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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to
improvement of supporting members such as edges and dampers for elastically supporting a
diaphragm for an electroacoustic transducer. [Description of the Related Art] A support member
of this type will be described, for example, for an edge for a speaker diaphragm. After a zerocotton cloth or the like is impregnated with a thermosetting resin, it is coated with a viscoelastic
material such as rubber, A coating cloth edge heat-formed into a shape, and a urethane foam
edge obtained by heat-forming a urethane foam sheet into a predetermined edge shape have
been widely used. [Problems to be solved by the invention] By the way, the above-mentioned
conventional edge has various unsatisfactory points, and for example, the linearity of the inputdisplacement characteristic is not good because of the lack of stretchability of the material itself.
Also, since the coating amount of the visco-elastic material has to be substantially reduced due to
the weight increase due to the coating Hfa and the coating layer, the damping effect of the highfrequency resonance is poor due to the insufficient part loss, and the flat frequency characteristic
is There is a problem that can not be obtained easily. The stretchability of the edge of ■ is better
than that of the above-mentioned ■, but the internal loss is not sufficient and has the same
problem as the edge of ■, and furthermore the light resistance is poor and the deterioration of
physical properties due to light is significant. The [Means for Solving the Problems] In the
present invention, the support member of the diaphragm for an electroacoustic transducer is
formed of a polyesteramide elastomer. [Function co. Due to good stretchability by the support
member, sufficient internal loss, good light resistance and heat resistance, the diaphragm can be
ideally supported and the frequency characteristics are good and aged It was possible to provide
an electroacoustic transducer with less change. EXAMPLES The present invention will be
described by way of examples. 0.3 mm thickness by extruding a polyesteramide elastomer whose
chemical structural formula is represented by (-(CO-NH- (CH2 ±-■ CO (CH2 + rOCOfO → CH2 +
t ÷ 堵 p-5 or 11, m, n: integer) The sheet was vacuum-formed into an edge of the shape shown
in FIG. And the said edge was combined with the magnetic circuit etc. and the speaker 1 was
manufactured. On the other hand, as a comparative example, a coated cloth edge in the shape
shown in FIG. 1 and a urethane foam edge (thickness 8 foot) were respectively combined with the
same magnetic circuit to obtain a speaker 2.3. [Effects of the Invention] The input-displacement
characteristics and frequency characteristics of the speaker 1 of the present invention and the
comparative example speaker 2.3 are shown in FIGS. 2a, 2b and 3, respectively. The light
fastness of the urethane edge (by means of a carbon scaler meter) is shown in FIG.
From FIGS. 2a and 2b, according to the embodiment of the present invention, the linearity is
extremely excellent and the difference in the reciprocating displacement of the diaphragm, that
is, the hysteresis is extremely small. Further, from FIG. 3, according to the embodiment of the
present invention, the peak of the high-frequency resonance is mitigated and a flatter frequency
characteristic 19 can be obtained. This shows that the damping action of the edge of the
embodiment of the present invention is good. Further, from FIG. 4, according to the embodiment
of the present invention, the deterioration of physical properties by light irradiation is extremely
small, and the light resistance is improved, thereby providing an advantage which is not so
conventional, such as little deterioration of characteristics due to aging. Furthermore, according
to this example of the invention, it was found that the Young's modulus of the edge hardly
changes in the temperature range of 10 ° C to 70 ° C and that the characteristic change due to
the temperature has almost negligible advantage.
Brief description of the drawings
1 is a diagram of the shape of an embodiment edge, FIG. 2a is an input-displacement
characteristic diagram of a speaker using the edge of the embodiment of the present invention,
FIG. 2b is an input-displacement characteristic diagram of a speaker using a conventional edge,
FIG. 3 is a frequency characteristic diagram of a speaker using the edge of the present invention
and the prior art, and FIG. 4 is a characteristic diagram showing the light resistance of the edge
of the embodiment of the present invention.
Patent Applicant Onkiyo Co., Ltd.-F! ? ! Fortune β January (H-to)
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description, jps62247699
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