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JP2006067325

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DESCRIPTION JP2006067325
PROBLEM TO BE SOLVED: To provide a speaker device capable of reducing the lowest resonance
frequency of the speaker device and suppressing the deterioration of sound quality. SOLUTION:
This tandem drive type speaker device is provided with two speaker units 1 and 51 arranged
back to back at one end, and the other end is provided with a sealed cylindrical casing 2. The
cylindrical thin tube 40 is provided so as to surround the magnets 1b and 51b in the speaker
unit coupling portion 101 in which the two speaker units 1 and 51 are arranged, and the
plurality of cylindrical thin tubes 20 are the speaker unit coupling portion 101 and the
cylindrical housing In the sound wave processing unit 102 between the other end of 2 and 2, the
longitudinal direction of each tubular capillary 20 is accommodated in the tubular casing 2 so as
to be parallel to the longitudinal direction of the tubular casing, and two loudspeaker units 1, 51
are The sound wave radiated to the inside of the cylinder case 2 when excited is maintained as a
plane wave. The reflection suppressing portion 4 is provided at the other end of the cylindrical
casing 2 and suppresses the reflection of the sound wave radiated to the inside at the other end
of the cylindrical casing 2. [Selected figure] Figure 1
Tandem drive type speaker device and its structure
[0001]
The present invention relates to a tandem drive type speaker device in which two speaker units
are arranged back to back in mutually opposite directions and driven in phase, and a structure
thereof.
[0002]
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1
For example, in patent document 1, in order to reduce the mechanical vibration which generate |
occur | produces from a speaker unit at the time of sound emission, and to reduce the
mechanical vibration of a cabinet and to aim at a sound quality improvement, acoustic space is
formed in the back surface of a diaphragm attached to a cabinet. The first speaker unit emits
sound from the front surface of the diaphragm by the drive signal supplied, and the second
speaker unit is fixed back to back, and in the direction opposite to the vibration direction of the
diaphragm of the first speaker unit by the drive signal. A speaker system (hereinafter, referred to
as a first conventional example) including a second speaker unit that vibrates a diaphragm in an
acoustic space formed by a cabinet.
Is disclosed. In the first prior art, two loudspeaker units are operated in phase and their back
surfaces are fixed to cancel two mechanical vibrations in opposite directions.
[0003]
In addition, in Non-Patent Document 1, in order to strengthen bass, a tandem drive type speaker
device in which two speaker units are arranged back to back in opposite directions and driven in
phase in a rectangular cylindrical closed casing ( Hereinafter, this will be referred to as a second
conventional example. The production article of) is disclosed.
[0004]
Unexamined-Japanese-Patent No. 10-178693 gazette. Unexamined-Japanese-Patent No. 2003092793. Takahisa Ozawa, "Production of Fostex FE 83 x 2 Tandem Drive System", Audio Craft
Magazine, No. 2, MJ Radio and Experiment Editor, pp. 35-39, published in October 2001.
[0005]
In the first conventional example, since the back surfaces of two speaker units are fixed to
control the inertia, the sound pressure is reduced and the minimum resonance frequency of the
speaker device can not be reduced. There was a point.
[0006]
Further, in the second conventional example, since the two speaker units are arranged back to
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back in the opposite direction in the rectangular cylindrical closed casing, the coupling of the
sound waves generated by the two speaker units is There is a problem that the sound quality is
degraded and the sound quality is degraded, and the bass can not be strengthened because it is a
small device.
[0007]
It is an object of the present invention to solve the above problems and to provide a tandem drive
type speaker device capable of reducing the minimum resonance frequency of the speaker device
and suppressing deterioration of sound quality as compared with the conventional example and
its structure. is there.
[0008]
The tandem drive type speaker device according to the first aspect of the present invention has
two speaker units disposed at one end back-to-back with each other at a predetermined distance
and one speaker unit is disposed outward, and the other end is sealed. What is claimed is: 1. A
tandem drive type speaker device comprising a cylindrical tubular casing, wherein the two
speaker units are electrically driven in substantially reverse phase so that sound wave vibrations
are substantially in phase with each other, In a speaker unit coupling portion in which individual
speaker units are disposed, a first cylindrical thin tube provided so as to surround magnets of the
two speaker units, the speaker unit coupling portion, and the other end of the cylindrical casing
And the two loudspeakers are housed in the cylindrical casing so that the longitudinal direction
of each cylindrical capillary is substantially parallel to the longitudinal direction of the cylindrical
casing. A plurality of second tubular capillaries for maintaining the sound waves radiated into the
interior of the tubular casing substantially as plane waves when the knit is excited, and the other
tube provided at the other end of the tubular casing, It is characterized by including a reflection
suppressing portion which substantially suppresses that a sound wave radiated into the inside of
the case is reflected by the other end of the cylindrical case.
[0009]
In the above-mentioned tandem drive type speaker device, in the above-mentioned speaker unit
coupling portion, the longitudinal direction of each tubular thin tube is accommodated in the
above-mentioned tubular casing so as to be substantially parallel to the longitudinal direction of
the above-mentioned tubular casing A plurality of third cylindrical thin tubes are further
provided for maintaining the sound waves radiated into the interior of the cylinder casing
substantially as plane waves when the unit is excited.
