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FIELD OF THE INVENTION The present invention relates to a composite speaker having a
plurality of magnetic circuits. The structure of the prior art and its problems As shown in FIG. 1,
the conventional speaker has a structure in which independent magnetic circuits are arranged at
predetermined intervals for each speaker unit. In FIG. 1, 1 is a magnetic circuit for a tweeter, 2 is
a magnetic circuit for a woofer, and 3 is a skive length interposed between the two magnetic
circuits. Further, in the magnetic circuit 1 for a towter, 11 is a magnet, 12 is a magnetic circuit
upper plate for a towter, and 13 is a magnetic circuit bottom plate for a towter. Further, in the
woofer magnetic 1 'path 2, 21 is a magnet, 22 is a woofer magnetic circuit bottom plate, and 23
is a woofer magnetic circuit upper plate. As described above, the conventional speaker has a
disadvantage that the configuration becomes complicated because the magnetic circuit is
configured independently for each speaker unit. SUMMARY OF THE INVENTION The object of
the present invention is to simplify the 47M configuration in the above-mentioned composite
type speaker and to further improve the magnetic flux density. The present invention integrates
the bottom of the conventional tweeter magnetic circuit and the upper plate of the woofer
magnetic circuit, and arranges the magnets so that the mutually opposing magnetic poles have
the same polarity. It will be achieved. DESCRIPTION OF THE PREFERRED EMBODIMENT The
present invention 6-embodiment will be described with reference to FIG. The same items as in
FIG. 1 will be described with the same reference numerals. In FIG. 2, the plate in which the
bottom plate of the magnetic circuit for tweeter and the upper plate of one for the magnetic
circuit for c are integrated is created by eliminating the spacer in FIG. The magnetic poles facing
J1? of the magnet 11.21 are arranged to have the same polarity. By this configuration, not only
the configuration is simplified but also the magnetic flux density of each magnetic gap is
increased compared to the prior art. The dimensions of the woofer magnet 21 are ?166 О ?80
О t20. When the size of the tweeter magnet is ?110 О ?60 О t15, the magnetic gap magnetic
flux density of the woofer is 7030 gauss, and the magnetic gap magnetic flux density of the
tweeter is 11500 gauss in the structure of the conventional example. When the plate is
integrated as shown in FIG. 2 with this conventional magnetic pole, the woofer becomes 6430
gauss and the toeter becomes 10000 gauss, both of which decrease the magnetic flux density.
However, as shown in Fig. 2, by arranging the mutually opposing magnetic poles of the magnets
to have the same polarity, the magnetic density of the woofer is 7280 gauss, and the magnetic
flux density of the towter is 12050 gauss. Both magnetic flux densities increased. .
As described in detail in the invention, the present invention not only simplifies the construction
but also has the effect of increasing the magnetic flux density, the value of which is extremely
dog friendly.
Brief description of the drawings
FIG. 1 is a cross-sectional view of a loudspeaker according to a conventional example, and FIG. 2
is a cross-sectional view of the loudspeaker according to an embodiment of the present invention.
1 ииииии Magnetic circuit for tweeter, 2 иии иии Magnetic circuit for woo / и и и и и и и и и и и и и и и и и и и и и и и и и и и
и и и и и и и и и и и и и и и и и и ... Magnetic circuit upper Great for tweeter, 22 ..... For Uno (illl air bottom
plate. Name of Agent Attorney Nakao Toshio and 1 other person Figure 1 Figure 2
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