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DESCRIPTION JP2008141694

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DESCRIPTION JP2008141694
The present invention realizes a miniaturized mobile telephone terminal while maintaining the
function as a loudspeaker while realizing an acoustic structure that ensures acceptable sound
quality as a receiver. A housing 10 has a speaker opening 103 and a leak hole 106. The speaker
opening 103 is provided at a position where the user of the housing 10 puts an ear, and the leak
hole 106 is not closed by the user. The speaker 308 is provided at a position, and the resonance
box 309 for sealing the back side of the speaker diaphragm 311 is provided, and the housing 10
is configured such that the speaker front sound is output from the speaker opening 103 and the
leak hole 106. Provided inside the As a result, while realizing an acoustic structure for securing
sound quality acceptable as a receiver, a pipe connecting a speaker and the speaker opening 103
and the leak hole 106 is not necessary, so a miniaturized mobile phone terminal can be realized. .
[Selected figure] Figure 1
Speaker apparatus and mobile phone terminal equipped with the same
[0001]
The present invention relates to a speaker device in which a user listens and listens like a
speaker of a mobile telephone terminal, and a mobile telephone terminal provided with the same.
[0002]
Generally, a frequency band used for a call is 300 Hz to 3.4 kHz.
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And a person is easy to hear as it is a flat frequency response characteristic. Specifically, if the
low frequency band around 300 Hz has a stronger characteristic than the high frequency band
around 2 kHz, it will be difficult to hear in a muffled manner and conversely, if the high
frequency band is strong, it will be Kinkin. It becomes difficult to hear how to hear it.
[0003]
Then, when using the mobile phone terminal, the user brings the mobile phone terminal into
close contact with the ear in order to listen to the call voice. However, it is impossible to make
close contact without gaps. As a result, some gaps occur and sound leakage occurs. As a result,
the frequency response characteristic is not flat. In particular, when a sound leak occurs, the
acoustic impedance is reduced and the volume of the low frequency band is reduced. As a result,
the call voice becomes very difficult to hear.
[0004]
Therefore, as a method for improving the characteristic deterioration caused by the gap between
the ear and the mobile phone terminal, Patent Document 1 and Patent Document 2 disclose a
method for improvement by a structure such as providing a sound emission hole.
[0005]
In Patent Document 1, as shown in FIG. 7, in order to obtain a desired speech voice quality, the
sound radiated from the opening 71 is a hole 72 provided near the opening from the gap
between the ear and the housing. In the following, there is described a structure in which it exits
to the free acoustic space outside the housing via a leak hole).
[0006]
Further, in Patent Document 2, a passage (leakage hole) is provided outside the transducer
(speaker) within the diameter of the measurement ear to connect the space between the
measurement ear and the housing with the free acoustic space outside the housing. The structure
is described.
[0007]
That is, in both documents, a technique is disclosed in which the influence of the decrease in
acoustic impedance is reduced and a flat frequency response characteristic is approached by
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providing leak holes.
[0008]
Further, in Patent Document 3, as shown in FIG. 8, an acoustic hole 83 is provided in the surface
(position) constantly exposed to the outside separately from the opening 81 in the front of the
speaker, and the acoustic hole 83 and the speaker are The structure connected by the tube 82 is
described.
[0009]
Here, in the present specification, the function of outputting a call voice (for example, an output
of about 10 mW) on the assumption that the user listens in a state in which the ear is in close
contact with the housing is called a receiver function. The function of outputting (for example,
about 0.5 W output) a received voice or the like by a speaker phone is referred to as a
loudspeaker function.
[0010]
And, in the loudspeaker function, it is necessary to be able to notify users in the vicinity even in a
noisy environment, so it is necessary to sound as loud as possible.
For that purpose, it is necessary not only to increase the output of the speaker but also to
acoustically separate the sound emitted from the front of the speaker and the sound emitted
from the back.
