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JP2015532063

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DESCRIPTION JP2015532063
An outer diaphragm (21) having an outer diaphragm (21) for operating in a low frequency range
and an inner diaphragm (23) for operating in a high frequency range, both diaphragms being
located in a common speaker frame (10) 21) connected to an outer voice coil (22) connected to
the inner voice coil (24) connected to the inner diaphragm (23), and two magnets (31, 32)
coaxially arranged Coaxial loudspeaker arrangement with ferrite cores (41, 42, 43), wherein the
voice coils (22, 24) extend into the air gap (51, 52) between the ferrite cores and the diaphragm
is a flexible suspension Coaxial loudspeaker arrangement connected to the loudspeaker frame
(10) via members (11-14). In the provided speaker, the inner core (41) and the outer core (42),
which are separated from each other via the inner air gap (52), are located between the outer
magnet (31) and the inner magnet (32); One ferrite core (43a) of the magnet (31) is separated
from the outer core (42) located between the two magnets via the outer air gap (51), and the
voice coil of the outer diaphragm (21) 22) extend into the outer air gap (51) and the voice coil
(24) of the inner diaphragm (23) extend into the inner air gap (52). [Selected figure] Figure 1
Coaxial speaker arrangement
[0001]
The invention has an outer diaphragm for operating in the low frequency range and an inner
diaphragm for operating in the high frequency range, both diaphragms being located in a
common speaker frame and connected to the outer diaphragm, an outer voice coil A coaxial
speaker arrangement having an inner voice coil connected to the inner diaphragm, two magnets
arranged coaxially, and a ferrite core connected to the magnet, wherein the voice coil is an air
gap between the ferrite cores Coaxial speaker arrangement, wherein the diaphragm is connected
to the speaker frame via a flexible suspension member.
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1
[0002]
Speakers as electro-acoustic transducers are known in many different forms (in terms of power
and frequency range).
Since a single diaphragm speaker is not suitable for providing perfect performance over the
entire audio frequency band, more, preferably two (high frequency and two) to provide better
acoustic performance. Combine the low frequency) or three (high, mid and low frequency)
speakers in the speaker system. These speakers may be connected to the output of the acoustic
power amplifier through a two-way or three-way crossover. In general, a loudspeaker system
having a plurality of loudspeakers of this kind can only be attached to relatively large
loudspeaker boxes.
[0003]
In order to reduce the required space and thereby reduce the size of such a loudspeaker box, the
solution is provided by arranging the various loudspeakers coaxially in a common frame. Current
loudspeakers of automotive radios and automotive amplifiers generally provide a relatively wide
frequency range which requires less space in a coaxial arrangement. Because of their smaller
size, coaxial speakers have lower power, for example, the current load capacity is more limited
compared to larger sized multi-speaker systems. Increasing the voltage or current load in such
conventional multi-speaker systems results in increased distortion and reduced life.
[0004]
German patent DE 1991 13 558 discloses a coaxial loudspeaker in which the voice coil of the
outer subwoofer diaphragm and the voice coil of the inner tweeter diaphragm, between the
ferrite cores, are disclosed. There is only one common magnetic circuit. The speakers are small
and lightweight, but are not suitable for providing higher audio output. Another problem arises
from the fact that both voice coils of the diaphragm move in a magnetic field of substantially the
same strength and cause distortion without proper frequency dependent compensation.
[0005]
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In U.S. Pat. Nos. 6,963,650 and 4,821,331, voice coils of a subwoofer diaphragm and voice coils
of a tweeter diaphragm are ferrites in two different magnetic circuits. A coaxial speaker is
disclosed which is located between the cores. These solutions offer the possibility to control
different voice coils with magnetic fields of different strengths, but the two diaphragms are
placed on top of each other in two planes, making fabrication difficult and weight Becomes large.
[0006]
German Patent No. 19913558 U.S. Patent No. 6,963,650 U.S. Patent No. 4,821,331
[0007]
Accordingly, it is an object of the present invention to provide a coaxially arranged loudspeaker,
which is relatively small in size, high in audio output, wide in audio frequency band, and large in
current load capacity.
It is another object of the present invention to provide a coaxial speaker arrangement with low
distortion and high power and long life, in contrast to similar speakers known in the prior art.
[0008]
The object of the invention is generally achieved with a coaxial loudspeaker arrangement
according to claim 1. Other advantageous embodiments and examples can be found in the
dependent claims.
