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DESCRIPTION JP2003179995

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DESCRIPTION JP2003179995
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
magnetic circuit of a speaker, and more particularly to a magnetic circuit of a speaker in which a
bass speaker and a middle to high-tone speaker are integrally formed.
[0002]
2. Description of the Related Art An example of a speaker in which a middle to high-tone speaker
is mounted on a bass speaker using a conventional repulsive magnetic circuit will be described
with reference to FIG. The base 1 and the plate-like frame 2 shown in the figure are fixed to form
a speaker support. The base 1 is made of a nonmagnetic material.
[0003]
The magnet 3 and the magnet 21 are fixed to the base 1 so that the magnetic poles face each
other with the yoke 6 interposed therebetween, and the outer ring 8 made of a magnetic material
is fixed at a position facing the yoke 6. These members constitute a repulsive magnetic circuit,
and the voice coil bobbin 14 is supported by the plate-like frame 2 via the damper 12 so that the
voice coil 16 wound around the voice coil bobbin 14 is positioned to the magnetic flux of the
repulsive magnetic field. ing.
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[0004]
The outer periphery of the woofer diaphragm 10 is supported by the plate-like frame 2, and the
inner periphery is bonded to the voice coil bobbin 14. Although the woofer is configured in this
way, a tweeter is fastened to the top of the base 1.
[0005]
The magnetic circuit of the tweeter is composed of a yoke 24, a magnet 25 and a top plate 26
integrally fixed, and the voice coil 17 wound around the voice coil bobbin 15 is positioned in the
magnetic gap between the top plate 26 and the yoke 24. The voice coil bobbin 15 is supported
by the yoke 24 via the damper 13 so that The outer periphery of the tweeter diaphragm 11 is
fixed to the voice coil bobbin 15.
[0006]
The yoke 24 configured in this manner is fastened to the support 23, and the support 23 is fixed
to the support 22 fastened to the base 1. A dust cover 18 is attached between the diaphragm 10
and the yoke 24 to prevent dust from entering the space around the voice coil 16. Thus, the
woofer and the tweeter are integrally formed coaxially.
[0007]
SUMMARY OF THE INVENTION In the above-mentioned conventional speaker, the magnets of
the magnetic circuit of the woofer and the tweeter are constituted by different ones, the
utilization efficiency of the magnetomotive force is lowered, and parts such as a column are
required. Yes, the number of parts was high and the manufacturing cost was high.
[0008]
The present invention has been made in view of the above-described point, and the purpose
thereof is to make it possible to effectively utilize the magnetomotive force by sharing the
magnet for the bass speaker and the middle to high-tone speaker, It is an object of the present
invention to provide a speaker magnetic circuit which can be compactly constructed and can
reduce the number of parts.
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2
[0009]
According to the present invention, there is provided a magnetic circuit of a speaker according to
the present invention, which is a speaker in which a middle to high-tone speaker is mounted on a
bass speaker using a repelling magnetic circuit. A protrusion is formed on the upper side of the
magnet, a yoke for a low frequency speaker is fixed on the protrusion, a magnet is fixed on the
yoke, and the protrusion, the yoke and the magnet It forms the repulsive magnetic circuit.
[0010]
Further, in the magnetic circuit of the speaker, a groove is provided around the base end of the
protrusion.
[0011]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A loudspeaker according to an
embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view showing one side of a central axis of a loudspeaker according to a
first embodiment of the present invention.
The base 1 and the plate-like frame 2 shown in FIG. 1 are fixed to form a speaker support.
The base 1 is made of a nonmagnetic material.
[0012]
The magnet 3 and the magnet 4 are fixed to the base 1 so that the magnetic poles face each
other with the yoke 6 interposed therebetween, and the outer ring 8 made of a magnetic material
is fixed at a position facing the yoke 6.
These members constitute a repulsive magnetic circuit, and the voice coil bobbin 14 is supported
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by the plate-like frame 2 via the damper 12 so that the voice coil 16 wound around the voice coil
bobbin 14 is positioned to the magnetic flux of the repulsive magnetic field. ing.
[0013]
The outer periphery of the woofer diaphragm 10 is supported by the plate-like frame 2, and the
inner periphery is bonded to the voice coil bobbin 14. Although the woofer is configured as
described above, the tweeter is fixed to the upper part of the magnet 4.
[0014]
That is, the yoke 7 is fixed on the protrusion 4 a formed on the upper part of the magnet 4, and
the magnet 5 is fixed on the yoke 7. The magnetic poles of the magnet 4 and the magnet 5 are
arranged to face each other. The magnet 4, the yoke 7 and the magnet 5 constitute a repelling
magnetic circuit of a tweeter.
[0015]
A non-magnetic support ring 9 is fixed to the magnet 4. The voice coil bobbin 15 is supported by
the support ring 9 via the damper 13 so that the voice coil 17 wound around the voice coil
bobbin 15 is positioned to the repulsive magnetic flux of the tweeter. A dust cover 18 is attached
between the diaphragm 10 and the support ring 9 to prevent dust from entering the space
around the voice coil 16.
[0016]
Thus, although the woofer and the tweeter are integrally formed coaxially, the magnet 4
constitutes a magnetic circuit of the woofer and the tweeter, and the magnetomotive force is
effectively used. Also, no support post is required to support the tweeter, and the number of
parts is reduced.
[0017]
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4
FIG. 2 is a cross-sectional view showing one side of the central axis of a loudspeaker according to
a second embodiment of the present invention. In this example, the entire speaker is supported
by a frame 20 integrally formed of resin. The damper 12 supports the lower portion of the voice
coil bobbin 14. The inner periphery of the diaphragm 10 is fixed around the voice coil 16, and
the voice coil 16 is not provided with an outer ring. The other configuration is the same as that of
the first embodiment, and the detailed description will be omitted. Also in this example, the
magnet 4 constitutes a magnetic circuit of a woofer and a tweeter, and the same effect as that of
the first embodiment can be obtained.
[0018]
FIG. 3 is a cross-sectional view showing one side of the central axis of a loudspeaker according to
a third embodiment of the present invention. In this example, a groove 4b is provided around the
protrusion 4a of the magnet 4 of the first embodiment, and the tip of the voice coil bobbin 15 is
inserted in the groove 4b. Although the support ring 9 is fixed to the outside of the groove 4 b of
the magnet 4, the height of the support ring 9 can be made lower than in the first embodiment.
The other configuration is the same as that of the first embodiment, and the detailed description
will be omitted.
[0019]
FIG. 4 is a cross-sectional view showing one side of the central axis of a loudspeaker according to
a fourth embodiment of the present invention. In this example, a groove 4b is provided around
the protrusion 4a of the magnet 4 of the second embodiment, and the end of the voice coil
bobbin 15 is inserted into the groove 4b. Although the support ring 9 is fixed to the outside of
the groove 4b of the magnet 4, the height of the support ring 9 can be made lower than in the
second embodiment. The other configuration is the same as that of the second embodiment, and
the detailed description will be omitted.
[0020]
According to the magnetic circuit of the speaker of the present invention, since the magnet
common to the magnetic circuit of the speaker for the bass and the magnetic circuit of the
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speaker for the middle and high-pitched sound is used, the magnetomotive force of the magnet is
effectively used. Ru. In addition, a support for supporting the middle to high-pitched speaker is
not necessary, and the number of parts is reduced.
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