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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing a skin layer of a
conventional diaphragm, FIG. 2 is a cross-sectional view showing a skin layer of one embodiment
of the present invention, and FIG. FIG. 4 is a cross-sectional view showing a skin layer of one
embodiment, FIG. 4 is a view of a diaphragm seen from the skin layer surface of the present
invention, and FIG. 5 is an enlarged view of a cross section of FIG. 1 is a foamed synthetic resin, 2
is an adhesive layer, 3 is a skin layer, 14 is a non-woven fabric, and 5 is a slit.
DETAILED DESCRIPTION OF THE INVENTION The X device relates to a tie plate in a flat
loudspeaker. Conventionally, as shown in FIG. 1, an adhesive is applied to the surface on which
the squeeze layer of the disc or conical foam synthetic resin 1 is to be provided, and the film-like
material to be the skin layer is adhered to form the skin layer 3 In the dark with foam synthetic
resin shake 1 day and 7 layers 3! # The agent layer 2 is formed. As the skin layer material, a
metal foil, a synthetic resin film, or a film-like material obtained by heat-compressing a foam
synthetic resin sheet such as urethane foam to stop air permeability is used. The purpose of this
saving '4 is to reduce the number of processing steps and to improve the high frequency
characteristics by reducing the amount of electric power. Conventionally, two steps are required:
a first step of applying an adhesive to the surface on which the squeeze 7 layer is to be provided
and a second step of bonding a synthetic resin film or a gold edge foil to be a skin layer. By using
the heat-adhesive visco-elastic resin film, the first step becomes unnecessary, and the squeeze 7
layer is formed only in the second step. Since no adhesive is used, the weight of the adhesive can
reduce the weight of the adhesive IIII, thereby improving the area characteristics. A viscoelastic
synthetic resin film having heat adhesion is used as a skin layer, and the skin layer is formed on
the surface of the foamed synthetic resin by heat pressing without applying an adhesive.
Examples of skin l-film materials include butadiene rubber, chlorobreno rubber, uremen rubber,
styrene / butadieno Jul [compound, isophthyreno / isobreno co-weight, y-n-nitrile-butadiene co
(2) polymer, acrylic ester co-electric compound Or a visco-elastic synthetic resin having thermal
adhesiveness such as ethylene vinyl acetate copolymer is used as a film-like sheet impregnated
with a film of thickness L 1 to a 5 mm or non-woven fabric such as rayon fiber, or is
commercially available Heat adhesive film etc. dance by use. An embodiment of the present
invention will be described below with reference to the drawings. FIG. 2 is a cross-sectional view
showing a skin layer of a diaphragm according to the present invention; a foamed synthetic resin
diaphragm 1; for example, a thermally adhesive ethylene vinyl acetate copolymer film which
forms a skin layer 3 on the surface of a foamed polystyrene resin diaphragm. (Thickness α2Ns),
put a release paper such as fluorocarbon resin coated on top and heat and press at a temperature
of 90 ° C and a breath pressure of 200t / cj for 30 seconds. The skin layer 3 is formed on the
surface of the vibration plate except for the above. FIG. 3 is a cross-sectional view of an
embodiment of the present invention; FIG. What is contained in a non-woven fabric using rayon
fibers of-and is in the form of a sheet having a thickness of-is used as the skin / material (3).
In the same manner as described above, the sheet-like material is formed on the surface of the
foamed synthetic resin diaphragm 10 with the skin layer 3 by heating and pressure pressing. FIG.
4 is a view of the diaphragm seen from the surface of the skin layer. The ABftlla view is shown. In
the cut-out autopsy of the foamed synthetic resin diaphragm, the connection is made only with
the skin layer 3, and the performance is stabilized since there is no unstable element which
causes the adhesive to leak and adhere and causes fluctuation in vibration characteristics. It is
possible to improve the acoustic characteristics by excessively selecting the physical properties
of the visco-elastic substance on the surface of the skin layer. As described above, according to
the X device, the adhesive application process is eliminated, the weight of the adhesive is
reduced, and the improvement effect of the high frequency characteristic is large.
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