[0009]
The invention has an outer diaphragm for operating in the low frequency range and an inner
diaphragm for operating in the high frequency range, both diaphragms being located in a
common speaker frame and connected to the outer diaphragm, an outer voice coil A coaxial
speaker arrangement having an inner voice coil connected to the inner diaphragm, two magnets
arranged coaxially, and a ferrite core connected to the magnet, wherein the voice coil is an air
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gap between the ferrite cores Coaxial speaker arrangement, wherein the diaphragm is connected
to the speaker frame via a flexible suspension member. According to one aspect of the invention,
the coaxial loudspeaker arrangement comprises an inner core and an outer core separated from
each other via an inner air gap between the outer magnet and the inner magnet, wherein one
ferrite core of the outer magnet is provided. Separates from the outer core located between the
two magnets via the outer air gap, the voice coil of the outer diaphragm extends into the outer
air gap, and the voice coil of the inner diaphragm extends into the inner air gap .
[0010]
With such a design, the two voice coils operate with magnetic fields of different strengths, and
the two magnets provide both voice coils with a sufficiently large magnetic field. As the magnetic
field increases, the sensitivity and power of the speaker increases. Voice coils operating in
magnetic fields of different strengths reduce speaker distortion even at high power.
[0011]
In one preferred embodiment, at least a portion of the inner magnet and at least a portion of the
outer magnet are located in the same plane. This configuration can reduce the size of the
speaker. Furthermore, in this configuration, the upper plane of the inner magnet is preferably
located above the upper plane of the outer magnet near the upper plane of the outer magnet, and
the lower plane of the inner magnet is above and below the outer magnet Located between the
plane.
[0012]
According to another aspect of the invention, the outer magnet is located between the lower core
and the upper core (polar core), and the outer diameters of the two ferrite cores are substantially
equal to the outer dimensions of the outer magnet The air gap between the inner diameter of the
upper ferrite core and the outer diameter of the outer ferrite core is determined according to the
size of the outer voice coil. The upper plane of the outer magnet is substantially coplanar with
the upper plane of the upper ferrite core, and the upper plane of the inner ferrite core is lower
than the upper plane of the outer ferrite core near the upper plane of the outer ferrite core
Located in
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[0013]
In another advantageous embodiment, the outer ferrite core comprises a head adjacent to the
inner voice coil and a foot in intimate contact with the inner ferrite core, the inner diameter of
the head of the outer ferrite core and the inner ferrite core The air gap between the outer
diameter and the outer diameter is determined according to the size of the inner voice coil.
[0014]
In another preferred embodiment, an intermediate cavity is formed between the head and foot of
the outer ferrite core, the head comprising a conical surface extending from the upper outer wall
to the lower inner wall.
[0015]
The inner ferrite core is substantially cylindrical with a recess in the upper portion to
accommodate the inner magnet.
This recess can be used, for example, to locate the inner magnet, for example to place the inner
magnet coaxially with the loudspeaker axis.
[0016]
The upper flat surface of the inner ferrite core is preferably positioned higher than the upper flat
surface of the inner magnet, whereby the inner magnet inserted into the inner ferrite core
adheres within the recess of the inner ferrite core in the form of a circular disc May be covered
with a ferrite core.
[0017]
In the lower region of the outer surface of the inner ferrite core, a circumferential recess is
formed to be in intimate contact with the inner edge of the lower ferrite core.
This recess can be used, for example, to locate the inner ferrite core, for example to place the
inner ferrite core coaxially with the loudspeaker axis.
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[0018]
It is preferable that the N pole and the S pole of the outer magnet face the upper ferrite core and
the lower ferrite core.
[0019]
In a preferred embodiment of the invention, the north and south poles of the inner magnet face
inwards and outwards, and the outwardly facing poles of the inner magnet face the poles of the
outer magnet facing the upper ferrite core It is the same.
[0020]
In another preferred embodiment of the present invention, at least one of the voice coils has a
plurality of layers, and the number of turns overlapping one another can be varied according to
the coils.
In one preferred embodiment, the voice coil is conical in cross section, with more turns
overlapping on the diaphragm side and less on the opposite side of the diaphragm.
Such a configuration substantially reduces the unpleasant acoustic effects that occur when
connecting a driving power amplifier or when the level of the audio frequency signal changes
significantly, as is generally known in conventional loudspeakers. May be helpful.
[0021]
The magnet used in the loudspeaker arrangement according to the invention is a permanent
magnet made of neodymium or a material comprising neodymium.
[0022]
The invention will be described in more detail with reference to the illustrated embodiments.
[0023]
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FIG. 5 is a side cross-sectional view of a coaxial loudspeaker arrangement according to the
invention.
FIG. 2 is an enlarged detail of the coaxial loudspeaker arrangement of FIG. 1;
Figure 2 is an enlarged detail of the voice coil of the coaxial loudspeaker arrangement of Figure
1;
5 is a frequency response graph of a coaxial loudspeaker arrangement according to the
invention.
