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JPH0715795

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPH0715795
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker used in various audio equipment.
[0002]
2. Description of the Related Art In recent years, the speaker has been required to be thin from
the viewpoint of space saving, and a structure suitable for assembly automation for labor saving
has been awaited.
[0003]
A conventional speaker will be described below with reference to the drawings.
FIG. 4 shows the structure of a conventional speaker in cross section. In FIG. 4, 21 is a lower
plate having a center pole made of iron, 22 is a magnet, and 23 is an upper plate made of iron.
The magnetic circuit 24 is coupled to constitute a magnetic circuit. A voice coil 27 wound around
a voice coil bobbin 26 is inserted into a magnetic gap 25 formed in the magnetic circuit 24 with
its center portion being supported by a flexible damper 28 formed of resin or the like by resin
coating of cotton cloth or the like. ing. A diaphragm 29 has an inner peripheral portion fitted and
bonded to the voice coil bobbin 26. The outer peripheral portions of the damper 28 and the
diaphragm 29 are bonded and fixed to the peripheral portion of the frame 30 made of metal
01-05-2019
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such as iron plate or resin.
[0004]
31 is a so-called gold thread wire in which a cotton thread is used as a core and a copper foil is
braided, and is electrically connected to the start end of the winding of the voice coil 27 on the
voice coil bobbin 26 by soldering or welding. It is firmly fixed to the voice coil bobbin 26. The
position where the pair of gold wire 31 is fixed to the voice coil bobbin 26 is located in the
middle of the joint between the damper 28 and the diaphragm 29 and the voice coil bobbin 26
and the two gold wire 31 fixed at this position are A space formed between the diaphragm 29
and the damper 28 is radially drawn toward the periphery of the speaker, and connected to a
terminal 32 attached to the frame 30 by soldering or the like.
[0005]
The operation of the conventional speaker configured as described above will be described
below. First, when an electrical signal is applied to the terminal 32, the voice coil 27 inserted into
the magnetic gap 25 is acted upon via the gold wire 31 to generate a driving force, which is fixed
thereto via the voice coil bobbin 26. The vibrating plate 29, the damper 28 and the gold wire 31
are vibrated in the longitudinal direction of the voice coil bobbin 26. Since the diaphragm 29 and
the damper 28 are fixed by an adhesive or the like by the voice coil bobbin 26 and the frame 30,
even if the amplitude of the voice coil bobbin 26 increases, vertical vibration is performed in
synchronization with the voice coil bobbin 26. However, the gold wire 31 drawn to the space in
the middle acts as a so-called rope fixed at both ends, and the state of vibration changes
according to the frequency of the input signal.
[0006]
However, in the above-described conventional configuration, as described above, since the
operating state accompanying the vibration of the gold wire 31 changes depending on the state
of the input signal, especially the low frequency around the lowest resonance frequency of the
speaker When a signal containing a large amount of components is applied to the speaker as a
large input signal, the gold wire 31 is drawn to the large amplitude of the voice coil bobbin 26 to
perform a so-called skipping motion, and the vibration direction of the diaphragm 29 and the
damper 28 It has a problem that it vibrates in an unrelated direction or in the opposite direction.
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Therefore, in such a case, since the gold wire 31 has the diaphragm 29 and the damper 28
disposed in the vicinity thereof, the gold wire 31 subjected to vibration collides with the
diaphragm 29 and the damper 28, A so-called contact with a gold wire is generated to cause a
failure in the operation of the speaker, and the method of routing the gold wire 31 has been a
major problem.
[0007]
As a factor which such a problem generate | occur | produces, the gold wire 31 of a speaker is to
be as thin as possible, and to be flexible. That is, in order to reproduce the vibration of the
speaker as much as possible with high fidelity without distortion, the above-mentioned property
is required for the gold wire 31, but as a result, the gold wire 31 jumps off the rope due to its
flexibility and fineness. The result is that it is easy to do and leads to the above defects.
[0008]
In order to solve this problem, there is a method in which the gold wire 31 is separated from the
diaphragm 29 and the damper 28 by a large distance as one of the methods. In this method, the
diaphragm 29 and the damper 28 result. The overall height of the speaker increases by the
amount of the distance between the two, which is an obstacle to thinning the speaker. In
addition, as a method for preventing the overall height from increasing, a speaker of a type in
which a gold thread 31 is woven or sewn into a cotton cloth or the like constituting the damper
28 has conventionally been present.
[0009]
However, such a gold wire 31 woven or sewn into the damper 28 hinders the flexibility and
smooth amplitude operation required for the original gold wire 31, and when a high input is
applied, the voice coil bobbin 26. And the gold thread 31 woven at the joint of the damper 28 is
broken due to metal fatigue, causing a failure, which is unreliable and has a problem of being
unsuitable for a speaker used with a large input there were.
[0010]
As described above, in the conventional configuration, the distance from the gold wire 31 to the
diaphragm 29 and the damper 28 is reduced to make the speaker thinner, and the gold wire 31
rich in flexibility and flexibility can be used for large input signals. It had the problem that the
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speaker was not able to be done.
