples of the
configuration of the present invention.
(A), (b) is a cross-sectional view showing a plurality of further modifications of the configuration
of the present invention.
It is a figure for demonstrating the cross-section in a different position in the short side direction
of the main surface of an electronic device.
It is sectional drawing which shows the structure of this invention at the time of using a
scattering prevention sheet as a sheet member.
FIG. 7 is a cross-sectional view showing a configuration in which a piezoelectric element is
attached to a housing in the embodiment of the present invention.
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[0021]
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.
[0022]
The panel 10 is a touch panel that detects a touch, a cover panel that protects the display unit
20, or the like.
For example, it is formed of glass, a synthetic resin such as acrylic, sapphire or the like.
Here, sapphire is made of a crystal of aluminum oxide (AlO 3) and means industrially
manufactured.
The shape of the panel 10 may be plate-like. The panel 10 may be a flat plate or a curved panel
having a curved surface shape in part. When the panel 10 is a touch panel, it 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 resistive film method, a surface acoustic wave method
(or ultrasonic method), an infrared method, an electromagnetic induction method, and a load
detection method can be used.
[0023]
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The display unit 20 is a display device such as a liquid crystal display, an organic EL display, or
an inorganic EL display. Furthermore, it may be a flexible display having flexibility. The
characteristics of a suitable flexible display are, for example, about 0.1 mm in thickness and
about 4 mm in radius of curvature, and an organic EL display is most suitable for this. 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. Alternatively, in a preferred embodiment, the display unit 20 may be bonded to the
back of the panel 10 by a bonding member (for example, an adhesive). The bonding member is,
for example, an elastic resin such as photoelastic resin in which the refractive index of light to be
transmitted is controlled. The display unit 20 transmits various types of information through the
bonding member and the panel 10.
[0024]
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. When an electric signal (voltage) is applied to the laminated piezoelectric element, a
displacement of deflection occurs in the laminating direction of each layer, that is, the thickness
direction.
[0025]
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.
[0026]
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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. When the control unit 50 applies an electrical signal to the
piezoelectric element 30, the piezoelectric element 30 causes bending displacement in the
thickness direction. At this time, the panel 10 to which the piezoelectric element 30 is attached is
deformed according to the displacement of the piezoelectric element 30, and the panel 10
vibrates. For this reason, the panel 10 generates an air conduction sound. In addition, the panel
10 transmits human body vibration sound to an object in contact with the panel 10. As an object,
for example, there is a part of the user's body (such as cartilage of the outer ear). For example,
the control unit 50 can cause the piezoelectric element 30 to apply an electrical signal
corresponding to the voice signal related to the voice of the other party to generate air
conduction sound and human body vibration noise corresponding to the voice 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 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. Thus, even when the user presses the panel 10 against his / her body with
a force of, for example, 3 N or more (5 N to 10 N), the panel 10 generates sufficient vibration to
cause one of the user's body Human body vibration noise can be generated through the unit. The
level of applied voltage can be appropriately adjusted according to the fixed strength of the panel
10 to the housing or the support member or the performance of the piezoelectric element 30.
[0027]
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 with the main surface of the panel 10 in the vibrating
area, and in each of the plurality of points, the value of the vibration amplitude changes from
plus to minus with time. 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.
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[0028]
Here, the panel 10 may be approximately the same size as the user's ear. Also, the panel 10 may
be larger than the user's ear, as shown in FIG. In this case, when the user listens to the sound, the
entire ear is easily covered by the panel 10 of the electronic device 1, so ambient noise (noise)
can be made less likely to enter the ear canal. The panel 10 is wider than a region having a
length corresponding to the distance from the lower ear ring (lower leg) to the anti tragus and a
width corresponding to the distance from the tragus to the anti-ear wheel Should vibrate. The
panel 10 preferably has a length corresponding to the distance from the portion near the upper
ear ring leg (upper upper wheel leg) to the ear lobe in the ear ring, and the distance between the
portion from the tragus to the portion near the anti ear ring in the ear ring A region having a
width corresponding to H may vibrate. The longitudinal direction is the longitudinal direction 2a
in which the panel 10 extends in this example, and the piezoelectric element 30 is disposed
closer to one end from the center thereof. Moreover, the width direction is a direction 2b
orthogonal to the longitudinal direction. The region having such length and width may be a
rectangular region, or may be an elliptical shape having the above length as the major axis and
the above width as the minor axis. The average size of Japanese ears can be known by referring
to the Japanese Human Body Size Database (1992-1994) prepared by the Human Life
Engineering Research Center (HQL). If the size of the panel 10 is larger than the average size of
Japanese ears, the panel 10 is considered to be a size that can cover almost the entire foreign
ears.
[0029]
By having the size and shape as described above, the panel 10 can cover the user's ear and is
tolerant of displacement when placed on the ear.
[0030]
The electronic device 1 described above can transmit the air conduction sound and the vibration
sound via 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
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9
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.
