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DESCRIPTION JP2000004497

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DESCRIPTION JP2000004497
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker damper for use in various audio equipment and a speaker using the same.
[0002]
2. Description of the Related Art A conventional speaker and a damper for a speaker will be
described. FIG. 10 is a cross-sectional view of a conventional speaker, and according to the same
figure, 1 is a magnetic circuit composed of an upper plate 1a, a magnet 1b, and a lower plate 1c
having a center pole, and 2 is coupled to the magnetic circuit 1 3 is a diaphragm coupled to the
voice coil 4 whose outer periphery is coupled to the frame 2 via an edge portion and whose inner
periphery is fitted to the magnetic gap 1 d of the magnetic circuit 1; The speaker damper is an
outer periphery coupled to the frame 2 and an inner periphery coupled to the voice coil 4 to
support the voice coil 4 provided with the corrugation portion 5a between the inner and outer
peripheries.
[0003]
As a base material of the damper 5 for a speaker, first, a cotton yarn, an aramid fiber yarn, a
phenol fiber yarn as a base fabric, or a woven fabric in which a mixture of these is made into a
matrix, a phenol resin as a shaping material, A prepreg impregnated with a thermosetting resin
such as a melamine resin is used as a base material, and the base material is heated and pressed
into a desired shape in a heating mold and used as a speaker damper 5.
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[0004]
The base fabric of the base material used for the above-mentioned speaker damper 5 hardly
deforms even in the heating mold at the time of molding, and the shape as the speaker damper 5
is mainly shaped It is molded and held by the material.
In addition, since the phenolic resin, melamine resin, etc. used as an excipient material have low
affinity with the fibers of the above-mentioned base fabric, they are subjected to repeated
deflection or bending deformation, and are shaped to coat the surface of the base fabric. The
material can not follow the deflection of the flexible base fabric and causes crack fracture, and
the joint of the intersection points of the yarns of the fabric constituting the base fabric is
destroyed, and the rigidity as the speaker damper 5 is significantly reduced. There is a problem
in the aspect of stability of the quality of molding of the speaker damper to affect the problem in
the aspect and the flexibility of the damper 5 for the speaker.
[0005]
The present invention solves the above-mentioned conventional problems, and provides a
speaker damper for high input that has high durability, high stability in quality, high amplitude
for vibration, and high durability to vibration. The purpose is to
[0006]
SUMMARY OF THE INVENTION In order to solve the above problems, the speaker damper of the
present invention comprises a base fabric made of natural fibers or synthetic fibers impregnated
with a curable resin and heated to a desired shape. It consists of a pressure-formed first support
and a second support consisting of an elastic thin plate provided side by side with the first
support, the first support serving as a voice coil when the speaker is driven. In order to support
the voice coil by using the resilience of the elastic thin plate which is the second support against
the repetition of vertical movement while supporting to the left and right displacement, the
change of the minimum resonance frequency (fo) of the speaker It is possible to provide an
excellent speaker damper that can withstand a large amplitude with a very low durability.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION According to the first aspect of the present
invention, there is provided a first support formed by impregnating a base fabric made of natural
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fibers or synthetic fibers with a curable resin and molding it into a desired shape. And a second
support composed of an elastic thin plate provided adjacent to the first support, the first support
supporting the voice coil against lateral displacement, and Since the voice coil is supported by
using the resilience of the elastic thin plate which is the second support for repetition, the change
of the lowest resonance frequency (fo) of the speaker is very low, and the durability is good. It is
possible to provide an excellent speaker damper that can endure large amplitudes.
[0008]
According to a second aspect of the present invention, the base fabric made of natural fibers or
synthetic fibers is impregnated with a curable resin, and the elastic layer is further coated or
impregnated with the above base fabric, or a sheet is superposed thereon. According to the above
configuration, the speaker damper supports the voice coil against the lateral displacement when
the speaker is driven, and the elastic layer of the elastic layer is repetitively moved up and down.
Since the voice coil is supported using the resilience, it is possible to provide an excellent speaker
damper which can withstand a large amplitude even with a very low durability of the change of
the lowest resonance frequency (fo) of the speaker. It is possible to
[0009]
The invention according to claim 3 of the present invention is the second support according to
claim 1 or the elastic layer according to claim 2, an outer peripheral portion, an inner peripheral
portion, and a rib portion connecting them. And the second support can be very easily formed
with good productivity by printing or the like in the elastic layer and by punching in the second
support.
[0010]
According to a fourth aspect of the present invention, the first support and the second support
according to the first aspect are directly or indirectly joined only at the inner and outer
peripheral portions. In addition, they are provided so as not to interfere with each other at the
time of operation, and suppress abnormal noise generated due to the first and second supports
coming into contact with each other at the time of driving incorporated in the speaker.
