JP2010081316

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DESCRIPTION JP2010081316
The present invention provides a speaker system for bass, which reduces the reaction vibration
of a diaphragm which vibrates the entire cabinet or speaker system at the time of operation and
improves the bass characteristic. SOLUTION: A pair or a plurality of speaker units are
mechanically connected on the back side, and electrically connected such that the sum of vectors
of reaction vibration in operation becomes zero, thereby vibrating the entire speaker system. In
addition to reducing and installing a built-in duct cabinet or closed cabinet on the front side of
each speaker unit to attenuate middle to high range components, the ratio of the resonant
frequency of the cabinet and the duct in built-in duct type or cabinet volume in closed type The
ratio is set to 1: 1 to 1: 3, respectively, to resonate the bass region to improve bass
characteristics. [Selected figure] Figure 1
スピーカシステム
[0001]
The present invention relates to a speaker system incorporated in or combined with a television
receiver or the like to be used as a sound system having high sound quality, particularly,
excellent in the characteristic of the low frequency band.
[0002]
In the past, while the speaker system incorporated into a television receiver has been
miniaturized in accordance with the limited size of the mounting space, along with the
development of video tapes, video disks, etc., with the remarkable development of video
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technology, In recent years, higher sound quality has been required for reproduced sound.
However, the aperture of the speaker is also restricted due to dimensional limitations, and in
particular, high sound quality in the low frequency range has not been sufficiently advanced.
[0003]
In the phase-reversal type speaker system for the purpose of improving the low frequency range,
the front baffle plate of the closed cabinet is provided with an acoustic radiating means such as a
port or a duct, and part of the sound radiated to the back of the speaker unit Because it is
radiated in phase with the sound radiated to the front through the sound, the bass reproduction
range is expanded. Then, the inside of the cabinet is divided into two chambers by a partition
plate, and two speaker units are attached to the partition plate on one chamber side, and a duct is
formed in both chambers to form a double double resonance circuit acoustically. The bass
characteristic is arbitrarily set by selectively combining the resonance frequencies of the ducts.
However, in this configuration, the number of resonant systems is 2 or less, the degree of
freedom in design is small, and the range of settable characteristics is limited. Thus, a speaker
system is provided which improves these points with a relatively simple configuration. There is
an attempt (see, for example, Patent Document 1). According to this approach, the front or back
of the diaphragm of each of the plurality of speaker units is covered with a cabinet having a
predetermined volume, and the other side is covered with one common cabinet of a
predetermined volume, and these cabinets have different resonance frequencies. By providing
the duct of the present invention, a multiple resonance circuit is configured as a whole, and a
speaker system having frequency characteristics that is the sum of the acoustic output signals
radiated from all the ducts is obtained.
[0004]
In a bass reflex type speaker apparatus provided with a duct that inverts the sound radiated from
the back of the speaker unit and radiates it to the outside, there is another proposal for obtaining
high sound quality that can reproduce particularly rich bass (for example, Patent Document 2).
According to this proposal, a part of the duct is formed of a metal plate, the volume of the duct is
changed by changing its length and shape, and the resonance frequency in the low range of the
speaker box by the duct is changed. The bass characteristic can be made to be a desired
characteristic.
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[0005]
JP, 3-22797, A JP, 10-117311, A
[0006]
In the conventional speaker system of the type described above, the entire cabinet vibrates due
to the reaction of the vibration during operation of, for example, a cone-shaped diaphragm used
for a speaker unit of a relatively large aperture for emphasizing reproduction in the low
frequency range. Vibrates the entire sound system of equipment such as a television receiver that
incorporates or uses in combination to generate mechanical vibration sound different from
reproduction sound or vibrate the television receiver to shake an image Problems with image
quality degradation.
However, it is necessary to rely on mechanical suppression means to suppress this vibration, and
it is difficult to simplify the structure in that respect. In particular, in a speaker system including
a resonance system in an acoustic radiation system such as the above-mentioned phase inversion
type or bass reflex type, the vibration of the entire cabinet has a great influence on the
reproduction acoustic characteristics.
[0007]
The present invention, therefore, in a speaker system including a resonance system in an
acoustic radiation system, reduces the reaction vibration of the vibration of the diaphragm at the
time of operation of the speaker unit, suppresses the vibration of the entire speaker system, and
particularly characterizes the low frequency range. It is an object of the present invention to
provide a speaker system capable of obtaining a reproduced sound with high quality and
improved sound quality, and eliminating or simplifying means for suppressing vibration due to
reaction vibration.
