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DESCRIPTION JPH04128496

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DESCRIPTION JPH04128496
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker used for various audio devices.
[0002]
2. Description of the Related Art A conventional cone-shaped speaker has a structure as shown in
the cross-sectional view of FIG. In FIG. 3, 1 is a top plate made of iron and having a flat top
surface. Reference numeral 3 denotes a lower plate having a center pole 3a made of iron, and the
upper surface of the center pole 3a is flat. A ring-shaped magnet 2 is sandwiched between an
upper plate 1 and a lower plate 3 to constitute a magnetic circuit 4. A frame 5 is coupled to the
magnetic circuit 4, an edge of a cone-shaped diaphragm 6 is coupled to a peripheral portion of
the frame 5, and a voice coil 7 is coupled to a central portion of the diaphragm 6. The middle
portion of the coil 7 is held by the damper 8 and the lower portion of the voice coil 7 is fitted
into the magnetic gap 9 of the magnetic circuit 4 without eccentricity, and the dust cap 10 is
attached to the upper surface of the central portion of the diaphragm 6.
[0003]
In such a speaker, the upper surface of the center pole 3a of the upper plate 1 and the lower
plate 3 has a flat shape, so an excessive input is applied and a large amplitude is generated.
When this happens, the voice coils 7 get out of the magnetic gap 9 and run on their flat portions,
causing the voice coil 7 to burn.
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[0004]
The present invention solves the above-mentioned conventional problems, and aims to prevent
the upper plate or the lower plate of the voice coil from running on the center pole.
[0005]
SUMMARY OF THE INVENTION In order to solve this problem, the present invention is directed
to the voice coil side along the inner diameter of the upper surface of the upper plate and
additionally to the upper surface of the center pole of the lower plate. And a nonmagnetic guide
having an inclined surface attached thereto.
[0006]
By this configuration, since the voice coil strikes the inclined surface and slides down, it is
possible to prevent the upper plate and the center pole from getting on.
[0007]
DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will
be described below with reference to the drawings.
FIG. 1 shows a first embodiment of the present invention. In FIG. 1, 11 is a ring-shaped upper
plate made of iron, 12 is a ring-shaped magnet in the same manner, 13 is a lower plate having a
center pole 14 The magnetic circuit 15 is composed of these.
A guide 16 made of nonmagnetic material and having an inclined surface on the inner side
surface is attached to the upper part of the inner peripheral edge of the top plate 11 of the
magnetic circuit 15.
A frame 17 is attached to the upper surface of the magnetic circuit 15, an edge of a cone-shaped
diaphragm 18 is fixed to a peripheral portion of the frame 17, and a voice coil 19 is coupled to a
central portion of the diaphragm 18. The middle part of the voice coil 19 is held by the damper
20, the lower part of the voice coil 19 is fitted into the magnetic gap of the magnetic circuit 15
without eccentricity, and the dust cap 22 is attached to the center of the upper surface of the
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diaphragm 18 Speakers are configured.
[0008]
As described above, according to the present embodiment, since the guide 16 is attached along
the inner diameter of the upper plate 11, even if the voice coil 19 is about to ride on the upper
plate 11, It is designed to slide down on an inclined surface.
Therefore, even if a large amplitude occurs, the upper plate 11 can not get on.
[0009]
Further, by using aluminum or the like for the guide 16, the heat radiation effect of the voice coil
19 can also be obtained.
[0010]
Next, a second embodiment of the present invention will be described with reference to the
drawings.
In FIG. 2, the same parts as the parts shown in FIG.
[0011]
In this embodiment, a nonmagnetic guide 23 having a sloped surface is attached to the upper
portion of the center pole 14 of the lower plate 13 on the voice coil 19 side.
[0012]
With this structure, it is possible to cope with the case where the voice coil 19 deviates from the
magnetic gap 21 more largely.
[0013]
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As described above, according to the present invention, by mounting a nonmagnetic guide along
the inner peripheral edge of the upper surface of the upper plate, it is possible to prevent the
voice coil from running on.
Furthermore, by attaching a guide also to the upper part of the center pole of the lower plate, it is
possible to obtain the effect of preventing the riding even when there is a large displacement of
the voice coil to the outside. It can be a speaker rich in sex.
[0014]
Brief description of the drawings
[0015]
1 is a cross-sectional view of the speaker in the first embodiment of the present invention
[0016]
2 is a cross-sectional view of the speaker in the second embodiment of the present invention
[0017]
Fig. 3 Cross section of the conventional speaker
[0018]
Explanation of sign
[0019]
11 upper plate 12 magnet 13 lower plate 14 center pole 15 magnetic circuit 16 guide 17 frame
18 diaphragm 19 voice coil 20 damper 21 magnetic gap 23 guide
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