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DESCRIPTION JP2011188191

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DESCRIPTION JP2011188191
Abstract: To provide an audio output device capable of obtaining good acoustic characteristics
while enhancing drainage performance. SOLUTION: A ringing mechanism is provided which is
disposed in a housing, has a diaphragm, and is made to sound by vibrating the diaphragm, and is
formed between the diaphragm and the inner surface of the housing. A front air chamber, a
sound hole group formed in the housing, which causes the front air chamber to communicate
with the outside of the housing, and a control mechanism which controls the operation of the
ring mechanism. The control mechanism causes the ringing mechanism to ring so that the water
entering the front air chamber by the vibration of the diaphragm is drained through the sound
hole group. The housing has a central portion corresponding to the central portion of the front
air chamber, an outer peripheral portion corresponding to the outer peripheral portion of the
front air chamber, and an intermediate portion formed between the central region and the outer
peripheral region. Have. The sound hole group has an intermediate sound hole group provided in
the middle portion. [Selected figure] Figure 1B
Voice output device
[0001]
The present invention relates to an audio output device.
[0002]
An audio output device such as a mobile phone terminal has a housing and a speaker (ring
mechanism).
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The speaker is disposed inside the housing. The housing is provided with a sound hole so that the
sound emitted from the speaker is emitted to the outside.
[0003]
Water may intrude into the inside of the housing through the sound hole. Water penetration can
make it difficult for the speaker to output a desired sound. In order to remove the water that has
infiltrated into the housing, for example, the sound output device can only be shaken or the
water can be evaporated. It is difficult to remove the water once in the case.
[0004]
The related art is described in Patent Document 1 (Japanese Patent Application Publication No.
2008-167097). In Patent Document 1, in the electronic device having a structure in which the
first case and the second case are folded, the receiver is located at the first case so as to face the
second case in the closed state. The point of providing the sound hole and the point of providing
the receiver sub sound hole for causing the first casing to flow out the liquid retained in the first
case by the air flowing into the receiver sound hole are disclosed.
[0005]
Another related technology is described in Patent Document 2 (Japanese Patent Application LaidOpen No. 2000-201388). In Patent Document 2, an electrical signal / acoustic transducer
provided inside a housing, a sound passage hole penetrating through the housing inside and
outside, an electrical signal / acoustic transducer and a sound passage hole A structure of an
electric signal / sound conversion portion of an electronic device including a sound guide portion
to be communicated with, wherein at least a part of an inner side end portion of a casing of the
sound transmission hole is positioned at a corner portion of the sound guide portion And the
structure of the electrical signal / sound converter of the electronic device is described.
According to the description of Patent Document 2, the foreign matter can be discharged to the
outside from the corner where the foreign matter which has intruded into the inside of the sound
guide portion tends to stay through the sound passing hole.
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[0006]
Another related technology is described in Patent Document 3 (Japanese Patent Application LaidOpen No. 2007-67897). According to Patent Document 3, after increasing the applied voltage of
the output amplifier connected to the built-in speaker behind the speaker grille than at the time
of audio signal output, a low frequency continuous signal is input to the amplifier instead of the
audio signal and the output Thus, a portable wireless communication device is disclosed which
vibrates the speaker to drain out the intruding water in the speaker grill. Patent Document 3
describes that a plurality of slit-like members formed in the lateral direction are provided in
parallel, and that each slit has a structure opened obliquely downward.
[0007]
Moreover, the waterproof speaker which apply | coated the water repellent coating material to
the diaphragm of the speaker is disclosed by patent document 4 (Unexamined-Japanese-Patent
No. 2000-138987) as another related technique.
[0008]
JP 2008-167097 JP 2000-201388 JP 2007-67897 JP 2000-138987
[0009]
As described in Patent Document 2, it is considered that the foreign matter can be easily
discharged by providing the sound passage hole at the corner.
However, when water intrudes into the housing, the water remains in the central portion of the
sound guide portion, which makes drainage difficult.
[0010]
Moreover, in order to improve drainage capacity, it is conceivable to increase the area of the
sound hole.
