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JPS62193399

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DESCRIPTION JPS62193399
[0001]
The present invention relates to a vibratory support such as a cone-type speaker edge and a
damper. A dynamic electric cone type speaker as shown in the cross-sectional view of FIG. 6 has
been known conventionally. In such an eight-pole type speaker, the pole piece 2 is placed on the
central portion of the back plate 1 and the magnet 3 is placed on the periphery thereof. The play
1-4 is placed on the magnet 3 and forms a magnetic gap with the pole piece 2. A voice coil
bobbin 6 around which a voice coil 5 is wound is vibratably inserted into the magnetic gap, and
the voice coil bobbin 6 is supported by a damper 7. A cone type diaphragm 8 is coupled to the
voice coil bobbin 7 at its central portion, and a center cap 9 is crowned at its end. The periphery
of the opening of the cone-shaped diaphragm 8 is supported by the frame 11 via an edge 10. The
edge 10 is further secured to the frame 11 by a gasket 12. The lead wire of the voice coil is
connected to a terminal 14 provided on the side surface of the frame 11 through the tinsel wire
13. The vibrator support of the cone type speaker, that is, the edge 10 and the damper 7 are
mainly intended to support the vibrator of the diaphragm 8 and the voice coil bobbin 6'B.
Therefore, the cross-sectional shape of the edge is such that it is easy to move the diaphragm 8
in the front-rear direction, that is, in the direction of the double arrows F in FIG. 3 and suppress
movement of the diaphragm 8 in the direction perpendicular to the front-rear direction. Is
suitable. For this reason, generally, roll edges of cross-sectional shapes as shown in FIGS. 7 (a)
and 7 (b) or full-get-on edges of cross-sectional shapes as shown in FIG. 6 (C) are often used.
Further, as a cross-sectional shape of the damper, generally, a corrugation type which is
approximate to FIG. 7 (C) is often used. The material of the vibrator support is, for example, one
obtained by impregnating a cloth with a resin and heating and forming it, one obtained by
heating and forming a plastic thin plate, and one formed by heating and forming a foamed plastic
thin plate. Also, there are many cases where the diaphragm and the same month are integrally
molded with yellow. In any of the supports, the Tomie frequency characteristics, maximum input
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'JFi flow, distortion characteristics etc. of the speaker assembly are obtained. a) various materials
are selected and used. Among the supports of the vibrating body, the edges have a particularly
great influence on the distortion in the bass range of the loudspeaker and on the frequency
characteristics of the mid-high range. It is caused by the linearity with respect to the amplitude
as the spring of the edge and the natural resonance of the edge itself.
Generally, in order to suppress the resonance of the edge, as a first method, reducing the area of
the edge to reduce the radiant energy from the edge, as a second method, applying a damping
agent to damp the resonance of the edge, A third method is to use a material with a large internal
loss to suppress resonance, and a fourth method is to use a shape that is less likely to cause
natural resonance. Here, the reduction of the edge area by the first method is performed to
minimize the influence on the sound pressure frequency characteristics even if there is a
resonance at the edge, and the influence on the sound wave emitted from the diaphragm is small.
It is necessary to do it. In the second to fourth methods, the resonance of the edge itself is not
generated, and the resonance is suppressed by forming an application layer of a flexible polymer
material as a damping agent on the edge portion. It is. However, in the case of conventionally
used polymer materials, the hardness after drying is high, the viscosity is small, and the elasticity
is large, so that damping against resonance is not sufficient. In addition, there is a drawback that
the sound quality of the speaker changes in a short period of time because the change with time
of the polymer material is large. The third method described above is formed by molding a
rubber that causes a large internal loss, but the rubber edge has a drawback that it is difficult to
maintain its shape. The purpose of the Ill-Standing 1-claim is to solve the above-mentioned
drawbacks. The internal loss is large to reduce distortion in the low frequency range of the
speaker and flatten the sound pressure frequency characteristic, and the shape An object of the
present invention is to provide a speaker support for a speaker or the like, such as an edge,
which is easy to hold. The vibrator support for a speaker according to the present invention is
characterized in that an unvulcanized rubber layer is laminated on the surface of a woven or nonwoven fabric impregnated with a thermosetting resin solution and dried, and the mixture is
molded by heating and pressing. It is. Hereinafter, an embodiment of the present invention will
be described based on the following table and attached drawings. FIG. 1 (a) or C) shows an
enlarged sectional view of the roll edge of this embodiment. FIG. 1 (a) shows an edge in which an
unvulcanized rubber layer 2 is laminated on a cotton cloth layer 1 carrying a thermosetting resin.
