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JP2002291085

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DESCRIPTION JP2002291085
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker apparatus for faithfully reproducing signals of complex waveforms such as musical
tones.
[0002]
2. Description of the Related Art A conventional cylindrical housing type speaker device has a
structure in which a single cylindrical housing is erected vertically and a speaker unit is mounted
at the upper opening end, and it is non-directional around the speaker device. The generated
signal can be emitted. The speaker unit has a full range speaker unit or a two-way speaker unit
(having a structure in which a high sound speaker unit is disposed substantially coaxially in a
state of being surrounded by a diaphragm of a bass speaker unit. Is used to reproduce an
acoustic signal of about 20 Hz to 20 kHz, which is said to be the human audible band, but a
problem that may occur in this case occurs in a bass band of about 200 Hz or less. The problems
are summarized in the following two points. (1) Lack of a sense of volume due to the decrease in
sound pressure of the bass part. (2) Qualitative deterioration of the reproduced sound that occurs
when an acoustic signal in the low frequency range from the frequency where the length of the
cylindrical casing is 1⁄4 wavelength is reproduced.
[0003]
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1
In the cylindrical housing type speaker device of the prior art, the length of the cylindrical
housing can not but be restricted in order to prevent the lowering of the high sense of hearing
level, and the long one is suppressed to about 1 m. For example, when the length of the
cylindrical casing is 1 m, the frequency of 1 m at 1⁄4 wavelength is 86 Hz.
[0004]
Here, the sound waves emitted from the rear surface of the speaker unit propagate in the
cylindrical housing in the downward direction in the air-tight state. If the sound wave is lower
than 86 Hz, it is not possible to fit all of the air tightness states constituting the sound wave in a
cylindrical housing having a length of 1 m. This means that it is theoretically impossible to
reproduce an acoustic signal lower than 86 Hz with a 1 m cylindrical housing in a satisfactory
state. Furthermore, this phenomenon becomes more pronounced as the reproduction frequency
is lower.
[0005]
The above-mentioned problems in the low frequency range do not occur in a cylindrical case of
infinite length. However, in a standing cylindrical housing type speaker device, when the sound
radiated upward is dispersed and emitted in a non-directional manner in a horizontal direction, a
cylindrical housing having a length of around 1 m can not be used in practice. The problem in
the low range could not be solved fundamentally because
[0006]
In order to satisfactorily reproduce the bass contained in program sources such as CDs and
DVDs, it is necessary to be able to reproduce an acoustic signal of at least around 40 Hz. In order
to reproduce the 40 Hz acoustic signal, a cylindrical housing having a length of 1⁄4 of the 40 Hz
wavelength, that is, the following equation (344 m ÷ 40) ÷ 4 = 2.15 m is required. However,
when using this length vertically, the position of the speaker unit will be high, and even when the
user stands up and listens to sound, a problem occurs that the audibility level in the high range is
greatly reduced. Furthermore, this phenomenon becomes more pronounced as the frequency
increases.
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2
[0007]
For example, although it is conceivable to cope with a method in which the cylindrical casing is
bent at an intermediate point to cope with the problem, the characteristic of the high region
having a short wavelength is deteriorated by the bending, and reproduction with high fidelity
becomes difficult.
[0008]
The present invention relates to a cylindrical housing type speaker for faithfully reproducing a
complex waveform signal such as a musical tone, and as prior examples of the same purpose,
Japanese Patent Application Laid-Open Nos. 5-56493, 5-145983 and Japanese Patent
Application No. 11 No. -343026 etc., but all have had problems in terms of quantity and quality
regarding the reproduction of bass.
[0009]
It is an object of the present invention to provide a speaker device capable of solving the
contradictory problem of high and low tone areas caused due to the length of a cylindrical casing
and faithfully reproducing the acoustic signal of the auditory sense area. It is in.
[0010]
The speaker apparatus according to the first aspect of the present invention comprises a first
tubular housing having a low-pitched speaker unit at one end and a folded shape, and a highsound speaker unit at one end. A speaker device comprising: supporting means for supporting at
least one of the provided second cylindrical casings so as to stand in a substantially vertical
direction, the high-sound speaker unit and the high-sound speaker unit The upper limit Fmax of
the crossover frequency F of the bass speaker unit is set to a frequency lower than the frequency
at which 1⁄4 of the distance connecting the center of the treble speaker unit and the center of the
bass speaker unit is a wavelength The crossover frequency F is set to a frequency which is equal
to or less than the upper limit Fmax and substantially in the vicinity thereof.