[0031]
In addition, since the electronic device 1 described above transmits vibration sound by the
vibration of the panel 10, for example, even if the user wears earphones or headphones, the user
contacts the electronic device 1 with them so that the user can You can hear the sound through
headphones and body parts.
[0032]
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®.
[0033]
FIG. 3 is a view showing a basic structure of the electronic device 1 according to the embodiment
of the present invention. 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 is bonded to the housing 60 by the bonding member
70 and held by the housing 60. The panel 10 is attached to the housing 60 on the upper side of
the electronic device 1 partially via a sheet member described later. Here, the bonding member
70 is, for example, an adhesive or a double-sided tape. The input unit 40 is also supported by the
housing 60. The display unit 20 and the piezoelectric element 30 are attached to the panel 10 by
a bonding member 70. As a bonding member 70 suitable for attaching the piezoelectric element
30 to the panel 10, an adhesive having thermosetting or ultraviolet curing property, a doublesided tape, etc. may be mentioned. For example, a colorless transparent acrylic ultraviolet curing
11-05-2019
10
adhesive It may be an optical elastic resin. The panel 10, the display unit 20, and the
piezoelectric element 30 each have a substantially rectangular shape.
[0034]
The display unit 20 is disposed substantially at the center of the panel 10 in the lateral direction.
The piezoelectric element 30 is provided 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 provided side by side in a direction parallel to the
surface on the inner side of the panel 10.
[0035]
The electronic device 1 according to the present embodiment has the above-described
configuration, so that 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 to be in contact with the
deformed panel 10 The air conduction sound and the vibration sound can be transmitted to the
object.
[0036]
FIG. 4 is a view showing an example of the vibration of the panel 10 of the electronic device 1
according to the embodiment of the present invention.
In the electronic device 1 according to the present 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. That is, the upper part
of the panel 10 is bent directly by the piezoelectric element 30, and the vibration is attenuated in
the lower part compared to the upper part. The panel 10 is bent by the piezoelectric element 30
so that the position immediately above the piezoelectric element 30 in the long side direction 2a
of the piezoelectric element 30 is raised most as compared with its periphery. Therefore, the
vibration generated by the piezoelectric element 30 can be attenuated in the longitudinal
direction 2 a of the panel 10. 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.
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[0037]
Further, the electronic device 1 transmits a sound to the object by the vibration of the panel 10.
Here, assuming that the piezoelectric element 30 is attached to the case 60 and vibrates the case
60, when the user picks up the electronic device and talks, the electronic device is vibrated by
the vibration of the case 60. (Usually, the user holds a case of the electronic device and makes a
call). On the other hand, in the electronic device 1 in which the panel 10 is vibrated, such a
problem hardly occurs.
[0038]
By the way, as for the electronic device 1 which concerns on this embodiment, the improvement
of the further sound pressure characteristic is desired. Then, the applicant examined the
structure of the electronic device 1 that enables the sound pressure characteristics to be further
improved. Hereinafter, the structure of the electronic device 1 studied will be described in detail.
[0039]
FIG. 5 is a cross-sectional view showing the detailed configuration of the electronic device 1
according to the embodiment of the present invention. In the electronic device 1, a sheet member
80 is provided between the housing 60 and the panel 10. In the sheet member 80, a part of the
sheet member 80 is joined to the panel 10, and the other part different from the part is joined to
the housing 60. Specifically, one end of the sheet member 80 is attached to the panel 10 via the
joining member 70, and the other end opposite to the end in the extension direction of the sheet
member 80 is the housing 60 via the joining member 70. Attached to Further, the piezoelectric
element 30 is attached to the surface of the sheet member 80 opposite to the surface to be
joined to the panel 10 via the joining member 70. In the present configuration, both ends of the
sheet member 80 are attached to the panel 10 or the housing 60. However, the attached area
does not have to be an end, and a predetermined distance from the end is required. The present
invention can be practiced even if a predetermined area separated by only a predetermined
distance is attached to the panel 10 or the housing 60. The same applies to the modifications
described later.
[0040]
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12
Here, the sheet member 80 is made of, for example, a PET (polyethylene terephthalate) film, an
acrylic film, or the like, and has a thickness of about 0.05 mm. Such a sheet member 80 is easily
deformed by an external force. For example, when an external force is applied in the thickness
direction of the sheet member 80, bending deformation occurs in the direction of the external
force.
[0041]
The sheet member 80 may be, for example, an elastic material such as rubber or silicone, a
polyamide resin, or a film made of Gore-Tex (registered trademark) described above, in addition
to the PET film and the acrylic film. 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 the mixture. The reinforced
resin may be a laminate of a base on which fibers are woven and a resin layer. Further, the sheet
member 80 may be a metal plate widely used as a component of a precision device, such as iron,
stainless steel (alloy of iron and chromium), aluminum or the like.
[0042]
The sheet member 80 is a region A in which neither the panel 10 nor the housing 60 is attached
between the region of the sheet member 80 joined with the panel 10 and the region joined with
the housing 60. Have. Region A corresponds to the width indicated by the double arrow in FIG.
