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DESCRIPTION JPH04112595

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DESCRIPTION JPH04112595
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a composite
direct radiation system in which a magnetic circuit of a main speaker for direct acoustic radiation
to the outside and a magnetic circuit of an auxiliary speaker for assisting the operation of the
main speaker are integrated. About the speaker.
[0002]
PRIOR ART A cabinet is divided into two by a partition plate, a main speaker for radiating the
sound directly to the outside is provided on the front, and an auxiliary speaker for assisting the
movement is provided on the partition plate in the cabinet For example, in the composite direct
emission speaker disclosed in Japanese Utility Model Publication No. 50-12366 shown in FIG. 3,
a composite direct type of integrated structure in which the magnetic circuit and frame of the
main speaker and the auxiliary speaker are shared to achieve further miniaturization. Radiation
speakers have been proposed.
[0003]
FIG. 2 is a cross-sectional view of a conventional integral type composite direct emission speaker
disclosed in, for example, Japanese Patent Application No. 63-142897.
In the figure, 1 is a frame, 2a is a main diaphragm performing acoustic radiation directly to the
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outside, 2b is an auxiliary diaphragm assisting the operation of the main diaphragm, 3a is a first
spider, 3b is a second spider, and 4a is a second diaphragm. First voice coil, 4b: second voice coil,
5a: top plate, 5b: second plate, 6: nonmagnetic support for supporting the top plate 5a, 7: ring
magnet, 8: bottom yoke, A gap 9 for driving the main diaphragm 2a by the pole piece 9 and the
second plate 5b is a gap for driving the auxiliary diaphragm by the first air gap 11a and the top
plate 5a and the second plate 5b. The second air gap 11b.
[0004]
In the conventional integrated composite direct emission speaker configured as described above,
the magnetic flux Φ generated from the ring magnet 7 disposed at the outer peripheral portion
flows in the magnetic circuit to form the first and second air gaps. It is led to 11a, b. Assuming
that Φ is a magnetic flux without leakage, let Bg1 be the magnetic flux density passing through
the first air gap 11a, S1 be the passing cross sectional area, Bg2 be the magnetic flux density
passing through the second air gap, and S2 be the passing cross sectional area The magnetic flux
densities Bg1 and Bg2 are Bg1 = Φ / S1 and Bg2 = Φ / S2.
[0005]
When a conventional direct radiation type speaker is attached to a small cabinet, air in the
cabinet acts as a back pressure to prevent vibration, making it difficult to reproduce bass. In the
composite direct radiation speaker of an integral structure shown in FIG. 2, the main diaphragm
2a and the auxiliary diaphragm 2b are driven in the same phase so that the volume velocity is
constant, so that they are surrounded by two diaphragms. The pressure in the air chamber is
kept constant. As a result, since the main diaphragm 2a can emit sound without being affected by
the back pressure in the cabinet, it is possible to perform sufficient bass reproduction even when
mounted on a small cabinet.
[0006]
[0006] In the case of the composite direct radiation speaker of integral structure shown in FIG. 2,
which comprises a main diaphragm for emitting acoustic radiation directly to the outside and an
auxiliary speaker for assisting its operation, Because the radius from the center of the magnetic
circuit to the first air gap for driving the main diaphragm and the radius to the second air gap for
the auxiliary diaphragm are different, each air gap portion through which the magnetic flux
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passes The cross-sectional area of the As a result, as apparent from the equations of Bg1 and
Bg2, the magnetic flux 発 生 generated from one ring magnet is supplied to two air gaps having
different cross sectional areas, so that the cross sectional area of the second air gap having a
large cross sectional area It is considerably smaller than the magnetic flux density obtained in the
small first air gap. Therefore, it is difficult to realize an acoustic constant design value for
increasing the efficiency of the second diaphragm having a low magnetic flux density. As a result,
it becomes difficult to perform the same phase driving and to make the volume velocity constant,
and it becomes difficult to obtain the flat characteristic of the output sound pressure. Further,
since the ring magnet for supplying the magnetic flux to the two air gaps is provided on the outer
periphery of the magnetic circuit, there is a problem that it is extremely difficult to reduce the
size of the magnetic circuit to the outer diameter size of the magnet or less. The
[0007]
The present invention has been made to solve the above problems, and it is a composite direct
emission speaker in which the magnetic flux density of each air gap for the main diaphragm and
for the auxiliary diaphragm can be set individually. The purpose is to obtain a combined direct
emission speaker that is smaller than the conventional combined direct emission speaker.
[0008]
SUMMARY OF THE INVENTION In the composite direct emission speaker according to the
present invention, the outer diameter of the magnet is within the distance from the diameter of
the first air gap to the diameter of the second air gap. And a ring-shaped magnetic material
having an inner diameter and smaller than the inner diameter of the ring magnet and larger than
the diameter of the first air gap with a gap interposed between the magnetic circuit and the
magnetic circuit; Instead of the pole piece portion, a cylindrical magnet magnetized in the axial
direction and a plate on the top thereof are used to generate a magnetic flux by these two
magnets.
[0009]
In the integrated composite direct emission speaker according to the present invention, since the
magnetic material rings having a diameter slightly smaller than that of the ring magnet are
juxtaposed with the magnetic gap interposed therebetween, the magnetic flux generated from the
ring magnet is It mainly flows to the second air gap with less magnetic resistance.
