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JPH11178083

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPH11178083
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker apparatus suitable for application to a small and light speaker apparatus.
[0002]
2. Description of the Related Art Heretofore, as shown in FIG. 3 has been proposed as a small and
light speaker device. In FIG. 3, reference numeral 1 denotes a small-sized lightweight speaker box
made of synthetic resin or the like, and the speaker unit 3 is fixed to a speaker mounting hole 2 a
which is formed on the upper side of the baffle plate 2 fixed to the front surface of the speaker
box 1.
[0003]
The speaker unit 3 is configured, for example, as follows. As shown in FIG. 3, a ring-shaped
magnet 4 and a plate 5 and a yoke 6 mounted so as to sandwich the ring-shaped magnet 4 are
provided. A magnetic field is formed between the inner peripheral side of the plate 5 and the
center pole 6a of the yoke 6. The air gap 7 is formed. A speaker frame 8 is attached to the plate
5, and an edge 9 is provided on the outer peripheral portion of the frame 8. The outer peripheral
portion of the cone-shaped diaphragm 10 is held by the edge 9.
03-05-2019
1
[0004]
On the other hand, a voice coil bobbin 11 is attached to the inner peripheral portion of the
diaphragm 10. A voice coil 12 is wound around the voice coil bobbin 11. 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.
[0005]
Further, an audio signal from the input terminal 13 provided at a predetermined position outside
the speaker box 1 is supplied to the terminal 15 of the speaker unit 3 through the connection
line 14, and the audio signal from the terminal 15 is It is supplied to the voice coil 12 via
[0006]
Further, a duct 18 for bass reflex having an opening 18a in the same plane as the speaker
mounting 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 loudspeaker unit 3 is reversed. The sound is emitted to
the outside of the speaker box 1 to widen the low range of the sound coming out of the front
surface of the diaphragm 10.
[0007]
By the way, when the diaphragm 10 vibrates because the speaker unit 3 emits a sound, a force of
this vibration, ie, an action force is generated, and the force F of this action is It is the product of
the effective mass m 0 of the vibration system and the moving acceleration α of this vibration
system.
[0008]
Generally, when an object moves, the relation between action and reaction (action force and
reaction force have the same magnitude but opposite directions.
When the diaphragm 10 of the speaker unit 3 vibrates, the speaker box 1 receives the reaction
force.
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[0009]
In this case, when the speaker box 1 is lightweight, the speaker box 1 moves, the power of the
sound radiation of the speaker unit 3 is lost, the power of the sound radiation becomes weak, and
the sound quality is deteriorated.
[0010]
In view of the foregoing, it is an object of the present invention to enhance the power of sound
radiation and to improve the sound quality without losing the power of the sound radiation.
[0011]
The speaker apparatus according to the present invention divides a speaker box into a front box
and a rear box, and provides a first speaker unit on a front plate of the front box and a first
speaker unit on the rear plate of the rear box. A second speaker unit emitting sound in the
opposite direction to the first speaker unit is provided, and a first duct connecting the front box
and the rear box is provided, and sound is generated in front of the front box and the rear box
The second and third ducts for radiating are provided.
[0012]
According to the present invention, since the reaction forces due to the vibration of the
diaphragms of the first and second speaker units can be supported each other, the speaker box is
very strongly supported so as not to move in the front-rear direction. The low frequency sound is
very good and powerful because the speaker box does not move, and the sound quality can be
improved.
[0013]
Further, when the speaker device according to the present invention is used for bass, the rear
surface of the speaker box is used in contact with the wall or in contact with the floor.
At this time, even if sound is emitted to the front from the second and third ducts, the reaction
force of this radiation can be supported by the wall or floor, and a very strong bass can be
radiated, and the sound quality is improved and the bass The reproduction band can be
expanded.
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[0014]
Further, according to the present invention, since the first duct communicating the front box and
the rear box is provided, the flow of air in the first duct is performed by the first and the second
air conditioners provided in the front box and the rear box, respectively. Flow in any direction
due to the difference in the lowest resonance frequency of the speaker unit 2 and the difference
in pressure in the front and rear boxes by setting the resonance frequency of the second and
third ducts respectively attached, the front and rear surfaces The first and second speaker units
of the box can be loaded to lower the lowest resonant frequency, and the bass reproduction band
can be expanded.