[0011]
The speaker device according to the second aspect of the present invention has at least one
tubular shape including a low-pitched speaker unit at one end and a first cylindrical casing
having a folded shape and a high-sound speaker unit at one end. A speaker device for supporting
the second cylindrical casing together so as to stand in a substantially vertical direction, which is
a crossover of the high sound speaker unit and the low sound speaker unit. The lower limit Fmin
of the frequency F is set to a frequency that is one octave higher than the frequency where the
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3
wavelength of the second cylinder casing is a wavelength, and the upper limit Fmax of the
crossover frequency F is the center of the high sound speaker unit And the crossover frequency F
is set to a frequency lower than the frequency having a wavelength of 1⁄4 of the distance
connecting the center of the bass speaker unit and the center of the bass speaker unit. And is a
limited value Fmin above is characterized in that set below the upper limit value Fmax.
[0012]
Preferably, the above speaker device further includes an extension cylinder connected to the
other end of the first cylindrical casing and extending the length of the first cylindrical casing.
[0013]
Further, in the above speaker device, preferably, the speaker device further includes an
adjustment cylinder which is connected to the first extension cylinder and extends the length of
the first cylinder casing and the first extension cylinder in an adjustable manner. It is
characterized by
[0014]
Furthermore, preferably, the first cylindrical casing has a U-shaped cylindrical shape, and the
second cylindrical casing has a straight cylindrical shape.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be
described below with reference to the drawings.
[0016]
<First Embodiment> FIG. 1 is a perspective view showing the appearance of a two-way cylindrical
housing type speaker device according to a first embodiment of the present invention.
2 (a) is a front view of the two-way cylindrical housing type speaker device of FIG. 1 as viewed
from the front side 201, and FIG. 2 (b) is a plan view of the device as viewed from above.
Furthermore, FIG. 3 is a side view of the two-way cylindrical housing type speaker device of FIG.
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1 as viewed from the side 202.
The two-way cylindrical housing-type speaker device according to the first embodiment includes
(a) a U-shaped cylindrical cylindrical housing 1a having a bass speaker unit 2a, and (b) a highsound speaker unit 2b. (C) A linear cylindrical cylindrical casing 1c provided with a high sound
speaker unit 2c, and both of these cylindrical casings 1a, 1b and 1c are substantially
perpendicular to each other. The speaker device includes the support member 15 and the
speaker base 14 supported so as to stand upright, and (A) the upper limit Fmax of the crossover
frequency F of the high sound speaker units 2b and 2c and the low sound speaker unit 2a.
Setting the frequency lower than the frequency having a wavelength of 1⁄4 of the distance
connecting the center of the high-sound speaker unit and the center of the low-sound speaker
unit; The over frequency F is set to a frequency substantially equal to or lower than the upper
limit Fmax or (B) the lower limit Fmin of the crossover frequency F of the high sound speaker
units 2b and 2c and the low sound speaker unit 2a. The upper limit Fmax of the crossover
frequency F is set to the center of the high-tone speaker units 2b and 2c, and the low-frequency
speaker unit, with the length of each cylindrical body 1b and 1c set to a frequency one octave
higher than the frequency. It is characterized in that 1⁄4 of the distance connecting to the center
of 2a is set to a frequency lower than the frequency as a wavelength, and the crossover
frequency F is set to not less than the lower limit Fmin and not more than the upper limit Fmax.
There is.
[0017]
In the embodiment according to the present invention, in order to solve the above-mentioned
trade-off problem, so-called two-way speaker units 2b and 2c and bass unit 2a are different
cylindrical housings 1b, 1c and 1a, respectively. Although the system is used, the existing twoway speaker system has a fatal defect that impedes high fidelity reproduction as described below.
[0018]
In the existing two-way speaker device, the crossover frequency F is set to a high band of 2,000
Hz to several thousand Hz, and the average wavelength of the band is extremely short such as
about 10 cm.
In addition, the distance between the center of each of the high-pitched speaker units 2b and 2c
and the center of the low-pitched speaker unit 2a is often 10 cm or more, and the length is
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5
substantially the same as the average wavelength. ing.
