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JPS59216395

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DESCRIPTION JPS59216395
[0001]
The present invention relates to an improvement of a diaphragm for a speaker, particularly a soft
dome diaphragm. Conventionally, soft dome diaphragms are formed into a dome shape by
impregnating a woven material made of natural fibers such as silk or synthetic fibers such as
polyester resin with a forming material such as phenol resin and epoxy resin, and heat pressing it
to form It was molded by applying a dump material such as an acrylic resin or by heat-pressing a
sheet impregnated with a filler material onto the woven fabric and coated with the dump
material. A plain woven fabric woven only by itself was used extensively. However, as a result of
the yarn being bent at the crossing portions, such a woven fabric acts as a combine and can not
sufficiently increase the rigidity of the formed diaphragm. In addition, since warp yarn and
cotton yarn are crossed and knitted, it is difficult to form a diaphragm having a large curvature
without causing deformation strain or the like in press molding, since the yarn displacement of
the intersection portion is small. The same applies to twill and satin weaves. Therefore, the
present invention is intended to provide a soft dome diaphragm having a large rigidity and a
large curvature by using a woven fabric having a special weave as a diaphragm substrate, and
the characteristic feature of the present invention is a warp yarn And a weft yarn arranged at
right angles in parallel without knitting, and a woven fabric knitted with a yarn in which the
intersection points of the warp yarn and weft yarn are arranged in a direction of about 45. The
following examples will be described in more detail. In FIG. 1, 1a and 11) are yarns in which 20
phase and half fibers are twisted, respectively, and 16 is a weft and lb is a warp. A plurality of
wefts 1a are arranged in parallel at appropriate intervals to constitute a weft group 11, and a
plurality of warps 1b, lb, contact with the upper surface of each weft 1a of the weft group,. The
warp group 21 is superimposed on each other. In this state, only the warp yarn 1b and the weft
yarn 1a are in contact with each other, and there is no shape 1 holding property as a woven
fabric. C is a binding yarn (10/1 m to 15 rl,...) Formed by twisting polyester J fiber, and the poly:
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r-s9 le Ka yarn is about 45 ° to the warp 1 b and weft 1 a They are arranged at an angle, and
the warp 11] and the weir (in the portion where the yarns cross at right angles along the
direction of extension of the polyester fiber yarn 1c, are woven by the polyester fiber yarn IC and
shape 1 as a woven fabric Is granted. Soaked in a 30 wt% phenolic resin solution as a vehicle
material on a silk woven fabric of 0, 59/100 crA, with the number of implanted wires 115/1 nch
thus obtained, and after pulling it up at 105 ° C. Dry for about 10 minutes.
Next, a 60 wt% acrylic resin solution was coated by a knife coater as a dump material, and dried
at about 105 ° C. for 10 minutes to obtain a 1.2 f / 7100 cal resin-coated cloth. This coating
was press molded for about 30 seconds with a heating mold at 180 ° C. to 190 ° C. to obtain a
dome-shaped diaphragm (diaphragm A) with a diameter of 25 + I + m1 and a total height of 7.5.
On the other hand, as a comparative material, when only the silk yarn was plain-woven, the same
treatment as described above was applied to the weave / li to obtain a dome-shaped diaphragm
(diaphragm B) having the same shape to rqtms-s. As is apparent from the upper surface of the
test specimen, the dome outer peripheral flat 1 portion obtained after press forming the domeshaped diaphragms A and B is evident, the diaphragm according to the present invention and the
diaphragm using the conventional plain woven fabric as a base material Although the internal
loss decreased slightly (about 1%), the Young's modulus could be increased by about 18%. It is
considered that this is because the rigidity is increased by holding a linear shape without bending
the dispersion which is the substrate of the diaphragm of the present invention. Next, a speed
incorporating the diaphragms A and B. The frequency characteristics of the car are shown in FIG.
As apparent from the figure, the frequency characteristic a of the speaker equipped with the
diaphragm A of the present invention is 2.000) 1z to 3000 Hz so-called middle as compared with
the frequency characteristic of the speaker equipped with the conventional diaphragm. The
valley of the sound decreased, and the reproduction high frequency band limit frequency fH was
further raised, and the reproduction bandwidth could be expanded. As described above,
according to the present invention, there is provided a speaker business trip moving plate having
at least a woven fabric made of natural or synthetic fibers and a shaping material as a basic
material, wherein the woven fabrics are plurally arranged in parallel with appropriate intervals. A
warp 2 ′ ′ f 21 comprising warps 1b, 1b,... And a weft group 11 comprising wefts 1a 11a,...
Juxtaposed orthogonally and juxtaposedly arranged in parallel with appropriate intervals, the
warp 1b It is characterized in that it comprises a binding yarn 1c which is arranged at an angle of
45 ° to the weft 1a and the portion where the weft 1a and the warp 1b cross at right angles,
and is a warp based on the i 'jll property of the diaphragm. Since the weft yarn is woven without
being bent, it is possible to provide a more rigid diaphragm without losing the Young's modulus
peculiar to the long fiber, and the perpendicular portion of the warp yarn and the weft yarn is
relatively loose. In the examples, in the examples, silk yarns were bound to the warp yarns 1b
and weft yarns 1a and polyester fibers were used to the yarn yarn 1c, but the same effect can be
obtained with other fibers, and the yarn binding yarns are also shown in the figure. As described
above, the present invention is not limited to passing X-shaped, and either one may be used.
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[0002]
Brief description of the drawings
[0003]
FIG. 1 is a perspective view of a degeneracy used for the diaphragm of the present invention, and
FIG. 2 is a frequency characteristic diagram of a speaker provided with the diaphragm of the
present invention and a conventional diaphragm.
21 is a warp group, 11 is a weft group, 1b is a warp, 1a is a weft, and c is a binding yarn.
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