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JPS63224589

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DESCRIPTION JPS63224589
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
flat diaphragm used for various acoustic devices. In the prior art in general, a flat diaphragm was
constructed as shown in FIG. Skin materials 1 such as aluminum were adhered to the upper and
lower sides of a core material 4 made of aluminum or natural fiber using a thermoplastic
polyamide film 3. Problems to be Solved by the Invention With the conventional diaphragm
configuration, the weight of the skin material 1 and the core material 40 is heavy, which leads to
a reduction in sound pressure level when incorporated in a speaker. There is also a problem that
the high frequency reproduction frequency band is also lowered. The present invention is
intended to provide a flat diaphragm which can solve this problem. SUMMARY OF THE
INVENTION In order to solve this problem, the present invention is a sheet material having a
valve seat as a base on both sides of a non-Nikam structure, an aluminum layer on the surface
and a thermoplastic acetic acid film on the back. Are stacked. Since the sheet material is disposed
between the acting aluminum layer and the honeycomb structure, weight reduction can be
achieved. EXAMPLE Hereinafter, a flat diaphragm in an example of the present invention will be
described. FIG. 1 shows an embodiment of the present invention. 11 is a 9 μ thick aluminum
layer, 12 is 40 gr / rr? It is a sheet material of natural fiber of the amount per unit area. This is
bonded with a reactive moisture curing urethane adhesive to form a skin material. 13 is a vinyl
acetate-based thermoplastic film having a thickness of 20μ, and 14 is a honeycomb structure
made of natural fibers. These were laminated, and a flat diaphragm was obtained by a heating
press of 200'C or more. FIG. 2 shows sound pressure frequency characteristics of a speaker using
the flat diaphragm of the present invention. The sound pressure level is improved because the
weight of the diaphragm is reduced as compared with the prior art, and the high frequency
reproduction limit frequency is also extended. As described above, the valve sheet material 12 is
used as a base material, the aluminum layer 11 of 10 μm or less is provided on the surface, and
11-05-2019
1
the thermoplastic film 13 is adhered on the back surface with a reactive moisture curing
urethane adhesive. This is laminated on the upper and lower sides of the honeycomb structure
14 and heated to melt the thermoplastic film 13 and to be bonded to the honeycomb structure
14 to obtain a flat plate diaphragm. In the configuration in which the conventional aluminum
skin and the honeycomb structure are adhered to each other using a thermoplastic polyamide
film, the adhesion between the aluminum and the polyamide film is poor, and a peak dip occurs
in the frequency characteristics when incorporated in a speaker, or the high frequency
reproduction limit Although there is a problem that the frequency is low, in the present
embodiment, a sheet material 12 of a natural fiber in the form of a foil is inserted between the
aluminum layer 11 and the honeycomb structure 14 to reduce the weight of the aluminum layer
11. The adhesion between the honeycomb structure 14 as the core material and the aluminum
layer 11 is also good.
From the above, there is no problem that a peak dip occurs in the sound pressure frequency
characteristic or the high frequency reproduction frequency band is lowered. Effects of the
Invention As described above, since the flat diaphragm of the present invention is configured,
improvement in sound pressure level, sound pressure frequency characteristics with less peak
dip, and further improvement in the high-frequency reproduction limit frequency band can be
achieved industrially. It will be a dog.
[0002]
Brief description of the drawings
[0003]
1 is a structural cross-sectional view of the flat plate diaphragm of the present invention, FIG. 2 is
a sound pressure frequency characteristic diagram of a speaker using the flat plate diaphragm of
the present invention, and FIG. 3 is a structural cross-sectional view of a conventional flat plate
diaphragm. is there.
11 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
thermoplastic film, 14 ° ° ° honeycomb structure.
11-05-2019
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