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JP2015126283

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2015126283
The present invention provides a sapphire panel excellent in vibration characteristics and a
portable terminal using the same. A portable terminal includes a case portion having an
electronic component inside, a sapphire panel attached to the case portion and having a
thickness of 0.5 mm or less, and a vibration element for vibrating the sapphire panel. Have. In
addition, the portable terminal is a portable terminal having a call function, and the user can
check the sound from the calling party by contacting the sapphire panel with his ear when
calling with the other party. Vibrate. [Selected figure] Figure 3
Sapphire panel and portable terminal using the same
[0001]
The present invention relates to a sapphire panel excellent in vibration characteristics and a
portable terminal using the same.
[0002]
Conventionally, various techniques have been proposed for portable terminals.
For example, Patent Document 1 describes a technology for transmitting a sound to a user of a
telephone by attaching a vibration element to a cover panel of a telephone such as a mobile
telephone or a fixed telephone and vibrating the piezoelectric vibration element. It is done.
10-05-2019
1
[0003]
Unexamined-Japanese-Patent No. 2013-131987
[0004]
Although a glass panel is usually used as a cover panel to which a vibration element is attached, a
portable terminal using a cover panel made of a crystalline material has been developed in recent
years, and along with that, it is configured from a single crystal material There is an increasing
demand for attaching vibration elements to cover panels.
[0005]
However, a cover panel made of a single crystal material has inferior vibration characteristics as
compared to a glass panel due to its hardness.
[0006]
The present invention has been made in view of such circumstances, and an object thereof is to
provide a single crystal panel excellent in vibration characteristics and a portable terminal using
the same.
[0007]
A portable terminal according to an embodiment of the present invention includes: a case portion
having an electronic component therein; a sapphire panel attached to the case portion and
having a thickness of 0.5 mm or less; and vibration for vibrating the sapphire panel And an
element.
[0008]
The sapphire panel according to the embodiment of the present invention has a thickness of 0.5
mm or less, is attached to the case portion of the portable terminal, and can be vibrated by the
vibration element of the portable terminal.
[0009]
As described above, by using a specific thickness, it is possible to provide a sapphire panel
excellent in vibration characteristics and a portable terminal using the same.
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2
[0010]
It is a front view which shows the external appearance of a portable terminal.
It is a reverse view which shows the external appearance of a portable terminal.
It is a perspective view which shows the cover panel 2 of a portable terminal.
It is a figure which shows the cross-sectional structure when the A-A 'line | wire of the portable
terminal of FIG. 1 cut | disconnects.
It is a figure which shows the electric constitution of a portable terminal.
It is a top view which shows the structure of a piezoelectric vibration element.
It is a side view which shows the structure of a piezoelectric vibration element.
It is a figure which shows a mode that a piezoelectric vibration element carries out bending
vibration. It is a figure which shows a mode that a piezoelectric vibration element carries out
bending vibration. It is a top view at the time of seeing a cover panel from the inner side
principal surface side. It is a figure for demonstrating air conduction sound and conduction
sound.
[0011]
<Appearance of Mobile Terminal> A mobile phone of a smartphone type is shown as the mobile
terminal 1 according to the present embodiment, but the mobile terminal of the present
invention is not limited to this.
[0012]
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3
As shown in FIGS. 1 and 2, the portable terminal 1 includes a cover panel 2, a front side case 3
supporting the cover panel 2, and a back side case 4 attached to the front side case 3. .
In the present embodiment, the front side case portion 3 and the rear side case portion 4
constitute a case portion of the portable terminal 1. The shape of the portable terminal 1 is a
substantially rectangular plate in plan view. In the present invention, the surface forming the
case portion may be a flat surface, or may be a curved surface. When the case portion has a
curved surface, the shape of the side surface and the back surface of the portable terminal
becomes a curved surface, which can be shaped to fit the user's hand.
