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DESCRIPTION JP2004120702

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DESCRIPTION JP2004120702
To provide a repulsive magnetic circuit of a speaker capable of increasing the magnetic flux
density of a magnetic gap. SOLUTION: Two magnets 1, 1 are arranged so that the same poles
face each other with a center plate 2 made of a magnetic material, and the magnetic material is
provided on the surface of the two magnets 1, 1 opposite to the center plate 2 Plates 3 and 3 are
respectively disposed, and outer rings 5a and 5b made of magnetic material disposed on the
outer peripheral side of the center plate 2 via magnetic gaps are extended to a position facing the
respective plates 3 and 3 In the repulsive magnetic circuit of the speaker, the inner diameter of
the surface of the outer rings 5a and 5b facing the plates 3 and 3 is smaller than the outer
diameter of the voice coil 6 disposed in the magnetic gap. [Selected figure] Figure 1
Repulsion magnetic circuit of speaker and method of assembling the same
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
repulsive magnetic circuit of a speaker, and more particularly to a repulsive magnetic circuit
having a high magnetic flux density. 2. Description of the Related Art An example of a
conventional repulsive magnetic circuit and a speaker using the same are shown in FIGS. 9 and
10. FIG. In the repulsive magnetic circuit shown in FIG. 10, the magnets 1, 1 are disposed so that
the same poles face each other so as to sandwich the disk-shaped center plate 2 formed of
magnetic material, and further, upper and lower sides of the magnets 1, 1 The plates 3 and 3
made of magnetic material are arranged in FIG. An outer ring 5 formed of a magnetic material is
disposed on the outer peripheral side of the center plate 2, the magnets 1, 1 and the plates 3, 3.
The above members are supported by the magnet holder 4. Above and below the center of the
center plate 2 are formed two looped magnetic fluxes passing through the center plate 2, the
outer ring 5, the plate 3 and the magnet 1. The voice coil 6 wound around the voice coil bobbin 7
is disposed in the magnetic gap between the center plate 2 and the outer ring 5. A speaker using
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such a repulsive magnetic circuit is shown in FIG. As shown in FIG. 9, the outer peripheral
portions of the damper 9 and the diaphragm 10 are fixed to the frame 8 fixed to the magnet
holder 4, and the inner peripheral portions of the damper 9 and the diaphragm 10 are bonded to
the voice coil bobbin 7. Further, a dustproof cap 11 is bonded to the diaphragm 10 so as to cover
the upper portion of the voice coil bobbin 7. In the repulsive magnetic circuit proposed in
Japanese Patent Application Laid-Open No. 9-27997, a part of the center plate or the outer ring
is formed of a magnet in order to increase the magnetic flux density of the magnetic gap. [Patent
Document 1] Japanese Patent Application Laid-Open No. 9-27997 (page 3, FIG. 3, FIG. 4) [0007]
In the conventional repulsive magnetic circuit described above, the inner diameter of the outer
ring 5 is Since the diameter is larger than the outer diameter of the voice coil 6, the gap between
the outer ring 5 and the plate 3 is large, the magnetic resistance of the magnetic loop is
increased, and the magnetic flux density of the magnetic gap can not be increased. When the
magnetic flux density of the magnetic gap is low, the power consumption for generating a
predetermined volume increases. The present invention has been made in view of the abovedescribed point, and an object thereof is to provide a repulsive magnetic circuit of a speaker
capable of increasing the magnetic flux density of the magnetic gap and a method of assembling
the same. It is in.
Means for Solving the Problems In the repelling magnetic circuit of the speaker according to the
present invention, two magnets are arranged so that the same poles face each other with a center
plate made of a magnetic material, A plate made of a magnetic material is disposed on the
surface opposite to the center plate, and an outer ring made of a magnetic material disposed on
the outer peripheral side of the center plate with a magnetic gap to a position facing the
respective plates In the repulsive magnetic circuit of the extended speaker, the inner diameter of
the surface of the outer ring facing the plate is smaller than the outer diameter of the voice coil
disposed in the magnetic gap. Further, in the repulsive magnetic circuit of the speaker, the outer
ring is divided into two upper and lower outer rings in a plane orthogonal to the central axis at a
portion of the largest inner diameter. In the method for assembling a repulsive magnetic circuit
of the speaker, a first jig is interposed between the center plate and the lower outer ring to make
the center plate and the lower outer ring a magnet. Then, a second jig is disposed between the
center plate and the voice coil bobbin wound with the voice coil, and a third jig is disposed
between the voice coil bobbin and the upper outer ring. A jig is disposed to position the voice coil
bobbin and the upper outer ring with respect to the magnet holder. DESCRIPTION OF THE
PREFERRED EMBODIMENT A repulsive magnetic circuit which is an embodiment of the present
invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view
showing a repulsive magnetic circuit of a speaker according to an embodiment of the present
invention. In FIG. 1, the same members as those of the conventional repulsive magnetic circuit
described with reference to FIG. 10 are denoted by the same reference numerals, and the detailed
description thereof will be omitted. In the embodiment, the outer ring 5 of the conventional
example is replaced by two divided outer rings 5 a and 5 b. The outer rings 5 a and 5 b are L-
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shaped in cross section, and their end portions project toward the plate 3. The positional
relationship between the upper outer ring 5b and the voice coil 6 is shown in FIG. Assuming that
the minimum inner diameter of the outer ring 5 b is Rr, the outer diameter of the voice coil
bobbin 7 is Rb, and the outer diameter of the voice coil 6 is Rv, the relationship of Rv> Rr> Rb is
established. The lower outer ring 5a has the same shape as the upper outer ring 5b.