[0010]
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Further, in the above-mentioned tandem drive type speaker device, the reflection suppressing
portion is a conical shape disposed so that the apex is directed to the two speaker units, and a
pyramid disposed so that the apex is directed to the two speaker units It is characterized in that it
has a shape or an oblique cut shape.
[0011]
Furthermore, in the above-mentioned tandem drive type speaker device, the above-mentioned
reflection suppressing part is characterized in that the surface thereof is provided with a sound
absorbing layer for absorbing a sound.
[0012]
Still further, in the above-mentioned tandem drive type speaker device, it is characterized by
further including a sound absorbing and damping material provided between each of the
cylindrical thin tubes and the cylindrical casing.
[0013]
Furthermore, the above-mentioned tandem drive type speaker device is characterized by further
comprising a high-range reproduction speaker provided on the front surface of one of the two
speaker units disposed outward. Do.
[0014]
The structure of the tandem drive type speaker device according to the second aspect of the
present invention is such that one end is separated by a predetermined distance back to back at
one end and one speaker unit is provided with two speaker units arranged outward, and the
other end is sealed. Structure of a tandem drive type speaker device including the abovedescribed cylindrical tubular housing, and electrically driving the two speaker units in
substantially opposite phase so that sound wave vibration is substantially in phase with each
other. A first tubular capillary provided so as to surround the magnets of the two speaker units in
the speaker unit coupling part in which the two speaker units are disposed, the speaker unit
coupling part, and the cylinder casing In the sonication section between the other end of the tube
and the tubular casing, the longitudinal direction of each tubular capillary being accommodated
substantially in parallel with the longitudinal direction of the tubular casing; A plurality of second
cylindrical thin tubes for maintaining the sound waves radiated into the interior of the cylindrical
casing substantially as plane waves when the speaker unit is excited; and provided at the other
end of the cylindrical casing; A sound wave emitted to the inside of the cylinder case is
characterized by including a reflection suppressing portion that substantially suppresses
reflection at the other end of the cylinder case.
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[0015]
In the structure of the tandem drive type speaker device, in the speaker unit coupling portion,
the longitudinal direction of each tubular thin tube is accommodated in the tubular casing so as
to be substantially parallel to the longitudinal direction of the tubular casing; And a plurality of
third cylindrical thin tubes for maintaining the sound waves radiated to the inside of the
cylindrical casing substantially as plane waves when the speaker unit is excited.
[0016]
Further, in the structure of the tandem drive type speaker device, the reflection suppressing
portion is arranged in a conical shape, the apex of which is directed to the two speaker units, and
the apex of which is directed to the two speaker units. It has a pyramid shape or an oblique cut
shape.
[0017]
Furthermore, in the structure of the tandem drive type speaker device, the reflection suppressing
portion is characterized in that the surface thereof is provided with a sound absorbing layer for
absorbing a sound.
[0018]
Furthermore, the structure of the tandem drive type speaker device further includes a sound
absorbing and damping material provided between each of the cylindrical thin tubes and the
cylindrical casing.
[0019]
Furthermore, in the structure of the tandem drive type speaker device, there is further provided a
high frequency range reproducing speaker provided on the front surface of one of the two
speaker units disposed outward. It features.
[0020]
Therefore, according to the tandem drive type speaker device and the structure thereof
according to the present invention, the reflection suppressing portion substantially reflects that
the sound wave radiated to the inside of the cylinder casing is reflected by the other end of the
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cylinder casing. The sound wave radiated to the inside of the cylinder case by the first cylindrical
thin tube and the plurality of second cylindrical thin tubes is transmitted to the inside of the
cylinder case by the sound wave propagating in the speaker unit coupling portion and the sonic
processing portion. It can be maintained substantially by plane waves.
As a result, the lowest resonance frequency in the tandem drive type speaker device can be
significantly lowered to improve the frequency characteristic of the low frequency range, and the
sound pressure increase of the entire frequency characteristic in the tandem drive can be
faithfully reproduced in the original sound. realizable.
[0021]
Hereinafter, embodiments according to the present invention will be described with reference to
the drawings.
The same components are denoted by the same reference numerals.
[0022]
First Embodiment
FIG. 1 is a partially broken perspective view showing the structure of a tandem drive type
speaker device according to a first embodiment of the present invention.
2 is a longitudinal sectional view taken along the line AA 'of FIG. 1, FIG. 3 is a transverse
sectional view taken along the line BB of FIG. 2, and FIG. 4 is a sectional view taken along the line
CC' of FIG. It is a cross-sectional view.
The tandem drive type speaker device according to the present embodiment is as follows: (a) The
lower end is provided on the upper portion of the cylindrical casing 2 sealed by the casing base
portion 3; The speaker units are two speaker units 1 and 51 arranged outward (the external
speaker unit 1 and the internal speaker unit 51, hereinafter referred to as a speaker unit.