[0013]
As shown in FIG. 1, the cover panel 2 constitutes a portion of the front surface portion of the
portable terminal 1 other than the peripheral end portion (peripheral portion). In addition, a
"cover panel" means the panel exposed to the exterior among the site | parts of a portable
terminal. Moreover, the "panel" used in the present specification is a plate-like or film-like
component having a flat surface and a curved surface. The front side case portion 3 and the back
side case portion 4 constitute a peripheral end portion, a side surface portion and a back surface
portion of the front surface portion of the portable terminal 1. Each of the front side case portion
3 and the back side case portion 4 is made of, for example, a resin. As a resin which forms front
side case part 3 and back side case part 4, polycarbonate resin, ABS resin, or nylon resin is
adopted, for example. In addition to the resin, for example, a metal such as aluminum may be
employed for each of the front side case portion 3 and the rear side case portion 4. In a space
surrounded by the front side case portion 3 and the back side case portion 4, a printed circuit
board 104 on which various electronic components such as a CPU 101 and a DSP 102 described
later are mounted is provided.
[0014]
The cover panel 2 shown in FIG. 3 has a plate shape and has a substantially rectangular shape in
a plan view.
[0015]
Examples of the cover panel 2 include a sapphire panel and the like.
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4
A sapphire panel means the panel comprised from the single-crystal material which has an
alumina (Al2O3) as a main component. In the present specification, the “main component”
specifically means 50% by mass or more, preferably 70% by mass or more.
[0016]
The material constituting the cover panel 2 is preferably a single crystal having an Al 2 O 3
purity of about 90% or more, from the viewpoints that scratching is less likely to occur and
cracking, chipping, and the like are suppressed more reliably.
[0017]
As a single crystal material employ | adopted as the cover panel 2 other than a sapphire panel, a
diamond, a zirconia, a titania, quartz, lithium tantalate, an aluminum oxynitride, etc. are
mentioned, for example.
These are also preferably single crystals having a purity of about 90% or more, from the
viewpoint of being more resistant to scratching and more reliably suppressing cracking and
chipping.
[0018]
In FIG. 3, the thickness of the cover panel 2 is indicated by a symbol t.
[0019]
In the present invention, as described above, by controlling the thickness t of the cover panel 2
made of a single crystal material, the cover panel 2 can exhibit sufficient vibration
characteristics.
[0020]
In order for the cover panel 2 to exhibit sufficient vibration characteristics, the thickness t is
preferably 0.5 mm or less.
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5
The thickness t of the cover panel 2 is preferably equal to or less than 0.45 mm because
vibration characteristics can be further sufficiently obtained.
[0021]
Further, it is preferable that the main surface of the cover panel 2 be the A surface because the
strength of the cover panel 2 is sufficiently obtained.
Here, the A-plane is one of the plane orientations of the crystal structure of a sapphire single
crystal exhibiting anisotropy. In addition to the A-plane, an R-plane exists as a plane orientation
of the crystal structure of the sapphire single crystal. The main surface of the cover panel 2 is
preferably the A surface rather than the R surface, since the strength and vibration
characteristics of the cover panel 2 can be obtained in a well-balanced manner. On the other
hand, when attention is paid to the vibration characteristics, the R characteristics are more
preferable than the A surfaces, as described in <Example> described later, because the vibration
characteristics can be sufficiently improved.
[0022]
As the cover panel 2, for example, a panel formed by bonding a sapphire panel whose main
surface is an A surface and a sapphire panel whose main surface is an R surface is formed, and a
sapphire panel whose main surface is an A surface is outside And a vibration element may be
attached to the sapphire panel whose main surface is an R surface to give vibration
characteristics and strength.
[0023]
The thickness t of the cover panel 2 is preferably 0.2 mm to 0.5 mm, and more preferably 0.4
mm to 0.45 mm, in order to achieve both the vibration characteristics and the strength of the
cover panel 2 sufficiently. preferable.
[0024]
The cover panel 2 is provided with a transparent display portion (also called a display window)
2a through which the display of the display panel 120 is transmitted.
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The display portion 2a has, for example, a rectangular shape in plan view.
The visible light output from the display panel 120 is extracted to the outside of the portable
terminal 1 through the display portion 2a. The user can visually recognize the information
displayed on the display panel 120 from the outside of the portable terminal 1 through the
display portion 2a.
[0025]
Most of the peripheral edge (peripheral edge) 2 b surrounding the display portion 2 a in the
cover panel 2 is black by, for example, affixing a film or the like. As a result, most of the
peripheral end 2 b is a non-display portion where the display of the display panel 120 does not
transmit.
