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JP2006020184

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DESCRIPTION JP2006020184
The present invention relates to a speaker module, an electronic device and an apparatus used
for audio equipment, and it is an object of the present invention to improve the sound quality of
an acoustically coupled speaker. According to the present invention, a first diaphragm (27) and a
second diaphragm (30) are acoustically coupled to each other as a part of a wall surface
constituting a sealed space (31). By optimizing the volume of the speaker by using the equalizer
33, it is possible to realize improvement in the sound quality of the speaker. [Selected figure]
Figure 1
Speaker, module using the same and electronic device
[0001]
The present invention relates to a speaker, a module using the same, and an electronic device
such as a mobile phone, a communication device, or a game device.
[0002]
The prior art will be described with reference to FIG.
FIG. 5 is a cross-sectional view of a conventional speaker, in which a magnet 21 which is
magnetized is sandwiched between an upper plate 22 and a yoke 23 to constitute an inner
magnetic type magnetic circuit 24. As shown in FIG. The frame 26 is coupled to the yoke 23 of
the magnetic circuit 24. A first diaphragm 27 is attached to the periphery of the frame 26, and
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the voice coil 28 is coupled to the first diaphragm 27, and the voice coil 28 is fitted in the
magnetic gap 25 of the magnetic circuit 24. It is connected. Furthermore, a panel 29 is coupled
to the peripheral portion of the frame 26 of the above-described unit, and a substantially flat
second diaphragm 30 is attached to the panel 29, and the first diaphragm 27 and the second
diaphragm 30 are mounted. Are acoustically coupled by the enclosed space 31 to constitute an
acoustic coupling speaker.
[0003]
As prior art document information related to the invention of this application, for example,
Patent Document 1 is known. Japanese Patent Application Laid-Open No. 2003-179988
[0004]
In the above-described speaker, an air layer partitioned by the first diaphragm 27 and the second
diaphragm 30 acts as a capacitor, and the capacitor absorbs the propagation of sound at a high
frequency, and the high frequency It had the problem of attenuating the sound pressure and
degrading the sound quality.
[0005]
The object of the present invention is to provide a speaker capable of adjusting the volume of air
sandwiched between the first diaphragm 27 and the second diaphragm 30 and reducing the
attenuation of the sound pressure in the high region. I assume.
[0006]
In order to achieve the above object, the present invention has the following configuration.
[0007]
According to the first aspect of the present invention, a frame coupled to a magnetic circuit, a
first diaphragm coupled to an outer peripheral portion of the frame, and a first diaphragm
coupled to the first diaphragm A voice coil partially fitted into the magnetic gap of the magnetic
circuit, a panel coupled to the frame, a space enclosed by the panel combining the first
diaphragm, and a space enclosed by the panel And a equalizer installed in a space surrounded by
the first diaphragm, the panel, and the second diaphragm.
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This configuration provides the effect of improving the sound quality of an acoustically coupled
speaker having two diaphragms.
[0008]
As described above, according to the present invention, the equalizer is installed in the sealed
space between the first diaphragm and the second diaphragm, and after adjusting the volume of
the sealed space, the second diaphragm is used as the first diaphragm. It is acoustically coupled
to the diaphragm with the enclosed space as a medium.
According to this configuration, it is possible to realize the miniaturization of the mobile
telephone device and the improvement of the freedom of the design of the speaker system by
using the large second diaphragm while realizing the improvement of the sound quality.
[0009]
Hereinafter, embodiments of the present invention will be described using the drawings.
[0010]
Embodiment 1 Hereinafter, the inventions according to the first, second, and fourth aspects of
the present invention will be described with reference to the first embodiment.
[0011]
FIG. 1 is a cross-sectional view of a loudspeaker according to an embodiment of the present
invention.
As shown in FIG. 1, the magnetized magnet 21 is sandwiched between the upper plate 22 and the
yoke 23 to form an internal magnetic circuit 24.
The frame 26 is coupled to the yoke 23 of the magnetic circuit 24.
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The outer periphery of the first diaphragm 27 is adhered to the peripheral portion of the frame
26, and one end of the voice coil 28 is coupled to the first diaphragm 27, and the other end of
the voice coil 28 is the magnetic circuit 24. In the magnetic gap 25 of FIG. Furthermore, a panel
29 is coupled to the peripheral edge of the frame 26, and a substantially flat second diaphragm
30 is bonded to the panel 29 to seal the first diaphragm 27 and the second diaphragm 30. The
equalizer 33 is installed in the space 31.
[0012]
With this configuration, the volume of the sealed space 31 between the first diaphragm 27 and
the second diaphragm 30 can be reduced, and the sound quality can be improved.
[0013]
Furthermore, the equalizer 33 is installed in front of the first diaphragm.
In addition, the first diaphragm 27 is configured to be smaller than the second diaphragm 30.
