JP2014216903

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DESCRIPTION JP2014216903
Abstract: The present invention provides an electronic device of the type that vibrates a member
to which a piezoelectric element is attached by means of the piezoelectric element to generate
vibration sound, and operates well. An electronic device 1 according to the present invention
includes a piezoelectric element 30 and a panel 10 to which the piezoelectric element is attached,
and the panel 10 is deformed due to the deformation of the piezoelectric element 30, and the
panel is deformed A contact portion of a human body in contact with 10 is an electronic device
that vibrates to transmit a sound, and a recess 10a is formed in the panel 10, and the
piezoelectric element 30 is attached to the recess 10a. [Selected figure] Figure 3
Electronic Apparatus The present invention vibrates a member to which the piezoelectric element
is attached by applying a predetermined electric signal (sound signal) to the piezoelectric
element, and transmits the vibration of the member to the human body to transmit a part of the
human body. The present invention relates to an electronic device that transmits vibration noise
transmitted to the user.
[0001]
Patent Document 1 describes an electronic device such as a mobile phone that transmits airconduction sound and bone-conduction sound to a user. Further, in Patent Document 1, air
conduction sound is a sound transmitted to the eardrum by the vibration of the air caused by the
vibration of the object through the ear canal and vibrating the eardrum. Have been described.
Further, Patent Document 1 describes that the 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) that contacts the vibrating object. There is.
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[0002]
In the telephone set described in Patent Document 1, it is described that a short plate-shaped
vibrator made of a piezoelectric bimorph and a flexible material is attached to the outer surface
of a housing through an elastic member. In addition, according to Patent Document 1, when a
voltage is applied to the piezoelectric bimorph of the vibrator, the vibrator bends and vibrates as
the piezoelectric material stretches and contracts in the longitudinal direction, and the user
brings the vibrator into contact with the pinna It is described that air conduction noise and
vibration noise are transmitted to the user.
[0003]
JP 2005-348193 A
[0004]
An object of the present invention is to provide an electronic device of a type in which vibration
noise is generated by vibrating a member to which a piezoelectric element is attached by the
piezoelectric element, and the electronic device operates well.
[0005]
In the electronic device according to the present invention, the piezoelectric element, the member
to which the piezoelectric element is attached, the member is deformed due to the deformation of
the piezoelectric element, and the contact portion of the human body in contact with the member
to be deformed vibrates An electronic device that transmits sound, wherein a recess is formed in
the member, and the piezoelectric element is attached to the recess of the member.
[0006]
According to the present invention, it is possible to provide an electronic device of a type in
which a member to which a piezoelectric element is attached is vibrated by the piezoelectric
element to generate vibration sound and which operates well.
[0007]
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It is a figure which shows the functional block of the electronic device which concerns on one
Embodiment of this invention.
It is a figure which shows the suitable shape of a panel.
It is a figure which shows the mounting structure of the electronic device which concerns on 1st
Embodiment.
It is a figure which shows an example of a vibration of the panel of the electronic device which
concerns on 1st Embodiment.
It is a figure which shows the mounting structure of the electronic device which concerns on the
modification of 1st Embodiment. It is a figure which shows the mounting structure of the
electronic device which concerns on 2nd Embodiment. It is a figure which shows an example of a
vibration of the panel of the electronic device which concerns on 2nd Embodiment. It is a figure
which shows the example of joining of a panel and a housing ¦ casing.
[0008]
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.
[0009]
The panel 10 is a touch panel that detects a touch, a cover panel that protects the display unit
20, or the like. The panel 10 is formed of, for example, glass or a synthetic resin such as acrylic.
The shape of the panel 10 may be plate-like. The panel 10 may be a flat plate, or may be a
curved panel with a smooth surface. When the panel 10 is a touch panel, the panel 10 detects a
touch of a user's finger, a pen, a stylus pen, or the like. As a detection method of the touch panel,
any method such as a capacitance method, a resistance film method, a surface acoustic wave
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method (or an ultrasonic method), an infrared method, an electromagnetic induction method, and
a load detection method can be used. The panel 10 is an example of a member (attachment
member) to which the piezoelectric element is attached.
[0010]
The display unit 20 is a display device such as a liquid crystal display, an organic EL display, or
an inorganic EL display. The display unit 20 is provided on the back of the panel 10. The display
unit 20 is disposed on the back of the panel 10 by a bonding member (for example, an adhesive).