[0026]
As the cover panel, a panel having a transparent display portion is mentioned as a specific
example in the above-mentioned specific example, but in the present invention, the part of the
portable terminal is exposed to the outside, and it is on the back side etc. A panel that is not
transparent is also included if it is a panel that vibrates with a vibrating element. For example, it
may be installed on the back or side of the portable terminal, and may not be transparent if there
is no display device such as the display panel 120 on the back side of the panel.
[0027]
As shown in FIG. 4, the touch panel 130 and the display panel 120 are provided on the inner
main surface 20 side of the cover panel 2. The display panel refers to a member including a
display function, such as a liquid crystal panel and an organic EL display panel.
[0028]
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The display panel 120 which is the display unit is attached to the main surface of the touch panel
130 opposite to the main surface on the inner main surface 20 side. That is, the display panel
120 is attached to the inner main surface 20 of the cover panel 2 via the touch panel 130. The
display panel 120 is sandwiched between the cover panel 2 and the front case portion 3. In FIG.
4, the display panel 120 is sandwiched by the cover panel 2 and the front case portion 3 but is
not essential in the present invention. For example, the display panel 120 may be sandwiched
between the cover panel 2 and a sheet metal, or may be another member. In the cover panel 2, a
portion facing the display panel 120 is a display portion 2a. The user can give various
instructions to the portable terminal 1 by operating the display portion 2 a of the cover panel 2
with a finger or the like.
[0029]
As shown in FIG. 2, a microphone hole 50 may be formed at the lower end of the rear case
portion 4. Further, as shown in FIG. 2, a speaker hole 80 may be formed on the back surface of
the portable terminal 1, specifically, on the surface of the back side case unit 4.
[0030]
In a case portion including the front side case portion 3 and the back side case portion 4, a
proximity sensor 140, a front side imaging portion 160, a back side imaging portion 170 and a
piezoelectric vibration element 190 as a vibration element, which will be described later It is
provided. As shown in FIG. 4, the piezoelectric vibrating element 190 is attached to the inner
major surface 20 of the cover panel 2 by the attaching unit 250. A proximity sensor 120 is
attached to the back side of the upper end of the cover panel 2 (not shown). Further, on the back
surface 10 of the portable terminal 1, an imaging lens provided in the back surface side imaging
unit 170 in the exterior case unit 5 is provided (not shown), and as shown in FIG. A back lens
transparent portion 90 is provided to transmit external light to the back side imaging unit 170
through the lens.
[0031]
The cover panel 2 is attached to the front case portion 3 with a double-sided tape or an adhesive.
Particularly, from the viewpoint of improvement of vibration characteristics and waterproof
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8
characteristics, the lower end and the side end of the peripheral end 211 of the inner main
surface 20 of the cover panel 2 is an adhesive (first attached portion), and the upper end is the
first It is preferable that the double-sided tape (2nd sticking part) whose adhesive force is weaker
than the sticking part of 2 is employ | adopted. By adopting this configuration, the vicinity of the
upper end of the cover panel 2 near which the piezoelectric vibrating element 190 is provided
can be vibrated more.
[0032]
<Electrical Configuration of Portable Terminal> FIG. 5 is a block diagram mainly showing the
electrical configuration of the portable terminal 1. As shown in FIG. 5, the mobile terminal 1 is
provided with a control unit 100, a wireless communication unit 110, a display panel 120, a
touch panel 130, and a proximity sensor 140. Further, the portable terminal 1 is provided with a
microphone 150, a front side imaging unit 160, a back side imaging unit 170, an external
speaker 180, a piezoelectric vibrating element 190, and a battery 200. These components other
than the cover panel 2 provided in the portable terminal 1 are housed in the exterior case
portion 5.
[0033]
The control unit 100 includes a central processing unit (CPU) 101, a digital signal processor
(DSP) 102, a storage unit 103, and the like. The control unit 100 centrally manages the operation
of the mobile terminal 1 by controlling other components of the mobile terminal 1.
[0034]
The storage unit 103 is configured of a non-temporary recording medium readable by the
control unit 100 (the CPU 101 and the DSP 102), such as a read only memory (ROM) and a
random access memory (RAM). The storage unit 103 includes a main program and a plurality of
control programs for controlling the respective components such as the wireless communication
unit 110 and the display panel 120 of the portable terminal 1 for controlling the portable
terminal 1. Application programs etc. are stored. Various functions of the control unit 100 are
realized by the CPU 101 and the DSP 102 executing various programs in the storage unit 103.
