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JP2001136590

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DESCRIPTION JP2001136590
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker device and a sound reproduction device, and more particularly to a speaker device and a
sound reproduction device useful as a vehicle.
[0002]
2. Description of the Related Art With the spread of digital recording sources such as compact
discs, MDs, and DVDs, there is a need for an audio reproducing apparatus capable of sufficiently
reproducing these broadband sources. In particular, in order to improve the low frequency
reproduction capability even when the speaker device is miniaturized, conventionally, the low
frequency reproduction capability is improved by using a passive radiator type Kelton system in
which the speaker device is combined with a speaker unit and a passive radiator unit. An attempt
has been made.
[0003]
The following describes a conventional passive radiator type Kelton speaker device that improves
low-frequency reproduction capability even when the speaker device is miniaturized. FIG. 13 is
an exploded perspective view of a conventional passive radiator type Kelton speaker device. In
FIG. 13, reference numeral 1101 denotes a passive radiator unit that actually performs sound
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reproduction. A speaker unit 1102 drives a passive radiator unit. Reference numeral 1103
denotes a front baffle on which the passive radiator unit 1101 is attached and which constitutes
a part of the speaker box. Reference numeral 1104 denotes a front closed chamber that couples
the sound output of the speaker unit 1102 to the passive radiator unit 1101. Reference numeral
1105 denotes a sub baffle plate for attaching the speaker unit 1102 and spatially dividing the
front closed chamber 1104 and the rear closed chamber. 1106 is a cabinet which comprises a
speaker box.
[0004]
The operation of the conventional passive radiator type Kelton speaker device configured as
described above will be described below. As shown in FIG. 13, the sound reproduction output
radiated from the front of the speaker unit 1102 attached to the sub baffle plate 1105 that
spatially divides the front closed chamber 1104 and the rear closed chamber is the speaker unit
1102 or the front. Sound is reproduced from the passive radiator unit 1101 by driving the
passive radiator unit 1101 attached to the front baffle 1103 through the air in the front closed
chamber 1104 formed of the baffle 1103 and the sub baffle plate 1105. In addition, the back
surface sealing made up of the speaker unit 1102, the front baffle 1103, the sub baffle plate
1105, and the cabinet 1106 so that the sound reproduction output radiated from the back
surface of the speaker unit 1102 does not interfere with the sound reproduction output of the
passive radiator unit 1101. It is sealed by a room.
[0005]
FIG. 14 is an example of comparison of low-pass reproduction characteristics showing the
superiority of the conventional passive radiator type Kelton system. In FIG. 14, reference numeral
1201 denotes an output sound pressure frequency characteristic of the closed system. The
closed system is a system that avoids interference with the sound reproduction output on the
entire surface of the speaker unit by sealing the sound reproduction output on the back of the
speaker unit in the speaker box, but downsizing the speaker box reduces compliance with the
speaker unit. As a result, as can be seen from 1201 of FIG. Reference numeral 1202 denotes an
output sound pressure frequency characteristic of the phase inversion method using the same
type of speaker unit and speaker box. In the phase inversion method, the acoustic reproduction
output on the back of the speaker unit is resonated at a certain frequency (hereinafter referred to
as an antiresonance frequency) from the inside of the speaker box through the port and mixed
with the acoustic reproduction output on the front of the speaker unit. Since the sound
reproduction output via this port is in phase with the sound reproduction output of the speaker
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unit in the band above the antiresonance frequency, the interaction improves the radiation
efficiency and extends the low range reproduction limit compared to the closed system. Can.
However, the sound reproduction output via this port has an opposite phase to the sound
reproduction output of the speaker unit in the very low frequency band, and cancellation occurs.
For this reason, in a very low frequency band, a sharp attenuation curve of about -20 dB / oct is
obtained, and there is a drawback that sufficient deep bass reproduction can not be obtained.
Reference numeral 1203 denotes an output sound pressure frequency characteristic of the
conventional passive radiator type Kelton system using the speaker unit and the speaker box of
the same type. In the passive radiator type Kelton system, similar to the phase inversion system,
the passive radiator unit and the speaker unit can resonate at the respective sealed rooms in the
speaker box at a certain frequency to extend the low frequency reproduction limit. In addition,
since the system does not mix the acoustic reproduction output of the passive radiator unit and
the acoustic reproduction output of the speaker unit even in the ultra low range, the gradual
attenuation of about -12 dB / oct similar to the closed system even in the ultra low frequency
range It becomes a curve and sufficient deep bass reproduction can be obtained. In addition,
since the passive radiator diaphragm does not vibrate even if the speaker unit vibrates in a
frequency band above a specific frequency, it can also have excellent band-pass characteristics as
a low-range speaker reproducing device.