The display unit 20 may be bonded to the panel 10 by a bonding member (for example, an
adhesive), or may be disposed apart from the panel 10 and supported by the housing of the
electronic device 1.
[0011]
The piezoelectric element 30 is an element that expands and contracts or bends according to the
electromechanical coupling coefficient of the constituent material by applying an electric signal
(voltage). As these elements, for example, those made of ceramic or quartz are used. The
piezoelectric element 30 may be a unimorph, bimorph or stacked piezoelectric element. The
laminated piezoelectric element includes a laminated unimorph element in which unimorphs are
laminated (for example, 16 layers or 24 layers), or a laminated bimorph element in which
bimorphs are laminated (for example, 16 layers or 24 layers). The laminated piezoelectric
element is formed of a laminated structure of, for example, a plurality of dielectric layers made of
PZT (lead zirconate titanate) and an electrode layer disposed between the plurality of dielectric
layers. Unimorphs expand and contract when an electric signal (voltage) is applied, and bimorph
bends when an electric signal (voltage) is applied.
[0012]
The piezoelectric element 30 is disposed on the back surface of the panel 10 (the surface on the
inner side of the electronic device 1). The piezoelectric element 30 is attached to the panel 10 by
a bonding member (for example, double-sided tape). The piezoelectric element 30 may be
attached to the panel 10 via an intermediate member (for example, a sheet metal). The
piezoelectric element 30 is spaced apart from the surface on the inner side of the housing 60 by
a predetermined distance in a state of being disposed on the back surface of the panel 10. It is
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preferable that the piezoelectric element 30 be separated from the surface on the inner side of
the housing 60 by a predetermined distance even in a state of expansion and contraction or
bending. That is, the distance between the piezoelectric element 30 and the surface on the inner
side of the housing 60 may be larger than the maximum amount of deformation of the
piezoelectric element 30.
[0013]
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.
[0014]
The control unit 50 is a processor that controls the electronic device 1. The control unit 50
applies a predetermined electric signal (a voltage corresponding to the audio signal) to the
piezoelectric element 30. The voltage applied to the piezoelectric element 30 by the control unit
50 is, for example, ± 15 V, which is higher than ± 5 V that is an applied voltage of a so-called
panel speaker aiming to conduct sound by air conduction sound instead of human body vibration
sound. May be there. As a result, even if the user presses the panel 10 against his / her body with
a force of, for example, 3N or more (5N to 10N), the panel 10 generates sufficient vibration to
cause one of the user's body Human body vibration noise can be generated through the unit. The
level of applied voltage can be appropriately adjusted according to the fixed strength of the panel
10 to the housing or the support member or the performance of the piezoelectric element 30.
When the control unit 50 applies an electrical signal to the piezoelectric element 30, the
piezoelectric element 30 stretches or bends in the longitudinal direction. At this time, the panel
10 to which the piezoelectric element 30 is attached is deformed according to the expansion or
contraction or bending of the piezoelectric element 30, and the panel 10 vibrates. The panel 10
is curved by the expansion or contraction or bending of the piezoelectric element 30. The panel
10 is bent directly by the piezoelectric element 30. The panel 10 is directly bent by the
piezoelectric element means that the panel is specified by the inertia force of the piezoelectric
actuator configured by arranging the piezoelectric element in the casing as employed in a
conventional panel speaker. This is different from the phenomenon in which the area of the
panel is vibrated to deform the panel. The panel 10 is bent directly by the piezoelectric
element means that expansion or contraction (flexure) of the piezoelectric element directly
connects the panel via the joining member or via the joining member and a reinforcing member
80 described later. It means to bend. Therefore, the panel 10 generates an air conduction sound
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and also generates a human body vibration sound through the body part when the user contacts
the body part (for example, the cartilage of the outer ear). For example, the control unit 50 can
cause the piezoelectric element 30 to apply an electrical signal corresponding to an audio signal
related to the voice of the other party, and generate an air conduction sound and a human body
vibration noise corresponding to the audio signal. The audio signal may be related to a ring tone,
music including music, and the like. Note that the audio signal relating to the electrical signal
may be based on music data stored in the internal memory of the electronic device 1, or music
data stored in an external server or the like is reproduced via the network. May be
[0015]
The panel 10 vibrates not only in the mounting area where the piezoelectric element 30 is
mounted, but also in the area away from the mounting area. The panel 10 has a plurality of
points vibrating in a direction intersecting the main surface of the panel 10 in the vibrating area,
and the value of the vibration amplitude changes from positive to negative with time in each of
the plurality of points. Or it changes in the opposite way. At a certain moment, panel 10 vibrates
such that a portion where the amplitude of the vibration is relatively large and a portion where
the amplitude of the vibration is relatively small are randomly distributed substantially
throughout the panel 10. That is, vibration of a plurality of waves is detected over the entire area
of the panel 10. Even if the user presses the panel 10 against his / her body with a force of, for
example, 5N to 10N, the controller 50 controls the piezoelectric element 30 so that the abovedescribed vibration of the panel 10 does not attenuate. The applied voltage may be ± 15V.