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[0035]
The storage unit 103 may include a non-transitory storage medium readable by a computer,
other than the ROM and the RAM. The storage unit 103 may include, for example, a small hard
disk drive and an SSD (Solid State Drive).
[0036]
The wireless communication unit 110 has an antenna 111. The wireless communication unit 110
receives a signal from a mobile phone different from the mobile terminal 1 or a signal from a
communication apparatus such as a web server connected to the Internet via the base station via
the antenna 111. The wireless communication unit 110 performs amplification processing and
down conversion on the received signal, and outputs the result to the control unit 100. The
control unit 100 performs demodulation processing and the like on the received signal to be
input, and acquires a sound signal (sound information) indicating sound, music, and the like
included in the received signal.
[0037]
Further, the wireless communication unit 110 performs up-conversion and amplification
processing on the transmission signal including the sound signal and the like generated by the
control unit 100, and wirelessly transmits the processed transmission signal from the antenna
111. A transmission signal from the antenna 111 is received through a base station by a portable
telephone different from the portable terminal 1 or a communication device connected to the
Internet.
[0038]
The display panel 120, which is a display unit, is controlled by the control unit 100 to display
various information such as characters, symbols, and figures. The information displayed on the
display panel 120 can be viewed by the user of the portable terminal 1 through the display
portion 2 a of the cover panel 2.
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[0039]
The touch panel 130 is, for example, a projected capacitive type touch panel. The touch panel
130 includes two sheet-like electrode sensors disposed to face each other. The two electrode
sensors are bonded together by a transparent adhesive sheet. On one electrode sensor, a plurality
of elongated X electrodes extending in the X-axis direction (for example, the left-right direction of
the portable terminal 1) and arranged in parallel with each other are formed. The other electrode
sensor is formed with a plurality of elongated Y electrodes which extend in the Y-axis direction
(for example, the vertical direction of the portable terminal 1) and are arranged in parallel with
each other. When the user's finger or the like contacts the display portion 2 a of the cover panel
2, the capacitance between the X electrode and the Y electrode under the contact point changes.
Thereby, the operation (contact) on the display portion 2 a of the cover panel 2 in the touch
panel 130 is detected. The touch panel 130 generates an electrical signal indicating a change in
capacitance between the X electrode and the Y electrode, and outputs the signal to the control
unit 100. The control unit 100 specifies the content of the operation performed on the display
portion 2 a of the cover panel 2 based on the electrical signal, and performs an operation
according to the content.
[0040]
The proximity sensor 140 is, for example, an infrared proximity sensor. The proximity sensor
140 outputs a detection signal when an object approaches the proximity sensor 140 within a
predetermined distance. The detection signal is input to the control unit 100. When the control
unit 100 receives a detection signal from the proximity sensor 140, for example, the control unit
100 stops the operation detection function on the touch panel 130. In addition, although the
detection of contact of objects, such as a user's finger, with respect to the display part 2a of the
cover panel 2 is made to a touch panel as a specific example of this implementation for a user
operation, it is not limited to a touch. For example, an approach of an object such as a user's
finger may be detected using a touch panel with an improved capacitance detection accuracy. In
the specific example of the present embodiment, the touch panel detects a touch of an object
such as a user's finger for detecting a user operation, but the detection for the user operation is
not limited to the touch panel. For example, a proximity sensor may detect the proximity of an
object such as a user's finger for detection of user operation.
[0041]
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11
The front side imaging unit 160 and the back side imaging unit 170 are configured by an
imaging lens, an imaging element, and the like. These capture still images and moving images
based on control by the control unit 100.
[0042]
The microphone 150 converts a sound input from the outside of the portable terminal 1 into an
electric sound signal and outputs the electric sound signal to the control unit 100. Sound from
the outside of the portable terminal 1 is taken into the inside of the portable terminal 1 from the
microphone hole 50 provided on the front surface of the cover panel 2 and input to the
microphone 150. When a sapphire panel is used as the cover panel 2, it is preferable that the
microphone hole 50 be disposed on the side surface or the back surface 10 of the portable
terminal 1 because processing on the sapphire panel is difficult.
[0043]
The external speaker 180 is, for example, a dynamic speaker. The external speaker 180 converts
the electrical sound signal from the control unit 100 into sound and outputs it. The sound output
from the external speaker 180 is output to the outside from the speaker hole 80 provided on the
back surface 10 of the portable terminal 1. The sound output from the speaker hole 80 is loud
enough to be heard even at a place away from the portable terminal 1. Alternatively, the external
speaker may be a film speaker.
