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DESCRIPTION JP2000069585

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DESCRIPTION JP2000069585
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker used in various acoustic devices.
[0002]
2. Description of the Related Art A conventional speaker will be described with reference to a half
sectional view of FIG.
[0003]
In the figure, reference numeral 6 denotes a magnetic circuit constituted by a lower plate 9
having a center pole, a ring-shaped magnet 10 and a ring-shaped upper plate 11, and a frame 15
is coupled to the upper surface of the magnetic circuit 6. It is done.
[0004]
An inner peripheral edge is coupled to the voice coil 12 and an outer periphery is coupled to the
frame 15, so that the lower part of the voice coil 12 fits without being eccentric to the magnetic
gap 13 of the magnetic circuit 6. The middle portion of the voice coil 12 is supported by a
suspension 8.
[0005]
An outer peripheral portion of the diaphragm 7 is coupled to the frame 15 together with the
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gasket 14, and an inner peripheral portion of the diaphragm 7 is coupled to the upper portion of
the voice coil 12.
[0006]
Denoted at 1 is a bowl-shaped dust cap joined to the central upper surface of the diaphragm 7,
and 16 are lead wires at both ends of the voice coil 12, each of which is crimped on the surface
of the diaphragm 7. The eyelet 17 is soldered to the respective tinsel wire 18, and the other end
of the tinsel wire 18 is connected by soldering to the terminal 20 of the connector 19 fixed to the
frame 15.
[0007]
The lead wire 16 is coated with an adhesive and bonded to the diaphragm 7.
Also, for the various described bonds it is the most common method to bond using an adhesive.
[0008]
The operation of the conventional speaker configured as described above will be described
below.
First, when an input signal is applied to the voice coil 12 from the connector 19 through the
terminal 20 and the tinsel wire 18, the voice coil 12 is driven according to Fleming's left-hand
rule, and the diaphragm 7 is vibrated by this driving force. It radiates sound into the air.
[0009]
However, in the above-described conventional configuration, when used as a woofer speaker for
bass, the material of the dust cap 1 is used when the weight of the vibration system component is
increased in order to lower the resonance frequency. The method of changing the weight from
general pulp to metal to increase the weight is used.
[0010]
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In the case of a speaker requiring waterproofness, in order to prevent the occurrence of rust, the
material is made of an expensive aluminum alloy, or stainless steel which is difficult to process is
used, or an inexpensive metal is used for rustproof coating on the surface. It is generally selected
to apply a rust-preventive coating from the viewpoint of cost, but as shown in FIG. As a result, the
number of working hours and the production capacity are inevitably limited, which has become a
bottleneck for cost reduction.
[0011]
The present invention is to solve the above-mentioned problems, and it is an object of the present
invention to make a speaker having a metal dust cap highly waterproof and inexpensive.
[0012]
SUMMARY OF THE INVENTION In order to solve the above problems, the loudspeaker according
to the present invention mainly comprises a frame coupled to a magnetic circuit forming a
magnetic gap, and a voice coil fitted in the magnetic gap. The diaphragm is connected so that the
outer periphery is connected to the periphery of the frame, and the voice coil is covered so as to
cover at least the rest of the hook portion of the peripheral end on the diaphragm so as to cover
the adhesive The dust cap is made of a metal-plated dust cap, and by providing a hook on the
periphery of the dust cap, high-speed continuous rustproof plating can be performed, and this
hook can be made on the peripheral edge. Since the remaining unplated part after cutting is the
end face of the dust cap, it is the end face of the dust cap by the adhesive used when it is joined
(joined) with the diaphragm. Cover, and makes it possible to provide inexpensive speakers high
waterproof.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION According to the first aspect of the present
invention, a frame coupled to a magnetic circuit forming a magnetic gap, and a voice coil coupled
to the magnetic gap as a center are coupled to an outer periphery of the frame. A metal plate that
is joined so as to cover the voice coil and a diaphragm attached to the periphery of the frame,
and to cover at least the rest of the hook portion of the peripheral end on the diaphragm. Since it
is composed of a plated dust cap, by providing hooking portions around the periphery of the dust
cap, it is possible to carry out anti-corrosion plating processing at high speed continuously to
achieve cost reduction of the dust cap, and this hooking portion is the rim The remaining part,
which is provided at the end and becomes a non-plated part after cutting, is used as the end face
of the dust cap, and the end face is covered with an adhesive used when contacting (joining) with
the diaphragm. , And it makes it possible to provide inexpensive speakers high waterproof.