An area A in the sheet member 80 is an area in which the sheet member 80 can be deformed
(e.g., bending deformation). Therefore, the area A in the sheet member 80 can be deformed
following the deformation of the panel 10. Hereinafter, the area A is referred to as a deformation
area A.
[0043]
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13
The sheet member 80 is disposed such that the deformation area A of the sheet member 80 is
substantially parallel to the panel 10. Therefore, the deformation area A is bent and deformed in
a direction substantially parallel to the vibration (deformation) direction of the panel 10 (the
panel 10 is deformed in the direction perpendicular to the main surface of the panel 10). Here,
FIG. 6 shows a conventional structure of an electronic device in which a piezoelectric element is
attached to a panel. In the conventional structure, no sheet member is provided between the
housing 60 and the panel 10, and the housing 60 and the panel 10 are joined by the joining
member 70 in their stacking direction. The stacking direction of the housing 60 and the panel 10
is substantially the same as the vibration (deformation) direction of the panel 10 resulting from
the deformation of the piezoelectric element 30. Therefore, by joining the housing 60 and the
panel 10, deformation of the panel 10 is inhibited. On the other hand, in the electronic device 1
according to the present invention in which the sheet member 80 is provided, since the
deformation area A of the sheet member 80 is bent and deformed following the deformation
when the panel 10 is deformed, the deformation of the panel 10 is inhibited. hard. As a result,
the electronic device 1 according to the present invention can realize higher sound pressure
characteristics by making it difficult to inhibit the deformation of the panel 10 as compared to
the conventional electronic device. Here, even if the sheet member 80 is repeatedly deformed
following the vibration of the panel 10, the sheet member 80 is flexible to such an extent that
fatigue failure does not occur.
[0044]
The piezoelectric element 30 is attached to the surface of the sheet member 80 opposite to the
surface attached to the panel 10. At this time, when the panel 10 is viewed in a plan view, the
region attached to the panel 10 in the sheet member 80 and the region attached to the
piezoelectric element 30 in the sheet member 80 at least overlap each other. In other words, the
panel 10, the sheet member 80, and the piezoelectric element 30 are stacked via the bonding
member 70 in the bending direction of the piezoelectric element 30 (the vibration direction of
the panel 10, that is, the direction perpendicular to the main surface of the panel 10). It is done.
By having such a configuration, the force generated by the deformation (displacement) of the
piezoelectric element 30 is efficiently transmitted to the panel 10, and as a result, the sound
pressure characteristic of the electronic device 1 is improved.
[0045]
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By the way, in the electronic device 1 in which the piezoelectric element 30 is attached to the
panel 10 as in the present invention, as described above, the panel 10 is directly above the
piezoelectric element 30 in the long side direction of the piezoelectric element 30 It can be seen
that the piezoelectric element 30 is bent so as to be relatively taller. That is, the force generated
by the deformation of the piezoelectric element 30 is most likely to be transmitted immediately
above the piezoelectric element 30 in the panel 10. Therefore, it is important to improve the
sound pressure characteristics that it is difficult to inhibit the vibration of the region immediately
above and in the vicinity of the piezoelectric element 30 in the panel 10. Therefore, in the
present invention, it is preferable to have a configuration in which the deformation area A of the
sheet member 80 is provided in the vicinity of the piezoelectric element 30. On the other hand,
as described above, since it is not preferable that the propagation of the force generated by the
deformation of the piezoelectric element 30 is alleviated by the deformation area A, the
deformation area A of the sheet member 80 is provided immediately above the piezoelectric
element 30. Should be avoided. From the above viewpoint, in the electronic device 1 according to
the present invention, the deformation area A (adjacent to the area where the panel 10 is
attached in the sheet member 80 or the area where the piezoelectric element 30 is attached in
the sheet member 80 Most preferably, a region where neither the housing 60 nor the panel 10 is
attached is formed.
[0046]
Although the PET film, the acrylic film, etc. were shown as an example of the sheet member 80
so far, the material used for a sheet member is not limited to these. For example, a double-sided
tape may be used to bond the members of the electronic device 1, and in this case, the doublesided tape may have a housing between the region bonded to the housing 60 and the region
bonded to the panel 10. The present invention is realized as long as the configuration has a
deformation area A in which neither the body 60 nor the panel 10 is attached.
[0047]
FIG. 7 is a cross-sectional view showing the configuration of the present invention when a
double-sided tape is used as a sheet member. In this configuration, two double-sided tapes having
different lengths (a first double-sided tape 71 as a sheet member and a second double-sided tape
for attaching the first double-sided tape 71 to the panel 10 inside the electronic device 1. Tapes
72) are arranged one on top of the other. In the first double-sided adhesive tape 71, a part of the
double-sided adhesive tape 71 is joined to the panel 10, and another part different from the part
is joined to the housing 60. Specifically, one end of the first double-sided tape 71 is attached to
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15
the panel 10 via the second double-sided tape 72, and the other end opposite to the end in the
extending direction of the first double-sided tape 71 Are attached to the housing 60. In addition,
the piezoelectric element 30 is attached to the surface of the first double-sided tape 71 opposite
to the surface attached to the panel 10. In this configuration, since a double-sided tape is used as
the sheet member, it is not necessary to separately provide a bonding member for attaching the
piezoelectric element to the double-sided tape. Therefore, the structure of the electronic device 1
can be simplified as compared to the case where a PET film or an acrylic film is used as the sheet
member. Further, in the present configuration, since the second double-sided tape 72 intervenes
between the first double-sided tape 71 and the panel 10, the first double-sided tape has a width
equal to that of the second double-sided tape 72. 71 and the panel 10 are separated. Since this
spaced distance is sufficiently larger than the maximum value of the amplitude when the panel
10 vibrates, it is possible to prevent the vibrated panel 10 from contacting the first double-sided
tape 71.