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However, if the area of the sound hole is increased, water may easily infiltrate. In addition, when
the area of the sound hole is increased, the sound pressure at the acoustic resonance point is
reduced, which makes it difficult to obtain good acoustic characteristics.
[0011]
A sound output device according to the present invention includes a casing, a ringing mechanism
disposed in the casing, having a diaphragm, and vibrating by vibrating the diaphragm, the
diaphragm and the inner surface of the casing. And a control mechanism for controlling the
operation of the sound hole group and the ring mechanism which are formed between the front
air chamber and the housing and which connects the front air chamber to the outside of the
housing. And The control mechanism causes the ringing mechanism to ring so that the water
entering the front air chamber by the vibration of the diaphragm is drained through the sound
hole group. The housing has a central portion corresponding to the central portion of the front
air chamber, an outer peripheral portion corresponding to the outer peripheral portion of the
front air chamber, and an intermediate portion formed between the central region and the outer
peripheral region. Have. The sound hole group has an intermediate sound hole group provided in
the middle portion.
[0012]
ADVANTAGE OF THE INVENTION According to this invention, while improving drainage
performance, the audio | voice output apparatus which can acquire a favorable acoustic
characteristic is provided.
[0013]
It is the schematic which shows the audio | voice output apparatus which concerns on 1st
Embodiment.
It is the schematic which shows the mobile telephone terminal in a closed state. It is a sectional
view showing AA section of Drawing 1B. It is a block diagram which shows a control mechanism
roughly. It is a flow chart which shows the operation method at the time of drainage of a voice
output device. It is sectional drawing which shows roughly a mode when a diaphragm vibrates. It
is a flowchart which shows the operation | movement method of the audio | voice output
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apparatus which concerns on the modification of 1st Embodiment. It is a schematic sectional
drawing which shows the audio | voice output apparatus which concerns on 2nd Embodiment. It
is a schematic sectional drawing which shows the audio | voice output apparatus which concerns
on 3rd Embodiment.
[0014]
Embodiments of the present invention will be described below with reference to the drawings.
[0015]
First Embodiment FIG. 1A is a schematic view showing an audio output device according to the
present embodiment.
In the present embodiment, a foldable cellular phone terminal 1 will be described as an audio
output device. FIG. 1A shows the mobile phone 1 in the open state.
[0016]
As shown in FIG. 1A, the mobile phone 1 includes a first housing 2 and a second housing 3. The
first housing 2 and the second housing 3 are connected so as to be foldable.
[0017]
The first housing 2 is provided with a receiver unit 4 and a display unit 5. The receiver unit 4 is
provided to output the voice of the other party during a call. At the time of a call, the user can
listen to the voice of the other party by listening to the receiver unit 4. The display unit 5 is a
portion for displaying information required for the user. The display unit 5 displays information
such as characters, symbols, and figures.
[0018]
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The key operation unit 4 and the microphone unit 6 are provided in the second housing 3. The
key operation unit 4 is a portion used by the user to operate the mobile phone terminal 1. The
user can use the key operation unit 4 to input dial information and input various setting
information. The microphone unit 5 is provided to convey the user's voice to the other party
during a call. The microphone unit 5 collects the user's voice and converts it into an electrical
signal. The electrical signal is sent to the device at the other end of the call.
[0019]
FIG. 1B is a schematic view showing the mobile phone 1 in the closed state. As shown in FIG. 1B,
a speaker 7 is disposed inside the first housing 2 as a ringing mechanism. A sound hole group 8
is provided in the first housing 2 in order to emit the sound emitted from the speaker 7 to the
outside. A front air chamber to be described later is formed between the speaker 7 and the inner
wall of the first housing 2. At the time of an incoming call, at the time of downloading a melody,
at the time of using the hands-free function, etc., the speaker 7 emits an audible sound. The
audible sound emitted is emitted from the front air chamber to the outside through the sound
holes 8. This allows the user to know the presence of an incoming call and listen to the desired
music.
