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JPS63279698

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DESCRIPTION JPS63279698
[0001]
0) Field of the Invention The present invention relates to an improvement of a method of bonding
to a resin diaphragm full voice coil bobbin. (B) Prior Art Conventionally, as a method for coupling
a speaker diaphragm to a voice coil bobbin, one shown in FIG. 4 is known. That is, after the
instant adhesive (4) is applied to the junction of the diaphragm (1) and the bobbin (2) in FIG. 4, a
thermosetting adhesive (for example, an epoxy resin adhesive) t-impregnation is applied. The
yarn (5) such as cotton yarn or wool yarn is wound along the junction of the bobbin (2) and the
diaphragm il + and heated to cure the adhesive attached to the yarn (5), and the bobbin (2) t -A
technique for fixing to the diaphragm + 13 is shown (Japanese Utility Model Publication No. 5821278, HO4R7 / 16) a However, the yarn (5) is wound around the junction of the diaphragm (1)
and the bobbin (2) In addition to the problem that the operation is difficult and the workability is
poor, the adhesion area is simply increased, so that the contact strength is not necessarily
sufficiently improved. Another conventional method is also known as shown in FIG. That is, in
FIG. 5, the diaphragm (1) is formed by molding an olefin resin (for example, polypropylene), and
after the primer (7a) e is applied to the bonding surface due to poor adhesion, an acrylic adhesive
By applying (4a), the diaphragm (1) and the bobbin (2) are completely coupled. なお、(3)は
ダンパーである。 However, in such prior art, although a primer capable of adhering to both an
olefin resin and an acrylic adhesive is required as a primer, there is no primer that can
sufficiently groove this condition, and there is variation in workability. There is a problem that it
is easy to occur. (-9 Problems to be Solved by the Invention The present invention has the abovementioned problems, that is, the workability is poor and the contact strength is not sufficiently
improved, and the condition as a primer is not sufficiently grooved, and the workability varies. I
will solve all points that are easy to occur. In the present invention, a plurality of through holes
are provided at intervals along the entire circumference of the joint portion between the resin
diaphragm and the voice coil bobbin, and the joint portion between the damper and the voice coil
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bobbin is After applying the adhesive of 1 and combining the two, the second adhesive identical
to the above adhesive is applied to the joint portion of the diaphragm and the voice coil bobbin to
couple the two, and It is solidified in the hole to connect the first and second adhesives.
(E) Since the first and second adhesives are connected in the plurality of through holes provided
along the entire periphery of the joint portion of the working diaphragm, the diaphragm is a
solidified adhesive in these through holes. The agent does not separate from the first adhesive
and the second adhesive, and the bonding between the diaphragm and the bobbin is
strengthened. The present invention will be described with reference to FIGS. 1 to 3. FIG. 1 is a
perspective view of an essential part of a speaker according to an embodiment of the present
invention, FIG. 2 is a top view of a diaphragm, and FIG. 3 is an enlarged sectional view of an
essential part. A feature of the present invention lies in a structure in which a plurality of through
holes ttU are provided at intervals along the entire circumference of the joint portion (1a) of the
diaphragm (1) made of an olefin resin (for example, polypropylene) . The coupling of the speaker
diaphragm of the present invention to the voice coil bobbin is performed as follows. First, the
damper (3) is completely inserted into the voice coil bobbin (2), and an acrylic adhesive (first
adhesive agent) (4a) is applied to the joint portion (3a), and the voice coil bobbin (2) Combine
Next, the diaphragm (1) is attached to the voice coil bobbin (2), and an acrylic adhesive (second
adhesive) (4b) of the same material as the first adhesive is applied to the bonding portion (1a).
Combine the voice coil bobbin (2) and the diaphragm ill. At this time, the second adhesive (4b)
flows in from the through hole (51) of the diaphragm (1) and contacts the unsolidified $ 1
adhesive (4a), and both are connected. When dried in this state, the first adhesive (4a), the
second! FF agent (4b) and connective g (4 °) ta in the through hole (5), solidify. Therefore, the
diaphragm 11+ is not only sandwiched between the first adhesive (4a) and the second adhesive
(4b), but also is a through hole provided along the entire periphery of the joint portion (1a) 5)
Since it is fixed to the voice coil bobbin (2) by the solidified connection part (4o) in the inside, the
bonding strength is remarkably improved. In addition, as an outer diameter of the through-hole
(5), the magnitude | size of to to -t5 (phi) was favorable as a result of experimenting with the
speaker of the aperture 16 (most). That is, if the outer diameter is less than 10ψ, there will be
one place where the adhesive does not flow into the through hole, and even if the connecting
part is formed, it will be too weak to break the speaker's vibration. Also, if the outer diameter is
15φ or more, the second adhesive will flow between the diaphragm and the damper due to its
own weight. Furthermore, if additional processing is carried out, the processing of this through
hole is carried out by processing drilling at the same time in the process of cutting the neck
portion of the diaphragm. There is nothing to do.
(G) As described in detail in the invention, according to the present invention, the bonding
strength of the resin diaphragm with insufficient strength to the voice coil bobbin with the
bobbin is greatly improved, and moreover, the workability is also good. is there.
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[0002]
Brief description of the drawings
[0003]
1 is a perspective view of an essential part of a speaker according to an embodiment of the
present invention, FIG. 2 is a top view of a diaphragm in the same manner, FIG. 3 is an enlarged
sectional view of an essential part in the same manner, and FIG. Fig. 5 is the same enlarged
sectional view of the main part of the conventional method.
Is a diaphragm, (1a) ... a joint, (2) ... a voice coil bobbin, (31 ... a damper +, (4a) ... a first adhesive,
(4b) · · · Second adhesive, (4C) · · · connecting part, (5) · · · hole.
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