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TECHNICAL FIELD The present invention relates to a speaker used for various audio devices. The
structure of the prior art and the problems thereof The edge for a speaker is generally made of a
cloth as a base cloth, and an edge obtained from a material coated with a rubber resin has been
used. The speaker edge holds the outer peripheral edge of the diaphragm in the correct position
with respect to the frame, but has the following disadvantages. The cloth edge is formed by
thermoforming a sheet obtained by coating a cotton-based cloth with a rubber-based resin such
as 8BR or NBR and finally impregnating with a phenol resin or melamine resin as a Fo regulator.
The 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. As the SBR and
NBR resins are inferior in heat resistance and reconnaissance resistance, satisfactory results can
not be obtained for outdoor speakers, cars and scale speakers. FIG. 1 shows a cross-sectional
view of a general loudspeaker. In FIG. 1, a field portion 6 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 5. 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 upper surface of the central portion 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
and an edge portion 14, and the edge portion 14 is generally a fixed edge, in which an edge
portion of a paper sheet is thinned. After being processed into a rubber sheet coated fabric sheet,
it is divided into those bonded to the vibrating part. Fig. 3 shows a fixed edge, and Fig. 4 shows a
free edge, but the fixed edge The edge is weak as an input-resistant edge, and in general, a free
edge is used for a vehicle-mounted or Hi-Fi speaker and a high-input speaker. In the
configuration as described above, the conventional edge is unreliable. That is, as the problem of
the conventional example, SBR and NBR resin are used as a filler, so that the edged diaphragm
using this filler has poor weather resistance and heat resistance, and the change of '0' is large. ,
Speaker is the main cause of sound quality change.
??????????? Because of its high hardness and hardness, the edge material was
fragile and could be a source of damage when the speaker was driven. SUMMARY OF THE
INVENTION The present invention solves such conventional problems, and has a heat resistance
and weather resistance, a good input resistance, and a speaker using a simultaneously formed,
simultaneously pasteable cloth edge. According to the invention, the edge can be attached to the
vibrating portion at the same time as the edge forming. In order to achieve this object, the
speaker of the present invention is coated with a resin layer of a copolymer of an acrylic resin
and a urethane resin as a filler on a base cloth at the peripheral portion of a frame bonded to the
field portion. A diaphragm is coupled to the thermally reactivatable polyurethane resin layer
through an edge, and a voice coil embedded in the magnetic gap of the field section is coupled to
the diaphragm. With this configuration, it is possible to obtain a highly reliable cloth edge that
can be rationalized, having 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. 6 shows the cross-sectional view of the essential part of the present
invention with the vibrating part of the present invention, wherein 16 is a polyurethane resin
layer, 16 is an acrylic-urethane copolymer resin layer mainly composed of acrylic, and 17 is
cotton. It is a base cloth. The base cloth 17 is impregnated with a phenol resin or a melamine
resin, and 18 is a vibrating portion. Next, a method of manufacturing the cloth edge sheet used in
the present invention will be described. Cotton cloth 17 (thread count # 30. An acrylic-urethane
copolymer 16 mainly composed of an acrylic resin having good weather resistance, heat
resistance and moisture resistance is coated on a number 90 О 88 of the number of impact. The
resin content is about 16 to 25% of the base cloth completion. An extender and a crosslinking
agent are added to this with 2 to 5% with respect to acrylics-urethane copolymer resin, and it
ages. Aging is performed until the acrylic-urethane copolymer is completely crosslinked (about 1
month at normal temperature). The heat resistance, the weather resistance and the moisture
resistance are good by aging and the physical properties do not change. Next, polyurethane resin
15 is laminated about 4 to 1 Q%. The polyurethane resin 15 is mainly used as an adhesive with
the vibrating portion 18 because it is reactivated by pressure and heat. The polyurethane resin
16 is excellent in weather resistance, moisture resistance and heat resistance, but lamination of
10% or more is not preferable. Finally, the sheet for an edge can be obtained by impregnating a
phenolic resin.
Pressurize the above-mentioned sheet, simultaneous molding by heat press. A cloth edge of
simultaneous pasting 9 can be obtained. Next, comparison of physical properties between the
product of the present invention and the conventional product is described. The base cloth is the
same. ?? Contents of the product of the present invention 20% (wt%) of acrylic-urethane
copolymer and 6% (wt%) of polyurethane laminated thereon as a filler (coating layer) Molding
process. 25 25% coated with mixed resin of S, BR, NBR as conventional item stopper, and molded
and processed. The phenolic impregnation of the invention and the prior art is 15% (wt%) relative
to the backing. (Margins below) ? Heat resistance comparison (100 'CX for 24 days)
Permeability of edge (cd / cd / sec) Fo change (vibration part uses painted aluminum foil) Fo
change is F of diaphragm. Use measuring equipment ? Moisture resistance Measurement after
500 Hr in a 55 ░ C О 95% RM atmosphere Change measurement ? Weather resistance UV
irradiation 15 o Hr No rainfall Sunshine weather meter (black panel temperature 63 ░ C) F after
introduction. Change measurement Speaker F at temperature change. Rate of change (16 ?
speaker) As described above, the speaker using the edge of the present invention is highly
reliable as described above after being released for 30 minutes into each atmosphere. Effects of
the Invention As described above, the speaker of the present invention is configured, so
simultaneous molding of the edges, simultaneous bonding of the edges and the vibrating part 9 is
possible. It is a thing.
Brief description of the drawings
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
fixed edge, and Fig. 4 is a free edge FIG. 6 is a cross-sectional view of an essential part of one
embodiment of the loudspeaker according to the present invention.
magnetic cap, 1 ░ ...... иииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии Vibration part Figure 1
Figure 2 Figure 1 Figure 1. ?
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