[0015]
Furthermore, according to the present invention, since the speaker box is divided into the front
and rear boxes into two, the volume of each box is small, so the diaphragm of the speaker unit is
at a frequency lower than the resonance frequency of the duct. The amplitude of the speaker unit
decreases, the damper contact of the speaker unit decreases, the allowable input of the speaker
device increases, and loud noise can be emitted.
[0016]
Further, in the present invention, the resonance frequency of the first and second speaker units
becomes large by bringing the resonance frequency of the first duct connecting the front and
back surface boxes close to the lowest resonance frequency of the first and second speaker units.
The sensitivity rises.
[0017]
The speaker apparatus according to the present invention divides the speaker box into a front
box and a rear box, and provides a first speaker unit on the front plate of the front box and a
reverse of the first speaker unit on the rear plate of the rear box. A second speaker unit emitting
a sound in a direction, a first duct communicating the front box with the rear box, and a second
duct emitting a sound to the front of the front box and the front box A rear face is provided with
a third duct for emitting sound.
[0018]
According to the present invention, it is possible to mutually support the reaction forces due to
the vibration of the diaphragms of the first and second speaker units and to mutually support the
reaction forces of the sound radiation of the second and third ducts. Because it can fit, this
speaker box can be supported very strongly so as not to move in the front and back direction,
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and the low frequency sound becomes very good and strong because the speaker box does not
move, and the sound quality is improved be able to.
[0019]
Further, according to the present invention, since the first duct communicating the front box and
the rear box is provided, a load is applied to the second speaker unit of the rear box, and the
lowest resonance frequency can be lowered. The reproduction band can be expanded.
[0020]
Furthermore, according to the present invention, since the speaker box is divided into two into
the front and rear boxes, the volume of each box is small, so that the diaphragm of the speaker
unit is at a frequency lower than the resonance frequency of the very low duct. The amplitude is
reduced, the damper contact of the speaker unit is reduced, the allowable input of the speaker
device is increased, and a loud sound can be emitted.
[0021]
Further, in the present invention, the resonance frequency of the first and second speaker units
becomes large by bringing the resonance frequency of the first duct connecting the front and
back surface boxes close to the lowest resonance frequency of the first and second speaker units.
The sensitivity rises.
[0022]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the speaker
apparatus according to the present invention will be described below with reference to FIG.
In FIG. 1, parts corresponding to FIG. 3 are given the same reference numerals.
[0023]
In the example of FIG. 1, the small and light speaker box 1 made of synthetic resin or the like is
divided into two by a partition plate 20 into a front box 1 a and a rear box 1 b.
[0024]
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A speaker mounting hole 2a is formed on the front plate of the front box 1a, that is, the upper
side of the baffle plate 2, and the speaker unit 3a is fixed inside the speaker mounting hole 2a of
the baffle plate 2.
Further, a speaker mounting hole 19a is formed on the upper side of the rear face plate of the
rear face box 1b, ie, the baffle plate 19, and the sound is radiated inside the speaker mounting
hole 19a of the baffle plate 19 in the opposite direction to the speaker unit 3a. Fix the unit 3b.
[0025]
The same speaker units 3a and 3b are used, and the speaker units 3a and 3b are configured as
shown in FIG. 1, for example.
That is, a ring-shaped magnet 4 and a plate 5 and a yoke 6 attached so as to sandwich the ringshaped magnet 4 are provided to constitute a magnetic circuit, and the inner peripheral side of
the plate 5 and the center pole 6a of the yoke 6 To form a magnetic air gap 7.
[0026]
Further, a funnel-shaped frame 8 made of steel or the like of a speaker is attached to the plate 5,
and an edge 9 is provided on an outer peripheral portion of the frame 8. The outer peripheral
portion of the cone-shaped diaphragm 10 is formed by the edge 9 It is held.
[0027]
On the other hand, a voice coil bobbin 11 is attached to the inner peripheral portion of the
diaphragm 10. A voice coil 12 is wound around the voice coil bobbin 11. 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.
The voice coil 12 is held by the damper 17 in the magnetic gap 7.