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And (b) a cylindrical thin tube 40 provided so as to surround the magnets 1b and 51b of the two
speaker units 1 and 51 in the speaker unit coupling part 101, and (c) the speaker Between the
plurality of cylindrical capillaries 30 provided in the space between the cylindrical capillary 40
and the cylindrical casing 2 in the unit coupling portion 101, (d) between the speaker unit
coupling portion 101 and the lower end of the cylindrical casing 2 Provided in the middle
portion of the cylindrical housing 2 located in the middle of the cylindrical housing 2 so that the
longitudinal direction of each cylindrical capillary 20 is substantially parallel to the longitudinal
direction of the cylindrical housing 2 in the cylindrical housing 2; A sound processing unit 102
having a plurality of cylindrical thin tubes 20 for maintaining the sound waves radiated into the
interior of the cylindrical housing 2 substantially as plane waves when the units 1 and 51 are
excited; A conical-shaped reflection suppressing portion 4 which is provided at the lower end of
the cylindrical case 2 and which substantially suppresses the sound wave radiated to the inside
of the cylindrical case 2 from being reflected at the lower end of the cylindrical case 2; (F) The
two speaker units 1 and 51 are characterized in that they are electrically driven in substantially
reverse phase so that sound wave vibrations are substantially in phase with each other.
[0023]
Next, with reference to FIGS. 1 to 4, the configuration of the tandem drive speaker device
according to the present embodiment will be described below.
[0024]
As shown in FIGS. 1 and 2, a speaker provided with a diaphragm 1a and a magnet 1b so that
sound waves from the front of the diaphragm from the speaker unit 1 are emitted upward at the
upper end of the cylindrical housing 2 The unit 1 is fixed to its mounting ring 2a.
In addition, the speaker unit 1 is back-to-back, and it is vibrated on the lower side than the
speaker unit 1 so that the magnets 1b and 51b face each other, preferably in proximity to the
magnet 1b with a predetermined interval. A speaker unit 51 provided with a plate 51a and a
magnet 51b is provided.
That is, the speaker unit 51 is provided in the opposite direction to the speaker unit 1 so that the
front surface of the diaphragm is directed inward.
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The distance between the two speaker units 1 and 51 is preferably as short as possible, as
described above, because the difference between the vibration times can be reduced as much as
possible.
This is particularly important when playing to the ultrahigh range with full-range speaker units 1
and 51, but it can not be ignored to obtain high-speed playback sound with high dynamics even
in the case of dedicated bass only It is.
[0025]
The two speaker units 1 and 51 constitute a speaker unit coupling part 101.
The two speaker units 1 and 51 are preferably identical to each other.
This is to equalize the vibration characteristics of both speaker units 1 and 51 as much as
possible, prevent the occurrence of amplitude distortion and phase shift due to interference of
different kinds of vibrations, and enhance the fidelity of waveform reproduction.
Further, the inner diameter of the cylindrical housing 2 is made as physically as possible equal to
the outer diameter of both speaker units 1 and 51.
This is to prevent the generation of spreading sound waves, that is, spherical waves.
Further, the mounting hole diameter of the baffle for mounting the speaker unit 1 is set to the
minimum diameter to which the speaker unit 1 can be mounted, and the mounting hole is
tapered to expand linearly downward.
This is to prevent the flow of the sound wave radiated from the speaker unit 1 toward the lower
end and to suppress as much as possible the collapse of the plane wave (in particular, the
collapse in the high region where the wavelength is short) due to the rapid change of the cross
section. .
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[0026]
In the speaker unit coupling portion 101, as shown in FIGS. 2 and 3, the sound absorbing and
damping material 14 is attached to the inside of the cylindrical housing 2, and the magnets 1b
and 51b of the speaker units 1 and 51 are surrounded. The cylindrical capillary 40 is provided
such that the longitudinal direction of the cylindrical capillary 40 is substantially parallel to the
longitudinal direction of the cylindrical housing 2, and the cylindrical capillary 40 is disposed in
the space between the cylindrical capillary 40 and the sound absorbing and damping material
14. For example, seven cylindrical thin tubes 30 are provided so that the longitudinal direction of
40 is substantially parallel to the longitudinal direction of the cylindrical housing 2. Thus, a space
30a of the propagation path of the sound wave generated when the speaker units 1 and 51 are
driven is formed. Here, the cylindrical thin tubes 30 and 40 are provided to propagate sound
waves generated when the speaker units 1 and 51 are driven in a direction substantially parallel
to the longitudinal direction of the cylindrical housing 2. In addition, although the cylindrical thin
tube 30 is inserted in the speaker unit coupling part 101 in order to enhance the fidelity of the
high range sound wave coupling of the full range speaker units 1 and 51, the diameter of the
cylindrical thin tube 30 is, for example, When the frequency is 10000 Hz, 34400 cm / 10000 Hz
= 3.4 cm or less. Further, the cylindrical thin tube 40 may be used as a donut-shaped enclosed
tube instead of the cylindrical thin tube 30, and is suitable for a large mid-bass speaker with a
low high frequency limit.