[0048]
The first double-sided adhesive tape 71 is a deformation region in which neither the panel 10
nor the housing 60 is attached between the region joined to the panel 10 and the region joined
to the housing 60 in the double-sided tape 71. I have an A. Here, the first double-sided tape 71
has, for example, a structure in which the upper and lower surfaces of the film are coated with an
adhesive using a PET film as a base material, and can easily be deformed when an external force
is applied. Therefore, since the deformation area A of the first double-sided tape 71 is deformed
following the deformation when the panel 10 is deformed, it is difficult to inhibit the deformation
of the panel 10 and the sound pressure characteristic is improved.
[0049]
The first double-sided tape 71 has, for example, a three-layer structure in which the upper and
lower surfaces of the PET base film are coated with an adhesive. Such a double-sided tape can
form a non-adhesive area which is not coated with an adhesive on the double-sided tape, and the
size of the non-adhesive area can be freely changed. Therefore, in the present configuration, a
region other than the region where the panel 10, the housing 60, or the piezoelectric element 30
is attached in the first double-sided tape 71 can be made a non-adhesive region (in FIG. 7, the
first In the double-sided tape 71, the non-adhesive area 71 (b) and the other area 71 (a) are
shown). With such a configuration, the first double-sided adhesive tape 71 prevents the
deformation areas A from touching and sticking to each other when the deformation area A
bends and deforms following the deformation of the panel 10. be able to.
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[0050]
The configuration of the first double-sided tape 71 is not limited to the above configuration. For
example, in addition to the PET film, an acrylic film or the like may be used as the base material
sandwiched by the pressure sensitive adhesive, and furthermore, a nonwoven fabric film or a
foam may be used. The double-sided tape of the foam is, for example, a double-sided tape
obtained by laminating an acrylic pressure-sensitive adhesive on the upper and lower surfaces of
a polyethylene base having a structure having micro bubbles. Further, the first double-sided tape
71 does not necessarily have to be provided with a non-adhesive area.
[0051]
In the above configuration according to the present invention (FIG. 7), the first double-sided
adhesive tape 71 and the two double-sided adhesive double-sided tapes of the second doublesided adhesive tape 72 are used in an overlapping manner. There is no. The first double-sided
tape 71 as a sheet member may be attached to the panel 10 without the second double-sided
tape 72, that is, only the first double-sided tape 71 may be disposed. In such a case, the
arrangement configuration of the double-sided tape in the inside of the electronic device 1 can be
simplified as compared to the case where two double-sided tapes are overlapped and used.
Further, by providing a non-adhesive area on the first double-sided tape 71, it is possible to form
a deformation area A in which neither the panel 10 nor the housing 60 is attached. An electronic
device with improved characteristics can be configured.
[0052]
FIG. 8 is a diagram showing frequency characteristics of the electronic device according to the
embodiment of the present invention. In FIG. 8, the frequency characteristic 91 of the electronic
device (corresponding to FIG. 5) in which the PET film is disposed as the sheet member 80
between the housing 60 and the panel 10 and the first double-sided tape 71 as the sheet
member 80 are disposed. The frequency characteristic 92 of the electronic device (corresponding
to FIG. 7) and the frequency characteristic 93 of the conventional electronic device (without the
sheet member; corresponding to FIG. 6) are shown. The horizontal axis shows the frequency of
the output voice, and the vertical axis shows the sound pressure.
11-05-2019
17
[0053]
In electronic devices in which a piezoelectric element is attached to a panel, the improvement of
sound pressure in a low frequency band, for example, 300 Hz to 1 kHz, in a frequency band (300
Hz to 3.4 kHz) used in voice communication of a portable telephone It had become. The
frequency characteristics 91 and 92 in the electronic device 1 according to the present invention
show a sound pressure about 1 to 5 dB higher than the frequency characteristic 93 in the
conventional electronic device in the frequency band of approximately 300 Hz to 2.5 kHz, The
improvement of the sound pressure in the low frequency band which has been a conventional
problem is achieved. This is because the electronic device 1 according to the present invention
has a structure that does not easily inhibit the deformation of the panel 10. In addition, since the
difference between the frequency characteristic 91 and the frequency characteristic 92 is hardly
observed, there is almost no difference in the influence on the sound pressure characteristic by
the material of the sheet member 80 (PET film or double-sided tape). If it is, you may apply the
thing of what kind of material.
