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Loudspeaker of the Invention Loudspeaker A collection of fine synthetic fibers and bundled
together with a binder to form an artificial leather having a single-layer structure as a whole.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speaker. The
speaker 1, for example, a dynamics beaker, as shown in FIG. 1, has a vibration system in which a
bobbin / (3) having a voice coil (2) is attached to a central portion of an imaging plate (1). This
vibration system is supported by the frame (4) at its base portion III via the damper (5), and is
supported and supported via the edge (6) on the open end side. (The force is 18 at the center
pole) Fi Mcnet. In such a speaker, piston movement is performed from the low range to the mid
range including its edge (6), that is, the support of the vibration system. However, at the
frequency of the mid range, the valley of the mid range due to the anticognition of the edge. In
general, distortion becomes large near this frequency. And-The valley of the medium sound
greatly affects the sound quality, and the valley needs to be as small as possible. On the other
hand, this valley is a book whose depth 1 frequency is changed by the equivalent quality flVc of
the edge (6), and therefore the valley of the above-mentioned frequency characteristic is reduced
by reducing the area of the edge (6). However, on the other hand, the linearity at the place where
the amplitude of the low range is large becomes worse, and the low resonance frequency f. Make
it higher. On the other hand, it is known that the depth 1 frequency of the valley of the medium
sound changes depending on the resonance sharpness Q and the Young's modulus E of this edge
material. That is, the depth of the valley can be reduced by decreasing the Q of the edge material,
and the height can be moved by increasing the Young's modulus E. Conventionally, this
resonance sharpness Q is to be reduced. A method was used, such as coating a screw colloid or
rubber-based damping material on the edge part, EndPage: 1 and so on. However, when the
damping material is applied to the edge in this way, the mass increases. Changes due to
temperature, temporal changes, etc. become intermittent. The present invention seeks to provide
a loudspeaker without such drawbacks. That is, in the present invention, for example, in the
speaker as shown in FIG. 1, a support such as an edge (6) or a damper 15 for supporting the
vibration system is constituted by a press-molded body of artificial leather swede. . Conventional
artificial leather is cloth and urethane foam. Although mainly based on a non-woven fabric and
those having a skin layer such as urethane or raised on one surface, the vibration-based support
used in the speaker according to the present invention is not particularly limited to such ones.
Constructed by artificial leather swede with natural swede and similar structure.
That is, as shown in FIG. 2, artificial leather suede is composed of natural suede, which is a
bundle of collagen fiber bundles. Fine synthetic fibers are gathered in the same @ VC bundle
form, and these bundles form an entangled structure as a whole, and using a single-layered book,
this is heat-pressed and molded. The edge (6) or damper 15 of the desired shape is constructed.
As such artificial leather suede, for example, one having a composition of 70% of polyester and
30% of urethane can be used to use Exeine (trade name, manufactured by Toshisha Co., Ltd.) of 1
fll. In this case, the forming of the edge (6) or the damper (5) is performed by hot press forming
at '150C to 210C, Example 1. (The heat press group fi [1 kg / ll 12.15 seconds at 170 170C.
Here's why the heating is done at 150C-210C. If it is less than 150C, molding becomes difficult,
and if it exceeds 210C, there is a possibility that the fiber itself may be broken. Next, in the
following table, physical constants of the above-mentioned and artificial leather swede and EVA
(polyethylene + vinyl acetate) as another material, urethane, and cloth are shown in comparison.
Table 1. Heat-pressing artificial leather swede as evident from this table, compared to other
materials. The Young's modulus E is two orders of magnitude larger, and. E / E is also one digit
larger. Moreover, since the polyester described above is used as a synthetic fiber and urethane is
used as a binder, the above-mentioned exesen is excellent in thermoforming property and
weather resistance, and is used as a vibration system support of a speaker over a long period of
time Exhibit stable characteristics. In addition, Fig. 3 shows the frequency characteristics
(frequency) of the loudspeaker according to the present invention, in which the edge (6) is
constituted by using the exesane as artificial leather suede, and the loudspeaker in which the
edge (6) is constituted by the conventional cloth -8 PL (8 Round Pressure Level)) is shown by
comparison. The broken curve and the solid curve in the same figure respectively indicate the
characteristic curves of the speaker according to the present invention and the conventional
speaker. As apparent from this, the loudspeaker according to the present invention has flat
characteristics in the operating frequency range of 5 kHz or less. As described above, according
to the present invention, it is a book that can obtain a speaker with excellent characteristics by
using the artificial leather suede, and its advantage is great for practical use.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of an example of a
speaker to which the present invention can be applied, FIG. 2 is an enlarged structural view of an
artificial leather swede used for the speaker of the present invention, and FIG. It is a frequency
characteristic curve figure EndPage: 2. (1) is an imaging plate, (2) is a voice coil, (3) is its bobbin,
(4) is a frame, (5) is a damper, (6) is an edge, (7) is a center ball, (8) ) Is a magnet. Patent
Applicant Sony Corporation Atsushi Ito Fig. 1 Fig. 2 End Page: 3