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JPH04360499

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DESCRIPTION JPH04360499
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
diaphragm for audio equipment used in various kinds of audio equipment.
[0002]
2. Description of the Related Art Polyphenylene sulfide (hereinafter referred to as PPS) is a film
used as a conventional diaphragm for audio equipment, and this PPS film has been heat-molded
and used as a diaphragm.
[0003]
Problems to be Solved by the Invention PPS films have remarkable deterioration in strength in
terms of weathering reliability, and when they are used as diaphragms, their frequency
characteristics are also 1 to 2 dB as shown in FIG. There was a drawback of lowering.
[0004]
The present invention is intended to eliminate the above-mentioned conventional drawbacks, to
provide a diaphragm for acoustic equipment which is excellent in weathering reliability and
which has a small change in frequency characteristics.
[0005]
SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present
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invention is constructed by providing a deposited layer of aluminum particles on a PPS film layer
and providing an epoxy coating layer thereon. is there.
[0006]
As described above, by forming the aluminum deposition layer on the PPS film layer and
providing the epoxy coating layer thereon, the deterioration of the physical property value of the
film due to the ultraviolet light is prevented, and the diaphragm as an acoustic device diaphragm
is provided. It is possible to improve the reliability.
[0007]
Embodiments of the present invention will be described below with reference to the drawings.
[0008]
FIG. 1 is a cross-sectional view of a diaphragm for audio equipment according to the present
invention.
In this diaphragm for acoustic devices, a 0.04 μ thick aluminum vapor-deposited layer 2 is
formed on a 50 μ PPS thick layer 1 in which aromatic rings are bonded by sulfur, and 2 μm
thick on this aluminum vapor-deposited layer 2 The epoxy coating layer 3 is used.
[0009]
Fig. 2 shows the tensile strength retention as a result of the weather resistance test of the
diaphragm for audio equipment and the diaphragm for acoustic equipment of the prior art using
the above-mentioned embodiment, and The output sound pressure characteristic in the unsteady
state is shown in FIG.
[0010]
The diaphragm for audio equipment of the present invention is better than the conventional one
in all respects.
[0011]
As described above, the diaphragm for audio equipment of the present invention has great
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industrial value which can realize an audio equipment having excellent weather resistance.
[0012]
Brief description of the drawings
[0013]
1 is a cross-sectional view of a diaphragm for acoustic equipment according to an embodiment of
the present invention.
[0014]
Fig. 2 Characteristic diagram showing the tensile strength retention ratio of the present invention
and the conventional diaphragm for acoustic equipment by weathering test
[0015]
Fig. 3 Characteristic diagram showing the elongation retention ratio of the present invention and
the conventional diaphragm for acoustic equipment by weathering test
[0016]
Fig. 4 Frequency characteristics of the diaphragm for audio equipment of the present invention
by weathering test
[0017]
Fig. 5 Frequency characteristics of the conventional diaphragm for acoustic equipment by
weathering test
[0018]
Explanation of sign
[0019]
1 PPS film layer 2 Aluminum deposition layer 3 epoxy coating layer
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