[0054]
In the embodiment of the present invention described above, an example in which a sheet
member having a substantially planar shape is provided as a member capable of bending and
deforming is taken, but the shape of the sheet member is not limited to the planar shape.
[0055]
FIG. 9 is a cross-sectional view showing a plurality of modified examples of the configuration of
the present invention.
In this modification, a substantially L-shaped double-sided tape 70 (or 71) is disposed inside the
electronic device 1 as a sheet member. The double-sided adhesive tapes 70 and 71 have a shape
that is substantially vertically bent so as to have a surface parallel to the panel 10 and a surface
parallel to the housing 60 of the electronic device 1. The surface of the double-sided adhesive
tapes 70 and 71 parallel to the panel 10 is partially joined to the panel 10, while the surface
parallel to the upper surface of the electronic device 1 is joined to the housing 60. Further, in the
surface of the double-sided adhesive tapes 70 and 71 parallel to the panel 10, a deformation area
A where neither the panel 10 nor the housing 60 is attached is formed. The deformation area A
is formed between the area joined to the panel 10 in the double-sided tapes 70 and 71 and the
11-05-2019
18
area joined to the housing 60. Since the deformation area A of the double-sided adhesive tape 70,
71 follows the deformation when the panel 10 is deformed, it is difficult to inhibit the
deformation of the panel 10, and the sound pressure characteristics are improved. At this time,
the double-sided tapes 70 and 71 are disposed such that the deformation area A is substantially
parallel to the panel 10. Therefore, the deformation area A is bent and deformed in a direction
substantially parallel to the vibration (deformation) direction of the panel 10.
[0056]
In the configuration shown in FIG. 9A, two double-sided tapes of a first double-sided tape 71 and
a second double-sided tape 72 are used, and the first double-sided tape 71 is the end of the plane
parallel to the panel 10 It has a shape which is continuous from the portion and is bent
substantially vertically toward the back side of the electronic device 1. In addition, the
piezoelectric element 30 is attached to the surface of the first double-sided tape 71 opposite to
the surface attached to the panel 10. An area other than the area where the panel 10, the
housing 60, or the piezoelectric element 30 is attached in the first double-sided tape 71 is a nonadhesive area (71 (b)).
[0057]
FIG. 9B shows a configuration in which the edge of the panel 10 is covered by a bezel provided
continuously to the housing 60 for the purpose of improving the impact resistance of the
electronic device 1 or the like. In the present configuration, the double-sided tape 70 as a sheet
member is substantially L-shaped having a plane parallel to the panel 10 and a plane parallel to
the upper side surface of the electronic device 1. The surface of the double-sided tape 70 parallel
to the upper side surface of the electronic device 1 is attached to the housing 60 along the bezel
of the housing 60. Further, the surface parallel to the panel 10 in the double-sided adhesive tape
70 is extended outward beyond the panel 10, and the extended region is not joined to the
housing 60, so the deformable region (deformation region A ). In this configuration, although the
deformation area A is not covered by the panel 10, since it is covered by the bezel of the housing
60, the double-sided tape 70 is not exposed and viewed. Further, also in this configuration, a
non-adhesive region may be appropriately provided on the double-sided tape 70 in the same
manner as the configuration of FIG. 9 (a).
[0058]
11-05-2019
19
The configuration shown in FIG. 9C is a case where in the configuration of FIG. 9B, the doublesided tape as a sheet member and the double-sided tape for attaching the piezoelectric element
30 are integrated. In such a case, the arrangement configuration of the double-sided tape with
respect to the electronic device 1 is simplified as compared with the configuration of FIG. 9B, for
example, the piezoelectric element 30 is closer to the upper surface of the housing 60 It is
possible to arrange the area where the display unit 20 can be arranged. In addition, when the
piezoelectric element 30 is provided at a position close to the upper side surface of the housing
60, other members constituting the upper side surface of the housing 60 may approach the
piezoelectric element 30. In the electronic device 1 having such a configuration, the piezoelectric
element 30 is in contact with another member such as a corner portion or an electronic
component protruding inside the housing 60 due to an impact due to a drop or the like, and the
piezoelectric element 30 is broken. There is a risk of Therefore, the piezoelectric element 30 may
be covered with a buffer member 90 made of a rubber molding material or the like to absorb the
external force, thereby reducing the propagation of the impact to the piezoelectric element 30.
Although FIG. 9C shows a configuration in which the surface of the piezoelectric element 30
other than the surface attached to the panel 10 is covered with the buffer member 90, the shape
of the buffer member 90 is not limited to this, and a plate shape is used. And may be attached to
the surface of the piezoelectric element 30 opposite to the surface attached to the panel 10.
Alternatively, the buffer member 90 may be provided by dropping an ultraviolet curable resin or
the like on the surface of the piezoelectric element 30 opposite to the surface attached to the
panel 10 and solidifying the resin.
