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JPH02268597

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DESCRIPTION JPH02268597
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
low-leakage flux type speaker used for various audio and visual devices. 2. Related Art A low
leakage magnetic flux type speaker of this type has conventionally been configured as shown in
FIG. That is, the diaphragm 6 is bonded to the peripheral portion of the frame 60 configured by
integrally molding the magnetic circuit 4 configured by sandwiching the main magnet 1 by the
upper plate 2 and the lower plate 3 and molding the resin. The voice coil 7 for driving the plate 6
is center-held by the damper 8 with its middle part held by the damper 8 so as to be fitted into
the magnetic gap 9, and dust is applied to the surface of the joint of the diaphragm 6 with the
voice coil 7 The cap 10 is bonded to form a speaker body. Furthermore, the back surface of the
lower plate 3 is composed of the cancel magnet 11 magnetized in the direction opposite to the
main magnet 1 and the shield cover 12 covering the side surface and the back surface of the
magnetic circuit 4. SUMMARY OF THE INVENTION However, in the conventional loudspeaker of
this type, the leakage flux from the magnetic circuit 4 is reduced by the effect of the cancel
magnet 11 and the shield cover 12. Depending on the shape, the side and back parts of the
magnetic circuit 4 of the speaker are effective, but on the front part of the speaker, some leakage
flux is generated because there are no components for shielding the leakage flux, It has a
problem that it can not be used for video equipment with very strict requirements. The present
invention solves such conventional problems, and provides a low leakage flux speaker having
very excellent performance against leakage flux. Means for Solving the Problems In order to
solve the above problems, the present invention is directed to a leakage flux shield comprising a
magnetic metal body in the front direction of the upper plate, ie, in the direction opposite to the
main magnet when molding the magnetic circuit integrally. At the same time, the plate is molded
at a distance from the top plate, thereby shielding the leakage flux toward the front of the
speaker, which usually has a very large amount of leakage flux, and reducing the leakage flux to
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the outside. With the above configuration, in addition to the magnetic shielding effect on the side
and back of the speaker magnetic circuit by the conventional cancel magnet and shield cover, the
leakage flux to the front is also on the front of the upper plate. It is magnetically shielded by the
arranged plate made of a magnetic metal body, and the leakage flux to the outside is greatly
reduced.
Embodiment A low leakage flux speaker according to an embodiment of the present invention
will be described with reference to the drawings. As shown in FIG. 1, a magnetic circuit 24
configured by sandwiching the main magnet 21 by the upper plate 22 and the lower plate 23
and a leakage flux generated from the magnetic circuit 24 are shielded to shield leakage toward
the front of the speaker The magnetic flux generated from the main magnet 21 directly from the
main magnet 21 through the upper plate 22 in the front direction of the upper plate 22, that is,
the opposite direction of the main magnet 21, for the shield plate 33 A distance is provided with
the upper plate 22 so as not to be transmitted to the plate 33, and the frame 25 is configured by
integral molding with resin. A diaphragm 26 is bonded to the peripheral edge of the frame 26,
and a voice coil 27 for driving the diaphragm 26 is center-held by a damper 28 at its middle
portion and coupled so as to fit in the magnetic gap 29. A dust camp 30 is adhered to the surface
of the diaphragm 2? coupled to the voice coil 2R to form a speaker body, and a cancel magnet
magnetized in the reverse direction of the main magnet 21 on the back surface of the lower plate
23 31 and a shield cover 32 which covers the side and back portions of the magnetic circuit 24.
By doing this, there is usually no component to be shielded, and therefore, for shielding made of
a magnetic metal body disposed at a distance on the front surface of the upper plate 22 even in
the front direction of the speaker where a large amount of leakage flux is generated. It is
magnetically shielded by the plate 33, and the leakage flux toward the front of the speaker is
significantly reduced. As described above, according to the present invention, in addition to the
magnetic shielding effect to the side direction and the back direction of the speaker magnetic
circuit by the conventional cancel magnet and shield cover, the distance to the top plate in the
front direction is provided. It is also possible to implement magnetic shielding in the front
direction of the magnetic circuit of the speaker by means of a shielding plate made of magnetic
metal placed in one side, so it is possible to provide an unprecedented ultra low leakage flux type
speaker, and its industrial value is extremely high. Become a dog.
[0002]
Brief description of the drawings
[0003]
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FIG. 1 is a cross-sectional view of a low leakage magnetic flux speaker according to an
embodiment of the present invention, and FIG. 2 is a cross-sectional view of a conventional low
leakage magnetic flux speaker.
21 ░░ и и и Main magnet, 22 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и magnetic circuit, 25 и и и и и
и и и и 26 ..... и и и Cancel magnet% 32 иии и и и Shield cover 33 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и shield
cover 33 и и и и и и и и plate for shield. Name of agent Attorney Attorney Shigeru Takano and 1 more
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