[0011]
The invention according to claim 5 of the present invention is directed to claim 1 or claim 2 for
an elliptical or oval speaker having at least a major axis and a minor axis in a plan view at least in
the direction of vibration. The speaker damper as described above, wherein the width of the rib
portion on the long diameter side is made larger than the width of the rib portion on the short
diameter side, thereby suppressing rolling on the long diameter side where rolling easily occurs.
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[0012]
The invention according to claim 6 of the present invention is the second support according to
claim 1 or the elastic layer according to claim 1 comprising natural rubber, SBR rubber, NBR
rubber, urethane rubber, acrylic rubber , Silicone rubber, fluoro rubber, EPDM rubber, or at least
one of elastomers having at least an equivalent elasticity to these, and is heat resistant by acrylic
rubber, silicone rubber, fluoro rubber, EPDM rubber, and vulcanized rubber. It is possible to
provide a speaker damper having excellent characteristics, and by using natural rubber, SBR
rubber, NBR rubber, urethane rubber, and acrylic rubber, it is possible to improve input
resistance characteristics by virtue of these good resilience.
[0013]
According to the seventh aspect of the present invention, the second support according to the
third aspect is formed by injection molding, and there is no remaining portion due to punching,
so improvement in utilization efficiency of resin is achieved. It can be done.
[0014]
The invention according to claim 8 of the present invention is described in any one of claims 1 or
2 or 3 or 4 or 5 or 5 or 6 or 7 The speaker damper is used to form a speaker, and the speaker
damper is disposed and mounted so as to provide a space having a connection with the outside
up and down, so that the up and down movement of the voice coil is not impeded. It is possible to
provide a speaker of good quality.
[0015]
An embodiment of a speaker damper according to the present invention will be described below
with reference to FIGS. 1 to 9.
The same parts as those of the prior art are given the same reference numerals and the
explanation thereof is omitted.
[0016]
Embodiment 1 FIG. 1 is a cross-sectional view of a speaker according to an embodiment using
the speaker damper of the present invention, and FIG. 2 (a) is an embodiment of molding of the
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speaker damper of the present invention. 2 (b) is a top view of the second support, which is the
main part, FIG. 2 (c) is the same cross-sectional view, and FIG. 2 (d) is the same main part. 2 (e) is
the same sectional view, FIG. 3 shows the same hysteresis curve, and FIG. 4 (a) is a sectional view
of the developed example, FIG. (B) is the same half top view.
[0017]
In the same figure, 5A is a speaker damper, the inner and outer circumferences of which are
coupled to the voice coil 4 and the frame 2, respectively.
[0018]
The speaker damper 5A is composed of a first support 5A1 and a second support 5A2, and the
first support 5A1 is the same as the conventional speaker damper except that the cross section is
a roll. The material and formation method are similar.
The second support 5A2 includes an outer peripheral portion 5A2a, an inner peripheral portion
5A2b, and a rib portion 5A2c connecting them, and is integrally formed by punching a rubber
elastic sheet which is an elastic thin plate in a substantially handle shape. .
[0019]
The first support 5A1 is formed in a roll shape in cross section because the first support 5A1 and
the second support 5A2 are formed by the vertical movement of the voice coil 4 when
incorporated into a speaker and driven. The purpose is to reliably separate the two components
except for the junctions with the frame 2 and the voice coil 4 on the inner and outer peripheries
of the two for the purpose of suppressing occurrence of abnormal noise due to contact. For
example, a conventional corrugation may be used.
[0020]
Table 1 shows the results of comparison of changes in resonant frequency (fo) by continuously
applying 5 W or 10 W white noise by incorporating the speaker damper of the above
embodiment and the conventional one into a speaker. 3 shows the hysteresis curve of the
speaker damper alone.
[0021]
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5
The conventional speaker damper is made of cloth, and the dimensions are inner diameter 14
mm, outer diameter 35 mm, roll radius 4 mm in donut shape, and a 16 × 4 cm elliptical speaker
is manufactured. The speaker damper of the above embodiment is manufactured using the
conventional speaker damper as a first support and the second support punched out of
chloroprene rubber made of a material of 0.3 t, and the above-described conventional damper A
16 × 4 cm elliptical speaker was produced in the same manner as in (The shape of the damper
for the speaker was roll shape or corrugation shape, so the same reliability results are obtained,
so the roll shapes are compared here. ).
[0022]
[Table 1]
[0023]
As described above (Table 1), it was confirmed that the embodiment of the present invention is
excellent in all of the durability, heat resistance and moisture resistance.
[0024]
Further, as apparent from FIG. 3, it has been confirmed that the speaker damper 5A of the above
embodiment withstands a displacement of up to 3.0 mm and a load of up to 120 g in a linear
manner.
