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DESCRIPTION JP2008278146

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DESCRIPTION JP2008278146
The present invention provides a speaker device and a portable device capable of preventing
water leakage of a speaker itself, thereby improving the sound quality and increasing the volume
while improving the waterproof function. SOLUTION: A speaker body 10 having a voice coil 10a,
a cylindrical frame 12 formed so as to surround the periphery of the speaker body, and a
peripheral portion 13c are fixed to an end face of the cylindrical frame to cover the front surface
of the speaker body A protector 13, a waterproof diaphragm 14 in which a peripheral edge 14 c
is sandwiched and fixed between an end face of the cylindrical frame and the protector, and an
end face of the cylindrical frame are formed with lead wires 11 of the voice coil. It has a slit 12b
for pulling out of the cylindrical frame, and a plate 15 disposed between the diaphragm and the
end face of the cylindrical frame to close the slit. [Selected figure] Figure 1
Speaker apparatus and portable device
[0001]
The present invention relates to, for example, the technology of a suitable speaker apparatus
equipped with a portable device that requires waterproofing, such as a portable telephone, and a
portable device incorporating the same.
[0002]
Electronic devices that are often used outdoors, such as mobile phones, are waterproofed so that
they can be used even when it is raining.
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1
In particular, in the sound passing portion, a hole for sound passing from the speaker is provided,
and a waterproof structure is independently adopted for the sound passing portion.
[0003]
For example, as shown in Patent Document 1, as a waterproofing of a sound passing portion
having a speaker, a film such as a waterproof film that does not transmit water is provided on the
front of the speaker to prevent water from entering the inside of the mobile phone. Japanese
Patent Application Laid-Open No. 8-79865
[0004]
In the mobile phone as shown in Patent Document 1, acoustic resistance is present on the front
of the speaker, so there is a problem that an obstacle such as acoustic distortion is likely to occur.
In particular, when a highly airtight waterproof sheet is used, there is a problem that the speaker
sound from the inside does not easily pass outside and a predetermined sound pressure can not
be obtained. In addition, when the sound pressure of the speaker is increased in order to increase
the sound volume, there is a problem that the waterproof sheet clings and the sound quality is
deteriorated.
[0005]
Moreover, in patent document 1, since a waterproof sheet is provided in the state which covers
the opening part of a speaker, there existed a problem which can not prevent the water leak of a
speaker main body. That is, when the function of the waterproof sheet is lowered, there is a
problem that water intruding through the waterproof sheet intrudes into the inside of the
speaker body or into the device.
[0006]
Therefore, an object of the present invention is to provide a speaker device and a portable device
capable of improving the sound quality and increasing the sound volume while improving the
waterproof function while eliminating the need for a waterproof film as a structure for
preventing water leakage of the speaker itself. It is.
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2
[0007]
In order to solve the above problems, the speaker device of the invention according to claim 1
includes: a speaker body having a voice coil; a cylindrical frame formed so as to surround the
periphery of the speaker body; and an end face of the cylindrical frame And a waterproof
diaphragm in which the peripheral portion is sandwiched and fixed between the end face of the
cylindrical frame and the protector, and the cylindrical frame. A slit formed on an end surface for
drawing the lead wire of the voice coil out of the cylindrical frame; and a plate disposed between
the diaphragm and the end surface of the cylindrical frame to close the slit. It is characterized by
[0008]
The invention according to claim 2 is the speaker device according to claim 1, wherein the end
face of the cylindrical frame is formed in a ring shape with a flat surface, and the plate has an
annular shape corresponding to the end face shape of the cylindrical frame. It is characterized in
that it is formed.
[0009]
The invention according to claim 3 is characterized in that, in the speaker device according to
claim 1, the protector and the diaphragm are adhered via a double-sided tape disposed between
the protector and the diaphragm. Do.
[0010]
The invention according to claim 4 is characterized in that, in the speaker device according to
claim 1, an O-ring for maintaining airtightness is provided between the peripheral portion of the
protector and the peripheral portion of the diaphragm. Do.
[0011]
The invention according to claim 5 is the speaker device according to claim 4, wherein a side
surface case forming a part of the case is disposed on the outer peripheral surface side of the
peripheral portion of the protector, and the outer peripheral portion of the O ring is the side
surface It adheres to the inner surface of the case.
