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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to
improvement of an electroacoustic transducer support member such as an edge or a damper.
[Description of the Related Art] A supporting member of this type will be described, for example,
for a speaker edge. After a thermosetting resin is impregnated into a zero-cotton cloth etc., a
visco-elastic material such as rubber is coated to form a predetermined edge shape. Thermally
molded coated cloth edge ■ Foamed urethane sheet obtained by heat-forming foamed urethane
sheet into a predetermined shape ■ Extruded thermoplastic urethane elastomer into a sheet and
then press-formed into a predetermined shape Thermoplastic urethane elastomer edge is widely
used It was [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 is limited due to the increase in the
amount of coating by the coating layer, etc., the damping effect of the high frequency co-imaging
is scarce by the fact that the internal loss is not sufficiently obtained, and the flat frequency
characteristics are 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
physical properties by light, especially ultraviolet light There was a serious problem of
deterioration. Furthermore, the edge of ■ is superior in stretchability and internal loss as
compared with the above two types of edges. However, although the conventional thermoplastic
urethane elastomer used polyadipate as the main component polyol, the thermoplastic urethane
elastomer using the polyadipate has poor water resistance and has problems in use in a humid
environment, There is a problem in the use in a hot and humid atmosphere because the property
is not sufficient (at most 70 ° C.). [Means for Solving the Problems] The present invention is a
support member for an electroacoustic transducer comprising a thermoplastic urethane
elastomer in which polyhexamethylene carbonate and diisocyanate undergo a polyaddition
reaction 1 q. [Function] The object to be supported can be effectively supported from the point of
good water resistance by the support member, sufficient point of internal loss, and good heat
resistance, and the frequency characteristics are good and inferior conditions It has been
possible to provide an electro-acoustic transducer with low aging, while enabling its use in
EXAMPLES The present invention will be described by way of examples. The product of Bandex
T-6990 (manufactured by Dainippon Ink Chemical Co., Ltd.) is extruded into a 0.3 # thick sheet
as a polycarbonate-based thermoplastic urethane elastomer, and the sheet is further shown in
FIG. Vacuum molded into shape edge.
And the speaker 1 was produced using the said edge. On the other hand, as a comparative
example, a conventional polyadipate thermoplastic urethane elastomer product name Pandex T5167 (manufactured by Dainippon Ink Chemical Co., Ltd.) is produced in the same manner as
described above to produce an edge having the same shape as FIG. The speaker 2 was obtained
using the edge. [Effects of the Invention] In the 70 'C1 humidity 95% atmosphere of the speaker
1 and the comparative example speaker 2 according to the invention example, 50 W white noise
is input to each speaker and continuous operation test is conducted to change the minimum
resonance frequency fo The results are shown in FIG. As apparent from the same results, the
change in the fo of the speaker 1 using the polycarbonate-based thermoplastic urethane
elastomer edge is small, while the fo of the speaker 2 using the polyadipate-based thermoplastic
urethane elastomer edge is significantly reduced, In the 300 hours continuous operation, the
comparative example speaker 2 is f. While the present invention example speaker 1 had a drop
of about 8%, it decreased by about 24%. Next, arrange the speakers 1 and 2 in an atmosphere at
80 ° C. with the opening face vertical, and measure the change of the vertical position of the
edge of the edge, ie the top point of the moving plate, with the passage of time. I got the result of
Also in this result, it was found that the inventive example speaker 1 is superior to the
comparative example speaker in terms of heat resistance because the edge of the invention is
Brief description of the drawings
FIG. 1 is a front view of the embodiment edge, FIG. 2 is an fo-operating time characteristic
diagram of the inventive embodiment speaker and the comparative example speaker, and FIG. 3
is a diaphragm position of the inventive embodiment speaker and the comparative example
speaker It is a change-time characteristic view.
2nd thousand glands 1