[0020]
Here, the sound hole group 8 includes an intermediate sound hole group 8-1 and a central sound
hole 8-2. The central sound hole 8-2 is provided at a position facing the central portion of the
front air chamber. The central portion is a portion corresponding to the center of gravity of the
front air chamber.
[0021]
On the other hand, the middle sound hole group 8-1 is provided in the middle portion. The
middle portion is a portion formed between the central portion and the outer peripheral portion.
The central portion is a portion facing the central portion of the front air chamber, and the outer
peripheral portion is a portion corresponding to the outer peripheral portion of the front air
chamber. The intermediate sound hole group 8-1 has a plurality of intermediate sound holes. The
plurality of intermediate sound holes are aligned along a circumference centered on the central
sound hole 8-2.
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[0022]
Next, the internal configuration of the first housing 2 will be described.
[0023]
FIG. 2 is a cross-sectional view showing the AA cross section of FIG. 1B and shows the cross
section of the first housing 2.
As shown in FIG. 2, the first housing 2 has a front and a back. The front surface is a surface
facing the second housing 3 in the closed state, and the rear surface is a surface facing outward
in the closed state. As shown in FIG. 2, a substrate 10 and a speaker 7 are disposed inside the
first housing 2. Further, the display unit 5 is fitted on the front surface of the first housing 2.
[0024]
The display unit 5 has a front liquid crystal 11 and a screen 9. The front liquid crystal 11
includes an LCD (Liquid Crystal Display), a backlight, and the like that display characters,
symbols, figures, and the like. The screen 9 is formed of a transparent material and protects the
surface of the front liquid crystal 11.
[0025]
The speaker 7 includes a frame 17, a protector 20, a diaphragm 18, a voice coil 16, a yoke 14,
and a magnet 15. Here, a rib 22 having a shape corresponding to the frame 17 is formed on the
inner wall of the rear surface of the first housing 2. The rib 22 protrudes from the inner wall
toward the inside of the first housing 2. The height of the rib 22 is, for example, about 0.5 to 1.0
mm. The protector 20 is attached to the tip of the rib 22 via the cushion 21 (elastic member).
The protector 20 is provided to protect the diaphragm 18 and is sandwiched between the
cushion 21 and the frame 17. The frame 17 is provided to support the diaphragm 18 and the
yoke 14. The yoke 14 is disposed so as to protrude from the bottom surface of the frame 17
toward the front side. A magnet 15 is disposed on the back side of the yoke 14. The diaphragm
18 is disposed on the back side of the magnet 15 and the yoke 14. The voice coil 16 is connected
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to the diaphragm 18 and is located in the magnetic field formed by the yoke 14 and the magnet
15. In the speaker 7, when positive and negative currents flow through the voice coil 16, the
voice coil 16 is displaced by the magnetic field formed by the yoke 14 and the magnet 15. As a
result, the diaphragm 18 vibrates and a sound is output.
[0026]
Here, it is preferable that the surface of the diaphragm 18 is subjected to water repellent finish
by coating of a fluorine resin or the like. Since the surface of the diaphragm 18 has water
repellency, when the diaphragm 18 vibrates, water in the front air chamber 23 is easily repelled
and drained easily.
[0027]
Moreover, the speaker 7 is comprised so that waterproof structure may be formed. Specifically,
the speaker 7 is disposed so as to divide the inside of the first housing 2 into the front air
chamber 23 and the inner space 19. The front air chamber 23 is a space formed between the
diaphragm 18 and the inner wall of the first housing 2. The frame 17 and the protector 20 are
connected to the inner wall of the first housing 2 via the cushion 21 so that the water entering
the front air chamber 23 does not leak to the inner region 19 side. Further, the cushion 21 is
sufficiently compressed and disposed so that the water entering the front air chamber 23 does
not leak to the inner region 19 side. The outer peripheral portion of the diaphragm 18 is also
connected to the frame 17 on the entire periphery so that the water entering the front air
chamber 23 does not leak to the inner region 19 side.
[0028]
Next, the substrate 10 will be described. The substrate 10 is disposed in the inner area 19.