[0012]
The invention according to claim 6 is the speaker device according to any one of claims 1 to 5,
wherein a case to which a protector of the speaker body is fixed, and a peripheral portion of the
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protector and the case are provided. The waterproof cushioning material is further characterized
in that the waterproof cushioning material is formed in a thickness having a gap between the
protector and the case.
[0013]
A portable device of the invention according to claim 7 is characterized in that the speaker
apparatus according to any one of claims 1 to 6 is mounted.
[0014]
According to the present invention, it is possible to eliminate the need for a waterproof film as a
structure for preventing water leakage of the speaker itself, and thereby it is possible to
significantly improve the waterproof function while improving the sound quality and increasing
the volume.
[0015]
Hereinafter, the best mode for carrying out the present invention will be described in detail with
reference to the drawings.
Embodiment 1 FIG. 1 is a cross-sectional view of a speaker device to which the present invention
is applied.
FIG. 2 is a partial enlarged view of FIG.
FIG. 3 is a partially enlarged exploded view of FIG.
FIG. 4 is an enlarged view of a portion C in FIG.
[0016]
As shown in these figures, the speaker device S has a speaker main body 10 having a voice coil
10a, a cylindrical frame 12 formed so as to surround the periphery of the speaker main body 10,
and an end face 12a of the cylindrical frame 12 A protector 13 covering the front surface of the
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speaker body 10 with the portion 13c fixed, and a waterproof diaphragm 14 in which the
peripheral edge portion 14c is sandwiched and fixed between the end face 12a of the cylindrical
frame 12 and the protector 13; Slits 12b (see FIGS. 3 and 4) formed on the end face 12a of the
cylindrical frame 12 for drawing the lead wire 11 of the voice coil 10a out of the cylindrical
frame 12, and the end face 12a of the cylindrical frame 12 and vibration And a plate 15 disposed
between the plate 14 and closing the slit 12b.
[0017]
The speaker body 10 includes a yoke 10b sized to fit in the cylindrical frame 12, a magnet 10c
disposed in a central space portion of the yoke 10b, and the voice coil 10a disposed on an outer
peripheral portion of the magnet 10c.
The cylindrical frame 12 is formed in a cylindrical shape, and is formed such that the outer
peripheral surface of the yoke 10b is in close contact with the inner peripheral surface thereof.
The end face 12a of the cylindrical frame 12 is formed in a ring shape with a flat surface.
[0018]
The protector 13 is for protecting the front side of the speaker main body 10 where the
diaphragm 14 is present, and includes a protector main body 13 b in which a large number of
sound transmission holes 13 a are formed, and a peripheral portion 13 c.
The protector main body 13b is circular in plan view, and the peripheral edge 13c is formed in
an annular shape (ring shape).
The peripheral portion 13c is formed thicker than the protector main body 13b.
In this case, the peripheral portion 13c is prevented from being easily deformed, so that in
addition to the holding function of the peripheral portion 13c, the close contact function to the
diaphragm 14 can be simultaneously exhibited.
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[0019]
The diaphragm 14 is made of a waterproof material per se or a material waterproofed by a paint,
a waterproof film or the like, and the main body 14b having the center cap 14a at the center and
the peripheral edge 14c Have.
The main body portion 14 b and the center cap 14 a are both formed in a circular shape in plan
view, and the peripheral portion 14 c is formed in an annular shape (ring shape).
[0020]
The end face 12 a of the cylindrical frame 12 is provided with a slit 12 b for drawing the lead
wire 11 of the voice coil 10 a to the outside of the cylindrical frame 12. In this embodiment, the
slits 12b extend in the radial direction of the tubular frame 12 along the end face 12a, and
further along the outer peripheral surface of the tubular frame 12 from the end face 12a (in the
height direction of the tubular frame Extended). Therefore, the lead wire 11 also extends along
the slit 12 b and is connected to the lower electrode 17.
[0021]
Further, as described above, the speaker device S is provided with the plate 15 disposed between
the diaphragm 14 and the end face 12 a of the cylindrical frame 12 and closing the slit 12 b. The
end face 12a of the cylindrical frame 12 is formed in a ring shape with a flat surface. The plate
15 is formed of a resin such as PET (polyethylene terephthalate) and is formed in an annular
(ring shape) corresponding to the end surface shape of the cylindrical frame 12.
