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JP2005151236

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DESCRIPTION JP2005151236
PROBLEM TO BE SOLVED: To provide a speaker system in which the entire cabinet can be
miniaturized while reproducing the entire band is enabled while enhancing bass. SOLUTION: A
partition plate 2 is interposed between a first air chamber 3 kept in a sealed state and a second
air chamber 4 provided with an acoustic duct 5 so as to constitute an integrated cabinet 1, The
first speaker unit 7 is disposed on the baffle plate provided in the first air chamber 3 so that the
radiation surface faces the outside of the cabinet 1, and the acoustic radiation surface faces the
first or second air chamber 4 Thus, the second speaker unit 8 is disposed on the partition plate 2.
[Selected figure] Figure 1
????????
[0001]
The present invention relates to a speaker system that improves bass reproduction capability
while achieving downsizing.
[0002]
Generally, in audio-visual devices such as television receivers and audio devices, a speaker
system using Helmholtz's resonance is often employed in order to enhance rich bass and
reproduce with rich presence.
In particular, in a speaker system dedicated to bass, the Kelton system is often adopted because it
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can be relatively compactly constructed without using a long horn or the like, and has been put
to practical use.
[0003]
FIG. 12 is a cross-sectional view showing an example of a speaker system configured by the
conventional Kelton system, in the cabinet 100 constituting the speaker system, the speaker unit
101 is fixed to the partition plate 102 in the cabinet 100, The inside of the cabinet 100 is divided
into a first air chamber 103 and a second air chamber 104 by the partition plate 102. Then, the
first air chamber 103 is provided with the acoustic duct 105, and the resonance of the stiffness
of the air of the first air chamber 103 and the air equivalent mass of the portion of the acoustic
duct 105 is utilized to utilize the resonance of the Helmholtz. Radiate.
[0004]
In the Kelton speaker system configured in this way, unlike the phase inversion method (bass
reflex method), the reproduced sound is emitted only from the acoustic duct, so the sound
pressure level characteristic has a frequency characteristic as shown in FIG. Is a characteristic
through a filter from the practical lower limit frequency fl to the upper limit frequency fh. As for
the tendency of the bass characteristic, the bass reflex system is -18 dB / oct. In the Kelton
system, like -12dB / oct. The Kelton scheme is advantageous when considering only the
reproduction of the low-pitched range because
[0005]
In addition, a tandem drive system is known as a speaker system that can be configured
relatively small and enhances bass. FIG. 14 is a cross-sectional view showing an example of a
conventional speaker system configured by a tandem drive system, in the configuration of the
speaker system, the inside of the cabinet 200 is the first air chamber 202 by the partition plate
201 in the cabinet 200. The first speaker unit 204 is disposed in the first air chamber 202 so
that the acoustic radiation surface faces the outside from the baffle surface of the cabinet 200,
and the partition plate 201 is divided into the second air chamber 203 and the second air
chamber 203. An acoustic radiation surface is disposed to face the first air chamber 202.
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[0006]
In the speaker system of the tandem drive system configured as described above, the second
speaker unit 205 is controlled so as to eliminate the pressure of air applied to the back surface of
the diaphragm of the first speaker unit 204, and the first speaker unit 204 The pressure of the
air is substantially zero, and the first speaker unit 204 is disposed on an infinite baffle.
[0007]
In this tandem drive system, the movement of the first speaker unit 204 is assisted by the second
speaker unit 205, but the first speaker unit 204 and the second speaker unit 205 have the same
specifications. However, the bass reproduction capability is inferior to that of the Kelton system
or the phase inversion system.
[0008]
Further, when the first speaker unit and the second speaker unit are driven by the same cabinet
as described above, the vibration directions of the diaphragms of the two speaker units are also
driven in the same direction. Although the reaction to the driving force of the first speaker unit
and the second speaker unit occurs in the same direction in both speaker units, there is a
problem that mechanical vibration due to the reaction is promoted.
[0009]
On the other hand, for the purpose of improving distortion characteristics, a speaker system as
shown in FIG. 15 has been proposed.
