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JPH08163693

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DESCRIPTION JPH08163693
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
dome type speaker which is used in various kinds of audio equipment to convert an electrical
signal into acoustic vibration and a method of manufacturing the same.
[0002]
2. Description of the Related Art A conventional dome-shaped speaker of this type will be
described with reference to FIGS.
[0003]
FIG. 2 is a half sectional front view showing a conventional dome-shaped speaker, in which 1 is a
lower plate, 2 is a magnet, 3 is an upper plate, 4 is a voice coil, 5 is a dome-shaped diaphragm,
and 7 is a resin It is a ring.
[0004]
Further, in the conventional method of manufacturing a dome-shaped speaker configured as
described above, the voice coil 4 and the inner diameter thereof are guided in a separate step,
and the dome-shaped diaphragm 5 is bonded and bonded with an adhesive. After that, the inside
diameter of the voice coil 4 is used as a guide to accurately cut and cut the outside diameter of
the dome-shaped diaphragm 5.
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1
[0005]
Next, the dome-shaped diaphragm 5 to which the voice coil 4 is bonded is inserted on the inner
diameter side of the resin ring 7 bonded to the top plate 3 of the magnetic circuit in advance, and
the voice coil 4 is disposed in the gap of the magnetic circuit. It was intended to be
[0006]
FIG. 3 is a half sectional front view showing the structure of another conventional dome-shaped
speaker, in which 1 is a lower plate, 2 is a magnet, 3A is an upper plate, 4 is a voice coil, and 5 is
a dome A diaphragm 8, a ring 8 made of a resin or an aluminum material, and a projection pin 9
center-guides a plurality of vibration system parts which are projected onto the upper plate 3A.
[0007]
Further, in the method of manufacturing the conventional dome-shaped speaker configured in
this way, the voice coil 4, the dome-shaped diaphragm 5, and the ring 8 are bonded together in a
separate step using the inner diameter of the voice coil 4 as a guide. After drying, the vibration
system parts assembled in the above separate steps are inserted by using the inside diameter
side of the projecting pin 9 of the upper plate 3A as a guide, and the voice coil 4 is disposed in
the gap of the magnetic circuit. The
[0008]
However, in the above-described conventional dome-shaped speaker structure and
manufacturing method, the method of the center guide in each process is changed in order to
center the voice coil 4 in the gap of the magnetic circuit. As a result, the center is eccentric as a
vibration system component assembly and the voice coil 4 is attached to the upper plate 3, 3A
and the lower plate 1 constituting the magnetic circuit. There is a drawback that it generates an
abnormal sound upon contact.
[0009]
Further, in the conventional manufacturing method, there is also a disadvantage that the
abnormal sound can be detected only in the final operation inspection step.
[0010]
The present invention solves the above-mentioned conventional problems, simplifies the
assembly of vibration system parts, arranges the voice coil in the center of the gap of the
magnetic circuit without eccentricity, and contacts the voice coil with the upper and lower plates.
It is an object of the present invention to provide a dome-shaped speaker capable of eliminating
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2
abnormal noise and a method of manufacturing the same.
[0011]
SUMMARY OF THE INVENTION In order to solve the above problems, a dome-shaped speaker
according to the present invention and a method of manufacturing the same according to the
present invention comprise a guide ring having an annular inner wall formed by bending an
inner peripheral portion into an L shape in cross section. , The voice coil and the dome-shaped
diaphragm are simultaneously bonded with an adhesive using the outer diameter of the voice coil
wire ring as a guide, and this vibration system component assembly is inserted into the magnetic
circuit It is a thing.
[0012]
With this configuration, the assembly of the vibration system components can be simplified, and
the voice coil can be disposed at the center of the gap of the magnetic circuit, so that abnormal
noise can be eliminated.
[0013]
In addition, the contact between the upper plate and the voice coil can be visually confirmed in
advance in the state of the vibration system component assembly.
[0014]
An embodiment of the present invention will be described below with reference to the drawings.
[0015]
FIG. 1 is a half sectional front view showing the structure of a dome-shaped speaker according to
the embodiment, in which 1 is a lower plate provided with a center pole portion, 2 is a ringshaped magnet, and 3 is a ring-shaped upper plate , 4 is a voice coil, 5 is a dome-shaped
diaphragm, 6 is a guide ring, and is composed of the above components.
[0016]
Next, a method of manufacturing the dome-shaped speaker according to the embodiment
configured as described above will be described.
[0017]
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First, in the preparation step, the three components of the voice coil 4, the dome-shaped
diaphragm 5, and the guide ring 6 are bonded and bonded with an adhesive.
At this time, using the outer diameter of the wire ring portion wound around the voice coil 4 as a
guide to bring out the center of the voice coil 4, a jig is provided so that a gap can be taken at a
constant interval from this and the inner diameter of the guide ring 6 Insert and dry, remove the
jig after drying.
As a result, on the circumference of the wire ring portion outer diameter of the voice coil 4 and
the inner diameter side of the guide ring 6, a gap having a constant distance can be secured.
[0018]
The vibration system component assembly completed in this manner is inserted into the
magnetic circuit.
At this time, the voice coil 4 can be disposed at the center in the gap of the magnetic circuit by
inserting the outer diameter of the guide ring 6 into the inner diameter of the upper plate 3 by
fitting. It is extremely easy to obtain a dome-shaped speaker free from abnormal noise due to the
contact of
[0019]
According to the dome-shaped speaker of the present invention thus constructed, it is possible to
provide a gap at a constant distance on the circumference between the outer diameter of the
annulus portion of the voice coil and the inner diameter of the guide ring. The occurrence of
abnormal noise due to the contact of the upper plate or the lower plate is eliminated.
[0020]
Further, the eccentricity of the voice coil can be visually confirmed in the state of the vibration
system component assembly, and defective products can be sorted in advance.
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[0021]
Furthermore, the guide ring may be a processed hot-rolled steel plate having a thickness t of 0.6
to 1.0 mm, and the magnetic circuit of the present invention can be used more than the top plate
of the dome-shaped speaker of the conventional structure. The material of the upper plate to be
formed can be reduced by a size corresponding to the thickness of the guide ring, and the cost
reduction effect can also be obtained.
[0022]
Brief description of the drawings
[0023]
FIG. 1 A half sectional front view showing the structure of a dome-shaped speaker according to
an embodiment of the present invention
[0024]
Fig. 2 A half sectional front view showing the structure of a conventional dome-shaped speaker
[0025]
Fig. 3 A half sectional front view showing the structure of a conventional dome-shaped speaker
[0026]
Explanation of sign
[0027]
1 lower plate 2 magnet 3 upper plate 4 voice coil 5 dome-shaped diaphragm 6 guide ring
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