Furthermore, in the case of the present embodiment, the first diaphragm 27 is provided in the
range of the second diaphragm 30 in plan view.
[0014]
With this configuration, the volume of the enclosed space 31 between the first diaphragm 27 and
the second diaphragm 30 can be adjusted, and the sound quality can be improved.
[0015]
Second Embodiment The invention according to the third aspect of the present invention will be
described below with reference to a second embodiment.
[0016]
FIG. 2 is a cross-sectional view of a loudspeaker according to an embodiment of the present
invention.
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The contents shown in FIG. 2 will be described only with respect to parts different from the first
embodiment. The equalizer 33 is provided with one or more sound path parts 32 for acoustically
coupling the first diaphragm 27 and the second diaphragm 30. Are constructed.
With this configuration, the arrangement and the number of the sound path portions 32 can be
adjusted in consideration of the unevenness of the first diaphragm 27, and the sound quality can
be improved.
[0017]
Third Embodiment The invention according to the fifth and sixth aspects of the present invention
will be described below with reference to a third embodiment.
[0018]
Here, the second diaphragm 30 shown in FIGS. 1 and 2 is made of a sheet-like transparent film.
According to this configuration, by designing using the lower space of the sheet-like transparent
film, the lower one of the transparent film can be seen through. Therefore, the components can
be arranged while effectively utilizing not only the lateral direction but also the height direction.
Therefore, even if the large second diaphragm 30 is used, it is possible to realize further
downsizing of the speaker and improvement in the degree of freedom in design.
[0019]
Also, the panel 29 is made of a transparent material. According to this configuration, using the
second diaphragm 30 made of the sheet-like transparent film described above, and by designing
using the lower space of the transparent panel 29, the one under the transparent panel 29 Can
be seen through. Therefore, the components can be arranged while effectively utilizing not only
the lateral direction but also the height direction. Therefore, even if the large second diaphragm
30 and panel 29 are used, it is possible to realize further downsizing, thinning of the speaker,
and improvement in the freedom of design.
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[0020]
Fourth Embodiment The invention according to the seventh aspect of the present invention will
be described below with reference to the fourth embodiment.
[0021]
FIG. 3 is a cross-sectional view of a speaker module according to an embodiment of the present
invention.
FIG. 3 shows a speaker module including at least a display unit 41 and a speaker 40. The second
diaphragm 30 of the above-described speaker is mounted on the front surface of the display unit
41 so as to cover the display unit 41. A speaker module 50.
[0022]
At this time, the second diaphragm 30 is made of a transparent film sheet, and the panel 29 is
made of a transparent material. As a result, by setting the display unit 41 in the space under the
transparent film sheet and panel and modularizing it, the transparent film and the underside of
the film can be seen through.
[0023]
Furthermore, by modularizing in this manner, it is possible to achieve process reduction at the
time of set production and rationalization at the component distribution stage, and cost reduction
can also be realized.
[0024]
Fifth Embodiment The fifth embodiment of the present invention will be described in the
following.
[0025]
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FIG. 4 is a cross-sectional view of an essential part of a mobile telephone device equipped with
the speaker module according to an embodiment of the present invention.
FIG. 4 shows a portable telephone apparatus 51 constituted by a speaker module 50 comprising
at least a display unit 41 and a speaker 40 and an operation unit 42.
[0026]
The portable telephone apparatus 51 is configured using the speaker module 50 described in the
fourth embodiment, the speaker module 50 is coupled to the outer case 52, the operation unit 42
is coupled to the side thereof, Is configured.
As a result, the display unit 41 is set in the lower space of the sheet-like transparent film, and the
operation unit 42 is set to the side of the display unit 41 to realize better frequency
characteristics and miniaturize the mobile telephone device 51. , Can improve the freedom of
design.
[0027]
In addition, it is possible to set both the display unit 41 and the operation unit 42 in the lower
space of the sheet-like transparent film, and it is possible to realize further downsizing of the
mobile phone device 51 and improvement in design freedom. Become.
[0028]
The speaker and the module according to the present invention can emit sound from the display
unit by using a transparent film or a transparent panel in addition to the function of producing
sound, and can be applied to audiovisual equipment.
[0029]
Cross-sectional view of a speaker according to an embodiment of the present invention Crosssectional view of a speaker according to an embodiment of the present invention cross-sectional
view of a speaker module according to an embodiment of the present invention Cross-sectional
view of a main part of a mobile telephone device
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Explanation of sign
[0030]
Reference Signs List 21 magnet 22 upper plate 23 yoke 24 magnetic circuit 25 magnetic gap 26
frame 27 first diaphragm 28 voice coil 29 panel 30 second diaphragm 31 sealed space 32 sound
path section 33 equalizer 40 speaker 41 display section 42 operation section 50 Speaker module
51 Mobile telephone device 52 Exterior case
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