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JPS5370425

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DESCRIPTION JPS5370425
Description 1, title of the invention
Method of manufacturing diaphragm
3. Detailed Description of the Invention The present invention relates to a method of
manufacturing a diaphragm having an etching coil. Recently, a diaphragm in which a drive part
and a vibration part are integrated has been developed. Such a diaphragm is attracting attention
as one that overcomes the drawbacks of the conventional cone-type loudspeakers because the
diaphragm and the coil are integrated. Conventionally, such a coiled diaphragm is manufactured
by bonding a metal foil of about 10 (μm) on a plastic film and etching the metal foil in a coil
shape. However, when the diaphragm is manufactured in this manner, the adhesive for bonding
the metal foil and the film remains at the portion where the metal foil is removed by etching. It
was very difficult to remove this residual adhesive without removing the adhesive that bonds the
coiled metal layer and the film after etching. For this reason, conventionally, since the next step is
carried out in the presence of the residual adhesive, if the pressure or heat processing is included
in the subsequent step, the residual adhesive has an adverse effect. For example, when the
diaphragm is subjected to a corrugation process, the diaphragm adheres to the press mold of the
heat press by the residual adhesive, the workability deteriorates, and the diaphragm itself may be
broken. Also, the mass of the residual adhesive was acoustically undesirable. EndPage: The
present invention was invented to overcome such conventional drawbacks. That is, it is an object
of the present invention to provide a method of manufacturing a diaphragm without any residual
adhesive. Hereinafter, the present invention will be described in detail with reference to the
drawings. As shown in FIG. 1, a metal foil (3) is adhered onto a release sheet (1) by an adhesive
(2), and the metal foil (3) " A micro coil of photoresist (4) is formed entirely by photo masking or
the like, or a micro coil of adhesive is formed by intaglio printing method, screen printing method
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or the like. As shown, a fine coil of photoresist or adhesive on metal foil (formed entirely of coiled
metal foil pattern (5) by Misaki etching etc, as shown in FIG. 6, metal foil pattern (5) "- The metal
foil pattern (5) is completely transferred onto the plastic film (6) using the pattern (4) to produce
a coiled diaphragm. The release sheet 1- (11 is preferably the same as the plastic film (6). This is
to avoid problems due to thermal contraction of the film due to heating during transfer. At this
time, the adhesive (2) should have a structure of two or more layers consisting of an adhesive (7)
strongly adhered to the release sheet (1) and an adhesive (8) not adhered to the plastic film (6).
preferable.
The adhesion strength between the micro coil pattern (4) of the photoresist or adhesive and the
metal foil (3) is the micro coil pattern (4) with the etching solution when etching the metal foil
(3). And metal i + 31 must be ji or less so as not to be attacked. The adhesive (8) and the metal
foil (3) must be adhered during etching, but must be easily removed when transferred to the
metal foil pattern (5) and the plastic film (6). As an example, the release sheet il + is a polyester
film, adhesive MJ (71 kanitrocellulose, a mixture of phthalic acid ester, polyester, urethane etc.,
adhesive (8) is a polyamide, a mixture of nitrocellulose, metal foil (3) Aluminum, photoresist or
adhesive (4) is rubber photosensitive 84BW or acrylic adhesive, polyester adhesive, plastic film
(5) is polyester film, etc .; 3) Since the present invention has the following constitution, the
diaphragm manufactured by the method of the present invention is pressured, since no excess
adhesive is left in the portion without the coiled pattern. The diaphragm can be easily processed
by heating and the like, and the mass of the diaphragm is reduced, so that the acoustic
characteristics are improved, and the present invention is an invention with extremely high utility
value.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 to FIG. 6 are explanatory views of the
manufacturing method of the present invention, and FIG. 4 is an explanatory view of one
embodiment of the present invention. +] 1 ... Release sheet (2) ... Adhesive (3) ... Elephant foil (4)
... Fine coiled pattern (5) ... Metal foil pattern (6) ... Plastic film patent applicant 4-EndPage: 2
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