[0022]
The plate 15 is inserted between the end face 12a of the cylindrical frame 12 and the peripheral
part 13c of the protector 13 and the peripheral part 14c of the diaphragm 14 to uniformly
correct the plane, and the front and back surfaces The lower surface) is formed to be flat.
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[0023]
The plate 15 is formed in an annular shape corresponding to the shape of the end face 12 a of
the cylindrical frame 12 formed in a ring shape with a flat surface.
Therefore, the entire end face 12 a of the cylindrical plate 12 is uniformly covered by the plate
15. As a result, the peripheral portion 14c of the diaphragm 14 can be uniformly adhered and
fixed to the upper surface of the plate 15 covering the slits 12b.
[0024]
The protector 13 and the diaphragm 14 are bonded via a double-sided tape 16 disposed between
the protector 13 and the diaphragm 14. Although a seal using an adhesive may be used, in that
case, it is difficult to bond without a circumferential gap. Therefore, water leakage can be
effectively prevented by bonding using double-sided tape in this manner.
[0025]
In this embodiment, the speaker device S is, in this embodiment, between a storage case (a part
of a housing of a portable device) 20 to which the protector 13 covering the speaker main body
10 is fixed, and a peripheral portion 13c of the protector 13 And a waterproof cushion member
21 provided on the The waterproof cushion material 21 is formed in a thickness having a gap α
between the protector 13 and the storage case 20. Therefore, while being able to prevent the
water leak between the storage case 20 and the protector 13, it can be considered that the
surface of the protector 13 does not contact the storage case 20.
[0026]
The plate 15, the peripheral portion 14c of the diaphragm 14, the double-sided tape 16, and the
peripheral portion 13c of the protector 13 are integrated by fixing including adhesion on the end
face 12a of the cylindrical frame 12 in this order. In addition, waterproofing between the housing
case 20 and the speaker main body 10 can be made to function by compressing the waterproof
cushion material 21 provided between the peripheral portion 13 c of the protector 13 and the
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inner surface of the housing case 20. it can.
[0027]
According to this embodiment, a plate 15 for plane correction is provided between the end face
12a of the cylindrical frame 12 and the peripheral portion 13c of the protector 13, and between
the plate 15 and the protector 13 (peripheral portion 13c) Since the diaphragm 14 (peripheral
portion 14c) is sandwiched, the diaphragm 14 and the protector 13 can be brought into close
contact with each other. Thereby, the water leak of the form shown by the arrow A which is easy
to produce between the diaphragm 14 and the protector 13 can be prevented reliably.
[0028]
Further, since the diaphragm 14 and the protector 13 are adhered by the double-sided tape 16
so as to be in close contact with each other and held by the annular flat plate 15, the adhesion
does not loosen and leak water even if air pressure is applied.
[0029]
7 is a cross-sectional view similar to FIG. 1 shown as a comparative example, FIG. 8 is a partially
enlarged view thereof, and FIG. 9 is a partially enlarged exploded view.
The differences, the effects and the like of the first embodiment will be described in more detail
with reference to FIGS. 7 to 9. In these figures, the same components as in the first embodiment
will be denoted by the same reference numerals to simplify the description.
[0030]
The speaker device S shown in this comparative example also has the speaker body 10 having
the voice coil 10a, the cylindrical frame 12 formed so as to surround the periphery of the
speaker body 10, and the peripheral portion 13c on the end face 12a of the cylindrical frame 12.
A protector 13 which is fixed and covers the front surface of the speaker body 10, a waterproof
diaphragm 14 whose peripheral edge 14c is sandwiched and fixed between the end face 12a of
the cylindrical frame 12 and the protector 13, and a cylindrical frame A slit 12 b is formed on the
end face 12 a of the T.12 and is for drawing the lead wire 11 of the voice coil 10 a out of the
cylindrical frame 12.
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[0031]
Therefore, in this comparative example, the plate 15 for plane correction which is disposed
between the diaphragm 14 and the end face 12 a of the cylindrical frame 12 and closes the slit
12 b is not provided.
Therefore, the adhesion between the diaphragm 14 and the protector 13 is not sufficient, and
there is a possibility that a water leak may occur as indicated by the arrow B.
[0032]
This water leak is caused by the slit 12b. That is, the slit 12b present in the end face 12a portion
of the cylindrical frame 12 forms a gap corresponding to the groove width of the slit 12b
between the slit 12b and the lower surface of the diaphragm 14 superimposed thereon.