[0027]
Further, as shown in FIGS. 1 to 3, in the sonic processing unit 102, the sound absorbing and
damping material 13 is attached to the inside of the cylindrical housing 2, and in the space inside
the sound absorbing and damping material 13, For example, seven cylindrical thin tubes 20 are
provided such that the direction is substantially parallel to the longitudinal direction of the
cylindrical housing 2, thereby allowing propagation of sound waves generated when the speaker
units 1 and 51 are driven. Spaces 20a and 21 are formed. Here, the cylindrical thin tube 20 is
provided to propagate a sound wave generated when the speaker unit 1 or 51 is driven in a
direction substantially parallel to the longitudinal direction of the cylindrical housing 2.
[0028]
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The inner and outer peripheral surfaces of each cylindrical thin tube 20, 30, 40 are preferably
smooth surfaces in order to make the progress of the plane wave smooth, that is, not to disturb
the progress thereof. The outer peripheral surface may be rough to a certain extent, considering
that the traveling wave which is a plane wave travels in the inner peripheral surface of each of
the cylindrical capillaries 20, 30, 40. In addition, it is necessary to absorb the reflected wave or
standing wave incident substantially perpendicularly (horizontally, ie, in the lateral direction) to
the inner peripheral surface and the outer peripheral surface of each cylindrical thin tube 20, 30,
40. Therefore, it is preferable to form each cylindrical capillary tube 20, 30, 40 of a material that
can easily convert the acoustic energy into thermal energy, specifically, three to five-fold paper of
a material in which fibers are entangled It has a sound absorbing property with respect to a
reflected wave or a standing wave (it may be a single winding or a double winding). As the paper
of the above-mentioned material, for example, drawing paper made by Daisho Showa Paper Co.,
Ltd. (125 kg / 1000 sheets in thickness, for example, thickness of 0.2 to 0.3 mm) is suitable.
Alternatively, each cylindrical thin tube 20, 30, 40 may have a structure in which a multi-rolled
paper is surrounded by a single closed paper tube, and other materials may be used as long as
they have the same performance. May be. In addition, each cylindrical thin tube 20, 30, 40 may
have a cylindrical shape such as a rectangular cylindrical shape without being limited to the
cylindrical shape. Further, the sound absorbing and damping materials 13 and 14 are made of a
paper tube of the respective cylindrical thin tubes 20, 30 and 40, or a material of felt or micron
wool.
[0029]
Furthermore, the lower end of the cylindrical casing 2 is sealed by the casing base 3, and the
casing base 3 is used as a support member for erecting the device. Between the housing base 3
and the sonic processor 102, for example, a conical reflection suppressing portion 4 is formed on
the housing base 3 such that the apex thereof is directed to the speaker unit 51. The reflection
suppressing portion 4 is made of, for example, balsa wood or a resin molding material, and as
shown in FIG. 2, is constituted of a conical peripheral surface 4a and a conical bottom surface 4b.
Further, on the conical peripheral surface 4a, two sound absorbing layers 5 and 6 made of, for
example, felt and micron wool are formed. Furthermore, it is preferable to fill sand or zircon sand
in the inside of the reflection suppressing portion 4 in order to suppress vibration, absorb sound
waves, and lower the center of gravity. As an alternative, although only the effect of sound
absorption can be expected, a method of compression-filling with coarse felt, carbon fiber,
micron wool or the like may be used.
[0030]
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Here, the apex angle of the cone of the reflection suppressing portion 4 is preferably set to 60 °
to 100 °, and when it becomes an acute angle from the above value, the speaker unit coupling
portion 101 and the speaker unit coupling due to a decrease in volume of the sound processing
portion 102. The rise of the lowest resonance frequency of the part 101 becomes apparent.
Conversely, when the angle becomes obtuse, the reflected wave in the vertical direction becomes
apparent. Moreover, although it is preferable that the space | interval of the vertex of the
reflection suppression part 4 and the cylindrical thin tube 20 located in center part is more than
predetermined spacing, the cylindrical thin tube 20 located in the vertex of the reflection
suppression part 4 and center part And the apex of the reflection suppressing portion 4 may be
located inside the cylindrical thin tube 20 located at the center. Furthermore, the bottom side
diameter of the reflection suppressing portion 4 is made as close as possible to the inner
diameter of the cylindrical casing 2. Furthermore, the inner diameter of the cylindrical housing 2
is made to approximate the outer diameter of the speaker units 1 and 51.
[0031]
The material of the cylindrical thin tubes 20, 30, 40 in the tandem drive type speaker device
configured as described above and the role of the reflection suppressing portion 4 at the
lowermost end of the cylindrical casing 2 will be described below.
[0032]
The wall surfaces of the cylindrical thin tubes 20, 30, 40 are for transmitting the resonance
energy of the sound wave of a wavelength shorter than the diameter reflected in the diameter
direction of the cylindrical housing 2 body through the paper tube wall intertwined with the
fibers which is the wall surface material. It is converted into heat energy by fiber friction and
plays a role of attenuating sonic energy.