[0006]
As described above, the conventional passive radiator type Kelton system expands the low-range
reproduction limit which is an advantage of the deep bass reproduction ability due to the gentle
attenuation characteristics of the ultra-low range, which is an advantage of the closed system,
and the phase inversion method. Improve the reproduction ability of the low range by combining
the advantages of both methods.
[0007]
However, the speaker apparatus of the conventional passive radiator type Kelton system is very
effective as a means for improving the reproduction capability in the low range when the speaker
apparatus is miniaturized. As shown in the figure, due to the special structure in which the inside
of the speaker box is divided into two, front and rear closed chambers, by the sub-baffle plate,
the box structure becomes complicated and it is difficult to make the speaker unit thinner. There
is a problem that the heat dissipation characteristics are poor and the input resistance
performance is low because the storage is completely carried out.
[0008]
The present invention solves the problems of the above-described small speaker apparatus such
as the passive radiator type Kelton system speaker apparatus described above. The speaker unit,
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the passive radiator unit including the edge, the damper and the diaphragm are used as the front
baffles. In addition to the simple structure that forms the front closed chamber by attaching, it
aims to improve input resistance performance by thinning the speaker device and improving the
heat dissipation characteristics by exposing the plate portion of the speaker unit. I assume.
[0009]
SUMMARY OF THE INVENTION In order to solve this problem, a speaker apparatus according to
the present invention comprises a speaker unit to which an acoustic output signal of a power
amplifier is connected, a passive radiator unit comprising an edge, a damper and a diaphragm. A
front baffle having an opening for attaching the speaker unit and the passive radiator unit to
form a part of the speaker box and exposing a plate portion of the speaker unit, a cabinet
forming the speaker box, the speaker unit and the passive A front sealed chamber sealed by a
cushion attached to a radiator unit, the front baffle, and a magnet portion of the speaker unit,
and coupling an acoustic output on a rear surface of the speaker unit to the passive radiator unit;
A back sealed chamber sealed by a cover unit, the front baffle, and the cabinet and sealing an
acoustic output of a front surface of the speaker unit, wherein the speaker unit is disposed in an
inverted direction with respect to the passive radiator unit; The plate portion of the speaker unit
is exposed from the opening of the front baffle.
[0010]
According to this configuration, the speaker unit and the passive radiator unit including the edge,
the damper, and the diaphragm are attached to the front baffle to simplify the structure forming
the front sealed chamber and to expose the plate portion of the speaker unit. The input
resistance performance can be improved by thinning the speaker device and improving the heat
radiation characteristics.
[0011]
Further, even in the closed-type speaker device and the phase-reversal type speaker device, the
plate portion of the speaker unit is exposed, whereby the input performance can be improved by
thinning the speaker device and improving the heat dissipation characteristics.
[0012]
Further, when the above-mentioned speaker device is combined with a full-range speaker device,
an acoustic signal having a phase opposite to that of an acoustic signal to the full-range speaker
device is added. The phase relationship can be optimized when combining the above-mentioned
speaker devices that are acoustic outputs of opposite phase in plane.
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[0013]
The invention according to claim 1 of the present invention is a speaker unit to which an acoustic
output signal of a power amplifier is connected, a passive radiator unit comprising an edge, a
damper and a diaphragm, and the speaker unit. A front baffle having an opening for attaching
the passive radiator unit to form a part of the speaker box and exposing a plate portion of the
speaker unit, a cabinet constituting the speaker box, the speaker unit, the passive radiator unit,
and A front sealed chamber sealed by a cushion attached to a front baffle and a magnet portion
of the speaker unit and coupling an acoustic output on a rear surface of the speaker unit to the
passive radiator unit; the speaker unit and the freon A speaker device comprising: a back sealed
chamber sealed by a baffle and the cabinet and sealing an acoustic output of a front surface of
the speaker unit, wherein the speaker unit is disposed in an inverted direction with respect to the
passive radiator unit; In addition to the simple structure of forming the front sealed chamber by
attaching the passive radiator unit consisting of the edge, the damper and the diaphragm to the
front baffle, the thickness of the speaker device and the heat dissipation characteristics by
exposing the plate part of the speaker unit Has an effect of improving input resistance
performance.
