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JPS61189799

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DESCRIPTION JPS61189799
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
edge which is a supporting member of a speaker used as an audio output device such as a
cassette tape recorder, a microcassette tape recorder and a high fidelity stereo. 2. Related Art In
recent years, in industries such as cassette tape recorders, microcassette tape recorders and hi-fi
stereos, there is a tendency to improve the performance and reduce the cost of the equipment
itself. Along with this, the speaker as a sound output device is also advanced in cost and
performance. In addition, in terms of acoustic characteristics, a speaker with better output sound
pressure, distortion factor, and flatness than ever before is desired, and the edge, which is the
main component of the support system of the speaker that influences the acoustic
characteristics, becomes increasingly important It is done. The above-described conventional
speaker will be described below with reference to the drawings. FIG. 6 is a cross-sectional view of
a vibration system and a support system of a conventional speaker. In FIG. 5, 1 is an edge, 2 is a
diaphragm fixed to edge 1, 3 is a voice coil bobbin whose tip is fixed to diaphragm 2, and 4 is
inserted into the magnetic gap (not shown) of the magnetic circuit. It is a voice coil. The
operation of the loudspeaker configured as described above will be described below. As shown in
FIG. 5, the speaker is a support system of the edge 1 and a vibration system such as the
diaphragm 2, voice coil bobbin 3 and voice coil 4 and a magnetic circuit system (not shown)
including magnets, balls, plates and yokes. It consists of. When a voice current flows through the
voice coil 4 in a uniform magnetic field, a vertical electromagnetic force is generated in the voice
coil bobbin 3 and vibrates according to the current. This vibration is correctly transmitted to the
diaphragm 2 and emitted as a sound wave. Further, the periphery of the diaphragm 2 is fixed to
the edge 1, whereby the vibration of the diaphragm 2 is damped and leakage of the vibration to
the outside is suppressed. (E.g., Hisao Hayasaka: Introduction to Acoustics Engineering, 9th
Century, Inc.) Problems to be solved by the invention The edge coupled to the diaphragm of the
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speaker generally requires the following performance. (1) Non-linear distortion is small with
respect to vertical vibration. (2) There is a braking effect. (3) There is no breathability. (4) Be
lightweight. (6) Low cost. Conventional edges are made of natural fibers such as cotton, synthetic
fibers such as nylon and polyester, impregnated with acrylic resin and melamine resin, dried,
heated and pressed to form an edge, and then suitable mechanical In order to obtain a loss, a
visco-elastic resin in which an acrylic resin or the like and a plasticizer are mixed is applied and
dried.
However, since the above-mentioned edge has a low stretchability of the woven fabric itself, by
providing stretchability by deformation of the shape of the edge (for example, corrugation etc.),
the diaphragm is supported against the vertical vibration of the diaphragm. Since the amplitude
can not be obtained for some reason, abnormal vibration or distortion is likely to occur for a
large input signal. In addition, a visco-elastic resin is applied in order to prevent a reflected wave
to the diaphragm by giving a suitable mechanical loss, but as a result, the coating method of the
visco-elastic body causes uneven coating and air permeability, and increases the strain rate. And
a reduction in the output sound pressure, and the addition of a coating process also causes a cost
increase. Furthermore, since a large amount of viscoelastic resin is used to obtain mechanical
loss, the weight of the edge itself increases and the effective mass of the vibration system
increases, which causes the efficiency of the speaker to be lowered. SUMMARY OF THE
INVENTION In view of the above problems, the present invention provides an edge which has
small non-linear distortion with respect to vertical vibration, has a suitable mechanical loss, has a
braking action, has no air permeability, is lightweight, and has low cost. It is. Means for Solving
the Problem In order to achieve this object, the edge of the present invention comprises
crystalline polyester moiety () segment in the molecular chain and amorphous polyether moiety
(soft segment) The polyester elastomer is formed by blow molding. Operation According to this
configuration, the vibration of the diaphragm is mainly absorbed by the amorphous portion (soft
segment) of the polyester elastomer, and the reflected wave to the diaphragm can be prevented.