For this reason, the sound waves emitted from both the high-pitched and low-pitched speaker
units 2b, 2c and 2a will be synthesized in the air space with considerably different phases, and
the correct sound wave signal can be reproduced. Can not.
[0019]
The embodiment according to the present invention has an excellent characteristic possessed by
the cylindrical housing type speaker device, that is, when the high sound cylindrical housings 1b
and 1c have a length enough to accommodate the air tightness of the sound waves. In the
playback area whose length is higher than the frequency corresponding to 1⁄4 wavelength, other
systems are surpassed in naturalness of the playback sound, and further, it is practical that the
high sound cylindrical housings 1b and 1c are around 80 cm. It pays attention to the point that it
is possible to reproduce even a high-quality mid-bass region even at a long length.
[0020]
Based on this finding, the lower limit value of the frequency handled by the high-tone speaker
units 2b and 2c is lowered to the mid-bass range of 400 Hz to 200 Hz, to about 1/10 of the
average crossover frequency of the existing 2-way speaker Thus, it is possible to extremely
reduce the phase difference between the sound wave signals emitted from the two speaker units
2b, 2c and 2a.
Therefore, an object of the embodiment according to the present invention is to provide an ideal
two-way type speaker device utilizing the features of the cylindrical housing type speaker.
[0021]
The lower limit value of the crossover frequency F of the high-pitched speaker units 2b and 2c
and the low-pitched speaker unit 2c is a frequency at which the quadruple length of the highpitched cylindrical casings 1b and 1c corresponds to one wavelength (cylindrical casing 1b , 1c)
is set to a frequency that is preferably one octave or more higher than the limit frequency that
can accommodate all of the sparse and dense states of the sound wave.
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As a result, it is possible to suppress the decrease in sound pressure of the acoustic signal in the
lower limit region of the frequency handled by the high-tone speaker units 2b and 2c, and to
maintain the fidelity of the acoustic signal waveform in the lower limit region.
[0022]
For example, when the length of the high-sound cylindrical housings 1b and 1c is 70 cm, the
lower limit Fmin of the crossover frequency F is expressed by the following equation, assuming
that the speed of sound in the air is 34,400 cm.
Fmin = 34,400 / (70 × 4) = 122.9 Hz
[0023]
More preferably, the lower limit Fmin of the crossover frequency F is a double harmonic of the
above lower limit Fmin, and the frequency thereof is expressed by the following equation.
Fmin = 122.9 × 2 = 245.8 Hz
[0024]
On the other hand, the upper limit value Fmax of the crossover frequency F is set to a frequency
at which four times the distance connecting the center points (of the diaphragm) of the low and
high tone speaker units 2a and 2b and 2c is one wavelength.
Thereby, the phase difference of the sound waves emitted from both the speaker units 2a and 2b,
2c can be kept within 90 degrees, and the decrease in fidelity generated by the sound wave
synthesis can be suppressed.
[0025]
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For example, when the distance connecting the center points (of the diaphragm) of the low and
high tone speaker units 2a and 2b and 2c is 25 cm, the upper limit Fmax of the crossover
frequency F is expressed by the following equation.
Fmax=34400÷(25×4)=344Hz
[0026]
When the crossover frequency F is set to a value close to the upper limit Fmax, the low-frequency
reproduction characteristic in the frequency domain of the high-pitched speaker units 2b and 2c
is improved, but on the other hand the position of the sound waves emitted by both speaker units
2a and 2b and 2c. The phase difference increases and the fidelity decreases. Therefore, the
crossover frequency F should be set to a value that facilitates selection of each element of the
inductance and capacitance of the signal distribution network 110 shown in FIG. 5 among the
latest frequencies (integers) not falling below the lower limit Fmin described above. Is desirable.
[0027]
In this example, the desired crossover frequency F lies between 245.8 and 344 Hz and does not
fall below 245.8 Hz. Preferably, it is set to 250 Hz, which is easy to select an element from the
nearest frequencies (integer), that is, 246, 247, 248, 249, 250 Hz.
[0028]
In the embodiment according to the present invention, in the signal distribution network 110, an
LC type of 12 dB / octave is used, and both high bass speaker units 2a, 2b and 2c are connected
in reverse phase and used. As a result, both speaker units 2a, 2b and 2c are driven in a state
close to the same phase.
