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JPH0530593

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DESCRIPTION JPH0530593
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker used in various audio equipment and video equipment.
[0002]
2. Description of the Related Art A conventional speaker will be described below with reference
to the drawings. FIG. 2 is a cross-sectional view showing the configuration of a conventional
speaker, in which a magnetic circuit 5 configured by sandwiching the main magnet 1 by the
upper plate 2 and the lower plate 3 having a center pole is integrally formed with the plume 4
and molded by resin. The voice coil 7 is fixed to the periphery of the frame 4 and fixed to the
periphery of the diaphragm 8. The voice coil 7 is fitted into the magnetic gap 9 formed in the
magnetic circuit 5, and the voice coil 7 is formed. The inner periphery of the damper 6 whose
peripheral edge is connected to the frame 4 is coupled to the middle part of the coil 7 and
supported, and the dust cap 10 is fixed so as to cover the joint of the diaphragm 8 and the voice
coil 7 It was configured.
[0003]
Furthermore, the auxiliary magnet 11 magnetized in the direction opposite to the main magnet 1
is coupled to the lower surface of the lower plate 3, and the shield cover 12 formed to cover the
entire magnetic circuit 5 is coupled to leak the magnetic circuit 5. To prevent as much of the
magnetic flux as possible.
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1
[0004]
However, in the above-described conventional configuration, the magnetic flux leaking to the
lower surface and the side surface of the magnetic circuit 5 can be reduced by the effect of the
auxiliary magnet 11 and the shield cover 12, but the center of the lower plate 3 The magnetic
flux leaks from the pole to the upper surface of the magnetic circuit 5, that is, the magnetic flux
leaking from the entire surface of the speaker, can not be blocked.
For this reason, in the image field where the leakage flux is very severe, there is a problem that
the leakage flux to the front of the speaker sometimes makes it unusable.
[0005]
An object of the present invention is to solve such conventional problems and to provide a
speaker with extremely small leakage flux.
[0006]
SUMMARY OF THE INVENTION In order to solve the above problems, the loudspeaker according
to the present invention has a main circuit integrally formed with a magnetic circuit in which a
magnetic gap is formed by sandwiching a main magnet with an upper plate and a lower plate
having an auxiliary magnet coupled to the lower surface. A voice coil formed by winding a coil
around a bobbin made of paper or resin containing magnetic metal powder or magnetic material
powder is joined to the resin frame molded in the above, and the peripheral portion of the
diaphragm coupled to the central portion is joined to the voice coil. And a shield cover formed so
as to cover the magnetic circuit at the bottom of the frame.
[0007]
With this configuration, in addition to the magnetic shielding effect by the auxiliary magnet and
the shield cover, the leakage flux toward the front of the speaker generated from the center pole
of the lower plate is magnetically shielded by the bobbin of the voice coil made of magnetic
metal. Therefore, the leakage flux can be significantly reduced.
[0008]
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2
DESCRIPTION OF THE PREFERRED EMBODIMENT A loudspeaker according to an embodiment of
the present invention will be described below with reference to the drawings.
The same reference numerals are given to parts having the same configuration as the
conventional example.
[0009]
FIG. 1 is a cross-sectional view showing the configuration of a loudspeaker according to the
present invention, in which a magnetic circuit 5 configured by sandwiching a main magnet 1 by
an upper plate 2 and a lower plate 3 having a center pole is integrated with a frame 4 and made
of resin. It is molded.
[0010]
A peripheral portion of diaphragm 8 in which a voice coil 14 formed by winding a coil is wound
around a bobbin 13 made of paper or resin containing magnetic metal powder or the like is fixed
to the peripheral portion of this frame 4 Further, the voice coil 14 is inserted into the magnetic
gap 9 formed in the magnetic circuit 5, and the inner periphery of the damper 6 whose
peripheral portion is coupled to the frame 4 is coupled to and supported by the middle portion of
the voice coil 14 The dust cap 10 is fixed so as to cover the joint between the plate 8 and the
voice coil 14.
[0011]
Furthermore, the auxiliary magnet 11 magnetized in the direction opposite to the main magnet 1
is coupled to the lower surface of the lower plate 3, and the shield cover 12 formed to cover the
entire magnetic circuit 5 is coupled to leak the magnetic circuit 5. To prevent as much of the
magnetic flux as possible.
[0012]
Since the voice coil 14 comprises the bobbin 13 wound with a coil made of paper, resin or the
like containing magnetic metal or powder of magnetic material powder, the direction from the
upper surface of the center pole of the lower plate 3 of the magnetic circuit 5 to the front of the
speaker The magnetic flux leaking to the lower side is focused by the bobbin 13 and efficiently
induced to the upper plate 2 to form the magnetic circuit 5.
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[0013]
As a result, the bobbin 13 magnetically shields the magnetic flux leaking from the top surface of
the center pole toward the front of the speaker, and the leakage flux can be reduced by about 20
to 30% as compared with the conventional product.
[0014]
The material used for the bobbin 13 may be, for example, a magnetic metal formed by molding
an iron plate or the like in addition to the paper or resin containing the magnetic material
powder.
However, when a conductive material is used as the material of the bobbin 13, it is necessary to
wind a coil on the surface of the bobbin 13 via an insulator.
[0015]
As described above, the speaker according to the present invention uses the voice coil using the
bobbin having the magnetic shielding effect as well as blocking the magnetic flux leaking to the
lower surface and the side surface of the magnetic circuit by the auxiliary magnet and the shield
cover. The magnetic flux leaking from the center pole toward the front of the speaker can be
reduced, and the magnetic flux leaking to the outside can be totally reduced.
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