[0059]
FIG. 10 is a sectional view showing a plurality of further modified examples of the configuration
of the present invention. In this modification, in the configuration shown in FIG. 9, the
deformation direction of the deformation area A of the double-sided tape 70 as a sheet member
is substantially perpendicular to the vibration (deformation) direction of the panel 10. In the
present modified example, the double-sided tape 70 as a sheet member has a substantially L
shape including a plane parallel to the panel 10 and a plane parallel to the upper side surface of
the electronic device 1. The surface of the double-sided tape 70 parallel to the panel 10 is joined
to the panel 10. On the other hand, in the plane parallel to the upper side surface of the
electronic device 1, a part of the plane is joined to the housing 60. Further, in a plane parallel to
the upper side surface of the electronic device 1 in the double-sided tape 70, a deformation area
A in which neither the panel 10 nor the housing 60 is attached is formed. The deformation area
A is formed between an area joined to the panel 10 in the double-sided tape 70 and an area
joined to the housing 60. Since the deformation area A of the double-sided tape 70 deforms
following the deformation when the panel 10 is deformed, it is difficult to inhibit the deformation
11-05-2019
20
of the panel 10 and the sound pressure characteristics are improved. At this time, the doublesided tape 70 is disposed such that the deformation area A is substantially perpendicular to the
panel 10. Therefore, the deformation area A is bent and deformed in a direction substantially
perpendicular to the vibration (deformation) direction of the panel 10.
[0060]
In the present invention, the sheet member 80 can be arranged so that the deformation area A of
the sheet member 80 is in any direction perpendicular to the direction parallel to the
deformation (vibration) direction of the panel 10. That is, the arrangement direction of the
deformation area A is not limited in the present invention. Therefore, the degree of freedom in
the arrangement of the sheet members in the electronic device 1 is high.
[0061]
In the configuration shown in FIG. 10A, a double-sided tape as a sheet member and a doublesided tape for attaching the piezoelectric element 30 are separately disposed. By having such a
configuration, the propagation of the force generated by the deformation of the piezoelectric
element 30 is not alleviated by the deformation area A of the double-sided tape 70.
[0062]
The configuration shown in FIG. 10B is a case where a double-sided tape as a sheet member and
a double-sided tape for attaching the piezoelectric element 30 are integrated. In such a case, the
arrangement configuration of the double-sided tape with respect to the electronic device 1 can be
simplified as compared with the case where the double-sided tape as the sheet member and the
double-sided tape for attaching the piezoelectric element 30 are separately provided.
[0063]
FIG. 11 is a view for explaining the cross-sectional structure at different positions in the short
side direction of the main surface of the electronic device 1. FIG. 11A shows a substantially Lshaped sheet member (double-sided tape 71) provided inside the electronic device 1. The double-
11-05-2019
21
sided tape 71 shown in FIG. 11A has, for example, a surface attached to the panel 10 and a
surface attached to the housing 60 in the same manner as the configuration of FIG. The surface
attached to the panel 10 is the side 11a parallel to the short side of the panel 10 (ie, the short
side of the main surface of the electronic device 1) and the long side of the panel 10 (ie, the long
side of the main surface of the electronic device 1). And a side 11b parallel to the), and a
substantially rectangular surface. The surface attached to the housing 60 is a substantially
rectangular surface including a side 11 c parallel to the short side of the main surface of the
electronic device 1 and a side 11 d parallel to the thickness direction of the electronic device 1.
The length of the side 11 c in the surface attached to the housing 60 is shorter than the length of
the side 11 a in the surface attached to the panel 10. Further, on the surface attached to the
panel 10, a non-adhesive area 71 (b) having a width shorter than the side 11c of the surface
attached to the housing 60 is formed. The non-adhesive area 71 (b) is formed on the side
opposite to the side to be attached to the panel 10. Therefore, this area is not joined to the
housing 60.
[0064]
FIG.11 (b) is sectional drawing in alignment with XX in FIG. 11 (a). In FIG. 11 (b), not only the
double-sided tape 71 but also members constituting the electronic device 1 are shown together.
In FIG. 11B, the surface of the double-sided tape 71 parallel to the panel 10 is attached to the
panel 10, while the surface opposite to the surface attached to the panel 10 is attached to the
housing 60.
[0065]
FIG. 11C is a cross-sectional view taken along the line Y-Y in FIG. 11C (in addition to the doublesided tape 71, members constituting the electronic device 1 are also illustrated). In FIG. 11C, the
surface of the double-sided tape 71 parallel to the panel 10 is attached to the panel 10, while the
surface opposite to the surface attached to the panel 10 is attached to the housing 60.
Furthermore, a plane parallel to the upper side surface of the electronic device 1, which is bent
and extended from a plane parallel to the panel 10, is also attached to the housing 60. In such a
case, it is possible to attach the panel 10 and the housing 60 more firmly than the configuration
shown in FIG. 11B (cross section X-X).