Because the sound emitted from the back of the speaker is in antiphase with the sound emitted
from the front of the speaker, the sound pressure from the sound emitted from the front is
degraded if the sound emitted from the back is synthesized with the sound emitted from the
front It is because it
[0011]
And as shown in FIG. 6, the structure which isolate | separates from the radiation sound from a
front is described in patent document 1 by sealing the space from which the radiation sound
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from the back of a speaker is emitted.
JP-A-2000-49920 (publication date: February 18, 2000) JP-A-2002-501684 (publication date:
January 15, 2002) JP-A-2003-60757 (publication date: 2003 2) March 28)
[0012]
However, in the above-described conventional configuration, it is difficult to miniaturize the
mobile phone terminal while providing the leak hole at a position where it is not blocked by an
earlobe or the like.
[0013]
The reason is that the leak holes described in Patent Documents 1 and 2 need to be provided in
the housing ear area, but must be provided outside the diameter of the speaker, so the ear must
be used. It will be provided at the end of the area.
Then, the possibility of the leak hole being blocked by an earlobe or the like is increased.
[0014]
Further, according to the invention described in Patent Document 3, the leak hole (described as
the acoustic hole in Patent Document 3) is provided on the surface different from the surface on
which the user puts his ear, so the leak hole is blocked by the user. There is a low possibility of
peeling.
However, since the housing external space and the speaker front acoustic space are connected by
a pipe-like structure, if a thick pipe structure is formed in a thin casing, it is difficult to
miniaturize the portable telephone terminal.
[0015]
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Furthermore, in order to reduce the decrease in acoustic impedance due to sound leakage, it is
desirable that the size of the leak hole be large.
This is because in order to minimize the influence of acoustic impedance reduction due to sound
leakage, it is necessary to make a structure of low acoustic impedance that is not affected in
advance.
[0016]
And the speaker which has a receiver function is generally arrange | positioned around the
display apparatus which is a tip part of a mobile telephone terminal generally.
In this case, the installation space of the speakers is also limited. In addition, in order to promote
miniaturization, it is often difficult to arrange a plurality of speakers for the receiver function and
the loudspeaker function. In such a case, at least one unit of speaker will be used for both
functions. As a speaker of such a common unit, a speaker for a loudspeaker function is used. The
reason is that the speaker for the receiver function has a low output sound pressure and is not
suitable for the use of the loudspeaker function, since it is assumed that the speaker sounds near
the ear. And in the loudspeaker function, it is effective to make the sound emission hole larger in
order to make the sound as loud as possible. Furthermore, the speaker itself also needs to have a
large diameter in order to output a large volume.
[0017]
The present invention has been made in view of the problem of how to miniaturize the speaker
device while maintaining the acceptable sound quality as a receiver as described above, and the
object is to further miniaturize the speaker device. It is an object of the present invention to
provide a speaker device and a mobile phone terminal having the same.
[0018]
In order to solve the above-mentioned subject, a speaker device concerning the present invention
equips an inside with a speaker, and a speaker device which has a case where two or more
openings are provided, A part of the above-mentioned opening is the above-mentioned case It is
provided in the position where the user of the body applies the ear, the other opening is provided
in the position where it is not closed by the user, and the speaker is provided with the back
sealing part which seals the back side of the speaker diaphragm It is characterized in that it is
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provided inside the housing so that a front sound is emitted from the opening.
[0019]
According to the above configuration, the back side of the speaker diaphragm is sealed by the
back sealing portion, so the influence of the front sound of the speaker from the back sound is
reduced.
That is, the speaker front sound and the back sound are acoustically separated and do not
interfere with each other, so that the sound pressure deterioration of the speaker front sound can
be prevented.
As a result, if the loudness is the same, the diameter of the speaker can be further reduced, and
the device can be miniaturized.
