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BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1A and 1B are sectional views of a dome-shaped
diaphragm of the present invention, respectively. 1c is a micropore, 1a is a polypropylene film,
1b is a loss material.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the improvement
of the diaphragm of a so-called knot dome type speaker using a soft diaphragm. This type of
diaphragm has the following configuration. (1) A diaphragm made of a woven or knitted fabric of
a natural fiber such as cotton or silk, impregnated with a thermosetting resin and press-formed
thereon, and coated with a loss material. (2) A diaphragm formed by impregnating a woven or
knitted fabric of synthetic fibers such as nylon and polyester with a loss material and heatforming the same. Vibrator plate formed by molding synthetic resin film such as polyester resin,
polypropyref, etc. (4) A diaphragm made of the above synthetic resin film as a substrate and
coated with a loss material. The following disadvantages have been clarified in the diaphragm of
the conventional example. That is, since the hygroscopicity of natural fibers increases in the
diaphragm of (1), deterioration due to humidity occurs, and when the impregnation amount of
the thermosetting resin is increased to suppress this, the cloth substrate becomes hard and steep
The frequency characteristic is disturbed due to resonance or the like. The diaphragm of (2) is
filled with a loss material with a large amount of dark in the cloth, so that the weight of the
diaphragm is increased, and the acoustic shaft sealing efficiency is deteriorated. Furthermore,
since the above-mentioned (1) and (2) using the so-called woven woven fabric as a base is
composed of warp and weft which are respectively orthogonal to each other, the rigidity changes
depending on the h direction of the stitches. There is a limit, and the shape changes with time
due to the residual stress after molding. Because the internal loss of the material itself is small in
the diaphragm of (3), the frequency characteristic is degraded by the three steep resonances. The
diaphragm of (4) is coated with a loss material to solve the above-mentioned drawback (3), but
since the surface of the film is hydrophobic, a stone type must be used as the loss material .
However, due to the above-mentioned solvent, there is a risk that the film may be melted, and the
loss material which can be used is limited. Also, it has been attempted to use an emulsion type
loss material by subjecting the film to an activation treatment, but even with this, it is difficult to
coat a uniform thickness on the film surface. Furthermore, the diaphragm coated only on the
surface has less vibration absorbing property as compared with the diaphragm in which the loss
material is filled up to the inside of the base as in (1) and (2). This invention is a diaphragm
formed by impregnating a microporous polypropylene film subjected to an activation treatment
with an emulsion-type loss material and then heat-molding the diaphragm. The embodiment
shown in the drawings will be described in more detail. The micro-porous polypropylene film is a
20 μ to 80 μ thick film in which fine pores IC having a diameter of 100 to 1000 λ are formed
in the range of a porosity of 35 to 50%, using a polypropylene, as a substrate 1a. A polyflopyrene
film impregnated with an emulsion / loss of loss material 1b is laminated by press molding with a
mold 1: 1: (0'-140 ° C.) get l.
As shown in FIG. 1 (5), the diaphragm l has a structure in which the loss material 1b is laminated
on the surface of the diaphragm and the loss 拐 is filled in the fine holes IC. The degree of filling
can be changed by selecting the concentration or the like according to the properties required of
the diaphragm. The diaphragm of such a structure has various advantages, which have been
obtained in the prior art: f'I. (1) By activating polyflopyrene, it becomes hydrophilic V1 and the
presence of a large number of micropores results in the uniform coating of the Emarnoyo / Tiff
loss material. (2) Since the loss material intervenes inside the diaphragm by filling the loss
material into the fine holes, the vibration energy absorbing effect is extremely thick. (3) There is
no directivity as in the case of a diaphragm based on a woven or knitted fabric. (4) Since the
density of microboric polypropylene is extremely small (p = 0.49 to 056) and the elbow of the
loss material may be smaller than that of the conventional loss material coated structure, the
vibration is vibration. The weight of the board can be reduced. It is possible to dramatically
improve the characteristics required as an equal vibration plate.
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