[0014]
According to a second aspect of the present invention, a speaker unit to which a sound output
signal of a power amplifier is connected, a passive radiator unit including an edge, a damper and
a diaphragm, the speaker unit and the passive radiator unit are attached. A front baffle having an
opening that forms a part and exposes a plate portion of the speaker unit, a cabinet that
constitutes a speaker box, the speaker unit, the passive radiator unit, the front baffle, and a
magnet unit of the speaker unit A front sealed chamber sealed by a cushion and a sealing bracket
attached to the rear cover and coupling the acoustic output of the rear face of the speaker unit to
the passive radiator unit; the speaker unit and the front bar A speaker device including a back
sealed chamber sealed by a cabinet and a sealing bracket and sealing an acoustic output of a
front surface of the speaker unit, wherein the speaker unit is disposed in an inverted direction
with respect to the passive radiator unit; Even if the front sealed chamber can not be formed
simply by attaching the speaker unit and the passive radiator unit consisting of the edge, the
damper and the diaphragm to the front baffle with a small frame margin of the speaker unit, the
structure is simplified by using the sealing angle, Exposing the plate portion of the speaker unit
has an effect of improving input resistance performance by thinning the speaker device and
improving the heat dissipation characteristics.
[0015]
The invention according to claim 3 includes a speaker unit to which an acoustic output signal of
a power amplifier is connected, an opening for attaching the speaker unit to form a part of a
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speaker box, and exposing a plate portion of the speaker unit A front baffle having an opening
and a cabinet constituting a speaker box, the speaker unit and the front baffle seal the sound
output on the front of the speaker unit, and the sound output on the back of the speaker unit is
reproduced. It is a speaker device to be performed, and by exposing the plate portion of the
speaker unit to the upper side, it has an effect of improving input resistance performance by
thinning the speaker device and improving the heat radiation characteristic.
[0016]
The invention according to claim 4 forms a part of a speaker box by attaching a speaker unit to
which an acoustic output signal of a power amplifier is connected, a port for obtaining a phasereversed acoustic output, the speaker unit and the port. A front baffle having an opening for
exposing a plate portion of the speaker unit, an acoustic opening, and the port opening, and a
cabinet constituting a speaker box, and an audio output on the back of the speaker unit and the
port A speaker device that performs sound reproduction with sound output, and having the plate
portion of the speaker unit exposed upward, has an effect of improving input resistance
performance by thinning the speaker device and improving heat dissipation characteristics.
[0017]
The invention according to claim 5 is the speaker device according to any one of claims 1 to 4,
wherein the back surface of the plate portion of the speaker unit is provided with projections and
depressions which function as a heat sink. Have the effect of further improving
[0018]
The invention according to claim 6 is the speaker device according to any one of claims 1 to 4,
wherein a radiation fin is added to the back surface of the plate portion of the speaker unit, and
the heat radiation characteristic of the speaker device is further improved. It has an action.
[0019]
The invention according to claim 7 comprises: a differential amplifier provided at a stage
preceding the power amplifier; a microphone for detecting an acoustic output signal radiated
from a speaker unit or a passive radiator unit of the speaker device; and a signal detected by the
microphone Microphone amplifier for electrically amplifying, power amplification means for
connecting an output signal of the microphone amplifier to the differential amplifier to perform
acoustic feedback, and acoustic reproduction for reproducing an acoustic output signal of the
power amplification means by the speaker device It is an apparatus, It is an acoustic
reproduction apparatus using the speaker apparatus according to any one of claims 1 to 6 as the
speaker apparatus, and is an object when the speaker apparatus is miniaturized by acoustic
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feedback control using a microphone. The rise and fall of the speaker system. It has the effect of
improving the properties.
[0020]
The invention according to claim 8 comprises a combination of a full range speaker device to
which an acoustic signal is added and a low frequency sound reproducing device, and the low
frequency sound reproducing device has a phase opposite to that of the full range speaker
device. The sound reproducing device according to claim 7, wherein the sound reproducing
device is configured to add a related sound signal, and the sound reproduction device according
to claim 7 is the sound reproducing device according to claim 7, wherein the sound in antiphase
with the full range speaker device. When the low frequency range speaker device as an output is
combined, the phase relationship becomes optimum.