[0044]
As shown in FIG. 4, the piezoelectric vibrating element 190 is attached to the inner major surface
20 of the cover panel 2 provided on the front surface of the portable terminal 1 by the attaching
member 250. As the sticking member 250, a double-sided tape or an adhesive is employed. The
piezoelectric vibrating element 190 is vibrated by the drive voltage supplied from the control
unit 100. The control unit 100 generates a drive voltage based on the sound signal, and applies
the drive voltage to the piezoelectric vibration element 190. The piezoelectric vibration element
190 is vibrated by the control unit 100 based on the sound signal, whereby the cover panel 2
vibrates based on the sound signal. As a result, the reception sound is transmitted from the cover
panel 2 to the user. The volume of the reception sound is such that the user can appropriately
hear when the user brings his ear close to the cover panel 2. The reception sound transmitted to
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the user from the cover panel 2 will be described in detail later.
[0045]
The battery 200 outputs the power of the portable terminal 1. The power output from the
battery 200 is supplied to each electronic component included in the control unit 100, the
wireless communication unit 110, and the like included in the portable terminal 1. In addition, as
shown in FIG. 3, as the battery 200, for example, a large one showing most of the volume in the
back side case portion 4 is used, but the battery 200 is not limited to this.
[0046]
<Details of Piezoelectric Vibrating Element> FIGS. 6 and 7 are a top view and a side view showing
the structure of the piezoelectric vibrating element 190, respectively. As shown in FIGS. 8 and 9,
the piezoelectric vibrating element 190 has an elongated shape in one direction. Specifically, the
piezoelectric vibrating element 190 has a rectangular elongated plate shape in a plan view. The
piezoelectric vibrating element 190 has, for example, a bimorph structure. The piezoelectric
vibrating element 190 includes a first piezoelectric ceramic plate 190a and a second
piezoelectric ceramic plate 190b which are bonded to each other via a shim member 190c.
[0047]
In the piezoelectric vibrating element 190, when a positive voltage is applied to the first
piezoelectric ceramic plate 190a and a negative voltage is applied to the second piezoelectric
ceramic plate 190b, the first piezoelectric ceramic plate 190a extends in the longitudinal
direction. As a result, the second piezoelectric ceramic plate 190b shrinks along the longitudinal
direction. As a result, as shown in FIG. 8, the piezoelectric vibrating element 190 is bent in a
mountain shape with the first piezoelectric ceramic plate 190 a being outside.
[0048]
On the other hand, in the piezoelectric vibrating element 190, when a negative voltage is applied
to the first piezoelectric ceramic plate 190a and a positive voltage is applied to the second
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13
piezoelectric ceramic plate 190b, the first piezoelectric ceramic plate 190a is in the longitudinal
direction The second piezoelectric ceramic plate 190b extends along the longitudinal direction.
As a result, as shown in FIG. 9, the piezoelectric vibrating element 190 is bent in a mountain
shape with the second piezoelectric ceramic plate 190b outside.
[0049]
The piezoelectric vibrating element 190 performs flexural vibration along the longitudinal
direction by alternately taking the state of FIG. 8 and the state of FIG. The control unit 100
applies an alternating voltage in which a positive voltage and a negative voltage alternately
appear between the first piezoelectric ceramic plate 190a and the second piezoelectric ceramic
plate 190b, thereby to elongate the piezoelectric vibrating element 190 in the longitudinal
direction. Sway and vibrate along.
[0050]
In the piezoelectric vibrating element 190 shown in FIGS. 6 to 9, only one structure including the
first piezoelectric ceramic plate 190a and the second piezoelectric ceramic plate 190b bonded to
each other with the shim member 190c interposed therebetween is provided. However, multiple
such structures may be stacked. The laminated structure is preferably 28 layers or more, more
preferably 44 layers or more, because sufficient vibration can be transmitted to the cover panel
2.
[0051]
In addition to the piezoelectric ceramic material, the piezoelectric vibration element 190 may be
made of an organic piezoelectric material such as polyvinylidene fluoride or polylactic acid.