As described above, since the minimum inner diameter of the outer ring 5b is smaller than the
outer diameter of the voice coil 6, the gap between the outer rings 5a and 5b and the plates 3
and 3 can be reduced, and the magnetic flux density can be increased. A frame, a diaphragm, a
damper and a cap are attached to the magnet holder 4 of this magnetic circuit as in the
conventional example, and a speaker is completed. FIG. 8 shows the distribution of magnetic flux
density of the repulsive magnetic circuit of the embodiment and the conventional repulsive
magnetic circuit. As shown in FIG. 8, in the center of the center plate, the magnetic density of the
embodiment is increased by about 10% as compared with the prior art. The magnetic flux density
of the reverse magnetic field is about 70% higher than that of the conventional one in the
embodiment, but if the reverse magnetic field is out of the range of the voice coil vibration, it
does not affect the efficiency of the speaker. A method of assembling the repulsive magnetic
circuit according to the embodiment will be described with reference to FIGS. As shown in FIG. 3,
the plate 3, the magnet 1, the center plate 2, the magnet 1 and the plate 3 are sequentially
stacked, adhered and fixed to the magnet holder 4. Furthermore, the outer ring 5 a is inserted
into the magnet holder 4. Next, as shown in FIG. 4, the first jig 12 is inserted between the center
plate 2 and the outer ring 5 a to position the outer ring 5 a, and the outer ring 5 a is bonded to
the magnet holder 4. Next, the first jig 12 is taken out, and as shown in FIG. 5, the second jig 13
with the voice coil bobbin 7 placed thereon is fitted to the center plate 2. As shown in FIG. 6, the
third shaft 14 is covered on the voice coil bobbin 7 and the second jig 13 arranged as described
above. Then, as shown in FIG. 7, the outer ring 5 b is inserted between the magnet holder 4 and
the third jig 14. The outer ring 5 b thus positioned by the third jig 14 is bonded to the magnet
holder 4. Next, the third jig 14 is removed, and the voice coil bobbin 7 is bonded to the damper
and the diaphragm in a state where the voice coil bobbin 7 is positioned by the second jig.
Although the embodiment is configured as described above, the invention is not limited thereto.
For example, as the outer ring, one having two different dimensions may be used. Alternatively,
an integral outer ring may be attached simultaneously with the voice coil. According to the
repulsive magnetic circuit of the present invention, the magnetic flux density can be increased,
and the efficiency of the speaker can be enhanced.
Further, according to the method of assembling a repulsive magnetic circuit of the present
invention, the center plate, the outer ring and the like can be accurately positioned. BRIEF
DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing a repulsive magnetic
circuit of a speaker according to an embodiment of the present invention. FIG. 2 is a cross-
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sectional view showing a part of the repulsive magnetic circuit. FIG. 3 is a cross-sectional view
showing a method of assembling the same repelling magnetic circuit. FIG. 4 is a cross-sectional
view showing a method of assembling the same repelling magnetic circuit. FIG. 5 is a crosssectional view showing a method of assembling the same repelling magnetic circuit. FIG. 6 is a
cross-sectional view showing a method of assembling the same repelling magnetic circuit. FIG. 7
is a cross-sectional view showing the method of assembling the same repelling magnetic circuit.
FIG. 8 is a graph showing the magnetic flux density of the repulsive magnetic circuit of the
embodiment and the conventional repulsive magnetic circuit in comparison. FIG. 9 is a crosssectional view showing an example of a speaker using a conventional repulsive magnetic circuit.
FIG. 10 is a cross-sectional view showing the same repelling magnetic circuit. Explanation of
symbols 1 magnet 2 center plate 3 plate 4 magnet holder 5, 5a, 5b outer ring 6 voice coil 7 voice
coil bobbin 8 frame 9 damper 10 diaphragm 11 cap 12 first jig 13 second jig 14 Third jig
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