[0020]
Further, according to the above configuration, the front sound of the speaker is transmitted to
the entire inside of the housing except the rear sealing portion on the rear side of the speaker
diaphragm. Therefore, even if there is no pipe or the like connecting the front side of the speaker
and the opening of the housing, the speaker front sound is transmitted to the opening of the
housing. As a result, it is not necessary to provide a pipe or the like, and the number of members
constituting the inside of the apparatus can be reduced, so that the entire apparatus can be
miniaturized.
[0021]
Furthermore, since the frontal sound of the speaker is transmitted to the entire inside of the
housing, the openings other than the openings provided at the positions where the user puts
their ears can be provided at arbitrary positions not blocked by the user. As a result, it is possible
to provide the above-mentioned other opening for reducing the influence of sound leakage and to
make the sound entering the user's ear a good quality, at the optimum position for the
miniaturization of the device. Play.
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[0022]
Furthermore, the speaker device according to the present invention is preferably portable.
[0023]
A mobile telephone terminal according to the present invention is characterized by comprising
the above-mentioned speaker device.
[0024]
The above speaker device can be suitably used for a portable cellular phone terminal.
[0025]
Furthermore, the speaker device according to the present invention shares the above-mentioned
speaker as a loudspeaker for notifying a user of a notification sound of an incoming call and a
warning sound to a nearby user, and a speaker for a receiver for outputting a call voice.
preferable.
[0026]
According to the above configuration, since one speaker plays two roles of a loudspeaker and a
speaker for a receiver, it is not necessary to provide a speaker that plays each role.
Thus, the number of speakers can be reduced.
[0027]
As a result, there is a further effect that a miniaturized cellular phone terminal can be realized.
[0028]
As described above, in the speaker device according to the present invention, a part of the
opening is provided at a position where the user of the housing applies an ear, and the other
opening is provided at a position not blocked by the user. Is provided with a back sealing portion
that seals the back side of the speaker diaphragm, and the speaker is provided inside the housing
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so that the front sound of the speaker is emitted from the opening; A structure such as a pipe
connecting the opening of the case is not necessary, and the entire apparatus can be
miniaturized.
[0029]
A mode for carrying out the present invention will be described with reference to FIGS. 1 to 6.
[0030]
FIG. 3 shows an example in which the present invention is applied to a straight type mobile
telephone terminal 100. As shown in FIG.
[0031]
As shown in FIG. 3, the mobile phone terminal 100 includes a key operation unit 101, a display
unit 102, a speaker opening (opening) 103, a back housing 104, a front housing 105, and a leak
hole (opening) 106. .
The housing 10 is configured by combining the back side housing 104 and the front side
housing 105.
In the present embodiment, as shown in FIG. 1 to be described later, the one provided with the
resonance box 309 inside the housing 10 and the speaker unit 307 inside the resonance box 309
is referred to as a speaker device.
[0032]
Next, FIG. 1 is a cross-sectional view showing the inside of the mobile phone terminal 100. As
shown in FIG.
[0033]
As shown in FIG. 1, a speaker unit 307 is provided inside the housing 10.
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The speaker unit 307 is provided inside a resonance box (rear sealing portion) 309 that seals the
rear side of the diaphragm 311 of the speaker 308.
A speaker 308 is provided inside the speaker unit 307.
A resonant box 309 is provided in intimate contact with the inner end of the back housing 104.
In the speaker unit 307, the end on the front side of the speaker is fixed to the inner surface on
the front side of the resonance box 309.
Furthermore, a speaker opening 103 is provided in the housing 10 on the front of the speaker
and on the opposite side of the key operation unit 101 of the display unit 102, and a leak hole
106 is provided on the side of the speaker.
[0034]
A speaker back hole 310 is provided on the back of the speaker unit 307 so that the space on the
back side of the diaphragm 311 of the speaker 308 can be acoustically connected to the inside of
the resonance box 309.