[0024]
FIG. 1 shows a side sectional view of a coaxial loudspeaker arrangement according to the
invention. As can be seen from this figure, the coaxial loudspeaker arrangement comprises a
common loudspeaker frame 10, which comprises a disc-like base plate 11 with radially extending
ribs connected to the periphery and terminated at this periphery . The speaker frame is basically
non-magnetic and thus can be made of plastic material. In order to withstand high deformation
stresses and forces, it may preferably be made of nonmagnetic metals, preferably of aluminum or
an aluminum alloy. A speaker frame made of metal such as aluminum is also suitable for heat
conduction.
[0025]
An outer diaphragm 21 operating in the low frequency band and comprising an outer voice coil
22 is fixed to the upper and lower rims via flexible suspension members (spiders) 12 and 13. An
inner diaphragm 23 having an inner voice coil 24 and operating in a high frequency band is
disposed concentrically with the outer diaphragm and fixed to an outer ferrite core 42 via a
flexible suspension member (spider) 14. The loudspeaker arrangement comprises two magnets
31 and 32 arranged coaxially, the ferrite cores 41, 42 and 43 being in communication with the
magnets. Voice coils 22 and 24 extend into air gaps 51, 52 between the ferrite cores. The outer
diaphragm 21 is connected to the speaker frame 10 via the flexible suspension members 12 and
13. The inner diaphragm 14 is connected to the ferrite core 42 via the flexible suspension
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member 14. The opening of the inner diaphragm 23 is covered by a dust cap 25.
[0026]
Furthermore, an inner core 41 and an outer core 42 are provided, which are located between the
outer magnet 31 and the inner magnet 32 and are separated from one another by an inner air
gap 52. The upper ferrite core 43a above the outer magnet 31 is separated by the outer air gap
51 from the outer core 42 located between the two magnets. The voice coil 22 of the outer
diaphragm 21 extends into the outer air gap 51 and the voice coil 24 of the inner diaphragm 23
extends into the inner air gap 52. Surprisingly, we have found that with such a magnet
configuration, the output of the loudspeaker is improved, the distortion is reduced and the
current load capacity is increased.
[0027]
At least a portion of the inner magnet 32 and at least a portion of the outer magnet 31 are
located in the same plane. In the configuration shown in the drawings, the upper plane of the
inner magnet 32 is preferably located above the upper plane of the outer magnet 31 near the
upper plane of the outer magnet 31 and the lower plane of the inner magnet 32 is the outer
magnet It is located between the upper and lower planes of 31.
[0028]
The outer magnet 31 is located between the lower ferrite core 43a and the upper ferrite core
43b, and the outer diameters of the two ferrite cores 43a and 43b are essentially equal to the
outer dimensions of the outer magnet 31. The dimension of the air gap 51 between the inner
diameter of the upper ferrite core 43 a and the outer diameter of the outer ferrite core 42 is
determined according to the dimension of the outer voice coil 22. The dimension of the outer air
gap 51 is 2 to 4 mm, preferably 3 mm.
[0029]
The upper flat surface of the outer ferrite core 42 is located substantially in the same plane as
the upper flat surface of the ferrite core 43 a, and the upper flat surface of the inner ferrite core
41 is adjacent to the upper flat surface of the outer ferrite core 42. It is located below the upper
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plane.
[0030]
The outer ferrite core 42 includes a head portion adjacent to the inner voice coil 24 and a foot
portion in close contact with the inner ferrite core 41.
The dimension of the air gap 52 between the inner diameter of the head portion of the outer
ferrite core 42 and the outer diameter of the inner ferrite core 41 is determined according to the
dimension of the inner voice coil 24. The dimension of the inner air gap 52 is 1 to 2 mm,
preferably 1.5 mm.
[0031]
Further, an intermediate hollow portion is formed between the head portion and the foot portion
of the outer ferrite core 42, and the head portion has a conical surface extending from the upper
outer wall to the lower inner wall. The inner ferrite core 41 is substantially cylindrical in shape
with a recess in the upper portion for receiving the inner magnet 32.
[0032]
Since the upper flat surface of the inner ferrite core 41 is located above the upper flat surface of
the inner magnet 32, the inner magnet 32 inserted in the inner ferrite core 41 is in the shape of
a circular disk in the recess of the inner ferrite core 41. It may be covered with a ferrite core 44
that adheres to the The ferrite core 44 is provided with a central opening that is substantially
equal in size to the inner opening of the inner magnet 32. In the illustrated embodiment, the
opening of the ferrite core 44 has a conical wall whose diameter is smaller than that of the ferrite
core and equal to the inner diameter of the inner magnet 32, and the diameter of the opening
decreases upward. In the lower region of the outer surface of the inner ferrite core 41, a
circumferential recess is formed to be in close contact with the inner edge of the lower ferrite
core 43b.
