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JPH11196487

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JPH11196487
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
improvement of a phase inversion type speaker device suitable for use in a small and light
speaker device.
[0002]
2. Description of the Related Art Conventionally, an opening and a duct are provided on a baffle
plate provided with a speaker as an effective means for extending the low-range reproduction
limit, and the duct is inverted by inverting the phase of the sound emitted from the back of the
diaphragm of the speaker. It is well known that a bass reflex type (phase inversion type) speaker
device in which sound waves emitted from the aperture to the outside and emitted from the
diaphragm of the speaker to the front surface are intensified to prevent distortion of the bass
range.
[0003]
However, the above-described phase-reversal type speaker device is miniaturized, and
particularly in the case where the speaker box is formed of a synthetic resin such as ABS, the
sound pressure is counteracted when the sound wave is emitted through the opening of the duct.
As a result of the reaction in the opposite direction, the speaker box swings, the sound image
localization is not determined, and the reproduced sound quality is significantly degraded.
[0004]
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1
In order to solve such a problem, for example, Japanese Patent Application Laid-Open No. 638284 proposes a phase inversion type speaker device having a configuration as shown in FIG.
[0005]
In FIG. 6, 1 is a speaker box, 2 is a baffle plate, 3a and 3b are speakers, 4 is a substantially Tshaped duct, and 6 is a back plate.
[0006]
Here, the duct 4 is composed of a first duct 4 e for communicating the baffle plate 2 and the rear
face plate 6 and a second duct 4 f whose one end is connected to a substantially intermediate
portion of the first duct 4 e.
Here, the cross-sectional area of the first duct 4e is twice that of the second duct 4f.
Further, the distance from the speaker 3a for bass reproduction to the opening 4b via the
opening 4a and the distance to the opening 4d are substantially the same.
[0007]
The action of the duct 4 having the above-described configuration is as follows. The sound
pressure by the sound pressure radiated from the rear surface of the bass reproduction speaker
3a enters the opening 4a of the second duct 4f.
When the sound waves traveling inside the second duct 4f reach the first duct 4e, they are
divided into right and left at a substantially intermediate portion of the first duct 4e, and the
openings 4b on the baffle plate 2 side and the openings of the rear plate 6 It radiates from each
part 4d.
Here, since the distance from the speaker 3a for bass reproduction to the opening 4b via the
opening 4a and the distance to the opening 4d are substantially the same, the opening 4b and
the opening 4d are the same. Sound waves from the sound pressure of the same phase are
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2
emitted in the reverse direction from
[0008]
Therefore, as shown in the figure, since the reaction forces FD and -FD shown by the respective
sound pressure arrows are in phase with each other and act on the speaker box 1 in the opposite
direction, the respective reactions are canceled out. It is designed to
[0009]
According to the speaker apparatus shown in FIG. 5 described above, the directions of the
reaction forces FD and -FD due to the sound pressure radiated from the openings 4b and 4d of
the first duct 4e in the duct 4 Are respectively reversely set to cancel the reaction due to the
radiation sound pressure, so that the swinging of the speaker box in the front-rear direction can
be suppressed.
[0010]
However, depending on the position where the speaker units 3a and 3b are arranged in the
speaker box 1, the sound quality is deteriorated by swinging the speaker cabinet 1 horizontally
or vertically, and there is a problem that sound image localization and the like can not be
determined.
[0011]
The present invention is intended to provide a speaker device that solves the problem of
overhead, and the problem to be solved by the invention is that the reaction force of the speaker
built in the speaker box is arranged such that the back surface of the speaker faces each other.
The speaker or exciter cancels the vibration, the vibration due to the reaction force of the
speaker box up and down, right and left, back and forth is canceled by a pair of ducts extending
from the speaker box up and down, left and right, back and forth It is an object of the present
invention to provide a speaker device in which the radiation power of the bass becomes
extremely strong by supporting the reaction force by the radiation.
[0012]
According to the present invention, there is provided a speaker apparatus according to the
present invention, which comprises a pair of speakers disposed so as to be able to emit sound so
that the back surfaces face each other at symmetrical positions in front and rear or left and right
(upper and lower) of the speaker box. A pair of ducts are disposed at symmetrical positions on
the other pair of side surfaces of the speaker box to which the pair of speakers is attached.
