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JP2014027619

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2014027619
Abstract: The present invention provides an electronic device capable of reducing sound leakage
from a housing or the like vibrated by a vibrating body and echo due to the sound leakage. An
electronic device 1 generates an air conduction sound and a vibration sound transmitted through
a human body by vibrating a panel 10, a panel holding portion (65a, 65b) holding the panel 10,
and the panel 10. The rigidity of the panel holding portion (65a, 65b) in the vicinity of the
position where the element 30 is installed, the rigidity of the panel holding portion (65a, 65b) in
the vicinity of the position where the element 30 is installed It is characterized by having raised.
[Selected figure] Figure 3
Electronics
[0001]
The present invention is an electronic apparatus that vibrates a panel by applying a
predetermined electric signal (sound signal) to a piezoelectric element and transmits air
conduction noise and vibration noise to a user by transmitting vibration of the panel to a human
body. It is about
[0002]
Patent Document 1 describes an electronic device such as a mobile phone that transmits airconduction sound and bone-conduction sound to a user.
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1
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. Patent Document 1 also describes that bone conduction
sound is sound transmitted to the user's auditory nerve through a part of the user's body (for
example, the cartilage of the outer ear) that contacts the vibrating object. ing.
[0003]
In the telephone set described in Patent Document 1, it is described that a short plate-like
vibrator made of a piezoelectric bimorph and a flexible material is attached to the outer surface
of a housing through an elastic member. Further, 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 bone conduction sound are transmitted to the user.
[0004]
JP 2005-348193 A
[0005]
However, in the electronic device described in Patent Document 1, since the area of the vibrating
portion is small, the problem of sound leakage when a wide panel is vibrated is not considered at
all.
[0006]
An object of the present invention is to provide an electronic device capable of reducing sound
leakage from the electronic device.
[0007]
An electronic device according to the present invention comprises: a panel; a panel holding unit
for holding the panel; and an element for generating an air conduction sound and an oscillating
sound transmitted through a human body by vibrating the panel; The rigidity in the vicinity of
the position where the element is installed in the panel holding unit is higher than the rigidity in
the vicinity of the position where the element is installed in the panel holding unit.
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[0008]
The rigidity of the panel holding portion may be the bending rigidity of the panel holding
portion.
[0009]
The glass of the material of the panel holding portion that holds the panel at a position other
than the vicinity of the position where the element is installed than the content of the glass fiber
of the material of the panel holding portion that holds the panel near the position where the
element is installed The fiber content may be increased.
[0010]
Even if the panel holding unit holding the panel at a position other than the vicinity of the
position where the element is installed contains a material with higher rigidity than the panel
holding unit that holds the panel near the position where the element is installed. Good.
[0011]
Insert a plate-like member that is more rigid than the panel holder that holds the panel near the
position where the element is installed, in the panel holder that holds the panel at a position
other than the position where the element is installed. It is also good.
[0012]
The panel holding portion holding the panel other than the vicinity of the position where the
element is installed becomes thicker in the normal direction of the panel than the panel holding
portion that holds the panel in the vicinity of the position where the element is installed You may
[0013]
The thickness of the panel holding portion in the normal direction of the panel may be gradually
increased as the distance from the panel holding portion holding the panel in the vicinity of the
position where the element is installed is increased.
[0014]
The thickness of the panel holding portion in the normal direction of the panel may be changed
at a position separated by a predetermined distance from the panel holding portion holding the
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panel in the vicinity of the position where the element is installed.
[0015]
According to the present invention, it is possible to provide an electronic device capable of
reducing sound leakage from a housing or the like vibrated by a vibrator and echo due to the
sound leakage.
[0016]
It is a figure which shows the mounting structure of the electronic device which concerns on one
Embodiment of this invention.
It is a figure which shows the example of the suitable shape of the panel of the electronic device
shown in FIG.
It is a figure which shows the cross section of the electronic device shown in FIG.