Although not illustrated in FIG. 2, on the substrate 10, a control component (DSP (Digital Signal
Processor) for realizing various functions (drain function, melody ringing, incoming / outgoing
call, mail transmission / reception, etc.) of the mobile phone terminal 1. ), CSP (Chip Scale
Package), sound source IC, D / A converter, amplifier, resistor, capacitor, etc. are mounted.
[0029]
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Here, a control mechanism that controls the operation of the speaker 7 is mounted on the
substrate 10. FIG. 3 is a block diagram schematically showing the control mechanism. As shown
in FIG. 3, the control mechanism includes a control unit 27, a sound source IC 24, a D / A
converter 12, and an SPK amplifier 13. The sound source IC 24 stores sound source information.
The control unit 27 is realized by the CPU executing a control program stored in a ROM (Read
Only Memory) (not shown). The control unit 27 generates a ringing signal based on the sound
source information stored in the sound source IC 24. The ringing signal is converted to an analog
signal by the D / A converter 12, amplified by the SPK amplifier 13, and then supplied to the
speaker 7. In the speaker 7, a current flows through the voice coil 16 in response to the ringing
signal, and the diaphragm 18 vibrates.
[0030]
The sound source information includes sound source information for an audible sound used to
give the user a voice, and sound source information for drainage used for drainage. When the
sound source information for audible sound is selected by the control unit 27, a signal for
audible sound is supplied to the speaker 7 as a ringing signal. In this case, the speaker 7 emits an
audible sound. As the audible sound, for example, a start sound generated when the power is
turned on, a ring tone, a music reproduction sound, a shutter sound of a camera, an open / close
signal sound, and a call sound at the time of hands-free call can be mentioned. On the other hand,
when the drainage sound source information is selected by the control unit 27, the drainage
signal is supplied to the speaker 7 as a ringing signal. In this case, in the speaker 7, the
diaphragm 18 vibrates so that the water which has entered the front air chamber 23 is drained.
[0031]
As the drainage sound source information, for example, information in which the diaphragm 18
vibrates at a resonance frequency, and information in which the diaphragm 18 vibrates at a
frequency (for example, 100 Hz) lower than the audio frequency are preferably used. If the
diaphragm 18 vibrates at the resonance frequency, the vibration amplitude can be maximized,
and the water in the front air chamber 23 is drained quickly. If the diaphragm 18 vibrates at a
frequency lower than the audio frequency, drainage can be performed without noticing that the
user or a nearby person is draining. Moreover, it is also preferable to use information such that
the vibration frequency of the diaphragm 18 changes with time within a preset frequency band
as the drainage sound source information. The frequency at which a high drainage effect can be
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obtained is considered to be different depending on the area of the sound hole group 8 and the
volume of the front air chamber 23. By varying the vibration frequency of the diaphragm 18, it is
possible to cover a frequency band effective for drainage.
[0032]
Next, an operation method of the audio output device according to the present embodiment will
be described. FIG. 4 is a flowchart showing an operation method of the voice output device at the
time of drainage.
[0033]
Step S-1: It is assumed that the mobile phone terminal 1 gets wet with water. In this case, water
may infiltrate the front air chamber 23 through the sound hole 8. In such a case, the user uses
the key operation unit 4 to input a drainage instruction to the mobile phone terminal 1. In the
mobile phone 1, the control unit 27 determines whether a drainage instruction has been input.
When the drainage instruction is received, the control unit 27 performs the operation of the next
step S-2.
[0034]
Step S-2: When a drainage instruction is received, the control unit 27 selects drainage sound
source information from the sound source IC 24, and generates a drainage signal as a ringing
signal. Thereby, in the speaker 7, the diaphragm 18 vibrates. FIG. 5 is a cross-sectional view
schematically showing how the diaphragm 18 vibrates. As shown in FIG. 5, the water entering
the front air chamber 23 is discharged to the outside through the sound holes 8 by the vibration
of the diaphragm 18.
[0035]
Step S-3: Thereafter, when the user inputs a drainage stop instruction to the mobile phone
terminal 1, the control unit 27 stops the operation of the speaker 7. The control unit 27 may
automatically stop the operation of the speaker 7 when a preset time has elapsed.