Therefore, the paper material suitable for the material of the cylindrical thin tubes 20, 30, 40 has
a semiconductive character of sound wave which absorbs 20 to 50% of sound waves in the
diameter direction and transmits 50 to 80% at the same time by friction of paper fibers. Is
desirable. The sound waves in the diameter direction in the cylindrical housing 2 attenuate the
resonance energy to a practically negligible level by penetrating a plurality of the paper
materials. Also, sound waves in the vertical direction (plane waves) intersecting at right angles to
the diameter direction can be transmitted through the cylindrical thin tubes 20, 30, 40 without
any resistance. Therefore, the inner wall surfaces of the cylindrical capillaries 20, 30, 40 are on
the smooth side of the paper material. As described above, the wall surface material of each of
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the cylindrical thin tubes 20, 30, 40 is made thin and made into a semiconductive character
paper tube, the sound wave having a length of the paper tube of 1⁄4 wavelength, and an integral
multiple thereof. This is to weaken the tube resonance of the sound wave. As the abovementioned paper material, for example, a watercolor thick paper S322N (neutral paper) made by
Marman is suitable. In addition, the cylindrical thin tubes 20, 30, 40 wind the above-mentioned
paper material in a single or triple manner and adhere the wound ends. The number of turns is
determined by cut and try according to the air participation rate and the hearing described
above. In addition, a sound absorbing material is disposed at the open end of the lowermost end
of the paper tube to absorb the sound reflection energy, and at the same time, the direction axis
of the sound reflected without being completely absorbed is deviated obliquely from the vertical
upper direction (plane wave In order to prevent the disturbance of (1), the conical reflection
suppressing portion 4 is disposed at the lowermost end of the cylindrical housing 2.
[0033]
Further, in the tandem drive type speaker device according to the present embodiment, the
bottom surface of the lower end of the cylindrical casing 2 is completely sealed for the following
reason. That is, the so-called tube resonance type in which the lower end of the cylindrical
housing 2 is opened, and the bass reflex type speaker device in which the bass is enhanced by
the Helmholtz resonance, etc. The internal noise leaks from the hole, which causes the
deterioration of the playback sound quality. In the present embodiment, in order to prevent the
above phenomenon, the cylindrical casing 2 is completely sealed, and the increase in the lowest
resonance frequency, which is a drawback of the closed type, is maintained by plane waves using
the cylindrical capillaries 20, 30, 40. It is solved by the structure. With the above structure,
sound waves radiated from the rear surface of the diaphragm of the speaker unit 1 and the front
surface of the diaphragm of the speaker unit 51 are radiated downward only as a plane wave, so
the bottom surface of the lower end of the cylindrical housing 2 The pressure of the sound wave
becomes higher in inverse proportion to the surface area ratio in the housing than the sound
pressure of the back of the housing of the prior art speaker device emitting a spherical wave.
Therefore, the reflection suppressing portion 4 is provided at the bottom of the cylindrical
housing 2 in the present embodiment. Further, by filling a sound absorbing material such as felt
or micron wool or a vibration suppressing material such as sand or zircon sand in the inside of
the reflection suppressing portion 4, unnecessary acoustic energy can be converted into heat
energy and dissipated, Thus, it is possible to efficiently suppress and reduce noise in the
cylindrical housing 2. Furthermore, unnecessary noise can be absorbed by forming the sound
absorption layers 5 and 6 on the surface of the reflection suppression part 4 excluding the
bottom surface, and the plane waves in the cylindrical housing 2 can be reduced.
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[0034]
In the tandem drive type speaker device configured as described above, the two speaker units 1
and 51 are electrically driven in substantially reverse phase so that the sound wave vibrations
are substantially in phase with each other. As a result, a plane wave of a sound wave substantially
in phase with the two speaker units 1 and 51 is formed and propagated in the cylindrical housing
2.
[0035]
As described above, according to the present embodiment, when the two speaker units 1 and 51
are electrically driven in substantially reverse phase so that the sound wave vibration is
substantially in phase with each other, each speaker unit The sound waves generated by 1, 51
are generated substantially synchronously in the cylindrical housing 2, and the sound waves
generated by the cylindrical capillaries 20, 30, 40 are substantially retained by plane waves, and
the tube diameter The sound wave of a wavelength shorter than that is suppressed so as not to
be reflected by the tube wall, and the plane wave is treated so as not to be reflected upward by
the reflection suppressing portion 4 at the lower end of the cylindrical housing 2. , 51 and the
amount of air moving with the diaphragm is increased. In addition, the cylindrical housing 2 is
hermetically sealed so that sound waves generated in the cylindrical housing 2 do not completely
leak out of the cylindrical housing 2, and noise is not generated due to the vibration of the
cylindrical housing 2 itself. There is. As a result, the lowest resonance frequency in the tandem
drive type speaker device can be significantly lowered to improve the frequency characteristic of
the low frequency range, and the sound pressure increase of the entire frequency characteristic
in the tandem drive can be faithfully reproduced in the original sound. realizable.
[0036]
Although the cylindrical thin tube 30 is provided in the above embodiment, the present invention
is not limited to this, and may not be provided.
[0037]
Second embodiment.
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FIG. 5 is a partially broken perspective view showing the structure of a tandem drive type
speaker device according to a second embodiment of the present invention, FIG. 6 is a top view
of the tandem drive type speaker device of FIG. It is a longitudinal cross-sectional view of the
upper part of the tandem drive-type speaker apparatus of FIG. In the tandem drive type speaker
device according to the present embodiment, compared to the tandem drive type speaker device
of FIG. 1, (A) a speaker 61 for high frequency range reproduction called a so-called tweeter is
provided on the front of the speaker unit 1 ) It is characterized in that the cylindrical thin tube
40 is not provided. In the present embodiment, the cylindrical thin tube 40 is not provided, but
may be provided as in the first embodiment. Hereinafter, the difference will be described.
