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DESCRIPTION JPH09154200

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DESCRIPTION JPH09154200
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
damper for a speaker used in various kinds of audio equipment, and more particularly to a highly
rigid damper made of woven fabric.
[0002]
2. Description of the Related Art In the manufacture of a speaker, a damper for achieving correct
holding and vibration of a diaphragm is generally made of a cloth material consisting of a very
simple plain weave in which a warp yarn and a weft yarn cross each other. It is done. However, in
this plain weave fabric, as shown in FIG. 2, the directions e-e 'and f-f' at 45.degree. With respect
to the warp a and the weft b are structurally weak against bending in this direction, Although
vibration distortion of the diaphragm causes the sound quality to deteriorate, and the occurrence
of a gap defect due to the occurrence of a rolling phenomenon, it has many problems, although it
is inexpensive.
[0003]
In order to solve these problems, in JP-A-1-123598, a diaphragm is formed by molding a first
material disposed radially and a second material disposed substantially orthogonal to the first
material. A damper has been proposed in which the flexibility in the radial direction to be
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transmitted is made uniform to prevent the occurrence of vibration distortion. Further, in
Japanese Patent Laid-Open No. 3-97398, the structure of the damper is composed of radial
direction yarns and circumferential direction yarns, and the radial direction yarns are stiff and
elastic yarns, and the circumferential direction yarns are hard. Loudspeakers have been proposed
that achieve high fidelity reproduction and high linearity by using a strong thread.
[0004]
The damper described in JP-A-1-123598 arranges a plurality of warps in the central axis
direction of a voice coil and distributes a plurality of wefts concentrically with respect to the
central axis. Then, when braiding up in a bellows-like manner, the constriction part is made a
diameter equivalent to the voice coil aperture, the maximum diameter part is regulated to a
diameter equivalent to the maximum outer diameter of the damper, and then this is cut at
predetermined sites successively After the impregnation, it is further heat-formed into a
corrugated section, and its production method is very special.
[0005]
On the other hand, the damper described in Japanese Patent Application Laid-Open No. 3-97398
uses a yarn which is very soft and stretchable such as polyamide resin fiber yarn as a radial
direction yarn, and uses a hard and strong yarn as a circumferential direction yarn. Since each of
the dampers is a cloth material other than the plain-woven fabric material, there are problems in
terms of practicality and problems in productivity and cost.
[0006]
In view of the current situation, the present invention makes the rigidity in the circumferential
direction substantially uniform by improving the rigidity in the 45.degree. Direction with respect
to the warp and weft of the plain-woven material conventionally used as a damper material. It is
an object of the present invention to provide a speaker damper.
[0007]
[Means for Solving the Problems] In order to achieve the above object, in the speaker damper of
the present invention, a plain-woven material in which a warp and a weft cross at right angles is
used as a damper base material. The sewing machine is characterized in that a sewing thread is
sewn in along the direction of 45 °.
[0008]
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DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, the
damper base is basically made of a plain-woven material in which a warp yarn and a weft yarn
cross each other.
Since the rigidity of the direction of 45 ° with respect to the warp and weft is weaker in the
direction of the warp and weft with respect to the warp and weft, the rigidity of the damper
substrate in the circumferential direction becomes substantially uniform in this 45 ° direction.
As in sewing sewing thread.
In addition, as long as it is a cloth material in which the warp and the weft cross at right angles, it
is not necessarily limited only to the plain weave, and may be a twill weave.
[0009]
There is no particular limitation on the sewing thread to be sewn to the damper base material,
but it is preferable to use a rigid sewing thread such as a cotton thread or a polyamide thread.
Also, when sewing the sewing thread in the 45 ° direction with respect to the warp and weft,
change the shape of the seam and the width of the seam from the attachment hole formed in the
center to attach the voice coil bobbin. For example, it may be sewed in straight, zigzag or even
curvilinearly.
In addition, sewing of sewing threads into the damper base material may be performed by sewing
a plurality of sewing threads in parallel even if one sewing thread is sewn in the 45 ° direction
with respect to the warp and weft, or The threading amount may be further changed by changing
the thread thickness. Of course, the above-described matters may be implemented alone or in
combination as appropriate.
[0010]
The impregnation of thermoplastic resin such as phenol resin to the damper base material may
be before or after the sewing of sewing thread, but basically, the thermoplastic resin is used for
the damper base material. After impregnating and using semi-dried condition, sewing thread is
sewn into 45 ° direction to warp and weft, then the whole is heat-formed to form concentrically
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corrugation on the damper base material It is a damper.
[0011]
Since the damper for a speaker according to the present invention has the sewing thread sewn in
the direction of 45 ° with respect to the warp and weft in the damper base material made of
plain woven material, the strength against bending in the circumferential direction of this portion
It can be improved.
[0012]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The preferred embodiments of the
speaker damper according to the present invention will be described in detail with reference to
the attached drawings.
In the speaker damper 1 of the present invention shown in FIG. 1, a plain-woven material of a
required size is impregnated in a phenol resin to make it semi-dry, and then the voice coil bobbin
is held at the central portion formed by punching. The sewing thread 4 is sewed in a zig-zag
fashion from the inner circumference to the outer circumference at the mounting hole 2 position
so that it is oriented 45 ° to the warp and weft, and then the plain weave material is heated and
It is pressure-molded to form corrugations concentrically, and then the mounting hole 2 and the
outer periphery 5 are punched out to form the damper base 3.
[0013]
According to the speaker damper of the present invention, the sewing thread is sewn into the
damper base material made of a plain-woven material so as to have a 45 ° direction with
respect to the warp and weft, so the circle of this portion The strength against bending in the
circumferential direction can be significantly improved, and the rigidity of the damper itself can
be made uniform with respect to the entire circumference. As a result, the rolling as a speaker
can be suppressed and the f0 change rate can be reduced.
In addition, since a very common cloth material called plain weave can be used, the production
cost of the speaker can be reduced, and an excellent damper can be obtained by an extremely
easy and easy means of sewing in sewing threads. The point is very practical.
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[0014]
Brief description of the drawings
[0015]
1 is a plan view showing an embodiment of a speaker damper of the present invention.
[0016]
2 is an explanatory view showing the relationship between the warp and the weft of the plain
woven material.
[0017]
Explanation of sign
[0018]
1 Speaker damper 2 mounting hole 3 damper base material 4 sewing thread 5 damper outer
circumference
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