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[0036]
Here, according to the present embodiment, since the intermediate sound hole group 8-1 is
provided, drainage performance is enhanced. As described above, the intermediate sound hole
group 8-1 is provided at a position corresponding to the center of the front air chamber 23 and
the outer periphery of the front air chamber 23. When a sound hole is provided at a position
corresponding to the outer peripheral portion of the front air chamber 23, water tends to stay in
the central portion of the front air chamber 23. On the other hand, in the case where the sound
hole is provided only in the central portion of the front air chamber 23, the water tends to stay in
the outer peripheral portion of the front air chamber 23. On the other hand, in the present
embodiment, since the intermediate sound hole group 8-1 is provided, water existing in the outer
peripheral portion of the front air chamber 23 is drained through the intermediate sound hole
group 8-1. It will be easier. Further, the water present in the central portion of the front air
chamber 23 is drained by the central sound hole 8-2. That is, according to the present
embodiment, even if water is present in any part of the front air chamber 23, drainage can be
easily performed. When water is accumulated in the front air chamber 23, when the speaker 7
generates an audible sound, the vibration of the diaphragm 18 is suppressed, and the sound
pressure of the emitted audible sound becomes extremely small. On the other hand, according to
the present embodiment, since drainage can be easily performed, it is possible to prevent a drop
in the sound pressure of the audible sound.
[0037]
Further, in the present embodiment, a plurality of intermediate sound holes are arranged along
the circumference centered on the central sound hole 8-1. Adopting such a layout makes it
possible to easily drain water regardless of where in the front air chamber 23 water is present.
[0038]
Moreover, in the present embodiment, as a result of the improvement of the drainage efficiency,
the area of the sound hole group 8 can be reduced. As a result, the drop in sound pressure at the
acoustic resonance point can be minimized. Therefore, the acoustic characteristic in the case
where the speaker 7 outputs an audible sound can be maintained in a good state.
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[0039]
Moreover, it is preferable that the area of the sound hole group 8 is adjusted to such an area that
the drainage effect is maximally exhibited. Such an area can be adjusted based on the vibration
power of the diaphragm 18 and the volume of the front air chamber 23. For example, as
described in Patent Document 3 (Japanese Patent Application Laid-Open No. 2007-67897), when
a voltage higher than that at the time of audio signal output is applied to the output amplifier, the
load due to the overvoltage is applied to the speaker, causing failure There is. On the other hand,
by adjusting the area of the sound hole group 8, it is not necessary to specially add a signal
having a maximum voltage higher than the audible sound signal to the speaker 7 as a drainage
signal. As a result, it is possible to reduce the possibility of breakdown of the speaker 7 without
burdening the speaker 7 with overvoltage.
[0040]
In the present embodiment, the case where the drainage operation is performed according to the
drainage instruction given by the user has been described. However, the drainage operation does
not necessarily have to be performed in response to the drainage instruction given by the user.
This point will be described using a modification.
[0041]
FIG. 6 is a flowchart showing an operation method of the audio output device according to the
modification of the present embodiment. In the audio output device according to this
modification, the operation of the control unit 27 is changed. The other configurations and
operations are similar to those of the present embodiment.
[0042]
Step S-4: At the time of an incoming call, an alarm or the like, an instruction indicating that an
audible sound is to be generated is given to the control unit 27.
[0043]
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Step S-5: When an instruction to generate an audible sound is received, the control unit 27
selects drainage sound source information from the sound source information.
As a result, a drainage signal is supplied to the speaker 7 as a ringing signal. As a result, the
diaphragm 18 vibrates in the speaker 7, and the water present in the front air chamber 23 is
drained. The drainage signal is supplied for a predetermined time (for example, 5 seconds).
[0044]
Step S-6: After the drainage signal is supplied for 5 seconds, the control unit 27 selects sound
source information for audible sound from the sound source information. As a result, an audible
sound signal is supplied to the speaker 7 as a ringing signal. As a result, an audible sound is
emitted from the speaker 7 and the user can hear the sound emitted by the speaker 7.
