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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view, FIG. 1 is a plan view, FIG. Figure 2
is the same. Fig. 3 is a diagram showing sound pressure frequency characteristics of the
embodiment of the present invention. FIG. 5 is a figure which shows the sound pressure
frequency characteristic of the conventional speaker. 1 ...... protrusion portions other than 2 ......
protrusions, 3 ...... sound pressure frequency characteristic, 4 ...... secondary distortion
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a diaphragm for a
speaker, and by increasing the rigidity of the diaphragm to increase the internal loss and
reducing its distortion, frequency characteristics 1-1-*, ai- It is an object of the present invention
to make --- one flat speaker diaphragm. Most conventional speaker diaphragms use cone paper
made from pulp, and it is effective to mix various organic and inorganic fibers in order to
improve rigidity and elasticity. And the flattening of the frequency characteristic has reached its
limit. In addition, as another means of increasing the rigidity of the diaphragm and flattening the
frequency characteristics, concentric or radial corrugations are provided. However, the provision
of corrugations results in an increase in distortion or another The present invention, which gives
rise to new problems such as the occurrence of distortion, is intended to improve the frequency
characteristics of these conventional diaphragms, and is a non-woven fabric composed of organic
synthetic fibers or organic synthetic fibers and natural fibers. It is characterized in that
projections are provided regularly or irregularly on one side or both sides of the constituted
diaphragm. Organic synthetic fibers used in the present invention are polyester, polyamide,
polyethylene, poly-2-poly-pylene, polyvinyl chloride etc., natural fibers are cotton, wool, silk, flax
etc. organic synthetic fibers Various resins such as acrylic resin, vinyl acetate, phenol, melamine
and the like are employed as a binder to be used in the case of mixing paper with natural fibers.
In the present invention, the projections provided to increase the rigidity of the diaphragm and
reduce the distortion are formed by thermocompression bonding. That is, a non-woven fabric is
formed by mixing synthetic fibers or synthetic fibers and natural fibers, and the non-woven fabric
is pressed by a heat roll having irregularities on the surface to form a protrusion. There are
various shapes such as a spherical shape, a cylindrical shape, and a prismatic shape as the shape
of the protruding portion, and an appropriate shape is adopted depending on the material and
the shape of the diaphragm. Although this protrusion may be provided only on one side of the
diaphragm or may be provided on both sides, it is generally advantageous to provide only on one
side in terms of rigidity. The most effective way of reducing both is adopted.
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