It is sectional drawing which shows the mounting structure of the modification of the electronic
device shown in FIG.
It is sectional drawing which shows the mounting structure of the other modification of the
electronic device shown in FIG.
[0017]
Hereinafter, embodiments of the present invention will be described in detail with reference to
the drawings.
FIG. 1 is a view showing a mounting structure of an electronic device 1 according to an
embodiment of the present invention.
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FIG. 1 is a view schematically showing a state in which the main part of the mounting structure
of the electronic device 1 is viewed in plan.
[0018]
The electronic device 1 is, for example, a mobile phone terminal (smart phone), and the panel 10,
the touch sensor 15, the display unit 20, the piezoelectric element 30, the input unit (key) 40, the
substrate 50, and the housing 60 , A panel holding portion 65, and a joining member 70.
[0019]
As shown in FIG. 1, the electronic device 1 includes a panel 10, an input unit 40, and a housing
60 in an appearance in plan view.
Further, since the touch sensor 15, the display unit 20, the piezoelectric element 30, and the
bonding member 70 are disposed on the back surface side of the panel 10, they are shown by
broken lines in FIG.
[0020]
The panel 10 is, for example, a touch panel that detects a touch and a cover panel that protects
the display unit 20.
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.
[0021]
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The touch sensor 15 detects a touch on the panel 10 such as a user's finger, a pen, or a stylus
pen.
As a detection method of the touch sensor, any method such as a capacitance method, a resistive
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.
When the panel 10 has a touch sensing function, the touch sensor 15 can be omitted.
[0022]
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 side of the panel 10. For example, the touch sensor
15 can be disposed on the back side of the panel 10 by a bonding member (for example, an
adhesive), and the display unit 20 can be similarly disposed on the back side of the touch sensor
15. When the panel 10 has a touch sensing function, the display unit 20 may be disposed on the
back of the panel 10 by a bonding member (for example, an adhesive). Alternatively, the display
unit 20 may be separated from the panel 10 and supported by the housing of the electronic
device 1.
[0023]
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, about 10 to 30 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. The unimorph stretches when an electrical signal (voltage) is applied, and the bimorph
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bends when an electrical signal (voltage) is applied. In addition, as long as it can generate
vibration, it is not limited to the piezoelectric element, and various known elements for vibration
excitation can be used.
[0024]
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 by a
predetermined distance in a state of being disposed on the back surface of the panel 10. The
piezoelectric element 30 may be separated from the surface on the inner side of the housing 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
may be larger than the maximum amount of deformation of the piezoelectric element 30.
[0025]
The input unit 40 receives an operation input from the user, and includes, for example, operation
buttons (operation keys). Note that the input unit 40 is not limited to the keys provided at the
three places shown in FIG. 1, and can be an arbitrary number of keys, buttons, etc. provided at
arbitrary places. When the panel 10 is a touch panel, the panel 10 can also receive an operation
input from the user by detecting a touch by the user.
[0026]
As described later, the substrate 50 is disposed on the back side of the display unit 20. Various
components such as a control unit can be mounted on the substrate 50. Here, the control unit is
a processor that controls the electronic device 1. The control unit applies, to the piezoelectric
element 30, a predetermined electric signal (a voice corresponding to the other party's voice or a
ring tone, or a voltage corresponding to an acoustic signal such as music including music). The
sound signal may be based on music data stored in the internal memory, or music data stored in
an external server or the like may be reproduced via a network.
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[0027]
When an electrical signal is applied 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 deforms in accordance with the expansion or contraction or
bending of the piezoelectric element 30, and the panel 10 bends and vibrates. Here, the
maximum voltage of the electric signal applied to the piezoelectric element 30 by the control unit
mounted on the substrate 50 is, for example, a voltage applied to a so-called panel speaker for
the purpose of conducting sound by air conduction sound instead of vibration sound. It may be
± 15 V, higher than ± 5 V. Thus, even when the user presses the panel 10 against his / her
body with a force of, for example, 3 N or more (averagely 5 N to 10 N), sufficient bending
vibration is generated in the panel 10 and used. Vibration noise can be generated through a part
of the person's body (for example, the cartilage of the outer ear). 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.
