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JPH0638296

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DESCRIPTION JPH0638296
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
edge for supporting a diaphragm of a speaker used in various kinds of audio equipment inside a
frame, and a method of manufacturing the same.
[0002]
2. Description of the Related Art A diaphragm of a speaker is composed of a diaphragm main
body 10 emitting sound as shown in FIGS. 3 to 4 and a flexible edge 11 supporting the
diaphragm main body 10, the edge 11 3 is a flexible edge different from the diaphragm main
body 10 as shown in FIG. 4 and a fixed edge where the flexibility is increased by thinning the
outer peripheral portion of the diaphragm main body 10 as shown in the cross section in FIG.
There is a free edge made of. Among them, the fixed edge in Fig. 3 is mainly used for low cost
speakers because it is poor in flexibility and strength but simple in structure, and the free edge is
mainly used for high input and high fidelity speakers. Free edge tends to be used also for general
speakers due to the recent trend towards upgrading of audio equipment.
[0003]
A free-form material is used for an edge using a lightweight material such as a polyether or
polyester-based urethane foam sheet alone and a fibrous base material such as a woven or nonwoven fabric of stretched polyethylene terephthalate (oriented PET) fiber Although there are
edges impregnated with resin or heat-pressed laminated materials coated with a rubbery
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material, they all have flexibility, lightness, and vibration characteristics of the speaker by
suppressing split resonance of the diaphragm and resonance of the edges themselves. It is
required that the mechanical internal loss (tan δ) necessary for the improvement is large, the
wettability with the filler resin is good, and the like.
[0004]
SUMMARY OF THE INVENTION In the conventional free edge having such a structure, although
the edge consisting of the urethane foam sheet alone is relatively inexpensive, it has a large
surface area by foaming so that it is moisture resistant. It is poor in weather resistance, while the
edge obtained by impregnating drawn PET fiber cloth with a filler resin such as phenol resin and
heat pressing is not large in tan δ, and the wettability with the filler resin such as phenol resin is
not good. When deformation stress is constantly applied repeatedly as a speaker edge, there is a
problem to be solved that the durability is poor.
[0005]
Therefore, the present invention solves the disadvantages of the prior art, improves the
followability and durability of the diaphragm at the time of vibration, and has an edge which has
a sufficient TAN δ to make the frequency characteristics of the speaker better. It is an object of
the present invention to provide a speaker that maintains excellent quality by obtaining.
[0006]
A speaker edge according to the present invention for achieving the above object will be
described with reference to FIGS. 1 and 2 showing a cross section and a detailed configuration of
the embodiment edge. A speaker edge 1 attached to an outer peripheral portion of a diaphragm
main body 5 to vibratably support the diaphragm main body, wherein the inside is a polyester
resin 3 and the exterior is a polyamide resin 4 It is characterized in that it is obtained by
impregnating a woven or non-woven fabric made of the gate fiber 2 with 10 to 15% by weight of
a phenol resin as an excipient and heating and pressing it into an edge shape.
[0007]
Since the edge of the present invention is made of polyamide resin on the outside as shown in
FIG. 2, as shown in Table 1, the tan δ value representing internal loss is about 3 as compared
with the conventional drawn PET fiber cloth. The wetting index is also about 10% higher.
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Therefore, as in the frequency characteristic shown by the solid line in FIG. 5, the large dip in the
mid-range is improved to be flat as compared with the characteristic of the conventional example
shown by the dotted line.
[0008]
In addition, the polyester inside the conjugate fiber 2 has a low stretch ratio and is excellent in
dimensional stability.
[0010]
EXAMPLES The conjugate fiber 2 used in the present invention uses a PET resin as the polyester
resin 3 and nylon 66 as the polyamide resin 4, and the respective melt polymers are fused and
simultaneously subjected to discharge spinning.
[0011]
Then, heat drawing was performed at a temperature between 45 to 60 ° C., which is lower than
the secondary transition temperature 60 to 80 ° C. of polyester and higher than the second
transition temperature of polyamide 30 to 45 ° C. In the process, the polyester 3 part has frozen
the arrangement of the polymer and is difficult to deform, and the polyamide 4 part melts the
polymer and forms an eccentric core sheath type bicomponent fiber as shown in FIG.
In such conjugate fibers, the molecular groups in the polyamide and polyester are oriented in the
drawing direction, and fibrillar crystals having a hint of fire are produced.
For this reason, this fiber is characterized by having very excellent strength.
[0012]
Using a woven fabric substrate made of this eccentric core sheath type bicomponent fiber and
having an apparent thickness of 50 microns, impregnating 10 to 15% by weight of phenol resin
as a filler material resin, and molding temperature 260 to 290 The speaker edge 1 was obtained
by heat-pressing for 10 to 12 seconds under a pressure of 1 Kg / cm <2>.
[0013]
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As a conventional example for comparison, a stretched PET fiber woven fabric is used as a woven
fabric base, an edge is obtained in the same process as the embodiment, a 16 cm speaker is
assembled with the above embodiment edge, and frequency characteristics are measured. It was
shown to.
In the characteristic table of the figure, the solid line is an example, and the dotted line is a
conventional example.
[0014]
The above description has been made in detail on the basis of an example considered to be
representative of the edge for a speaker according to the present invention, but the embodiment
of the edge according to the present invention includes the two resin components forming
conjugate fiber, etc. The present invention is not limited to the structure of the above-mentioned
embodiment, for example, includes the composition requirements described in the abovementioned claims, such as polyester resin, polyamide resin type, etc., and exhibits the function of
the present invention. As long as it has the effect to be described, it can be modified as
appropriate.
[0015]
The speaker edge according to the present invention has the following effects.
(1) First, as is apparent from Table 1, the conjugate fiber of the example is covered with a
polyamide resin having excellent heat resistance on the outside as shown in FIG. As shown in FIG.
5, antiphase vibration (edge resonance) with the diaphragm in the middle range is prevented, and
the frequency characteristic is made flat to obtain reproduced sound of excellent quality.
In addition, since the individual's wetting index is improved by about 10%, the molded edge
substrate is mechanically stable and has excellent adhesion to the resin, so that a long life as a
speaker can be obtained. .
The degradation rate is 1/2 or less, and therefore, a product with a long life and stable
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performance can be obtained.
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