[0029]
For example, when an electrical signal of 122.9 Hz is supplied to the high-tone speaker unit 2b,
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2c via the signal distribution network 110 of crossover frequency F = 250 Hz and cutoff
characteristic = 12 dB / octave, the level is that of the flat portion Since the level can be
suppressed to -12 dB or less, the disturbance of the sound wave in the vicinity of the crossover
frequency F in the lower part (eg, 70 cm in length) of the cylindrical housings 1b and 1c is
suppressed, and the fidelity of the reproduction signal waveform is enhanced. Can.
[0030]
Thus, the crossover frequency F is 1/10 to 1/20 of that of a general 2-way speaker by making
the high sound portion of the 2-way speaker into a cylindrical casing structure and lengthening
the length (for example, 70 cm). (E.g. 250 Hz).
For example, one wavelength of 250 Hz is 137.6 cm, and this length is sufficiently longer than
the physical distance (25 cm) between the high-pitched speaker units 2b and 2c and the lowpitched speaker unit 2a. It is possible to reduce the phase difference of the sound wave signals
emitted from both high and low level speakers, which is a problem in the two-way speaker
system, and to reduce the waveform distortion of the sound wave signal near the crossover
frequency F.
[0031]
Furthermore, if the length of the cylindrical housings 1b and 1c of the high-tone speaker units 2b
and 2c is set to 100 cm close to the practical limit, the crossover frequency F can be 175 Hz,
which is about one octave of 86 Hz. The effects shown in the present invention can be made
more remarkable.
[0032]
As described above, since the wavelength of the crossover frequency F (for example, F = 250 Hz)
is long, the high-pitched speaker units 2b and 2c are spaced downward (25 cm in the example)
from the position of the bass speaker unit 2a. As a result, the influence of the sound pressure
emitted from the bass speaker unit 2a on the high-tone speaker units 2b and 2c can be reduced.
Thereby, the fidelity of the sound emitted from the high sound speaker units 2b and 2c can be
enhanced.
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[0033]
The low frequency speaker unit 2a handles a so-called medium low frequency region or lower (in
the embodiment, 250 Hz or less), so the wavelength handled is long, and in the embodiment, it is
137.6 cm or more. For this reason, it is possible to suppress the deterioration of the sound
quality due to the influence of the uneven state inside the wall surface of the cylindrical casing
1a or the bending of the cylindrical casing 1a (disturbance due to reflection, refraction, etc.).
Since the cylindrical casing 1a can be bent in a U-shape utilizing this characteristic, it is possible
to secure a sufficient length necessary for bass reproduction while keeping the speaker unit 2a at
a low position.
[0034]
The low-pitch cylindrical casing 1a is bent in a U-shape for the above reason, and is referred to as
one end (hereinafter referred to as an A end portion). ) And the other open end (hereinafter
referred to as the Z end). ) By making the cross-sectional area of the tip opening 13a at the Z end
about half of the total base area of the cylinder bottom 12a, the value obtained by calculating the
reproduction threshold frequency of the bass from the cylinder length It can be lower.
[0035]
The cylindrical speaker device according to the present invention is different from the
conventional method in which the lower open end of a single cylindrical housing is installed
several mm away from the installation surface, and a thick U-shaped tube for bass is used. Since
the lowermost part is firmly fixed to the installation stand having a wide ground surface and high
stability, the fall stability of the entire device is extremely high. Therefore, sufficient stability can
be ensured even if several kilograms of heavy objects other than the speaker units 2a, 2b and 2c
are added to the upper part of the cylindrical casings 1a, 1b and 1c. By taking advantage of this
feature, lumps of around several kilograms are fixed to the back of the magnets of the speaker
units 2a, 2b, 2c, and the fidelity of the reproduced sound can be enhanced by absorbing the
vibrations of the speaker units 2a, 2b, 2c. . The massive weight is commercially available under
the trade name of dead mass, but it may be a nonmagnetic heavy material having a short length
and a heavy weight.
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[0036]
Hereinafter, with reference to the drawings, an embodiment according to the first embodiment
will be described.
[0037]
Referring to FIGS. 1 to 3, the U-shaped cylindrical housing 1a is supported by press-fitting into
two circular holes 14a and 14b formed on the upper surface 14t of the speaker base 14, and the
cylindrical housing 1a is The folded back portion 11 a is accommodated in the skirt of the frustoconical speaker base 14 so as not to be visible.