FIG. 1 (b) shows a structure in which an unvulcanized rubber layer 2 is laminated on both main
surfaces of a cotton cloth layer 10 carrying a thermosetting resin. FIG. 1 (C) shows a structure in
which a non-vulcanized rubber layer is sandwiched between the cotton cloth layers 1 carrying a
pair of thermosetting resins and laminated. Phenol resin or melamine resin is used for such
thermosetting resin, and such unvulcanized rubber layer is composed of IR (isobutylene-isoprene
based synthetic rubber), NBR (acrylonitrile-butadiene copolymer rubber) or SBR (sulylenebutadiene copolymer). Use an unvulcanized rubber).
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FIG. 2 is a schematic cross-sectional view showing a method of manufacturing the present
embodiment. The continuous cotton fabric 10 is passed through a thermosetting resin layer
liquid bath 11 such as a phenol resin (FIG. 2 (a)), impregnated with a thermosetting phenol resin
in advance, and subsequently dried (FIG. 2) Fig. (B), for example, passing through the uncured
rubber solution bath 12 of IIR (Fig. 2 (C)), coating the main surface of the continuous cotton
fabric 10 with a rubber layer, and then drying (Fig. 2) After 2 (d), heat pressing is carried out
using a molding die 13 to form an edge shape (Fig. 2 (e)). Finally, the molded continuous cotton
fabric 10 is cut (FIG. 2 (f)) to obtain an edge 14 in which a thermosetting resin is applied to the
fibers to apply an unvulcanized rubber coating to both sides of the cotton fabric. it can. FIG. 3 is a
schematic cross-sectional view showing another method of manufacturing the present
embodiment. From a roll 20 of continuous cotton cloth and a roll 21 of a plate-like sheet of
unvulcanized rubber prepared in advance (FIG. 3 (a)), while overlapping the continuous cotton
cloth 10 and the rubber sheet 22 in parallel between a pair of pressure rollers 23 3 (b)), and heat
pressed using a molding die 13 to form an edge shape (FIG. 3 (C)). The formed continuous cotton
cloth 10 is cut (FIG. 3 (d)) and the thermosetting resin is! An edge 14 can be obtained in which
an unvulcanized rubber layer is laminated on both sides of a cotton cloth adhered to lN. FIG. 4 is
a schematic cross-sectional view showing still another method of manufacturing the present
embodiment. The continuous cotton cloth 10 and the rubber sheets 1 to 22 are directly
introduced into the molding die 13 from the roll 20 of the continuous cotton cloth and the
unvulcanized rubber sheet 21 which have been used beforehand, and two sheets are laminated.
While pressing, heat pressing is performed to form an edge shape (FIG. 4 (b)). The formed
continuous cotton fabric 10 is cut (FIG. 4 (C)) to obtain an edge 14 in which a thermosetting
resin lffl an unvulcanized rubber layer on the both sides of the cotton fabric (= I attached to the
fiber) Can. FIG. 5 is a cross-sectional view of a mold 13 for roll edge, consisting of a male mold
having an annular projection with a semicircular cross section and a complementary female
mold. When the width of the physical property value of the edge obtained from the present
example and the conventional one is compared, the results as shown in the following table are
obtained. As a conventional example, an edge obtained by impregnating a cotton cloth with a
phenol resin, drying and heating and pressing, and an edge obtained by applying a damping
agent to the edge and drying it are described as comparative examples. As is clear from the table,
the edge of the present example can be impregnated into a cotton cloth and (3 of the
thermosetting resin, it is possible to change the physical properties widely compared to the
conventional edge by 3 of the thermosetting resin.
According to the present invention as described above, by making the v4 layer of the
unvulcanized rubber having a large internal loss and the woven fabric in which the peak of the
thermosetting resin to be attached is adjusted, the edge is made into an edge. The resonance can
be made to have a damping effect and the retention of the edge shape can be maintained over a
long period of time. In addition, since it is a vibratory support in which an unvulcanized rubber
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layer having a large internal loss and a woven or non-woven fabric to which a thermosetting
resin is easily adhered to which a shape can be easily maintained and whose hardness can be
easily adjusted are laminated. It is possible to achieve reduction and flattening of distortion in the
bass range of sound pressure frequency characteristics.
[0002]
Brief description of the drawings
[0003]
1 (a) or b) is an enlarged cross-sectional view of a roll edge according to the present invention,
FIG. 2 to FIG. 4 are schematic cross-sectional views for explaining the method of manufacturing
an edge according to the present invention, FIG. b) is a cross-sectional view of a molding die, FIG.
6 is a cross-sectional view of a cone-shaped speaker, and FIG. 7 is a schematic cross-sectional
view of a normal edge.
Description of the sign of the main portion 10 ...... cotton cloth 22 ...... unvulcanized rubber sheet
13 ...... molding die applicant Pioneer 3 iron top Denki
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