[0028]
The panel 10 bends and 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 a relatively large portion of the vibration amplitude and a
relatively small portion of the vibration are distributed randomly or periodically in a wide area of
the panel 10 at first glance. That is, vibration of a plurality of waves is detected over a wide 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 control unit applies the voltage to the piezoelectric element 30 so that
the above-described vibration of the panel 10 does not attenuate. Maximum voltage may be. +-.
15V. Therefore, the user can hear the sound by bringing the ear into contact with the area apart
from the mounting area of the piezoelectric element 30 described above, for example, the central
portion of the panel 10.
[0029]
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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. 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 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.
[0031]
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.
[0032]
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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 lets gas pass but can not pass liquid. The part that is
permeable to gas but not liquid is, for example, Gore-Tex®.
[0033]
FIG. 3 schematically shows a cross section of the electronic device 1 shown in FIG. FIG. 3A is a
cross-sectional view taken along the line aa of FIG. FIG. 3B is a cross-sectional view taken along
the line b-b in FIG. The electronic device 1 illustrated in FIG. 3 is a smartphone in which a
substantially rectangular glass plate in a plan view is disposed on the front surface of a housing
60 (for example, a case of metal or resin) as the panel 10.
[0034]
As shown in FIG. 3A, the panel 10 is made of, for example, glass or acrylic, and is supported
(held) by a panel holding portion 65 formed in the housing 60. In FIG. 3A, the upper edge of the
panel 10 (near the right edge of the panel 10 shown in the figure) is held by the panel holding
portion 65a, and the lower edge of the panel 10 is near the left edge (left of the panel 10 shown
in the figure). ) Is held by the panel holder 65b. As shown in FIG. 3A, the panel 10 is preferably
fixed to the panel holding portions 65 a and 65 b via the joining member 70. The bonding
member 70 is an adhesive having a thermosetting property, an ultraviolet ray curing property, or
the like, 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.
[0035]
The panel holding portions 65a and 65b may be formed as members separate from the housing
60 and may be adhered to the housing 60 with an adhesive or a double-sided tape, or may be
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integrally molded with the housing 60. . The panel 10, the touch sensor 15, the display unit 20,
and the piezoelectric element 30 each have a substantially rectangular shape.
[0036]
Moreover, the touch sensor 15 and the display part 20 are joined to the panel 10 by the back
surface except the edge vicinity of the panel 10 in planar view. In this case, the touch sensor 15
and the display unit 20 can be bonded to the back surface of the panel 10 via a bonding member
or the like, but in FIG. 3A, illustration of the bonding members for bonding them is omitted. . In
FIG. 3A, the touch sensor 15 and the display unit 20 are fixed to the panel 10 from the inside of
the housing 60. In this case, a bonding member for fixing the touch sensor 15 and the display
unit 20 to the panel 10 may also be an adhesive having thermosetting or ultraviolet curing
properties, a double-sided tape, etc. For example, a colorless transparent acrylic UV curing
adhesive It may be an optical elastic resin.
[0037]
The display unit 20 is disposed substantially at the center of the panel 10 in the short side
direction together with the touch sensor 15. 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. As shown in
FIG. 3A, the fixed portion of the piezoelectric element 30 is located outside the overlapping
region of the panel 10 and the display unit 20 in plan view. The piezoelectric element 30 has a
substantially rectangular shape in a plan view, and is joined such that the long side thereof is
along the short side of the panel 10.