A plurality of rubber feet 14g are attached to the bottom surface of the speaker base 14, and the
speaker base 14 is fixed so as not to slide. Here, the high sound speaker unit 2a is attached to the
A end of the cylindrical housing 1a, and the Z end of the other end has an area of 1⁄2 of the
entire bottom surface of the cylindrical bottom surface 12a and has a diameter R A circular tip
end opening 13a is formed. The Z end portion is shaped to be positioned higher than the A end
portion.
[0038]
The two high-pitch cylindrical housings 1b and 1c are positioned to have a cylindrical center on a
bisector perpendicular to a line connecting the centers of the U-shaped cylindrical housings 1a
and 1a, and The upper end of the low-pitch cylindrical casing 1b, 1c is lower than the A-end of
the cylindrical casing 1a, and the lower end of the low-pitch cylindrical casing 1b, 1c is higher
than the upper surface 14t of the speaker base 14 It is positioned at Here, the high sound
speaker units 2b and 2c are attached to the upper end portions of the cylindrical casings 1b and
1c, respectively, while the lower end portions of the cylindrical casings 1b and 1c are entirely
open. The bodies 1b and 1c are both supported in the vertical direction, which is the vertical
direction, by the cylindrical casings 1a and 1a fixed to the speaker base 14 using the support
member 15.
[0039]
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11
As the material of the cylindrical casings 1a, 1b, 1c, acryl, paper (hard), etc., whose internal loss
is larger than metals such as aluminum and copper are preferable, but if a damping material etc.
is attached to the inner surface, metal May be. However, it may be accompanied by some metalspecific sound. Further, the inside of the bass cylindrical housing 1a is preferably filled with a
sound absorbing material.
[0040]
FIG. 4 is a cross-sectional view showing the vicinity of the attachment of the speaker unit 2a of
the two-way cylindrical housing type speaker device of FIG. In FIG. 4, the speaker unit 2 a is
configured to include a front frame 9, a speaker frame 3, a diaphragm 4, a magnet 5, and a
weight 6. As shown in FIG. 4, it is integrally molded with the cylindrical case 1 a so as to project
slightly inward from the inner periphery of the cylindrical case 1 a at a position slightly inward
of the A end of the cylindrical case 1 a. A plurality of edge portions of the front frame 9 are
placed on the inner surface projecting ring 8 formed by the above through the ring seat-shaped
damping sheet 7, and a plurality of damping washers (not shown). The speaker unit 2a is fixed in
the cylindrical housing 1a by using the vibration control screw 10). The magnet 5 and the weight
6 are fixed to the rear of the diaphragm 4 of the speaker unit 2a. As the damping sheet 7, a 5
mm thick solvocein (trade name) is suitable, but any other damping sheet may be used as long as
it has the same performance. Further, as the damping screw 10 and the damping washer, it is
preferable to use a manganese alloy (M2052 type: commonly called black metal) as a material.
However, if it is not available, it may be a normal metal material.
[0041]
In the speaker unit 2a, the diaphragm 4 is vibrated by electromechanical conversion of the low
frequency signal in response to the low frequency signal, and a sound wave is generated and
emitted from the front surface of the diaphragm 4. A voice coil not shown in FIG. 4 is disposed in
the gap between the yoke and the plate, and when a low frequency signal is applied to the voice
coil, the voice coil vibrates according to the low frequency signal due to the magnetic flux of the
gap. The voice coil is mechanically connected to the diaphragm, and the diaphragm 4 vibrates
according to the vibration of the voice coil, and the sound wave corresponding to the low
frequency signal is mainly radiated from the front surface of the diaphragm 4 in the upper
direction in the figure. Be done.
[0042]
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12
Although FIG. 4 illustrates a method of mounting the low-frequency speaker unit 2a, the hightone speaker units 2b and 2c are also mounted in a similar manner.
[0043]
FIG. 5 is a circuit diagram showing an electric circuit used for the two-way cylindrical housing
type speaker device of FIG.
In FIG. 5, an audio signal input to a pair of input terminals is amplified by the power amplifier
100 and then output to the three speaker units 2a, 2b and 2c via the signal distribution network
110. Here, the signal distribution network 110 is composed of a low pass filter 111 and a high
pass filter 112, where the low pass filter 111 is an L type low pass composed of an inductance
L1 and a capacitance C1. It is a filter. On the other hand, the high pass filter 112 is an L type
high pass filter including a capacitor C2 and an inductance L2, and further includes an
impedance holding type attenuator ATT and impedance matching resistors R1 and R2. The
output terminal of the power amplifier 100 is connected to the bass speaker unit 2 a via the low
pass filter 111, and is connected to the two high tone speaker units 2 b and 2 c via the high pass
filter 112.
