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The present invention relates to an acoustic diaphragm, and more particularly, to a composite
structural material used as a speaker diaphragm. As a diaphragm for a speaker, a composite
material obtained by laminating a molten film of an organic polymer on cellulose pulp paper is
known in the prior art, but the diaphragm made of this material causes a healing phenomenon in
the middle to high range and faithful reproduction Hate problems in terms of The present
invention proposes a novel acoustic diaphragm material with the above-mentioned problems,
which is a cell O-spalling layer and a fiber or flame of an organic polymer. A composite structure
in which the deposit layer or porous layer is mutually joined, and the layer of the organic
polymer is 10 to 200 parts by weight with respect to 100 parts by weight of the cell 0-spall layer
It is characterized by As a component of the cellulose pulp layer, a material comprising only
cellulose pulp such as kraft pulp, a material containing a suitable amount of flakes and fibers of
an organic polymer, and the like in the pulp are conventionally used as diaphragm materials for
speakers You can use paper that you Examples of the organic polymer include polyolefins such
as polyethylene, poly (D-pyrene), polypha) tendon-1, poly-4-methylpentene-1, polyanids such as
nylon, polyethylene terephthalate, and polyesters such as polybutylene phthalate. Polycarbonate
or other commercially available polymers of i are used, preferably with a density of 13 or less, in
particular 10 or less. The layer of organic polymer should be 10 to 200 parts by weight per 100
parts by weight of the layer of cellulose valve. If the amount is less than 10 parts, the effect of
the large pealing phenomenon # which is caused by a diaphragm made of only a cellulose pulp
layer is poor, while if it is larger than 200 MM, the cellulose pulp diaphragm is excellent. The
characteristic is 60 to 150 parts by weight per 100 parts by weight of the sound pressure layer.
In the present invention, the layer of the organic polymer is a low to high density non-woven,
paper-like, organic polymer sponge-like, foam having closed cells, and fibers of organic polymer
and / or flakes. It is essential that the porous material such as the sintered material of the green
body flakes. Although the effect of suppressing the peeling phenomenon of the cellulose pulp
paper is poor in the molten film of the organic polymer, the effect of preventing the bonding
phenomenon of the organic polymer becomes large. The fibers and flakes deposited in the form
of a paper may be 100 to 10 ′ ′ Gurley second / 100 CC paste density or may be ultra-high
The cellulose pulp layer and the organic polymer layer are bonded in such a way that the layers
do not separate due to vibration during use, but the organic polymer has a polarity such as boria
tride, polyester, etc., and thus adhesion is observed. When it is easy to do, it may be stuck using
any adhesive. As another method of bonding, it contains 1 to 150 parts by weight, in particular 3
to 80 parts by weight, of the flakes and fibers of the thermoplastic organic polymer exemplified
above as the cellulose pulp forming layer constituting material per 100 parts by weight of
cellulose pulp. On the other hand, a sheet of the thermoplastic organic polymer exemplified
above as a cloth machine polymer is used, and the sheet is stacked, pressurized and heated, and
the thermoplastic organic polymer component and heat present on the surface of the sheet of the
cellulose valve There is a method of thermally fusing a sheet of a plastic organic polymer and
joining the two sheets. This method is effective when the organic polymer to be used is
thermoplastic, but it is particularly difficult to make it less polar or nonpolar as in polyolefins and
difficult to bond with the use of ordinary adhesives. It is valid. In such a case, a mixed paper
made of a mixture of a polyolefin fiber and cell 0-svalp as a cell-swall sheet is particularly
preferable. The cellulose pulp layer and the organic polymer layer may be a combination of two
or more layers in any combination, and in particular, a six-layer structure in which cell 0-spar
layers are joined on both sides of the organic polymer layer is particularly preferable. In any
combination, the thickness of the sheet in each layer is, for example, 10 to 500 μ when using
the present invention as a speaker diaphragm, and 500 μm to several low for various acoustic
sound insulation boards and the like. The material of the present invention has, for example, a
thickness of 50 to 1000 μm or more depending on the purpose of use. Hereinafter, the present
invention will be described in more detail by way of examples and comparative examples.
EXAMPLE 1 A mixture of Kraft Pal 185 and polypyrrole fiber (thickness 18 μm, length 3 mm)
and 15 weights was mixed with a cylinder paper machine and had a basis weight of 40 to 7 m 2
and a thickness of about 100 μm. I got On the other hand, a polypropylene fiber sheet having a
fiber thickness of 5 μm and a basis weight of 709 / m and a thickness of about 300 μm
consisting of 0 pyrene fibers accumulated at the end is prepared, and the mixed paper is placed
above and below the sheet. It pressed under conditions of 180 ° C. and a pressure of 5 K9 / cmG to obtain a diaphragm material of 2001 tm in thickness with a bonding interface joined by
fusion of poly ': 50 pyrene fibers. Examples 2 to 4 and Comparative Example 1 In the same
manner as in Example 1, diaphragm materials of Examples 2 to 403 shown in Table 1 were
In the same table, a fused film (thickness 50 μm) of O pyrene base is pasted to each material of
Examples 1 to 4 and a conventional kraft, torn paper (thickness 100 μtn) as a comparative
example. The characteristics of the diaphragm made of a composite material are shown. Example
5 A 50 μm thick kraft pulp paper was laminated on both sides of a 90 μm thick non-woven
fabric (basis weight 76 S '/ m 2) using a thermosetting Evo resin resin adhesive to a thickness of
200 μm. The diaphragm material was obtained. Example 6 A 50 μm thick kraft pulp paper was
used on both sides of a 90 μm thick polyester non-woven fabric (basis weight 709 / m 2) and an
adhesive used in Example 5 was used to obtain a diaphragm paste of 200 μm thick. The Table 2
shows sound pressure-frequency characteristics. The vibration plate of the second comparative
example 1 has a frequency change of 10,00 OOHz 6 or the like, but the ones of Examples 1 to 6
all have uniform sound pressure values over a wide frequency range. It is understood that it has.
Patent Assignee Omura Takanori Daiko Denki Co., Ltd. Dainichi Nippon Electric Wire Co., Ltd.
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