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[0028]
Further, the same audio signal is supplied from the input terminal 13 provided at a
predetermined position outside the speaker box 1 to the respective terminals 15 of the speaker
units 3a and 3b via the connection lines 14a and 14b, and the audio is transmitted from this
terminal 15 A signal is supplied to the voice coil 12 through the tinsel wire 16.
[0029]
In this example, a cylindrical body 21 having both ends is provided extending through the
partition plate 20 between the front box 1a and the rear box 1b and extending into the rear box
1b communicating the front box 1a and the rear box 1b. The duct 22 is constituted by the
cylindrical body 21.
[0030]
In the present embodiment, a tubular member 23 having an opening 24a at the lower side of the
speaker unit 3a of the front baffle plate 2 of the front box 1a is parallel to the speaker unit 3a in
the front box 1a, that is, the inner surface of the front baffle plate 2 Set in the orthogonal
direction to
[0031]
Corresponding to the cylindrical body 23, the cylindrical body 25 is surrounded by the partition
plate 20 at a predetermined distance from the rear end 23a of the cylindrical body 23 to the
substantially central portion in the front direction. And the ducts 24 for emitting sound forward
from the front box 1 a by the cylindrical bodies 23 and 25.
[0032]
That is, the sound from the back surface of the diaphragm 10 of the speaker unit 3a is inverted
in phase from the front surface box 1a → the front end 25a of the cylindrical body 25
constituting the duct 24 → the rear end 23a of the cylindrical body 23 → the opening 24a It
radiates out of the speaker box 1.
[0033]
Further, in the present embodiment, a cylindrical body 27 having the same diameter as the
cylindrical body 23 having the opening 27a is provided concentrically with the cylindrical bodies
23 and 25 on the partition plate 20 at the bottom of the cylindrical body 25 in the rear surface
box 1b. The duct 26 is configured by the tubular body 27 and the tubular body 23 described
above.
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[0034]
In this case, the sound from the rear surface of the diaphragm 10 of the speaker unit 3b is from
the rear surface box 1b to the rear end port 27b of the cylindrical body 27 constituting the duct
26 → the opening 27a of the cylindrical body 27 → the rear end port 23a of the cylindrical body
23. → The phase is inverted through the opening 24 a and radiated out of the speaker box 1.
[0035]
Thus, according to the present embodiment, if the reaction forces Fa and Fb due to the vibration
of the speaker units 3a and 3b are used, the reaction forces Fa and Fb can be supported by each
other, so the speaker box 1 can Since the speaker box 1 does not move, the low frequency sound
is very good and strong, and the sound quality can be improved.
[0036]
In addition, when the speaker device according to the present embodiment is used for bass, the
rear surface of the speaker box 1 is in contact with a wall or in contact with a floor.
At this time, even if sound is emitted from the ducts 24 and 26 to the front, the reaction force of
this radiation can be supported by this wall or floor, a very strong bass can be radiated, the
sound quality is improved, and the bass reproduction band Can be expanded.
[0037]
In this case, the resonance frequency f1 when the duct 24 constituting the bass reflex is added to
the front box 1a.
Here, S0 is the stiffness of the support system of the diaphragm 10 of the speaker unit 3a, SC1 is
the stiffness of the air of the front box 1a, m0 is the effective mass of the vibration system of the
loudspeaker unit 3a, m2 is the mass of the air of the duct 24 .
[0038]
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The resonance frequency f2 is obtained when the duct 26 constituting the bass reflex is added to
the rear face box 1b.
Here, S0 is the stiffness of the support system of the diaphragm 10 of the speaker unit 3b, SC2 is
the stiffness of the air of the rear face box 1b, m0 is the effective mass of the vibration system of
the loudspeaker unit 3b, and m3 is the mass of the air of the duct 26. .
[0039]
The reproduction frequency band of the bass can be expanded by the resonance frequencies f1
and f2.
