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DESCRIPTION JPH11234780

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DESCRIPTION JPH11234780
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
small and light speaker device, and more particularly to an improvement of the speaker device
capable of expanding the sound pressure of the low sound of the speaker.
[0002]
2. Description of the Related Art Conventionally, as an effective means for extending the low
range reproduction limit of a speaker device, for example, an opening and a duct are provided in
a baffle plate provided with a speaker, and the phase of sound emitted from the back of the
diaphragm of the speaker is detected. It is well known that a bass reflex type (phase reversal
type) speaker device that inverts and radiates from the opening through the duct to intensify the
sound wave emitted to the front from the diaphragm of the speaker so as not to distort the bass
region. It is done.
[0003]
As shown in FIG. 6A, such a phase-reversal type speaker device fixes the speaker 3 so as to face
the speaker sound emission hole 2a formed in the baffle plate 2 provided on the front surface of
the speaker box 1.
[0004]
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1
For example, as shown in FIG. 6A, this speaker 3 is provided with a ring-shaped magnet 4 and a
plate 5 and a yoke 6 attached so as to sandwich the ring-shaped magnet 4. A magnetic air gap 7
is formed between the six center poles 6a.
Further, a frame 8 of the speaker 3 is attached to the plate 5, an edge 9 is provided on the outer
peripheral portion of the frame 8, and the outer peripheral portion of the cone-shaped
diaphragm 10 is held by the edge 9.
[0005]
On the other hand, a voice coil bobbin 11 is attached to the inner periphery of the diaphragm 10,
a voice coil 12 is wound around the voice coil bobbin 11, and the voice coil 12 is formed by the
plate 5 and the center pole 6a of the yoke 6. The magnetic gap 7 is inserted.
A damper 17 holds the voice coil 12 in the magnetic gap 7.
[0006]
Further, an acoustic signal from the input terminal 13a provided at a predetermined position
outside the speaker box 1 is supplied to the terminal 15 of the speaker 3 through the connection
line 14a, and an acoustic signal from the terminal 15 is voiced through the tinsel wire 16. The
coil 12 is supplied.
[0007]
In addition, a duct 18 having an opening 18a in the same plane as the speaker sound emission
hole 2a of the baffle plate 2 is provided, and the phase of the sound emitted from the back
surface of the diaphragm 10 of the speaker 3 is reversed. And radiate the sound out of the front
of the diaphragm 10 to a wide range.
[0008]
The electrical equivalent circuit in the phase inversion type speaker device as described above
can be represented as shown in FIG. 6 (B).
[0009]
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6A and 6B, S0 is the stiffness of the support system of the speaker 3, M0 is the equivalent mass
of the support system of the speaker 3, Rms0 is the mechanical resistance of the speaker support
system, and Rm0 is the air load of the speaker The mechanical resistance R0 is the equivalent
mechanical resistance of the speaker and can be expressed as Rm0 + Rms0 = R0.
SC is the stiffness in the speaker box 1, RD is the mechanical resistance of the air load of the duct
18 portion, and MD is the air mass of the duct 18 portion.
[0010]
As described above, by employing the phase-reversal type speaker device, the bass reproduction
limit can be lowered compared to the closed type, and the low-range reproduction range is
expanded to about 80% of the bass resonance frequency f0 of the speaker 3 It is supposed to be
possible.
[0011]
However, since the speaker box 1 is small and light in such a speaker device, the sound radiation
force F1 due to the vibration of the diaphragm 10 of the speaker 3 in FIG. 6A is equal to the
equivalent mass M0 of the speaker 3 The acceleration .alpha.0 which moves to s can be
expressed by F1 = M0 .alpha.0.
With respect to such sound radiation force F1, the reaction force -F1 directed from the back side
of the diaphragm 10 toward the inside of the speaker box 1 also becomes remarkable as the
volume of the speaker box 1 becomes smaller, and the speaker box is vibrated by the vibration of
the diaphragm 10. The air in 1 repeats compression and expansion, and this air acts as a force to
return the diaphragm 10 to the original position, causing the speaker box 1 to swing, and there
was a problem that the bass reproduction is inhibited. .
[0012]
In order to solve such a problem, the present applicant has previously proposed a speaker
apparatus as shown in FIG. 5, and in FIG. 5, the corresponding parts to FIG.
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3
[0013]
The speaker box 1 is formed of synthetic resin in a box shape integrally with the baffle plate 2.
The speaker 3 having the same configuration as that described in detail in FIG. 6A is fixed so as
to face the speaker sound emission hole 2 a formed on the upper side of the baffle plate 2.
The first duct 18 and the opening 18 a disposed on the lower side of the baffle plate 2 are
integrally molded when the baffle plate 2 is molded.