[0045]
Step S-7: Thereafter, when an instruction to stop the audible sound is given to the control unit
27, the control unit 27 stops the supply of the audible sound signal, and the process ends.
[0046]
According to the operation of the above-mentioned modification, drainage processing is
performed as a pre-operation when generating an audible sound.
Therefore, the user does not need to perform a special operation to perform the drainage
process, and the convenience can be improved.
[0047]
As described above, according to the present embodiment, drainage can be efficiently performed
by devising the layout of the sound hole group 8.
[0048]
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In the present embodiment, the control unit 27 supplies the drainage signal to the speaker 7 at a
timing different from the timing at which the audible signal is supplied to the speaker 7.
However, the control unit 27 may be configured to superimpose the drainage signal on the
audible sound signal and supply it to the speaker 7.
[0049]
Further, in the present embodiment, the case where the first housing 2 is provided with the rib
22 has been described (see FIG. 2). However, as long as the speaker 7 is supported by the first
housing 2 so that the water in the front air chamber 23 does not leak to the internal space 19
side, the rib 22 does not necessarily have to be provided. For example, the front air chamber 23
may be formed by bringing the speaker 7 and the inner wall of the first housing 2 into close
contact with each other via a double-sided tape or a cushion.
[0050]
Moreover, in this embodiment, the case where the protector 20 was provided was demonstrated
(refer FIG. 2). However, the protector 20 does not necessarily have to be provided, and the
protector 20 may not be provided depending on the mounting position and conditions of the
speaker 7.
[0051]
Further, in the present embodiment, the case where the speaker 7 is used as the ringing
mechanism has been described. However, the ringing mechanism is not limited to the speaker 7.
For example, as a ringing mechanism, a fixed telephone, a video camera, a digital camera, a PHS,
an IC recorder, a receiver, a piezoelectric speaker, a music player, and a composite part may be
used.
[0052]
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Further, in the present embodiment, the case where the foldable type mobile telephone terminal
is used as the voice output device has been described. However, the voice output device may be
any device in which the ringing mechanism is mounted, and is not limited to the foldable mobile
phone terminal. For example, as an audio output device, it is also possible to use an integrated
mobile phone terminal, a slide type mobile phone terminal, a pager, a PHS, a music player, a
digital camera, or the like.
[0053]
Further, in the present embodiment, the case where the sound output device 1 is formed with the
waterproof structure has been described. That is, the case where the speaker 7 is attached is
described so that the water in the front air chamber 23 does not leak to the internal space 19
side. However, even if the sound output device 1 does not have a waterproof structure, the
present invention is applicable. In this case, the power of the audio output device 1 is turned off
in order to avoid a short circuit of the electronic component due to water wetting. Then, after
waiting for the water to dry, the power is turned on. Here, if the signal for drainage is supplied to
the speaker 7 at the timing when the power is turned on, the water accumulated in the front air
chamber 23 can be discharged, and it is possible to restore the original good acoustic
characteristics It becomes.
[0054]
Further, in the present embodiment, the case has been described where the intermediate sound
hole group 8-1 is disposed along the circumference centered on the central sound hole 8-2.
However, the intermediate sound hole group 8-1 does not necessarily have to be disposed along
the entire circumference of the circumference, and when the position is difficult in design, the
middle sound hole group 8-1 is provided on a part of the circumference. It is also good. Even in
this case, the water accumulated in the portion where the sound hole is not provided by the
vibration of the diaphragm is easily drained through the central sound hole 8-2 or the middle
sound hole group 8-1.
[0055]
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Second Embodiment Subsequently, a second embodiment will be described. FIG. 7 is a schematic
cross-sectional view showing the audio output device 1 according to the present embodiment. In
the present embodiment, a dustproof mesh member 25 is added to the first embodiment. About
the other point, since the same configuration as that of the first embodiment can be adopted, the
detailed description will be omitted.