Therefore, a part of the diaphragm 14 is easily bent so as to be bent inward of the slit 12 b, that
is, a depression is easily formed on the upper surface of the diaphragm 14. Thereby, the
adhesion between the diaphragm 14 and the protector 13 is reduced, and the water leakage B is
easily generated. This phenomenon is due to the vibration of the diaphragm 14 itself and the
thinness thereof in addition to the presence of the slits 12b.
[0033]
In this respect, in the first embodiment, since the diaphragm 14 is sandwiched between the flat
plate 15 for plane correction and the protector 13 (peripheral portion 13c), the diaphragm 14
and the protector 13 are in close contact with each other. In addition, since the plate 15 is
present below the diaphragm 14, even if the slit 12b is present therebelow, the plate is not
affected. This makes it possible to reliably prevent water leakage in the form shown by the arrow
A which is likely to occur between the diaphragm 14 and the protector 13.
[0034]
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9
Second Embodiment FIG. 5 is a cross-sectional view of a main part showing a second
embodiment of the present invention. In the second embodiment, an O-ring 30 is provided on the
end face 12a of the cylindrical frame 12 between the peripheral portion 13c of the protector 13
and the peripheral portion 14c of the diaphragm 14 to maintain airtightness. It is. In this case, a
groove 13d is formed on the lower surface of the peripheral portion 13c of the protector 13 for
positioning the O-ring 30, and the O-ring 30 is inserted into the groove 13d. Of course, the
groove 13 d is also formed in a ring shape that makes a round along the end face 12 a
corresponding to the O-ring 30.
[0035]
When the O-ring is used instead of the double-sided adhesive tape 16 as described above, the Oring 30 is compressed by the protector 13 and the plate 15 by forming the O-ring 30 with an
elastic material. Can be an effective means to ensure airtightness so as to adhere tightly.
[0036]
Third Embodiment FIG. 6 is a cross-sectional view of the main parts showing a third embodiment
of the present invention.
In the third embodiment, between the peripheral portion 13c of the protector 13 and the
peripheral portion 14c of the diaphragm 14 on the end surface 12a of the cylindrical frame 12,
and with the inner surface of the side surface case 19 of a part of the storage case 20. The
configuration is such that an O-ring 30 is provided to maintain airtightness. Also in this case, for
positioning the O-ring 30, a groove 13d is formed at the boundary between the lower surface of
the peripheral portion 13c of the protector 13 and the outer peripheral surface, and the O-ring
30 is inserted into the groove 13d.
[0037]
When configured in this manner, the outer peripheral portion of the O-ring 30 can be brought
into close contact with the inner surface of the side case 19 by forming the O-ring 30 with an
elastic material. Therefore, the O-ring 30 can be strongly adhered to any of the protector 13, the
diaphragm 14 and the side case 19 by utilizing the entire O-ring 30. Thereby, it can be set as an
effective airtight ensuring means which does not produce a water leak.
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[0038]
In the above embodiments, the present invention is applied to a speaker device employed in a
portable telephone or the like. However, the present invention can be applied to a speaker device
of another electronic device such as a PDA. Further, although the front shape of the speaker
device is circular, it may be square. Besides, it is needless to say that the specific detail structure
and the like can be appropriately changed.
[0039]
It is a sectional view of a speaker device concerning Embodiment 1 of the present invention. It is
the elements on larger scale of FIG. FIG. 2 is a partially enlarged exploded view of FIG. 1; FIG. 4 is
an enlarged view of a portion C in FIG. It is sectional drawing of the principal part of the speaker
apparatus based on Embodiment 2 of this invention. It is sectional drawing of the principal part
of the speaker apparatus based on Embodiment 3 of this invention. It is sectional drawing of the
speaker apparatus shown as a comparative example of embodiment. 8 is a partial enlarged
exploded view of FIG. 7 which is a partial enlarged view of FIG. 7
Explanation of sign
[0040]
DESCRIPTION OF REFERENCE NUMERALS 10 speaker body 10a voice coil 10b yoke 10c bobbin
11 lead wire 12 cylindrical frame 12a end face 12b slit 13 protector 13a sound transmission
hole 13b protector body 13c peripheral portion 13d groove 14 diaphragm 14c peripheral
portion 15 plate 16 double-sided tape 17 electrode 19 side surface Case 20 Case 21 Waterproof
cushioning material 30 O-ring
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