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JPS60240298

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DESCRIPTION JPS60240298
[0001]
TECHNICAL FIELD The present invention relates to a speaker used for various audio devices. .
The structure of the conventional example and the problems thereof The edge for the speaker is
generally made of a foam urethane sheet as a material and an edge obtained from a material
having a cloth as a base and a rubber resin coated thereon. The speaker edge holds the outer
peripheral edge of the diaphragm in the correct position with respect to the frame, but has the
following drawbacks. First, the edge made of the urethane foam sheet has a large change with
time, and the problems with moisture resistance and weatherability remain, and when it is used
for car speakers or outdoor speakers, it is discolored by ultraviolet light and deteriorated due to
long time use Is a cause of the breakage problem because it is t-L. Also, in general, cloth edges
are coated with a rubber-based resin such as SBR or NBR on a cotton base cloth and finally
impregnated with a phenol resin, melamine resin or the like as a fo regulator to form an edge by
thermoforming processing. Was. In particular, for the purpose of workability and rationalization,
the resin layer of SBR and NBR uses heat reactivation to take advantage of its ability to reactivate
edge molding and edge and corn paper simultaneously by pressing and heating. Have been
implemented. However, since SBR and ?BR resins are inferior in heat resistance and weather
resistance, satisfactory results can not be obtained for outdoor speakers and car speakers. FIG. 1
shows a cross-sectional view of the speaker. In FIG. 1, a field portion 5 is constituted by a plate 2
provided with a center pole 1, a ring-shaped magnet 3 and a ring-shaped upper plate 4 and a
frame 6 is coupled to the field portion 6 The peripheral portion of the diaphragm 8 is fixed to the
peripheral portion of the frame 6 together with the gasket 7, and the middle portion of the
diaphragm 8 is supported by the damper 10 so that the intermediate portion is properly fitted
into the magnetic gap 9 of the field portion 5. The voice coil 11 is coupled, and a dust cap 12 is
attached to the central portion and the upper surface of the diaphragm 8. FIG. 2 shows a crosssectional view of the diaphragm, in which the diaphragm 8 is composed of a vibrating portion 13
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and an edge portion 14, and the working / nozzle portion 14 generally has a thinner edge
portion of the paper sheet. And, the free edge is divided into the urethane foam sheet and the
rubber sheet coated with rubber and then joined to the cone surface, Fig. 3 shows the fixed edge,
and Fig. 4 shows the free edge. However, the fixed edge is strong or weak as an input-resistant
edge, and a free edge is generally used as an on-vehicle or HiFi speaker or a high-input speaker.
In the above-described configuration, the conventional tools and tools are unreliable. As the
problem of the conventional example, SBR and NBR resin is used as a filler, so the weather
resistance and heat resistance are poor, and the diaphragm with a filler and using this filler has a
large change in fO, and the speaker sound quality It is a major cause of change. Such an edge has
a high fO and is very strong, so the edge material is fragile, which may cause breakage at the
time of driving the speaker. SUMMARY OF THE INVENTION The present invention solves the
above-mentioned conventional problems, and has a heat resistance and a weather resistance, a
good input resistance, a speaker using a simultaneous molding, simultaneous sticking, and a
commerce / noge. According to this method, it is possible to apply a tool and a blade to a cone
surface at the same time as forming an edge. In order to achieve this object, in the present
invention, in order to improve the reliability of the cloth edge and enable rationalization, it is
mainly composed of a resin layer excellent in weather resistance and heat resistance, and further
heat reactivation. It is a laminated resin. That is, a base resin is coated with a copolymer resin
layer of an acrylic resin and a urethane resin, an SBR or NBR resin layer is laminated on this, and
finally a molding process is carried out by phenol resin impregnation. The acrylic-urethane
copolymer resin layer is formed by dipping or coating. This resin layer is sufficiently crosslinked
by aging to improve reliability such as heat resistance and weather resistance, and then SBR as
an adhesive. Coat NBR resin. The coating may be in an amount sufficient to function as an
adhesive. Finally, a phenolic resin is impregnated, and the edge material having the above
configuration is pressurized and heated to simultaneously bond it to corn paper. According to
this configuration, it is possible to obtain a highly reliable filter cloth edge that can be
rationalized and has good weather resistance and heat resistance. DESCRIPTION OF THE
PREFERRED EMBODIMENT An embodiment of the present invention will be described below with
reference to the drawing of FIG. The entire configuration of the speaker is the same as that
shown in FIG. 1, so that the description here will be made only for the characteristic part of the
present invention. FIG. 5 shows essential cross-sectional views of the edge portion and the cone
portion of the present invention, in which 16 is a rubber layer mainly composed of SBR or NBR,
and 6D is a rubber layer mainly composed of acryl; In the resin layer, 17 is a cotton base fabric.