Further, as described above, the speaker unit 307 is fixed at its front end to the inner surface on
the front side of the resonance box 309, and the speaker back sound is hardly transmitted except
inside the resonance box 309 (closed structure) is there. The speaker front sound is transmitted
to the entire inside of the housing 10 except the inside of the resonance box 309.
[0035]
FIG. 2 is a perspective view showing the appearance of the resonance box 309. The resonance
box 309 has a speaker unit 307 inside, and has a sealed structure except for the portion where
the diaphragm 311 of the speaker 308 at the center of the surface is exposed. Then, speaker
signal input terminals 304 are provided at two corners of the surface.
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[0036]
Next, the flow of voice will be described.
[0037]
An audio signal is input from a signal source (not shown) to a speaker 308 through a speaker
signal input terminal 304 via a signal line on a substrate 303.
The speaker 308 vibrates the diaphragm 311 by the input audio signal, and emits audio to the
front and back sides of the speaker. The sound radiated to the back side is transmitted only to
the inside of the acoustic box 309 connected acoustically, and is not transmitted to others. A nonwoven fabric or the like may be attached to the speaker back surface hole 310 acoustically
connecting the space on the back surface side of the diaphragm 311 and the inside of the
resonance box 309.
[0038]
On the other hand, the sound radiated to the front side is transmitted to the entire inside of the
housing 10 except the inside of the resonance box 309. Then, the sound radiated to the front
side is radiated to the outside from the speaker opening 103 and the leak hole 106. A non-woven
fabric or the like may be attached to the speaker opening 103 or the leak hole 106 in order to
adjust the acoustic impedance or to prevent the entry of foreign matter from the outside.
[0039]
Next, the measurement result of the frequency response characteristic of the mobile telephone
terminal device 100 of the present embodiment is shown.
[0040]
Here, in order to measure the frequency response characteristic, there is a method of using an
ear simulator such as International Telecommunication Union Telecommunication
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Standardization Sector (ITU-T) Type 1 (International Electrotechnical Commission (IEC) 318) and
Type 3.2.
The ear simulator can measure the characteristics that can be heard in the end. In other words,
the frequency response characteristic of the sound that can be heard in the end, even if it is
affected by the gap between the ear and the mobile phone terminal or the structure of the
opening before the radiation sound from the speaker reaches the ear. It can be measured. Type 1
simulates a state in which the ear and the housing are sealed, and Type 3.2 simulates a state in
which there is a gap between the ear and the housing.
[0041]
The Type 3.2 ear simulator simulates the situation where there is a gap between the ear and the
housing, and it includes the effects of characteristic deterioration due to the gap between the ear
and the housing, the structure of the sound emission hole, etc. It is possible to measure the
characteristics and the loudness rating. There are two types of Type 3.2: Low-Leak and HighLeak. The former simulates the case where the gap between the ear and the housing is small, and
the latter simulates the case where the gap between the ear and the housing is large. Also, there
is a difference between the two, such as the outer shape, the acoustic resistance, the resonance
frequency, and the Q value.
[0042]
FIGS. 4 and 5 show examples of measurement results in the case where a leak hole is installed at
the position shown in FIG. 3 performed using Type 3.2 of the above-mentioned ear simulator.
The horizontal axis in FIG. 4 and FIG. 5 is the frequency (Hz), and the vertical axis is the
measured sound volume (dB).
[0043]
FIG. 4 is a graph showing the frequency response characteristic of the low-leak type of Type 3.2.
The response characteristic 401 includes the leak hole 106 in addition to the speaker opening
103 when the speaker opening 103 is provided only. The case where it is provided is shown. The
frequency response characteristic at this time can be said to have an acceptable characteristic.
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However, the response characteristic 402 is compensated to increase the low frequency band of
the input signal level to the speaker. The reason is that, since the acoustic impedance is reduced
by the leak hole 106 and the sound volume is attenuated particularly in the low frequency band,
the band is compensated to obtain an acceptable frequency response characteristic.
