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DESCRIPTION JP2007060725

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DESCRIPTION JP2007060725
[PROBLEMS] To provide a speaker that is waterproof and highly productive. SOLUTION: A
magnetic circuit 4 held by a frame 6, a diaphragm 7 which couples a voice coil 8 and is coupled
to an outer peripheral portion of the frame 6, and a vent which is disposed on a front portion of
the diaphragm 7 and covers the voice coil 8. In a speaker having a dust cap 18 having sound
permeability, the dust cap 18 is subjected to water repellent finish treatment with a fluorine resin
on both sides of a cloth made of polyester fiber, and only one side thereof is sputter-etched or
corona discharge treatment Adhesion improvement is performed by adhesion improvement with
a fluorine reduction rate of 4 to 54% and an oxygen increase rate of 14 to 143% by the adhesive
property of 500 g / 19 mm or more is ensured, and the surface modification It is coupled to the
diaphragm 7 or the voice coil 8 in the above plane. [Selected figure] Figure 1
スピーカ
[0001]
The present invention relates to a speaker used for audio equipment and information
communication equipment.
[0002]
FIG. 2 shows a cross section of a waterproof speaker used in a mobile phone.
In this speaker, the magnet 1 is sandwiched between the upper plate 2 and the yoke 3 to form an
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internal magnetic circuit 4, the frame 6 is coupled to the outer peripheral portion of the yoke 3,
and the diaphragm 7 is the outer peripheral edge of the frame 6 The voice coil 8 for driving the
diaphragm 7 is coupled to the diaphragm 7 so as to be fitted into the magnetic gap 10 of the
magnetic circuit 4 while being supported by the rising portion 6a of the portion and disposed
above the magnetic circuit 4. There is. Further, a protector 11 for covering the diaphragm 7 with
an appropriate gap is provided by bonding to the rising portion 6 a of the frame 6, and a water
repellent net 12 having air permeability and sound permeability is provided to cover the
protector 11.
[0003]
The water repellent net 12 is obtained by applying a water repellent finish by a fluorine-based
resin to a net substrate obtained by subjecting a material such as a resin or a natural fiber to
knitting processing or the like. Such a water repellent net 12 is particularly used to prevent water
from entering the electric / electronic parts set in the housing from the outside.
[0004]
By the way, since the water repellent net 12 used in the conventional speaker is subjected to
water repellent finish with the fluorine-based resin as described above, the adhesive does not
adapt and bonding by adhesion is difficult. The poor adhesion of fluorine resins is well known.
[0005]
Therefore, when bonding the water repellent net 12 to the frame 6, the protector 11 is bonded to
the frame 6 by using the gasket 13 made of resin (if there is no protector, the diaphragm 7) The
other surface is heat-melted to be used for bonding the water repellent net 12. However, there is
a problem that not only the gasket 13 made of resin is essential but also a very time-consuming
process of heat welding equipment and heat welding is required.
[0006]
The present invention solves the above-mentioned problems, and an object of the present
invention is to provide a speaker which is waterproof and highly productive.
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[0007]
In order to solve the above-mentioned problems, the present invention is to use a water repellent
net to which a tackiness is imparted by surface modification treatment while having water
repellency by a fluorine-based resin as a dust cap.
[0008]
That is, the loudspeaker according to the present invention includes a magnetic circuit held in a
frame, a diaphragm coupled to a voice coil and coupled to an outer peripheral portion of the
frame, and a ventilating member disposed on the front portion of the diaphragm and covering
the voice coil. In a speaker having a sound-proof dust cap, the dust cap is subjected to water
repellent finish treatment with a fluorine resin on both sides of a cloth made of polyester fiber,
and only one side thereof is sputter-etched or corona discharge. Adhesion improvement with a
reduction rate of 4 to 54% and an oxygen increase rate of 14 to 143% By applying a surface
modification treatment, a viscosity of 500 g / 19 mm or more is secured, and the surface is
modified It is characterized in that it is coupled to the diaphragm or the voice coil in a plane.
[0009]
The speaker according to the present invention can be bonded to the diaphragm or voice coil
with high bonding productivity by using a water repellent net with improved adhesion of the
mounting surface as the dust cap, and We realized prevention of water droplet intrusion and
control of acoustic load.
As a result, the performance and the quality of the speaker can be improved, the productivity can
be greatly improved, and the cost can be reduced, and the industrial value is extremely large.
[0010]
Hereinafter, embodiments of the present invention will be described based on the drawings.
The speaker whose cross section is shown in FIG. 1 adopts an external magnet type magnetic
circuit, and the magnet 1, the upper plate 2 and the lower plate 3 constitute a magnetic circuit 4,
and the center pole of the lower plate 3 A magnetic gap 10 is formed on the outer peripheral side
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of 15.
