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JPH02268595

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DESCRIPTION JPH02268595
[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. Prior Art A conventional
low-leakage flux speaker of this type has a configuration as shown in FIG. That is, the diaphragm
e is adhered to the peripheral portion of the frame 6 configured by molding the magnetic circuit
4 configured by sandwiching the main magnet 1 with the upper plate 2 and the lower plate 3
with resin, and this diaphragm The voice coil 7 for driving the motor 6 is coupled to the magnetic
gap 9 so that the middle portion thereof is held by the damper 8 so that the center portion is
held by the damper 8. A dust cap 1Q made of a non-magnetic material such as cloth, resin film,
or aluminum is adhered to form a speaker body. Furthermore, the back surface portion of the
lower plate 3 is configured by the cancel magnet 11 magnetized in the opposite direction to the
main magnet 1 and the shield cover 12 covering the entire magnetic circuit. The problem to be
solved by the invention However, the conventional low-leakage-flux-type SVEE force of this type
reduces the leakage flux from the magnetic circuit 4 by the effect of the cancel magnet 11 and
the shield cover 12. For video equipment that has a very high level of requirement for the
leakage flux, there is a problem that even if the leakage measures are taken as described above, it
may not be usable. The present invention solves such conventional problems, and provides a lowleakage flux type speaker having very excellent performance against a leakage flux. Means for
Solving the Problems In order to solve the above problems, the present invention is to reduce the
leakage flux generated from the center ball of the lower plate, which usually has a large amount
of leakage flux, to the front surface of the speaker. A body consisting of a body, a magnetic metal
body covered with paper, resin, etc., and a material obtained by mixing magnetic material powder
into paper, a dust cap itself having a magnetic shielding effect and a speaker from the center ball
of the lower plate It is configured to absorb the leakage flux in the front direction. In addition to
the magnetic shielding effect of the conventional cancel magnet and the shield cover, the above
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configuration also makes the dust from the magnetic metal body against the magnetic leakage
toward the front of the speaker generated from the center ball of the lower plate. It is
magnetically shielded by a cap, a dust cap made of a composite of magnetic metal and paper,
resin or the like, or a dust cap in which magnetic material powder is mixed with paper, and the
leakage flux to the outside is greatly reduced.
EXAMPLE Hereinafter, a low leakage magnetic flux type speaker according to an example of the
present invention will be described with reference to the drawings. As shown in FIG. 1, a
diaphragm 26 is formed on a peripheral portion of a frame 25 which is formed by integrally
molding a magnetic circuit 24 formed by sandwiching the main magnet 21 by an upper plate 22
and a lower plate 23 by resin. The voice coil 27 for driving the vibration plate 26 is center-held
by the damper 28 at its middle part and coupled so as to fit in the magnetic gap 29, and iron or
other magnetic material is attached to the surface of the vibration plate 26. A dust cap 30 made
of a metal body is adhered to form a speaker main body, and a cancel magnet 31 magnetized in
the reverse direction to the main magnet 21 on the back surface of the lower plate 23 and a
shield covering the entire magnetic circuit The cover 32 is formed. Here, with regard to the dust
cap 3o, in addition to the embodiment shown in FIG. 1, a dust cap in the form of a composite
with paper or a composite with resin as shown in FIG. As another example, as shown in FIG. 3,
the sound pressure level of the speaker caused by the increase in the weight of the dust cap can
be prevented as shown in FIG. It may be configured as a dust cap 34 in which magnetic material
powder such as iron powder is mixed. By doing this, magnetic leakage in the front direction of
the speaker, which normally occurs from the center ball of the lower plate 23 where there is a
large amount of magnetic leakage, is also magnetically shielded by the dust cap 30, 33. 34 in the
above embodiment. Leakage flux to the housing is greatly reduced. As described above,
according to the present invention, in addition to the magnetic shielding effect by the
conventional cancel magnet and shield cover, a dust cap made of a magnetic metal body, a dust
cap made of a composite of a magnetic metal body and paper or resin, paper The magnetic shield
is also magnetically shielded by the dust cap mixed with the magnetic material powder, so that it
is possible to provide an unprecedented ultra-low magnetic leakage speaker, and its industrial
value is extremely large.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a cross-sectional view of a loudspeaker according to an embodiment of the present
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invention, FIGS. 2 and 3 are cross-sectional views of a loudspeaker according to another
embodiment of the present invention, and FIG. 4 is a cross-sectional view of a conventional
loudspeaker.
21 · · · · · Main magnet, 22 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · ...... Cap 31, 31 Cancel magnet 32, Shield cover 33 Dust cap made of composite of magnetic
metal and paper or resin 34・ Dust cap mixed with magnetic material powder. Name of agent
Attorney Attorney Shigetaka Takano and one other person Figure 2
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