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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
loudspeaker component, and more particularly to a loudspeaker component made of paper, such
as an imaging plate, a center cap and a sub cone gasket. [Prior Art 1] As shown in FIG. 2, in a
typical speaker unit, a voice coil 3 wound around a bobbin 2 is located in an air gap of a
magnetic circuit 1, The cone diaphragm 4 to which is fixed has edges 5 at its periphery. It is fixed
to the speaker frame 7 through the gasket 6, and the bobbin 2 is fixed to the speaker frame 7 by
the damper 8. In this speaker unit, the diaphragm 4.1. Gaskets 6 and bobbins 2 etc. are often
made of pulp because they satisfy the characteristics on the material, that is, that the Young's
modulus becomes large, the density becomes small, and the internal penalty is appropriately
large, etc. There is. Furthermore, due to the recent demand for functional properties such as
waterproofness, and an appropriate surface gloss, heat fusion bonding of diaphragms, gaskets,
edges and center cap surfaces to thermoplastic resin films (lamination processing) It is carried
out by impregnating with a resin or by spraying with a resin base spray. [Problems to be solved
by the invention] However, when the thermoplastic resin film is preheated to soften and brought
into contact with the surface of the diaphragm or the like by vacuum pressure or pressure air,
the film itself is stretched and thin ( Therefore, it is necessary to use a slightly thick film, which
results in an increase in ml. Moreover, in the process by vacuum pressure or pressure air, it is
necessary to apply pressure uniformly, and when the applied pressure (negative pressure)
becomes uneven, the film may be wrinkled. Furthermore, structurally, the film itself is merely
superimposed on a paper diaphragm, and since the resin does not wet pulp fibers, a deep gloss
can not be obtained. When the speaker component is impregnated with a resin, the molecular
weight is adjusted to be soluble in an organic solvent, or a denatured resin is used, but the resin
penetrates into the inside of the stock, and a resin film is not formed on the surface. When
spraying resin, the solvents to be used can be roughly divided into organic solvents and aqueous
solvents. However, when spraying the resin using the former, the problem is that clogging
occurs, so first, the resin is paper The resin is to be sprayed after being impregnated with the
filler, but the resin must be impregnated until the space inside the stock is ditched to a certain
extent (usually 30 wt% to 40 wt% of the stock is required) Will be forced to increase weight.
In addition, resins using organic solvents are generally hard, and when used in diaphragms,
sharp cracks may occur due to rapid input or split resonance, and when using aqueous solvents,
so-called emulsion types Although it is possible to prevent the penetration of water to a certain
extent by attaching about 10% of a resin of the organic solvent type, which has a soft film and a
common sealing is possible, the biggest drawback is the base material Since it is paper, it is not
possible to prevent deformation in the drying process. [Means for Solving the Problems]
Therefore, according to the present invention, sealing with an organic solvent or an aqueous
solvent is performed on the speaker constituting member such as the diaphragm and the center
cap without weight increase. It is an attempt to solve the problems mentioned above. First, pulp
fibers, sizing agents, dyes and fixing agents are mainly used, and high density polyethylene fibers
called semi-chemical wood pulp and microfibers of thermoplastic resin such as polypropylene
fibers and acrylic fibers are included. Prepare a suspension. The paper is made into a
predetermined shape such as a diaphragm, center cap, etc., and it is dried by heating and
pressing using a mold, and the microfibers of the thermoplastic resin and the pulp fibers are
thermally fused. Then, a semi-finished product of the paper speaker component obtained is
impregnated with a solution of methyl acrylate, cellulose acetate butyrate or nitrocellulose to
give waterproofness. Furthermore, ethylene, a vinyl acetate copolymer emulsion, a vinyl chloride
emulsion, and an acrylonitrile-based emulsion are applied to form a resin layer on the surface.
Furthermore, in order to improve the surface of the speaker component, a paint of methyl
acrylate type, cellulose type or urethane type is applied as an organic solvent type paint to give a
deeper gloss. On the contrary, the surface gloss of the speaker component may be removed by
mixing a matting agent into the paint. [Embodiment] The embodiment of the present invention
will be described below with reference to the work flow chart shown in FIG. (1) Stock suspension
pulp fiber M NBKP 20 90 wt% microfiber high density polyethylene of 90 wt% thermoplastic
resin 10 wt% sizing agent 5 wt% dye to urea resin pulp Direct dye DAX Δ 4 wt% fixed to pulp
Agent 3% by weight to aluminum sulfate pulp (2) Paper making (3) Dry mold temperature 180 °
C Drying time 20 seconds Press pressure 3 kg / am2 (4) Immersion impregnating solution A
methyl methacrylate 5 wt% t% En 47.5 wt% ethyl acetate 23.5 wt% methanol 24 wt%
impregnation solution B cellulose acetate butyrate 5 wt% toluene 47, 5 wt% ethyl acetate 13.5
wt% Methanol 24 wt% Impregnation solution Rrocellulose S wt% t% ene 67 wt% t% ethyl 15 wt%
MEK ') wt% IP Δ 4 wt% (5) Dry drying time ioo ° C hot air Drying time 5 minutes (6) Emulsion
coated ethylene vinyl acetate copolymer 10 wt% water 90 ++ wt% (7) drying drying temperature
60 ° C hot air drying time 15 minutes up to the point of waterproofing which is the object of
this invention While having a speaker component having a surface gloss and having a surface
gloss, the following steps are taken to further improve these surfaces.
(8) Paint application paint D polyester acrylic copolymer Swt% M E K 95 vt% paint E polyester
acrylic urethane copolymer S wt% M E K 95 wt% paint F methyl methacrylate 5 wt% t% en 47.5
wt% acetic acid Ethyl 23.5 wt% methanol 24 vt% (9) Drying drying temperature 100 ° C. Hot air
drying time 5 minutes The combinations in this example are as follows. (A) Impregnation solution
A Emulsion application (B) A Coating D (C) II A Coating E (D) A Coating B (E) Impregnation
solution B Emulsion application (To) B Coating D (G) llB Coating E (H) 〃 B paint F (s)
impregnation liquid C emulsion application (n) 〃 C paint D (ル) ll C paint E (ヲ) ll C paint F The
material values according to these examples are as follows. Young's modulus Internal loss
Propagation velocity X 10 ”tlyr + e, / cm 2 X 10 cln 7 s (a) 3.03 0,078 2 2.15 (b) 4.1! 4 0,0567
2,71 (C> 5,42 0.0737 2.55 (D) 2.83 0.0465 2,10 (E) 3.44 0.0832 2, 27 B) 3 0 79 0, 01112 2, 27
(G) 3. 90 0.09 γ 2 2, 10 (T) 3.0 10 5, 0 5 20 2, 10 (S) 3.2 3 0, 0 8 39 2, 20 (D) 4. 19 0.0703 2 ,
44 (ru) 5,04 0.0963 2.45 (ヲ) 3.12 0,0502, 2,18 The resulting speaker components have
excellent waterproofness, for example, an environment of 45 ° C., 95% RH Even after standing
for 48 hours, 20 ° C again Even when submerged in water for 24 hours, deformation was
Brief description of the drawings
FIG. 1 is a working process diagram for obtaining the present invention, and FIG. 2 is a half
sectional view of a conventionally known speaker unit.
Patent Assignee Pioneer Co., Ltd. Mogami Electric Co., Ltd. Attorney Attorney Kobayashi Noboru
Kotoe Patent Attorney Murai Good Practice 1Hidden
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