[0038]
Further, the input unit 40 may include at least one key in the present embodiment, and may
include a plurality of keys as illustrated in the example including three keys in FIG. 1. As shown
in FIG. 3, the input unit 40 and the piezoelectric element 30 supported by the panel 10 to vibrate
the panel 10 are disposed at positions facing each other with reference to the central portion of
the panel 10. As shown in FIG. 3A, the input unit 40 is supported (held) by the housing 60 and
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the substrate 50. That is, in the present embodiment, the top side of the input unit 40 is held by
the housing 60, and the bottom side of the input unit 40 is held by the substrate 50. In FIG. 3,
illustration of elements such as various components disposed on the substrate 50 is omitted. In
addition, the substrate 50 can be supported and fixed by the housing 60 or various members
provided in the housing 60 or the like. Since various mechanisms for supporting the substrate 50
inside the housing 60 are assumed, in FIG. 3, the illustration of the elements for supporting the
substrate 50 is omitted.
[0039]
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. That is, the electronic device 1 according
to the present embodiment vibrates the air conduction sound and the vibration sound
transmitted through the human body by vibrating the panel 10, the panel holding portions 65a
and 65b holding the panel 10, and the panel 10. And a piezoelectric element 30 to be generated.
[0040]
As a result, air conduction noise and vibration noise can be transmitted to the user without
causing the vibrating body to protrude to the outer surface of the housing 60, so that a very
small vibrating body is brought into contact with the human body as compared to the housing.
The usability is improved more than the electronic device described in 1. Further, since it is not
necessary to put the user's ear on the piezoelectric element itself, the piezoelectric element 30
itself is unlikely to be damaged. In addition, when it is attempted to generate vibration by
deforming the case 60 instead of the panel 10, the user is likely to drop the terminal, but when
the panel 10 is vibrated, such a thing happens. Hateful.
[0041]
Further, as described above, it is desirable that the piezoelectric element 30 be joined to the
panel 10 by the joining member 70. In this way, the piezoelectric element 30 can be attached to
the panel 10 in a state in which the freedom of deformation of the piezoelectric element 30 is not
easily inhibited. Further, the bonding member 70 can be made of a non-heat curable adhesive.
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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 bonding member 70 can also be a
double-sided tape. In this way, there is an advantage that a contraction stress as in the use of an
adhesive does not easily occur between the piezoelectric element 30 and the panel 10.
[0042]
Furthermore, in the present embodiment, the rigidity of the panel holding portion 65 for holding
the panel 10 is partially changed. That is, in the present embodiment, for example, as shown in
FIG. 3B, the rigidity of the panel holding portion 65a and the rigidity of the panel holding portion
65b are made different. In this case, the rigidity of the panel holding portion 65b for holding the
panel 10 other than the vicinity of the position where the piezoelectric element 30 is installed is
greater than the rigidity of the panel holding portion 65a for holding the panel 10 near the
position where the piezoelectric element 30 is installed. Make it higher.
[0043]
Here, rather than the rigidity of the panel holding portion 65a holding the panel 10 near the
position where the piezoelectric element 30 is installed, the rigidity of the panel holding portion
65b holding the panel 10 other than the position near the position where the piezoelectric
element 30 is installed The configuration to be raised can assume various aspects. Preferably, the
rigidity of the panel holding portion 65 can be the bending rigidity of the panel holding portion
65.
[0044]
For example, the panel holding device holds a panel at a position other than the vicinity of the
position where the piezoelectric element 30 is installed than the content of the glass fiber of the
material of the panel holding portion 65a that holds the panel near the position where the
piezoelectric element 30 is installed. You may increase content of the glass fiber of the raw
material of the part 65b. As described above, by increasing the content of the glass fiber, the
material constituting the panel holding portion 65b becomes hard, so the rigidity becomes higher
than that of the panel holding portion 65a.
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[0045]
Also, for example, the panel holding portion 65b that holds a panel at a position other than the
position where the piezoelectric element 30 is installed is more rigid than the panel holding
portion 65a that holds the panel near the position where the piezoelectric element 30 is installed.
