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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a speaker diaphragm
according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view of a
vacuum suction bonding apparatus for manufacturing the speaker diaphragm of the present
invention. FIG. 3 is a cross-sectional view of another embodiment of the present invention, and
FIG. 4 is a frequency-causal characteristic diagram of a speaker using the speaker diaphragm of
the present invention. 1 ············································································································ Mesh metal, 10
········ Nylon film , 11 ... ... the end.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dome-shaped,
cone-shaped loudspeaker diaphragm. A feature of the present invention is that a thermoplastic '1
raw film is laminated on a cone or dome surface based on a woven fabric, non-woven fabric,
meshy gold leaf and the outer peripheral portion of this thermoplastic film is used as an edge. It
is in. As the error / material of the conventional O-speaker diaphragm, a cotton-based resin may
be impregnated with a comb-based resin, or a material using urethane foam "-1 1"; is it in
practical use or with an edge material? 9-12 does not exhibit sufficient characteristics. In
addition, in the case of a cone paper diaphragm using a single papermaking machine or a
conventional dome diaphragm, the cone surface material or the dome surface material and the
edge material are the same, and at the present, they do not give a favorable effect in terms of
acoustic characteristics. The cone or dome surface is very light and hard material (high elastic
modulus) is the acoustic property (this is preferable, but the edge material is light, internal loss
or large material is ideal to prevent the edge resonance region . However, in the present speaker
diaphragms, since the cone surface or dome surface and the edge are made of the same material,
an edge resonance occurs, which is not preferable in terms of acoustic characteristics, and a cone
surface or dome surface as an edge material. When different materials are used, a large loss is
usually caused in the material surface because the material in the central portion other than the
annular edge is not necessary. The present invention is intended to eliminate the above-
mentioned conventional drawbacks, and is a woven fabric composed of inorganic fibers, natural
fibers or their mixed fibers which contributes to weight reduction of the speaker diaphragm and
increase in internal loss elastic modulus. Or a) a thermoplastic film is laminated on a cone surface
or a dome surface based on a woven fabric, and an outer peripheral portion of the thermoplastic
film is used as an edge. The above-mentioned inorganic fiber refers to crow fiber, carphone fiber,
alumina fiber, holon fiber, zirconia fiber, gypsum fiber, etc., and synthetic fiber means polyester
fiber, nylon fiber, aromatic polyamide fiber, polypropylene fiber, vinyl chloride It says that it is
fiber. In addition, natural fibers (, F4, cotton, hemp, wool and so on. "Mez / yu-shaped gold pot"
refers to a mesh-like one consisting of iron and stainless steel. Further, the above-mentioned
thermoplastic film is polyethylene, polypropylene, nylon or polycarbonate. In addition to
polystyrene, polyvinyl fluoride, polyvinyl fluoride, polyvinylidene chloride, polyfluorinated
vinylitene, polyester, polyacrylate and the like films, thermoplastic elastomers such as
polyurethane elastomers and polyester elastomers are also included.
Hereinafter, embodiments of the present invention will be described with reference to the
drawings. 1 [Example 1] 2 · j 4-1-1 As shown in Fig. 1, a polyester non-woven fabric with surface
density If 60,% / m is impregnated with an acrylic curable binder to a surface density of 80 n / l
and a cone of 10 m in diameter Form face 1 with a heat-brace. A 50 μ polyurethane elastomer
film 2 is laminated to the non-woven cone surface 1 by vacuum suction bonding, and at the same
time the edge 3 is simultaneously formed. When using a polyurethane elastomer film with a
comb-like elongation as in this example, it is more effective to reduce the edge width. FIG. 2
shows a cross section of an apparatus for carrying out the vacuum suction bonding method, and
a mold 6 in which a cone-shaped recess 4 and a suction hole 5 are formed! A cone surface 1
made of this polyester non-woven fabric is placed, a polyurethane elastomer film 2 is disposed on
the upper part of the mold 6, and the polyurethane elastomer film 2 is heated by a heater 7 since
exhausting from the suction holes 5. It laminates on the cone side 1. In FIG. 2, (8) is a mold 6'7) [!
It is a ring-shaped uneven portion formed on the outer peripheral portion of the J portion 4, and
a portion corresponding to the above-mentioned uneven portion 8 of the film 5 made of
polyurethane elastomer is an edge 3. [Example 2] As shown in FIG. 3, a stainless steel mesh metal
of surface density # 70 G '/ ctN is pressed to a diameter of 35 mm. A dome surface 9 having a
dome depth of B mm is formed, and a nylon film 10 having a thickness of 50 μm is laminated on
the dome surface 9 as in the first embodiment, and the outer peripheral portion of the nylon film
1 o is an edge 11. . The speaker diaphragm according to the present invention has the abovedescribed configuration, and a plastic film is laminated on the cone surface or the dome surface,
so the internal loss of the speaker water moving plate becomes large, and error / resonance is
prevented. As shown in FIG. 4; this flat frequency characteristic can be obtained, as well as
having a merit that the loss of material is reduced as compared with the one using the cyclic
enone material as in the prior art.