JPH05328473

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DESCRIPTION JPH05328473
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker system for bass reproduction, and more particularly to improvement of the sound
quality of a speaker system for bass reproduction by Kelton system using a direct radiation type
speaker unit.
[0002]
2. Description of the Related Art FIG. 4 is a cross-sectional view showing a conventional Keltontype bass reproduction speaker system disclosed in, for example, Japanese Utility Model
Application Laid-Open No. 3-101094. In the figure, reference numeral 1 denotes a speaker unit,
and 2 denotes a baffle plate on which the speaker unit 1 is disposed. The inside of the cabinet is
divided into a first air chamber 3 and a second air chamber 4 by the baffle plate 2. An acoustic
port 5 is provided in the first air chamber 3.
[0003]
The conventional Kelton type speaker system is configured as described above, and by driving
the speaker unit 1, the compliance component inside the first air chamber 3 and the mass
component of the acoustic port 5 cause Helmholtz resonance to generate acoustics. Do radiation.
[0004]
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When a speaker system having a high bass reproduction capability is manufactured using the
Kelton system, design is made such that the Helmholtz resonance occurs at a sufficiently low
frequency.
When the volume of the cabinet and the opening area of the acoustic port 5 are constant, the
Helmholtz resonance frequency is lowered by extending the pipe length of the acoustic port 5,
and it becomes possible to reproduce lower frequencies. At this time, the lower the lowest
resonance frequency of the speaker unit, the more efficient the acoustic radiation can be. A
speaker unit having a low minimum resonance frequency generally has a heavy mechanical mass
of the vibration system, and the amplitude is large due to the high compliance, and the
mechanical vibration propagating to the baffle plate 2 tends to be large.
[0005]
Since the conventional Kelton system speaker system as described above is configured as
described above, when manufacturing a speaker system with high bass reproduction capability, a
speaker unit with a low minimum resonance frequency is required. The use of the cabinet
increases the vibration of the cabinet, and further requires a long acoustic port which is
structurally unstable, which causes unnecessary mechanical vibration of the entire cabinet and
the acoustic port, resulting in generation of abnormal noise and the like.
[0006]
The present invention has been made to solve the above-mentioned problems, and it is an object
of the present invention to obtain a speaker system for bass reproduction, which suppresses
unnecessary mechanical vibration generated in a cabinet and an acoustic port and prevents
generation of abnormal noise. .
[0007]
According to the present invention, there is provided a speaker system for bass reproduction
according to the present invention, wherein a second cabinet is provided inside a first cabinet
provided with an acoustic port, and the first speaker unit is mounted on the second cabinet. And
the second speaker unit are arranged back to back, and the magnetic circuit of the first speaker
unit and the magnetic circuit of the second speaker unit are in contact with each other through
the spacer made of the nonmagnetic material. .
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[0008]
In addition, a second cabinet is provided inside the first cabinet provided with the sound port,
and the first speaker unit and the second speaker unit are arranged back to back in this second
cabinet, and The magnetic circuit of the first speaker unit and the magnetic circuit of the second
speaker unit sandwich and hold a part of the acoustic port.
[0009]
In addition, a second cabinet is provided inside the first cabinet provided with the sound port,
and the first speaker unit and the second speaker unit are arranged in the second cabinet so as to
be back to back, The magnetic circuit of the speaker unit and the magnetic circuit of the second
speaker unit sandwich and hold a part of the acoustic port, and the magnetic circuit of the first
speaker unit and the magnetic circuit of the second speaker unit are acoustic ports Is also used
as part of the outer wall of the
[0010]
In the speaker system for reproducing low-pitched sound according to the present invention, the
magnetic circuit of the first speaker unit and the magnetic circuit of the second speaker unit
arranged back to back are in contact with each other through the spacer of nonmagnetic
material. Mechanical vibrations of the speaker unit and the second speaker unit are offset,
unnecessary vibrations transmitted to the cabinet are reduced, and the generation of abnormal
noise resulting therefrom can be suppressed.
[0011]
In addition, when the magnetic circuit of the first speaker unit and the magnetic circuit of the
second speaker unit arranged back to back sandwich the acoustic port, mechanical vibration of
the first speaker unit and the second speaker unit is It is possible to offset and reinforce a part of
the acoustic port, and to suppress the generation of noise due to mechanical vibration of the
cabinet or the acoustic port.
[0012]
In addition, the magnetic circuit of the first speaker unit and the magnetic circuit of the second
speaker unit disposed back to back share the part of the outer wall of the acoustic port, so that
the machine of the first speaker unit and the second speaker unit Since the vibration can be
canceled and part of the acoustic port can be reinforced, generation of abnormal noise due to
mechanical vibration of the cabinet or the acoustic port can be suppressed, and further cooling of
the magnetic circuit which becomes high temperature by air passing inside the acoustic port it
can.
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[0013]
EXAMPLES Example 1
FIG. 1 is a cross-sectional view showing a low-pitched sound reproducing speaker system
according to a first embodiment of the present invention.