It may contain a material of high That is, when the panel holding portion 65a and the panel
holding portion 65b contain different materials, the material constituting the panel holding
portion 65b can be hardened to make the rigidity higher than that of the panel holding portion
65a.
[0046]
Furthermore, for example, the panel holding portion 65b holding a panel at a position other than
the position near the position where the piezoelectric element 30 is installed is more rigid than
the panel holding portion 65a holding a panel near the position where the piezoelectric element
30 is installed. A tall plate-like member may be inserted. For example, a sheet metal having a
predetermined thickness may be insert-molded in the panel holding portion 65b, and the sheet
metal may not be insert-molded in the panel holding portion 65a. Thus, the rigidity of the said
part can be made high by insert-molding a sheet metal partially to a panel holding part.
[0047]
As described above, in the present embodiment, the region far enough from the position where
the piezoelectric element 30 is installed, for example, the housing, than the rigidity of the panel
holding portion 65a that holds the panel 10 near the position where the piezoelectric element 30
is installed. The rigidity of the panel holding portion 65b for holding the panel 10 is increased in
the vicinity of the lowermost portion of the panel. As a result, the panel 10 is held by the
relatively rigid panel holding portion 65b in a region far enough from the position where the
piezoelectric element 30 is installed, so that the vibration is reduced even if the piezoelectric
element 30 vibrates. . That is, in the panel 10, it can reduce that the area which vibrates strongly
becomes too wide. For this reason, in the electronic device according to the present embodiment,
when the piezoelectric element 30 vibrates the panel 10, sound leakage from a housing or the
like due to the panel 10 vibrating other than the vicinity of the position where the piezoelectric
element 30 is installed. Can be reduced. Further, in the electronic device 1 according to the
present embodiment, for example, when a microphone for collecting the voice of the user is
disposed in the vicinity of the input unit 40 or the like, it is possible to reduce the echo due to the
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sound leakage.
[0048]
On the other hand, since the panel 10 in the vicinity of the position where the piezoelectric
element 30 is installed is held by the relatively low rigidity panel holding portion 65a, it is
difficult to suppress the vibration when the piezoelectric element 30 vibrates. For this reason, in
the electronic device 1 according to the present embodiment, the piezoelectric element 30
vibrates the panel 10 in the vicinity of the position where the piezoelectric element 30 is
installed, thereby causing air conduction noise and vibration noise transmitted through the
human body. Can be generated well.
[0049]
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.
[0050]
For example, although the electronic device 1 has been described on the assumption that the
electronic device 1 is a mobile phone or a smart phone in the embodiment described above, the
electronic device 1 according to the present invention is not limited to these terminals. The
electronic device 1 according to the present invention vibrates a panel held by a panel holding
unit, such as a tablet PC or a dedicated terminal for a specific application, to generate air
conduction noise and vibration noise transmitted through the human body. Various electronic
devices provided with a piezoelectric element can be obtained.
[0051]
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15
Also, for example, in the embodiment described above, attaching the display unit 20 to the panel
10 is not essential. For example, when the display unit 20 is fixed to a part of the housing 60
without fixing the display unit 20 to the panel 10, the vibration of the entire panel 10 is large
compared to when the display unit 20 is attached to the panel 10. Become.
[0052]
Further, for example, in the case where 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 The vibration noise can be
recognized even by touching it. The number of the piezoelectric elements 30 mounted is not
limited to one, and a plurality may be mounted.
[0053]
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. Further,
the input unit 40 includes the touch sensor 15 of the embodiment described above. Further, the
input unit 40 includes, for example, a sheet key which is a member which is integrally formed
with the key tops of the operation keys in the foldable portable telephone and which constitutes
one surface of the operation unit side housing.