[0044]
Next, FIG. 5 is a graph showing the frequency response characteristic of the High-Leak type of
Type 3.2. When the response characteristic 403 is provided only in the speaker opening 103, the
response characteristic 404 is a leak hole in addition to the speaker opening 103. The case
where 106 is provided is shown. As described above, the High-Leak type simulates the case of
large sound leakage. Specifically, sound leakage increases when the user's pressure on the ear is
weak, but this case is simulated. The frequency response characteristics of both the response
characteristic 403 and the response characteristic 404 are worse than those of the response
characteristic 401 and the response characteristic 402, and the balance between the low
frequency range and the high frequency range is significantly degraded. Deterioration is
remarkable particularly in the low frequency band. However, as compared with the response
characteristic 403, the response characteristic 404 is improved so that the balance between the
low frequency band and the high frequency band is balanced, and shows that the characteristic is
more preferable. That is, it can be said that the leak hole 106 reduces the deterioration of the
frequency response characteristic due to the sound leak in the gap between the ear and the
housing.
[0045]
Further, as shown in FIG. 6, the leak hole 106 may be provided on the surface (lower surface)
facing downward when the user puts an ear on the mobile phone terminal 100 at the time of use.
In this case, the leak hole 106 will not be blocked by the hand when grasped as well as the
earlobe and cheeks.
[0046]
The leak hole 106 is not necessarily provided on the side surface or the lower surface of the
mobile phone terminal 100 as shown in FIGS. 3 and 6. It may be provided anywhere on the
mobile phone terminal 100 as long as it can not be blocked by the user's earlobe, cheeks, hands
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or the like. As described above, by providing the leak holes 106 at arbitrary positions, the design
freedom of the mobile phone terminal 100 is increased.
[0047]
Moreover, according to the present embodiment, the overall size can be reduced. This is an
advantageous structure in a mobile phone, which is extremely miniaturized, although the liquid
crystal display, which is a display device, is increasing in size.
[0048]
Although the embodiment described above has described the straight type, the present invention
is not limited to the above embodiment, and various modifications are possible within the scope
of the claims, including the fold type. . That is, embodiments obtained by combining technical
means appropriately modified within the scope of the claims are also included in the technical
scope of the present invention.
[0049]
The speaker device according to the present invention can be applied to a device that is
supposed to be carried, especially a mobile phone terminal that can be put in a small pocket,
because the loudspeaker function and the receiver function can be supported by one speaker,
and further miniaturization can be achieved. it can.
[0050]
1, showing an embodiment of the present invention, is a cross-sectional view showing an internal
structure of a mobile phone terminal.
FIG. 1, showing an embodiment of the present invention, is a perspective view showing an
appearance of a resonance box including a speaker unit. FIG. 1, showing an embodiment of the
present invention, is an overall view showing an appearance of a mobile phone terminal. It is a
figure which shows the telephone frequency response characteristic by ear simulator Low-Leak
type which shows the characteristic of the sound heard to the user's ear at the time of providing
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the leak hole in the embodiment of the present invention. It is a figure which shows the
telephone call frequency response characteristic by an ear simulator High-Leak type which
shows the characteristic of the sound heard to the user's ear at the time of providing the leak
hole in embodiment of this invention. The other embodiment of this invention is shown, and it is
a general view which shows the external appearance of a mobile telephone terminal. It is a
sectional view showing the structure of a leak hole and the separation structure of the front
sound and the back sound of a speaker, showing a prior art. It is a perspective view which shows
a prior art and shows the structure of an acoustic hole.
Explanation of sign
[0051]
Reference Signs List 10 housing (part of speaker device) 100 mobile phone terminal 103 speaker
opening (opening) 104 back housing (part of housing) 105 front housing (remaining part of
housing) 106 leak hole (opening) 307 speaker Unit (part of speaker device) 308 Speaker (part of
speaker device) 309 Resonant box (rear sealed part) (part of speaker device) 310 Speaker back
hole 311 diaphragm
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