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.
[0016]
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
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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.
[0017]
The electronic device 1 described above can transmit the air conduction sound and the human
body vibration sound through a part of the user's body (for example, the cartilage of the outer
ear) to the user by the vibration of the panel 10. Therefore, when outputting a sound having a
volume equivalent to that of a conventional dynamic receiver, the sound transmitted to the
surroundings of the electronic device 1 due to the vibration of air due to the vibration of the
panel 10 is smaller than that of the dynamic receiver. Therefore, it is suitable, for example, when
listening to a recorded message on a train or the like.
[0018]
In addition, since the electronic device 1 described above transmits the human body vibration
sound by the vibration of the panel 10, for example, even if the user wears earphones or
headphones, the user contacts the earphones by bringing the electronic device 1 into contact
with them. Or you can hear the sound through headphones and body parts.
[0019]
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®.
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[0020]
First Embodiment FIG. 3 is a view showing a mounting structure of an electronic device 1
according to a first embodiment. Fig.3 (a) is a front view, FIG.3 (b) is sectional drawing along the
bb line in FIG. 3 (a). FIG.3 (c) is a figure which expands and shows the electronic device 1 upper
part in FIG.3 (b). However, it should be noted that in FIG. 3C, the orientation of FIG. 3B is
different from that of FIG.
[0021]
The electronic device 1 illustrated in FIG. 3 is a smartphone in which a touch panel, which is a
glass plate, is disposed on the front surface of a housing 60 (for example, a metal or resin case)
as the panel 10. The panel 10 and the input unit 40 are supported by the housing 60, and the
display unit 20 and the piezoelectric element 30 are bonded to the panel 10 by the bonding
members 70, respectively. The bonding member 70 is an adhesive having thermosetting or
ultraviolet curing properties, a double-sided adhesive tape, or the like, and may be, for example,
an optical elastic resin which is a colorless and transparent acrylic ultraviolet curing adhesive.
The panel 10, the display unit 20, and the piezoelectric element 30 each have a substantially
rectangular shape.
[0022]
The attachment structure of the piezoelectric element 30 to the panel 10 in the electronic device
1 will be described with reference to FIG. As shown in FIG. 3C, the panel 10 is provided with a
recess 10a. The panel 10 is disposed in the housing 60 in a state where the surface in which the
recess 10 a is formed faces the inside of the electronic device 1. The bottom surface of the
surface constituting the recess 10 a is substantially parallel to the outer surface of the panel 10.
The side surface of the recess 10a is substantially perpendicular to the outer surface. The depth
of the recess 10 a is approximately half of the thickness of the panel 10. That is, in the panel 10,
the thickness of the region where the recess 10a is formed is approximately half the thickness of
the other regions. The recess 10a can be formed by, for example, abrading the surface of the
panel 10 with a wheel cutter using a diamond. The recess 10a can also be formed by, for
example, picosecond pulse laser processing. When the panel 10 is a touch panel, the recess 10 a
is formed in an area where an electrode for detecting contact is not disposed.
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[0023]
The piezoelectric element 30 is disposed in the recess 10 a formed in the panel 10. The
piezoelectric element 30 is bonded to the bottom surface of the recess 10 a through the abovedescribed bonding member 70.
[0024]
The display unit 20 is disposed substantially at the center of the panel 10 in the lateral direction.