[0038]
In FIGS. 6 and 7, the high-range reproduction speaker 61 is mounted on the central axis of the
cylindrical housing 2 on a blanket 70 having a plurality of sound holes 70h via a solvossein 61s
which is a vibration absorbing material. Here, the blanket 70 is fixed to the mounting portion 2 a
of the frame outer edge portion of the diaphragm 1 a of the mid-bus of the speaker unit 1 by
means of the screw 73 through the solvossein 71. In addition, a felt 62 is provided at the lower
part of the high-range reproduction speaker 61 for sound absorption and suppression of sound
pressure from the mid bass. As described above, by attaching the high-range reproduction
speaker 61, the influence of mechanical vibration and sound pressure vibration caused by the
mid-bus of the speaker unit 1 from acting on the high-range reproduction speaker 61 as much as
possible is suppressed. Prevent occurrence.
[0039]
In the present embodiment, in particular, in the large-sized tandem drive type speaker device, the
speaker 61 for high-range reproduction is added to reproduce a large volume, and the large-sized
speaker unit 1 is used for the mid-bus. By providing a plane wave maintaining mechanism such
as the cylindrical thin tube 20, the weight of air can be effectively used to obtain energy of a
sufficiently large bass range. Here, as shown in FIG. 7, the additional mechanism of the highfrequency range reproduction speaker 61 mounts the high-range range reproduction speaker 61
so as to be close to the mid-bus speaker unit 1 and coaxial with the cylindrical housing 2
Operation is performed in the full range mode while using two speaker units 1 and 51 so that the
reproduced sound wave is synthesized with naturalness. In addition, in order to bring out the
naturalness of the full range mode described above, the speaker unit 1 of the mid bass is selected
with a superior middle-to-high range characteristic (the characteristic that the sound pressure
decreases toward the high region) and the amplifier output is networked. It is preferable to
04-05-2019
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supply the solution straight through. Furthermore, the crossover frequency of the high-range
reproduction speaker 61 is selected so that the high-range reproduction speaker 61 compensates
for the shortage of the high range in the mid-bus speaker unit 1, and the optimal attenuation
characteristics are determined simultaneously. There is. Since the speaker device according to
the present embodiment has non-directional characteristics in the horizontal direction (strictly,
the same horizontal surface), it has the feature that the unnatural synthesis of the air waves of
the sound waves emitted by the two speaker units 1 and 51 is less noticeable There is.
[0040]
According to the embodiment configured as described above, the sound pressure in the high
frequency range is increased by the added high frequency range reproduction speaker 61, and
the lowest resonance in the tandem drive type speaker device as in the first embodiment. The
frequency can be greatly reduced to improve the frequency characteristic of the low band, and
the sound pressure increase of the entire frequency characteristic in the tandem drive can be
realized in a state in which the original sound is faithfully reproduced.
[0041]
Modified example.
FIG. 8 is a perspective view showing a structure of an oblique cut reflection suppressing portion
4A according to a first modified example of the present invention. In FIG. 8, the diagonally cut
reflection suppressing portion 4A has a shape obtained by diagonally cutting a cylinder, and is
configured to include a diagonally cut upper bottom surface 4d, a circumferential surface 4c, and
a bottom surface 4e. Here, the apex angle between the upper bottom surface 4d and the
circumferential surface 4c is preferably set to 45 ° ± 10 °. The cylindrical wall surface of the
reflection suppressing portion 4A is parallel to the traveling axis of the sound wave, and the
upper bottom surface of the oblique cut is a lid of the oblique cut portion, so the material of the
circumferential surface 4c is, for example, a multi-layered paper of about 10 mm thickness It is
preferred to use a tube. Moreover, it is preferable to use a soft wood of 1 to 2 mm thickness,
such as balsa wood or a soft resin, as the material of the upper bottom 4d.
[0042]
FIG. 9 is a perspective view showing the structure of a pyramid-type reflection suppressing
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portion 4B according to a second modification of the present invention. In FIG. 9, the pyramidshaped reflection suppressing portion 4B has a pyramid shape whose bottom surface is a square,
and the apex angle thereof is preferably 60 ° to 100 ° for the same reason as the conical
shape. The diagonal length of the bottom square is made as close as possible to the inner
diameter of the cylindrical housing 2. Further, it is desirable that the wall surface of the reflection
suppressing portion 4B be made of a soft lumber having a thickness of 1 to 2 mm, such as balsa
wood. The inside is filled in the same manner as the conical reflection suppressing portion 4.