[0044]
The speaker device system according to the embodiment configured as described above is
actually designed and prototyped for a church or a hall, and it is from powerful bass with
sufficiently low bass to clear and delicate treble. Regeneration can be provided at an
unprecedented high level of quality as described above.
[0045]
Taking the example (prototype) according to this embodiment as an example, since the length of
the high-tone cylindrical casing 1b is 70 cm, the frequency at which this length is 1⁄4 wavelength
is 122.9 Hz. The preferred crossover frequency F in that case is 250 Hz as described above.
[0046]
In this embodiment, since LC network with a crossover frequency of 250 Hz and 12 dB / octave
is used for the signal distribution network 110, the sound pressure of 122.9 Hz at the lower
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13
openings 13b and 13c of the high-tone cylindrical housings 2b and 2c. The level is about 12 dB
lower than the sound pressure of the flat portion, for example, the sound pressure of 5000 Hz.
Thereby, the disturbance of the sound wave in the vicinity of 250 Hz in the lower openings 13 b
and 13 c can be suppressed.
[0047]
In the embodiment, the high-tone speaker units 2b and 2c are disposed symmetrically in the leftright direction centering on the bass speaker unit 2a.
As described above, by driving the two high-pitched speaker units 2b and 2c in parallel, it is
possible to obtain strong power and form a virtual coaxial with the low-pitched speaker unit 2a.
However, when the power may be small depending on the application, the high-tone speaker
units 2b and 2c may be one.
[0048]
Since the low-pitched cylindrical housing 1a of the embodiment has a length of 260 cm, all of the
air density states forming a sound wave of 260 cm as a 1/4 wavelength, that is, 33 Hz, are
simultaneously stored in the cylindrical housing 1a. Can be housed in This enables rich bass
reproduction up to the ultra low range.
[0049]
The wavelength of the sound wave received by this low-pitched speaker unit 1a is 137.6 to 1042
cm (corresponding frequency 250 to 33 Hz), compared with the uneven state inside the wall
surface of the cylindrical housing 1a and the curved surface change degree of the folded portion
11a. Since it has a sufficient length, the disturbance due to the reflection and refraction of the
sound wave can be suppressed to a practically negligible level.
[0050]
Position the Z end of the low-pitch cylindrical housing 1a to be about 20 to 30% higher than the
cylindrical housing length on the A end, attach the cylindrical bottom 12a that is a closed plate to
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14
the tip opening 13a, and center it A circular hole is formed in the part, and the cross-sectional
area thereof is preferably set to about half of the total cross-sectional area of the bottom, but
more preferably, it is optimum while looking at the frequency characteristics of the bass region
To set.
[0051]
With regard to the speaker device according to the present embodiment configured as described
above, particularly, bass reproduction will be described.
The cylindrical casing 1a has a U-shape, and the bass speaker unit 2a is attached to the A end,
and the casing length on the Z end is set 20 to 30% higher than the A end, and the Z end is A
cylindrical bottom surface 12a, which is a closing plate, is attached, and a tip end opening 13a is
formed in the center thereof.
In the above-described embodiment (prototype), the cross-sectional area of the tip opening 13a is
1⁄2 of the cross-sectional area of the housing. In this state, when the relationship between the
sound waves at the top of the speaker unit 2a and at the top of the tip opening 13a at the Z end
is considered, the two are basically in reverse phase. Therefore, if the sound pressures of the two
are equal, they cancel each other and the sound waves disappear. However, the embodiment has
the following features.
[0052]
(A) The length 260 cm of the cylindrical casing 1 a resonates at a frequency of 33 Hz
corresponding to a 1⁄4 wavelength, the reproduction sound pressure increases, and resonance
occurs at frequencies 99, 165, and 231 of 33 Hz odd multiples. (B) Since the length of the
cylindrical case 1a is 260 cm, a phase difference occurs between both sound waves. (C) Sound
energy is reduced because the sound absorbing material is filled in the cylindrical housing 1a
over the entire length. (D) Since the cross-sectional area of the tip end opening 13a at the Z end
is narrowed to 1⁄2, it has both closed and open-tube characteristics.
