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JP2016208284

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DESCRIPTION JP2016208284
Abstract: The object of the present invention is to provide a loudspeaker with low distortion.
According to the present invention, a first recess 41 is formed in a box 22 in order to solve this
problem. The first recess 41 includes a bottom 41A, a first inner wall 41B, a second inner wall
41C, and a through hole 41D. The first inner wall surface 41B is formed to stand on the
peripheral edge portion of the bottom portion 41A. The second inner wall surface 41C is
provided to face the first inner wall surface 41B. The through hole 41D is formed to extend from
the bottom 41A to the second inner wall surface 41C. The cable 24 passes through the through
hole 41D and is pulled out of the box 22 to the outside of the box 22. Furthermore, the first
sealing resin 25 is formed of a resin filled in the first recess 41, and covers the through hole 41D.
With this configuration, the gap between the cable 24 and the through hole 41D can be reduced,
and the through hole 41D can be covered with the first sealing resin 25. [Selected figure] Figure
7A.
ラウドスピーカ
[0001]
The present invention relates to a loudspeaker in which a speaker unit is housed in a box.
[0002]
Hereinafter, a conventional loudspeaker will be described.
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1
A conventional loudspeaker comprises a hollow box, a loudspeaker unit and a cable. The speaker
unit is housed in a box. The box is composed of an upper case and a lower case. A gap is formed
in part of the connection between the upper case and the lower case. The cable includes a first
end and a second end. The first end is disposed in the box and electrically connected to the
speaker unit. On the other hand, the second end is disposed outside the box. The cable is drawn
from the inside of the box to the outside of the box through the gap. Then, the sealing resin is
filled in the gap.
[0003]
As prior art document information related to the invention of this application, for example,
Patent Document 1 is known.
[0004]
China Utility Model No. 203618121 Specification
[0005]
However, in conventional loudspeakers, the sealing resin does not stay in the gap but penetrates
into the interior of the box.
In this case, a part of the gap is exposed without being covered with the sealing resin.
That is, the space inside the box is not sealed. As a result, air passes through a portion of the gap
that is not blocked by the sealing resin. Therefore, it has the subject that distortion of the sound
output from a loudspeaker by this passage of air increases.
[0006]
Therefore, the present invention solves this problem, and an object thereof is to reduce distortion
of sound output from a loudspeaker.
[0007]
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2
To achieve this purpose, the loudspeaker comprises a box, a loudspeaker unit, a cable and a first
seal.
The speaker unit is housed in a box. A first recess is formed in the box. The first recess includes a
bottom, a first inner wall, a second inner wall, and a through hole. The first inner wall surface is
formed to stand on the periphery of the bottom. The second inner wall surface is provided to face
the first inner wall surface. The cable includes a first end and a second end. The first end is
disposed in the box and electrically connected to the speaker unit. On the other hand, the second
end is disposed outside the box.
[0008]
In the above configuration, the through hole is formed extending from the bottom surface to the
second wall surface. The cable passes through the through hole and is pulled out of the box to
the outside of the box. Furthermore, the first sealing portion is configured to be filled in the first
recess to cover the through hole. With this configuration, the intended purpose can be achieved.
[0009]
As described above, according to the present invention, the through hole is formed extending
from the bottom surface to the second wall surface. That is, the through holes are bite holes. This
configuration can reduce the gap between the cable and the through hole. Therefore, since the
through hole can be covered by the first sealing portion, air inside the box can be suppressed
from passing through the through hole. As a result, distortion of the sound output from the
loudspeaker can be reduced.
[0010]
The perspective view of the loudspeaker in the embodiment of the present invention The top
view of the loudspeaker in the embodiment of the present invention The back view of the
loudspeaker in the embodiment of the present invention The side view of the loudspeaker in the
embodiment of the present invention Sectional view of a loudspeaker according to an
embodiment of the present invention Sectional view of a loudspeaker according to an
embodiment of the present invention An enlarged sectional view of the principal part of a
loudspeaker according to an embodiment of the present invention Cross-sectional view The main
part enlarged sectional view of the loudspeaker in the embodiment of the present invention The
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principal part enlarged view of the loudspeaker in the embodiment of the present invention
[0011]
Prior to the description of the present embodiment, requirements required for loudspeakers will
be described.
Loudspeakers are mounted on, for example, tablet terminals and portable electronic devices
represented by smart phones. 2. Description of the Related Art In recent years, the size of a
display such as liquid crystal mounted on a portable electronic device has been increasing. In
addition, the resolution of video and the like are also improved by digitizing the video signal.
Therefore, the user of the portable electronic device can view beautiful and powerful images on
the portable electronic device. Therefore, there has been a demand for users to view motion
pictures full of sense of presence even in portable electronic devices. Therefore, in order to
respond to the desire, it is also required that the loudspeaker mounted in such a portable
electronic device be able to reproduce a beautiful sound with a small distortion.
[0012]
The loudspeaker according to the present embodiment will be described below.
[0013]
First Embodiment A loudspeaker 21 according to the present embodiment will be described
below with reference to the drawings.