[0043]
FIG. 10 is a cross-sectional view corresponding to FIG. 4 of a tandem drive type speaker device
according to a third modification of the present invention. In the third modification, a cylindrical
thin tube 25 thinner than the cylindrical thin tube 20 is further provided in the inner space 20a
of each cylindrical thin tube 20 as compared with the first embodiment of FIG. It is characterized
in that seven cylindrical thin tubes 25 are filled and accommodated. Thereby, the maintenance
function of the plane wave in each cylindrical thin tube can be extended to a high region, and the
sound absorption effect in the cylindrical housing 2 can be further enhanced. In the third
modification, seven cylindrical capillaries 25 are packed and accommodated per one cylindrical
capillary 20. However, the present invention is not limited to this, and preferably four cylindrical
capillaries 25 or A plurality of cylindrical thin tubes 25 may be accommodated.
[0044]
FIG. 11 is a cross-sectional view corresponding to FIG. 4 of a tandem drive type speaker device
according to a fourth modification of the present invention. The fourth modified example is
characterized in that the regular hexagonal cylindrical thin tube 26 is filled and accommodated
instead of the cylindrical thin tube 20 according to the first embodiment. In the case of the
regular hexagonal cylindrical thin tube 26, the cross section becomes a so-called honeycomb
shape and no space is generated between the regular hexagonal cylindrical thin tubes 26.
Therefore, a large number of regular hexagonal cylindrical thin tubes 26 are accommodated to
maintain plane waves. Sound quality improvement can be made remarkable.
[0045]
FIG. 12 is a cross-sectional view corresponding to FIG. 4 of a tandem drive type speaker device
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according to a fifth modification of the present invention. The fifth modified example is
characterized in that an isosceles triangular cylindrical thin tube 27 is filled and accommodated
instead of the cylindrical thin tube 20 according to the first embodiment. In the case of this
isosceles triangular cylindrical capillary tube 27, there is no space between the respective
isosceles triangular cylindrical capillary tubes 27. Therefore, a large number of isosceles
triangular tubular capillaries 27 are accommodated to significantly improve the sound quality by
maintaining plane waves. Can be
[0046]
FIG. 13 is a cross-sectional view corresponding to FIG. 4 of a tandem drive type speaker device
according to a sixth modification of the present invention. In the sixth modification, instead of the
cylindrical thin tube 20 according to the first embodiment, the thin tube located at the central
portion of the cylindrical housing 2 is the cylindrical thin tube 20, and It is characterized in that
an elliptical cylindrical tubule 28 is filled and accommodated between the cylindrical casing 2
and the cylindrical casing 2. Each elliptical cylindrical capillary tube 28 is unlikely to have a
standing wave in the capillary tube because the inner diameter is not constant like a circle, and
furthermore, the number of the elliptical cylindrical capillary tubes 28 in the periphery can be
increased, so that the sound quality can be excellent. .
[0047]
Although the cylindrical housing 2 is used in the above embodiment and modification, the
present invention is not limited to this, and a housing having a polygonal or elliptical cylindrical
shape other than a cylindrical shape is used. It is also good.
[0048]
In the above-mentioned embodiment and modification, although cylindrical thin tubes 20, 30, 40
are used, the present invention is not limited to this, and cylindrical shapes such as triangular or
more polygonal or elliptical cylindrical shapes other than cylindrical shapes You may use the thin
tube which has these.
[0049]
In the present embodiment, processing of the sound processing unit 102 will be described.
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Among the functions necessary for the sound wave processing unit 102, the essential technology
indispensable for realizing a tandem drive type speaker device uses the lowest resonance
frequency f0c of the speaker unit 51 mounted in the cylindrical housing 2 The value is as close
as possible to the lowest resonance frequency f0 of the free space of the speaker unit.
Hereinafter, the technology for realizing it will be described theoretically.
[0050]
The internal volume V of the cylindrical housing 2 is expressed by the following equation. Note
that, in the specification, the number number of the black bracket in which the expression is
image input and the expression number of the square bracket in which the expression is
character input are mixed and used, and a series of in the specification is used. The formula
number is assigned to the last part of the formula using the formula "formula (1)" as the formula
number.
[0051]
[Equation 1] V = (350 × a <4>) / [m0 (f0c <2> −f0 <2>)] (liter) (1)
[0052]
Here, a is the effective radius (cm) of the diaphragm of the speaker unit, and m 0 is the effective
weight of the diaphragm, which is expressed by the following equation.
[0053]
[Equation 2] m0 = mc + ma (2)
[0054]
Here, mc is the weight when the diaphragm is at rest, and ma is the weight of air that moves with
the diaphragm while the diaphragm is in operation.
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The weight of air is 1.2 grams / liter.
[0055]
In this case, when the lowest resonance frequency f0c of the speaker unit 51 attached to the
speaker unit coupling portion 101 of the cylindrical casing 2 is derived from the above equation
(1), the following equation is obtained.
[0056]
[0057]
In the cylinder-cassette type tandem drive speaker device prototyped by the present inventor, the
minimum resonance frequency f0c can be approximated to the minimum resonance frequency f0
by using the technique according to the present invention mainly to increase the weight ma. On
the contrary, from the measured values of the lowest resonance frequencies f0c and f0, the
weight ma, that is, the weight of air moving with the diaphragm (strictly, it is a value obtained by
subtracting the air spring force opposite to the movement of the weight ma) The following shows
how much it was possible to increase
[0058]
Below, various numerical values of the prototype device by the present inventor are shown, and
the value of weight ma is determined.