[0066]
11-05-2019
22
FIG. 11D is a cross-sectional view taken along the line Z-Z in FIG. 11C (in addition to the doublesided tape 71, members constituting the electronic device 1 are also illustrated). In FIG. 11 (d),
the surface of the double-sided tape 71 parallel to the panel 10 is attached to the panel 10, but
the surface opposite to the surface attached to the panel 10 is the non-adhesive area (71 (b) And
is not attached to the case 60. On the other hand, a plane parallel to the upper side surface of the
electronic device 1, which is bent and extended from a plane parallel to the panel 10, is attached
to the housing 60. Here, the surface of the double-sided adhesive tape 71 parallel to the upper
surface of the electronic device 1 is not attached to the entire surface of the surface of the case
60 but the non-adhesive region (71 (b)) of the double-sided adhesive tape 71 The area | region
corresponding to the thickness width of the non-adhesive layer in in is not attached to the
housing | casing 60. FIG. Here, the non-adhesive layer is a layer formed of the adhesive when the
intermediate layer of the double-sided tape 71 is covered with the adhesive, and the thickness
width of the non-adhesive layer is formed of the adhesive. Thickness of the layer to be As
compared with the cross section along the YY line, the cross section along the Z-Z line is not
coated with the adhesive on the side opposite to the side attached to the panel 10 in the doublesided tape 71, so The double-sided tape 71 becomes thinner by the thickness width of the layer
to be formed. Therefore, in the cross section along the Z-Z line, the double-sided tape 71 is not
coated with the adhesive, and is separated from the housing 60 by the amount of reduced
thickness. The width A at which the double-sided adhesive tape 71 is separated from the housing
60 corresponds to the width of the area not attached to the housing 60 on the surface of the
double-sided adhesive tape 71 parallel to the upper side surface of the electronic device 1. This
area is a deformation area A, and since it deforms following the deformation when the panel 10
is deformed, it is difficult to inhibit the deformation of the panel 10 and the sound pressure
characteristic is improved.
[0067]
As described above, in the cross-sectional structure of the electronic device 1, the double-sided
adhesive tape 71 has at least three configurations (FIGS. 11B to 11D). The area occupied in the
short side direction of the main surface of the electronic device 1 by these three types of
structures, that is, the cross-sectional structures along the XX, YY and ZZ lines is a double-sided
tape 71 It is possible to adjust appropriately by changing the shape of. For example, by adjusting
the length of the side 11c with respect to the side 11a, the fixing strength of the panel 10 and
the housing 60 by the double-sided tape 71 can be adjusted. In addition, if the width of the side
11e (the width of the deformation area A in the short side direction of the main surface of the
electronic device 1) to the side 11a is increased (that is, if the width of the non-adhesive area is
increased), the sound pressure characteristic is improved. It can be done.
11-05-2019
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[0068]
Here, in the electronic device 1 according to the present invention, when the fixing strength with
the housing 60 at the left and right end portions (ends at the short side of the panel 10) of the
panel 10 is low, the left and right end portions of the panel 10 vibrate largely . At this time,
depending on the frequency of the drive signal, the vibration may occur in the opposite phase to
the vibration of the piezoelectric element 30, and the sound pressure characteristic of the
electronic device 1 may be deteriorated. Therefore, in the present invention, the panel 10 and the
housing 60 are firmly fixed by the double-sided adhesive tape 71 at the left and right ends of the
panel 10, and a non-adhesive area is provided on the double-sided adhesive tape 71 except for
the left and right ends. It is desirable to form the deformation area A. In addition, since the
deformation area A in the double-sided tape 71 as the sheet member can change the width of the
area in the short side direction of the panel 10 as described above, the length of the width is
appropriately adjusted. Therefore, both the improvement of the sound pressure characteristic by
providing the deformation area A and the improvement of the sound pressure characteristic by
fixing the housing 60 with the casing 60 without providing the deformation area A at the left and
right end portions of the panel 10 are compatible. be able to. Also, in order to fix the left and
right end portions of the panel 10 firmly to the housing 60, for example, an adhesive having
higher adhesion than the double-sided tape 71 is coated on the double-sided tape 71 and fixed
by the adhesive. The configuration may be Further, instead of applying the adhesive on the
double-sided tape 71, a part of the double-sided tape 71 is pulled out, and the space formed is
filled with the adhesive so that the panel 10 and the housing 60 are fixed. Also good. The
adhesive used here is, for example, a non-heat-curable adhesive, or a moisture-curable elastic
adhesive which reacts with moisture (moisture) in the air to cure. The moisture-curable elastic
adhesive contains, for example, a special polymer containing a silyl group as a main component.
[0069]
FIG. 12 is a cross-sectional view showing the configuration of the present invention when a
shatterproof sheet is used as the sheet member. The shatterproof sheet 110 is a member
provided to prevent scattering of fragments of the glass panel due to an impact on the electronic
device 1. The shatterproof sheet 110 is attached to the surface of the panel 10 on the inner side
of the electronic device 1 via a colorless and transparent adhesive or the like. The display unit 20
is attached to the surface of the anti-scattering sheet 110 opposite to the surface attached to the
panel 10 via a colorless transparent adhesive or the like, and the piezoelectric element 30 is
attached via a double-sided tape or the like. It is attached. Furthermore, the area of the
shatterproof sheet 110 located on the upper side of the electronic device 1 is attached to the
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housing 60 via a double-sided tape or the like.