[0014]
In the upper part of the back plate 1B, a speaker sound emitting hole 2b is formed at a position
facing the speaker sound emitting hole 2a formed in the baffle plate 2, and the second speaker
3b, preferably the speaker 3 and the back face face each other. Similarly, the second duct 18b
fixed to the rear plate 1B to face the speaker sound emission hole 2b and having a larger duct
diameter than the first duct 18 is overlapped within a predetermined length of the first duct 18
And an integral mass of air which radiates to the opening 18a of the first duct 18 through the
opening 18c of the second duct 18b, and is integrally embedded with the rear face plate 1B so
that a concentric cross section is formed. It is configured to increase RD.
[0015]
Further, acoustic signals of the same input are supplied to the first and second speakers 3 and 3b
via the input terminals 13a and 13b disposed on the rear plate 1B and the connection lines 14a
and 14b.
[0016]
According to the loudspeaker system of FIG. 5 described above, the reaction forces -F1 and -F2 of
the radiation forces F1 and F2 of the first and second loudspeakers 3 and 3b and the first and
second The reaction force of the duct radiation force FD1 and FD2 / 2 + FD2 / 2 between the
ducts 18 and 18b-FD1 and -FD2 / 2 + (-FD2 / 2) can be mutually canceled if F1 .apprxeq.F2.
[0017]
However, the sound pressure at resonance radiated from the opening 18a of the first and second
ducts 18 and 18b is the sum of the sound pressure from the first and second two speakers 3 and
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3b, The sound pressure at the frequency above the resonance of the first and second ducts 18
and 18b is also the sum of the sound pressure radiated from the first and second speakers, and
the sound pressure above the sum of the sound pressures from the two speakers. Sound pressure
can not be radiated from the duct opening 18a.
[0018]
The present invention is intended to provide a speaker device capable of emitting bass with high
sensitivity by emitting the radiation force from the duct as the radiation force more than the sum
of the two speakers using two speakers.
[0019]
A speaker apparatus according to the present invention comprises first and second speakers
disposed in a first air chamber and a second air chamber provided in a speaker box, wherein the
first and second air chambers are provided. The first and second ducts are extended from the air
chamber of 2 to the opposite surfaces of the speaker box, duct openings are provided on the
respective opposite surfaces, the reaction force is supported by the speakers and the ducts, and
the speaker box is No swing, driving the first and second speakers in opposite directions and
providing a third air chamber on the front of the first speaker and a third duct communicating
with the second air chamber It is.
[0020]
According to the configuration of the speaker apparatus as described above, all the radiation
sound pressures before and after the diaphragms of the two first and second speakers are the
sum of the radiation sound pressures of the first and second ducts, A sound pressure equivalent
to that of using approximately four speakers is emitted from the duct, and one capable of
strongly emitting bass can be obtained.
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, one embodiment of the speaker
apparatus of the present invention will be described in detail with reference to FIGS.
FIG. 1 is a perspective view showing the appearance of the speaker device according to the
present invention, FIG. 2 is a cross-sectional view along arrows B-B 'along the plane AA' in FIG.
An electrical equivalent circuit schematic is shown.
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In FIG. 1 to FIG. 3, the same parts as in FIG. 5 and FIG.
[0022]
In FIG. 1 and FIG. 2, the speaker box 1 is formed in a substantially box shape of synthetic resin
such as ABS.
The speaker box 1 of this embodiment is not rectangular as in the configuration shown in FIGS. 5
and 6, and two steps of first and second stepped portions 34 and 35 are formed on the top plate
1U.
[0023]
That is, the first stepped portion 34 is formed in the upper portion of the baffle plate 2, and the
speaker mounting plate 36 disposed so as to hang downward from the deep portion of the
stepped portion 34 is the first configuration of FIG. The speaker 3 is attached, and the speaker
sound emission hole 2a is pierced.
The speaker mounting plate 36 is extended to the left and right side plates 1 L and 1 R of the
speaker box 1, and a third air chamber 39 described later is formed between the speaker
mounting plate 36 and the baffle plate 2.
[0024]
From the back of the second step 35 provided on the top plate 1U, the partition 31 for
partitioning the second air chamber 37 having a large volume in the speaker box 1 to form the
first air chamber 38 is made downward. The partition wall 31 extends from a predetermined
position to the partition plate 31 at right angles to the baffle plate 2 direction, and the front
surface of the partition wall 31 having an L-shaped cross section is integrated with the inside of
the baffle plate 2.
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Of course, this partition wall 31 is extended to the inside of the left and right side plates 1L and
1R of the speaker box 1 to form a first air chamber 38.
