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Description 1, title of the invention
Speaker diaphragm and method of manufacturing the same
3. Detailed Description of the Invention The present invention relates to a diaphragm edge for a
speaker and a method of manufacturing the same, and in particular, a woven fabric or a
nonwoven fabric is specially processed and used as an edge material of a speaker diaphragm.
Both are inherently breathable so they can not be used as edges unless they are vented. In
general, aeration prevention is performed by coating rubber latex or synthetic resin on a fabric,
but rubber latex or synthetic resin has a larger mass than the fabric, and thus has a problem of
increasing the vibration mass and lowering the output sound pressure. Have For example, it
becomes a curve shown by a dotted line in FIG. The present invention obviates the disadvantages
of the prior art and relates to an edge which does not require any venting treatment and its
method of manufacture. The drawing shows an edge according to the present invention, and a
woven or non-woven fabric 1 obtained by a conventionally known method is pressurecompressed with a high pressure roller such as a calender roll to squeeze the monofilament 2 of
the fabric 1 to form an edge. Obtain material 3. As shown in FIG. 1, the single fibers 2 are circular
in cross section and separated from each other by a predetermined distance, and the
predetermined distance is considerably large. It is necessary to apply a synthetic resin in an
amount corresponding to −, and the thickness of the fabric is also considerably thick ((less is the
cross-sectional radius of a single fiber, and furthermore Be required). The amount of synthetic
resin also increases, which of course results in lower sound pressure. In addition, although many
kinds of fibers are developed and used, all of these fibers can be crushed by a pressure roller, so
in the present invention, in a single fiber that can be crushed by a pressure roller Is valid for That
is, as described with reference to FIG. 2, when the single fiber 2 is crushed by the pressure roller,
the circular cross section (FIG. 1) becomes a single fiber having a rectangular cross section (FIG.
2). The distance between the two is extremely narrow, and the required amount of synthetic resin
for anti-venting treatment is greatly reduced. The single fiber usually has a circular cross-section,
and is woven into a fabric, and there are few rectangular cross-sections from the beginning, and
the cross-section of the single fiber from the beginning is deformed as it is applied to the
pressure roller. Is smaller, and the predetermined interval is not so narrow, and the one having
the pressure roller circular on the cross section is narrower than the predetermined interval.
Therefore, it is better to construct the edge using a single fiber having a circular cross-section
and made into a single fiber having a rectangular cross-section.
The edge base material 3 is heat-formed (not shown) into a required shape with corrugation by a
molding die to obtain a speaker diaphragm edge. Thus, the present invention press-compacts the
fabric into an edge substrate so that the substrate according to the present invention has a much
smaller spacing between monofilaments than conventional non-press-compressed woven fabrics,
Breathability is extremely low. For this reason, it is not necessary to coat the edge substrate with
rubber latex to prevent air flow, so the vibration mass can be reduced, and the output sound
pressure in the low and mid range can be increased as shown in FIG. Can. In FIG. 3, the horizontal
axis represents frequency, the vertical axis represents output sound pressure, the solid curve
represents the characteristics of the speaker using the edge substrate according to the present
invention, and the dotted curve represents the characteristics of the conventional speaker.
Further, the process of manufacturing the speaker can be reduced by eliminating the need for the
ventilation prevention process.
4. Brief description of the drawings FIG. 1 is a cross-sectional view of a woven fabric, FIG. 2 is a
cross-sectional view of an edge substrate according to the present invention, and FIG. 3 is a
characteristic of a speaker using the conventional one and the present invention. It is a
characteristic curve figure to show. In the figure, 1 is a fabric, 2 is a single fiber, and 3 is a
substrate. Agent Attorney Attorney Fukushi (LEndPage: 2 Procedure Amendment (λ Be) 1.
Display of the incident 2, Invention title 2, Invention title 3, Relationship patent applicant 4 with
the case, Agent address 8545 Naganocho, Abeno-ku, Osaka City Date of correction instruction
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