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JPS58195399

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DESCRIPTION JPS58195399
[0001]
The present invention relates to a bonding method of a diaphragm edge portion used for a
speaker. The conventional means for bonding a separate braking edge to the peripheral edge of
the diaphragm, for example, an edge made of a highly elastic material having a damping effect
such as foamed urethane rubber or foamed neoprene rubber, is an adhesive material, for
example, an acrylic thermoplastic resin. The adhesive solution prepared by diluting the solution
to a concentration that can be coated with a solvent is coated on the adhesive surface of the
diaphragm or on the adhesive surface of the braking edge, and the solvent impregnated on the
coated surface is volatilized. Bonding is achieved by heating and cooling while pressing with the
heat plate the bonding surface of the braking edge. In such a bonding means, when the
diaphragm is formed of fibers such as pulp fibers, a part of the resin to be involved in adhesion
together with the solvent penetrates into the space between the fiber layers by capillary action,
and the diaphragm There is a defect that causes deterioration in terms of vibrational physical
properties. In addition, since the solvent is used for bonding, the diaphragm and damping edge
materials must be excellent in solvent resistance, so it is necessary to limit the diaphragm
material and damping edge material, or the type of solvent. It was being done. It is an object of
the present invention to provide a method of bonding a diaphragm edge portion which eliminates
oblique defects. The bonding method of the diaphragm edge portion of the invention of the
following number will be described. A film of thermoplastic resin, for example, acrylic resin,
which is cut to have the same shape as a bonding surface for bonding the edge of the diaphragm
of this film and the braking edge is used as the bonding surface and the braking edge of the
diaphragm. When it is heated and cooled while being pressurized with a heat plate or the like,
the diaphragm and the braking edge can be bonded. Since this bonding method does not use a
solvent, it does not change the vibrating plate or the braking edge in the vibrational physical
property, and has a merit of widening the selection range of the vibrating plate and the braking
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edge material. Well, there is an advantage in that the amount of resin to be involved in adhesion
can be always kept constant and all the hairs that should be involved in adhesion participate in
adhesion, so there is also the advantage that stable adhesion can always be achieved. It is.
12-05-2019
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