In the partition 31 in the vertical direction, a speaker sound emission hole 40 for the second
speaker 3 b is formed at a position facing the speaker sound emission hole 2 a of the first
speaker 3.
[0025]
Furthermore, the diaphragm 10 of the second speaker 3 b having a larger allowable input than
the first speaker 3 is attached to the partition wall 31 so as to face the speaker sound emission
hole 40.
Of course, this speaker may have the same configuration as described in FIG. 6, but as shown in
FIG. 2, a ring-shaped acoustic impedance load ring 33 formed of ABS resin or the like is disposed
between the inner diameters of the yoke 6 and the magnet 4. The speakers 3 and 3b are
configured to shift the low band lowest resonance frequency to the low band side and to cut the
high frequency.
[0026]
The lower center of the baffle plate 2 is pierced with an opening 18a of an L-shaped first duct 18
which protrudes into the second air chamber 38 through the horizontal partition 31 of the first
air chamber 38. ing.
[0027]
Further, a second duct 18b extended in the second air chamber 37 is erected at an opening 41
made in the lower center of the rear face plate 1B of the speaker box.
[0028]
Further, a third duct 32 for communicating the air in the third air chamber 39 into the second air
chamber 37 is penetrated from the third air chamber 39 into the second air chamber 37.
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In this example, a duct having a rectangular cross section is shown as the third duct 32. Of
course, a cylindrical shape may be used, and a mass load is applied to the front surface of the
first speaker 3 as the first speaker 3 Even if a speaker with a small allowable input is used, the
lowest resonance frequency of the speaker can be shifted to the low band by the duct mass load
MD2, and by resonating with the third duct 32 in the low band, the first speaker 3 is sufficient
with a small speaker It is.
[0029]
As shown in FIG. 2, the acoustic signals supplied to the input terminals 13a and 13b are inverted
by the first and second speakers 3 and 3b in which the diaphragm 10 is made to face in the
direction of the baffle plate 2, or the voice coil winding direction To drive the diaphragm 10 of
the first speaker 3 in the F1 direction while driving the diaphragm 10 of the second speaker 3b
in the F2 direction. Pressure, and the pressure fluctuation of the sound pressure is increased.
[0030]
The electrical equivalent circuit in the above configuration is the stiffnesses S1 and S2 of the
support system of the first speaker 3 and the second speaker 3b, the equivalent masses of similar
speakers M1 and M2, the equivalent mechanical resistance and air of similar speakers Equivalent
mechanical resistances including mechanical resistances R1 and R2, and stiffnesses in the first to
third air chambers 38, 37, 39 of the speaker box 1 respectively SC1, SC2, SC3, first to third ducts
18, 18b and 32 equivalent masses MD1, MD2 and MD3, similar duct mechanical resistances
RD1, RD2 and RD3, similar ducts air equivalent equivalent masses MDE1, MDE2, MDE3, first and
second The electrical equivalent circuit when the driving forces of the speakers 3 and 3b are
FVO1 and FVO2 can be represented by the circuit diagram shown by the solid line in FIG.
[0031]
The operation in the above configuration will be described below.
When the first speaker 3 is driven by the sound radiation force of F1 = M1 α1 (α1 is the
acceleration of the diaphragm 10 of the first speaker 3), the second speaker 3 b is F2 = M2 α2
(α2 is the second In the present example, the duct radiation force and duct radiation of the first
to third ducts are basically driven when the sound radiation force of the speaker 10b of the
speaker 3b is driven in the opposite direction to the radiation force F1. Since the force reaction
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forces cancel each other out, the radiation forces F1 and F2 of the first speaker 3 and the second
speaker 3b may be selected to be substantially equal.
[0032]
Further, the radiation force and reaction force of the first and second speakers 3 and 3b and the
first to third ducts 18, 18b and 32 are F1, -F1 and F2, -F2 and FD1, -FD1, FD2,-respectively. The
first and second speakers 3 and 3 when FD2, FD3 and -FD3 are used, the frictional resistance
between the bottom plate 1D of the speaker box 1 and the fixing portion such as the mounting
portion is R, and the self weight of the speaker device 30 is m. The conditions for the first and
second ducts 18 and 18b including the third and third ducts 32 to support each other and
preventing the light speaker box 1 from swinging can be obtained by equation (1).
F1 + FD2 = F2 + FD3 + FD1 + (F1 + FD3) R-(F2 + FD3 + FD1) R + (m + FD1 + FD3) R (1)
[0033]
When the first speaker 3 and the second speaker 3b described above are driven in the reverse
direction, the diaphragm 10 of the first speaker 3 is driven in the F1 direction, and the third air
chamber 39 is compressed and compressed. The air in the air chamber 39 is radiated through
the third duct 32 into the second air chamber 37 as the duct radiation force FD3.