[0008]
In order to achieve the above object, the speaker system according to the present invention of
claim 1 is a speaker system in which the front of a plurality of speaker units is covered with a
cabinet and the emitted sound is phase reversed and emitted to the outside. Each unit is
mechanically coupled on the back surface, and the peripheral surface of the back-coupled
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speaker unit is opened to form an acoustic radiation portion, and the cabinet is a tubular body
extending in the axial direction of the speaker unit on the front surface of each speaker unit. ,
Each cabinet comprises at least one tubular duct opening at one end at the outer end of the
cabinet and at the other end into the cabinet, the ratio of the resonant frequency for each cabinet
and duct being 1: 1 Each speaker unit is set in the range of 1: 3 Characterized in that it is
arranged and connected such that the sum of the vector is zero (0).
According to the solution of claim 2, the speaker system according to claim 1 is characterized in
that the outer end of the duct is located at the longitudinal end face of the cabinet, and the inner
end is provided opposite to the front face of the speaker unit. Do. According to the means of
claim 3, in the speaker system according to claim 1, the respective cabinets of the respective
speaker units are provided in communication with each other through the communicating
portion provided on a part of the peripheral surface of the combined body of the speaker units.
And the ducts are provided in the communication portion at right angles to the longitudinal
direction of the cabinet. According to the means of claim 4, the speaker system according to
claim 1 is characterized in that the acoustic radiation part comprises a diffuser. According to the
means of claim 5, the speaker system according to claim 1 is characterized in that the acoustic
radiation portion comprises a fixture receiving member for the fixture of the television stand
post. According to the means of claim 6, the speaker system according to claim 1 is characterized
in that the plurality of speaker units and the cabinet are arranged radially around a common
coupling member. According to the means of claim 7, in the speaker system according to claim 1,
at least two pairs of speaker units are provided in parallel, a cabinet is commonly provided on the
front of at least two adjacent speaker units, and the duct is It is characterized in that it is
disposed substantially at the center in the longitudinal direction of the common cabinet.
According to the means of claim 8, the speaker system according to any one of claims 1 to 7 is
characterized in that the speaker units are respectively coupled to each other or to the common
coupling member by an adhesive on the back side bottom surface. . According to the means of
claim 9, in the loudspeaker system according to any one of claims 1 to 7, the loudspeaker units
form a pair, and each pair is fastened and coupled by means of a screw passing through the
central axis. It is characterized by According to the means of claim 10, in the speaker system in
which the fronts of the plurality of speaker units are sealed by the cabinet and the radiated
sound is phase reversed and emitted to the outside, the plurality of speaker units are
mechanically coupled on the back surface , The peripheral surface of the back-coupled speaker
unit is opened to form an acoustic radiation part, and the cabinet is a tubular or box-like body
provided extending in the axial direction of the speaker unit on the front of each speaker unit
The volume ratio of the speaker units is set in the range of 1: 1 to 1: 3, and each speaker unit is
arranged and connected such that the sum of the vectors of the respective reaction vibrations is
zero (0).
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[0009]
The mechanical connection of at least one pair of speaker units to each other on the back side,
the front side of each is covered with a closed cabinet, and a duct is provided in the cabinet to
open the cabinet at one end of the duct. Set the resonance frequency ratio in the range of 1: 1 to
1: 3, and set the volume ratio of each cabinet in the range of 1: 1 to 1: 3 when making the
cabinet a closed type without providing a duct By this, the bass characteristic is improved.
Furthermore, by arranging and connecting each speaker unit so that the sum of the vectors of
the respective reaction vibrations becomes zero, it is possible to cancel the vibration generated
from the speaker unit, and the improved bass characteristic is the vibration. It is exhibited
without being affected.
[0010]
Several preferred embodiments of the loudspeaker system according to the invention are shown
in FIGS. 1 to 9 and are described below.
[0011]
FIG. 1 is a longitudinal sectional view showing a first embodiment of the basic configuration of
the speaker system according to the present invention, in which the back sides, that is, the
bottom surfaces of the magnetic circuits are in contact with each other at the center to align
central axes A pair of speaker units 1a and 1b coupled to each other are disposed, and both sides
thereof are hollow cylindrical cabinets 2a and 2b whose front ends 1c and 1d, that is, the
diaphragm outer surface side of each speaker unit are closed and outer ends are closed. Cover
with each.