[0011]
SUMMARY OF THE INVENTION The present invention solves such conventional problems, and
provides a speaker having a gold thread capable of achieving thinness by reducing the distance
between a diaphragm and a damper and capable of flexible and flexible operation. Purpose.
[0012]
SUMMARY OF THE INVENTION In order to solve this problem, the speaker according to the
present invention covers a gold wire drawn from a voice coil and connected to a terminal with a
sealing material of foam type hot melt made of terpene phenol resin. At the same time, a part of
the gold wire coated with the sealing material is closely fixed to the surface of the damper.
[0013]
Since the gold wire is covered with the flexible seal material and fixed on the damper, the gold
wire does not hit the diaphragm even if the distance between the diaphragm and the damper is
reduced. Due to the cushioning properties of the sealing material, the gold wire can operate
without losing its flexibility in its operation, and therefore can operate without breaking even
when a large input signal is applied.
[0014]
DESCRIPTION OF THE PREFERRED EMBODIMENT A loudspeaker according to an embodiment of
the present invention will be described below with reference to the drawings.
FIG. 1 shows the structure of the speaker in the same embodiment in cross section. In FIG. 1, 1 is
a lower plate having a center pole made of iron, 2 is a magnet, 3 is an upper plate made of iron,
The magnetic circuit 4 is configured by coupling.
[0015]
A voice coil 7 wound around a voice coil bobbin 6 in a magnetic gap 5 formed in the magnetic
circuit 4 is supported at its central portion by a damper 8 which is made of resin and is coated
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4
with a cotton cloth or the like.
A diaphragm 9 is fitted and bonded to the voice coil bobbin 6 at the inner peripheral portion
thereof.
The outer peripheral portions of the damper 8 and the diaphragm 9 are bonded and fixed to the
peripheral portion of the frame 10 made of metal such as iron plate or resin.
[0016]
The reference numeral 11 denotes a gold wire, which is electrically connected to the beginning
of the winding of the voice coil 7 on the voice coil bobbin 6 by soldering or welding, and is firmly
fixed to the voice coil bobbin 6.
Further, the pair of gold wire 11 is coated with a one-component foam sealing material 12 which
is formed by applying and foaming a foam-type hot melt made of terpene phenol resin so as to
wrap the gold wire 11 coaxially. As in the case of the insulation coating, the gold wire 11 is
wrapped.
Further, the seal member 12 has a structure in which a part of the outer periphery thereof is
closely fixed to the surface of the damper 8, and the other end of the gold wire 11 is connected
to a terminal 13 attached to the frame 10.
[0017]
When applied to the gold wire 11 and the damper 8, the sealing material 12 made of terpene
phenol resin exhibits excellent foamability and adhesion effect for closely fixing the gold wire 11
with flexibility on the damper 8. It has excellent properties. That is, terpene phenol resin can be
naturally foamed by blowing it from the nozzle to the application position while heating and
foaming at 200 ° C. in a container of a coating machine in which nitrogen gas is sealed, and it is
flexible even after completion of foaming. It is rich in nature and also has good adhesion to cloth
materials and the like.
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[0018]
The detailed configuration and operation of the main part of the speaker according to the present
invention configured as shown in FIG. 1 will be described with reference to FIGS. 2 and 3. In FIG.
2, reference numeral 11 is a gold thread, and a foaming type hot melt 12a made of terpene
phenol resin is applied to coaxially cover the gold thread. Further, when applying in this manner,
the gold wire 11 is disposed in the vicinity of the upper surface of the damper 8, and the foam
hot melt 12 a is applied from above the gold wire 11 with a nozzle. Thus, the sealing material 12
is formed to cover the periphery of the gold wire 11 and the foam-type hot melt 12a adheres to
the damper 8 so that the gold wire 11 can be covered with the sealing material 12 and fixed to
the damper 8. This state is shown in FIG.
[0019]
Even if the voice coil bobbin 6 has a large amplitude by applying a signal to the speaker of the
present embodiment, the gold wire 11 vibrates in conjunction with the damper 8 and the gold
wire 11 and the sealing material 12 are flexible. Since it is possible to make it flexible and
flexible, even if the distance between the diaphragm 9 and the damper 8 is set small, the gold
wire 11 can be operated normally without hitting the diaphragm 9, and the gold wire 11 can be
operated properly. Excellent effects can be obtained in terms of prevention of hitting.
[0020]
As described above, in the speaker according to the present invention, the gold wire is coaxially
wrapped so as to be covered with the sealing material, and the sealing material is closely fixed to
the upper surface of the damper. Excellent in that it is possible to apply large inputs in a thin
configuration because it can prevent the gold wire from being hit by the rope skipping
phenomenon, and it does not impair the flexibility of the damper like a gold wire thread-stitched
damper or break of the gold wire due to mechanical fatigue. Speaker can be realized.
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