Specifically, for example, a polylactic acid film is used as a first piezoelectric plate and a second
piezoelectric plate, and they are laminated. In addition, it is also possible to use transparent
electrodes, such as ITO (Indium-Tin-Oxide, ie, indium tin oxide), as an electrode, for example.
[0052]
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14
The piezoelectric vibrating element 190 having such a structure is disposed at the peripheral end
of the inner major surface 20 of the cover panel 2 as shown in FIG. Specifically, the piezoelectric
vibrating element 190 is disposed at the central portion in the width direction of the cover panel
2 at the upper end of the inner major surface 20 of the cover panel 2. The piezoelectric vibrating
element 190 is disposed such that its longitudinal direction is along the short side direction of
the cover panel 2, and performs flexural vibration along the short side direction of the cover
panel 2. The center of the piezoelectric vibrating element 190 in the longitudinal direction
coincides with the center of the short direction DR <b> 2 at the upper end of the inner main
surface 20 of the cover panel 2.
[0053]
Here, in the piezoelectric vibration element 190 that performs flexural vibration, the
displacement amount is largest at the center in the longitudinal direction. Therefore, when the
center in the longitudinal direction of the piezoelectric vibrating element 190 coincides with the
center in the short direction at the upper end of the inner major surface 20 of the cover panel 2,
the displacement amount of the piezoelectric vibrating element 190 in bending vibration is The
location of the maximum is to coincide with the center in the short direction at the upper end of
the inner major surface 20 of the cover panel 2.
[0054]
Further, the partial region 220 where the front case portion 3 and the display panel 120 are not
attached at the upper end of the cover panel 2 is elongated along the short direction of the cover
panel 2. The piezoelectric vibrating element 190 is disposed in the partial area 220 so that the
longitudinal direction (the direction in which the flexural vibration is performed) is along the
longitudinal direction of the partial area 220, the partial area 220 easily vibrates. Therefore, the
reception sound can be easily transmitted from the cover panel 2 to the user.
[0055]
Regarding Generation of Receiving Sound In the portable terminal 1 according to the present
embodiment, air conduction sound and conducted sound are transmitted to the user from the
cover panel 2 when the piezoelectric vibration element 190 vibrates the cover panel 2 . In other
words, when the vibration of the piezoelectric vibrating element 190 itself is transmitted to the
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cover panel 2, the air conduction sound and the conduction sound are transmitted from the cover
panel 2 to the user.
[0056]
Here, the air conduction sound is a sound that is recognized by the human brain when a sound
wave (air vibration) that has entered the ear canal hole (so-called "ear hole") vibrates the
tympanic membrane. On the other hand, the conduction sound is a sound that is recognized by
the human brain when the auricle is vibrated and the vibration of the auricle is transmitted to the
tympanic membrane to vibrate the tympanic membrane. The air conduction sound and the
conduction sound will be described in detail below.
[0057]
FIG. 11 is a figure for demonstrating air conduction sound and conduction sound. FIG. 11 shows
the structure of the ear of the user of the portable terminal 1. In FIG. 11, a broken line 400
indicates a conduction path of a sound signal (sound information) when airway sound is
recognized by the brain. The solid line 410 shows the conduction path of the sound signal when
the conduction sound is recognized in the brain.
[0058]
When the piezoelectric vibrating element 190 attached to the cover panel 2 is vibrated based on
an electrical sound signal indicating a reception sound, the cover panel 2 vibrates and a sound
wave is output from the cover panel 2. When the user holds the portable terminal 1 and brings
the cover panel 2 of the portable terminal 1 close to the pinnae 300 of the user, or the cover
panel 2 of the portable terminal 1 is in the pinnae 300 of the user. Sound waves emitted from the
cover panel 2 enter the ear canal hole 310. The sound wave from the cover panel 2 travels in the
ear canal 310 and vibrates the tympanic membrane 320. The vibration of the tympanic
membrane 320 is transmitted to the ossicle 330, and the ossicle 330 vibrates. Then, the
vibration of the earlobe 330 is transmitted to the cochlea 340 and converted to an electrical
signal in the cochlea 340. This electrical signal is transmitted to the brain through the auditory
nerve 350, and the received sound is recognized in the brain. Thus, the air conduction sound is
transmitted from the cover panel 2 to the user.