04-05-2019
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[0013]
According to the pair of speakers configured as described above (one of the speakers includes an
exciter), the product of the mass of the vibration system of each pair of speakers and the
acceleration of the diaphragm, ie, the pair of respective speakers The reaction forces against the
radiation force cancel or attenuate each other, and the reaction forces due to the radiation force
of a pair of ducts provided on the other side of the speaker box where the pair of speakers is not
disposed cancel or attenuate Thus, front and rear or left and right (up and down) vibrations of
the speaker box are prevented.
Therefore, even if it is a small and light speaker box, the vibration of the speaker box can be
completely prevented, the bass can be enhanced by the radiation force of the duct, and a small
and light speaker device with improved sound quality can be obtained. .
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the speaker device according
to the present invention will be described below with reference to FIGS.
[0015]
FIGS. 1A to 1F show the basic configuration of the speaker device according to the present
invention, and the corresponding parts to those in FIG.
[0016]
Each of the speaker devices shown in FIGS. 1A to 1F is a cross-sectional view in which the
speaker box 1 is cut in parallel to the baffle plate (see FIG. 6) of the speaker box 1. The light and
thin speaker box 1 is a box made of synthetic resin such as ABS. The speaker box 1 is provided
with a pair of speakers and a pair of ducts at symmetrical positions of the pair of front and rear
or upper and lower portions of the speaker box or the central portion of the left and right side
plates. Is designed to completely balance the vibration.
[0017]
In FIG. 1A, speakers 3c and 3d preferably have a pair of identical driving forces and equal lowest
resonance frequencies to the left and right side plates 1L and 1R of the speaker box 1, and the
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back side on which ring magnets are provided face each other. And 1R, and are attached to face
the sound output holes 5L and 5R that are pierced at the center position of the ring 1R.
[0018]
Further, openings 7a and 7b are bored so as to face each other at the central position of upper
and lower top plate 1U and bottom plate 1D constituting speaker box 1, and ducts 4g and 4h
having the same inner diameter and length in openings 7a and 7b. It is inserted and fixed.
[0019]
When legs 8 are attached to the bottom plate 1D in the configuration of FIG. 1A described above,
U is the upper side (top plate side) of the speaker box 1, D is the lower side (bottom plate side), L
is the left side (left side plate side), R Shows the right side (right side plate side), B shows the rear
side (rear side plate side), and F shows (the baffle plate side).
[0020]
If the speaker box 1 is turned 90 degrees in FIG. 1A to make it horizontally long and the leg 8 is
attached to the right side plate, the relationship between L and R becomes U and D, and the
relationship between D and U can be used as the relationship between L and R.
[0021]
According to the above-mentioned configuration, the reaction forces -F1 and -F2 to the radiation
forces F1 and F2 which are the products of the mass and acceleration of the vibration system of
the pair of speakers 3c and 3d are symmetrical positions of the centers of the left and right side
plates 1L and 1R of the speaker box. It is almost completely canceled or attenuated because it is
Similarly, the reaction forces -F3 and -F4 to the duct radiation forces F3 and F4 from the
openings 7a and 7b of the ducts from the upper and lower ducts 4g and 4h are at symmetrical
positions of the centers of the top plate 1U and bottom plate 1D of the speaker box. Being
arranged, it is possible to cancel or attenuate almost completely.
[0022]
Each structure shown in FIGS. 1B to 1F is configured to cancel the reaction force of the pair of
speakers and the pair of ducts based on the same principle as described above.
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[0023]
In the case of FIG. 1B, a pair of ducts 4g and 4h are provided at the center position of the top
plate 1U and the bottom plate 1D of the speaker box 1, and a pair of speakers having sound
emission holes 5L and 5R at the center position of the baffle plate 2 and the back plate 6. In this
case, 3c and 3d are disposed, -F1 and -F2 are mutually offset, and -F3 and -F4 are mutually
offset.
[0024]
In the case of FIG. 1C, a pair of ducts 4g and 4h are provided at the center position of the left
side plate 1L and the right side plate 1R of the speaker box 1, and a pair of sound emission holes
5L and 5R are provided at the center position of the baffle plate 2 and the back plate 6. This is
the case where the speakers 3c and 3d are disposed, -F1 and -F2 are mutually offset, and -F3 and
-F4 are mutually offset.