In the configuration shown in the figure, the inside of the cabinet 300 is divided into the first air
chamber 302 and the second air chamber 303 by the partition plate 301 in the cabinet 300, and
the acoustic emission surface of the first air chamber 302 is the cabinet 300. The first speaker
unit 304 is disposed so as to face the outside from the baffle surface, and the second speaker
unit 305 is disposed so as to face the second air chamber from the partition plate 301.
[0010]
Therefore, the first air chamber 302 acts as an air chamber of the first speaker unit 304, and the
second air chamber 303 acts as an air chamber of the second speaker unit 305.
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Then, by vibrating the diaphragms of the first speaker unit 304 and the second speaker unit 305
in the same direction, the stiffness of the air chamber of the first speaker unit 304 is ignored.
[0011]
Thereby, the mechanical vibration due to the reaction generated from the second speaker unit
305 can be attenuated by the first air chamber 302, and the influence of the mechanical
vibration due to the reaction of the second speaker unit 305 on the first speaker unit 304 It is
said to reduce the
That is, when the diaphragm of the first speaker unit 304 comes forward, the diaphragm of the
second speaker unit 305 moves backward, and even-order harmonics such as the second
harmonic of each speaker unit It is possible to cancel distortion and improve acoustic
characteristics (for example, Patent Document 1). Unexamined-Japanese-Patent No. 10-224891
[0012]
However, in the case of the speaker system of the above configuration, the second speaker unit
only performs an auxiliary function with respect to the first speaker unit, and the low frequency
band is also reproduced by the first speaker unit. In terms of bass enhancement, it was not
possible to obtain sufficient effects. In addition, there is also a method in which three air
chambers are provided as the existing system so that reproduction of the entire band becomes
possible with the enhancement of the bass, but the enlargement of the cabinet can not be
avoided.
[0013]
The present invention has been made in view of such conventional problems, and in addition to
enhancing the bass, the entire cabinet can be miniaturized by the minimum necessary air
chamber, thereby enabling reproduction of all bands. A speaker system is provided.
[0014]
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Therefore, the present invention solves the above-mentioned problems by means described
below.
That is, in the invention according to claim 1, a cabinet is configured by interposing a partition
plate between the first air chamber kept sealed and the second air chamber provided with the
acoustic duct, The first speaker unit is disposed on the baffle plate provided in the first air
chamber so that the sound emission surface faces the outside of the cabinet, and the sound
emission surface faces the first or second air chamber. A second speaker unit is disposed on the
partition plate.
[0015]
In the invention of claim 2, in the invention of claim 1, the first speaker unit and the second
speaker unit are driven by the respective amplifiers via the filter circuit. And sound pressure level
characteristics in the vicinity of the crossover frequency of the second speaker unit can be
arbitrarily set.
[0016]
In the third aspect of the invention, in the invention according to the first aspect or the second
aspect, the signals inputted to the first speaker unit and the second speaker unit are arbitrarily
switched so as to be in phase or in antiphase. Make it selectable.
[0017]
In the invention according to claim 4, in the invention according to claim 1 or 2, the opening
portion of the acoustic duct provided in the second air chamber is faced to the baffle plate
provided with the first speaker unit. Make it
[0018]
According to the invention described in claim 1 of the present invention, it is possible to realize a
very small speaker system capable of reproducing the entire band with rich bass.
[0019]
According to the second aspect of the present invention, the frequency characteristics in the
vicinity of the crossover frequency of the first speaker and the second speaker can be arbitrarily
set, and adjustment of the acoustic characteristics becomes possible.
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[0020]
According to the third aspect of the invention, since the drive modes of the first speaker unit and
the second speaker unit can be switched arbitrarily and selected, it is possible to particularly
change the sound quality of the low tone range, and various reproductions can be made. You can
get a sound.
[0021]
According to the fourth aspect of the present invention, since the opening of the acoustic duct
provided in the second air chamber is made to face the baffle plate, downsizing can be facilitated.
[0022]
Hereinafter, embodiments of the present invention will be described in detail with reference to
the drawings.
[0023]
FIG. 1 shows the configuration of the first embodiment of the present invention, and in the figure,
reference numeral 1 denotes a cabinet, and shows an example in which it is formed in a
cylindrical shape as shown in FIG.