The base cloth 17 is impregnated with a phenol resin or a melamine resin, and 18 is a vibrating
portion. The manufacturing method of the cloth edge sheet used for this invention is
demonstrated. An acrylic-urethane copolymer mainly composed of an acrylic resin having good
weather resistance and heat resistance is coated on a cotton cloth (yarn count # 30 и number of
runs 90 О 8 B).
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The resin content is about 15 to 25% of the base fabric. To this is added an extender main
crosslinking agent to the acrylic-urethane copolymer resin layer in an amount of 2 to 5 to
perform aging. Aging is carried out until the acrylic-urethane copolymer is completely
crosslinked (about 1 month at normal temperature). Aging becomes good in heat resistance and
weatherability, and physical properties do not change. Next, about 4 to 1 o% of SBR or NBR resin
is laminated. Since SBR and NBR resins are thermally reactivated by pressure and heat, they are
mainly used as an adhesive with the cone. Since SBR and NBR resins have poor weather
resistance and heat resistance and large changes in physical properties, lamination of 10% or
more is not preferable. Finally, an edged sheet can be obtained by impregnating a phenolic resin.
By pressing and heating the above-mentioned sheet, a cloth edge of simultaneous molding and
simultaneous application can be obtained. Comparison of physical properties between the
product of the present invention and the conventional product (the base is the same) Content of
the product of the present invention 20% (wt%) SBR of acrylic-urethane copolymer as a filler
(coating layer) wt%) processing of laminated sheets. A conventional product, SBR, NBR mixed
resin is coated with 26 as an adhesive, and it is molded and processed. The phenolic
impregnation of the invention and the prior art is 15% (wt%) relative to the backing. ?
Comparison of heat resistance (1 'OO' CX 34 days) Permeability (7 /, l / sec) of edge before test
Appearance after invention Present invention less than 0.06 0.10 No change Conventional
product less than 0.06 75.0 Change (causes an erosion) f0 change (cone surface uses coated
aluminum foil) fo change is f of cone. Using a measuring device Before testing After testing rate
of change invention 46 Hz 58 Hz 26% Conventional 45H2165 H 2266% ? Humidity resistance
55 ░ C О 95 RM RM atmosphere 250 h after charging 4 changes before measurement Before
change Rate of change Appearance Inventive product 46Hz 38Hz 17 inches Low deformation
Conventional product 45Hz 33Hz 27% deformation (Etidare) ? Speaker fO change rate in
temperature change (16? ?) Invention edge used conventional edge used speaker 30 "C 45%
88 inch 10 ░ C22 Chi 44% ? 6% 16% 20 ░ C-40 'C 6% 6% 55 ░ C 7% 8- 85 ░ C 9% 1O 2
After leaving for 3Q minutes in each atmosphere Measure as above A speaker using the inventive
edge is highly reliable. Effects of the Invention As described above, since the speaker of the
present invention is configured, simultaneous molding and simultaneous sticking are possible,
and it is possible not only to be highly reliable but also to be rationalized, and the practical value
is increased.
[0002]
Brief description of the drawings
[0003]
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FIG. 1 is a cross-sectional view of a conventional speaker, FIG. 2 is the same cross-sectional view
of a diaphragm of a conventional speaker, FIG. 3 is a cross-sectional view of a diaphragm using a
confined edge, and FIG. It is sectional drawing of the principal part in one Example of a speaker.
6 field part, 6 frame, 7 gasket, 8 diaphragm, 9 magnetic gap, 1 ░
иииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии иииииииииииииииииииииииииииииииии Layers 16
иииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии Name of Agent
Attorney Nakao Toshio Other 1 person Figure 1 Figure 7 Figure 2 Figure 3 Figure 4 Figure 5
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