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JPS60185497

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DESCRIPTION JPS60185497
[0001]
The present invention relates to a speaker using a honeycomb diaphragm of a laminated
structure comprising a honeycomb core and a front skin layer and a back skin layer thinner than
the honeycomb cores respectively provided on the front and back thereof. First, FIGS. 1A and 2A
show a connection structure of voice coil bobbins in a conventional flat panel loudspeaker using
a honeycomb diaphragm. The honeycomb diaphragm 1 is formed by bonding a pair of skin
layers 3 and 4 on the front and back surfaces of the honeycomb core 2 by adhesive layers 5 and
6 and integrating them. In the example of FIG. 1A, the tip of the voice coil bobbin 7 is directly
bonded to the back skin layer 4 with the adhesive 8. In the example of FIG. 2A, the voice coil
bobbin 7 with the bobbin camp 9 attached to the tip is the back skin layer. 4 bonded with an
adhesive 8. In the figure, 10 is a voice coil. However, in such a conventional structure, when the
honeycomb diaphragm 1 is driven, the rear skin layer 4 is frequently torn in a circular shape as
shown in FIGS. 1B and 2B at the connection portion of the voice coil bobbin 7. The This is
because the driving force of the voice coil 10 is transmitted to the back skin layer 4 of the
diaphragm 1 through the voice coil bobbin 7, so that the back skin layer 4 is locally and
repeatedly bent, and adhesion is caused by its bending fatigue. It is because it peels from the
agent layer 6 and is torn off. In order to reduce the disturbance of the frequency characteristic in
the high region, the adhesive layer 5 ° 6 may be softened to increase the damping effect of the
diaphragm 1, but the adhesive layer 6 may be softened. The aforementioned accident is likely to
occur. In the flat-plate diaphragm, a laminated structure is adopted in order to increase its
rigidity. However, it is necessary to use a honeycomb core as a core because it is necessary to
reduce the overall mass, and a pair of skins bonded to both front and back thereof It is desirable
to make the layer as thin as possible. However, since the core has a large number of hollow
portions, the bonding strength of the skin layer to the honeycomb core is weak (and the skin
layer is easily peeled off from the honeycomb core). Therefore, when the honeycomb diaphragm
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1 is driven, the back skin layer 4 is easily peeled off from the honeycomb core 2 at the
connection point of the voice coil bobbin 7. The present invention has been invented in view of
the above-described circumstances, and effectively reinforces the back skin layer of the
honeycomb diaphragm to which the voice coil bobbin is connected, thereby connecting the
honeycomb diaphragm and the voice coil bobbin. It is an attempt to provide something that is
intended to be stabilized.
An embodiment of the present invention will be described below with reference to FIGS. 3 and 4.
The same reference numerals are given to the same structural parts as those of the conventional
example described above, and the description thereof is omitted. That is, in the speaker having a
structure in which the voice coil bobbin 7 is connected to the back skin layer 4 of the diaphragm
1 directly as shown in FIG. 3 or via the bobbin cap 9 as shown in FIG. The voice coil bobbin
connection point is configured to be reinforced by the reinforcing layer 12 from the outside of
the rear surface skin layer 4. That is, the reinforcing layer 12 having a disk shape or annular
shape (donut plate shape) larger than the diameter of the voice coil bobbin 7 is used, and this
reinforcing layer 12 is substantially coaxial with the end of the voice coil bobbin 7 in FIG. As
shown in FIG. 4, the adhesive 8 is adhered by means of the bobbin cap 9 as shown in FIG. The
reinforcing layer 12 is connected to the back skin layer 4 by adhesion with an adhesive 14 or
welding. The reinforcing layer 12 may be made of the same material as the skin layer 3.4 such as
a sheet material such as aluminum or carbon, but the material is not necessarily the same
material, and free materials such as metal, reinforced plastic, carbon fiber layer, etc. You may
choose In the present invention, it is also possible to make the reinforcing layer 12 a plurality of
layers. In the present invention, as described above, the back skin layer of the honeycomb
diaphragm to which the voice coil bobbin is connected is reinforced at the connection portion of
the voice coil bobbin by the reinforcing layer larger than the diameter of the voice coil bobbin.
Therefore, according to the present invention, the area to which the back skin layer receives the
force of the voice coil bobbin during driving or the transmission area of the force applied from
the voice coil bobbin to the back skin layer increases, and the force and stress are dispersed and
weakened. The back skin layer is locally and strongly bent repeatedly by the voice coil bobbin, so
that peeling off from the honeycomb core and tearing off can be prevented in advance. As a
result, the connection between the honeycomb diaphragm and the voice coil bobbin can be
stabilized and the reliability n can be remarkably improved. Moreover, since the reinforcing layer
is partially provided at the connection portion of the voice coil bobbin and is not provided on the
entire surface of the rear surface skin layer, the mass of the honeycomb diaphragm hardly
increases, and the driving force is It can be small.
[0002]
Brief description of the drawings
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[0003]
FIGS. 1A and 2A are cross-sectional views showing a conventional example, and FIGS. 1B and 2B
are cross-sectional views showing tearing of the skin layer in the above-mentioned conventional
example.
3 and 4 are cross-sectional views showing an embodiment of the present invention. In the
reference numerals used in the drawings, I----------------------------------------------honeycomb core 3--- -------- front skin layer 4 ------------- rear skin layer 7 ---------------- voice coil ho bottle 12 --- --- --- --- --Reinforcing layer 14 --- --- --- --- --- one-on-one adhesive. Agent 上 上 常-CO 11:--Fig. 1B
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