[0059]
(1) V = 4.3 liters (effective volume of the speaker unit coupling portion 101).
(2) a = 2.8 cm (effective radius of 8 cm speaker unit 1, 51) (3) mc = 1.4 gr (weight of diaphragm
of speaker unit 1, 51).
(4) f0 = 95 Hz (lowest resonance frequency in free space (see FIG. 14)).
(5) f0 c = 100 Hz (the lowest resonance frequency of the measured data of the prototype device
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(see FIG. 15)).
[0060]
Here, FIG. 14 is a frequency characteristic diagram showing the lowest resonance frequency f0 of
free space in one 8 cm speaker unit.
FIG. 15 shows the tandem drive type speaker device of FIG. 1 (however, the reflection
suppressing portion is not disposed, and only the first and second sound absorbing layers 5 and
6 are provided.
In the above, a frequency characteristic diagram showing the lowest resonance frequency f0c
when two 8 cm speaker units are mounted.
[0061]
From the above equation (3), the weight ma is represented by the following equation.
[0062]
[Equation 3] ma = [350 × a <4> / V (f0c <2> −f0 <2>) − mc (4)
[0063]
Substituting the above value in the above equation (4) gives the following equation.
[0064]
[Equation 4] ma = 3.73 gr (5)
[0065]
Therefore, the weight of air having an effective volume V (4.3 liters) is given by the following
equation: 4.3 × 1.2 = 5.16 gr (6) The (effective contribution rate) A is expressed by the following
equation.
04-05-2019
20
[0066]
[Equation 6] A = (3.73 / 5.16) × 100% = 72.3% (7)
[0067]
As is clear from the above equation (7), it can be seen that the weight of air moving with the
diaphragm of the speaker unit is significantly increased, which allows the lowest resonance
frequency f0c to be closer to the lowest resonance frequency f0 The amount that can be done
can be evaluated by the relative amount.
[0068]
As described above in detail, according to the tandem drive speaker device and the structure
thereof according to the present invention, the sound wave radiated to the inside of the cylinder
casing by the reflection suppressing portion is the other end of the cylinder casing While
suppressing the reflection substantially, the first cylindrical capillary and the plurality of second
cylindrical capillaries allow the sound wave propagating in the speaker unit coupling portion and
the sonic processing portion to be contained in the cylindrical casing. The emitted sound waves
can be substantially maintained as plane waves.
As a result, the lowest resonance frequency in the tandem drive type speaker device can be
significantly lowered to improve the frequency characteristic of the low frequency range, and the
sound pressure increase of the entire frequency characteristic in the tandem drive can be
faithfully reproduced in the original sound. realizable.
[0069]
BRIEF DESCRIPTION OF THE DRAWINGS It is a partially broken perspective view which shows
the structure of the tandem drive-type speaker apparatus which concerns on the 1st Embodiment
of this invention.
It is a longitudinal cross-sectional view about the A-A 'line | wire of FIG.
It is a cross-sectional view about the B-B 'line | wire of FIG.
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21
It is a cross-sectional view about the C-C 'line | wire of FIG.
It is a partially broken perspective view which shows the structure of the tandem drive type
speaker apparatus which concerns on the 2nd Embodiment of this invention.
It is a top view of the tandem drive-type speaker apparatus of FIG.
It is a longitudinal cross-sectional view of the upper part of the tandem drive-type speaker
apparatus of FIG.
It is a perspective view which shows the structure of diagonal cut type | mold reflection
suppressing part 4A which concerns on the 1st modification of this invention. It is a perspective
view which shows the structure of pyramid type | mold reflection suppressing part 4B which
concerns on the 2nd modification of this invention. It is a cross-sectional view corresponding to
FIG. 4 of the tandem drive type speaker apparatus which concerns on the 3rd modification of this
invention. It is a cross-sectional view corresponding to FIG. 4 of the tandem drive type speaker
apparatus which concerns on the 4th modification of this invention. It is a cross-sectional view
corresponding to FIG. 4 of the tandem drive type speaker apparatus which concerns on the 5th
modification of this invention. It is a cross-sectional view corresponding to FIG. 4 of the tandem
drive type speaker apparatus which concerns on the 6th modification of this invention. It is a
frequency characteristic view showing the lowest resonance frequency f0 of free space in one 8
cm speaker unit. The tandem drive type speaker device of FIG. 1 (However, the reflection
suppressing portion is not disposed, and only the first and second sound absorption layers 5 and
6 are provided. In the above, a frequency characteristic diagram showing the lowest resonance
frequency f0c when two 8 cm speaker units are mounted.
Explanation of sign
[0070]
1, 51: Speaker unit, 1a, 51a: Diaphragm, 1b, 51b: Magnet, 2: Cylindrical casing, 3: Casing base
portion 4, 4A, 4B: Reflection suppression portion 13, 14: sound absorbing and damping material
20, 25, 30, 40: cylindrical capillary, 20a, 30a: internal space, 21, 22: space, 26: regular
hexagonal cylindrical capillary, 27: isosceles triangular cylindrical capillary 28: Elliptical tubular
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thin tube 61: High frequency range reproduction speaker 101: Speaker unit coupling portion
102: Sound wave processing portion
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