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DESCRIPTION JPH0555694

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DESCRIPTION JPH0555694
[0001]
BACKGROUND OF THE INVENTION The present invention combines the outer surfaces of two
toroidal radial anisotropic magnets having large and small diameters so as not to be exposed to
the air to form an annular magnetic air gap. The present invention relates to a speaker magnetic
circuit.
[0002]
2. Description of the Related Art A conventional speaker magnetic circuit of this type is disclosed
in Japanese Utility Model Application Laid-Open No. 63-163097 as shown in FIG.
[0003]
Therefore, as shown in FIG. 3 and described with reference to FIGS. 4 and 5, in the conventional
magnetic circuit for a speaker of this type, the yoke (4 ') is used. The surface of the inserted
radially anisotropic rare earth Nd-Fe-B magnets (1a) and (1b) is oxidized because the inner wall
surface and upper surface of the magnetic gap (6 ') are exposed. Since the corner parts are
fragile, they are easily broken, and as a countermeasure for them, the surface must be protected
by applying thin film adhesion processing such as plating.
However, this protective film is preferable because the gap between the magnet and the magnetic
material is increased.
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[0004]
Further, when the magnets (1a) and (1b) are directly opposed to each other to form the magnetic
gap (6 ') as described above, the dimensions of the magnets (1a) and (1b) in the radial direction
When (Δφi, Δφo) is small, a leakage magnetic flux (φι) which is not equal to the main
magnetic flux in the vicinity of the lower end of the air gap is generated in a magnetic body in
close contact, as shown in FIG. Decrease the use efficiency of). As a countermeasure for this, the
radial dimensions (Δφi, Δφo) of the magnets (1a) and (1b) are elongated (flat) so that the
influence of the magnetic pole on the opposite side to the air gap (6 ′) can be ignored. As the
magnetic resistance of the main magnetic path increases, as a result, the number of magnetic flux
(φm) in the main magnetic path decreases, and the magnet in the part far from the magnetic air
gap (6 ′) There is a problem that it does not contribute to the improvement of the magnetic flux
density in) and is wasted, and the use efficiency of the magnets (1a) and (1b) is lowered (see FIG.
4).
[0005]
Therefore, in order to solve the problems of the conventional speaker magnetic circuits (1e), (1f)
and (1g) as shown in FIGS. 3, 4 and 5, the present invention. As shown in FIG. 1, a nonmagnetic
internal cap (5) is used, an annular pole piece (8), (9) is used, and a nonmagnetic upper plate
(10), (11) Not to expose the surfaces of the magnets (6) and (7), and to reduce the difference
(Δφi, Δφo) between the inner and outer diameters of the magnets (6) and (7), thereby
reducing the height. It is an object of the present invention to provide a speaker magnetic circuit
(1) which can be used in a high (cylindrical) manner to eliminate waste of the magnets (6) and
(7).
[0006]
The structure of the present invention for achieving the object will be described with reference to
FIGS. 1 and 2 corresponding to the embodiments. In the magnetic circuit (1), (1 ') constituting 2),
the recess (4a) of the wedge-shaped yoke (4) having the central magnetic pole (3) is formed, and
the magnetic gap (2) is formed at the bottom Insert an annular nonmagnetic internal cap (5)
provided with a spacer (5a), and then form an annular radial anisotropic magnet (6), (7) having
large and small diameters thereon. An inner wall surface (6b) of the yoke (4) and an outer
surface (7b) of the central magnetic pole (3) in such a way as to be in contact with each other,
and an inner wall surface (6b) of the central hole of the magnet (6) And magnetic pole pieces (8)
and (9) respectively in contact with the outer wall surface (7a) of the magnet (7) to form a
magnetic gap (2), and the upper surface is a flat annular nonmagnetic material Structure covered
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with the upper plate (10), (11) It is a speaker magnetic circuit (1).
[0007]
Since the present invention is structured as described above, oxidation is carried out by the
magnetic material covering the inner and outer side surfaces of the magnet and the nonmagnetic
material such as copper, aluminum, resin, etc. covering the upper and lower surfaces. It can
prevent and maintain the impact resistance.
Also, the annular magnetic pole pieces (8) and (9) used on the facing surfaces (magnetic gap
magnetic wall surfaces) of the magnets (6) and (7) reduce the leakage flux, and the difference
between the inner and outer diameters of the magnets (Δφ i , Δφ o) and height can be
increased (in a cylindrical shape), and waste of the magnet can be eliminated.
Further, by providing the annular groove (5b) as shown in FIG. 2, the contact of the voice coil at
the time of large amplitude can be eliminated. That is, since the outer peripheral surface of the
magnet (6) is covered with the outer wall of the yoke (4) and the inner peripheral surface of the
magnet (7) is covered with the central magnetic pole (3), The dimensions of the air gap (2) can be
accurately maintained. As described above, since the lower surfaces of both magnets (6) and (7)
are in contact with the internal gap (5) of the nonmagnetic material, the leakage flux is less likely
to flow, and the dimensions of the magnets (6) and (7) It can be taken high. Furthermore, current
distortion is reduced by using the internal cap (5) and the flat annular top plate (10), (11) as a
non-magnetic conductor such as aluminum or brass to act as a short ring. .
