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JPS56109097

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DESCRIPTION JPS56109097
Description 1, title of the invention
Speaker diaphragm-method of manufacturing the same
3. Detailed Description of the Invention The present invention relates to a diaphragm for a
speaker and a method of manufacturing the same, wherein a foam sheet is used as a core
material and a surface material is laminated on the surface of the core material. The present
invention provides a diaphragm for a speaker, and a manufacturing method capable of
manufacturing the diaphragm continuously and at high speed, and further capable of uniformly
foaming a foam sheet. Snacks, high internal losses, high bending stiffness are desired. The
curvature of the diaphragm is related to the distortion of the speaker, the internal loss is related
to the flattening of the frequency characteristic of the speaker, and the weight is related to the
sound pressure. Conventionally, as a lightweight and high-curved speaker diaphragm, a
diaphragm in which an aluminum honeycomb material or a foam is used as a core material and a
surface material is bonded to the surface of the core material is known. However, since the
conventional speaker diaphragm uses an aluminum honeycomb material or a foam, it has an
EndPage: 1 defect that can not be manufactured continuously and at high speed. The present
invention eliminates the above-mentioned conventional drawbacks, can continuously produce a
diaphragm with a sand-in-ch structure continuously at high speed, and can produce a diaphragm
for a loudspeaker, which can uniformly foam a foam sheet The present invention provides a
diaphragm with more excellent characteristics, and one embodiment of the present invention will
be described below with reference to FIG. In FIG. 1, 1 is a surface material notebook as a surface
material, 2 is a core material sheet as a core material, and 1 surface material sheet 1 has a high
density polyethylene short fiber diameter of 10 μ? ? A sheet (sheet thickness 160 μm, softening
temperature 130 ° C.) of surface density = 8 oy / i made by mixing 20 wt% of 2 ° fiber length
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and 2 wt% of carbon fiber into a sheet, and core material--2 is mixed with a foaming agent Low
density polyethylene sheet (surface density 110 y / d, thickness 140 μm, softening temperature
105 ° C.). 3. The foaming temperature is 150 ° C. or higher, and one foaming ratio is 6 to 1
o). 3+3’tr! -A roller in which a heater is incorporated, 4, 4 '%% 556' is a molding die. As
shown in FIG. 1, with the facing sheet 1 superimposed on the surface of the core sheet 20, the
rollers 3,3 'are passed between the rollers 3, 3', the rollers 3, 3 'are heated to 120 ° C.,
Polyethylene as a base material of the core sheet 2 is melted, and the core sheet 2 and the facing
sheet 1 are welded. At this stage, since the foaming start temperature in the core sheet 2 is not
reached, the foaming does not occur and the polyethylene short fibers of the 1 facing sheet 1 are
not melted. By heating the rollers 3, 3 ', the composite sheet 6 consisting of the laminated core
sheet 21 and the facing sheet is heated by the heaters 4, 4' for several seconds with a heat of
180 ° C.
Because the foam in the core sheet 2 is heated to a temperature higher than the foaming start
temperature by the heating of the heaters 4 and 4 '. While foaming, the polyethylene short fiber
of 1 surface material sheet 1 and the polyethylene which is core material sheet 20 base material
will be in a molten state. The composite sheet 6 thus foamed and softened by the heater
4.degree. 4 'is cold-pressed by a die 5.degree. 5' and shaped into a diaphragm shape. The
thickness of the diaphragm can be adjusted by the clearance of the mold. The following table
shows respective physical property values of the above-described example and the conventional
paper cone. In addition, using the core sheet and the facing sheet similar to the above
embodiment, the first stage as in the above embodiment ". In the case where lamination and
foaming are performed simultaneously in the first stage without heating in the second stage, the
core notebook foams uniformly and causes foaming and contraction in one part, which can not
be used as a diaphragm there were. On the other hand, in the case where the core sheet and the
facing sheet are laminated in the first stage and the core is foamed in the second stage as in the
above embodiment, the core sheet can be uniformly foamed. In the above example, a core
notebook made of td and polyethylene as a base material, and a surface-# 7- containing
polyethylene short fibers are used, but polyethylene KI (a thermoplastic resin such as
polypropylene, etc.) is used. If it is used, the same effect as that of the above embodiment can be
obtained. Thermoplastic resin between the core sheet and the facing sheet: σ, the use of the
same one is inferior in terms of adhesion between the two sheets. As described above, according
to the manufacturing method of the present invention 6, it is possible to continuously
manufacture at high speed a diaphragm in which the surface material is laminated on one
surface of the uniformly foamed core material. For example, according to the manufacturing
method of the present invention, diaphragms can be manufactured continuously at a rate of one
in ten seconds. In addition, according to the production method of the present invention, a thin
diaphragm of 300 um or less can be manufactured while using 1 foam sheet. EndPage: 2 FIG. 2
shows sound pressure frequency characteristics of the speaker A using the diaphragm obtained
by the manufacturing method of the present invention and the speaker B using a conventional
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paper cone. As apparent from the above-mentioned clothes, the diaphragm obtained by the
manufacturing method according to the present invention is lighter in weight, high in internal
loss, and high in bending rigidity as compared with the conventional paper cone, so The speaker
using the diaphragm of the present invention is softer than that of the present invention, as is
apparent from FIG. 2 and shows a flat sound pressure frequency characteristic. As is apparent
from the above embodiments, the diaphragm of the present invention has an @ amount, a high
internal loss, a high bending rigidity, and a speaker using the diaphragm of the present invention
as compared with the conventional paper cone. For example, a flat sound pressure frequency
characteristic can be obtained.
According to the production method of the present invention, it has the advantage of being able
to produce a uniformly foamed diaphragm continuously and at high speed.
4, Brief description of the drawing Figure 1 is a failure 'one implementation of light? The
schematic of the apparatus which enforces the manufacturing method of the speaker diaphragm
in lJ, FIG. 2 is a sound pressure frequency characteristic of the speaker using the diaphragm of
this invention. 1 、、、、、、 表面 シ ー ト 、 2 ′ 、、、、、 材 13、3 、、、、、、、 ロ ー
ラ ー 4.4 ′ 、、、、、 、 ヒ ー タ ー タ ー, 5
5'1 . . 1. Mold, 6, ..., composite sheet. Name
of Agent Attorney Nakao and 1 other EndPage: 3
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