The piezoelectric element 30 is disposed at a predetermined distance from an end in the
longitudinal direction of the panel 10, and in the vicinity of the end such that the longitudinal
direction of the piezoelectric element 30 is along the short side of the panel 10. The display unit
20 and the piezoelectric element 30 are arranged side by side in a direction parallel to the
surface on the inner side of the panel 10.
[0025]
FIG. 4 is a view showing an example of the vibration of the panel 10 of the electronic device 1
according to the first embodiment. In the electronic device 1 according to the first embodiment,
the display unit 20 is attached to the panel 10. Therefore, the lower portion of the panel 10 is
less likely to vibrate than the upper portion of the panel 10 to which the piezoelectric element 30
is attached. Therefore, in the lower part of the panel 10, sound leakage due to the vibration of
the lower part of the panel 10 can be reduced. The upper part of the panel 10 is bent directly by
the piezoelectric element 30, and the vibration is damped in the lower part relative to the upper
part. The panel 10 is bent by the piezoelectric element 30 so that the area immediately above the
piezoelectric element 30 is raised most in the long side direction of the piezoelectric element 30
as compared with its surroundings.
[0026]
As described above, according to the electronic device 1 according to the present embodiment,
the panel 10 is deformed due to the deformation of the piezoelectric element 30 attached to the
back surface of the panel 10, and the object contacts the deformed panel 10. In response, air
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conduction sound and human body vibration sound are transmitted. Thus, the air conduction
sound and the human body vibration sound can be transmitted to the user without causing the
vibration body to protrude to the outer surface of the housing 60. Therefore, a patent for
bringing a very small vibration body into contact with the human body as compared to the
housing. The ease of use is improved over the electronic device described in Document 1.
Further, since it is not necessary to put the user's ear on the piezoelectric element itself, the
piezoelectric element 30 itself is unlikely to be damaged. In the case where the case 60 is
deformed instead of the panel 10, the user is likely to drop the terminal when generating the
vibration, but when the panel 10 is vibrated, such a case is caused. It is hard to happen.
[0027]
The piezoelectric element 30 is bonded to the panel 10 by a bonding member 70. Thus, the
piezoelectric element 30 can be attached to the panel 10 in a state in which the freedom of
deformation of the piezoelectric element 30 is not easily inhibited. Further, the bonding member
70 can be made of a non-heat curable adhesive. This has the advantage that thermal stress
contraction is less likely to occur between the piezoelectric element 30 and the panel 10 during
curing. Further, the bonding member 70 can be a double-sided tape. As a result, there is an
advantage that the contraction stress as in use of the adhesive is unlikely to be applied between
the piezoelectric element 30 and the panel 10.
[0028]
Further, the piezoelectric element 30 is disposed in the recess 10 a formed in the panel 10. As
described above, the area in the panel 10 where the recess 10 a is formed has a smaller
thickness than the other areas. Since the piezoelectric element 30 is disposed in the portion
where the thickness is relatively thin in the panel 10, in the panel 10, the area where the recess
10a is formed is due to the deformation of the piezoelectric element 30 compared to the other
areas. The degree of bending directly is large. Therefore, according to the electronic device 1
according to the present embodiment, the user is compared with the case where the recess 10a is
not formed in the panel 10 and the piezoelectric element 30 is attached to the panel 10 and the
panel 10 is bent directly. When a part (for example, an ear) of the human body is brought into
contact with the mounting area of the piezoelectric element 30 in the panel 10, the bending
deformation of the panel 10 is efficiently transmitted to the user.
[0029]
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Further, in the panel 10, the region in which the recess 10a is formed has lower rigidity than the
other regions. In other words, the area of the panel 10 where the piezoelectric element 30 is not
mounted is higher in rigidity than the area where the piezoelectric element 30 is mounted.
Therefore, the lower portion of the panel 10 is less likely to vibrate than the upper portion of the
panel 10 to which the piezoelectric element 30 is attached. Therefore, in the lower part of the
panel 10, sound leakage due to the vibration of the lower part of the panel 10 can be reduced.
[0030]
Further, since the piezoelectric element 30 is disposed in the recess 10a formed in the panel 10,
external force is applied to the electronic device 1 by dropping the electronic device 1, for
example, as compared with the case where the recess 10a is not formed in the panel 10. When
the electronic device 1 is added, electronic components and the like disposed inside the
electronic device 1 are less likely to be in contact with the piezoelectric element 30. That is, the
piezoelectric element 30 is not easily damaged.