Further, the magnetic flux generated from the center magnet provided in the pole piece of the
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magnetic circuit is efficiently guided to the first air gap by the plate at the top.
Therefore, the magnetic flux of the center magnet is mainly supplied to the first air gap for the
main diaphragm, and the ring magnet is mainly supplied the magnetic flux to the second air gap
for the auxiliary diaphragm. The magnetic flux density of each air gap can be individually set to a
desired value by changing the characteristics or the volume.
[0010]
Further, since the ring magnet, which is conventionally disposed outside the second air gap, can
be installed inside the magnetic circuit, the magnetic circuit can be miniaturized.
[0011]
EXAMPLES Example 1
Hereinafter, an embodiment of the present invention will be described. In FIG. 1, 1 is a frame, 2a
is a main diaphragm that directly radiates sound to the outside, 2b is an auxiliary diaphragm that
assists the operation of the main diaphragm, 3a is a first spider, 3b is a second spider, 4a Is a
first voice coil, 4b is a second voice coil, 5a is a top plate, 5c is a center plate, 7 is a ring magnet,
8 is a bottom yoke, 10 is a center magnet, and mainly composed of a center plate 5c and a top
plate 5a The air gap for driving the diaphragm 2a is the first air gap 11a, and the air gap for
driving the auxiliary diaphragm 2b by the top plate 5a and the bottom yoke 8 is the second air
gap 11b. A magnetic material ring disposed between the center magnet 10 and the magnetic
material ring 15 is a magnetic gap provided between the ring magnet 7 and the magnetic
material ring 14.
[0012]
In the composite direct radiation speaker of the above configuration shown in FIG. 1, the
dimensions of the ring magnet 7 in FIG. 2 as the prior art are made smaller than the diameter of
the second air gap 11b, and the first air gap Since the magnetic gap 15 is sandwiched between
the magnetic material ring 14 larger than the diameter of the magnetic material 11a and the
magnetic gap 15, the magnetic flux generated from the ring magnet 7 flows to the second air gap
11b having a small magnetic resistance. Further, instead of the pole piece 9 of the conventional
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example shown in FIG. 2, since the cylindrical center magnet 10 magnetized in the axial direction
similar to the ring magnet 7 and the center plate 5c are provided on the upper portion, The
magnetic flux generated from the center magnet 10 is efficiently supplied to the first air gap 11a,
and flows in the magnetic material ring 14 while slightly interfering with the magnetic flux
generated from the ring magnet 7. As described above, the center magnet 10 mainly supplies
magnetic flux to the first air gap 11a, and the ring magnet 7 mainly supplies magnetic flux to the
second air gap 11b. As a result, for each air gap, the magnetic flux density obtained in each air
gap can be individually set to a desired value by the inner and outer individual magnets.
[0013]
Further, since the ring magnet 7 disposed outside the second air gap 11b shown in the
conventional example can be installed inside the magnetic circuit, the magnetic circuit can be
miniaturized.
[0014]
As described above, according to the composite direct radiation speaker of the integral structure
of the present invention, the dimensions of the ring-shaped magnet constituting the external
magnet type magnetic circuit of the outer peripheral portion of the magnetic circuit A ring shape
having an outer diameter and an inner diameter that fits in the distance from the diameter of one
air gap to the diameter of the second air gap, the ring being smaller than the inner diameter of
the ring magnet and larger than the diameter of the first air gap As a circular magnet is provided
in the magnetic circuit with a gap-like magnetic material interposed between the magnetic circuit
and a columnar magnet magnetized in the axial direction in the pole piece portion in the
magnetic circuit, and a disk-shaped plate is provided on the top A cylindrical magnet mainly
supplies magnetic flux to the first air gap for the main diaphragm, and a ring-shaped magnet
mainly supplies magnetic flux to the second air gap for the auxiliary diaphragm. Because the
individual inside and outside By adjusting the stone, the magnetic flux density of each air gap
portion for the main diaphragm and the auxiliary diaphragm can be set individually to a desired
value, and as a result, the flat characteristic of the output sound pressure is obtained. Be
effective.
Further, since the ring magnet, which is conventionally disposed outside the second air gap, can
be installed inside the magnetic circuit, the magnetic circuit can be miniaturized.
[0015]
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Brief description of the drawings
[0016]
1 is a cross-sectional view showing a composite direct emission speaker according to an
embodiment of the present invention.
[0017]
2 is a cross-sectional view of a conventional integrated composite direct radiation speaker.
[0018]
FIG. 3 is a schematic view of a conventional combined direct emission speaker system.
[0019]
Explanation of sign
[0020]
1 frame 2a main diaphragm or main speaker 2b auxiliary diaphragm or auxiliary speaker 3a first
spider 3b second spider 4a first voice coil 4b second voice coil 5a top plate 5b second plate 5c
center plate 6 Supporter 7 Ring magnet 8 Bottom yoke 9 Pole piece 10 Center magnet 11a First
air gap 11b Second air gap 12 Partition plate 13 Cabinet 14 Magnetic material ring 15 Magnetic
air gap
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