FIG. 1 is a perspective view of the loudspeaker 21. FIG. FIG. 2 is a top view of the loudspeaker 21.
As shown in FIG. FIG. 3 is a rear view of the loudspeaker 21. As shown in FIG. FIG. 4 is a side
view of the loudspeaker 21. As shown in FIG. 5 and 6 are cross-sectional views of the
loudspeaker 21. FIG. FIG. 5 shows the loudspeaker 21 cut along the section line 5-5 in FIG. 6
shows a state in which the loudspeaker 21 is cut along the section line 6-6 in FIG.
[0014]
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The loudspeaker 21 includes a box 22, a speaker unit 23, a cable 24, and a first sealing resin 25.
The speaker unit 23 is housed in the box 22. A first recess 41 is formed in the box 22. The cable
24 includes a first end 24A and a second end 24B. The first end 24A is disposed in the box 22.
The cable 24 is electrically connected to the speaker unit 23 at the first end 24A. On the other
hand, the second end 24 B is disposed outside the box 22.
[0015]
7A, 7B and 7C are enlarged cross-sectional views of the first recess 41 in the loudspeaker 21.
FIG. FIG. 8 is an enlarged view of the first recess 41 in the loudspeaker 21. As shown in FIG. FIG.
7A shows a state in which the cable 24 is inserted into the first recess 41. 7B shows a state in
which the cable 24 is not inserted into the first recess 41. Further, FIG. 7C shows a state in which
the cable 24 is inserted into the first recess 41 and the first sealing resin 25 and the second
sealing resin 26 are filled. The first recess 41 includes a bottom 41A, a first inner wall 41B, a
second inner wall 41C, and a through hole 41D. The first inner wall surface 41B is formed to
stand on the peripheral edge portion of the bottom portion 41A. The second inner wall surface
41C is provided to face the first inner wall surface 41B.
[0016]
The through hole 41D is formed to extend from the bottom 41A to the second inner wall surface
41C. The cable 24 passes through the through hole 41D and is pulled out of the box 22 to the
outside of the box 22. Furthermore, the first sealing resin 25 is formed of the resin filled in the
first concave portion 41, and covers the through hole 41D.
[0017]
With the above-described configuration, the through hole 41D can be formed as a through hole,
so the gap between the cable 24 and the through hole 41D can be reduced. Therefore, since the
through hole 41D can be covered with the first sealing resin 25, air in the box 22 can be
suppressed from passing through the through hole 41D. As a result, distortion of the sound
output from the loudspeaker 21 can be reduced.
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[0018]
Hereinafter, the loudspeaker 21 of the present embodiment will be described in more detail. As
shown in FIG. 5, the box 22 includes a front case 22A, a back case 22B, and a welded portion
22C. The box 22 also includes a front surface 22D, a back surface 22E, and a side surface 22F. In
the box 22, the back surface 22E is formed opposite to the front surface 22D. The front case 22A
includes a front portion 22D. Further, the front case 22A includes a sound emission hole 22G. On
the other hand, the back case 22B includes the back portion 22E. The sound emission hole 22G
can emit the sound output from the speaker unit 23. For that purpose, the loudspeaker 21 is
attached to the front part 22D.
[0019]
The box 22 includes a weld 22C. The front case 22A and the back case 22B are joined by a weld
22C. Front case 22A and back case 22B can be joined, for example, by ultrasonic welding. The
front case 22A and the back case 22B are not limited to the structure joined by ultrasonic
welding, and may be joined by various welding methods such as thermal welding. Further, the
welded portion 22C is provided on the side surface 22F.
[0020]
In the above configuration, it is preferable that the first recess 41 be provided in the front
surface portion 22D or the back surface portion 22E. With this configuration, even if a
thermoplastic material is used for the base material of the cable 24, the insulating film, and the
first sealing resin 25, the base material of the cable 24 due to heat due to welding, the insulating
film, or the first seal Melting of the stop resin 25 can be suppressed. Therefore, it can be
suppressed that the through holes 41D are exposed from the first sealing resin 25.
[0021]
スピーカユニット23は、いわゆるマイクロスピーカである。 The front surface of the speaker
unit 23 is in contact with the front surface portion 22D. On the other hand, the speaker unit 23
includes a terminal 23A on the side facing the back surface 22E. The speaker unit 23 is
electrically connected to the cable 24 via the terminal 23A. The terminal 23A is preferably an
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elastic body. By this configuration, the terminal 23A is pressed against the cable 24 and is in
contact with it. Furthermore, the front surface of the speaker unit 23 is pressed against the inner
surface of the front surface portion 22D.
[0022]
In this case, the cable 24 is preferably in the form of a flexible flat plate. The cable 24 can use,
for example, a flexible substrate or a flat cable.
[0023]
As shown to FIG. 7B, it is preferable that the box 22 contains the 2nd recessed part 51. As shown
in FIG. The second recess 51 is provided opposite to the first recess 41. For example, when the
first recess 41 is formed on the outer surface of the box 22, the second recess 51 is formed on
the inner surface of the box 22. The first recess 41 is not limited to the configuration formed on
the outer surface of the box 22, and may be formed on the inner surface of the box 22. However,
in this case, the second recess 51 is formed on the outer surface of the box 22.