[0031]
Modification of First Embodiment Next, a modification of the first embodiment will be described
with reference to FIG. FIG. 5A is a view showing a mounting structure according to a first
modification. FIG. 5B is a view showing a mounting structure according to a second modification.
FIG. 5C is a view showing a piezoelectric element according to a third modification. FIG. 5D is a
view showing a mounting structure according to a third modification. FIG. 5E is a view showing a
mounting structure according to the fourth modification. 5 (a), 5 (b), 5 (d) and 5 (e) are views
seen from the same direction as FIG. 3 (c). Hereinafter, the description of the same configuration
as that of the first embodiment described above will be omitted, and mainly different portions
will be described.
[0032]
The first modification shown in FIG. 5 (a) is different from FIG. 3 (c) in the shape of the recess
10a. That is, the recess 10a has a shape in which the edge is gently inclined. The recess 10a has
an R-shaped edge. Due to the configuration in which the edge of the recess 10a is gently inclined,
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the corners of the recess 10a are arranged when the piezoelectric element 30 is disposed in the
recess 10a as compared with the structure in which the edge is perpendicular as shown in FIG.
The piezoelectric element 30 is less likely to be damaged.
[0033]
Further, in FIG. 5A, the main surface (surface on the inner side of the electronic device 1) of the
side not to be attached to the panel 10 of the piezoelectric element 30 is substantially flush with
the main surface on the inner side of the electronic device of the panel 10. It has become. That is,
the piezoelectric element 30 disposed in the recess 10 a does not protrude to the inside of the
electronic device 1 as compared to the main surface of the panel on the inside of the electronic
device. The main surface (surface on the inner side of the electronic device 1) of the side not to
be attached to the panel 10 of the piezoelectric element 30 is positioned outside the electronic
device 1 with respect to the surface of the panel 10 on the inner side of the electronic device It is
also good. Thereby, for example, when an external force is applied to the electronic device 1 by
dropping the electronic device 1 or the like, the piezoelectric element 30 is less likely to be
damaged.
[0034]
In the second modification shown in FIG. 5B, the cross-sectional shape of the recess 10a is a
curved surface. The curved surface includes, for example, a semicircular arc shape, a
semielliptical arc shape, and a parabolic shape. And in FIG.5 (b), the joining member 70 is an
elastic adhesive. The elastic adhesive is, for example, a silicone-based adhesive, a modified
silicone-based adhesive, and a synthetic rubber-based adhesive. When bonding a flat plate-like
piezoelectric element 30 to a concave portion 10a having a curved surface in cross section, when
a double-sided tape is used as the bonding member 70, both are not sufficiently bonded due to
the difference in the shape of the bonding surface of the two. there is a possibility. Further, for
example, in the case where both are adhered with an epoxy resin-based adhesive, although the
adhesiveness can be secured, the adhesive cures, and thus the deformation of the piezoelectric
element 30 may not be transmitted to the panel 10 sufficiently. The elastic adhesive is rich in
elasticity after curing as compared to an epoxy adhesive, so that it is possible to transfer the
deformation of the piezoelectric element 30 to the panel 10 after curing while bonding the two.
[0035]
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A third modification will be described with reference to FIGS. 5 (c) and 5 (d). FIG. 5C is a
perspective view of a piezoelectric element 30 according to a third modification. The
piezoelectric element has a first major surface 30a and a second major surface 30b. The first
major surface 30a has a shape in which a central portion protrudes more than both end portions
in a direction perpendicular to the second major surface 30b (the upper direction in the
drawing). The state in which the central portion protrudes more than both end portions does not
have to occur over the entire length direction (the depth direction in the drawing). In the first
main surface 30a, the amount of protrusion from both ends of the central portion in the direction
perpendicular to the second main surface 30b is set to, for example, about 7% to 30% of the
thickness of the piezoelectric element 30. For example, when the piezoelectric element 30 is a
rectangular solid having a length of 23.5 mm, a width of 3.3 mm, and a thickness of 0.5 mm
excluding the protruding portion, the amount of projection is about 0.05 mm. As described
above, when using the piezoelectric element 30 having a flat plate shape but having a structure
in which the main surface on one side protrudes, as shown in FIG. 5D, even if the cross-sectional
shape of the recess 10a is a curved surface Since the shapes of the bonding surfaces of both the
piezoelectric element 30 and the panel 10 are similar, even when a double-sided tape is used as
the bonding member 70, both can be sufficiently bonded.
