JPS57122994

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DESCRIPTION JPS57122994
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partial sectional front view showing a
conventional Spinica, FIGS. 2 to 4 are front views showing an embodiment of a speaker according
to the present invention, and FIGS. It is a partially sectioned front view of other examples. 8 ......
magnetic circuit, 12 ······ frame, 13 ...... nonmagnetic, 14 ...... cancel magnet.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speaker having
a canceling magnetic flux attached to a magnetic circuit through a nonmagnetic material to make
a low leakage magnetic flux. A conventional speaker of this type is constructed as shown in FIG.
That is, the frame 5 is coupled to the magnetic circuit 4 constituted by the plate 1, the magnet 2
made of ferrite or the like, and the upper press 3), and the diaphragm 5, voice coni, / 12 shoulder
06 ° 2 The magnetic sensor 4 is assembled and coupled to the shield cover 6 t so as to cover
the magnetic circuit 4, and the cancel magnet 7 is attached to the inner bottom surface of the
shield cover 6. In this configuration, since a ferromagnetic material is used as the shield cover 6,
a large amount of magnetic flux passes through the shield cover 6, and thus the magnet 2 of the
magnetic circuit 4 and the cancel magnet 7 also have a low deviation from one another. However,
both can not be used at appropriate operating points, and there is a disadvantage that the cost is
high in terms of materials and production because the shield cover 6 is used. Furthermore, when
the magnet 2 of the magnetic circuit 4 and the cancel magnet are composed of ferrite magnets,
the use of the shield cover 6 lowers the operating point of the magnets 2 and 7, resulting in a
low temperature demagnetization. The present invention eliminates the above-mentioned
conventional drawbacks. D. Embodiments of the present invention will be described with
reference to FIGS. In FIG. 2, reference numeral 8 denotes a magnetic circuit, and the magnetic
circuit 8 is an external magnet type, and is constituted by a plate 9 with a center pole, a ringshaped magnet 10, and a ring-shaped upper plate 11 as well. . A frame 12 is coupled to the
magnetic circuit 8, and a vibration system component such as a diaphragm and a voice coil is
incorporated in the frame 12. Furthermore, a cancel magnet 14 is attached to the bottom of the
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magnetic circuit 8 through a nonmagnetic material 13 such as a synthetic resin having a
thickness of 0.2 pus or more. Further, the embodiment shown in FIGS. 3 and 4 uses an internal
magnet type magnetic circuit as the magnetic circuit 8, and FIG. 3 shows that a prismatic magnet
16 is incorporated in a square yoke 15, Fig. 4 shows a configuration in which a columnar magnet
or a laminate of a columnar magnet and an upper plate is incorporated in a wedge-shaped yoke
1, and in this embodiment also a nonmagnetic material having a thickness of 0.21 + 1 m or more
on the bottom of the magnetic circuit A cancellation magnet 14 ° 0) is attached and configured
via 13.
10G ′; □ Furthermore, the configuration shown in FIGS. 6 and 6 has a configuration in which
the magnetic circuit 8 of the external magnet type or the internal magnet type is molded with the
synthetic resin 18. The cancel magnet 14 is disposed at an interval of 2 m + n or more and −H,
and the nonmagnetic synthetic resin 8 is interposed between the magnetic circuit 8 and the
cancel magnet 14. In each of the above-described embodiments, the magnet 10.16 of the
magnetic circuit 8 and the cancel magnet 14 are magnetized in the opposite direction. The
reason why the thickness io, 2 + ++ m or more of the nonmagnetic material 13 is 0.2 m + n or
less is other than the original purpose of passing through the nonmagnetic material 13 and
acting by the magnetic forces of both magnets to cancel leakage flux. This is to cancel out the
mutual magnetic force. As described above, since the speaker according to the present invention
is disposed on the bottom of the magnetic circuit via a nonmagnetic material with a thickness of
0.2 mm or more via a nonmagnetic material, the leakage flux from the magnetic circuit is
canceled by the cancellation photodiode. ) It can be used with less leakage flux and can be used
in television receivers that are susceptible to adverse effects by leakage flux 068. Furthermore,
the magnet that composes the magnetic circuit and the canceling magnet operate at an
appropriate operating point with a predetermined permeance. And the efficiency as a speaker
can be made high, and it is a thing of great practical value.
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