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DESCRIPTION JPS54179734

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DESCRIPTION JPS54179734
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing a conventional
speaker box. FIG. 2 is a sectional view showing one embodiment of the speaker box of the
present invention, and FIG. 3 is a sectional view of a main part of a box main body showing
another embodiment. 5 · · · · · · · box body, 6 · · · · · magnetic circuit, 7 · · · · · speaker, 8 · · · · ·
ferromagnetic plate-9 · · · · punching metal Plate, 11 · · · ferromagnetic milk powder
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speaker box
having a built-in speaker, and it is intended to provide a speaker box with remarkably reduced
leakage magnetic flux from a magnetic circuit of a speaker. 0 As a recent stereo reproduction
apparatus, The shelf shape is being developed as effective from the housing situation in Japan.
Such a speaker as a stereo reproducing apparatus ~ 5 "'' is also 5-digit '' and it has been
miniaturized from 7 1 Speaker box Toshi grinding like this small t7'73 ¥ 2 , As shown in FIG. 1, a
speaker 3 having a magnetic circuit 2 is incorporated in a box main body 1 made of a nonmagnetic material such as wood or a turquoist, and a sound absorbing material 4 such as a class
wool is stored in a box salary 1 It is made of barrels. As this speaker box with a sturdy
configuration, the magnetic circuit 2 having a strong magnetic force is close to the outer
enclosure wall of the box body 1, and a considerable amount of leakage magnetic flux leaks out
of the box body 1 0 When placing the speaker box close to the color television receiver or
placing the speaker box close to the amplifier or the tee of the stereo reproducing apparatus, it is
possible to obtain a beautiful image with a large amount of leakage magnetic flux, There was a
disadvantage that it loses or has a disadvantage that a tunnel coil (a beggar, a shadow% is given
and a large miscellaneous stone is added to the reproduced sound) 0 This idea is to eliminate the
conventional absence like the above. Below, an embodiment of the inconvenient idea is shown in
FIG. In Figure 2, 5 is a box main body constituted by wood or die casting, and in front of this box
main body 5, a magnetic circuit 6 And a speaker 7 having a plurality of speakers. Moreover, a
ferromagnetic plate 8 such as an iron plate is attached to the outer periphery of the box main
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body 5. Then, a punching metal lid 9 made of a ferromagnetic material such as an iron plate is
attached to the front of the speaker completion. Inside the box body 5, a sound absorbing
material 1 o such as a class wool is stored. With such a configuration, no matter how small the
box main body 6 is and the magnetic 1st path 6 of the speaker 7 is brought close to it, the large
leaked magnetic flux from the magnetic circuit 6 can be absorbed by the ferromagnetic material
plate 8 and the punching metal Phase 9 can significantly reduce the leakage flux from the
shielded shims and spin box. In addition, as for other '施 施 l + 11', as shown in Fig. 3, the box
main body and so on (counting number of fermented powders 11 mixed into phase of grease
etc.), 6 self You can also have a shield effect on your salary.
P :) ·, ', - I / 4 Since the speaker box of the present invention is constructed as described above,
the leakage magnetic flux of the speaker's magnetic circuit is reliably shielded regardless of how
small the speaker box is miniaturized It can be reduced to less than 0.5 cousins. You can connect
this speaker box to a television receiver or a 3, □ 77, or 77, or f ,, - +, L, A 7 ← [1, . 4えあヶい、
え。 It can be made safe, it can be made safe, it has a great practical value.
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