[0040]
Further, according to the present embodiment, since the duct 22 communicating the front box 1a
and the rear box 1b is provided, the flow of air in the duct 22 can be realized by the speaker unit
3a and the speaker unit 3a provided in the front box 1a and the rear box 1b respectively. Flow in
any direction due to the difference of the lowest resonance frequency of 3b and the difference of
the pressure in the front box 1a and the rear box 1b due to the setting of the resonance
frequency of the ducts 24 and 26 attached respectively, the front and rear boxes 1a and It is
possible to load each of the speaker units 3a and 3b of 1b to lower the lowest resonance
frequency, and to expand the bass reproduction band.
[0041]
That is, when this load is m, the lowest resonance frequency f0 of the speaker units 3a and 3b is.
In this case, the same speaker units 3a and 3b are used.
[0042]
Furthermore, according to the present embodiment, since the speaker box 1 is divided into the
front box 1a and the rear box 1b, the volume of each box 1a, 1b is small, so a frequency lower
than the resonance frequency of the very low duct In this case, the amplitude of the diaphragm
10 of the speaker units 3a and 3b is reduced, the contact of the dampers 17 of the speaker units
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3a and 3b is reduced, the allowable input of the speaker device is increased, and a large sound
can be emitted.
[0043]
Further, in this example, the resonance of the speaker units 3a and 3b is increased and the
sensitivity is enhanced by bringing the resonance frequency of the duct 22 communicating the
front box 1a and the rear box 1b close to the lowest resonance frequency f0 of the speaker units
3a and 3b. There is a profit.
[0044]
FIG. 2 shows another example of the embodiment of the present invention.
The parts corresponding to those of FIG. 1 will be denoted by the same reference numerals and
the detailed description thereof will be omitted.
[0045]
Also in this example of FIG. 2, the small-sized lightweight speaker box 1 made of synthetic resin
or the like is divided into two by the partition plate 20 into the front box 1 a and the rear box 1
b.
[0046]
A speaker mounting hole 2a is formed on the front plate of the front box 1a, that is, the upper
side of the baffle plate 2, and the speaker unit 3a is fixed inside the speaker mounting hole 2a of
the baffle plate 2.
Further, a speaker mounting hole 19a is formed on the upper surface of the rear face plate of the
rear face box 1b, ie, the baffle plate 19, and a sound is radiated inside the speaker mounting hole
19a of the baffle plate 19 in the opposite direction to the speaker unit 3a. , Fix the speaker unit
3b.
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[0047]
As the speaker units 3a and 3b, the same ones as in FIG. 1 are used.
Further, the same audio signal is supplied from the input terminal 13 provided at a
predetermined position outside the speaker box 1 to the respective terminals 15 of the speaker
units 3a and 3b via the connection lines 14a and 14b, and the audio signal from this terminal 15
Are supplied to the voice coil 12 through the tinsel wire 16.
[0048]
In this example, a cylindrical body 21 having both ends is provided extending through the
partition plate 20 between the front box 1a and the rear box 1b and extending into the rear box
1b communicating the front box 1a and the rear box 1b. The duct 22 is constituted by the
cylindrical body 21.
[0049]
In the present embodiment, a tubular member 23 having an opening 24a at the lower side of the
speaker unit 3a of the front baffle plate 2 of the front box 1a is parallel to the speaker unit 3a in
the front box 1a, that is, the inner surface of the front baffle plate 2 Set in the orthogonal
direction to
[0050]
Corresponding to the cylindrical body 23, the cylindrical body 25 is surrounded by the partition
plate 20 at a predetermined distance from the rear end 23a of the cylindrical body 23 to the
substantially central portion in the front direction. And concentrically form a duct 24 for emitting
sound from the front and rear boxes 1a and 1b to the front by the cylindrical bodies 23 and 25.
[0051]
That is, the sound from the back surface of the diaphragm 10 of the speaker unit 3a is inverted
in phase from the front surface box 1a → the front end 25a of the cylindrical body 25
constituting the duct 24 → the rear end 23a of the cylindrical body 23 → the opening 24a The
sound from the rear surface of the diaphragm 10 of the speaker unit 3b is radiated to the outside
of the speaker box 1, and the sound from the rear surface of the diaphragm 10 is back surface
box 1b → duct 22 → front surface box 1a → front end port 25a of the cylindrical body 25
constituting the duct 24 → cylinder The phase is inverted through the rear end opening 23a of
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the main body 23 through the opening 24a so as to be radiated out of the speaker box 1.