At this time, since the equivalent mass MD3 of the third duct 32 is added in series to the
equivalent mass M1 of the vibration system of the first speaker 3, the lowest resonance
frequency of the first speaker 3 can be lowered.
In this case, since the resonance sharpness (θ) at the lowest resonance frequency is large, it is
possible to select a speaker having a smaller allowable input than the second speaker on the rear
surface.
[0034]
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Further, the air in the second air chamber 37 compresses the air in the second air chamber 37 by
the second speaker 3b by the speaker radiation force F2 in the same direction as the direction of
the duct radiation force FD3 described above. Also, at this time, the air in the first air chamber 38
exerts reaction forces -F1 and -F2 opposite to the radiation forces F1 and F2, but both reaction
forces cancel each other and become substantially zero. As air in the first air chamber 38
expands, air outside the opening 18 a of the first duct 18 is drawn into the first air chamber 38.
Therefore, the speaker box 1 is moved in the direction of the duct radiation force FD1, but it is
offset with -FD1.
[0035]
However, since the air in the first air chamber 38 expands, the diaphragms 10 and 10 of the first
and second speakers 3 and 3b exert force in the directions of F1 and F2, respectively, and the
second duct 18b Because the pressure of the first, second and third air is added and emitted
through the opening 41 of the second embodiment, the radiation sound pressure from the
opening 41 of the duct is approximately four speakers above the radiation output of the two
speakers. As a result, the radiation pressure of the air can be emitted, and a heavier bass can be
emitted.
[0036]
In contrast to the above, when the first and second speakers 3 and 3b are driven by -F1 and -F2,
the inside of the third air chamber 39 provided in the front stage of the first speaker 3 is
expanded. The air in the second air chamber 37 is sucked through the third duct 32 and works in
the direction of −F 1 in the direction to compress the diaphragm 10 of the first speaker 3 in the
first air chamber 38. The air in the second air chamber 37 expands and acts as a force to move
the diaphragm 10 of the second speaker 3b in the -F2 direction.
[0037]
Furthermore, since the air in the first air chamber 38 is compressed, the air in the first air
chamber 38 is radiated to the outside of the speaker box 1 through the opening 18 a through the
first duct 18.
Therefore, also in this case, the pressures of the air in the first to third air chambers 38, 37, 39
add to each other, and the sound pressure higher than the addition sound pressure of the two
speakers from the opening 18a of the first duct 18 What can be emitted is obtained.
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[0038]
In the above configuration, one first and second ducts 18 and 18b are provided on the baffle
plate 2 and the rear face plate 1B, but two first and second ducts are disposed as shown in FIG. It
is also good.
[0039]
FIG. 4 shows another configuration of the above-mentioned speaker device, and the first
rectangular ducts 18L and 18R to be penetrated from the third air chamber 39 into the second
air chamber 37 are baffle plates of the speaker box 1 Arranged along the left and right sides of
the two and along the front of the left and right side plates 1L and 1R, and as shown by oblique
lines, pierce rectangular openings 18aL and 18aR on the left and right of the baffle plate 2; The
second rectangular ducts 18bL and 18bR are extended downward along the left and right side
plates 1L and 1R into the second air chamber, and openings 41L and 41R as shown by hatching
are formed on the left and right of the rear plate 1B. That's the case.
[0040]
The openings 18aL and 18aR and 41L and 41R described above are not the baffle plate 2 and
the back plate 1B, but are pierced like the openings 18aL 'and 18aR' and 41L 'and 41R' before
and behind the left and right side plates 1L and 1R of the speaker box 1. The low frequency may
be emitted from the left and right side plates of the speaker box 1.
[0041]
In the configuration shown in FIG. 4 described above, the electrical equivalent circuit is the
radiation mass MDE1 'and MDE2' of the second duct of each of the first and second ducts and
the radiation resistance RD1 'and The series resistance of the mass and resistance of RD2 'is
connected in parallel to the mass and resistance series resistances of the radiation resistances
MDE1 and MDE2 of the first duct and the radiation resistances RD1 and RD2.
[0042]
According to the configuration of the present invention, since the first to third air chambers are
provided to drive the first and second speakers in opposite directions, from the first and second
ducts The radiation pressure of the speakers is equal to the radiation pressure of the two
speakers or more, and the same radiation sound pressure can be obtained.
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Furthermore, since the third duct is provided on the front of the first speaker and the equivalent
mass is added, the lowest resonance frequency of the first speaker can be lowered, so the first
speaker can be a speaker with a small allowable input. .
It is also possible to increase the sound pressure further by matching the resonant frequencies of
the two ducts.
Moreover, since it is the sound radiation from a duct, a large area is cut and the effect at the time
of using as a super wooha is large.
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