[0033]
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The N pole and the S pole of the outer magnet 31 are directed to the upper ferrite core and the
lower ferrite core 43a, 43b. The north pole and the south pole of the inner magnet 32 face the
inside and the outside, respectively, and the pole of the inner magnet 32 facing the outside, the
north pole of the drawing faces the pole of the outer magnet 31 facing the upper ferrite core
43a. Is the same as
[0034]
If at least one of the voice coils used has a coil consisting of several layers, it is advantageous for
the number of turns that overlap one another to be variable depending on the coil. The layer
thickness of the variable coil is such that in the air gap region where the strength of the magnetic
field is strong, a smaller layer, for example, one layer is applied, and further more layers, for
example, two or three layers are applied. Is preferably achieved. As shown in the example of
FIGS. 3a and 3b, the voice coil is substantially conical in cross section, with more turns
overlapping on the diaphragm side and less on the opposite side of the diaphragm. In FIG. 3a the
thickness of the layer changes in stages, whereas in FIG. 3b the thickness of the layer changes
more continuously than this, but this is because the wires of the individual layers are partially
wound It is because it is located in the gap. Depending on the requirements and features to be
achieved, it is also possible to determine the number of turns or coil layers that change linearly
or non-linearly along the axis.
[0035]
The material used for the permanent magnet includes neodymium or neodymium, and an alloy of
neodymium such as N52. The use of such magnetic materials or similarly strong magnets can
increase the sensitivity and power of the speaker assembly.
[0036]
The parts of the speaker assembly are made to simplify the production and assembly as well as
to allow for proper placement and positioning of the individual parts. The lower ferrite core 43b
is fitted in the cylindrical recess of the speaker frame 10, and the lower ferrite core has a central
opening for receiving and positioning the inner core 41 having the fitting recess. The ferrite core
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43 b supports the outer magnet 31, and the outer magnet is also surrounded by the cylindrical
inner wall of the speaker frame 10. The outer ferrite core 42 may be moved towards the inner
ferrite core 41, in which case the outer core is in intimate contact with the outer diameter of the
inner ferrite core 41. The upper ferrite core 43a may be disposed on the outer magnet 31. In this
case, the outer diameter of the upper core is in close contact with the inner diameter of the
receiving recess of the speaker frame 10. The inner magnet 32 can be received in the inner
recess of the inner ferrite core 41, where the upper flat surface of the inner magnet 32 is located
below the upper flat surface of the inner ferrite core 41. The inner magnet 32 may be covered by
a disc-shaped ferrite core 44. The individual elements which are in intimate contact with one
another are all located coaxial to the axis of the loudspeaker 15. The magnet and the ferrite core
may be attached to the speaker frame 10 and attached to each other, for example by an adhesive.
[0037]
After the respective magnet and ferrite core portions are mounted, the outer diaphragm can be
inserted, followed by the insertion of the inner diaphragm, which can be mounted via the flexible
suspension members.
[0038]
FIG. 4 shows a frequency response graph of a coaxial loudspeaker arrangement according to the
invention.
In this graph, the horizontal axis indicates the frequency in Hz on a logarithmic scale, and the
vertical axis indicates the output of the speaker in dB. The nominal power of the speakers was
150 W and the average sound pressure was 100 dB. As illustrated, the frequency range of the
speaker was 50 Hz to 10 kHz, and the lowest sound pressure was 100 dB. In the loudspeaker
configuration used for the measurement, the diameter of the outer diaphragm (subwoofer) is 35
cm, the diameter of the outer voice coil is 9.7 cm, the diameter of the inner diaphragm (tweeter)
is 12.5 cm, and the diameter of the inner voice coil is 6.0 cm Met. The magnetic fluxes of the
outer and inner magnets were 1.4 T and 2.2 T, respectively.
[0039]
Although the invention has been described in detail on the basis of the illustrated examples and
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embodiments, it will be obvious to a person skilled in the art that many other modifications are
possible within the scope of the invention as defined in the claims. is there. Accordingly, the
present invention is not limited to the illustrated embodiment.
[0040]
Reference Signs List 10 speaker frame 11 base plate 12 to 14 flexible suspension member
(spider) 15 axis 21 outer diaphragm 22 outer voice coil 23 inner diaphragm 24 inner voice coil
25 dust cap 31 outer magnet 32 inner magnet 41 inner core 42 outer core 43a (upper ) Ferrite
core 43 b (bottom) Ferrite core 44 Ferrite core 51 Outer air gap 52 Inner air gap
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