[0021]
Hereinafter, embodiments of the present invention will be described using FIGS. 1 to 12.
[0022]
(First Embodiment) FIGS. 1 and 2 show an exploded perspective view and a cross-sectional view
of a speaker device according to a first embodiment, and in FIG. 1 and FIG. 2, reference numeral
101 denotes a power amplifier for power amplifying an acoustic input signal.
Reference numeral 102 denotes a speaker unit to which the sound output signal of the power
amplifier 101 is connected.
103 is a passive radiator unit comprising an edge, a damper and a diaphragm.
A front baffle 104 has an opening 104 a for mounting the speaker unit 102 and the passive
radiator unit 103 and forming a part of the speaker box and exposing the plate portion 108 of
the speaker unit 102.
Reference numeral 105 denotes a cabinet constituting a speaker box, and 106 denotes a speaker
unit 102, a passive radiator unit 103, a front baffle 104, and a cushion 109a attached above the
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magnet portion 109 of the speaker unit 102. It is a front enclosure that couples the acoustic
output to the passive radiator unit 103.
Reference numeral 107 denotes a back sealed chamber which is sealed by the speaker unit 102,
the front baffle 104 and the cabinet 105 and seals the acoustic output of the front surface of the
speaker unit 102.
The speaker unit 102 is disposed in an inverted direction with respect to the passive radiator
unit 103, and constitutes a passive radiator type Kelton type speaker device.
[0023]
The operation of the loudspeaker apparatus of Embodiment 1 configured as described above will
be described below.
[0024]
In the speaker device according to the first embodiment shown in FIGS. 1 and 2, an acoustic
signal from the sound source device is amplified by the power amplifier 101.
The acoustic signal power-amplified by the power amplifier 101 is connected to the speaker unit
102 and converted into an acoustic output.
The sound output on the back of the speaker unit 102 is through the air in the front sealed
chamber 106 sealed by the speaker unit 102, the passive radiator unit 103, the front baffle 104,
and a cushion attached above the magnet portion 109 of the speaker unit 102. Can be
transmitted to the passive radiator unit 103 and the actual acoustic output can be obtained from
the passive By exposing the plate portion 108 of the unit 102, it is possible to improve input
resistance performance by thinning the speaker device and improving the heat dissipation
characteristics.
[0025]
Further, FIG. 12 shows the saturation temperature 1002 of the plate portion 108 of the speaker
unit 102 of the speaker device of the first embodiment and the saturation temperature 1001 of
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the plate portion of the speaker unit 1102 of the conventional passive radiator type Kelton
system speaker device. However, the conventional passive radiator type Kelton system speaker
device has a poor heat dissipation characteristic and a low input resistance performance because
the speaker unit is completely housed in the speaker device, but the speaker device according to
the first embodiment is the speaker unit By exposing the plate portion, it is possible to greatly
improve the heat dissipation characteristics of the speaker device and to improve the input
resistance performance.
[0026]
FIG. 3 shows an exploded perspective view of a modification of the speaker device of the first
embodiment.
The difference from the first embodiment is that a speaker unit 301 with a small frame margin is
used. In this case, the speaker unit 301 is attached to the front baffle 104 using a sealing angle
305.
Therefore, the acoustic output on the back of the speaker unit 301 is a front sealed chamber
sealed by the speaker unit 301, the passive radiator unit 103, the front baffle 104, the ceiling
angle 305, and a cushion attached above the magnet portion 309 of the speaker unit 301. The
actual acoustic output can be obtained from the passive radiator unit 103 via the air.
Even if the front sealed chamber can not be formed only by attaching the speaker unit 301 and
the passive radiator unit 103 consisting of the edge, the damper and the diaphragm to the front
baffle 104, the frame margin of the speaker unit 301 is small, as in this example. By using the
angle 305, the structure can be simplified, and by exposing the plate portion of the speaker unit
301, it is possible to improve input resistance performance by thinning the speaker device and
improving the heat dissipation characteristics.
[0027]
4 and 5 show an exploded perspective view and a cross-sectional view of a modification of the
speaker device of the first embodiment.
