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JPH07107591

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DESCRIPTION JPH07107591
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
damping cloth for a speaker used in an acoustic output device or the like.
[0002]
2. Description of the Related Art In recent years, in the audio-related industry, with the
digitization of reproduced music sources, the speaker as an audio output device is desired to
have higher sound quality than ever before.
[0003]
The braking cloth for speakers conventionally aims to provide resistance to the diaphragm to
control the resonance frequency Q0 by suppressing the flow of air from the back of the
diaphragm, but the air flow is uneven. In this case, there arises a problem that constant acoustic
characteristics can not be obtained.
[0004]
SUMMARY OF THE INVENTION In the damping cloth for a speaker made of non-woven fabric,
which has been widely used in the prior art, the constituent fibers are randomly arranged, and
hence the aperture ratio per unit area is not constant.
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For example, when handling a small level acoustic signal such as a micro speaker, the minute
change of the air flow rate exerted by the nonuniformity of the non-woven fabric can not be
ignored.
For this reason, Q0 in the acoustic characteristics is not stable, which has a great influence on the
sound quality.
[0005]
When a non-woven fabric is used for the damping cloth, a slight adjustment of the flow rate is
largely dependent on changing the area of the vent hole opened in the speaker unit main body
rather than the non-woven fabric due to a manufacturing problem. However, with this method, it
is necessary to change the design of the air vent every time the members constituting the unit
are changed, or it is difficult to perform a comparison test in which Q0 is arbitrarily changed in
the audibility test. Lack of flexibility in
[0006]
SUMMARY OF THE INVENTION In view of the above problems, the present invention provides a
speaker damping cloth in which an arbitrary aperture ratio can be selected by the difference in
molding pressure using the same material, and the flow rate is always constant.
[0007]
[Means for Solving the Problems] In order to achieve this object, the speaker damping cloth of
the present invention has a lattice-like structure in which fibers formed by coating a
thermoplastic polymer resin on the surface are formed between the respective fibers. Only the
coating resin of the woven fabric is heated and melted so that the voids have a specific area
precisely, and the press pressure is adjusted so as to obtain an arbitrary opening ratio, and the
material solidified by cooling is used as a damping cloth It is.
[0008]
According to this configuration, the thermoplastic polymer resin coated on the fiber surface is
heat-pressed and melted at the time of molding and then cooled and solidified to maintain the
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binding strength between the fibers so as to form a uniform grid. To prevent misalignment of the
precisely woven cloth and adjusting the press pressure in the above steps, the necessary amount
of polymer resin is made to flow out to the grid formed between the fibers, and the air holes are
It can be set to any area.
Therefore, with the change of the speaker member, the required aperture ratio can be easily
adjusted.
In addition, due to the precision as the characteristic of the woven fabric, the flow rate is always
constant, so that a stable speaker with Q0 in acoustic characteristics can be obtained.
[0009]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The preferred embodiments of the
speaker damping cloth according to the present invention will be described below.
[0010]
The damping cloth for a speaker in one embodiment of the present invention is formed into a
required shape by compressing, heating and melting a woven fabric of precision weave of fibers
coated with a thermoplastic polymer resin on the surface in a mold and cooling and solidifying it.
It is molded.
The speaker damping cloth is attached so as to cover an air hole provided on the back surface of
the speaker unit.
[0011]
The operation of the loudspeaker configured as described above will be described below. The
speaker is composed of a vibration system such as a diaphragm, a voice coil bobbin, and a voice
coil, and a magnetic circuit system including a magnet, a pole, a plate, and a yoke. When a voice
current flows in the voice coil in a uniform magnetic field, a vertical electromagnetic force is
generated in the voice coil and vibrates according to the current. By correctly transmitting this
vibration to the diaphragm, it is emitted as a sound wave.
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[0012]
Next, a method of manufacturing a damping cloth for a speaker will be described. In the mold, a
woven fabric of polyester fibers coated with a low melting point polyester resin during spinning
is not melted or decomposed as a base material fiber. The film was heated to a temperature at
which only the low melting point polyester resin that has been filmed is melted, adjusted to a
pressure that produces an air hole having a specified flow rate, cooled and solidified, and formed
into a predetermined shape to obtain a damping cloth.
[0013]
As described above, according to the present embodiment, the woven fabric using the fiber
coated with the thermoplastic polymer resin is set to a temperature at which only the coating
resin is melted, and the heating and melting in the mold, the designated flow rate A speaker
using a damping cloth obtained by cooling and solidifying after adjusting to a pressure that
produces an air hole, a constant Q0 is obtained, compared with a damping cloth using a
nonwoven fabric of the same shape, It has become possible to significantly reduce the variation
in Q0.
[0014]
In addition, since the correlation between the opening ratio of the air holes and the pressure at
the time of molding was obtained, the opening ratio could be arbitrarily changed from 0% to
about 50% by adjusting the pressure.
[0015]
As described above, in the speaker diaphragm according to the present invention, only the coated
resin portion of the woven fabric of the fiber coated with the thermoplastic polymer resin on the
surface is heated and melted in the mold to form the air hole. After adjusting the open area ratio
by pressure and then cooling and solidifying it into a predetermined shape, it is used as a
damping cloth, and a uniform Q0 with no variation can be obtained while the forming process is
simple. And, by arbitrarily selecting a damping cloth having a different aperture ratio, Q0 can be
easily realized according to the request.
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