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1 /-Description 1, name of the invention
Speaker diaphragm
3. Detailed Description of the Invention The present invention provides a speaker diaphragm
having a large elastic modulus and a large internal loss. The conventional speaker diaphragm is
mostly a paper cone. This is because the paper maintains the proper elasticity, and the proper
internal loss necessary for the speaker diaphragm. On the other hand, recently, metals such as
organic foam and aluminum have been used as materials to replace paper cones, but these
materials have larger internal loss only than paper cones, only elastic modulus is larger than
paper cones, and others One was always lower than the paper cone. Therefore, the use as a
diaphragm was limited. For this reason, although an organic fiber and an inorganic fiber are
mixed in a paper cone and an elastic modulus is improved, it is a reality that it is not so effective.
The present invention is to improve formability, elastic modulus and internal loss by adding
wood powder or cellulose powder to synthetic pulp made of thermoplastic resin. Conventionally,
it has been practiced to mix synthetic pulp into paper cones to improve physical properties, but
the elastic modulus and internal loss have hardly been improved either. Also, the formability is
not improved. In general, synthetic pulp contains 50 wt% or more. As used herein, synthetic pulp
refers to fibrillated fiber EndPage: 134 ° made of thermoplastic resin such as polyethylene /
polypropicin and nylon. The fiber length of wood pulp used for paper corn is relatively long,
about 3 or more, but the term "cellulose powder" as used herein means less than that. Moreover,
the inorganic fiber to be mixed means carbon fiber, glass fiber and the like, and the organic fiber
means aromatic boria tin fiber and the like. Generally, when forming a diaphragm made of wood
pulp and synthetic pulp into a cone shape, deep drawing can not be performed, and it has been
necessary to make a paper with a cone shape paper machine. However, when wood powder or
cellulose powder is used, deep drawing is possible with the composite sheet as it is, and the
molding process is simplified. The feature of the present invention is an elastic modulus equal to
or more than a mixture of wood pulp and synthetic pulp. In addition to showing internal loss, the
formability is to be greatly improved. The elastic modulus E of the composite diaphragm made of
wood pulp 7 o and synthetic pulp 30 is E−1, 5 × 10 10 dyn / cd, and the internal loss tan δ is
tan δ− 0, 035. Examples are shown below. [Example 1] The powder was mixed at 70:30, and a
composite sheet was made on a trial basis by the usual sheet-forming method (weight 120 y /
rr?). The composite sheet is heated to a temperature above the melting point of the synthetic
pulp, and cold press-formed to form a cone shape.
The elastic modulus E of this diaphragm was E = 1.7 × 10 d7 n / cd, and the internal loss tan δ
was tan δ = 0.045. Example 2 A synthetic pulp 50 made of high density polyethylene, wood
flour 30, and aramid fibers (fiber length 2 m) 20 were mixed, and a diaphragm was made in the
same manner as in Example 1. The elastic modulus and the internal loss of this example were E =
2, Ox10 dyn / cd, and tan δ = 0.040. Although wood flour is used in Examples 1 and 2 above,
not only wood flour but natural cellulose powder such as cotton flour may be mixed with
synthetic pulp. In addition, synthetic resin powder such as nylon powder was not effective. The
present invention is configured as described above, and has the advantages of enabling deep
drawing and improving the elastic modulus and the internal loss. EndPage: 2
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