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JPS58154997

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DESCRIPTION JPS58154997
[0001]
The present invention relates to a speaker diaphragm in which a surface material is bonded to
the surface of a core material with an adhesive, and an object of the present invention is to use
an adhesive made of a modified ether type polyester copolymer to obtain peel strength and An
object of the present invention is to provide a speaker diaphragm having high impact strength
and large Q. In general, a plate-like speaker diaphragm is one in which a surface material is
bonded to both sides of a core material with an adhesive, and an epoxy adhesive is used as the
adhesive. However, when an epoxy adhesive is used as an adhesive for a flat diaphragm, there is
a risk that the diaphragm may be broken due to peeling between the surface material and the
core material due to the stress generated when the diaphragm is driven. . In addition, when there
is an impulse input on the diaphragm, the epoxy adhesive has a possibility of breaking due to low
impact strength. In addition, since the epoxy adhesive has a small internal loss (tan δ) of the
material itself, when it is used to fabricate a diaphragm, Q is large, and peaks occur at the highest
resonance frequency, and crossover is generated when designing a speaker system. It has the
drawback of becoming difficult to do. The present invention overcomes the above-mentioned
disadvantages of the prior art. As an adhesive for the surface material and the core material, a
modified ether type polyester brosok copolymer having elasticity obtained by reacting a
polyethylene terephthalate-forming component with a modified alkylene ether / terephthalate
composition is used. The adhesive made of this modified ether type polyester bronocopoly has
the following basic structure. [Modified Alkylene Ether Terephthale] [Attachment has a
crystalline portion with an ethylene terephthalate composition and an amorphous portion with a
modified alkylene ether terephthalate composition. And, by the crystalline part by the ethylene
terephthalate composition, it has large rigidity and can withstand large external stress. In
addition, due to the amorphous portion of the modified alkylene ether / terephthalate
composition, it can withstand the impact of external vibration stress and impulse input, and the
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internal loss due to the non-product portion, it is used for the speaker The Q of the diaphragm
can be kept low. Hereinafter, the speaker diaphragm of the present invention will be described in
detail based on examples. (Example) The adhesive has the structure shown below, m: n 21: 1 The
surface material uses aluminum (38 material) foil with a thickness of 40 μm, and the core
material is aluminum (38 material) with a thickness of 20 pm Using the above-mentioned
honeycomb core (cell diameter 5--), it was bonded at 170 ° C. for 2 minutes and 6 under the
conditions of 9 / ct M and using the above-mentioned adhesive, and was subjected to a peeling
test at 900 G.
The results are shown in the table below. According to the peeling test results at 90 'C, the epoxy
adhesive (epicoat ■ 828.) is more effective in the case of this example. It was larger than the
case of using DDM system). It is believed that this is due to the strength of the viscous portion of
the modified alkylene ether terephthalate composition of the adhesive. Moreover, the flat
diaphragm was produced using the adhesive agent mentioned above, and acoustic measurement
was performed. At this time, the outer diameter of the diaphragm was 191 mm, the height of the
diaphragm was 6 mm, and the weight of the diaphragm was 14 g. The surface material used was
an aluminum foil having a thickness of 40 μm, the core material used was an aluminum
honeycomb core material having a thickness of 20 μm, and the adhesive used was an adhesive
having a length of 40 μ. The results are shown in the figure. In this result, in the diaphragm of
this example, the Q of the high-resonance frequency is about 8 dB lower than that of the
diaphragm using the epoxy adhesive. Moreover, in the result of the input resistance test (DiN
100 W input), the distortion factor of the speaker increased from about 300 hours for the epoxy
adhesive, and the diaphragm broke after about 350 hours, but the diaphragm of this example
had almost distortion factor Did not increase, and did not destroy even after about 500 hours. In
FIG. 1, a indicates the sound pressure frequency characteristic of the diaphragm of the present
embodiment and the sound pressure frequency characteristic of the conventional bu diaphragm.
As described above in detail, according to the present invention, since the surface material is
joined to the surface of the core material with the adhesive composed of the modified ether type
polyester prosork copolymer, the thick speaker with large peel strength and impact strength and
Q It has the advantage of being able to obtain a diaphragm for the purpose of suppressing the
peak at the highest resonance frequency and facilitating the design of the speaker system.
[0002]
Brief description of the drawings
[0003]
The figure is a comparative curve diagram of the sound pressure frequency characteristics of the
speaker diaphragm of the present invention and the conventional diaphragm.
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