The interior of the cabinet 1 is divided by a partition plate 2 into a first air chamber 3 and a
second air chamber 4, and an acoustic duct 5 is provided in the second air chamber 4.
Then, the first speaker unit 7 is disposed on the baffle plate 6 that is the front of the cabinet 1 so
that the acoustic radiation surface faces the outside, and the opening of the acoustic duct 5 is
made to face.
[0024]
Then, the second speaker unit 8 is disposed on the partition plate 2 with the acoustic radiation
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surface facing the second air chamber 4.
In this case, in order to vibrate the diaphragms of the first speaker unit 7 and the second speaker
unit 8 in the same direction, the positive and negative connections to the amplifiers A of the first
and second speaker units 7 and 8 are The direction is reversed, so that the signals are applied in
opposite phase.
In addition, when vibrating the diaphragms of the first and second speaker units 7 and 8 in
opposite directions, as shown in FIG. 3, the positive and negative connections to the amplifier A
should be in the same direction, and the signal is Apply in phase.
[0025]
FIG. 4 is configured such that the connection shown in FIG. 1 and the connection shown in FIG. 3
can be selected, and one of the first speaker unit 7 and the second speaker unit 8 (in FIG. A
polarity switching switch SW is interposed in the connection path of the second speaker unit 8)
so that the application of the in-phase or the application of the anti-phase of the input signal can
be arbitrarily selected.
As a result, it is possible to change the overall frequency characteristics in the vicinity of the
crossover frequency of the first speaker unit 7 and the second speaker unit, and it is possible to
change the timbre of the low band part.
[0026]
In the case where the sound radiation surface of the second speaker unit 8 is made to face the
first air chamber 3 as shown in FIG. 5 for the reason of making the first air chamber 3 smaller,
etc. In order to vibrate the diaphragms of the speaker unit 7 and the second speaker unit 8 in the
same direction, the positive and negative connections to the amplifier A of the first and second
speaker units 7 and 8 are in the same direction. So that the signals are applied in phase.
In addition, in order to vibrate the diaphragms of the first and second speaker units 7 and 8 in
the opposite direction, as shown in FIG. Is applied in the reverse phase.
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[0027]
In the speaker system of the present invention configured as described above, although the first
speaker unit 7 and the second speaker unit 8 may adopt the same standard, the second speaker
unit 8 is particularly low-frequency. A speaker unit dedicated to bass reproduction with high
sound conversion efficiency can also be adopted.
In this case, in particular, reproduced sound in the middle to high range can be obtained from the
first speaker unit 7, and the reproduced sound in the low range obtained from the opening of the
acoustic duct 5 can be made powerful.
Further, by making the diaphragms of the first speaker unit 7 and the second speaker unit 8
waterproof, the ceiling of a bathroom such as a unit bus is not affected even in a wet
environment. Or it becomes a thing suitable as an embedded type speaker system to a wall.
[0028]
In the embodiment shown in FIGS. 1 and 2, the diameter of the cabinet is 96 mm, the width 84
mm of the first air chamber 3, the width 90 mm of the second air chamber 4, and the diameter
16 mm of the acoustic duct 5 in the embodiment of FIGS. , 90 mm in length, 50 mm in diameter
of the diaphragms of the first speaker unit 7 and the second speaker unit 8, and the crossover
frequency of 150 Hz, the overall sound pressure level characteristic can be made 70 Hz to 20
kHz. It became wide band and full of low range.
[0029]
FIG. 7 shows the configuration of the second embodiment of the present invention, which
includes a filter circuit F1 for attenuating a band below the crossover frequency to the common
signal source S and a filter circuit F2 for attenuating a band above the crossover frequency. It is
intended to be connected.
The signals passed through the filter circuits F1 and F2 are amplified by the amplifiers A1 and
A2, and the diaphragms of the first speaker unit 7 and the second speaker unit 8 are driven in
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the same direction.