This corresponds to a visco-elastic resin applied to a conventional edge material. The polyester
elastomer t is a copolymer obtained by copolymerizing an amorphous polyether to impart
rubbery properties to a terephthalic acid based crystalline polyester. Therefore, since the
crystalline polyester part (hard segment) in the polymer exhibits hardness and the noncrystalline polyether part (soft segment) expresses softness, the elastic modulus 2 is obtained by
changing the ratio of both segments. Machine loss can be changed arbitrarily. As a result, it is
possible to use an elastomer having material properties suitable for the device, and it is possible
to obtain any stiffness and mechanical loss. Embodiment Hereinafter, a speaker using an edge
according to an embodiment of the present invention will be described with reference to the
drawings. 2 and 1 show a side sectional view and a top view of an edge according to an
embodiment of the present invention. FIG. 3 is a cross-sectional view of a speaker equipped with
an edge according to the present invention.
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2
In FIG. 3, 6 is an edge, 7 is a diaphragm fixed to edge 6, 8 is a voice coil bobbin whose tip is fixed
to diaphragm 6, and 9 is inserted into the magnetic gap (not shown) of the magnetic circuit. It is
a voice coil. Edge 6 is configured as follows. First, the polyester elastomer pellet was dried at 80
to 120 ░ C. for 2 to 4 hours so that the water content in the teherenode in the pellet dryer was
0.1% or less, and then molded by a blow molding method to form an edge. The operation of the
loudspeaker configured as described above will be described below with reference to FIG. As
shown in FIG. 3, the speaker comprises an oscillating system such as an edge 6, a diaphragm 7, a
voice coil bobbin 8 and a voice coil 9 and a magnetic circuit system (not shown) consisting of
magnets, poles, plates and yokes. When a voice current flows through the voice coil 9 in a
uniform magnetic field, a vertical electromagnetic force is generated in the voice coil bobbin 8
and vibrates according to the current. This vibration is properly transmitted to the diaphragm 7
and emitted as a sound wave. In the present invention, the periphery of the diaphragm 7 is fixed
to the edge 6 to support the vibration system. As described above, in the present embodiment, by
forming the edge by blow-molding the polyester elastomer, the vibration is absorbed by the
vibration absorbing effect of the polyester elastomer and is not transmitted to the outside, so that
the generation of the abnormal sound is prevented. Further, due to the rubber elasticity of the
elastomer itself, the relationship between the displacement of the edge and the stress is as shown
in FIG. 4, and the linearity of the embodiment is better. A of FIG. 4 is the characteristic B of this
embodiment is the conventional characteristic. Still, since the polyester elastomer by blow
molding is used for the edge material, naturally there is hardly air permeability compared with
the conventional method. Furthermore, since the visco-elastic properties of the elastomer itself
are used to impart mechanical loss, no coating unevenness occurs as compared with the
conventional visco-elastic resin coating method. Furthermore, the weight of the edge itself is
increased, the effective mass of the vibration system is not increased, and the efficiency of the
speaker is not reduced, which leads to cost reduction. Effects of the Invention As described
above, according to the present invention, the edge formed by blow molding a polyester
elastomer has a small non-linear distortion and a damping effect due to the absorption of
abnormal sound and the linearity in the relation of good displacement / stress. It is possible to
obtain an edge for a speaker which satisfies the condition of being light weight and low cost.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a top view of the speaker edge in the first embodiment of the present invention, FIG. 2 is
a side sectional view of the same, FIG. 3 is a sectional view of the speaker with the speaker edge
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mounted, and FIG. FIG. 6 is a cross-sectional view of a conventional speaker.
6 иииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии Voice
coil. Name of agent Attorney Nakao Toshio and 1 other person Fig. 2 и Etsy Fig. 2 и и и и work
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