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Description 1, title of the invention
Speaker diaphragm
3. Detailed Description of the Invention The present invention relates to a speaker diaphragm in
which the polyethylene terephthalate of the present invention and another material are
laminated. Polyethylene terephthalate has a high modulus of elasticity and is suitable as a
material for a speaker diaphragm, but the internal loss is small. Therefore, by laminating this
polyethylene terephthalate and another material having a large internal loss, the elasticity is
high, and the internal A speaker diaphragm with a large loss is obtained. The modulus of
elasticity of the patented biaxial stretch film of polyethylene terephthalate is 3, 2 × 10 dyn / C
++! No. 241, and the elastic modulus (1, 9 × 10 ′ ′ ayn / ct / I) K of a non-oriented film of
polyethylene terephthalate is large as compared with K, and is suitable as a material for a
speaker diaphragm. However, biaxial stretch film of polyethylene terephthalate has poor molding
processability, and has a drawback that it can not be molded by ordinary vacuum forming and
pressure forming, and bonding when laminated on another material to manufacture a composite
diaphragm It must be adhered using an agent, and the weight increase of this adhesive has the
disadvantage of reducing the conversion efficiency. The present invention provides a speaker and
moving plate that can be directly laminated to another material without deteriorating the
physical properties of polyethylene terephthalate and without using an adhesive, and the
features of the present invention are polyethylene terephthalate and And a point at which an
unstretched film comprising an olefin resin is directly laminated to a woven fabric, a nonwoven
fabric or a thermoplastic film. [Example 1] As shown in FIG. 1, polyethylene terephthalate 10% is
added to polyethylene terephthalate EndPage: 13 basist pellet, and after mixing in an extruder, a
20 μm film is drawn from T-die 1. This unstretched film 2 is directly laminated to a polyester
spunbond of 8 oy / m 2 basis weight (a polyester spunbond of 6 oy / m 2 basis weight cured
with an acrylic / melamine binder, internal loss of 0.02) 3 The ventilation property of polyester
spunbond was prevented, and a 10-m cone type speaker was made on a trial basis. EXAMPLE 2
As shown in FIG. 2, pellets 4 of polyethylene terephthalate mixed with ethylene in the same
manner as in Example 1, ethylene-vinegar and belet 5 (internal loss 0.2) were extruded with an
extruder. At the same time, extrusion lamination was carried out to make a composite film 6 of
polyethylene terephthalate and ethylene vinegar. Is this composite film polyethylene
terephthalate 7)?
At 50μ the ethylene vinyl acetate film is 20μ. The composite film was softened at 17 ° C. and
crystallization was promoted to produce a 6 CTn cone-shaped diaphragm. The following table
shows the elastic modulus and internal loss of the above Examples 1 and 2. In the above
Examples 1 and 2, polyethylene terephthalate is mixed with polyethylene terephthalate.
However, not limited to polyethylene, polypropylene etc. The olefin resin of the present invention
may be mixed. Further, as a material for laminating a non-oriented film composed of
polyethylene terephthalate and polyethylene, there are a woven fabric, a non-woven fabric or a
thermoplastic film made of organic synthetic fibers, or a blend of organic synthetic fibers and
natural fibers and inorganic fibers. When the composite film is softened at 160 ° C. to 180 ° C.
to promote crystallization as in the second embodiment, the elastic modulus is improved. As
described above, according to the present invention, the physical properties of polyethylene 5page terephthalate are impaired, and it has the advantage of being able to be directly laminated
to other material having a large internal loss.
4. Brief Description of the Drawings FIG. 1 is a schematic view showing a manufacturing process
of a speaker diaphragm in one embodiment of the present invention, and FIG. 2 is a schematic
drawing showing a manufacturing process of another embodiment of the present invention. . 1
...... T-die, 2 ...... unstretched film, 3 ...... polyester spunbond, 6 ...... composite film O Attorney name
Attorney Toshio Nakao One more person Figure 1 EndPage: 2
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