[0025]
In the case of FIG. 1D, a pair of ducts 4g and 4h are provided at the center position of the baffle
plate 2 and the back plate 6 of the speaker box 1, and a pair of speakers having sound emitting
holes 5L and 5R at the center position of the top plate 1U and the bottom plate 1D. In this case,
3c and 3d are disposed, -F1 and -F2 are mutually offset, and -F3 and -F4 are mutually offset.
[0026]
Further, in the case of FIG. 1E, a pair of ducts 4g and 4h are provided at the central position of
the baffle plate 2 and the back surface plate 6 of the speaker box 1, and sound emitting holes 5L
and 5R are provided at the central position of the left side plate 1L and the right side plate 1R. In
this case, a pair of speakers 3c and 3d are provided, -F1 and -F2 are mutually offset, and -F3 and
-F4 are mutually offset.
[0027]
Furthermore, in the case of FIG. 1F, a pair of speakers 3c and 3d having a pair of sound output
holes 5L and 5R is disposed at the center position of the top plate 1U and bottom plate 1D of the
speaker box 1. In this case, a pair of ducts 4g and 4h are disposed at the central position of the
plate 1R, and -F1 and -F2 are mutually offset, and -F3 and -F4 are mutually offset.
[0028]
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6
Next, with reference to FIG. 2, a speaker device showing another original configuration of the
present invention will be described.
[0029]
In FIG. 2, the corresponding parts to FIGS. 1A to 1F are given the same reference numerals and
the duplicate description is omitted, but the pair of speakers 3 c and 3 d are a pair of front, rear,
left, right, upper and lower of the speaker box Among the side plates, for example, the duct 4h is
attached to the left and right side plates 1L and 1R, and the duct 4h is inserted into and fixed to
any one side plate of the six side plates, for example, the opening 7b pierced in the bottom plate
1D. The reaction forces of the sound radiation from 3c and 3d are collected at the inlet opening
10 of one duct 4h and emitted from the duct 4h to fix the speaker box firmly and the sound
pressure of the reaction force of the two speakers is one opening At this time, the direction is
changed, and the light is emitted in a predetermined direction of the speaker box 1, and the
sound pressure of the bass radiation is increased to emit the sound.
[0030]
In the configuration of FIG. 2, the duct 4h of the speaker box 1 is directed downward, and the
directions of the sound pressure of the two speakers are radiated from the opening 7b of the
duct 4h as duct radiation force F3 = -F1 + (-F2). In the case where the small and light speaker is
supported more stably on a desk or the like by adding the downward radiation force F3 of the
duct 4h to the weight W of 1, the duct or the radiation speaker according to FIGS. 3 to 5 An
arrangement is described below in which the reaction force of the radiation force of these ducts
or speakers is exerted on the bottom plate side to support the speaker box by disposing on the
top plate side of the speaker cavity.
[0031]
FIG. 3 shows a speaker box 1 molded of synthetic resin such as ABS, provided with a back plate 6
in the paper surface direction, and has a front plate (baffle plate) 2 on the front side of the paper,
and the centers of the left and right side plates 1L and 1R. Sound emission holes 5L and 5R are
pierced at the positions, and speakers 3c and 3d having substantially the same minimum
resonance frequency f0 are mounted facing the sound emission holes 5L and 5R respectively so
that the magnets 11L and 11R sides of the back of the speakers face each other. It is done.
[0032]
The upper and lower sides, the left and right and the rear of the speakers 3c and 3d are
surrounded by the casings 12L and 12R, and the second and the third of the casings 12L and
12R are formed in the first cavity 13 formed by the space portion surrounded by the side plates
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of the speaker box 1. The second and third cavities 14L and 14R formed by three spaces are
formed.
[0033]
Openings 15L and 15R are formed below the casings 12L and 12R to form ducts 16L and 16R
bent substantially at right angles.