[0052]
Further, in this example, a cylinder which penetrates the rear face box 1b and has an opening
29b in the partition plate 20 at the bottom of the cylindrical body 25 and an opening 29a in the
lower side of the speaker unit 3b of the baffle plate 19 as the rear face plate. A cylindrical body
28 having the same diameter as the cylindrical body 23 is provided concentrically with the
cylindrical bodies 23 and 25, and this cylindrical body 28 constitutes a duct 29 for radiating the
sound from the front and rear face boxes 1a and 1b to the rear. It does like that.
[0053]
That is, the sound from the rear surface of the diaphragm 10 of the speaker unit 3a is inverted in
phase through the front box 1a → the front end 25a of the cylindrical body 25 → the duct 29
and radiated out of the speaker box 1 and the speaker unit 3b The sound from the back surface
of the diaphragm 10 is radiated to the outside of the speaker box 1 by reversing the phase
through the back surface box 1b → duct 22 → front surface box 1a → front end port 25a of the
cylindrical body 25 → duct 29.
[0054]
According to this example, assuming that the reaction forces Fa and Fb due to the vibration of
the diaphragm 10 of the speaker units 3a and 3b, and the reaction forces FD1 and FD2 for the
sound radiation of the ducts 24 and 29 be FD1 = FD2. Since the reaction forces Fa and Fb due to
the vibration of the diaphragm 10 of the speaker units 3a and 3b can be mutually supported, and
the sound radiation reaction forces FD1 and FD2 of the ducts 24 and 29 can be mutually
supported. This speaker box 1 can be very strongly supported so as not to move in the front and
back direction, and the low frequency sound becomes very good and strong because the speaker
box 1 does not move, and the sound quality can be improved. .
[0055]
Further, according to the present embodiment, since the duct 22 communicating the front box 1a
and the rear box 1b is provided, a load is applied to the speaker unit 3b of the rear box 1b by the
duct 22, and the lowest resonance frequency of the speaker unit 3b is determined. It can be
lowered and the bass reproduction band can be expanded.
[0056]
Furthermore, according to the present embodiment, since the speaker box 1 is divided into the
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front and rear boxes 1a and 1b, the volume of each box 1a and 1b is small. At the frequency, the
amplitude of the diaphragm 10 of the speaker units 3a and 3b is decreased, the allowable input
of the speaker device is increased, and a large sound can be emitted.
[0057]
Further, in the present embodiment, the resonance frequency of the speaker units 3a and 3b is
increased by bringing the resonance frequency of the duct 22 communicating the front and rear
surface boxes 1a and 1b close to the lowest resonance frequency f0 of the speaker units 3a and
3b. is there.
[0058]
If the speaker units 3a and 3b are positioned on the left and right with respect to the viewer, the
speaker device according to the present embodiment can be made into a high-sensitivity lowmidrange speaker device.
[0059]
Further, the speaker device according to the present embodiment is installed so as to face the
front box 1a with respect to the viewer, and if the front surface of the speaker unit 3a is front,
the speaker device can be expanded in low band in all bands. Can.
[0060]
The speaker units 3a and 3b are not limited to the above-described example, and various speaker
units such as a magnetically shielded speaker unit and a magnetically shielded speaker unit
provided with a shield cover can be used.
[0061]
Further, the present invention is not limited to the above-described example, and it goes without
saying that various other configurations can be adopted without departing from the scope of the
present invention.
[0062]
According to the present invention, the power of sound radiation can be made strong without
loss of the power of sound radiation, and the sound quality can be greatly improved even with a
small and light speaker device. There is a profit that can be done.
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[0063]
Brief description of the drawings
[0064]
1 is a cross-sectional view showing an example of an embodiment of the speaker apparatus of
the present invention.
[0065]
2 is a cross-sectional view showing another example of the embodiment of the present invention.
[0066]
3 is a cross-sectional view showing an example of a conventional speaker device.
[0067]
Explanation of sign
[0068]
1. Speaker box 1a Front box 1b Rear box 2. Front plate 3a, 3b Speaker unit 19. Rear plate 20
Partition plate 21, 23, 25 27, 28 .. Tubular body 22, 22, 26, 29. ... Duct
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