[0030]
In such a configuration, as shown in FIG. 8, the sound pressure level characteristic P1 of the first
speaker unit 7 is made to be ?1 dB by the filter circuit F1 at the crossover frequency, and ?18
dB / oct. By setting the above, it is possible to reduce the influence of the phase interference with
the second speaker unit 8 which occurs near the crossover frequency. On the other hand, the
sound pressure level characteristic P2 obtained from the acoustic duct 5 by the second speaker
unit 8 is ?12 dB / oct. Since the sound pressure level characteristics P1 and P2 are well
connected, the frequency characteristic of this portion can be made flat. That is, since the
reproduced sound from the sound duct 5 and the reproduced sound from the speaker unit 7
have opposite phases, they work to cancel each other, but the sound pressure level characteristic
P1 of the speaker unit 7 becomes -1 dB at the crossover frequency. And -18 dB / oct. Because it
is cut off sharply, it becomes possible to obtain a natural hearing reproduction sound.
[0031]
FIG. 9 shows a configuration in which a filter circuit F1 for attenuating a band below the
crossover frequency of the common signal source S and a filter circuit F2 for attenuating a band
above the crossover frequency are connected similarly to the configuration of FIG. The signals
having passed through the filter circuits F1 and F2 are amplified by the amplifiers A1 and A2,
and the diaphragms of the first speaker unit 7 and the second speaker unit 8 are driven in the
reverse direction.
[0032]
In such a configuration, as shown in FIG. 10, the sound pressure level characteristic P1 of the
first speaker unit 7 is made to be ?3 dB by the filter circuit F1 at the crossover frequency, and
?12 dB / oct.
By setting it as this, this part can be made into the emphasized frequency characteristic of a bass.
In addition, since the diaphragms of the first and second speaker units 7 and 8 are vibrated in
opposite directions, the stiffness of the first air chamber is increased, and the bass is effectively
enhanced.
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[0033]
FIG. 11 is such that the connection shown in FIG. 7 and the connection shown in FIG. 9 can be
selected, and either one of the first speaker unit 7 and the second speaker unit 8 (in FIG. A
polarity switching switch SW is interposed in the connection path of the second speaker unit 8)
so that the application of the in-phase or the application of the anti-phase of the input signal can
be arbitrarily selected.
[0034]
As a result, it is possible to change the overall frequency characteristics in the vicinity of the
crossover frequency of the first speaker unit 7 and the second speaker unit 8, and it becomes
possible to change the timbre of the low band part.
That is, in the case of the connection shown in FIG. 7 by the polarity switching switch SW, for
example, natural aural sense of the music source can be obtained, and in the case of the
connection shown in FIG. An emphasized sound is obtained, and it is possible to reproduce a
timbre that suits taste only by operating the switch.
[0035]
As described above in detail, according to the speaker system of the present invention, since the
cabinet can be extremely miniaturized without attenuating the reproduction of the bass, as
described above, the speaker system can be mounted in a small space such as a bathroom or a
passenger car. And its scope of use is extremely extensive.
[0036]
It is a figure explaining the structure of 1st Example of this invention.
It is a front view of the speaker system of a structure of FIG. It is a figure explaining the example
of another structure of 1st Example of this invention. It is a figure which shows the evolutionary
structure of 1st Example of this invention. It is a figure explaining the modification of 1st
Example of this invention. It is a figure explaining the modification of 1st Example of this
invention. It is a figure explaining the structure of 2nd Example of this invention. It is a figure
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explaining the sound output characteristic of the speaker system of FIG. It is a figure explaining
the example of another structure of 2nd Example of this invention. It is a figure explaining the
sound output characteristic of the speaker system of FIG. It is a figure explaining the
evolutionary composition of the 2nd example of the present invention. It is a figure explaining
the speaker system of a Kelton system. It is a figure explaining the sound output characteristic of
the speaker system of FIG. It is a figure explaining the speaker system of a tandem drive system.
It is a figure explaining the speaker system used as the object of the improvement of FIG.
Explanation of sign
[0037]
1 ........ cabinet 2 ........ partition plate 3 ........ first air chamber 4 ........ second air chamber 5 ........
acoustic duct 6 ........ baffle plate 7 ........ first speaker 8 ........ second speaker a и A1 и и и и и и и и и и и и и и и
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