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JPH01225299

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DESCRIPTION JPH01225299
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
apparatus for coupling a diaphragm of a cone speaker to a voice coil bobbin. [Prior Art] FIG. 5
and FIG. 6 are diagrams showing a conventional diaphragm connecting apparatus of a cone
speaker, FIG. 5 is a plan view, and FIG. 6 is a sectional view taken along line Vl-Vl of FIG. . In the
figure, (1) is a trumpet-shaped diaphragm which is formed by bonding a sandwich on both sides
with a skin core material (3) and a back skin material (4). . (5) is a cylindrical coil bobbin around
which a voice coil (6) is wound, and the central part of the diaphragm (1) is inserted into the
outer peripheral surface of the coil bobbin (5) and bonded with an adhesive (7) . The diaphragm
coupling device of the conventional cone speaker is configured as described above, and a driving
force is generated by supplying a current 'to the voice coil (6) placed in the magnetic gap, and
this generates the driving force through the coil bobbin (5). Moving plate (transmitted to 11) As a
result, the diaphragm (11 vibrates and a sound is emitted. The moving plate (11 is required to be
excellent in rigidity and light in weight, but the diaphragm formed by the honeycomb core (2) is
widely used as a material sufficiently satisfying the above-mentioned requirements) ing.
[Problems to be Solved by the Invention] In the conventional diaphragm connecting apparatus
for a cone speaker as described above, the center portion of the used diaphragm (1) is inserted
into the coil bobbin (5) and bonded to the honeycomb core (2). Because the honeycomb (11) has
a honeycomb-like core material exposed, it is in line contact with the coil bobbin (5) and is
bonded using an adhesive (7). However, it is difficult to obtain a large bonding strength. At the
time of large input, there is a problem that the input resistance is low, such as being broken at
this part. The invention of C is devised to solve the above-mentioned problems, and it is possible
to increase the bonding strength between the diaphragm and the coil bobbin, and to realize the
high input resistance and the diaphragm coupling & of the cone speaker. Intended to be
provided. Another object of the present invention is to provide a diaphragm coupling device for a
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cone speaker capable of further strengthening the bonding strength between the diaphragm and
the coil bobbin. [Means for Solving the Problems] In the diaphragm coupling device for a cone
speaker according to the present invention, a bonded body having a volume density larger than
that of the honeycomb core is embedded in the center of the honeycomb core sandwich
diaphragm fitted into the coil bobbin. The bonding body is fixed to a coil bobbin with an
adhesive.
Further, in the diaphragm coupling device for a cone speaker according to another invention of
the present invention, in the above-described one, the coupling body is coupled to the coil bobbin
by the fastening member, and the adhesive is filled between the coil bobbin and the coupling
body. [Operation] In the present invention, since the central portion of the diaphragm and the
voice coil are identified through bonding on the entire circumference of the bonding body, the
bonding surface of these bonding surfaces is large, and the bonding area is large. Further, in
another invention of the present invention, the combined body is further coupled to the coil
bobbin by a fastening member. The bonding strength between the two increases. 1 and 2 show
an embodiment of the present invention, FIG. 1 is a cross-sectional view taken along line 1-1 of
FIG. 2, and FIG. 2 is a plan view. Similar parts are indicated by the same reference numerals. In
the figure, αυ is a combination of a material 1 having a larger volume density than the
honeycomb core (2), for example, a reinforced plastic material, and a diaphragm embedded in the
center of the central portion 11; And is inserted into the coil bobbin (5) and bonded with an
adhesive (7). The operation of the diaphragm coupling device for a cone speaker configured as
described above is similar to that of the conventional device. Then, at the time of large input, a
large driving force acts on the vibration system, and a large force is applied to the junction of the
coil bobbin (5) and the vibration & (1) to%. However, since the inner peripheral edge portion
(11a) of the combined body +111 is formed in a cylindrical shape and joined with the coil bobbin
(5) with a large bonding area, the bonding strength is large and sufficiently withstands the acting
force at the large input It is possible. FIGS. 3 and 4 show another embodiment of the present
invention, and FIG. 3 is a plane (9), and FIG. 4 is a cross-sectional view taken along the line of FIG.
The inner peripheral edge (41a) and the coil bobbin (5) are coupled by a fastening member Ql
such as a screw or a nut, and an adhesive (7) is formed between the coil bobbin (5) and the inner
peripheral edge (11a) of the combined body αD. ) Is filled. As described above, since the bonded
body a and the coil bobbin (5) are bonded by the fastening member a3 and then filled with the
adhesive (7), their bonding strength becomes extremely large. In each of the above-described
embodiments, the bonded body a is formed of a reinforced plastic material, but any material
having a larger volume density than the honeycomb core (2), such as metal or wood 2 paper,
may be used. It is possible to get the function. [Effects of the Invention] As described above, in
the present invention, in the central portion of the honeycomb core sandwich diaphragm fitted
into the coil bobbin, a bonded body having a large volume density is embedded in the
honeycomb core and the bonded body is bonded to all coil bobbins. Since it is fixed by the agent,
the adhesive strength between the diaphragm and the coil bobbin can be large, and a cone
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speaker with high input resistance can be realized.
Further, in another invention of the present invention, the combined body is connected to the coil
bobbin by the fastening member and the adhesive is filled between the coiled bobbin joint, so
that the bonding strength of the diaphragm and the coil bobbin can be further enhanced. There
is.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a view showing an embodiment of a diaphragm coupling device for a cone speaker
according to the present invention, which is a sectional view taken along line I-1 of FIG. 2, FIG. 2
is a plan view of FIG. FIG. 4 is a cross-sectional view taken along the line IV-IV of FIG. 3, FIG. 5 is
a plan view showing the diaphragm coupling device of the conventional cone speaker, and FIG.
FIG. 2 is a cross-sectional view taken along the line of FIG.
In the figure, (1) is a diaphragm, (21 is a honeycomb core, (3) is a front skin material, (4) is a
back skin material, and (51 is a coil bobbin). (6) is a voice coil, (7) is an adhesive, a1 + is a
combined body, and (13 is a fastening member. In the two figures, the same reference numerals
denote the same or half-phase portions.
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