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JPS58168399

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DESCRIPTION JPS58168399
[0001]
The present invention relates to an improvement of a speaker diaphragm made of aluminum. The
speaker diaphragm made of aluminum is lightweight and rigid. Therefore, it has excellent sound
pressure frequency characteristics, but has many resonance points in terms of vibration modes
and the like, and has a problem of causing a peaking phenomenon particularly in a high
frequency range. The present invention proposes an aluminum speaker diaphragm free from the
above problems without substantially impairing the excellent sound pressure frequency
characteristics of aluminum, the aluminum layer and the density of 0.92 or less, 1 kHz.
Mechanical loss tangent in the following (hereinafter simply referred to as tan δ) is that of an
organic polymer of 3.5 xlO "or more. The resonance property to be observed in aluminum plate
is improved by being combined with the above-mentioned organic polymer layer having a large
tan δ. However, if the organic polymer to be complexed to aluminum has a high density, or if the
amount thereof used is excessive, the sound pressure frequency characteristics inherent to
aluminum are adversely affected. The upper limit of the density of the organic polymer used in
the present invention and the amount used is limited as described above because of the reason. If
the amount used is less than 0.2 parts, the effect of improving the resonance of aluminum
becomes poor. Particularly, the organic polymer used in the present invention preferably has a
density of 0915 or less, and the amount thereof is preferably 0.4 to 3 parts per 1 part of
aluminum. Examples of the organic polymer that satisfies the requirements for the density and
tan δ described above include polypropylene, polybutene-1, and poly-4-methylpentene-1, and
polypropylene is particularly preferable. Two or more organic polymers may be used in
combination. As long as the amount of the organic polymer used is within the above range, it
may be complexed with the aluminum layer by various methods. For example, a structure in
which organic or five polymer layers are provided on both sides of one layer of aluminum, or a
structure in which an organic polymer layer is provided between two aluminum layers. From the
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viewpoint of resistance to external force, processability, etc., one having a structure in which an
aluminum layer is provided on both sides of the organic polymer layer is particularly preferable.
It is important to ensure that the organic polymer layer and the aluminum layer adhere to each
other, but they may be adhered using a conventional adhesive such as a hot melt adhesive or a
reaction curable adhesive, or the aluminum layer The surface of the substrate may be roughened
in advance by sand blasting, etching or the like, and the organic polymer layer may be meltbonded to the rough surface without using an adhesive. As long as the organic polymer layer
satisfies the requirements for the density and jan δ value described above, agents such as an
anti-aging agent, a coloring agent, and a filler may be blended as necessary.
Further, aluminum does not need to be pure aluminum, and may be an aluminum alloy
containing a small amount of alloy components as long as it has excellent sound pressure
frequency characteristics even if it is light in weight. Hereinafter, the present invention will be
described in more detail by way of examples and comparative examples. Examples 1 to 7 and
Comparative Examples 1 to 4 Pure aluminum foil having a thickness of 0.05 m was placed on
both sides of the organic polymer 7-t of each low-pressure raw material, using a hot plate press
at 200 ° C. A pressure of cm-G was applied and press-bonded to produce a three-layered
speaker diaphragm. In the case of Comparative Example 2, Bond Fast 7B (a polyethylene-based
adhesive manufactured by Sumitomo Chemical Co., Ltd.) is used as the adhesive, and in the case
of Comparative Example 3.4, Examples 1.2.3.5.6, and 7. Were bonded using Bond Face G) (a
polypropylene-based adhesive manufactured by Sumitomo Chemical Co., Ltd.) as an adhesive. In
the case of Example 4, no special adhesive is used because the polypropylene used has
adhesiveness. Table 1 also shows the type and thickness of the organic polymer used and the
amount per part of aluminum. Comparative Example 1 is made of only the above-mentioned
aluminum foil. The minimum resonance frequency of the r 圧 pressure local frequency
characteristic measured by the following method for each example and comparative example is
shown in Table 2 and the measurement method of sound pressure frequency characteristic
according to item 66 of JIS C5531. (Spontaneous) procedure auxiliary equipment May 26, 1957,
Secretary General of Patent Office 1, display of case Japanese Patent Application No. 57-51589
2, title of the invention, diaphragm 3 for speaker, relation with person making correction Patent
application Name of the person (326) Dainichi Nippon Electric Wire & Cable Co., Ltd.
Representative director Yukie Aoyama → Hit the silkworm 対 象 Il + 45, target of correction 5,
content of MiE (1) . (2) Correct “100 Kg / σ − (, J” as “100 Kl 110 n-G” on page 5 line 3 of
the specification. 2. Claims (1) Aluminum layer and a layer of organic polymer whose mechanical
loss tangent at 1 kHz is 3.5XIO-2 or more under a density of 0.92 (n / cm2) are mutually joined.
A speaker diaphragm characterized in that it has a conjugated structure, and the volume of the
organic polymer layer is 02 to 5 volumes per volume of the volume of the aluminum layer. (2)
The speaker diaphragm according to claim 1, wherein an aluminum layer is provided on both
sides of the organic polymer layer. (3) The speaker diaphragm according to claim 1 or 2, wherein
the organic polymer layer is made of polypropylene 7 m.
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