[0036]
In the fourth modified example shown in FIG. 5E, the piezoelectric element 30 is attached to the
side surface of the recess 10 a via the bonding member 70. The panel 10 is flat and has a main
surface exposed to the outside of the electronic device 1 and a main surface exposed to the
inside. And the recessed part 10a shown in FIG.5 (e) is substantially perpendicular ¦ vertical with
respect to the main surface. The piezoelectric element 30 is attached to a surface substantially
perpendicular to the main surface of the panel 10. Thereby, thickness reduction of the electronic
device 1 can be achieved.
[0037]
Second Embodiment FIG. 6 is a view showing a mounting structure of an electronic device 1
according to a second embodiment. 6 (a) is a front view, FIG. 6 (b) is a cross-sectional view taken
along the line b-b in FIG. 6 (a), and FIG. 6 (c) is taken along the line c-c in FIG. 6 (a) FIG. The
electronic device 1 shown in FIG. 6 is a foldable mobile phone in which a cover panel (acrylic
plate) for protecting the display unit 20 as the panel 10 is disposed on the front of the upper
case 60. In the second embodiment, a reinforcing member 80 is disposed between the panel 10
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and the piezoelectric element 30. The reinforcing member 80 is a plate made of resin, for
example, a plate made of resin, or a plate made of resin or glass fiber. That is, the electronic
device 1 according to the second embodiment has a structure in which the piezoelectric element
30 and the reinforcing member 80 are bonded by the bonding member 70, and the reinforcing
member 80 and the panel 10 are bonded by the bonding member 70. Further, in the second
embodiment, the display unit 20 is supported not by the panel 10 but by the housing 60. That is,
in the electronic device 1 according to the second embodiment, the display unit 20 is separated
from the panel 10, and the display unit 20 and the support unit 90 which is a part of the housing
60 are bonded by the bonding member 70. It is a structure. In addition, the support part 90 is
not limited to the structure as a part of housing ¦ casing 60, It is possible to comprise as a
member independent of the housing ¦ casing 60 by metal, resin, etc. FIG.
[0038]
Also in the second embodiment, as in the first embodiment, a configuration in which the
piezoelectric element 30 and the reinforcing member 80 are disposed in the recess 10 a formed
in the panel 10 can be adopted. Further, the structure according to the modification shown in
FIG. 5 can also be adopted as appropriate.
[0039]
FIG. 7 is a view showing an example of the vibration of the panel 10 of the electronic device 1
according to the second embodiment. In the electronic device 1 according to the second
embodiment, the panel 10 is an acrylic plate having a rigidity lower than that of the glass plate,
and the display unit 20 is not adhered to the back surface of the panel 10. The amplitude
generated by the piezoelectric element 30 is larger than that of the electronic device 1 according
to the first embodiment. Moreover, the panel 10 vibrates not only in the attachment area where
the piezoelectric element 30 is attached but also in an area away from the attachment area.
Therefore, in addition to airborne sound through the air, the user can touch the ear to an
arbitrary position of the panel 10 to hear human body vibration sound.
[0040]
Thus, according to the electronic device 1 according to the present embodiment, the reinforcing
member 80 and the panel 10 are deformed due to the deformation of the piezoelectric element
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30 attached to the panel 10 via the reinforcing member 80, and the deformation is performed.
The air conduction sound and the human body vibration sound are transmitted to the object
contacting the panel 10. Thereby, the air conduction sound and the human body vibration sound
can be transmitted to the user without putting the vibrating body itself on the ear. Also, the
piezoelectric element 30 is attached to the surface of the panel 10 on the inner side of the
housing 60. Therefore, the air conduction sound and the human body vibration sound can be
transmitted to the user without causing the vibrating body to protrude from the outer surface of
the housing 60. Further, not only in the mounting area where the piezoelectric element 30 is
attached, but also in any part of the panel 10, deformation occurs in the panel 10 to transmit the
air conduction sound and the human body vibration sound. Therefore, in addition to airborne
sound through the air, the user can touch the ear to an arbitrary position of the panel 10 to hear
human body vibration sound.