[0053]
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15
Due to the above features, the bass is reproduced with the following tendency. (A) Due to both
closed and open tube characteristics, the phenomenon that occurs is weaker than in the case of
one character. (B) In the case of a closed tube, the lowest resonance frequency is 66 Hz, and
since the resonance point can be formed even at an even multiple of 132 Hz, the total number of
resonance points increases. (C) The lowest resonance frequency of 33 Hz is strong because it is
similar to the lowest frequency Fo of the bass speaker unit 2a, and a super bass feeling is
produced. (D) There are five other resonance points up to the crossover frequency F, and the
head according to the above (A) and the absorption by the sound absorbing material suppress
the head, and the flatness of the frequency characteristic appears. (E) In the tube resonance, as
the magnification increases from the basic resonance frequency, the resonance phenomenon
becomes weaker, so that flatness is further obtained in the upper limit region of the low region.
[0054]
In this embodiment, most of the conventional speaker devices radiate the reproduced sound
toward the front of the speaker device, and although there are some radiating backwards, the
sound produced by live musical instruments and orchestras It is determined that the lack of a
sense of presence and the lack of a sense of naturalness due to the absence of strong radiation of
sound waves in all directions such as and above, and the like are the most important cause
preventing reproduction of live performance atmosphere. Furthermore, the present invention
provides a speaker device capable of expanding a high fidelity reproduction over the entire
audible band including super low tones, which has been lacking in the conventional similar
system, in front of the eye in how to make real sound and the appearance of sound. be able to.
[0055]
As described above, according to the present embodiment, it is possible to solve the trade-off
problem of the high range and the low range that occurs due to the length of the cylindrical
casing, and faithfully reproduce the acoustic signal of the audibility area It is possible to provide
a speaker device that can
[0056]
<Second Embodiment> FIG. 6 is a side view showing the structure of a two-way cylindrical
housing type speaker device according to a second embodiment of the present invention, and the
same ones as in FIGS. The code is attached.
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16
The second embodiment is characterized by further including an extension cylindrical tube 20
and an adjustment cylindrical tube 21 as compared to the first embodiment.
If it is necessary to further extend the lower limit of the low frequency reproduction frequency,
as shown in FIG. 6, downward from the tip opening 13a which is a throttling hole at the Z end
through the extension cylindrical pipe 20 which is an inverted U-shaped pipe. This can be
realized by extending the oriented cylinder (in the range of the lower open end to a height of
about 20 cm or more from the installation surface). Balance of weight is adjusted so that the
bottom of the modified U-shaped cylindrical case whose one end is longer than the other end of
the structure becomes the center of gravity, and that part is fixedly installed on the cradle to
suppress vibration absorption of the entire speaker device The effect can be enhanced.
[0057]
In FIG. 6, a U-shaped extended cylindrical tube 20 having the same cross-sectional area as the tip
opening 13a and the adjustment cylindrical tube 21 at the tip thereof are attached to the tip
opening 13a at the Z end, and the tip opening 21z is used as the speaker base 14 20 cm or more
away from the installation surface of the upper surface 14t. Here, the adjustment cylindrical tube
21 illustrated by hatching in FIG. 6 is press-fit and fixed so that a part thereof is inserted into the
inside of the extension cylindrical tube 20, and the insertion length can be varied. The insertion
length is adjusted according to the installation location of the speaker device and the room
condition. In addition, the cross-sectional area of the bottom face opening 13a at the time of
attaching the extension cylindrical tube 20 differs from the case where it does not attach in many
cases. Therefore, it is necessary to repeat the electrical characteristic measurement and hearing
of the system of the speaker device to select the optimum value.
[0058]
In addition, the modification of the attachment method of the extension cylindrical tube 20 is
shown below.
[0059]
<First Modification> FIG. 7 is a cross-sectional view showing the configuration of the Z end
portion of a two-way cylindrical housing type speaker device which is a first modification of the
second embodiment.
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A circular hole 115 is formed around the cylinder at the Z end of the cylindrical casing 1a, and
the extension cylindrical tube 20a is press-fitted thereto, whereby the sound wave from the
cylindrical casing 1a is released to the extension cylindrical tube 20a. The Z end portion is sealed
and closed by the cylindrical bottom surface 112 on the inner surface projecting ring 114
integrally formed with the Z end portion of the cylindrical housing 1a.