In addition, it has a role of controlling the speaker amplitude with respect to the vibration load
for a load input of 120 g or more.
It is apparent that this is because the rubber elastic body of the second support 5A2 punched out
of rubber exhibits its effect.
[0025]
The speaker using the speaker damper of the conventional product is significantly deformed at a
displacement of 2.0 mm or more, and it becomes difficult to return to its original shape.
[0026]
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As is clear from FIG. 3, it was confirmed that the load resistance of the above embodiment was
improved by about three times or more, and the input load resistance was significantly improved
over the conventional one.
[0027]
FIGS. 4 (a) and 4 (b) show an example of expansion of the speaker damper according to the
present embodiment, wherein a conventional speaker damper 5 having a corrugation shape is
used as the first support 5A1. The support 5A2 used in the present invention is obtained by
punching out the rubber elastic sheet shown in FIG. 2 (b), and these are used in combination.
[0028]
Accordingly, since the first support 5A1 has a corrugation shape in cross section, it is necessary
to consider the distance from the second support 5A2. However, as the speaker damper 5, the
first support 5A1 is used. Can be used to improve productivity.
[0029]
In the above embodiment, the rubber elastic sheet of the second support 5A2 is made of
chloroprene rubber, but natural rubber, SBR rubber, NBR rubber, urethane rubber, acrylic rubber,
silicone rubber, fluororubber, EPDM rubber or It may be composed of any one or more of
elastomers having at least the same level of elasticity, and particularly, a damper for a speaker
having excellent heat resistance is provided by acrylic rubber, silicone rubber, fluororubber,
EPDM rubber, and vulcanized rubber. It is possible.
[0030]
(Embodiment 2) FIG. 5 shows a top view of a second support, which is a main part of an
embodiment of a speaker damper used in an elliptical speaker according to another embodiment
of the present invention. It is a thing.
[0031]
According to the drawing, reference numeral 5B denotes a second support having an elliptical
shape, in which the width of the rib 5Ba on the long diameter side is larger than the width of the
rib 5Bb on the short diameter side.
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Thus, braking is applied on the long diameter side, and the balance between the long diameter
side and the short diameter side is adjusted to suppress rolling.
[0032]
(Third Embodiment) FIG. 6 (a) is a cross-sectional view of a speaker damper according to the
present invention, and FIG. 6 (b) is a top view of a second support which is the main part of the
damper. 6 (c) is the same cross sectional view, FIG. 6 (d) is a top view of the first support which is
the same main part, and FIG. 6 (e) is the same cross sectional view.
[0033]
According to the drawing, the first support 5C1 has a roll shape in cross section and is similar to
the first support 5A1 of the first embodiment.
The second support 5C2 has an outer peripheral portion 5C2a, an inner peripheral portion 5C2b,
and a rib portion 5C2c connecting them, and has a substantially handle shape, and the rib
portion 5C2c follows the roll shape of the first support 5C1. It is swollen and formed by injection
molding of EPM rubber injection molding resin.
[0034]
Furthermore, the first support 5C1 and the second support 5C2 are bonded together by bonding
or the like, and they are combined so as not to interfere with each other.
[0035]
The second support 5C2 formed as described above is formed by injection molding, and unlike
punching, no punched part is generated, and the use efficiency of the resin material is improved,
and the first and second supports are formed. Since the supports 5C1 and 5C2 can be handled as
one speaker damper, the working efficiency can be made equal to that of the conventional one.
[0036]
Although the EPM rubber is used as the resin for injection molding in the above embodiment, as
long as it is an injection-moldable resin having elasticity, an olefin-based elastomer resin, a
styrene-based elastomer resin, and a polyester-based elastomer resin are suitably used. It is good
to choose from etc.
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[0037]
(Embodiment 4) FIG. 7 (a) is a cross-sectional view of a speaker damper according to another
embodiment of the present invention, and FIG. 7 (b) is a top view of the same. FIG. 8 is a plan
view of the elastic layer which is the main part, and FIG. 8 is a top view of the elastic layer which
is the main part of the speaker damper.
[0038]
Referring to the same figure, only differences from Embodiment 1 will be explained. 5D is
applied to a cotton yarn, aramid fiber yarn, phenol fiber yarn, or a woven fabric in which these
mixed yarns and the like are matrixed as a base fabric. A speaker damper formed using a prepreg
impregnated with a thermosetting resin such as a phenol resin or a melamine resin as a base
material as a base material, and superposing a chloroprene rubber sheet punched into a
predetermined shape and heating and pressing it. is there.
[0039]
An elastic layer 5D1 is integrated with the above base material formed of the chloroprene rubber
sheet, and the outer peripheral portion 5D1a and the inner periphery are similar to the elastic
thin plate 5A2 which is the second support of the first embodiment. It has a substantially handlelike shape including a portion 5D1b and a rib portion 5D1c connecting them.