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[0059]
Further, when the user holds the portable terminal 1 and applies the cover panel 2 of the
portable terminal 1 to the pinnae 300 of the user, the pinna 300 is vibrated by the piezoelectric
vibrating element 190. It is vibrated by the cover panel 2. The vibration of the pinna 300 is
transmitted to the tympanic membrane 320, and the tympanic membrane 320 vibrates. The
vibration of the tympanic membrane 320 is transmitted to the ossicle 330, and the ossicle 330
vibrates. Then, the vibration of the earlobe 330 is transmitted to the cochlea 340 and converted
into an electrical signal in the cochlea 340. This electrical signal is transmitted to the brain
through the auditory nerve 350, and the received sound is recognized in the brain. Thus, the
conductive sound is transmitted from the cover panel 2 to the user. In FIG. 11, the auricular
cartilage 300a inside the auricle 300 is also shown.
[0060]
Note that the conduction sound here is different from bone conduction sound (also called "bone
conduction sound"). Bone conduction sound is a sound that is recognized in the human brain by
vibrating the skull and stimulating the inner ear such as the cochlea directly by vibration of the
skull (also called vibration noise). In FIG. 11, for example, when the mandible 500 is vibrated, a
plurality of arcs 420 indicate transmission paths of sound signals when bone conduction sound
is recognized by the brain.
[0061]
Thus, in the present embodiment, air conduction sound and conducted sound are transmitted
from the cover panel 2 to the user of the portable terminal 1 by the piezoelectric vibration
element 190 appropriately vibrating the cover panel 2 on the front surface. Can. The user can
hear the air conduction sound from the cover panel 2 by bringing the ear (ear) into close
proximity to the cover panel 2. Also, the user can hear the air conduction sound and the
conduction sound from the cover panel 2 by bringing the ear (ear) into contact with the cover
panel 2. The structure of the piezoelectric vibrating element 190 according to the present
embodiment is devised so as to appropriately transmit the air conduction sound and the
conduction sound to the user. Various advantages occur by configuring the portable terminal 1
so as to transmit the air conduction sound and the conduction sound to the user.
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[0062]
For example, since the user can hear the sound by placing the cover panel 2 on his / her ear, the
user can make a call without being concerned about the position at which he / she places his /
her ear on the portable terminal 1.
[0063]
In addition, when the ambient noise is large, the user can make it difficult to hear the ambient
noise while pressing the ear against the cover panel 2 to increase the volume of the conducted
sound.
Therefore, the user can appropriately make a call even when the surrounding noise is loud.
[0064]
Also, even when the user attaches the earplug or the earphone to the ear, the user can recognize
the reception sound from the portable terminal 1 by applying the cover panel 2 to the ear (more
specifically, the pinnae). Can. In addition, even when the user attaches a headphone to his / her
ear, the user can recognize the reception sound from the portable terminal 1 by placing the cover
panel 2 on the headphone.
[0065]
A portion of the cover panel 2 to which the piezoelectric vibrating element 190 is attached is
relatively easy to vibrate. Therefore, the user brings the ear close to or pushes the ear against the
upper end of the cover panel 2 to which the piezoelectric vibrating element 190 is attached (in
particular, the center in the short direction of the upper end). Then, the sound from the cover
panel 2 can be easily heard.
[0066]
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Although only one piezoelectric vibrating element 190 is provided in the above example, a
plurality of piezoelectric vibrating elements 190 may be provided on the inner major surface 20
of the cover panel 2. For example, a plurality of piezoelectric vibrating elements 190 may be
arranged along the short direction of the cover panel 2. The piezoelectric vibrating element 190
may be provided with two or more piezoelectric vibrating elements 190.
[0067]
Although the piezoelectric vibrating element is mainly described as the vibrating element in the
above description, the vibrating element is not limited to the piezoelectric vibrating element. For
example, an eccentric motor (ERM: Eccentric Rotating Mass), a linear vibrator, etc. The cover
panel 2 may be vibrated for applications other than vibration for transmitting voices from the
vehicle. For example, the vibration at the start of the operation on the cover panel 2 by the user
or the vibration for notification of an incoming call may be used.
[0068]
In the above example, although the present invention is applied to a mobile phone as an example,
the present invention can be applied to mobile terminals other than mobile phones such as smart
phones, for example, tablet terminals etc. . The portable terminal may have a vibration element
inside, and may have a panel made of the above-mentioned crystal material vibrated by the
vibration element. Other mobile terminals other than mobile phones and tablet terminals include
watches, glasses, wigs, belts, portable recorders, portable players and the like. Moreover, in the
above-mentioned content, although the cover panel 2 was described as a panel, it may be except
the panel exposed towards the exterior like a cover panel.
