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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a magnetic circuit
portion of a conventional speaker, and FIG. 2 is a cross-sectional view of an embodiment of the
present invention. Description of symbols of major parts, 1 Magnetic circuit for tweeter, 2
Magnetic circuit for woofer, 13.21 Magnet.
The present invention relates to a loudspeaker, in particular to a so-called two-way coaxial
loudspeaker in which two sets of magnetic circuits are arranged coaxially. 3, in the loudspeaker,
for woofer and towmee There is a so-called composite speaker in which respective magnetic
circuits are coaxially arranged in multiple stages to form a so-called composite speaker, which is
called a two-way coaxial speaker. In such a speaker, the magnetic flux distribution in each
magnetic gap − ′ ′ // p 2/2 mutually affect each other to cause a decrease in magnetic flux
density, resulting in a decrease in the speaker sensitivity. Accordingly, it is an object of the
present invention to provide a composite speaker in which the mutual influence of the magnetic
circuit in such a coaxial speaker is eliminated and the magnetic gap magnetic flux density is
further increased to improve the sensitivity. The speaker according to the present invention is a
speaker in which a plurality of magnetic circuits each having a magnetic gap in which a voice coil
is inserted is laminated with a predetermined interval, and the opposing magnetic poles of
magnets of adjacent magnetic circuits have the same polarity. It is characterized in that the
arrangement is made to increase the magnetic flux density in each other's magnetic gap. The
present invention will be described below with reference to the drawings. FIG. 1 shows the crosssectional structure of the magnetic circuit portion of a conventional two-way coaxial speaker. The
reference numerals 3- and 1 denote a magnetic circuit for a towter, 2 denotes a magnetic circuit
for a woofer, and 11 denotes a pole yoke for a tweeter. A lower yoke plate 12 is provided on the
outer peripheral surface of the lower end of the yoke so as to protrude, and an annular magnet
13 is mounted on the plate 12 and an annular upper surface of the magnet 13 is formed. The
upper yoke plate 14 is fixed to form an outer peripheral surface of one end of the pole yoke 11
and the magnetic cap 15, and a voice coil for Tweak is inserted in the gap 15 to form a so-called
external magnetic type magnetic circuit 5 The magnetization state of the magnet 13 is, for
example, N pole at the top and S pole at the bottom. The woo-magnetic circuit 2 has an annular
magnet 21 and an upper upper yoke plate 22 of the same annular shape is attached to the upper
surface of the magnet, and an annular lower yoke plate 21 is attached to the lower surface. There
is. The t-side yoke plate Z3 is formed in a substantially U-shaped cross section at its outer
peripheral end to form a magnetic gear tab with the outer peripheral edge of the upper yoke
plate n. A voice coil is inserted to form a so-called inner magnet type magnetic circuit
configuration. When the magnet 21 is IFII, the upper surface is N pole and the lower surface is S
9) The two magnetic circuits 1 and 2 are configured in multiple stages so that the central axes of
the annular magnets 13 and 21 are coaxial with each other by the support member 16. . In such
a configuration, the opposing magnetic poles of the magnets 13 and 21 are of opposite polarity,
so that the magnetic fluxes mix and affect each other between the magnetic circuits 1 and 2 to
generate the magnetic flux density in the magnetic gap. It results in a reduction. . Accordingly, in
the present invention, the structure is as shown in FIG. 2, and FIG. 2 reduces the cross-sectional
structure of the magnetic circuits 1 and 2. The same parts as in FIG. It is done. Also in this
example, the magnetic circuit 1 for tweeter is an external magnet type structure, the magnetic
circuit 2 for woo .. is an internal magnetic type structure, and coaxially mounted in multiple
stages as in FIG. is there. The magnetized state of the magnet 13 is such that the upper surface is
N and the lower surface is S, and the other magnet 21 has an upper surface S and a lower surface
N. Thus, the opposite magnetic poles of the magnets 13 and 21 have the same polarity Due to
the arrangement, the magnetic fluxes of the upper and lower magnetic circuits 1 ° 2 do not
repel each other and mix with each other, thereby eliminating the influence between the
magnetic fluxes and eliminating the decrease of the magnetic flux density in the gate 13. In order
to better understand the effects of the present invention, referring to the table, the magnetic flux
density (Gauss) in each magnetic gap in FIG. 2 and FIG. 1, and both magnetic circuits were
separately measured. The gap flux densities of the cases are shown respectively. As is apparent
from the measurement takes shown in this table, the magnetic flux density according to the
configuration of FIG. 2 of the present invention is not only increased compared to the
configuration of FIG. 1, but is separately measured separately and measured. The reason for the
fact that the magnetic flux density in the structure of the present invention is higher than in the
case where the separation is further increased than in the case is that the leakage flux is present
in the former, while It is considered that this is because the magnetic fluxes of one another repel
each other due to the same polarity of. According to the present invention, there is an advantage
that the magnetic flux density in the magnetic gear knob is significantly increased in comparison
with the conventional 11tll, or in comparison with that in the case of individually assembling
alone. Thus, a high sensitivity composite speaker can be obtained. In the above description, the
polarity of the magnetic pole is limited as shown in FIG. 2. However, the present invention is not
limited to this but may be arranged to have the opposite polarity to that of FIG. It is good if it
becomes the same polarity 0,
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