[0056]
As shown in FIG. 7, the dustproof mesh member 25 is provided in the front air chamber 23. The
dustproof mesh member 25 is provided on the back side of the diaphragm 18, and divides the
front air chamber 23 into a first chamber 23-1 and a second chamber 23-2. The first chamber
23-1 is a space formed on the back side of the dustproof mesh member 25, and the second
chamber 23-2 is a space formed on the front side of the dustproof mesh member 25. The end of
the dustproof mesh member 25 is sandwiched between the rib 22 and the cushion member 21.
Further, the dustproof mesh member 15 is subjected to water repellent finish.
[0057]
According to the present embodiment, the dustproof mesh member 25 prevents foreign matter
such as dust that has entered the first chamber 23-1 from the sound hole group 8 from entering
the second chamber 23-2. In addition, since the dustproof mesh member 25 is subjected to the
water repelling process, the inflow of water to the second chamber 23-2 side is prevented to
some extent.
[0058]
In the present embodiment, when the voice output device 1 is submerged, water is accumulated
in the first chamber 23-1. Also in the present embodiment, when the control unit 27 supplies a
drainage signal to the speaker 7, the diaphragm 18 vibrates. Due to the vibration of the
diaphragm 18, the dustproof mesh member 25 is also vibrated by air vibration. As a result, the
water accumulated in the first chamber 23-1 is repelled by the dustproof mesh member 25 and
discharged to the outside through the sound hole group 18. At this time, it is preferable that the
drainage signal is supplied to the speaker 7 so that the dustproof mesh member 25 vibrates at its
resonance frequency.
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[0059]
In the present embodiment, the case where the end of the dustproof mesh member 15 is
sandwiched between the cushion 21 and the rib 22 has been described. However, the dustproof
mesh member 15 may be disposed so as to prevent foreign matter such as dust from entering
the second chamber 23-2 side. For example, the dustproof mesh member 15 may be attached to
the protector 20.
[0060]
Third Embodiment Next, a third embodiment will be described. FIG. 8 is a schematic crosssectional view showing the audio output device according to the present embodiment. In the
present embodiment, the dustproof mesh member 25 in the second embodiment is changed to a
waterproof sheet 26. About the other point, since the same composition as a 2nd embodiment
can be adopted, detailed explanation is omitted.
[0061]
The waterproof sheet 26 is formed of a material that does not allow water to permeate. The
waterproof sheet 26 can be formed of, for example, a pet (PET; polyethylene terephthalate) film
or the like.
[0062]
Providing the waterproof sheet 26 prevents the water accumulated in the first chamber 23-1
from leaking to the second chamber 23-2. Further, as in the second embodiment, the foreign
matter that has entered the first chamber 23-1 is also prevented from entering the second
chamber 23-2. Also in the present embodiment, when draining, the waterproof sheet 26 vibrates
due to the vibration of the diaphragm 18, and the water accumulated in the first chamber 23-1 is
drained. At this time, the drainage signal is preferably supplied to the speaker 7 so that the
waterproof sheet 26 vibrates at the resonance frequency of the waterproof sheet 26.
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[0063]
According to the present embodiment, by using the waterproof sheet 26, the water that has
entered the front air chamber 23 can be drained more efficiently than in the first embodiment.
However, when the waterproof sheet 26 is provided, an expense required for the waterproof
sheet 26 occurs. In addition, a space for providing the waterproof sheet 26 in the front air
chamber 23 is required. Furthermore, when producing an audible sound, the presence of the
tarpaulin 26 may make it difficult to emit the desired sound. From these viewpoints, it is
preferable to adopt the configuration of the first embodiment.
[0064]
DESCRIPTION OF SYMBOLS 1 mobile phone terminal (voice output device) 2 first case 3 second
case 4 receiver 5 display 6 microphone 7 speaker (sounding mechanism) 8 sound hole group 8-1
middle sound hole group 8-2 central sound Hole 9 Screen 10 Substrate 11 Front LCD 12 D / A
Converter 13 SPK Amplifier 14 Yoke 15 Magnet 16 Voice Coil 17 Frame 18 Diaphragm 19
Internal Space 20 Protector 21 Cushion 22 Rib 23 Front Air Room 24 Sound Source IC (Control
Mechanism) 25 Dustproof mesh member 26 tarpaulin 27 control part
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