[0024]
The second recess 51 includes a third inner wall surface 51A and a second bottom. The third
inner wall surface 51A is formed to face the side surface 41E of the through hole 41D in the
bottom portion 41A. The second bottom 51B is formed to connect the end of the third inner wall
51A and the second inner wall 41C. The second sealing resin 26 is filled in the second recess 51.
The second sealing resin 26 covers the through hole 41D. With this configuration, both the first
recess 41 and the second recess 51 can be sealed with the through hole 41D interposed
therebetween. Therefore, since the through holes 41D can be covered with the first sealing resin
25 and the second sealing resin 26, it is possible to further suppress the air inside the box 22
from passing through the through holes 41D.
[0025]
The cable 24 includes a first surface 24C and a second surface 24D. The second surface 24D is
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formed opposite to the first surface 24C. The first surface 24C is preferably disposed along the
second inner wall surface 41C. With this configuration, the gap between the first surface 24C
and the second inner wall surface 41C can be reduced. Therefore, it can suppress that air passes
between the 1st field 24C and the 2nd inner wall surface 41C. Moreover, it is preferable that 2nd
surface 24D is arrange ¦ positioned along side 41E of through-hole 41D in bottom 41A. By this
configuration, the gap between the second surface 24D and the side surface 41E can be reduced.
Moreover, it can suppress that the 1st sealing resin 25 flows in to the inside of the box 22 from
through-hole 41D. Therefore, it can suppress that air passes between the 1st surface 24C and
side 41E of penetration hole 41D.
[0026]
Furthermore, preferably, the first surface 24C is in contact with the second inner wall surface
41C. Therefore, the second inner wall surface 41C is preferably chamfered. The chamfering may
be C face or R face. And by this composition, a crevice between the 1st field 24C and the 2nd
inner wall surface 41C can be made small. Therefore, it can suppress that air passes between the
1st field 24C and the 2nd inner wall surface 41C.
[0027]
The second surface 24D is preferably in contact with the side surface 41E of the through hole
41D in the bottom 41A. By this configuration, the gap between the second surface 24D and the
side surface 41E can be reduced. Moreover, it can suppress that the 1st sealing resin 25 flows in
to the inside of the box 22 from through-hole 41D. Therefore, it can suppress that air passes
between the 1st surface 24C and side 41E of penetration hole 41D.
[0028]
The cable 24 preferably includes a locking portion 24E at the first end 24A. The locking portion
24E is not limited to the configuration formed at the first end 24A, but may be formed at the
second end 24B. Furthermore, the locking portion 24E may be formed on both the first end 24A
and the second end 24B. In this case, the box 22 includes the positioning portion 22H. The
positioning portion 22H is engaged with the locking portion 24E, whereby the cable 24 can be
held at a predetermined position. Therefore, the first surface 24C can be disposed along the
second inner wall surface 41C. Further, the second surface 24D can be disposed along the side
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surface 41E of the through hole 41D. Furthermore, the state in which the first surface 24C is in
contact with the second inner wall surface 41C can be maintained. Furthermore, the second
surface 24D can be maintained in contact with the side surface 41E of the through hole 41D.
[0029]
Positioning portion 22H is, for example, a protrusion. The positioning portion 22H is preferably
formed integrally with the box 22. In this case, the locking portion 24E is, for example, a hole or
a notch. The positioning portion 22H is not limited to the structure integrally formed with the
box 22, and the positioning portion 22H and the box 22 may be separately formed. Furthermore,
the positioning portion 22H may be configured to hold the cable 24 by caulking the positioning
portion 22H. Alternatively, the positioning portion 22H may be made of a thermoplastic resin,
and part of the positioning portion 22H may be melted by heat or the like to hold the cable 24.
[0030]
The cable 24 is preferably fixed to the box 22. With this configuration, it is possible to suppress
the cable 24 from falling off even when the second end 24B of the cable 24 is pulled. For that
purpose, it is preferable to provide an adhesive layer or an adhesive layer between the cable 24
and the inner surface of the box 22. The cable 24 and the inner surface of the box 22 are not
limited to the bonded structure, and may be fixed by an adhesive layer. Further, the adhesive
layer or the adhesive layer is not limited to the configuration provided between the cable 24 and
the outer surface of the box 22, but may be provided between the cable 24 and the outer surface
of the box 22.
[0031]
The loudspeaker according to the present invention has the effect of reducing distortion of the
sound to be output, and is useful when used in various audio equipment and the like.
[0032]
21 Loudspeaker 22 Box 22A Front Case 22B Back Case 22C Welded Part 22D Front Part 22E
Back Part 22E Back Part 22F Side 22G Sound Output Hole 22H Positioning Part 23 Speaker Unit
23A Terminal 24 Cable 24A First End 24B Second End 24C Surface 24D Second surface 24E
Locking portion 25 First sealing resin 26 Second sealing resin 41 First concave portion 41A
Bottom portion 41B First inner wall surface 41C Second inner wall surface 41D Through hole
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41E Side surface 51 second concave portion 51A Third inner Wall 51 B second bottom
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