[0034]
In FIG. 3, the ducts are configured using the left and right side plates 1L and 1R and the bottom
plate 1D as the curved ducts 16L and 16R, but U-shaped cylindrical members are inserted and
fixed in the openings 15L and 15R formed in the casings 12L and 12R. You may
An opening 17 is bored at the center of the upper surfaces of the bent ducts 16L and 16R.
[0035]
Accordingly, the back pressure of each of the speakers 3c and 3d is radiated from the opening
17 into the first cavity 13 through the second and third cavities 14L and 14R and the ducts 16L
and 16R.
[0036]
A duct 4g is disposed at a central position of the top plate 1U of the speaker cabinet 1, and a
duct opening 7a is bored.
[0037]
Furthermore, a resistive material such as a urethane home may be embedded in the duct 4g to
increase the mechanical radiation resistance R0 of the duct 4g.
[0038]
In the above configuration, when acoustic signals are supplied to the speakers 3c and 3d, when
the equivalent masses of the speakers 3a and 3b are m1 and m2 and the acceleration of the
diaphragm is .alpha.1 and .alpha.2, arrows F1 and The sound radiation force indicated by F2 is
such that F1 = m1.alpha.1 and F2 = m2.alpha. Work. Naturally, the reaction of the sound
04-05-2019
8
radiation forces F1 and F2 acts on the speakers 3c and 3d.
[0039]
In this example, the reaction forces of -F1 and -F2 are offset each other to support each other
and prevent the speaker cabinet 1 from rocking back and forth.
[0040]
Next, when functioning as the phase opposite duct 4g, sound waves due to the sound pressure of
the reaction forces -F1 and -F2 from the diaphragms of the speakers 3c and 3d are the second
and third cavities 14L and 14R and the ducts 16L and 16R. Through the first cavity 13 via the
common opening 17 and phase-reversed from the opening made in the top plate 1U and emitted
to the outside.
[0041]
Therefore, when the diaphragms 18L and 18R of the speakers 3c and 3d are both driven in the
sound radiation direction indicated by F1 and F2, the air in the first and second cavities 14L and
14R expands and the first cavity 13 is expanded. The air inside is injected through the opening
17 in the direction indicated by FD2.
At this time, assuming that the load of the speaker box 1 is W, the suction force indicated by the
FD 2 is added to the load in the direction of the bottom plate 1D to operate the speaker box 1
more stably.
[0042]
Of course, the air sucked from the opening 17 is diverted into the respective cavities via the
openings 15L and 15R which are formed in the bent ducts 16L and 16R and the first and second
cavities 14L and 14R.
Therefore, since the stiffnesses SC2 and SC3 in the first and second cavities 14L and 14R can be
kept substantially constant, the adverse effect of raising the lowest resonance frequency of the
speakers 3c and 3d can be eliminated.
04-05-2019
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[0043]
Furthermore, when driving the speakers 3c and 3d in the directions of F1 and F2 as described
above, air in the atmosphere (outside of the speaker box 1) is sucked in the direction indicated by
-FD1 even in the duct 4g. The force vector is also added to the speaker load W, and the
downward force is supported as W + (− FD1) + FD2 to make it more stable.
[0044]
Next, when the diaphragms 18L and 18R of the speakers 3c and 3d are driven in the reaction
directions as shown by -F1 and -F2, the air in the first and second cavities 14L and 14R is
compressed, The air is discharged into the first cavity 13 from the common opening 17 through
the openings 15L and 15R below the cavities 14L and 14R and the bent ducts 16L and 16R from
the common opening 17 by a radiation force indicated by -FD2.
At this time, a reaction force indicated by FD2 acts in the direction of the bottom plate 1D.
[0045]
Similarly, the air in the first cavity 13 is also emitted outside the speaker box 1 through the
opening 7a of the duct 4g.
At this time, the reaction force shown by FD1 acts in the direction of the bottom plate 1D of the
speaker box 1 with respect to the radiation force -FD1 of the duct 4g. For this reason, a force of
W + (-FD1) + (+ FD2) is applied to the bottom plate of the speaker box It can be seen that a
lightweight speaker can be supported stably by applying a reaction force in the vertical direction.
[0046]
Generally, in the case of a dynamic speaker, the force F = mα applied to the diaphragms 18L and
18R is determined by the following equation (1).