[0041]
Further, by arranging the reinforcing member 80 between the piezoelectric element 30 and the
panel 10, for example, when an external force is applied to the panel 10, the external force may
be transmitted to the piezoelectric element 30 and the piezoelectric element 30 may be damaged.
It can be reduced. Further, even if the panel 10 is in strong contact with the human body, the
vibration of the panel 10 can be hardly damped. Further, by arranging the reinforcing member
80 between the piezoelectric element 30 and the panel 10, the resonance frequency of the panel
10 is lowered, and the acoustic characteristics in the low frequency band are improved. In place
of the reinforcing member 80, a plate-like weight may be attached to the piezoelectric element
30 by the joining member 70.
[0042]
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.
[0043]
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For example, as shown in FIG. 8, the panel 10 may be joined to the housing 60 by the joining
member 70. As described above, by making it difficult for the vibration from the panel 10 to be
transmitted directly to the housing 60, the risk of the user dropping the electronic device 1 can
be reduced as compared with the case where the housing itself vibrates largely. Further, the
bonding member 70 can be made of a non-heat curable adhesive. This has the advantage that
thermal stress shrinkage is less likely to occur between the housing 60 and the panel 10 during
curing. Further, the bonding member 70 can be a double-sided tape. As a result, there is an
advantage that contraction stress as in the use of an adhesive is less likely to occur between the
housing 60 and the panel 10.
[0044]
For example, when the panel 10 and the display unit 20 do not overlap, the piezoelectric element
30 may be disposed at the center of the panel 10. When the piezoelectric element 30 is disposed
at the center of the panel 10, the vibration of the piezoelectric element 30 is uniformly
transmitted to the entire panel 10 to improve the quality of the air conduction sound, or the user
can listen to various positions of the panel 10 Even if it makes contact with the human body, the
human body vibration noise can be recognized. As in the above-described embodiment, a
plurality of piezoelectric elements 30 may be mounted.
[0045]
Moreover, in the above-described electronic device 1, the piezoelectric element 30 is attached to
the panel 10, but may be attached to a place different from the panel 10. For example, the
piezoelectric element 30 may be attached to the battery lid attached to the housing 60 and
covering the battery. Since the battery lid is often attached to a surface different from the panel
10 in the electronic device 1 such as a portable telephone, according to such a configuration, the
user can use a part of the body (for example, an ear) on the surface different from the panel 10
You can hear it by touching it.
[0046]
In addition, the panel 10 can constitute any or all of a display panel, an operation panel, a cover
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panel, and a lid panel for making a rechargeable battery removable. In particular, when the panel
10 is a display panel, the piezoelectric element 30 is disposed outside the display area for the
display function. This has the advantage of being less likely to interfere with the display. The
operation panel includes the touch panel of the first embodiment. Further, the operation panel
includes, for example, a sheet key which is a member which is integrally formed on a key top of
operation keys in a foldable type portable telephone and which constitutes one surface of an
operation unit side housing.
[0047]
The recess 10 a may be formed on the surface of the panel 10 on the outer side of the electronic
device 1, and the piezoelectric element 30 may be disposed in the recess 10 a. Further, the
member (attachment member) to which the piezoelectric element is attached is not limited to the
panel 10, and may be, for example, the housing 60. The attachment member is, for example, an
acrylic panel that constitutes the external appearance of the electronic device 1 and may be an
acrylic panel for exposing the light receiving surface of the camera module or the infrared
module. The attachment member may be, for example, a connector cap that covers a connector
such as micro USB.
[0048]
In the first and second embodiments, the joint member 70 for bonding the panel 10 and the
piezoelectric element 30 and the joint member for bonding the panel 10 and the housing 60
have the same reference numerals. As described. However, as the joining members used in the
first embodiment and the second embodiment, different ones may be used as appropriate
depending on the members to be joined.
[0049]
DESCRIPTION OF SYMBOLS 1 electronic device 10 panel 10a recessed part 20 display part 30
piezoelectric element 40 input part 50 control part 60 housing ¦ casing 70 joining member 80
reinforcement member 90 support part
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