For the connection between the speaker units 1a and 1b, it is desirable to use an adhesive
applied to the bottom of each magnetic circuit or a fastening method using a screw such as a
screw or a bolt and a nut through which the central axes of both units penetrate.
[0012]
In the pair of speaker units 1a and 1b coupled on the back side, that is, oppositely coupled to
each other, the sum of the vectors of the vibration of the speaker units due to the reaction
reaction becomes zero (0), and the operations cancel each other It is connected so that it
becomes, and generation ¦ occurrence ¦ production of the vibration of the whole cabinet by
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reaction reaction of the vibration of a diaphragm is suppressed by it.
[0013]
Furthermore, in order to improve the low range characteristic of the speaker system, the front
sides 1c and 1d on the diaphragm outer surface side of the pair of speaker units 1a and 1b
coupled in the opposite directions as described above are respectively outward. The open inner
end of the closed cylindrical cabinet 2a, 2b is attached to seal the front side 1c, 1d of the speaker
unit.
As a result, the middle-high range component is attenuated inside the cabinets 2a and 2b. For the
low frequency range, hollow tubular ducts 4a and 4b each having a smaller diameter than the
cabinet are opened at the outer end of the cabinet at one end 4c and 4e, and the other end 4d,
inside the tubular cabinets 2a and 2b. It is installed to open toward the speaker unit front face
1c, 1d at 4f, and the ratio of the resonance frequency calculated for the cabinet and the duct is
set mainly in the range of 1: 1 to 1: 3, and the radiation is mainly from the duct It is possible to
make the low frequency range to be a high-quality resonance sound with little distortion. The
following formula is used to calculate the resonant frequency fb of the duct. fb = √ ((30000 × S)
/ (V × (L + 0.825√ (S)))) where S is the area of the duct (cm <2>), V is the volume of the cabinet
(lit.), L is the Represents the length of the duct (cm).
[0014]
The periphery of the combined body of the speaker units 1a and 1b is opened to constitute the
acoustic radiation unit 3, the middle to high range component radiated to the front of the
speaker unit is attenuated in both cabinets, and the low range component resonated with the
duct is a duct The entire range component emitted from the open end but coming out to the back
side resonates at the acoustic radiation portion 3 and is emitted.
[0015]
FIG. 9 shows the characteristics of the reaction vibration generated from the rear surface coupled
speaker unit measured at the longitudinally intermediate position of both cabinets 2a and 2b of
the speaker system of the present invention according to the first embodiment of FIG. As a result
of sweeping 500 Hz, the amplitude value at the measurement position was almost zero over the
entire period.
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On the other hand, the same vibration characteristic of FIG. 10 measured at the outer periphery
of the speaker unit on the opposite side of the duct of the conventional speaker system
consisting of a single speaker unit and a duct extending orthogonally to its axis is already 20 Hz.
It shows remarkable amplitude values. 11 and 12 show frequency characteristic curves in the full
frequency range of the loudspeaker system of Example 1 according to the present invention of
FIG. 9 and the conventional loudspeaker system used for the measurement of FIG. Thus,
according to the invention, the improvement in the bass range and the attenuation in the middle
and high range are apparent.
[0016]
FIG. 2 shows a speaker system in the second embodiment according to the present invention, but
the difference in construction from the first embodiment is that each of the cabinets 2a, 2b does
not have the ducts 4a, 4b and therefore any cabinet has an outward end In a sealed manner. In
this case, by setting the volume ratio of the pair of speaker units 1a and b in the range of 1: 1 to
1: 3, the middle to high range component is attenuated in the closed cabinet, but the low range
component is both cabinets. It resonates inside and is emitted from the acoustic radiation unit 3
together with the back side radiation sound.
[0017]
FIG. 3 shows another embodiment of the speaker system of the second embodiment. Here, the
duct 4b of the first embodiment is provided in one cabinet 2b and the outer end is opened, but
the other cabinet 2a is kept sealed. The volume ratio of the second embodiment is applied to the
closed cabinet 2a, and the resonance frequency ratio of the first embodiment is applied to the
open-ducted cabinet 2b.