[0054]
Furthermore, as a modification of this embodiment, the thickness of the panel holding portion 65
in the normal direction of the panel 10 may be partially changed. That is, as shown in FIG. 4, the
upper edge of the panel 10 (near the right edge of the panel 10 shown in FIG. 4) and the lower
edge of the panel 10 (near the left edge of the panel 10 shown in FIG. 4) The thickness of the
panel holding portion 65 in the normal direction of the panel 10 may be different. In FIG. 4, the
panel holding portion holds the panel 10 other than the position near the position where the
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piezoelectric element 30 is installed than the thickness d1 of the panel holding portion 65 which
holds the panel 10 near the position where the piezoelectric element 30 is installed The
thickness d2 of 65 is larger.
[0055]
Thus, in the present modification, the panel holding unit holds the panel 10 other than the
vicinity of the position where the piezoelectric element 30 is installed than the panel holding
portion 65 that holds the panel 10 near the position where the piezoelectric element 30 is
installed. The portion 65 is made thicker in the normal direction of the panel 10. As an example
of such a configuration, as shown in FIG. 4, the thickness of the panel holding portion 65 in the
normal direction of the panel 10 is a panel holding portion that holds the panel 10 near the
position where the piezoelectric element 30 is installed. It can be made to become gradually
thicker as it goes away from 65. In FIG. 4, the thickness d1 of the panel holding portion 65 for
holding the panel 10 near the position where the piezoelectric element 30 is installed is in the
vicinity of the lower edge of the panel 10 (near the left end of the panel 10 shown in FIG. 4) It
smoothly increases toward the thickness d2 of the panel holding portion 65 to be held.
[0056]
In the present modification, the thickness of the panel holding portion 65 in the normal direction
of the panel 10 may not be smoothly increased as shown in FIG. 4 but may be gradually
increased stepwise.
[0057]
In addition, as another modification of the present embodiment, for example, as shown in FIG. 5,
the thickness of the panel holding portion 65 in the normal direction of the panel 10 may be
changed at a predetermined position.
In FIG. 5, although the thickness of the panel holding portion 65 for holding the panel 10 in the
vicinity of the position where the piezoelectric element 30 is installed is d1, the panel is slightly
away from the position where the piezoelectric element 30 is installed The thickness of the panel
holding portion holding 10 is changed to d2. Thus, the thickness of the panel holding portion 65
in the normal direction of the panel 10 changes at a position separated by a predetermined
distance from the panel holding portion 65 holding the panel 10 in the vicinity of the position
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where the piezoelectric element 30 is installed. You may
[0058]
As a result, at the lowermost portion of the housing far enough from the vicinity of the position
where the piezoelectric element 30 is installed, the panel holding portion 65 holds the
piezoelectric element 30 so that the piezoelectric element 30 vibrates. Also reduce the vibration.
That is, in the panel 10, it can reduce that the area which vibrates strongly becomes too wide.
Therefore, in the electronic device 1 according to the present modification, when the
piezoelectric element 30 vibrates the panel 10, sound leakage from the lowermost portion of the
housing far enough from the vicinity of the position where the piezoelectric element 30 is
installed is reduced. be able to. Further, in the electronic device 1 according to the present
modification, for example, when a microphone for collecting the voice of the user is disposed in
the vicinity of the input unit 40 or the like, it is possible to reduce the echo due to the sound
leakage.
[0059]
On the other hand, since the panel 10 in the vicinity of the position where the piezoelectric
element 30 is installed is held by the relatively thin panel holding portion 65, the panel holding
portion 65 suppresses the vibration when the piezoelectric element 30 vibrates. The proportion
is small. For this reason, in the electronic device 1 according to the present modification, the
piezoelectric element 30 vibrates the panel 10 in the vicinity of the position where the
piezoelectric element 30 is installed, thereby causing air conduction noise and vibration noise
transmitted through the human body. Can be generated well.
[0060]
REFERENCE SIGNS LIST 1 electronic device 10 panel 15 touch sensor 20 display unit 30
piezoelectric element 40 input unit (key) 50 substrate 60 case 65 panel holding unit 70 bonding
member
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