[0070]
The shatterproof sheet 110 partially includes an area not attached to the panel 10 on the upper
side of the electronic device 1. Between the area attached to panel 10 and the area attached to
housing 60, anti-scattering sheet 110 is an area where neither panel 10 nor housing 60 is
attached, that is, a deformation area A. Have. Since the deformation area A deforms following the
deformation when the panel 10 is deformed, it is difficult to inhibit the deformation of the panel
10 and the sound pressure characteristic is improved.
[0071]
Although FIG. 12 shows the case where the shatterproof sheet 110 is used as the sheet member,
a touch panel may be provided instead of the shatterproof sheet 110. The touch panel is
obtained by forming a transparent conductive film layer of indium tin oxide or the like on the
surface of a plastic film by, for example, sputtering. A flexible plastic film is used as a base
material of the touch panel, so that bending deformation is possible, and accordingly, it is
possible to provide a deformation region on the touch panel and to deform following the
deformation of the panel 10.
[0072]
So far, the configuration in which the sheet member 80 is provided in the electronic device in
which the piezoelectric element 30 is attached to the panel 10 has been described, but the
present invention is not limited to such a configuration. The present invention is realized even if
the sheet member 80 is provided in the electronic device to which the piezoelectric element 30 is
attached.
[0073]
FIG. 13 is a cross-sectional view showing a configuration in which the piezoelectric element 30 is
attached to the housing 60 in the embodiment of the present invention.
11-05-2019
25
The housing 60 includes a rear case (first housing portion) 61 and a cover member (second
housing portion) 62 which can be attached to and detached from the rear case 61. The cover
member 62 is, for example, a battery cover made of polycarbonate. The panel 10 is attached to
the rear case 61. The display unit 20 and the input unit 40 are also attached to the rear case 61
(not shown). The piezoelectric element 30 is attached to the surface of the cover member 62 on
the inner side of the electronic device 1 via the sheet member 80. The cover member 62 to which
the piezoelectric element 30 is attached deforms according to the displacement of the
piezoelectric element 30 and vibrates. For this reason, the cover member 62 generates air
conduction noise. Further, the cover member 62 transmits the human body vibration sound to
the object contacting the cover member 62.
[0074]
In the sheet member 80, a part of the sheet member 80 is joined to the cover member 62 via the
joining member 70, and another part different from the part is joined to the rear case 61 via the
joining member 70. The seat member 80 is a deformation in which neither the cover member 62
nor the rear case 61 is attached between the region attached to the cover member 62 and the
region attached to the rear case 61 in the sheet member 80. It has an area A. Since the
deformation area A deforms following the deformation when the cover member 62 is deformed,
it is difficult to inhibit the deformation of the cover member 62, and the sound pressure
characteristic is improved.
[0075]
Although the present invention has been described based on the drawings and embodiments, 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, in a double-sided
tape as a sheet member, a non-adhesive area is provided on a substrate such as a PET film by not
covering an adhesive, but the present invention is not limited thereto. It is also possible to
provide a non-adhesive area by coating a fine powder consisting of an organic substance, an
inorganic substance or an organic-inorganic complex, or coating a plastic sheet or the like having
no adhesiveness. Further, although a double-sided tape as a sheet member is used as a modified
example of the present invention, it is apparent that a PET film, an acrylic film or the like may be
used instead of the double-sided tape. In addition, although the bonding member for attaching
the display unit 20 to the panel 10 and the bonding member for attaching the piezoelectric
element 30 to the panel 10 are separately provided, the present invention is not limited to this.
11-05-2019
26
The bonding member may be integrally disposed in the electronic device 1. Moreover, although
the structure using a double-sided tape was demonstrated for joining to the sheet | seat member
80 and the panel 10 or the housing | casing 60, it is not limited to this, You may use an adhesive,
an adhesive agent, etc. Further, although the embodiment of the present invention has been
described by taking a smart phone as an example, the present invention can be realized even
with a foldable mobile phone.
[0076]
Further, the electronic device 1 according to the present invention has the following features.
[0077]
In the electronic device 1, the panel 10 has one end of the panel 10 attached to the housing 60
by the joining member 70, while the other end of the panel 10 opposite to the one end is the
housing via the sheet member. In the sheet member 80, a part of the sheet member 80 is joined
to the panel 10, while the other part different from the part is joined to the housing 60. The
fixing strength between the other end and the housing 60 is lower than the fixing strength
between the one end of the panel 10 and the housing 60.
[0078]
DESCRIPTION OF SYMBOLS 1 electronic device 10 panel 20 display part 30 piezoelectric
element 40 input part 50 control part 60 case 61 rear case 62 cover member 70 joining member
71 1st double-sided tape 72 2nd double-sided tape 80 sheet member 90 buffer member 110
scattering prevention Sheet
11-05-2019
27
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