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JPH05328487

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DESCRIPTION JPH05328487
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker diaphragm used for various acoustic devices and a method of manufacturing the same.
[0002]
2. Description of the Related Art Heretofore, as a waterproof paper pulp diaphragm used for a
door mount speaker for vehicles etc., it has been constructed as shown in FIG. 4 and FIG. That is,
the diaphragm 1 formed by papermaking of the pulp fiber 4 is dipped in a synthetic resin
solution in a later step to adhere the synthetic resin 3 to the surface of the paper, thereby
preventing the entry of water. With this configuration, the waterproofness is improved, the
surface appearance is improved, and the specific elastic modulus (Young's modulus / density)
required for the speaker diaphragm is improved.
[0003]
However, in the above-described conventional configuration, the diaphragm becomes heavy
when the synthetic resin 3 only for preventing the entry of water is attached in order to allow the
synthetic resin 3 to penetrate to the inside of the pulp fiber 4. , There was a problem that the
sound pressure of the speaker is reduced. Moreover, since the synthetic resin layer 3 which
prevents the penetration of water is only on the surface, there is a problem that the
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waterproofness is lost if the surface is scratched due to an accident of handling or the like.
Furthermore, in the above-described conventional configuration, although the inelastic modulus
of the diaphragm is improved, the internal loss is reduced, and the harmonic distortion of the
speaker is increased.
[0004]
An object of the present invention is to solve the above-mentioned conventional problems, to
exhibit excellent waterproof performance, and to provide a speaker diaphragm of high sound
quality.
[0005]
[Means for Solving the Problems] In order to solve the above problems, according to the present
invention, a diaphragm is formed by forming a synthetic resin layer on the surface of a paper
pulp of paper pulp on which a synthetic resin having a fluorine group at its end is fixed. It is what
constitutes.
Further, in order to form a synthetic resin film on the surface, paper pulp on which a synthetic
resin having a fluorine group at its end is fixed is made into a paper, and it is immersed in a
solution of the synthetic resin after hot press molding.
[0006]
[Function] The synthetic resin having a fluorine group at the end is water repellant, and develops
waterproofness only by being fixed to a small amount of paper pulp. That is, waterproof
performance as a diaphragm can be satisfied. In addition, when the diaphragm is immersed in a
synthetic resin solution, a synthetic resin film can be formed only on the surface of the
diaphragm in order to prevent the synthetic resin from intruding into the inside of the pulp.
Therefore, the coating can be formed with a small amount of synthetic resin, and since the resin
does not infiltrate into the paper pulp, the high internal loss inherent to the paper pulp is not
reduced, and the weight of the diaphragm is not increased.
[0007]
Furthermore, since the entire paper pulp has waterproof performance, waterproofness is not lost
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even by handling scratches and the like.
[0008]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A loudspeaker diaphragm
according to an embodiment of the present invention will be described with reference to the
drawings.
[0009]
1 and 2 are perspective views showing the configuration of a speaker diaphragm according to
the present invention.
In FIG. 1 and FIG. 2, the diaphragm 1 beats softwood-based unbleached kraft pulp 2 to a
Canadian freeness of 680 cc, and after addition of a predetermined dye, paper strength agent
and sizing agent, acrylic having fluorine group at the end An emulsion of resin (Dickguard F-400
manufactured by Dainippon Ink and Chemicals, Inc.) is added to the paper and pulp raw material
at 3 wt% and stirred.
Next, aluminum sulfate (Sumitomo Chemical Sulfate) is added with stirring until the pH of the
balp solution becomes 5.0. The resulting pulp solution is made into a diaphragm 1 with a
diaphragm-shaped papermaking net, heat pressed and molded, immersed in a 4-fold diluted
solution of a polyester synthetic resin, and then dried at 100 ° C. for 10 minutes to obtain
polyester. The synthetic resin film 3 is formed to obtain the speaker diaphragm of the present
invention.
[0010]
It was 8% when the weight increase rate of the diaphragm by formation of the synthetic resin
film 3 was measured about the diaphragm for speakers of this invention. This is less than the
12% weight gain of conventional synthetic resin dipping methods. Further, with respect to the
speaker diaphragm of the present invention, when a waterproof test was performed in which
water was stored at a minimum water depth of 30 mm on the back surface of the diaphragm and
left for 96 hours, no water leakage occurred. Furthermore, with respect to the diaphragm for a
speaker of the present invention, a part of the diaphragm was cut between layers to a thickness
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of about half and the same waterproof test was performed, but no water leakage occurred.
[0011]
Furthermore, the physical properties of the speaker diaphragm of the present invention, the
immersion diaphragm of a conventional synthetic resin (Comparative Example 1), and the
diaphragm (diaphragm 2) of a state in which the synthetic resin is not immersed It became like
the following (Table 1).
[0013]
Next, the speaker sound plates of the present invention and Comparative Example 1 were made
into 10 cm diameter speakers, and the output sound pressure characteristics and harmonic
distortion characteristics were measured. The results are shown in FIG.
It can be seen that the third harmonic distortion from 2 kHz to 5 kHz is improved by about 5 dB.
[0014]
As described above, since the speaker diaphragm according to the present invention is
constructed, the waterproof performance is effectively achieved without increasing the weight of
the diaphragm and reducing the internal loss of the diaphragm. It is possible to obtain a high
speed of sound, which is a great industrial value.
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