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JPH09247794

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JPH09247794
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker magnetic circuit used for a speaker such as an electric apparatus.
[0002]
2. Description of the Related Art Conventionally, an oval voice coil is used as a magnetic circuit
such as an oval speaker used for a television, a personal computer, etc., and an inner magnet type
of a rectangular magnet is used to prevent external leakage of magnetism. .
[0003]
FIG. 9 shows a speaker magnetic circuit for an inner magnet type in a conventional example such
as an oval speaker used for a television, a personal computer or the like.
In the figure, the magnetic circuit 30 comprises a rectangular yoke 21, a rectangular magnet 22
and a rectangular pole 24. A magnetic gap g is formed between the yoke 21 and the pole 24 for
inserting a voice coil. The magnetic flux from the magnet 22 returns to the magnet 22 through
the pole 24, the magnetic gap g and the yoke 21 as shown by the arrows.
[0004]
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1
However, in the conventional inner-magnet type, since the magnet is inside the voice coil, the size
of the magnet is limited, and there is a problem that the magnetic flux in the magnetic gap is
insufficient.
[0005]
The present invention has been made in view of these points, and it is an object of the present
invention to provide an internal magnet type speaker magnetic circuit in which the shortage of
magnetic flux in the magnetic gap is eliminated.
[0006]
[Means for Solving the Problems] The magnet and the upper yoke are further arranged on the
magnet and the pole of the conventional structure, and the two opposing magnet surfaces have
the same polarity so that the so-called repulsive magnetic field method is insufficient.
Compensates for the magnetic flux.
That is, one side yoke fixed to one side orthogonal to the longitudinal direction of the bottom
surface of the yoke and one end of the upper yoke is newly provided, or two sides orthogonal to
the longitudinal direction of the bottom surface of the yoke and both ends of the upper yoke Two
newly attached side yokes are provided to form a magnetic circuit of the newly added magnet.
The magnetic flux from the conventional magnet passes through the pole, the magnetic gap and
the yoke. The magnetic flux from the added magnet passes through the pole, the magnetic gap,
the yoke, the side yoke, and the upper yoke. As described above, sufficient magnetic flux can be
obtained by passing the magnetic flux of two magnets through one magnetic gap. That is, the size
of the magnet, which has been limited to be inside the voice coil, is solved in the height direction.
[0007]
DESCRIPTION OF THE PREFERRED EMBODIMENTS The speaker magnetic circuit according to
the present invention is a speaker magnetic circuit for use in a speaker such as an electric
apparatus, which comprises bent portions provided on two sides of a rectangular bottom surface
1a and a bottom surface 1a in the longitudinal direction. A yoke 1b and a magnet A2, a pole 4, a
magnet B3 and an upper yoke 5 disposed in order from the bottom to the yoke 1 and a side fixed
to the side orthogonal to the longitudinal direction of the bottom surface 1a and the end of the
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upper yoke 5 It is composed of the yoke 6 to form two parallel magnetic gaps g between the pole
4 and the bent portion 1b, and the magnet A2 and the magnet B3 arranged so as to sandwich the
pole 4 repel each other. The magnet is magnetized in the thickness direction, and the magnetic
flux from the magnet A2 passes through the pole 4, the magnetic gap g, the yoke 1, and the
magnetic flux from the magnet B3 is the pole 4, the magnetic gap , Characterized in that the yoke
1, side yokes 6 was arranged to pass the upper yoke 5.
[0008]
An embodiment of the present invention will be described below with reference to the drawings.
FIG. 8 is a perspective view of a yoke used in the first embodiment of the present invention. The
bottom surface 1a of the yoke 1 is rectangular, and a bent portion 1b is provided on two sides in
the longitudinal direction substantially perpendicular to the bottom surface 1a. A protrusion 1c is
provided on the upper inside of the bent portion 1b to form a magnetic gap with a pole described
later. Further, an extension 1d is provided on one side orthogonal to the longitudinal direction of
the bottom surface 1a, and is used as a fixed position with a side yoke described later.
[0009]
FIG. 1 is a perspective view of a speaker magnetic circuit according to a first embodiment of the
present invention. In the figure, 1 is a rectangular yoke described in FIG. 8, 6 is a side yoke with
an I-shaped cross section, 2 is a rectangular magnet A, 3 is a rectangular magnet B, 4 is a
rectangular pole, and 5 is a rectangular upper yoke And 10 is a magnetic circuit showing the
entire configuration. The arrows in the figure indicate the direction of the magnetic flux. The
magnet A2 and the magnet B3 generate repulsive magnetic fields whose two opposing surfaces
have the same polarity. The side yoke 6 is fixed to one side of the yoke 1 and one end of the
upper yoke 5.
[0010]
According to the above configuration, the magnetic flux from the magnet A 2 passes through the
pole 4, the magnetic gap g formed between the pole 4 and the yoke 1, and the yoke 1. The
magnetic flux from the magnet B3 passes through the pole 4, the magnetic gap g, the yoke 1, the
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side yoke 6, and the upper yoke 5. Thus, sufficient magnetic flux density can be obtained by
passing the magnetic flux of two magnets through one magnetic gap g.
[0011]
FIG. 2 is a cross-sectional view taken along the line AA in FIG. 1 and clearly shows the path of the
magnetic flux from the magnet A2. The configuration is the same as that of FIG. 1 and the same
reference numerals are used, and thus the detailed description will be omitted. The arrows in the
figure indicate the direction of the magnetic flux.