A cone-shaped frame 6 is coupled to the upper plate 2 at its inner periphery, and a cone-shaped
diaphragm 7 is coupled to the outer periphery of the frame 6 at its outer periphery.
[0011]
Then, the bobbin 16 of the voice coil 8 for driving the diaphragm 7 is coupled to the inner
peripheral end of the diaphragm 7 so that the voice coil 8 fits in the magnetic gap 10, and the
voice coil 8 and the diaphragm 7 It is connected to the frame 6 by means of loose support
members 17 at an intermediate position. Further, a dust cap 18 is disposed so as to cover the
central hole 7 a of the diaphragm 7 and is coupled to the diaphragm 7.
[0012]
The feature of this speaker is that the entire dust cap 18 is constituted by a water repellent net.
The water repellent net is such that both sides of the net substrate are subjected to water
repellent finish with a fluorine resin, and one side is subjected to the adhesion improving surface
modification treatment, and the adhesion is improved on the outside of the single side. The
peripheral edge portion is adhesively bonded to the diaphragm 7 via an adhesive (not shown).
[0013]
As described above, since bonding is performed using the adhesive without using a separate
member such as a resin gasket that has been conventionally used, the productivity of the
mounting process is significantly improved, and the mounting quality is also improved. The air
permeability and the water repellency are almost the same as the water repellent net which has
not been subjected to the surface modification treatment. That is, not only the prevention of
water droplet intrusion and the control of the acoustic load can be realized by the dust cap 18,
but also the improvement of the productivity of the mounting process and the mounting quality
can be realized because the adhesion of the dust cap 18 is high.
[0014]
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As a material of a net substrate of a water repellent net, a material capable of carrying a
sufficient amount of a fluorine resin to exhibit water repellency, and by which the aerated sound
transmitting property is not impaired by the carried fluorine resin used. Such materials include
non-woven fabrics, woven fabrics, ropes, perforated sheets, mesh structures and the like as well
as materials obtained by knitting and processing resins, natural fibers and the like.
[0015]
The water repellent finish treatment with a fluorine-based resin is a general water repellent finish
treatment using a fluorine-based resin such as PTFE (polytetrafluoroethylene) or PFA
(tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer).
[0016]
Adhesion improvement Surface modification treatment is dry discharge treatment such as
sputter etching treatment and corona discharge treatment, and the water repellent net is
completely bonded to the surface of the mounting surface or the bonding surface of the
mounting surface. Applied to
[0017]
As the adhesive material, various adhesive materials (adhesives) such as double-sided tape-like
ones and liquid ones which can be applied or sprayed on the mounting surface can be used.
[0018]
The water repellency and adhesion of the water repellent net will be described in detail.
A corona discharge treatment was carried out only on one side of a water repellent net which
had been subjected to double-sided water repellent finish treatment to impregnate a fluorine
resin with a cloth made of polyester fiber as a net substrate.
And while evaluating the water repellency of this surface-modified water-repellent net, the
adhesive property was evaluated by testing 180 degree | times peeling power using a doublesided adhesive tape (Nitto Denko Corporation NO. 500). .
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[0019]
As a result, the water repellent net using PTFE as the fluorine-based resin has a surface
modification treatment that the fluorine reduction rate is 10% and the oxygen increase rate is
30% (the ratio of constituent elements is calculated using X-ray photoelectron spectroscopy) The
non-treated surface (rear surface) repels water as well as the one without surface modification
treatment, and the treated surface has an adhesive strength of 780 g / 19 mm which satisfies
500 g / 19 mm necessary for sealing.
The tackiness (treated surface) and sufficient water repellency (non-treated surface) satisfying
this 500 g / 19 mm were obtained in the range of 4-54% fluorine reduction rate and 14-143%
oxygen increase rate.
[0020]
When the fluorine and the oxygen are smaller than the above range, the tackiness satisfying 500
g / 19 mm can not be obtained. When the above range is above, both surfaces are modified and
the necessary water repellency does not remain. This result was the same as in the case of a
water repellent net in which another fluorine-based resin such as PFA was used.
[0021]
This is equivalent to the water-repellent net before treatment by using the water-repellent net on
the mounting surface with a surface modification treatment that makes the fluorine reduction
rate 4-54% and the oxygen increase rate 14-143%. It shows that high adhesion reliability can be
ensured while maintaining sound and water repellency.
[0022]
Note that only part of the dust cap 18 may be made of a water repellent net, and the same effect
can be obtained in this case as well.
[0023]
The speaker of the present invention realizes prevention of water droplet intrusion and control of
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acoustic load, and is useful as a speaker used for audio equipment and information
communication equipment such as mobile phones.
[0024]
Cross-sectional view of a speaker according to an embodiment of the present invention Crosssectional view of a conventional waterproof speaker
Explanation of sign
[0025]
4 magnetic circuit 6 frame 7 diaphragm 8 voice coil 10 magnetic gap 18 dust cap
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