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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker magnetic shield for reducing the leakage flux of a speaker. The configuration of the prior
art and its problems In recent years, the audio industry has merged with visual devices. Are
moving to the age of so-called AV, and even if installed on the side of a television, there are many
commercially available speaker systems with magnetic shielding devices that do not cause color
shifts in the television screen, etc. The offer of is awaited. The following describes a conventional
magnetic shield apparatus for a speaker. . FIG. 1 is a cross-sectional view of a general
loudspeaker not provided with a magnetic shield. 1 is a bottom plate, 2 is a magnet bonded
thereon, 3 is a top plate bonded onto the magnet 2, 4 is a magnetic circuit composed of the
above three components, 5 is a frame fixed to the top plate 3, 6 is a gasket, 7 is an edge with one
end adhered to the frame 5, 8 is a diaphragm supported by the edge 7, 9 is a voice coil, 1o is a
damper supporting the voice coil, 11 is a central portion of the diaphragm 8 Is a dust cap
attached to In the general Sveica configured as described above, since the magnetic circuit 4 has
a so-called external magnet type configuration, the leakage flux 1 between the top plate 3 and
the bottom plate 1 can not be avoided. The TV screen will be adversely affected not a little. FIG. 2
is a cross-sectional view of a speaker having a conventional magnetic shield device. The same
parts as those in FIG. 14 is a cancel magnet magnetized in the opposite direction to the magnet 2,
15 is a magnetic shielding cover whose inner bottom is in close contact with the cancel magnet
14, 12 is a top plate fitted with the end of the magnetic shielding cover, 13 is a magnetic circuit
0 The operation of the above-described speaker magnetic shield apparatus will be described. The
magnetic circuit of the external magnet type is basically the same as that shown in FIG. 1, but the
cancellation magnet 14 offsets the leakage magnetic flux and a slight residual magnetic flux
flows to the magnetic shielding cover 15 Therefore, the outside of the magnetic shielding cover
15 is configured so as not to generate a leakage flux that may affect the television screen 0
However, in the above configuration, the expensive cancel magnet 14 and the top plate 1 with a
large diameter Not only is it necessary to add or change the three components of the shield 12
and the magnetic shielding cover 13 but it is not only expensive but also the general speaker
shown in FIG. 1 and the speaker shown in FIG. Since it is a separate speaker, it has the problem
that it becomes extremely inefficient because it is treated as another model both in production
and management. It had.
SUMMARY OF THE INVENTION It is an object of the present invention to solve the abovedescribed conventional problems, and to provide a very efficient speaker shield apparatus at a
low cost. The present invention is a magnetic shield apparatus for a speaker which biases a
speaker having a magnetic circuit and a back chamber configured by a magnetic body whose
opening end is in close contact with the frame of the speaker, and is configured by a magnetic
body. The chamber prevents leakage magnetic flux from the speaker from leaking to the outside,
so that the influence on the television screen can be eliminated, and this back chamber creates a
so-called back cavity (closed space) behind the speaker. It is also a thing. Description of the
embodiment Fig. 3 shows a cross-sectional view of a magnetic shield for a loudspeaker in an
embodiment of the present invention. The explanation of the speaker is omitted because it has
the same configuration as that of FIG. 16 is a back chamber whose internal volume is set so as to
prevent internal pressure interference with other speakers and to obtain a desired frequency
characteristic. Note that this back chamber 16 is usually used for the midrange of a 3-way
speaker system. It is possible to prevent internal pressure interference with other speakers by
creating a so-called pack capacitance behind the speakers. In this embodiment, the operation of
the back chamber 16 will be described with respect to the present embodiment configured as O
or more configured of magnetic material. Also in this embodiment, magnetic flux leaks from the
magnetic circuit 4 as in the conventional speaker shown in FIG. 1, but the magnetic flux is
generated by providing the back chamber 16. It flows through the chamber 16. For this reason,
the leakage flux outside the back chamber 16 becomes extremely small according to the present
embodiment, as in the case of 0 or more, the back chamber 16 for making the back cavity is
made of a magnetic material, and the conventional general Even the speaker can reduce its
leakage magnetic flux, and the effect of the invention can be realized extremely inexpensively to
realize the magnetic shield device of the speaker extremely inexpensive 0 effect of the present
invention The present invention is a back around the speaker having a magnetic circuit Since the
chamber is provided and the back chamber is made of a magnetic material, the leakage flux from
the speaker can be easily reduced, and even if the speaker is installed adjacent to the television,
the color shift color unevenness on the screen Considering a speaker with 0 or back chamber
that can eliminate the influence of The back chamber can be made of magnetic material such as
iron, so the magnetic shield can be realized without much cost increase. 0 The speakers
themselves also produce a large number of identical speakers regardless of the presence or
absence of the magnetic shield. As a result, it is possible to realize an excellent magnetic shield
apparatus for a speaker that can be easily managed without loss of production switching.
Brief description of the drawings
FIG. 1 is a cross-sectional view of a general speaker, FIG. 2 is a cross-sectional view of a
conventional magnetic shield apparatus for a speaker, and FIG. 3 is a cross-sectional view of the
magnetic shield apparatus for a speaker in an embodiment of the present invention.
1 · · · Bottom plate, 2 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Leakage magnetic
velocity. Name of agent Attorney Nakao Toshio Other 1 person Figure 1
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