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The difference from the first embodiment is that a front baffle 402 without the passive radiator
unit 103 is used. In this case, the speaker unit 102 is attached to the front baffle 402 in the
reverse direction, and the front surface of the speaker unit 102 is The acoustic output is sealed
by the speaker unit 102, the front baffle 402, and the cabinet 403, and the acoustic output of the
rear surface of the speaker unit 102 is sealed by the cushion 109a attached above the magnet
109 of the speaker unit 102. Sound output is obtained via 402b.
Then, the plate portion 108 of the speaker unit 102 can be exposed from the opening 402 a of
the front baffle 402, and the input resistance can be improved by thinning the speaker device
and improving the heat dissipation characteristics.
[0028]
6 and 7 show an exploded perspective view and a cross-sectional view of a modification of the
speaker device of the first embodiment.
The difference from Embodiment 1 is that a front baffle 503 with a port 502 is used. In this case,
the speaker unit 102 is attached to the front baffle 503 in the reverse direction, and the acoustic
output of the front of the speaker unit 102 is a speaker The sound of the front baffle 503 which
is resonated by the unit 102, the front baffle 503, the cabinet 504 and the port 502, and a
resonant acoustic output can be obtained from this port 502, and at the same time the acoustic
output of the back of the speaker unit 102 is sealed by the cushion 109a. It is obtained through
the opening 503b.
The plate portion 108 of the speaker unit 102 can be exposed from the opening 503a of the
front baffle 503, and the input resistance can be improved by thinning the speaker device and
improving the heat dissipation characteristics.
[0029]
FIG. 8 shows a perspective view of a speaker unit according to a modification of the speaker
device of the first embodiment. The difference from the first embodiment is that the unevenness
601 acting as a heat sink is provided on the back of the plate portion 108 of the speaker unit
102. The unevenness 601 is exposed from the opening when assembled to the front baffle, and
the heat dissipation characteristics of the speaker device can be further improved.
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[0030]
FIG. 9 is a perspective view of a speaker unit according to a modification of the speaker device of
the first embodiment. A difference from the first embodiment is that a radiation fin 702 is added
to the back of the plate portion 108 of the speaker unit 102. At the time of assembly to the front
baffle, the heat radiation fins 702 are exposed from the opening, and the heat radiation
characteristics of the speaker device can be further improved.
[0031]
FIG. 10 shows a sound reproduction device to which the speaker device according to the first
embodiment is applied.
In FIG. 10, an acoustic output signal actually radiated from the speaker unit 102 or the passive
radiator unit 103 of the loudspeaker device 801 is picked up by the microphone 802, and an
acoustic input signal from a sound source device or the like is added via the microphone
amplifier 803. And amplified by the power amplification means 805 and supplied to the speaker
device 801.
As a result, acoustic feedback control is performed to perform correction according to the
ambient noise, which is advantageous as a low-range sound reproduction apparatus.
Therefore, the rise and fall characteristics of the speaker device can be improved while
suppressing the increase in the quality factor due to the miniaturization of the speaker device.
Here, as the speaker device, those shown in FIGS. 1 to 9 are used.
[0032]
FIG. 11 shows an application example of the low-range sound reproduction apparatus described
in FIG.
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In FIG. 11, an audio signal from a sound source device 903 composed of a sound source device
903a such as a compact disc player, a cassette player and a tuner, a voltage amplifier 903b and a
power amplifier 903c is supplied to a full range speaker device 902 that reproduces around
middle and high frequencies. Also, the low-range sound reproducing apparatus shown in FIG. 10
is supplied to the low-range sound reproducing apparatus 901. In this combination, an acoustic
signal having an antiphase relationship with the acoustic signal to be applied to the full range
speaker device 902 is applied to the audio reproduction device 901, whereby the full range
loudspeaker device 902 has an antiphase in structure. It is possible to optimize the phase
relationship with the sound reproduction device 901 using the speaker device according to the
first embodiment which is the sound output.
[0033]
As described above, according to the present invention, in the passive radiator type Kelton
speaker device, the front sealed chamber is mounted by attaching the speaker unit and the
passive radiator unit including the edge, the damper and the diaphragm to the front baffle. By
exposing the plate portion of the speaker unit in addition to the simple structure for forming the
input unit, it is possible to improve input resistance performance by thinning the speaker device
and improving the heat dissipation characteristics. Further, also in the closed-type speaker device
and the phase-reversal method speaker device, the plate portion of the speaker unit is exposed,
so that the input device can be improved in input resistance performance by thinning the speaker
device and improving the heat dissipation characteristics.
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