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DESCRIPTION JPH03177199

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DESCRIPTION JPH03177199
[0001]
TECHNICAL FIELD The present invention relates to a speaker used for various audio devices.
PRIOR ART A conventional loudspeaker of this type has a configuration as shown in FIG. 3, FIG. 4
and FIG. That is, in FIG. 3, the frame 5 is joined by welding to the upper plate 2 of the magnetic
circuit 4 configured by sandwiching the magnet 1 from the upper plate 2 and the lower plate 3,
and the diaphragm 6 is attached to the periphery of the frame 5. The voice coil 7 for driving the
diaphragm 6 is coupled to the central portion of the diaphragm 6, and the voice coil 7 is held by
the damper 8 to be attached to the magnetic gap 9 of the magnetic circuit 4. The dust cap 1o is
adhered to the surface of the connecting portion of the diaphragm 6 with the voice coil 7 without
being eccentrically fitted. Further, in FIG. 4, the frame 5 is coupled to the upper plate 2 of the
magnetic circuit 4 by swaging, and the other configuration is the same as that of FIG. In FIG. 5,
the frame 5 having the dowel holes 12 is coupled to the upper plate 2 of the magnetic circuit 4
configured by sandwiching the magnet 1 by the upper plate 2 having the dowels 11 and the
lower plate 3 by high speed bins. The other configuration is the same as that shown in FIG.
Problems to be Solved by the Invention However, these conventional three types of speakers
have the following problems in each of them. In the method in which the frame 5 is joined to the
upper plate 2 of FIG. 3 by welding, iron powder is generated due to sparks at the time of welding,
which causes iron powder defects to occur frequently. Further, in the method of swaging the
frame 5 to the upper plate 2 of FIG. 4, the coupling is not achieved when the weight of the
magnetic circuit 4 is large because the frame 5 is simply crimped to the upper plate 2. Was
occurring. Further, in the method of connecting the frame 5 to the upper plate 2 of FIG. 5 with a
nozzle, since the upper plate 2 has the dowels 11, many steps are required to manufacture the
upper plate 2 and the expensive upper plate It becomes 2. Also, the connection between the top
plate 2 and the frame 5 has a very long process as compared with the above-mentioned
connection method. The present invention solves these conventional problems and has a
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configuration capable of reducing defects due to the coupling between the top plate and the
frame, that is, defects due to iron powder defects and magnetic circuit coupling disconnection,
and is inexpensive. The purpose is to provide.
Means for Solving the Problems In order to solve the above-mentioned problems, the present
invention provides an annular portion provided so as to project downward below the central
portion of the bottom surface of the metal frame from the inner diameter portion of the upper
plate to the bottom surface of the upper plate. The speaker is configured by using a configuration
in which the configuration to be crimped and coupled to the enveloping shape is used. Operation
With the above-described configuration, it is possible to avoid iron powder defects that occur
frequently in the welding method because welding is not performed, and the upper plate is
surrounded by the frame due to its structure even when using a heavy magnetic circuit. As a
result, the connection between the top plate and the frame does not occur. In addition, it is
possible to reduce the number of connection failures at low cost without the need for additional
steps in the fabrication of the upper plate and the frame. Embodiment Hereinafter, a speaker
according to an embodiment of the present invention will be described with reference to the
drawings. As shown in FIG. 1, an annular portion 20 provided so as to project downward from
the central portion of the bottom surface of the frame 19 made of metal is fitted into the inner
diameter portion 22 of the upper plate 21, and the bottom surface of the upper plate 21. The
magnet 24 and the lower plate 25 are bonded with an adhesive to the assembly 23 of the frame
19 and the upper plate 21 which are caulked and joined in a shape that encloses the magnetic
circuit 26 to form a housing 26 with a magnetic circuit. The peripheral portion of the diaphragm
27 is adhered to the peripheral portion of the frame 19 with an adhesive, and the voice coil 28
for driving the diaphragm 27 is coupled to the central portion of the diaphragm 27. Is centerheld by the damper 29, and the lower portion of the voice coil 28 is fitted into the magnetic gap
30 without eccentricity, and the voice coil 2 of the diaphragm 27 is Constitute a speaker by
bonding a dust cap 31 to the surface of the coupling portion between. Next, the process of
connecting the frame 19 and the upper plate 21 is shown in FIGS. As shown in FIG. 2, an annular
portion 20 provided at the central portion of the bottom surface of the frame 19 made of metal
as shown in FIG. 2a is passed through the inner diameter portion 22 of the upper plate 21 as
shown in FIG. The annular portion 20 is inclined outward from the inner diameter portion 22 of
the upper plate 21 by the mold 32, and the annular portion 20 is crimped and coupled in a shape
that wraps the bottom surface of the upper plate 21. As described above, according to the
present invention, the frame and the upper plate made of metal are not joined by welding, and as
a result, not only iron powder defects frequently occur in the conventional welding method but
also the annular portion of the frame is made The caulking from the inner diameter portion to
the shape that encloses the upper plate does not cause a defect due to misalignment that
occurred when using a heavy magnetic circuit in the conventional swaging method.
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In addition, the frame and top plate to be used do not need to be specially added in the process,
and defects due to the connection between the top plate and the frame can be reduced.
Furthermore, the material thickness portion of the frame is a part of the top plate Since it is
possible to use as a speaker, the material thickness of the upper plate can be reduced, and an
inexpensive speaker can be provided.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a cross-sectional view of a speaker according to an embodiment of the present invention,
FIG. 2 is a cross-sectional view of an upper plate and frame coupling step according to an
embodiment of the present invention, and FIG. 3 is a conventional upper plate and frame. Fig. 4
is a cross-sectional view of the speaker when the conventional upper plate and the frame are
connected by the swaging method. Fig. 5 is a cross-sectional view of the conventional upper plate
and the frame. It is sectional drawing of the speaker at the time of couple | bonding by a highspeed system.
19 ...... frame, annulus 20 ...... frame, 21 ...... upper plate, the inner diameter of 22 ...... top plate, 23
..... · Assembly of frame and upper plate, 24 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · housing
with magnetic circuit, 27 · · · · · · · · 28 Voice coil 29 Damper 30 Magnetic gap 31 Dust cap 32
Mold.
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