[0040]
Unlike the first to third embodiments, the speaker damper 5D of the present embodiment is
integrated by molding, so that the generation of abnormal noise due to the contact of the first
and second supports is avoided. It is not necessary to secure an interval for prevention, and the
speaker can be made thinner.
[0041]
Further, as means for superposing the elastic layer 5D1 on the substrate, chloroprene rubber is
dispersed in a liquid other than heat and pressure forming of the rubber elastic sheet, and this is
applied for printing, impregnation for immersion, etc. It may be performed by the known
formation method of
[0042]
Incidentally, as the elastic layer 5D1, any one or more of natural rubber, SBR rubber, NBR rubber,
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urethane rubber, acrylic rubber, silicone rubber, fluororubber, EPDM rubber, or an elastomer
having at least an equivalent elastic strength to these may be used. It is considered that acrylic
rubber, silicone rubber, fluororubber, EPDM rubber, and vulcanized rubber can be used to obtain
those having excellent heat resistance.
[0043]
FIG. 8 shows a developed example of the present embodiment, wherein an elastic layer 5E1
corresponding to the second support 5B of the second embodiment is applied on a substrate in
the same manner as the elastic layer 5D1 described above. The elliptical speaker damper 5E (not
shown) is formed by a method.
[0044]
In the elastic layer 5E1, the width of the rib 5Ea on the long diameter side is made larger than
the width of the rib 5Eb on the short diameter side.
Thus, braking is applied on the long diameter side, and the balance between the long diameter
side and the short diameter side is adjusted to suppress rolling.
[0045]
(Fifth Embodiment) FIG. 9 is a cross-sectional view of a speaker according to an embodiment of
the present invention, and 5D is a damper for a speaker described in the fourth embodiment. The
inner circumference is coupled to the voice coil 4 to support the voice coil 4.
[0046]
Reference numeral 1c denotes a lower plate constituting the magnetic circuit 1. A through hole
1e is provided in the lower plate 1c, and an elastic layer 5D1 formed of rubber of the speaker
damper 5D is passed through the speaker damper 5D. In order to prevent the passage of the air
from being restricted and the vertical movement of the voice coil 4 during the operation of the
speaker being prevented, the air in the lower part of the speaker damper 5D escapes outward.
[0047]
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Since the upper portion of the speaker damper 5D is generally open to the outside, such air
escape means is not provided unless it is particularly close.
The size of the through hole 1e may be appropriately selected depending on the occupied state
of the elastic layer 5D1 formed in the speaker damper 5D and the degree of air passage of the
base material of the speaker damper 5D.
[0048]
As described above, the speaker damper of the present invention has the first support formed by
impregnating the base fabric made of natural fibers or synthetic fibers with the curable resin and
heat-treating it into the desired shape. The second support consisting of an elastic thin plate
juxtaposed to the first support, and the first support supports the voice coil against the lateral
displacement when the speaker is driven; For repetition, the voice coil is supported using the
resilience of the elastic thin plate, which is the second support, to reduce the change of the
lowest resonance frequency (fo) of the speaker. Can also provide an excellent speaker damper
that can withstand the
[0049]
Brief description of the drawings
[0050]
1 is a cross-sectional view of a speaker according to an embodiment using the speaker damper of
the present invention
[0051]
FIG. 2 (a) is a cross-sectional view of an embodiment of the present invention for forming a
damper for a speaker.
[0052]
Fig. 3 Same hysteresis curve
[0053]
Fig.4 (a) Cross section of the same development example
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[0054]
5 is a top view of the elastic layer of the speaker damper which is an essential part of the other
embodiment
[0055]
FIG. 6 (a) is a cross-sectional view of a speaker damper according to another embodiment of the
present invention.
[0056]
FIG. 7A is a cross-sectional view of a speaker damper according to another embodiment of the
present invention.
[0057]
Fig. 8 Top view of the elastic layer of the speaker damper according to the other embodiment
[0058]
9 is a cross-sectional view of an embodiment of the speaker of the present invention
[0059]
Fig. 10 Cross section of the conventional speaker
[0060]
Explanation of sign
[0061]
DESCRIPTION OF SYMBOLS 1 Magnetic circuit 1d Magnetic gap 2 Frame 3 Diaphragm 4 Voice
coil 5A1 1st support 5A, 5B 2nd support 5A2a, 5D1a Outer peripheral part 5A2b, 5D1b Inner
peripheral part 5A2c, 5D1c Rib 5Ba, 5Ea Long side rib 5Bb, 5Eb Short diameter side rib 5D1,
5E1 Elastic layer
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