[0008]
Embodiments of the present invention will be described with reference to the drawings. 1 and 2
show an embodiment of the present invention, and FIG. 1 shows an axial half sectional view of
the embodiment of the present invention. In the present invention, in the magnetic circuit (1), (1
') constituting the annular magnetic air gap (2), the recess (4a) of the bowl-like yoke (4) having
the central magnetic pole (3) is formed. An annular nonmagnetic internal cap (5) provided with a
spacer (5a) forming a magnetic air gap (2) is inserted, and an annular radial anisotropy having
large and small diameters thereon The magnets (6) and (7) are combined and fitted to be in
contact with the inner wall surface (6a) of the yoke (4) and the outer surface (7b) of the central
magnetic pole (3), respectively, To form magnetic gaps (2) by providing annular magnetic pole
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pieces (8) and (9) respectively in contact with the inner wall surface (6b) of the central hole and
the outer wall surface (7a) of the magnet (7). It is a speaker magnetic circuit (1) having a
structure in which the upper surface is covered with a flat annular nonmagnetic upper plate (10),
(11).
[0009]
Further, by removing the convex partial spacer (5a) of the internal cap (5) and replacing it with
the annular groove (5b) of the internal cap (15) as shown in FIG. The contact of the voice coil can
be eliminated. That is, since the outer periphery of the magnet (6) is covered with the outer wall
of the yoke (4), if the dimensions of each part are accurate, even if there is no convex partial
spacer (5a) of the internal cap (5) The dimensions can be maintained. As described above, since
the internal cap (5) is a nonmagnetic material, it becomes difficult for the leakage flux to flow,
and the dimensions of the magnets (6) and (7) can be increased accordingly.
[0010]
Although the embodiments considered to be representative of the present invention have been
described above, the present invention is not necessarily limited to only the structure of these
embodiments, and includes the above-mentioned components according to the present invention,
and In order to achieve the purpose of the present invention, the present invention can be
appropriately modified and implemented within the scope having the following effects.
[0011]
As is apparent from the above description, the present invention provides the central magnetic
pole (3) in the magnetic circuit (1), (1 ') constituting the annular magnetic gap (2). Forming a
recess (4a) of the bowl-like yoke (4), and inserting an annular nonmagnetic internal cap (5)
provided with a spacer (5a) forming a magnetic gap (2) at the bottom And an annular radial
anisotropic magnet (6), (7) having large and small diameters thereon, on the inner wall surface
(6a) of the yoke (4) and the outer surface (7b) of the central magnetic pole (3) An annular
magnetic pole piece (8) which is fitted in combination so as to contact with each other and which
respectively abuts on the inner wall surface (6b) of the central hole of the magnet (6) and the
outer wall surface (7a) of the magnet (7); ), (9) to form a magnetic gap (2), and a speaker
magnetic circuit (1) having a structure in which the upper surface is covered with a flat annular
nonmagnetic upper plate (10), (11) It is.
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Since the present invention is a speaker magnetic circuit having the above-mentioned structure,
the magnets (6) and (7) are made of nonmagnetic materials such as copper, aluminum, resin, etc.
Being covered with a magnetic material, oxidation can be prevented and there is no loss due to
impact or the like. Therefore, the magnetic circuit for a speaker according to the present
invention uses the annular magnetic poles for the opposing surfaces (magnetic air gap magnetic
wall surfaces) of the magnets (6) and (7) to reduce the leakage flux and to reduce the inner and
outer diameters of the magnets. The difference (Δφi, Δφo) can be made small and the height
can be made high (in a cylindrical shape), and the waste of the magnet
[0012]
Further, by removing the convex partial spacer (5a) of the internal cap (5) and using an annular
groove (5b) instead as shown in FIG. You can lose it. That is, since the outer periphery of the
magnet (6) is covered with the outer wall of the yoke (4), if the dimensions of each part are
accurate, even if there is no convex partial spacer (5a) of the internal cap (5) The dimensions can
be maintained. As described above, since the internal cap (5) is a nonmagnetic material, it
becomes difficult for the leakage magnetic flux to flow, and the dimensions of the magnets (6)
and (7) should be increased accordingly. Internal cap (5), flat annular top plate By making (10)
and (11) nonmagnetic conductors, current distortion can be reduced by acting as a short ring. It
came to be able to expect the remarkable effect in various practical use etc.
[0013]
Brief description of the drawings
[0014]
1 is a cross-sectional view showing an embodiment of the present invention.
[0015]
2 is a cross-sectional view showing another embodiment of the present invention.
[0016]
3 is a cross-sectional view showing a conventional example.
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[0017]
4 is an explanatory sectional view of a conventional example.
[0018]
5 is another explanatory sectional view of the conventional example.
[0019]
Explanation of sign
[0020]
(1) Magnetic circuit (2) Magnetic air gap (3) Central magnetic pole (4) Wedge-like yoke (4a)
Recess (5) Internal cap (5a) Spacer (6) Radial anisotropic magnet (6a) Center hole outer surface
(7) Radial difference Magnetism (7b) Center hole inner surface (8) Pole piece (9) Pole piece (10)
Top plate (11) Top plate
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