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DESCRIPTION JP2003339099

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DESCRIPTION JP2003339099
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker used for various audio devices and information communication devices.
[0002]
2. Description of the Related Art A conventional speaker will be described with reference to FIG.
[0003]
FIG. 5 shows a cross-sectional view of a conventional speaker.
[0004]
As shown in FIG. 5, the magnetized magnet 1 is sandwiched between the upper plate 2 and the
yoke 3 to form an internal magnetic circuit 4.
The frame 6 is coupled to the yoke 3 of the magnetic circuit 4, and the diaphragm 7 is bonded to
the peripheral portion of the frame 6.
The voice coil 8 coupled to the diaphragm 7 is centrally held by the damper 9 and coupled so as
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to fit in the magnetic gap 5 of the magnetic circuit 4.
[0005]
The above-described speaker is intended to be thin, and if the amplitude stroke of each
component is designed to be small in order to achieve thinness, the voice coil 8 is largely
amplified. The damper 9 is in contact with the yoke 3 of the magnetic circuit 4 to generate an
abnormal sound.
[0006]
The present invention solves the above-mentioned subject, and provides an excellent speaker
which can realize thinning.
[0007]
In order to solve the above problems, the present invention has the following constitution.
[0008]
In the invention according to claim 1 of the present invention, the yoke is provided with at least
one or more through holes, one of the dampers is coupled to the frame, and the other is
supported below the voice coil after passing through the through holes of the yoke. Configured
to
With this configuration, even if the voice coil vibrates to a large extent, the damper does not
contact the yoke, and generation of abnormal noise can be prevented, and thinning can be
realized.
[0009]
The invention according to claim 2 of the present invention is a yoke having a through hole
formed by forming a slit on the side wall of a bottomed cylindrical wall and connecting a
magnetic pole portion made of a ring-shaped magnetic body on the upper side wall. It is
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2
With this configuration, thinning of the damper by preventing contact with the yoke can be
realized at low cost.
[0010]
According to the third aspect of the present invention, the plate-like magnetic body is coupled to
the lower side of the side wall portion made of the magnetic body having the upper magnetic
pole portion made of the cylindrical magnetic body and the lower slit. And a yoke having a
through hole formed therein.
With this configuration, thinning of the damper by preventing contact with the yoke can be
realized at low cost.
[0011]
In the invention according to the fourth aspect of the present invention, the material thickness of
the side wall portion in the configuration range of the slit or the through hole of the side wall
portion provided with the slit or the through hole is set to be thicker than the other yoke material
thick portion The speaker according to any one of claims 1 to 3 is configured using the yoke as
described above. With this configuration, even if a yoke having a side wall portion provided with
a slit or a through hole is used, magnetic saturation is prevented by setting the material thickness
of the side wall portion in the configuration range of the slit or the through hole thick. An
increase in pressure level can be realized.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be
described below with reference to the drawings.
[0013]
(First Embodiment) The invention according to the first aspect of the present invention will be
described with reference to the first embodiment.
[0014]
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FIG. 1 shows a cross-sectional view of the speaker according to the first embodiment of the
present invention.
[0015]
As shown in FIG. 1, the magnetized magnet 21 is sandwiched between an upper plate 22 and a
yoke 23 having three through holes 23a in the longitudinal direction to constitute an internal
magnetic circuit 24.
A frame 26 is coupled to the yoke 23 of the magnetic circuit 24, and a diaphragm 27 is bonded
to the periphery of the frame 26.
The voice coil 28 coupled to the diaphragm 27 is coupled so as to fit in the magnetic gap 25 of
the magnetic circuit 24.
At this time, the outer peripheral portion of the damper 29 is connected to the frame 26, and the
inner peripheral portion is connected to and supported below the voice coil 28 after passing
through the three through holes 23a of the yoke 23.
[0016]
With this configuration, even if the voice coil 28 vibrates up and down largely by applying a
large input, the damper 29 does not contact the yoke 23, and generation of abnormal noise can
be prevented.
[0017]
Also, the number of through holes 23a of the yoke 23 may be set to three or more, or more or
less.
Furthermore, it is also possible to freely set the number of parts of the dampers 29 to be passed
through the through holes 23a of the yoke 23 to be equal to or less than the number of through
holes 23a.
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[0018]
Furthermore, this configuration is configured to support the lower side of the voice coil 28 by the
damper 29, that is, to support the lower side of the drive unit which is the wire ring of the voice
coil 28, the edge of the diaphragm 27 and the damper By supporting the wire ring of the voice
coil 28 from above and below, the rolling can be extremely reduced, and the centering
performance can be significantly improved.
[0019]
Second Embodiment The second embodiment of the present invention will be described below
with reference to the second aspect of the present invention.
[0020]
FIG. 2 shows a cross-sectional view of a loudspeaker according to a second embodiment of the
present invention.
[0021]
The point different from the first embodiment is the configuration of the yoke 23A.
That is, the slit 23c is provided in the bottomed cylindrical side wall 23b, and the magnetic pole
portion 23d made of a ring-shaped magnetic body is coupled to the upper portion of the side
wall 23b, whereby the through hole 23a is formed of a two-part component. The yoke 23A is
used.
With this configuration, the processing step can be shortened and cost reduction can be realized
as compared with the one in which the through hole 23a is processed in the side wall of the yoke
23 by integral molding in FIG.
[0022]
Third Preferred Embodiment The third preferred embodiment according to the present invention
will be described below with reference to the third preferred embodiment.
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[0023]
FIG. 3 shows a cross-sectional view of a loudspeaker according to a third embodiment of the
present invention.
[0024]
The point different from the first embodiment is the configuration of the yoke 23B.
That is, the plate-like magnetic body 23h is coupled to the lower side of the side wall 23g made
of a magnetic body having an upper magnetic pole portion 23e made of a cylindrical magnetic
body and a lower slit 23f. The yoke 23B in which the through hole 23a is formed by the
following components is configured.
By this configuration, the processing steps can be shortened, and cost reduction can be realized.
[0025]
Fourth Embodiment The fourth embodiment of the present invention will be described with
reference to the fourth aspect of the present invention.
[0026]
FIG. 4 shows a cross-sectional view of a loudspeaker according to a fourth embodiment of the
present invention.
[0027]
The point different from the first embodiment is the configuration of the yoke 23J.
That is, the yoke 23J is set such that the material thickness of the side wall portion 23b in the
configuration range of the slit 23c or the through hole 23a of the side wall portion 23b provided
with the slit 23c or the through hole 23a is thicker than other yoke material thick portions Is
used.
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With this configuration, even if the yoke 23J having the side wall portion 23b provided with the
slit 23c or the through hole 23a is used, the material thickness of the side wall portion 23b in the
configuration range of the slit 23c or the through hole 23a is set thick. The magnetic saturation
can be prevented to improve the sound pressure level.
[0028]
As described above, in the loudspeaker according to the present invention, the yoke is provided
with a through hole, a part of the damper is passed through the through hole, one is coupled to
the frame, and the other is supported below the voice coil. It is something like that.
With this configuration, even if the voice coil vibrates to a large extent, the damper does not
contact the yoke, and generation of abnormal noise can be prevented, and thinning can be
realized.
[0029]
Thus, the present invention can provide an excellent speaker capable of achieving thinning, and
its industrial value is extremely large.
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