[0060]
<Second Modification> FIG. 8 is a cross-sectional view showing the configuration of the Z end
portion of a two-way cylindrical housing type speaker device which is a second modification of
the second embodiment. A circular hole 115 is formed around the cylinder at the Z end of the
cylindrical housing 1a, while a circular hole 116 having the same shape as the circular hole 115
is formed at the end of the extended cylindrical tube 20b. By pressing the communication
passage pipe 22 into both of 115 and 116, the sound wave from the cylindrical housing 1a is
made to escape to the extended cylindrical pipe 20b. The Z end portion is sealed and closed by
the cylindrical bottom surface 112 on the inner surface projecting ring 114 integrally formed
with the Z end portion of the cylindrical housing 1a. Also, on the inner surface projecting ring
214 integrally formed with the end of the extension cylindrical tube 20b, the end is sealed and
closed by the cylindrical bottom surface 212.
[0061]
<Effects of the First and Second Modifications> When the extension cylindrical tube 20 and the
adjusting cylindrical tube 21 are added as described above, the following effects are obtained. (A)
The best value of the size of the cross-sectional area is larger than when it is not attached. As a
result, the open-tubing character becomes stronger and the pipe length becomes longer, so the
lowest zone extends further downward. (B) The open end points downward, and the distance to
the speaker unit 2a is long, so the mutual interference of the sound pressure is weakened, and
the frequency characteristic is flat. (C) When an extended cylindrical pipe 20 having a crosssectional area smaller than that of the main pipe is attached, a character similar to that of a
tapered pipe appears, the characteristics extend in the lower region direction, and the muffling
character is obtained. Therefore, the sound pressure interference is reduced, and the volume of
the bass is generally increased. The extension by the extension cylindrical tube 20 strengthens
the tendency. (D) Since the sound pressure in the extension cylindrical tube 20 becomes weak,
the sound absorbing material in this portion can be removed, and the variable structure becomes
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possible.
[0062]
In the above embodiment and modifications, a cylinder is used in the cylindrical casings 1a, 1b,
1c, the extended cylindrical tube 20, the adjustment cylindrical tube 21 or the like, but the
present invention is not limited thereto, and a rectangular tube etc. A tubular member may be
used.
[0063]
As described above in detail, according to the present invention, the low-pitch speaker unit is
provided at one end, and the first cylindrical casing having a folded shape is provided with the
high-sound speaker unit at one end. A speaker device comprising: supporting means for
supporting at least one of the cylindrical second cylindrical casings so as to stand in a
substantially vertical direction, the speaker unit for high sound and the bass unit The upper limit
value Fmax of the crossover frequency F of the speaker unit is set to a frequency lower than the
frequency having a wavelength of 1⁄4 of the distance connecting the center of the high-pitch
speaker unit and the center of the low-pitch speaker unit The crossover frequency F is set to a
frequency which is equal to or less than the upper limit Fmax and substantially in the vicinity
thereof.
Alternatively, the lower limit value Fmin of the crossover frequency F of the high-pitched speaker
unit and the low-pitched speaker unit is set to a frequency that is one octave higher than the
frequency with the wavelength of the second cylinder casing as the wavelength. The upper limit
value Fmax of the over frequency F is set to a frequency lower than a frequency having a
wavelength of 1⁄4 of the distance connecting the center of the high sound speaker unit and the
center of the low sound speaker unit, and the crossover frequency F is set to the lower limit Fmin
or more and the upper limit Fmax or less.
[0064]
Therefore, according to the present invention, there is provided a speaker device capable of
solving the contradictory problem of high and low tone areas caused due to the length of the
cylindrical casing and faithfully reproducing the acoustic signal of the auditory sense area. can
do.
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[0065]
Also, most of the conventional speaker devices radiate the playback sound toward the front of
the speaker device, and although there are some radiating backwards, such as the sound played
by a live musical instrument or orchestra. Lack of presence and lack of natural feeling due to lack
of strong sound emission in all directions and upwards, etc., was found to be the most important
cause preventing reproduction of live-playing atmosphere. Can provide a speaker device capable
of unfolding in front of the eye a high fidelity reproduction over the entire audible band
including the super bass which was lacking in the similar system of FIG. .
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