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JPH02295398

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DESCRIPTION JPH02295398
[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 frame 3 is
adhered to the magnetic circuit 4 configured by sandwiching the main magnet 1 by the upper
plate 2 and the lower plate 3, the diaphragm 6 is adhered to the peripheral portion of the frame
5, and the diaphragm 6 is driven The voice coil 7 for centering is held by the damper 8 at the
center, coupled so as to fit in the magnetic gap 9, and the dust cap 1o is adhered to the surface of
the connecting portion of the diaphragm 6 with the voice coil 7 It was configured as.
Furthermore, the back cover of the lower plate 3 incorporates a cancel cover 11 magnetized in
the opposite direction to the main magnet 1 and a shield cover 12 that covers the side and back
of these magnetic circuits 4 in a single layer. It was SUMMARY OF THE INVENTION However, the
conventional low-leakage flux type speaker of this type has a leakage flux from the magnetic
circuit 4 due to the effect of the shield cover 12 which covers the cancel magnet 11 1 in a single
layer. However, for video equipment where the level of demand for this leakage flux is extremely
strict, it may be affected by a very small amount of leakage flux generated through the shield
cover 12 and it may not be usable. It had a problem that there was a problem. The present
invention solves such conventional problems and provides a low-leakage-flux-type sbi ker having
very excellent performance against leakage flux. Means for Solving the Problems In order to
solve the above problems, the present invention provides a shield cover having a structure in
which a shield circuit which shields a magnetic circuit consisting of a main magnet and upper
and lower plates and a cancel magnet is more than doubled. Is used to reduce the leakage flux. In
the above configuration, the magnetic circuit and the shield cover that shields the cancel
magnetot are shielded more than twice, so compared with the conventional single-layer shield,
the single-layer shield can not be shielded as well as the outside. The magnetic flux that has
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leaked is interrupted by the second and subsequent shields, and the magnetic flux leakage to the
outside of the shield cover 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, the frame 24 is adhered to the magnetic circuit 26
configured by sandwiching the main magnet 21 by the upper plate 22 and the lower plate 23,
and the diaphragm 26 is adhered to the periphery of the frame 240. The voice coil 27 for driving
the plate 26 is held by the damper 28 at the center, coupled to the magnetic gap 29 so as to be
fitted into it, and the dust cap 30 is bonded to the surface of the connecting portion of the
diaphragm 26 with the voice coil 27. Further, the back surface of the lower plate 23 has a shape
capable of double shielding the side surfaces of the cancel magnet 31 magnetized in the direction
opposite to the main magnet 21 and these magnetic circuits 25. And a shield cover 32 obtained
by processing a magnetic metal body such as an iron plate.
Here, with regard to the shield cover 32, in addition to the embodiment shown in FIG. 1, as
shown in FIG. 2, in order to strongly block the leakage flux generated in the direction of the back
surface of the magnetic circuit 25 By extending the one end face portion, the leakage flux can be
effectively reduced. Further, as another embodiment, as shown in FIG. 3, the leakage magnetic
flux can be further reduced by processing the side portion of the magnetic circuit 26 into a shape
that can be shielded in a triple manner. Further, in this case, as in the embodiment shown in FIG.
3, the end face portion of the shield force bar is extended in the direction of the frame 24 so that
the leakage flux generated from the vicinity of the frame 24 can also be absorbed. Can be
significantly reduced. Effect of the Invention As described above, the present invention does not
shield the side portion of the magnetic circuit in a single layer as in the prior art but provides a
shield cover with a structure capable of shielding more than double, and shields if necessary. The
cover is extended to the back of the magnetic circuit and further to the side of the frame, so that
the magnetic flux and the leakage flux generated from the frame are cut off by this shield cover
to the outside of the speaker. It is possible to provide a low-leakage flux type speaker with
significantly reduced leakage flux, and its industrial value is extremely large.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a cross-sectional view of a low leakage flux speaker according to an embodiment of the
present invention, FIGS. 2 and 3 are cross sections of a low leakage flux speaker according to
another embodiment of the present invention, and FIG. Is a cross-sectional view of the low
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leakage flux speaker.
21 · · · · · Main magnet, 22 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · magnetic circuit,
26 ...... ...... cancel magnet, 32 ...... shield cover 0 attorney's name Attorney millet field heavy
Takashi and one other person first Figure the Figure the Figure
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