close

Вход

Забыли?

вход по аккаунту

JPS5527725

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPS5527725
Description 1, title of the invention
Speaker diaphragm
3. Detailed Description of the Invention The present invention relates to a diaphragm for a
speaker based on a spunbond non-woven fabric made of long fiber filaments of organic synthetic
fibers, which is light in weight and has high rigidity and high internal loss. It is provided. In the
past, most diaphragms for speakers used paper or pulp made of paper pulp, but recently, metal
such as organic foam and aluminum has come to be used as a material to replace paper. The
However, in the former case, the elastic modulus is small, and in the latter case, the internal loss
is small and there are advantages and disadvantages. In order to improve the modulus of
elasticity of paper, those blended with inorganic fibers or organic fibers have also been proposed,
but the results have not been improved. In addition, conventionally, non-woven fabrics composed
of short fibers do not have sufficient rigidity to be formed into a non-woven fabric by forming
short fiber filaments of 3 to 5 mm, and furthermore, there is no elongation of the non-woven
fabric, and it is difficult to form a diaphragm. The present invention provides a speaker
diaphragm which can form a uniform random web with long fiber filaments and improve the
elastic modulus to join the filaments and control the thickness of the diaphragm. It is. The
organic synthetic fibers mean thermoplastic resins such as polyester, polyamide, polypropylene
and polyethylene. The thickness of the filament is desirably 5 denier or less, and when it is more
than this, the elastic modulus is also lowered on EndPage: 1, which is difficult to obtain a uniform
spunbonded nonwoven fabric. As a method of bonding a spunbond non-woven fabric by heat
bonding, there is a needle punch method or a heat roll method. The temperature of heat bonding
differs depending on each fiber, but the melting point of each fiber is desirable. Also, as the
polymer used as the binder, various resins such as acrylic, vinyl acetate, phenol, melamine,
10-05-2019
1
resorcinol-formalin and urea resin are used, but physical properties such as weight 1 elastic
modulus and rigidity of the diaphragm are binder It greatly depends on the concentration and
type of An embodiment of the present invention will be described below. As shown in FIG. 1, the
pellet of thermoplastic resin is supplied to the extruder 1, this resin is melted, this molten resin is
sent to the T die 2, and a long fiber filament of 3 deniers in thickness is fed from the T die 2 3
are fed to a roller 4 and the long fiber filaments 3 are entangled with the random to make a
uniform random web 5 of surface density 609 / m ". Next, needle punches, \: =, ..., a ('J' 8 ° 2 °
f 2 t t 7 '' '' DM * iTh needle 'F-y 79' A web is pierced, entanglement of long fiber filaments
Between the long fiber filaments 3 by heat fusion of the long fiber filaments while applying.
FIG. 2 shows a state in which the long fiber filament 3 is partially heat-sealed by the needle
punching method. In FIG. 2, 5 is a random web, and 6 shows a point heat-sealed by needle
punching. Next, the random web 5 is impregnated with a three-component binder of acrylic,
melamene and urea formalin (8: 1: 1), dried, and made to have an area density of 8 ° f! / M 'and
obtain a 400 .mu.m thick spunbonded nonwoven fabric. Next, a biaxially stretched polyethylene
terephthalate film (6 μ) coated with an epoxy resin was laminated on the above spunbonded
nonwoven fabric with a 150 ° C. heat roll to obtain a composite with an area density of 10097
m ′. Next, this composite was press-formed into a cone diaphragm shape by a heat press at 200
° C. The diameter of this diaphragm was 100 mm, a predetermined speaker was assembled, and
the frequency was measured in an anechoic chamber by JISBOX. FIG. 3 shows sound pressure
frequency characteristics of a speaker using the diaphragm for a speaker of the present
invention. In addition, this diaphragm has elastic modulus 1.4 × 10 10 dyn7, P, internal loss
0.030, sound velocity 1.9 × 10 2. c. The spacing between the needle punches should be regular.
Further, in order to further improve the elastic modulus, bonding of filaments by the heat roll
method is effective. The present invention is based on a spunbond non-woven fabric in which a
uniform random web is formed by long fiber filaments made of organic synthetic fibers as
described above, and according to the present invention, it is lightweight, highly rigid and highly
internal. It has the advantage that a lossy speaker diaphragm can be obtained.
4. Brief description of the drawings. FIG. 1 is a schematic view of a spunbond nonwoven fabric
manufacturing apparatus, FIG. 2 is a top view of a speaker diaphragm in an embodiment of the
present invention, and FIG. 3 is a diaphragm of the present invention. It is a sound pressure
frequency-characteristics figure of the used speaker. 1
·································································································································・ Random web. Name of agent
Attorney Nakao, Toshio Oo and others 1 EndPage: 2 Figure 2 2 2 2 2 2 20 f flff I Figure 3-Toko
Shiba □ religion () lz n EndPage: 3
10-05-2019
2
1/--страниц
Пожаловаться на содержимое документа