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JPH0560091

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DESCRIPTION JPH0560091
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker magnetic circuit used in various audio equipment.
[0002]
2. Description of the Related Art In recent years, various audio devices typified by speakers are
increasingly required to have high output and high sound quality, and in addition, the size of invehicle or portable audio devices is reduced. , Weight reduction is becoming an important issue.
For this purpose, it is necessary to drive the diaphragm efficiently. One of the methods is to
increase the magnetic flux passing through the voice coil, that is, to increase the magnetic flux
density in the gap.
[0003]
As shown in FIG. 5, the conventional speaker magnetic circuit comprises a magnet 23 provided
between the plate 21 and the center pole 22 and a center pole for fixing the speaker magnetic
circuit to the magnetic circuit mounting portion 24 of the enclosure. A screw hole 25 provided
on the back surface of the housing 22 and a screw 26 fitted in the screw hole 25 to fix the
speaker magnetic circuit to the magnetic circuit mounting portion 24 of the enclosure. Further,
the cylindrical voice coil 28 attached to the outer periphery of the diaphragm 27 is located in the
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gap portion 29 between the plate 21 and the center pole 22 and a current flows in the voice coil
28. Is movable.
[0004]
However, in the above construction, the two fit together between the screw hole 25 provided on
the back surface of the center pole 22 and the screw 26 fitted in the screw hole 25. There is an
air gap which is necessary, and if magnetic flux flows in the vicinity of the air gap, the flow of the
magnetic flux is disturbed, as a result, the magnetic flux density of the gap 29 between the plate
21 and the center pole 22 is lowered. There was a point.
[0005]
The present invention solves the above-mentioned problems, and by preventing the flow of
magnetic flux in the vicinity of the air gap formed in the fitting portion between the screw and
the screw hole, the efficiency of preventing the reduction of the magnetic flux density in the gap
portion It provides an excellent magnetic circuit.
[0006]
The magnetic circuit for a speaker according to the present invention is provided on a plate, a
center pole, a magnet provided between the plate and the center pole, and either the plate or the
center pole. A mounting hole for mounting on a frame or an enclosure, a mounting member for
mounting on the frame or the enclosure fitted with the mounting hole, and a magnetic fluid filled
in a gap between the mounting member and the mounting hole It is.
[0007]
Since the gap between the mounting hole and the mounting member is filled with the magnetic
fluid, no air gap is generated as in the conventional speaker magnetic circuit, and even when the
magnetic flux flows, the flow of the magnetic flux Without disturbing the magnetic flux density in
the gap between the plate and the center pole.
[0008]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present
invention will be described below with reference to FIGS.
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FIG. 1 is a cross-sectional view of the speaker magnetic circuit in the present embodiment cut in
the axial direction.
In FIG. 1, 1 is a plate, 2 is a center pole, 3 is a magnet provided between the plate 1 and the
center pole 2, 4 is a speaker magnetic circuit attachment portion of an enclosure, and 5 is
provided on the back of the center pole 2. A screw hole 6 is a screw that fits into the screw hole
5 to fix the speaker magnetic circuit to the magnetic circuit mounting portion 4 of the enclosure.
A magnetic fluid 7 is filled in the gap between the screw hole 5 and the screw 6.
A cylindrical voice coil 8 is attached to the outer periphery of the diaphragm 9 and is located in
the gap 10 between the plate 1 and the center pole 2.
[0009]
The operation of the magnetic circuit configured as described above will be described below.
First, a magnetic flux passing through the center pole 2, the gap 10, and the plate 1 from the
magnet 3 is generated. At this time, the magnetic flux flows in the vicinity of the fitting portion
between the screw hole 5 and the screw 6 in the center pole 2, but the magnetic fluid 7 is filled
in the gap between the screw hole 5 and the screw 6. The magnetic flux flows smoothly without
being generated, and the magnetic flux density of the gap portion 10 is not reduced. As described
above, when the magnetic field is generated in the gap 10 and the current flows in the voice coil
8, the voice coil 8 and the diaphragm 9 move.
[0010]
Furthermore, the result of having verified by magnetic field analysis which used FEM about the
effect of a present Example is shown in FIGS. FIG. 2 is a side sectional view showing the analysis
result of the magnetic flux flow in the axial direction in the case of the conventional speaker
magnetic circuit, and FIG. 3 is the flow of the magnetic flux in the axial direction in the speaker
magnetic circuit of this embodiment. It is side surface sectional drawing showing the analysis
result of. Further, FIG. 4 compares the magnitudes of the magnetic flux densities of the
conventional speaker magnetic circuit and the speaker magnetic circuit of the present
embodiment in the gap portion.
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[0011]
As a result, in the conventional speaker magnetic circuit as shown in FIG. 2, the disturbance of
the magnetic flux occurs near the screw fitting portion, but the disturbance of the magnetic flux
occurs in the speaker magnetic circuit of the present embodiment of FIG. It can be seen that the
magnetic flux flows smoothly, and that the value of the magnetic flux density of the speaker
magnetic circuit of this embodiment is larger than that of the conventional speaker magnetic
circuit in the gap portion.
[0012]
As described above, according to the present embodiment, the magnetic fluid in the space
between the screw hole 5 for attaching the speaker magnetic circuit and the screw 6 is filled with
the magnetic fluid, so that the magnetic flux near the screw hole 5 is not disturbed. Does not
reduce the magnetic flux density of
[0013]
As described above, according to the present invention, since the gap between the mounting hole
for mounting the speaker magnetic circuit to the frame or the enclosure and the mounting
member is filled with the magnetic fluid, the conventional speaker can be obtained. As in the case
of a magnetic circuit, there is no air gap in the fitting portion between the mounting hole and the
mounting member, and even if magnetic flux flows around this, the gap between the plate and
center pole is not disturbed without disturbing the flow of magnetic flux. Can realize an efficient
magnetic circuit without reducing the magnetic flux density of
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