In the figure, 10a is a first speaker unit, 10b is a first magnetic circuit for driving the first
speaker unit 10a, and 11a is a second speaker unit disposed back to back at the back of the first
speaker unit 10a. 11b is a second magnetic circuit for driving the second speaker unit 11b, 12 is
a spacer made of nonmagnetic material inserted between the first magnetic circuit 10b and the
second magnetic circuit 11b, 14 is a first cabinet A second cabinet is installed in the interior of
13 to attach the first speaker unit 10a and the second speaker unit 11a, and 5 is an acoustic port
provided in a part of the first cabinet 13.
[0014]
In the bass reproduction speaker system of the first embodiment configured as described above,
the magnetic circuit 10b of the first speaker unit 10a and the magnetic circuit 11b of the second
speaker unit 11a, which are driven in the same phase, form the spacer 12. Since back-to-back
contact occurs, mechanical vibrations generated when the respective speaker units are driven are
transmitted through the spacer 12 and offset, and unnecessary vibration of the first cabinet 13
and the second cabinet 14 is It is possible to suppress the generation of abnormal noise caused
by this.
[0015]
Although the spacer 12 has been described as being made of a nonmagnetic material in order to
prevent magnetic flux leakage from the magnetic circuit, the first magnetic circuit 10b and the
second magnetic circuit 11b have a magnetic barrier structure, or the spacer 12 It is needless to
say that the same effect can be obtained even if the spacer 12 itself is made of a magnetic
material if any magnetic shielding treatment is applied to the contact portion between the
magnetic circuit and the magnetic circuit.
[0016]
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Example 2
FIG. 2 is a cross-sectional view of a low-pitched sound reproducing speaker system according to a
second embodiment of the present invention.
In the figure, 15a is a first spacer inserted between the magnetic circuit 10b of the first speaker
unit 10a and the acoustic port 5, and 15b is inserted between the magnetic circuit 11b of the
second speaker unit 11a and the acoustic port 5 Second spacer.
The other components are the same as those of the first embodiment, and thus the description
thereof is omitted.
[0017]
In the speaker system for bass reproduction according to the second embodiment configured as
described above, the magnetic circuit 10b of the first speaker unit 10a and the magnetic circuit
11b of the second speaker unit 11a which are driven in the same phase are the first. The back-toback contact between the spacer 15a, the acoustic port 5 and the second spacer 15b cancels the
mechanical vibration generated when each speaker unit is driven, and the acoustic port 5 is
further structurally unstable. Since the first cabinet 13 and the second cabinet 14 and the
acoustic port 5 are not supported, the generation of abnormal noise can be prevented.
[0018]
Example 3
FIG. 3 is a cross-sectional view of a low-pitched sound reproducing speaker system according to a
third embodiment of the present invention.
In the figure, constituent parts denoted by the same reference numerals as those in the abovementioned embodiment indicate the same or corresponding parts, and therefore the description
will be omitted.
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[0019]
In the speaker system for bass reproduction according to the third embodiment configured as
described above, the magnetic circuit 10b of the first speaker unit 10a and the magnetic circuit
11b of the second speaker unit 11a which are driven in the same phase are the acoustic port 5
Back-to-back contact, so that the mechanical vibration generated when each speaker unit is
driven is offset, and further supporting a part of the structurally unstable acoustic port 5, the
first cabinet Unnecessary vibration of the cabinet 13 and the second cabinet 14 and the acoustic
port 5 can be suppressed, and the generation of abnormal noise due to this can be prevented.
In addition, since the first magnetic circuit 10b and the second magnetic circuit 11b are also
used as part of the outer wall of the acoustic port 5, the magnetic circuit that becomes high
temperature is efficiently cooled by the air passing through the acoustic port 5 inside. be able to.
[0020]
As described above, according to the present invention, the magnetic circuit of the first speaker
unit and the magnetic circuit of the second speaker unit arranged back to back contact each
other through the spacer of the nonmagnetic material. Since it comprised, the mechanical
vibration of a 1st speaker unit and a 2nd speaker unit is offset, the unnecessary vibration
transmitted to a cabinet reduces, and generation ¦ occurrence ¦ production of the noise resulting
from this can be suppressed.
[0021]
In addition, since the magnetic circuit of the first speaker unit and the magnetic circuit of the
second speaker unit arranged back to back are configured to hold the acoustic port, the first
speaker unit and the second speaker unit are The mechanical vibration can be offset and a part
of the acoustic port can be reinforced, so that the generation of noise due to the mechanical
vibration of the cabinet or the acoustic port can be suppressed.
[0022]
In addition, since the magnetic circuit of the first speaker unit and the magnetic circuit of the
second speaker unit arranged back to back share the part of the outer wall of the sound port, the
first speaker unit and the second speaker are arranged. The mechanical vibration of the unit is
offset and part of the acoustic port can be reinforced, so that the generation of abnormal noise
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due to mechanical vibration of the cabinet or the acoustic port can be suppressed, and the
magnetic circuit which becomes hot by the air passing inside the acoustic port It can be cooled
well.
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