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JPS63254896

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DESCRIPTION JPS63254896
[0001]
TECHNICAL FIELD The present invention relates to a flat loudspeaker having a flat diaphragm. 2.
Related Art Conventionally, in a flat plate speaker using a flat plate moving plate, in order to
maintain the strength between the voice coil and the diaphragm, the voice coil cap can be fully
used between the voice coil and the diaphragm so You get a large enough strong 1fk.
Hereinafter, the conventional speaker as described above will be described with reference to the
entire drawings. FIG. 3 shows the cross section of the main part of a conventional flat panel
loudspeaker. In FIG. 3, 1 is a flat diaphragm, 2 is a voice coil cap whose upper horizontal flat
portion is fixed to the lower end surface of the flat diaphragm 1 and whose lower cylindrical
outer peripheral surface is fixed to the inner peripheral surface of the voice coil bobbin 3 is 4 It
is a voice coil inserted in the magnetic gap (not shown) of the magnetic circuit. The operation of
the flat loudspeaker configured as described above will be described below. First, when a voice
current flows through the voice coil 4 present in the magnetic gap, a force is generated according
to Fleming's left-hand rule and becomes a driving force. This drive canopy coil bobbin 3. The
entire voice coil cap 2 is transmitted to the flat diaphragm 1, and a sound is generated from the
diaphragm. However, in the above configuration, the outer diameter of the cylindrical portion of
the voice coil cap needs to be smaller than the inner diameter of the voice coil bobbin, so after
bonding the voice coil cap to the voice coil bobbin However, when the adhesion between the
voice coil cap and the voice coil bobbin is not complete, there is a problem that a gap is
generated between them and an abnormal sound is generated. SUMMARY OF THE INVENTION In
view of the above problems, the present invention can provide the entire flat plate speaker
without generation of abnormal sound even when the connection between the voice coil cap and
the voice coil bobbin is incomplete. Means for Solving the Problems In order to achieve this
object, the flat panel speaker of the present invention has a horizontal flat portion at the upper
end and a slit in the longitudinal direction, and a cylindrical ring having a flexibility and a lower
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cylindrical portion A voice coil cap is inserted into the inner surface of the voice coil bobbin
without gaps and has the upper end horizontal flat portion fixed to the lower end surface of the
flat plate diaphragm. By this operation, the voice coil camp can not always generate a gap
between the voice coil and the bobbin. <A defect such as an abnormal sound caused by the gap
between the voice coil cap and the voice coil bobbin as in the conventional flat plate speaker In
addition, the productivity of the speaker is improved and the reliability of the speaker is also
improved.
Embodiment An embodiment of the present invention will be described with reference to the
drawings. FIG. 1 is a cross-sectional view of an essential part of a flat loudspeaker according to
an embodiment of the present invention, and FIG. 2 is a perspective view of a part of a voice coil
cap. In FIG. 1, 5 is a flat diaphragm, 6 is fixed to the lower end portion of the flat diaphragm 5 at
the upper end horizontal flat portion, and is fixed to the inner surface of the voice coil bobbin 7
on the outer peripheral surface of the cylindrical portion. The voice coil cap provided is a voice
coil 8 inserted into a magnetic gap (not shown). In FIG. 2, 6 is a voice coil cap, 9 is a slit provided
in the longitudinal direction of the voice coil cap 6. The operation of the flat plate speaker
configured as described above will be described below. First, when a voice current flows through
the voice coil 8, one driving force is generated, and the voice coil bobbin 7 and the voice coil
camp 6 are all driven through the flat plate Force is transmitted and vibrates to generate sound.
As described above, according to the present embodiment, the same cylindrical ring provided
with springiness in the circumferential direction by providing the horizontal flat portion at the
upper end and providing the slit 9 in the longitudinal direction, the outer diameter of which is
the voice coil bobbin Voice coil cap 6 which is slightly larger than the inner diameter of 7? 1-By
inserting and fixing in the voice coil bobbin 7 while keeping the ring diameter small, it is possible
to eliminate the gap between the voice coil bobbin 7 and the voice coil cap 60, thereby
generating an abnormal sound Can be prevented. In the prior art, the outer diameter of the voice
coil cap 6 is conventionally made smaller than the inner diameter of the voice coil bobbin 7 in
order to emphasize mass productivity, so that abnormal noise is generated when the adhesion
between these is incomplete. In the present embodiment, the slits 9 of the voice coil cap 6 are
provided straight in the longitudinal direction, but the same effect can be obtained with any
shape whether it is diagonal or zigzag without losing the spring property. . The present invention
is a cylindrical ring having a horizontal flat portion at the upper end and slits in the longitudinal
direction by providing slits in the longitudinal direction, the outer diameter of which is larger
than the inner diameter of the voice coil bobbin, and the lower portion of the cylinder Abnormal
noise such as flicker caused by the open gap between the voice coil cap and the voice coil bobbin
by completely fixing the flat plate and the voice coil bobbin by the voice coil cap inserted without
any gap in the inner peripheral surface of the voice coil bobbin? It can be prevented, and a flat
panel speaker with good acoustic characteristics and excellent productivity can be realized.
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2
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a sectional view of an essential part of a flat plate skater according to an embodiment of
the present invention, FIG. 2 is a perspective view of a voice coil cap of a part thereof, and FIG. 3
is a sectional view of an essential part of a conventional flat panel loudspeaker.
5 ииииии Flat plate diaphragm, 6 иииииии Voice coil cap, 7 ииииии Voice coil bobbin, 8 иииии Voice coil, 9
ииииииииииииииии . Name of Agent Attorney Nakao Toshio and 1 other 5-man * v3p?--ind) Square ?
Figure 2-9-m-Slit f-Hirabayashi feather 5 VJJ ?
11-05-2019
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