[0018]
FIG. 4 shows a speaker system according to a third embodiment of the present invention, in
which the diameter or the width of the independent cabinets 2a and 2b shown in the first and
second embodiments are enlarged and the speaker units 1a and 1b are centrally located on the
back surface. Two cabinets 2d and 2e are connected to one by communication part 2c provided
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in the side. Here, a duct 4g extending in a direction perpendicular to the axis of the speaker units
1a and 1b is provided in the communication portion 2c, and the communication space in the
cabinets 2d and 2e is unsealed via the duct 4g. Therefore, although the resonance frequency
ratio of the first embodiment is applied, the volume ratio of the second embodiment may be
applied by providing a closed type without providing the duct.
[0019]
FIG. 5 shows an embodiment which can be commonly applied to Examples 1 and 2 and, if
desired, to Example 3, and the speaker system of the present invention is a side view of a central
speaker unit combination. By providing a diffuser 5 consisting of a reflector 5a attached to the
back of the speaker unit assembly and a diffusion cone 5b attached to the opposite side to diffuse
the sound from the reflector and the radiation sound. Give direction to sound and improve sound
characteristics.
[0020]
FIG. 6 shows an embodiment which can be applied to Examples 1 and 2, and the speaker system
of the present invention receives the corresponding portion of the fixture 8 provided in the pillar
portion of the television stand 7 of the television receiver using it in combination. The fixture
receiving member 6 is provided.
Therefore, the speaker system of the present invention can be easily attached to and used at the
lower front of the television receiver.
[0021]
In the loudspeaker system of the fourth embodiment according to the present invention shown in
FIG. 7, the back surfaces of the three loudspeaker units 1e to 1g are adhesively fixed to the
respective surfaces of a common coupling member 9 having a regular triangular cross section.
The open ends of three cabinets 2f to 2h similar to those of the first embodiment are attached to
the front surface of each speaker unit, and are arranged radially at equal intervals. This radial
arrangement can be made up of a plurality of desired speaker units and a cabinet by using a
common coupling member 9 having a regular polygonal cross section with a desired number of
angles. It goes without saying that the connection described in the first embodiment for vibration
cancellation of the speaker unit due to the reaction and the resonance frequency ratio or volume
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ratio for improving the bass characteristic are applied.
[0022]
In the fifth embodiment of FIG. 8, a plurality of pairs of back coupled speaker units and cabinets
mounted on the front thereof are arranged in parallel. In the figure, two pairs of back-coupled
speaker units 1h, 1i and 1j, 1k are mutually juxtaposed side by side, and cabinets 2i, 2j
communicating respectively with two fronts of respective sides of the two sided speaker units are
provided. It is attached. If desired, these cabinets may be either ducted or non-ducted enclosed,
however, the desired setting of the resonant frequency ratio or volume ratio and wiring for
reaction vibration cancellation are performed accordingly.
[0023]
BRIEF DESCRIPTION OF THE DRAWINGS The longitudinal cross-sectional view of the speaker
system by Example 1 of this invention. The longitudinal cross-sectional view of the speaker
system by Example 2 of this invention. BRIEF DESCRIPTION OF THE DRAWINGS The longitudinal
cross-sectional view of the speaker system of embodiment common to Example 1 and 2. FIG. The
longitudinal cross-sectional view of the speaker system by Example 3 of this invention. The
longitudinal cross-sectional view of the speaker system of embodiment which can be applied to
Examples 1-3. The longitudinal cross-sectional view of the speaker system of Example 1 of the
state attached to the television stand pillar part. The longitudinal cross-sectional view of the
speaker system by Example 4 of this invention. The longitudinal cross-sectional view of the
speaker system by Example 5 of this invention. FIG. 6 is a reaction vibration characteristic
diagram of a low frequency range by the speaker system of Example 1; The reaction vibration
characteristic figure of the low frequency range by the speaker system of a prior art example.
FIG. 8 is a frequency characteristic diagram of the entire frequency range by the speaker system
of Example 1; The frequency characteristic figure of the full frequency range by the speaker
system of a prior art example.
Explanation of sign
[0024]
1a to 1k Speaker unit 2a to 2j Cabinet 3 Acoustic radiation unit 4a to 4g Duct 5 Diffuser 5a
Reflector 5b Diffusion cone 6 Fixture receiving member 7 TV stand 8 Attachment 9 Coupling
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member
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