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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a top view of a core of a diaphragm of a
speaker according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of
FIG. 1 aa ', and FIG. Sound pressure frequency characteristics of a speaker using a diaphragm and
a conventional speaker, FIG. 4 is a top view of another embodiment of the present invention, and
FIG. 6 is a sound pressure frequency characteristic of a speaker using the same diaphragm. FIG.
1.2 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · ... FIG.
■]■−−7;2050100−200j 0010002000500010000−200
DETAILED DESCRIPTION OF THE INVENTION The present invention is a speaker diaphragm. It is
an object of the present invention to provide a speaker diaphragm which can be easily fabricated
and has high rigidity. Most of the conventional speaker diaphragms 1 are formed by paper
molding of a paper valve, and the diaphragms generally have a cone shape. Therefore, the
position of the sound source is shifted between the inner and outer circumferences of the largeaperture speaker diaphragm, causing a phase difference, and a speaker with a flat f characteristic
has a drawback that it can be obtained. -On the other hand, a flat plate speaker in which the
diaphragm is flat and the positions of the sound sources are aligned is 2-advantage in realizing
the f characteristic flat. However, in the case of a flat plate, when a conventional paper is used as
a diaphragm, the stiffness against bending is small, division vibration is likely to occur, and a flat
custom over a wide band can not be obtained. On the other hand, there is also an example in
which plastic foam such as expanded polystyrene is used as a flat diaphragm, but this is also not
suitable as a diaphragm because it has low rigidity. 0 What can be considered there is a flat
diaphragm having a sandwich structure capable of obtaining high bending rigidity However,
when a structural material such as a conventional aluminum honeycomb is used as a core
material of the diaphragm, its manufacturing process is extremely complicated compared to the
conventional diaphragm using paper, because its processing steps are very complicated. The
present invention eliminates the drawbacks of the above-described conventional diaphragm, and
can be easily manufactured, and further, it is possible to realize f custom-made flat speaker
characteristics. The present invention will be described in more detail by way of the following
examples. <Example 1> Polystyrene film resin film having a thickness of 7 oμm (U polymer, Uwax table 1. Unitika) 2) The core material 1 with a thickness of 2 m1ll and a diameter of 281 m
is formed by vacuum molding using a mold having irregularities on the surface 2), and aluminum
foil 20 μm as a facing material on both sides of this core 10 Was made into a diaphragm. Figure
1 shows Alri recess and Bd protrusion, and Figure 2 shows aa 'cross section. Figure 1 shows the
speaker's f characteristics using the diaphragm shown in Figure 2 and Figure 2 shows the f
characteristic of the speaker. Also the same diameter. 0 <Example 2> showing the f'm property of
a speaker using a diaphragm having a core of expanded polystyrene foam as an example
according to FIG. 3 <Example 2> Using a mold having a concavo-convex polyarylate resin film
(thickness 7 oμm) The core material 2 shown in FIG. 4 is formed by vacuum forming, and an
aluminum foil having a thickness of 2oom is attached to both surfaces of the core material 20 to
form a diaphragm. As can be seen from the mouth of FIG. 6 showing the f characteristic of the
speaker using the diaphragm shown in FIG. 4, the diaphragm in Example 1 is higher than the
diaphragm in which the foam polystyrene is used as the core material. The area regeneration
limit is high, and the f characteristic is flat and 2 yen.
The same characteristics were obtained also in the case of Example 1 Vc in which the pattern of
the unevenness of the core material was changed. As a concavo-convex pattern of core material,
it is triangle other than the example. Rhombuses, cruciforms, etc. are considered, and the
arrangement method thereof may be variously considered, such as concentric circles,
protuberances, etc., but these are the ones from which the same effects and custom orders as in
the above-mentioned embodiment can be obtained. Further, by cutting off the bottom portion
(the bonding portion with the surface material) of the convex and concave portions, the weight of
the C diaphragm can be reduced to improve the efficiency. The thickness of the core material
may be changed in accordance with the required acoustic characteristics, or another
thermoplastic resin may be used. In addition, if a metal foil such as aluminum foil is used, the
rigidity is further enhanced, and the high sound reproduction area can be expanded. As described
above, unlike the conventional honeycomb structure, the speaker diaphragm of the present
invention can form the core material by vacuum, compressed air, press molding, etc., and
therefore, is advantageous in that the speaker diaphragm can be realized at low cost and
excellent in acoustic characteristics. The