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[0014]
An embodiment of the present invention will be described below with reference to FIGS.
In the description, the same parts as those of the prior art are given the same reference
numerals, and the explanation thereof is omitted and only different points will be described.
[0015]
(Embodiment 1) FIG. 1 is a half sectional view of an embodiment of a speaker according to the
present invention, FIG. 2 is a perspective view of a dust cap which is the same main part, and FIG.
FIG.
[0016]
Referring to FIG. 1, reference numeral 2 denotes a severable hooking portion provided on the
peripheral end face of the dust cap 1a.
[0017]
In this dust cap 1a, the hook 4 of the hanging device 3 is hooked on the hook portion 2, and the
dust cap 1a can be immersed in the plating tank 5 to continuously perform plating for rust
prevention. .
[0018]
The exposed metal portion of the remaining portion 2a of the hooking portion 2 of the hooking
portion 2 of the dust cap 1a after cutting is covered with the adhesive 2b, and the dust cap 1a is
coupled to the diaphragm 7.
[0019]
With the construction as described above, the dust cap 1a has no exposed metal portion and can
obtain a dust cap having high waterproofness and being inexpensive.
[0020]
In the above embodiment, the hook portion 2 of the dust cap 1a has been described as being
ring-shaped and hooked on the hook 4 of the suspension device 3. However, according to the
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forms of the speaker and the hook of the plating device It may be set as appropriate, as long as it
does not come off from the hook 4 during plating.
[0021]
Further, the timing for cutting the hook portion 2 of the dust cap 1a is preferably immediately
before being coupled to the diaphragm 7 in consideration of the occurrence of rust.
[0022]
(Embodiment 2) FIG. 4 is a perspective view of the dust cap of the essential part of another
embodiment of the present invention, and FIG. 5 is a half sectional view of the same speaker.
[0023]
The dust cap 1b is provided with a cylindrical portion 1c which can be joined to the upper end
portion of the voice coil 12.
[0024]
According to the above-described structure, it is possible to obtain the dust cap 1b having high
waterproofness and low cost, and to improve the centering accuracy and the bonding strength of
the dust cap 1b.
[0025]
Although the bonding of the dust cap 1b to the voice coil 12 in the present embodiment is on the
inside of the ring of the voice coil 12, it may be on the outer and upper end faces, and may be
appropriately set according to the form of the speaker. It is good.
[0026]
As described above, in the speaker of the present invention, the dust cap is provided with a
cuttable hook portion used for hanging at the time of plating, and is hung by the hook of the
hanging device and attached to the plating tank Since it becomes easy to carry out plating at high
speed and the remaining part of the hook part cut after plating is the end face of the dust cap, it
is an adhesive used when joining to the diaphragm, and the end face is extremely It is possible to
easily make the speaker with the covering metal dust cap highly waterproof and inexpensive.
[0027]
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Brief description of the drawings
[0028]
1 is a half sectional view of an embodiment of the speaker of the present invention
[0029]
Fig. 2 A perspective view at the time of plating of the dust cap which is the same main part
[0030]
Fig. 3 Schematic of the plating process
[0031]
4 is a perspective view of the dust cap of the main part of the same other embodiment
[0032]
Fig. 5 Half sectional view of the same speaker
[0033]
Fig. 6 Half sectional view of the conventional speaker
[0034]
Fig. 7 is a schematic view showing the application state of the dust cap which is the main part
[0035]
Explanation of sign
[0036]
1a, 1b Dust cap 2 Hook portion 2a Remaining portion 2b of hook portion Adhesive 6 Magnetic
circuit 12 Voice coil 13 Magnetic gap 15 Frame
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