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[0047]
Here, WE is an audio signal input applied to the speaker, Bg is the magnetic flux density of the
magnetic gap of the magnetic circuit, Vv is the effective volume of the voice coil, δ is the
resistivity of the material of the voice coil, and Q is the lowest resonance frequency of the
speaker. Resonance sharpness.
[0048]
Also, the force FD = FD1 = FD2 = mD αD applied to the duct is determined from the following
equations (2) and (3).
SS αS = SD αD (2) where SS is the effective area of the speaker, SD is the area of the duct, γ is
the effective radius of vibration of the speaker, 1 is the length of the bass reflex duct, and ρ is
the density of air.
[0049]
Thus, by appropriately selecting the above-mentioned WE, Bg, Vv, δ, Q or m and SS, SD, γ, l, 又
は or m1, m 2 of both the speakers 3c and 3d and the ducts 16L and 16R and 4g. It is possible to
select reaction forces that cancel each other -FD1 = FD1 and -FD2 = FD2 under various
conditions.
[0050]
In the configuration of the speaker apparatus shown in FIG. 3, the stiffnesses of the first to third
cavities 13, 14L and 14R are connected in parallel with each other in the electrical equivalent
circuit, and the equivalent mass of the ducts 16L and 16R and 4g are MD2, MD3 and MD1. Then,
they are connected in series with each other.
Also, since the mechanical resistance in the duct 4g is small, the equivalent mass connected in
series with the MD1 can be dumped by positively embedding the resistive material R0 such as
urethane home, and the force of -FD1 acting downward can be adjusted. It is.
[0051]
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11
FIG. 4 shows the top plate 1U at the duct 4g position shown in FIG. 3 with a sound emitting hole
19 provided with a speaker 20 to supply the same acoustic signal as the speakers 3c and 3d.
While enhancing the sound radiation force and increasing the reaction force in the -F3 direction,
the stabilization of the speaker box 1 in the direction of the bottom plate 1D is made stronger,
and the change in the stiffness SC1 in the first cavity 13 is coped with As a result, the second and
third stiffnesses SC2 and SC3 are made to respond promptly to changes, and the rise of the
lowest resonance frequency f0 of the speakers 3c and 3d is positively prevented.
[0052]
FIG. 5 shows still another embodiment of the speaker device according to the present invention,
and as in FIG. 4, the fourth cavity 21 is provided by a casing 22 surrounding the speaker 20
disposed on the top plate 1U. In this case, the reaction force supporting the speaker box 1
downward is W + (-F3) + (-FD1) + (-FD2). It turns out that it becomes more powerful.
[0053]
According to the speaker apparatus of the present invention, by arranging a pair of speakers or a
pair of ducts in front, rear, left and right, up and down directions of the speaker box at
symmetrical positions of the speaker box, the reaction force of the pair of speakers and The
reaction forces of the pair of ducts cancel each other out, and a speaker box can be obtained
which does not move up and down, left and right, and back and forth.
Furthermore, a pair of speakers is disposed in one speaker box, and the reaction force of the
sound radiation is collected at a predetermined point in the speaker box, and the entire speaker
box is converted to a reaction force directed downward (bottom plate) Thus, a compact and
lightweight speaker device can be stably mounted on the mounting portion.
[0054]
Brief description of the drawings
[0055]
1 is a cross-sectional view showing the principle configuration of the speaker device according to
the present invention.
04-05-2019
12
[0056]
2 is another cross-sectional view showing the basic configuration of the speaker device according
to the present invention.
[0057]
3 is a cross-sectional view of the speaker device according to the present invention.
[0058]
4 is another cross-sectional view of the speaker device according to the present invention.
[0059]
5 is yet another cross-sectional view of the speaker device according to the present invention.
[0060]
6 is a cross-sectional view of a conventional speaker device.
[0061]
Explanation of sign
[0062]
DESCRIPTION OF SYMBOLS 1 ... Speaker box, 1 U .... Top plate, 1 D .... Bottom plate, 1 L .... Left
side plate, 1 R .... Right side plate, 3 c, 3 d, 20 .. Speaker, 4 g, 4 h, 16 L, 16 R .... Duct, 12 L, 12R,
22 ... casing, 7a, 7b, 17 ... opening
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