[0069]
For example, when the glasses are a portable terminal in the present invention, a vibrating
element may be provided in the frame of the glasses, and the panel inside the frame may be
vibrated by the vibrating element, or the cover panel forming the outside of the frame is vibrated.
May be
[0070]
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As mentioned above, although the portable terminal 1 was demonstrated in detail, the abovementioned description is an illustration in all the aspects, Comprising: This invention is not
limited to it.
Further, the various modifications described above can be combined and applied as long as no
contradiction arises. And, it is understood that innumerable modifications not illustrated may be
assumed without departing from the scope of the present invention.
[0071]
EXAMPLE A sound pressure was measured in an anechoic chamber using a sound pressure
measuring apparatus (3560-C-T62 manufactured by B & K) to which a microphone (4128-D
manufactured by B & K) was attached. The following four types of sapphire panels were prepared
as test pieces.
[0072]
Sapphire panel 1: thickness 0.40 mm, main surface is sapphire single crystal A-plane sapphire
panel 2: thickness 0.45 mm, main surface is sapphire single crystal A-plane sapphire panel 3:
thickness 0.50 mm, main surface is sapphire single crystal A-plane sapphire panel 4: A
piezoelectric vibrating element (number of layers: 28 layers) at a thickness of 0.40 mm, 50 mm
from the lower side of the back surface of the sapphire single crystal R-plane sapphire panel, and
in the central portion in the horizontal direction ) Was installed. The piezoelectric vibrating
element was rectangular, and the piezoelectric vibrating element was installed such that the long
side of the piezoelectric vibrating element was substantially parallel to the lower side of the
sapphire panel.
[0073]
Then, a sapphire panel provided with a piezoelectric vibrating element was fixed to a circular
metal part (diameter 60 mm) having a hole with a diameter of 26 mm at the center so that the
piezoelectric vibrating element was positioned in the hole. In addition, the double-sided tape was
used for the said fixation.
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20
[0074]
A microphone was placed on the surface side of the sapphire panel so that the distance to the
fixed sapphire panel was 5.0 mm, and the vibration of the sapphire panel at a specific frequency
was collected by the microphone to measure the sound pressure.
[0075]
Moreover, the same measurement was performed using a glass panel (thickness: 0.70 mm) as a
comparison of a sapphire panel.
[0076]
The following shows the sound pressure results at the frequency of 1 kHz used in the call voice,
respectively.
[0077]
Sound pressure measurement result of sapphire panel 1: Sound pressure measurement result of
92.5 dB sapphire panel 2: Sound pressure measurement result of 90.4 dB sapphire panel 3:
Sound pressure measurement result of 86.0 dB sapphire panel 4: 94.8 dB glass panel Sound
pressure measurement result of: 94.3 dB From the above result, in the case of sapphire panel 3,
sufficient sound pressure was obtained.
[0078]
In the case of sapphire panels 1, 2 and 4, a sufficient sound pressure was obtained compared to
sapphire panel 3.
[0079]
Comparing the difference in sound pressure between the sapphire panel 1 and the sapphire
panel 2 with the difference in sound pressure between the sapphire panel 2 and the sapphire
panel 3, the increase in sound pressure when the thickness is 0.5 mm to 0.45 mm (4. 4 dB) is
larger than the increase in sound pressure (2.1 dB) when the thickness is changed from 0.45 mm
to 0.40 mm, and the sound pressure is significantly reduced by reducing the thickness of the
sapphire panel from 0.5 mm to 0.45 mm. It has been confirmed that it has improved.
[0080]
In the case of the sapphire panel 1 and the sapphire panel 4, a sound pressure comparable to the
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comparison result using the glass panel could be confirmed.
[0081]
By comparing the sound pressure in the case where the main surface is the R surface and the
case where the main surface is the A surface by comparing the sapphire panel 4 and the sapphire
panel 1, It turned out that the one was bigger.
[0082]
DESCRIPTION OF SYMBOLS 1 Mobile terminal 2 Cover panel 20 1st main surface 21 2nd main
surface 100 Control part 120 Display panel 120a Display surface 190 Piezoelectric vibration
element 260 sticking part
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