[0012]
FIG. 3 is a cross-sectional view taken along a line BB in FIG. The magnetic flux from the magnet
B3 passes through the pole 4 and the magnetic gap g to reach the yoke 1 (not shown). Further,
the magnetic flux passes through the bottom surface 1 a of the yoke 1, the side yoke 6, and the
upper yoke 5. The configuration is the same as that of FIG. 1 and the same reference numerals
are used, and thus the detailed description will be omitted. The arrows in the figure indicate the
direction of the magnetic flux. Although the example demonstrated the case where the cross
section used the I-shaped side yoke 6, it is also possible to use the side yoke whose L-shaped
cross section. In this case, the extension 1d of the yoke 1 described with reference to FIG. 8 is
unnecessary.
[0013]
FIG. 4 is a perspective view of a speaker magnetic circuit according to a second embodiment of
the present invention. In the figure, 11 is a yoke. The yoke 11 is provided with extension portions
1 d on two sides orthogonal to the side in the longitudinal direction of the bottom surface 1 a of
the yoke 1 described with reference to FIG. 8. . Reference numeral 15 is a rectangular upper
yoke, and reference numeral 20 is a magnetic circuit showing the entire configuration. In the
first embodiment, one side yoke 6 is used, but in the second embodiment, two are used. The
arrows indicate the direction in which the magnetic flux from the magnet B 3 passes, and the
magnetic flux passes through both of the two side yokes 6.
[0014]
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4
FIG. 5 is a cross-sectional view taken along a line CC in FIG. The magnetic flux from the magnet
B3 passes through the pole 4 and the magnetic gap g to reach the yoke 11 (not shown). Further,
the magnetic flux passes through the bottom of the yoke 11, the two side yokes 6, and the upper
yoke 15. Therefore, compared to the first embodiment, the reluctance decreases, and the balance
of the magnetic flux density in the magnetic gap g also improves. Although the example
demonstrated the case where the cross section used the I-shaped side yoke 6, it is also possible
to use the side yoke whose L-shaped cross section. In this case, the extension 1d of the yoke 1
described with reference to FIG. 8 is unnecessary.
[0015]
FIG. 6 is a perspective view showing a state in which a voice coil is provided in the speaker
magnetic circuit in the first embodiment of the present invention. In the example, the shape of
the voice coil is track-like. As shown, a cylindrical voice coil is inserted into a magnetic gap g
formed between the pole 4 and the yoke 1.
[0016]
FIG. 7 is a cross-sectional view of a loudspeaker using the loudspeaker magnetic circuit according
to the first embodiment of the present invention. In the figure, 9 is a voice coil inserted in the
magnetic gap g of the magnetic circuit 10, 8 is a diaphragm fixed to the voice coil 9, and 7 is a
damper for holding these. A sufficient magnetic flux can be obtained by the magnetic flux of two
magnets passing through one magnetic gap g.
[0017]
As described above, the speaker magnetic circuit according to the present invention comprises
the yoke 1 comprising the rectangular bottom surface 1a and the bent portions 1b provided on
two sides in the longitudinal direction of the bottom surface 1a, and the yoke 1 It consists of
magnet A2, pole 4, magnet B3 and upper yoke 5 which are disposed in order from the bottom,
and side yoke 6 fixed to the side perpendicular to the longitudinal direction of bottom surface 1a
and the end of upper yoke 5, Two parallel magnetic gaps g are formed between the curved
portions 1b, and the magnet A2 and the magnet B3 arranged sandwiching the pole 4 are
magnetized in the thickness direction so as to repel each other from the magnet A2 The magnetic
flux passes through the pole 4, the magnetic gap g and the yoke 1, and the magnetic flux from
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the magnet B 3 is the pole 4, the magnetic gap g, the yoke 1, the side yoke 6 and the upper yoke
5. Since the way through, it is possible to provide a speaker magnetic circuit of the magnetic type
among which overcomes the deficiency of the magnetic flux in the magnetic gap.
[0018]
Brief description of the drawings
[0019]
1 is a perspective view of the speaker magnetic circuit in the first embodiment of the present
invention.
[0020]
2 is a cross-sectional view taken along the line AA in FIG.
[0021]
3 is a cross-sectional view taken along the line BB in FIG.
[0022]
4 is a perspective view of the speaker magnetic circuit in the second embodiment of the present
invention.
[0023]
5 is a cross-sectional view taken along the line CC in FIG.
[0024]
6 is a perspective view showing a state where a voice coil is provided in the speaker magnetic
circuit in the first embodiment of the present invention.
[0025]
7 is a cross-sectional view of a speaker using the speaker magnetic circuit in the first
embodiment of the present invention.
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[0026]
8 is a perspective view of a yoke used in the first embodiment of the present invention.
[0027]
9 is a speaker magnetic circuit in the conventional example.
[0028]
Explanation of sign
[0029]
1, 11, 21 yoke 1a bottom surface 1b bent portion 1c protrusion 1d extension portion 2 magnet
A3 magnet B4, 24 pole 5, 15 upper yoke 6 side yoke 7 damper 8 diaphragm 9 voice coil 10, 20,
30 magnetic circuit 22 Magnet g Magnetic gap
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